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Large proteoglycan monomers and small dermatan sulfate proteoglycans were extracted from explants of bovine articular cartilage with increasing (0-4 M) concentrations of guanidinium chloride (GuHCl). The first extractions were followed by a second extraction with 4 M GuHCl. The amount of proteoglycans extracted in the first buffer depended on the GuHCl concentration. At low concentrations of GuHCl, a relatively high amount of small proteoglycans was obtained. Fifty percent of the small proteoglycans was extracted in buffer with 0.85 M GuHCl, while 2.0-2.2 M GuHCl was needed to extract half of the large proteoglycans. Immediately after synthesis, 35S-labeled large proteoglycans were extracted much easier (50% at 1.4 M GuHCl), and those extracted at low concentrations of GuHCl were less capable of aggregation with hyaluronic acid. After 7 days of 'chase' these differences between endogenous and 35S-labeled proteoglycans had disappeared.

Studies on the Extraction of Different Proteoglycan Populations in Bovine Articular Cartilage