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The Cdk inhibitor p57(Kip2) controls LIM-kinase 1 activity and regulates actin cytoskeleton dynamics

P Vlachos1, B Joseph

  • 1Department of Oncology-Pathology, Cancer Centrum Karolinska, Karolinska Institute, Stockholm, Sweden.

Oncogene
|September 8, 2009
PubMed

Insights

The tumor suppressor p57(Kip2) interacts with LIM-kinase 1 (LIMK-1), enhancing its activity and impacting actin dynamics. This regulation of actin cytoskeleton affects cancer cell migration.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • The cyclin-dependent kinase inhibitor p57(Kip2) is a known tumor suppressor gene.
  • Its inactivation is linked to cancer progression and poor patient outcomes.
  • The role of p57(Kip2) in regulating cell migration is not fully understood.

Purpose of the Study:

  • To investigate the interaction between p57(Kip2) and the actin cytoskeleton.
  • To determine the effect of p57(Kip2) on LIM-kinase 1 (LIMK-1) activity and actin dynamics.
  • To elucidate the impact of p57(Kip2) on cancer cell mobility.

Main Methods:

  • Co-immunoprecipitation to assess protein interactions.
  • In vitro kinase assays to measure LIMK-1 activity.
  • Fluorescence microscopy and FRAP to analyze actin cytoskeleton dynamics.
  • Cell migration assays.

Main Results:

  • p57(Kip2) directly interacts with LIMK-1, enhancing its kinase activity.
  • This interaction leads to increased cofilin phosphorylation and actin stress fiber formation.
  • p57(Kip2) expression reduces actin turnover and inhibits cancer cell migration.

Conclusions:

  • p57(Kip2) regulates actin cytoskeleton dynamics through its interaction with LIMK-1.
  • This novel function of p57(Kip2) impacts cancer cell migration.
  • p57(Kip2) plays a critical role in controlling cancer cell motility beyond its known functions in proliferation and cell death.

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