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Endogenous Truncated TrkB.T1 Receptor Regulates Neuronal Complexity and TrkB Kinase Receptor Function In Vivo

Carim-Todd, Laura, Bath, Kevin G., Fulgenzi, Gianluca, Yanpallewar, Sudhirkumar, Jing, Deqiang, Barrick, Colleen A., Becker, Jodi, Buckley, Hannah, Dorsey, Susan G., Lee, Francis S., Tessarollo, Lino·2009·The Journal of Neuroscience
DOI 10.1523/jneurosci.5060-08.2009PMC PMC2719435
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Abstract

Pathological or in vitro overexpression of the truncated TrkB (TrkB.T1) receptor inhibits signaling through the full-length TrkB (TrkB.FL) tyrosine kinase receptor. However, to date, the role of endogenous TrkB.T1 is still unknown. By studying mice lacking the truncated TrkB.T1 isoform but retaining normal spatiotemporal expression of TrkB.FL, we have analyzed TrkB.T1-specific physiological functions and its effect on endogenous TrkB kinase signaling in vivo. We found that TrkB.T1-deficient mice develop normally but show increased anxiety in association with morphological abnormalities in the length and complexity of neurites of neurons in the basolateral amygdala. However, no behavioral abnormalities were detected in hippocampal-dependent memory tasks, which correlated with lack of any obvious hippocampal morphological deficits or alterations in basal synaptic transmission and long-term potentiation.In vivo reduction of TrkB signaling by removal of one BDNF allele could be partially rescued by TrkB.T1 deletion, which was revealed by an amelioration of the enhanced aggression and weight gain associated with BDNF haploinsufficiency. Our results suggest that, at the physiological level, TrkB.T1 receptors are important regulators of TrkB.FL signaling in vivo. Moreover, TrkB.T1 selectively affects dendrite complexity of certain neuronal populations.

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Metadata

Authors
Carim-Todd, L., Bath, K. G., Fulgenzi, G., Yanpallewar, S., Jing, D., Barrick, C. A., Becker, J., Buckley, H., Dorsey, S. G., Lee, F. S., & Tessarollo, L.
Venue
The Journal of Neuroscience
Publisher
Society for Neuroscience
Published
2009-01-21
Volume
29
Issue
3
Pages
678-685
ISSN
  • 0270-6474
  • 1529-2401
DOI
10.1523/jneurosci.5060-08.2009
PMC
PMC2719435
Cited by
138
References
4
Language
en
Licence
creativecommons.org/licenses/by-nc-sa/4.0/ (vor, 181 d)

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