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29 protocols using bt474

1

Breast Cancer Cell Lines and Tamoxifen Resistance

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Human breast cancer cell lines MCF-7 (HTB-22, ATCC), T-47D (HTB-133, ATCC), ZR-75-1 (CRL-1500, ATCC) and BT-474 (HTB-20, ATCC) were obtained from the American Type Culture Collection. The cells were grown in DMEM with L-Glutamine (MCF-7 and BT-474, PAN Biotech, Aidenbach, Germany) or RPMI-1640 with L-Glutamine (ZR-75-1 and T-47D, PAN Biotech) supplemented with 10 % FCS (Gibco, Life Technologies, Carlsbad, CA) and 1 % penicillin/streptomycin (Gibco). Culture media for T-47D, MCF-7 and BT-474 additionally contained 0,1 % bovine insulin (Sigma. St. Louis, MO). The tamoxifen-resistant cell lines (MCF-7 Tam1, T-47D Tam1 & Tam2, ZR-75-1 Tam1 & Tam2, BT-474 Tam1 & Tam2) were derived from the parental cell lines by continuous exposure to 4-OH-tamoxifen (Sigma, 1 μM in ethanol) for 8–12 months. Culture media was replaced every 2–3 days. All cells were incubated at 37 °C with 5 % CO2 and passaged when ca 80 % confluent. The approximate doubling times of the cells were as follows: parental MCF-7, T-47D, ZR-75-1 and BT-474: 1–3 days. Resistant MCF-7 Tam1, T-47D Tam1 and Tam2: 1–2 weeks, ZR-75-1 Tam1 and Tam2: > 1 week, BT-474 Tam1 and Tam2: 2 weeks. The cells were free of mycoplasma and verified for their authenticity (Technology Centre, Institute for Molecular Medicine Finland, Helsinki, Finland).
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2

Epigenetic Regulation of Prostate and Breast Cancer

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LNCaP, PC3, and DU145 human prostate cancer cells and the human breast cancer cells MDA-MB-231, and BT-474 were obtained from the American Type Culture Collection (Manassaa, VA, USA) and routinely cultured in the appropriate medium. Cells were maintained at 37 °C in a humidified atmosphere of 95% air and 5% CO2.
For the treatment with the demethylating agent 5’-aza-2’ deoxycytidine (Sigma-Aldrich, St Louis, MO, USA), LNCaP, PC3, DU145, MDA-MB-231 and BT-474 cells were treated with 2 or 5 µM (Sigma-Aldrich, St Louis, MO, USA) for 3 days. Treatment was refreshed every 24 h.
Gfi1 methylation analysis were retrospectively evaluated in 44 breast tumor samples and 39 prostate tumor samples from paraffin-embedded blocks. Gfi1 expression was evaluated in 91 prostate tumor samples and 10 prostate normal tissues. Disease-free survival analysis was performed with same cohort in a previous study [17 (link)]. Clinical evolution based on PSA and imaging was recorded. The primary endpoint assessed was disease-specific survival. The study was approved by the Ethics Committee of Hospital Universitario de Getafe (A17-11 of 27 October 2011).
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3

Quantifying Radioactive Tracer Uptake in HER2-Expressing Cancer Cells

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A Cyclone Storage Phosphor System and OptiQuant image analysis software (PerkinElmer, Waltham, MA, USA) were used for measuring the radioactivity distribution on instant thin-layer chromatography (iTLC) strips.
In vitro cell studies were performed using HER2-expressing ovarian cancer SKOV-3 and breast cancer BT-474 cells, both obtained from the American Type Culture Collection (ATCC, Manassas, MA, USA). Ramos lymphoma cells (from ATCC) were used to establish HER2-negative xenografts. Cells were cultured in RPMI1640 medium (Sigma-Aldrich, St. Louis, MO, USA), supplemented with 10% for SKOV-3 or 20% for BT-474, of foetal calf serum, 2 mM L-glutamine, 100 IU/mL penicillin, and 100 mg/mL streptomycin.
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4

Culturing Breast Cancer Cell Lines

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The human breast cancer cell lines MCF7, T47D, ZR-75-1 (ER+/HER2−), BT474 (ER+/HER2+), SKBR3 and JIMT-1 (ER−/HER2+) were obtained from the American Type Culture Collection (ATCC, Manassas, VA, USA). The MCF7, T47D, ZR-75-1, SKBR3 and JIMT-1 cell lines were cultured in an RPMI 1640 medium (Sigma, St. Louis, MO, USA), while the BT474 cell line was cultured in a DMEM medium (Sigma). All culture media were supplemented with 10% fetal bovine serum (FBS) (Sigma), an antibiotic-antimycotic solution (1×) (Sigma), and l-glutamine (2 mM) (Invitrogen GmbH, Karslruhe, Germany). The cultures were maintained in an incubator at 37 °C under 5% CO2.
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5

Cell Line Culture Conditions

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SKOV3, BT474, SKBR3, AU565, MCF7, and A549 cell lines were obtained from American Type Culture Collection (ATCC) and cultured in McCoy’s 5A medium (SKOV3, SKBR3), RPMI-1640 medium (AU565, BT474), or Dulbecco’s modified Eagle medium (MCF7, A549) supplemented with 10% FBS (20% for BT474 cells) (Sigma-Aldrich), 2 mM L-glutamine, 100 IU/mL penicillin, and 100 µg/mL streptomycin in a humidified incubator at 37 °C in 5% CO2 atmosphere.
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6

