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6 protocols using essential 8 flex

1

Hepatocyte Differentiation of Stem Cells

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The human embryonic stem cell (hESC) line H9 (WA09) was purchased from WiCell Research Institute (Madison, 15 WI) and kept according to supplier’s instructions as feeder-free cultures on Matrigel (BD biosciences)-coated plates in Essential 8 (or Essential 8 Flex) (Thermo fisher). BJ1 iPSCs were made in-house and kept on Matrigel-coated plates at ±8.75 × 104 cells/cm2 in mTeSR medium (Stem Cell Technologies)65 (link). Cells were differentiated towards the hepatocyte lineage as described by our group before65 (link), with some optimizations. Briefly, single-cell suspensions of H9/ BJ1 cells (using accutase) were plated on Matrigel-coated plates at ±8.75 × 104 cells/cm2 in mTeSR medium (Stem Cell Technologies). When cells reached 70–80% confluency, differentiation was started using the previously described cytokine regimes and was stopped after 20 days of differentiation. All cytokines were purchased from Peprotech (NJ). Differentiation medium was supplemented with 0.6% DMSO during the first 12 days of the culture and with 2% DMSO during the last 8 days of differentiation. Use of embryonic stem cells and iPSCs for research was approved by the “Commissie Medische Ethiek,” UZ KU Leuven/Onderzoek U.Z. Gasthuisberg, Herestraat 49, B 3000 Leuven, under file number S52426
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2

Rhesus CD47 Overexpressing iPSCs

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Human B2M/CIITA/ iPSCs overexpressing rhesus CD47 (rhCD47) were cultured on diluted feeder-free Matrigel (hESC qualified, BD Biosciences)–coated 6-well plates in Essential 8 Flex medium (Thermo Fisher) and transduced to express Fluc as described above.
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3

Cardiomyocyte Differentiation of RBM20 Mutant iPSCs

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Parental iPSCs and iPSCs harboring the homozygous P633L or R634Q mutation in RBM20 were previously generated and characterized24 (link). Cells were maintained on vitronectin (A31804, ThermoFisher) coated plates with Essential 8™ Flex (A2858501, ThermoFisher) medium and passaged with Versene (15040066, ThermoFisher). Cardiomyocyte differentiation was initiated by addition of 8 μM CHIR99021 (72054, STEMCELL Technologies) in RPMI-1640 medium supplemented with B27 without Insulin (RPMI-Insulin, A1895601, ThermoFisher). After 24 h, 1 volume of RPMI-Insulin was added and after 72 h, medium was changed to RPMI-Insulin with 2 μM Wnt-C59 (5148, Tocris). At day 5 and 7, medium was changed to RPMI-Insulin and at day 9 to RPMI with full B27 supplement (RPMI+Insulin, 17504044, ThermoFisher). At day 11, medium was changed to RPMI+Insulin without glucose and addition of 5 mM DL-lactate. At day 14, RPMI+Insulin was added and at day 16, cells were passaged with TrypLE10x (A1217701, ThermoFisher) and RPMI+Insulin supplemented with 10% knock-out serum replacement (10828028, ThermoFisher) and 1.66 μM Thiazovivin (72252, StemCell Technologies). One day after passaging, the medium was changed to RPMI+Insulin with subsequent medium exchange every 3 days. Passaging was done every 2–3 weeks.
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Culturing and Maintaining Human iPSCs

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Human iPSCs (hiPSC-L1) were cultured on six well plates coated with growth factor-reduced Matrigel (Corning) in an incubator at 37°C, 5% CO2. Stem cells were maintained in Essential 8 Flex medium (E8 Flex; Thermo Fisher Scientific) containing 1% penicillin/streptomycin until ∼70% confluency was reached, at which point cells were split into new wells using ReLeSR passaging reagent (Stem Cell Technologies) with 2 µM ROCK inhibitor (Thiazovivin/TZV; Selleck Chemicals) added to prevent cells from undergoing apoptosis while in suspension. All hiPSC lines were periodically validated for pluripotency and genomic stability.
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5

Culturing Human Embryonic Stem Cells

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Human ESCs (WA25 hESCs and genomically edited cell lines based on the WA25 background, passage 13–55) were cultured in Essential 8 Flex (E8f) medium (Thermo Fisher) supplemented with 100 µg/mL Normocin (Invivogen) (hereafter, E8fn medium) on truncated recombinant human Vitronectin-N (Thermo Fisher)-coated Nunclon Delta surface-treated 6-well plates (Thermo Fisher) according to an established protocol58 (link). At 60%–80% confluency or every 3 or 4 days, the cells were passaged at a split ratio of 1:100–1:10 into 2–4 wells of a 6-well plate using 0.5 mM Ethylenediaminetetraacetic acid (EDTA) in Dulbecco’s phosphate-buffered saline (DPBS). 1X RevitaCell (Thermo Fisher) was supplemented in the E8fn medium for 1 d after passaging for increased viability. The WA25 hES cell line was acquired from the WiCell Research Institute. For additional validation and testing information, refer to the cell line webpage: https://www.wicell.org/home/stem-cell-lines/catalog-of-stem-cell-lines/wa25.cmsx.
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6

Inducing Hepatocyte-like Cells from iPSCs

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The normal donor SIGi001 iPSC0028 was purchased from Sigma. Both cell lines were genetically modified, as previously described, 9, (link)18 (link) to incorporate a doxycycline inducible cassette encoding for HNF1A, PROX1, and FOXA3 with or without PGC1A, SIRT1, and activated AMPK (respectively named HC3x and HC6x). PSCs were maintained according to supplier's instructions as feeder-free cultures on Matrigel (BD biosciences)-coated plates in Essential 8 Flex (Thermo Fisher). Cells were differentiated toward the hepatocyte lineage as described by our group before. 9 (link)
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