Longevity Papers

Aging is a complex biological process involving coordinated changes across multiple molecular systems. Traditional reductionist approaches, while valuable, are insufficient to capture the full scope of aging's systemic nature. Multiomics - integrating data from genomics, transcriptomics, epigenomics, proteomics, and metabolomics - provides a comprehensive framework to study aging as an interconnected network. In this Perspective, I explore how multiomic strategies, particularly those leveraging epigenomic and single-cell data, are reshaping our understanding of aging biology. Epigenetic alterations, including DNA methylation and histone modifications, are not only hallmarks but also powerful biomarkers of biological age. I discuss advances in multiomic aging clocks, cross-tissue atlases, and single-cell spatial technologies that decode aging at unprecedented resolution. I also build on a prior review I wrote with colleagues, Epigenomics. 2023;15(14):741-754, which introduced the concept of pathological epigenetic events that are reversible (PEERs) - epigenetic alterations linked to early-life exposures that predispose to aging and disease but may be therapeutically modifiable. This Perspective examines how PEERs and multiomics intersect to inform biomarkers, geroprotective interventions, and personalized aging medicine. Finally, I highlight integration challenges, ethical concerns, and the need for standardization to accelerate clinical translation. Together, these insights position multiomics as a central pillar in the future of aging research.

Aging is associated with a decline in the regenerative capacity of many tissues. Central to this decline is a complex interplay between inflammation and stem cell function. How these two processes are linked and influence regenerative capacity remains unclear. Here, we undertake a comprehensive assessment of age-related changes in the mouse colon at single-cell resolution. A survey of immune and epithelial compartments revealed a hyperactivated inflammatory state in the colon of old mice characterized by the induction of an interferon {gamma} (IFN{gamma}) response signature in immune cells. This does not result in increased inflammation under homeostasis, but triggers a disproportionate inflammatory response, disrupting regeneration after challenge with the enteropathogen Citrobacter rodentium. Colons of old mice exhibit higher production of IFN{gamma} by T and innate lymphoid cells (ILCs) that are associated with reduced Lgr5+ stem cells and decreased epithelial proliferation. Interestingly, we find aged intestinal epithelial cells to be hypersensitive to IFN{gamma} signaling, inducing a regeneration-associated fetal-like gene expression signature that, in turn, renders these cells more sensitive to IFN{gamma}-induced apoptosis. Our findings reveal an age-related imbalance in the interaction between the immune and epithelial compartments in the colon, priming the system for excessive inflammatory responses and the emergence of a hypersensitive epithelial cell state thus derailing proper repair of the intestinal epithelium after injury.

Muscle regeneration is impaired with aging, due to both intrinsic defects of muscle stem cells (MuSCs) and alterations of their niche. Here, we monitor the cells constituting the MuSC niche over time in young and old regenerating mouse muscle. Aging alters the expansion of all niche cells, with prominent phenotypes in macrophages that show impaired resolution of inflammation. RNA sequencing of FACS-isolated mononucleated cells uncovers specific profiles and kinetics of genes and molecular pathways in old versus young muscle cells, indicating that each cell type responds to aging in a specific manner. Moreover, we show that macrophages have an altered expression of Selenoprotein P (Sepp1). Macrophage-specific deletion of Sepp1 is sufficient to impair the acquisition of their restorative profile and causes inefficient skeletal muscle regeneration. When transplanted in aged mice, bone marrow from young WT mice, but not Sepp1-KOs, restores muscle regeneration. This work provides a unique resource to study MuSC niche aging, reveals that niche cell aging is asynchronous and establishes the antioxidant Selenoprotein P as a driver of age-related decline of muscle regeneration.

Background. Age is one of the major risk factors for a wide range of diseases. Nevertheless, some individuals can better cope with these changes and become centenarians. We hypothesize that their blood transcriptome may provide insights into the mechanisms contributing to healthy aging, as well as enable the discovery of candidate therapeutic targets. The Long-Life Family Study (LLFS), which includes participants from families enriched with long-lived individuals, serves as a valuable dataset for achieving these objectives. Methods. To identify transcripts associated with age, we analyzed the association between age at blood draw and 16,284 RNAseq-based blood transcriptomic data from 2,167 LLFS participants with ages ranging from 18 to 107. We used linear mixed-effect models controlling for familial relatedness and adjusted for genetic, socioeconomic, and technical confounders. We validated results in a dataset of 20,884 RNAseq-based blood transcriptomic data from 434 participants of the Integrative Longevity Omics Study, and compared findings to a published reference aging signature. We integrated the results by building a transcriptomic aging clock. We also identified transcripts associated with mortality risk using a Cox-proportional hazard model. Results. We identified 4,227 transcripts increasing and 4,044 transcripts decreasing with age. Age-associated expression patterns were significantly replicated in external datasets, with high correlation (R = 0.78 - 0.94). Enrichment analysis revealed age-related upregulation of inflammatory and senescence-related pathways (e.g., IFN-{gamma} response, TNF-/NF-{kappa}B signaling), and downregulation of MYC and Wnt/{beta}-catenin targets, among others. WGCNA identified co-expression modules reflecting inflammation, immune signaling, and decreased protein synthesis. We also identified 314 transcripts significantly associated with mortality risk and found that pro-survival gene sets included NK cell-mediated cytotoxicity and GPCR signaling. A subset of transcripts showed age associations unique to longevity-enriched cohorts and not present in non-longevity populations, implicating IL6-Jak-Stat3, mitotic spindle, and p53 pathways. Finally, transcriptomic age (delta-age) was strongly associated with increased mortality (HR = 1.108, p = 3.33e-18), with significant survival differences between delta-age groups. Conclusions. This study identified robust transcriptomic signatures of aging and mortality in a longevity-enriched population, highlighting key biological pathways such as immune modulation, inflammation, and senescence. Age-associated expression profiles that are unique to long-lived individuals may represent resilience mechanisms distinct from general aging trends. Transcriptomic age acceleration is a strong predictor of mortality, reinforcing its utility as a molecular biomarker of biological aging.

