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CDK1 inhibition targets the p53-NOXA-MCL1 axis, selectively kills embryonic stem cells, and prevents teratoma

Noelle E Huskey1, Tingxia Guo2, Kimberley J Evason3

  • 1Department of Cell and Tissue Biology and Medicine, University of California, San Francisco, San Francisco, CA 94143, USA.

Stem Cell Reports
|March 4, 2015
PubMed

Insights

Embryonic stem cells (ESCs) are uniquely sensitive to cyclin-dependent kinase 1 (CDK1) inhibition. Targeting CDK1 activates a DNA damage response, leading to the death of ESCs and preventing tumor formation.

Area of Science:

  • Stem cell biology
  • Cancer research
  • Molecular oncology

Background:

  • Embryonic stem cells (ESCs) exhibit a unique, accelerated cell cycle with early expression of cyclins and cyclin-dependent kinases (CDKs).
  • Understanding the regulation of ESC proliferation and survival is crucial for stem cell applications and cancer therapy.

Purpose of the Study:

  • To investigate the impact of CDK inhibition on the proliferation and survival pathways in ESCs.
  • To identify specific molecular mechanisms underlying ESC sensitivity to CDK inhibition.

Main Methods:

  • Inhibition of cyclin-dependent kinase 1 (CDK1) in human and mouse ESCs and differentiated cells.
  • Analysis of DNA damage response, p53 stabilization, p53 target gene activation (NOXA), and MCL1 regulation.
  • Assessment of MCL1 expression and its role in ESC survival.
  • Evaluation of CDK1 inhibitors in preventing and treating ESC-derived tumors in vivo.

Main Results:

  • CDK1 inhibition in ESCs activates the DNA damage response, stabilizes p53, upregulates NOXA, and downregulates the anti-apoptotic protein MCL1.
  • ESCs show high MCL1 expression, and its depletion results in cell death.
  • Differentiated cells do not exhibit the same sensitivity to CDK1 inhibition.
  • Clinically relevant CDK1 inhibitors prevent ESC-derived tumor formation and induce necrosis in existing tumors.

Conclusions:

  • ESCs possess a unique vulnerability to CDK1 inhibition mediated by the p53/NOXA/MCL1 pathway.
  • CDK1 inhibition represents a potential therapeutic strategy against ESC-derived tumors due to the specific sensitivity of ESCs.

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