Drug resistance in colorectal cancer cell lines is partially associated with aneuploidy status in light of profiling gene expression

Research output: Contribution to journalJournal articleResearchpeer-review

  • Jiao Guo
  • Shaohang Xu
  • Xuanlin Huang
  • Lin Li
  • Congmin Zhang
  • Qingfei Pan
  • Zhen Ren
  • Ruo Zhou
  • Yan Ren
  • Jin Zi
  • Lin Wu
  • Stenvang, Jan
  • Brünner, Nils
  • Bo Wen
  • Siqi Liu

A priority in solving the problem of drug resistance is to understand the molecular mechanism of how a drug induces the resistance response within cells. Because many cancer cells exhibit chromosome aneuploidy, we explored whether changes of aneuploidy status result in drug resistance. Two typical colorectal cancer cells, HCT116 and LoVo, were cultured with the chemotherapeutic drugs irinotecan (SN38) or oxaliplatin (QxPt), and the non- and drug-resistant cell lines were selected. Whole exome sequencing (WES) was employed to evaluate the aneuploidy status of these cells, and RNAseq and LC-MS/MS were implemented to examine gene expression at both mRNA and protein level. The data of gene expression was well-matched with the genomic conclusion that HCT116 was a near diploid cell, whereas LoVo was an aneuploid cell with the increased abundance of mRNA and protein for these genes located at chromosomes 5, 7, 12, and 15. By comparing the genomic, transcriptomic, and proteomic data, the LoVo cells with SN38 tolerance showed an increased genome copy in chromosome 14, and the expression levels of the genes on this chromosome were also significantly increased. Thus, we first observed that SN38 could impact the aneuploidy status in cancer cells, which was partially associated with the acquired drug resistance.

Original languageEnglish
JournalJournal of Proteome Research
Volume15
Issue number11
Pages (from-to)4047–4059
Number of pages13
ISSN1535-3893
DOIs
Publication statusPublished - 2016

ID: 167221666