Targeting Endoplasmic Reticulum Oxidoreductase 1 Alpha (ERO1A) offers therapeutic potential for ER stress-related conditions, including motor neurone diseases and congenital muscle disorders. However, selective ERO1A inhibitors remain unavailable. Here, we developed a multi-modal discovery pipeline combining molecular docking with in vitro and in vivo assays, screening 401,824 natural products from the COCONUT database. We identified two compounds, S88 and geniposide, that inhibited ERO1A in vitro, reduced tunicamycin-induced ER stress markers in human neurons, and improved locomotion and neuromuscular junctions in UBQLN2ALS Drosophila. S88 maintained efficacy in late-stage disease and extended lifespan in a D-galactose aging model. In fly brains, S88 selectively reduced phosphorylated eIF2a; without lowering its downstream effector ATF4, suggesting engagement of alternative mechanisms preserving ATF4 homeostasis. These findings highlight S88 as a promising lead for treating ER stress-associated neuromuscular disorders and demonstrate the utility of this integrative discovery pipeline for identifying bioactive natural compounds with disease-modifying potential.

Reproduction and immunity are fundamental, energy intensive processes that often compete for resources, leading to trade-offs observed across diverse species. Lipid metabolism plays a crucial role in integrating these processes, particularly during stressful conditions such as pathogenic infections. Yet the molecular mechanisms governing this integration remain poorly understood. TCER-1, the C. elegans homolog of mammalian TCERG1, suppresses immunity and promotes fertility, especially upon maternal infection. Here, we show that TCER-1 regulates two conserved lysosomal lipases, lipl-1 and lipl-2, to balance reproduction, immunity and lifespan. Using transcriptomic, lipidomic, and molecular-genetic analyses, we demonstrate that while both lipl-1 and lipl-2 mediate infection-induced lipid remodeling, lipl-1 enhances immunity and catalyzes the accumulation of ceramide species linked to stress response and longevity, whereas, lipl-2 unexpectedly does not. Both lipases contribute towards fertility outcomes, but lipl-2 is especially critical for maintaining embryonic-eggshell integrity during maternal infection and aging. Strikingly, expression of human lysosomal acid lipase (LAL), the ortholog of lipl genes, rescues the immune defects triggered by lipl-l loss and enhances immune resilience. Together, these findings uncover functionally distinct roles for lipl-1 and lipl-2 in modulating lipid species that shape immune fitness, healthspan and reproductive health, and suggest a potentially conserved mechanism by which lipid metabolism links fertility and immunity.

Osteoarthritis (OA) is a challenging degenerative joint disease with limited treatment options. Subchondral bone plays a critical role in maintaining joint homeostasis and influencing OA progression. Here, we investigated the role of senescence in mesenchyme-derived stem/progenitor cells (MDSPCs) during OA progression, aiming to identify potential therapeutic targets. Histopathological evaluations and bioinformatic analyses of OA samples from both humans and mice revealed that EGFR

Astrocytes, the most abundant glial cells in the central nervous system, play essential roles in maintaining neuronal homeostasis, synaptic regulation, and blood-brain barrier integrity. However, these cells can undergo senescence, a cellular state characterized by irreversible growth arrest and the secretion of proinflammatory factors, in response to aging, and pathological stressors, contributing to synaptic dysfunction and neurodegenerative diseases. This review examines the molecular mechanisms driving astrocytic senescence, including oxidative stress, DNA damage, and inflammatory signaling pathways such as NF-κB and the senescence-associated secretory phenotype (SASP). A particular focus is placed on the diverse array of known chemical inducers of astrocyte senescence such as pesticides and heavy metals, which provide critical insights into the processes governing cellular aging in the brain. By analyzing the effects of these inducers, we highlight their implications for neurodegenerative disease progression and brain aging. Understanding astrocytic senescence offers new insights into age-related neuropathology and presents promising avenues for targeted therapies in neurodegenerative disorders induced by environmental toxicants.

