Hematopoietic aging is marked by declining regenerative capacity and a shift from lymphoid to myeloid output. Previous studies have focused primarily on hematopoietic stem cells (HSCs), yet whether aging uniformly remodels the hematopoietic stem and progenitor cell (HSPC)…
Abstract
Hematopoietic aging is marked by declining regenerative capacity and a shift from lymphoid to myeloid output. Previous studies have focused primarily on hematopoietic stem cells (HSCs), yet whether aging uniformly remodels the hematopoietic stem and progenitor cell (HSPC) compartment, or selectively affects distinct populations, remains largely unknown. To address this, we profile HSCs and multipotent progenitors MPP1-6 from young and aged mice across transcriptomic, epigenomic, metabolomic and lipidomic layers, together with single-cell division and in vivo serial transplantation assays. We identify young MPP6 (negative for CD150, CD34, CD48 and CD135) as an HSC-like, lymphoid-biased population with long-term reconstitution capacity, positioned within the top-tier of the differentiation hierarchy and marked by low global chromatin accessibility and metabolic activity. Upon aging, MPP6 preserved long-term lymphoid reconstitution, underwent limited transcriptional and regulatory remodeling, and did not accumulate polyunsaturated phospholipids or show mitochondrial oxidation. By contrast, most HSPCs, and particularly HSCs, underwent pronounced age-associated changes, including myeloid-biased expansion, metabolic rewiring, extensive distal regulatory alteration and accumulation of long-chain polyunsaturated phospholipids linked to increased oxidative stress. Pseudotime analysis further resolved the aged MPP6 compartment into two subsets, including a dormant, lymphoid-biased Dlk1-expressing population characterized by reduced mitochondrial activity, which was distinctly affected by inflammatory challenge in vivo. Together, these findings establish MPP6 as a comparatively resilient population within the aged HSPC compartment and suggest that it may represent a potential target for restoring hematopoietic balance.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper claims that the MPP6 multipotent progenitor population is uniquely resilient to age-associated remodeling compared to HSCs, preserving lymphoid reconstitution capacity. This is relevant to longevity research because it identifies a specific cellular compartment that retains regenerative potential in aged hematopoiesis, offering a mechanistic insight into why aging is not uniform across stem cell lineages and suggesting a potential target for restoring hematopoietic balance, though it remains a descriptive study in mice without direct interventions to extend lifespan.
The Mexican cavefish, Astyanax mexicanus, is a powerful evolutionary model for investigating how adaptation to extreme environments reshapes vertebrate physiology. Multiple cave populations have independently evolved under subterranean conditions, acquiring traits including…
Abstract
The Mexican cavefish, Astyanax mexicanus, is a powerful evolutionary model for investigating how adaptation to extreme environments reshapes vertebrate physiology. Multiple cave populations have independently evolved under subterranean conditions, acquiring traits including insulin resistance, persistent hyperglycaemia, increased adiposity, altered sleep patterns, hypoxia tolerance and extensive metabolic reprogramming. Despite these differences, cavefish exhibit lifespans comparable to those of surface fish, while selected traits, including fertility and locomotor performance, appear to be better preserved with age. These observations challenge the assumption that persistent metabolic dysfunction necessarily entails accelerated functional decline and raise the possibility that cavefish have evolved mechanisms of ageing resilience. This narrative review examines evidence linking cave adaptation to biological processes relevant to ageing, focusing on nutrient sensing, lipid metabolism, mitochondrial function, redox homeostasis and immune regulation. Rather than eliminating metabolic stress, cave-associated adaptations may buffer some of its downstream consequences, preserving selected physiological functions. Evidence is evaluated within the framework of the hallmarks of ageing, considering genomic instability, telomere dynamics, deregulated nutrient sensing, mitochondrial dysfunction and chronic inflammation, while identifying major knowledge gaps regarding epigenetic alterations, loss of proteostasis, macroautophagy, cellular senescence, stem-cell exhaustion, altered intercellular communication and dysbiosis. The available evidence supports A. mexicanus as a comparative model for investigating how chronic environmental and metabolic stress can be uncoupled from selected aspects of functional decline. Distinguishing delayed ageing from enhanced tolerance or compensation in response to accumulated damage will be essential to establish the extent and mechanisms of ageing resilience in this species.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper proposes that cavefish have evolved mechanisms of ageing resilience that buffer the downstream consequences of chronic metabolic stress, thereby preserving selected physiological functions despite persistent metabolic dysfunction. This is a narrative review that synthesizes existing evidence on a comparative model organism to explore the uncoupling of metabolic stress from functional decline, offering a conceptual framework for understanding ageing resilience rather than presenting new experimental data or a direct intervention strategy.
Stresses occurring transiently and early in life can have long-standing consequences for health, even long after the stress has resolved. Many environmental stressors converge on activating the integrated stress response (ISR), whose major effector is ATF4. However, it remains…
Abstract
Stresses occurring transiently and early in life can have long-standing consequences for health, even long after the stress has resolved. Many environmental stressors converge on activating the integrated stress response (ISR), whose major effector is ATF4. However, it remains unknown whether transient ATF4-ISR activation early in life is a mediator of life and healthspan. Here we used inducible, reversible ATF4 gain-of-function in Drosophila to determine how the timing, duration and tissue of ATF4 activation determine ageing outcomes. We found that ATF4 induction confined to early adulthood extended healthspan, reducing mortality risk by approximately 50% across all ages and improving neuromuscular function in aged flies. Multi-organ transcriptomics showed that the acute ATF4 transcriptional response was transient, as expected, but replaced by a distinct, secondary transcriptional programme of metabolic remodelling that was associated with decreased total body protein content. By using tissue-specific ATF4 induction, we found that transient ATF4 activation in neurons was sufficient to extend lifespan, slow age-related locomotor decline and increase starvation resistance in old age. This neuron-restricted activation prevented the costs to body weight and fecundity induced by ubiquitous ATF4 activation. Transient neuronal ATF4 left a lasting non-autonomous imprint on the fat body at old age: induction of heterochromatin genes, reduced transposable element expression, and increased mitochondrial respiratory capacity. These findings show that the duration and tissue of ISR-ATF4 activation are the key determinants of ATF4 actions that promote healthy ageing, while revealing a brain-to-fat body axis initiated by neuronal ATF4 that results in lasting systemic adaptation.
AI-generated longevity analysis. Check claims against the paper.
Summary
A transient pulse of neuronal ATF4 activation in early adulthood installs a durable, non-autonomous transcriptional and metabolic programme in the fat body that extends lifespan and healthspan. This is highly relevant because it identifies a specific, transient, and tissue-restricted intervention (neuronal ISR activation) that bypasses the typical metabolic costs of systemic stress responses to produce long-term systemic adaptation and healthy aging, offering a precise mechanistic target for longevity research.
