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Ann Surg Oncol. 2019 Mar;26(3):884-893. doi: 10.1245/s10434-018-07117-6. Epub 2018 Dec 18.

MiR-21 Participates in the PD-1/PD-L1 Pathway-Mediated Imbalance of Th17/Treg Cells in Patients After Gastric Cancer Resection.

Author information

1
Department of Anaesthesiology, Harbin Medical University Cancer Hospital, Harbin, China.
2
Department of Thoracic Surgery, Harbin Medical University Cancer Hospital, Harbin, China.
3
Department of Anaesthesiology, Harbin Medical University Cancer Hospital, Harbin, China. guonianwang@163.com.
4
Pain Research Institute of Heilongjiang Academy of Medical Sciences, Harbin, China. guonianwang@163.com.

Abstract

BACKGROUND:

The programmed cell death-1/programmed cell death-ligand 1 (PD-1/PD-L1) pathway has been shown to be involved in trauma-induced immunosuppression and to influence CD4+ T cell differentiation. MicroRNA (miR)-21 is a critical player in immune responses. However, it remains largely unknown whether miR-21 is regulated by PD-1 and influences CD4+ T-cell lineage choice after gastric cancer resection.

METHODS:

In the present study, we analyzed the percentages of T-helper (Th)-17/regulatory T (Treg) cells and PD-1/PD-L1 expression on peripheral blood mononuclear cells (PBMCs) during the perioperative period. We also detected the secretion of interleukin (IL)-17 and transforming growth factor (TGF)-β1 using enzyme-linked immunosorbent assays (ELISAs). Furthermore, PBMCs isolated from patients were transfected with or without adenovirus-short hairpin-PD-1 (Ad-sh-PD1), pre-miR-21 or adenovirus-green fluorescent protein (Ad-GFP), and the percentages of Th17/Treg cells and related transcription factors were measured.

RESULTS:

In patients who underwent gastric cancer resection, the number of Th17 cells decreased, whereas the number of Treg cells increased, accompanied by an increased expression of PD-1/PD-L1. In addition, the expression of RORγt and IL-17 decreased, whereas the expression of Foxp3 and TGF-β1 increased. In vitro, silencing PD-1 via Ad-sh-PD1 promoted the expression of miR-21 and increased the percentage of Th17 cells, but decreased the percentage of Treg cells. The overexpression of miR-21 increased the percentage of Th17 cells but decreased the percentage of Treg cells.

CONCLUSIONS:

Our study demonstrated that gastric cancer resection altered the balance of Th17/Treg cells and increased PD-1/PD-L1 expression. In the in vitro experiments, the transfection of Ad-sh-PD1 ameliorated Th17/Treg cell imbalance partially by increasing the expression of miR-21.

PMID:
30565043
DOI:
10.1245/s10434-018-07117-6

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