Evidence for reduced choroid plexus volume in the aged brain
Abstract
BackgroundThe choroid plexus plays an important role in brain homeostasis, including the active secretion of cerebrospinal fluid. Its function and structure have been reported to be affected by normal ageing. However, existing measures of choroid plexus volume may be complicated by partial volume (in vivo MRI) and tissue fixation artefacts (histology). In this study, we investigate possible changes in choroid plexus volume within the lateral ventricles of aged mice utilising two structural MRI protocols explicitly designed for time-efficient, high-resolution in vivo imaging of the choroid plexus.
MethodsTwo MRI sequences were utilised to examine in vivo choroid plexus volume in the lateral ventricles of young ([~]6 months) and aged ([~]24 months) mouse brains: 1) an ultra-long echo-time T2 weighted fast-spin-echo and 2) a multi-TE T2* mapping protocol. A test-retest study was performed on a subset of the data to examine the reproducibility of choroid plexus volume estimation. A two-way ANOVA test was performed to determine possible differences in choroid plexus volume in young and aged mouse groups across the two distinct MRI protocols.
ResultsReproducibility tests showed a low test-retest variability of the manual segmentation pipeline for both MRI protocols. A statistically significant reduction of in vivo choroid plexus volume was found in the aged mouse brain. This finding is concordant with previous histology studies that have observed a reduction in epithelial cell height with ageing across a wide range of species.
ConclusionsWe present an in vivo investigation of changes to lateral ventricle choroid plexus volume in the mouse brain utilising a manual segmentation approach based on two bespoke MRI protocols designed for time-efficient high resolution imaging of the choroid plexus. Furthermore, based on these protocols, we provide evidence for a reduction in choroid plexus volume in the aged brain. This research provides insight for studies utilising MRI measurements of choroid plexus volume as a biomarker of age-related neurologic conditions as it indicates that the ageing process itself does not result in hypertrophy of the choroid plexus, but a decrease in tissue volume.
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Research summary
The paper investigates structural changes in the choroid plexus associated with aging, which is relevant to understanding the biological mechanisms of aging. However, it primarily focuses on a specific anatomical change rather than addressing root causes of aging or proposing interventions for lifespan extension. The findings contribute to the field by providing insights into age-related changes in brain structure, but the impact is limited as it does not propose significant advancements or breakthroughs in longevity research.
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