Cardiovascular Effects of GLP-1 Receptor Activation
Obesity, PreDiabetes
About this trial
This is an interventional basic science trial for Obesity
Eligibility Criteria
Inclusion Criteria:
- Men and women,
- Age 18 to 65 years, and
- FPG (100-125 mg/dL) or, IGT (two-hour plasma glucose 140-199 mg/dL) or, HbA1C 5.7-6.4%
- BMI≥30 kg/M2
- The ability to provide informed consent before any trial-related activities.
Exclusion Criteria:
- Diabetes type 1 or type 2, as defined by a FPG of 126 mg/dL or greater, a two-hour plasma glucose of 200 mg/dL or greater, or the use of anti-diabetic medication
- Resistant hypertension, defined as hypertension requiring the administration of more than three anti-hypertensive agents including a diuretic to achieve control
- Use of spironolactone
- Known or suspected allergy to trial medications, excipients, or related products.
- Family or personal history of multiple endocrine neoplasia type 2 (MEN2) or familial medullary thyroid carcinoma
- Personal history of non-familial medullary thyroid carcinoma
- History of pancreatitis
- Contraindications to study medications, worded specifically as stated in the product's prescribing information
- Pregnancy or breast-feeding. Women of child-bearing potential will be required to have undergone tubal ligation or to be using an oral contraceptive or barrier methods of birth control
- Subjects who have participated in a weight-reduction program during the last six month or whose weight has increased or decreased more than two kg over the preceding six months
- Cardiovascular disease such as myocardial infarction within six months prior to enrollment, presence of angina pectoris, significant arrhythmia, congestive heart failure (left ventricular hypertrophy acceptable), deep vein thrombosis, pulmonary embolism, second or third degree heart block, mitral valve stenosis, aortic stenosis or hypertrophic cardiomyopathy
- Treatment with anticoagulants
- 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 requiring regular inhaler use
- Clinically significant gastrointestinal impairment that could interfere with drug absorption
- Impaired hepatic function (aspartate amino transaminase [AST] and/or alanine amino transaminase [ALT] >3.0 x upper limit of normal range)
- Individuals with an eGFR<30 mL/min/1.73 m2 or with a UACR >1000µg/mg, where eGFR is determined by the four-variable Modification of Diet in Renal Disease (MDRD) equation, where serum creatinine is expressed in mg/dL and age in years: eGFR (mL/min/1.73m2)=186 • Scr-1.154 • age-0.203 • (1.212 if black) • (0.742 if female)
- 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 one month preceding the study
- Previous randomization in this trial
- Mental conditions rendering a 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 the study
Sites / Locations
- Vanderbilt University Medical Center
Arms of the Study
Arm 1
Arm 2
Arm 3
Experimental
Active Comparator
Active Comparator
liraglutide
sitagliptin
hypocaloric diet
Subjects in the liraglutide group will receive subcutaneous liraglutide (0.6 mg/d for one week, 1.2 mg/d for one week, and then 1.8 mg/d for 12 weeks) and oral placebo.
Subjects in the sitagliptin group will receive subcutaneous placebo daily and sitagliptin 100 mg/d orally for 14 weeks.
Subjects in the hypocaloric diet group will be given a caloric goal designed to achieve a weight loss similar to that expected in the liraglutide treatment arm based on his or her resting energy expenditure. Subjects will be provided counseling and written instructions on how to achieve their daily caloric goal, including use of their own mobile phone applications to monitor caloric intake. To assure compliance with the prescribed caloric goal, subjects will meet with the study dietitian every other week for problem solving and review of diet intake logs.