on November 18, 2002
Circulation. 2002
Published online before print November 18, 2002, doi: 10.1161/01.CIR.0000041046.32962.86
Published online before print November 18, 2002, doi: 10.1161/01.CIR.0000041046.32962.86
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Submitted on June 26, 2002
From Stanford University School of Medicine, Stanford, Calif (T.M., F.A., C.L., G.R., P.S.); Kronos Longevity Research Institute, Phoenix, Ariz (L.L.); and the Department of Veteran Affairs, Phoenix, Ariz (P.R.). * To whom correspondence should be addressed. E-mail: peter.reaven{at}med.va.gov.
Background—Plasma C-reactive protein (CRP) concentrations are increased in obese and/or hyperinsulinemic individuals. The goal of this study was to determine if the relation between insulin resistance and CRP was independent of obesity. Methods and Results—Plasma CRP concentrations were measured before and after 3 months of calorie restriction in 38 healthy, obese women. Steady-state plasma glucose (SSPG) concentration during a 180-minute infusion of octreotide, glucose, and insulin was used to stratify participants into insulin-resistant (IR, n=20) or insulin-sensitive (n=18) groups, similar in terms of mean age (46±2 versus 44±2 years), body mass index (32.0±0.4 versus 31.4±0.3 kg/m2), and waist circumference (96±2 versus 95±2 cm). Mean CRP (0.39±0.08 versus 0.12±0.03 mg/dL, P=0.003) concentrations were higher in the IR group, as were day-long plasma glucose and insulin responses (P<0.001). There was a significant correlation at baseline between CRP and day-long plasma integrated insulin response (r=0.47, P=0.001) but not between CRP and body mass index (r=0.14) or waist circumference (r=0.10). Weight loss was similar in the two groups (8.7±0.9 versus 8.4±0.8 kg) but was associated with significant (P<0.001) decreases in SSPG and CRP concentrations in the IR group only. Regression analysis showed that SSPG and day-long plasma insulin response were the only significant predictors of CRP concentration. Conclusions—CRP concentrations are elevated predominantly in obese individuals who are also insulin resistant and fall in parallel with weight loss-associated improvements in insulin resistance. The relation between CRP concentrations and insulin resistance is independent of obesity.
Revised on September 13, 2002
Accepted on September 13, 2002
Differentiation Between Obesity and Insulin Resistance in the Association With C-Reactive Protein
Tracey McLaughlin MD,
Key words: inflammation • insulin • risk factors • obesity • syndrome X
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