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Noble SM, Gianetti BA, Witchley JN. Candida albicans cell-type switching and functional plasticity in the mammalian host. Nat Rev Microbiol 2016; 15:96-108. [PMID: 27867199 DOI: 10.1038/nrmicro.2016.157] [Citation(s) in RCA: 323] [Impact Index Per Article: 40.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Candida albicans is a ubiquitous commensal of the mammalian microbiome and the most prevalent fungal pathogen of humans. A cell-type transition between yeast and hyphal morphologies in C. albicans was thought to underlie much of the variation in virulence observed in different host tissues. However, novel yeast-like cell morphotypes, including opaque(a/α), grey and gastrointestinally induced transition (GUT) cell types, were recently reported that exhibit marked differences in vitro and in animal models of commensalism and disease. In this Review, we explore the characteristics of the classic cell types - yeast, hyphae, pseudohyphae and chlamydospores - as well as the newly identified yeast-like morphotypes. We highlight emerging knowledge about the associations of these different morphotypes with different host niches and virulence potential, as well as the environmental cues and signalling pathways that are involved in the morphological transitions.
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Affiliation(s)
- Suzanne M Noble
- Department of Microbiology and Immunology, University of California San Francisco (UCSF) School of Medicine.,Infectious Diseases Division, Department of Medicine, University of California San Francisco (UCSF) School of Medicine, San Francisco, California 94143, USA
| | - Brittany A Gianetti
- Department of Microbiology and Immunology, University of California San Francisco (UCSF) School of Medicine
| | - Jessica N Witchley
- Department of Microbiology and Immunology, University of California San Francisco (UCSF) School of Medicine
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252
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Danhof HA, Vylkova S, Vesely EM, Ford AE, Gonzalez-Garay M, Lorenz MC. Robust Extracellular pH Modulation by Candida albicans during Growth in Carboxylic Acids. mBio 2016; 7:e01646-16. [PMID: 27935835 PMCID: PMC5111404 DOI: 10.1128/mbio.01646-16] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 10/24/2016] [Indexed: 12/25/2022] Open
Abstract
The opportunistic fungal pathogen Candida albicans thrives within diverse niches in the mammalian host. Among the adaptations that underlie this fitness is an ability to utilize a wide array of nutrients, especially sources of carbon that are disfavored by many other fungi; this contributes to its ability to survive interactions with the phagocytes that serve as key barriers against disseminated infections. We have reported that C. albicans generates ammonia as a byproduct of amino acid catabolism to neutralize the acidic phagolysosome and promote hyphal morphogenesis in a manner dependent on the Stp2 transcription factor. Here, we report that this species rapidly neutralizes acidic environments when utilizing carboxylic acids like pyruvate, α-ketoglutarate (αKG), or lactate as the primary carbon source. Unlike in cells growing in amino acid-rich medium, this does not result in ammonia release, does not induce hyphal differentiation, and is genetically distinct. While transcript profiling revealed significant similarities in gene expression in cells grown on either carboxylic or amino acids, genetic screens for mutants that fail to neutralize αKG medium identified a nonoverlapping set of genes, including CWT1, encoding a transcription factor responsive to cell wall and nitrosative stresses. Strains lacking CWT1 exhibit retarded αKG-mediated neutralization in vitro, exist in a more acidic phagolysosome, and are more susceptible to macrophage killing, while double cwt1Δ stp2Δ mutants are more impaired than either single mutant. Together, our observations indicate that C. albicans has evolved multiple ways to modulate the pH of host-relevant environments to promote its fitness as a pathogen. IMPORTANCE The fungal pathogen Candida albicans is a ubiquitous and usually benign constituent of the human microbial ecosystem. In individuals with weakened immune systems, this organism can cause potentially life-threatening infections and is one of the most common causes of hospital-acquired infections. Understanding the interactions between C. albicans and immune phagocytic cells, such as macrophages and neutrophils, will define the mechanisms of pathogenesis in this species. One such adaptation is an ability to make use of nonstandard nutrients that we predict are plentiful in certain niches within the host, including within these phagocytic cells. We show here that the metabolism of certain organic acids enables C. albicans to neutralize acidic environments, such as those within macrophages. This phenomenon is distinct in several significant ways from previous reports of similar processes, indicating that C. albicans has evolved multiple mechanisms to combat the harmful acidity of phagocytic cells.
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Affiliation(s)
- Heather A Danhof
- Department of Microbiology and Molecular Genetics, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, Texas, USA
- The Graduate School of Biomedical Sciences, University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Slavena Vylkova
- Department of Microbiology and Molecular Genetics, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Elisa M Vesely
- Department of Microbiology and Molecular Genetics, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, Texas, USA
- The Graduate School of Biomedical Sciences, University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Amy E Ford
- Department of Microbiology and Molecular Genetics, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, Texas, USA
- The Graduate School of Biomedical Sciences, University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Manuel Gonzalez-Garay
- The Brown Foundation Institute for Molecular Medicine, University of Texas Health Science Center at Houston, Houston, Texas, USA
| | - Michael C Lorenz
- Department of Microbiology and Molecular Genetics, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, Texas, USA
- The Graduate School of Biomedical Sciences, University of Texas Health Science Center at Houston, Houston, Texas, USA
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253
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Chairatana P, Nolan EM. Defensins, lectins, mucins, and secretory immunoglobulin A: microbe-binding biomolecules that contribute to mucosal immunity in the human gut. Crit Rev Biochem Mol Biol 2016. [PMID: 27841019 DOI: 10,1080/10409238.2016.124365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In the intestine, the mucosal immune system plays essential roles in maintaining homeostasis between the host and microorganisms, and protecting the host from pathogenic invaders. Epithelial cells produce and release a variety of biomolecules into the mucosa and lumen that contribute to immunity. In this review, we focus on a subset of these remarkable host-defense factors - enteric α-defensins, select lectins, mucins, and secretory immunoglobulin A - that have the capacity to bind microbes and thereby contribute to barrier function in the human gut. We provide an overview of the intestinal epithelium, describe specialized secretory cells named Paneth cells, and summarize our current understanding of the biophysical and functional properties of these select microbe-binding biomolecules. We intend for this compilation to complement prior reviews on intestinal host-defense factors, highlight recent advances in the field, and motivate investigations that further illuminate molecular mechanisms as well as the interplay between these molecules and microbes.
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Affiliation(s)
- Phoom Chairatana
- a Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA , USA
| | - Elizabeth M Nolan
- a Department of Chemistry , Massachusetts Institute of Technology , Cambridge , MA , USA
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255
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Weidt S, Haggarty J, Kean R, Cojocariu CI, Silcock PJ, Rajendran R, Ramage G, Burgess KEV. A novel targeted/untargeted GC-Orbitrap metabolomics methodology applied to Candida albicans and Staphylococcus aureus biofilms. Metabolomics 2016; 12:189. [PMID: 28003796 PMCID: PMC5097782 DOI: 10.1007/s11306-016-1134-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 10/18/2016] [Indexed: 10/26/2022]
Abstract
INTRODUCTION Combined infections from Candida albicans and Staphylococcus aureus are a leading cause of death in the developed world. Evidence suggests that Candida enhances the virulence of Staphylococcus-hyphae penetrate through tissue barriers, while S. aureus tightly associates with the hyphae to obtain entry to the host organism. Indeed, in a biofilm state, C. albicans enhances the antimicrobial resistance characteristics of S. aureus. The association of these microorganisms is also associated with significantly increased morbidity and mortality. Due to this tight association we hypothesised that metabolic effects were also in evidence. OBJECTIVES To explore the interaction, we used a novel GC-Orbitrap-based mass spectrometer, the Q Exactive GC, which combines the high peak capacity and chromatographic resolution of gas chromatography with the sub-ppm mass accuracy of an Orbitrap system. This allows the capability to leverage the widely available electron ionisation libraries for untargeted applications, along with expanding accurate mass libraries and targeted matches based around authentic standards. METHODS Optimised C. albicans and S. aureus mono- and co-cultured biofilms were analysed using the new instrument in addition to the fresh and spent bacterial growth media. RESULTS The targeted analysis experiment was based around 36 sugars and sugar phosphates, 22 amino acids and five organic acids. Untargeted analysis resulted in the detection of 465 features from fresh and spent medium and 405 from biofilm samples. Three significantly changing compounds that matched to high scoring library fragment patterns were chosen for validation. CONCLUSION Evaluation of the results demonstrates that the Q Exactive GC is suitable for metabolomics analysis using a targeted/untargeted methodology. Many of the results were as expected: e.g. rapid consumption of glucose and fructose from the medium regardless of the cell type. Modulation of sugar-phosphate levels also suggest that the pentose phosphate pathway could be enhanced in the cells from co-cultured biofilms. Untargeted metabolomics results suggested significant production of cell-wall biosynthesis components and the consumption of non-proteinaceous amino-acids.
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Affiliation(s)
- Stefan Weidt
- Polyomics, University of Glasgow, 211 Wolfson Wohl Translational Cancer Research Centre, Garscube Campus, Glasgow, G61 1QH UK
| | - Jennifer Haggarty
- Polyomics, University of Glasgow, 211 Wolfson Wohl Translational Cancer Research Centre, Garscube Campus, Glasgow, G61 1QH UK
| | - Ryan Kean
- Oral Sciences Research Group, Glasgow Dental School, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | | | | | - Ranjith Rajendran
- Oral Sciences Research Group, Glasgow Dental School, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Gordon Ramage
- Oral Sciences Research Group, Glasgow Dental School, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Karl E. V. Burgess
- Polyomics, University of Glasgow, 211 Wolfson Wohl Translational Cancer Research Centre, Garscube Campus, Glasgow, G61 1QH UK
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256
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Hebecker B, Vlaic S, Conrad T, Bauer M, Brunke S, Kapitan M, Linde J, Hube B, Jacobsen ID. Dual-species transcriptional profiling during systemic candidiasis reveals organ-specific host-pathogen interactions. Sci Rep 2016; 6:36055. [PMID: 27808111 PMCID: PMC5093689 DOI: 10.1038/srep36055] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 10/11/2016] [Indexed: 11/15/2022] Open
Abstract
Candida albicans is a common cause of life-threatening fungal bloodstream infections. In the murine model of systemic candidiasis, the kidney is the primary target organ while the fungal load declines over time in liver and spleen. To better understand these organ-specific differences in host-pathogen interaction, we performed gene expression profiling of murine kidney, liver and spleen and determined the fungal transcriptome in liver and kidney. We observed a delayed transcriptional immune response accompanied by late induction of fungal stress response genes in the kidneys. In contrast, early upregulation of the proinflammatory response in the liver was associated with a fungal transcriptome resembling response to phagocytosis, suggesting that phagocytes contribute significantly to fungal control in the liver. Notably, C. albicans hypha-associated genes were upregulated in the absence of visible filamentation in the liver, indicating an uncoupling of gene expression and morphology and a morphology-independent effect by hypha-associated genes in this organ. Consistently, integration of host and pathogen transcriptional data in an inter-species gene regulatory network indicated connections of C. albicans cell wall remodelling and metabolism to the organ-specific immune responses.
