title: Higher CO2-insufflation pressure inhibits the expression of adhesion molecules and the invasion potential of colon cancer cells.
abstract: OBJECTIVE
  To investigate the influence of CO(2)-insufflation pressure on adhesion, invasion and metastatic potential of colon cancer cells based on adhesion molecules expression.
  
  
  METHODS
  With an in vitro artificial pneumoperitoneum model, SW1116 human colon carcinoma cells were exposed to CO(2)-insufflation in 5 different pressure groups: 6 mmHg, 9 mmHg, 12 mmHg, 15 mmHg and control group, respectively for 1 h. Expression of E-cadherin, ICAM-1, CD44 and E-selectin was measured at 0, 12, 24, 48 and 72 h after CO(2)-insufflation using flow cytometry. The adhesion and invasion capacity of SW1116 cells before and after exposure to CO(2)-insufflation was detected by cell adhesion/invasion assay in vitro. Each group of cells was injected intraperitoneally into 16 BALB/C mice. The number of visible abdominal cavity tumor nodules, visceral metastases and survival of the mice were recorded in each group.
  
  
  RESULTS
  The expression of E-cadherin, ICAM-1, CD44 and E-selectin in SW1116 cells were changed significantly following exposure to CO(2) insufflation at different pressures (P < 0.05). The expression of E-cadherin, CD44 and ICAM-1 decreased with increasing CO(2)-insufflation pressure. The adhesive/invasive cells also decreased gradually with increasing pressure as determined by the adhesion/invasion assay. In animal experiments, the number of abdominal cavity tumor nodules in the 15 mmHg group was also significantly lower than that in the 6 mmHg group (29.7 +/- 9.91 vs 41.7 +/- 14.90, P = 0.046). However, the survival in each group was not statistically different.
  
  
  CONCLUSIONS
  CO(2)-insufflation induced a temporary change in the adhesion and invasion capacity of cancer cells in vitro. Higher CO(2)-insufflation pressure inhibited adhesion, invasion and metastatic potential in vitro and in vivo, which was associated with reduced expression of adhesion molecules.
authors.affiliation: Department of General Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Minimally Invasive Surgery Center, Shanghai, China. marsnew790620@163.com
authors.forename: Jun-Jun
authors.initials: JJ
authors.lastname: Ma
authors.forename: Bo
authors.initials: B
authors.lastname: Feng
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jian-Wen
authors.initials: JW
authors.lastname: Li
authors.forename: Ai-Guo
authors.initials: AG
authors.lastname: Lu
authors.forename: Ming-Liang
authors.initials: ML
authors.lastname: Wang
authors.forename: Yuan-Fei
authors.initials: YF
authors.lastname: Peng
authors.forename: Wei-Guo
authors.initials: WG
authors.lastname: Hu
authors.forename: Fei
authors.initials: F
authors.lastname: Yue
authors.forename: Min-Hua
authors.initials: MH
authors.lastname: Zheng
mesh_terms: D000818:Animals; D015820:Cadherins / Q000378:metabolism; D002245:Carbon Dioxide / Q000378:metabolism*; D015815:Cell Adhesion Molecules / Q000378:metabolism*; D045744:Cell Line, Tumor; D003110:Colonic Neoplasms / Q000378:metabolism / Q000473:pathology; D019040:E-Selectin / Q000378:metabolism; D006801:Humans; D018960:Hyaluronan Receptors / Q000378:metabolism; D007327:Insufflation; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009361:Neoplasm Invasiveness / Q000473:pathology*; D009362:Neoplasm Metastasis; D009368:Neoplasm Transplantation; D011028:Pneumoperitoneum, Artificial
chemical_list: D015820:Cadherins; D015815:Cell Adhesion Molecules; D019040:E-Selectin; D018960:Hyaluronan Receptors; D018799:Intercellular Adhesion Molecule-1; D002245:Carbon Dioxide