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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
12:26

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

Published on: May 3, 2018

Cyclin-dependent kinases 4 and 6 control tumor progression and direct glucose oxidation in the pentose cycle

Miriam Zanuy1, Antonio Ramos-Montoya, Oscar Villacañas

  • 1Department of Biochemistry and Molecular Biology, Faculty of Biology (Edifici Nou), University of Barcelona, Av. Diagonal 645, 08028 Barcelona, Spain. Institute of Biomedicine of the Universitat de Barcelona (IBUB) and CSIC Associated Unit, Barcelona, Spain.

Metabolomics : Official Journal of the Metabolomic Society
|June 5, 2012
PubMed

Insights

Calcein AM effectively inhibits cyclin-dependent kinases CDK4 and CDK6, halting cancer cell division and altering cellular metabolism. This discovery highlights selective CDK4/6 inhibition as a promising cancer therapy strategy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Cyclin-dependent kinases CDK4 and CDK6 are crucial regulators of the G1 phase of the cell cycle.
  • Their aberrant expression is a common characteristic of many cancers, making them significant therapeutic targets.

Purpose of the Study:

  • To investigate calcein AM as a specific inhibitor of CDK4 and CDK6.
  • To determine the effects of calcein AM on cell cycle progression and cellular metabolism.
  • To confirm the role of CDK4/6 inhibition in observed metabolic alterations.

Main Methods:

  • Calcein AM was used to treat HCT116 human colon adenocarcinoma cells.
  • Inhibition of retinoblastoma protein (pRb) phosphorylation and cell cycle arrest were assessed.
  • Metabolic profiling, including pentose phosphate pathway flux, was evaluated.
  • A CDK4, CDK6, and CDK2 triple knockout mouse embryonic fibroblast model was used for comparison.

Main Results:

  • Calcein AM specifically inhibited CDK4 and CDK6 in HCT116 cells, leading to G1 phase cell cycle arrest.
  • Calcein AM significantly altered the flux between the oxidative and non-oxidative branches of the pentose phosphate pathway.
  • Metabolic changes observed with calcein AM treatment mirrored those in the CDK-deficient cells, confirming CDK4/6 inhibition's role.

Conclusions:

  • Selective inhibition of CDK4 and CDK6 by calcein AM halts cancer cell division and impacts tumor cell metabolism.
  • Targeting CDK4/6 offers a dual approach to cancer therapy by affecting both cell cycle progression and metabolic pathways.
  • Low-dose calcein AM demonstrates potential for halting cell division and inducing tumor cell death.

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