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Peripheral transmission in primary sensory nerves.

I Muramatsu

    Japanese Journal of Pharmacology
    |February 1, 1987
    PubMed
    Summary

    Primary sensory nerves transmit signals to the central nervous system and the periphery, mediating defense responses like neurogenic inflammation. Tachykinins are identified as key neurotransmitters in these peripheral nerve pathways.

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    Area of Science:

    • Neuroscience
    • Pharmacology
    • Ophthalmology

    Background:

    • Primary sensory nerves transmit signals bidirectionally, not just to the central nervous system but also to peripheral tissues.
    • Peripheral responses include defense mechanisms such as neurogenic inflammation, characterized by miosis and blood-aqueous barrier breakdown in the eye, and vasodilation/plasma extravasation in the skin.

    Purpose of the Study:

    • To investigate the role of tachykinins as neurotransmitters in primary sensory nerve peripheral endings.
    • To explore the influence of neuromodulators and irritants on peripheral neurotransmission using experimental models.

    Main Methods:

    • Pharmacological, biochemical, and immunohistochemical analyses were employed.
    • Studies utilized trigeminal nerve-innervated and isolated rabbit iris sphincter muscle preparations.

    Main Results:

    • Tachykinins have been identified as the most probable transmitters at both peripheral and central endings of primary sensory nerves.
    • Peripheral neurotransmission in the rabbit iris sphincter muscle was shown to be modulated by various neuromodulators and irritants.

    Conclusions:

    • Tachykinins are key mediators of peripheral responses mediated by primary sensory nerves.
    • Neurotransmission mechanisms at peripheral nerve endings may be analogous to those at central endings, suggesting conserved signaling pathways.

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