Abdominal Obesity, Cardiovascular Inflammation, and Effects of Growth Hormone Releasing Hormone Analogue
Obesity is strongly associated with risk of cardiovascular disease (CVD). Data increasingly suggest that visceral adipose tissue (VAT) accumulation -- or increased abdominal fat -- is particularly deleterious to cardiovascular health, but further study is needed to test this idea. Increased abdominal fat may also be associated with lower secretion of a hormone called growth hormone (GH), which helps the body burn fat. The current study aims to carefully characterize relationships between abdominal fat and CVD. In addition, by using a medication called growth hormone releasing hormone, which is a strategy to reduce abdominal fat, the investigators will test the hypothesis that abdominal fat contributes uniquely to increased arterial inflammation.
In the first part of this study, the investigators will investigate both lean (healthy weight) individuals and individuals with increased abdominal fat. The investigators will study their body composition, cardiovascular risk measures, insulin sensitivity, and growth hormone dynamics, with the hypothesis that abdominal fat, independent of general obesity, will be strongly associated with arterial wall thickening and atherosclerotic inflammation. The investigators will assess arterial wall thickness, plaque morphology, and atherosclerotic inflammation, and the investigators will determine associations between these variables and regional fat accumulation, with particular attention to abdominal fat.
The second, treatment part of the study will be only for individuals with increased abdominal fat who are found to have low growth hormone secretion. In that part of the study, the investigators will test the effects of a growth hormone releasing hormone (GHRH) analogue to reduce abdominal fat and, consequently, reduce arterial inflammation. The investigators hypothesize that abdominal fat reduction, independent of changes in growth hormone, will reduce arterial inflammation and arterial wall thickness.
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator)
Primary Purpose: Treatment
|Official Title:||Abdominal Obesity, Cardiovascular Inflammation, and Effects of a Growth Hormone Releasing Hormone Analogue to Reduce Inflammation|
- aortic "target to background ratio" (Aortic TBR) [ Time Frame: 12 months ] [ Designated as safety issue: No ]aortic target-to-background ratio is a measure of the inflammation in the wall of the aorta that is made by positron emission tomography (PET) scanning in conjunction with computed tomography (CT) scanning.
|Study Start Date:||January 2014|
|Study Completion Date:||January 2014|
|Primary Completion Date:||January 2014 (Final data collection date for primary outcome measure)|
Experimental: Growth Hormone Releasing Hormone
Growth Hormone Releasing Hormone analogue, 2mg subcutaneously every day for 12 months.
The Growth Hormone Releasing Hormone analogue tesamorelin, 2mg subcutaneously daily by injection
|Placebo Comparator: Placebo||
placebo given by injection 2mg subcutaneously daily
|United States, Massachusetts|
|Massachusetts General Hospital|
|Boston, Massachusetts, United States, 02115|
|Principal Investigator:||Steven Grinspoon, MD||Massachusetts General Hospital|