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. 1987 Nov;84(22):8169–8173. doi: 10.1073/pnas.84.22.8169

Blood-brain barrier protein recognized by monoclonal antibody.

N H Sternberger 1, L A Sternberger 1
PMCID: PMC299500  PMID: 3500474

Abstract

An IgG1 mouse monoclonal antibody produced in response to immunization with rat brain homogenate reacted with endothelial cells in the central and peripheral nervous system. Because antibody reactivity was associated with endothelia that have a selective permeability barrier, the antibody was called anti-endothelial-barrier antigen (anti-EBA). Paraffin sections of Bouins'-fixed rat tissue were used for initial screening and subsequent characterization of antibody reactivity. The antibody was generally unreactive with endothelial cells in other organs and with nonendothelial cells in or outside of the nervous system. Antibody binding was greatly reduced or absent in endothelia of the area postrema and choroid plexus, sites known to possess fenestrated blood vessels. In developing rat brain, anti-EBA binding to some microvessels was seen at 3 days postnatally. Anti-EBA reactivity outside the nervous system occurred in spleen and skin. Patchy reaction with portions of some spleen blood vessels and binding to some cells in the spleen were observed. In the skin, small cells, tentatively identified as Langerhans cells, which participate in Ia presentation, were stained. On immunoblots of rat brain microvessel preparations electrophoresed in Na-DodSO4/polyacrylamide gels, anti-EBA reacted with a protein triplet of Mr 30,000, 25,000, and 23,500 components.

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