1. The purpose of this study is to determine whether Sitagliptin therapy suppress glucagon release and improve glucose control in Chinese type 2 diabetic. 2. There are different effects of Sitagliptin therapy on blood glucose regulation, pancreatic alpha \& beta cell function are different in lean (BMI\<25) and overweight (BMI\>25) Chinese type 2 diabetics. 3. The purpose of this study is to determine whether glucagon release may contribute over 30% to the hyperglycemia in Chinese type 2 diabetics.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
85
Sitagliptin 100 mg QD for 12 weeks
Fuwai Hospital
Beijing, China
Change From Baseline in Hemoglobin A1c (HbA1c)
Time frame: Baseline to 12 weeks
Change From Baseline in Fasting Plasma Glucose (FPG)
Time frame: Baseline to 12 weeks
Change From Baseline in Postprandial Plasma Glucose (PPG)
Time frame: Baseline to 12 weeks
Change From Baseline in Insulin Sensitivity
The insulin sensitivity was detected by evaluating the glucose infusion rate (GIR) with euglycemic hyperinsulinemic clamp test.
Time frame: Baseline to 12 weeks
Change From Baseline in Insulin Sensitivity in Patients With Different BMI
The insulin sensitivity was detected by evaluating the glucose infusion rate (GIR) with euglycemic hyperinsulinemic clamp test.
Time frame: Baseline to 12 weeks
Change From Baseline in Pancreatic β Cell Function
The early phase insulin response (△I30/△G30) was adopted to determine β cell function.
Time frame: Baseline to 12 weeks
Change From Baseline in Pancreatic β Cell Function in Patients With Different BMI
The early phase insulin response (△I30/△G30) was adopted to determine β cell function.
Time frame: Baseline to 12 weeks
Change From Baseline in Pancreatic α Cell Function
The glucagon-AUC was adopted to show pancreatic α cell function.
Time frame: Baseline to 12 weeks
Change From Baseline in Pancreatic α Cell Function in Patients With Different BMI
The glucagon-AUC was adopted to show pancreatic α cell function.
Time frame: Baseline to 12 weeks
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