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2 protocols using blasticidine s

1

Tetracycline-Inducible SH-SY5Y Cell Line

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A pcDNA6/TR vector (Thermo Fisher Scientific) was introduced into SH-SY5Y cells for high-level expression of the tetracycline repressor protein. pcDNA6/TR vector was linearized with FspI restriction enzyme (NEB), purified with PCR Clean-up (Macherey-Nagel) and used for the transfection of SH-SY5Y cells using Xfect transfection reagent (TaKaRa) according to manufacturer's instructions. For 48 h, cells were exposed to selection medium containing tetracycline-free FBS (Gibco) and blasticidine S at 5 µg mL -1 (Sigma-Aldrich). Single-cell cloning of resistant cells was performed with dilution plating, followed by cell sorting for the homogenous expression of repressor proteins. To test the efficiency of repression, cells were transfected with a plasmid containing eGFP under a Tet operator. As the resulting SH-SY5Y-TR-eGFP cells exhibited no residual eGFP expression upon the addition of 1 µg mL -1 of doxycycline (Sigma-Aldrich), the original SH-SY5Y-TR cells were selected for FlpIn SH-SY5Y-TR-FRT cell line development. To introduce the FRT recombination site into the cells, pFRT/ lacZeo was linearized with ApaI (NEB) restrictase, purified with PCR Clean-up and transfected into SH-SY5Y-TR cells (Xfect, TaKaRa). Forty-eight hours later, cells were subjected to a
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2

Culturing Diverse Cell Lines for Experiments

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293T, A2058 and GAK cells were obtained from Japanese Collection of Research Bioresources Cell Bank (Osaka, Japan). SKMEL28, G361, HMV1 and CRL1579 cells were obtained from the Cell Resource Center for Biomedical Research, Institute of Development, Aging and Cancer, Tohoku University, Japan. HeLa229 and U2OS cells were obtained from American Type Culture Collection. Cells were cultured in Dulbecco's Eagle's medium (DMEM; Sigma, St. Louis, MO, USA) supplemented with 10% fetal bovine serum (HyClone, Logan, UT, USA). Human Epidermal Melanocyte cells (Invitrogen) were cultured in Medium 254 (Invirogen, Portland, OR, USA) supplemented with Human Melanocyte Growth supplement (Invitrogen). All cells were cultured at 37°C in a humidified incubator under 5% CO2. FLAG-PITX1 stable expression clones were maintained in DMEM supplemented with 10% FBS and G418 (HeLa229 and U2OS 500 μg/ml, 293T 600 μg/ml; Calbiochem, La Jolla, CA, USA). FLAG-ZCCHC10 and PITX1 stable co-expression A2058 clones were maintained in DMEM supplemented with 10% FBS and G418 (300 μg/ml, Calbiochem) and blasticidine S (3 μg/ml, sigma). All Cell lines detected as Mycoplasma-free by MycoAlert mycoplasma detection kit (Lonza, Walkersville, MD, USA) and no more than 20 passage from the validated stocks.
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