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3 protocols using revco ultima 2

1

Cell Culture of MLO-A5 Osteocytes

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MLO-A5 cells were generously donated by the Bonewald Laboratory (University of Missouri-Kansas City) and were cultured in α-MEM containing nucleotides and L-glutamine (Life Technologies, Grand Island, NY) [38 (link)]. Media was supplemented with 5% fetal bovine calf serum (FCS) and 5% supplemented bovine calf serum (BCS) purchased from ThermoScientific Hyclone (Rockford, IL). Cells were plated into 100 mm2 culture plates (BD Biosciences, San Jose, CA) in a Revco Ultima II tissue culture incubator at 37°C and 5% CO2 (ThermoScientific, Ashenville, NC) and split every three days.
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Hypoxia and Normoxia Effect on Renal Cells

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hRCs were isolated and cultured using the established protocol in our laboratory (George et al., 2016 (link); Yim et al., 2019 (link)). The hRCs were cultured in GM containing a mixture of two types of media (1:1). One is DMEM/High glucose containing 10% FBS and 1% PS, and the other is keratinocyte medium (Thermo Fisher Scientific, Rochester, NY) supplemented with bovine pituitary extract, epidermal growth factor, 1% FBS, 0.08% insulin-transferrin-selenium (ITS; Lonza, Basel, Switzerland), and 1% PS. hRCs were seeded in 48-well plates (5,000 cells per well) and incubated in hypoxia (1% O2) or normoxia (21% O2) for 3 days with GM (positive control), SFM (negative control), CM (4×), single protein (ANGPTL4, follistatin, HGF, uPAR, or VEGF) or RPC (ANGPTL4 + follistatin + HGF + uPAR + VEGF) (Figure 1). For the normoxic culture, cells were cultured in a regular cell culture incubator with 21% O2 and 5% CO2. For the hypoxic culture, seeded cells were transferred in a hypoxia C-chamber (BioSpherix, Parish, NY) inside a standard CO2 incubator (Revco Ultima II; Thermo Fisher Scientific) with a compact gas oxygen controller (ProOx P110; BioSpherix) to maintain oxygen concentration at 1 and 5% of CO2 (Yim et al., 2019 (link)).
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3

Hypoxia-Reoxygenation Rat Kidney Cell Assay

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The rat kidney tubular epithelial cell line (NRK-52E) was obtained from the Food Industry Research and Development Institute (Hsinchu, Taiwan). Cells were maintained in DMEM containing 4.5 g/L glucose (Invitrogen) with 10% FBS at 37°C in a 5% CO 2 atmosphere and passaged twice a week. Cells were plated in 35-mm dishes (Corning Inc., Corning, NY, USA) at a density of 1 × 10 6 cells/dish, reached ~90% confluence by the next day, and were used for experiments. For hypoxia experiments, cells were treated in a hypoxia C-chamber (BioSpherix, Lacona, NY, USA) inside a standard CO 2 incubator (Revco Ultima II; Thermo Fisher Scientific) with a compact gas oxygen controller (ProOx P110; BioSpherix) to maintain oxygen concentration at 1% by introducing a gas mixture of 95% N 2 and 5% CO 2 for 24 h. After hypoxic treatment, the cells were washed with PBS (Gibco) and cultured with NM or iPSC-CM in 95% O 2 /5% CO 2 condition for 6 h (reoxygenation). Control cells were incubated in a regular cell culture incubator with 21% O 2 . At the end of the study, cells were monitored morphologically or harvested with indicated buffers to collect cell lysates for biochemical analyses.
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