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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 alpha 1A subunit. Here, we report that Ca2+ and calmodulin dramatically enhance inactivation and facilitation of P/Q-type Ca2+ channels containing the auxiliary beta 2a subunit compared with their relatively small effects on channels with beta 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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