Stress response pathways are emerging as conserved modulators of lifespan. The prevailing hypothesis is that activation of stress responsive pathways, including the amino acid deprivation arm of the integrated stress response (ISR; the GCN2-ATF4 pathway) is pro-longevity. Activation of ATF4 orthologs extends lifespan in Saccharomyces cerevisiae (yeast) and Caenorhabditis elegans, but its role in other longer-lived organisms remains unclear. We comprehensively tested the role of the GCN2-ATF4 pathway in the fly (Drosophila melanogaster) for the first time. We used conditional genetic manipulation of dGCN2 and its downstream effector Drosophila ATF4 (crc; dATF4). In contrast to previous studies, we show that overexpression of dGCN2 and dATF4 significantly reduces lifespan, while knockdown (in vivo RNAi) of dATF4 extends lifespan. We confirmed dATF4 activity was successfully modulated using a fluorescent dATF4 activation reporter. Borrelidin, a tRNA synthetase inhibitor, significantly reduced lifespan in a both dATF4 and diet-dependent manner, independent of microbial load, showing our modulation of dATF4 altered nutrient to ISR signalling. We further conducted long-read RNA sequencing and found that our manipulation of dATF4 changed global transcription in opposite directions, including known ATF4 target genes. Enrichment analysis revealed that dATF4 overexpression may drive metabolic stress, while dATF4 knockdown upregulates proteostasis and DNA repair pathways. Our work reveals that ATF4 exhibits a dual, dose- and context-dependent role in ageing. Chronic dATF4 activation is detrimental in flies, while chronic suppression is pro-longevity. The GCN2-ATF4 pathway thus qualifies as a modifiable control of lifespan with cross-species relevance.

The misclassification of functional genomic loci as pseudogenes has long obscured critical regulators of cellular homeostasis, particularly in aging-related pathways. One such locus, originally annotated as RPL29P31, encodes a 17-kDa protein now redefined as PERMIT (Protein that Mediates ER-Mitochondria Trafficking). Through rigorous experimental validation-including antibody development, gene editing, lipidomics, and translational models-p17/PERMIT has emerged as a previously unrecognized mitochondrial trafficking chaperone. Under aging or injury-induced stress, p17 mediates the ER-to-mitochondria translocation of Ceramide Synthase 1 (CerS1), facilitating localized C18-ceramide synthesis and autophagosome recruitment to initiate mitophagy. Loss of p17 impairs mitochondrial quality control, accelerating neurodegeneration, and sensorimotor decline in both injury and aging models. This Perspective highlights p17 as a paradigm-shifting discovery at the intersection of lipid signaling, mitochondrial biology, and genome reannotation, and calls for a broader reassessment of the "noncoding" genome in aging research. We summarize a rigorous multi-platform validation pipeline-including gene editing, antibody generation, lipidomics, proteomics, and functional rescue assays-that reclassified p17 as a bona fide mitochondrial trafficking protein. Positioned at the intersection of lipid metabolism, organelle dynamics, and genome reannotation, p17 exemplifies a growing class of overlooked proteins emerging from loci historically labeled as pseudogenes, urging a systematic reevaluation of the "noncoding" genome in aging research.

Early detection of cognitive impairment in assisted living is hindered by time intensive tools like MMSE and MoCA. We present a 60-second voice based screening model that analyzes picture descriptions to estimate dementia risk. Using transcripts from the DementiaBank corpus, our model integrates traditional linguistic features (pause rate, pronoun use, syntactic complexity) with latent semantic dimensions extracted from language model embeddings. These semantic axes, interpretable constructs like "Drift & Hesitation" or "Over detailed Narration", consistently emerged as top predictors and may represent novel linguistic biomarkers of early decline. The final ElasticNet classifier is sparse, interpretable, and outperforms known non deep learning baselines (AUC = 0.858), exceeding MMSE. Its simplicity enables deployment in mobile apps or in-room monitors, offering scalable, low burden screening for early dementia. This work supports a shift toward linguistically grounded, tech enabled cognitive care in aging populations.

The nuclear chromatin landscape changes with age. Here, we investigate whether chromatin alterations distinguish also animals with unusual aging rates, focusing on Caenorhabditis elegans with reduced insulin/IGF-like signaling (IIS), i.e., daf-2 mutants. In these animals, enhancer regions that close with age tend to open and become transcriptionally active. We identify LIN-39 as a transcription factor (TF) binding these regions and being required for the longevity of daf-2 mutants. LIN-39 acts during late development in hermaphrodite-specific VC motor neurons - at a time when these undergo maturation. LIN-39-mediated longevity requires DAF-16/FOXO, suggesting cooperation of both TFs in VC neurons to open enhancers. Our findings argue that longevity of daf-2 mutant hermaphrodites relies on a signal emitted by properly matured VC neurons, and due to its essential role in this maturation process LIN-39 becomes a rare example of a development-specific lifespan determinant.

