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CDK6 as a key regulator of hematopoietic and leukemic stem cell activation

Ruth Scheicher1, Andrea Hoelbl-Kovacic1, Florian Bellutti1

  • 1Institute of Pharmacology and Toxicology, University of Veterinary Medicine, Vienna, Austria;

Blood
|October 25, 2014
PubMed

Insights

Cyclin-dependent kinase 6 (CDK6) is crucial for activating hematopoietic stem cells (HSCs) and leukemic stem cells (LSCs). This study reveals CDK6

Area of Science:

  • Hematology
  • Stem Cell Biology
  • Molecular Biology

Background:

  • Cyclin-dependent kinase 4 (CDK4) and cyclin-dependent kinase 6 (CDK6) share redundant roles in cell-cycle regulation.
  • The specific functions of CDK6 in hematopoietic stem cells (HSCs) and leukemic stem cells (LSCs) beyond cell-cycle control are not fully understood.

Purpose of the Study:

  • To investigate the novel roles of CDK6 in HSC and LSC function.
  • To elucidate the molecular mechanisms underlying CDK6's function in stem cell activation.

Main Methods:

  • Utilized competitive transplantation assays in Cdk6(-/-) mice.
  • Administered 5-fluorouracil to assess drug sensitivity.
  • Performed transcriptional profiling of HSCs and LSCs.
  • Conducted gene knockdown experiments (Egr1) in LSCs.

Main Results:

  • Cdk6(-/-) HSCs exhibit impaired repopulation capacity and increased susceptibility to chemotherapy.
  • CDK6 is essential for HSC activation, regulating the transcription of key factors like Egr1.
  • The absence of CDK6 in BCR-ABL(p210+) LSCs hinders disease induction, with Egr1 suppression being critical.

Conclusions:

  • CDK6 plays a vital role in the activation of HSCs and LSCs, extending beyond cell-cycle regulation.
  • CDK6 functions as a component of a transcriptional complex that suppresses Egr1 expression in stem cells.
  • The CDK6-Egr1 axis is a critical regulator of stem cell function and potential therapeutic target.

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