Abstract
Localization of organ-specific brain antigens in the central nervous system of the rat has been studied by means of indirect immunofluorescence. Rabbit antiserum against homogenate of rat brain, previously absorbed with normal serum and homogenates of rat organs (kidney, liver, spleen), reacted with the water-soluble antigens of rat brain prepared by extraction with phosphate buffer (pH 7.3) and ultracentrifugation at 50 000 X g to give one band in the immunodiffusion test and 2--3 precipitation arcs in immunoelectrophoresis. There was also a positive reaction with peripheral nerve. The antigen was detectable in all regions of the CNS. Cells with distinct cytoplasmic immunofluorescence were most frequently observed in cerebellar white matter, pons, cerebellar pedunculi, longitudinal tracts of the brain stem. Positive immunofluorecence reaction has appeared in the outer plexiform layer and granular layer of the retina, satelite cells of the spinal root ganglia and Schwann cells. A similar reaction was observed in human, mouse and guinea pig brain slices. Both the morphological and immunochemical reactions are indicative of glial localization of this antigen.
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