title: Nitric oxide in hyperbaric oxygen-induced acute antinociception in mice.
abstract: Hyperbaric oxygen (HBO2) therapy induces analgesia in various conditions of pain in humans. In mice, HBO2 treatment evokes an acute antinociceptive response in the abdominal constriction test. To demonstrate the dependence of HBO2-induced antinociception on nitric oxide (NO), antinociceptive responsiveness to HBO2 was assessed after three different approaches that interfered with NO production. HBO2-induced antinociception was significantly attenuated by intracerebroventricular and intrathecal pretreatment with an inhibitor of NO synthase (NOS) enzyme and also by an antisense oligodeoxynucleotide directed against neuronal NOS. The antinociceptive effect was also significantly reduced in mice homozygous for a defective neuronal NOS gene. On the basis of these results, we conclude that neuronal NO is critical in the expression of the acute antinociceptive effect of HBO2.
authors.affiliation: Department of Pharmaceutical Sciences, Washington State University, Pullman, 99164, USA.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Ohgami
authors.forename: Carlyn C
authors.initials: CC
authors.lastname: Zylstra
authors.forename: Lindsay P
authors.initials: LP
authors.lastname: Quock
authors.forename: Eunhee
authors.initials: E
authors.lastname: Chung
authors.forename: Donald Y
authors.initials: DY
authors.lastname: Shirachi
authors.forename: Raymond M
authors.initials: RM
authors.lastname: Quock
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D004791:Enzyme Inhibitors / Q000494:pharmacology; D015971:Gene Expression Regulation, Enzymologic / Q000235:genetics; D006931:Hyperbaric Oxygenation; D007276:Injections, Intraventricular; D007278:Injections, Spinal; D008297:Male; D051379:Mice; D008817:Mice, Mutant Strains; D009154:Mutation / Q000235:genetics; D009569:Nitric Oxide / Q000096:biosynthesis / Q000502:physiology*; D052248:Nitric Oxide Synthase Type I / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D009619:Nociceptors / Q000378:metabolism*; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D010100:Oxygen / Q000008:administration & dosage / Q000627:therapeutic use; D010146:Pain / Q000378:metabolism / Q000517:prevention & control*; D059408:Pain Management
chemical_list: D004791:Enzyme Inhibitors; D016376:Oligonucleotides, Antisense; D009569:Nitric Oxide; D052248:Nitric Oxide Synthase Type I; C496321:Nos1 protein, mouse; D010100:Oxygen