Mitochondrial reactive oxygen species trigger hypoxia-inducible factor-dependent extension of the replicative life span during hypoxia

Eric L. Bell, Tatyana A. Klimova, James Eisenbart, Paul T. Schumacker, Navdeep S. Chandel*

*Corresponding author for this work

Research output: Contribution to journalArticle

140 Scopus citations

Abstract

Physiological hypoxia extends the replicative life span of human cells in culture. Here, we report that hypoxic extension of replicative life span is associated with an increase in mitochondrial reactive oxygen species (ROS) in primary human lung fibroblasts. The generation of mitochondrial ROS is necessary for hypoxic activation of the transcription factor hypoxia-inducible factor (HIF). The hypoxic extension of replicative life span is ablated by a dominant negative HIF. HIF is sufficient to induce telomerase reverse transcriptase mRNA and telomerase activity and to extend replicative life span. Furthermore, the down-regulation of the von Hippel-Lindau tumor suppressor protein by RNA interference increases HIF activity and extends replicative life span under normoxia. These findings provide genetic evidence that hypoxia utilizes mitochondrial ROS as signaling molecules to activate HIF-dependent extension of replicative life span.

Original languageEnglish (US)
Pages (from-to)5737-5745
Number of pages9
JournalMolecular and cellular biology
Volume27
Issue number16
DOIs
StatePublished - Aug 2007

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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