Endothelins are endothelium-derived vasoconstrictor peptides (By similarity). Probable ligand for G-protein coupled receptors EDNRA and EDNRB which activates PTK2B, BCAR1, BCAR3 and, GTPases RAP1 and RHOA cascade in glomerular mesangial cells (By similarity). Also binds the DEAR/FBXW7-AS1 receptor (PubMed:16293765). Highest expression in the adult is in lung. Lower levels found in heart, kidney, brain and intestine. In the embryo, expressed in outer and inner pharyngeal arch surfaces. Also expressed in endothelium of dorsal aorta and arch arteries, and in epithelium of pharyngeal pouches. Expression in lung is low at 17.5 dpc fetal mice and increases progressively into adulthood. Belongs to the endothelin/sarafotoxin family.