AIM: Little has been known about the pathogenesis of non-erosive reflux disease (NERD). Recent studies have implicated interleukin 8 (IL-8) in the development and progression of gastroesophogeal reflux disease (GERD). The purpose of this study was to determine IL-8 RNA expression levels in NERD patients with or without subtle mucosal changes. METHODS: We studied 26 patients with NERD and 13 asymptomatic controls. Biopsy sample was taken from the esophagus 3 cm above the gastroesophageal junction and snap frozen for measurement of IL-8 mRNA levels by real-time quantitative polymerase chain reaction (PCR). We also examined mRNA expression of IL-8 receptors, CXCR-1 and -2 by reverse transcriptase PCR. The patients were endoscopically classified into grade M (mucosal color changes without visible mucosal break) and N (neither minimal involvement nor mucosal break) of the modified Los Angeles classification. RESULTS: The relative IL-8 mRNA expression levels were significantly higher in esophageal mucosa of NERD patients than those in esophageal mucosa of the controls. There was a significant difference in IL-8 mRNA levels between grades M and N. The CXCR-1 and -2 mRNAs were constitutively expressed in esophageal mucosa. CONCLUSION: Our results suggest that high IL-8 levels in esophageal mucosa may be involved in the pathogenesis of NERD through interaction with its receptors. NERD seems to be composed of a heterogeneous population in terms of not only endoscopically minimal involvement but also immune and inflammatory processes.
AIM: Little has been known about the pathogenesis of non-erosive reflux disease (NERD). Recent studies have implicated interleukin 8 (IL-8) in the development and progression of gastroesophogeal reflux disease (GERD). The purpose of this study was to determine IL-8 RNA expression levels in NERD patients with or without subtle mucosal changes. METHODS: We studied 26 patients with NERD and 13 asymptomatic controls. Biopsy sample was taken from the esophagus 3 cm above the gastroesophageal junction and snap frozen for measurement of IL-8 mRNA levels by real-time quantitative polymerase chain reaction (PCR). We also examined mRNA expression of IL-8 receptors, CXCR-1 and -2 by reverse transcriptase PCR. The patients were endoscopically classified into grade M (mucosal color changes without visible mucosal break) and N (neither minimal involvement nor mucosal break) of the modified Los Angeles classification. RESULTS: The relative IL-8 mRNA expression levels were significantly higher in esophageal mucosa of NERDpatients than those in esophageal mucosa of the controls. There was a significant difference in IL-8 mRNA levels between grades M and N. The CXCR-1 and -2 mRNAs were constitutively expressed in esophageal mucosa. CONCLUSION: Our results suggest that high IL-8 levels in esophageal mucosa may be involved in the pathogenesis of NERD through interaction with its receptors. NERD seems to be composed of a heterogeneous population in terms of not only endoscopically minimal involvement but also immune and inflammatory processes.
Authors: Tatiana I Rogounovitch; Vladimir A Saenko; Yuki Shimizu-Yoshida; Aleksandr Yu Abrosimov; Eugeny F Lushnikov; Pavel O Roumiantsev; Akira Ohtsuru; Hiroyuki Namba; Anatoly F Tsyb; Shunichi Yamashita Journal: Cancer Res Date: 2002-12-01 Impact factor: 12.701
Authors: D Armstrong; J R Bennett; A L Blum; J Dent; F T De Dombal; J P Galmiche; L Lundell; M Margulies; J E Richter; S J Spechler; G N Tytgat; L Wallin Journal: Gastroenterology Date: 1996-07 Impact factor: 22.682
Authors: B Metzner; C Hofmann; C Heinemann; U Zimpfer; I Schraufstätter; E Schöpf; J Norgauer Journal: Oncol Rep Date: 1999 Nov-Dec Impact factor: 3.906
Authors: H Isomoto; H Furusu; T Morikawa; Y Mizuta; T Nishiyama; K Omagari; K Murase; K Inoue; I Murata; S Kohno Journal: Aliment Pharmacol Ther Date: 2000-12 Impact factor: 8.171
Authors: R Carlsson; J Dent; E Bolling-Sternevald; F Johnsson; O Junghard; K Lauritsen; S Riley; L Lundell Journal: Scand J Gastroenterol Date: 1998-10 Impact factor: 2.423