FIG. 1.

Effect of infection of HT29-19A epithelial cell monolayers with H. pylori cagA(+) strains on epithelial barrier function in an Ussing chamber. (A) Parameters reflecting paracellular permeability. No significant difference between the H. pylori-treated and control cells was found, indicating that H. pylori does not alter the paracellular permeability of the epithelium. (B) Parameters reflecting the transcellular transport of HRP by transcytosis. ∗, Significantly different from control value (P < 0.04). Results are expressed (for units of measure, see Table 1) as means ± SE of control (n = 20) or H. pylori-infected (n = 20) cell monolayers.