title: Characterization of the endogenous intestinal peptide that stimulates the rectal gland of Scyliorhinus canicula.
abstract: It has been postulated that gut peptides play a major role in the regulation of rectal gland secretion in elasmobranchs. An isolated perfused rectal gland secretion in elasmobranchs. An isolated perfused rectal gland preparation was developed for Scyliorhinus canicula that responded to dibutyryl 3',5'-cyclic monophosphate plus 3-isobutyl-1-methylxanthine, increasing chloride clearance rates threefold over basal levels. Activity was stimulated by an endogenous peptide, isolated in pur form by reverse-phase high-performance liquid chromatography from the intestine of S. canicula. The primary structure was established as Ser-Pro-Ser-Asn-Ser-Lys-Cys-Pro-Asp-Gly-Pro-Asp-Cys-Phe-Val-Gly-Leu-Met- NH2. This is a sequence identical to that of the tachykinin scyliorhinin II. Perfusion of synthetic scyliorhinin II increased secretion rate in the rectal gland of S. canicula in a dose-dependent manner with a maximal response at 10(-6) M, whereas vasoactive intestinal peptide, a stimulator in the spiny dogfish, Squalus acanthias, had no effect. We propose that scyliorhinin II is the uncharacterized peptide rectin, previously identified from the intestine of S. canicula.
authors.affiliation: Department of Biology and Preclinical Medicine, Gatty Marine Laboratory, University of St. Andrews, Fife, United Kingdom.
authors.forename: W G
authors.initials: WG
authors.lastname: Anderson
authors.forename: J M
authors.initials: JM
authors.lastname: Conlon
authors.forename: N
authors.initials: N
authors.lastname: Hazon
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D000595:Amino Acid Sequence; D000818:Animals; D003994:Bucladesine / Q000494:pharmacology; D002712:Chlorides / Q000378:metabolism; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D004284:Dogfish; D004305:Dose-Response Relationship, Drug; D005260:Female; D005768:Gastrointestinal Hormones / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D006706:Homeostasis; D066298:In Vitro Techniques; D007422:Intestines / Q000502:physiology*; D008297:Male; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D010477:Perfusion; D012491:Salt Gland / Q000187:drug effects / Q000502:physiology*; D014660:Vasoactive Intestinal Peptide / Q000494:pharmacology
chemical_list: D002712:Chlorides; D005768:Gastrointestinal Hormones; D010455:Peptides; D014660:Vasoactive Intestinal Peptide; D003994:Bucladesine; D015056:1-Methyl-3-isobutylxanthine