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This study investigates cold-induced brown fat activation assessed using PET/MR scans. Subjects will participate in an acute cooling intervention day and a thermoneutral intervention day with PET/MR scans on both days. A secondary purpose is to make a validation of an infrared thermography camera by comparison of skin temperatures and SUV of the supraclavicular brown adipose tissue.
The field of human brown adipose tissue (BAT) research is focused on activation of BAT as a means of manipulating energy expenditure and potentially anti-obesity and anti-diabetic properties of the tissue. This is well established in rodent studies and explained as due to the specific brown fat uncoupling protein 1 (UCP1). Despite increasing evidence that indicates a metabolic regulatory role of BAT in humans, BAT activation/recruitment is not fully understood and even less is known about the endocrine capacities of human BAT.
Cold induced brown fat activity will be assessed with PET/MR scans and validate an infra-red thermography camera, as well as perform a proteomic screening using blood samples under these two intervention days.
15 healthy lean male subjects will serve as their own control in a cross-over randomized control study, including a pre-examination day, a thermoneutral-day and a cooling test-day with cold exposure followed by a PET/MR scan to determine BAT activity. An extra cooling day is applied for the external validation of the infrared thermography camera. Blood samples and abdominal fat-biopsies will be taken at thermoneutral condition and under cold stimulation of brown fat.
Adipose Tissue, Brown
Center for Inflammation and Metabolism/ Center for Physical Activity Research
Not yet recruiting
Published on BioPortfolio: 2017-03-30T23:38:21-0400
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A thermogenic form of adipose tissue composed of BROWN ADIPOCYTES. It is found in newborns of many species including humans, and in hibernating mammals. Brown fat is richly vascularized, innervated, and densely packed with MITOCHONDRIA which can generate heat directly from the stored lipids.
Brown fat-like adipose tissue that develops in WHITE ADIPOSE TISSUE from non-MYOGENIC REGULATORY FACTOR 5 expressing cell lineage.
Specialized connective tissue composed of fat cells (ADIPOCYTES). It is the site of stored FATS, usually in the form of TRIGLYCERIDES. In mammals, there are two types of adipose tissue, the WHITE FAT and the BROWN FAT. Their relative distributions vary in different species with most adipose tissue being white.
A lipid droplet protein that is expressed primarily by ADIPOCYTES of WHITE ADIPOSE TISSUE and BROWN ADIPOSE TISSUE. It co-localizes with MACROPHAGES and FOAM CELLS of artherosclerotic lesions and stabilizes LIPID DROPLETS by inhibiting HORMONE SENSITIVE LIPASE. It may also protect TRIGLYCERIDES against hydrolysis within the PLASMA MEMBRANE and modulate CHOLESTEROL ESTER HYDROLASE activity.
Neoplasms composed of fatty tissue or connective tissue made up of fat cells in a meshwork of areolar tissue. The concept does not refer to neoplasms located in adipose tissue.
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