Abstract
The endothelial cells of mammalian brain capillaries, which form the anatomical basis of the blood-brain barrier, have been investigated by immunocytochemical methods to determine the distribution of the glucose-transport protein. A monoclonal antibody raised against the intact human erythrocyte glucose-transport protein and polyclonal antibodies raised against a synthetic peptide corresponding to the C-terminal sequence of the human erythrocyte glucose-transport protein were used for immunofluorescent staining of isolated human and bovine cerebral cortex microvessels. The pattern of fluorescence with both antibodies demonstrated the antigen to be distributed throughout the plasma membrane of the capillary endothelial cells. These results provide further evidence for the homology between the human erythrocyte and brain capillary glucose-transport protein, and confirm its abundance in brain capillaries.
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