Abstract
Background
Adiponectin is a fat cell-secreted cytokine, which has been reported to improve insulin sensitivity and have antiatherogenic properties. However, it is still unclear whether resistin plays a significant role in the development of insulin resistance in humans. The aim of this study was to investigate the relationship of the adiponectin and resistin concentrations with insulin resistance, metabolic markers and adiposity in healthy and type 2 diabetic subjects.
Methods
Eighty-three type 2 diabetic and 139 healthy subjects were studied. Blood samples were drawn after fasting to determine the fasting plasma glucose, insulin, resistin, adiponectin, total cholesterol, triglyceride and HDL-cholesterol levels. The subcutaneous and visceral fat areas were measured at the umbilical level using computed tomography.
Results
The serum adiponectin concentrations were significantly lower in the diabetic (6.7 ± 2.3 µg/mL) than in the obese (8.2 ± 2.4 µg/mL, P<0.01) and non-obese subjects (9.9 ± 4.5 µg/mL, P<0.01). The serum resistin concentrations were Similar between the non-obese, obese and type 2 diabetic subjects. From a multiple regression analysis, the fasting glucose, HDL-cholesterol and HOMA-IR were found to be independent determinants of the log of the adiponectin level in the diabetes group. In healthy subjects, the gender, BMI, HOMA-IR, visceral fat area and HDL-cholesterol were associated with the log of the adiponectin level. However, the log of the resistin level was not associated with the markers of insulin resistance and obesity.
Figures and Tables
Fig. 1
Serum adiponectin concentrations in non-obese, obese, and type 2 diabetic subjects. Serum adiponectin concentrations were significantly lowered in diabetic subjects than non-diabetic subjects. Non-obese non-diabetic subjects showed higher adiponectin concentrations than those of obese subjects. *P< 0.05, **P< 0.01
![jkse-20-444-g001](/upload/SynapseData/ArticleImage/1008jkse/jkse-20-444-g001.jpg)
Fig. 2
Serum resistin concentrations in non-obese, obese, and type 2 diabetic subjects. Serum resistin concentrations were not different among non-obese, obese, and type 2 diabetic subjects.
![jkse-20-444-g002](/upload/SynapseData/ArticleImage/1008jkse/jkse-20-444-g002.jpg)
Fig. 3
Association between logarithmically transformed adiponectin concentrations and HOMA-IR (A) or BMI (B) in all subjects. There were negative correlations between HOMA-IR, BMI, and log adiponectin. Correlation coefficients and P values were calculated by Pearson correlation.
![jkse-20-444-g003](/upload/SynapseData/ArticleImage/1008jkse/jkse-20-444-g003.jpg)
Fig. 4
Association between logarithmically transformed resistin concentrations and HOMA-IR (A) or BMI (B) in all subjects. There were no correlations between HOMA-IR, BMI, and log resistin. Correlation coefficients and P values were calculated by Pearson correlation.
![jkse-20-444-g004](/upload/SynapseData/ArticleImage/1008jkse/jkse-20-444-g004.jpg)
Table 1
Baseline Characteristics of Study Subjects
![jkse-20-444-i001](/upload/SynapseData/ArticleImage/1008jkse/jkse-20-444-i001.jpg)
Results are expressed as the mean ± SD. *P<0.01 versus nonobese subjects; †P<0.01 versus obese subjects; ‡P<0.05 versus obese subjects. BMI: Body mass index, SC fat area: subcutaneous fat area, VSR: visceral fat vs. subcutaneous fat area ratio, HOMA-IR: homeostasis model assessment of insulin resistance.
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