Summary
When estrogen is present in culture medium, enzyme-dissociated cells from estrogen-induced primary renal tumors in Syrian hamsters and from 1st to 4th serially transplanted carcinomas in monolayer culture contain progesterone receptor levels that are similar and comparable to those in tumors in vivo (i.e., 2 pmol/3×106 cells). Despite the similarity of receptor levels in cultured cells isolated from primary and transplanted tumors, the ability of cells to be maintained in culture differs considerably from one tumor stage to another. When cultured as monolayers in plastic flasks, isolated cells from primary tumors exhibit a marked decline in cell number after 4 to 6 d in culture. On the other hand, monolayer-cultured cells from first and second transplantation tumors remain essentially constant in cell number over a 2 wk culture period and cells from third transplantation tumors undergo a two- to threefold increase in cell number during 2 wk in culture.
When primary tumor cells are cultured in collagen gels, the decline in cell number over a 2 wk culture period is prevented and progesterone receptor levels remain elevated. Cells cultured from first transplantation tumors exhibit a delayed decline in cell number beginning after 2 wk in monolayer culture. The decline in cell number in monolayer culture, like that for cells from primary tumors, can be prevented by culturing cells from first transplantation tumors in collagen gels. Neither cells from primary nor first transplantation tumors exhibit significant increases in cell number in collagen gels. Increasing the serum concentration of growth medium to 30% does not stimulate growth of cells under these conditions. Cells isolated from fourth transplantation tumors undergo a fourfold increase in cell number over a 1 month culture period whether cells are cultured as monolayers or in collagen gels.
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This investigation was supported by Grant CA 22008 awarded by the National Cancer Institute, Department of Health, Education and Welfare, and by institutional research funds from Marquette University.
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Talley, D.J., Roy, W.A. & Li, J.J. Behavior of primary and serially transplanted estrogen-dependent renal carcinoma cells in monolayer and in collagen gel culture. In Vitro Cell.Dev.Biol.-Plant 18, 149–156 (1982). https://doi.org/10.1007/BF02796407
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DOI: https://doi.org/10.1007/BF02796407