title: Cytopathic effects of toxogenic strains of Helicobacter pylori on different cell lines.
abstract: OBJECTIVE
  Many virulence factors are involved in the pathomechanism of infection caused by Helicobacter pylori. Toxins such as vacuolating cytotoxin, encoded by the vacA gene and the immunogenic protein cagA, encoded by the cagA gene (cytotoxin-associated gene) are major factors conferring the property of virulence. The current study is aimed at isolation of H. pylori and separation of its toxin from antral biopsies of patients.
  
  
  METHODS
  The following cell lines were used to demonstrate the cytopathic effect (CPE) of the separated toxin: African green monkey kidney (Vero), baby hamster kidney, human lung carcinoma (LLC-MK2), and human epithelial.
  
  
  RESULTS
  H. pylori was isolated from 27 out of 45 patients (60%) selected for the study. CPE of H. pylori toxin was highly significant on Vero cells than other cell lines used as it reached a high dilution titer of toxin (1/16) in 13 isolated strains (48.15%). No significant difference in CPE of toxin in different dilutions was detected among other cell lines used in different groups. H. pylori toxin could be detected by sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis as a distinct band with a molecular weight ranging between 66 and 97 kDa and closely related to 87 kDa.
  
  
  CONCLUSIONS
  H. pylori vacuolating cytotoxin plays a vital role in the pathogenesis of gastroduodenal diseases (gastritis, gastric ulcer, duodenal ulcer, and gastric cancer). The Vero cell lines were found to be the most suitable form of tissue culture when compared with other cell lines used in our study for demonstrating the activity of H. pylori toxin.
authors.forename: K Lakshmana
authors.initials: KL
authors.lastname: Gowda
authors.affiliation: Department of Clinical Laboratory, College of Applied Medical Sciences, Riyadh, Kingdom of Saudi Arabia, .
authors.forename: Mohammed Ali M
authors.initials: MA
authors.lastname: Marie
authors.forename: James
authors.initials: J
authors.lastname: John
authors.forename: C S
authors.initials: CS
authors.lastname: Pradeep
authors.forename: Khaled Homoud M
authors.initials: KH
authors.lastname: Dabwan
authors.forename: G
authors.initials: G
authors.lastname: Sangeetha
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000378:metabolism* / Q000633:toxicity*; D002460:Cell Line; D002522:Chlorocebus aethiops; D006224:Cricetinae; D003581:Cytodiagnosis / Q000379:methods*; D016480:Helicobacter pylori / Q000254:growth & development* / Q000378:metabolism*; D006801:Humans
chemical_list: D001426:Bacterial Proteins; C074689:VacA protein, Helicobacter pylori