Telomeric repeat-containing RNA (TERRA) has long been viewed as a constitutive component of telomeres. However, accumulating experimental evidence suggests that TERRA is instead a stress-responsive signal produced specifically at dysfunctional telomeres. Across yeasts and…
Abstract
Telomeric repeat-containing RNA (TERRA) has long been viewed as a constitutive component of telomeres. However, accumulating experimental evidence suggests that TERRA is instead a stress-responsive signal produced specifically at dysfunctional telomeres. Across yeasts and mammals, TERRA abundance changes as telomeres shorten or become damaged, engaging the appropriate maintenance pathway through interactions with shelterin, chromatin regulators and DNA repair factors, and through the controlled formation of RNA:DNA hybrids (R-loops). In telomerase-negative cells, transient accumulation of TERRA and R-loops promotes homology-directed telomere elongation. In telomerase-positive cells, TERRA appears to direct telomerase activity selectively toward short telomeres. When telomere damage remains unresolved, sustained TERRA expression and persistent R-loops drive cells toward senescence, inflammatory signaling and crisis-associated cell death. We propose here that TERRA functions as a molecular rheostat at damaged telomeres: transient and spatially controlled induction restores chromosome-end integrity, whereas persistent accumulation results in the removal of compromised cells from the proliferative pool. Defining how cells set these switch points will be essential for elucidating how TERRA shapes ageing and disease and for harnessing its therapeutic potential.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper proposes that TERRA functions as a molecular rheostat where transient induction restores telomere integrity while persistent accumulation drives senescence and cell death. This is relevant to longevity because it identifies a specific molecular mechanism governing the transition from cellular maintenance to aging-associated senescence, offering potential targets for intervening in the fundamental processes of cellular aging.
How progenitor cells couple their metabolic state to the regulation of fate and differentiation remains a fundamental question in tissue development and regeneration. Here, we identify a nutrient-responsive circuit that links progenitor anabolism to differentiation in the…
Abstract
How progenitor cells couple their metabolic state to the regulation of fate and differentiation remains a fundamental question in tissue development and regeneration. Here, we identify a nutrient-responsive circuit that links progenitor anabolism to differentiation in the Drosophila midgut. We show that the mTORC1 downstream effector PWP1 is necessary and sufficient for differentiation of intestinal stem cell progeny toward the absorptive lineage in fed animals. In progenitors with high mTORC1 activity, PWP1 controls gene expression to promote Hedgehog (Hh) signaling, which cell autonomously drives progenitor differentiation into enterocytes. This circuit is constrained by feedback regulation, as elevated Hh activity inhibits mTORC1 and consequently excludes PWP1 from the nucleus. Disruption of the mTORC1-PWP1-Hh axis causes a progressive failure of enterocyte turnover during aging and reduced lifespan. While the aged midguts retain their barrier function, defective renewal leads to aging-associated deregulation of intestinal metabolism. Collectively, these observations support the concept of growth-dependent licensing of differentiation, whereby the nutrient-responsive anabolic state of a progenitor cell controls its lineage progression, consequently enabling organ renewal.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper demonstrates that the mTORC1-PWP1-Hedgehog signaling axis is required for nutrient-responsive intestinal stem cell differentiation and that its disruption leads to reduced lifespan in Drosophila. This is relevant because it identifies a specific molecular mechanism linking nutrient sensing to tissue renewal and lifespan, providing a potential target for interventions aimed at maintaining organ homeostasis during aging.
Microbial diets and their metabolites can influence host aging, yet identifying geroprotective compounds from complex culture matrices remains challenging. Here, a diet supplemented with the human gut-derived Enterococcus faecium SI194 extended the mean lifespan of…
Abstract
Microbial diets and their metabolites can influence host aging, yet identifying geroprotective compounds from complex culture matrices remains challenging. Here, a diet supplemented with the human gut-derived Enterococcus faecium SI194 extended the mean lifespan of Caenorhabditis elegans by 23.24%, improved aging-associated phenotypes, and enhanced SKN-1-responsive signaling. No lifespan extension was detected in skn-1(zu67) mutants, consistent with the involvement of SKN-1. To prioritize metabolites for independent phenotypic evaluation, we integrated untargeted metabolomics with structure-based virtual screening against glycogen synthase kinase-3 (GSK-3), a negative regulator of SKN-1. Among 71 structurally annotated features enriched in the OP50-SI194 liquid-culture preparation, the feature annotated as obtusifolin had the most favorable Vina docking score. A single 100-ns molecular dynamics trajectory supported the conformational persistence of the modeled GSK-3-Obt complex under the simulated conditions. Exogenous obtusifolin (Obt; 30μM) extended mean lifespan by 14.55%, reduced DCFH-DA-derived fluorescence and age-associated intestinal autofluorescence, and increased gst-4p::GFP fluorescence. These findings support the geroprotective effects of the SI194-supplemented diet and exogenous Obt as distinct interventions and illustrate the workflow's utility for candidate prioritization. Future studies should clarify Obt's contribution to SI194-associated lifespan extension and its relationship with SKN-1 and GSK-3.
AI-generated longevity analysis. Check claims against the paper.
Summary
Obtusifolin, a metabolite identified via metabolomics-guided virtual screening, extends C. elegans lifespan by 14.55% through SKN-1-dependent pathways. This is a solid but incremental study that validates a specific workflow for identifying geroprotectors from microbial diets, offering a modest contribution to the field of dietary geroprotection without providing a novel mechanism or transformative breakthrough.
Iron accumulation is a conserved hallmark of cellular as well as organismal aging, yet its mechanistic role in senescence remains largely elusive. Here we show that the accumulation of ferrous iron (Fe
Abstract
Iron accumulation is a conserved hallmark of cellular as well as organismal aging, yet its mechanistic role in senescence remains largely elusive. Here we show that the accumulation of ferrous iron (Fe
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper demonstrates that lysosomal sequestration of ferrous iron, mediated by cholesterol shielding, drives cellular senescence while conferring resistance to ferroptosis. This work is highly relevant because it identifies a specific mechanistic link between a conserved hallmark of aging (iron accumulation) and the cellular state of senescence, offering a potential target for interventions aimed at delaying the functional decline associated with aging rather than merely treating downstream symptoms.
DNA methylation alterations are hallmark features of aging and cancer, occurring early during tumor initiation. Yet how these changes evolve during early tumorigenesis, and whether oncogenic signaling actively drives them, remains poorly understood due to limitations in…
Abstract
DNA methylation alterations are hallmark features of aging and cancer, occurring early during tumor initiation. Yet how these changes evolve during early tumorigenesis, and whether oncogenic signaling actively drives them, remains poorly understood due to limitations in resolving this at the longitudinal and clonal level. Here we developed a genome-wide DNA methylation profiling method for low DNA amounts and applied it to single stem cell-derived clones from a BRAFV600E -inducible mouse colon organoid model, tracking nucleotide-level methylation heterogeneity over time. BRAFV600E induction produced stepwise methylation divergence consistent with progressive clonal takeover, in contrast to gradual epigenetic drift in uninduced controls. Strikingly, while the specific CpG sites altered differed between BRAFV600E and control lineages, they converged on the same genomic elements. Particularly, Polycomb-marked promoter CpG-island methylation gains were not induced or accelerated by BRAFV600E, challenging models in which oncogenic signaling or cell proliferation actively instructs de novo methylation of Polycomb-targeted promoters. Instead, these gains tracked with "biological aging" independent of replication, which was validated across independent aging, cancer, and cell-line datasets. BRAFV600E -induced clones additionally showed progressive loss of intestinal lineage-specification transcription factor programs, consistent with selection for cells adapted to oncogenic stress. Together, these findings show that epigenetic trajectories during early tumor development, are rooted in baseline, age-dependent drivers of epigenetic alterations, and that oncogenic signaling acts primarily by selecting and expanding clones bearing pre-existing, age-associated epigenetic drift rather than instructing new methylation. Our findings have implications for how promoter methylation is interpreted as a cancer biomarker and for identifying upstream aging-associated processes as targets for early intervention.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper claims that Polycomb-marked promoter methylation gains in cancer are driven by baseline biological aging independent of replication or oncogenic signaling, rather than being actively instructed by tumor initiation. This is relevant to longevity research because it identifies a specific, replication-independent epigenetic mechanism as a root driver of age-associated genomic instability, suggesting that targeting these baseline aging processes could prevent the epigenetic drift that facilitates cancer initiation.
