title: Proton pump inhibitor co-therapy normalizes the increased cell turnover of the gastric mucosa both in NSAID and selective COX-2 users.
abstract: Proton pump inhibitor (PPI) co-therapy is considered the best strategy in preventing gastrointestinal complications during non-steroidal anti-inflammatory drug (NSAID) treatment, but there is limited information available on its effect on gastric mucosal cell kinetics. To evaluate the effect of PPI co-therapy on gastric mucosa we investigated epithelial cell proliferation, apoptosis, epithelial growth factor receptor (EGFR) and p53 expression in patients on chronic non-selective NSAID or cyclooxygenase-2 selective inhibitor (COX-2) treatment. Gastric biopsies of the antrum were taken from 10-10 patients on chronic NSAID and COX-2, therapy prior and after 6 months PPI co-therapy, and 10 controls without any treatment. Cell proliferation, apoptosis, EGFR and p53 expression were measured by immunohistochemistry. At least 600 glandular epithel cells were encountered and results were expressed as % of total cells counted. We found increased cell proliferation in patients on chronic COX-2 but not on NSAID therapy. Patients on either NSAID or COX-2 therapy had an increased p53 and decreased EGFR expression. PPI therapy reversed not only the increased cell proliferation and p53 expression, but also the suppressed EGFR expression when administered as co-therapy. The fewer gastrointestinal side effects observed during chronic COX-2 therapy may partially be the result of the higher cell proliferation. This effect is not mediated by the EGFR pathway. PPI co-therapy normalizes the disturbed cell kinetics irrespective of NSAID treatment used.
authors.affiliation: 2nd Department of Medicine, Semmelweis University, Hungarian Academy of Science, Clinical Gastroenterology Research Unit, Budapest, Hungary. hritz.istvan@freemail.hu
authors.forename: I
authors.initials: I
authors.lastname: Hritz
authors.forename: L
authors.initials: L
authors.lastname: Herszenyi
authors.forename: B
authors.initials: B
authors.lastname: Molnár
authors.forename: Z
authors.initials: Z
authors.lastname: Tulassay
authors.forename: L
authors.initials: L
authors.lastname: Prónai
mesh_terms: D000328:Adult; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000009:adverse effects*; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology; D002452:Cell Count; D049109:Cell Proliferation / Q000187:drug effects; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000009:adverse effects*; D004249:DNA Damage / Q000187:drug effects; D004311:Double-Blind Method; D004791:Enzyme Inhibitors / Q000627:therapeutic use*; D005260:Female; D005753:Gastric Mucosa / Q000473:pathology*; D018773:Genes, erbB-1 / Q000235:genetics; D016158:Genes, p53 / Q000235:genetics; D006801:Humans; D007150:Immunohistochemistry; D020287:In Situ Nick-End Labeling; D008297:Male; D008565:Membrane Proteins; D008875:Middle Aged; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism*; D054328:Proton Pump Inhibitors; D013276:Stomach Ulcer / Q000139:chemically induced* / Q000473:pathology*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D004791:Enzyme Inhibitors; D008565:Membrane Proteins; D018809:Proliferating Cell Nuclear Antigen; D054328:Proton Pump Inhibitors; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases