title: The phospho-c-Jun (Ser63) content in mucosa cells under experimental development of gastric cancer.
abstract: OBJECTIVE
  The aim of the study was to determine the phosphorylated c-Jun content and reduced and oxidized glutathione (GSH/GSSG) ratio in gastric mucosa cells during the process of gastric cancer development in rats.
  
  
  METHODS
  Gastric carcinoge-nesis was initiated in 80 white male rats by 10-week replacement of drinking water with 0.01% solution of N-methyl-N´-nitro-N-nitrosoguanidine, at the same time they were redefined on diet containing 5% NaCl. Then the animals were fed with standard vivarium diet till the end of 24(th) week. The gastric mucosa cells were examined at the end of 4(th), 6(th), 8(th), 10(th), 12(th), 18(th), and 24(th) weeks. Sandwich ELISA method was used to determine the content of phospho-c-Jun. The contents of GSH and GSSG were analyzed by spectrofluorymetric method with the use of orthophthalic aldehyde.
  
  
  RESULTS
  At the end of 6(th), 8(th), 10(th) weeks of MNNG and NaCl treatment the gastric mucosa cells were characterized by 4-, 6.3-, 1.9-fold higher content of phospho-c-Jun compared to the control, respectively, and 12, 18 and 24 weeks there was registered a stable increase of phospho-c-Jun content on the average at 3.6-fold compared to control values. Starting from 6(th) week of gastric cancer development an average decrease of GSH/GSSG was 3.4-fold compared with the control.
  
  
  CONCLUSIONS
  During gastric carcinogenesis there was registered the decrease of GSH/GSSG ratio and increased level of phosphorylated c-Jun what points on MAP-kinase cascade activation in prooxidant conditions.
authors.affiliation: Educational and Scientific Centre "Institute of Biology", Taras Shevchenko National University, Kyiv 01601, Ukraine.
authors.forename: M O
authors.initials: MO
authors.lastname: Tymoshenko
authors.affiliation: Educational and Scientific Centre "Institute of Biology", Taras Shevchenko National University, Kyiv 01601, Ukraine.
authors.forename: O O
authors.initials: OO
authors.lastname: Kravchenko
authors.affiliation: Educational and Scientific Centre "Institute of Biology", Taras Shevchenko National University, Kyiv 01601, Ukraine.
authors.forename: O V
authors.initials: OV
authors.lastname: Sokur
authors.affiliation: Educational and Scientific Centre "Institute of Biology", Taras Shevchenko National University, Kyiv 01601, Ukraine.
authors.forename: L I
authors.initials: LI
authors.lastname: Ostapchenko
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D005753:Gastric Mucosa / Q000378:metabolism* / Q000473:pathology; D005978:Glutathione / Q000378:metabolism*; D019803:Glutathione Disulfide / Q000378:metabolism*; D007124:Immunoenzyme Techniques; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism*; D008297:Male; D008769:Methylnitronitrosoguanidine / Q000633:toxicity; D010766:Phosphorylation / Q000187:drug effects; D051381:Rats; D013274:Stomach Neoplasms / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology
chemical_list: D008769:Methylnitronitrosoguanidine; D048031:JNK Mitogen-Activated Protein Kinases; D005978:Glutathione; D019803:Glutathione Disulfide