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3 protocols using skeletal muscle growth medium

1

Cultivation and Transfection of Myoblast and HEK293T Cells

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C2C12 mouse myoblasts and HEK293T cells were cultivated in Dulbecco’s modified Eagle Medium (DMEM; Biochrom AG) supplemented with 10% fetal calf serum (FCS; Biochrom AG), 2 mM L-glutamine and penicillin (100 units/ml)/streptomycin (10 µg/ml) (PAA) at 37°C and 10% or 5% CO2, respectively. Immortalised human myoblasts were cultured in skeletal muscle growth medium (Provitro) supplemented with supplement mix (Provitro), 50 ng/ml amphotericin, 50 µg/ml gentamicin, 10% FCS, 2 mM L-glutamine and penicillin (100 units/ml)/streptomycin (10 µg/ml) at 37°C and 5% CO2.
For transient transfection of HEK293T cells polyethylenimine (PEI; Sigma-Aldrich) was used. C2C12 cells were transfected using Lipofectamine2000 (Invitrogen) according to manufacturer’s instructions. For siRNA-mediated knockdown of human IRS4 Lipofectamine RNAiMAX (Invitrogen) was used according to manufacturer’s instructions; as control non-targeting siRNA was used (for detailed information see Supplementary Methods). In short, cells were transfected with 25 nM siRNA on two consecutive days and experiments were performed 72 h post-transfection.
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2

Myoblast Differentiation Protocol

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Myoblasts (passage numbers between 3 and 6) were cultured in Skeletal Muscle Growth Medium (Provitro) supplemented with 10% foetal bovine serum (Provitro) and kept in an incubator at 37 °C with 5% CO2. Differentiation was induced by treating cells with differentiation medium consisting of Dulbecco’s Modified Eagle’s Medium (DMEM) supplemented with GlutaMAX and 2% horse serum (all from Gibco®) for 7 days. The medium was changed every 2 days.
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3

Culturing Diverse Cell Lines for Experiments

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HEK293T, MCF7, and C2C12 cells were grown in DMEM (Biochrom AG) supplemented with 10% fetal calf serum (FCS; Biochrom AG), 2 mM l-glutamine, and penicillin (100 U/ml)/streptomycin (10 µg/ml) (PAA Laboratories) at 37°C and 10% (C2C12) or 5% CO2. Immortalized human myoblasts were cultured in skeletal muscle growth medium (Provitro) supplemented with supplement mix (Provitro), 50 ng/ml amphotericin, 50 µg/ml gentamicin, 10% FCS, 2 mM l-glutamine, and penicillin (100 U/ml)/streptomycin (10 µg/ml) at 37°C and 5% CO2. hFOBs (1.19) were cultured in a 1:1 mixture of DMEM and Ham’s F12 medium supplemented with 10% FCS, 2 mM l-glutamine, penicillin (100 U/ml)/streptomycin (10 µg/ml), and 0.3 mg/ml G418 (Biochrom AG) at 34°C with 5% CO2 to keep them in a proliferative state. HUVECs were a kind gift from M. Lorenz and V. Stangl (Charité Universitätsmedizin, Berlin, Germany) and cultured on gelatin-coated tissue culture ware in M199 medium supplemented with 20% FCS, 50 µg/ml endothelial cell growth supplement (Corning), 25 µg/ml heparin, 2 mM l-glutamine, and penicillin (100 U/ml)/streptomycin (10 µg/ml) at 37°C and 5% CO2. HUVECs were used at passage 3 in all experiments. Unless stated otherwise, all cells were starved for 5 h prior to stimulation with their respective growth medium, without FCS supplement, containing 2 mM l-glutamine and penicillin/streptomycin.
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