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Ectopic expression of RBP4 impairs the insulin pathway and inguinal fat deposition in mice

Jia Cheng1, Yuefeng Li, Guofang Wu

  • 1College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, 712100, China.

Journal of Physiology and Biochemistry
|March 5, 2014
PubMed

Insights

Retinol-binding protein 4 (RBP4) was found to hinder fat cell growth and impair insulin signaling in mice. This suggests RBP4 plays a role in reducing fat deposition and improving insulin sensitivity.

Area of Science:

  • Metabolism and Endocrinology
  • Adipocyte Biology
  • Molecular Biology

Background:

  • Retinol-binding protein 4 (RBP4) is linked to systemic insulin resistance.
  • The precise role of RBP4 in fat deposition remains largely uncharacterized.

Purpose of the Study:

  • To investigate the function of RBP4 in regulating inguinal fat deposition.
  • To determine the effect of RBP4 on adipocyte insulin signaling in vivo.

Main Methods:

  • Adenovirus-mediated RBP4 overexpression in mice via intraperitoneal injection.
  • Assessment of adipocyte size and insulin response in inguinal fat tissue.
  • Validation of adenoviral vectors for in vivo gene manipulation.

Main Results:

  • Ectopic RBP4 expression reduced inguinal fat deposition by decreasing adipocyte size.
  • Exogenous RBP4 introduction attenuated the response of inguinal adipocytes to insulin.
  • Adenoviral vectors proved effective for in vivo recombinant protein overexpression.

Conclusions:

  • RBP4 impairs in vivo adipogenesis, partly by repressing the insulin signaling pathway.
  • RBP4 may represent a therapeutic target for metabolic disorders involving insulin resistance and altered fat deposition.

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