Abstract

Indole-3-acetic acid (IAA) produced by intestinal bacteria from tryptophan in dietary proteins is considered to suppress the inflammatory response through aryl hydrocarbon receptor (AhR) activation. However, AhR activation was not involved in the downregulation of tumor necrosis factor α (TNFα) expression induced by IAA in Caco-2 cells. The activation of unidentified IAA receptors might attenuate the inflammatory response to TNFαin colorectal cancer cells.

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