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Multiple actions of synthetic ‘progestins’ on the growth of ZR-75-1 human breast cancer cells: Anin vitro model for the simultaneous assay of androgen, progestin, estrogen, and glucocorticoid agonistic and antagonistic activities of steroids

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Abstract

This study was designed to assess the multiple steroid receptor mediated activities of a series of synthetic ‘progestins’ on breast cancer cell growth, using the human ZR-75-1 cell line which possesses functional estrogen (ER), androgen (AR), and glucocorticoid (GR) receptors as well as progesterone (PgR) receptors. Four 17-hydroxyprogesterone derivatives (chlormadinone acetate, CMA; cyproterone acetate, CPA; medroxyprogesterone acetate, MPA; and megestrol acetate, MGA) and two 19-nortestosterone derivatives (norethindrone, NRE, and norgestrel, NRG) were thus investigated.

Based on the requirement of estrogens for PgR-mediated antiproliferative effects and the reversal of PgR-mediated action by insulin, it was found that although all ‘progestins’ could inhibit ZR-75-1 cell growth through the PgR at low concentrations, the relative contribution of this receptor in cell growth control is highly variable between compounds. The quantitative importance of PgR-mediated inhibition of cell proliferation was inversely related to the amplitude of the androgenic effects induced by the compounds, the AR-mediated effects increasing in the order CPA < MGA < CMA < NRE < NRG < MPA. The specificity of these androgenic effects is further supported by their reversal upon addition of the antiandrogen hydroxyflutamide. In addition, the 17-hydroxyprogesterone derivatives, but not the 19-nortestosterone derivatives, had glucocorticoid activities at high (micromolar) concentrations, as shown by reversal of growth inhibition by the antagonist RU486 in the presence of saturating concentrations of 5α-dihydrotestosterone. All ‘progestins’ tested, except MPA and NRE, also had some antiglucocorticoid activity, NRG being the most potent in this respect. Finally, NRE and NRG exerted a marked mitogenic effect in estrogen-free medium which was clearly mediated through the ER as shown by the competitive reversal of their action by the steroidal antiestrogen EM-139.

The present results show that growth measurements of the human breast cancer cells ZR-75-1 permit, with the appropriate steroid additions, the assay of progestin, androgen, estrogen, and glucocorticoid agonistic as vell as antagonistic activities of test compounds. The present study shows, somewhat surprisingly, that while the AR is almost completely responsible for the action of MPA at low concentrations, the majority of the action of NRE, NRG, and MGA is also exerted through AR, while the androgenic action of CPA plays a lower role in the growth inhibition induced by this compound. Such a model should be of great help in designing more specific steroid drugs and in better understanding the role of the different steroid classes which can be used to control the growth of hormone-sensitive cancer. The present data also indicate that ‘progestin’ is an inappropriate name for MPA, NRE, NRG, MGA, CMA, and CPA, which all possess other and sometimes more potent steroidal activites than those related to interaction with the progesterone receptor.

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Abbreviations

CMA:

chlormadinone acetate [17α-acetoxy-6-chloropregna-4, 6-dien-3, 20-dione]

CPA:

cyproterone acetate [17α-acetoxy-6-chloro-1α,2α-methylene-pregna-4, 6-dien-3, 20-dione]

DEX:

dexamethasone [9-fluoro-11β, 17, 21-trihydroxy-16α-methyl-pregna-1, 4-dien-3, 20-dione]

DHT:

5α-dihydrotestosterone [17β-hydroxy-5β-androstan-3-one]

E2 :

estradiol [estra-1, 3, 5 (10)-trien-3, 17β-diol]

EM 139:

[N-n-butyl-N-methyl-11-(16α-chloro-3, 17β-dihydroxyestra-1, 3, 5 (10)-triene-7α-yl) undecanamide]

MGA:

megestrol acetate [17α-acetoxy-6-methylpregna-4, 6-dien-3, 20-dionel]

MPA:

medroxyprogesterone acetate [17α-acetoxy-6-methylpregn-4-en-3, 20-dione]

NRE:

norethindrone [17β-hydroxy-19-nor-17α-pregn-4-en-20-yn-3-one]

NRG:

norgestrel [13β-ethyl-17β-hydroxy-18, 19-dinor-17α-pregn-4-en-20-yn-3-one]

OHF:

hydroxyflutamide (SCH 16423) [α, α, α-trifluoro-2-methyl-4′-nitro-m-lactotoluidide]

R1881:

methyltrienolone [17β-hydroxy-17α-methyl estra-4, 9, 11-trien-3-one]

R5020:

promegestone [17α, 21-dimethyl-19-norpregna-4, 9-dien-3, 20-dione]

RU486:

[17β-hydroxy-11β-(4-dimethylaminophenyl)-17α-(1-propynyl)-estra-4, 9-dien-3-one]

triamcinolone acetonide:

[9-fluoro-11β, 21-dihydroxy-16α, 17(1-methylethylidenebis 〈oxy〉) pregna-1, 4-dien-3, 20-dione]

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Poulin, R., Baker, D., Poirier, D. et al. Multiple actions of synthetic ‘progestins’ on the growth of ZR-75-1 human breast cancer cells: Anin vitro model for the simultaneous assay of androgen, progestin, estrogen, and glucocorticoid agonistic and antagonistic activities of steroids. Breast Cancer Res Tr 17, 197–210 (1991). https://doi.org/10.1007/BF01806369

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