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antiestrogen pregnan

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https://www.readbyqxmd.com/read/25822320/association-of-ddt-and-heptachlor-epoxide-in-human-blood-with-diabetic-nephropathy
#1
Charles J Everett, Olivia M Thompson
Six organochlorine pesticides and pesticide metabolites in human blood were tested to determine their relationships with diabetic nephropathy. The data were derived from the National Health and Nutrition Examination Survey (NHANES) 1999-2004 (unweighted, n=2992, population estimate=133,088,752). The six chemicals were p,p'-DDT (dichlorodiphenyltrichloroethane), p,p'-DDE (dichlorodiphenyltrichloroethylene), beta-hexachlorocyclohexane, oxychlordane, trans-nonachlor and heptachlor epoxide. In this research, total diabetes included diagnosed and undiagnosed diabetes (glycohemoglobin, A1c ≥6...
2015: Reviews on Environmental Health
https://www.readbyqxmd.com/read/18299335/role-of-human-pregnane-x-receptor-in-tamoxifen-and-4-hydroxytamoxifen-mediated-cyp3a4-induction-in-primary-human-hepatocytes-and-ls174t-cells
#2
Rucha S Sane, Donna J Buckley, Arthur R Buckley, Srikanth C Nallani, Pankaj B Desai
Previously we observed that the antiestrogens tamoxifen and 4-hydroxytamoxifen (4OHT) induce CYP3A4 in primary human hepatocytes and activate human pregnane X receptor (PXR) in cell-based reporter assays. Given the complex cross-talk between nuclear receptors, tissue-specific expression of CYP3A4, and the potential for tamoxifen and 4OHT to interact with a myriad of receptors, this study was undertaken to gain mechanistic insights into the inductive effects of tamoxifen and 4OHT. First, we observed that transfection of the primary cultures of human hepatocytes with PXR-specific small interfering RNA reduced the PXR mRNA expression and the extent of CYP3A4 induction by tamoxifen and 4OHT by 50%...
May 2008: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/17379461/estrogens-and-antiestrogens-activate-hpxr
#3
Wissem Mnif, Jean-Marc Pascussi, Arnaud Pillon, Aurélie Escande, Aghleb Bartegi, Jean-Claude Nicolas, Vincent Cavaillès, Marie-Josèphe Duchesne, Patrick Balaguer
The pregnane X receptor (PXR, NR1I2) and the estrogen receptors (ERalpha, NR3A1 and ERbeta, NR3A2) bind a large number of compounds, including environmental pollutants and drugs, which exhibit remarkably diverse structural features. This prompted us to investigate if ER ligands could be PXR activators. We focused our attention on known estrogens from various chemical classes: physiological and synthetic estrogens and antiestrogens, plant and fungus estrogens, and other man-made chemicals belonging to phthalate plasticizers, surfactant-derived alkylphenols and cosmetics...
April 5, 2007: Toxicology Letters
https://www.readbyqxmd.com/read/11950795/induction-of-cytochrome-p450-3a4-in-primary-human-hepatocytes-and-activation-of-the-human-pregnane-x-receptor-by-tamoxifen-and-4-hydroxytamoxifen
#4
Pankaj B Desai, Srikanth C Nallani, Rucha S Sane, Linda B Moore, Bryan J Goodwin, Donna J Buckley, Arthur R Buckley
Tamoxifen is a widely utilized antiestrogen in the treatment and chemoprevention of breast cancer. Clinical studies document that tamoxifen administration markedly enhances the systemic elimination of other drugs. Additionally, tamoxifen enhances its own clearance following repeated dosing. The mechanisms that underlie these clinically important events remain unresolved. Here, we report that tamoxifen and its metabolite 4-hydroxytamoxifen markedly induce cytochrome P450 3A4, a drug-metabolizing enzyme of central importance, in primary cultures of human hepatocytes...
May 2002: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/10419026/proapoptotic-effects-of-antiestrogens-progestins-and-androgen-in-breast-cancer-cells
#5
M Kandouz, A Lombet, J Y Perrot, D Jacob, S Carvajal, A Kazem, W Rostene, A Therwath, A Gompel
The promoting action of E2 in breast cancer cells has been, until now, mainly linked to its action on prolifieration. Because of the importance of an increase in apoptosis in breast cancer prevention, we have studied the possible effects of various antiestrogens, progestins and an androgen on its occurrence in three hormone-dependent breast cancer cell lines. The antiestrogens were, a triphenylethylene derivative, 4 hydroxytamoxifen (4OHTAM) and two steroidal antiestrogens, IC1182780 and RU58668. The progestins were Org2058, a pregnane derivative, tibolone (OrgOD14), a normethyltestosterone derivative and OrgOM38 (the delta4 isomer of OrgOD14) and the androgen dihydrotestosterone (DHT)...
