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Increased circulating angiotensin-(1-7) protects white adipose tissue against development of a proinflammatory state stimulated by high-fat diet

Authors

  • S.H.S. Santos
  • L. Rodrigues Fernandes
  • C. Santos Pereira
  • A.L. Senna Guimaraes
  • A.M.B. de Paula
  • M.J. Campagnole-Santos
  • J.I. Alvarez-Leite
  • M. Bader
  • R.A.S. Santos

Journal

  • Regulatory Peptides

Citation

  • Regul Pept 178 (1-3): 64-70

Abstract

  • INTRODUCTION: The aim of the present study was to evaluate the effect of a transgenic-induced chronic increase of Ang-(1-7) on the expression of inflammatory markers in adipose tissue and the metabolic profile in rats treated with high-fat diet. Research Design and Methods Transgenic rats expressing a Ang-(1-7)-producing fusion protein (TGR L-3292) and Sprague Dawley (SD) control rats 4weeks old were treated for 8weeks with high-fat diet. Food intake and body weight were measured once a week. Glucose-tolerance and insulin sensitivity tests were performed one week before the sacrifice. At end of experiment plasma lipids concentrations were measured in TGR and SD rats. Adipose tissue were weighted and corrected by the body weight. Proinflammatory markers in adipose tissue were analyzed using Western-blotting, real time-PCR and immunohistochemistry. RESULTS: High-fat diet TGR rats presented increased HDL cholesterol levels and decreased abdominal fat mass, without changes in food intake. In addition, rats with increased Ang-(1-7) levels had lower body weight. Molecular analysis revealed decreased IL-1β and COX-2 in adipose tissue. CONCLUSIONS: Taken together, these results show that chronic high circulating angiotensin-(1-7) levels protect against metabolic stress induced by high-fat diet decreasing the proinflammatory profile of adipose tissue.


DOI

doi:10.1016/j.regpep.2012.06.009