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J. Biol. Chem., Vol. 263, Issue 26, 12901-12908, Sep, 1988

Identification and characterization of estrogen-regulated RNAs in human breast cancer cells

FE May and BR Westley
University Department of Pathology, Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom.

Two cDNA libraries have been constructed with RNA prepared from the estrogen-responsive breast cancer cell lines, MCF7 and ZR 75. They were screened by differential hybridization for estrogen-regulated sequences. A total of 11 different RNAs were isolated from the MCF7 cell cDNA library and four from the ZR 75 cell cDNA library. Only two sequences were isolated from both libraries. The levels of the 13 different RNAs are induced between 2.5- and 100-fold by estrogen in MCF7 cells. The expression and regulation by estrogen of the RNAs was examined in eight different human tumor cell lines. The relative abundance of each RNA varied in the different cell lines. The expression of three RNAs (pNR-1, pNR-2, and pNR-25) was detected only in estrogen-responsive breast cancer cells. The sequences that were expressed in all eight cell lines were regulated by estrogen only in the three estrogen-responsive breast cancer cell lines. The response of the RNAs to other classes of steroids and to different concentrations of estrogen was characterized in more detail. The extent to which different concentrations of estradiol induced each RNA varied, but half- maximal induction of most of the RNAs occurred between 2 and 5 X 10(- 11) M. The time at which increased RNA levels were first detected following exposure to estradiol also varied. Estrogen increased the levels of some RNAs within 15 min, while for others there was a lag of 4 h.
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