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Affiliation(s)
- Betty Hebecker
- Research Group Microbial Immunology, Leibniz Institute for Natural Product Research and Infection Biology (Hans Knöll Institute), Jena, Germany.,Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany
| | - Sebastian Vlaic
- Department of General, Visceral and Vascular Surgery, Experimental Transplantation Surgery, Jena University Hospital, Jena, Germany.,Research Group Systems Biology/Bioinformatics, Leibniz Institute for Natural Product Research and Infection Biology (Hans Knöll Institute), Jena, Germany.,Department of Bioinformatics, Friedrich-Schiller-University Jena, Germany
| | - Theresia Conrad
- Research Group Systems Biology/Bioinformatics, Leibniz Institute for Natural Product Research and Infection Biology (Hans Knöll Institute), Jena, Germany
| | - Michael Bauer
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Department of Anaesthesiology and Intensive Care Therapy, Jena University Hospital, Jena, Germany
| | - Sascha Brunke
- Department of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural Product Research and Infection Biology (Hans Knöll Institute), Jena, Germany
| | - Mario Kapitan
- Research Group Microbial Immunology, Leibniz Institute for Natural Product Research and Infection Biology (Hans Knöll Institute), Jena, Germany
| | - Jörg Linde
- Research Group Systems Biology/Bioinformatics, Leibniz Institute for Natural Product Research and Infection Biology (Hans Knöll Institute), Jena, Germany
| | - Bernhard Hube
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Department of Microbial Pathogenicity Mechanisms, Leibniz Institute for Natural Product Research and Infection Biology (Hans Knöll Institute), Jena, Germany.,Friedrich-Schiller-University, Jena, Germany
| | - Ilse D Jacobsen
- Research Group Microbial Immunology, Leibniz Institute for Natural Product Research and Infection Biology (Hans Knöll Institute), Jena, Germany.,Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Friedrich-Schiller-University, Jena, Germany
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257
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Pais P, Costa C, Cavalheiro M, Romão D, Teixeira MC. Transcriptional Control of Drug Resistance, Virulence and Immune System Evasion in Pathogenic Fungi: A Cross-Species Comparison. Front Cell Infect Microbiol 2016; 6:131. [PMID: 27812511 PMCID: PMC5072224 DOI: 10.3389/fcimb.2016.00131] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 09/29/2016] [Indexed: 12/26/2022] Open
Abstract
Transcription factors are key players in the control of the activation or repression of gene expression programs in response to environmental stimuli. The study of regulatory networks taking place in fungal pathogens is a promising research topic that can help in the fight against these pathogens by targeting specific fungal pathways as a whole, instead of targeting more specific effectors of virulence or drug resistance. This review is focused on the analysis of regulatory networks playing a central role in the referred mechanisms in the human fungal pathogens Aspergillus fumigatus, Cryptococcus neoformans, Candida albicans, Candida glabrata, Candida parapsilosis, and Candida tropicalis. Current knowledge on the activity of the transcription factors characterized in each of these pathogenic fungal species will be addressed. Particular focus is given to their mechanisms of activation, regulatory targets and phenotypic outcome. The review further provides an evaluation on the conservation of transcriptional circuits among different fungal pathogens, highlighting the pathways that translate common or divergent traits among these species in what concerns their drug resistance, virulence and host immune evasion features. It becomes evident that the regulation of transcriptional networks is complex and presents significant variations among different fungal pathogens. Only the oxidative stress regulators Yap1 and Skn7 are conserved among all studied species; while some transcription factors, involved in nutrient homeostasis, pH adaptation, drug resistance and morphological switching are present in several, though not all species. Interestingly, in some cases not very homologous transcription factors display orthologous functions, whereas some homologous proteins have diverged in terms of their function in different species. A few cases of species specific transcription factors are also observed.
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Affiliation(s)
- Pedro Pais
- Biological Sciences Research Group, Department of Bioengineering, Instituto Superior Técnico, Universidade de LisboaLisbon, Portugal; Biological Sciences Research Group, Institute for Bioengineering and Biosciences, Instituto Superior TécnicoLisboa, Portugal
| | - Catarina Costa
- Biological Sciences Research Group, Department of Bioengineering, Instituto Superior Técnico, Universidade de LisboaLisbon, Portugal; Biological Sciences Research Group, Institute for Bioengineering and Biosciences, Instituto Superior TécnicoLisboa, Portugal
| | - Mafalda Cavalheiro
- Biological Sciences Research Group, Department of Bioengineering, Instituto Superior Técnico, Universidade de LisboaLisbon, Portugal; Biological Sciences Research Group, Institute for Bioengineering and Biosciences, Instituto Superior TécnicoLisboa, Portugal
| | - Daniela Romão
- Biological Sciences Research Group, Department of Bioengineering, Instituto Superior Técnico, Universidade de LisboaLisbon, Portugal; Biological Sciences Research Group, Institute for Bioengineering and Biosciences, Instituto Superior TécnicoLisboa, Portugal
| | - Miguel C Teixeira
- Biological Sciences Research Group, Department of Bioengineering, Instituto Superior Técnico, Universidade de LisboaLisbon, Portugal; Biological Sciences Research Group, Institute for Bioengineering and Biosciences, Instituto Superior TécnicoLisboa, Portugal
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258
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A Novel Hybrid Iron Regulation Network Combines Features from Pathogenic and Nonpathogenic Yeasts. mBio 2016; 7:mBio.01782-16. [PMID: 27795405 PMCID: PMC5082906 DOI: 10.1128/mbio.01782-16] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Iron is an essential micronutrient for both pathogens and their hosts, which restrict iron availability during infections in an effort to prevent microbial growth. Successful human pathogens like the yeast Candida glabrata have thus developed effective iron acquisition strategies. Their regulation has been investigated well for some pathogenic fungi and in the model organism Saccharomyces cerevisiae, which employs an evolutionarily derived system. Here, we show that C. glabrata uses a regulation network largely consisting of components of the S. cerevisiae regulon but also of elements of other pathogenic fungi. Specifically, similarly to baker's yeast, Aft1 is the main positive regulator under iron starvation conditions, while Cth2 degrades mRNAs encoding iron-requiring enzymes. However, unlike the case with S. cerevisiae, a Sef1 ortholog is required for full growth under iron limitation conditions, making C. glabrata an evolutionary intermediate to SEF1-dependent fungal pathogens. Therefore, C. glabrata has evolved an iron homeostasis system which seems to be unique within the pathogenic fungi. IMPORTANCE The fungus Candida glabrata represents an evolutionarily close relative of the well-studied and benign baker's yeast and model organism Saccharomyces cerevisiae On the other hand, C. glabrata is an important opportunistic human pathogen causing both superficial and systemic infections. The ability to acquire trace metals, in particular, iron, and to tightly regulate this process during infection is considered an important virulence attribute of a variety of pathogens. Importantly, S. cerevisiae uses a highly derivative regulatory system distinct from those of other fungi. Until now, the regulatory mechanism of iron homeostasis in C. glabrata has been mostly unknown. Our study revealed a hybrid iron regulation network that is unique to C. glabrata and is placed at an evolutionary midpoint between those of S. cerevisiae and related fungal pathogens. We thereby show that, in the host, even a successful human pathogen can rely largely on a strategy normally found in nonpathogenic fungi from a terrestrial environment.
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259
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Epidemiología, factores de riesgo y sensibilidad in vitro en candidemias por especies diferentes de Candida albicans. Rev Iberoam Micol 2016; 33:248-252. [DOI: 10.1016/j.riam.2016.04.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 03/30/2016] [Accepted: 04/06/2016] [Indexed: 11/22/2022] Open
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Exploiting Interkingdom Interactions for Development of Small-Molecule Inhibitors of Candida albicans Biofilm Formation. Antimicrob Agents Chemother 2016; 60:5894-905. [PMID: 27458231 DOI: 10.1128/aac.00190-16] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 07/01/2016] [Indexed: 12/22/2022] Open
Abstract
A rapid decline in the development of new antimicrobial therapeutics has coincided with the emergence of new and more aggressive multidrug-resistant pathogens. Pathogens are protected from antibiotic activity by their ability to enter an aggregative biofilm state. Therefore, disrupting this process in pathogens is a key strategy for the development of next-generation antimicrobials. Here, we present a suite of compounds, based on the Pseudomonas aeruginosa 2-heptyl-4(1H)-quinolone (HHQ) core quinolone interkingdom signal structure, that exhibit noncytotoxic antibiofilm activity toward the fungal pathogen Candida albicans In addition to providing new insights into what is a clinically important bacterium-fungus interaction, the capacity to modularize the functionality of the quinolone signals is an important advance in harnessing the therapeutic potential of signaling molecules in general. This provides a platform for the development of potent next-generation small-molecule therapeutics targeting clinically relevant fungal pathogens.
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261
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Candida albicans Pathogenesis: Fitting within the Host-Microbe Damage Response Framework. Infect Immun 2016; 84:2724-39. [PMID: 27430274 DOI: 10.1128/iai.00469-16] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Historically, the nature and extent of host damage by a microbe were considered highly dependent on virulence attributes of the microbe. However, it has become clear that disease is a complex outcome which can arise because of pathogen-mediated damage, host-mediated damage, or both, with active participation from the host microbiota. This awareness led to the formulation of the damage response framework (DRF), a revolutionary concept that defined microbial virulence as a function of host immunity. The DRF outlines six classifications of host damage outcomes based on the microbe and the strength of the immune response. In this review, we revisit this concept from the perspective of Candida albicans, a microbial pathogen uniquely adapted to its human host. This fungus commonly colonizes various anatomical sites without causing notable damage. However, depending on environmental conditions, a diverse array of diseases may occur, ranging from mucosal to invasive systemic infections resulting in microbe-mediated and/or host-mediated damage. Remarkably, C. albicans infections can fit into all six DRF classifications, depending on the anatomical site and associated host immune response. Here, we highlight some of these diverse and site-specific diseases and how they fit the DRF classifications, and we describe the animal models available to uncover pathogenic mechanisms and related host immune responses.
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262
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Voltan AR, Quindós G, Alarcón KPM, Fusco-Almeida AM, Mendes-Giannini MJS, Chorilli M. Fungal diseases: could nanostructured drug delivery systems be a novel paradigm for therapy? Int J Nanomedicine 2016; 11:3715-30. [PMID: 27540288 PMCID: PMC4982498 DOI: 10.2147/ijn.s93105] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Invasive mycoses are a major problem for immunocompromised individuals and patients in intensive care units. Morbidity and mortality rates of these infections are high because of late diagnosis and delayed treatment. Moreover, the number of available antifungal agents is low, and there are problems with toxicity and resistance. Alternatives for treating invasive fungal infections are necessary. Nanostructured systems could be excellent carriers for antifungal drugs, reducing toxicity and targeting their action. The use of nanostructured systems for antifungal therapy began in the 1990s, with the appearance of lipid formulations of amphotericin B. This review encompasses different antifungal drug delivery systems, such as liposomes, carriers based on solid lipids and nanostructure lipids, polymeric nanoparticles, dendrimers, and others. All these delivery systems have advantages and disadvantages. Main advantages are the improvement in the antifungal properties, such as bioavailability, reduction in toxicity, and target tissue, which facilitates innovative therapeutic techniques. Conversely, a major disadvantage is the high cost of production. In the near future, the use of nanosystems for drug delivery strategies can be used for delivering peptides, including mucoadhesive systems for the treatment of oral and vaginal candidiasis.
