Molecular Endocrinology, Vol 3, 552-558, Copyright © 1989 by Endocrine Society

ARTICLES

Regulation of cathepsin-D and pS2 gene expression by growth factors in MCF7 human breast cancer cells

V Cavailles, M Garcia and H Rochefort
Unite Hormones et Cancer, INSERM, Montpellier, France.

In MCF7 human breast cancer cells, cathepsin-D and pS2 mRNAs are specifically and directly induced by estrogens at the transcriptional level. We studied the regulation of expression of these two genes by growth factors that are also mitogenic in this cell line. We show that pS2 mRNA, like cathepsin-D mRNA, is rapidly induced 2- to 4-fold by epidermal growth factor. The effect of epidermal growth factor on these two mRNAs was dependent upon de novo protein synthesis, indicating a different mechanism of regulation than with estradiol. Other peptide growth factors, such as insulin, insulin-like growth factor I, and basic fibroblast growth factor, also increased up to 3-fold the steady state levels of the two mRNAs in MCF7 cells. The pS2 mRNA, but not cathepsin-D mRNA, was also induced up to 8-fold by protein kinase-C activation with 12-O-tetradecanoylphorbol-13-acetate, suggesting the possible involvement of this transduction pathway in pS2 mRNA induction. The effect of 12-O-tetradecanoylphorbol-13-acetate was time and dose dependent and required protein synthesis. In addition, treatment by agents elevating cAMP increased pS2 mRNA accumulation 4- fold, whereas it had no effect on cathepsin-D mRNA levels. These results demonstrate that cathepsin-D and pS2 genes are under complex regulation in MCF7 cells, since growth factors stimulate their expression via indirect mechanisms contrasting with the primary transcriptional effects of estrogens.

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