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pubmed-article:3349462pubmed:abstractTextEstramustine (EM) is a conjugate of estradiol and nor-nitrogen mustard (nor-HN2), which is effective in the treatment of prostate cancer. We have compared the effect of EM with that of the known microtubule inhibitor vinblastine (VLB) on the following functions of malignant MO4 mouse cells and of DU-145 human prostate cancer cells in vitro: directional migration, invasion; and the organization and the assembly/disassembly equilibrium of microtubule complexes. The circular area covered by cells migrating from an aggregate explanted on a solid substrate was taken as an index of directional migration. Invasion was studied through confrontation of MO4 or DU-145 cells with fragments of embryonic chick heart in organ culture. Microtubules were investigated immunocytochemically and through immunodetection on protein blots. VLB and EM inhibited directional migration and invasion of MO4 and DU-145 cells in a dose-dependent manner; equimolar combinations of estradiol plus nor-nitrogen mustard did not mimic these effects. At anti-invasive concentrations VLB led to partial disassembly of microtubule complexes, whereas EM resulted in an abnormal pattern of microtubule complexes without alteration of the overall assembly/disassembly equilibrium. Combined treatment with VLB and EM resulted in an enhanced VLB effect, namely complete disassembly. In all tests DU-145 cells were more sensitive to both VLB and EM than were MO4 cells, and the effects were less reversible. The present experiments showed that EM shares an anti-invasive activity with other microtubule inhibitors.lld:pubmed
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pubmed-article:3349462pubmed:articleTitleAntiinvasive activity of estramustine on malignant MO4 mouse cells and on DU-145 human prostate carcinoma cells in vitro.lld:pubmed
pubmed-article:3349462pubmed:affiliationDepartment of Radiotherapy and Nuclear Medicine, University Hospital, Ghent, Belgium.lld:pubmed
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