Journal
EXPERIMENTAL DERMATOLOGY
Volume 26, Issue 3, Pages 249-254Publisher
WILEY
DOI: 10.1111/exd.13205
Keywords
chemokine (C-X-C motif) ligand 2; contact hypersensitivity; gut microbiota; soyasaponin; triggering receptor expressed on myeloid cells-1
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Funding
- Japan Society for the Promotion of Science KAKENHI [25350112]
- Fuji Foundation for Protein Research
- Kawasaki University of Medical Welfare
- Grants-in-Aid for Scientific Research [16K00835] Funding Source: KAKEN
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Soyasaponins (SSs) abundant in soybean have anti-inflammatory activities; however, their therapeutic effects on allergic contact dermatitis (ACD) remain unknown. To assess the effects of SS-enriched diets on ACD, we used a mouse model of contact hypersensitivity (CHS). Mice were fed low-dose or high-dose SS-containing diets for 3 weeks prior to CHS induction with 2,4-dinitrofluorobenzene (DNFB). The low-dose SS diet attenuated DNFB-induced ear swelling and tissue oedema, and reduced the number of infiltrating Gr-1-positive myeloid cells. Low-dose, but not high-dose, SSs decreased chemokine (C-X-C motif) ligand 2 (CXCL2) and triggering receptor expressed on myeloid cells (TREM)-1 production in ear tissues, compared to a control. Taxonomic 16S rRNA analysis revealed significant alterations in faecal microbiota caused by CHS, which were reversed by low-dose SSs. The low-dose SS and non-CHS groups clustered together, while the high-dose SS group split between CHS and non-CHS clusters. Our results demonstrated that low-dose SSs alleviated CHS symptoms by attenuating inflammation and improving the intestinal microbiota composition, suggesting that dietary SSs may have beneficial effects on ACD.
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