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Effect of rosiglitazone on HDL metabolism in subjects with metabolic syndrome and low HDL

Journal of Lipid Research(2011)

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Abstract
Treatment with the peroxisome proliferator-activated receptor gamma agonist rosiglitazone has been reported to increase HDL-cholesterol (HDL-C) levels, although the mechanism responsible for this is unknown. We sought to determine the effect of rosiglitazone on HDL apolipoprotein A-I (apoA-I) and apoA-II metabolism in subjects with metabolic syndrome and low HDL-C. Subjects were treated with placebo followed by rosiglitazone (8 mg) once daily. At the end of each 8 week treatment, subjects (n = 15) underwent a kinetic study to measure apoA-I and apoA-II production rate (PR) and fractional catabolic rate. Rosiglitazone significantly reduced fasting insulin and high-sensitivity C-reactive protein (hsCRP) and increased apoA-II levels. Mean apoA-I and HDL-C levels were unchanged following rosiglitazone treatment, although there was considerable individual variability in the HDL-C response. Rosiglitazone had no effect on apoA-I metabolism, whereas the apoA-II PR was increased by 23%. The change in HDL-C in response to rosiglitazone was significantly correlated with the change in apoA-II concentration but not to changes in apoA-I, measures of glucose homeostasis, or hsCRP. Treatment with rosiglitazone significantly increased apoA-II production in subjects with metabolic syndrome and low HDL-C but had no effect on apoA-I metabolism. The change in HDL-C in response to rosiglitazone treatment was unrelated to effects on apoA-I, instead being related to the change in the metabolism of apoA-II.-Millar, J. S., K. Ikewaki, L. T. Bloedon, M. L. Wolfe, P. O. Szapary, and D. J. Rader. Effect of rosiglitazone on HDL metabolism in subjects with metabolic syndrome and low HDL. J. Lipid Res. 2011. 52: 136-142.
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Key words
apolipoprotein A-I,stable isotope,thiazolidinedione,lipoprotein kinetics,high density lipoprotein
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