title: Localization of endothelin-1 and its binding sites to the nervous system of the human colon.
abstract: Endothelin-1 (ET-1) has been reported to possess a wide variety of biological activities, including neurotransmission. Our aim was to demonstrate ET-like immunoreactivity (ET-LI) and its binding sites in human enteric nervous system using immunohistochemistry and in vitro autoradiography. ET-LI was displayed in nerve bundles and most of the ganglion cells in both myenteric and submucous plexuses, many of which costored VIP. [125I]ET-1 binding sites were identified, especially to plexuses, mucosa, and blood vessels. High-affinity (Kd = 0.35 +/- 0.014 nM; mean +/- SEM) binding sites, with a maximum binding capacity (Bmax) of 92 +/- 6.3 amol/mm2, were demonstrated in the myenteric plexus. This study provides evidence that ET-1 is a neuropeptide in the human colon with binding sites on neural plexuses and mucosa, indicating a possible role in the modulation of motility and secretion in the human intestine.
authors.affiliation: Histochemistry Department, Royal Postgraduate Medical School, Hammersmith Hospital, London, England.
authors.forename: H
authors.initials: H
authors.lastname: Inagaki
authors.forename: A E
authors.initials: AE
authors.lastname: Bishop
authors.forename: J
authors.initials: J
authors.lastname: Yura
authors.forename: J M
authors.initials: JM
authors.lastname: Polak
mesh_terms: D001345:Autoradiography; D001665:Binding Sites; D003106:Colon / Q000294:innervation* / Q000378:metabolism; D016232:Endothelins / Q000378:metabolism*; D005724:Ganglia / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D066298:In Vitro Techniques; D007457:Iodine Radioisotopes; D007700:Kinetics; D009474:Neurons / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000378:metabolism; D017466:Receptors, Endothelin; D014018:Tissue Distribution
chemical_list: D016232:Endothelins; D007457:Iodine Radioisotopes; D011956:Receptors, Cell Surface; D017466:Receptors, Endothelin