Why mitochondria progressively fail in aging neurons remains a fundamental question in neurobiology. Although bioenergetic decline and oxidative stress are hallmarks of aging, whether redox signaling remodels mitochondrial nucleoids (mt-nucleoids) to impair neuronal…
Abstract
Why mitochondria progressively fail in aging neurons remains a fundamental question in neurobiology. Although bioenergetic decline and oxidative stress are hallmarks of aging, whether redox signaling remodels mitochondrial nucleoids (mt-nucleoids) to impair neuronal bioenergetics remains unclear. Using aged mouse neurons and human induced pluripotent stem cell (iPSC)-derived neurons, we demonstrate that redox-driven mt-nucleoid remodeling underlies reduced mtDNA transcript abundance and bioenergetic decline. Combining minimal photon fluxes (MINFLUX) nanoscopy with single-molecule transcription mapping, we identify distinct mt-nucleoid architectures governed by mitochondrial transcription factor A (TFAM)-mediated mtDNA compaction. Aging-associated oxidative stress drives mt-nucleoid remodeling from compact, transcriptionally active structures toward decompacted forms with reduced mtDNA transcript abundance and impaired mitochondrial ATP production. This remodeling involves species-specific TFAM redox mechanisms: cysteine oxidation promotes human TFAM polymerization, whereas methionine oxidation weakens mouse TFAM-mtDNA interactions. Notably, expressing an oxidation-resistant TFAM variant restores mt-nucleoid organization, mtDNA transcript abundance, and ATP production in aged neurons, identifying mt-nucleoid architecture as a potential target for preserving neuronal bioenergetics during aging.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper claims that redox-driven remodeling of mitochondrial nucleoids, mediated by species-specific TFAM oxidation, causes bioenergetic decline in aging neurons and that restoring nucleoid architecture via oxidation-resistant TFAM can reverse this decline. This is relevant because it identifies a specific molecular mechanism (mt-nucleoid architecture) underlying a fundamental aspect of cellular aging (bioenergetic failure) and proposes a direct intervention to restore function, rather than merely treating downstream symptoms.
One influential proposal holds that DNA damage drives aging by degrading the epigenome, so that a cell loses the information that specifies what it is. We test that specific proposed driver, not the broader idea that aging involves a loss of epigenetic information…
Abstract
One influential proposal holds that DNA damage drives aging by degrading the epigenome, so that a cell loses the information that specifies what it is. We test that specific proposed driver, not the broader idea that aging involves a loss of epigenetic information. Cell-type-unique CpGs are a direct place to test it. They are the sites where a cell's methylome differs most from every other cell type, so they are where its identity information can be accurately measured. We built such a panel for human skin fibroblasts against twenty primary cell types, and found that most of its 9,150 CpGs behave as a record of proliferation rather than identity. Their methylation state in fibroblasts is shared with continuously proliferating cell lines, consistent with the bulk hypomethylation of late-replicating chromatin that accumulates in culture, and this layer must be separated from identity marks before identity loss can be tested. We then expressed every perturbation as the fraction of the panel's identity information lost beyond baseline-matched background CpGs, using a Bernoulli cross-entropy between the fibroblast code and a generic comparator cell. In 24 matched fibroblast cultures, replicative exhaustion cost 24.3% of the identity information (95% CI 20.2 to 28.7) and RAS activation cost 5.4% (4.6 to 6.1), both at p = 1.2 X 10^-7;. A senescence-inducing dose of X-rays cost nothing: -0.5% (-0.7 to -0.2), with identity CpGs if anything moving slightly further from other cell types than matched background did. The design could detect a loss of 0.4%, about one sixtieth of the exhaustion effect, so the X-ray result is a bounded negative rather than an absence of power. Doxorubicin-induced and irradiation-induced senescence did not move the panel either. Clones that kept dividing after irradiation moved further from other cell types rather than collapsing toward them. In human fibroblasts, loss of identity information tracks prolonged division, not acute DNA damage.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper claims that the loss of cell-identity DNA methylation in human fibroblasts is driven by replicative exhaustion (division history) rather than acute DNA damage. This is relevant to longevity research because it challenges a specific mechanistic model of aging (that DNA damage directly degrades the epigenome) and identifies proliferation history as the primary driver of epigenetic identity loss, which has implications for understanding the limits of cellular rejuvenation and the role of cell turnover in aging.
Atp12 is known as a chaperone for mitochondrial ATP synthase assembly, yet its functions and mechanisms in regulating mitochondrial and cellular aging remain elusive. In this study, we demonstrate that Atp12 plays a critical role in regulating mitochondrial dynamics and…
Abstract
Atp12 is known as a chaperone for mitochondrial ATP synthase assembly, yet its functions and mechanisms in regulating mitochondrial and cellular aging remain elusive. In this study, we demonstrate that Atp12 plays a critical role in regulating mitochondrial dynamics and chronological lifespan (CLS) in the fission yeast
AI-generated longevity analysis. Check claims against the paper.
Summary
Atp12 regulates mitochondrial fusion and chronological lifespan in fission yeast through the interaction with Fzo1. This paper is relevant because it identifies a specific molecular mechanism (Atp12/Fzo1 interaction) governing mitochondrial dynamics that directly influences chronological lifespan, a fundamental model for studying cellular aging and the root causes of senescence.
Assessing and validating circulating biomarkers is essential for developing preclinical measures of biological aging in mice. However, comprehensive serum proteomics are limited by technical challenges and low sample volumes. Here we present a quantitative nanoparticle-based…
Abstract
Assessing and validating circulating biomarkers is essential for developing preclinical measures of biological aging in mice. However, comprehensive serum proteomics are limited by technical challenges and low sample volumes. Here we present a quantitative nanoparticle-based enrichment workflow coupled with data-independent acquisition mass spectrometry for deep proteomic profiling of low-volume mouse serum. This approach increased proteomic coverage by 3-6-fold with median coefficient of variation <10%. In 30 mice aged 12, 24 and 30 months, we uncovered 3,992 protein groups from 20 µl of serum and revealed age- and sex-specific changes, and capturing senescence-associated circulating proteins. With 1 µl additional serum,the proximity extension assay quantified 43 cytokines not detected by mass spectrometry. Comparison with plasma proteomics from the Baltimore Longitudinal Study of Aging identified conserved age-associated circulating proteins, several of which were linked to frailty in humans, notably COL6A3. These results establish a scalable approach for discovering aging biomarkers in sample-limited mouse studies with translational relevance to human health.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper demonstrates that a nanoparticle-based enrichment workflow coupled with data-independent acquisition mass spectrometry can achieve deep proteomic profiling of low-volume mouse serum, identifying age- and sex-specific changes and conserved human aging biomarkers. This is relevant because it provides a scalable, high-sensitivity technical method for discovering circulating biomarkers of biological aging in preclinical models, which is essential for validating interventions that target the root causes of aging, although the study itself is primarily methodological and cross-sectional rather than demonstrating a lifespan-extending intervention.
