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Exendin-4 promotes the vascular smooth muscle cell re-differentiation through AMPK/SIRT1/FOXO3a signaling pathways

Zihan Liu1, Mengqian Zhang1, Tengfei Zhou1

  • 1Institute of Cardiovascular Science, Beijing, 100191, China; Key Laboratory of Molecular Cardiovascular Science of Ministry of Education, Peking University Health Science Center, Beijing, 100191, China.

Atherosclerosis
|July 24, 2018
PubMed
Abstract

Insights

Exendin-4, a GLP-1 receptor agonist, promotes vascular smooth muscle cell (VSMC) redifferentiation. This occurs via the AMPK/SIRT1/FOXO3a pathway, impacting VSMC phenotype switching in vascular remodeling.

Area of Science:

  • Cardiovascular Biology
  • Cellular Biology
  • Pharmacology

Background:

  • Vascular smooth muscle cell (VSMC) phenotype switching is crucial in vascular remodeling diseases.
  • Glucagon-like peptide-1 (GLP-1) has shown potential in inhibiting atherosclerotic plaque progression.

Purpose of the Study:

  • To investigate the role of Exendin-4, a GLP-1 receptor agonist, in VSMC phenotype switching.
  • To elucidate the underlying molecular mechanisms of Exendin-4's action on VSMCs.

Main Methods:

  • Immunohistochemistry and Western blot to assess VSMC contractile marker expression.
  • Phalloidin staining to evaluate VSMC morphology.
  • Inhibition/knockdown of key signaling molecules (AMPK, SIRT1, FOXO3a) to determine pathway involvement.

Main Results:

  • Exendin-4 treatment increased contractile VSMC markers (Calponin, SM22α) and restored spindle-like morphology.
  • Exendin-4 upregulated AMPK phosphorylation and increased Sirtuin1 (SIRT1) and FOXO3a protein levels.
  • Exendin-4-induced VSMC redifferentiation was dependent on the AMPK/SIRT1/FOXO3a pathway.

Conclusions:

  • Exendin-4 effectively regulates VSMC phenotype switching.
  • Exendin-4 promotes VSMC redifferentiation through the AMPK/SIRT1/FOXO3a signaling cascade.
  • This pathway modulation offers a potential therapeutic target for vascular remodeling diseases.
Keywords:
AMPKExendin-4Forkhead box O3aRe-differentiationSirtuin1Vascular smooth muscle cells

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