Rosiglitazone improves insulin sensitivity in nonobese subjects with impaired glucose tolerance: the role of adiponectin and C-reactive protein.
To evaluate the effects of rosiglitazone (ROS) on serum adiponectin and C-reactive protein (CRP) in nonobese subjects with impaired glucose tolerance (IGT), we enrolled 21 patients with body mass index < or =24 kg/m(2) to receive ROS 4 mg daily for 12 weeks. Fifteen age-, sex-, and body mass index-matched healthy subjects were recruited as controls. A 75-g oral glucose tolerance test (OGTT), hemoglobin A(1c), fasting glucose, insulin, C-peptide, lipid profiles, adiponectin, and CRP levels were determined before initiation and at the end of the 12-week ROS treatment. Insulin resistance and beta-cell function were calculated using the homeostasis model assessment method (HOMA-IR and HOMA-beta, respectively). Compared with healthy controls, the ROS-treated subjects had significantly higher glycemic indices, HOMA-IR, CRP, and glucose and insulin concentrations in response to OGTT, and lower HOMA-beta level. After 12 weeks of ROS therapy, the results showed statistically significant changes from baseline in 2-hour plasma glucose during OGTT (9.4 +/- 0.3 vs 8.3 +/- 0.4 mmol/L, P < .05), HOMA-IR (2.6 +/- 0.2 vs 1.9 +/- 0.3, P < .05), HOMA-beta (63.4 +/- 12.5 vs 90.1 +/- 13.0, P < .05), and glucose and insulin concentrations during OGTT in nonobese subjects with IGT. In addition, elevation of serum adiponectin and decrease in CRP levels were significantly found after ROS treatment. Of 21 patients treated with ROS, 5 subjects were converted to normal (converter), 1 progressed to diabetes, and 15 remained in IGT status (nonconverter). There was a significant amelioration in HOMA-IR (-2.10 +/- 1.03 vs -0.07 +/- 0.33, P < .05) without significant changes in adiponectin and CRP levels in converter compared with nonconverter. We conclude that ROS effectively enhanced insulin sensitivity and beta-cell function to improve adiponectin and CRP levels in nonobese patients with IGT. The amelioration of insulin resistance may be a major determinant to predict the conversion of IGT independent of the changes in adiponectin and CRP.
Division of Endocrinology and Metabolism, Tri-Service General Hospital, National Defense Medical Center, Taipei 114, Taiwan, ROC. metahung@yahoo.com
Yi-Jen
YJ
Hung
Shih-Hua
SH
Lin
Dee
D
Pei
Shi-Wen
SW
Kuo
Chang-Hsun
CH
Hsieh
Chih-Tsueng
CT
He
Chien
C
Hsing Lee
Sandra Chyi
SC
Fan
Wayne Huey-Herng
WH
Sheu
D052242:Adiponectin / Q000097:blood / Q000378:metabolism*; D001786:Blood Glucose / Q000032:analysis; D002097:C-Reactive Protein / Q000378:metabolism*; D003920:Diabetes Mellitus / Q000209:etiology; D018450:Disease Progression; D005260:Female; D018149:Glucose Intolerance / Q000097:blood / Q000150:complications / Q000188:drug therapy* / Q000503:physiopathology*; D005951:Glucose Tolerance Test; D006706:Homeostasis; D006801:Humans; D007004:Hypoglycemic Agents / Q000627:therapeutic use*; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D050417:Insulin-Secreting Cells; D008297:Male; D008875:Middle Aged; D000077154:Rosiglitazone; D045162:Thiazolidinediones / Q000627:therapeutic use*; D016896:Treatment Outcome
D052242:Adiponectin; D001786:Blood Glucose; D007004:Hypoglycemic Agents; D007328:Insulin; D045162:Thiazolidinediones; D000077154:Rosiglitazone; D002097:C-Reactive Protein