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Milk casein-based diet containing TGF-beta controls the inflammatory reaction in the HLA-B27 transgenic rat model
Eduardo J Schiffrin1, Mimoun El Yousfi, Magali Faure
1Nestlé Research Center, Nestec Ltd., Lausanne, Switzerland. eduardo.schiffrin@rdls.nestle.com
Insights
A diet with transforming growth factor-beta (TGF-beta) reduced intestinal inflammation in a rat model. This suggests dietary TGF-beta may help restore immune balance in inflammatory conditions.
Area of Science:
- Gastroenterology
- Immunology
- Nutritional Science
Background:
- Crohn's disease treatment in adolescents has utilized casein-based formulas with TGF-beta.
- The precise role of TGF-beta in managing intestinal inflammation requires further investigation.
- This study evaluates a TGF-beta-enriched diet's efficacy in controlling intestinal inflammation.
Purpose of the Study:
- To assess the therapeutic potential of a TGF-beta-containing diet in an animal model of intestinal inflammation.
- To compare the effects of a TGF-beta diet versus a control diet in HLA-B27 transgenic rats.
- To investigate TGF-beta's role in modulating immune responses and gut barrier function.
Main Methods:
- Three groups of rats (HLA-B27 transgenic and Fischer controls) were fed diets with or without TGF-beta.
- Parameters analyzed included body weight, food intake, tissue weights, fecal characteristics, and leukocyte counts.
- Intestinal inflammation was assessed via histology, myeloperoxidase activity, cytokine mRNA expression, and MUC2 protein levels.
Main Results:
- The TGF-beta diet significantly reduced colonic inflammation scores and mucosal thickness in HLA rats.
- IFN-gamma mRNA expression decreased, while MUC2 protein expression increased with the TGF-beta diet.
- The diet also mitigated leukocytosis, acute phase response, and muscle protein breakdown.
Conclusions:
- A diet supplemented with TGF-beta demonstrates beneficial effects in a rat model of intestinal inflammation.
- Dietary TGF-beta shows promise for restoring immune homeostasis in inflammatory bowel conditions.
- These findings support further research into dietary interventions for immune-related gut disorders.
Background:
A casein-based formula containing TGF-beta has been successfully used in adolescents during acute episodes of Crohn's disease. The role played by this molecule requires confirmation. We have examined the capacity of a TGF-beta containing diet to control the intestinal inflammation in HLA-B27 transgenic rats, and compared its effects with a similar diet devoid of TGF-beta.
Methods:
Three groups of rats were studied. HLA-B27/hbeta2M transgenic rats were fed with a casein-based rat-adapted diet containing TGF-beta or a control casein-based diet without TGF-beta. Fischer control animals were fed the latter. Body weight, dietary intake, tissue weights, fecal samples, leukocyte counts, and acute phase response were analyzed. Intestinal inflammation was assessed by histology, myeloperoxidase, and mRNA expression of cytokines. MUC2 protein expression was assessed by immunohistochemistry. Breakdown of muscle protein was examined.
Results:
The test diet improved diarrhea increasing the fecal dry matter and the colonic inflammation as shown by a lower inflammatory score (2.43 +/- 1.13 vs 4.42 +/- 0.53, p < .05), lower mucosal thickness (431.25 +/- 72.29 vs 508.57 +/- 81.32 microm, p = .08) and decreased IFNgamma mRNA expression. MUC2 protein expression was increased in HLA rats fed the TGF-beta diet compared with HLA rats fed the control diet, but restitution to normal pattern was not observed. The test diet also decreased leukocytosis and the acute phase response and improved the muscle catabolic response.
Conclusion:
The TGF-beta containing diet has a beneficial effect in an animal model of intestinal inflammation. Our observations support a potential role for dietary TGF-beta in the restoration of immune homeostasis.
