Abstract
Background
We previously demonstrated angiotensin converting enzymes (ACE) over-expression in a dextran-sodium sulfate colitis model; ACE inhibitor (ACE-I) treatment reduced colitis severity in this model. However, ACE-I has not been tested in more immunologically relevant colitis models.
Aim
We hypothesized that ACE-I would decrease disease severity in an IL-10 knockout (−/−) colitis model.
Methods
Colitis was induced by giving 10-week old IL-10−/− mice piroxicam (P.O.) for 14 days. The ACE-I enalaprilat was given transanally at a dose of 6.25 mg/kg for 21 days. Prednisolone (PSL) with or without enalaprilat were used as therapeutic, comparative groups. All groups were compared to a placebo treated group. Outcome measures were clinical course, histology, abundance of pro-inflammatory cytokines/chemokines, and epithelial barrier function.
Results
Enalaprilat exhibited better survival (91 %) versus other treatment groups (PSL: 85.7 %, PSL + ACE-I: 71.4 %, placebo: 66.6 %). The ACE-I and PSL + ACE-I groups showed significantly better histological scores versus placebo mice. ACE-I and the PSL groups significantly reduced several pro-inflammatory cytokines versus placebo mice. FITC-dextran permeability was reduced in the ACE-I and PSL + ACE-I groups. Blood pressure was not affected in ACE-I treated mice compared to placebo mice.
Conclusions
ACE-I was effective in reducing severity of colitis in an IL-10−/− model. The addition of prednisolone minimally augmented this effect. The findings suggest that appropriately dosed ACE-I with or without steroids may be a new therapeutic agent for colitis.
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Acknowledgments
We thank Nathan Opaleski and Pele Browner for their excellent technical assistance. The authors received Grant Support NIH-R01 AI-44076-13, NIH UL1-RR024986 and NIH 1 R43 DK088495-01.
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10620_2013_2825_MOESM1_ESM.eps
Supplemental: Modified histological colitis scoring system. Images of H&E-stained histomicrographs representing scores from 0 to 5 in our modified scoring system are shown. Examples include a modification of a previously described scoring system whereby a broader scoring of mononuclear infiltration was added to the histological scores [20]. The values for the scoring system are found in Table 1. These images were taken 10× magnifications. (EPS 16032 kb)
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Sueyoshi, R., Ignatoski, K.M.W., Daignault, S. et al. Angiotensin Converting Enzyme-Inhibitor Reduces Colitis Severity in an IL-10 Knockout Model. Dig Dis Sci 58, 3165–3177 (2013). https://doi.org/10.1007/s10620-013-2825-4
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DOI: https://doi.org/10.1007/s10620-013-2825-4