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Abstract:
Molecular dependence of vesicular endocytosis was investigatedwith capacitance measurements at the calyx of Held terminalin brainstem slices. Intraterminal loading of botulinum toxinE revealed that the rapid capacitance transient implicated as"kiss-and-run" was unrelated to transmitter release. The release-relatedcapacitance change decayed with an endocytotic time constantof 10 to 25 seconds, depending on the magnitude of exocytosis.Presynaptic loading of the nonhydrolyzable guanosine 5'-triphosphate(GTP) analog GTPgS or dynamin-1 proline-rich domain peptideabolished endocytosis. These compounds had no immediate effecton exocytosis, but caused a use-dependent rundown of exocytosis.Thus, the guanosine triphosphatase dynamin-1 is indispensablefor vesicle endocytosis at this fast central nervous system(CNS) synapse.
Department of Neurophysiology, University of Tokyo Graduate School of Medicine, Tokyo 113-0033, Japan.
* To whom correspondence should be addressed. E-mail: ttakahas-tky{at}umin.ac.jp
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