Table of Contents
ISRN Inflammation
Volume 2014, Article ID 641096, 8 pages
http://dx.doi.org/10.1155/2014/641096
Research Article

Substitution of Soy Protein for Casein Prevents Oxidative Modification and Inflammatory Response Induced in Rats Fed High Fructose Diet

1Department of Biochemistry and Biotechnology, Annamalai University, Annamalai Nagar, Tamil Nadu 608002, India
2Department of Pathology, Mahatma Gandhi Medical College and Research Institute, Puducherry 607402, India

Received 8 January 2014; Accepted 16 March 2014; Published 15 April 2014

Academic Editors: E.-B. Kurutas and M. Yamaoka-Tojo

Copyright © 2014 S. Sreeja et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fructose-rich diet is known to cause metabolic dysregulation, oxidative stress, and inflammation. We aimed to compare the effects of two dietary proteins of animal and plant origins on fructose-induced oxidative stress and inflammatory changes in liver. Wistar rats were fed either starch or fructose (60%) diet with casein or soy protein (20%) as the protein source for 8 weeks. Glucose and insulin, glycated hemoglobin and fructosamine, AOPP, and FRAP were determined in circulation. Intracellular ROS, oxidatively modified proteins (4-HNE and 3-NT adducts), adiponectin, TNF-α, IL-6 and PAI-1 mRNA expression, phosphorylation and activation of JNK and IKKβ, and NF-κB binding activity were assayed in liver. In comparison with starch fed group, fructose + casein group registered significant decline in antioxidant potential and increase in plasma glucose, insulin, and glycated proteins. Increased ROS production, 4-HNE and 3-NT modified proteins, JNK and IKKβ activation, and NF-κB binding activity were observed in them along with increased gene expression of PAI-1, IL-6, and TNF-α and decreased adiponectin expression. Substitution of soy protein for casein reduced oxidative modification and inflammatory changes in fructose-fed rats. These data suggest that soy protein but not casein can avert the adverse effects elicited by chronic consumption of fructose.