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UCN enhances TGF-beta-mediated mitoinhibition of VSMCs via counteracting TGF-beta-induced cPLA2 expression and

Chao Zhu1, Changchun Cao1, Xiaofei Wang1

  • 1Jiangsu Provincial Key Lab of Cardiovascular Diseases and Molecular Intervention, Department of Pharmacology, Nanjing Medical University, Nanjing 210029, PR China.

The International Journal of Biochemistry & Cell Biology
|October 6, 2016
PubMed

Insights

Urocortins and TGF-beta inhibit vascular smooth muscle cell proliferation. Urocortins counteract TGF-beta

Area of Science:

  • Cardiovascular Biology
  • Cell Signaling
  • Molecular Medicine

Background:

  • Vascular smooth muscle cell (VSMC) proliferation contributes to cardiovascular diseases.
  • Cytosolic phospholipase A2 (cPLA2)-mediated arachidonic acid release drives VSMC proliferation.
  • Urocortins (UCNs) and transforming growth factor-beta (TGF-beta) are implicated in cardiovascular pathologies.

Purpose of the Study:

  • To investigate the regulation of VSMC proliferation by UCN and TGF-beta.
  • To determine if cPLA2 acts as a link between UCN and TGF-beta signaling pathways in VSMCs.

Main Methods:

  • VSMC proliferation assessed via colorimetric assay and immunofluorescence microscopy.
  • Cell cycle analysis performed using flow cytometry.
  • cPLA2 gene overexpression achieved using lentiviral vectors; cPLA2 activity inhibited using pyrrophenone (PYR).

Main Results:

  • Both UCN and TGF-beta inhibited VSMC proliferation, with an additive effect when combined.
  • TGF-beta promoted G1-phase arrest, while UCN induced G2-phase arrest.
  • TGF-beta upregulated cPLA2 expression and phosphorylation, whereas UCN downregulated cPLA2 and attenuated TGF-beta's effects.
  • Overexpression of cPLA2 abolished UCN's inhibitory effect on proliferation.

Conclusions:

  • UCN and TGF-beta exhibit opposing roles in regulating VSMC proliferation via modulation of cPLA2 signaling.
  • UCN counteracts TGF-beta-induced VSMC proliferation by inhibiting cPLA2 activation and expression.
  • Targeting the UCN-cPLA2-TGF-beta axis may offer therapeutic strategies for cardiovascular diseases involving VSMC proliferation.
Keywords:
MitoinhibitionTGF-betaUCNVSMCscPLA2

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