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Proctolin in the lobster nervous system.

K K Siwicki, B S Beltz, T L Schwarz

    Peptides
    |January 1, 1985
    PubMed
    Summary

    The lobster nervous system utilizes the peptide proctolin alongside classical neurotransmitters like serotonin, dopamine, and acetylcholine. This co-localization suggests complex neuronal communication and function in Homarus americanus.

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    Area of Science:

    • Neuroscience
    • Crustacean neurobiology
    • Peptide neurotransmission

    Background:

    • Proctolin, a pentapeptide, is abundant in lobster neurosecretory organs.
    • Approximately 1400 proctolin-immunoreactive neurons exist in the lobster central nervous system.
    • These neurons likely have diverse functional roles.

    Purpose of the Study:

    • To identify classical neurotransmitters co-localized with proctolin in specific lobster neurons.
    • To investigate the physiological functions of proctolin and its interactions with co-transmitters.
    • To explore the development of multiple neurotransmitter phenotypes within single neurons.

    Main Methods:

    • Biochemical analysis of identified neurons.
    • Immunohistochemistry to detect proctolin and neurotransmitters.
    • Electrophysiological studies to assess neuronal function.

    Main Results:

    • Serotonin-proctolin and dopamine-proctolin co-localization identified in specific ganglia.
    • Cholinergic-proctolin sensory neurons innervating a mechanoreceptor were characterized.
    • Initial investigations into proctolin's physiological actions and co-transmitter interactions commenced.

    Conclusions:

    • Lobster neurons exhibit complex neurotransmitter phenotypes, co-localizing proctolin with classical transmitters.
    • This co-localization points to sophisticated neural signaling mechanisms in crustaceans.
    • Further research is needed to fully elucidate the functional significance of these multi-transmitter systems.

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