Endogenous Indole Pyruvate Pathway for Tryptophan Metabolism Mediated by IL4I1.

Xia Zhang, Min Gan, Jingyun Li, Hui Li, Meicheng Su, Dongfei Tan, Shaolei Wang, Man Jia, Liguo Zhang, Gang Chen

Journal of agricultural and food chemistry 2020 Sep 30

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l-tryptophan (Trp) is widely used in food and feed enforcement to play an important role in biological processes. Various metabolites of Trp perform its potent function. The indole pyruvate pathway is one of the main pathways of Trp metabolism in the gut microbiota, providing numerous indole-derivatives, which can modulate intestinal homeostasis and mucosal immunity by activating the aryl hydrocarbon receptor (AHR) signaling pathway. In this study, we constructed an IL4I1-overexpressed 293T cell line and found that IL4I1 can catalyze Trp to produce indole-3-acetic acid (IAA) and indole-3-carboxaldehyde (IAld). Moreover, both IAA and IAld are accumulated in dendritic cells (DCs) and can stimulate the expression of CYP1A1. Our results demonstrate the existence of the indole pyruvate pathway in host cells with IL4I1 as the key enzyme. The IL4I1-mediated Trp metabolism implies the role of dietary impact on immunity.

Citation

Xia Zhang, Min Gan, Jingyun Li, Hui Li, Meicheng Su, Dongfei Tan, Shaolei Wang, Man Jia, Liguo Zhang, Gang Chen. Endogenous Indole Pyruvate Pathway for Tryptophan Metabolism Mediated by IL4I1. Journal of agricultural and food chemistry. 2020 Sep 30;68(39):10678-10684