David Sinclair Profile picture
Professor at Harvard Med. School, researching why we age & how to combat it. Author of Lifespan. Mission: Extend healthy life for all. Views are his own 🙏✌️
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Oct 29 7 tweets 2 min read
Effect of longevity interventions on epigenetic clocks:

Strongest:
1. Arthritis therapy/anti-TNFa
2. Metformin
3. HBOT
4. AC-11
5. Bypass
6. Ketamine
7. Vegan/Mediterranean

No effect:
1. Rapamycin
2. Omegas
3. Exercise
4. Vitamin B
5. CR/IF
6. Ozempic
7. Follistatin
More ⬇️ Image DNA methylation (DNAme) age reductions. Red asterisks represent statistical significance
* P<0.05; ** 0.01; *** 0.001 Image
Oct 23 13 tweets 6 min read
Luteolin is a molecule found in cannabis & some vegetables. New study says it may bind to the NAD-dependent SIRT1 enzyme to activate protein recycling, thereby protecting rats from arterial calcification🫀


But is luteolin safe in humans? … 🧵 tinyurl.com/2an7vfcdImage Luteolin, a polyphenols, is found in small quantities in many plants and plant products we eat, such as mint, tomatoes, celery, broccoli, artichoke, oranges, parsley, thyme, rosemary and even honey… Image
Sep 22 7 tweets 2 min read
Exciting! Belmonte lab reports OSK-reprogramming of old (p16+) cells increases wound healing & the lifespan of mice without causing cancer. Bodes well for human trials @lifebiosciences beginning next year 🚀🧵 tinyurl.com/249f3tpm
Image The Belmonte lab has been a leader in the reprogramming field since they showed OSKM could improve health and extend the lifespan of a prematurely aging LMNA mouse strain. Here they reprogram senescent cells of these and normal mice and show it safely extends lifespan 🐁 Amazing…Image
Aug 20 9 tweets 2 min read
Restricting calories by 12% significantly slows the rate of human aging 🥗⏰ 🧵 nature.com/articles/s4358…
Image A custom DNA methylation lock was created to measure the biological aging of CALERIE trial subjects
Aug 3 12 tweets 4 min read
Leonard Hayflick, the scientist who discovered the cellular replication limit and a pioneer in aging research, has died. I remember him fondly as a kind man who faced much criticism for his radical ideas about aging… 🧵 Image Dr. Hayflick discovered the Hayflick limit: that normal human cells have a finite number of divisions before they stop. This challenged the then-prevailing belief that cells could divide indefinitely Image
Aug 3 16 tweets 6 min read
Exciting new research shows retrotransposons, ancient viruses making up ~1/2 our DNA, can create precise biological clocks to measure our rate of aging. This is the tip of the iceberg… 🧵 Image In the 1940s, Barbara McClintock discovered that retrotransposons, or “jumping genes,” cause color variety in corn by moving within the genome and disrupting pigment genes, earning her the Nobel Prize in 1983 🌽🥇 Image
Jul 26 8 tweets 4 min read
Exciting preprint from @OcampoLab which “strongly supports the concept that loss of epigenetic information directly drives the aging process” and altering this “could potentially slow down or reverse age-related decline.” 🧵 tinyurl.com/3xkmtbbd
Background: DNA is wrapped around proteins called histones. Tight bundling of histones turns genes OFF, and loose bundling tends to turn them on. Bundling is mediated, in part, by the addition and subtraction of chemicals on histones such as methyls (note: shorthand for 3 methyls stuck on amino acid #9 of histone 3 is “K9me3”) - stick with it…Image
Jul 23 24 tweets 3 min read
Landmark speech in UK’s House of Lords yesterday:

“By becoming the first country to treat ageing as a medical condition, we can chart a course for more effective interventions and improved health outcomes.”

Transcript below
@mrevgenylebedev
tinyurl.com/uu26htsv
@mrevgenylebedev "I want to turn the attention of your Lordship’s House to an emerging field which can unlock huge benefits for our society and economy: longevity research
Jul 18 9 tweets 3 min read
A new paper has lit up the longevity field. Removal of interleukin-11 improves health and extends mouse lifespan by up to 24%. Human therapies are being developed 🧵 nature.com/articles/s4158…
Image IL-11 is a cytokine, a type of signaling protein secreted by the immune system that plays various roles in inflammation, immune responses, and the formation of blood cells Image
Jun 12 5 tweets 3 min read
A fascinating study of over 348 mammalian species reveals that patterns of a chemical on DNA called "methylation" can predict a species' gestation time & maximum lifespan. Could these epigenetic differences explain why mice live 2.5 years, humans 80, and whales 200, and can they be altered?🧬🧵
science.org/doi/epdf/10.11…Image The study included data from 93 dog breeds including the Great Dane (6.3 years) and Toy Poodle (14.6 years)... Image
May 30 4 tweets 2 min read
Since the 1970s, indole-3-carbinol (I3C), a compound found in broccoli, has been studied for its anti-tumor activity. New work shows it enhances the diversity of the mouse microbiome, reduces levels of a toxic metabolite from meat (TMAO), and protects mice from atherosclerosis (50–100 mg/kg body weight/day). Super interesting 🤔
tinyurl.com/33kvz5e3Image I3C triggers DNA repair, cell-cycle arrest, apoptosis, disruption of cell migration, and modulates hormone receptor signaling Image
May 19 12 tweets 7 min read
After only 6 weeks, blood from a young mouse reversed the effects of aging on blood vessel density in the brains of old mice & restored the blood-brain barrier, while old blood made the young brains worse 🧠<🩸>🧠
The effect is reminiscent of what the same lab saw in old mice treated for 2 weeks with the NAD precursor NMN. Congrats Zoltan Ungvari, Anna Csiszar, Rafal Gulej & team 👏🏻
New paper:
NMN paper:
1/12...tinyurl.com/auh2cww9
tinyurl.com/44m9abm4Image Young blood has been shown to enhance cognitive function, stem cell function, and tissue repair, as well as increase the lifespan of rodents. Check out the amazing work by Irina and Michael Conboy's labs (pictured below)


