Summary
The effect of digestion with keratanase (Pseudomonas sp.) on the Alcian Blue (AB) pH 1.0, pH 2.5, Aldehyde Fuchsin, high iron diamine, low iron diamine and dialysed iron-ferrocyanide reactions has been tested in the costal and ear cartilage tissues of the rabbit and corneal tissues of the rat and rabbit. The effect of digestion with chondroitinases ABC and AC on the same reactions was examined in the same tissues for comparison. Digestion with keratanase diminished the intensity of all the reactions in the cartilage tissues to a variable extent; however, the diminutions in intensity of the reactions appeared to be less marked as compared with those following digestion with two chondroitinases. In the corneal stroma, all the reactions were markedly reduced in intensity following digestion with keratanase. In contrast, these reactions were only slightly or moderately diminished in intensity by digestion with the two chondroitinases. As glycosaminoglycans are known to be present in cartilage and corneal tissues and the substrate specificities of the three enzymes used are now well established, the present results are consistent with the concept that keratanase specifically degrades and releases keratan sulphates involved in the tissues.
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Yamada, K., Fujita, Y. & Shimizu, S. The effect of digestion with keratanase (Pseudomonas sp.) on certain histochemical reactions for glycosaminoglycans in cartilaginous and corneal tissues. Histochem J 14, 897–910 (1982). https://doi.org/10.1007/BF01005232
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DOI: https://doi.org/10.1007/BF01005232