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Treatment of cartilage tissue with the cationic dye ruthenium hexammine trichloride (RHT) prior to fixation has been shown to prevent the detachment of chondrocytic plasmalemmata from the pericellular matrix and the aqueous extraction of proteoglycans during the subsequent fixation procedures. However, plasmalemmal rupture is prevented only by the simultaneous addition of RHT and the dialdehydic fixative glutaraldehyde. It is proposed that RHT forms an electrostatic cross-linkage between anionic components within the chondrocytic plasmalemma and proteoglycans of the pericellular matrix; experimental support for this hypothesis is presented. The precise nature of the plasmalemmal components with which RHT interacts is unknown. However, since their anionic properties are apparently lost following treatment with chondroitinase ABC, it seems likely that they represent chondroitin sulfate groups of membrane intercalated proteoglycans.

journal of histochemistry and cytochemistry/the journal of histochemistry and cytochemistry

Ruthenium hexammine trichloride (RHT)-mediated interaction between plasmalemmal components and pericellular matrix proteoglycans is responsible for the preservation of chondrocytic plasma membranes in situ during cartilage fixation.