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    Breaking News

    Researchers Connect Gut Microbiome to Healthy Aging

    Data from over 9,000 people show distinct gut microbiome signature associated with healthy aging and survival in latter decades of life.

    Researchers Connect Gut Microbiome to Healthy Aging
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    Sean Moloughney, Editor02.23.21
    New research published in the journal Nature Metabolism identified distinct signatures in the gut microbiome that have been associated with healthy or unhealthy aging trajectories, which in turn predict survival in a population of older individuals.
     
    Understanding of the gut microbiome continues to be a hot topic among scientists, though its importance in the human aging process isn’t entirely clear.
     
    In this study, a research team from the Institute for Systems Biology (ISB), a non-profit scientific research organization located in Seattle, along with collaborators, analyzed gut microbiome, phenotypic and clinical data from over 9,000 people between the ages of 18 and 101 years old across three independent cohorts. The team focused, in particular, on longitudinal data from a cohort of over 900 community-dwelling older individuals (78-98 years old), allowing them to track health and survival outcomes.
     
    Data showed that gut microbiomes became increasingly unique (divergent from others) as individuals aged, starting in mid-to-late adulthood, which corresponded with a steady decline in the abundance of core bacterial genera (e.g., Bacteroides) that tend to be shared across humans.
     
    While microbiomes became increasingly unique to each individual in healthy aging, the metabolic functions the microbiomes were carrying out shared common traits, researchers noted. This gut uniqueness signature was highly correlated with several microbially-derived metabolites in blood plasma, including one (tryptophan-derived indole) that has previously been shown to extend lifespan in mice. Blood levels of another metabolite (phenylacetylglutamine) showed the strongest association with uniqueness, and prior work has shown that this metabolite is indeed highly elevated in the blood of centenarians.
     
    “Interestingly, this uniqueness pattern appears to start in mid-life—40-50 years old—and is associated with a clear blood metabolomic signature, suggesting that these microbiome changes may not simply be diagnostic of healthy aging, but that they may also contribute directly to health as we age,” said ISB Research Scientist Dr. Tomasz Wilmanski, who led the study. For example, indoles are known to reduce inflammation in the gut, and chronic inflammation is thought to be a major driver in the progression of aging-related morbidities.
     
    “Prior results in microbiome-aging research appear inconsistent, with some reports showing a decline in core gut genera in centenarian populations, while others show relative stability of the microbiome up until the onset of aging-related declines in health,” said microbiome specialist Dr. Sean Gibbons, co-corresponding author of the paper. “Our work, which is the first to incorporate a detailed analysis of health and survival, may resolve these inconsistencies. Specifically, we show two distinct aging trajectories: 1) a decline in core microbes and an accompanying rise in uniqueness in healthier individuals, consistent with prior results in community-dwelling centenarians, and 2) the maintenance of core microbes in less healthy individuals.”
     
    This analysis highlights the fact that the adult gut microbiome continues to develop with advanced age in healthy individuals, but not in unhealthy ones, and that microbiome compositions associated with health in early-to-mid adulthood may not be compatible with health in late adulthood.
     
    This research project was conducted by ISB and collaborators from Oregon Health and Science University, University of California San Diego, University of Pittsburgh, University of California Davis, Lifestyle Medicine Institute, and University of Washington. It was supported in part by a Catalyst Award in Healthy Longevity from the National Academy of Medicine, and the Longevity Consortium of the National Institute on Aging.
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