Retrograde BMP signaling controls synaptic growth at the NMJ by regulating trio expression in motor neurons.
Neuron
; 66(4): 536-49, 2010 May 27.
Article
em En
| MEDLINE
| ID: mdl-20510858
ABSTRACT
Retrograde signaling is essential for coordinating the growth of synaptic structures; however, it is not clear how it can lead to modulation of cytoskeletal dynamics and structural changes at presynaptic terminals. We show that loss of retrograde bone morphogenic protein (BMP) signaling at the Drosophila larval neuromuscular junction (NMJ) leads to a significant reduction in levels of Rac GEF Trio and a diminution of transcription at the trio locus. We further find that Trio is required in motor neurons for normal structural growth. Finally, we show that transgenic expression of Trio in motor neurons can partially restore NMJ defects in larvae mutant for BMP signaling. Based on our findings, we propose a model in which a retrograde BMP signal from the muscle modulates GTPase activity through transcriptional regulation of Rac GEF trio, thereby regulating the homeostasis of synaptic growth at the NMJ.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fosfoproteínas
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Sinapses
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Proteínas Serina-Treonina Quinases
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Proteínas Morfogenéticas Ósseas
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Fatores de Troca do Nucleotídeo Guanina
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Proteínas de Drosophila
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Neurônios Motores
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Junção Neuromuscular
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article