Candida Invasion of Endothelium and Virulence Abstract The incidence of bloodstream infections caused by Candida species has increased dramatically; these organisms now account for 10% of all bloodstream isolates. The mortality associated with candidemia approaches 40%, even with therapy. Because of this unacceptably high mortality, new strategies to treat and prevent this infection are necessary. Our goal is to identify new Candida albicans virulence genes and to determine the mechanisms by which they contribute to pathogenicity. This information holds promise to identify new targets for antifungal strategies. Our hypothesis is that the ability of C. albicans to invade and damage host cells, while avoiding host defense mechanisms, is critical for the organism to establish and maintain a deep- seated infection. Support for this hypothesis comes from our finding that many C. albicans mutants with reduced capacity to invade and damage endothelial cells in vitro also have decreased virulence in the mouse model of hematogenously disseminated infection. Our objective is to use in vitro studies of the interactions between C. albicans and vascular endothelial cells to define mechanisms of host- pathogen interaction. C. albicans invades endothelial cells by inducing its own endocytosis. In the previous project period, we discovered that C. albicans Als3 is an invasin that binds to N-cadherin on the endothelial cell surface and induces the endocytosis of the organism. Recently, we have determined that there are additional C. albicans invasins and endothelial cell surface proteins that mediate endocytosis. These surface proteins include AHNAK and ErbB2. In this project, we will 1) determine the interactions among AHNAK, N-cadherin, and ErbB2 in endothelial cell invasion by C. albicans;2) determine the mechanisms by which C. albicans Ssa1 contributes to endothelial cell invasion and virulence;3) use C. albicans mutants to elucidate functional relationships among C. albicans virulence regulators, endothelial cell receptors, and endothelial cell damage.
Project Relevance / Narrative This research is highly relevant to public health because hematogenously disseminated candidiasis is common in hospitalized patients and still causes significant mortality, even with currently available treatment. Discovering C. albicans genes and host cell receptors that govern endothelial cell invasion and damage holds promise to provide new insight into the pathogenesis of disseminated candidiasis. Furthermore, this information may be used to develop new diagnostic or therapeutic strategies against this frequently fatal disease.
|Park, Hyunsook; Solis, Norma V; Louie, James S et al. (2014) Different tumor necrosis factor ? antagonists have different effects on host susceptibility to disseminated and oropharyngeal candidiasis in mice. Virulence 5:625-9|
|Liu, Yaoping; Solis, Norma V; Heilmann, Clemens J et al. (2014) Role of retrograde trafficking in stress response, host cell interactions, and virulence of Candida albicans. Eukaryot Cell 13:279-87|
|Gebremariam, Teclegiorgis; Liu, Mingfu; Luo, Guanpingsheng et al. (2014) CotH3 mediates fungal invasion of host cells during mucormycosis. J Clin Invest 124:237-50|
|Miranda, Isabel; Silva-Dias, Ana; Rocha, Rita et al. (2013) Candida albicans CUG mistranslation is a mechanism to create cell surface variation. MBio 4:|
|Ariyachet, Chaiyaboot; Solis, Norma V; Liu, Yaoping et al. (2013) SR-like RNA-binding protein Slr1 affects Candida albicans filamentation and virulence. Infect Immun 81:1267-76|
|Jung, Sook-In; Finkel, Jonathan S; Solis, Norma V et al. (2013) Bcr1 functions downstream of Ssd1 to mediate antimicrobial peptide resistance in Candida albicans. Eukaryot Cell 12:411-9|
|Fu, Yue; Phan, Quynh T; Luo, Guanpingsheng et al. (2013) Investigation of the function of Candida albicans Als3 by heterologous expression in Candida glabrata. Infect Immun 81:2528-35|
|Filler, Scott G (2013) Can host receptors for fungi be targeted for treatment of fungal infections? Trends Microbiol 21:389-96|
|Lu, Yang; Su, Chang; Solis, Norma V et al. (2013) Synergistic regulation of hyphal elongation by hypoxia, CO(2), and nutrient conditions controls the virulence of Candida albicans. Cell Host Microbe 14:499-509|
|Ibrahim, Ashraf S; Luo, Guanpingsheng; Gebremariam, Teclegiorgis et al. (2013) NDV-3 protects mice from vulvovaginal candidiasis through T- and B-cell immune response. Vaccine 31:5549-56|
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