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Yaakoub H, Mina S, Calenda A, Bouchara JP, Papon N. Oxidative stress response pathways in fungi. Cell Mol Life Sci 2022; 79:333. [PMID: 35648225 PMCID: PMC11071803 DOI: 10.1007/s00018-022-04353-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 04/21/2022] [Accepted: 05/05/2022] [Indexed: 11/03/2022]
Abstract
Fungal response to any stress is intricate, specific, and multilayered, though it employs only a few evolutionarily conserved regulators. This comes with the assumption that one regulator operates more than one stress-specific response. Although the assumption holds true, the current understanding of molecular mechanisms that drive response specificity and adequacy remains rudimentary. Deciphering the response of fungi to oxidative stress may help fill those knowledge gaps since it is one of the most encountered stress types in any kind of fungal niche. Data have been accumulating on the roles of the HOG pathway and Yap1- and Skn7-related pathways in mounting distinct and robust responses in fungi upon exposure to oxidative stress. Herein, we review recent and most relevant studies reporting the contribution of each of these pathways in response to oxidative stress in pathogenic and opportunistic fungi after giving a paralleled overview in two divergent models, the budding and fission yeasts. With the concept of stress-specific response and the importance of reactive oxygen species in fungal development, we first present a preface on the expanding domain of redox biology and oxidative stress.
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Affiliation(s)
- Hajar Yaakoub
- Univ Angers, Univ Brest, IRF, SFR ICAT, 49000, Angers, France
| | - Sara Mina
- Department of Medical Laboratory Sciences, Faculty of Health Sciences, Beirut Arab University, Beirut, Lebanon
| | | | | | - Nicolas Papon
- Univ Angers, Univ Brest, IRF, SFR ICAT, 49000, Angers, France.
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Rai LS, Singha R, Sanchez H, Chakraborty T, Chand B, Bachellier-Bassi S, Chowdhury S, d’Enfert C, Andes DR, Sanyal K. The Candida albicans biofilm gene circuit modulated at the chromatin level by a recent molecular histone innovation. PLoS Biol 2019; 17:e3000422. [PMID: 31398188 PMCID: PMC6703697 DOI: 10.1371/journal.pbio.3000422] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Revised: 08/21/2019] [Accepted: 07/17/2019] [Indexed: 02/07/2023] Open
Abstract
Histone H3 and its variants regulate gene expression but the latter are absent in most ascomycetous fungi. Here, we report the identification of a variant histone H3, which we have designated H3VCTG because of its exclusive presence in the CTG clade of ascomycetes, including Candida albicans, a human pathogen. C. albicans grows both as single yeast cells and hyphal filaments in the planktonic mode of growth. It also forms a three-dimensional biofilm structure in the host as well as on human catheter materials under suitable conditions. H3VCTG null (hht1/hht1) cells of C. albicans are viable but produce more robust biofilms than wild-type cells in both in vitro and in vivo conditions. Indeed, a comparative transcriptome analysis of planktonic and biofilm cells reveals that the biofilm circuitry is significantly altered in H3VCTG null cells. H3VCTG binds more efficiently to the promoters of many biofilm-related genes in the planktonic cells than during biofilm growth, whereas the binding of the core canonical histone H3 on the corresponding promoters largely remains unchanged. Furthermore, biofilm defects associated with master regulators, namely, biofilm and cell wall regulator 1 (Bcr1), transposon enhancement control 1 (Tec1), and non-dityrosine 80 (Ndt80), are significantly rescued in cells lacking H3VCTG. The occupancy of the transcription factor Bcr1 at its cognate promoter binding sites was found to be enhanced in the absence of H3VCTG in the planktonic form of growth resulting in enhanced transcription of biofilm-specific genes. Further, we demonstrate that co-occurrence of valine and serine at the 31st and 32nd positions in H3VCTG, respectively, is essential for its function. Taken together, we show that even in a unicellular organism, differential gene expression patterns are modulated by the relative occupancy of the specific histone H3 type at the chromatin level. A variant histone H3 specific to the CTG clade of ascomycete fungi modulates the expression of the majority of the biofilm genes in the human pathogen Candida albicans by binding differentially to biofilm-relevant gene promoters.
