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An Adipocyte Cell Culture Model to Study the Impact of Protein and Micro-RNA Modulation on Adipocyte Function
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[Molecular mechanism of SH2B1 in regulating JAK2/IRS2 during obesity development]

Chaojun Duan1, Can'e Tang, Lan Liao

  • 1Key Laboratory of Cancer Proteomics, Ministry of Health of China, Xiangya Hospital, Central South University, Changsha 410008, China. duancjxy@126.com

Zhong Nan Da Xue Xue Bao. Yi Xue Ban = Journal of Central South University. Medical Sciences
|April 3, 2010
PubMed
Abstract

Insights

SH2B1 enhances leptin signaling through the JAK2/IRS2 pathway, improving leptin sensitivity. Its absence causes leptin resistance and significant weight gain in mice.

Area of Science:

  • Molecular Biology
  • Endocrinology
  • Physiology

Background:

  • Leptin signaling regulates energy balance and body weight.
  • The JAK2/IRS2 pathway is crucial for leptin signal transduction.
  • The role of SH2B1 in leptin signaling requires further elucidation.

Purpose of the Study:

  • To investigate the effect of SH2B1 on leptin signal transduction via JAK2/IRS2.
  • To determine the biological function of SH2B1 in regulating body weight and leptin sensitivity.

Main Methods:

  • In vitro kinase assays and Western blots analyzed protein phosphorylation.
  • ELISA measured plasma leptin levels in wild-type and SH2B1 knockout mice.
  • Postnatal growth and body weight were monitored over 27 weeks.

Main Results:

  • SH2B1 significantly enhanced leptin-stimulated JAK2 and IRS2 phosphorylation.
  • SH2B1 deficiency impaired leptin-induced JAK2/IRS2 activation in mice.
  • SH2B1 knockout mice exhibited leptin resistance and rapid weight gain.

Conclusions:

  • SH2B1 acts as an endogenous enhancer of leptin sensitivity.
  • SH2B1 is essential for maintaining normal body weight through the leptin JAK2/IRS2 pathway.

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