The faithful transmission of genomic DNA over succeeding generations is an essential prerequisite for species maintenance. The germplasm theory by August Weismann has been foundational for the current understanding of heredity; it proposed that genetic inheritance is exclusively mediated by germ cells while they are protecting heritable germline genomes from the phylogenetic influences of an individual's life history. However, recent studies on the inheritance of epigenetic variation have challenged the traditional dogma of heredity and opened new perspectives on molecular mechanisms of inheritance. This review highlights the current knowledge about heritable memories of the ancestral lifestyle and discusses emerging frontiers in soma-germline circuits with a focus on the control of the integrity of heritable genomes as well as their implications for somatic and reproductive aging.

Aging induces substantial structural and functional decline in the retina, yet the molecular drivers of this process remain elusive. In this study, we used heterochronic parabiosis (HP) combined with single-cell RNA sequencing to generate comprehensive transcriptomic profiles of murine retinas from young, aged, and HP pairs, aiming to identify antiaging targets. Our analysis revealed extensive transcriptional alterations across retinal cell types with aging. HP experiments demonstrated that systemic factors from young mice rejuvenated aged retinas and alleviated senescent phenotypes, while aged blood accelerated aging in young mice. Integrative analysis pinpointed adiponectin receptor 1 (AdipoR1) and the downstream adenosine 5'-monophosphate-activated protein kinase (AMPK) signaling pathway as central to the molecular mechanisms underlying retinal rejuvenation. Treatment with the AdipoR1 agonist AdipoRon reversed retinal aging. Mechanistically, AdipoR1-AMPK activation promoted mitochondrial function, contributing to the restoration of youthful cellular phenotypes. Together, our study identifies AdipoR1 as a therapeutic target for retinal aging and provides insights into the molecular programs driving retinal rejuvenation.

Aging is associated with the accumulation of molecular damage, functional decline, increasing disease prevalence, and ultimately mortality. Although our system-wide understanding of aging has significantly progressed at the genomic and transcriptomic levels, the availability of large-scale proteomic datasets remains limited. To address this gap, we have conducted an unbiased quantitative proteomic analysis in male C57BL/6J mice, examining eight key organs (brain, heart, lung, liver, kidney, spleen, skeletal muscle, and testis) across six life stages (3, 5, 8, 14, 20, and 26-month-old animals). Our results reveal age-associated organ-specific as well as systemic proteomic alterations, with the earliest and most extensive changes observed in the kidney and spleen, followed by liver and lung, while the proteomic profiles of brain, heart, testis, and skeletal muscle remain more stable. Isolation of the non-blood-associated proteome allowed us to identify organ-specific aging processes, including oxidative phosphorylation in the kidney and lipid metabolism in the liver, alongside shared aging signatures. Trajectory and network analyses further reveal key protein hubs linked to age-related proteomic shifts. These results provide a system-level resource of protein changes during aging in mice, and identify potential molecular regulators of age-related decline.

Cerebral glucose metabolism (CMRGlc) systematically decreases with advancing age. We sought to identify correlates of decreased CMRGlc in the spectral properties of fMRI signals imaged in the task-free state. Lifespan resting-state fMRI data acquired in 455 healthy adults (ages 18-87 years) and cerebral metabolic data acquired in a separate cohort of 94 healthy adults (ages 25-45 years, 65-85 years) were analyzed. The spectral properties of the fMRI data were characterized in terms of the relative predominance of slow versus fast activity using the spectral slope (SS) measure. We found that the relative proportion of fast activity increases with advancing age (SS flattening) across most cortical regions. The regional distribution of spectral slope was topographically correlated with CMRGlc in young adults. Notably, whereas most older adults maintain a youthful pattern of SS topography, a distinct subset of older adults significantly diverged from the youthful pattern. This subset of older adults also diverged from the youthful pattern of CMRGlc metabolism. This divergent pattern was associated with T2-weighted signal changes in frontal lobe white matter, an independent marker of small vessel disease. These findings suggest that BOLD signal spectral slope flattening may represent a biomarker of age-associated neurometabolic pathology.

