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Critical Care
Published in: Critical Care 1/2017

Open Access 01-12-2017 | Research

Monocyte programmed death ligand-1 expression is an early marker for predicting infectious complications in acute pancreatitis

Authors: Tingting Pan, Tianyun Zhou, Lei Li, Zhaojun Liu, Ying Chen, Enqiang Mao, Meiling Li, Hongping Qu, Jialin Liu

Published in: Critical Care | Issue 1/2017

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Abstract

Background

Acute pancreatitis (AP) is a life-threatening disease that requires early identification of patients at risk of developing infectious complications. Immunosuppression is an initial event that is key to AP pathogenesis. The programmed cell death 1 (PD-1) and programmed cell death ligand 1 (PD-L1) system is reported to mediate evasion of host immune surveillance in many diseases; however, the relationship between PD-1/PD-L1 expression and these parameters or infectious complications in AP has not been elucidated. This study was conducted to determine whether PD-1 and PD-L1 are upregulated and to reveal the relationship between PD-1/PD-L1 expression and the development of infectious complications in AP.

Methods

Sixty-three patients with AP and 32 sex- and age-matched healthy control subjects were prospectively enrolled. On days 1 and 3 after the onset of AP, we measured PD-1 expression in peripheral CD4+ T cells and PD-L1 and human leukocyte antigen-DR (HLA-DR) expression in CD14+ monocytes using flow cytometry. Plasma interleukin (IL)-10 levels were measured by enzyme-linked immunosorbent assay.

Results

Compared with healthy volunteers, the percentages of PD-1-expressing CD4+ lymphocytes and PD-L1-expressing CD14+ monocytes were increased in patients with AP on days 1 and 3 after onset, especially those with infectious complications. Moreover, increased PD-1/PD-L1 expression was associated with increased occurrence of infectious complications, decreased circulating lymphocytes, and increased plasma IL-10 concentration. Multivariate regression analysis indicated that the increased percentage of PD-L1-expressing CD14+ monocytes was an independent risk factor for infectious complications in AP. Area under the ROC curve analysis showed the combination of Acute Physiology and Chronic Health Evaluation II score and PD-L1 and HLA-DR expression in CD14+ monocytes had high accuracy in predicting infectious complications in patients with AP.

Conclusions

The PD-1/PD-L1 system plays an essential role in the early immunosuppression of AP. PD-L1 expression in CD14+ monocytes may be a new marker for predicting risk of infectious complications in patients with AP.
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Metadata
Title
Monocyte programmed death ligand-1 expression is an early marker for predicting infectious complications in acute pancreatitis
Authors
Tingting Pan
Tianyun Zhou
Lei Li
Zhaojun Liu
Ying Chen
Enqiang Mao
Meiling Li
Hongping Qu
Jialin Liu
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Critical Care / Issue 1/2017
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/s13054-017-1781-3

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