Publication date: July 2016
Source:International Journal of Biological Macromolecules, Volume 88
Author(s): Shaziya Allarakha, Kiran Dixit, Mohammad Shoaib Zaheer, Sheelu Shafiq Siddiqi, Moinuddin, Asif Ali
ObjectiveThis study aimed to assess the changes induced in HSA upon fructose-modification and to use the modified protein as an antigen for studying the presence of antibodies in diabetic patients. Further, magnitude of oxidative stress was also assessed.MethodsHSA was modified with fructose, changes induced were studied by DSC measurements and near-UV CD. The binding characteristics of antibodies in the sera of diabetes patients to native and modified-HSA was assessed by ELISA and band shift assay. The oxidative stress in these patients was studied by carbonyl content estimation, FRAP assay and TBARS determinationResultsDSC revealed that fructose modified-HSA was more thermostable than its native form. Changes in tertiary structure of fructose-modified HSA were seen in near-UV CD. Patient studies showed that fructose-modified HSA acts as a potent immunogen compared to its native form and the levels of antibodies against fructose-modified HSA served as a parameter for tracking the glycemic control and oxidative stress parameters (carbonyl content, FRAP value and MDA level) in diabetic patients.ConclusionsFructose-modification of HSA causes perturbations in its structure and function, thereby, making the protein antigenic besides decreasing its antioxidant capacity. This study suggests that fructose-modified-HSA is an important contributor in diabetic pathophysiology.
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