Pathogenic germline variants causing excessive telomere shortening may result in bone marrow failure, hematopoietic malignancy, and extramedullary complications, such as pulmonary fibrosis, liver cirrhosis, and solid tumors. Patients with short telomeres also develop immunodeficiency with low CD4+ T cells and impaired general immunosurveillance, particularly against solid neoplasms. We investigated a broad spectrum of lymphocyte subsets and myeloid immune cells from human patients with telomere biology disorders (TBDs) and matched healthy volunteers to understand further how the immune system is affected by telomere dysfunction. We employed mass cytometry (CyTOF) for deep-immunophenotyping peripheral blood mononuclear cells (PBMCs), followed by high-dimensional data analysis. Cytokines, chemokines, and growth factors were assessed in serum. Our results showed profound immune alterations in TBD beyond those observed in aging, with low naïve lymphocytes and thymic hypofunction. We further observed that T helper subsets were markedly skewed, with an inverted TH2/TH1 ratio and low TH17 and TH17.1 levels. T cell activation and exhaustion markers were upregulated, whereas circulating mucosal-associated invariant T (MAIT) cells were significantly decreased and overactivated. Several serum cytokine levels were positively correlated with telomere length and blood counts, suggesting an association with marrow function. In aggregate, these findings suggest a pro-inflammatory profile in TBDs. Our data provide new details on how TBD affects immune cells, particularly lymphocytes, which may contribute to the clinical phenotypes.

Age-related diseases and syndromes result in poor quality of life and adverse outcomes, representing a challenge to healthcare systems worldwide. Several pharmacological interventions have been proposed to target the aging process to slow its adverse effects. The so-called geroprotectors have been proposed as novel molecules that could maintain the organism's homeostasis, targeting specific aspects linked to the hallmarks of aging and delaying the adverse outcomes associated with age. On the other hand, machine learning (ML) is revolutionising drug design by making the process faster, cheaper, and more efficient.

The increase in life expectancy has caused a rise in age-related brain disorders. Although brain rejuvenation is a promising strategy to counteract brain functional decline, systematic discovery methods for efficient interventions are lacking. A computational platform based on a transcriptional brain aging clock capable of detecting age- and neurodegeneration-related changes is developed. Applied to neurodegeneration-positive samples, it reveals that neurodegenerative disease presence and severity significantly increase predicted age. By screening 43840 transcriptional profiles of chemical and genetic perturbations, it identifies 453 unique rejuvenating interventions, several of which are known to extend lifespan in animal models. Additionally, the identified interventions include drugs already used to treat neurological disorders, Alzheimer's disease among them. A combination of compounds predicted by the platform reduced anxiety, improved memory, and rejuvenated the brain cortex transcriptome in aged mice. These results demonstrate the platform's ability to identify brain-rejuvenating interventions, offering potential treatments for neurodegenerative diseases.

Age-related macular degeneration (AMD), a leading cause of vision loss affecting retinal pigment epithelial (RPE) cells, remains largely unexplained by current genome-wide association studies (GWAS) risk variants. Our research on Cryba1, encoding βA3/A1-crystallin protein, reveals its crucial role in RPE cell function via a novel epigenetic mechanism, also evident in human atrophic AMD samples. Loss of Cryba1 in mouse RPE cells triggers epigenetic changes by reducing histone deacetylase 3 (HDAC3) activity through two mechanisms. First, Cryba1 depletion reduces inositol polyphosphate multikinase (IPMK) expression, which potentially reduces inositol hexakisphosphate (InsP6) generation since IPMK's kinase activity is essential for producing InsP4 and InsP5 as precursors to InsP6. Since InsP4, InsP5, or InsP6 is crucial for HDAC3's interaction with the corepressor's DAD domains, reduced IPMK expression in Cryba1-depleted cells likely diminishes the HDAC3-DAD interaction, leading to a reduction in HDAC3's activity. Second, reduced βA3/A1 protein in Cryba1-deficient cells impairs HDAC3's interaction with casein kinase 2 (CK2), resulting in decreased HDAC3 phosphorylation. Collectively, this increases H3K27 acetylation at the RET promoter region, likely enhancing the transcription of RET, a receptor tyrosine kinase critical for cell survival. Although RET is transcriptionally increased, Cryba1 loss disrupts its protein maturation, causing immature RET protein accumulation. This triggers age-dependent endoplasmic reticulum (ER) stress, potentially contributing to the pathogenesis of AMD. Interestingly, although Cryba1 is not identified as an AMD-linked variant in current GWAS, its loss may be linked to AMD mechanisms. These findings underscore the potential of gene-agnostic and epigenetic therapeutic strategies for treating AMD.

Senile osteoporosis (SOP) primarily arises from an imbalance between bone formation and bone resorption. The tightly regulated coupling between osteoblasts and osteoclasts limits the therapeutic efficacy of conventional anti-resorptive agents and anabolic agents. Anti-aging therapy offers a potential strategy to modify the senescent phenotype of bone-associated cells, restore cellular function, and re-establish homeostasis between bone resorption and formation. Calcium-based nanoparticles can effectively deliver therapeutic agents to target sites while simultaneously supplying exogenous calcium. Moreover, restored osteoblast function enhances the cellular capacity to process supplemented exogenous calcium ions, ultimately increasing bone density and further alleviating osteoporosis. In this context, a dual-functional calcium carbonate nanoparticle is engineered. This nanoparticle facilitates the complexation of nicotinamide mononucleotide, enabling targeted delivery to osteoblasts, reversing osteoblast senescence, and restoring their osteogenic function. Simultaneously, through calcium supplementation, the nanoparticle promotes osteoblast differentiation and mineralization. In vitro and in vivo studies have demonstrated the promising therapeutic efficacy of this nanoparticle in treating SOP, providing critical insights for the future development of integrated anti-senescence therapies and calcium supplementation strategies.

