Oncomedicine 2017; 2:111-120. doi:10.7150/oncm.20045 This volume

Research Paper

MicroRNA Profiling of Oxaliplatin-Resistant HCT116 Colorectal Cancer Cells

Bustamin Kosmo1, Kee Wah Lee2, Muhammad Sufyan bin Masroni2, Sharne Leong1, Wei Ern Ong1, Hong Lyn Wong1, Yi Yun Chang1, Evelyn SC Koay1, 2, Sai Mun Leong2, Karen Tan1✉

1. Department of Laboratory Medicine, National University Hospital, Level 3 NUH Main Building, 5 Lower Kent Ridge Road, Singapore 119074, Singapore;
2. Department of Pathology, Yong Loo Lin School of Medicine, National University of Singapore, Level 3 NUH Main Building, 5 Lower Kent Ridge Road, Singapore 119074, Singapore.

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Kosmo B, Lee KW, Masroni MSb, Leong S, Ong WE, Wong HL, Chang YY, Koay ESC, Leong SM, Tan K. MicroRNA Profiling of Oxaliplatin-Resistant HCT116 Colorectal Cancer Cells. Oncomedicine 2017; 2:111-120. doi:10.7150/oncm.20045. Available from /v02p0111.htm

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Aim: To investigate the impact of oxaliplatin resistance on the cellular characteristics and miRNA expression pattern in colorectal cancer cells.

Methods: A stable oxaliplatin-resistant colorectal cancer HCT116 cell line was established by exposure to increasing doses of oxaliplatin. Alterations in cytotoxicity, migration, invasion and tumorsphere formation were assessed by MTS assay, modified Boyden chamber assay, and colonosphere assay respectively. The miRNAome of the oxaliplatin-resistant HCT116 cells was analyzed using the TaqMan PCR Human miRNA array. Upregulated miRNAs from the PCR array were validated by real-time reverse transcription-quantitative PCR (RT-qPCR).

Results: Oxaliplatin-resistant HCT116 cells exhibited higher migration, invasion and tumorsphere formation compared to parental oxaliplatin-sensitive HCT116 cells. The oxaliplatin-resistant cells showed a distinct miRNA expression profile compared to the parental cells. The expression of miR-601, miR-222, miR-202 and miR-25 were verified by RT-qPCR to be increased in resistant cells. Bioinformatics analyses were used to identify potential target mRNAs of these 4 miRNAs.

Conclusion: Results presented in this study provide evidence that oxaliplatin-resistance induces phenotypic changes in colorectal cancer and alterations in miRNA expression. Functional studies on the miRNAs and their target mRNA may enable the discovery of functional pathways to chemoresistance in colorectal cancer.

Keywords: Colorectal cancer, oxaliplatin, chemoresistance, miRNA profiling, HCT116.