Ultrastructure of cell surface coat (glycocalyx) in rat urinary bladder epithelium.

Earlier statements to the contrary, the present study demonstrates the presence of a cell surface coat (glycocalyx) on the luminal plasma membrane of the superficial transitional epithelial cells lining the urinary bladder of male Buffalo rats. This coat was demonstrated with ruthenium red, an electron dense stain, which revealed a surface layer, 60-80 A thick, separated from the outer leaflet of the plasma membrane by an electron lucent layer, approximately 30 A thick. The structure of the glycocalyx was not affected by 12 weeks of treatment with dibutylnitrosamine, a known bladder carcinogen.