Brown adipose tissue

Histological image of brown adipose tissue showing multilocular fat cells.

Brown adipose tissue (BAT), also known as brown fat, is a type of adipose tissue that is primarily involved in thermogenesis, the process of heat production in organisms. Unlike white adipose tissue, which stores energy in the form of fat, brown adipose tissue is specialized for energy expenditure.

Structure

Brown adipose tissue is characterized by its high density of mitochondria, which contain iron-rich cytochromes that give the tissue its brown color. The cells in brown adipose tissue, known as adipocytes, are multilocular, meaning they contain multiple small lipid droplets, as opposed to the unilocular adipocytes found in white adipose tissue.

Function

The primary function of brown adipose tissue is to generate heat through a process known as non-shivering thermogenesis. This is achieved by the action of uncoupling protein 1 (UCP1), which is present in the inner mitochondrial membrane. UCP1 uncouples the process of oxidative phosphorylation, allowing the energy from fatty acid oxidation to be released as heat instead of being stored as adenosine triphosphate (ATP).

Location

In humans, brown adipose tissue is primarily found in the supraclavicular and paravertebral regions, as well as around the kidneys and adrenal glands. In infants, brown adipose tissue is more abundant and plays a crucial role in maintaining body temperature.

Clinical Significance

Brown adipose tissue has gained significant interest in the field of obesity and metabolic syndrome research. The ability of brown fat to burn calories and generate heat makes it a potential target for therapeutic strategies aimed at weight loss and improving insulin sensitivity.

Related pages

• Adipose tissue
• Thermogenesis
• Mitochondria
• Obesity

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