title: Intestinal type 2 proteinase-activated receptors: expression in opioid-sensitive secretomotor neural circuits that mediate epithelial ion transport.
abstract: Trypsin and mast cell tryptase cleave within the extracellular N terminus of proteinase-activated receptor-2 (PAR-2), exposing a tethered ligand (SLIGRL) that binds and activates the cleaved receptor. We examined the neuronal expression of PAR-2 and its role in intestinal ion transport. Short-circuit current elevations in response to trypsin or the receptor-activating peptide SLIGRL-NH(2) were measured in sheets of mucosa-submucosa from porcine ileum. SLIGRL-NH(2) or trypsin rapidly elevated short-circuit current after their contraluminal application with respective 50% effective concentrations of 184 and 769 nM. Their actions were attenuated after contraluminal administration of the neuronal conduction blocker saxitoxin (0.1 microM); the cyclooxygenase inhibitor indomethacin (10 microM); or the Na(+)/K(+)/Cl(-) cotransport inhibitor furosemide (10 microM), but not by atropine (0.1 microM), a muscarinic cholinergic antagonist. In addition, soybean trypsin inhibitor (5 microgram/ml) reduced mucosal responses to trypsin. The delta-opioid agonist [D-Pen(2,5)]-enkephalin (0.1 microM) inhibited trypsin action, an effect that was prevented by naltrindole (0.1 microM), a delta-opioid antagonist. PAR-2 immunofluorescence was localized in the mucosa using a receptor-specific antibody. PAR-2-like immunoreactivity was detected in myenteric and submucosal neurons, nerve fibers innervating ileal smooth muscle and mucosa, and in enteroendocrine cells. Some neurons coexpressed PAR-2- and choline acetyltransferase-like immunoreactivity. These results indicate that PAR-2 is expressed on cholinergic and noncholinergic submucosal neurons in porcine ileum. PAR-2 agonists stimulate active anion secretion by a neurogenic mechanism that is modulated by prostanoids and opioids. These receptors may have a potentially important role in intestinal neuroimmunomodulation.
authors.affiliation: Department of Veterinary PathoBiology, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota, USA.
authors.forename: B T
authors.initials: BT
authors.lastname: Green
authors.forename: N W
authors.initials: NW
authors.lastname: Bunnett
authors.forename: A
authors.initials: A
authors.lastname: Kulkarni-Narla
authors.forename: M
authors.initials: M
authors.lastname: Steinhoff
authors.forename: D R
authors.initials: DR
authors.lastname: Brown
mesh_terms: D000818:Animals; D029742:Caenorhabditis elegans Proteins; D005260:Female; D015801:Helminth Proteins / Q000032:analysis / Q000502:physiology*; D007082:Ileum / Q000294:innervation*; D007150:Immunohistochemistry; D007413:Intestinal Mucosa / Q000294:innervation / Q000378:metabolism*; D017136:Ion Transport; D008297:Male; D009294:Narcotics / Q000494:pharmacology*; D009474:Neurons / Q000737:chemistry*; D009842:Oligopeptides / Q000494:pharmacology; D013552:Swine; D014357:Trypsin / Q000494:pharmacology
chemical_list: D029742:Caenorhabditis elegans Proteins; D015801:Helminth Proteins; D009294:Narcotics; D009842:Oligopeptides; C087977:par-2 protein, C elegans; C112356:seryl-leucyl-isoleucyl-glycyl--arginyl-leucinamide; D014357:Trypsin