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Tryptamine serves as a proligand of the AhR transcriptional pathway whose activation is dependent of monoamine oxidases.


ABSTRACT: The function of the aryl hydrocarbon receptor (AhR) in mediating the biological effect to environmental pollutants is well established. However, accumulated evidence indicates a wide range of physiological and pathological functions mediated by the AhR, suggesting the existence of endogenous AhR ligand(s). The nature of an AhR ligand remain elusive; however, it is known that the AhR is activated by several compounds, such as 2,3,7,8-tetrachlorodibenzo-p-dioxin or the tryptophan photoproduct 6-formylindolo[3,2-b]carbazole. In this study, we show that physiological concentrations of tryptamine (TA) lead to induction of cytochrome P4501A1 transcription through an AhR-dependent mechanism. In addition, we show that activation of the AhR by TA requires a functional monoamino oxidase system, suggesting that TA acts as an AhR proligand possibly by converting to a high-affinity AhR ligand. Taken together, we show a possible mechanism, through which AhR signaling is activated by endogenous conversion of TA involving monoamine oxidases.

SUBMITTER: Vikstrom Bergander L 

PROVIDER: S-EPMC5416975 | biostudies-literature |

REPOSITORIES: biostudies-literature

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