Abstract
Susceptibility to inflammatory bowel diseases depends upon interactions between the genetics of the individual and induction of chronic mucosal inflammation. We hypothesized that administration of dietary phenolics, caffeic acid and rutin, would suppress upregulation of inflammatory markers and intestinal damage in a mouse model of colitis. Colitis was induced in C3H/ HeOuJ mice (8 weeks old, 6 male/6 female per treatment) with 1.25% dextran sulfate sodium (DSS) for 6 d in their drinking water. Rutin (1.0 mmol (524 mg)/kg in diet), caffeic acid (1.0 mmol (179 mg)/kg in diet), and hypoxoside extract (15 mg/d, an anticolitic phenolic control) were fed to the mice for 7 d before and during DSS treatment, as well as without DSS treatment. Body weight loss was prevented by rutin and caffeic acid during DSS treatment. Colon lengths in mice fed caffeic acid and hypoxoside during DSS treatment were similar to DSS-negative control. Food intake was improved and myeloperoxidase (MPO) was decreased with each phenolic treatment in DSS-treated mice compared with DSS treatment alone. Colonic mRNA expression of IL-17 and iNOS were inhibited when IL-4 was increased by each phenolic treatment combined with DSS, whereas CYP4B1 mRNA was increased only by caffeic acid in DSS-treated mice, compared with DSS treatment alone. Colonic and cecal histopathology scores of DSS-treated mice were significantly more severe (P < 0.01) than in mice fed caffeic acid before and during DSS treatment, based on mucosal height, necrosis, edema, erosion, and inflammatory cell infiltration. Although both rutin and caffeic acid suppressed the expression of selected inflammatory markers, only caffeic acid protected against DSS-induced colitis, in association with normalization of CYP4B1 expression. The inhibition of DSS-induced colitic pathology by caffeic acid was mediated by mechanisms in addition to anti-inflammatory effects that deserve further study.
Original language | English |
---|---|
Pages (from-to) | 606-616 |
Number of pages | 11 |
Journal | Experimental Biology and Medicine |
Volume | 234 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2009 Jun |
Bibliographical note
Funding Information:This research was made possible by Grant P01 ES012020 from the National Institute of Environmental Health Sciences (NIEHS) and the Office of Dietary Supplements (ODS), NIH, and by grant 95P50AT004155 from the National Center of Complementary and Alternative Medicine (NCCAM) and ODS, NIH. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the ODS, NIEHS, NCCAM, or NIH.
Keywords
- CYP4B1
- Caffeic acid
- Colitis
- Inflammation
- Mouse
- Rutin
ASJC Scopus subject areas
- General Biochemistry,Genetics and Molecular Biology