Mechanism of Reduced Response to DPP-4 Inhibitor in Patients With Type 2 Diabetes Mellitus
试验速览
- 阶段
- 4 期
- 状态
- 已完成
- 入组人数
- 24
- 试验地点
- 2
- 主要终点
- Plasma Concentration of Active Glucagon-like Peptide 1 (GLP-1) Before and After Sitagliptin Treatment
研究概览
简要总结
The purpose of this study is to confirm the mechanism of reduced response to DPP-4 inhibitor in some patients with type 2 diabetes and evaluate appropriate patients to treat with DPP-4 inhibitor
详细描述
Sitagliptin, a DPP-4 inhibitor was used as an incretin enhancer in clinical practice first. In clinical trials, sitagliptin showed effective control of blood glucose level in type 2 diabetes and 100 mg once daily with metformin was similar to sulfonylurea (glipizide) with metformin in lowering HbA1c. Mostly in practice, stable blood glucose levels were maintained after change of sulfonylurea to sitagliptin in type 2 diabetes treatment. However, in some cases, there were abrupt severe hyperglycemia and uncontrolled blood glucose level after drug change to sitagliptin.
Several mechanism could be considered for reduced response to DPP-4 inhibitor in some type 2 diabetes patients. Firstly, significantly reduced secretion of glucagon-like peptide 1 (GLP-1) more than expected in diabetes or functional defect of GLP-1 activity could be the mechanism of loss of GLP-1 effect irrespective of DPP-4. Secondly, mutation or functional defect of DPP-4 enzyme could not be inhibited by DPP-4 inhibitor. Thirdly, GLP-1 receptor mutation or other defect in β-cell responsiveness to GLP-1 leads to reduction of response to DPP-4 inhibitor.
研究设计
- 研究类型
- Interventional
- 分配方式
- Non Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- None
入排标准
- 年龄范围
- 20 Years 至 70 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Type 2 diabetic patients with less than 15 yrs of disease duration
- •BMI between 22-27 kg/m2
- •HbA1c ≤ 9% at recruitment
- •Study group
- •After change sulfonylurea to sitagliptin in case of metformin and sulfonylurea therapy
- •Increase of fasting blood glucose over 20 mg/dL or postprandial glucose over 30 mg/dL within several days or
- •Increase of HbA1c over 1% within 2-3 months without abrupt increase of blood glucose levels within several days
- •Sulfonylurea dose : less than glimepiride 4mg or gliclazide 120mg or glibenclamide 10mg
- •Metformin dose : 500~2000mg
- •Reduced response to sitagliptin should be made a decision by investigators after understanding the condition of patients surely.
- •Control group
- •Age, sex, BMI matched patients with same condition of study patients
- •After change sulfonylurea to sitagliptin in case of metformin plus sulfonylurea therapy, no change of blood glucose levels like above or stable HbA1c change within 1% within 2-3 months
排除标准
- •Other causes of increase of blood glucose levels except drug change
- •Patients with history of insulin treatment
- •Patients taking thiazolidinediones, alpha-glucosidase inhibitors, GLP-1 analogue or DPP-4 inhibitors
- •Patients with renal, hepatic dysfunction
- •Patients with diabetic complications such as coronary heart disease, cerebrovascular disease, proliferative diabetic retinopathy or diabetic gastroparesis
- •Patients taking medications affecting glucose level
研究组 & 干预措施
study group
sitagliptin hypo-response patients
干预措施: Sitagliptin (Drug)
control group
sitagliptin response patients
干预措施: Sitagliptin (Drug)
结局指标
主要结局
Plasma Concentration of Active Glucagon-like Peptide 1 (GLP-1) Before and After Sitagliptin Treatment
时间窗: 0, 15, 30, 45, 60, 90, 120, 180 min pre and post-dose
Plasma concentrations of active GLP-1 were measured at 0, 15, 30, 45, 60, 90, 120 and 180 min during the meal tolerance test (MTT). Second measurement of active GLP-1 were measured with MTT after taking sitagliptin 100 mg 1 hour before the test.
Plasma Concentration of Total GLP-1 Before and After Sitagliptin Treatment
时间窗: 0, 15, 30, 45, 60, 90, 120, 180 min pre and post-dose
Plasma concentrations of total GLP-1 were measured at 0, 15, 30, 45, 60, 90, 120 and 180 min during the meal tolerance test. Second measurement of total GLP-1 were measured with MTT after taking sitagliptin 100 mg 1 hour before the test.
Plasma Concentration of Total Glucose-dependent Insulinotropic Polypeptide (GIP) Before and After Sitagliptin Treatment
时间窗: 0, 15, 30, 45, 60, 90, 120, 180 min pre and post-dose
Plasma concentrations of total GIP were measured at 0, 15, 30, 45, 60, 90, 120 and 180 min during the meal tolerance test. Second measurement of total GIP were measured with MTT after taking sitagliptin 100 mg 1 hour before the test.
Change in AUC of Active GLP-1, Total GLP-1 and Total GIP Between Before and After Sitagliptin Treatment
时间窗: 0, 15, 30, 45, 60, 90, 120, 180 min pre and post-dose
Plasma concentrations of active GLP-1, total GLP-1 and total GIP were measured at 0, 15, 30, 45, 60, 90, 120 and 180 min during the meal tolerance test. Second measurements were measured with MTT after taking sitagliptin 100 mg 1 hour before the test. Comparisons were made using Area under the curve (AUC) values and incremental area under the curve (ΔAUC) of active GLP-1, total GLP-1 and total GIP before and after the addition of sitagliptin.
次要结局
- Differences of DPP-4 Activity After Sitagliptin Treatment Between Responder and Non-responder Groups(0, 15, 30, 45, 60 min post-dose)
研究者
Ji Hyun Kim
Clinical Assistant Professor
The Catholic University of Korea