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β estradiol

Manufactured by Thermo Fisher Scientific
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β-estradiol is a laboratory reagent that is used for research purposes. It is a naturally occurring steroid hormone that plays a role in the regulation of the estrous and menstrual cycles. β-estradiol can be used in various research applications, such as cell culture studies, receptor binding assays, and hormone analysis.

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9 protocols using β estradiol

1

Maintenance of Lung Cancer Cell Lines

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MLE-12 cells were maintained in HITES medium consisting of DMEM/F12 (ATCC, 30-2006), 2% fetal bovine serum (FBS), 0.005 mg/ml insulin, 0.01 mg/ml transferrin (Fitzgerald, 31C-CH1026), 30 nM sodium selenite (Santa Cruz, 253595), 10 nM hydrocortisone (Sigma, H0888), 10 nM β-estradiol, 10 mM HEPES (Gibco, 15630106), 2 mM l-glutamine (Gibco, 25030081), and 1% Pen-Step (Gibco, 15140122). H441 cells were maintained in RPMI-1640 (ATCC, 30-2001) medium supplemented with 10% FBS and 1% Pen-Strep.
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2

Spermatogonial Stem Cell Culture Protocol

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SSCs were cultured on plate with laminin-coated or Sertoli cell feeders. Primary Sertoli cells cultured using DMEM/F12 (Gibco, Grand Island, NY, USA) were supplemented with 10% FBS (Gibco). When Sertoli cells reached about 90% confluency, the cells were treated with mitomycin C (10 mg/l, Sigma, St. Louis, MO, USA) for 3 h and washed five times with PBS. SSCs culture medium consisted of DMEM/F12 (Gibco) supplemented with 1% FBS (Gibco), 30 ng/ml β-estradiol (Gibco), 100 U/ml penicillin, 100 μg/ml streptomycin, 1 × MEM non-essential amino acids, 20 ng/ml GDNF, 10 ng/ml mouse EGF, 10 ng/ml bFGF. The medium was changed every 2–3 days.
The C18-4 cell line was established from type A spermatogonia isolated from 6-day-old mouse testes.43 (link) The cells were maintained in DMEM medium supplemented with 10% fetal calf serum, 1 mM sodium pyruvate, 2 mM glutamine, 50 U/ml penicillin, 50 μg/ml streptomycin and 100 mM non-essential amino acids. The siRNA sequences targeting mouse ESET and Cox4i2 mRNA were designed and synthesized by Genepharma Company (Shanghai, China). The siRNAs were transfected into C18-4 cells using Lipofectamine2000 (Invitrogen, Carlsbad, CA, USA) according to the manufacturer's protocol.
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3

Hoxb8-FL Derived Cell Culture

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Parental cells (Hoxb8-FL cells) were cultured in RPMI 1640 medium (Sigma-R8758) supplemented with 10% fetal bovine serum (FBS) (HyCloneTM GE Healthcare), 1% penicillin/streptomycin (Sigma-P0781), 1% l-Glutamine (Sigma-G7513), 0.1% 2-Mercaptoethanol (50 mM stock)(Gibco®), cell culture supernatant from an Flt3L-producing B16 melanoma cell line (5% final concentration) and 1 µM β-estradiol (Sigma-E2758), as originally described16 (link). ME-Parental cell line was cultured as Parental cells. ME-Transformed and MLL-ENL BM were cultured in RPMI 1640 medium (Sigma-R8758) supplemented with 10% FBS (HyCloneTM GE Healthcare), 1% penicillin/streptomycin (Sigma-P0781), 1% l-Glutamine (Sigma-G7513), 0.1% 2-Mercaptoethanol (50 mM stock) (Gibco®) and 10 ng/ml of recombinant murine interleukin 3 (IL-3) (PeproTech). All cell lines were kept at a concentration of 1–10 × 105 cells/ml and the medium was replenished every 1–2 days.
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4

Cell Cycle Synchronization Using Estradiol

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Cell cycle experiments were performed similarly to our previous study16 (link): two sequential 24-h pre-cultures were grown on 1% ethanol minimal medium (EMM) media containing 15 and 10 nM β-estradiol (Alfa Aesar), respectively. To induce cell cycle arrest, cells were filtered, washed and the filter resuspended in estradiol-free EMM (starting OD600 was between 0.1 and 0.2). Before release, inducible LexApr-CLN1 strains were arrested for 15 h. Cells were released into the cell cycle by addition of 200 nM β-estradiol (dissolved at 1 mM in 100% ethanol). Cell cycle arrest and release were verified by bud count at 60 × magnification in a light microscope.
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5

