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dCIP4 (Drosophila Cdc42-interacting protein 4) restrains synaptic growth by inhibiting the secretion of the retrograde glass bottom boat signal

Title
dCIP4 (Drosophila Cdc42-interacting protein 4) restrains synaptic growth by inhibiting the secretion of the retrograde glass bottom boat signal
Authors
Nahm M.Kim S.Paik S.K.Lee M.Lee S.Lee Z.H.Kim J.Lee D.Bae Y.C.
Ewha Authors
김재상이대기
SCOPUS Author ID
김재상scopus; 이대기scopus
Issue Date
2010
Journal Title
Journal of Neuroscience
ISSN
0270-6474JCR Link
Citation
vol. 30, no. 24, pp. 8138 - 8150
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The bone morphogenetic protein (BMP) ligand Glass bottom boat (Gbb) acts as a retrograde growth signal at the Drosophila neuromuscular junction (NMJ). Endocytic regulation of presynaptic BMP receptors has been proposed to attenuate retrograde BMP signaling. However, it remains unknown whether the Gbb signal is also regulated by postsynaptic mechanisms. Here, we provide evidence that Drosophila Cdc42-interacting protein 4 (dCIP4) functions postsynaptically to inhibit synaptic growth. dCIP4 is localized postsynaptically at NMJs. dcip4 mutations lead to synaptic overgrowth and increased presynaptic phosphorylated mothers against decapentaplegic (Mad) levels, and these defects are rescued by muscle-specific expression of dCIP4. Biochemical and genetic analyses demonstrate that dCIP4 acts downstream of Cdc42 to activate the postsynaptic Wsp-Arp2/3 pathway. We also show that BMP signaling is necessary for synaptic overgrowth in larvae lacking postsynaptic dcip4 or wsp. Finally, dCIP4 and Wsp inhibit Gbb secretion. Thus, we propose that dCIP4 restrains synaptic growth by inhibiting postsynaptic Gbb secretion through the Wsp-Arp2/3 pathway. Copyright © 2010 the authors.
DOI
10.1523/JNEUROSCI.0256-10.2010
Appears in Collections:
자연과학대학 > 생명과학전공 > Journal papers
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