Biotech Startup Says Mice Live Longer After Genetic Reprogramming

An anonymous reader quotes a report from MIT Technology Review: A small biotech company claims it has used a technology called reprogramming to rejuvenate old mice and extend their lives, a result suggesting that one day older people could have their biological clocks turned back with an injection -- literally becoming younger. The life-extension claim in rodents, made by Rejuvenate Bio, a San Diego biotech company, appears in a preprint paper on the website BioRxiv and hasn't been peer reviewed. Noah Davidsohn, chief scientific officer of Rejuvenate, says the company used gene therapy to add three powerful reprogramming genes to the bodies of mice that were equivalent in age to human 77-year-olds. After the treatment, their remaining life span was doubled, the company says. Treated mice lived another 18 weeks, on average, while control mice died in nine weeks. Overall, the treated mice lived about 7% longer. Although the increase in lifespan was modest, the company says the research provides a demonstration of age reversal in an animal. "This is a powerful technology, and here is the proof of concept," says Davidsohn. "I wanted to show that it's actually something we can do in our elderly population." Scientists not connected to the company called the study an exciting landmark but cautioned that whole-body rejuvenation using gene therapy remains a poorly understood concept with huge risks. "It's a beautiful intellectual exercise, but I would shy away from doing anything remotely similar to a person," says Vittorio Sebastiano, a professor at Stanford University. One risk is that the powerful programming process can cause cancer. Such an effect is often seen in mice. Even so, the chance that reprogramming could be an elixir of youth has led to a research and investment boom. One company, Altos Labs, says it has raised over $3 billion. "Far more information will be needed to learn exactly what changes the reprogramming genes cause in the mice, and researchers say other groups will need to repeat the experiment before they are convinced," adds the report. "Sebastiano says the life-extension effect reported by Rejuvenate could be due to changes in a single organ or group of cells, rather than a general mouse-wide rejuvenation effect. Among other shortfalls in its research, Rejuvenate did not carefully document which and how many cells were changed by the genetic treatment."

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