C. elegans longevity pathways converge to decrease mitochondrial membrane potential

Mech Ageing Dev. 2009 Jul;130(7):461-5. doi: 10.1016/j.mad.2009.05.001. Epub 2009 May 12.

Abstract

Energy production via oxidative phosphorylation generates a mitochondrial membrane potential (DeltaPsi(m)) across the inner membrane. In this work, we show that a lower DeltaPsi(m) is associated with increased lifespan in Caenorhabditis elegans. The long-lived mutants daf-2(e1370), age-1(hx546), clk-1(qm30), isp-1(qm150) and eat-2(ad465) all have a lower DeltaPsi(m) than wild type animals. The lower DeltaPsi(m) of daf-2(e1370) is daf-16 dependent, indicating that the insulin-like signaling pathway not only regulates lifespan but also mitochondrial energetics. RNA interference (RNAi) against 17 genes shown to extend lifespan also decrease DeltaPsi(m). Furthermore, lifespan can be significantly extended with the uncoupler carbonylcyanide-3-chlorophenylhydrazone (CCCP), which dissipates DeltaPsi(m). We conclude that longevity pathways converge on the mitochondria and lead to a decreased DeltaPsi(m). Our results are consistent with the 'uncoupling to survive' hypothesis, which states that dissipation of the DeltaPsi(m) will extend lifespan.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Caenorhabditis elegans / genetics
  • Caenorhabditis elegans / metabolism*
  • Caenorhabditis elegans Proteins / genetics
  • Caenorhabditis elegans Proteins / metabolism*
  • Carbonyl Cyanide m-Chlorophenyl Hydrazone / pharmacology
  • Longevity / drug effects
  • Longevity / physiology*
  • Membrane Potential, Mitochondrial / drug effects
  • Membrane Potential, Mitochondrial / physiology*
  • Mitochondria / genetics
  • Mitochondria / metabolism*
  • Mitochondrial Proteins / genetics
  • Mitochondrial Proteins / metabolism*
  • Uncoupling Agents / pharmacology

Substances

  • Caenorhabditis elegans Proteins
  • Mitochondrial Proteins
  • Uncoupling Agents
  • Carbonyl Cyanide m-Chlorophenyl Hydrazone

Associated data

  • RefSeq/NM_001026422
  • RefSeq/NM_063093
  • RefSeq/NM_063187
  • RefSeq/NM_063975
  • RefSeq/NM_063987
  • RefSeq/NM_064061
  • RefSeq/NM_064195
  • RefSeq/NM_064439
  • RefSeq/NM_064558
  • RefSeq/NM_065249
  • RefSeq/NM_065727
  • RefSeq/NM_066494
  • RefSeq/NM_066751
  • RefSeq/NM_066882
  • RefSeq/NM_067490
  • RefSeq/NM_068960
  • RefSeq/NM_069186
  • RefSeq/NM_069264
  • RefSeq/NM_069511
  • RefSeq/NM_070066
  • RefSeq/NM_070994
  • RefSeq/NM_073354
  • RefSeq/NM_074197
  • RefSeq/NM_075693
  • RefSeq/NM_076364
  • RefSeq/NM_076509
  • RefSeq/NM_078168
  • RefSeq/NM_171785