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Induction and Validation of Cellular Senescence in Primary Human Cells
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Knockdown of CDK2AP1 in primary human fibroblasts induces p53 dependent senescence

Khaled N Alsayegh1, Venkat S Gadepalli2, Shilpa Iyer3

  • 1Department of Human and Molecular Genetics, Virginia Commonwealth University, Richmond, United States of America; King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, Jeddah, Saudi Arabia.

Plos One
|March 19, 2015
PubMed

Insights

Downregulating Cyclin Dependent Kinase-2 Associated Protein-1 (CDK2AP1) in fibroblasts reduced cell proliferation and induced senescence. This effect was dependent on the tumor suppressor protein p53.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Oncology

Background:

  • Cyclin Dependent Kinase-2 Associated Protein-1 (CDK2AP1) functions as a tumor suppressor involved in cell cycle regulation.
  • Reduced CDK2AP1 expression is linked to poor prognosis in oral squamous cell carcinoma and increased invasion in gastric cancer.
  • CDK2AP1 overexpression inhibits growth and invasion while promoting apoptosis in prostate cancer cells.

Purpose of the Study:

  • To investigate the functional consequences of CDK2AP1 downregulation in primary human dermal fibroblasts.
  • To elucidate the role of CDK2AP1 in cell cycle progression, senescence, and DNA damage response.
  • To determine the involvement of p53 and ARF pathways in the CDK2AP1 knockdown phenotype.

Main Methods:

  • Short-hairpin RNA (shRNA) was used to achieve CDK2AP1 knockdown in primary human fibroblasts.
  • Cell proliferation, senescence (beta-galactosidase activity), cell cycle distribution (G1/S phases), and DNA damage (γ-H2AX foci) were assessed.
  • mRNA and protein levels of key cell cycle regulators (p53, p21, BAX, PUMA, ARF) were analyzed.

Main Results:

  • CDK2AP1 knockdown led to reduced proliferation, induced senescence, and increased γ-H2AX foci, indicating DNA damage.
  • Cells exhibited G1 cell cycle arrest and increased expression of p53, p21, BAX, and PUMA.
  • Simultaneous downregulation of p53 and CDK2AP1 abrogated senescence and reversed cell cycle changes, confirming p53 dependency.
  • ARF protein levels increased, suggesting a role in p53 stabilization.

Conclusions:

  • CDK2AP1 downregulation in fibroblasts impairs proliferation and triggers premature senescence.
  • The observed phenotype is mediated through a p53-dependent pathway.
  • ARF may play a role in stabilizing p53 following CDK2AP1 knockdown.

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