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    Calcium-activated potassium conductance in presynaptic terminals at the crayfish neuromuscular junction

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    Bittner_JGP_1991_2.pdf (1.328Mb)
    Date
    1991-12-01
    Author
    Sivaramakrishnan, Shobhana
    Bittner, George D.
    Brodwick, Malcolm S.
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    Abstract
    Membrane potential changes that typically evoke transmitter release were studied by recording intracellularly from the excitor axon near presynaptic terminals of the crayfish opener neuromuscular junction. Depolarization of the presynaptic terminal with intracellular current pulses activated a conductance that caused a decrease in depolarization during the constant current pulse. This conductance was identified as a calcium-activated potassium conductance, g~c~), by its disappearance in a zero-calcium/EGTA medium and its block by cadmium, barium, tetraethylammonium ions, and charybdotoxin. In addition to gK~c,), a delayed rectifier potassium conductance (gK) is present in or near the presynaptic terminal. Both these potassium conductances are involved in the repolarization of the membrane during a presynaptic action potential.
    Department
    Neuroscience
    Subject
    presynaptic terminals
    potassium conductance
    calcium-activated potassium conductance
    crayfish neuromuscular junction
    crayfish
    URI
    http://hdl.handle.net/2152/37842
    xmlui.dri2xhtml.METS-1.0.item-citation
    S. Sivaramakrishnan, G.D. Bittner, and M.S. Brodwick. 1991. Calcium-activated potassium conductance in presynaptic terminals at crayfish neuromuscular junction. J. Gen. Physiol. 98:1161-1180.
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