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During the formation of neuronal circuits, neurons respond to diffusible cues secreted by target tissues. Often, target-derived signals act on nerve terminals to influence local growth events; in other cases, they are transported long distances back to neuronal cell bodies to effect transcriptional changes necessary for neuronal survival and differentiation. Neurotrophins provide one of the best examples...
Endocytic events are critical for neuronal survival in response to target-derived neurotrophic cues, but whether local axon growth is mediated by endocytosis-dependent signaling mechanisms remains unclear. Here, we report that Nerve Growth Factor (NGF) promotes endocytosis of its TrkA receptors and axon growth by calcineurin-mediated dephosphorylation of the endocytic GTPase dynamin1. Conditional...
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