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Pregnancy-dependent mammary tumors (PDMT) of GR/A mice and transplantable PDMT (TPDMT-4 line) in DDD mice, are exceptionally stable in hormone dependence, continue to grow until parturition and regress soon after delivery. In order to study the regression mechanism of PDMT and TPDMT-4, morphological and biochemical changes were examined in the tumors removed on day 18 (TPDMT-4) or day 20 (PDMT) of...
Of five autonomous sublines established independently from the transplantable hormone-dependent mouse mammary tumor, TPDMT-4, three but not two acquired metastatic potential. In in vitro culture using collagen gels, actinonin, an antibiotic protease inhibitor exerted a stronger growth-inhibiting effect on the metastatic than on the parent and non-metastatic tumors. Zymographic analysis demonstrated...
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