Abstract
Inflammatory bowel disease (IBD) is very common in Europe and USA. Its incidence in East Asia has been traditionally low, albeit the risk of IBD increases in Asian immigrants adopting western lifestyles, suggesting a strong role of environmental/dietary factors in IBD. A lifelong exposure to phytoestrogen-rich diets has been associated with a decreased risk of developing breast cancer and might also be protective against IBD. We studied the influence of in utero and postnatal exposure to a phytoestrogen (PE)-rich diet on acute inflammation in an animal model of TNBS-induced colitis. Wistar rats were exposed in utero and postnatally to high (genistein: 240 μg/g feed; daidzein: 232 μg/g feed) or very low levels (genistein and daidzein <10 μg/g feed) of phytoestrogen isoflavones fed to pregnant dams with the diet and throughout nursing. After weaning, the offspring had free access to these diets. At the age of 11 weeks, colitis was induced with an enema of TNBS. After 3 days, animals were sacrificed and tissues were collected for histological evaluation and analysis of molecular markers of inflammation. Animals kept on a PE-rich diet (PRD) had higher colon weights than animals on low PE-levels (PDD), suggesting enhanced acute inflammation by phytoestrogens. This result was supported by histological findings and by analysis of myeloperoxidase activity. Interestingly, relative mRNA and protein expression of cyclooxygenase-2 (COX-2) were modulated in rats on PRD, providing evidence that COX-2, the inducible isoform of the enzyme, is involved in the management of colonic inflammation. Our results suggest that early-in-life exposure to PE might not protect against the development of IBD but enhances the extent of acute inflammation.
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Abbreviations
- b.w.:
-
Body weight
- COX-2:
-
Cyclooxygenase-2
- CT:
-
Threshold cycle
- ER:
-
Estrogen receptor
- ERβ:
-
Estrogen receptor beta
- HETAB:
-
Hexadecyltrimethylammonium bromide
- IBD:
-
Inflammatory bowel disease
- IU:
-
International units
- MPO:
-
Myeloperoxidase
- OD:
-
Outer diameter
- PDD:
-
Phytoestrogen-depleted diet
- PE:
-
Phytoestrogen
- PRD:
-
Phytoestrogen-rich diet
- TMB:
-
Tetramethyl benzidine
- TNBS:
-
2,4,6-Trinitrobenzenesulfonic acid
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Acknowledgments
This work was supported by DFG grant DI 716/10-3. The authors wish to thank Dr. Eric Houdeau of the Institut National de la Recherche Agronomique, Toulouse, France, for providing valuable background information, Dr. Natali Bauer of the University of Giessen, Germany, for the performance of blood counts, and Cathrin Häusser (DSHS) for technical assistance during this study.
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Seibel, J., Molzberger, A.F., Hertrampf, T. et al. In utero and postnatal exposure to a phytoestrogen-enriched diet increases parameters of acute inflammation in a rat model of TNBS-induced colitis. Arch Toxicol 82, 941–950 (2008). https://doi.org/10.1007/s00204-008-0309-7
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DOI: https://doi.org/10.1007/s00204-008-0309-7