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Article

IDO inhibitor synergized with radiotherapy to delay tumor growth by reversing T cell exhaustion

  • Authors:
    • Meng Liu
    • Ziyang Li
    • Weirong Yao
    • Xiaoping Zeng
    • Lingyun Wang
    • Jiao Cheng
    • Bingyu Ma
    • Ruiqian Zhang
    • Weiping Min
    • Hongmei Wang
  • View Affiliations / Copyright

    Affiliations: Departments of Pathophysiology and Immunology, School of Basic Medical Sciences, Nanchang University, Nanchang, Jiangxi 330006, P.R. China, Department of Oncology, Jiangxi Provincial People's Hospital, Nanchang, Jiangxi 330006, P.R. China
  • Pages: 445-453
    |
    Published online on: November 12, 2019
       https://doi.org/10.3892/mmr.2019.10816
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Abstract

Previous studies suggest that radiotherapy (RT) can induce immune activation, which not only reduces the progression of tumors, but also causes the release of tumor antigens. The combination of RT and immune checkpoint blockade, such as the inhibition of programmed cell death 1 (PD‑1) and programmed cell death ligand 1 (PD‑L1), has been demonstrated to yield impressive response rates. However, a substantial proportion of patients develop resistance such therapies. Previous studies have shown that indoleamine 2,3‑dioxygenase (IDO) causes T cell exhaustion and increased formation of regulatory T cells (Tregs), upregulating the expression of inhibitory receptors and ligands. Therefore, the application of IDO inhibitors combined with RT may have a synergistic effect by relieving immunosuppression. Lewis lung cancer cell‑bearing mice were treated with the IDO inhibitor 1‑methyl‑tryptophan (1MT) and/or 10 Gy RT. Tumor size was measured every day, flow cytometry was performed to measure the expression of dendritic cell (DC) maturation markers, inhibitory receptors, ligands, cytotoxic T cells and Treg phenotypic markers. Reverse transcription‑quantitative PCR was used to evaluate the mRNA expression levels of IDO, PD‑L1, PD‑1, T cell immunoglobulin domain and mucin domain 3 (TIM‑3), B‑ and T‑lymphocyte attenuator (BTLA) and galectin‑9. Compared with the control group, treatment with 1MT or RT reduced tumor growth, however, the combination therapy was more effective than either treatment alone. Flow cytometry showed the upregulation of CD80, CD86 and the major histocompatibility complex II in spleen DCs and the concurrent downregulation of CD4, CD25 and forkhead box protein P3 in lymphocytes in the treatment groups. Compared with the control group, inhibitory receptors and ligands that affect DCs and T cells were observed, expression levels of PD‑L1, PD‑1, TIM‑3, BTLA and galectin‑9 are decreased in treatment group compared with control. IDO inhibition synergized with RT to downregulate Tregs, inhibitory receptors and ligands to prevent T cell exhaustion. By activating DCs and T cells, this combination therapy may strongly enhance antitumor immunity and inhibit tumor progression.
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Copy and paste a formatted citation
Spandidos Publications style
Liu M, Li Z, Yao W, Zeng X, Wang L, Cheng J, Ma B, Zhang R, Min W, Wang H, Wang H, et al: IDO inhibitor synergized with radiotherapy to delay tumor growth by reversing T cell exhaustion. Mol Med Rep 21: 445-453, 2020.
APA
Liu, M., Li, Z., Yao, W., Zeng, X., Wang, L., Cheng, J. ... Wang, H. (2020). IDO inhibitor synergized with radiotherapy to delay tumor growth by reversing T cell exhaustion. Molecular Medicine Reports, 21, 445-453. https://doi.org/10.3892/mmr.2019.10816
MLA
Liu, M., Li, Z., Yao, W., Zeng, X., Wang, L., Cheng, J., Ma, B., Zhang, R., Min, W., Wang, H."IDO inhibitor synergized with radiotherapy to delay tumor growth by reversing T cell exhaustion". Molecular Medicine Reports 21.1 (2020): 445-453.
Chicago
Liu, M., Li, Z., Yao, W., Zeng, X., Wang, L., Cheng, J., Ma, B., Zhang, R., Min, W., Wang, H."IDO inhibitor synergized with radiotherapy to delay tumor growth by reversing T cell exhaustion". Molecular Medicine Reports 21, no. 1 (2020): 445-453. https://doi.org/10.3892/mmr.2019.10816
Copy and paste a formatted citation
x
Spandidos Publications style
Liu M, Li Z, Yao W, Zeng X, Wang L, Cheng J, Ma B, Zhang R, Min W, Wang H, Wang H, et al: IDO inhibitor synergized with radiotherapy to delay tumor growth by reversing T cell exhaustion. Mol Med Rep 21: 445-453, 2020.
APA
Liu, M., Li, Z., Yao, W., Zeng, X., Wang, L., Cheng, J. ... Wang, H. (2020). IDO inhibitor synergized with radiotherapy to delay tumor growth by reversing T cell exhaustion. Molecular Medicine Reports, 21, 445-453. https://doi.org/10.3892/mmr.2019.10816
MLA
Liu, M., Li, Z., Yao, W., Zeng, X., Wang, L., Cheng, J., Ma, B., Zhang, R., Min, W., Wang, H."IDO inhibitor synergized with radiotherapy to delay tumor growth by reversing T cell exhaustion". Molecular Medicine Reports 21.1 (2020): 445-453.
Chicago
Liu, M., Li, Z., Yao, W., Zeng, X., Wang, L., Cheng, J., Ma, B., Zhang, R., Min, W., Wang, H."IDO inhibitor synergized with radiotherapy to delay tumor growth by reversing T cell exhaustion". Molecular Medicine Reports 21, no. 1 (2020): 445-453. https://doi.org/10.3892/mmr.2019.10816
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