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Affiliation(s)
- Aline Raquel Voltan
- Department of Drugs and Medicines, Faculty of Pharmaceutical Sciences, Univ. Estadual Paulista, Araraquara, Sao Paulo, Brazil
| | - Guillermo Quindós
- Immunology, Microbiology, and Parasitology Department, Facultad de Medicina y Odontología, Universidad del País Vasco, Bilbao, Spain
| | - Kaila P Medina Alarcón
- Department of Clinical Analysis, Faculdade de Ciências Farmacêuticas, Univ. Estadual Paulista, Araraquara, Sao Paulo, Brazil
| | - Ana Marisa Fusco-Almeida
- Department of Clinical Analysis, Faculdade de Ciências Farmacêuticas, Univ. Estadual Paulista, Araraquara, Sao Paulo, Brazil
| | | | - Marlus Chorilli
- Department of Drugs and Medicines, Faculty of Pharmaceutical Sciences, Univ. Estadual Paulista, Araraquara, Sao Paulo, Brazil
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263
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McCarthy MW, Walsh TJ. PCR methodology and applications for the detection of human fungal pathogens. Expert Rev Mol Diagn 2016; 16:1025-36. [PMID: 27484841 DOI: 10.1080/14737159.2016.1219253] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
INTRODUCTION Polymerase chain reaction (PCR) has emerged as a promising technology for the rapid and reliable detection and identification of medical mycoses. Recent technological advancements - including microarray, multiplex PCR with magnetic resonance, and beacon probes - have mitigated the technical difficulties of performing nucleic amplification in fungi, thereby improving the sensitivity and specificity of PCR-based assays. In this paper, we examine current applications of PCR in the diagnosis of human fungal infections and look ahead to emerging techniques that may play a larger role in molecular diagnostics in the future. AREAS COVERED This review includes a brief overview of the advantages and disadvantages of PCR using various clinical specimens, manual versus automated DNA extraction procedures, panfungal versus specific targets, and spectrum of pathogens detected. This is followed by a brief synopsis of species-specific PCR approaches and a more in-depth look at the obstacles to widespread implementation. Expert commentary: The review concludes with a short perspective for the next five years, including the hurdles to standardization and validation, as well as the role of PCR coupled with electrospray-ionization mass spectrometry (PCR/ESI-MS) or nuclear magnetic resonance for the diagnosis of medical mycoses.
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Affiliation(s)
- Matthew William McCarthy
- a Hospital Medicine , Joan and Sanford I Weill Medical College of Cornell University Ringgold Standard Institution , New York , NY , USA
| | - Thomas J Walsh
- b Transplantation-Oncology Infectious Diseases Program , Weill Cornell Medical Center , New York , NY , USA
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Al-Tarrah K, Abdelaty M, Behbahani A, Mokaddas E, Soliman H, Albader A. Cutaneous mucormycosis postcosmetic surgery: A case report and review of the literature. Medicine (Baltimore) 2016; 95:e4185. [PMID: 27399143 PMCID: PMC5058872 DOI: 10.1097/md.0000000000004185] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Mucormycosis is a rare, aggressive, and life-threatening infection that is caused by organisms belonging to the order Mucorales. It is usually acquired through direct means and virtually always affects immunocompromised patients with the port of entry reflecting the site of infection, in this case, cutaneous. Unlike other mucormycoses, patients affected by Apophysomyces elegans (A elegans) are known to be immunocompetent. This locally aggressive disease penetrates through different tissue plains invading adjacent muscles, fascia, and even bone causing extensive morbidity and may prove fatal if treated inadequately. Cutaneous mucormycosis is associated with disruption of cutaneous barriers such as trauma. However, rarely, it may be iatrogenic. No cases have been previously reported postcosmetic surgery, especially one that is so commonly performed, lipofilling. CASE REPORT The patient is a, previously healthy, 41-year-old middle-eastern female who was admitted to the plastic surgery department 17 days after undergoing cosmetic surgery. She suffered from extensive tissue inflammation and necrosis in both gluteal regions. Following admission, she was initially started on empirical antimicrobial therapy which was changed to an antifungal agent, voriconazole, when preliminary microbiological results showed filamentous fungi. This was discontinued and liposomal amphotericin B was commenced when further mycological analysis identified A elegans. Furthermore, she underwent a total of 10 sessions of extensive debridement to the extent that portions of the sacrum and left femoral head became exposed. Her clinical status and wounds improved with the appropriate management and she remained an inpatient for 62 days. Subsequently, she had defects in both gluteal regions which required reconstructive surgery. CONCLUSION A elegans is an uncommon cause of iatrogenic cutaneous mucormycosis. A high index of clinical suspicion is required, especially in the absence of clinical improvement despite conventional methods of treatment, so that early diagnosis can be reached and the appropriate management instigated promptly in order to mitigate morbidity and mortality. Reversal of predisposing risk factors, regular extensive surgical debridement, and antifungal therapy remain the cornerstones of therapy for this life-threatening condition.
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Affiliation(s)
- Khaled Al-Tarrah
- Department of Burns and Plastic Surgery
- Correspondence: Khaled Al-Tarrah, Burns and Plastic Surgery Department, Ibn Sina Specialist Hospital, Al-Sabah Health District, Kuwait (e-mail: )
| | | | | | - Eman Mokaddas
- Department of Microbiology, Ibn Sina Specialist Hospital
- Department of Microbiology, University of Kuwait, Kuwait
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Abstract
In humans, microbial cells (including bacteria, archaea, and fungi) greatly outnumber host cells. Candida albicans is the most prevalent fungal species of the human microbiota; this species asymptomatically colonizes many areas of the body, particularly the gastrointestinal and genitourinary tracts of healthy individuals. Alterations in host immunity, stress, resident microbiota, and other factors can lead to C. albicans overgrowth, causing a wide range of infections, from superficial mucosal to hematogenously disseminated candidiasis. To date, most studies of C. albicans have been carried out in suspension cultures; however, the medical impact of C. albicans (like that of many other microorganisms) depends on its ability to thrive as a biofilm, a closely packed community of cells. Biofilms are notorious for forming on implanted medical devices, including catheters, pacemakers, dentures, and prosthetic joints, which provide a surface and sanctuary for biofilm growth. C. albicans biofilms are intrinsically resistant to conventional antifungal therapeutics, the host immune system, and other environmental perturbations, making biofilm-based infections a significant clinical challenge. Here, we review our current knowledge of biofilms formed by C. albicans and closely related fungal species.
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Affiliation(s)
- Clarissa J Nobile
- Department of Molecular and Cell Biology, School of Natural Sciences, University of California, Merced, California 95343;
| | - Alexander D Johnson
- Department of Microbiology and Immunology, University of California, San Francisco, California 94143;
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Morphological and physiological changes induced by contact-dependent interaction between Candida albicans and Fusobacterium nucleatum. Sci Rep 2016; 6:27956. [PMID: 27295972 PMCID: PMC4906402 DOI: 10.1038/srep27956] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 05/27/2016] [Indexed: 02/08/2023] Open
Abstract
Candida albicans and Fusobacterium nucleatum are well-studied oral commensal microbes with pathogenic potential that are involved in various oral polymicrobial infectious diseases. Recently, we demonstrated that F. nucleatum ATCC 23726 coaggregates with C. albicans SN152, a process mainly mediated by fusobacterial membrane protein RadD and Candida cell wall protein Flo9. The aim of this study was to investigate the potential biological impact of this inter-kingdom interaction. We found that F. nucleatum ATCC 23726 inhibits growth and hyphal morphogenesis of C. albicans SN152 in a contact-dependent manner. Further analysis revealed that the inhibition of Candida hyphal morphogenesis is mediated via RadD and Flo9 protein pair. Using a murine macrophage cell line, we showed that the F. nucleatum-induced inhibition of Candida hyphal morphogenesis promotes C. albicans survival and negatively impacts the macrophage-killing capability of C. albicans. Furthermore, the yeast form of C. albicans repressed F. nucleatum-induced MCP-1 and TNFα production in macrophages. Our study suggests that the interaction between C. albicans and F. nucleatum leads to a mutual attenuation of virulence, which may function to promote a long-term commensal lifestyle within the oral cavity. This finding has significant implications for our understanding of inter-kingdom interaction and may impact clinical treatment strategies.
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267
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Sidiq F, Hoostal M, Rogers SO. Rapid identification of fungi in culture-negative clinical blood and respiratory samples by DNA sequence analyses. BMC Res Notes 2016; 9:293. [PMID: 27268007 PMCID: PMC4895986 DOI: 10.1186/s13104-016-2097-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 05/23/2016] [Indexed: 11/18/2022] Open
Abstract
Background Clinical diagnoses of fungal infections often rely upon culture techniques followed by microscopic examination of positive cultures and histopathological specimens. Culturing of microorganisms is prone to false negatives, while microscopy methods can be complicated by atypical phenotypes and organisms that are morphologically indistinguishable in tissues. Delays in diagnoses (or the lack thereof) and inaccurate identification of infectious organisms contribute to increased morbidity and mortality in patients. Methods Two-hundred randomized, heterogeneous patient blood and respiratory samples that were culture-negative were tested using polymerase chain reaction (PCR) amplification of internal transcribed spacer regions of ribosomal RNA genes utilizing panfungal primers. Amplicons were sequenced, subjected to sequence similarity searches, and compared using phylogenetic analyses. Results Thirteen fungal sequences were detected in three whole-blood samples and nine respiratory samples. Bioinformatic analyses were performed which indicated the presence of multiple pathogens and potential pathogens. Conclusions The results from this pilot study demonstrate the utility of PCR assays and sequence analyses in clinical tests for fungi to facilitate rapid diagnosis and appropriate treatments to deal with the false negatives from culture results.
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Affiliation(s)
- Farida Sidiq
- Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, 43403, USA
| | - Matt Hoostal
- Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, 43403, USA
| | - Scott O Rogers
- Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, 43403, USA.
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268
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Moazeni M, Kelidari HR, Saeedi M, Morteza-Semnani K, Nabili M, Gohar AA, Akbari J, Lotfali E, Nokhodchi A. Time to overcome fluconazole resistant Candida isolates: Solid lipid nanoparticles as a novel antifungal drug delivery system. Colloids Surf B Biointerfaces 2016; 142:400-407. [DOI: 10.1016/j.colsurfb.2016.03.013] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Revised: 03/01/2016] [Accepted: 03/03/2016] [Indexed: 12/25/2022]
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269
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Miramón P, Lorenz MC. The SPS amino acid sensor mediates nutrient acquisition and immune evasion in Candida albicans. Cell Microbiol 2016; 18:1611-1624. [PMID: 27060451 DOI: 10.1111/cmi.12600] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 02/12/2016] [Accepted: 03/30/2016] [Indexed: 01/20/2023]
Abstract
Candida albicans is well adapted to its host and is able to sense and respond to the nutrients available within. We have shown that C. albicans avidly utilizes amino acids as a carbon source, which allows this opportunistic pathogen to neutralize acidic environments, including the macrophage phagosome. The transcription factor Stp2 is a key regulator of this phenomenon, and we sought to understand the mechanism of activation of Stp2, focusing on the SPS sensor system previously characterized for its role in nitrogen acquisition. We generated deletion mutants of the three components, SSY1, PTR3 and SSY5 and demonstrated that these strains utilize amino acids poorly as carbon source, cannot neutralize the medium in response to these nutrients, and have reduced ammonia release. Exogenous amino acids rapidly induce proteolytic processing of Stp2 and nuclear translocation in an SPS-dependent manner. A truncated version of Stp2, lacking the amino terminal nuclear exclusion domain, could suppress the growth and pH neutralization defects of the SPS mutants. We showed that the SPS system is required for normal resistance of C. albicans to macrophages and that mutants defective in this system reside in more acidic phagosomes compared with wild type cells; however, a more equivocal contribution was observed in the murine model of disseminated candidiasis. Taken together, these results indicate that the SPS system is activated under carbon starvation conditions resembling host environments, regulating Stp2 functions necessary for amino acid catabolism and normal interactions with innate immune cells.
