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Adjuvant effect of short chain triacylglycerol tributyrin on a mouse contact hypersensitivity model.
Toxicology Letters 2018 March 2
Little attention has been paid to chemicals that can enhance hypersensitivity caused by other chemicals. We have demonstrated that phthalate esters with short chain alcohols enhance fluorescein isothiocyanate (FITC)-induced contact hypersensitivity (CHS) in a mouse model. Furthermore, phthalate esters with such an enhancing effect were found to activate transient receptor potential ankyrin 1 (TRPA1) cation channels, which are expressed on a part of sensory neurons, using a TRPA1-expressing cell line. In this study, we examined these activities of esters comprising glycerol and a short chain fatty acid, i.e. dibutyrin and tributyrin. We carried out chemical synthesis of dibutyrin isomers. Each dibutyrin isomer weakly activated TRPA1 and slightly enhanced skin sensitization to FITC. Unexpectedly, TRPA1 activation and enhancement of FITC-CHS were much more evident in the presence of tributyrin. Mechanistically, tributyrin induced increased dendritic cell trafficking from the skin to draining lymph nodes. Tributyrin enhanced interferon-γ (IFN-γ) production by draining lymph nodes, while its effect on interleukin-4 (IL-4) production was relatively less prominent. These results suggested that tributyrin concomitantly caused TRPA1 activation and an adjuvant effect on FITC-CHS.
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