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Intrahepatic Expression of Programmed Death-1 and its Ligands in Patients with HBV-Related Acute-on-Chronic Liver Failure

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Abstract

Hepatitis B virus (HBV) infection is a major public health problem, and HBV-related acute-on-chronic liver failure (HBV-ACLF) has an extremely poor prognosis due to a lack of understanding of pathogenesis as well as a lack of effective treatments. Signals from the inhibitory receptor programmed death-1 (PD-1) have been demonstrated to be involved in regulating the pathogenesis of infectious diseases. However, the expression of PD-1 and its ligands in HBV-ACLF patients has yet to be evaluated. In this study, the expression of PD-1 and its ligands, PD-L1 and PD-L2, in liver biopsies from HBV-ACLF as well as chronic hepatitis B (CHB) patients were analyzed by immunohistochemistry. The results showed that all three molecules were observed in the HBV-ACLF samples and their levels were significantly higher than they were in CHB. Immunofluorescence double-staining showed that PD-1 was found on CD3+, CD8+ T cells, CD56+ NK cells, CD68+ macrophages, CK-18+ epithelial cells, and CD16+ monocytes. The PD-L1 expression was observed on all cell types detected and the PD-L2 was chiefly on CK-18+ epithelial cells and CD31+ endothelial cells. Interestingly, high levels of virus-induced procoagulant molecule fibrinogen-like protein 2 (FGL2) were observed in liver sections from HBV-ACLF, and PD-L1 and PD-L2 expression was also observed on FGL2+ cells in these patients. Our combined results suggest that the expression of PD-L1 and PD-L2 may be biomarkers to identify and diagnose ACLF, and a clear understanding of their functional roles should further elucidate the pathogenesis of this disease.

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Acknowledgments

This work was supported by grants from the National Natural Science Foundation of China (NSFC No. 81171585, 30872374 and 61141012).

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None of the authors have any conflicts of interest related to this manuscript.

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Correspondence to Yongwen Chen.

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Dayan Cao and Huan Xu are equally to this work.

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Cao, D., Xu, H., Guo, G. et al. Intrahepatic Expression of Programmed Death-1 and its Ligands in Patients with HBV-Related Acute-on-Chronic Liver Failure. Inflammation 36, 110–120 (2013). https://doi.org/10.1007/s10753-012-9525-7

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