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Dvl regulates endo‐ and exocytotic processes through binding to synaptotagmin
Author(s) -
Kishida Shosei,
Hamao Kozue,
Inoue Makoto,
Hasegawa Mamoru,
Matsuura Yoshiharu,
Mikoshiba Katsuhiko,
Fukuda Mitsunori,
Kikuchi Akira
Publication year - 2007
Publication title -
genes to cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.912
H-Index - 115
eISSN - 1365-2443
pISSN - 1356-9597
DOI - 10.1111/j.1365-2443.2006.01030.x
Subject(s) - microbiology and biotechnology , synaptotagmin 1 , biology , endocytosis , synaptotagmin i , dorsal root ganglion , gene knockdown , dishevelled , exocytosis , neurite , wnt signaling pathway , vesicle , synaptic vesicle , signal transduction , anatomy , biochemistry , receptor , secretion , gene , frizzled , dorsum , membrane , in vitro
Dvl, an important component of the Wnt signalling pathway, is thought to be involved in synaptogenesis. In this study, we investigated whether Dvl regulates neurotransmitter release. Knockdown of Dvl in PC12 cells suppressed K + ‐induced dopamine release, and this phenotype was restored by expression of Dvl‐1. We identified synaptotagmin (Syt) I, which is involved in neurotransmitter release, as a Dvl‐binding protein. Dvl directly bound to the C2B domain of Syt I. Dvl colocalized with Syt I at the tip of neurites of differentiated PC12 cells and of neurons in the rat dorsal root ganglion. Dvl and Syt I was located in large dense‐core vesicles, which contain dopamine. In addition, endocytosis of vesicles containing Syt I was suppressed in Dvl knockdown PC12 cells. Dvl inhibited the binding of Syt I to the complex consisting of syntaxin‐1A and SNAP‐25. Furthermore, µ2‐adaptin of AP‐2, which is known to play a role in endocytosis, formed a complex with Dvl and Syt I. Taken together, these results suggest that Dvl is involved in endo‐ and exocytotic processes through the binding to Syt I.