Melanocortins (Reproductive-Axis & Endocrine Signaling)

Melanocortin peptides are a family of signaling peptides derived from the precursor protein proopiomelanocortin (POMC). The family includes α-MSH, β-MSH, γ-MSH, and ACTH, along with a number of synthetic analogs developed for research purposes, such as Melanotan I, Melanotan II, PT-141, and others.

Melanocortins are studied in connection with pigmentation pathways, appetite and energy balance research, and sexual-function signaling, depending on which receptor subtype is engaged. All melanocortin-class compounds offered by Peptide Scientific Labs are lyophilized research materials intended solely for in vitro laboratory investigation.

The melanocortin receptor system is a family of five G protein-coupled receptors designated MC1R through MC5R. Each subtype has a different tissue distribution and research-studied function: MC1R is associated with melanocyte biology and pigmentation, MC2R with adrenal cortex signaling, MC3R and MC4R with central nervous system pathways related to energy balance, and MC5R with exocrine tissues.

Research on melanocortin peptides is largely organized around which receptor subtypes a given peptide preferentially engages. This receptor selectivity is a key variable in how these compounds are studied in the laboratory.

α-MSH (alpha-melanocyte-stimulating hormone) is a 13-amino-acid peptide derived from POMC and is one of the best-studied members of the melanocortin family. It is investigated primarily in the context of MC1R signaling and pigmentation research, but it also interacts with other melanocortin receptors at varying affinities.

Synthetic analogs such as Melanotan I and Melanotan II were developed to study more stable or receptor-selective variants of the natural α-MSH sequence. These analogs retain the core structural features of α-MSH while differing in their stability and receptor preference, which makes them useful reference compounds in melanocortin-system research.