Physiological impact of fever in the brain remains poorly understood. Here, we demonstrate that induction of fever by yeast injection in rats (N=9) and by whole-body hyperthermia in mice (N=7) triggers structural synaptic enhancement in the prefrontal cortex involving AMPA-type glutamate receptor signalling and protein translation (N=6). Repeated fever induction in juvenile rats (N=9) results in synaptic strengthening that persists into adulthood, mitigating learning deficits and synaptic loss in a D-galactose model of accelerated aging (N=11). Our results show how common environmental conditions may shape brain function in the long-term via synaptic plasticity, warranting further exploration of thermal treatment for cognitive protection in aging.

During cognitive tasks, older adults often show increased frontoparietal neural activity and functional connectivity. Cognitive reserve accrued from positive life choices like long-term musical training can provide additional neural resources to help cope with the effect of aging. However, the relationship between cognitive reserve and upregulated neural activity in older adults remains poorly understood. In this study, we measured brain activity using functional magnetic resonance imaging during a speech-in-noise task and assessed whether cognitive reserve accumulated from long-term musical training bolsters or holds back age-related increase in neural activity. Older musicians exhibited less upregulation of task-induced functional connectivity than older non-musicians in auditory dorsal regions, which predicted better behavioral performance in older musicians. Furthermore, older musicians demonstrated more youth-like spatial patterns of functional connectivity, as compared to older non-musicians. Our findings show that cognitive reserve accrued through long-term music training holds back age-related neural recruitment during speech-in-noise perception and enlighten the intricate interplay between cognitive reserve and age-related upregulated activity during cognitive tasks.

Accurately quantifying biological age is crucial for understanding the mechanisms of aging and developing effective interventions. Molecular aging clocks, particularly epigenetic clocks that use DNA methylation data to estimate biological age, have become essential tools in this area of research. However, the lack of a comprehensive, publicly accessible database with uniformly formatted DNA methylation datasets across various ages and tissues complicates the investigation of epigenetic clocks. Researchers face significant challenges in locating relevant datasets, accessing key information from raw data, and managing inconsistent data formats and metadata annotations. Additionally, there is a lack of dedicated resources for aging-related differentially methylated sites (DMSs, also named differentially methylated positions or differentially methylated cytosines) and regions (DMRs), which hinders progress in understanding the epigenetic mechanisms of aging. To address these challenges, we developed MethAgingDB, a comprehensive DNA methylation database for aging biology. MethAgingDB includes 93 datasets, with 11474 profiles from 13 distinct human tissues and 1361 profiles from 9 distinct mouse tissues. The database provides preprocessed DNA methylation data in a consistent matrix format, along with tissue-specific DMSs and DMRs, gene-centric aging insights, and an extensive collection of epigenetic clocks. Together, MethAgingDB is expected to streamline aging-related epigenetic research and support the development of robust, biologically informed aging biomarkers.

Aging is frequently perceived negatively due to its association with the decline of various brain and bodily functions. While it is evident that motor abilities deteriorate with age, it is incorrect to assume that all aspects of movement execution are equally affected. The cerebellum, a brain region that is closely involved in motor control among other functions, undergoes clear structural changes with aging. While several studies suggest that cerebellar degeneration causes age related motor control deficits, other studies suggest that the cerebellum might act as a motor reserve and compensate for its structural degeneration, leaving cerebellar motor function intact despite cerebellar degeneration. The present study aims at thoroughly investigating the impact of age on cerebellar function across an array of tasks and domains. We investigated cerebellar motor and cognitive functions across the lifespan by examining 50 young adults (20 to 35 years), 80 older adults (55 to 70 years), and 30 older old adults (over 80 years). Participants completed a test battery comprising seven motor control tasks and one cognitive task, each designed to probe cerebellar function through different paradigms. This multi task approach allowed for a comprehensive evaluation of performance patterns, providing a balanced perspective on cerebellar function across the different age groups. In addition, we analyzed outcomes from the same tasks that, while related to movement, were not specifically linked to cerebellar function. Structural magnetic resonance imaging was also conducted to assess whether cerebellar atrophy was present in the older and older old groups compared to the young. Our results revealed that, despite age-related cerebellar degeneration, cerebellar functions in older adults remained intact compared to young adults, even in adults above 80 years old. In contrast, the sensorimotor measures that were not directly linked to cerebellar function exhibited a clear pattern of decline in older adults, and were further deteriorated in the older-old adults compared to the older adults. These findings indicate that cerebellar motor control functions remain largely preserved with age, providing compelling evidence that the cerebellum possesses a remarkable degree of functional resilience and redundancy. This suggests that cerebellar circuits may be uniquely equipped to preserve function despite structural degeneration.

