Characterisation of proteoglycans and their catabolic products in tendon and explant cultures of tendon

Matrix Biology : Journal of the International Society for Matrix Biology
Tom SamiricC J Handley

Abstract

Tendons are collagenous tissues made of mainly Type I collagen and it has been shown that the major proteoglycans of tendons are decorin and versican. Little is still known about the catabolism of these proteoglycans in tendon. Therefore, the aim of the study was to characterise the proteoglycans including their catabolic products present in uncultured bovine tendon and in the explant cultures of tendon. In this study, the proteoglycans were extracted from the tensile region of deep flexor tendon and isolated by ion-exchange chromatography and after deglycosylation analysed by SDS-polyacrylamide electrophoresis, Western blotting and amino-terminal amino acid sequence analysis. Based on amino acid sequence analysis, approximately 80% of the total proteoglycan core proteins in fresh tendon was decorin. Other species that were detected were biglycan and the large proteoglycans versican (splice variants V(0) and/or V(1)) and aggrecan. Approximately 35% of decorin present in the matrix showed carboxyl-terminal proteolytic processing at a number of specific sites. The analysis of small proteoglycans lost to the medium of tendon explants showed the presence of biglycan and decorin with the intact core protein as well as decorin fragme...Continue Reading

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