Quantitative analysis of glycosaminoglycans in urothelium and bladder wall of calf.

Glycosaminoglycans (GAG) were described by histochemical staining procedures in the normal urothelium of the urinary bladder; they are supposed to be involved in the antibacterial defense mechanism. Our quantitative analysis, however, demonstrated only heparan sulfate in the normal calf urothelium (less than 600 nmol/Gm d.wt.); only trace amounts of other GAG were to be analyzed. High concentrations of GAG were found in the submucosa and muscle layers as to be expected in mesoderm originating tissues. According to these results there were no GAG with the exception of heparan sulfate at the surface of the normal urothelium; therefore, glycoproteins detected in mumol/Gm d.wt. ranges are more likely to be involved in the antibacterial defense mechanism.