Can you rejuvenate an old brain by giving it young immune cells? (Calico)





BioRxiv paper:

https://www.biorxiv.org/content/10.1101/2025.09.02.673859v1

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If NK cells are a driver of brain aging, and mTORC1 inhibition suppresses NK development, this is potentially a mechanism for rapamycin improving brain aging despite not crossing BBB, @adssx.

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We haven’t heard much from Calico, but this makes up for it - both in the nature of the discovery and the vow of future openness.