Liraglutide Actions on the Liver: Effects on Glucose Phosphorylation

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.

Study Overview

• Status: Withdrawn
• Conditions: Type 2 Diabetes
• Intervention / Treatment: Drug: Liraglutide

Detailed Description

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:

1. to measure liraglutide's acute effect on GCK activity changes in vivo in type 2 diabetic patients;
2. 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

1. GCK activity (acute effect) during IVGTTs with and without liraglutide administration. GCK activity will be calculated based on lactate and glucose measurements during the IVGTT
2. GCK activity during IVGTTs before and after 6 weeks of liraglutide treatment (IVGTT3).

Secondary endpoints

1. SI-IVGTT (insulin sensitivity during an intravenous glucose tolerance test) as quantified by the MINMOD analysis of the IVGTT
2. Acute insulin response to glucose (AIRg) and the disposition index (DI-MINMOD), the ability of beta cell to compensate for changes in insulin sensitivity.

This is a study designed to investigate the effect of liraglutide in type 2 diabetes therefore subjects are selected from type 2 diabetes population of the Los Angeles basin area. The study population is represented by type 2 diabetics (age 18-65 y old, T2DM diagnosed by current American Diabetes Association diagnostic criteria ( HbA1c ≥ 6.5 % or fasting plasma glucose ≥ 126 mg/dl or 2h plasma glucose ≥ 200 mg/dL during an OGTT or in a patient with classic symptoms of hyperglycemia or hyperglycemic crisis a random plasma glucose ≥ 200 mg/dl).

• Study Type: Interventional
• Phase: Phase 4

Contacts and Locations

Study Locations

• United States
  • California
    • Los Angeles, California, United States, 90048
      • Cedars Sinai Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 65 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• 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).

Exclusion Criteria:

• 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

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Other: 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).	Drug: Liraglutide; 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).; Other Names: Victoza

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Liver glucokinase activity (acute effect)	We will measure liver glucokinase (GCK) activity 'in vivo' during IVGTTs with and without liraglutide administration	12 months
Liver glucokinase activity (chronic effect)	We will measure liver glucokinase (GCK) activity 'in vivo' during IVGTTs before and after 6 weeks of daily liraglutide administration	12 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
insulin sensitivity	We will measure SI-IVGTT (insulin sensitivity during an intravenous glucose tolerance test) as quantified by the MINMOD analysis of the IVGTT.	12 months
Acute insulin response to glucose and the disposition index	We will assess the acute insulin response to glucose (AIRg) and the disposition index (DI-MINMOD)(the ability of beta cell to compensate for changes in insulin sensitivity)	12 months

Collaborators and Investigators

• Sponsor: Cedars-Sinai Medical Center
• Investigators: Principal Investigator: Viorica Ionut, MD PhD, Cedars-Sinai Medical Center

Study record dates

Study Major Dates

• Study Start (Anticipated): December 1, 2019
• Primary Completion (Anticipated): July 1, 2020
• Study Completion (Anticipated): December 1, 2020

Study Registration Dates

• First Submitted: July 21, 2014
• First Submitted That Met QC Criteria: July 22, 2014
• First Posted (Estimate): July 23, 2014

Study Record Updates

• Last Update Posted (Actual): September 30, 2019
• Last Update Submitted That Met QC Criteria: September 26, 2019
• Last Verified: September 1, 2019

More Information

Terms related to this study

• Keywords: GLP-1; liraglutide; liver glucokinase
• Additional Relevant MeSH Terms: Hypoglycemic Agents; Physiological Effects of Drugs; Hormones; Hormones, Hormone Substitutes, and Hormone Antagonists; Incretins; Liraglutide
• Other Study ID Numbers: U1111-1138-7223

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No