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Research ArticleArticle

Gastrointestinal Function Regulation by Nitrergic Efferent Nerves

Noboru Toda and Arnold G. Herman
Pharmacological Reviews September 2005, 57 (3) 315-338; DOI: https://doi.org/10.1124/pr.57.3.4
Noboru Toda
Toyama Institute for Cardiovascular Pharmacology Research, Azuchi-machi, Chuo-ku, Osaka, Japan (N.T.); and Division of Pharmacology, University of Antwerp, Wilrijk, Belgium (A.G.H.)
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Arnold G. Herman
Toyama Institute for Cardiovascular Pharmacology Research, Azuchi-machi, Chuo-ku, Osaka, Japan (N.T.); and Division of Pharmacology, University of Antwerp, Wilrijk, Belgium (A.G.H.)
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Abstract

Gastrointestinal (GI) smooth muscle responses to stimulation of the nonadrenergic noncholinergic inhibitory nerves have been suggested to be mediated by polypeptides, ATP, or another unidentified neurotransmitter. The discovery of nitric-oxide (NO) synthase inhibitors greatly contributed to our understanding of mechanisms involved in these responses, leading to the novel hypothesis that NO, an inorganic, gaseous molecule, acts as an inhibitory neurotransmitter. The nerves whose transmitter function depends on the NO release are called “nitrergic”, and such nerves are recognized to play major roles in the control of smooth muscle tone and motility and of fluid secretion in the GI tract. Endothelium-derived relaxing factor, discovered by Furchgott and Zawadzki, has been identified to be NO that is biosynthesized from l-arginine by the constitutive NO synthase in endothelial cells and neurons. NO as a mediator or transmitter activates soluble guanylyl cyclase and produces cyclic GMP in smooth muscle cells, resulting in relaxation of the vasculature. On the other hand, NO-induced GI smooth muscle relaxation is mediated, not only by cyclic GMP directly or indirectly via hyperpolarization, but also by cyclic GMP-independent mechanisms. Numerous cotransmitters and cross talk of autonomic efferent nerves make the neural control of GI functions complicated. However, the findingsrelated to the nitrergic innervation may provide us a new way of understanding GI tract physiology and pathophysiology and might result in the development of new therapies of GI diseases. This review article covers the discovery of nitrergic nerves, their functional roles, and pathological implications in the GI tract.

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Pharmacological Reviews: 57 (3)
Pharmacological Reviews
Vol. 57, Issue 3
1 Sep 2005
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Research ArticleArticle

Gastrointestinal Function Regulation by Nitrergic Efferent Nerves

Noboru Toda and Arnold G. Herman
Pharmacological Reviews September 1, 2005, 57 (3) 315-338; DOI: https://doi.org/10.1124/pr.57.3.4

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Research ArticleArticle

Gastrointestinal Function Regulation by Nitrergic Efferent Nerves

Noboru Toda and Arnold G. Herman
Pharmacological Reviews September 1, 2005, 57 (3) 315-338; DOI: https://doi.org/10.1124/pr.57.3.4
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  • Article
    • Abstract
    • I. Introduction
    • II. Nitric Oxide as a Neurotransmitter
    • III. Nitrergic Innervation in Various Regions
    • IV. Secretion and Neurogenic Nitric Oxide
    • V. Species and Regional Differences in the Nitrergic Regulation
    • VI. Development and Aging
    • VII. Prejunctional Regulation
    • VIII. Gastrointestinal Blood Flow Regulation by Nitrergic Nerves
    • IX. Pathological Implications
    • X. Summary
    • Acknowledgments
    • Footnotes
    • References
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