Proton pump inhibitors induce changes in colonocyte gene expression that may affect Clostridium difficile infection

Background Proton pump inhibitors seem to promote Clostridium difficile infection (CDI). Although the current literature suggests that this association is mediated through gastric acid suppression, there has been little investigation into whether a direct effect on expression of colonocyte genes may also have a role. The aim of this study was to investigate the effect of omeprazole on genome-wide gene expression in a human colonic cell line. Methods T84 cell monolayers were treated with acid-activated omeprazole at 0, 1, 10, or 100 μmol/L for 48 hours. Cells were lysed and total RNA samples were reverse transcribed and used to generate biotinylated cRNA. Whole-genome transcript expression levels were then quantified using an Illumina HT-12 BeadChip microarray targeting 25,440 genes. Transcripts with a stringent minimum absolute fold change of 1.5 and an adjusted nominal P value