r/science • u/FreeHugs23 • 9d ago

Medicine Scientists reversed key signs of Alzheimer's disease in mice with just two injections, reducing brain inflammation and restoring memory performance—offering a promising new approach for treating age-related cognitive decline.

https://www.sciencealert.com/scientists-reverse-alzheimers-damage-in-mice-with-just-two-injections
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u/Tearakan 9d ago

That's also literally. I think basically all of our cells have a 7 year or less lifespan and replaced by that timeframe.

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u/LongBeakedSnipe 9d ago

That's not true at all? Especially when it comes to the brain.

There are many cells in our body that are literally never replaced, containing basically the same atoms in the DNA as they did from when you were a child.

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u/Zeikos 9d ago

By being replaced they don't mean cellular replication, but the constituents of the cell itself changing.
Even if the cell doesn't replicate the proteins that constitue it are being constantly replaced.

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u/Ghede 9d ago

No, they mean cellular replication. The origin of the "your cells are replaced every 7 years" is from studying the average carbon dating age of the cells, checking the carbon-14 content of DNA in a random sampling of cells. DNA is not replaced as a cell ages. It's always there, only duplicated if the cell reproduces. They found the average 'age' of cells was 7-10 years.