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9 protocols using anti ar sc 816

1

Immunohistochemical Analysis of Steroid Receptors

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The primary antibodies used in the present study included rabbit polyclonal anti-AR (sc-816, Santa Cruz Biotechnology, Santa Cruz, CA, USA), rabbit polyclonal anti-ERα (sc-542, Santa Cruz Biotechnology), rabbit polyclonal anti-ERβ (sc-8974, Santa Cruz Biotechnology), rabbit polyclonal anti-P450arom (derived from human Aromatase C-terminus, sc-30086, Santa Cruz Biotechnology). The dilution ranges of AR, ERα, ERβ and Aromatase antibodies for immunohistochemistry were all 1:500. The specificity of AR, ERα, ERβ and P450Arom antibodies have been described in our previous studies on WGS.14 (link),24 (link) The immunohistochemistry kits with the secondary antibody of goat anti-rabbit was applied corresponding with the primary antisera.
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2

AR Knockdown in Prostate Cancer Cells

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Two siRNAs from Invitrogen, AR/HSS179973 (siRNA#1) and AR/HSS179972 (siRNA#2), were used to knock down AR expression in LNCaP-TGF-β1(a) cells and LNCaP-Ctrl cells. The corresponding sequences are CCGGAAGCUGAAGAAACUUGGUAAU (sense), AUUACCAAGUUUCUUCAGCUUCCGG (antisence) for AR/HSS179973, and GAUGAAGCUUCUGGGUGUCACUAUG (sense), CAUAGUGACACCCAGAAGCUUCAUC (antisense) for AR/HSS179972. siRNAs were transfected into LNCaP cells using GenMute™ siRNA Transfection Reagent following manufacture's protocol (SignaGen, Rockville, MD, USA). Western blots were used to verify knockdown of AR. Antibodies used are anti-AR (sc-816, Santa Cruz Biotechnology, Dallas, TX, USA) and anti-β-actin (A1978, Sigma).
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3

Western Blot Analysis of Protein Expression

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Cells were lysed in cell lysis buffer, and 30–50 μg of protein was mixed and boiled for equal loading, separated on 6–10% SDS/PAGE gels, and then transferred to PVDF membranes (Millipore, Billerica, MA, USA). We dissolved 5% skim milk in a TBST solution for blocking. After 1 h of blocking, the membranes were incubated with specific primary antibodies overnight, and then HRP-conjugated secondary antibodies were added for 1 h. An ECL system (Thermo Fisher Scientific, Rochester, NY, USA) was used for visualization. The primary antibodies used in the study included the following, anti-AR (sc-816, Santa Cruz, Dallas, TX, USA), anti-PD-L1 (#13684, Cell Signaling Technology, Danvers, Mass, USA), anti-GAPDH (sc-47724, Santa Cruz), anti-α-tubulin (sc-8035, Santa Cruz).
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4

Immunofluorescence Staining of Cellular Proteins

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Cells were rinsed twice in ice-cold phosphate-buffered saline (PBS) and fixed with a freshly prepared solution of 4% paraformaldehyde in PBS for 20 minutes and permeabilized for 10 minutes with 0.1% digitonin in PBS. After several rinses in ice-cold PBS, cells were incubated in 3% normal goat serum in PBS (blocking solution) for 30 minutes at room temperature, followed by an overnight incubation at 4°C with primary antibodies. Cells were extensively washed with PBS-0.1% digitonin and then incubated with Alexa-conjugated secondary antibodies (Molecular Probes) for 60 minutes at room temperature. Coverslips were mounted in a mounting medium. Images were captured with an API Delta Vision deconvolution microscope using SoftWorx software (Applied Precision, Issaquah, Washington, USA). Primary antibodies used were anti-AR (Sc-816, 1:200, Santa Cruz Biotechnology Inc.), anti-VAMP7 (NB100-91356, 1:1,000, Novus Biologicals), ESR1 (MA1-310, 1:200, Thermo-Fisher) and anti-RAB5 (#2143, 1:100, Cell Signaling).
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5

