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  • Inhibitory motor innervation of the gall bladder musculature by intrinsic neurones containing nitric oxide in the Australian brush-tailed possum (Trichosurus vulpecula)

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    Author(s)
    Meedeniya, AC
    Al-Jiffry, BO
    Konomi, H
    Schloithe, AC
    Toouli, J
    Saccone, GT
    Griffith University Author(s)
    Meedeniya, Adrian C.
    Year published
    2001
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    Abstract
    BACKGROUND: Gall bladder functions are modulated by neurones intrinsic to the organ. Data are available on the neurochemical composition of intrinsic and extrinsic nerves innervating the gall bladder but are lacking on specific functional classes of gall bladder neurones. AIMS: To characterise the intrinsic motor neurones of the gall bladder and identify their roles using pharmacological techniques. METHODS: Retrograde tracing from the possum gall bladder muscle in vitro allowed identification of intrinsic motor neurones. Subsequently, their content of choline acetyltransferase and nitric oxide synthase, markers of acetylcholine ...
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    BACKGROUND: Gall bladder functions are modulated by neurones intrinsic to the organ. Data are available on the neurochemical composition of intrinsic and extrinsic nerves innervating the gall bladder but are lacking on specific functional classes of gall bladder neurones. AIMS: To characterise the intrinsic motor neurones of the gall bladder and identify their roles using pharmacological techniques. METHODS: Retrograde tracing from the possum gall bladder muscle in vitro allowed identification of intrinsic motor neurones. Subsequently, their content of choline acetyltransferase and nitric oxide synthase, markers of acetylcholine and nitric oxide containing neurones, was established using immunohistochemical techniques. Organ bath pharmacology was used to evaluate neurotransmission by acetylcholine and nitric oxide in gall bladder muscle strips. RESULTS: Innervation of the gall bladder musculature by neurones of both the muscular and serosal plexuses was demonstrated. A large proportion (62%) of these motor neurones were immunoreactive for nitric oxide synthase. All gall bladder neurones showed immunoreactivity for choline acetyltransferase. Organ bath pharmacology confirmed the neuroanatomical data, showing acetylcholine and nitric oxide mediating neurotransmission to the gall bladder musculature. CONCLUSIONS: Neurones containing acetylcholine and nitric oxide, located within the muscular and serosal plexuses, provide excitatory and inhibitory motor innervation of the gall bladder, respectively. The large inhibitory innervation suggests active relaxation of the gall bladder during filling, mediated by intrinsic nerves.
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    Journal Title
    Gut
    Volume
    49
    Issue
    5
    DOI
    https://doi.org/10.1136/gut.49.5.692
    Copyright Statement
    © The Author(s) 2001. The attached file is reproduced here in accordance with the copyright policy of the publisher. For information about this journal please refer to the journal’s website or contact the author[s].
    Subject
    Clinical Sciences
    Paediatrics and Reproductive Medicine
    Publication URI
    http://hdl.handle.net/10072/55027
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    • Journal articles

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