Loco signaling pathway in longevity

Yuh Ru Lin, Hardik Parikh, Yongkyu Park

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Despite the various roles of regulator of G protein signaling (RGS) protein in the G protein signaling pathway that have been defined, the function of RGS has not been characterized in longevity signaling pathways. We found that reduced expression of Loco, a Drosophila RGS protein, resulted in a longer lifespan of flies with stronger resistance to stress, higher MnSOD activity and increased fat content. In contrast, overexpression of the loco gene shortened the fly lifespan significantly, lowered stress resistance and reduced fat content, also indicating that the RGS domain containing GTPase-activating protein (GAP) activity is related to the regulation of longevity. Interestingly, expressional changes of yeast RGS2 and rat RGS14, homologs to the fly Loco, also affected oxidative stress resistance and longevity in the respective species. It is known that Loco inactivates inhibitory Gαi•GTP protein to reduce activity of adenylate cyclase (AC) and RGS14 interacts with activated H-Ras and Raf-1 kinases, which subsequently inhibits ERK phosphorylation. We propose that Loco/RGS14 protein may regulate stress resistance and longevity as an activator in AC-cAMP-PKA pathway and/or as a molecular scaffold that sequesters active Ras and Raf from Ras•GTP-Raf-MEKERK signaling pathway. Consistently, our data showed that downregulation of Loco significantly diminishes cAMP amounts and increases p-ERK levels with higher resistance to the oxidative stress.

Original languageEnglish (US)
Pages (from-to)158-161
Number of pages4
JournalSmall GTPases
Volume2
Issue number3
DOIs
StatePublished - 2011

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Cell Biology

Keywords

  • AC-PKA pathway
  • Erk-phosphorylation
  • G-protein signaling
  • Loco
  • Longevity
  • Nutritional content
  • RGS protein
  • Ras/Raf/MEK/ERK signaling pathway
  • Stress resistance

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