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Horm Metab Res 2008; 40(11): 794-800
DOI: 10.1055/s-2008-1081502
Animals, Clinical

© Georg Thieme Verlag KG Stuttgart · New York

Abdominal Adipose Tissue: Early Metabolic Dysfunction Associated to Insulin Resistance and Oxidative Stress Induced by an Unbalanced Diet

O. R. Rebolledo 1 , C. A. Marra 2 , A. Raschia 1 , S. Rodriguez 1 , J. J. Gagliardino 1
  • 1CENEXA – Center of Experimental and Applied Endocrinology (National University of La Plata-National Research Council, PAHO/WHO Collaborating Center), 60 y 120 La Plata, Argentina
  • 2INIBIOLP – Institute of Biochemical Research (National University of La Plata-National Research Council), 60 y 120 La Plata, Argentina
Further Information

Publication History

received 31.08.2007

accepted 09.04.2008

Publication Date:
11 July 2008 (online)

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Abstract

The possible contribution of early changes in lipid composition, function, and antioxidant status of abdominal adipose tissue (AAT) induced by a fructose-rich diet (FRD) to the development of insulin resistance (IR) and oxidative stress (OS) was studied. Wistar rats were fed with a commercial diet with (FRD) or without 10% fructose in the drinking water for 3 weeks. The glucose (G), triglyceride (TG), and insulin (I) plasma levels, and the activity of antioxidant enzymes, lyposoluble antioxidants, total glutathione (GSH), lipid peroxidation as TBARS, fatty acid (FA) composition of AAT-TG as well as their release by incubated pieces of AAT were measured. Rats fed with a FRD have significantly higher plasma levels of G, TG, and I. Their AAT showed a marked increase in content and ratios of saturated to monounsaturated and polyunsaturated FAs, TBARS, and catalase, GSH-transferase and GSH-reductase, together with a decrease in superoxide dismutase and GSH-peroxidase activity, and total GSH, α-tocopherol, β-carotene and lycopene content. Incubated AAT from FRD released in vitro higher amount of free fatty acids (FFAs) with higher ratios of saturated to monounsaturated and polyunsaturated FAs. Our data suggest that FRD induced an early prooxidative state and metabolic dysfunction in AAT that would favor the overall development of IR and OS and further development of pancreatic β-cell failure; therefore, its early control would represent an appropriate strategy to prevent alterations such as the development of type 2 diabetes.

Key words

abdominal adipose tissue metabolism - fructose-rich diet - fat tissue composition - fatty acid release - saturated and unsaturated fatty acids

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Correspondence

O. R. Rebolledo

Center of Experimental and Applied Endocrinology (National University of La Plata-National Research Council PAHO/WHO Collaborating Center)

60 y 120 La Plata

Argentina

Phone: +54/221/423 67 12

Fax: +54/221/422 20 81

Email: oscar_rebolledo@yahoo.com.ar

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