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ANESTHETIC PHARMACOLOGY

The Effects of Lidocaine on Nitric Oxide Production from an Activated Murine Macrophage Cell Line

Departments of Anesthesiology and Intensive Care Unit, Kobe University School of Medicine, Kobe, Japan

Address correspondence and reprint requests to Katsuya Mikawa, MD, Departments of Anesthesiology and Intensive Care Unit, Kobe University School of Medicine, Kusunoki-cho 7, Chuo-ku, Kobe 650-0017, Japan.

Nitric oxide (NO), overproduced by activated macrophages, is important in the pathogenesis of various diseases, including septic shock and inflammatory tissue injury, as well as antibacterial host defense mechanisms. We examined the effects of lidocaine on NO production and the expression of inducible NO synthase (iNOS) protein and messenger RNA (mRNA) in activated macrophages. Murine macrophage-like cell line RAW 264 was stimulated for 8 h with lipopolysaccharide (10 mg/mL) and interferon- (50 U/mL) in the presence of various concentrations of lidocaine (0–500 mg/mL). NO production was assessed by measuring levels of the stable metabolites, nitrite and nitrate (NOx), in the culture medium with an automatic analyzer using the Griess reaction. Expression of iNOS mRNA in harvested RAW 264 was quantified by Northern blot analysis using mouse iNOS complementary DNA probe. Expression of iNOS protein in the cells was assessed by Western blot analysis using anti-iNOS antibody. Lidocaine dose-dependently attenuated the increase in NOx levels in response to the stimulants. The drug at any concentration failed to decrease iNOS mRNA expression in RAW 264. Lidocaine at 500 mg/mL decreased iNOS protein levels. These data suggest that lidocaine reduced NO production in activated macrophages at multiple levels after transcription. The inhibitory site appeared to vary with the dose of lidocaine.

Implications: Lidocaine dose-dependently inhibited nitric oxide production by activated macrophages, presumably at levels after transcription. The attenuating effect of lidocaine on organ injuries previously reported may be explained by the ability of the drug to suppress this inflammatory mediator.

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Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999