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[Effect of IGF-1 on PI3K/PTEN signal pathway in vascular smooth muscle cell]

Xing-li Wu1, Ding-you Yang, Zhong-su Yang

  • 1Institute of Geriatric Cardiology, PLA General Hospital, Beijing 100853, China.

Zhongguo Ying Yong Sheng Li Xue Za Zhi = Zhongguo Yingyong Shenglixue Zazhi = Chinese Journal of Applied Physiology
|January 1, 2011
PubMed
Abstract

Insights

Insulin-like growth factor-1 (IGF-1) promotes vascular smooth muscle cell (VSMC) proliferation by activating phosphatidylinositol 3-kinase (PI3K) and inhibiting phosphatase and tensin homolog (PTEN). This pathway is crucial for VSMC growth.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Cardiovascular Research

Context:

  • Vascular smooth muscle cell (VSMC) proliferation is implicated in cardiovascular diseases.
  • Insulin-like growth factor-1 (IGF-1) is a known mitogen for VSMCs.
  • Understanding the underlying signaling pathways is critical for therapeutic development.

Purpose:

  • To elucidate the cellular signal transduction pathway mediating IGF-1-induced VSMC proliferation.
  • To investigate the roles of phosphatidylinositol 3-kinase (PI3K) and phosphatase PTEN in this process.

Summary:

  • IGF-1 significantly increased VSMC proliferation, measured by cell number and mitochondrial dehydrogenase activity.
  • Inhibition of PI3K with wortmannin blocked IGF-1-induced proliferation.
  • IGF-1 dose- and time-dependently inhibited PTEN activity, suggesting its involvement in the signaling cascade.

Impact:

  • This study reveals that IGF-1 promotes VSMC proliferation via PI3K activation and PTEN inhibition.
  • Findings provide a molecular basis for IGF-1's role in vascular remodeling.
  • Identifies potential therapeutic targets for conditions involving VSMC hyperplasia.

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