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Neonatal monocular enucleation and the geniculo-cortical system in the golden hamster: Shrinkage in dorsal lateral geniculate nucleus and area 17 and the effects on relay cell size and number

Published online by Cambridge University Press:  02 June 2009

A.J. Trevelyan  and
I.D. Thompson
A.J. Trevelyan
Affiliation:
University Laboratory of Physiology, Parks Road, Oxford, OX1 3PT, UK.
I.D. Thompson
Affiliation:
University Laboratory of Physiology, Parks Road, Oxford, OX1 3PT, UK.
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Abstract

We have examined the effects of neonatal monocular enucleation on the volume of the dorsal lateral geniculate nucleus (dLGN), the area of area 17, and the size and numbers of geniculate relay neurons identified by retrograde transport of HRP from cortex. Compared to values for normal animals, the only significant change contralateral to the remaining eye was an increase in relay cell radius. The effects ipsilateral to the remaining eye were more widespread: we found significant reductions in the volume of the dLGN (27% reduction), the area of striate cortex (22%), and the number (16%) and average soma radius (6%) of geniculate relay neurons. The relay neurons were also more densely packed, suggesting that other geniculate cell types were affected similarly, although this was not explicitly examined. These changes were not uniform throughout the nucleus, and as such, reflected the changes in retinal input. The greatest reduction in cell size occurred in the region of the ipsilateral dLGN receiving the most sparse retinal input subsequent to enucleation. Nor was the shrinkage of the dLGN uniform, being most apparent in the coronal plane especially along the axis orthogonal to the pia; there appeared to be little change in the anteroposterior extent. Shrinkage in area 17 ipsilateral to the remaining eye was the same (about 22%) whether it was defined by myelin staining or transneuronal transport of WGA-HRP. These results show that the transneuronal changes seen in the organization of visual cortex after early monocular enucleation in rodents are associated with only a moderate loss of geniculate relay cells.

Keywords

Neuronal deathDeafferentationVisual systemDevelopmentTransneuronal plasticity
Type
Research Articles
Information
Visual Neuroscience , Volume 12 , Issue 5 , September 1995 , pp. 971 - 983
Copyright
Copyright © Cambridge University Press 1995

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