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Overexpression of HDAC1 induces cellular senescence by Sp1/PP2A/pRb pathway

Jian-Ying Chuang1, Jan-Jong Hung

  • 1Department of Pharmacology, National Cheng-Kung University, Tainan 701, Taiwan.

Biochemical and Biophysical Research Communications
|March 23, 2011
PubMed

Insights

Overexpressing histone deacetylase 1 (HDAC1) in cervical cancer cells triggers premature senescence. This occurs via a new pathway involving Sp1, PP2A, and pRb, inhibiting tumor cell growth and division.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Cellular senescence, characterized by reduced DNA replication, protein synthesis, and division, contributes to functional decline.
  • Histone deacetylase 1 (HDAC1) plays a role in regulating gene expression and cellular processes.

Purpose of the Study:

  • To investigate the effect of HDAC1 overexpression on tumor cell proliferation and senescence.
  • To elucidate the molecular pathway through which HDAC1 influences cervical cancer cell behavior.

Main Methods:

  • Utilized Tet-off induced system and transient transfection to overexpress HDAC1 in cervical cancer cells.
  • Assessed cell proliferation, senescence markers, and protein levels of key regulatory molecules (pRb, PP2Ac, Sp1).
  • Analyzed protein-protein interactions and gene promoter binding using techniques like co-immunoprecipitation and chromatin immunoprecipitation.

Main Results:

  • HDAC1 overexpression significantly repressed tumor cell growth and division.
  • HDAC1 induced senescence by accumulating hypophosphorylated retinoblastoma protein (pRb) and increasing protein phosphatase 2A catalytic subunit (PP2Ac) levels.
  • HDAC1 mediated Sp1 deacetylation, enhancing Sp1/p300 complex binding to the PP2Ac promoter, thereby upregulating PP2Ac expression.

Conclusions:

  • HDAC1 overexpression restrains cell proliferation and induces premature senescence in cervical cancer cells.
  • A novel pathway involving Sp1/PP2A/pRb mediates the senescence-inducing effects of HDAC1.
  • HDAC1 represents a potential therapeutic target for cervical cancer treatment.

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