Activation of the Ah Receptor Modulates Gastrointestinal Homeostasis and the Intestinal Microbiome

Purpose of Review The Aryl hydrocarbon receptor (AHR) is a ligand-activated transcription factor that responds to a variety of structurally diverse exogenous and endogenous small molecules. The AHR has been implicated in both host and microbiota homeostasis. Understanding the role of the AHR in gastrointestinal health and the appropriate level of AHR activation has implications in determining whether the AHR is an appropriate target for dietary or drug intervention.