Engineered Yeast Strains for Cell Cycle Study

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All strains were constructed using homologous recombination in a prototrophic Saccharomyces cerevisiae W303 derived background. Plasmid containing NTH1 were constructed using standard molecular cloning. Plasmids were linearized with either SalI in the promoter (full-length constructs) and integrated into the genomic NTH1 promotor or with StuI in the URA3 region (reporter constructs) and integrated into the URA3 locus. All constructs were Sanger-sequenced. Cell cycle inducible strains from our previous study16 (link) were used. Estradiol inducible strains were transformed and maintained on YPD plates containing 100 nM β-estradiol (Alfa Aesar). A detailed strain list is included in the Supplementary Information.
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6

QTRT1 Knockout in Breast Cancer Cells

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The highly aggressive breast cancer cell line human MCF7 cells were cultured in a 6-well tissue culture plate in antibiotic-free MCF7 cell growth medium (Eagle’s minimum essential medium with 10% FBS, 10 µg/mL bovine insulin, and 10 nM β-estradiol; Invitrogen, Carlsbad, CA, USA) to 70%–80% confluence. Cells were transfected with 2 µg of QTRT1 Double Nickase Plasmid (sc-413456-NIC), 10 µL LTX Lipofectamine, and 2.5 µL PLUS Reagent (Invitrogen) per well (manufacturer’s protocol). The plasmid encodes a D10A mutated Cas9 nuclease and a unique, target-specific 20-nt guide RNA (gRNA), which has greater specificity of gene knockout than the CRISPR/Cas9 KO plasmid counterpart. QTRT1 Double Nickase Plasmid-derived puromycin resistance gene was used for positive selection of transfected cells. Cells were selected with 1 µg/mL puromycin for 5 days when further cell death was not observed. After selection, cells were collected and serial diluted onto four 96-well plates. Single cells were expanded to obtain individual clones for further study. The culture of MDA-MB-231 cells was as described before [53 (link)], and transfection and selection were as described above.
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7

β-estradiol-induced cell proliferation assay

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A β-estradiol-induced cell proliferation assay was performed with
steroid-depleted medium, in which RPMI 1640 medium without phenol red
(Invitrogen) was supplemented with 5% charcoal-stripped bovine calf serum
(Thermo Scientific), 1% nonessential amino acids solution, 1 mmol/l sodium
pyruvate, and 0.01 mg/ml bovine insulin. MCF-7 cells were preincubated with
steroid-depleted medium for 6 days, and 2 × 103 of these cells
were re-seeded into 96-well F-bottom plates and incubated for 24 h at 37°C.
β-estradiol (Sigma-Aldrich, final concentration 1 nmol/l) was added followed
by increasing concentrations of KW-2450 or 4-hydroxytamoxifen
(Sigma-Aldrich) and then incubated for 7 days at 37°C. For the
aromatase-dependent cell proliferation assay, MCF-7-Ac1 cells were
preincubated, re-seeded, and treated with steroid-depleted medium according
to the same method as for MCF-7 cells. However, androstenedione
(Sigma-Aldrich, final concentration of 10 nmol/l) was then added followed by
increasing concentrations of KW-2450 or letrozole (Kemprotec, Middlesbrough,
UK) and then incubated for 7 days at 37°C. Cell viability was determined
using Cell Proliferation Reagent WST-1 (Roche Diagnostics, Mannheim,
Germany). The CI and combination effect were determined as previously
described.
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8

Endometrial Stromal Cell Co-culture with Blastocysts

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Endometrial stromal cells were isolated and cultured from four biopsies of controls, as described above. ESCs transfected with CDYL shRNA or negative shRNA were grown to confluence in a 24-well plate. Cells were then decidualized by treatment with 10 nM β-estradiol (E2758, Thermo Fisher Scientific), 1 μM progesterone (V900699, Thermo Fisher Scientific), and 1 mM 8-Br-cAMP (ab141448, Abcam) for 48 h. Then hatched blastocysts from C57BL/6 mice with a normal morphology were cocultured with confluent monolayers of decidualized ESCs for 72 h in DMEM/F12 complete medium. The morphological images were captured by microscope TS2 (Nikon, Tokyo, Japan). The trophoblast outgrowth areas were outlined manually and measured using Image J 1.46r.
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9

Hyperoxia-induced Lung Cell Damage

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Murine lung epithelial cells (MLE-12) were acquired from ATCC (Manassas, VA, USA) and cultured in Dulbecco's modified eagle medium (DMEM)/F-12 with 2% fetal bovine serum (FBS), 10-nM hydrocortisone, and 10-nM β-estradiol (Thermo Fisher Scientific, Waltham, MA, USA) at 37°C. In order to induce oxygen toxicity, MLE-12 cells were kept in hyperoxic condition with 85% O 2 for 24 h. Cells in the control group were exposed to normoxic condition with 21% O 2 . For cell transfection, MLE-12 cells were seeded in 96-well plates and transfected with plasmid cloning DNA (pcDNA) vector, pcDNA-EDA2R, small hairpin negative control (shNC), shEDA2R (GenePharma, Suzhou, China) via lipofectamine 2000 (Thermo Fisher Scientific) under hyperoxic condition.
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