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阻断PD1和TIM3可以恢复急性酒精性肝炎患者的固有免疫和适应性免疫

作者:陈亚云 编译 来源:医学论坛网 日期:2015-02-27
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         Blockade of PD1 and TIM3 Restores Innate and Adaptive Immunity in Patients With Acute Alcoholic Hepatitis Lee J.L. Markwick,Antonio Riva,Jennifer M. Ryan,Helen Cooksley,Elena Palma,Tom H. Tranah,God

 

Blockade of PD1 and TIM3 Restores Innate and Adaptive Immunity in Patients With Acute Alcoholic Hepatitis

Lee J.L. MarkwickAntonio RivaJennifer M. RyanHelen CooksleyElena PalmaTom H. TranahGodhev K. Manakkat VijayNikhil VergisMark ThurszAlex EvansGavin WrightSarah TarffJohn O’GradyRoger WilliamsDebbie L. Shawcross§Shilpa Chokshi §

Background & Aims

Susceptibility to bacterial infection is a feature of alcohol-related liver disease. Programmed cell death 1 (PD1), the T-cell immunoglobulin and mucin domain–containing protein 3 (TIM3, also known as hepatitis A virus cellular receptor 2), and their respective ligands—CD274 (also known as PD ligand 1 [PDL1]) and galectin-9—are inhibitory receptors that regulate the balance between protective immunity and host immune-mediated damage. However, their sustained hyperexpression promotes immune exhaustion and paralysis. We investigated the role of these immune inhibitory receptors in driving immune impairments in patients with alcoholic liver disease.

Methods

In a prospective study, we collected blood samples from 20 patients with acute alcoholic hepatitis (AAH), 16 patients with stable advanced alcohol-related cirrhosis, and 12 healthy individuals (controls). Whole blood or peripheral blood mononuclear cells were assessed for expression of PD1, PDL1, TIM3, galectin-9, and Toll-like receptors on subsets of innate and adaptive immune effector cells. We measured antibacterial immune responses to lipopolysaccharide (endotoxin) using ELISpot assays, and used flow cytometry to quantify cytokine production, phagocytosis, and oxidative burst in the presence or absence of blocking antibodies against PD1 or TIM3.

Results

Antibacterial innate and adaptive immune responses were greatly reduced in patients with AAH, compared with controls, and patients with alcohol-related cirrhosis had less severe dysfunctions in innate immune effector cells and preserved functional T-cell responses. Fewer T cells from patients with AAH produced interferon gamma in response to lipopolysaccharide, compared with controls. In addition, patients with AAH had greater numbers of interleukin 10–producing T cells, and reduced levels of neutrophil phagocytosis and oxidative burst in response to Escherichia colistimulation, compared with controls. T cells from patients with AAH, but not alcohol-related cirrhosis, expressed higher levels of PD1 and PDL1, or TIM3 and galectin-9, than T cells from controls. Antibodies against PD1 and TIM3 restored T-cell production of interferon gamma, reduced the numbers of interleukin 10–producing T cells, and increased neutrophil antimicrobial activities. Circulating levels of endotoxin in plasma from patients with AAH caused over expression of immune inhibitory receptors on T cells via Toll-like receptor 4 binding to CD14+ monocytes.

Conclusions

Antibacterial immune responses are impaired in patients with AAH. Lymphocytes from these patients express high levels of immune inhibitory receptors, produce lower levels of interferon gamma, and have increased IL10 production due to chronic endotoxin exposure. These effects can be reversed by blocking PD1 and TIM3, which increase the antimicrobial activities of T cells and neutrophils.

March 2015Volume 148, Issue 3, Pages 590–602.e10

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