B-type Natriuretic Peptide Affects the Initial Response to Intravenous Glucose in a Placebo-controlled Cross-over Study in Healthy Volunteers
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 10
- 试验地点
- 1
- 主要终点
- glucose
研究概览
简要总结
Rationale: B type natriuretic peptide (BNP) is a hormone released from cardiomyocytes in response to myocyte stretching and serves as a reliable biomarker in the diagnosis of cardiac dysfunction and heart failure. Recent observations speak for a distinct connection between chronic heart failure and diabetes mellitus.
Objective: The study was set out to investigate the role of BNP on parameters of glucose metabolism in a placebo controlled cross-over study in healthy volunteers.
Methods and Results: Ten participants (25±1 years; BMI 23±1 kg/m2; fasting glucose 83±2 mg/dL) received either placebo or 3 pmol/kg/min BNP 32 intravenously for 4h. One hour after beginning the BNP/placebo infusion, a 3h intravenous glucose tolerance test (0.33 g/kg glucose + 0.03 U/kg insulin at 20 min) was performed and plasma glucose, insulin and C peptide were frequently measured. BNP increased the initial glucose distribution volume (13±1 %BW vs. 11±1, P<0.002), leading to an overall reduction of glucose concentration (P<0.001) especially during the initial 20 min of the test (P=0.001), accompanied by a reduction of the initial C peptide levels (4.3±0.4 ng/mL vs. 4.9±0.3, P=0.015). BNP had no impact on beta cell function, insulin clearance or insulin sensitivity.
Discussion: Intravenous administration of BNP increases glucose initial distribution volume and lowers plasma glucose concentrations after a glucose load without affecting beta cell function or insulin sensitivity what speaks for the concept that BNP is not diabetogenic, but improves the metabolic status in patients with heart failure. This opens new questions regarding BNP induced differences in glucose availability and signalling in several organs/tissues.
详细描述
In one of our recent studies we investigated insulin sensitivity (OGIS index) and insulin secretion (beta cell function with the insulinogenic index, IGI) in patients with heart insufficiency by frequently sampled oral glucose tolerance test (21). Insulin sensitivity was impaired in CHF compared to control (OGIS: 354±14 ml/min/m2 vs. 450±20; p<0.003). Also beta cell function was reduced (IGI: 100±14 vs. 150±45 pmolINS/pmolGLUC). Interestingly a significant inverse correlation exists between BNP and IGI (r=0.41, p<0.05) (21). The relationship between BNP and glucose metabolism has only been partially investigated. Plasma BNP rises in response to hyperglycemia, but is not influenced by hyperinsulinemia (22, 23). On the other side, the physiological role of BNP on beta cell function and insulin sensitivity has not been investigated to date. As BNP levels rise with the degree of heart insufficiency and insulin resistance correlates to the degree of cardiomyopathy, we hypothesize that BNP influences glucose metabolism in healthy men.
One gold standard investigation of both beta cell function and peripheral insulin sensitivity is the insulin-modified frequently sampled intravenous glucose tolerance test (FSIGT). The FSIGT consists in giving intravenously a glucose bolus at time point 0 followed by an intravenous administration of insulin at time point 20 minutes (18,19, 20). The determination of glucose, insulin and C-peptide at frequent intervals till time point 180 minutes allows the calculation of the acute insulin response, glucose effectiveness, insulin clearance and insulin sensitivity through the minimal model analysis (13) The intravenous administration of 3 pmol/kg/min BNP achieves a plateau of increased BNP plasma concentrations after 60 minutes. In previous publications, this infusion was administered during 4 hours, achieving a steady state plasma BNP between time points 60 minutes and 240 minutes (17). Using this already established protocol, we aim to maintain constantly high plasma BNP levels throughout the three hours of the FSIGT. The combination of both BNP (17) and FSIGT (13) protocols in an interventional study will be an adequate means of investigating the impact of BNP on glucose metabolism in healthy subjects.
The present study aims to investigate the effect of intravenous infusion of BNP-32 (American Peptide, Calif., US) on the beta cell function and insulin sensitivity during FSIGT in healthy volunteers.
-65, -60, -30, 0, 3, 4, 5, 6, 8, 10, 14, 19, 22, 27, 30, 35, 40, 50, 60, 70, 90, 100, 120, 140, 150 and 180 min for the measurement of glucose, insulin and C-peptide (8 ml per time point: time points -30, 0, 3, 4, 5, 6, 8, 10, 14, 19, 22, 27, 30, 35, 40, 50, 70, 100, 140 and 180 min), for the measurement of BNP and NT-proBNP (4 ml per time point: time points -65, -60, -30, 0, 30, 60, 90, 120, 150 and 180 min) and for the measurement of plasma sodium, potassium and creatinine (8 ml per time point: time points -60, 60 and 180 minutes).
Primary outcome parameter is area under the curve of insulin (AUCinsulin) from time point -30 to 180 min.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Basic Science
- 盲法
- Single (Participant)
入排标准
- 年龄范围
- 18 Years 至 40 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •written informed consent no disease history BNP level within the normal range Normal renal function (serum creatinine of more than 1.3 mg/dL and/or creatinin clearance greater than 80ml/min) Normal ECG
排除标准
- •systolic blood pressure < 90 mmHg subjects on any medication abnormal glucose metabolism history of anaphylaxis
研究组 & 干预措施
Placebo
comparison of the effect of b-type natriuretic peptide on glucose metabolism and placebo
干预措施: human BNP-32 (Drug)
B-type natriuretic peptide
the effect of B-type natriuretic peptide on glucose metabolism will be compared with placebo during an intravenous glocose tolerance test
干预措施: human BNP-32 (Drug)
结局指标
主要结局
glucose
时间窗: 0 to 180 minutes
次要结局
- insulin, c-peptide(0 to 180 minutes)