title: Impact of structural modifications at positions 13, 16 and 17 of 16β-(m-carbamoylbenzyl)-estradiol on 17β-hydroxysteroid dehydrogenase type 1 inhibition and estrogenic activity.
abstract: The chemical synthesis of four stereoisomers (compounds 5a-d) of 16β-(m-carbamoylbenzyl)-estradiol, a potent reversible inhibitor of 17β-hydroxysteroid dehydrogenase type 1 (17β-HSD1), and two intermediates (compounds 3a and b) was performed. Assignment of all nuclear magnetic resonance signals confirmed the stereochemistry at positions 13, 16 and 17. Nuclear overhauser effects showed clear correlations supporting a C-ring chair conformation for 5a and b and a C-ring boat conformation for 5c and d. These compounds were tested as 17β-HSD1 inhibitors and to assess their proliferative activity on estrogen-sensitive breast cancer cells (T-47D) and androgen-sensitive prostate cancer cells (LAPC-4). Steroid derivative 5a showed the best inhibitory activity for the transformation of estrone to estradiol (95, 82 and 27%, at 10, 1 and 0.1μM, respectively), but like the other isomers 5c and d, it was found to be estrogenic. The intermediate 3a, however, was weakly estrogenic at 1μM, not at all at 0.1μM, and showed an interesting inhibitory potency on 17β-HSD1 (90, 59 and 22%, at 10, 1 and 0.1μM, respectively). As expected, no compound showed an androgenic activity. The binding modes for compounds 3a and b, 5a-d and CC-156 were evaluated from molecular modeling. While the non-polar interactions were conserved for all the inhibitors in their binding to 17β-HSD1, differences in polar interactions and in binding conformational energies correlated to the inhibitory potencies.
authors.affiliation: Endocrinology and Nephrology Unit, CHU de Québec-Research Center (CHUL, T4), Québec City, QC, Canada; Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec City, QC, Canada.
authors.forename: René
authors.initials: R
authors.lastname: Maltais
authors.affiliation: Endocrinology and Nephrology Unit, CHU de Québec-Research Center (CHUL, T4), Québec City, QC, Canada; Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec City, QC, Canada.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Trottier
authors.affiliation: Département de chimie, Institut de biologie intégrative et des systèmes (IBIS), Québec City, QC, Canada; Centre de recherche sur la fonction, la structure et l'ingénierie des protéines (PROTEO),Université Laval, Québec City, QC, Canada.
authors.forename: Xavier
authors.initials: X
authors.lastname: Barbeau
authors.affiliation: Centre de recherche sur la fonction, la structure et l'ingénierie des protéines (PROTEO),Université Laval, Québec City, QC, Canada; Département de biochimie microbiologie et bio-informatique, Institut de biologie intégrative et des systèmes (IBIS), Québec City, QC, Canada.
authors.forename: Patrick
authors.initials: P
authors.lastname: Lagüe
authors.affiliation: Endocrinology and Nephrology Unit, CHU de Québec-Research Center (CHUL, T4), Québec City, QC, Canada; Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec City, QC, Canada.
authors.forename: Martin
authors.initials: M
authors.lastname: Perreault
authors.affiliation: Endocrinology and Nephrology Unit, CHU de Québec-Research Center (CHUL, T4), Québec City, QC, Canada; Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec City, QC, Canada.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Thériault
authors.affiliation: Endocrinology and Nephrology Unit, CHU de Québec-Research Center (CHUL, T4), Québec City, QC, Canada; Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec City, QC, Canada.
authors.forename: Sheng-Xiang
authors.initials: SX
authors.lastname: Lin
authors.affiliation: Endocrinology and Nephrology Unit, CHU de Québec-Research Center (CHUL, T4), Québec City, QC, Canada; Department of Molecular Medicine, Faculty of Medicine, Université Laval, Québec City, QC, Canada. Electronic address: donald.poirier@crchul.ulaval.ca.
authors.forename: Donald
authors.initials: D
authors.lastname: Poirier
mesh_terms: D015067:17-Hydroxysteroid Dehydrogenases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D045744:Cell Line, Tumor; D004791:Enzyme Inhibitors / Q000737:chemistry* / Q000494:pharmacology*; D004958:Estradiol / Q000737:chemistry* / Q000494:pharmacology*; D004967:Estrogens / Q000737:chemistry* / Q000494:pharmacology*; D004970:Estrone / Q000378:metabolism; D006801:Humans; D008958:Models, Molecular; D013237:Stereoisomerism
chemical_list: D004791:Enzyme Inhibitors; D004967:Estrogens; D004970:Estrone; D004958:Estradiol; D015067:17-Hydroxysteroid Dehydrogenases; C044256:3 (or 17)-beta-hydroxysteroid dehydrogenase
keywords: Chemical synthesis; Enzyme inhibitor; Estradiol isomer; Estrogen; Steroid