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- W1981376791 abstract "Endocytosis of synaptic vesicles follows exocytosis, and both processes require external Ca(2+). However, it is not known whether Ca(2+) influx through one route initiates both processes. At larval Drosophila neuromuscular junctions, we separately measured exocytosis and endocytosis using FM1-43. In a temperature-sensitive Ca(2+) channel mutant, cacophony(TS2), exocytosis induced by high K(+) decreased at nonpermissive temperatures, while endocytosis remained unchanged. In wild-type larvae, a spider toxin, PLTXII, preferentially inhibited exocytosis, whereas the Ca(2+) channel blockers flunarizine and La(3+) selectively depressed endocytosis. None of these blockers affected exocytosis or endocytosis induced by a Ca(2+) ionophore. Evoked synaptic potentials were depressed regardless of stimulus frequency in cacophony(TS2) at nonpermissive temperatures and in wild-type by PLTXII, whereas flunarizine or La(3+) gradually depressed synaptic potentials only during high-frequency stimulation, suggesting depletion of synaptic vesicles due to blockade of endocytosis. In shibire(ts1), a dynamin mutant, flunarizine or La(3+) inhibited assembly of clathrin at the plasma membrane during stimulation without affecting dynamin function." @default.
- W1981376791 created "2016-06-24" @default.
- W1981376791 creator A5013761124 @default.
- W1981376791 creator A5057017831 @default.
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- W1981376791 date "2004-01-01" @default.
- W1981376791 modified "2023-09-27" @default.
- W1981376791 title "Ca2+ Influx through Distinct Routes Controls Exocytosis and Endocytosis at Drosophila Presynaptic Terminals" @default.
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- W1981376791 doi "https://doi.org/10.1016/s0896-6273(03)00815-8" @default.
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