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Novel PKCs activate ERK through PKD1 in MCF-7 cells

Claudia Torricelli1, Giuseppe Valacchi, Emanuela Maioli

  • 1Department of Physiology, University of Siena, via Aldo Moro 7, Siena, Italy.

In Vitro Cellular & Developmental Biology. Animal
|November 16, 2010
PubMed

Insights

Novel protein kinase Cs (nPKCs) activate Extracellular signal-regulated Kinases (ERK) in MCF-7 cells. This occurs via a novel PKC/PKD1 cascade, which is crucial for ERK activation by PMA in these cells.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Cancer research

Background:

  • Protein Kinase Cs (PKCs) exhibit dual roles in regulating ERK phosphorylation.
  • Novel (n)PKCs can inhibit ERK, while classical and atypical PKCs activate it.
  • MCF-7 cells predominantly express nPKCs, necessitating clarification of PKC-mediated ERK activation.

Purpose of the Study:

  • To elucidate the mechanism by which PMA-activated PKCs induce ERK activation in MCF-7 cells.
  • To investigate the specific role of nPKCs in this activation pathway.

Main Methods:

  • Utilized chemical inhibitors targeting PKCs.
  • Employed antibodies against PKCs delivered via the Chariot transfection system.
  • Investigated the role of PKD1 in the observed signaling cascade.

Main Results:

  • nPKCs were found to activate ERK through the transphosphorylation of PKD1.
  • Inhibiting PKD1 effectively blocked PMA-stimulated ERK activation.
  • The nPKCs/PKD1 pathway was identified as critical for ERK activation.

Conclusions:

  • The nPKCs/PKD1 signaling cascade is the primary determinant of ERK activation by PMA in MCF-7 cells.
  • This finding clarifies a specific pathway for ERK regulation in this cellular context.

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