title: [Study of inhibiting and killing effects of transgenic LIGHT human umbilical cord blood mesenchymal stem cells on stomach cancer].
abstract: OBJECTIVE
  To study the inhibition and killing effect of transgenic LIGHT umbilical cord blood mesenchymal stem cells (UCBMSCs) on stomach carcinoma.
  
  
  METHODS
  The LIGHT gene was recombined to construct the transfer plasmid pGC-FU-LIGHT by infusion technique. The 293T cells were co-transfected with the transfer plasmid pGC-FU-LIGHT, the construction plasmid Helper 1.0 and the envelope plasmid Helper 2.0 with the help of lipofectamine 2000 to produce lentiviral particles. Transgenic UCBMSCs(MSC-LIGHT) and empty carrier UCBMSCs (MSC) were obtained. Human gastric cancer cell SGC-7901 was injected into nude mice subcutaneously groin. The model of transplanted human gastric cancer cell SGC-7901 in nude mice was established. Tumorigenesis nude mice were separated into three groups randomly with 5 in each group: MSC-LIGHT group, MSC group, and NS group. Three groups of nude mice were injected around the tumor with MSC-LIGHT, MSC and NS every other day for 3 times. Four weeks later, the transplanted gastric cancer volume was measured. The expressions of LIGHT in the three groups were determined by RT-PCR and ELISA method. The necrosis area in the tumors was calculated under pathological examination.
  
  
  RESULTS
  The average volume of transplanted tumor was(0.45±0.25) cm(3) in MSG-LIGHT group, (0.64±0.36) cm(3) in MSG group, and(1.21±0.79) cm(3) in NS group, and the difference was statistically significant(P<0.05). The LIGHT mRNA was 2.96±0.27, 1.23±0.47, and 0.73±0.10 respectively. The LIGHT protein was(167.89±2.31), (73.22±5.74), and (49.66±5.25) ng/L. The differences were all statistically significant among the three groups(both P<0.01). Pathological examination showed that the necrosis area was largest in MSC-LIGHT group.
  
  
  CONCLUSIONS
  Transgenic UCBMSCs secret LIGHT in a paracrine manner, which has inhibition and killing effects on stomach carcinoma.
authors.affiliation: Department of General Surgery, Qingdao Municipal Hospital, Qingdao 266071, China.
authors.forename: Gui-liang
authors.initials: GL
authors.lastname: Ma
authors.forename: Xin-hong
authors.initials: XH
authors.lastname: Zhu
authors.forename: Shi-ying
authors.initials: SY
authors.lastname: Xuan
authors.forename: Wei-zheng
authors.initials: WZ
authors.lastname: Mao
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D005312:Fetal Blood / Q000166:cytology; D015316:Genetic Therapy; D006801:Humans; D045164:Mesenchymal Stem Cell Transplantation; D059630:Mesenchymal Stem Cells; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D010957:Plasmids / Q000235:genetics; D013274:Stomach Neoplasms / Q000378:metabolism / Q000473:pathology / Q000628:therapy*; D014162:Transfection; D053326:Tumor Necrosis Factor Ligand Superfamily Member 14 / Q000235:genetics* / Q000378:metabolism; D023041:Xenograft Model Antitumor Assays
chemical_list: D053326:Tumor Necrosis Factor Ligand Superfamily Member 14