Melanocortin receptor 4; Receptor specific to the heptapeptide core common to adrenocorticotropic hormone and alpha-, beta-, and gamma-MSH. Plays a central role in energy homeostasis and somatic growth. This receptor is mediated by G proteins that stimulate adenylate cyclase (cAMP).

Melanocyte-stimulating hormone receptor; Receptor for MSH (alpha, beta) and ACTH. Does not seem to be active with gamma-MSH. The activity of this receptor is mediated by G proteins which activate adenylate cyclase. Could be involved in spermatogenesis; Belongs to the G-protein coupled receptor 1 family.

Melanocortin-3-receptor.

Melanocortin receptor 5; Receptor for MSH (alpha, beta and gamma) and ACTH. The activity of this receptor is mediated by G proteins which activate adenylate cyclase. This receptor is a possible mediator of the immunomodulation properties of melanocortins (By similarity). Belongs to the G-protein coupled receptor 1 family.

Melanocortin 2 receptor accessory protein.

C-flanking peptide of NPY; NPY is implicated in the control of feeding and in secretion of gonadotrophin-release hormone.

Mu-type opioid receptor; Receptor for endogenous opioids such as beta-endorphin and endomorphin. Receptor for natural and synthetic opioids including morphine, heroin, DAMGO, fentanyl, etorphine, buprenorphin and methadone. Agonist binding to the receptor induces coupling to an inactive GDP-bound heterotrimeric G-protein complex and subsequent exchange of GDP for GTP in the G-protein alpha subunit leading to dissociation of the G-protein complex with the free GTP- bound G-protein alpha and the G-protein beta-gamma dimer activating downstream cellular effectors. The agonist- and cell ty [...]

Agouti-related protein; Plays a role in weight homeostasis. Involved in the control of feeding behavior through the central melanocortin system. Acts as alpha melanocyte-stimulating hormone antagonist by inhibiting cAMP production mediated by stimulation of melanocortin receptors within the hypothalamus and adrenal gland. Has very low activity with MC5R. Is an inverse agonist for MC3R and MC4R being able to suppress their constitutive activity. It promotes MC3R and MC4R endocytosis in an arrestin-dependent manner.

Met-enkephalin-Arg-Gly-Leu; Met- and Leu-enkephalins compete with and mimic the effects of opiate drugs. They play a role in a number of physiologic functions, including pain perception and responses to stress. PENK(111-130) and PENK(233-254) increase glutamate release in the striatum. PENK(111-130) decreases GABA concentration in the striatum; Belongs to the opioid neuropeptide precursor family.