Abstract
A kidney epithelial cell growth inhibitor, isolated from BSC-1 cell-conditioned medium, has been found to be active on certain lung and mammary gland cell lines in culture. The most responsive cell observed thus far is the CCL64 mink lung cell line. With CCL64 cells, 60% inhibition of [ 3H]thymidine incorporation is observed at a 0.1 nanogram/ml concentration of the growth inhibitor, and approximately 95% inhibition at 1 nanogram/ml. A human mammary tumor cell line, Hs578T, shows 75% inhibition of [ 3H]thymidine incorporation, in cell culture. Preliminary studies indicate that injection of the kidney epithelial cell growth inhibitor in vivo into human mammary carcinomas growing in nude mice inhibits [ 3H]thymidine incorporation in the tumors.
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