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5 protocols using mef 1 nucleofector kit

1

Mammalian Expression of Rat MBL-A and Human LH3

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Mammalian expression vectors pcDNA3 (Invitrogen) encoding a untagged or a carboxy-terminally FLAG-tagged rat MBL-A [23] (link) and pcDNA3 containing the full length human LH3 or the amino-terminal part of LH3 to the amino acid 290 with a LH3 signal peptide and a c-Myc-tag at the amino-terminus [5] (link),[24] (link) were transfected into LH3−/− knockout, LH mutant and wild type MEFs using a MEF 1 Nucleofector Kit and Amaxa Nucleofector technology (Lonza). The following day the culture medium was changed to serum free DMEM, penicillin/streptomycin, and 50 µg/ml ascorbic acid, and the cells were cultured for 48 h. The medium was collected and concentrated by Amicon Ultra centrifugal filters (10 kDa MWCO, Millipore).
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Characterization of Wild-type and IRBIT Knockout Mouse Embryonic Fibroblast Cells

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Wild-type (WT) or IRBIT knockout (KO) mouse embryonic fibroblast (MEF) cells have been described previously (Kawaai et al., 2015 (link)). HeLa cells (RRID:CVCL_0030) were obtained from the RIKEN BioResource Center (Ibaraki, Japan) where their identity was checked by Short Tandem Repeat (STR) polymorphism profiling analysis. MEF cells and HeLa cells were cultured at 37°C with 5% CO2 in Dulbecco’s modified essential medium (DMEM, Nacalai Tesque) supplemented with 10% (vol/vol) FBS, 50 units/mL penicillin, and 0.05 mg/mL streptomycin (Nacalai Tesque). None of the used cell lines were in the list of commonly misidentified cell lines maintained by the International Cell Line Authentication Committee. All cell lines were checked for mycoplasma contamination.
HeLa cells were transfected, according to manufacturer’s instructions, with X-treamGENE HP reagent (Roche Diagnostics) for plasmids and with Lipofectamine 2000 (Thermo Fisher Scientific) for siRNA. For MEF cells, electroporation was performed using MEF 1 Nucleofector Kit (VPD-1004, Lonza) according to manufacturer's instructions.
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3

Hedgehog Signaling Assays in Cell Lines

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ASZ001 (ASZ, gender: female) BCC cells were cultured in 154CF media (Life Technologies) supplemented with 2% chelated fetal bovine serum, Human Kerytinocyte Growth Supplement (Thermo Fisher), Penn-strep, and 0.05mM CaCl2. Experiments assaying hedgehog signaling carried out in serum-free conditions.
NIH-3T3 (gender: male) and HEK-293T (gender: female) cells were cultured in DMEM supplemented with 10% fetal bovine serum (FBS). Experiments assaying hedgehog signaling were carried out in 0–0.2% FBS supplemented with Smoothened Agonist (SAG, Sigma).
Mammalian cell transfection performed using FuGENE® 6 Transfection Reagent (Promega), Lipofectamine® LTX with Plus™ Reagent (Thermo Fisher), and MEF 1 Nucleofector® Kit (Lonza) per manufacturer protocol. Transient transfection mammalian expression vectors are included below. Stable expression produced by piggybac transposition.
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Efficient MEF Transfection with Nucleofector

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MEFs were transfected using the Amaxa Nucleofector device (Lonza), program T-020, MEF 1 nucleofector kit (Lonza VPD-1004), and 2 μg DNA, according to manufacturer’s instructions. For all transfections, efficiency was monitored by qPCR.
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5

Generation and Immortalization of Mouse Embryonic Fibroblasts

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Primary mouse embryonic fibroblasts (MEFs) were generated from 13.5 days old C57BL/6 Neil1-/-/2-/- embryos (Gran et al, manuscript in preparation). Limbs were removed from embryos, the tissue was chopped into small pieces and cell suspension was made by pipetting vigorously. MEFs were grown in DMEM medium (Gibco) supplemented with 10% fetal bovine serum (FBS, Sigma), 2 mM glutamine (GlutaMAX, Gibco) and 1x penicillin/streptomycin (Gibco). Cells grown for 4–5 days were frozen at passage 2 in DMEM medium with 20% FBS/10% DMSO. Neil1-/-Neil2-/- MEFs displayed the same proliferation rate as wild type MEFs. Experimental procedures were approved by the Norwegian Animal Research Authority. MEFs were immortalized by frequent passaging, using the 3T3 protocol as described previously [20 (link)]. Neil1-/-Neil2-/- and Ogg1-/- MEFs, described previously [12 (link)], were cultured in a humidified incubator at 10% CO2 in high-glucose DMEM containing GlutaMAX (Invitrogen) supplemented with 10% fetal bovine serum (GE Healthcare). MEFs were electroporated using an Amaxa Nucleofector 2B device and MEF 1 Nucleofector® kit (Lonza, Cat. #VPD-1004) using the T-020 setting as per the manufacturer’s instructions and 3–4 μg of DNA per 1.0 x 106 to 1.5 x 106 cells.
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