Relationship between expression of PD-L1 and PD-L2 on esophageal squamous cell carcinoma and the antitumor effects of CD8+ T cells

  • Authors:
    • Changsen Leng
    • Yin Li
    • Jianjun Qin
    • Jun Ma
    • Xianben Liu
    • Yingying Cui
    • Haibo Sun
    • Zongfei Wang
    • Xionghuai Hua
    • Yongkui Yu
    • Haomiao Li
    • Jun Zhang
    • Yan Zheng
    • Wei Wang
    • Junwei Zhu
    • Qiuming Wang
  • View Affiliations

  • Published online on: November 17, 2015     https://doi.org/10.3892/or.2015.4435
  • Pages: 699-708
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Abstract

The programmed death-1 (PD-1)/programmed death-ligands (PD-Ls) signal pathway has been implicated as a potential immune escape mechanism in several human cancers. However, the studies of PD‑1/PD‑Ls pathway in esophageal squamous cell carcinoma (ECSS) are not yet sufficient. The current study investigated the expression of PD‑L1, PD‑L2 and PD‑1 in ESCC tissues. The correlations between the expression of these proteins and clinical histopathological parameters were analyzed. Then the stable transfected Ec109 cell lines overexpressing PD‑L1/PD‑L2 were established by plasmid transfection successfully. Ec109 and CD8+ T cells were co‑cultured to analyze the effects of PD‑1/PD‑Ls signal pathway on the function of CD8+ T cells including proliferation, apoptosis and interferon‑γ production. We found that PD‑L1-positive patients had significantly poorer prognosis than the negative patients, while their prognosis was not related to PD‑L2 expression. The count of PD‑1+ TILs (tumor‑infiltrating lymphocytes) was negatively correlated with both PD‑L1 and PD‑L2 expression. In functional studies, we found that PD‑1/PD‑Ls signal pathway was able to downregulate the function of CD8+ T lymphocyte and its function could be restored by blocking the signal pathway. This indicates that PD‑1/PD‑Ls may prevent effective antitumor immunity, which provides important evidence to delineate the cellular immune deficiency mechanism in ESCC. Therefore, PD-1/PD-Ls are predicted to become novel targets for ESCC immunotherapy.
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February-2016
Volume 35 Issue 2

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Leng C, Li Y, Qin J, Ma J, Liu X, Cui Y, Sun H, Wang Z, Hua X, Yu Y, Yu Y, et al: Relationship between expression of PD-L1 and PD-L2 on esophageal squamous cell carcinoma and the antitumor effects of CD8+ T cells. Oncol Rep 35: 699-708, 2016
APA
Leng, C., Li, Y., Qin, J., Ma, J., Liu, X., Cui, Y. ... Wang, Q. (2016). Relationship between expression of PD-L1 and PD-L2 on esophageal squamous cell carcinoma and the antitumor effects of CD8+ T cells. Oncology Reports, 35, 699-708. https://doi.org/10.3892/or.2015.4435
MLA
Leng, C., Li, Y., Qin, J., Ma, J., Liu, X., Cui, Y., Sun, H., Wang, Z., Hua, X., Yu, Y., Li, H., Zhang, J., Zheng, Y., Wang, W., Zhu, J., Wang, Q."Relationship between expression of PD-L1 and PD-L2 on esophageal squamous cell carcinoma and the antitumor effects of CD8+ T cells". Oncology Reports 35.2 (2016): 699-708.
Chicago
Leng, C., Li, Y., Qin, J., Ma, J., Liu, X., Cui, Y., Sun, H., Wang, Z., Hua, X., Yu, Y., Li, H., Zhang, J., Zheng, Y., Wang, W., Zhu, J., Wang, Q."Relationship between expression of PD-L1 and PD-L2 on esophageal squamous cell carcinoma and the antitumor effects of CD8+ T cells". Oncology Reports 35, no. 2 (2016): 699-708. https://doi.org/10.3892/or.2015.4435