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. 2016 Jan 6;6:1481. doi: 10.3389/fmicb.2015.01481

Figure 7.

Figure 7

Toxicity of the microbial metabolome for an intestinal monolayer. Effect of dialysis liquids (before exchange in TIM-2; not containing microbial metabolites) and dialysates (after exchange in TIM-2; at 72 h) of the lowFe condition and 50FeS condition on the integrity and permeability of a Caco-2 monolayer. Epithelial integrity is displayed as relative transepithelial electrical resistance (TEER) which was regularly recorded during 7 h incubation. HBSS was used as a standard maintaining buffer which should keep the TEER at a constant high level. The decrease in epithelial integrity of the 50FeS dialysate was significantly faster compared to the lowFe dialysate as analyzed by linear regression. We note that iron was removed from the dialysis liquids and dialysates prior to applying them to the epithelial monolayers (A). Epithelial permeability as determined by the flux of phenol red from the apical side to the basolateral side, analyzed by an unpaired t-test (B). **p < 0.01 n = 3 for the dialysis liquids before exchange in TIM-2 and n = 6 for the dialysates after exchange; at 72 h in TIM-2.