A New Cat Fos Antibody to Localize the Immediate Early Gene c-fos in Mammalian Visual Cortex after Sensory StimulationEstel Van der Guchta,c, Erik Vandenbusscheb, Guy A. Orbanc, Frans Vandesandea, and Lutgarde Arckensa,ca Laboratory of Neuroendocrinology and Immunological Biotechnology, Katholieke Universiteit Leuven b Laboratory of Neuropsychology, Medical School, Katholieke Universiteit Leuven, Leuven, Belgium c Laboratorium voor Neuro- en Psychofysiologie, Medical School, Katholieke Universiteit Leuven, Leuven, Belgium Correspondence to: Lutgarde Arckens, Laboratory of Neuroendocrinology and Immunological Biotechnology, Katholieke Uni-versiteit Leuven, Naamsestr. 59, B-3000 Leuven, Belgium. E-mail: Lut.Arckens@bio.kuleuven.ac.be We developed a novel antibody against cat Fos by immunizing rabbits with a 26-amino-acid peptide. Immunocytochemistry on visual cortex of cats undergoing different visual manipulations was applied to test the reliability and the efficacy of this antiserum. One hour of light stimulation after an overnight dark adaptation resulted in strongly induced Fos expression in supra- and infragranular layers of cat primary visual cortex. Short-term monocular deprivation changed the Fos expression profile into a columnar immu-nostaining related to ocular dominance columns. Fos expression has also been analyzed in cats in which visual input was confined to the right hemisphere by sectioning the left optic tract and the corpus callosum. In the right hemisphere, visual stimulation elicited Fos induction, whereas in the contralateral hemisphere a very low Fos signal was observed. The specificity of this newly synthesized antibody was confirmed by Western blotting. To further establish the applicability of this Fos antiserum, we performed immunostaining on monkey and rat visual cortex. This new cat Fos antibody appears to be excellent for study of Fos expression as a marker for mapping neuronal activity in mammalian brain. (J Histochem Cytochem 48:671684, 2000) Key Words: immediate early gene (IEG), antibody production, Western blotting, immunocytochemistry, Fos expression, visual cortex, cat, monkey
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