When subject to damage or stress, cells develop responses in order to maintain tissue homeostasis. Two such responses are ferroptosis and cellular senescence, but how cells decide between these outcomes remains unclear. Here, we show that senescent cells increase import and…
Abstract
When subject to damage or stress, cells develop responses in order to maintain tissue homeostasis. Two such responses are ferroptosis and cellular senescence, but how cells decide between these outcomes remains unclear. Here, we show that senescent cells increase import and membrane levels of multiple polyunsaturated fatty acids (PUFAs), but a specific intermediate PUFA, dihomo-gamma-linolenic acid (DGLA, 20:3ω-6), is reduced. Exogenous repletion of DGLA instead results in cell death by ferroptosis. Senescent cells manifest additional features associated with ferroptosis, including labile iron and expression of lipoxygenases as well as low-level membrane peroxidation. Oral DGLA supplementation lowers markers of senescence in aged mice and improves age-related functional outcomes. Finally, obese humans with lowered DGLA desaturation rates have lower markers of adipose tissue senescence. Together, our data implicate shifts in PUFA metabolism as a driver of decisions between senescence and ferroptosis.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper claims that the specific reduction of the polyunsaturated fatty acid DGLA in senescent cells drives the cellular decision toward senescence rather than ferroptosis, and that restoring DGLA levels can reverse senescence markers and improve age-related functional outcomes. This is highly relevant to longevity research because it identifies a specific metabolic mechanism (PUFA desaturation) that acts as a switch between two distinct cell fates, offering a potential therapeutic target to prevent or reverse cellular senescence, a core driver of biological aging, rather than merely treating downstream symptoms.
Epigallocatechin gallate (EGCG), a major tea polyphenol, has been proposed to promote healthy aging, but population-level evidence and underlying mechanisms remain unclear. We analyzed 10,977 participants from the National Health and Nutrition Examination Survey (NHANES) and…
Abstract
Epigallocatechin gallate (EGCG), a major tea polyphenol, has been proposed to promote healthy aging, but population-level evidence and underlying mechanisms remain unclear. We analyzed 10,977 participants from the National Health and Nutrition Examination Survey (NHANES) and conducted mechanistic studies in Caenorhabditis elegans and AML12 hepatocytes. Compared with non-consumers, both lower and higher EGCG intake categories were associated with lower PhenoAge acceleration, lower all-cause mortality, and higher estimated residual life expectancy. In C. elegans, EGCG supplementation extended lifespan and health span. Transcriptomics revealed upregulation of peroxisome-related genes. EGCG enhanced peroxisome biogenesis, as shown by increased peroxisome abundance, elevated prx-5 and prx-19 mRNA levels, and increases in PRX-5 and PRX-19 proteins. This increase in peroxisome capacity was accompanied by enhanced peroxisomal fatty acid β-oxidation, with increased mRNA levels of acox-1.2, acox-3, and dhs-28, increased ACOX-3 protein, and reduced very long-chain fatty acids (VLCFAs). Lipidomics showed enhanced processing of VLCFAs and accumulation of shorter-chain intermediates. Knockdown of prx-5, acox-1.2, or dhs-28 abolished EGCG-induced lifespan and health span benefits. In doxorubicin-induced senescent AML12 hepatocytes, EGCG reduced the proportion of SA-β-gal-positive cells and decreased p21 and p16 protein levels, while increasing peroxisome abundance and peroxisome-related proteins, including the biogenesis factors PEX5 and PEX19, the membrane transporters ABCD1 and PMP70, and the β-oxidation enzymes ACOX1, HSD17B4, EHHADH, and ACAA1. Conversely, the anti-senescent effects of EGCG were attenuated by Pex5 or Acox1 knockdown. Collectively, dietary EGCG intake is associated with slower biological aging, while experimental findings support peroxisome biogenesis and peroxisomal fatty acid β-oxidation in EGCG-mediated anti-aging effects.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper claims that dietary EGCG extends lifespan and delays biological aging by activating peroxisome biogenesis and enhancing peroxisomal fatty acid β-oxidation. This is relevant because it identifies a specific cellular mechanism (peroxisome function) through which a common dietary compound may mitigate aging processes, supported by both large-scale epidemiological data and mechanistic validation in model organisms.
Chromatin stability and nuclear architectural integrity constitute the primary defense against cellular senescence. Their collapse precipitates genomic disarray, epigenetic misregulation, and functional decline in stem cells. Although TOP2A is conventionally known for resolving…
Abstract
Chromatin stability and nuclear architectural integrity constitute the primary defense against cellular senescence. Their collapse precipitates genomic disarray, epigenetic misregulation, and functional decline in stem cells. Although TOP2A is conventionally known for resolving DNA topological stress, its role in aging remains largely unexplored. Here, we found that TOP2A expression progressively decreased in senescent mesenchymal stem cells (MSCs), and its depletion initiated a catastrophic nuclear remodeling process characterized by the loss of Lamin B1, heterochromatin erosion, and senescence-associated phenotypes. Mechanistically, TOP2A directly regulated the expression of Lamin B1 to maintain nuclear architecture. TOP2A depletion set off a domino effect involving nuclear membrane rupture, loss of heterochromatin-associated factors (H3K9me3, KAP1, and LAP2), deterioration of cellular functions and acceleration of senescence. Notably, overexpression of TOP2A restored Lamin B1 levels, mitigated nuclear protein loss, preserved nuclear integrity, and counteracted cellular senescence. The in vivo relevance of these findings was further underscored by TOP2A inhibitor-induced brain aging in murine models. Our study establishes TOP2A as a novel modulator of cellular senescence, which stabilizes heterochromatin and nuclear structure, and provides new perspectives for targeting chromatin-based mechanisms in aging.
AI-generated longevity analysis. Check claims against the paper.
Summary
TOP2A maintains heterochromatin stability and counteracts cellular senescence by directly sustaining LMNB1 expression. This paper is relevant because it identifies a specific molecular mechanism (TOP2A-LMNB1 axis) that preserves nuclear architecture and prevents the chromatin collapse associated with the aging process, offering a potential target for interventions aimed at delaying senescence.
