TNF-α-Producing Exerts Protective Effects on Host Defenses in Murine Pulmonary Cryptococcosis.

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ID: 4885
2019
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Abstract
Tumor necrosis factor alpha (TNF-α) plays a critical role in the control of cryptococcal infection, and its insufficiency promotes cryptococcal persistence. To explore the therapeutic potential of TNF-α supplementation as a booster of host anti-cryptococcal responses, we engineered a strain expressing murine TNF-α. Using a murine model of pulmonary cryptococcosis, we demonstrated that TNF-α-producing strain enhances protective elements of host response including preferential T-cell accumulation and improved Th1/Th2 cytokine balance, diminished pulmonary eosinophilia and alternative activation of lung macrophages at the adaptive phase of infection compared to wild type strain-infected mice. Furthermore, TNF-α expression by enhanced the fungicidal activity of macrophages . Finally, mice infected with the TNF-α-producing strain showed improved fungal control and considerably prolonged survival compared to wild type strain-infected mice, but could not induce sterilizing immunity. Taken together, our results support that TNF-α expression by an engineered strain while insufficient to drive complete immune protection, strongly enhanced protective responses during primary cryptococcal infection.
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Authors Fa, Zhenzong;Xu, Jintao;Yi, Jiu;Sang, Junjun;Pan, Weihua;Xie, Qun;Yang, Runping;Fang, Wei;Liao, Wanqing;Olszewski, Michal A;
Journal Frontiers in immunology
Year 2019
DOI
10.3389/fimmu.2019.01725
URL
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