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. 1992 Apr;65(4):578–582. doi: 10.1038/bjc.1992.117

Hormone control of total plasminogen activator activity is specific to malignant DMBA-induced rat mammary tumours.

K Inada 1, J Yamashita 1, S Matsuo 1, Y Nakashima 1, S Yamashita 1, M Ogawa 1
PMCID: PMC1977557  PMID: 1562466

Abstract

Hormonal regulation of plasminogen activator expression in 7,12-dimethylbenz[a]anthracene (DMBA)--induced rat mammary carcinomas was studied both in vivo and in vitro and was compared to that in DMBA-mammary dysplasia induced in neonatally androgenised rats. The plasminogen activator activity in DMBA-mammary carcinomas, but not in DMBA-mammary dysplasia, was regulated by oestrogen. This suggests that expression of this enzyme is hormonally regulated in carcinoma cells. Furthermore, in two of six DMBA-mammary carcinoma groups classified in terms of hormonal treatment, plasminogen activator activity was not under the control of oestrogen. Thus, the present results suggest that at the time of carcinogenesis, the hormonal milieu determines the hormone sensitivities of the malignant cells.

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Selected References

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