Age is the strongest risk factor for cardiovascular disease, yet biological aging is increasingly recognized as a modifiable process. Animal studies over the past few decades have demonstrated that genetic, pharmacological, and dietary interventions can extend the healthspan and…
Abstract
Age is the strongest risk factor for cardiovascular disease, yet biological aging is increasingly recognized as a modifiable process. Animal studies over the past few decades have demonstrated that genetic, pharmacological, and dietary interventions can extend the healthspan and lifespan of animals by targeting conserved mechanisms of aging. Examining whether lifespan-extending interventions work in humans is challenging due to the long lifespan of our species. However, the development of biomarkers of biological aging or "aging clocks" has allowed for human trials where the rate of biological aging can be estimated. These surrogate markers now enable the first generation of human geroscience trials, in which interventions such as caloric restriction, rapamycin, taurine, plasma exchange, or nutritional strategies are evaluated for their ability to slow biological aging. Particularly relevant for cardiology are recently developed organ- and cell-specific aging clocks that estimate the biological age of the heart, vasculature, and cardiovascular cell types. These biomarkers may be suitable for improving cardiovascular risk prediction and providing surrogate outcomes for trials targeting cardiovascular aging. Together, these advances suggest that slowing biological aging could complement established cardiovascular prevention and treatment strategies in the future.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper posits that biological aging is a modifiable risk factor for cardiovascular disease and that organ-specific aging clocks can serve as surrogate endpoints for geroscience trials. This is a review article summarizing existing concepts in geroscience and cardiovascular aging rather than presenting novel experimental data or a breakthrough mechanism, making it a solid but limited contribution to the field.
Our body is continuously exposed to endogenous and exogenous sources of oxidative stress arising from physiological metabolism and environmental factors such as ultraviolet (UV) radiation. These stresses generate reactive oxygen species (ROS) that can induce genotoxicity through…
Abstract
Our body is continuously exposed to endogenous and exogenous sources of oxidative stress arising from physiological metabolism and environmental factors such as ultraviolet (UV) radiation. These stresses generate reactive oxygen species (ROS) that can induce genotoxicity through oxidative DNA damage. To evaluate the contribution of NRF2, which is a master transcription factor regulating cellular antioxidant responses, to the suppression of oxidative stress-induced genotoxicity in the skin, we examined Nrf2-deficient mice regarding mutagenic responses to two separate biological situations: acute UVB exposures and the chronic process of aging. Analyses were performed using transgenic mice carrying the bacterial lacZ gene as a mutational reporter. No significant differences were detected between Nrf2-deficient and wild-type mice in mutagenicity, induced mutation spectrum, and mutation distribution within the reporter gene after acute UVB exposure, whereas the dose-response kinetics of UVB-induced mutation in the phase called "mutation induction suppression" (MIS) differed significantly between genotypes, with a more pronounced MIS response observed in the Nrf2-/- epidermis. Little contribution of ROS to genotoxicity was observed after the acute exposure. Notably, however, the age-dependent accumulation of mutations was significantly elevated in the Nrf2-deficient epidermis compared to the wild-type. These findings indicate that NRF2 plays a protective role for the skin, not by directly preventing genotoxicity, but by promoting tissue recovery after acute UVB damage and, more importantly, by suppressing the genotoxic effects of physiologically produced ROS in a chronic aging process.
AI-generated longevity analysis. Check claims against the paper.
Summary
NRF2 suppresses age-dependent mutation accumulation in skin epidermis by mitigating chronic oxidative stress rather than preventing acute UVB-induced genotoxicity. This study provides mechanistic evidence that NRF2 is a critical regulator of the mutational burden associated with the aging process, identifying it as a potential target for interventions aimed at slowing the accumulation of somatic mutations that drive age-related decline.
The major characteristics of cellular senescence are stable cell-cycle arrest, accumulation of DNA damage responses, mitochondrial dysfunction, metabolic remodeling, and the release of pro-inflammatory senescence-associated secretory phenotype (SASP) factors. Redox imbalance…
Abstract
The major characteristics of cellular senescence are stable cell-cycle arrest, accumulation of DNA damage responses, mitochondrial dysfunction, metabolic remodeling, and the release of pro-inflammatory senescence-associated secretory phenotype (SASP) factors. Redox imbalance plays a significant role in the initiation and maintenance of senescence, and the mammalian thioredoxin system-comprising cytosolic Trx-1, mitochondrial Trx-2, thioredoxin reductases (TrxR1, TrxR2), and the inhibitor TXNIP-is at a key juncture between oxidative stress, cellular ageing, and age-related diseases. Evidence was identified through a structured literature search of PubMed, Web of Science, and Scopus from inception to July 2026 using predefined search terms and eligibility criteria. Primary experimental studies in mammalian cells, tissues, or animal models that directly measured senescence markers were prioritised. Reviews, non-mammalian studies, and studies reporting only general oxidative-stress endpoints were included only when they provided essential mechanistic context and are clearly labelled as such. This review focuses primarily on mammalian mechanisms linking the thioredoxin system to senescence initiation, senescence maintenance, inflammaging, tissue dysfunction, and translational geroscience. We distinguish isoform-specific and context-dependent effects of Trx-1, Trx-2, TrxR, and TXNIP. We also discuss therapeutic strategies targeting the thioredoxin system, including redox modulation, isoform-selective inhibitors, senomorphic approaches, and disease-specific interventions. Overall, the thioredoxin system is a significant molecular link between redox homeostasis, cellular senescence, ageing biology, and age-related pathology, and a candidate target for future geroscience interventions, although direct evidence in aged mammals remains limited.
AI-generated longevity analysis. Check claims against the paper.
Summary
The thioredoxin system acts as a critical molecular link between redox homeostasis and cellular senescence, representing a viable target for geroscience interventions. This review synthesizes existing evidence on how manipulating this specific redox pathway could influence the initiation and maintenance of senescence, offering a mechanistic framework for potential anti-aging therapies, though it remains a descriptive summary rather than a primary breakthrough.
Biological aging drives cellular dysfunction and human disease, yet studying human aging dynamics remains challenging due to limited experimental platforms. Here we show that long-term post-mitotic culture of human fibroblasts recapitulates and accelerates features of in vivo…
Abstract
Biological aging drives cellular dysfunction and human disease, yet studying human aging dynamics remains challenging due to limited experimental platforms. Here we show that long-term post-mitotic culture of human fibroblasts recapitulates and accelerates features of in vivo aging. Longitudinal paired transcriptomic and epigenetic analyses of four female fibroblast lines revealed that in vitro aging reflects key signatures of in vivo primary fibroblast aging. Direct neuronal conversion of in vitro-aged fibroblasts preserved biological age, enabling pseudo-longitudinal modeling of neuronal aging through direct reprogramming. Single-cell transcriptomics of in vitro-aging fibroblasts revealed a time-dependent increase in age-heterogeneity, consistent with the previously reported age-associated heterogeneity driven by the variable loss of transcriptional programs in vivo. Using this accelerated aging platform, we evaluated anti-aging compounds: Metformin broadly attenuated transcriptomic and epigenetic aging, while Rapamycin showed limited efficacy. These findings align with pre-clinical evidence, providing a platform to evaluate and predict therapeutic anti-aging compound efficacy at molecular resolution. This system advances our understanding of aging mechanisms and facilitates the development of interventions against age-related diseases.
AI-generated longevity analysis. Check claims against the paper.
Summary
Long-term post-mitotic culture of human fibroblasts recapitulates in vivo aging signatures and enables the evaluation of anti-aging compounds like Metformin. This is relevant because it provides a scalable, human-specific platform to test interventions against the root causes of aging, although the use of fibroblasts and the limited efficacy of Rapamycin suggest it is a solid but incremental advance in aging research tools rather than a major breakthrough.
