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Journal of Cell Science, Vol 99, Issue 3 641-649, Copyright © 1991 by Company of Biologists

JOURNAL ARTICLES

The synthesis of type X collagen by bovine and human growth-plate chondrocytes

A Marriott, S Ayad and ME Grant
Department of Biochemistry and Molecular Biology, School of Biological Sciences, University of Manchester, UK.

Chondrocytes were isolated from bovine growth-plate cartilage and cultured within type I collagen gels. A major collagen with chains of Mr 59,000, decreasing to 47,000 on pepsinization, was synthesized and identified as type X collagen. This collagen was cleaved at two sites by mammalian collagenase, resulting in a major triple-helical fragment with chains of Mr 32,000. The species of Mr 59,000, 47,000 and 32,000 were not detected by SDS-polyacrylamide gel electrophoresis before reduction, indicating the presence of disulphide bonds within the triple helix. In contrast, similar biosynthetic studies with human growth-plate cartilage in organ culture, indicated that human type X collagen does not contain disulphide bonds. A polyclonal antiserum was raised to bovine type X collagen and used in immunolocalization studies to provide direct evidence for the association of type X collagen with the hypertrophic chondrocytes in both bovine and human growth plates during development.


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© The Company of Biologists Ltd 1991