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Preventive oral supplementation with Bifidobacterium longum 51A alleviates oxazolone-induced allergic contact dermatitis-like skin inflammation in mice

于Beneficial Microbes
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W.R. Ribeiro Department of Pharmaceutical Sciences, Institute of Environmental, Chemistry and Pharmaceutical Sciences, Federal University of São Paulo, R. São Nicolau, 210, Diadema, SP 09913-030, Brazil.

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A.G. Queiroz Department of Pharmaceutical Sciences, Institute of Environmental, Chemistry and Pharmaceutical Sciences, Federal University of São Paulo, R. São Nicolau, 210, Diadema, SP 09913-030, Brazil.

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E. Mendes Department of Pharmaceutical Sciences, Institute of Environmental, Chemistry and Pharmaceutical Sciences, Federal University of São Paulo, R. São Nicolau, 210, Diadema, SP 09913-030, Brazil.

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M.B. Casaro Department of Pharmaceutical Sciences, Institute of Environmental, Chemistry and Pharmaceutical Sciences, Federal University of São Paulo, R. São Nicolau, 210, Diadema, SP 09913-030, Brazil.

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C.M. Nascimento Department of Pharmaceutical Sciences, Institute of Environmental, Chemistry and Pharmaceutical Sciences, Federal University of São Paulo, R. São Nicolau, 210, Diadema, SP 09913-030, Brazil.

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L.S.S.F. Coelho Department of Pharmaceutical Sciences, Institute of Environmental, Chemistry and Pharmaceutical Sciences, Federal University of São Paulo, R. São Nicolau, 210, Diadema, SP 09913-030, Brazil.

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F.S. Martins Department of Microbiology, Institute of Biological Sciences, Federal University of Minas Gerais, Avenida Presidente Antônio Carlos 6627, Campus Pampulha UFMG Belo Horizonte, MG 31970201, Brazil.

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V.R. Leite-Silva Department of Pharmaceutical Sciences, Institute of Environmental, Chemistry and Pharmaceutical Sciences, Federal University of São Paulo, R. São Nicolau, 210, Diadema, SP 09913-030, Brazil.
Therapeutics Research Centre, Translational Research Institute, Diamantina Institute, University of Queensland, 37 Kent St, Woolloongabba, QLD 4102, Australia.

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C.M. Ferreira Department of Pharmaceutical Sciences, Institute of Environmental, Chemistry and Pharmaceutical Sciences, Federal University of São Paulo, R. São Nicolau, 210, Diadema, SP 09913-030, Brazil.

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Allergic contact dermatitis (ACD) is a common allergic skin disease that affects individuals subjected to different antigen exposure conditions and significantly impacts the quality of life of those affected. Numerous studies have demonstrated that probiotics suppress inflammation through immunomodulatory effects. In this study, we aimed to evaluate the effect of the probiotic Bifidobacterium longum 51A as a preventive treatment for ACD using an oxazolone-induced murine model. We demonstrated that B. longum 51A exerted a prophylactic effect on oxazolone-induced ACD-like skin inflammation via reductions in ear and dermal thickness and leucocyte infiltration. The administration of inactivated B. longum 51A did not affect oxazolone-induced ACD-like skin inflammation, suggesting that the bacteria must be alive to be effective. Given that B. longum 51A is an acetate producer, we treated mice with acetate intraperitoneally, which also prevented ear and dermal thickening. Moreover, the tissue levels of the inflammatory cytokines and chemokines interleukin (IL)-10, IL-33, tumour necrosis factor-α, chemokine (C-C motif) ligand 2/monocyte chemoattractant protein-1 and chemokine (C-C motif) ligand 5/RANTES were significantly reduced after probiotic treatment, but only IL-33 and IL-10 were reduced when the mice were treated with acetate. These results show that B. longum 51A exerted a potential prophylactic effect on skin inflammation and that acetate represents one potential mechanism. However, other factors are likely involved since these two treatments do not yield the same results.

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