Inflammaging is driven by upregulation of innate immune receptors and systemic interferon signaling and is ameliorated by dietary restriction

Highlights•Innate immune system receptors/interferon/Stat1 axis triggers inflammaging•Both lifetime and short-time dietary restriction (DR) treatments ameliorate inflammaging•Transcriptome alteration caused by aging, lifetime, or short-term DR are tissue specific•Aging induces a general open chromatin rearrangement, which is not rescued by DRSummaryAging is characterized by a chronic low-grade inflammation known as inflammaging in multiple tissues, representing a risk …

Continue reading Inflammaging is driven by upregulation of innate immune receptors and systemic interferon signaling and is ameliorated by dietary restriction

Long-lasting geroprotection from brief rapamycin treatment in early adulthood by persistently increased intestinal autophagy

The licensed drug rapamycin has potential to be repurposed for geroprotection. A key challenge is to avoid adverse side effects from continuous dosing. Here we show that geroprotective effects of chronic rapamycin treatment can be obtained with a brief pulse of the drug in early adulthood in female Drosophila and mice. In Drosophila, a brief, early rapamycin treatment …

Continue reading Long-lasting geroprotection from brief rapamycin treatment in early adulthood by persistently increased intestinal autophagy

Association of Leisure Time Physical Activity Types and Risks of All-Cause, Cardiovascular, and Cancer Mortality Among Older Adults

Higher amounts of physical activity are associated with increased longevity. However, whether different leisure time physical activity types are differentially associated with mortality risk is not established.Objectives To examine whether participation in equivalent amounts of physical activity (7.5 to <15 metabolic equivalent of task [MET] hours per week) through different activity types is associated with …

Continue reading Association of Leisure Time Physical Activity Types and Risks of All-Cause, Cardiovascular, and Cancer Mortality Among Older Adults

Gut bacterial isoamylamine promotes age-related cognitive dysfunction by promoting microglial cell death

The intestinal microbiome releases a plethora of small molecules. Here, we show that the Ruminococcaceae metabolite isoamylamine (IAA) is enriched in aged mice and elderly people, whereas Ruminococcaceae phages, belonging to the Myoviridae family, are reduced. Young mice orally administered IAA show cognitive decline, whereas Myoviridae phage administration reduces IAA levels. Mechanistically, IAA promotes apoptosis …

Continue reading Gut bacterial isoamylamine promotes age-related cognitive dysfunction by promoting microglial cell death

Loss of functional heterogeneity along the CA3 transverse axis in aging

Age-related deficits in pattern separation have been postulated to bias the output of hippocampal memory processing toward pattern completion, which can cause deficits in accurate memory retrieval. Although the CA3 region of the hippocampus is often conceptualized as a homogeneous network involved in pattern completion, growing evidence demonstrates a functional gradient in CA3 along the …

Continue reading Loss of functional heterogeneity along the CA3 transverse axis in aging