期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-34722-7
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资金
- National Key Research and Development Program of China [2022YFC2303000, 2021YFC2300400]
- National Natural Science Foundation of China [31970889]
- Innovation Program of Shanghai Municipal Education Commission [201901070007E00022]
- Key fund for basic research of Shanghai Science and Technology Commission [20JC1417700]
- Shanghai laboratory animal research fund [21140903300]
- Outstanding Research Project of Shanghai Municipal Health Commission [20224Z0020]
Programmed death ligand 1 (PD-L1) regulates chemokine secretion to control neutrophil mobilization during Candida albicans infection. PD-L1 expression leads to neutrophil accumulation in bone marrow, enhancing host resistance to the infection. Blocking PD-L1 can enhance neutrophil release and improve host antifungal immunity.
Programmed death ligand 1 (PD-L1) has been shown to be inducibly expressed on neutrophils to suppress host immunity during polymicrobial sepsis, virus and parasite infections. However, the role of PD-L1 on neutrophil-mediated antifungal immunity remains wholly unknown. Here, we show that the expression of PD-L1 on murine and human neutrophils was upregulated upon the engagement of C-type lectin receptor Dectin-1 with its ligand beta-glucans, exposed on fungal pathogen Candida albicans yeast. Moreover, beta-glucan stimulation induced PD-L1 translocation into nucleus to regulate the production of chemokines CXCL1 and CXCL2, which control neutrophil mobilization. Importantly, C. albicans infection-induced expression of PD-L1 leads to neutrophil accumulation in bone marrow, through mediating their autocrine secretion of CXCL1/2. Furthermore, neutrophil-specific deficiency of PD-L1 impaired CXCL1/2 secretion, which promoted neutrophil migration from bone marrow into the peripheral circulation, thereby conferring host resistance to C. albicans infection. Finally, either PD-L1 blockade or pharmacological inhibition of PD-L1 expression significantly increased neutrophil release from bone marrow to enhance host antifungal immunity. Our data together indicate that activation of Dectin-1/PD-L1 cascade by beta-glucans inhibits neutrophil release from bone marrow reserve, contributing to the negative regulation of antifungal innate immunity, which functions as a potent immunotherapeutic target against life-threatening fungi infections. Programmed death ligand 1 (PD-L1) suppresses host immunity during infection and microbial sepsis. Here, the authors show that PD-L1 does this by regulating the secretion of CXCL1 and CXCL2 to control neutrophil mobilization during Candida albicans infection.
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