Characterization of Breast Cancer Cell Lines

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Cell lines were obtained from ATCC (HCC2218, HCC1954, HCC1419, ZR-75-30, AU565, NCI-2170, BT-474, SK-BR-3, NCI-N87, SKOV3, MCF7), Sigma (OE-19), DSMZ (JIMT-1), Cedarlane (ZR-75-1) and AddexBio (MDA-MB-175-VII, MDA-MB-468). Cell lines were authenticated by supplier and were used from source and expanded for a maximum of 20 passages. Cell lines were routinely spot check tested for mycoplasma, all tests were negative. Cell line supplier and catalog numbers are provided in Supplementary Table 14. Trastuzumab (Herceptin®) and pertuzumab (Perjeta®) were purchased from Crown Bio and Xentech, respectively. Zanidatamab was prepared according to standard manufacturing procedures (CMC Bio). A non-specific IgG1 Ab that binds to respiratory syncytial virus (RSV) protein F, palivizumab, was used as a negative control (neg. control or NC) and was produced under standard expression and purification conditions. Human complement serum, baby rabbit complement serum and pooled murine complement serum were obtained from Cedarlane. Mouse strain serum (male and female Balb/c, male and female CB17 SCID) was collected under protocols that were approved by the Animal Care Committee at University of British Columbia.
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7

Culturing Breast Cancer Cell Lines

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The human breast cancer cell lines MCF-7, BT474, MDA-MB-231 and SUM 1315 were obtained from American Type Culture Collection (ATCC, VA, USA). The cells were cultured in a humidified atmosphere of 5% CO2 at 37°C and fed with complete high glucose Dulbecco's modified Eagle medium (DMEM), supplemented with 10% fetal bovine serum, 1% penicillin–streptomycin solution. For 17β-estradiol treatment, MCF-7 and BT474 were cultured in DMEM without phenol red, supplemented with 5% steroid-depleted foetal bovine serum (BI, Israel) for 4 days prior to 17β-estradiol (estrogen, E2, Sigma, USA) treatment.
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8

Breast Cancer Cell Line Cultivation

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The BC cell lines were purchased from ATCC (VA, USA) (Additional file 1: Table S1). MCF7, T47D, BT-549 and MDA-MB-231 were cultured in RPMI (Sigma Aldrich, USA), while BT-474, SkBr3, MDA-MB-468, BT-20 and Hs578T were cultured in DMEM supplemented with 10% fetal bovine serum and 1% penicillin/streptomycin (Sigma Aldrich, USA). The immortalized human mammary epithelial cells hTERT-HME1 (ATCC, USA) were grown in DMEM/F-12 mixture medium supplemented with 10% fetal bovine serum and 1% penicillin/streptomycin (Sigma Aldrich, USA). The human mammary epithelial cells HMEpC were purchased from cell applications (CA, USA) and maintained in defined mammary epithelial cell medium provided by the company (Cell applications, USA).
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9

Culturing Human Glioblastoma and Breast Cancer Cells

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The human glioblastoma U87 and U87-CXCR4 (a U87 cell line stably transfected with human CXCR4) cell lines were provided by Dr. Sridhar Nimmagadda.35 (link) HMFs were kindly provided by Dr. Gary Luker. Two wild-type human breast cancer cell lines, MDA-MB-231, and BT-474 were purchased from American Type Culture Collection (ATCC, Manassas, VA, USA). HMFs and U87, MDA-MB-231, and BT-474 human cancer cells were cultured in 10% fetal bovine serum (FBS, Sigma, St. Louis, MO, USA) supplemented MEM (Mediatech, Manassas, VA, USA), DMEM (Mediatech), RPMI 1640 (Sigma), and ATCC 46-X (ATCC) media, respectively. U87-CXCR4 human cancer cells were maintained in DMEM medium supplemented with 15% FBS, 1 μg/ml puromycin (Sigma-Aldrich), and 300 μg/ml G418 (Mediatech). Cells were maintained at 37 °C in a humidified atmosphere containing 5% CO2.
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10

Breast Cancer Cell Line Characterization

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Breast cancer cell lines of different subtypes utilized for this study are as follows: (i) MCF7 (luminal A, ER+PR+HER2−), (ii) MDA-MB-231 (TNBC, ER−PR−HER2−) were obtained from the American Type Culture Collection (ATCC), Manassas, VA, USA; while (iii) MDA-MB-453 (AR+ER−PR−HER2+FGF+), (iv) BT474 (HER2-enriched, ER−PR−HER2+), and (v) SKBR3 (HER2-enriched) were obtained from M.G.N., SJRI, India [53 (link)]. The phenotypic characterization of cell lines was performed as reported previously [31 (link)]. The MCF7, BT474, MDA-MB-453, and SKBR3 cells were maintained in the Dulbecco’s modified Eagle’s medium (DMEM, Sigma-Aldrich, St. Louis, MO, USA) containing 25 mM of HEPES and 3.6 g/L of sodium bicarbonate supplemented with 10% fetal bovine serum (FBS, Sigma-Aldrich) and 1% antibiotic antimycotic cocktail (Invitrogen, Carlsbad, CA, USA). The MDA-MB-231 cells were cultured in an L-15 medium (Sigma-Aldrich). All cells were maintained in humidified incubators at 37 °C with 5% CO2, and functional cells up to the 10th passage were used for all experiments in this study.
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