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Lipid Supplementation for Longevity and Gene Transcriptional Analysis in Caenorhabditis elegans
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Published on: December 9, 2022

Loco signaling pathway in longevity.

Yuh-Ru Lin1, Hardik Parikh, Yongkyu Park

  • 1Department of Cell Biology and Molecular Medicine; University of Medicine and Dentistry of New Jersey-New Jersey Medical School; Newark, NJ USA.

Small Gtpases
|July 22, 2011
PubMed
Summary
This summary is machine-generated.

Reduced expression of the RGS protein Loco extends lifespan and stress resistance in flies. This suggests Regulator of G protein signaling (RGS) proteins play a role in longevity and oxidative stress pathways.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Aging Research

Background:

  • Regulator of G protein signaling (RGS) proteins are known regulators of G protein signaling pathways.
  • The specific role of RGS proteins in longevity signaling pathways remains largely uncharacterized.

Purpose of the Study:

  • To investigate the function of RGS proteins, specifically the Drosophila RGS protein Loco, in longevity and stress resistance.
  • To explore the conserved role of RGS homologs in other species regarding longevity and oxidative stress.

Main Methods:

  • Utilized Drosophila melanogaster as a model organism to study gene expression and lifespan.
  • Examined the effects of reduced and overexpressed Loco gene on fly lifespan, stress resistance, MnSOD activity, and fat content.
  • Investigated homologous RGS proteins in yeast (RGS2) and rat (RGS14) to assess conserved functions.

Main Results:

  • Reduced expression of Loco in Drosophila resulted in a significantly longer lifespan, increased stress resistance, higher MnSOD activity, and increased fat content.
  • Overexpression of Loco shortened lifespan, decreased stress resistance, and reduced fat content, indicating a dose-dependent effect.
  • Changes in yeast RGS2 and rat RGS14 expression also impacted oxidative stress resistance and longevity in their respective species.
  • Downregulation of Loco led to diminished cAMP levels and increased p-ERK levels, correlating with enhanced oxidative stress resistance.

Conclusions:

  • The GTPase-activating protein (GAP) activity of RGS proteins is implicated in the regulation of longevity.
  • Loco/RGS14 may regulate stress resistance and longevity by activating the AC-cAMP-PKA pathway and/or acting as a molecular scaffold to sequester active Ras and Raf, thereby inhibiting the Ras•GTP-Raf-MEK-ERK signaling pathway.