Efforts to extend longevity and healthspan have benefited from the use of in vitro systems, short-lived model organisms and computational approaches, but translation to humans depends on demonstrating efficacy and safety in mammalian in vivo models. However, rigorously…
Abstract
Efforts to extend longevity and healthspan have benefited from the use of in vitro systems, short-lived model organisms and computational approaches, but translation to humans depends on demonstrating efficacy and safety in mammalian in vivo models. However, rigorously controlled rodent lifespan studies are slow, costly and low-throughput. Hormesis, the induction of adaptive stress response pathways by low-level toxic or metabolic challenges, provides a mechanistic means for improved resilience, but testing hormetic dose-response relationships in mammals is logistically challenging. Regulatory long-term toxicity studies, mandated for chemical authorisation, routinely generate lifespan and chronic toxicity data from large cohorts across multiple dose groups and therefore represent an underused resource for detecting unexpected survival benefits. We mined a random subset of the German Federal Institute for Risk Assessment (BfR) electronic archive for long-term rodent pesticide studies in ≥ 50 animals per dose and sex. From qualifying studies with 154 substances, we identified 27 substances (18% of entries) that significantly increased survival at study termination (≥ 10%, p < 0.05). Fifteen publicly disclosable substances were examined further; roughly half perturbed mitochondrial oxygen consumption rates in mammalian cells, and bromoxynil acted as a mitochondrial uncoupler. Back-translation to Caenorhabditis elegans showed bromoxynil improved multiple healthspan indicators without compromising organismal health. Regulatory toxicity archives can thus be repurposed to identify candidate compounds, targets and mechanisms for mammalian healthy ageing research, complement conventional screening pipelines, align with 3Rs by maximising existing data, and supply high-quality datasets for AI-driven prioritisation of interventions for rigorous preclinical follow-up.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper claims that mining existing regulatory rodent toxicity archives can identify candidate compounds with hormetic longevity effects, specifically highlighting bromoxynil as a mitochondrial uncoupler that improves healthspan in C. elegans. This is relevant because it proposes a novel, high-throughput method for discovering mammalian longevity agents by repurposing existing safety data, thereby bypassing the need for new, costly lifespan studies for initial screening.
Mesenchymal stem cells (MSCs) are widely used to modulate immune responses and promote tissue regeneration, but cellular senescence significantly impairs their therapeutic potential. MSCs undergo senescence characterized by an enlarged morphology, reduced proliferative capacity…
Abstract
Mesenchymal stem cells (MSCs) are widely used to modulate immune responses and promote tissue regeneration, but cellular senescence significantly impairs their therapeutic potential. MSCs undergo senescence characterized by an enlarged morphology, reduced proliferative capacity, and altered expression of genes related to the cytoskeleton. This study revealed that the mechanical microenvironment critically regulates MSC aging. Culturing senescent MSCs on high-stiffness extracellular matrix (ECM) hydrogels reverses key aspects of the senescent phenotype, including the restoration of normal morphology, improved cytoskeletal integrity, and enhanced proliferation. This mechanical rescue is accompanied by genetic reprogramming and activation of the PI3K-AKT signaling pathway. The inhibition of PI3K-Akt with LY294002 abolished these rejuvenating effects. These findings demonstrate that the mechanical microenvironment can reprogram senescent MSCs through PI3K-AKT-mediated mechanotransduction, offering a novel strategy to restore stem cell function in aging and regenerative medicine.
AI-generated longevity analysis. Check claims against the paper.
Summary
Culturing senescent mesenchymal stem cells on high-stiffness extracellular matrix hydrogels reverses key aspects of the senescent phenotype via PI3K-AKT signaling. This is relevant because it identifies a specific mechanotransduction pathway that can reverse cellular senescence, a fundamental hallmark of aging, offering a potential strategy to restore stem cell function in aged tissues.
Most organisms become increasingly likely to die as they grow older, a phenomenon known as demographic senescence. We develop a general mathematical framework for modelling senescence in which individuals are viewed as comprising a fixed number of interacting intra-organismal…
Abstract
Most organisms become increasingly likely to die as they grow older, a phenomenon known as demographic senescence. We develop a general mathematical framework for modelling senescence in which individuals are viewed as comprising a fixed number of interacting intra-organismal sub-systems, each characterised by stochastic failure and repair rates. In many organisms, `failure begets failure' because sub-systems are typically interdependent. We use diffusion approximations to derive an expression for population-level mortality curves in this setting, and demonstrate that greater interdependence leads to faster rates of senescence. Since individuals who die can no longer age, observed cohorts become increasingly composed of `lucky' individuals that avoided death by (stochastically) taking paths in failure space associated with lower mortality despite no intrinsic differences in their quality. Selective disappearance of `unlucky' individuals generates deviations of population-level measurements from individual-level trajectories, causing late-life mortality plateaus. We show that while these deviations must always exist, they may often be too small to detect, either because the failure accumulation process is stereotyped or because detection requires unreasonably large cohort sizes. We provide necessary and asymptotically sufficient conditions for Gompertz-Makeham mortality in our framework, with falsifiable predictions in terms of a scaling law for mortality near complete failure. We also show that the simplest null model in our framework leads to exact Gompertz-Makeham curves. Our work establishes a general framework for modelling demographic senescence and selective disappearance from biological first principles, and provides concrete predictions for when Gompertz-Makeham mortality emerges in such models.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper demonstrates that stochastic failure accumulation in interdependent sub-systems naturally generates Gompertz-Makeham mortality curves and late-life mortality plateaus through selective disappearance. This is relevant because it provides a fundamental mathematical framework for understanding the root causes of demographic senescence and the emergence of mortality patterns, rather than focusing on symptomatic treatments or social aspects of aging.
Cellular senescence contributes to age-related tissue dysfunction and is closely linked to metabolic remodeling and mitochondrial redox imbalance. However, senotherapeutic strategies with defined molecular targets and functionally validated downstream mechanisms remain limited.
Abstract
Cellular senescence contributes to age-related tissue dysfunction and is closely linked to metabolic remodeling and mitochondrial redox imbalance. However, senotherapeutic strategies with defined molecular targets and functionally validated downstream mechanisms remain limited.
AI-generated longevity analysis. Check claims against the paper.
Summary
Ziyu glycoside I suppresses cellular senescence and ameliorates age-related functional decline by stabilizing LDHA and restoring lactate output. This paper is relevant because it identifies a specific molecular mechanism (LDHA stabilization) and a potential senotherapeutic agent that targets the root cause of aging (cellular senescence) rather than just treating downstream symptoms.
