Systematic review: the role of bile acids in the pathogenesis of gastro-oesophageal reflux disease and related neoplasia - PubMed (original) (raw)
Review
Systematic review: the role of bile acids in the pathogenesis of gastro-oesophageal reflux disease and related neoplasia
K R McQuaid et al. Aliment Pharmacol Ther. 2011 Jul.
Abstract
Background: Factors other than acid may play a role in gastro-oesophageal reflux disease (GERD) and its complications.
Aim: To assessed the role of bile acids in the pathogenesis of GERD, Barrett's oesophagus and Barrett's-related neoplasia.
Methods: We conducted a systematic review of computerised bibliographic databases for original articles involving humans or human oesophageal tissue or cells that assessed exposure to or manipulation of bile acids. Outcomes assessed included GERD symptoms; gross oesophageal injury; Barrett's oesophagus and related neoplasia; and intermediate markers of inflammation, proliferation or neoplasia.
Results: Eighty-three original articles were included. In in vivo studies, bile acids concentrations were higher in the oesophageal aspirates of patients with GERD than controls, and bile acids infusions triggered GERD symptoms, especially in high concentrations or in combination with acid. In ex vivo/in vitro studies, bile acids stimulated squamous oesophageal cells and Barrett's epithelial cells to produce inflammatory mediators (e.g., IL-8 and COX-2) and caused oxidative stress, DNA damage and apoptosis. They also induced squamous cells to change their gene expression pattern to resemble intestinal-type cells and caused Barrett's cells to increase expression of intestinal-type genes.
Conclusions: In aggregate, these studies suggest that bile acids may contribute to the pathogenesis of symptoms, oesophagitis and Barrett's metaplasia with related carcinogenesis in patients with GERD. However, all study results are not uniform and substantial differences in study parameters may explain at least some of this variation.
© 2011 Blackwell Publishing Ltd.
Comment in
- Upper gastrointestinal tract: Bile acids may have a role in GERD and related neoplasia.
Thompson R. Thompson R. Nat Rev Gastroenterol Hepatol. 2011 Aug 5;8(8):419. doi: 10.1038/nrgastro.2011.110. Nat Rev Gastroenterol Hepatol. 2011. PMID: 21818141 No abstract available.
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