Not Only Immune Escape—The Confusing Role of the TRP Metabolic Pathway in Carcinogenesis

Author:

Kwiatkowska IwonaORCID,Hermanowicz Justyna MagdalenaORCID,Przybyszewska-Podstawka AlicjaORCID,Pawlak DariuszORCID

Abstract

Background: The recently discovered phenomenon that cancer cells can avoid immune response has gained scientists’ interest. One of the pathways involved in this process is tryptophan (TRP) metabolism through the kynurenine pathway (KP). Individual components involved in TRP conversion seem to contribute to cancerogenesis both through a direct impact on cancer cells and the modulation of immune cell functionality. Due to this fact, this pathway may serve as a target for immunotherapy and attempts are being made to create novel compounds effective in cancer treatment. However, the results obtained from clinical trials are not satisfactory, which raises questions about the exact role of KP elements in tumorigenesis. An increasing number of experiments reveal that TRP metabolites may either be tumor promoters and suppressors and this is why further research in this field is highly needed. The aim of this study is to present KP as a modulator of cancer development through multiple mechanisms and to point to its ambiguity, which may be a reason for failures in treatment based on the inhibition of tryptophan metabolism

Funder

Uniwersytet Medyczny w Białymstoku

Publisher

MDPI AG

Subject

Cancer Research,Oncology

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