R. J. Rylett

The inaugural Canadian Conferences on Translational Geroscience were held as two complementary sessions in October and November 2023. The conferences explored the profound interplay between the biology of aging, social determinants of health, the potential societal impact of geroscience and the maintenance of health in aging individuals. Although topics such as cellular senescence, molecular and genetic determinants of aging and prevention of chronic disease were addressed, the conferences went on to emphasize practical applications for enhancing older people's quality of life. This manuscript summarizes the proceeding and underscores the synergy between clinical and fundamental studies. Future directions highlight national and global collaborations and the crucial integration of early-career investigators. This work charts a course for a national framework for continued innovation and advancement in translational geroscience in Canada.

The E4 allele of apolipoprotein E (ApoE4) is a key genetic risk factor for late‐onset Alzheimer's disease (AD), increasing the risk of developing the disease by up to three‐fold. However, the mechanisms by which ApoE4 contributes to AD pathogenesis are poorly understood. Here, we utilize a mouse model expressing either human ApoE3 or human ApoE4 to examine the effects of the E4 allele on a wide range of genetic and molecular pathways that are altered in early AD pathology. We demonstrate that ApoE4‐expressing mice begin to show early differential expression of multiple genes, leading to alterations in downstream pathways related to neural cell maintenance, insulin signaling, amyloid processing and clearance, and synaptic plasticity. These alterations may result in the earlier accumulation of pathological proteins such as β‐amyloid that may build up within cells, leading to the accelerated degeneration of neurons and astrocytes as observed in ApoE4‐positive individuals. We also examine the metabolic effects associated with a high‐fat diet (HFD) in male ApoE4‐expressing mice compared with regular chow diet (RD) fed mice at different ages. We found that young ApoE4‐expressing mice fed HFD developed metabolic disturbances, such as elevated weight gain, blood glucose, and plasma insulin levels that cumulatively have been observed to increase the risk of AD in humans. Taken together, our results reveal early pathways that could mediate ApoE4‐related AD risk and may help identify more tractable therapeutic targets for treating ApoE4‐associated AD. image