Hippocampal Protein Expression Analysis

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Proteins (30 μg) were extracted from the hippocampus, separated on a 7.5% polyacrylamide gel and transferred onto nitrocellulose membranes as previously described [33 (link)]. The blots were probed overnight at 4°C with polyclonal rabbit (1/400 anti-AR #sc-816 and 1/400 anti-ERα #sc-542; Santa-Cruz Biotechnology) or monoclonal mouse antisera (1/10000 anti-glyceraldehyde 3-phosphate dehydrogenase gene (GAPDH) #sc-32233 from Santa-Cruz Biotechnology). They were then incubated with horseradish peroxidase-conjugated secondary anti-rabbit #111.035.144 or anti-mouse #115.035.062 antisera (1/5000, Jackson Immunoresearch). Signals were visualized with pico- (for GAPDH) and femto- (for AR and ERα) Super Signal detection kit (Thermo Scientific), quantified with ImageJ software (NIH) and normalized with respect to GAPDH. As we have previously shown by immunohistochemistry [33 (link)], AR protein was detected in the hippocampus of control (ARfl/Y) males but not in their mutant (ARNesCre) littermates (Fig 1A). By contrast, hippocampal ERα protein was present in both ARfl/Y and ARNesCre males (Fig 1B). Quantification of ERα protein normalized to GAPDH showed similar amounts in the two genotypes (Fig 1C).
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6

Immunofluorescence Staining of Cellular Proteins

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Cells were rinsed twice in ice-cold phosphate-buffered saline (PBS) and fixed with a freshly prepared solution of 4% paraformaldehyde in PBS for 20 minutes and permeabilized for 10 minutes with 0.1% digitonin in PBS. After several rinses in ice-cold PBS, cells were incubated in 3% normal goat serum in PBS (blocking solution) for 30 minutes at room temperature, followed by an overnight incubation at 4°C with primary antibodies. Cells were extensively washed with PBS-0.1% digitonin and then incubated with Alexa-conjugated secondary antibodies (Molecular Probes) for 60 minutes at room temperature. Coverslips were mounted in a mounting medium. Images were captured with an API Delta Vision deconvolution microscope using SoftWorx software (Applied Precision, Issaquah, Washington, USA). Primary antibodies used were anti-AR (Sc-816, 1:200, Santa Cruz Biotechnology Inc.), anti-VAMP7 (NB100-91356, 1:1,000, Novus Biologicals), ESR1 (MA1-310, 1:200, Thermo-Fisher) and anti-RAB5 (#2143, 1:100, Cell Signaling).
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7

Immunostaining Protocol with Antigen Retrieval

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Immunostaining was performed with antigen retrieval (20–30′ in boiling 10mM sodium citrate pH 6.0, 0.05% Tween 20) and by incubating primary antibodies overnight at 4°C. Detection and staining was performed with Vectastain ABC kit and DAB kits (Vector laboratories). Slides were counterstained with Hematoxylin. Antibodies used: anti-APC #sc-896 and anti-AR #sc-816, from Santa Cruz Technology; anti-β-catenin #610181 (BD); anti-chromogranin A #ab1560-1, anti-MLH1 #ab92312, anti-Sox9 # ab5535, and anti-P-MEK1 ab59329 from Abcam; anti-ck17/19 #3984, anti-MSH2 #D24B5, and anti-γ-H2AX #9718, from Cell Signaling; anti-p21 #LS-C88585 (Lifespan Biosciences), and anti-p53 #CM5 (Vector Laboratories).
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8

Androgen Receptor Signaling Evaluation

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LNCaP and VCaP cells were cultured in phenol red-free RPMI 1640 medium supplemented with 2% cFBS for 1 day and treated with 1.0 µg/mL DNT or 1 nM R1881 for the indicated durations. Preparation of cell lysate and western blot analysis was carried out as described previously [24 (link)]. The primary antibodies used included anti-AR (sc816, Santa Cruz, Dallas, TX, USA), anti-PSA (ab76113, Abcam, Cambridge, UK), anti-Cyclin D1 (sc-246, Santa Cruz), anti-nucleolin (sc-13057, Santa Cruz), and anti-tubulin (T5168, Sigma-Aldrich).
The fractionation of LNCaP cells into cytosolic and nuclear fractions was performed using a nuclear/cytosol fractionation kit (BioVision Inc., Mountain View, CA) according to the manufacturer’s instructions. Digitalization was performed with ImageJ.
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9

Immunostaining Protocol with Antigen Retrieval

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Immunostaining was performed with antigen retrieval (20–30′ in boiling 10mM sodium citrate pH 6.0, 0.05% Tween 20) and by incubating primary antibodies overnight at 4°C. Detection and staining was performed with Vectastain ABC kit and DAB kits (Vector laboratories). Slides were counterstained with Hematoxylin. Antibodies used: anti-APC #sc-896 and anti-AR #sc-816, from Santa Cruz Technology; anti-β-catenin #610181 (BD); anti-chromogranin A #ab1560-1, anti-MLH1 #ab92312, anti-Sox9 # ab5535, and anti-P-MEK1 ab59329 from Abcam; anti-ck17/19 #3984, anti-MSH2 #D24B5, and anti-γ-H2AX #9718, from Cell Signaling; anti-p21 #LS-C88585 (Lifespan Biosciences), and anti-p53 #CM5 (Vector Laboratories).
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