The inhibition of indoleamine 2, 3-dioxygenase 1 by connexin 43

International Journal of Medical Sciences
Han-Chen LinChe-Hsin Lee

Abstract

Upregulation of connexin 43 (Cx43) showed potential in enhancing immune surveillance that was suppressed in the tumor microenvironment. The expression of indoleamine 2, 3-dioxygenase (IDO) is one of the crucial factors contributing to tumor immune tolerance by depletion of tryptophan and IDO-mediated tryptophan metabolites. Here, we aim to investigate the role of Cx43 in IDO production in murine tumor by using Cx43 inducers. Resveratrol (trans-3, 5, 4 '-trihydroxystilbene) is a natural plant-derived polyphenol possessing positive effect against cancer. Salmonella enterica serovar choleraesuis (S.C.) was proved to target and inhibit tumor growth. Both of them regulated Cx43 expression in tumor cells and led to either chemosensitizing or immune-activating. In this study, the correlation between Cx43 and IDO were determined by the treatment of resveratrol and S.C. Our data showed an increase in Cx43 while IDO protein and IDO-mediated inhibited effects on T cell decreased after tumor cells are given with resveratrol and S.C. All of which could be inhibited once the expression of Cx43 was blocked. Cx43 involved in IDO regulation might be useful in developing IDO-targeted cancer immune therapy.

Citations

Dec 13, 2019·Experimental & Molecular Medicine·Mai Thi-Quynh DuongJung-Joon Min
Nov 9, 2018·Nature Reviews. Cancer·Shibin ZhouKe Liu
Mar 24, 2021·Cancer Gene Therapy·Zeynab MarzhoseyniHamed Mirzaei
Dec 12, 2020·Trends in Cancer·Brendan Fu-Long SieowMatthew Wook Chang
May 13, 2021·Seminars in Cancer Biology·Deepti DiwanVijai Kumar Gupta
May 22, 2021·Seminars in Cancer Biology·Mohd SaeedFarrukh Aqil

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transfection
protein assay

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