Abstract
Dipyridamole (DPD) has been shown to inhibit the motility of cells in culture. We have tested the effect of DPD on the invasion in confronting organ culture of the following malignant cell lines: mouse MO4 cells; rat NBT II bladder tumor cells; human SA4 glioblastoma cells; mouse LLC H61 lung carcinoma cells; and mouse F87 C1.6T2 melanoma x lymphocyte hybrid cells. At concentrations of 20 micrograms/ml or higher, DPD inhibited the invasion of all cell types into embryonic chick heart. In serum-free culture medium the anti-invasive concentration of DPD was about ten times lower. Anti-invasive concentrations of DPD also inhibited proliferation of the malignant cells. Both inhibition of invasion and of proliferation were reversible.
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