Intervertebral disc degeneration (IVDD) is a significant contributor to chronic low back pain and disability worldwide, yet effective treatment options remain limited. Through integrative analysis of single-cell RNA-seq data from intervertebral discs (IVDs), we have firstly uncovered that the aberrant accumulation of R-Loops-a type of triple-stranded nucleic acid structure-can result in the cytoplasmic accumulation of double-stranded DNA (dsDNA) and activate cGAS/STING signaling and induce cellular senescence in nucleus pulposus cells (NPCs) during IVDD. Restoring the R-Loop state significantly mitigated both the activation of the cGAS/STING pathway and NPC senescence. Additionally, we identified ERCC5 as a critical regulator of the R-Loop state and cellular senescence. Thus, we developed an NPC-targeting nano-delivery platform (CTP-PEG-PAMAM) to deliver si-Ercc5 to the NP region of the IVDD. This approach aims to modulate the abnormal R-Loop state and inhibit the activation of cGAS/STING signaling in NPCs for IVDD treatment. CTP-PEG-PAMAM demonstrated excellent targeting capability towards NPCs and NP tissue, and achieved effective silencing of the Ercc5 gene without causing systemic organ complications. Both in vitro and in vivo experiments revealed that CTP-PEG-PAMAM-siERCC5 significantly inhibited cGAS/STING signaling activated by aberrant R-Loops, alleviated cellular senescence and promoting cell proliferation, thereby delayed IVDD in a puncture-induced rat model. In conclusion, the ERCC5-R-Loop-cGAS/STING axis in NPCs represents a promising therapeutic target for delaying IVDD, and the designed CTP-PEG-PAMAM/siRNA complex holds great potential for clinical application in the treatment of IVDD.

The Rab3 protein family is composed of a series of small GTP-binding proteins, including Rab3a, Rab3b, Rab3c, and Rab3d, termed Rab3s. They play crucial roles in health, including in brain function, such as through the regulation of synaptic transmission and neuronal activities. In the high-energy-demanding and high-traffic neurons, the Rab3s regulate essential cellular processes, including trafficking of synaptic vesicles and lysosomal positioning, which are pivotal for the maintenance of synaptic integrity and neuronal physiology. Emerging findings suggest that alterations in Rab3s expression are associated with age-related neurodegenerative pathologies, including Alzheimer's disease, Parkinson's disease, and Huntington's disease, among others. Here, we provide an overview of how Rab3s dysregulation disrupts neuronal homeostasis, contributing to impaired autophagy, synaptic dysfunction, and eventually leading to neuronal death. We highlight emerging questions on how Rab3s safeguards the brain and how their dysfunction contributes to the different neurodegenerative diseases. We propose fine-tuning the Rab3s signaling directly or indirectly, such as via targeting their upstream protein AMPK, holding therapeutic potential.

Adaptive modulation of physiological traits in response to environmental variability, particularly dietary fluctuations, is essential for organismal fitness. Such adaptability is governed by complex gene-diet interactions, yet the molecular circuits integrating microbe-derived metabolites with host metabolic and stress response pathways remain less explored. Here, we identify the conserved mechanistic target of rapamycin complex 2 (mTORC2) component, RICTOR, as a critical regulator of dietary plasticity in Caenorhabditis elegans, specifically in response to bacterially derived vitamin B12 (B12). Loss of rict-1, the C. elegans ortholog of RICTOR, confers enhanced osmotic stress tolerance and longevity on B12-rich bacterial diets. These phenotypic adaptations require two B12-dependent enzymes: methionine synthase (METR-1), functioning in the folate-methionine cycle (Met-C), and methylmalonyl-CoA mutase (MMCM-1), a mitochondrial enzyme essential for propionate catabolism. The latter catalyzes the formation of succinyl-CoA, subsequently converted to succinate via the tricarboxylic acid (TCA) cycle. Elevated succinate levels were found to induce mitochondrial fragmentation, thereby activating mitophagy, an autophagic process indispensable for the increased stress resilience and longevity observed in the rict-1 mutants. Crucially, this Met-C-mitophagy axis is modulated by microbial inputs, with B12 and methionine acting as proximal dietary signals. Our findings delineate a mechanistic framework through which RICTOR restrains host sensitivity to microbial-derived metabolites, thus maintaining mitochondrial homeostasis and regulating lifespan. This work reveals a pivotal role for RICTOR in insulating host physiology from environmental nutrient-driven perturbations by modulating organellar quality control pathways.

