[No authors listed]
PURPOSE:To investigate the effects of Helicobacter pylori (H. pylori)-CagA and the urease metabolite NHâ⺠on mucin expression in AGS cells. MATERIALS AND METHODS:AGS cells were transfected with CagA and/or treated with different concentrations of NHâCL. Mucin gene and protein expression was assessed by qPCR and immunofluorescence assays, respectively. RESULTS:CagA significantly upregulated MUC5AC, MUC2, and MUC5B expression in AGS cells, but did not affect E-cadherin and MUC6 expression. MUC5AC, MUC6, and MUC2 expression in AGS cells increased with increasing NHâ⺠concentrations until reaching a peak level at 15 mM. MUC5B mRNA expression in AGS cells (NHâ⺠concentration of 15 mM) was significantly higher than that at 0, 5, and 10 mM NHââº. No changes in E-cadherin expression in AGS cells treated with NHâ⺠were noted, except at 20 mM. The expression of MUC5AC, MUC2, and MUC6 mRNA in CagA-transfected AGS cells at an NHâ⺠concentration of 15 mM was significantly higher than that at 0 mM, and decreased at higher concentrations. The expression of MUC5B mRNA increased with increases in NHâ⺠concentration, and was significantly higher compared to that in untreated cells. No significant change in the expression of E-cadherin mRNA in CagA-transfected AGS cells was observed. Immunofluorescence assays confirmed the observed changes. CONCLUSION:H. pylori may affect the expression of MUC5AC, MUC2, MUC5B, and MUC6 in AGS cells via CagA and/or NHââº, but not E-cadherin.
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