AMPK-mediated formation of stress granules is required for dietary restriction-induced longevity in Caenorhabditis elegans

Chen Ting Kuo, Guan Ting You, Ying Jie Jian, Ting Shin Chen, Yu Chen Siao, Ao Lin Hsu, Tsui Ting Ching*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Stress granules (SGs) are nonmembranous organelles that are dynamically assembled and disassembled in response to various stressors. Under stressed conditions, polyadenylated mRNAs and translation factors are sequestrated in SGs to promote global repression of protein synthesis. It has been previously demonstrated that SG formation enhances cell survival and stress resistance. However, the physiological role of SGs in organismal aging and longevity regulation remains unclear. In this study, we used TIAR-1::GFP and GTBP-1::GFP as markers to monitor the formation of SGs in Caenorhabditis elegans. We found that, in addition to acute heat stress, SG formation could also be triggered by dietary changes, such as starvation and dietary restriction (DR). We found that HSF-1 is required for the SG formation in response to acute heat shock and starvation but not DR, whereas the AMPK-eEF2K signaling is required for starvation and DR-induced SG formation but not heat shock. Moreover, our data suggest that this AMPK-eEF2K pathway-mediated SG formation is required for lifespan extension by DR, but dispensable for the longevity by reduced insulin/IGF-1 signaling. Collectively, our findings unveil a novel role of SG formation in DR-induced longevity.

Original languageEnglish
Article numbere13157
JournalAging Cell
Volume19
Issue number6
DOIs
StatePublished - 1 Jun 2020

Keywords

  • AMPK
  • dietary restriction
  • heat shock
  • HSF-1
  • longevity
  • stress granule

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