Background: Aging and male sex are major risk factors for abdominal aortic aneurysm (AAA), a disease characterized by vascular cell phenotypic switching and aortic wall remodeling. Mitochondrial oxidative stress (mtOS) has been implicated in these changes. We previously demonstrated that NOX4 expression and activity increase with age in cardiovascular cells, promoting mtOS and vascular dysfunction. This study investigates whether NOX4-driven mtOS and DNA damage promote AAA development through vascular cell reprogramming. Methods: We used mitochondria-targeted Nox4-overexpressing (Nox4TG) mice with an Apoe-/- background to model Angiotensin II (Ang II)-induced AAA. AAA incidence, aortic morphology, reactive oxygen species (ROS) levels, DNA damage markers, and wall remodeling parameters were assessed in Apoe-/-, Apoe-/-/Nox4TG, and Apoe-/-/Nox4-/- mice. Vascular cell populations were analyzed by spectral flow cytometry and gene expression profiling. In vitro, Ang II-treated SMCs from wild-type, Nox4TG, and Nox4-/- mice were evaluated for mtROS, DNA damage, and activation of inflammatory pathways. Results: Apoe-/-/Nox4TG mice exhibited the highest AAA incidence, aortic dilation, ROS levels, DNA damage, and inflammation, while Apoe-/-/Nox4-/- mice were most protected. Macrophage-like SMCs increased, while contractile SMCs decreased in Nox4TG aortas. Ang II-treated Nox4TG SMCs showed elevated mtROS, DNA damage, and cGAS-STING activation. Flow cytometry analysis confirmed the presence of aneurysmal SMC with reduced ACTA2, MYH11, TAGLN and increased CD68, CD11b, LGALS3 expression. Conclusions: NOX4-dependent mitochondrial DNA damage and activation of DNA-sensing pathways promote SMC phenotypic switching, inflammation, and aortic wall remodeling in AAA. Targeting NOX4 and enhancing mitochondrial function may offer therapeutic strategies for AAA prevention.

Epigenetic clocks have been widely applied to assess biological ageing, with Age Acceleration (AA) serving as a key metric linked to adverse health outcomes, including mortality. However, the comparative predictive value of AAs derived from different epigenetic clocks for mortality risk has not been systematically evaluated. In this retrospective cohort study based on 1,942 NHANES participants (median age 65 years; 944 women), we examined the associations between AAs from multiple epigenetic clocks and the risks of all-cause, cancer-specific, and cardiac mortality. Restricted cubic spline models were used to assess the shape of these associations, and Cox proportional hazards regression was employed to quantify risk estimates. Model performance was compared using the Akaike Information Criterion (AIC) and concordance index (C-index). Our findings revealed that only GrimAge AA and GrimAge2 AA demonstrated approximately linear and positive associations with all three mortality outcomes. Both were significantly associated with increased risks of death, and these associations were consistent across most subgroups. GrimAge and GrimAge2 AAs showed very similar performance in predicting all-cause, cancer and cardiac mortality, with only small differences in AIC values and C-index scores. These findings suggest that both GrimAge and GrimAge2 are effective epigenetic biomarkers for mortality risk prediction and may be valuable tools in future ageing-related research.

Aging-related cognitive decline is associated with changes across different tissues and the gut microbiome, including dysfunction of the gut-brain axis. However, only few studies have linked multi-organ alterations to cognitive decline during aging. Here we report a multi-omics analysis integrating metabolomics, transcriptomics, DNA methylation, and metagenomics data from hippocampus, liver, colon, and fecal samples of mice, correlated with cognitive performance in the Barnes Maze spatial learning task across different age groups. We identified 734 molecular features associated with cognitive rank within individual data layers, of which 227 features remain when integrating all data layers with each other. Among the single-layer predictors, several host and microbial features were highlighted, with host-associated markers being predominant. Host features associated with cognitive function mainly belong to innate and adaptive inflammatory activity (inflammaging) and developmental processes. Our findings suggest that cognitive decline in aging is tightly coupled to systemic, age-associated inflammation, potentially initiated by microbiome-driven gastrointestinal inflammatory activity, emphasizing a link between peripheral tissue alterations and brain function.

Oocyt e development from non-growing to metaphase II (MII) stages is largely dependent on timely and correctly controlling gene expression. During the process of biological or postovulatory aging, the epigenetic mechanisms, particularly DNA methylation, histone methylation, and acetylation, exhibit notable changes in oocytes at various stages of development. These changes mainly result from altered expression of the related catalytic enzymes. In this review, changes in DNA methylation, histone methylation, and acetylation marks and expression of the acting enzymes in aging mammalian oocytes have been comprehensively evaluated in the light of existing studies. Potential interactions between these epigenetic mechanisms are also discussed. Finally, possible interventions to regulate them in order to mitigate the loss of female fertility in the later periods of the reproductive lifespan are reviewed.