title: [Preliminary study on mechanisms of granulocyte macrophage-colony stimulating factor in enhancing impaired colonic anastomotic healing in rats treated with intraperitoneal oxaliplatin].
abstract: OBJECTIVE
  To investigate the mechanisms of local application of granulocyte macrophage-colony stimulating factor (GM-CSF) on healing of colonic anastomoses impaired by intraperitoneal oxaliplatin in rats.
  
  
  METHODS
  Sixty 10-week-old male Wistar rats were made the colonic anastomosis model and randomized into 3 groups, 20 rats in each. The rats received intraperitoneal injection of 5% dextrose in group A, and intraperitoneal injection of 5% dextrose and 10 mL oxaliplatin (25 mg/kg) in group B at 1 day; and 50 microg GM-CSF was injected into the perianastomotic area immediately after operation and 10 mL intraperitoneal oxaliplatin (25 mg/kg) was given at 1 day. The general situation of rats was observed after operation. Anastomotic healing was tested by measuring the bursting pressure in vivo at 2, 3, 5, 7 days. Anastomotic healing score was evaluated by histological staining. Immunohistochemical staining of the anastomotic site was used to determine the amount of collagen type I content.
  
  
  RESULTS
  All animals survived to the experiment end. There was no significant difference in the bursting pressure among 3 groups at 2 and 3 days (P > 0.05); the bursting pressure of group B was significantly lower than that of groups A and C (P < 0.05). There was no significant difference in mononuclear cells infiltration, mucosal epithelialization, submucosa-muscle layer connection degree, and granulation tissue formation between groups A and C at different time points (P > 0.05); groups A and C were significantly better than group B in mucosal epithelialization and granulation tissue formation (P < 0.05). Groups A and C were significantly better than group B in mononuclear cells infiltration at 2 and 3 days, and in submucosa-muscle layer connection degree at 5 and 7 days (P < 0.05). There was no significant difference in collagen type I content among 3 groups at 2 and 3 days (P > 0.05); the content of collagen type I in groups A and C were significantly higher than that in group B (P < 0.05) at 5 and 7 days.
  
  
  CONCLUSIONS
  Local administration of GM-CSF may enhance colonic anastomotic healing by early stimulating infiltration of macrophages and increasing collagen deposition.
authors.affiliation: Department of Medical Oncology, No.1 Central Hospital of Baoding City, Baoding Hebei 071000, PR China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.forename: Yunjun
authors.initials: Y
authors.lastname: Song
authors.forename: Xihua
authors.initials: X
authors.lastname: Jia
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Zhang
authors.forename: Jianmei
authors.initials: J
authors.lastname: Guo
mesh_terms: D000714:Anastomosis, Surgical; D000818:Animals; D024042:Collagen Type I / Q000378:metabolism; D003106:Colon / Q000187:drug effects / Q000601:surgery*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000008:administration & dosage / Q000494:pharmacology*; D007274:Injections, Intraperitoneal; D008297:Male; D009944:Organoplatinum Compounds / Q000008:administration & dosage / Q000494:pharmacology*; D000077150:Oxaliplatin; D011184:Postoperative Period; D011312:Pressure; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D013997:Time Factors; D014945:Wound Healing / Q000187:drug effects*
chemical_list: D024042:Collagen Type I; D009944:Organoplatinum Compounds; D000077150:Oxaliplatin; D016178:Granulocyte-Macrophage Colony-Stimulating Factor