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The hyaluronic acid binding region was prepared by clostripain digestion of chondroitin sulfate proteoglycan isolated from the Swarm rat chondrosarcoma, and biotinylated in the presence of associated hyaluronic acid and link protein. After removal of hyaluronic acid by gel filtration in 4 M guanidine HCl, the biotinylated binding region-link protein complex was used as a specific histochemical probe in conjunction with avidin-peroxidase. Its utility was initially evaluated by comparison with Alcian blue staining of the axial region of 2 to 5 day chick embryos, where staining was seen in the dorsolateral area between the neural tube and the ectoderm, in the perichordal mesenchyme, and in developing limb buds. Light and electron microscopic studies of early postnatal rat cerebellum indicate that hyaluronic acid is primarily localized in the extracellular space of immature brain. Staining specificity was demonstrated by the ability of hyaluronic acid oligosaccharides of appropriate size to block the staining reaction, and by the absence of staining after treatment of tissue sections with protease-free Streptomyces hyaluronidase, which degrades only this glycosaminoglycan.

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

The hyaluronic acid binding region as a specific probe for the localization of hyaluronic acid in tissue sections. Application to chick embryo and rat brain.