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Expression and function of TrkB variants in developing sensory neurons

N Ninkina1, J Adu, A Fischer

  • 1School of Biological and Medical Sciences, University of St Andrews, UK.

The EMBO Journal
|December 2, 1996
PubMed
Summary

Mouse trigeminal neurons

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Area of Science:

  • Neuroscience
  • Molecular Biology

Background:

  • Neurotrophins like BDNF and NGF are crucial for neuronal survival.
  • Trigeminal neurons exhibit distinct neurotrophin dependencies during development.

Purpose of the Study:

  • To investigate the role of TrkB receptor variants in BDNF signaling during neuronal development.
  • To understand how different TrkB forms modulate BDNF responsiveness in sensory neurons.

Main Methods:

  • Analysis of TrkB receptor transcript expression in mouse trigeminal neurons at different developmental stages.
  • RNA analysis from purified neurons.
  • Infection of NGF-dependent sympathetic neurons with TrkB expression plasmids.

Main Results:

  • TrkB receptor transcripts are differentially expressed during neuronal development, correlating with neurotrophin dependence.
  • Catalytic TrkB expression supports BDNF survival signaling.
  • Non-catalytic TrkB variants inhibit BDNF signaling mediated by catalytic TrkB.

Conclusions:

  • The balance of catalytic and non-catalytic TrkB receptor variants regulates BDNF responsiveness in developing sensory neurons.
  • Differential expression of TrkB isoforms plays a critical role in developmental neurotrophin signaling plasticity.

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