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Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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Related Experiment Video

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An Immunofluorescent Method for Characterization of Barrett&#8217;s Esophagus Cells
08:54

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Published on: July 20, 2014

RACK1 inhibits colonic cell growth by regulating Src activity at cell cycle checkpoints.

V Mamidipudi1, N K Dhillon, T Parman

  • 1Department of Medicine, Stanford University School of Medicine, Stanford University, Stanford, CA 94305, USA.

Oncogene
|October 31, 2006
PubMed
Summary

RACK1 protein suppresses colon cancer cell growth by inhibiting Src kinase activity at key cell cycle checkpoints. This discovery offers a potential new therapeutic strategy for colon cancer treatment.

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Through the Looking Glass: Time-lapse Microscopy and Longitudinal Tracking of Single Cells to Study Anti-cancer Therapeutics
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Published on: May 14, 2016

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Medicine

Background:

  • Src tyrosine kinases are activated in early human colon cancer and decrease during intestinal cell differentiation.
  • RACK1 acts as a binding partner, substrate, and inhibitor of Src kinase.

Purpose of the Study:

  • To investigate the role of RACK1 in regulating colon cell growth by modulating Src activity.
  • To elucidate the mechanisms by which RACK1 influences cell cycle progression at G1 and mitotic checkpoints.

Main Methods:

  • Overexpression and depletion of RACK1 and Src.
  • Use of cell-permeable peptides to disrupt RACK1-Src interaction.
  • Analysis of cell cycle progression, HT-29 cell growth, and molecular targets (Sam68 phosphorylation, CDK1-cyclin B complex).

Main Results:

  • RACK1 suppresses colon cell growth by inhibiting Src activity at G1 and mitotic checkpoints, delaying cell cycle progression.
  • Activated Src can overcome RACK1-mediated growth inhibition in HT-29 cells.
  • Src inhibition counteracts growth promotion from RACK1 depletion in normal cells.
  • RACK1 regulates mitotic exit by suppressing Src-mediated Sam68 phosphorylation and maintaining active CDK1-cyclin B complex.

Conclusions:

  • RACK1 plays a critical role in controlling colon cell cycle progression at G1 and during mitosis.
  • RACK1's suppression of oncogenic Src kinase at cell cycle checkpoints provides a novel mechanism for slowing colon cancer growth.
  • RACK1-mimicking small molecules represent a promising therapeutic avenue for colon cancer treatment.