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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The dermatan sulfate proteoglycans of bovine sclera and their relationship to those of articular cartilage. An immunological and biochemical study.

Dermatan sulfate proteoglycans were isolated from adult bovine sclera and adult bovine articular cartilage. Their immunological relationships were studied by enzyme-linked immunosorbent assays using polyclonal antibodies raised against the large and small dermatan sulfate proteoglycans from sclera and a polyclonal and monoclonal antibody directed against the small dermatan sulfate proteoglycans from cartilage. The small dermatan sulfate proteoglycans from sclera and cartilage displayed immunological cross-reactivity while there was no convincing evidence of shared epitope(s) with the larger dermatan sulfate proteoglycans, nor did these larger proteoglycans share any common epitopes with each other. A hyaluronic acid binding region was detected immunologically on the larger scleral dermatan sulfate proteoglycan but was absent from the larger dermatan sulfate proteoglycan of cartilage and both the small dermatan sulfate proteoglycans. These antibodies were used in immunofluorescence microscopy to localize the scleral proteoglycans and molecules containing these epitopes in the eye. The large scleral dermatan sulfate proteoglycan was restricted to sclera while molecules related to the small scleral and cartilage proteoglycans were found in the sclera, anterior uveal tract, iris, and cornea. Amino acid sequencing of the amino-terminal regions of the core proteins of the small dermatan sulfate proteoglycans from sclera and articular cartilage showed that all the first 14 amino acids analyzed were identical and the same as reported earlier for the small bovine skin and tendon dermatan sulfate proteoglycans. These studies demonstrate that the larger dermatan sulfate proteoglycans of sclera and cartilage are chemically unrelated to each other and to the smaller dermatan sulfate proteoglycans isolated from these tissues. The latter have closely related core proteins and probably represent a molecule with a widespread distribution in which the degree of epimerization of glucuronic acid and iduronic acid varies between tissues.[1]


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