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Affiliation(s)
- Pedro Miramón
- Department of Microbiology and Molecular Genetics, The University of Texas Health Science Center, Houston, TX 77030, USA
| | - Michael C Lorenz
- Department of Microbiology and Molecular Genetics, The University of Texas Health Science Center, Houston, TX 77030, USA.
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270
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Pilmis B, Puel A, Lortholary O, Lanternier F. New clinical phenotypes of fungal infections in special hosts. Clin Microbiol Infect 2016; 22:681-7. [PMID: 27237547 DOI: 10.1016/j.cmi.2016.05.016] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2016] [Revised: 05/11/2016] [Accepted: 05/14/2016] [Indexed: 02/06/2023]
Abstract
Incidence of invasive fungal infections increases over time with the rise in at-risk populations; in particular, patients with acquired immunodeficiencies due to immunosuppressive therapies such as anti-tumour necrosis factor-α (TNF-α) treatment, cirrhosis or burns. Some primary immunodeficiencies (PID) can also predispose selectively to invasive fungal diseases. Conversely, some atypical fungal diseases can reveal new PID. Deep dermatophytosis, Candida central nervous system infections or gastrointestinal disease, or disseminated phaeohyphomycosis-revealed CARD9 deficiency. Most patients with inherited chronic mucocutaneous candidiasis were found to carry STAT1 gain-of-function mutations. The spectrum of fungal susceptibility and clinical presentation varies according to the PID. Among acquired immunodeficiencies, immunosuppressive treatments such as TNF-α blocker therapy, which has revolutionized autoimmune disorder treatment, may be complicated by endemic mycosis, aspergillosis, pneumocystosis or cryptococcosis. Burn patients with damaged skin barrier protection are susceptible to severe Candida infections and filamentous fungal infections (such as Aspergillus spp., Mucorales). Moreover, patients with cirrhosis are at increased risk of fungal infections. Therefore, physicians should think of any potential underlying acquired or inherited immunodeficiency in a patient developing an atypical fungal infection, or of a potential fungal disease in the context of an atypical presentation in specific hosts.
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Affiliation(s)
- B Pilmis
- Paris Descartes University, Sorbonne Paris Cité, Infectious Diseases Unit, Necker-Enfants Malades University Hospital, AP-HP, Imagine Institute, Paris, France; Antimicrobial Stewardship Team, Microbiology Unit, Groupe Hospitalier Paris Saint Joseph, Paris, France
| | - A Puel
- Paris Descartes University, Sorbonne Paris Cité, Infectious Diseases Unit, Necker-Enfants Malades University Hospital, AP-HP, Imagine Institute, Paris, France; Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR1163, Paris, France; Imagine Institute, Paris Descartes University, Sorbonne Paris Cité, Paris, France
| | - O Lortholary
- Paris Descartes University, Sorbonne Paris Cité, Infectious Diseases Unit, Necker-Enfants Malades University Hospital, AP-HP, Imagine Institute, Paris, France; Institut Pasteur, Unite de Mycologie Moleculaire, CNRS URA3012, Paris, France; Institut Pasteur, Centre National de Référence Mycoses invasives et Antifongiques, Paris, France
| | - F Lanternier
- Paris Descartes University, Sorbonne Paris Cité, Infectious Diseases Unit, Necker-Enfants Malades University Hospital, AP-HP, Imagine Institute, Paris, France; Institut Pasteur, Unite de Mycologie Moleculaire, CNRS URA3012, Paris, France; Institut Pasteur, Centre National de Référence Mycoses invasives et Antifongiques, Paris, France
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271
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Kashem SW, Kaplan DH. Skin Immunity to Candida albicans. Trends Immunol 2016; 37:440-450. [PMID: 27178391 DOI: 10.1016/j.it.2016.04.007] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 04/20/2016] [Accepted: 04/21/2016] [Indexed: 12/20/2022]
Abstract
Candida albicans is a dimorphic commensal fungus that colonizes healthy human skin, mucosa, and the reproductive tract. C. albicans is also a predominantly opportunistic fungal pathogen, leading to disease manifestations such as disseminated candidiasis and chronic mucocutaneous candidiasis (CMC). The differing host susceptibilities for the sites of C. albicans infection have revealed tissue compartmentalization with tailoring of immune responses based on the site of infection. Furthermore, extensive studies of host genetics in rare cases of CMC have identified conserved genetic pathways involved in immune recognition and the response to the extracellular pathogen. We focus here on human and mouse skin as a site of C. albicans infection, and we review established and newly discovered insights into the cellular pathways that promote cutaneous antifungal immunity.
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Affiliation(s)
- Sakeen W Kashem
- Department of Dermatology, Center for Immunology, University of Minnesota, Minneapolis, MN 55455, USA
| | - Daniel H Kaplan
- Departments of Dermatology and Immunology, University of Pittsburgh, Pittsburgh, PA 15216, USA.
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272
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Merhej J, Thiebaut A, Blugeon C, Pouch J, Ali Chaouche MEA, Camadro JM, Le Crom S, Lelandais G, Devaux F. A Network of Paralogous Stress Response Transcription Factors in the Human Pathogen Candida glabrata. Front Microbiol 2016; 7:645. [PMID: 27242683 PMCID: PMC4860858 DOI: 10.3389/fmicb.2016.00645] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Accepted: 04/18/2016] [Indexed: 01/15/2023] Open
Abstract
The yeast Candida glabrata has become the second cause of systemic candidemia in humans. However, relatively few genome-wide studies have been conducted in this organism and our knowledge of its transcriptional regulatory network is quite limited. In the present work, we combined genome-wide chromatin immunoprecipitation (ChIP-seq), transcriptome analyses, and DNA binding motif predictions to describe the regulatory interactions of the seven Yap (Yeast AP1) transcription factors of C. glabrata. We described a transcriptional network containing 255 regulatory interactions and 309 potential target genes. We predicted with high confidence the preferred DNA binding sites for 5 of the 7 CgYaps and showed a strong conservation of the Yap DNA binding properties between S. cerevisiae and C. glabrata. We provided reliable functional annotation for 3 of the 7 Yaps and identified for Yap1 and Yap5 a core regulon which is conserved in S. cerevisiae, C. glabrata, and C. albicans. We uncovered new roles for CgYap7 in the regulation of iron-sulfur cluster biogenesis, for CgYap1 in the regulation of heme biosynthesis and for CgYap5 in the repression of GRX4 in response to iron starvation. These transcription factors define an interconnected transcriptional network at the cross-roads between redox homeostasis, oxygen consumption, and iron metabolism.
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Affiliation(s)
- Jawad Merhej
- Laboratoire de Biologie Computationnelle et Quantitative, Centre National de la Recherche Scientifique, Institut de Biologie Paris-Seine, UMR 7238, Sorbonne Universités, Université Pierre et Marie Curie Paris, France
| | - Antonin Thiebaut
- Laboratoire de Biologie Computationnelle et Quantitative, Centre National de la Recherche Scientifique, Institut de Biologie Paris-Seine, UMR 7238, Sorbonne Universités, Université Pierre et Marie Curie Paris, France
| | - Corinne Blugeon
- École Normale Supérieure, Paris Sciences et Lettres Research University, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale, Institut de Biologie de l'École Normale Supérieure, Plateforme Génomique Paris, France
| | - Juliette Pouch
- École Normale Supérieure, Paris Sciences et Lettres Research University, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale, Institut de Biologie de l'École Normale Supérieure, Plateforme Génomique Paris, France
| | - Mohammed El Amine Ali Chaouche
- École Normale Supérieure, Paris Sciences et Lettres Research University, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale, Institut de Biologie de l'École Normale Supérieure, Plateforme Génomique Paris, France
| | - Jean-Michel Camadro
- Centre National de la Recherche Scientifique, UMR 7592, Institut Jacques Monod, Université Paris Diderot, Sorbonne Paris Cité Paris, France
| | - Stéphane Le Crom
- Évolution, Centre National de la Recherche Scientifique, Institut de Biologie Paris-Seine, UMR 7138, Sorbonne Universités, Université Pierre et Marie Curie Paris, France
| | - Gaëlle Lelandais
- Centre National de la Recherche Scientifique, UMR 7592, Institut Jacques Monod, Université Paris Diderot, Sorbonne Paris Cité Paris, France
| | - Frédéric Devaux
- Laboratoire de Biologie Computationnelle et Quantitative, Centre National de la Recherche Scientifique, Institut de Biologie Paris-Seine, UMR 7238, Sorbonne Universités, Université Pierre et Marie Curie Paris, France
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273
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Nabili M, Abdollahi Gohar A, Badali H, Mohammadi R, Moazeni M. Amino acid substitutions in Erg11p of azole-resistant Candida glabrata: Possible effective substitutions and homology modelling. J Glob Antimicrob Resist 2016; 5:42-6. [PMID: 27436465 DOI: 10.1016/j.jgar.2016.03.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 03/14/2016] [Accepted: 03/18/2016] [Indexed: 11/19/2022] Open
Abstract
Understanding the mechanisms responsible for fluconazole resistance in Candida glabrata is not only crucial for the development of new antifungals but is also important in choosing appropriate antifungals for patients at the earliest stages. The aim of this study was to determine the Erg11p amino acid substitutions in fluconazole-resistant C. glabrata isolates. Sixty clinical isolates of C. glabrata were investigated. In vitro antifungal activities of fluconazole, itraconazole and voriconazole were determined using the broth microdilution reference method. The ERG11 gene for resistant (n=4) and susceptible (n=1) isolates were sequenced and multi-aligned using MEGA6 software. A homology model of the C. glabrata ERG11 gene was created by SWISS-MODEL software using the crystal structure of Saccharomyces cerevisiae Erg11p as a template, and the predicted binding sites to fluconazole were investigated. Fluconazole and multi-azole resistance were observed in 6.7% and 3.3% of the isolates, respectively. Several amino acid substitutions were identified, among which some were also identified in susceptible isolates. The amino acid substitution G236V was at the binding site, and substitutions H146Q and D234E were near to the binding site of triazoles according to the SWISS-MODEL. According to the homology modelling results, the amino acid substitution G236V is highly likely to play a key role in azole resistance development.
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Affiliation(s)
- Mojtaba Nabili
- Student Research Committee, Mazandaran University of Medical Sciences, Sari, Iran
| | - Atefeh Abdollahi Gohar
- Invasive Fungi Research Centre/Department of Medical Mycology and Parasitology, School of Medicine, Mazandaran University of Medical Sciences, 20th km of Khazar Abad Road, P.O. Box 4847191971, Sari, Iran
| | - Hamid Badali
- Invasive Fungi Research Centre/Department of Medical Mycology and Parasitology, School of Medicine, Mazandaran University of Medical Sciences, 20th km of Khazar Abad Road, P.O. Box 4847191971, Sari, Iran
| | - Rasoul Mohammadi
- Department of Medical Parasitology and Mycology, School of Medicine and Infectious Diseases/Tropical Medicine Research Centre, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Maryam Moazeni
- Invasive Fungi Research Centre/Department of Medical Mycology and Parasitology, School of Medicine, Mazandaran University of Medical Sciences, 20th km of Khazar Abad Road, P.O. Box 4847191971, Sari, Iran.
