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EMBO J. 1995 Sep 15; 14(18): 4482–4489.
PMCID: PMC394540

Developmental changes in NT3 signalling via TrkA and TrkB in embryonic neurons.


Neurotrophins promote neuronal survival by signalling through Trk receptor tyrosine kinases: nerve growth factor signals through TrkA, brain-derived neurotrophic factor (BDNF) and neurotrophin (NT)4 through TrkB and NT3 through TrkC. Although studies in some, but not all, cell lines indicate that NT3 can also signal through TrkA and TrkB, it is not known if such signalling can occur in neurons. We show that NT3 can promote the in vitro survival of sensory and sympathetic neurons isolated from embryos that are homozygous for a null mutation in the trkC gene. During the mid-embryonic period, NT3 promoted the survival of as many trigeminal and nodose neurons as the preferred neurotrophins, NGF and BDNF. However, later in development, these neurons lost their ability to respond to NT3. NT3 also promoted the survival of almost all sympathetic neurons, but no decrease in effectiveness was observed during development. Trigeminal neurons from trkC-/- trkA-/- embryos did not respond to NT3 and nodose neurons from trkB-/- embryos likewise failed to respond to NT3. These results show that NT3 can signal through TrkA and TrkB in neurons at certain stages of development and may explain why the phenotype of NT3-/- mice is more severe than that of trkC-/- mice.

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Selected References

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