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Interleukin-35 Suppresses CD8+ T Cell Activity in Patients with Viral Hepatitis-Induced Acute-on-Chronic Liver Failure

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Abstract

Background

Interleukin (IL)-35 is a newly indentified cytokine and induces immunotolerance via suppression of CD8+ T cell activity in chronic viral hepatitis.

Aims

To investigate the modulatory function of IL-35 to CD8+ T cells in viral hepatitis-induced acute-on-chronic liver failure (ACLF).

Methods

Fifty-five ACLF patients and 21 healthy controls were enrolled. Serum IL-35 concentration was measured by ELISA. Absolute accounts for T cells, immune checkpoint molecules, and cytotoxic molecules in CD8+ T cells were measured by flow cytometry and real-time PCR, respectively. Direct and indirect contact co-culture systems between CD8+ T cells and HepG2 cells were set up. The regulatory function of IL-35 to CD8+ T cells was assessed by measuring lactate dehydrogenase expression and cytokine production.

Results

Serum IL-35 concentration was elevated in ACLF patients and positively correlated with total bilirubin, but negatively correlated with prothrombin time activity. Peripheral CD8+ T cells showed exhausted phenotype in ACLF patients, which manifested as up-regulation of programmed death-1 (PD-1), cytotoxic T-lymphocyte-associated protein-4 (CTLA-4), and lymphocyte activation gene-3 (LAG-3) but down-regulation of perforin, granzyme B, and FasL. Recombinant IL-35 stimulation dampened cytotoxicity and interferon-γ production in both direct and indirect contact co-culture systems. This process was accompanied by elevation of PD-1, CTLA-4, and LAG3, as well as reduction of perforin, granzyme B, and FasL in CD8+ T cells.

Conclusion

Elevated IL-35 suppressed both cytolytic and non-cytolytic activity of CD8+ T cells in ACLF patients.

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Abbreviations

ACLF:

Acute-on-chronic liver failure

CTLA-4:

Cytotoxic T-lymphocyte-associated protein-4

ELISA:

Enzyme-linked immunosorbent assay

HBV:

Hepatitis B virus

HCC:

Hepatocellular carcinoma

HCV:

Hepatitis C virus

IFN-γ:

Interferon-γ

IL:

Interleukin

LAG-3:

Lymphocyte activation gene-3

LDH:

Lactate dehydrogenase

MIP-1α:

Macrophage inflammatory protein-1α

NC:

Normal control

PBMC:

Peripheral blood mononuclear cells

PD-1:

Programmed death-1

PTA:

Prothrombin time activity

T-BIL:

Total bilirubin

TNF-α:

Tumor necrosis factor-α

Tregs:

Regulatory T cells

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Funding

This work was funded by the grant from Natural Science Foundation of Jilin Province (No. 20190201047JC) and the grant from Special Health Project of Jilin Province Department of Finance.

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Correspondence to Zhenjing Jin.

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The authors declare that they have no conflict of interest.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the Ethics Committee of The Second Hospital of Jilin University and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.

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Yang, L., Zhang, Q., Song, J. et al. Interleukin-35 Suppresses CD8+ T Cell Activity in Patients with Viral Hepatitis-Induced Acute-on-Chronic Liver Failure. Dig Dis Sci 65, 3614–3623 (2020). https://doi.org/10.1007/s10620-020-06077-w

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  • DOI: https://doi.org/10.1007/s10620-020-06077-w

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