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Inhibition of P21-activated Kinase 1 Promotes Vascular Smooth Muscle Cells Apoptosis Through Reduction of

Lin Jiao1,2, Wenjuan Yi3, Yu-Rong Chang1,2

  • 1Department of Cardiology, Zhongnan Hospital, Wuhan University, Wuhan 430071, China.

American Journal of Hypertension
|January 12, 2023
PubMed
Abstract

Insights

P21-activated kinase 1 (Pak1) regulates vascular smooth muscle cell (VSMC) apoptosis. Pak1 inhibition increases VSMC apoptosis and decreases proliferation, suggesting Pak1 is a therapeutic target for cardiovascular diseases.

Area of Science:

  • Cardiovascular Biology
  • Cellular Biology
  • Molecular Medicine

Background:

  • P21-activated kinase 1 (Pak1) influences cell apoptosis and cardiovascular diseases.
  • Vascular smooth muscle cell (VSMC) apoptosis is critical in cardiovascular pathologies.
  • Pak1 is a potential therapeutic target for regulating VSMC behaviors.

Purpose of the Study:

  • To investigate the role of Pak1 in VSMC apoptosis.
  • To explore Pak1 as a novel regulator of VSMC behaviors.

Main Methods:

  • Pak1 expression analysis in VSMCs after H2O2 administration.
  • Pak1 knockdown using loss-of-function approaches.
  • Assessment of VSMC apoptosis via TUNEL staining.
  • Evaluation of VSMC proliferation using EdU staining.
  • Analysis of pro- and anti-apoptotic gene expression.
  • Measurement of Bad phosphorylation levels.
  • Examination of Pak1 expression in carotid arteries.

Main Results:

  • Pak1 expression was upregulated in VSMCs upon H2O2 stimulation.
  • Pak1 knockdown increased VSMC apoptosis and inhibited proliferation.
  • Pak1 silencing altered the expression of apoptosis-related genes.
  • Pak1 knockdown reduced Bad phosphorylation.
  • Pak1 expression was elevated in injured carotid arteries.

Conclusions:

  • Pak1 acts as a novel regulator of VSMC apoptosis.
  • Pak1's role in apoptosis is partly mediated through Bad phosphorylation.
Keywords:
Pak1apoptosisbadblood pressurehypertensionproliferationvascular smooth muscle cells

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