title: Distribution of calcium binding proteins in visual and auditory cortices of hamsters.
abstract: The morphology and distribution of neurons immunoreactive (ir) to parvalbumin (PV), calretinin (CR) and calbindin (CB) were studied in the primary visual (V1) and auditory (A1) cortices of hamsters. Cortical cell populations were labelled immunohistochemically using a glucose oxidase-diaminobenzidine-nickel combined revelation method. Quantitative analysis revealed significant differences between V1 and A1 in the density and distribution of their neuronal population. CBir cells exhibited several typologies in both cortical regions. Most cells were multipolar even though many of them had bitufted or bipolar morphologies. These cells were distributed in layers II/III and in layer V of both A1 and V1, but were more numerous in layer V of V1. CRir cells were of the fusiform type with long bipolar dendritic arbours. These were similarly distributed in both cortices with a peak in superficial layers II/III. PVir cells were also found in both cortices and had round or oval-shaped somata with multipolar processes. They were mostly located in layer V for V1 and in layers III/IV for A1. Visual and auditory primary cortices can thus be differentiated on the basis of their immunoreactivity to specific calcium binding proteins.
authors.affiliation: School of Optometry, University of Montreal, CP6128 Succ. Centre-Ville, Montreal, Quebec, H3C 3J7, Canada.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Desgent
authors.forename: Denis
authors.initials: D
authors.lastname: Boire
authors.forename: Maurice
authors.initials: M
authors.lastname: Ptito
mesh_terms: D000818:Animals; D001303:Auditory Cortex / Q000033:anatomy & histology / Q000378:metabolism*; D064032:Calbindin 2; D064026:Calbindins; D002135:Calcium-Binding Proteins / Q000378:metabolism*; D048430:Cell Shape / Q000502:physiology; D006224:Cricetinae; D003712:Dendrites / Q000648:ultrastructure; D005260:Female; D007150:Immunohistochemistry / Q000379:methods; D007395:Interneurons / Q000166:cytology / Q000378:metabolism*; D008647:Mesocricetus; D010320:Parvalbumins / Q000378:metabolism; D064030:S100 Calcium Binding Protein G / Q000378:metabolism; D014793:Visual Cortex / Q000033:anatomy & histology / Q000378:metabolism*; D005680:gamma-Aminobutyric Acid / Q000378:metabolism*
chemical_list: D064032:Calbindin 2; D064026:Calbindins; D002135:Calcium-Binding Proteins; D010320:Parvalbumins; D064030:S100 Calcium Binding Protein G; D005680:gamma-Aminobutyric Acid