Peter Attia MD281 ‒ Longevity drugs, aging biomarkers, and updated findings from the Interventions Testing Program
At a glance
WHAT IT’S REALLY ABOUT
Richard Miller Details ITP Mouse Findings, Aging Rate Indicators, and Failed Drugs
- Miller describes the ITP as a three-site, roughly $4.5 million per year NIA program that uses genetically heterogeneous UM-HET3 mice, pre-specified statistics, and drug-in-food dosing to screen candidate anti-aging drugs.
- Rapamycin, 17α-estradiol, acarbose and canagliflozin extend mouse lifespan even when started in middle age, with striking sex differences partly tied to drug blood levels, and rapamycin plus acarbose gave a 29% median lifespan increase in males.
- Miller proposes aging rate indicators as a 'speedometer' of aging, 13 changes seen in all slow-aging mice (including UCP1, GPLD1, irisin/FNDC5, BDNF, and fat macrophage shifts), and argues proteomics matter because mRNA explains only about 30% of age-related protein change.
- Resveratrol, metformin and nicotinamide riboside failed to extend mouse lifespan, and fisetin neither extended lifespan nor reduced senescent cell markers, while meclizine and astaxanthin are new over-the-counter hits in males.
- Miller hopes aging rate indicators can pre-screen drugs, be bridged to human plasma markers, and that cognition testing and tissue sharing will build the case that these drugs slow aging broadly.
IDEAS WORTH REMEMBERING
5 ideasGenetically heterogeneous mice give more trustworthy results than inbred strains
Miller says the standard B6 mouse is a single, inbred, often sick genotype, so a drug's effect there may not generalize; UM-HET3 mice provide reproducible heterogeneity and also allow gene mapping.
Lifespan-extending drugs can work even when started late
Rapamycin started at 20 months worked as well as when started young, and 17α-estradiol, acarbose and canagliflozin also worked from middle age, suggesting that some aging processes remain drug-sensitive late in life.
Sex-specific effects often trace back to drug exposure
Blood levels of rapamycin and canagliflozin were about threefold higher in female mice, which may explain differing responses, though Miller notes this is not proven; acarbose, mostly staying in the gut, is a different case.
Aging rate indicators measure speed of aging, not accumulated age
Miller uses a speedometer analogy: these markers change in the same direction in every slow-aging mouse, even in young adults, and could screen drugs far more cheaply than lifespan studies if they respond quickly.
Transcript data alone can mislead because protein levels are shaped post-transcriptionally
Churchill and Korstanje's work found only about 30% of age-related protein changes matched mRNA changes, and Miller points to cap-independent translation, degradation and sequestration as other controls.
WORDS WORTH SAVING
5 quotesIf you had a cure for cancer in people, no one over the age of 50 ever got cancer again, median lifespan of humans would go up by 3%.
— Richard Miller
Not only incomplete, but mostly wrong.
— Richard Miller
aging rate indicators by this analogy are the speedometer. They tell you how quickly you're aging and not how far you've gone.
— Richard Miller
It's like lemmings. You follow the lemming in front of you because that's just how lemmings do it. They don't look at a roadmap or think about the optimal path to take.
— Richard Miller
People are very easy to fool. It's easy to come up with eight or 10 things that people believe because they read them on the internet
— Richard Miller
High quality AI-generated summary created from speaker-labeled transcript.
