The human ovarian cancer cell line A2780 (catalog no. 93112519) and the CDDP-resistant cell line A2780cis (catalog no. 93112517) were purchased from European Collection of Cell Cultures (ECACC) General Cell Collection in 2013. Cell lines were shown to be mycoplasma free using the Mycoalert kit from Lonza. A2780 and A2780cis cells [33, 34] were maintained in Roswell Park Memorial Institute (RPMI) 1640 medium (Sigma-Aldrich, Co. R8758) supplemented with 10% heat-inactivated fetal bovine serum (Equitech-bio) and an antibiotic-antimycotic mixed solution (Nacalai Tesque, Inc.). A2780cis cells were maintained in the presence of 1 μM CDDP to maintain CDDP resistance and cultured in the absence of CDDP for 24 h prior to each experiment. For glutamine starvation conditions, RPMI 1640 medium (Sigma-Aldrich, Co. R0883) were used. All cells were grown at 37 °C with 5% CO2.

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