Disrupted intestinal microbiota and intestinal inflammation in children with cystic fibrosis and its restoration with Lactobacillus GG: a randomised clinical trial. PLoS One. 2014;9:e87796. [PMID: 24586292 DOI: 10.1371/journal.pone.0087796.eCollection2014]

Effect of bifidobacterial adhesin on intestinal microflora and bacterial translocation induced by ischemia-reperfusion injury in rats

AIM: To observe the effect of bifidobacterial adhesin on intestinal microflora and bacterial translocation induced by ischemia-reperfusion (I/R) injury in rats.

METHODS: Seventy-two SD rats were randomly divided into a sham operation group (n = 24), an I/R model group (n = 24) and an experiment group (n = 24; treated with bifidobacterial adhesin). The rats were sacrificed 6 h, 1, 4 and 7 d after inducing I/R. The changes of intestinal microflora and bacterial translocation were observed, and the blood level of endotoxin was measured.

RESULTS: In the I/R model group, the numbers of Enterrococci (6.63 lgN/g ± 1.06 lgN/g vs 5.26 lgN/g ± 1.08 lgN/g, 9.44 lgN/g ± 1.37 lgN/g vs 5.30 lgN/g ± 1.12 lgN/g, 8.56 lgN/g ± 1.35 lgN/g vs 4.99 lgN/g ± 0.96 lgN/g, 8.23 lgN/g ± 1.01 lgN/g vs 5.18 lgN/g ± 1.03 lgN/g, P < 0.05) and Enterobacilli (7.86 lgN/g ± 1.17 lgN/g vs 6.39 lgN/g ± 0.85 lgN/g, 9.49 lgN/g ± 1.23 lgN/g vs 6.64 lgN/g ± 1.44 lgN/g, 8.76 lgN/g ± 0.86 lgN/g vs 6.52 lgN/g ± 1.13 lgN/g, 8.89 lgN/g ± 1.09 lgN/g vs 6.71 lgN/g ± 0.98 lgN/g, P < 0.05) in the feces of rats increased significantly at all time points, the numbers of Clostridium perfringens increased significantly on days 1 (6.47 lgN/g ± 1.43 lgN/g vs 4.51 lgN/g ± 1.22 lgN/g, P < 0.05), 4 (6.70 lgN/g ± 1.16 lgN/g vs 4.71 lgN/g ± 0.89 lgN/g, P < 0.05) and 7 (6.55 lgN/g ± 1.29 lgN/g vs 4.46 lgN/g ± 0.79 lgN/g, P < 0.05), while the numbers of Bifidobacterium (6.13 lgN/g ± 1.28 lgN/g vs 9.02 lgN/g ± 1.10 lgN/g, 5.59 lgN/g ± 1.22 lgN/g vs 8.66 lgN/g ± 0.99 lgN/g, P < 0.05) and Lactobacillus (6.07 lgN/g ± 1.09 lgN/g vs 9.08 lgN/g ± 1.04 lgN/g, 5.35 lgN/g ± 1.26 lgN/g vs 8.89 lgN/g ± 0.97 lgN/g, P < 0.05) decreased significantly on days 4 and 7 compared with those in the control subjects. The numbers of Enterrococci (6.37 lgN/g ± 1.04 lgN/g vs 8.56 lgN/g ± 1.35 lgN/g, 5.42 lgN/g ± 0.92 lgN/g vs 8.23 lgN/g ± 1.01 lgN/g, P < 0.05) and Enterobaci (7.55 lgN/g ± 1.03 lgN/g vs 8.76 lgN/g ± 0.86 lgN/g, 7.16 lgN/g ± 0.86 lgN/g vs 8.89 lgN/g ± 1.09 lgN/g, P < 0.05) in the experiment group were significantly lower than those in the I/R model group on days 4 and 7. The numbers of Clostridium perfringens on days 1, 4 and 7 (5.95 lgN/g ± 1.24 lgN/g vs 4.51 lgN/g ± 1.22 lgN/g, 6.08 lgN/g ± 1.07 lgN/g vs 4.71 lgN/g ± 0.89 lgN/g, 5.87 lgN/g ± 0.82 lgN/g vs 4.46 lgN/g ± 0.79 lgN/g, P< 0.05) were significantly higher in the experiment group than in the control group, but had declined compared to those in the I/R group. The numbers of Bifidobacterium (8.56 lgN/g ± 0.85 lgN/g vs 8.45 lgN/g ± 0.86 lgN/g, 7.89 lgN/g ± 1.47 lgN/g vs 8.78 lgN/g ± 1.06 lgN/g, 8.67 lgN/g ± 1.13 lgN/g vs 9.02 lgN/g ± 1.10 lgN/g, 8.75 lgN/g ± 0.96 lgN/g vs 8.66 lgN/g ± 0.99 lgN/g, P > 0.05) and Lactobacillus (9.16 lgN/g ± 0.94 lgN/g vs 8.91 lgN/g ± 1.06 lgN/g, 8.56 lgN/g ± 1.21 lgN/g vs 9.11 lgN/g ± 1.13 lgN/g, 9.16 lgN/g ± 1.08 lgN/g vs 9.08 lgN/g ± 1.04 lgN/g, 9.01 lgN/g ± 0.95 lgN/g vs 8.89 lgN/g ± 0.97 lgN/g, P > 0.05) showed no significant changes at all time points in the experiment group. The values of endotoxin (1.43 EU/mL ± 0.32 EU/mL vs 0.21 EU/mL ± 0.18 EU/mL,1.84 EU/mL ± 0.24 EU/mL vs 0.30 EU/mL ± 0.23 EU/mL,1.69 EU/mL ± 0.35 EU/mL vs 0.26 EU/mL ± 0.21 EU/mL,1.73 EU/mL ± 0.31 EU/mL vs 0.28 EU/mL ± 0.19 EU/mL, P < 0.05) and bacterial translocation rates in the liver (50% vs 0, 66.67% vs 16.67%, 83.33% vs 0, 83.33% vs 0, P < 0.05), spleen (33.33% vs 0, 50% vs 0, 66.67% vs 0, 66.67% vs 0, P < 0.05) and mesenteric lymph nodes (66.67% vs 0, 83.33% vs 0, 100% vs 16.67%, 100% vs 0, P < 0.05) in the I/R model group were significantly higher than those in the control group, while these parameters were significantly lower in the experiment group than in the I/R model group at all time points (endotoxin: 0.57 EU/mL ± 0.23 EU/mL vs 1.43 EU/mL ± 0.32 EU/mL, 0.71 EU/mL ± 0.16 EU/mL vs 1.84 EU/mL ± 0.24 EU/mL, 0.41 EU/mL ± 0.22 EU/mL vs 1.69 EU/mL ± 0.35 EU/mL, 0.35 EU/mL ± 0.12 EU/mL vs 1.73 EU/mL ± 0.31 EU/mL, P < 0.05; bacterial translocation in the liver: 16.67% vs 50%, 33.33% vs 66.67%, 50% vs 83.33%, 33.33% vs 83.33%, P < 0.05; spleen: 0 vs 33.33%, 16.67% vs 50%, 33.33% vs 66.67%, 33.33% vs 66.67%, P < 0.05; mesenteric lymph nodes: 50% vs 66.67%, 50% vs 83.33%, 50% vs 100%, 33.33% vs 100%, P < 0.05).

CONCLUSION: Bifidobacterial adhesin can improve the intestinal flora imbalance, reduce bacterial translocation and endotoxemia occurrence, and protect intestinal mucosal barrier function in rats after intestinal I/R injury.