Figure 4

HT29-MTX monolayer integrity in complex colonic environments is affected by Salmonella infection and probiotic treatments. Tight junctions (in red) and nuclei (in blue) of HT29-MTX cells were stained with phalloidin and DAPI, respectively, after incubation for 90 min with distal reactor effluents of F1 retained at the end of (A, Stab) initial model stabilization, (B, Sal) Salmonella infection, (C, Ecol II) E. coli L1000 and (D, Bif I) B. thermophilum RBL67 periods. Tight junctions were highly disrupted after incubation with effluents from Salmonella infection (Sal) compared to initial model stabilization periods (Stab).