Establishment of Oxaliplatin-resistant HCC Cell Lines

MHCC97H (97H), a high-metastatic human HCC cell line, was established in Liver Cancer Institute of Zhongshan Hospital [15 (link)]. MHCC97H cells from the 12th to the 15th passage were used in our experiments. Hep3B, a low metastatic potential HCC cell line was purchased from the America Type Culture Collection(ATCC, HB 8064™). The oxaliplatin-resistant HCC cell lines MHCC97H–OXA and Hep3B–OXA selected at a 25umol/L concentration of oxaliplatin were successfully established from MHCC97H and Hep3B, by exposing cells to gradually increasing oxaliplatin (Sigma, St. Louis, MO, USA) from 2 umol/L to 25umol/L in our laboratory [14 (link)]. The IC50 value of surviving HCC cells treated with oxaliplatin was about 10-fold as high as that of their parental cells (Additional file 1: Figure S1).MHCC97H and MHCC97H–OXA were cultured in Dulbecco’s Modified Eagle’s Medium (DMEM, Gibco Invitrogen, Carlsbad, CA, USA) supplemented with 10% fetal bovine serum (FBS, Life Technologies/Gibco). Hep3B and Hep3B–OXA cells were cultured in minimum essential medium (MEM) supplemented with 10% fetal bovine serum. Cells(1 × 10⁶) were seeded into 25 cm culture flask for 72 h per passage.