The oxytocin receptor (OXTR) belongs to the G-protein coupled receptor family. Its activity is mediated by G proteins which activate a phosphatidylinositol-calcium second messenger system. The receptor is made up of 389 amino acids and has a molecular weight of ~43,000 kDa. The oxytocin-oxytocin receptor system plays an important role as an inducer of uterine contractions during parturition and of milk ejection. Oxytocin receptors are expressed by the myoepithelial cells of the mammary gland, and in both the myometrium and endometrium or the uterus at the end of pregnancy. Additionally, oxytocin receptors are present in the central nervous system, mediating a variety of behaviors, including maternal behavior, bonding, social memory and recognition, sexual and aggressive behaviors, and stress and anxiety.
OT-R; oxcytocin receptor; OXTR; Oxytocin receptor