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    The Effect of Endogenous 5-HT on K Ion Enhancement of Ciliary Activity in the Mussel Mytilus edulis

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    Subject
    5-HT; K Ion; ciliary activity; mussel; Mytilus; serotonin; lateral cilia; bromolysergic acid; PCPA; cilioexcitatory
    Author
    Paparo, Anthony A.; Cunningham-Paparo, Kathleen; Murphy, Judith
    Journal Title
    Scas: Bulletin of the Southern California Academy of Sciences
    Volume
    76
    Issue
    scas/vol76/iss2; 2
    Metadata
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    URI
    https://scholar.oxy.edu/handle/20.500.12711/10651
    Abstract
    The cilioexcitatory effect of 5-HT (serotonin) on lateral cilia has been observed in Mytilus. In the presence of exogenous 5-HT. K ions enhanced the cilioexcitatory effect of 5-HT after a 3 s lag period. Addition of BOL (bromolysergic acid: 5-HT inhibitor decreased the cilioexcitatory effect of 5-HT. An increase in the lag period was also observed. Addition of PCPA (p-chlorophenylalanine; tryptophan hydroxylase inhibitor) decreased endogenous stores of 5-HT and the cilioexcitatory effect of K ions. An increase in the lag period was also observed. The present investigation shows that K ions have a cilioexcitatory effect on lateral cilia after producing a momentary lag period. Furthermore, the presence of 5-HT is required to bring about the cilioexcitatory effect of K ions.
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