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Research ArticleNEUROPHARMACOLOGY

Role of Nitric-Oxide Synthase Isoforms in Nitrous Oxide Antinociception in Mice

Masago Ishikawa and Raymond M. Quock
Journal of Pharmacology and Experimental Therapeutics August 2003, 306 (2) 484-489; DOI: https://doi.org/10.1124/jpet.103.049551
Masago Ishikawa
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Raymond M. Quock
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Abstract

Exposure of mice to the anesthetic gas N2O evokes a prominent antinociceptive effect that is sensitive to antagonism by nonselective nitric-oxide synthase (NOS) inhibitors. The present study was conducted to identify whether a specific NOS isoform is implicated in N2O antinociception in mice. In the abdominal constriction test, exposure of mice to 25, 50, and 70% N2O resulted in a concentration-dependent antinociceptive effect that persisted for up to 6 min following removal of the mice from the N2O atmosphere into room air. This N2O antinociceptive effect was antagonized by pretreatment with S-methyl-l-thiocitrulline (SMTC) and higher doses of l-N5-(1-iminoethyl)-ornithine (l-NIO), which reportedly inhibit the neuronal and endothelial isoforms of NOS, respectively. Nevertheless, the N2O-induced antinociception was unaffected by pretreatment with low doses of either SMTC or l-NIO or by pretreatment with 2-amino-5,6-dihydro-6-methyl-4H-1,3-thiazine (AMT), which selectively inhibits inducible NOS. The s.c. pretreatment with SMTC and l-NIO reduced brain NOS activity in a dose-dependent manner, whereas AMT had no such effect. Moreover, in blood pressure experiments, SMTC increased SBP in dose-unrelated fashion, whereas l-NIO showed an appreciably weaker but dose-related increase in SBP. The i.c.v. pretreatment with SMTC also reduced N2O antinociception and brain NOS activity without increasing of SBP. These results suggest that it is the neuronal isoform of NOS that is involved in mediation of the antinociceptive effect of N2O in the mice.

Footnotes

  • This research was supported by National Institutes of Health Grant DA-10047.

  • DOI: 10.1124/jpet.103.049551.

  • ABBREVIATIONS: NO, nitric oxide; NOS, nitric-oxide synthase; nNOS, neuronal nitric oxide synthase; eNOS, endothelial nitric oxide synthase; iNOS, inducible nitric oxide synthase; SMTC, S-methyl-l-thiocitrulline; l-NIO, l-N5-(1-iminoethyl)ornithine; AMT, 2-amino-5,6-dihydro-6-methyl-4H-1,3-thiazine; SBP, systolic blood pressure; l-NAME, l-Nω-nitro arginine methyl ester; l-NOARG, l-Nω-nitro arginine; U.S.P., United States Pharmacopeia.

    • Received February 11, 2003.
    • Accepted April 18, 2003.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 306 (2)
Journal of Pharmacology and Experimental Therapeutics
Vol. 306, Issue 2
1 Aug 2003
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Research ArticleNEUROPHARMACOLOGY

Role of Nitric-Oxide Synthase Isoforms in Nitrous Oxide Antinociception in Mice

Masago Ishikawa and Raymond M. Quock
Journal of Pharmacology and Experimental Therapeutics August 1, 2003, 306 (2) 484-489; DOI: https://doi.org/10.1124/jpet.103.049551

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Research ArticleNEUROPHARMACOLOGY

Role of Nitric-Oxide Synthase Isoforms in Nitrous Oxide Antinociception in Mice

Masago Ishikawa and Raymond M. Quock
Journal of Pharmacology and Experimental Therapeutics August 1, 2003, 306 (2) 484-489; DOI: https://doi.org/10.1124/jpet.103.049551
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