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274
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Govender NP, Patel J, Magobo RE, Naicker S, Wadula J, Whitelaw A, Coovadia Y, Kularatne R, Govind C, Lockhart SR, Zietsman IL. Emergence of azole-resistant Candida parapsilosis causing bloodstream infection: results from laboratory-based sentinel surveillance in South Africa. J Antimicrob Chemother 2016; 71:1994-2004. [PMID: 27125552 DOI: 10.1093/jac/dkw091] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 02/29/2016] [Indexed: 12/22/2022] Open
Abstract
OBJECTIVES To compare Candida species distribution and antifungal susceptibility at South African public- and private-sector hospitals. METHODS From February 2009 through to August 2010, laboratory-based surveillance for candidaemia was undertaken at 11 public-sector hospitals and >85 private-sector hospitals across South Africa. A case was defined as a patient of any age admitted to a sentinel hospital with isolation of Candida species from blood culture. Viable isolates were identified and tested for antifungal susceptibility at a reference laboratory. Demographic and limited clinical data were abstracted from laboratory records. RESULTS In total, 2172 cases of candidaemia were detected. Among patients with available data, almost two-thirds were critically ill (719/1138, 63%). On multivariable analysis, neonates [adjusted OR (aOR), 2.2; 95% CI, 1.5-3.1; P < 0.001] and patients diagnosed in Gauteng province (aOR, 1.9; 95% CI, 1.3-2.7; P < 0.001) or in the private sector (aOR, 1.9; 95% CI, 1.2-3.2; P = 0.008) were significantly more likely to be infected with Candida parapsilosis than any other Candida species. Of 531 C. parapsilosis isolates, only 199 (37%) were susceptible to fluconazole and voriconazole; 44% (123/282) of fluconazole-resistant isolates were voriconazole cross-resistant. Factors associated with fluconazole non-susceptible C. parapsilosis infection on multivariable analysis included diagnosis in Gauteng province (aOR, 4.2; 95% CI, 2.7-6.7; P < 0.001), an ICU (aOR, 2.3; 95% CI, 1.5-3.6; P < 0.001) or the private sector (aOR, 2.2; 95% CI, 1.4-3.5; P < 0.001). CONCLUSIONS The dominance of triazole non-susceptible C. parapsilosis limits the choice of antifungal agents for management of candidaemia among critically ill neonates, children and adults in resource-limited South African hospitals.
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Affiliation(s)
- Nelesh P Govender
- National Institute for Communicable Diseases-Centre for Opportunistic, Tropical and Hospital Infections, a Division of the National Health Laboratory Service, Johannesburg, South Africa Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Jaymati Patel
- National Institute for Communicable Diseases-Centre for Opportunistic, Tropical and Hospital Infections, a Division of the National Health Laboratory Service, Johannesburg, South Africa
| | - Rindidzani E Magobo
- National Institute for Communicable Diseases-Centre for Opportunistic, Tropical and Hospital Infections, a Division of the National Health Laboratory Service, Johannesburg, South Africa Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Serisha Naicker
- National Institute for Communicable Diseases-Centre for Opportunistic, Tropical and Hospital Infections, a Division of the National Health Laboratory Service, Johannesburg, South Africa
| | - Jeannette Wadula
- Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa Chris Hani Baragwanath Hospital, National Health Laboratory Service, Johannesburg, South Africa
| | - Andrew Whitelaw
- Tygerberg Hospital, National Health Laboratory Service and Faculty of Health Sciences, Stellenbosch University, Cape Town, South Africa
| | - Yacoob Coovadia
- Inkosi Albert Luthuli Hospital, National Health Laboratory Service and Faculty of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Ranmini Kularatne
- Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa Helen Joseph Hospital, National Health Laboratory Service, Johannesburg, South Africa
| | | | - Shawn R Lockhart
- Mycotic Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Inge L Zietsman
- Ampath National Laboratory Service, Johannesburg, South Africa
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275
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Potassium Uptake Mediated by Trk1 Is Crucial for Candida glabrata Growth and Fitness. PLoS One 2016; 11:e0153374. [PMID: 27058598 PMCID: PMC4825953 DOI: 10.1371/journal.pone.0153374] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 03/29/2016] [Indexed: 12/20/2022] Open
Abstract
The maintenance of potassium homeostasis is crucial for all types of cells, including Candida glabrata. Three types of plasma-membrane systems mediating potassium influx with different transport mechanisms have been described in yeasts: the Trk1 uniporter, the Hak cation-proton symporter and the Acu ATPase. The C. glabrata genome contains only one gene encoding putative system for potassium uptake, the Trk1 uniporter. Therefore, its importance in maintaining adequate levels of intracellular potassium appears to be critical for C. glabrata cells. In this study, we first confirmed the potassium-uptake activity of the identified gene’s product by heterologous expression in a suitable S. cerevisiae mutant, further we generated a corresponding deletion mutant in C. glabrata and analysed its phenotype in detail. The obtained results show a pleiotropic effect on the cell physiology when CgTRK1 is deleted, affecting not only the ability of trk1Δ to grow at low potassium concentrations, but also the tolerance to toxic alkali-metal cations and cationic drugs, as well as the membrane potential and intracellular pH. Taken together, our results find the sole potassium uptake system in C. glabrata cells to be a promising target in the search for its specific inhibitors and in developing new antifungal drugs.
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276
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Fungi from a Groundwater-Fed Drinking Water Supply System in Brazil. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2016; 13:ijerph13030304. [PMID: 27005653 PMCID: PMC4808967 DOI: 10.3390/ijerph13030304] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 02/28/2016] [Accepted: 03/04/2016] [Indexed: 01/10/2023]
Abstract
Filamentous fungi in drinking water distribution systems are known to (a) block water pipes; (b) cause organoleptic biodeterioration; (c) act as pathogens or allergens and (d) cause mycotoxin contamination. Yeasts might also cause problems. This study describes the occurrence of several fungal species in a water distribution system supplied by groundwater in Recife—Pernambuco, Brazil. Water samples were collected from four sampling sites from which fungi were recovered by membrane filtration. The numbers in all sampling sites ranged from 5 to 207 colony forming units (CFU)/100 mL with a mean value of 53 CFU/100 mL. In total, 859 isolates were identified morphologically, with Aspergillus and Penicillium the most representative genera (37% and 25% respectively), followed by Trichoderma and Fusarium (9% each), Curvularia (5%) and finally the species Pestalotiopsis karstenii (2%). Ramichloridium and Leptodontium were isolated and are black yeasts, a group that include emergent pathogens. The drinking water system in Recife may play a role in fungal dissemination, including opportunistic pathogens.
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277
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Chang H, Ashu E, Sharma C, Kathuria S, Chowdhary A, Xu J. Diversity and origins of Indian multi-triazole resistant strains of Aspergillus fumigatus. Mycoses 2016; 59:450-66. [PMID: 26931802 DOI: 10.1111/myc.12494] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 02/04/2016] [Accepted: 02/04/2016] [Indexed: 12/11/2022]
Abstract
Aspergillus fumigatus is a widespread opportunistic fungal pathogen causing an alarmingly high mortality rate in immunocompromised patients. Nosocomial infections by drug-resistant A. fumigatus strains are of particular concern, and there is a pressing need to understand the origin, dispersal and long-term evolution of drug resistance in this organism. The objective of this study was to investigate the diversity and putative origins of triazole resistance of A. fumigatus from India. Eighty-nine isolates, including 51 multiple triazole resistant (MTR) isolates and 38 azole-susceptible isolates, were genotyped using multilocus sequence typing (MLST), mating typing and PCR fingerprinting. MLST resolved the 51 MTR isolates into three genotypes, two of which have susceptible counterparts, suggesting that MTR isolates originated multiple times in India. The multiple-origin hypothesis was further supported by the diversity of sequences at the triazole target gene CYP51A among the MTR isolates, and by PCR fingerprints. Interestingly, there is abundant evidence for mating and recombination in natural population of A. fumigatus in India, suggesting that sexual spread of TR34 /L98H, the dominant MTR allele, is possible. Our results call for greater attention to MTR in A. fumigatus and for better management of antifungal drug use.
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Affiliation(s)
- Howard Chang
- Department of Biology, McMaster University, Hamilton, ON, Canada
| | - Eta Ashu
- Department of Biology, McMaster University, Hamilton, ON, Canada
| | - Cheshta Sharma
- Department of Medical Mycology, Vallabhbhai Patel Chest Institute, University of Delhi, Delhi, India
| | - Shallu Kathuria
- Department of Medical Mycology, Vallabhbhai Patel Chest Institute, University of Delhi, Delhi, India
| | - Anuradha Chowdhary
- Department of Medical Mycology, Vallabhbhai Patel Chest Institute, University of Delhi, Delhi, India
| | - Jianping Xu
- Department of Biology, McMaster University, Hamilton, ON, Canada
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278
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Höfs S, Mogavero S, Hube B. Interaction of Candida albicans with host cells: virulence factors, host defense, escape strategies, and the microbiota. J Microbiol 2016; 54:149-69. [DOI: 10.1007/s12275-016-5514-0] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 11/03/2015] [Accepted: 11/07/2015] [Indexed: 12/20/2022]
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279
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Pemmaraju SC, Pruthi PA, Prasad R, Pruthi V. Modulation of Candida albicans Biofilm by Different Carbon Sources. Mycopathologia 2016; 181:341-52. [PMID: 26899861 DOI: 10.1007/s11046-016-9992-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Accepted: 02/04/2016] [Indexed: 11/26/2022]
Abstract
In the present investigation, the role of carbon sources (glucose, lactate, sucrose, and arabinose) on Candida albicans biofilm development and virulence factors was studied on polystyrene microtiter plates. Besides this, structural changes in cell wall component β-glucan in presence of different carbon sources have also been highlighted. Biofilm formation was analyzed by XTT (2,3-bis[2-Methoxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide) reduction assay. Glucose-grown cells exhibited the highest metabolic activity during adhesion among all carbon sources tested (p < 0.05). However, cells exposed to sucrose exhibited highest biofilm formation and matrix polysaccharides secretion after 48 h. The results also correlated with the biofilm height and roughness measurements by atomic force microscopy. Exposure to lactate induced hyphal structures with the highest proteinase activity while arabinose-grown cells formed pseudohyphal structures possessing the highest phospholipase activity. Structural changes in β-glucan characterized by Fourier transform infrared (FTIR) spectroscopy displayed characteristic band of β-glucan at 892 cm(-1) in all carbon sources tested. The β(1→6) to β(1→3) glucan ratio calculated as per the band area of the peak was less in lactate (1.15) as compared to glucose (1.73), sucrose (1.62), and arabinose (2.85). These results signify that carbon sources influence C. albicans biofilm development and modulate virulence factors and structural organization of cell wall component β-glucan.
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Affiliation(s)
- Suma C Pemmaraju
- Molecular Microbiology Lab, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee, Uttarakhand, 247667, India
| | - Parul A Pruthi
- Molecular Microbiology Lab, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee, Uttarakhand, 247667, India
| | - R Prasad
- Molecular Biology and Proteomics Lab, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee, Uttarakhand, 247667, India
| | - Vikas Pruthi
- Molecular Microbiology Lab, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT Roorkee), Roorkee, Uttarakhand, 247667, India.
