Abstract
Bone marrow fibroblasts from normal and leukemic patients were used to investigate the relationship between serial subcultivation and changes in collagen synthesis. A regime was established to generate subcultures up to 35 cumulative population doublings (CPDs) in normal cells and to 9 CPDs in leukemic cells. In both types of cells, collagen synthesis decreased as subcultivation progressed. In normal cells, collagen synthesis was reduced to 10% of the original levels at 18 CPDs and in leukemic cells at 8 CPDs. In normal fibroblasts, collagen synthesis was more profoundly affected than overall protein synthesis by subcultivation. In acute lymphoblastic leukemia-derived fibroblasts, the decrease in collagen synthesis paralleled that of total protein.
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