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Demonstration of anionic sites on the luminal and abluminal fronts of endothelial cells with poly-L-lysine-gold complex

AW Vorbrodt

New York State Office of Mental Retardation and Developmental Disabilities, Institute for Basic Research in Developmental Disabilities, Staten Island 10314.

An attempt was made to demonstrate the anionic sites on the endothelial cell (EC) surfaces of mouse brain micro-blood vessels (MBVs) after embedding of tissue samples in hydrophilic media: Lowicryl K4M, LR White, and Polyamph-10. As a cationic probe, poly-L-lysine-gold complex (PLG), prepared according to the procedure of Skutelsky and Roth (J Histochem Cytochem 34:693, 1986), was used. In ultra-thin sections of brain samples embedded in Lowicryl K4M and LR White, the anionic sites were demonstrated in the entire cross-section of the vessel wall. After embedding in Polyamph-10, however, the anionic sites could not be detected. Brain capillaries, representing blood-brain barrier type MBVs, showed polar distribution of anionic sites, evidenced by more intense labeling of luminal than of abluminal plasma membrane of the EC. Some differences in labeling of ECs and of basement membrane in arterioles and venules were also noted. The use of cationic gold and the ultra-thin sections of tissue samples embedded in hydrophilic media (Lowicryl K4M and LR White) seems to be a promising new method for detection of anionic constituents located on both luminal and abluminal surfaces of the EC, in the basement membrane, and in other components of the vessel wall.

Volume 35, Issue 11, pp. 1261-1266, 11/01/1987
Copyright © 1987 by The Histochemical Society


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