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Induction and Validation of Cellular Senescence in Primary Human Cells
08:18

Induction and Validation of Cellular Senescence in Primary Human Cells

Published on: June 20, 2018

YY1 restrained cell senescence through repressing the transcription of p16

Xiuli Wang1, Yunpeng Feng, Liang Xu

  • 1Institute of Genetics and Cytology, Northeast Normal University, Changchun 130024, P.R. China.

Biochimica Et Biophysica Acta
|June 19, 2008
PubMed

Insights

The transcription factor YY1 suppresses cell senescence by inhibiting p16(INK4a) expression. This involves epigenetic regulation by HDAC3 and HDAC4, revealing a new mechanism controlling cell aging.

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Cell Biology

Background:

  • The transcription factor Yin Yang 1 (YY1) is involved in cell growth control.
  • Cellular senescence is a key process in aging and tumor suppression.
  • p16(INK4a) is a critical inhibitor of cyclin-dependent kinases, regulating cell cycle progression and senescence.

Purpose of the Study:

  • To investigate the role of YY1 in regulating NCI-H460 cell senescence.
  • To elucidate the mechanism by which YY1 affects p16(INK4a) expression.
  • To determine the involvement of epigenetic modifications and histone deacetylases (HDACs) in YY1-mediated senescence suppression.

Main Methods:

  • Cell culture (NCI-H460, 293T cells).
  • Gene expression analysis (p16(INK4a) regulation).
  • Chromatin immunoprecipitation (ChIP) assays to assess protein-DNA interactions.
  • Co-immunoprecipitation (Co-IP) assays to detect protein complexes.
  • Knockdown experiments to evaluate functional consequences.
  • SA-beta-gal staining to quantify senescence.

Main Results:

  • YY1 suppresses NCI-H460 cell senescence by downregulating p16(INK4a) expression.
  • YY1, HDAC3, and HDAC4 form a complex that represses p16(INK4a) promoter activity via histone acetylation modification.
  • Knockdown of YY1, HDAC3, or HDAC4 leads to cell enlargement, altered morphology, and increased SA-beta-gal activity, indicating induced senescence.

Conclusions:

  • YY1, in complex with HDAC3 and HDAC4, restrains cell senescence.
  • This repression of senescence is achieved by inhibiting p16(INK4a) expression through epigenetic modification of histones.
  • The findings uncover a novel epigenetic pathway regulating cellular senescence involving YY1 and specific HDACs.

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