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The Journal of Neuroscience, September 15, 2000, 20(18):6830-6838
Ca2+/Calmodulin-Dependent Facilitation and
Inactivation of P/Q-Type Ca2+ Channels
Amy
Lee,
Todd
Scheuer, and
William A.
Catterall
Department of Pharmacology, University of Washington, Seattle,
Washington 98195-7280
Trains of action potentials cause Ca2+-dependent
facilitation and inactivation of presynaptic P/Q-type
Ca2+ channels that can alter synaptic efficacy. A
potential mechanism for these effects involves calmodulin, which
associates in a Ca2+-dependent manner with the
pore-forming 1A subunit. Here, we report that
Ca2+ and calmodulin dramatically enhance
inactivation and facilitation of P/Q-type Ca2+
channels containing the auxiliary 2a subunit compared
with their relatively small effects on channels with 1b.
Tetanic stimulation causes an initial enhancement followed by a gradual
decline in P/Q-type Ca2+ currents over time.
Recovery of Ca2+ currents from facilitation and
inactivation is relatively slow (30 sec to 1 min). These effects are
strongly inhibited by high intracellular BAPTA, replacement of
extracellular Ca2+ with Ba2+, and
a calmodulin inhibitor peptide. The
Ca2+/calmodulin-dependent facilitation and
inactivation of P/Q-type Ca2+ channels
observed here are consistent with the behavior of presynaptic Ca2+ channels in neurons, revealing how dual
feedback regulation of P/Q-type channels by Ca2+ and
calmodulin could contribute to activity-dependent synaptic plasticity.
Key words:
calcium channel; calmodulin; synaptic plasticity; inactivation; facilitation; action potential
Copyright © 2000 Society for Neuroscience 0270-6474/00/20186830-09$05.00/0
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