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APC and Smad7 link TGFβ type I receptors to the microtubule system to promote cell migration

Maria Ekman1, Yabing Mu, So Young Lee

  • 1Ludwig Institute for Cancer Research, Uppsala University, Uppsala, Sweden.

Molecular Biology of the Cell
|April 13, 2012
PubMed

Insights

Smad7 and p38 kinase regulate adenomatous polyposis coli (APC) expression and prostate cancer cell migration. The Smad7-APC complex facilitates TGFβ-induced cell extension by linking receptors to microtubules.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Cell migration is a complex process regulated by integrated pathways responding to extracellular cues.
  • Adenomatous polyposis coli (APC) binding to microtubule plus ends, regulated by GSK-3β, is vital for cell polarity during migration.
  • The role of APC in cellular extension upon extracellular signaling requires further elucidation.

Purpose of the Study:

  • To investigate the novel function of Smad7 in prostate cancer cell migration.
  • To elucidate the regulatory mechanisms of APC expression and cell migration in response to TGFβ stimulation.

Main Methods:

  • Investigated the interplay between Smad7, p38 MAPK, APC, and GSK-3β in prostate cancer cells.
  • Utilized techniques to analyze protein complex formation and kinase activity.
  • Examined the impact of TGFβ stimulation on cell migration and APC localization.

Main Results:

  • Smad7 and p38 MAPK cooperatively regulate APC expression and cell migration in prostate cancer cells stimulated by TGFβ.
  • Smad7 forms a complex with APC, acting as an adaptor for p38 and GSK-3β kinases.
  • This complex facilitates TGFβ/p38-dependent GSK-3β inactivation, β-catenin accumulation, and APC recruitment to microtubule plus ends at the leading edge.
  • The Smad7-APC complex connects the TGFβ type I receptor to the microtubule system, regulating directed cell extension and migration.

Conclusions:

  • Smad7 plays a critical role in regulating prostate cancer cell migration through a novel mechanism involving APC.
  • The Smad7-APC complex acts as a key mediator in TGFβ-induced cell migration, influencing polarity and directed extension.
  • This finding provides new insights into the molecular pathways governing cancer cell motility and potential therapeutic targets.

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