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280
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Cunden LS, Gaillard A, Nolan EM. Calcium Ions Tune the Zinc-Sequestering Properties and Antimicrobial Activity of Human S100A12. Chem Sci 2016; 7:1338-1348. [PMID: 26913170 PMCID: PMC4762610 DOI: 10.1039/c5sc03655k] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Accepted: 10/26/2015] [Indexed: 12/15/2022] Open
Abstract
Human S100A12 is a host-defense protein expressed and released by neutrophils that contributes to innate immunity. Apo S100A12 is a 21-kDa antiparallel homodimer that harbors two Ca(II)-binding EF-hand domains per subunit and exhibits two His3Asp motifs for chelating transition metal ions at the homodimer interface. In this work, we present results from metal-binding studies and microbiology assays designed to ascertain whether Ca(II) ions modulate the Zn(II)-binding properties of S100A12 and further evaluate the antimicrobial properties of this protein. Our metal depletion studies reveal that Ca(II) ions enhance the ability of S100A12 to sequester Zn(II) from microbial growth media. We report that human S100A12 has antifungal activity against Candida albicans, C. krusei, C. glabrata and C. tropicalis, all of which cause human disease. This antifungal activity is Ca(II)-dependent and requires the His3Asp metal-binding sites. We expand upon prior studies of the antibacterial activity of S100A12 and report Ca(II)-dependent and strain-selective behavior. S100A12 exhibited in vitro growth inhibitory activity against Listeria monocytogenes. In contrast, S100A12 had negligible effect on the growth of Escherichia coli K-12 and Pseudomonas aeruginosa PAO1. Loss of functional ZnuABC, a high-affinity Zn(II) import system, increased the susceptibility of E. coli and P. aeruginosa to S100A12, indicating that S100A12 deprives these mutant strains of Zn(II). To evaluate the Zn(II)-binding sites of S100A12 in solution, we present studies using Co(II) as a spectroscopic probe and chromophoric small-molecule chelators in Zn(II) competition titrations. We confirm that S100A12 binds Zn(II) with a 2:1 stoichiometry, and our data indicate sub-nanomolar affinity binding. Taken together, these data support a model whereby S100A12 uses Ca(II) ions to tune its Zn(II)-chelating properties and antimicrobial activity.
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Affiliation(s)
- Lisa S. Cunden
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , MA 02139 , USA . ; Fax: +1-617-324-0505 ; Tel: +1-617-452-2495
| | - Aleth Gaillard
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , MA 02139 , USA . ; Fax: +1-617-324-0505 ; Tel: +1-617-452-2495
| | - Elizabeth M. Nolan
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , MA 02139 , USA . ; Fax: +1-617-324-0505 ; Tel: +1-617-452-2495
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281
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In vitro interactions between anidulafungin and nonsteroidal anti-inflammatory drugs on biofilms of Candida spp. Bioorg Med Chem 2016; 24:1002-5. [PMID: 26833243 DOI: 10.1016/j.bmc.2016.01.026] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 01/14/2016] [Indexed: 11/21/2022]
Abstract
Candida spp. are responsible for many biomaterial-related infections; they give rise to infective pathologies typically associated with biofilm formation. We recently reported that the echinocandin anidulafungin (ANF) showed a strong in vitro activity against both planktonic and biofilms cells. Herein, we report the antifungal activities of ANF alone and in association with some non-steroidal anti-inflammatory drugs (NSAIDs) against nine Candida strain biofilms: four Candida albicans, two Candida glabrata and three Candida guilliermondii. The activity of ANF was assessed using an in vitro microbiological model relevant for clinical practice. ANF proved oneself to be active against biofilms cells, and a clear-cut synergism was found against Candida species biofilms when ANF was used in combination with three NSAIDs: aspirin, diclofenac, ibuprofen. The positive synergism against Candida spp. of ANF in association with aspirin or the other NSAIDs proved to be a very effective antifungal treatment (FICI<0.5). These results may provide the starting point for new combination therapies of ANF with NSAIDs against Candida biofilm pathologies.
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282
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Barros de Andrade E Sousa LC, Kühn C, Tyc KM, Klipp E. Dosage and Dose Schedule Screening of Drug Combinations in Agent-Based Models Reveals Hidden Synergies. Front Physiol 2016; 6:398. [PMID: 26779031 PMCID: PMC4701919 DOI: 10.3389/fphys.2015.00398] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2015] [Accepted: 12/07/2015] [Indexed: 12/02/2022] Open
Abstract
The fungus Candida albicans is the most common causative agent of human fungal infections and better drugs or drug combination strategies are urgently needed. Here, we present an agent-based model of the interplay of C. albicans with the host immune system and with the microflora of the host. We took into account the morphological change of C. albicans from the yeast to hyphae form and its dynamics during infection. The model allowed us to follow the dynamics of fungal growth and morphology, of the immune cells and of microflora in different perturbing situations. We specifically focused on the consequences of microflora reduction following antibiotic treatment. Using the agent-based model, different drug types have been tested for their effectiveness, namely drugs that inhibit cell division and drugs that constrain the yeast-to-hyphae transition. Applied individually, the division drug turned out to successfully decrease hyphae while the transition drug leads to a burst in hyphae after the end of the treatment. To evaluate the effect of different drug combinations, doses, and schedules, we introduced a measure for the return to a healthy state, the infection score. Using this measure, we found that the addition of a transition drug to a division drug treatment can improve the treatment reliability while minimizing treatment duration and drug dosage. In this work we present a theoretical study. Although our model has not been calibrated to quantitative experimental data, the technique of computationally identifying synergistic treatment combinations in an agent based model exemplifies the importance of computational techniques in translational research.
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Affiliation(s)
- Lisa C Barros de Andrade E Sousa
- Theoretische Biophysik, Humboldt-Universität zu BerlinBerlin, Germany; RNA Bioinformatics, Max Planck Institute for Molecular GeneticsBerlin, Germany
| | - Clemens Kühn
- Theoretische Biophysik, Humboldt-Universität zu Berlin Berlin, Germany
| | - Katarzyna M Tyc
- Theoretische Biophysik, Humboldt-Universität zu Berlin Berlin, Germany
| | - Edda Klipp
- Theoretische Biophysik, Humboldt-Universität zu Berlin Berlin, Germany
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283
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Saul SR, Aleksic S, Magnotti M. A Patient with Newly Diagnosed Diabetes Presenting with Sino-Orbital Mucormycosis. AACE Clin Case Rep 2016. [DOI: 10.4158/ep14559.cr] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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284
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Szczepaniak J, Łukaszewicz M, Krasowska A. Estimation of Candida albicans ABC Transporter Behavior in Real-Time via Fluorescence. Front Microbiol 2015; 6:1382. [PMID: 26696990 PMCID: PMC4673308 DOI: 10.3389/fmicb.2015.01382] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 11/20/2015] [Indexed: 11/13/2022] Open
Abstract
We present a fluorometric method for determining ABC transporter activity in the pathogenic fungus C. albicans during different growth phases and in response to glucose. The carbocyanine dye diS-C3(3) was previously used to monitor plasma membrane potentials and test the influence of surface-active compounds in membrane polarization. We used diS-C3(3) to show changes in fluorescence kinetics that reflect changes in the activity of ABC transporters in C. albicans growth. Cdr1-GFP fluorescence, revealed that Cdr1p relocates to the inside of the cell after the early-log growth phase. Addition of glucose to the cell suspension resulted in Cdr1p transporter expression in the CDR2-knockout strain. We confirmed the diS-C3(3) results by standard RT-PCR and Western blotting.
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Affiliation(s)
| | | | - Anna Krasowska
- Faculty of Biotechnology, University of Wroclaw Wroclaw, Poland
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285
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Teixeira J, Amorim A, Araujo R. Recombination detection in Aspergillus fumigatus through single nucleotide polymorphisms typing. ENVIRONMENTAL MICROBIOLOGY REPORTS 2015; 7:881-886. [PMID: 26189756 DOI: 10.1111/1758-2229.12321] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 06/27/2015] [Accepted: 07/10/2015] [Indexed: 06/04/2023]
Abstract
The first evidence of sexual reproduction in Aspergillus fumigatus was reported in 2009. Nevertheless, it remains difficult to understand how A. fumigatus is able to reproduce through this mode in its natural environment and how frequently this occurs. The aim of this study was to analyse single nucleotide polymorphisms (SNPs) in a set of environmental and clinical isolates of A. fumigatus to detect signatures of recombination. A group of closely related Portuguese A. fumigatus isolates was characterized by mating type and the genetic diversity of the intergenic regions, microsatellites and multilocus sequence typing (MLST) genes. A group of 19 SNPs, organized in nine association groups and inherited in blocks, was identified and compared. Several variations on the association panel were detected on reference isolates of A. fumigatus AF293 and A1163, the sequence types available at MLST database and six clinical and environmental Portuguese isolates. About one to four haplotype disruptions were observed per isolate. Considering clinical and environmental isolates, sexual reproduction seems to occur more frequently than previously admitted in A. fumigatus. In this study, a practical SNP approach is proposed for detection of recombination events in larger collections of A. fumigatus.
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Affiliation(s)
- Joana Teixeira
- IPATIMUP, Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
| | - António Amorim
- IPATIMUP, Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
- Faculty of Sciences, University of Porto, Porto, Portugal
| | - Ricardo Araujo
- IPATIMUP, Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal
- Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal
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286
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Medici NP, Del Poeta M. New insights on the development of fungal vaccines: from immunity to recent challenges. Mem Inst Oswaldo Cruz 2015; 110:966-73. [PMID: 26602871 PMCID: PMC4708015 DOI: 10.1590/0074-02760150335] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 09/28/2015] [Indexed: 12/14/2022] Open
Abstract
Fungal infections are emerging as a major problem in part due to high mortality associated with systemic infections, especially in the case of immunocompromised patients. With the development of new treatments for diseases such as cancer and the acquired immune deficiency syndrome pandemic, the number of immunosuppressed patients has increased and, as a consequence, also the number of invasive fungal infections has increased. Several studies have proposed new strategies for the development of effective fungal vaccines. In addition, better understanding of how the immune system works against fungal pathogens has improved the further development of these new vaccination strategies. As a result, some fungal vaccines have advanced through clinical trials. However, there are still many challenges that prevent the clinical development of fungal vaccines that can efficiently immunise subjects at risk of developing invasive fungal infections. In this review, we will discuss these new vaccination strategies and the challenges that they present. In the future with proper investments, fungal vaccines may soon become a reality.
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Affiliation(s)
- Natasha P Medici
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, NY, USA
| | - Maurizio Del Poeta
- Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, NY, USA
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287
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Development and In Vivo Evaluation of a Novel Histatin-5 Bioadhesive Hydrogel Formulation against Oral Candidiasis. Antimicrob Agents Chemother 2015; 60:881-9. [PMID: 26596951 DOI: 10.1128/aac.02624-15] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 11/18/2015] [Indexed: 01/09/2023] Open
Abstract
Oral candidiasis (OC), caused by the fungal pathogen Candida albicans, is the most common opportunistic infection in HIV(+) individuals and other immunocompromised populations. The dramatic increase in resistance to common antifungals has emphasized the importance of identifying unconventional therapeutic options. Antimicrobial peptides have emerged as promising candidates for therapeutic intervention due to their broad antimicrobial properties and lack of toxicity. Histatin-5 (Hst-5) specifically has exhibited potent anticandidal activity indicating its potential as an antifungal agent. To that end, the goal of this study was to design a biocompatible hydrogel delivery system for Hst-5 application. The bioadhesive hydroxypropyl methylcellulose (HPMC) hydrogel formulation was developed for topical oral application against OC. The new formulation was evaluated in vitro for gel viscosity, Hst-5 release rate from the gel, and killing potency and, more importantly, was tested in vivo in our mouse model of OC. The findings demonstrated a controlled sustained release of Hst-5 from the polymer and rapid killing ability. Based on viable C. albicans counts recovered from tongues of treated and untreated mice, three daily applications of the formulation beginning 1 day postinfection with C. albicans were effective in protection against development of OC. Interestingly, in some cases, Hst-5 was able to clear existing lesions as well as associated tissue inflammation. These findings were confirmed by histopathology analysis of tongue tissue. Coupled with the lack of toxicity as well as anti-inflammatory and wound-healing properties of Hst-5, the findings from this study support the progression and commercial feasibility of using this compound as a novel therapeutic agent.
