Isolation of bovine type X collagen and immunolocalization in growth-plate cartilage

T. Kirsch, K. Von der Mark

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Type X collagen was extracted with 1 M-NaCl and 10 mM-dithiothreitol at neutral pH from fetal-bovine growth cartilage and purified to homogeneity by using f.p.l.c. gel filtration on a Superose 12 column, followed by ion-exchange chromatography on a Mono Q column. The purified protein migrates in SDS/polyacrylamide gels with an apparent M(r) of 58 000 under reducing conditions and as high-M(r) oligomer in its unreduced form. The amino acid composition is similar to the published composition of chick type X collagen. Pepsin digestion at 4 °C decreased the M(r) of the monomer to 43 000; purified bacterial collagenase digests most of the molecule, leaving a non-collagenous domain of apparent M(r) 15 000, which probably represents the C-terminal globular domain. The IgG fraction from a rabbit antiserum raised against purified bovine type X collagen was specific for this collagen by the criteria of e.l.i.s.a. and immunoblotting after immunoabsorption with collagen types I, II, IX and XI. Immunofluorescence localization of type X collagen in sections of fetal-bovine and human cartilage was possible after acetone fixation of sections and hyaluronidase treatment. Type X collagen was restricted to the zone of hypertrophic and calcified cartilage inside the bone spicules of the growth plate.

    Original languageEnglish (US)
    Pages (from-to)453-459
    Number of pages7
    JournalBiochemical Journal
    Volume265
    Issue number2
    DOIs
    StatePublished - 1990

    ASJC Scopus subject areas

    • Biochemistry
    • Molecular Biology
    • Cell Biology

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