PMID- 30761136 OWN - NLM STAT- MEDLINE DCOM- 20191231 LR - 20200309 IS - 1664-3224 (Electronic) IS - 1664-3224 (Linking) VI - 10 DP - 2019 TI - Resistance and Tolerance to Cryptococcal Infection: An Intricate Balance That Controls the Development of Disease. PG - 66 LID - 10.3389/fimmu.2019.00066 [doi] LID - 66 AB - Cryptococcus neoformans is a ubiquitous environmental yeast and a leading cause of invasive fungal infection in humans. The most recent estimate of global disease burden includes over 200,000 cases of cryptococcal meningitis each year. Cryptococcus neoformans expresses several virulence factors that may have originally evolved to protect against environmental threats, and human infection may be an unintended consequence of these acquired defenses. Traditionally, C. neoformans has been viewed as a purely opportunistic pathogen that targets severely immune compromised hosts; however, during the past decade the spectrum of susceptible individuals has grown considerably. In addition, the closely related strain Cryptococcus gattii has recently emerged in North America and preferentially targets individuals with intact immunity. In parallel to the changing epidemiology of cryptococcosis, an increasing role for host immunity in the pathogenesis of severe disease has been elucidated. Initially, the HIV/AIDS epidemic revealed the capacity of C. neoformans to cause host damage in the absence of adaptive immunity. Subsequently, the development and clinical implementation of highly active antiretroviral treatment (HAART) led to recognition of an immune reconstitution inflammatory syndrome (IRIS) in a subset of HIV+ individuals, demonstrating the pathological role of host immunity in disease. A post-infectious inflammatory syndrome (PIIRS) characterized by abnormal T cell-macrophage activation has also been documented in HIV-negative individuals following antifungal therapy. These novel clinical conditions illustrate the highly complex host-pathogen relationship that underlies severe cryptococcal disease and the intricate balance between tolerance and resistance that is necessary for effective resolution. In this article, we will review current knowledge of the interactions between cryptococci and mammalian hosts that result in a tolerant phenotype. Future investigations in this area have potential for translation into improved therapies for affected individuals. FAU - Shourian, Mitra AU - Shourian M AD - Translational Research in Respiratory Diseases Program, Meakins-Christie Laboratories, Research Institute of the McGill University Health Centre, Montreal, QC, Canada. AD - Division of Experimental Medicine, Department of Medicine, McGill University Health Centre, Montreal, QC, Canada. FAU - Qureshi, Salman T AU - Qureshi ST AD - Translational Research in Respiratory Diseases Program, Meakins-Christie Laboratories, Research Institute of the McGill University Health Centre, Montreal, QC, Canada. AD - Division of Experimental Medicine, Department of Medicine, McGill University Health Centre, Montreal, QC, Canada. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20190129 PL - Switzerland TA - Front Immunol JT - Frontiers in immunology JID - 101560960 RN - 0 (IL10 protein, human) RN - 0 (Virulence Factors) RN - 130068-27-8 (Interleukin-10) SB - IM MH - Adaptation, Physiological MH - Animals MH - CD4-Positive T-Lymphocytes/immunology MH - Cryptococcus gattii/immunology MH - Cryptococcus neoformans/*immunology/*pathogenicity MH - Dendritic Cells/immunology MH - Disease Resistance/*immunology MH - Host-Pathogen Interactions MH - Humans MH - Immune Reconstitution Inflammatory Syndrome/microbiology MH - Immune Tolerance/*immunology MH - Interleukin-10/metabolism MH - Meningitis, Cryptococcal/*microbiology MH - Mice MH - Virulence Factors/metabolism PMC - PMC6361814 OTO - NOTNLM OT - Cryptococcus OT - asymptomatic infection OT - damage response framework OT - disease tolerance OT - host-pathogen interaction OT - immunoregulation EDAT- 2019/02/15 06:00 MHDA- 2020/01/01 06:00 PMCR- 2019/01/01 CRDT- 2019/02/15 06:00 PHST- 2018/09/17 00:00 [received] PHST- 2019/01/11 00:00 [accepted] PHST- 2019/02/15 06:00 [entrez] PHST- 2019/02/15 06:00 [pubmed] PHST- 2020/01/01 06:00 [medline] PHST- 2019/01/01 00:00 [pmc-release] AID - 10.3389/fimmu.2019.00066 [doi] PST - epublish SO - Front Immunol. 2019 Jan 29;10:66. doi: 10.3389/fimmu.2019.00066. eCollection 2019.