Both IDO1 and TDO contribute to the malignancy of gliomas via the Kyn-AhR-AQP4 signaling pathway

Signal Transduction and Targeted Therapy
Lisha DuQing Yang

Abstract

Indoleamine 2,3-dioxygenase 1 (IDO1), indoleamine 2,3-dioxygenase 2 (IDO2), and tryptophan 2,3-dioxygenase (TDO) initiate the first step of the kynurenine pathway (KP), leading to the transformation of l-tryptophan (Trp) into l-kynurenine (Kyn) and other downstream metabolites. Kyn is known as an endogenous ligand of the aryl hydrocarbon receptor (AhR). Activation of AhR through TDO-derived Kyn is a novel mechanism to support tumor growth in gliomas. However, the role of IDO1 and IDO2 in this mechanism is still unknown. Herein, by using clinical samples, we found that the expression and activity of IDO1 and/or TDO (IDO1/TDO) rather than IDO2 were positively correlated with the pathologic grades of gliomas. The expression of IDO1/TDO rather than IDO2 was positively correlated with the Ki67 index and overall survival. The expression of IDO1/TDO was positively correlated with the expression of aquaporin 4 (AQP4), implying the potential involvement of IDO1/TDO in glioma cell motility. Mechanistically, we found that IDO1/TDO accounted for the release of Kyn, which activated AhR to promote cell motility via the Kyn-AhR-AQP4 signaling pathway in U87MG glioma cells. RY103, an IDO1/TDO dual inhibitor, could block the IDO1/TDO-Kyn-AhR-AQ...Continue Reading

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Citations

Jul 3, 2020·Frontiers in Immunology·Lijie ZhaiDerek A Wainwright
Feb 10, 2021·Journal of Experimental & Clinical Cancer Research : CR·Yu YaoQing Yang
Feb 3, 2021·European Journal of Pharmacology·Moein Ala
Jan 17, 2021·International Journal of Molecular Sciences·Anaïs ParisSébastien Corre

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Methods Mentioned

BETA
immunoprecipitation
transfection
fluorescence microscopy
blood collection
PCR
Protein Assay

Software Mentioned

Paravision
ImageJ
ARRIVE
SPSS

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