L-threonine mediated DAF-16/HSF-1 activation inhibits ferroptosis and increases healthspan

Kim, J.; Jo, Y.; Cho, D.; Ryu, D.

doi:10.1101/2022.01.24.477604

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bioRxiv · 10.1101/2022.01.24.477604

L-threonine mediated DAF-16/HSF-1 activation inhibits ferroptosis and increases healthspan

Kim, J.·Jo, Y.·Cho, D.·Ryu, D.

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Abstract

The pathways that impact longevity in the wake of dietary restriction (DR) pathway remain still ill-defined. Most studies have focused on nutrient limitation and perturbations of energy metabolism to explain the beneficial effects of DR. We showed that the essential amino acid L-threonine was elevated in Caenorhabditis elegans under DR, and that L-threonine supplementation increased its healthspan. To elucidate the underlying mechanism, we conducted metabolic and transcriptomic profiling using LC-MS/MS and RNA-seq analyses in worms that were fed with RNAi to induce loss of function of key candidate mediators and evaluated healthspan. L-threonine supplementation and loss-of-threonine dehydrogenase, which govern L-threonine metabolism, increased the healthspan of C. elegans by attenuating ferroptosis in a ferritin-dependent manner. Tran-scriptomic analysis of C. elegans supplemented with L-threonine showed that FTN-1 encoding ferritin was elevated, implying FTN-1 is an essential mediator of longevity promotion through L-threonine. Organismal ferritin levels were positively correlated with chronological aging and L-thre-onine supplementation further increased ferritin levels, which protected against age-associated ferroptosis through the DAF-16 and HSF-1 pathways. Our investigation uncovered the role of a distinct and universal metabolite, L-threonine, in DR-mediated improvement in organismal healthspan, suggesting it could be an effective intervention for preventing senescence progression and age-induced ferroptosis.

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Kim, J., Jo, Y., Cho, D., Ryu, D.. 2022-01-25. L-threonine mediated DAF-16/HSF-1 activation inhibits ferroptosis and increases healthspan. https://doi.org/10.1101/2022.01.24.477604

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