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Related Experiment Videos

Morphological and biochemical changes in supersensitive smooth muscle.

D P Westfall, T J Lee, R E Stitzel

    Federation Proceedings
    |September 1, 1975
    PubMed
    Summary

    Postganglionic denervation of the vas deferens increases cell contacts and adenosine triphosphate (ATP) levels. These changes correlate with heightened smooth muscle sensitivity, suggesting ATP shifts are early events in neural interruption.

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    Area of Science:

    • Neuroscience
    • Physiology
    • Cell Biology

    Background:

    • The vas deferens smooth muscle exhibits supersensitivity and increased response after denervation.
    • Neural pathways regulate smooth muscle function, and their interruption leads to adaptive changes.

    Purpose of the Study:

    • To investigate the impact of postganglionic denervation on cell contacts in rat vas deferens smooth muscle.
    • To examine the effects of denervation, decentralization, and reserpine on adenosine triphosphate (ATP) concentrations in rat and guinea pig vasa deferentia.
    • To correlate changes in ATP concentration with the development of smooth muscle supersensitivity.

    Main Methods:

    • Studied the incidence of nexal contacts in chronically denervated rat vas deferens compared to controls.
    • Measured endogenous norepinephrine and ATP concentrations in vasa deferentia following denervation, decentralization, or reserpine pretreatment.
    • Assessed the temporal relationship between ATP concentration changes and the development of vas deferens supersensitivity.

    Main Results:

    • Denervated vas deferens showed a twofold increase in nexal contacts compared to control tissue.
    • Denervation led to a significant decrease in norepinephrine and ATP concentrations one day post-surgery, with norepinephrine remaining low.
    • ATP concentration increased significantly after the first postoperative day, correlating with postjunctional supersensitivity.
    • Decentralization and reserpine pretreatment also increased ATP concentration, preceding enhanced vas deferens sensitivity by 2-3 days.

    Conclusions:

    • Increased cell contacts in denervated vas deferens may contribute to supersensitivity and increased maximum response.
    • Changes in tissue ATP concentration appear to be an early event following neural contact interruption to vas deferens smooth muscle.
    • ATP level modulation is linked to the development of supersensitivity in the smooth muscle of the vas deferens.

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