Renin- Angiotensin and Fibrinolysis Interaction in Humans: Effect of Long-term PDE-5 Inhibition on Glucose Homeostasis. Sub-study
试验速览
- 阶段
- 4 期
- 状态
- 已完成
- 入组人数
- 15
- 试验地点
- 1
- 主要终点
- Insulin-stimulated AKT Phosphorylation
研究概览
简要总结
Our research proposal will determine if PDE-5 inhibition exerts a favorable effect on insulin signaling pathways in skeletal muscle of subjects with impaired fasting glucose and/or impaired glucose tolerance.
详细描述
Participants enrolled in the study titled " Renin-angiotensin and fibrinolysis interaction in humans: effect of long-term PDE5 inhibition on glucose Homeostasis, (Specific aim 2)" will be offered the opportunity to participate in this sub-study.
We will obtain skeletal muscle biopsies from 16 subjects who are enrolled in specific aim 2. Eight subjects will be in the sildenafil group and 8 subjects will be in the placebo group.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Basic Science
- 盲法
- Double (Participant, Investigator)
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Age > 18 years and BMI > 25 kg/M2 (> 23 kg/M2 among Asian Americans) and ≤40kg/m2 Impaired fasting glucose (100-125mg/dL) and/or impaired glucose tolerance (2-hr plasma glucose 140-199 mg/dL) and/or hemoglobin A1c 5.7-6.4%
排除标准
- •Diabetes type 1 or type 2, as defined by a fasting glucose of 126 mg/dL or greater, a two-hour plasma glucose of 200 mg/dL or greater, or the use of anti-diabetic medication.
- •The use of nitrates or any disease that might require the use of nitrates.
- •The use of any potent CYP3A4 inhibitor.
- •Subjects who have participated in a weight-reduction program during the last 6 month or whose weight has increased or decreased more than 2 kg over the preceding 6 months.
- •Pregnancy. Women of child-bearing potential will be required to have undergone tubal ligation or to be using barrier or hormonal methods of birth control.
- •Breast-feeding.
- •Cardiovascular disease such as myocardial infarction within 6 months prior to enrollment, presence of angina pectoris, significant arrhythmia, congestive heart failure, deep vein thrombosis, pulmonary embolism, second or third degree heart block, mitral valve stenosis, aortic stenosis or hypertrophic cardiomyopathy.
- •Treatment with anticoagulants.
- •Treatment with metformin.
- •History of serious neurologic disease such as cerebral hemorrhage, stroke, or transient ischemic attack.
- •History or presence of immunological or hematological disorders.
- •Diagnosis of asthma on current inhaled corticosteroid therapy.
- •Clinically significant gastrointestinal impairment that could interfere with drug absorption.
- •Impaired hepatic function (aspartate amino transaminase and/or alanine amino transaminase >1.5 x upper limit of normal range)
- •Impaired renal function (serum creatinine >1.5 mg/dl).
- •Hematocrit <35%.
- •Any underlying or acute disease requiring regular medication which could possibly pose a threat to the subject or make implementation of the protocol or interpretation of the study results difficult.
- •Treatment with chronic systemic glucocorticoid therapy (more than 7 consecutive days in 1 month).
- •Treatment with lithium salts.
- •History of alcohol or drug abuse.
- •Treatment with any investigational drug in the 1 month preceding the study.
- •Mental conditions rendering the subject unable to understand the nature, scope and possible consequences of the study.
- •Inability to comply with the protocol, e.g. uncooperative attitude, inability to return for follow-up visits, and unlikelihood of completing.
研究组 & 干预措施
sildenafil citrate
In the parent study, subjects are randomized to sildenafil 25 mg tid.
干预措施: Sildenafil citrate (Drug)
placebo oral capsule
In the parent study, subjects are randomized to matching placebo
干预措施: Placebo Oral Capsule (Drug)
结局指标
主要结局
Insulin-stimulated AKT Phosphorylation
时间窗: 3 months
measured using Western blot for pAkt and for total Akt from muscle biopsies obtained at the end of the baseline hyperinsulinemic clamp and the three-month hyperglycemic clamp. The ratio of pAkt to Akt expression was calculated at each time point and the change in ratio from 0 to 3 months is presented.
次要结局
未报告次要终点
研究者
Nancy J. Brown
Professor Medicine and Pharmacology
Vanderbilt University Medical Center