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OtherPULMONARY PHARMACOLOGY

Inhibition of 5-Lipoxygenase Diminishes Neurally Evoked Tachykinergic Contraction of Guinea Pig Isolated Airway

M. Allen Mcalexander, Allen C. Myers and Bradley J. Undem
Journal of Pharmacology and Experimental Therapeutics May 1998, 285 (2) 602-607;
M. Allen Mcalexander
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Allen C. Myers
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Bradley J. Undem
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Abstract

The role of endogenous 5-lipoxygenase products in modulating tachykinergic neurotransmission in guinea pig isolated trachea was investigated. Tachykinin-containing afferent nerve fibers were stimulated with either electrical field stimulation or antidromic stimulation of the right vagus nerve. This resulted in contractions of the isolated caudal trachea and bronchus that could be blocked with either tetrodotoxin or a combination of neurokinin-1 and neurokinin-2 receptor antagonists. The 5-lipoxygenase inhibitor ZD 2138 (1 μM) significantly inhibited these neurally mediated tachykinergic contractions, by approximately 50%, yet had no effect on the contractions evoked by stimulating tachykinergic fibers in an action potential-independent fashion with capsaicin or by exogenously applied neurokinin A. The effect of ZD 2138 on action potential-driven tachykinergic contractions was mimicked by pobilukast, pranlukast, montelukast and zafirlukast, four structurally unrelated antagonists of the cysteinyl leukotriene 1 receptor subtype. Pobilukast had no effect on the tachykinergic contraction in tissues pretreated with ZD 2138. Likewise, ZD 2138 had no effect on the tachykinergic contractions in tissues pretreated with pobilukast. Intracellular electrophysiological recording of the membrane properties of jugular ganglion neurons, the source of tachykinins in the guinea pig trachea/bronchus, demonstrated that leukotriene D4 caused a membrane depolarization of vagal afferent C-fiber neurons and an increase in input impedance, both of which were abolished by zafirlukast. Taken together, these data indicate that in the resting guinea pig isolated trachea/bronchus, endogenous 5-lipoxygenase activity leads to the production of cysteinyl leukotrienes that amplify action potential-dependent release of tachykinins from airway afferent nerve fibers.

Footnotes

  • Send reprint requests to: Bradley J. Undem, Johns Hopkins Asthma and Allergy Center, 5501 Hopkins Bayview Circle, Baltimore, MD 21224.

  • ↵1 This work was supported by research grants from the National Heart, Lung, and Blood Institute of the National Institutes of Health, Bethesda, MD.

  • Abbreviations:
    5-LO
    5-lipoxygenase
    DMSO
    dimethyl sulfoxide
    NK
    neurokinin
    cys-LT
    cysteinyl leukotriene
    LTD4
    leukotriene D4
    LNNA
    N-ω-nitro-l-arginine
    EFS
    electrical field stimulation
    NANC
    nonadrenergic, noncholinergic
    • Received July 24, 1997.
    • Accepted January 29, 1998.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics
Vol. 285, Issue 2
1 May 1998
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OtherPULMONARY PHARMACOLOGY

Inhibition of 5-Lipoxygenase Diminishes Neurally Evoked Tachykinergic Contraction of Guinea Pig Isolated Airway

M. Allen Mcalexander, Allen C. Myers and Bradley J. Undem
Journal of Pharmacology and Experimental Therapeutics May 1, 1998, 285 (2) 602-607;

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OtherPULMONARY PHARMACOLOGY

Inhibition of 5-Lipoxygenase Diminishes Neurally Evoked Tachykinergic Contraction of Guinea Pig Isolated Airway

M. Allen Mcalexander, Allen C. Myers and Bradley J. Undem
Journal of Pharmacology and Experimental Therapeutics May 1, 1998, 285 (2) 602-607;
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