Differential extraction of proteoglycans from cartilage tissue matrix compartments in isotonic buffer salt solutions and commercial tissue-culture media.

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Abstract
Small tissue blocks of native rat growth plate cartilage were incubated for short periods in one of several generally used isotonic buffer salt solutions or commercial tissue-culture media. The total percentage (approximately 12) of [35S]-labeled proteoglycans (PG) extracted from cartilage matrix under these conditions was not significantly influenced by either the chemical composition of the medium or the presence of a protease inhibitor. Morphological examination of incubated tissue after fixation in the presence of ruthenium hexamine trichloride (RHT) (included to preserve PG in situ) revealed, however, that the PG staining profiles across cartilage matrix varied with the composition of the incubation medium used. The various susceptibilities exhibited by PG within the different matrix compartments to selective extraction was estimated semi-quantitatively. The observed effects may prove useful in extracting these molecules differentially from cartilage matrix compartments.

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