Inhibition of a eukaryotic initiation factor (eIF2Bdelta/F11A3.2) during adulthood extends lifespan in Caenorhabditis elegans

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
Daisuke TohyamaToshihide Yamashita

Abstract

The critical role of protein synthesis in regulating lifespan has been evidenced. This study shows that adult-onset RNAi inactivation of eukaryotic initiation factor 2Bdelta (eIF2Bdelta/F11A3.2), a subunit of eIF2B, extends the mean lifespan of Caenorhabditis elegans. eIF2B is a GDP-GTP exchange factor for eIF2--a rate-limiting factor for protein synthesis initiation. (35)S-methionine incorporation assay showed that global protein synthesis is reduced by eIF2Bdelta/F11A3.2 RNAi. Inhibition of eIF2Bdelta/F11A3.2 during adulthood conferred thermal and oxidative stress resistance and reduced the fecundity and fat storage, suggesting the possible trade-offs of resources between reproduction and somatic maintenance. Lifespan extension by adult-onset eIF2Bdelta/F11A3.2 RNAi is suppressed in FOXO transcription factor daf-16 deletion mutants. Adult-onset eIF2Bdelta/F11A3.2 RNAi increases the expression of stress-resistant genes, including hsp-16.2, hsp-70, hsp90, and sod-3, some of which are reported to be targets of DAF-16. Adult-onset eIF2Bdelta/F11A3.2 RNAi in daf-16 mutants reduced fecundity, but did not extend lifespan. Furthermore, adult-onset eIF2Bdelta/F11A3.2 RNAi did not extend the lifespan of germline-defective glp-4 organis...Continue Reading

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Oct 16, 2013·Trends in Biochemical Sciences·Michael Y Sherman, Shu-Bing Qian
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