Effects of b3-Adrenergic Receptor Agonists on Brown Adipose Tissue
|Study Design:||Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Basic Science
|Official Title:||Effects of b3-Adrenergic Receptor Agonists on Brown Adipose Tissue|
- BAT Activity as Measured by 18F-FDG PET/CT [ Time Frame: 60 min after FDG administration ]difference in BAT metabolic activity measured in placebo and active drug arms. The BAT metabolic activity represents the amount of FDG tracer retained within the tissue. Retained FDG is a biomarker for tissue oxygen consumption and hence energy expenditure by the tissue.
- Whole-body Energy Expenditure [ Time Frame: 30 minutes before drug administration followed by 30 minutes after FDG administration ]This is the energy expenditure as calculated using indirect calorimetry.
|Study Start Date:||February 2013|
|Estimated Study Completion Date:||December 2018|
|Primary Completion Date:||December 2015 (Final data collection date for primary outcome measure)|
Experimental: beta3-adrenergic receptor agonist
single dose. Each subject was randomized to receive placebo at one visit and then the beta3-adrenergic receptor agonist on another study day.
Drug: beta3-adrenergic receptor agonist
single dose. The subjects were randomized to receive placebo on one study day and active beta3-adrenergic receptor agonist on the other study day.
Other Name: mirabegron, which is Myrbetriq (TM) by Astellas Pharma
This study will include an outpatient screening visit and three separate, independent overnight study visits in the General Clinical Research Center (GCRC) at Beth Israel Deaconess Medical Center (BIDMC). Screening procedures will consist of a medical history, physical examination, blood draw, and ECG. If, from the screening tests, it is determined that the eligibility criteria have been meet, healthy volunteers will participate in three separate inpatient visits at BIDMC. Study procedures will occur in the GCRC and the Nuclear Medicine suite at BIDMC.
Volunteers will first complete Day A, in which we will measure BAT volume and activity during cold exposure. Cold exposure will consist of wearing a cooling vest at 55 - 61°F, a temperature shown to be cool enough to activate brown adipose tissue but warm enough not to lead to shivering. Resting metabolic rate (RMR) will be measured by indirect calorimetry before and during cool exposure.
If there is detectable brown fat activity on Day A, volunteers will participate in Days B and C. Days B and C will be conducted in random order to reduce any bias from the sequence of treatment and scans, as well as any potential placebo effects. Day B will consist of pharmacological stimulation with β3-AR agonist. On Day C, volunteers will be given a placebo control and will not undergo cooling.
A blood draw of 26 cc will always be done prior to FDG injection and FDG PET/CT will always be performed 60 minutes after FDG injection. On Day A, FDG will be injected after 60 minutes of cool exposure and the volunteer will remain in the cooling vest for another 60 minutes after FDG injection.
To compare energy expenditure and BAT mass and activity among volunteers, we will normalize the data to fat and muscle mass. Whole-body and regional fat and muscle mass will be measured via a Dual Energy X-ray Absorptiometry (DXA) scan at the end of Day A.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01783470
|United States, Massachusetts|
|Beth Israel Deaconess Medical Center|
|Boston, Massachusetts, United States, 02215|
|Principal Investigator:||Aaron M Cypess, MD PhD||NIDDK, NIH|