Ultrafast Exocytosis Elicited by Calcium Current in Synaptic Terminals of Retinal Bipolar Neurons

  title={Ultrafast Exocytosis Elicited by Calcium Current in Synaptic Terminals of Retinal Bipolar Neurons},
  author={Steven J Mennerick and Gary Matthews},
Using high resolution capacitance measurements, we have characterized an ultrafast component of transmitter release in ribbon-type synaptic terminals of retinal bipolar neurons. During depolarization, capacitance increases to a plateau of approximately 30 fF with a time constant of approximately 1.5 ms. When not limited by activation kinetics of calcium current, the small pool is depleted even faster, with a time constant of 0.5 ms. After the ultrafast pool is depleted, capacitance rises with a… CONTINUE READING
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