H M J Werner1, H R Franke, I Vermes. 1. Departments of Obstetrics and Gynecology, Medisch Spectrum Twente Hospital Group, Enschede, The Netherlands.
Abstract
OBJECTIVE: Selective estrogen receptor modulators (SERMs) decrease the risk of developing breast cancer. As an antagonistic effect, SERMs may aggravate or induce climacteric symptoms. Hormone therapy (HT) would be able to alleviate these symptoms. The present in vitro study tries to elucidate the effects of several HT preparations combined with SERMs on estrogen receptor-positive (ER +) (i.e. MCF-7 and T-47D) and -negative (ER-) (i.e. MDA-MB-231) human breast cancer cells in vitro. METHODS: We performed experiments with various HT preparations (estradiol (E2)/E2 + progesterone/E2 + dihydrodydrogesterone /E2 + norethisterone acetate/E2 + medroxyprogesterone acetate/tibolone) in the concentration of 10(-6) mol/l together with SERMs (raloxifene or tamoxifen) added to different breast cancer cell lines in vitro. After an incubation period of 144 h, proliferation and apoptosis were measured. The first was measured by quantification of the expression of cyclin D1 mRNA, the latter by the Nicoletti method. RESULTS: This in vitro study clearly demonstrates differences in results if various HT preparations, combined with SERMs, are added to ER + and ER- breast cancer cell lines. CONCLUSIONS: Adding estradiol/progestogens in combination with a SERM to estrogen receptor-positive breast cancer cell lines does not obligatorily lead to proliferation of tumor cells. Not all progestogens act equally.
OBJECTIVE: Selective estrogen receptor modulators (SERMs) decrease the risk of developing breast cancer. As an antagonistic effect, SERMs may aggravate or induce climacteric symptoms. Hormone therapy (HT) would be able to alleviate these symptoms. The present in vitro study tries to elucidate the effects of several HT preparations combined with SERMs on estrogen receptor-positive (ER +) (i.e. MCF-7 and T-47D) and -negative (ER-) (i.e. MDA-MB-231) humanbreast cancer cells in vitro. METHODS: We performed experiments with various HT preparations (estradiol (E2)/E2 + progesterone/E2 + dihydrodydrogesterone /E2 + norethisterone acetate/E2 + medroxyprogesterone acetate/tibolone) in the concentration of 10(-6) mol/l together with SERMs (raloxifene or tamoxifen) added to different breast cancer cell lines in vitro. After an incubation period of 144 h, proliferation and apoptosis were measured. The first was measured by quantification of the expression of cyclin D1 mRNA, the latter by the Nicoletti method. RESULTS: This in vitro study clearly demonstrates differences in results if various HT preparations, combined with SERMs, are added to ER + and ER- breast cancer cell lines. CONCLUSIONS: Adding estradiol/progestogens in combination with a SERM to estrogen receptor-positive breast cancer cell lines does not obligatorily lead to proliferation of tumor cells. Not all progestogens act equally.
Authors: Steven R Cummings; Bruce Ettinger; Pierre D Delmas; Peter Kenemans; Victoria Stathopoulos; Pierre Verweij; Mirjam Mol-Arts; Lenus Kloosterboer; Lori Mosca; Claus Christiansen; John Bilezikian; Eduardo Mario Kerzberg; Susan Johnson; Jose Zanchetta; Diederich E Grobbee; Wilfried Seifert; Richard Eastell Journal: N Engl J Med Date: 2008-08-14 Impact factor: 91.245
Authors: Klaus H Baumann; Elmar Klusmeier; Isabel Eggemann; Silke Reinartz; Achim Almeroth; Mathias Kalder; Uwe Wagner Journal: Breast Cancer (Auckl) Date: 2009-04-07
Authors: Job Komen; Floor Wolbers; Henk R Franke; Helene Andersson; Istvan Vermes; Albert van den Berg Journal: Biomed Microdevices Date: 2008-10 Impact factor: 2.838