Researchers speculate that several proteins and factors in young blood contribute to its rejuvenating effects, including GDF11, TIMP2, VEGF & microRNAs 2/12nature.com/articles/ncomm…
conboylab.berkeley.edu/about-us/princ…Image
Jan 25 8 tweets 3 min read
New study finds immune T cells engineered to kill zombie senescent cells 🧟‍♀️ can reverse key aspects of aging in mice 🐁 including metabolic & physical decline. Imagine a single treatment that protects from aging, for life…see thread nature.com/articles/s4358…
Image CAR T-cell therapy, short for Chimeric Antigen Receptor T-cell therapy, is a type of treatment in which a patient’s immune T cells are changed in the laboratory so they will attack cancer cells or, in this case, senescent cells that cause aging
Dec 15, 2023 15 tweets 6 min read
“The Information Theory of Aging” was published today. Free copy @NatureAging rdcu.be/dtGSC
Image The “ITOA” states that a cause of aging is a loss of epigenetic information that disrupts the ability of cells to read the right genes, causing them to lose their identity and malfunction… Image
Dec 13, 2023 9 tweets 3 min read
400 million people are allergic to dust mites, which feed on skin flakes in beds & carpets. When mice were exposed to mite allergens, the NAD booster NMN reduced airway inflammation & mucus. Trials of NMN against allergies & asthma are warranted 🤧 See thread… Image Here’s the primary paper:
sciencedirect.com/science/articl…
Nov 29, 2023 14 tweets 6 min read
Our latest paper adds to the scientific discussion on the role of sirtuins in aging. There been some confusion about the implications.
Here’s the scoop:

onlinelibrary.wiley.com/doi/full/10.11…
Image 1. From 1994-2005, the budding-yeast “silent information regulator #2” or “SIR2” gene was shown to extend lifespan & mediate lifespan extension due to hormetic biostressors e.g. heat, low aminos & calorie restriction…



m.genesdev.cshlp.org/content/13/19/…
nature.com/articles/natur…
Image
Nov 9, 2023 6 tweets 2 min read
Isoleucine is an essential amino acid which, in excess, counters the health benefits of the mTOR longevity pathway. The @LammingLab is reporting that an isoleucine-restricted diet extends the lifespan of mice by 33% 👏 @Cell_Metabolism Image Here a link to the paper…cell.com/cell-metabolis…
Oct 9, 2023 10 tweets 4 min read
New study shows people with increased iron blood markers tend to have older epigenetic ages. Another piece of evidence that high iron levels probably accelerate aging… 1/n tinyurl.com/zhy72aun
Image More and more scientists suspect that high iron levels probably cause normal cells to age faster and ultimately become senescent zombie cells 🧟‍♀️. We know for sure that a common feature of senescent cells is their high iron content Image
Jul 12, 2023 10 tweets 4 min read
Grateful to share our latest publication: We’ve previously shown age reversal is possible using gene therapy to turn on embryonic genes. Now we show it’s possible with chemical cocktails, a step towards affordable whole-body rejuvenation 1/17 aging-us.com/article/204896… For over three years, the team @harvardmed has worked long hours searching for molecules that, in combination, reverse cellular aging & rejuvenate senescent human cells 👏 C1-6 are the cocktails below vs age 2/17
Jun 30, 2023 6 tweets 2 min read
Aspartame in diet sodas, gum and some Snapple drinks will be listed by @WHO as "possibly carcinogenic to humans," while a new study indicates another popular sweetener, Splenda, causes damage to DNA and the gut. Read on… Articles:
Sucralose

Aspartame:
https://t.co/JL4DwPSLmUtandfonline.com/doi/full/10.10…
msn.com/en-us/money/co…
Jun 11, 2023 7 tweets 3 min read
A nightmare substance would be one that, in low doses, protects the heart, but is toxic to the brain. According to research in the last few years, that substance is alcohol… 🍷 tinyurl.com/3kru67hn Image Long-term drinking also induces changes in neurotransmitter systems that ultimately lead to the development of craving and alcohol-seeking behavior ncbi.nlm.nih.gov/pmc/articles/P… Image