title: The histamine H receptor as a new target for treatment of canine inflammatory skin diseases.
abstract: Histamine is a well known mediator of allergic skin diseases and, with the discovery of the histamine H(4) receptor, the role of histamine is re-evaluated. There are only limited published data elucidating the role of the histamine H(4) receptor in dogs. Twelve beagles intradermally injected with histamine (0.25 micromol and 2.5 micromol/site) reacted with a classical wheal and flare reaction. None of the dogs showed signs of pruritus. The dogs reacted with a wheal and flare reaction after intradermal injection of histamine H(4) receptor agonist/H(3) receptor antagonist clobenpropit (0.1 micromol) and selective histamine H(4) receptor agonist VUF 8430 (1.5 micromol). Again, no scratching occurred in any of the dogs. The highly selective histamine H(4) receptor antagonist JNJ 7777120 reduced the histamine-induced wheal reaction in nine out of 12 dogs. To determine whether canine mast cells are susceptible to histamine H(4) receptor-mediated reactions, effects of clobenpropit and VUF 8430 were tested in canine mastocytoma cells (C2). Incubation with histamine H(4) receptor agonists (up to 10 micromol/L) induced a distinct calcium(2+) influx. C2 cells also responded with enhanced chemotaxis when stimulated with histamine, VUF 8430 and clobenpropit. Neither VUF 8430, nor clobenpropit (up to 10 micromol/L) led to a modulation of histamine concentration in supernatants of canine mastocytoma cells, whereas mastoparan, used as a positive control, enhanced histamine concentration in supernatants. For treatment of allergic skin diseases in dogs, a combination of H(1)R and H(4)R antagonists might be advantageous.
authors.affiliation: Department of Pharmacology, Toxicology and Pharmacy, University of Veterinary Medicine, 30559 Hannover, Germany.
authors.forename: Kristine
authors.initials: K
authors.lastname: Rossbach
authors.forename: Holger
authors.initials: H
authors.lastname: Stark
authors.forename: Kerstin
authors.initials: K
authors.lastname: Sander
authors.forename: Rob
authors.initials: R
authors.lastname: Leurs
authors.forename: Manfred
authors.initials: M
authors.lastname: Kietzmann
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Bäumer
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D002460:Cell Line; D004283:Dog Diseases / Q000188:drug therapy*; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D005260:Female; D006146:Guanidines / Q000494:pharmacology; D006632:Histamine / Q000494:pharmacology; D017442:Histamine Agonists / Q000494:pharmacology; D006633:Histamine Antagonists / Q000494:pharmacology; D007093:Imidazoles / Q000494:pharmacology; D007211:Indoles / Q000494:pharmacology*; D007249:Inflammation / Q000139:chemically induced / Q000188:drug therapy / Q000503:physiopathology / Q000662:veterinary; D036341:Intercellular Signaling Peptides and Proteins; D008297:Male; D034801:Mastocytoma; D051379:Mice; D008807:Mice, Inbred BALB C; D010455:Peptides / Q000494:pharmacology; D010879:Piperazines / Q000494:pharmacology*; D043562:Receptors, G-Protein-Coupled / Q000145:classification*; D011968:Receptors, Histamine / Q000145:classification*; D012871:Skin Diseases / Q000188:drug therapy / Q000503:physiopathology / Q000662:veterinary*; D013890:Thiourea / Q000031:analogs & derivatives / Q000494:pharmacology; D014862:Wasp Venoms / Q000494:pharmacology
chemical_list: D006146:Guanidines; D017442:Histamine Agonists; D006633:Histamine Antagonists; D007093:Imidazoles; D007211:Indoles; D036341:Intercellular Signaling Peptides and Proteins; D010455:Peptides; D010879:Piperazines; D043562:Receptors, G-Protein-Coupled; D011968:Receptors, Histamine; C516215:S-(2-guanidylethyl)isothiourea; D014862:Wasp Venoms; C484309:1-((5-chloro-1H-indol-2-yl)carbonyl)-4-methylpiperazine; C037500:mastoparan; D006632:Histamine; D013890:Thiourea; C086108:clobenpropit; D002118:Calcium