Erschienen in:
01.10.2014 | Original Research Paper
Preventive effects of Escherichia coli strain Nissle 1917 with different courses and different doses on intestinal inflammation in murine model of colitis
verfasst von:
Sumei Sha, Bin Xu, Xiangyun Kong, Ni Wei, Jian Liu, Kaichun Wu
Erschienen in:
Inflammation Research
|
Ausgabe 10/2014
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Abstract
Objective
To analyze the in vivo effect of Escherichia coli Nissle 1917 (EcN) with different courses and different doses to Sprague–Dawley rats with trinitrobenzene sulfonic acid (TNBS)-induced colitis.
Methods
The probiotic was orally administered with different courses of treatment (with or without pre-administration) and different doses (107–109 CFU/day) to Sprague–Dawley rats with TNBS-induced colitis. Therapeutic effects, levels of cytokine in serum, mRNA and protein expression were analyzed.
Results
Oral EcN administration after TNBS-induced improved colitis dose dependently. In parallel, a reduction of disease activity index and colonic MPO activity together with a decreased level of TNF-α and a trend of increased IL-10 expression was detected. Pre-administration of 107 CFU/day EcN to TNBS-treated rats resulted in a significant protection against inflammatory response and colons isolated from these rats exhibited a more pronounced expression of ZO-1 than the other groups. In the group of pre-administration of 109 CFU/day, the condition was not improved but deteriorated.
Conclusions
This study convincingly demonstrates that pre-administration of probiotic EcN with low dose is able to protect colitis of rats and mediate up-regulation of ZO-1 expression, but long-term of high-dose EcN may do harm to colitis.