Journal
DEVELOPMENTAL CELL
Volume 16, Issue 5, Pages 675-686Publisher
CELL PRESS
DOI: 10.1016/j.devcel.2009.03.005
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Funding
- Core Research for Evolutional Science and Technology (CREST) of the Japan Science and Technology Agency (JST)
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) [20227006, 17024024, 18700314, 20700332]
- Japan Society for the Promotion of Science (JSPS) [15GS0319, 20-9883]
- Ministry of Health, Labour and Welfare [18-8]
- Grants-in-Aid for Scientific Research [20227006, 17024024, 18700314, 20700332, 15GS0319] Funding Source: KAKEN
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The neurotrophin receptors TrkA, TrkB, and TrkC are localized at the surface of the axon terminus and transmit key signals from brain-derived neurotrophic factor (BDNF) for diverse effects on neuronal survival, differentiation, and axon formation. Trk receptors are sorted into axons via the anterograde transport of vesicles and are then inserted into axonal plasma membranes. However, the transport mechanism remains largely unknown. Here, we show that the Slp1/Rab27B/CRMP-2 complex directly links TrkB to Kinesin-1, and that this association is required for the anterograde transport of TrkB-containing vesicles. The cytoplasmic tail of TrkB binds to Slp1 in a Rab27B-dependent manner, and CRMP-2 connects Slp1 to Kinesin-1. Knockdown of these molecules by siRNA reduces the anterograde transport and membrane targeting of TrkB, thereby inhibiting BDNF-induced ERK1/2 phosphorylation in axons. Our data reveal a molecular mechanism for the selective anterograde transport of TrkB in axons and show how the transport is coupled to BDNF signaling.
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