Melanin-concentrating hormone

Melanin-concentrating hormone (MCH) is a cyclic amino acid peptide that plays a crucial role in the regulation of energy homeostasis, feeding behavior, and sleep-wake cycle. It is primarily produced in the lateral hypothalamus and zona incerta of the mammalian brain.

Function

MCH acts as a potent stimulator of food intake and decreases energy expenditure. It is involved in the regulation of body weight and metabolism. MCH also plays a role in the regulation of sleep and arousal. It promotes REM sleep and increases the total sleep time.

Structure

MCH is a 19-amino acid cyclic peptide. It is derived from a larger precursor protein, prepro-MCH, which also gives rise to neuropeptide EI and neuropeptide GE. The MCH peptide is highly conserved across species, indicating its important role in physiological processes.

Receptors

MCH acts through two known receptors, MCH1 and MCH2, which are G protein-coupled receptors. These receptors are widely distributed in the brain, with high concentrations in areas involved in the regulation of feeding and energy balance.

Role in Disease

Alterations in the MCH system have been implicated in a variety of diseases, including obesity, diabetes, sleep disorders, and depression. MCH receptor antagonists are being investigated as potential treatments for these conditions.

See Also

• Neuropeptide
• Hypothalamus
• G protein-coupled receptor