MicroRNA regulation of DNA repair gene expression in 4-aminobiphenyl-treated HepG2 cells

Lin Chen Huan, Jong C. Wu, Bin Hao Chiou, Chin Hui Chen, Nianhan Ma, Chi Yao Chang, Yi Kuang Tsen, Ssu Ching Chen

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


We examined the role of miRNAs in DNA damage response in HepG2 cells following exposure to 4-aminobiphenyl (4-ABP). The arylamine 4-ABP is a human carcinogen. Using the Comet assay, we showed that 4-ABP (18.75-300. μM) induces DNA damage in HepG2 cells after 24. h. DNA damage signaling pathway-based PCR arrays were used to investigate expression changes in genes involved in DNA damage response. Results showed down-regulation of 16 DNA repair-related genes in 4-ABP-treated cells. Among them, the expression of selected six genes (UNG, LIG1, EXO1, XRCC2, PCNA, and FANCG) from different DNA repair pathways was decreased with quantitative real-time PCR (qRT-PCR). In parallel, using the miRNA array, we reported that the expression of 27 miRNAs in 4-ABP-treated cells was at least 3-fold higher than that in the control group. Of these differential 27 miRNAs, the most significant expression of miRNA-513a-5p and miRNA-630 was further validated by qRT-PCR, and was predicted to be implicated in the deregulation of FANCG and RAD18 genes, respectively, via bioinformatic analysis. Both FANCG and RAD18 proteins were found to be down-regulated in 4-ABP-treated cells. In addition, overexpression and knockdown of miRNA-513a-5p and miRNA-630 reduced and increased the expression of FANCG and RAD18 proteins, respectively.Based on the above results, we indicated that miRNA-513a-5p and miRNA-630 could play a role in the suppression of DNA repair genes, and eventually lead to DNA damage.

Original languageEnglish
Pages (from-to)69-77
Number of pages9
StatePublished - 1 Aug 2014


  • DNA damage
  • DNA repair
  • MiRNA-513a-5p
  • MiRNA-630


Dive into the research topics of 'MicroRNA regulation of DNA repair gene expression in 4-aminobiphenyl-treated HepG2 cells'. Together they form a unique fingerprint.

Cite this