The relationship between the aging- and photo-dependent T414G mitochondrial DNA mutation with cellular senescence and reactive oxygen species production in cultured skin fibroblasts

Matthew J. Birket, Joo F. Passos, Thomas Von Zglinicki, Mark A. Birch-Machin

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Mutations in the mitochondrial genome (mtDNA) are thought to be one of the causes of age-dependent cellular decline through their detrimental effects on respiration or reactive oxygen species (ROS) production. However, for many mutations, this link has not been clearly established. This study aimed to further investigate the phenotypic importance of a T414G mutation within the control region of mtDNA, previously shown to accumulate in both chronologically and photoaged human skin. We demonstrate that during dermal skin fibroblast replication in vitro in five separate cultures obtained from elderly individuals, the T414G mutant load can either increase or decrease during progressive cell division, implying the absence of consistent selection against the mutation in this context. In support of this, by utilizing a cell-sorting approach, we demonstrate that the level of the T414G mutation does not directly correlate with increased or decreased mtDNA copy number, or markers of cellular ageing including lipofuscin accumulation or ROS production. By consequence, the mutation can be distributed with a bias towards either the proliferating or senescent cell populations depending on the cell line. In conclusion, we propose that this particular mutation may have little effect on ROS production and the onset of cellular senescence in cultured fibroblasts.

Original languageEnglish (US)
Pages (from-to)1361-1366
Number of pages6
JournalJournal of Investigative Dermatology
Volume129
Issue number6
DOIs
StatePublished - Jun 1 2009

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Dermatology
  • Cell Biology

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