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1

Characterization of COS-1 Kidney Cells

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The COS-1 monkey kidney cell line was obtained from the ATCC and was
previously described [6 (link)]. Only
mycoplasma-negative cells were used in experiments. P4, MPA, NET-A,
LNG, GES, ETG, NES, NoMAC, DRSP, Ald, spironolactone and phorbol
12-myristate13-acetate (PMA) were obtained from Sigma-Aldrich, RSA.
[3H]-Ald (83.4 Ci/mmol) was purchased from PerkinElmer Life and
Analytical Science, RSA.
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2

Protein Expression Analysis in Cell Lines

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The following primary antibodies were obtained from Santa Cruz Biotechnology Inc., USA; GR(H-300): sc-8992, PR(C-20) (which detects PRA and B isoforms): sc-539, AR(441): sc-7305, GAPDH(0411): sc-47724, MR(MCR, H300): sc-11412, ERα(MC-20): sc-542. The flotillin-1 (610820) antibody was purchased from BD Transduction Laboratories (USA). The following secondary antibodies were obtained from Santa Cruz Biotechnology Inc., USA; anti-mouse: sc-2005, anti-goat: sc-2350 (used as IgG for the ChIP assay) and anti-rabbit: sc-2313. The ligands dexamethasone (DEX), MPA, P4, NET-A, NET, aldosterone (ALD) and mibolerone (MIB) were obtained from Sigma-Aldrich (South Africa). Human tumour necrosis factor α (TNFα) was obtained from Celtic Diagnostics (South Africa). Protease inhibitor cocktail tablets (EDTA-free) (cat #04693159001) were obtained from Roche (South Africa). Cycloheximide (CHX) was purchased from Sigma-Aldrich (South Africa).
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3

Receptor Binding Assay Protocol

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P4, MPA, NET-A, levonorgestrel (LNG), gestodene (GES), nestorone (NES), nomegestrol acetate (NoMAC), drospirenone (DRSP), dihydrotestosterone (DHT), hydroxyflutamide (OHF), estradiol (E2), fulvestrant (ICI 182,780) and phorbol 12-myristate13-acetate (PMA) were obtained from Sigma-Aldrich, RSA. Human tumor necrosis factor-alpha (TNFα) was obtained from Celtic Diagnostics, RSA. Unlabeled mibolerone (MIB) and [3H]-MIB (84.3 Ci/mmol) were purchased from PerkinElmer Life and Analytical Science, RSA, while [3H]-E2 (100 Ci/mmol) was obtained from AEC-Amersham, RSA.
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4

Steroid Hormone Profiling Protocol

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MPA, NET-A, LNG, GES, NES, NoMAC, DRSP, pregnenolone (Preg), Prog, 17OH-Preg, 17OH-Prog, 16OH-Prog, deoxycorticosterone (DOC), corticosterone (CORT), 11-dehydrocorticosterone (11-DHC), aldosterone (Ald), deoxycortisol, cortisol, cortisone, dehydroepiandrosterone (DHEA), A4, testosterone, forskolin (FSK) and trilostane, were obtained from Sigma–Aldrich, South Africa, while 11β-hydroxyandrostenedione (11OH-A4) was purchased from Steraloids, USA. All test compounds, as well as FSK, were prepared in dimethylsulfoxide (DMSO), and added to the culturing medium at a final concentration of 0.2% DMSO. The deuterated internal standards, d2-testosterone, d9-Prog, d9-17OH-Prog and d4-cortisol were purchased from Cambridge Isotope Laboratories (Maryland, USA).
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