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Department of Medicine, University of Melbourne, Repatriation General Hospital, Heidelberg, 3081 [N. C. P., V. P. M., T. J. M.], and Department of Anatomy, University of Melbourne, Parkville, 3052 [D. A., G. R.], Victoria Australia
The ultrastructural and biochemical properties of four clonal osteogenic sarcoma lines, UMR 104, 105, 106, and 108, have been compared with uncloned osteogenic sarcoma cells and normal osteoblast-rich cells derived from newborn rat calvaria. High alkaline phosphatase activity and activation of adenylate cyclase by parathyroid hormone were used as biochemical markers of osteoblastic cells. Cloning enriched both of these parameters above those of the parent tumor and far higher than that seen in normal cells, suggesting enrichment of the osteoblast phenotype. Both of these properties have been retained through many passages in culture. Morphologically, the clonal lines have also retained the "blast"-like appearance of the uncloned osteogenic sarcoma cells and consist mainly of flat, relatively featureless cells. Many cells with mitotic figures were observed, indicating continuous cell division taking place in the malignant cells. Each clonal line gave rise to characteristic tumors when reinjected into rats. It is concluded that the clonal osteogenic sarcoma lines are highly differentiated tumor lines which have conserved the differentiated properties of the mature osteoblast, making them a suitable model for the study of the effects of hormones on the growth of a differentiated tumor, as well as for the study of hormonal regulation of the osteoblast.
1 Supported by grants from the Australian Government Department of Veterans' Affairs, the National Health and Medical Research Council of Australia, and the Children's Leukaemia and Cancer Foundation. The clonal lines can be obtained by qualified investigators from the American Type Culture Collection.
2 To whom requests for reprints should be addressed.
Received 12/30/82. Accepted 6/ 7/83.
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