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• W2064631960 abstract "Luminal and abluminal membrane vesicles derived from bovine brain endothelial cells, the site of the blood-brain barrier, were fractionated in a discontinuous Ficoll gradient. A mathematical analysis was developed to determine the membrane distribution of membrane marker enzyme activities as well as the ratio of luminal to abluminal membrane in each fraction of the gradient. The results of this analysis indicate that g-glutamyl transpeptidase and amino acid transport system A are located on the luminal and abluminal membranes, respectively. Conversely, 5′-nucleotidase and alkaline phosphatase activities are evenly distributed between both membranes. Although Nag/K+-ATPase activity is primarily located on the abluminal membrane, approximately 25% of the activity is of luminal origin. Na+/K+-ATPase activities associated with each membrane showed different ouabain sensitivities, suggesting that different isoenzymes are located in luminal and abluminal membranes. The analytical procedure used in this study provides a quantitative means to determine the distribution of marker enzymes and transport proteins in partially purified membrane vesicle populations. Luminal and abluminal membrane vesicles derived from bovine brain endothelial cells, the site of the blood-brain barrier, were fractionated in a discontinuous Ficoll gradient. A mathematical analysis was developed to determine the membrane distribution of membrane marker enzyme activities as well as the ratio of luminal to abluminal membrane in each fraction of the gradient. The results of this analysis indicate that g-glutamyl transpeptidase and amino acid transport system A are located on the luminal and abluminal membranes, respectively. Conversely, 5′-nucleotidase and alkaline phosphatase activities are evenly distributed between both membranes. Although Nag/K+-ATPase activity is primarily located on the abluminal membrane, approximately 25% of the activity is of luminal origin. Na+/K+-ATPase activities associated with each membrane showed different ouabain sensitivities, suggesting that different isoenzymes are located in luminal and abluminal membranes. The analytical procedure used in this study provides a quantitative means to determine the distribution of marker enzymes and transport proteins in partially purified membrane vesicle populations." @default.
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• W2064631960 date "1995-06-01" @default.
• W2064631960 modified "2023-09-30" @default.
• W2064631960 title "Biochemical Discrimination between Luminal and Abluminal Enzyme and Transport Activities of the Blood-Brain Barrier" @default.
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• W2064631960 doi "https://doi.org/10.1074/jbc.270.25.14907" @default.
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