Environmental estrogen stimulation of growth and estrogen receptor-function in preneoplastic and cancerous human breast cell lines

被引:89
作者
Shekhar, PVM [1 ]
Werdell, J [1 ]
Basrur, VS [1 ]
机构
[1] WAYNE STATE UNIV, SCH MED, DEPT PATHOL, DETROIT, MI 48201 USA
来源
JNCI-JOURNAL OF THE NATIONAL CANCER INSTITUTE | 1997年 / 89卷 / 23期
关键词
D O I
10.1093/jnci/89.23.1774
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Background: DDT and polychlorinated biphenyls (PCBs), which are widespread in the ecosystem, can mimic estrogen-mediated cell activities, Thus, they can potentially interfere with many physiologic processes, We compared the effects of organochlorines belonging to the DDT and PCB families, alone and in combination, for their ability to influence the estrogen receptor-mediated activities in preneoplastic breast epithelial cells and breast cancer cells, Methods: Multiple assay systems requiring functional estrogen receptor were employed to test estrogen-like activity of organochlorine ligands, Two-sided statistical tests were used to compare the data, Results: p,p'-DDT, the predominant form of DDT in the environment, is a more potent estrogen than o,p'-DDT (P<.001), although it is less effective than o,p'-DDT in inhibiting the binding of estradiol (natural estrogen) to estrogen receptor. Among the PCBs, Heptachlor is estrogenic (in transient reporter assays; P less than or equal to.001), whereas Aroclor 1221 and Aroclor 1254, both individually and in combination, are only weakly estrogenic, Conclusion: p,p'-DDT is the most effective organochlorine in regulating estrogen receptor-mediated cellular responses, In estrogen receptor-positive breast cancer cells, p,p'-DDT evokes responses by itself and enhances the responses in collaboration with estradiol or o,p'-DDT.
引用
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页码:1774 / 1782
页数:9
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