title: [Expression of long non-coding RNA associated with radiotherapy-resistance in colorectal cancer cell lines with different radiosensitivity].
abstract: OBJECTIVE
  To screen long non-coding RNA (lncRNA) associated with radiosensitivity in colorectal carcinoma cell lines.
  
  
  METHODS
  Colony formation assay was performed in colorectal cancer cell lines HT29, SW480, RKO, Lovo and HCT116 after irradiation with different radiation doses. Radiation sensitivity of these 5 cell lines was detected through survival fraction at 2 Gy (SF2 value). High-throughput lncRNA chip was used to screen lncRNA genes with expression differences more than 2 folds among SW480, RKO and Lovo. Further experiment on the expression differences of lncRNAs selected was conducted by realtime PCR.
  
  
  RESULTS
  The radiosensitivity order of these 5 cell lines from low to high (SF2 value from high to low) was HT29 (0.83 ± 0.03), SW480 (0.69 ± 0.02), RKO(0.53 ± 0.02), Lovo (0.47 ± 0.05), HCT116 (0.32 ± 0.03) (P < 0.01). Five lncRNAs associated with radiation sensitivity were screened. Among them, expression levels of R05532, NR_015441, and NR_033374 were positively correlated with radiation resistance(all P < 0.01), and expression levels of the other 2 lncRNAs, NR_073156 and AA745020, were not correlated with radiation resistance of colorectal cancer cells (both P>0.05).
  
  
  CONCLUSIONS
  lncRNA R05532, NR_015441 and NR_033374 may be used as the predictive marker of radiosensitivity of colorectal cancer cells. Higher expression of these genes shows radiation resistance.
authors.affiliation: Department of Colorectal Surgery, Changhai Hospital, The Second Military Medical University, Shanghai 200433, China. fugang416@126.com.
authors.forename: Xiaowen
authors.initials: X
authors.lastname: Xu
authors.forename: Jie
authors.initials: J
authors.lastname: Yuan
authors.forename: Zhigui
authors.initials: Z
authors.lastname: Zuo
authors.forename: Zhiqi
authors.initials: Z
authors.lastname: Yu
authors.forename: Yongming
authors.initials: Y
authors.lastname: Liu
authors.forename: Chuangang
authors.initials: C
authors.lastname: Fu
mesh_terms: D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000235:genetics* / Q000532:radiotherapy; D006801:Humans; D020411:Oligonucleotide Array Sequence Analysis; D062085:RNA, Long Noncoding / Q000235:genetics*; D011836:Radiation Tolerance
chemical_list: D062085:RNA, Long Noncoding