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JIP3 mediates TrkB axonal anterograde transport and enhances BDNF signaling by directly bridging TrkB with kinesin-1.

Authors: Huang, Shu-Hong  Duan, Shan  Sun, Tao  Wang, Jue  Zhao, Ling  Geng, Zhao  Yan, Jing  Sun, Hai-Ji  Chen, Zhe-Yu 
Citation: Huang SH, etal., J Neurosci. 2011 Jul 20;31(29):10602-14. doi: 10.1523/JNEUROSCI.0436-11.2011.
Pubmed: (View Article at PubMed) PMID:21775604
DOI: Full-text: DOI:10.1523/JNEUROSCI.0436-11.2011

Brain-derived neurotrophic factor (BDNF), secreted from target tissues, binds and activates TrkB receptors, located on axonal terminals of the innervating neurons, and thereby initiates retrograde signaling. Long-range anterograde transport of TrkB in axons and dendrites requires kinesin-mediated transport. However, it remains unknown whether anterograde TrkB transport mechanisms are the same in axons versus in dendrites. Here, we show that c-Jun NH(2)-terminal kinase-interacting protein 3 (JIP3) binds directly to TrkB, via a minimal 12 aa domain in the TrkB juxtamembrane region, and links TrkB to kinesin-1. The JIP3/TrkB interaction selectively drives TrkB anterograde transport in axons but not in dendrites of rat hippocampal neurons. Moreover, we find that TrkB axonal transport mediated by JIP3 could regulate BDNF-induced Erk activation and axonal filopodia formation. Our findings demonstrate a role for JIP3-mediated TrkB anterograde axonal transport in recruiting more TrkB into distal axons and facilitating BDNF-induced retrograde signaling and synapse modulation, which provides a novel mechanism of how the TrkB anterograde transport can be coupled to BDNF signaling in distal axons.

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CRRD Object Information
CRRD ID: 13673858
Created: 2018-06-23
Species: All species
Last Modified: 2018-06-23
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.