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Endophilin B1 as a novel regulator of nerve growth factor/TrkA trafficking and neurite outgrowth

Authors Wan, Jun View this author's profile
Cheung, Anthony Y.
Fu, Wing Yu HKUST affiliated (currently or previously)
Wu, Chengbiao
Zhang, Mingjie View this author's profile
Mobley, William C.
Cheung, Zelda H.Y. HKUST affiliated (currently or previously)
Ip, Nancy Y.Y. View this author's profile
Issue Date 2008
Source Journal of Neuroscience , v. 28, (36), 2008, SEP 3, p. 9002-9012
Summary Neurotrophins and their cognate receptors Trks are important regulators of neuronal survival and differentiation. Recent studies reveal that internalization and trafficking of Trks play a critical role in neurotrophin-mediated signaling. At present, little is known of the molecular events that mediate this process. In the current study, we show that endophilin B1 is a novel regulator of nerve growth factor (NGF) trafficking. We found that endophilin B1 interacts with both TrkA and early endosome marker EEA1. Interestingly, knockdown of endophilin B1 results in enlarged EEA1-positive vesicles in NGF-treated PC12 cells. This is accompanied by increased lysosomal targeting of NGF/TrkA and TrkA degradation, and reduced total TrkA levels. In addition, knockdown of endophilin B1 attenuates Erk1/2 activation in the endosomal fraction after NGF treatment. This is accompanied by a marked inhibition of NGF-induced gene transcription and neurite outgrowth in endophilin B1-knocked down cells. Our observations implicate endophilin B1 as a novel regulator of NGF trafficking, thereby affecting TrkA levels and downstream signaling on endosomes to mediate biological functions of NGF.
ISSN 0270-6474
Rights The Society for Neuroscience is the copyright holder for the work.
Language English
Format Article
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