NatCom: the protein MRAP2 plays a key role in appetite control.
An international team of researchers has shown that the protein MRAP2 plays a key role in the functioning of the MC4R receptor — one of the main "switches" in the brain responsible for controlling appetite and metabolism. This receptor responds to the hormone α-MSH and signals that it is time to stop eating. The work is published in Nature Communications (NatCom).
The scientists found that MRAP2 enhances the activity of MC4R: it helps the receptor remain active longer and transmit signals of satiety more effectively. Additionally, MRAP2 influences how receptors are organized within the cell — instead of large and less mobile complexes, more individual active molecules are formed, making the system more sensitive.
Thus, MRAP2 effectively "tunes" the appetite control system in the brain, helping it respond more accurately to the body's signals. This is particularly important as disruptions in the functioning of MC4R are considered one of the most common genetic causes of severe obesity.
The authors note that the discovered mechanism could serve as a basis for new methods to combat obesity: for example, drugs could be developed that mimic the action of MRAP2 and enhance natural satiety signals.