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288
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Kassiri H, Zarrin M, Veys-Behbahani R, Faramarzi S, Kasiri A. Isolation and Identification of Pathogenic Filamentous Fungi and Yeasts From Adult House Fly (Diptera: Muscidae) Captured From the Hospital Environments in Ahvaz City, Southwestern Iran. JOURNAL OF MEDICAL ENTOMOLOGY 2015; 52:1351-1356. [PMID: 26405077 DOI: 10.1093/jme/tjv140] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 08/26/2015] [Indexed: 06/05/2023]
Abstract
Musca domestica L., 1758 is capable of transferring a number of pathogenic viruses, bacteria, fungi, and parasites to animals and humans. The objective of this study was to isolate and identify medically important filamentous fungi and yeasts from adult M. domestica collected from two wards of three hospital environments in Ahvaz city, Khuzestan Province, southwestern Iran. The common house flies were caught by a sterile net. These insects were washed in a solution of 1% sodium hypochlorite for 3 min and twice in sterile distilled water for 1 min. The flies were individually crushed with sterile swabs in sterile test tubes. Then 2 ml of sterile normal saline (0.85%) was added to each tube, and the tube was centrifuged for 5 min. The supernatant was then discarded, and the remaining sediment was inoculated with a sterile swab in the Sabouraud's dextrose agar medium containing chloramphenicol. Isolation and identification of fungi were made by standard mycological methods. In this research, totally 190 M. domestica from hospital environments were captured. In total, 28 fungal species were isolated. The main fungi isolated were Aspergillus spp. (67.4%), Penicillium sp. (11.6%), Mucorales sp. (11%), Candida spp. (10.5%), and Rhodotorula sp. (8.4%). Among the house flies caught at the hospitals, about 80% were found to carry one or more medically important species of fungi. This study has established that common house flies carry pathogenic fungi in the hospital environments of Ahvaz. The control of M. domestica in hospitals is essential in order to control the nosocomial fungal infections in patients.
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Affiliation(s)
- Hamid Kassiri
- Medical Entomology and Vector Control, Health Faculty, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
| | - Majid Zarrin
- Medical Mycology Department, Medicine Faculty, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Rahele Veys-Behbahani
- Medical Entomology and Vector Control, Health Faculty, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Sama Faramarzi
- Medical Mycology Department, Medicine Faculty, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Ali Kasiri
- Ophthalmology Department, Medicine Faculty, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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289
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Pais P, Costa C, Pires C, Shimizu K, Chibana H, Teixeira MC. Membrane Proteome-Wide Response to the Antifungal Drug Clotrimazole in Candida glabrata: Role of the Transcription Factor CgPdr1 and the Drug:H+ Antiporters CgTpo1_1 and CgTpo1_2. Mol Cell Proteomics 2015; 15:57-72. [PMID: 26512119 DOI: 10.1074/mcp.m114.045344] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Indexed: 01/12/2023] Open
Abstract
Azoles are widely used antifungal drugs. This family of compounds includes triazoles, mostly used in the treatment of systemic infections, and imidazoles, such as clotrimazole, often used in the case of superficial infections. Candida glabrata is the second most common cause of candidemia worldwide and presents higher levels of intrinsic azole resistance when compared with Candida albicans, thus being an interesting subject for the study of azole resistance mechanisms in fungal pathogens.Since resistance often relies on the action of membrane transporters, including drug efflux pumps from the ATP-binding cassette family or from the Drug:H(+) antiporter (DHA)(1) family, an iTRAQ-based membrane proteomics analysis was performed to identify all the membrane-associated proteins whose abundance changes in C. glabrata cells exposed to the azole drug clotrimazole. Proteins found to have significant expression changes in this context were clustered into functional groups, namely: glucose metabolism, oxidative phosphorylation, mitochondrial import, ribosome components and translation machinery, lipid metabolism, multidrug resistance transporters, cell wall assembly, and stress response, comprising a total of 37 proteins. Among these, the DHA transporter CgTpo1_2 (ORF CAGL0E03674g) was identified as overexpressed in the C. glabrata membrane in response to clotrimazole. Functional characterization of this putative drug:H(+) antiporter, and of its homolog CgTpo1_1 (ORF CAGL0G03927g), allowed the identification of these proteins as localized to the plasma membrane and conferring azole drug resistance in this fungal pathogen by actively extruding the drug to the external medium. The cell wall protein CgGas1 was also shown to confer azole drug resistance through cell wall remodeling. Finally, the transcription factor CgPdr1 in the clotrimazole response was observed to control the expression of 20 of the identified proteins, thus highlighting the existence of additional unforeseen targets of this transcription factor, recognized as a major regulator of azole drug resistance in clinical isolates.
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Affiliation(s)
- Pedro Pais
- From the ‡Department of Bioengineering and §IBB-Institute for Bioengineering and Biosciences, Biological Research Group, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Catarina Costa
- From the ‡Department of Bioengineering and §IBB-Institute for Bioengineering and Biosciences, Biological Research Group, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Carla Pires
- From the ‡Department of Bioengineering and §IBB-Institute for Bioengineering and Biosciences, Biological Research Group, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Kiminori Shimizu
- ¶Medical Mycology Research Center (MMRC), Chiba University, Chiba, Japan
| | - Hiroji Chibana
- ¶Medical Mycology Research Center (MMRC), Chiba University, Chiba, Japan
| | - Miguel C Teixeira
- From the ‡Department of Bioengineering and §IBB-Institute for Bioengineering and Biosciences, Biological Research Group, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal;
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290
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Adjapong G, Hale M, Garrill A. Population Structure ofCandida albicansfrom Three Teaching Hospitals in Ghana. Med Mycol 2015; 54:197-206. [DOI: 10.1093/mmy/myv086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 08/18/2015] [Indexed: 11/15/2022] Open
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291
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Roy S, Thompson D. Evolution of regulatory networks in Candida glabrata: learning to live with the human host. FEMS Yeast Res 2015; 15:fov087. [PMID: 26449820 DOI: 10.1093/femsyr/fov087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/17/2015] [Indexed: 12/12/2022] Open
Abstract
The opportunistic human fungal pathogen Candida glabrata is second only to C. albicans as the cause of Candida infections and yet is more closely related to Saccharomyces cerevisiae. Recent advances in functional genomics technologies and computational approaches to decipher regulatory networks, and the comparison of these networks among these and other Ascomycete species, have revealed both unique and shared strategies in adaptation to a human commensal/opportunistic pathogen lifestyle and antifungal drug resistance in C. glabrata. Recently, several C. glabrata sister species in the Nakeseomyces clade representing both human associated (commensal) and environmental isolates have had their genomes sequenced and analyzed. This has paved the way for comparative functional genomics studies to characterize the regulatory networks in these species to identify informative patterns of conservation and divergence linked to phenotypic evolution in the Nakaseomyces lineage.
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Affiliation(s)
- Sushmita Roy
- Department of Biostatistics and Medical Informatics, University of Wisconsin Madison, Madison, WI 53715, USA Wisconsin Institute for Discovery, University of Wisconsin, Madison, WI 53715, USA
| | - Dawn Thompson
- Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA
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292
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Ashu EE, Xu J. The roles of sexual and asexual reproduction in the origin and dissemination of strains causing fungal infectious disease outbreaks. INFECTION GENETICS AND EVOLUTION 2015; 36:199-209. [PMID: 26394109 DOI: 10.1016/j.meegid.2015.09.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 09/16/2015] [Accepted: 09/18/2015] [Indexed: 12/15/2022]
Abstract
Sexual reproduction commonly refers to the reproductive process in which genomes from two sources are combined into a single cell through mating and then the zygote genomes are partitioned to progeny cells through meiosis. Reproduction in the absence of mating and meiosis is referred to as asexual or clonal reproduction. One major advantage of sexual reproduction is that it generates genetic variation among progeny which may allow for faster adaptation of the population to novel and/or stressful environments. However, adaptation to stressful or new environments can still occur through mutation, in the absence of sex. In this review, we analyzed the relative contributions of sexual and asexual reproduction in the origin and spread of strains causing fungal infectious diseases outbreaks. The necessity of sex and the ability of asexual fungi to initiate outbreaks are discussed. We propose a framework that relates the modes of reproduction to the origin and propagation of fungal disease outbreaks. Our analyses suggest that both sexual and asexual reproduction can play critical roles in the origin of outbreak strains and that the rapid spread of outbreak strains is often accomplished through asexual expansion.
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Affiliation(s)
- Eta Ebasi Ashu
- Department of Biology, McMaster University, 1280 Main St. W, Hamilton, ON L8S 4K1, Canada
| | - Jianping Xu
- Department of Biology, McMaster University, 1280 Main St. W, Hamilton, ON L8S 4K1, Canada.
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293
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Candida albicans adapts to host copper during infection by swapping metal cofactors for superoxide dismutase. Proc Natl Acad Sci U S A 2015; 112:E5336-42. [PMID: 26351691 DOI: 10.1073/pnas.1513447112] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Copper is both an essential nutrient and potentially toxic metal, and during infection the host can exploit Cu in the control of pathogen growth. Here we describe a clever adaptation to Cu taken by the human fungal pathogen Candida albicans. In laboratory cultures with abundant Cu, C. albicans expresses a Cu-requiring form of superoxide dismutase (Sod1) in the cytosol; but when Cu levels decline, cells switch to an alternative Mn-requiring Sod3. This toggling between Cu- and Mn-SODs is controlled by the Cu-sensing regulator Mac1 and ensures that C. albicans maintains constant SOD activity for cytosolic antioxidant protection despite fluctuating Cu. This response to Cu is initiated during C. albicans invasion of the host where the yeast is exposed to wide variations in Cu. In a murine model of disseminated candidiasis, serum Cu was seen to progressively rise over the course of infection, but this heightened Cu response was not mirrored in host tissue. The kidney that serves as the major site of fungal infection showed an initial rise in Cu, followed by a decline in the metal. C. albicans adjusted its cytosolic SODs accordingly and expressed Cu-Sod1 at early stages of infection, followed by induction of Mn-Sod3 and increases in expression of CTR1 for Cu uptake. Together, these studies demonstrate that fungal infection triggers marked fluctuations in host Cu and C. albicans readily adapts by modulating Cu uptake and by exchanging metal cofactors for antioxidant SODs.
