title: Molecular detection of host cytokine expression in Helicobacter pylori infected patients via semi-quantitative RT-PCR.
abstract: BACKGROUND
  Helicobacter pylori (Hp) is a bacterium recognised as a main causative agent for the development of chronic active gastritis, peptic ulcer disease, gastric adenocarcinoma and primary gastric lymphoma.
  
  
  OBJECTIVE
  Determination of the levels of IFN-gamma (pro-inflammatory) and IL-4 (anti inflammatory) cytokine expression as indicators of Th1 and Th2 immune responses in gastric cancer (GC) and non gastric cancer (Non GC) dyspeptic patients by gene specific RT-PCR.
  
  
  METHODS
  Biopsy specimens were collected from three groups of gastric cancer (GC=18), non ulcer dyspepsia (NUD = 38) and peptic ulcer patients (PUD=20). Total RNA was extracted and complementary DNA was synthesised. PCR amplification was performed for HPRT, IFN-gamma and IL-4 cytokines and the intensity of each band was measured by densitometry and normalized against HPRT expression as a house keeping gene.
  
  
  RESULTS
  Comparison of the results from different groups of patients indicated that IFN-gamma gene expression was similar in nonGC dyspeptic patients (NUD and PUD groups; 3.38 +/- 0.57,3.43 +/- 0.41, respectively) whereas, in GC patients, it was significantly higher than others (5.52 +/- 0.59; P < 0.0001). On the other hand, IL-4 gene expression showed no significant difference between NUD and GC patients (2.81 +/- 0.43,2.3 +/- 0.12 respectively), whereas the expression rate of this cytokine was significantly higher in PUD patients (3.7 +/- 0.1; P 0.05). Our data indicate an association between Th1 and Th2 immune responses and the development of gastric cancer and peptic ulcer disease respectively.
authors.affiliation: Biotechnology Research Center, Pasteur Institute of Iran, Tehran 13164, Iran.
authors.forename: M Eshagh
authors.initials: ME
authors.lastname: Hosseini
authors.forename: A
authors.initials: A
authors.lastname: Oghalaie
authors.forename: G
authors.initials: G
authors.lastname: Habibi
authors.forename: A
authors.initials: A
authors.lastname: Nahvijoo
authors.forename: Z M
authors.initials: ZM
authors.lastname: Hosseini
authors.forename: M
authors.initials: M
authors.lastname: Tashakoripoor
authors.forename: M
authors.initials: M
authors.lastname: Mohammadi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy; D005260:Female; D015870:Gene Expression; D016481:Helicobacter Infections / Q000276:immunology* / Q000473:pathology; D016480:Helicobacter pylori / Q000276:immunology*; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis* / Q000235:genetics; D015847:Interleukin-4 / Q000096:biosynthesis* / Q000235:genetics; D008297:Male; D008875:Middle Aged; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods*; D013270:Stomach / Q000473:pathology; D013601:T-Lymphocytes / Q000276:immunology*; D055815:Young Adult
chemical_list: D015847:Interleukin-4; D007371:Interferon-gamma