Modulation of Human Myocardial Metabolism by GLP-1 Dose Response
The objective of this proposal is to provide quantitative dose-response data for effects of GLP-1 on myocardial glucose uptake in healthy control subjects and obese type 2 diabetic subjects, in support of the design of later studies evaluating therapeutic applications of GLP-1 to heart disease.
Aim 1: To measure the effects of GLP-1 infusion on myocardial fuel selection in lean healthy humans under fasting (fatty acid-dominant) conditions. Four groups of 10 lean healthy subjects will be studied during infusions of 0 (saline control), 0.5, 1.5, and 4.0 pmol/kg/min GLP-1 (one study per subject). Cardiac metabolism will be measured using PET, using a dual-tracer approach which allows measurement of myocardial glucose uptake (the primary endpoint) along with total oxidation rate and myocardial perfusion (secondary endpoints). In concert with measures of circulating metabolites and regulatory hormones, the investigators will produce the most comprehensive assessment of actions of GLP-1 on myocardial metabolism in humans to date. Effects of each dose will be compared to the saline control, plus the investigators will combine all data and use nonlinear curve-fitting to derive sensitivity (ED50) and maximal responses for GLP-1 effects on myocardial glucose uptake.
Aim 2: To measure the effects of GLP-1 infusion on myocardial fuel selection in obese type 2 diabetic humans under fasting (fatty acid-dominant) conditions Four groups of 10 obese type 2 diabetic subjects will be studied during infusions of 0, 0.5, 1.5, and 4.0 pmol/kg/min GLP-1 as under Aim 1. Analyses will be parallel to those described under Aim 1. Results from Aims 1 and 2 will be combined to allow direct comparison of the dose-response between nondiabetic control and type 2 diabetic subjects.
No literature has been published to inform dose selection in the design of clinical trials of GLP-1 for modulation of heart fuel selection. With our expertise and experience in PET measurement of heart metabolism in diabetes, the investigators are uniquely positioned to fill this gap in knowledge. These studies are a necessary preamble to further evaluation of the potential for GLP-1 based treatments in heart disease.
研究概览
研究类型
注册 (实际的)
阶段
- 阶段2
- 第三阶段
联系人和位置
学习地点
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Indiana
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Indianapolis、Indiana、美国、46202
- Indiana Clinical Research Center
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参与标准
资格标准
适合学习的年龄
接受健康志愿者
有资格学习的性别
描述
Inclusion Criteria:
- Age 18-60
- Lean subjects will be defined as having a BMI <25 kg/m2, in good general health, taking no regular medications
- Diabetic subjects will be obese (BMI >30 kg/m2 but <40 kg/m2), HbA1c 7.0-10.0%, treated with diet and exercise plus oral agents or injected insulin. All diabetic subjects will be treated with injected insulin for 2 weeks prior to study, to avoid potential confounding effects of other antidiabetic agents.
Exclusion Criteria:
- Chronic illnesses or infections (other than type 2 diabetes)
- Known coronary artery disease or abnormal ECG on screening evaluation
- Blood pressure > 160/100 mmHg on two occasions during screening evaluations. Current use of 3 or fewer blood pressure medications with blood pressure below this cutpoint will be acceptable.
- Total cholesterol > 240 mg/dL. Current use of 2 or fewer lipid lowering agents with cholesterol below this cutpoint will be acceptable.
- Diabetic subjects: Treatment with a GLP-1 agonist or DPP4 inhibitor within the past 6 months
- Known intolerance to injected GLP-1 agonist
- Treatment with PPAR gamma agonists currently or within the past 6 months
- Recognized microvascular complications (retinopathy, nephropathy, neuropathy)
- Unwillingness or inability to use injected insulin for the purposes of this study
- Chronic pain or other physical conditions which limit ability to remain supine for the duration of the study protocol
- History of claustrophobia, musculoskeletal or other factors which would result in an inability to comfortably remain within PET scanner gantry for the duration of the imaging protocol
- Occupational, investigational or other known radiation exposure which, together with the planned radiologic studies, will result in greater than 500 mrem total exposure in a contiguous 12 month period
- For female participants, current pregnancy
学习计划
研究是如何设计的？
设计细节
- 主要用途：治疗
- 分配：非随机化
- 介入模型：并行分配
- 屏蔽：单身的
武器和干预
参与者组/臂 |
干预/治疗 |
|---|---|
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其他：Saline
12 hour saline (control) infusion prior to PET study
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Normal saline placebo infusion for 12 hours prior to PET study
其他名称：
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实验性的：GLP-1 Low dose
GLP-1 Low Dose: 0.5 pmol/kg/min for 12 hours prior to PET study
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0.5mmol/kg/hr GLP-1 for 12 hours prior to PET study
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实验性的：GLP-1 Mid-Range Dose
GLP-1 Mid-Range Dose: 1.5 pmol/kg/min for 12 hours prior to PET study
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1.5mmol/kg/min for 12 hours prior to PET study
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实验性的：GLP-1 High Dose
GLP-1 High Dose: 4.0 pmol/kg/min for 12 hours prior to PET study
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4.0mmol/kg/min GLP-1 for 12 hours prior to PET study
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研究衡量的是什么？
主要结果指标
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
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Myocardial Glucose Uptake.
大体时间：After 12 hours of glucagon-like peptide 1 (GLP-1) exposure
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Myocardial glucose uptake measured using 18FDG PET, quantified using a 3-compartment model with a lumped constant of 1.0.
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After 12 hours of glucagon-like peptide 1 (GLP-1) exposure
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次要结果测量
结果测量 |
措施说明 |
大体时间 |
|---|---|---|
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Myocardial Blood Flow
大体时间：After 12 hours of GLP-1 exposure
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Myocardial perfusion derived from acetate kinetics
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After 12 hours of GLP-1 exposure
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Myocardial Total Oxidation Rate
大体时间：After 12 hours of GLP-1 exposure
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MVO2 derived from acetate kinetics
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After 12 hours of GLP-1 exposure
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Cardiac Index
大体时间：After 12 hours of GLP-1 exposure
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Impedance cardiography-derived measurement of cardiac index, assessed following 12 hour exposure to treatment condition concurrent with the PET measurements.
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After 12 hours of GLP-1 exposure
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GLP-1 Concentrations
大体时间：After 12 hours of GLP-1 exposure
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Achieved GLP-1 concentrations at the end of the 12 hour treatment exposure
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After 12 hours of GLP-1 exposure
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合作者和调查者
调查人员
- 首席研究员：Kieren J Mather, MD、Indiana University
研究记录日期
研究主要日期
学习开始
初级完成 (实际的)
研究完成 (实际的)
研究注册日期
首次提交
首先提交符合 QC 标准的
首次发布 (估计)
研究记录更新
最后更新发布 (估计)
上次提交的符合 QC 标准的更新
最后验证
更多信息
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