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GABA immunoreactivity in the nucleus isthmo-opticus of the centrifugal visual system in the pigeon: A light and electron microscopic study

Published online by Cambridge University Press:  02 June 2009

Dom Miceli,
Jacques Repérant,
Jean-Paul Rio and
Monique Medina
Dom Miceli
Affiliation:
Laboratoire de Neuropsychologie Expérimental et Comparée, Université du Québec, Trois-Rivières, Canada
Jacques Repérant
Affiliation:
Laboratoire de Neuropsychologie Expérimental et Comparée, Université du Québec, Trois-Rivières, CanadaINSERM U–106, Hoôpital de la Salpétrière, Paris
Jean-Paul Rio
Affiliation:
INSERM U–106, Hoôpital de la Salpétrière, Paris
Monique Medina
Affiliation:
Laboratoire d'Anatomie Comparée, M.N.H.N., Paris, France
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Abstract

The present study examined GABA immunoreactivity within the retinopetal nucleus isthmo-opticus (NIO) of the pigeon centrifugal visual system (CVS) using light- (immunohistofluorescence, peroxidase anti-peroxidase: PAP) and electron- (postembedding GABA immunogold) microscopic techniques. In some double-labeling experiments, the retrograde transport of the fluorescent dye rhodamine β−isothiocyanate (RITC) after its intraocular injection was combined with GABA immunohistofluorescence. GABA-immunoreactive (-ir) somata were demonstrated within the neuropilar zone of the NIO adjacent to the centrifugal cell laminae whereas the centrifugal neurons were always immunonegative. A quantitative ultrastructural analysis was performed which distinguished five categories of axon terminal profiles (P1–5) on the basis of various cytological criteria: type of synaptic contact (symmetrical or asymmetrical); shape, size, and density of synaptic vesicles as well as the immunolabeling (positive or negative), size of profile and appearance of hyaloplasm. Numerous GABA-ir afferents to centrifugal neurons via axon terminal types P2a, P2c, and P3 were observed which comprised 47.1% of the total input. Moreover, the data suggest that some of the P2a terminals, which make up 26.4% of the input, stem from the intrinsic GABA-ir interneurons, whereas the latter receive P1, P3, but also P2 terminal input, indicating that interneurons may contact other interneurons via type P2a axon terminals. The results also suggest that the GABA-ir P3 or the immunonegative P1b and P5 axon terminals are of extrinsic origin arising from cells in the optic tectum whereas the P2c and P4 axon terminals are associated with extra-tectal input to the NIO. The GABAergic innervation of centrifugal neurons within the NIO may be the basis for the demonstrated facilitatory effect of the centrifugal output upon ganglion cell responses. This is relevant to hypotheses regarding CVS involvement in attentional mechanisms through selective enhancement of retinal sensitivity depending on the location of meaningful or novel stimuli.

Keywords

Centrifugal visual systemNucleus isthmo-opticusPigeonGABA immunoreactivityLight and electron microscopy

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Type
Research Articles
Information
Visual Neuroscience , Volume 12 , Issue 3 , May 1995, pp. 425 - 441
Copyright
Copyright © Cambridge University Press 1995

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