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Inhibition of endocytosis by elevated internal calcium in a synaptic terminal

Nature volume 370, pages 652–655 (1994)Cite this article

Abstract

DURING synaptic transmission in the nervous system, synaptic vesicles fuse with the plasma membrane of presynaptic terminals, releasing neurotransmitter by exocytosis1,2. The vesicle membrane is then retrieved by endocytosis and recycled into new transmitter-containing vesicles3–6. Exocytosis in synaptic terminals is calcium-dependent7–9, and we now report that endocytosis also is regulated by the intracellular calcium concentration ([Ca2+]i). Capacitance measurements10,11 in synaptic terminals of retinal bipolar neurons revealed that endocytosis was strongly inhibited by elevated [Ca2+]i in the range achieved by Ca2+-current activation. The rate of membrane retrieval was steeply dependent on [Ca2+]i, with a Hill coefficient of 4 and half-inhibition at ∼500 nM. At [Ca2+]i≥900 nM, endocytosis was entirely absent. The action of internal calcium on endocytosis represents a novel negative-feed-back mechanism controlling the rate of membrane recovery in synaptic terminals after neurotransmitter secretion. As membrane retrieval is the first step in vesicle recycling, this mechanism may contribute to activity-dependent synaptic depression.

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Authors and Affiliations

  1. Department of Neurobiology and Behavior, State University of New York, Stony Brook, New York, 11794-5230, USA

    Henrique von Gersdorff & Gary Matthews

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  1. Henrique von Gersdorff
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  2. Gary Matthews
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von Gersdorff, H., Matthews, G. Inhibition of endocytosis by elevated internal calcium in a synaptic terminal. Nature 370, 652–655 (1994). https://doi.org/10.1038/370652a0

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