A Surge In Endogenous Spermidine Is Essential For Rapamycin-Induced Autophagy And Longevity

Research Summary

An experimental study on how rapamycin produces its effects on autophagy — the cell’s recycling process — and on lifespan.

Who Or What Was Studied?

Yeast, nematodes, flies and mice, alongside human data showing that fasting raises spermidine levels.

What Did The Research Show?

• Fasting raises spermidine in yeast, flies, mice and humans.
• Rapamycin-driven autophagy and lifespan extension depend on a similar surge in endogenous spermidine.
• Blocking that surge removes the pro-autophagy and anti-ageing effects in yeast, nematodes, flies and mice.

Limitations And Interpretation

• These are model-organism experiments: the findings describe a mechanism, not a clinical outcome.
• They do not show that either spermidine or rapamycin extends healthy lifespan in people.