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J. Fungi 2017, 3(4), 55;

The Multifaceted Role of T-Helper Responses in Host Defense against Aspergillus fumigatus

Department of Experimental Internal Medicine and Radboud Center for Infectious diseases (RCI), Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands
Faculty of Medicine Universitas Padjadjaran, Jl. Eijkman No. 38, Bandung 40161, Indonesia
Author to whom correspondence should be addressed.
Received: 1 September 2017 / Revised: 28 September 2017 / Accepted: 30 September 2017 / Published: 4 October 2017
(This article belongs to the Special Issue Mucosal Fungal Infections)
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The ubiquitous opportunistic fungal pathogen Aspergillus fumigatus rarely causes infections in immunocompetent individuals. A healthy functional innate immune system plays a crucial role in preventing Aspergillus-infection. This pivotal role for the innate immune system makes it a main research focus in studying the pathogenesis of aspergillosis. Although sometimes overshadowed by the innate immune response, the adaptive immune response, and in particular T-helper responses, also represents a key player in host defense against Aspergillus. Virtually all T-helper subsets have been described to play a role during aspergillosis, with the Th1 response being crucial for fungal clearance. However; morbidity and mortality of aspergillosis can also be partly attributed to detrimental immune responses resulting from adaptive immune activation. Th2 responses benefit fungal persistence; and are the foundation of allergic forms of aspergillosis. The Th17 response has two sides; although crucial for granulocyte recruitment, it can be involved in detrimental immunopathology. Regulatory T-cells, the endogenous regulators of inflammatory responses, play a key role in controlling detrimental inflammatory responses during aspergillosis. The current knowledge of the adaptive immune response against A. fumigatus is summarized in this review. A better understanding on how T-helper responses facilitate clearance of Aspergillus-infection and control inflammation can be the fundamental basis for understanding the pathogenesis of aspergillosis and for the development of novel host-directed therapies. View Full-Text
Keywords: aspergillosis; T-helper cells; adaptive immune response; immunopathology aspergillosis; T-helper cells; adaptive immune response; immunopathology

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Dewi, I.M.W.; van de Veerdonk, F.L.; Gresnigt, M.S. The Multifaceted Role of T-Helper Responses in Host Defense against Aspergillus fumigatus. J. Fungi 2017, 3, 55.

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