April 1999: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/9784163/activity-guided-isolation-of-steroidal-alkaloid-antiestrogen-binding-site-inhibitors-from-pachysandra-procumbens
#6
L C Chang, K P Bhat, E Pisha, E J Kennelly, H H Fong, J M Pezzuto, A D Kinghorn
Four novel steroidal alkaloids, (+)-(20S)-20-(dimethylamino)-3-(3'alpha-isopropyl)-lactam-5alpha-+ ++preg n-2-en-4-one (1), (+)-(20S)-20-(dimethylamino)-16alpha-hydroxy-3-(3'alpha-isopropyl) -la ctam-5alpha-pregn-2-en-4-one (2), (+)-(20S)-3-(benzoylamino)-20-(dimethylamino)-5alpha-pregn-2-en-++ +4beta -yl acetate (3), and (+)-(20S)-2alpha-hydroxy-20-(dimethylamino)-3beta-phthalimido-5 alpha- pregnan-4beta-yl acetate (4), as well as five known compounds, (-)-pachyaximine A (5), (+)-spiropachysine (6), (+)-axillaridine A (7), (+)-epipachysamine D (8), and (+)-pachysamine B (9), were isolated from Pachysandra procumbens, using a bioassay-guided fractionation based on inhibition of 3H-tamoxifen binding at the antiestrogen binding site (AEBS)...
October 1998: Journal of Natural Products
https://www.readbyqxmd.com/read/8541241/effects-of-two-classes-of-progestagens-pregnane-and-19-nortestosterone-derivatives-on-cell-growth-of-human-breast-tumor-cells-ii-t47d-cell-lines
#7
COMPARATIVE STUDY
W G Schoonen, J W Joosten, H J Kloosterboer
Two classes of progestagens, e.g. pregnane [Org 2058, progesterone (PROG), R5020, medroxyprogesterone acetate (MPA)] and 19-nortestosterone derived progestagens [norethisterone (NE), levonorgestrel (LNG), 3-ketodesogestrel (KDG), gestodene (GES), Org 30659] were studied for their effect on cell growth of two human breast tumor T47D cell lines of different origin, i.e. from ATCC (A) and Sutherland (S) et al. [Sutherland et al., Cancer Res. 48 (1988) 5084-5091]. The effect of estradiol (E2) and progestagens alone as well as the combined effect of E2 (10(-10) M) and progestagens were investigated at several dose levels...
December 1995: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/8541240/effects-of-two-classes-of-progestagens-pregnane-and-19-nortestosterone-derivatives-on-cell-growth-of-human-breast-tumor-cells-i-mcf-7-cell-lines
#8
W G Schoonen, J W Joosten, H J Kloosterboer
The effects of two classes of progestagens, e.g. pregnane [Org 2058, medroxyprogesterone acetate (MPA), R5020, progesterone (PROG)] and 19-nortestosterone derived progestagens [3-ketodesogestrel (KDG), levonorgestrel (LNG), gestodene (GES), norethisterone (NE), Org 30659] on proliferation of three estradiol (E2)-dependent human breast tumor MCF-7 cell lines of different origin [Van der Burg (B), Litton bionetics (L) and McGrath (M)] were studied. The pregnane derivatives hardly stimulated cell growth at 10(-6) M in MCF-7 B and L cells except for Org 2058 in B cells, whereas in M cells a statistically significant growth induction was observed except for PROG...
December 1995: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/7577723/lack-of-estrogenic-potential-of-progesterone-or-19-nor-progesterone-derived-progestins-as-opposed-to-testosterone-or-19-nor-testosterone-derivatives-on-endometrial-ishikawa-cells
#9
COMPARATIVE STUDY
J Botella, E Duranti, V Viader, I Duc, R Delansorne, J Paris
Estrogen receptors of human endometrial cancer Ishikawa cells were found to be present in moderate amounts (160-200 fmol/mg protein), and to specifically bind moxestrol (R2858) with a very high affinity characterized by a Kd around 60 pM, when measured under equilibrium conditions. The binding specificity respected a decreasing order as follows: estradiol (E2: 100%) > 4-hydroxy-tamoxifen (4OHTAM: 52.7%) > estriol (E3: 5.7%) > estrone (E1: 2.1%) > TAM (0.2%). The induction of alkaline phosphatase activity (APase) used as an estrogen-specific response, confirmed the intrinsic estrogenicity of progestins derived from 19-nor-testosterone (19NT): norethindrone (NOR), norethynodrel and levonorgestrel, at concentrations ranging from 10(-8) to 10(-6) M...
October 1995: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/2615357/endocrine-profile-of-win-49596-in-the-rat-a-novel-androgen-receptor-antagonist
#10
B W Snyder, R C Winneker, F H Batzold
Win 49596 is a new orally active, steroidal androgen receptor antagonist. Win 49596 inhibited ventral prostate, seminal vesicle and levator ani weight gain in either 5 alpha-dihydrotestosterone (DHT) or testosterone propionate-treated castrated, immature male rats. In intact, adult male rats, Win 49596 significantly inhibited weight gain by the ventral prostate, dorsal lateral prostate and seminal vesicles, but not the testes at doses as low as 50 mg/kg/day x 14 p.o. However, daily oral administration of equivalent antiandrogenic doses of either Win 49596, ICI 176,334, or flutamide for 14 days to mature, intact male rats resulted in elevations of circulating testosterone of approximately 3-, 2-, and 10-fold, respectively...
December 1989: Journal of Steroid Biochemistry
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