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Updated: Jun 10, 2026

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

p53-dependent induction of prostate cancer cell senescence by the PIM1 protein kinase

Marina Zemskova1, Michael B Lilly, Ying-Wei Lin

  • 1Department of Cell and Molecular Pharmacology, Hollings Cancer Center, Charleston, SC 29425, USA.

Molecular Cancer Research : MCR
|July 22, 2010
PubMed

Insights

Overexpression of PIM1 kinase induces cellular senescence and DNA damage in prostate cancer cells, primarily through the p53 pathway. This senescence can inhibit tumor growth when the p53-p21 pathway is active.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • The PIM family of serine/threonine protein kinases regulates malignant cell growth and transformation.
  • PIM1 overexpression can inhibit cell and tumor growth in a cell-dependent manner.

Purpose of the Study:

  • To investigate the role of PIM1 overexpression in cellular senescence and its underlying mechanisms in human prostate cancer cells.
  • To determine the impact of PIM1 on DNA damage response and apoptosis pathways.

Main Methods:

  • Overexpression of PIM1 in 22Rv1, Du145, and RWPE-2 human prostate cells.
  • Assessment of senescence markers (SA-beta-Gal, p21, IL-6, IL-8).
  • Analysis of DNA damage markers (gammaH2AX, CHK2 phosphorylation) and p53 pathway activation.
  • In vivo studies using a subcutaneous tumor model.

Main Results:

  • PIM1 overexpression induced senescence, polyploidy, and DNA damage in 22Rv1 cells, but not in Du145 or RWPE-2 cells.
  • The p53 pathway, including p53 protein and downstream targets like p21, was activated by PIM1, leading to senescence and apoptosis.
  • Inactivation of the p53-p21 pathway abrogated PIM1-induced senescence in vitro and in vivo.

Conclusions:

  • PIM1-induced senescence in prostate cancer cells is dependent on the p53-p21 pathway.
  • PIM1's effect on tumorigenesis is most significant when the senescence response is compromised.

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