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Horm Metab Res. 2004 Jul;36(7):437-44.

Impairment of the antiproliferative effect of glucocorticosteroids by 11beta-hydroxysteroid dehydrogenase type 2 overexpression in MCF-7 breast-cancer cells.

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1
Department of Obstetrics and Gynecology, Charité, Germany.

Abstract

To verify the relevance of 11beta-hydroxysteroid dehydrogenase type 2 (11beta-HSD2) activity in controlling breast-cancer cell growth, we have evaluated the correlation of 11beta-HSD2 expression and antiproliferative effects of glucocorticosteroids (GCs) on breast cancer cell proliferation. We cloned human 11beta-HSD2 cDNA into the expression vector pBK-CMV. The interspersing lac promoter region was deleted, achieving differential translational efficiency. The constructs were stably transfected into wild-type MCF-7 breast-cancer cells possessing almost no oxidative and no reductive 11beta-HSD activity. Low (times 7) and high (times 718) 11beta-HSD2 overexpression was achieved. We compared growth behavior of transfected cells In the presence of GCs to MCF-7 cells transfected with pBK-CMV alone (internal control). The antiproliferative effects of GCs were reversed and total cell growth boosted by overexpression of 11beta-HSD2; about 50 % of the increase in cell proliferation was attained by low 11beta-HSD2 overexpression, while high enzyme overexpression led to an increase in cell growth of about 120 %. Using direct evidence, this study shows 11beta-HSD2 to impair antiproliferative glucocorticosteroid effects, thus acting as an enzymatic shield aggravating breast-cancer cell growth. These results indicate a possible therapeutic role for 11beta-HSD inhibitors in the treatment of breast cancer.

PMID:
15305225
DOI:
10.1055/s-2004-825724
[Indexed for MEDLINE]

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