The human colon adenocarcinoma cell lines, LS180 and Caco-2, were purchased from European Collection of Cell Cultures (ECACC) collections (KAC, Hyogo, Japan). LS180 cells were cultured in Dulbecco’s modified Eagle medium (DMEM) containing 1,500 mg/L glucose (FUJIFILM Wako Pure Chemical, Osaka, Japan) and Caco-2 cells were cultured in DMEM with 4,500 mg/L glucose. In both the cases, the medium was supplemented with heat-inactivated 10% fetal bovine serum (FBS) (Cosmo Bio, Tokyo, Japan). The cultures were maintained at 37°C in a humidified atmosphere with 5% CO2.
The acidic cell culture medium (pH 6.5) was obtained by the addition of 35–37% HCl solution to DMEM containing 1,500 mg/L glucose supplemented with heat-inactivated 10% FBS by measuring pH with a FiveEasy Plus FEP20 pH Meter (METTLER TOLEDO, Tokyo, Japan). LS180 cells were grown for a sufficient time in normal medium and were subsequently maintained in the acidic cell culture medium (pH 6.5) for a few days as described previously with some modifications [26 (link)–28 (link)].
The acidic cell culture medium (pH 6.5) was obtained by the addition of 35–37% HCl solution to DMEM containing 1,500 mg/L glucose supplemented with heat-inactivated 10% FBS by measuring pH with a FiveEasy Plus FEP20 pH Meter (METTLER TOLEDO, Tokyo, Japan). LS180 cells were grown for a sufficient time in normal medium and were subsequently maintained in the acidic cell culture medium (pH 6.5) for a few days as described previously with some modifications [26 (link)–28 (link)].
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