The deacetylase SIRT1 is a critical regulator of cellular senescence, and the excessive accumulation of senescent cells can further drive the onset of organismal aging. SIRT1 activity is tightly governed by posttranslational modifications, including ubiquitination. While…
Abstract
The deacetylase SIRT1 is a critical regulator of cellular senescence, and the excessive accumulation of senescent cells can further drive the onset of organismal aging. SIRT1 activity is tightly governed by posttranslational modifications, including ubiquitination. While ubiquitination has been well documented to control SIRT1 protein stability, the precise regulatory pathway underlying SIRT1 activity remains poorly understood. Here, we identify the deubiquitinase USP25 as a central regulator of cellular senescence. Specifically, USP25 deficiency in mice mitigates age-related phenotypes and improves overall physiological function. Mechanistically, USP25 directly interacts with SIRT1 and mediates its deubiquitylation via K63-linked polyubiquitination, specifically targeting SIRT1 lysine residues K506 and K513, which ultimately suppresses SIRT1 deacetylase activity. Reduced SIRT1 deacetylase activity, in turn, increases P53 or PGC1α acetylation, which further increases the transcriptional activation of downstream target genes and consequently accelerates cellular senescence. Furthermore, we developed a cell-penetrating peptide, pSirt1-4, that efficiently disrupts the USP25-SIRT1 interaction, increases SIRT1 deacetylase activity, and attenuates cellular senescence. Collectively, our findings establish USP25 as a critical regulator of aging and highlight the USP25-SIRT1 axis as a promising therapeutic target for treating senescence-related diseases.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper claims that disrupting the USP25-SIRT1 interaction via a novel peptide activates SIRT1 deacetylase activity, thereby suppressing cellular senescence and mitigating age-related phenotypes in mice. This is relevant to longevity research as it identifies a specific molecular mechanism (USP25-mediated deubiquitination) regulating SIRT1, a known longevity gene, and proposes a direct therapeutic intervention to reduce senescent cell burden, which is a root cause of aging.
Quantifying biological aging and predicting age-related functional decline are increasingly important for reducing the health and socioeconomic burden of population aging. DNA methylation is one of the most extensively studied epigenetic features of aging and underlies…
Abstract
Quantifying biological aging and predicting age-related functional decline are increasingly important for reducing the health and socioeconomic burden of population aging. DNA methylation is one of the most extensively studied epigenetic features of aging and underlies epigenetic clocks, promising quantitative biomarkers of biological age. However, the molecular processes driving age-associated DNA methylation changes and the biological signals captured by these clocks remain unclear. A major unresolved issue is the contribution of oxidized 5-methylcytosine (5mC) derivatives to epigenetic remodeling during aging. These derivatives, including 5-hydroxymethylcytosine (5hmC), 5-formylcytosine and 5-carboxylcytosine, are generated through TET-mediated oxidation of 5mC. Although they can act as intermediates of DNA demethylation, they may also represent epigenetic signals with regulatory functions distinct from 5mC. This review summarizes current evidence on oxidized 5mC derivatives in mammalian aging, focusing on 5hmC. Aging is associated with context-dependent changes in global 5hmC levels and genome-wide distribution. Age-associated differentially hydroxymethylated regions occur in genes, regulatory elements, repetitive sequences and transposable elements. 5hmC and 5mC changes often show distinct genomic distributions, suggesting partially independent epigenetic processes. 5hmC may regulate transcriptional stability, cellular identity, inflammation and tissue vulnerability. Understanding the TET/5hmC pathway may improve interpretation of epigenetic aging and support 5hmC-based clocks and healthy-aging strategies.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper reviews evidence that 5-hydroxymethylcytosine (5hmC) undergoes distinct, context-dependent changes during aging that are partially independent of 5mC, suggesting it captures unique biological signals for epigenetic clocks. This is relevant because it addresses the fundamental molecular mechanisms of epigenetic aging and proposes 5hmC as a potential biomarker for biological age, which is central to understanding and potentially intervening in the aging process, though as a review it offers no new experimental data or direct interventions.
SKN-1, a Cap'n'Collar transcription factor in Caenorhabditis elegans, is a well-established regulator of oxidative stress responses and xenobiotic detoxification. Over the past two decades, the late Dr. T. Keith Blackwell (1957-2025) and colleagues made seminal contributions to…
Abstract
SKN-1, a Cap'n'Collar transcription factor in Caenorhabditis elegans, is a well-established regulator of oxidative stress responses and xenobiotic detoxification. Over the past two decades, the late Dr. T. Keith Blackwell (1957-2025) and colleagues made seminal contributions to defining its biological functions and regulatory mechanisms. Owing to its robust conservation with mammalian Nrf family proteins, SKN-1 research has yielded fundamental insights into how nutrient and stress signals modulate metabolism, proteostasis, and aging. Recently, the discovery that distinct SKN-1 isoforms execute unique physiological roles has further refined this field. In this review, we summarize how SKN-1 regulates longevity, particularly through the mTOR nutrient-sensing pathway, discuss recent advances in isoform-specific regulation, and highlight critical questions for future research.
AI-generated longevity analysis. Check claims against the paper.
Summary
Distinct SKN-1 isoforms regulate C. elegans longevity through specific interactions with the mTOR nutrient-sensing pathway. This review synthesizes existing knowledge on how isoform-specific regulation of the Nrf2 homolog SKN-1 modulates aging via mTOR signaling, providing a mechanistic framework for understanding conserved longevity pathways, though as a review it offers no new experimental data or breakthroughs.
Protein arginine methyltransferase 7 (PRMT-7) contributes approximately 30% of total protein arginine monomethylation in Caenorhabditis elegans. Loss of prmt-7 extended lifespan without affecting brood size. However, prmt-7 mutants showed reduced heat-stress resistance, and…
Abstract
Protein arginine methyltransferase 7 (PRMT-7) contributes approximately 30% of total protein arginine monomethylation in Caenorhabditis elegans. Loss of prmt-7 extended lifespan without affecting brood size. However, prmt-7 mutants showed reduced heat-stress resistance, and transient heat stress did not further extend their lifespan, suggesting distinct roles for PRMT-7 in longevity and heat-stress adaptation.
AI-generated longevity analysis. Check claims against the paper.
Summary
Loss of PRMT-7 extends lifespan in C. elegans while simultaneously impairing heat-stress resistance, indicating that the molecular pathways governing longevity and stress adaptation are distinct. This study contributes to the understanding of the genetic and epigenetic mechanisms underlying aging by identifying a specific methyltransferase that influences lifespan independently of general stress resilience, offering a new target for investigating the root causes of aging.
Cellular senescence is a biological process characterized by stable cell cycle arrest that contributes to tumor suppression and tissue remodeling but can also promote aging-associated dysfunction when senescent cells persist and accumulate. Senescent cells influence neighboring…
Abstract
Cellular senescence is a biological process characterized by stable cell cycle arrest that contributes to tumor suppression and tissue remodeling but can also promote aging-associated dysfunction when senescent cells persist and accumulate. Senescent cells influence neighboring and distant tissues through the senescence-associated secretory phenotype (SASP), of which extracellular vesicles (EVs) are an increasingly recognized component. This review examines how microRNAs (miRNAs) carried by EVs regulate senescence and ageing. miRNAs are key post-transcriptional regulators of senescence, particularly within the p53/p21
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper reviews how microRNA-loaded extracellular vesicles mediate the senescence-associated secretory phenotype (SASP) to propagate aging signals. This is relevant because it addresses the mechanism of senescent cell accumulation and its systemic effects, which are considered root causes of aging, though as a review article it provides a synthesis of existing knowledge rather than a novel breakthrough.
