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Down-regulation of a forkhead transcription factor, FOXO3a, accelerates cellular senescence in human dermal

Hyun Kyoung Kim1, Yu Kyoung Kim, In-Hwan Song

  • 1Department of Biochemistry and Molecular Biology, College of Medicine, Yeungnam University, 317-1 Daemyung-Dong, Daegu 705-717, Republic of Korea.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
|March 3, 2005
PubMed

Insights

FOXO3a transcription factor is crucial for regulating cellular senescence in human dermal fibroblasts. Its down-regulation triggers aging phenotypes, indicating a conserved senescence mechanism.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Aging Research

Background:

  • The insulin/insulin-like growth factor/phosphatidylinositol-3 kinase/Akt/forkhead transcription factors pathway regulates lifespan and senescence across species.
  • FOXO transcription factors (FOXO1, FOXO3a, FOXO4) are key components of this vital signaling pathway.

Purpose of the Study:

  • To investigate the role of FOXO3a in regulating cellular senescence in primary cultured human dermal fibroblasts (HDFs).
  • To determine the impact of FOXO3a activation on HDF lifespan and senescence phenotypes.

Main Methods:

  • Generation of FOXO3a-siRNA stable HDFs to down-regulate FOXO3a expression.
  • Analysis of senescent phenotypes, including cell morphology, population doubling times, beta-galactosidase staining, reactive oxygen species levels, and p53/p21 protein expression.

Main Results:

  • Down-regulation of FOXO3a RNA and protein in HDFs induced significant senescent phenotypes.
  • Observed changes included altered cell morphology, increased doubling times, positive beta-galactosidase staining, elevated cellular reactive oxygen species, and increased p53/p21 protein levels.

Conclusions:

  • FOXO3a transcription factor plays a critical role in mediating cellular senescence in HDFs.
  • The findings suggest that the mechanism of cellular senescence involving FOXO3a is conserved in human dermal fibroblasts.

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