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The synovial lining of joint capsules is important because it controls the flow of fluid into and out of the joint cavity. Physiological studies have shown that the glycosaminoglycans, particularly hyaluronan, have an important role in the control of fluid flow. The distribution of the glycosaminoglycans and proteoglycans in the synovium and subsynovium of rabbits (approximately 12 weeks old) was, therefore, determined immunohistochemically. Hyaluronan, chondroitin-4- and chondroitin-6-sulphates and keratan sulphate are present in the synovium and subsynovium; chondroitin-4-sulphate is at higher concentrations than chondroitin-6-sulphate. The core proteins of the chondroitin sulphate proteoglycans, biglycan and decorin, and of the keratan sulphate proteoglycan, fibromodulin, are also present. To date, fibromodulin has not been located in other synovial linings, and its presence corroborates that of keratan sulphate. |
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