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Published 12 May 2003. doi:10.1083/jcb.200211087
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© The Rockefeller University Press, 0021-9525/2003/5/609 $5.00
The Journal of Cell Biology, Volume 161, Number 3, 609-624


Article

Role of Drosophila Rab5 during endosomal trafficking at the synapse and evoked neurotransmitter release

Tanja Wucherpfennig1,2, Michaela Wilsch-Bräuninger1 and Marcos González-Gaitán1,2

1 Max-Planck Institut für Molekulare Zellbiologie und Genetik, D-01307 Dresden, Germany
2 Max-Planck Institut für Biophysikalische Chemie, D-37077 Göttingen, Germany

Address correspondence to Marcos González-Gaitán, Max-Planck Institute, Pfotenhauerstrasse 108, Dresden, D-01307 Germany. Tel.: 49-551-210-2539. Fax: 49-551-210-1389. E-mail: gonzalez{at}mpi-cbg.de

During constitutive endocytosis, internalized membrane traffics through endosomal compartments. At synapses, endocytosis of vesicular membrane is temporally coupled to action potential–induced exocytosis of synaptic vesicles. Endocytosed membrane may immediately be reused for a new round of neurotransmitter release without trafficking through an endosomal compartment. Using GFP-tagged endosomal markers, we monitored an endosomal compartment in Drosophila neuromuscular synapses. We showed that in conditions in which the synaptic vesicles pool is depleted, the endosome is also drastically reduced and only recovers from membrane derived by dynamin-mediated endocytosis. This suggests that membrane exchange takes place between the vesicle pool and the synaptic endosome. We demonstrate that the small GTPase Rab5 is required for endosome integrity in the presynaptic terminal. Impaired Rab5 function affects endo- and exocytosis rates and decreases the evoked neurotransmitter release probability. Conversely, Rab5 overexpression increases the release efficacy. Therefore, the Rab5-dependent trafficking pathway plays an important role for synaptic performance.

Key Words: neuromuscular junction; FYVE domain; small GTPase; shibire; dynamin


* Abbreviations used in this paper: [Ca2+]e, external Ca2+ concentration; CNS, central nervous system; CSP, cystein string protein; LTR, long terminal repeat; mEJP, miniature excitatory junction potential; NMJ, neuromuscular junction; NT, neurotransmitter; PI(3), phosphatidylinositol-3; PI(3)P, PI(3)-phosphate; PNS, peripheral nervous system; SV, synaptic vesicles.


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