title: [Study of the effect of LIG4 on the radiosensitivity enhancement of rectal cancer cells by curcumin].
abstract: OBJECTIVE
  To investigate the function of repair gene LIG4 in radiosensitivity enhancement of rectal cancer cells by curcumin.
  
  
  METHODS
  Human rectal cancer cells HT-29 were cultured in normal. LIG4-overexpression HT-29 cells and blank control plasmid HT-29 cells were established by gene transfection. Both kind of HF-29 cells were further randomly divided into curcumin group, radiotherapy group, curcumin plus radiotherapy group (combined group) and control group. The growth inhibition and apoptosis of cells were detected by MTT and Annexin V/PI respectively. Change of tumor volume was observed in nude mouse xenograft model, and the apoptosis of tumor cells was analyzed by TUNEL.
  
  
  RESULTS
  Regarding blank control plasmid HT-29 cells, the growth inhibition rate and apoptosis rate in combined group were significantly higher than those in radiotherapy group(all P<0.05); tumor volume of nude mouse in combined group was significantly smaller than that in radiotherapy group, and the apoptotic index in combined group was significantly higher than that in radiotherapy group (all P<0.05). However, regarding LIG4-overexpression HT-29 cells, the growth inhibition rate and apoptosis rate were not significantly different between combined group and radiotherapy group(all P>0.05); the tumor volume of nude mouse and the apoptotic index were also not significantly different between combined group and radiotherapy group (all P>0.05).
  
  
  CONCLUSIONS
  Down-regulation of LIG4 is an important mechanism of radiosensitivity enhancement of rectal cancer cells by curcumin.
authors.forename: Yihuan
authors.initials: Y
authors.lastname: Song
authors.affiliation: Department of Anorectal Surgery, Hangzhou Third People's Hospital, Hangzhou 310009, China. Yangguangen88@126.com.
authors.forename: Guangen
authors.initials: G
authors.lastname: Yang
authors.forename: Jianming
authors.initials: J
authors.lastname: Qiu
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.forename: Xueping
authors.initials: X
authors.lastname: Wang
mesh_terms: D000818:Animals; D017209:Apoptosis; D002452:Cell Count; D003474:Curcumin; D015536:Down-Regulation; D019073:HT29 Cells; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D010957:Plasmids; D011836:Radiation Tolerance; D012004:Rectal Neoplasms; D014162:Transfection
chemical_list: D003474:Curcumin