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PKC promotes proliferation of airway smooth muscle cells by regulating cyclinD1 expression in asthmatic rats

Li-fen Qiao1, Yong-jian Xu, Xian-sheng Liu

  • 1Department of Respiratory Medicine, Huazhong University of Science and Technology, Wuhan 430030, China.

Acta Pharmacologica Sinica
|May 27, 2008
PubMed
Abstract

Insights

Protein kinase C (PKC) promotes asthmatic airway smooth muscle cell proliferation, likely by upregulating cyclin D1. Inhibiting cyclin D1 expression blocks this PKC-induced growth, suggesting a key regulatory role in asthma.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Respiratory Medicine

Background:

  • Asthma involves airway smooth muscle (ASM) remodeling.
  • Cyclin D1 is crucial for cell cycle progression and growth control.
  • Protein kinase C (PKC) signaling pathways are implicated in cellular responses.

Purpose of the Study:

  • To investigate the role of PKC in regulating cyclin D1 expression in asthmatic ASM cells.
  • To elucidate the molecular mechanisms by which PKC influences ASM remodeling.
  • To determine if PKC-mediated ASM proliferation is dependent on cyclin D1.

Main Methods:

  • Asthmatic rat ASM cells were treated with PKC agonists (PMA) and antagonists (Ro31-8220).
  • Cell proliferation was assessed using proliferation assays.
  • Expression levels of PKCalpha and cyclin D1 were quantified using RT-PCR and Western blotting.
  • The effect of antisense cyclin D1 on cell proliferation was evaluated.

Main Results:

  • PKC activation by PMA significantly promoted ASM cell proliferation.
  • A strong positive correlation was observed between PKCalpha and cyclin D1 expression at both transcriptional and translational levels.
  • Inhibition of cyclin D1 expression using pcDNA3.1-ascyclinD1 suppressed ASM cell proliferation.
  • The combination of Ro31-8220 and pcDNA3.1-ascyclinD1 effectively blocked PMA-induced proliferation.

Conclusions:

  • PKC-induced proliferation of ASM cells in asthmatic rats is significantly regulated by cyclin D1 expression.
  • Targeting the PKC-cyclin D1 pathway may offer a therapeutic strategy for managing airway remodeling in asthma.

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