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The changes in rates of hydroxyproline formation and biosynthesis of types-I and -III collagen during bone matrix-induced sequential differentiation of cartilage, bone and bone marrow in rat were investigated. Biosynthesis of types-I and -III collagen at different stages of this sequence was studied by labelling in vivo and in vitro with [2,3-3H]proline. Pepsin-solubilized collagens were separated by sodium dodecyl sulphate/polyacrylamide-slab-gel electrophoresis. The results revealed that maximal amounts of type-III collagen were synthesized on day 3 during mesenchymal-cell proliferation. Thereafter, there was a gradual decline in type-III collagen synthesis. On days 9--20 during bone formation predominantly type-I collagen was synthesized. Similar results were obtained by the use of labelling techniques both in vivo and in vitro.

Changes in synthesis of types-I and -III collagen during matrix-induced endochondral bone differentiation in rat