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The respective requirements of collagen and MT1-MMP in the activation of MMP-2 by primary fibroblast cultures were explored further. Three-dimensional gels enriched in human collagen types I and III or composed of recombinant human type II or III collagen, caused increased MT1-MMP production (mRNA and protein) and induced MMP-2 activation. Only marginal induction was seen with dried monomeric collagen...
Collagen II was isolated from annulus fibrosus of human donors, and the degree of enzymatic glycosylation and the extent of nonenzymatic modification was determined as a function of age. While enzymatic glycosylation did not alter with age, the fluorescence as a measure of nonenzymatic modification increased, in particular in those fractions containing highly cross-linked collagen molecules. The age-dependent...
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