Restore Youthfulness & Vitality to the Aging Brain & Body | Dr. Tony Wyss-Coray

Dr. Andrew Huberman welcomes Dr. Tony Wyss-Coray, a professor of neurology at Stanford School of Medicine and an expert in factors that can prevent and reverse organ aging. The discussion centers on Dr. Wyss-Coray's groundbreaking research into factors present in young blood and in blood after exercise, which have been shown to rejuvenate the brain and other tissues in older individuals. His lab has identified specific proteins that are abundant in youth but diminish with age, and supplying these to an aged body and brain can reverse key features of aging, including improving cognition and tissue recovery from stress and damage.

The episode delves into the concept of aging as a nonlinear process, explaining that it doesn't progress uniformly across the lifespan but rather exhibits accelerated phases during periods like puberty, early 40s, and early 60s. They also discuss how different organs within the body age at varying rates, a phenomenon measurable through specific molecular tools. Dr. Wyss-Coray elaborates on his early work using parabiosis, a surgical model where old and young mice share circulation. This research, initially explored by Tom Rando for muscle stem cell aging, revealed that young blood factors reactivated stem cells in old mouse brains, reduced inflammation, increased neural activity, and significantly improved memory function.

The conversation extends to the translation of this science to humans. Dr. Wyss-Coray co-founded Alkahest to investigate if human young blood factors could mimic these effects in mice. He then collaborated with Griffols, a company that processes donated plasma into clinical medicines, to test different plasma fractions. These efforts led to small, promising clinical trials in patients with Alzheimer's and Parkinson's disease. Notably, Griffols conducted a blinded, placebo-controlled study in 500 Alzheimer's patients using therapeutic plasma exchange combined with albumin infusion, observing "clear significant benefits." Further trials by companies like Circulate Therapeutics in 40 healthy older individuals using epigenetic clocks also indicated that some organs appeared biologically younger with slight functional improvements.

A key insight shared is that bloodborne factors act in a multifaceted way: both by counteracting detrimental inflammatory proteins that accumulate with age and by supplying beneficial "pro-growth factors" that stimulate cell activity and maintain stem cells. The challenge remains to identify the most crucial factors to formulate an "amplified cocktail" that mimics nature's own "fountain of youth." The discussion also touches upon the ability to measure thousands of proteins (e.g., 11,000) in a drop of blood to estimate the age of specific organs, revealing that while most organs age in sync, individual organs can age at different rates than the rest of the body.