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• W1989084471 abstract "Antiserum (MB007) was raised in rabbits to SDS-denatured cartilage link protein in order to develop an enzyme-linked immunosorbent assay (ELISA) to quantify link protein in cartilage extracts. The antibodies were characterized by using native and denatured link protein, either as the immobilised or the inhibiting antigen in the assay, and shown to bind more effectively to denatured link protein. At low concentrations, neither hyaluronate (0–30 μm/ml), proteoglycan (0–50 μg/ml) nor hyaluronate-binding region (0–3 μg/ml) competitively inhibited the link protein assay. However, at higher concentrations of proteoglycan (50 μg/ml−4 mg/ml) and hyaluronate-binding region (3–40 μg/ml) inhibition was observed. A more highly purified proteoglycan and a further purified hyaluronate-binding region preparation showed identical behaviour. The inhibition produced by proteoglycan and hyaluronate-binding region occured at approximately equivalent molar concentrations (assuming Mr of 106 and 7·104, respectively). These results suggest that a significant proportion of these polyclonal antibodies recognize an epitope common to link protein and hyaluronate-binding region. However, the possibility that these effects are due to contamination with covalently bound link protein cannot be excluded. Trypsinated aggregates (0–10 μg/ml) produced no inhibition in the link protein ELISA, but at higher concentrations the inhibition was approximately 2000-fold lower than might have been expected from the link protein concentration present. Thus, the accessibility and/or binding of the antibodies to link protein was substantially decreased, illustrating masking of the link protein antigenic sites, as found by A. Ratcliffe and T.E. Hardingham (Biochem. J. 213 (1983) 371–378). These studies indicate that link protein in tissue extracts may be quantified in the concentration range 30–200 ng/ml and in the presence of hyaluronate, proteoglycan and hyaluronate-binding region, provided that both the immobilised and extracted link proteins are denatured." @default.
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• W1989084471 date "1987-09-01" @default.
• W1989084471 modified "2023-09-27" @default.
• W1989084471 title "An enzyme-linked immunosorbent assay (ELISA) of denatured cartilage link protein" @default.
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• W1989084471 doi "https://doi.org/10.1016/0304-4165(87)90201-7" @default.
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