Obesity Clinical Trial
Official title:
Alterations in Phosphorylated Fetuin-A, a Novel Regulator of Insulin Action in Insulin Resistance and Metabolic Syndrome: Effects of Lifestyle Modification
Fetuin-A has been identified as a novel physiological regulator of insulin action in vitro, in intact cells and in vivo in animals. Previous research has shown that circulating levels of fetuin-A were increased in animal models of insulin resistance and diabetes. Additionally, several human investigation studies demonstrate a correlation of fetuin-A levels with body mass index, insulin resistance, and a fatty liver. Recently, the investigators have elucidated the role of fetuin-A phosphorylation in the regulation of insulin action, demonstrating that phosphorylation is critical for the inhibitory activity of fetuin-A. The objectives of this study are twofold: (1) Quantitate phosphorylated fetuin-A levels in individuals with insulin resistance and metabolic syndrome, and (2) Investigate the effects of lifestyle modifications (acute or chronic exercise and dietary modifications) on fetuin-A phosphorylation and insulin sensitivity.
There are several objectives of this study: (1) Quantitate phosphorylated fetuin-A levels and the daily variation in these levels in individuals with insulin resistance and metabolic syndrome; (2) Investigate the short-term responses of fetuin-A phosphorylation and changes in insulin resistance that occur with a single session of aerobic exercise; (3) Characterize and compare the total and temporal changes in fetuin-A phosphorylation and insulin resistance that occur with an 8 to 10% weight loss induced by chronic exercise training and dietary modification, and; (4) Investigate the influence of weight loss on the short-term responses of fetuin-A phosphorylation and changes in insulin resistance that occur with a single session of aerobic exercise. Our hypothesis is that phosphofetuin-A levels are tightly correlated with insulin resistance and that lifestyle modifications will improve insulin sensitivity and decrease phosphorylated fetuin-A levels. ;
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