Tryptophan depletion sensitizes the AHR pathway by increasing AHR expression and GCN2/LAT1-mediated kynurenine uptake, and potentiates induction of regulatory T lymphocytes.
Marie SolvayPauline PfänderSimon KlaessensLuc PilotteVincent StroobantJuliette LamyStefan NaulaertsQuentin SpillierRaphaël FrederickEtienne De PlaenChristine SersChristiane A OpitzBenoit J Van den EyndeJingjing ZhuPublished in: Journal for immunotherapy of cancer (2023)
overexpression and increasing cellular kynurenine uptake. As a result, tryptophan catabolites such as kynurenine more potently activate AHR, and Treg differentiation is promoted. Our results propose a molecular explanation for the combined roles of tryptophan deprivation and kynurenine production in mediating IDO1/TDO-induced immune suppression.