THE ESTABLISHMENT OF THE LONG TERMINAL REPEAT OF THE MOUSE MAMMARY-TUMOR VIRUS INTO CV-1 CELLS ALLOWS A FUNCTIONAL-ANALYSIS OF STEROID-RECEPTORS

被引:8
作者
COUETTE, B [1 ]
LERICOUSSE, S [1 ]
FORTIN, D [1 ]
RAFESTINOBLIN, ME [1 ]
RICHARDFOY, H [1 ]
机构
[1] INSERM, U33, HORMONES LAB, F-94776 LE KREMLIN BICETRE, FRANCE
来源
BIOCHIMICA ET BIOPHYSICA ACTA-GENE STRUCTURE AND EXPRESSION | 1994年 / 1219卷 / 03期
关键词
MINERALOCORTICOID RECEPTOR; GLUCOCORTICOID RECEPTOR; PROGESTERONE RECEPTOR; MOUSE MAMMARY TUMOR VIRUS; TRANSCRIPTION ACTIVATION;
D O I
10.1016/0167-4781(94)90219-4
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
To analyze in situ the effects of mineralocorticoid receptor (MR) on the nucleo-protein organization of the target MMTV promoter, we have established a new cell line by integrating in CV-1 cells a construct containing the long terminal repeat of the mouse mammary tumor virus (MMTV-LTR). The MMTV-LTR contains glucocorticoid response elements (GREs), known to interact with MR. CV-1 cells were selected because they lack glucocorticoid receptor (GR). The absence of GR in the host cell line allows the selective analysis of transcription activation by aldosterone in cells expressing MR transiently. The CV-1 cells were transfected with the construct pMAMneoCAT, a plasmid containing the MMTV promoter driving the chloramphenicol acetyl transferase (CAT) gene and a gene for neomycin selection. A neomycin-resistent clone (M8), which contains two copies of the unrearranged construct was characterized. The integrated MMTV promoter is functional, as demonstrated by the induction of the CAT activity upon addition of aldosterone, dexamethasone, and R5020 to M8 cells transiently transfected with MR, GR, and progesterone receptor (PR) expression vectors, respectively. Induction of the CAT activity by dexamethasone or progesterone was 2 to 3-fold higher than by aldosterone. These differences in CAT activities were not related to differences in the levels of receptor expression. In the transiently transfected M8 cells, MR and PR contents were similar (50-70 fmol/mg protein) while GR content was higher (250 fmol/mg protein). Thus, this new cell line Ms, provides a useful tool for selectively studying the effect of MR on a target promoter organized into chromatin.
引用
收藏
页码:607 / 612
页数:6
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