Liraglutide Actions on the Liver: Effects on Glucose Phosphorylation
试验速览
- 阶段
- 4 期
- 状态
- 撤回
- 试验地点
- 1
- 主要终点
- Liver glucokinase activity (chronic effect)
研究概览
简要总结
Type 2 diabetes is a chronic disease that has reached epidemic proportions. In order to improve our strategies for preventing and treating type 2 diabetes the investigators need to better understand the mechanism of this disease, and the way in which current therapies, such as the drug liraglutide, work to control blood sugar. It is known that liraglutide acts via increasing the secretion of the hormone insulin from the pancreas, hormone that in turn controls blood sugar. However, it is not known whether liraglutide also has actions on the liver. Animal studies have suggested that liraglutide might act by controlling the liver enzyme glucokinase (GCK), an enzyme that increases blood sugar uptake by the liver. This could be a crucial mechanism in which liraglutide controls blood sugar independently of insulin, thus making it beneficial not only in type 2 but also in type 1 diabetes. The effect of liraglutide on GCK activity has not been yet measured in humans. The investigators propose to investigate the acute and chronic effect of liraglutide on GCK by using a simple, widely used procedure (an IntraVenous Glucose Tolerance Test-IVGTT) and a novel approach (mathematical modeling of data obtained from this procedure), to assess GCK activity in people with type 2 diabetes. The investigators will first compare data obtained form 2 IVGTTs (with and without liraglutide) performed 1 week apart (acute effect). The investigators will then give liraglutide to patients for 6 weeks and do another IVGTT to measure GCK activity (chronic effects). Data obtained from this study will be used to further understand the mechanism of liraglutide action and how to better employ our current therapeutic options and develop new strategies for preventing and treating diabetes.
详细描述
It is known that liraglutide impacts favorably glucose homeostasis in type 2 diabetic patients, but not the exact mechanism of this effect. In particular, liraglutide's acute and chronic effects on the liver are not well understood. The aim of our study is to determine whether liraglutide acutely and/or chronically changes hepatic GCK activity in vivo in type 2 diabetic patients, and to quantify this effect. We hypothesize that liraglutide increases GCK activity and that this results in increased hepatic glucose uptake, contributing to a lowering of glycemia.
Our specific aims are:
- to measure liraglutide's acute effect on GCK activity changes in vivo in type 2 diabetic patients;
- to assess whether chronic treatment with liraglutide determines a change in liver GCK activity in type 2 diabetic patients, as assessed during an IVGTT.
We expect that liraglutide acutely and/or chronically increases GCK activity, thus contributing to higher liver glucose uptake and lower glycemia.
Primary endpoints
研究设计
- 研究类型
- Interventional
- 分配方式
- Na
- 干预模型
- Single Group
- 主要目的
- Basic Science
- 盲法
- None
入排标准
- 年龄范围
- 18 Years 至 65 Years（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •18- 65 years of age (inclusive)
- •Ability to provide informed consent before any trial-related activities
- •Ability to communicate effectively with research staff
- •Ability to return for follow up visit
- •Adequate IV access
- •If a female of childbearing potential, non-pregnant and taking reliable contraception
- •Documented T2DM (per most recent American Diabetes Association criteria);
- •Drug naïve or treated with metformin only;
- •Diabetes should be well controlled (as defined by HbA1 ≤ 7.5%, FPG <180 mg/dl).
排除标准
- •Pregnant, breast-feeding or the intention of becoming pregnant or not using adequate contraceptive measures
- •Presence of cancer or any clinically significant cardiac, respiratory, renal, hepatic, gastrointestinal, endocrinological, haematological, neurological, or psychiatric diseases or disorders (inclusion will be discussed with attending physician)
- •Liver disease; history of alcoholism.
- •Known or suspected allergy to liraglutide
- •Contraindications to liraglutide: patients with a personal or family history of medullary thyroid carcinoma or in patients with Multiple Endocrine Neoplasia syndrome type 2
- •Patients with a history of pancreatitits
- •Patients that have been treated with drugs that promote weight loss (e.g., Xenical® [orlistat], Meridia® [sibutramine], Acomplia® [rimonabant], Acutrim® [phenylpropanolamine], or similar over-the-counter medications) within 3 months of study start
- •Patients that have been treated with diabetes drugs: injectables, (e.g GLP-1R agonists (Byetta® [exenatide], Victoza® [liraglutide]) amylin analogues; insulin and insulin analogues) or oral agents other than metformin (e.g.DPP-IV- inhibitors (Januvia® [sitagliptin], Onglyza® [saxagliptin] or Janumet® [sitagliptin and metformin]),insulin sensitizers (thiazolidindiones: pioglitazone [Actos®]); or sulfonylureas) within 3 months of study start.
- •The receipt of any investigational drug within 3 months prior to study start.
- •Type 1 diabetes
研究组 & 干预措施
single arm
Liraglutide (Victoza)
- acute study: one injection of 0.6 mg s.c. before IVGTT
- chronic study: 6 weeks of daily liraglutide administration (1 week at 0.6 mg, 1 week at 1.2 mg, 4 weeks at 1.8 mg, s.c).
干预措施: Liraglutide (Drug)
结局指标
主要结局
Liver glucokinase activity (chronic effect)
时间窗: 12 months
We will measure liver glucokinase (GCK) activity 'in vivo' during IVGTTs before and after 6 weeks of daily liraglutide administration
Liver glucokinase activity (acute effect)
时间窗: 12 months
We will measure liver glucokinase (GCK) activity 'in vivo' during IVGTTs with and without liraglutide administration
次要结局
- insulin sensitivity(12 months)
- Acute insulin response to glucose and the disposition index(12 months)
研究者
Marilyn Ader, PhD
Associate Director, Diabetes & Obesity Research Institute
Cedars-Sinai Medical Center