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

• Published in: Regulatory peptides Vol. 178; no. 1-3; pp. 64 - 70
• Main Authors: Santos, Sérgio Henrique S., Fernandes, Luciana Rodrigues, Pereira, Camila Santos, Guimarães, André L. Senna, de Paula, Alfredo M.B., Campagnole-Santos, Maria José, Alvarez-Leite, Jacqueline Isaura, Bader, Michael, Santos, Robson Augusto S.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 10.10.2012
• Subjects: Adipokines - blood; Adiposity; Angiotensin I - blood; Angiotensin-(1–7); Animals; Blood Glucose; Cholesterol, HDL - blood; Diet, High-Fat - adverse effects; Epididymis - metabolism; Epididymis - pathology; Hyperlipidic diet; Inflammation; Inflammation Mediators - metabolism; Interleukin-1beta - genetics; Interleukin-1beta - metabolism; Intra-Abdominal Fat - metabolism; Intra-Abdominal Fat - pathology; Male; Metabolism; Obesity; Obesity - blood; Obesity - etiology; Obesity - pathology; Oxidative Stress; Peptide Fragments - blood; Rats; Rats, Sprague-Dawley; Rats, Transgenic; Tumor Necrosis Factor-alpha - genetics; Tumor Necrosis Factor-alpha - metabolism; Obesity; Inflammation; Angiotensin-(1–7); Metabolism; Hyperlipidic diet
• ISSN: 0167-0115; 1873-1686
• DOI: 10.1016/j.regpep.2012.06.009

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. Transgenic rats expressing an Ang-(1–7)-producing fusion protein (TGR L-3292) and Sprague Dawley (SD) control rats 4weeks old were treated for 8weeks with a 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 the end of the experiment plasma lipid 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. 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. Taken together, these results show that chronic high circulating angiotensin-(1–7) levels protect against metabolic stress induced by a high-fat diet decreasing the proinflammatory profile of adipose tissue. ► Angiotensin-(1–7) peptide prevented metabolic diet-disturbance. ► High plasma levels of angiotensin-(1–7) decrease adipose pro-inflammatory markers. ► Despite the high-fat diet, lipid metabolism was improved in transgenic rats.