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294
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Candida parapsilosis Endocarditis Presenting on Native Valve With Cerebrovascular Accident and Myocardial Infarction. INFECTIOUS DISEASES IN CLINICAL PRACTICE 2015. [DOI: 10.1097/ipc.0000000000000292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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295
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Huyke J, Martin R, Walther G, Weber M, Kaerger K, Bougnoux ME, Elias J, Kurzai O. Candida albicans bloodstream isolates in a German university hospital are genetically heterogenous and susceptible to commonly used antifungals. Int J Med Microbiol 2015; 305:742-7. [PMID: 26324013 DOI: 10.1016/j.ijmm.2015.08.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
From an eight-year-span, 99 Candida bloodstream isolates were collected at the University Hospital Wuerzburg, Germany. In this study, all strains were analyzed using molecular and phenotypic typing methods. Confirmatory species identification revealed three isolates that were initially diagnosed as C. albicans to be actually C. dubliniensis. Two isolates contained a mixed culture of C. albicans and C. glabrata, in one of the specimens both species could be separated while it was not possible to recover C. albicans in the other sample. The remaining 95 C. albicans isolates were profiled by multilocus sequence typing (MLST). Phylogenetic analyses showed a highly heterogenous collection of strains, associated with many different clades and constituting a set of new diploid sequence types (DST). For all strains with identical DST, patient data were reviewed for potential nosocomial transmission. In addition, all isolates were tested for their susceptibility to amphotericin B, caspofungin, fluconazole, itraconazole, posaconazole and voriconazole. No clinically relevant resistance could be detected. Furthermore, these data underline that correlation between minimal inhibitory concentrations for caspofungin and anidulafungin is low.
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Affiliation(s)
- Johanna Huyke
- National Reference Center for Invasive Mycoses, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knoell Institute, Jena, Germany; Septomics Research Center, Friedrich Schiller University and Leibniz Institute for Natural Product Research and Infection Biology - Hans Knoell Institute, Jena, Germany
| | - Ronny Martin
- Septomics Research Center, Friedrich Schiller University and Leibniz Institute for Natural Product Research and Infection Biology - Hans Knoell Institute, Jena, Germany
| | - Grit Walther
- National Reference Center for Invasive Mycoses, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knoell Institute, Jena, Germany
| | - Michael Weber
- Septomics Research Center, Friedrich Schiller University and Leibniz Institute for Natural Product Research and Infection Biology - Hans Knoell Institute, Jena, Germany
| | - Kerstin Kaerger
- National Reference Center for Invasive Mycoses, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knoell Institute, Jena, Germany
| | - Marie-Elisabeth Bougnoux
- Institut Pasteur, Unité Biologie et Pathogénicité Fongiques INRA USC2019 Laboratoire de Parasitologie-Mycologie, Service de Microbiologie, Hôpital Necker-Enfants Malades, Université Paris Descartes, Faculté de Médecine, Paris, France
| | - Johannes Elias
- University of Wuerzburg, Institute of Hygiene and Microbiology, Wuerzburg, Germany
| | - Oliver Kurzai
- National Reference Center for Invasive Mycoses, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knoell Institute, Jena, Germany; Septomics Research Center, Friedrich Schiller University and Leibniz Institute for Natural Product Research and Infection Biology - Hans Knoell Institute, Jena, Germany.
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296
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O'Donnell LE, Millhouse E, Sherry L, Kean R, Malcolm J, Nile CJ, Ramage G. PolymicrobialCandidabiofilms: friends and foe in the oral cavity. FEMS Yeast Res 2015; 15:fov077. [DOI: 10.1093/femsyr/fov077] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/14/2015] [Indexed: 12/26/2022] Open
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297
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Systems Level Dissection of Candida Recognition by Dectins: A Matter of Fungal Morphology and Site of Infection. Pathogens 2015; 4:639-61. [PMID: 26308062 PMCID: PMC4584279 DOI: 10.3390/pathogens4030639] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2015] [Revised: 08/17/2015] [Accepted: 08/17/2015] [Indexed: 12/14/2022] Open
Abstract
Candida albicans is an ubiquitous fungal commensal of human skin and mucosal surfaces, and at the same time a major life-threatening human fungal pathogen in immunocompromised individuals. Host defense mechanisms rely on the capacity of professional phagocytes to recognize Candida cell wall antigens. During the past decade, the host immune response to Candida was dissected in depth, highlighting the essential role of C-type lectin receptors, especially regarding the power of the Dectins’ family in discriminating between the tolerated yeast-like form of Candida and its invading counterpart, the hyphae. This review focuses on the immuno-modulatory properties of the Candida morphologies and their specific interactions with the host innate immune system in different body surfaces.
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298
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Coelho PSR, Im H, Clemons KV, Snyder MP, Stevens DA. Evaluating Common Humoral Responses against Fungal Infections with Yeast Protein Microarrays. J Proteome Res 2015; 14:3924-31. [PMID: 26258609 DOI: 10.1021/acs.jproteome.5b00365] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We profiled the global immunoglobulin response against fungal infection by using yeast protein microarrays. Groups of CD-1 mice were infected systemically with human fungal pathogens (Coccidioides posadasii, Candida albicans, or Paracoccidioides brasiliensis) or inoculated with PBS as a control. Another group was inoculated with heat-killed yeast (HKY) of Saccharomyces cerevisiae. After 30 days, serum from mice in the groups were collected and used to probe S. cerevisiae protein microarrays containing 4800 full-length glutathione S-transferase (GST)-fusion proteins. Antimouse IgG conjugated with Alexafluor 555 and anti-GST antibody conjugated with Alexafluor 647 were used to detect antibody-antigen interactions and the presence of GST-fusion proteins, respectively. Serum after infection with C. albicans reacted with 121 proteins: C. posadasii, 81; P. brasiliensis, 67; and after HKY, 63 proteins on the yeast protein microarray, respectively. We identified a set of 16 antigenic proteins that were shared across the three fungal pathogens. These include retrotransposon capsid proteins, heat shock proteins, and mitochondrial proteins. Five of these proteins were identified in our previous study of fungal cell wall by mass spectrometry (Ann. N. Y. Acad. Sci. 2012, 1273, 44-51). The results obtained give a comprehensive view of the immunological responses to fungal infections at the proteomic level. They also offer insight into immunoreactive protein commonality among several fungal pathogens and provide a basis for a panfungal vaccine.
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Affiliation(s)
- Paulo S R Coelho
- Division of Infectious Diseases and Geographic Medicine, Stanford University , 300 Pasteur Drive, Lane L-134, Stanford, California 94305-5107, United States.,California Institute for Medical Research , 2260 Clove Drive, San Jose, California 95128, United States.,Departamento de Biologia Celular, Molecular e Bioagentes Patogênicos Faculdade de Medicina de Ribeirão Preto Avenida dos Bandeirantes, Universidade de São Paulo , Av. Bandeirantes, 3900, Ribeirão Preto, Sao Paulo 14049-900, Brasil
| | - Hogune Im
- Department of Genetics, Stanford University , 300 Pasteur Drive, Stanford, California 94305-5120, United States
| | - Karl V Clemons
- Division of Infectious Diseases and Geographic Medicine, Stanford University , 300 Pasteur Drive, Lane L-134, Stanford, California 94305-5107, United States.,California Institute for Medical Research , 2260 Clove Drive, San Jose, California 95128, United States
| | - Michael P Snyder
- Department of Genetics, Stanford University , 300 Pasteur Drive, Stanford, California 94305-5120, United States
| | - David A Stevens
- Division of Infectious Diseases and Geographic Medicine, Stanford University , 300 Pasteur Drive, Lane L-134, Stanford, California 94305-5107, United States.,California Institute for Medical Research , 2260 Clove Drive, San Jose, California 95128, United States
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299
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Diderrich R, Kock M, Maestre-Reyna M, Keller P, Steuber H, Rupp S, Essen LO, Mösch HU. Structural Hot Spots Determine Functional Diversity of the Candida glabrata Epithelial Adhesin Family. J Biol Chem 2015; 290:19597-613. [PMID: 26105055 PMCID: PMC4528126 DOI: 10.1074/jbc.m115.655654] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 05/20/2015] [Indexed: 11/06/2022] Open
Abstract
For host colonization, the human fungal pathogen Candida glabrata is known to utilize a large family of highly related surface-exposed cell wall proteins, the lectin-like epithelial adhesins (Epas). To reveal the structure-function relationships within the entire Epa family, we have performed a large scale functional analysis of the adhesion (A) domains of 17 Epa paralogs in combination with three-dimensional structural studies of selected members with cognate ligands. Our study shows that most EpaA domains exert lectin-like functions and together recognize a wide variety of glycans with terminal galactosides for conferring epithelial cell adhesion. We further identify several conserved and variable structural features within the diverse Epa ligand binding pockets, which affect affinity and specificity. These features rationalize why mere phylogenetic relationships within the Epa family are weak indicators for functional classification and explain how Epa-like adhesins have evolved in C. glabrata and related fungal species.
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Affiliation(s)
| | - Michael Kock
- Biochemistry, Philipps-Universität, 35043 Marburg, Germany
| | | | - Petra Keller
- the Fraunhofer-Institut für Grenzflächen und Bioverfahrenstechnik, 70569 Stuttgart, Germany, and
| | - Holger Steuber
- Biochemistry, Philipps-Universität, 35043 Marburg, Germany
| | - Steffen Rupp
- the Fraunhofer-Institut für Grenzflächen und Bioverfahrenstechnik, 70569 Stuttgart, Germany, and the Institut für Grenzflächenverfahrenstechnik und Plasmatechnologie, Universität Stuttgart, 70569 Stuttgart, Germany
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300
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Wu T, Cen L, Kaplan C, Zhou X, Lux R, Shi W, He X. Cellular Components Mediating Coadherence of Candida albicans and Fusobacterium nucleatum. J Dent Res 2015; 94:1432-8. [PMID: 26152186 DOI: 10.1177/0022034515593706] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Candida albicans is an opportunistic fungal pathogen found as part of the normal oral flora. It can be coisolated with Fusobacterium nucleatum, an opportunistic bacterial pathogen, from oral disease sites, such as those involved in refractory periodontitis and pulp necrosis. The physical coadherence between these 2 clinically important microbes has been well documented and suggested to play a role in facilitating their oral colonization and colocalization and contributing to polymicrobial pathogenesis. Previous studies indicated that the physical interaction between C. albicans and F. nucleatum was mediated by the carbohydrate components on the surface of C. albicans and the protein components on the Fusobaterium cell surface. However, the identities of the components involved still remain elusive. This study was aimed at identifying the genetic determinants involved in coaggregation between the 2 species. By screening a C. albicans SN152 mutant library and a panel of F. nucleatum 23726 outer membrane protein mutants, we identified FLO9, which encodes a putative adhesin-like cell wall mannoprotein of C. albicans and radD, an arginine-inhibitable adhesin-encoding gene in F. nucleatum that is involved in interspecies coadherence. Consistent with these findings, we demonstrated that the strong coaggregation between wild-type F. nucleatum 23726 and C. albicans SN152 in an in vitro assay could be greatly inhibited by arginine and mannose. Our study also suggested a complex multifaceted mechanism underlying physical interaction between C. albicans and F. nucleatum and for the first time revealed the identity of major genetic components involved in mediating the coaggregation. These observations provide useful knowledge for developing new targeted treatments for disrupting interactions between these 2 clinically relevant pathogens.
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Affiliation(s)
- T Wu
- School of Dentistry, University of California, Los Angeles, CA, USA
| | - L Cen
- School of Dentistry, University of California, Los Angeles, CA, USA
| | - C Kaplan
- C3 Jian, Inc., Marina del Rey, CA, USA
| | - X Zhou
- West China School of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - R Lux
- School of Dentistry, University of California, Los Angeles, CA, USA
| | - W Shi
- School of Dentistry, University of California, Los Angeles, CA, USA
| | - X He
- School of Dentistry, University of California, Los Angeles, CA, USA
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