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Table 1 TER across HT29-MTX monolayers depends on temporal and environmental factors including SCFAs in reactor effluents

From: Protective effect of probiotics on Salmonella infectivity assessed with combined in vitro gut fermentation-cellular models

   Experimental period
   Stab Sal Ecol I Ecol II Bif Inulin
R1       
TER 1-3 h 247 ± 24a 144 ± 24bc 143 ± 22bc 114 ± 14c 167 ± 34b 121 ± 13bc
  24 h 127 ± 23a 69 ± 20b 55 ± 11b 36 ± 4b 130 ± 47a 65 ± 14b
SCFAs* (A:P: B )   138 ± 6a
(54:11: 34 )
179 ± 6a
(44:7: 50 )
R2       
TER 1-3 h 266 ± 19a 135 ± 29b 144 ± 17b 96 ± 4c 158 ± 8b 142 ± 29b
  24 h 205 ± 34a 74 ± 17c 52 ± 4cd 34 ± 8d 115 ± 19b 87 ± 11bc
SCFAs* (A:P: B )   172 ± 6b
(54:14: 32 )
245 ± 6b
(45:12: 43 )
R3       
TER 1-3 h 240 ± 24a 124 ± 30bc 141 ± 16b 91 ± 6c 145 ± 8b 121 ± 30bc
  24 h 190 ± 37a 75 ± 17cd 77 ± 13c 32 ± 11d 119 ± 30b 91 ± 25bc
SCFAs* (A:P: B )   180 ± 13b
(55:14: 31 )
234 ± 11b
(46:11: 4 3)
  1. Mean transepithelial electrical resistance (TER; expressed in Ω cm2) ± SD were measured after incubation of HT29-MTX cell monolayers for 1-3 h (N = 18) and 24 h (N = 6) with effluents retained from (R1) proximal, (R2) transverse and (R3) distal colon reactors of F1 and F2 during the last three days of each experimental period. Values with different letters in a row of the same reactor are significantly different according to the Tukey-Kramer-HSD test (P < 0.05). *No treatment effects (except for inulin addition) were detected on total short chain fatty acid (SCFA) concentrations (expressed in mM). Mean SCFA concentrations ± SD and (A) acetate: (P) propionate: ( B ) butyrate ratios measured during the last three days of non-inulin (N = 33) and inulin (N = 3) periods are therefore presented. Values with different letters in the same column of different reactors are significantly different with the Tukey-Kramer-HSD test (P < 0.05). (Stab) initial system stabilization periods, (Sal) Salmonella infection periods, (Ecol) E. coli L1000 treatments, (Bif) B. thermophilum RBL67 treatments, (Inulin) prebiotic inulin treatment.