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PKCdelta and MAPK mediate G(1) arrest induced by PMA in SKBR-3 breast cancer cells

Goro Yokoyama1, Teruhiko Fujii, Kosuke Tayama

  • 1Department of Surgery, Kurume University School of Medicine, 67 Asahimachi, Fukuoka 830-0011, Japan.

Biochemical and Biophysical Research Communications
|January 15, 2005
PubMed

Insights

Activating protein kinase C (PKC) with PMA inhibits breast cancer cell growth and causes G(1) cell cycle arrest. This effect is mediated primarily by PKCdelta, suggesting PKC as a therapeutic target.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Protein Kinase C (PKC) plays a role in cell signaling pathways.
  • Dysregulation of cell proliferation is a hallmark of cancer.
  • Targeting cell cycle regulators is a strategy for cancer therapy.

Purpose of the Study:

  • To investigate the effects of activating endogenous protein kinase C (PKC) on breast cancer cell proliferation and cell cycle.
  • To elucidate the specific PKC isoforms involved in these processes.
  • To evaluate PKC as a potential therapeutic target for breast cancer.

Main Methods:

  • Treatment of SKBR-3 breast cancer cells with phorbol 12-myristate 13 acetate (PMA).
  • Use of specific PKC inhibitors (GF109203X, rottlerin) and adenovirus vectors (WTPKCdeltaAdV, dominant-negative PKCdeltaAdV).
  • Analysis of cell cycle progression (G(1) arrest) and downstream signaling pathways (ERK, JNK, Rb phosphorylation).

Main Results:

  • PMA inhibited SKBR-3 cell growth in a concentration-dependent manner, inducing G(1) arrest.
  • PKCdelta was identified as the primary mediator of PMA's antiproliferative effects.
  • PMA modulated downstream signaling, inhibiting ERK and Rb phosphorylation while up-regulating JNK phosphorylation.

Conclusions:

  • PKC activation, particularly via PKCdelta, induces G(1) cell cycle arrest in breast cancer cells.
  • PKC signaling pathways are crucial in regulating cell proliferation in breast cancer.
  • PKC represents a promising therapeutic target for breast cancer treatment.

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