Brain-derived neurotrophic factor overexpression induces precocious critical period in mouse visual cortex

Hanover, J. L., Huang, Z. J., Tonegawa, S., Stryker, M. P. (1999) Brain-derived neurotrophic factor overexpression induces precocious critical period in mouse visual cortex. Journal of Neuroscience, 19 (22). ISSN 0270-6474

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URL: http://www.ncbi.nlm.nih.gov/pubmed/10559430

Abstract

Brain-derived neurotrophic factor (BDNF) is a candidate molecule for regulating activity-dependent synaptic plasticity on the grounds of its expression pattern in developing visual cortex and that of its receptor, trkB (Castr¿n et al., 1992; Bozzi et al., 1995; Schoups et al., 1995; Cabelli et al., 1996), as well as the modulation of these patterns by activity (Castr¿n et al., 1992; Bozzi et al., 1995; Schoups et al., 1995). Infusing trkB ligands or their neutralizing agents, the trkB-IgG fusion proteins, into visual cortex alters the development and plasticity of ocular dominance columns (Cabelli et al., 1995; Riddle et al., 1995; Galuske et al., 1996 ; Gillespie et al., 1996; Cabelli et al., 1997). To test further the physiological role of BDNF, we studied a transgenic mouse that expresses elevated levels of BDNF in primary visual cortex (V1) postnatally (Huang et al., 1999). We found that unlike the infusion experiments, excess BDNF expressed in mouse visual cortex did not block ocular dominance plasticity. Instead, single neurons in V1 of the BDNF transgenic mice were as susceptible to the effects of monocular deprivation (MD) as neurons in wild-type mice, but only during a precocious critical period. At a time when V1 in the wild-type mouse responded maximally to a 4 d MD with a reduction in its response to deprived eye visual stimulation, the transgenic mouse V1 had already passed the peak of its precocious critical period and no longer responded maximally. This finding suggests a role for BDNF in promoting the postnatal maturation of cortical circuitry.

Item Type: Paper
Uncontrolled Keywords: brain derived neurotrophic factor animal article evoked visual response metabolism mouse nerve cell plasticity physiology visual cortex Animals Brain-Derived Neurotrophic Factor Evoked Potentials Visual Mice Neuronal Plasticity
Subjects: organism description > animal > mammal > rodent > mouse
organs, tissues, organelles, cell types and functions > cell types and functions > cell functions > neural plasticity
neurobiology
organs, tissues, organelles, cell types and functions > tissues types and functions > visual cortex
CSHL Authors:
Communities: CSHL labs > Huang lab
Depositing User: CSHL Librarian
Date Deposited: 10 Apr 2012 18:03
Last Modified: 10 May 2013 19:09
PMCID: PMC2424259
URI: http://repository.cshl.edu/id/eprint/25796

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