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Biochem Biophys Res Commun. 1991 Jan 31;174(2):816-24.

Cathepsin D gene of human MCF7 cells contains estrogen-responsive sequences in its 5' proximal flanking region.

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Unité Hormones et Cancer (U 148) INSERM, Université de Montpellier I, France.


Cathepsin D is a lysosomal protease produced and secreted in excess by most human breast cancer cells. In MCF7 cells, estrogens stimulate cathepsin D expression at the mRNA level via a mechanism independent of de novo protein synthesis. We have isolated the human cathepsin D gene and its 5' flanking sequences from a MCF7 genomic library. To demonstrate its transcriptional estrogen regulation, we constructed chimeric recombinants bearing different fragments of the cathepsin D gene 5' proximal region inserted in front of the bacterial chloramphenicol acetyl transferase reporter gene. By transient cotransfection with the estrogen receptor expression vector into MCF7 cells, we showed that a 240 bp fragment located in the 5' proximal region of the gene was able to mediate transcriptional estrogen activation. This induction was concentration-dependent and suppressed by the antiestrogen ICI 164, 384.

[Indexed for MEDLINE]

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