Bone marrow macrophages (BMMs) coordinate skeletal remodelling, haematopoietic niche function, immune surveillance, and tissue repair. Whether a persistent senescent state in BMMs is a causal driver of skeletal ageing, however, remains unresolved. The central challenge is both…
Abstract
Bone marrow macrophages (BMMs) coordinate skeletal remodelling, haematopoietic niche function, immune surveillance, and tissue repair. Whether a persistent senescent state in BMMs is a causal driver of skeletal ageing, however, remains unresolved. The central challenge is both definitional and causal: macrophages may be quiescent, terminally differentiated, chronically activated, tolerant, or metabolically dysfunctional, whereas commonly used senescence markers-including p16
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper investigates whether a persistent senescent state in bone marrow macrophages is a causal driver of skeletal aging and systemic consequences. This is relevant to longevity research because it addresses the cellular mechanisms of aging (senescence) and their role in tissue degeneration, rather than merely treating the symptoms of osteoporosis or bone loss.
Insights into the genetic basis of lifespan evolution can link evolutionary theory with an understanding of health, disease and adaptation. We leverage the power of >200 generations of experimental evolution in a seed beetle to unveil the genomic architecture of lifespan…
Abstract
Insights into the genetic basis of lifespan evolution can link evolutionary theory with an understanding of health, disease and adaptation. We leverage the power of >200 generations of experimental evolution in a seed beetle to unveil the genomic architecture of lifespan evolution. Replicated populations evolved under regimes favoring either a short or long life, resulting in a near doubling of lifespan. Whole genome re-sequencing revealed that short- and long-lived lines were strongly differentiated (global FST = 0.41) and more than 700 genes showed consistent signs of divergent selection. Remarkably, short- and long-lived lines were consistently divergent in a large number of regions harboring copy-number variants (CNVs), involving >600 genes. The evolution of a long life involved many distinct biological processes, such as DNA fidelity, mitotic integrity, reproduction, metabolism, immunity and stress response. A pedigree-based genome scan for quantitative trait loci (QTLs) uncovered several QTLs with large effects on lifespan, but the genetic basis of a long life was dominated by a very large number of regions with medium and small effects. The genome-wide spatial association with QTL effects was, if anything, stronger for CNVs than for sequence variants. The genetic effects of QTLs on lifespan were positively correlated overall between the sexes, but four regions showed pronounced sex-differences. Our results show that structural variants play a significant role in the evolution of an extended lifespan and the highly polygenic genomic architecture is to some extent sex-specific, consistent with differences in physiology and life history tradeoffs between the sexes.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper demonstrates that structural variants, particularly copy-number variants, and sex-specific genetic effects play a significant role in the evolutionary adaptation of lifespan. This is relevant because it identifies specific genomic mechanisms (CNVs) and sex-specific trade-offs that drive the evolution of longevity, providing a foundational understanding of the genetic architecture necessary for extending lifespan.
Neuroligins are conserved postsynaptic adhesion proteins involved in synaptic function and behaviour. In Drosophila melanogaster, Neuroligin 3 (Nlg3) regulates social behaviour, sleep and synaptic architecture. We now report, through analysis of publicly available…
Abstract
Neuroligins are conserved postsynaptic adhesion proteins involved in synaptic function and behaviour. In Drosophila melanogaster, Neuroligin 3 (Nlg3) regulates social behaviour, sleep and synaptic architecture. We now report, through analysis of publicly available transcriptomics data, confirmed with RT-qPCR data, that loss-of-function of the nlg3 gene downregulates the expression of longevity-associated genes foxo, hsp70s, and hsp68. Graded genetic manipulation of the Drosophila melanogaster neuroligin 3 (nlg3) gene indeed modulates both social spacing and lifespan. Specifically, reduced nlg3 expression (via heterozygous deletion, or transposable-element insertion) extends lifespan in both sexes, while overexpression or complete deletion shortens it. In contrast, overexpression or complete loss of nlg3 leads the flies to be further apart (increased social distance, or social space), as does RNAi knockdown, while heterozygous reduction of nlg3 expression either lowers or does not alter the flies social space. This work identifies a previously unrecognized link between a conserved synaptic gene, social behaviour, and organismal longevity.
AI-generated longevity analysis. Check claims against the paper.
Summary
The paper claims that graded genetic manipulation of the neuroligin 3 (nlg3) gene in Drosophila modulates organismal lifespan, with reduced expression extending life and overexpression or complete deletion shortening it. This is relevant because it identifies a conserved synaptic protein as a regulator of longevity, suggesting a potential mechanistic link between synaptic function, social behavior, and aging pathways (such as FOXO and heat shock proteins), although the findings are limited to a model organism and represent an incremental step in understanding the genetic architecture of lifespan rather than a direct intervention for human aging.
Cardiomyocyte senescence is a hallmark of cardiac aging and closely associated with diastolic dysfunction and heart failure in older adults. Strategies to effectively delay or reverse cardiomyocyte senescence in the aged heart remain limited. We investigated whether NAD+…
Abstract
Cardiomyocyte senescence is a hallmark of cardiac aging and closely associated with diastolic dysfunction and heart failure in older adults. Strategies to effectively delay or reverse cardiomyocyte senescence in the aged heart remain limited. We investigated whether NAD+ replenishment regulates cardiomyocyte senescence and cardiac function in aging.
AI-generated longevity analysis. Check claims against the paper.
Summary
NAD+ replenishment reduces cardiomyocyte senescence and improves diastolic function in the aged male heart. This study addresses a fundamental mechanism of aging (NAD+ decline and cellular senescence) rather than merely treating symptoms, demonstrating that restoring metabolic precursors can mitigate specific age-related cardiac dysfunction.
Aging is an important risk factor for musculoskeletal disorders such as osteoarthritis, osteoporosis, and sarcopenia. Cellular senescence contributes to age-related tissue deterioration by promoting functional alterations and a pro-inflammatory environment, making…
Abstract
Aging is an important risk factor for musculoskeletal disorders such as osteoarthritis, osteoporosis, and sarcopenia. Cellular senescence contributes to age-related tissue deterioration by promoting functional alterations and a pro-inflammatory environment, making senotherapeutics promising strategies to selectively eliminate senescent cells or limit their deleterious effects. Our systematic review synthesized the available preclinical evidence on the efficacy of senotherapeutics in murine models of osteoarthritis, osteoporosis, and sarcopenia, analyzing structural and functional outcomes and the main molecular mechanisms involved in the regulation of cellular senescence. A literature search was conducted in the MEDLINE, Scopus, and Web of Science databases according to PRISMA guidelines, while the methodological quality of the included studies was assessed using the SYRCLE RoB tool. 26 experimental studies were included, of which 15 involved osteoarthritis models, 6 osteoporosis models, and 5 sarcopenic models. Overall, senotherapeutics demonstrated protective effects on musculoskeletal tissues by reducing inflammation and improving the evaluated outcomes through the modulation of pathways associated with cellular senescence. However, the heterogeneity of experimental models, therapeutic protocols, and outcome measures limits the possibility of drawing definitive conclusions. Further studies will be necessary to clarify the molecular mechanisms involved, optimize therapeutic strategies, and promote the translation of experimental evidence into clinical practice.
AI-generated longevity analysis. Check claims against the paper.
Summary
Senotherapeutics demonstrate protective effects on musculoskeletal tissues in murine models by reducing inflammation and modulating cellular senescence pathways. This systematic review synthesizes preclinical evidence supporting the hypothesis that targeting cellular senescence—a fundamental hallmark of aging—can mitigate age-related musculoskeletal disorders, thereby addressing a root cause of aging rather than merely treating symptoms.