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PPAR-γ agonist stabilizes KLF4 protein via activating Akt signaling and reducing KLF4 ubiquitination

Yan Sun1, Bin Zheng1, Xin-hua Zhang1

  • 1Department of Biochemistry and Molecular Biology, The Key Laboratory of Neural and Vascular Biology, China Administration of Education, Hebei Medical University, No. 361 Zhongshan East Road, Shijiazhuang 050017, China.

Biochemical and Biophysical Research Communications
|December 11, 2013
PubMed

Insights

The PPAR-γ agonist pioglitazone increases Krüppel-like factor 4 (KLF4) protein levels in vascular smooth muscle cells by enhancing KLF4 protein stability. This process involves the Akt signaling pathway and reduced KLF4 ubiquitination.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Peroxisome proliferator activated receptor γ (PPAR-γ) is crucial for cell cycle regulation, differentiation, and apoptosis.
  • Krüppel-like factor 4 (KLF4) influences vascular smooth muscle cell (VSMC) phenotype.
  • Both PPAR-γ and KLF4 are implicated in VSMC proliferation and differentiation, but their direct relationship remains unclear.

Purpose of the Study:

  • To elucidate the relationship between PPAR-γ and KLF4 in VSMCs.
  • To investigate the mechanism by which PPAR-γ affects KLF4 expression.

Main Methods:

  • Treatment of VSMCs with PPAR-γ agonist pioglitazone.
  • Assessment of KLF4 protein and gene expression.
  • PPAR-γ overexpression and knockdown experiments.
  • Analysis of KLF4 ubiquitination and protein stability.
  • Investigation of Akt signaling pathway activation.

Main Results:

  • Pioglitazone increased KLF4 protein levels without affecting KLF4 gene transcription.
  • PPAR-γ activation was essential for the pioglitazone-induced increase in KLF4.
  • Pioglitazone enhanced KLF4 protein stability by reducing its ubiquitination.
  • This stabilization was linked to the activation of the Akt signaling pathway.

Conclusions:

  • PPAR-γ agonist pioglitazone stabilizes KLF4 protein in VSMCs.
  • The mechanism involves Akt signaling activation and decreased KLF4 ubiquitination.
  • This study provides new insights into the cross-regulation of PPAR-γ and KLF4 in VSMCs.
Keywords:
Akt signalingKLF4PPAR-γProtein stabilityVSMC

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