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Affiliation(s)
- Laxmi Shanker Rai
- Molecular Mycology Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
- Unité Biologie et Pathogénicité Fongiques, Institut Pasteur, USC2019 INRA, Paris, France
| | - Rima Singha
- Molecular Mycology Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
| | - Hiram Sanchez
- Department of Medicine, University of Wisconsin, Madison, Wisconsin, United States of America
| | - Tanmoy Chakraborty
- Molecular Mycology Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
| | - Bipin Chand
- Genotypic Technology Private Limited, Bangalore, India
| | | | - Shantanu Chowdhury
- GNR Center for Genome Informatics, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
- Proteomics and Structural Biology Unit, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
| | - Christophe d’Enfert
- Unité Biologie et Pathogénicité Fongiques, Institut Pasteur, USC2019 INRA, Paris, France
| | - David R. Andes
- Department of Medicine, University of Wisconsin, Madison, Wisconsin, United States of America
| | - Kaustuv Sanyal
- Molecular Mycology Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India
- * E-mail:
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Manfiolli AO, Dos Reis TF, de Assis LJ, de Castro PA, Silva LP, Hori JI, Walker LA, Munro CA, Rajendran R, Ramage G, Goldman GH. Mitogen activated protein kinases (MAPK) and protein phosphatases are involved in Aspergillus fumigatus adhesion and biofilm formation. Cell Surf 2018; 1:43-56. [PMID: 32743127 PMCID: PMC7389341 DOI: 10.1016/j.tcsw.2018.03.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 03/08/2018] [Accepted: 03/14/2018] [Indexed: 12/28/2022] Open
Abstract
The main characteristic of biofilm formation is extracellular matrix (ECM) production. The cells within the biofilm are surrounded by ECM which provides structural integrity and protection. During an infection, this protection is mainly against cells of the immune system and antifungal drugs. A. fumigatus forms biofilms during static growth on a solid substratum and in chronic aspergillosis infections. It is important to understand how, and which, A. fumigatus signal transduction pathways are important for the adhesion and biofilm formation in a host during infection. Here we investigated the role of MAP kinases and protein phosphatases in biofilm formation. The loss of the MAP kinases MpkA, MpkC and SakA had an impact on the cell surface and the ECM during biofilm formation and reduced the adherence of A. fumigatus to polystyrene and fibronectin-coated plates. The phosphatase null mutants ΔsitA and ΔptcB, involved in regulation of MpkA and SakA phosphorylation, influenced cell wall carbohydrate exposure. Moreover, we characterized the A. fumigatus protein phosphatase PphA. The ΔpphA strain was more sensitive to cell wall-damaging agents, had increased β-(1,3)-glucan and reduced chitin, decreased conidia phagocytosis by Dictyostelium discoideum and reduced adhesion and biofilm formation. Finally, ΔpphA strain was avirulent in a murine model of invasive pulmonary aspergillosis and increased the released of tumor necrosis factor alpha (TNF-α) from bone marrow derived macrophages (BMDMs). These results show that MAP kinases and phosphatases play an important role in signaling pathways that regulate the composition of the cell wall, extracellular matrix production as well as adhesion and biofilm formation in A. fumigatus.
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Affiliation(s)
- Adriana Oliveira Manfiolli
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Thaila Fernanda Dos Reis
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Leandro José de Assis
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Patrícia Alves de Castro
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Lilian Pereira Silva
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Juliana I Hori
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
| | - Louise A Walker
- School of Medical Sciences, University of Aberdeen, Aberdeen, UK
| | - Carol A Munro
- School of Medical Sciences, University of Aberdeen, Aberdeen, UK
| | - Ranjith Rajendran
- Infection and Immunity Research Group, Glasgow Dental School, School of Medicine, College of Medical, Veterinary and Life Sciences, The University of Glasgow, 378 Sauchiehall Street, Glasgow G2 3JZ, UK
| | - Gordon Ramage
- Infection and Immunity Research Group, Glasgow Dental School, School of Medicine, College of Medical, Veterinary and Life Sciences, The University of Glasgow, 378 Sauchiehall Street, Glasgow G2 3JZ, UK
| | - Gustavo H Goldman
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, Brazil
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Rossoni RD, de Barros PP, de Alvarenga JA, Ribeiro FDC, Velloso MDS, Fuchs BB, Mylonakis E, Jorge AOC, Junqueira JC. Antifungal activity of clinical Lactobacillus strains against Candida albicans biofilms: identification of potential probiotic candidates to prevent oral candidiasis. BIOFOULING 2018; 34:212-225. [PMID: 29380647 DOI: 10.1080/08927014.2018.1425402] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 01/03/2018] [Indexed: 06/07/2023]
Abstract
This study isolated Lactobacillus strains from caries-free subjects and evaluated the inhibitory effects directly on three strains of C. albicans, two clinical strains and one reference strain. Thirty Lactobacillus strains were isolated and evaluated for antimicrobial activity against in vitro C. albicans biofilms. L. paracasei 28.4, L. rhamnosus 5.2 and L. fermentum 20.4 isolates exhibited the most significant inhibitory activity against C. albicans. Co-incubation between these microorganisms resulted in deterrence of biofilm development and retardation of hyphal formation. The hindrance of biofilm development was characterized by the downregulated expression of C. albicans biofilm-specific genes (ALS3, HWP1, EFG1 and CPH1). L. paracasei 28.4, L. rhamnosus 5.2 and L. fermentum 20.4 demonstrated the ability to exert antifungal activity through the inhibition of C. albicans biofilms.
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Affiliation(s)
- Rodnei Dennis Rossoni
- a Department of Biosciences and Oral Diagnosis, Institute of Science and Technology , UNESP - Univ Estadual Paulista , Sao Jose dos Campos , Brazil
| | - Patrícia Pimentel de Barros
- a Department of Biosciences and Oral Diagnosis, Institute of Science and Technology , UNESP - Univ Estadual Paulista , Sao Jose dos Campos , Brazil
| | - Janaina Araújo de Alvarenga
- a Department of Biosciences and Oral Diagnosis, Institute of Science and Technology , UNESP - Univ Estadual Paulista , Sao Jose dos Campos , Brazil
| | - Felipe de Camargo Ribeiro
- a Department of Biosciences and Oral Diagnosis, Institute of Science and Technology , UNESP - Univ Estadual Paulista , Sao Jose dos Campos , Brazil
| | - Marisol Dos Santos Velloso
- a Department of Biosciences and Oral Diagnosis, Institute of Science and Technology , UNESP - Univ Estadual Paulista , Sao Jose dos Campos , Brazil
| | - Beth Burgwyn Fuchs
- b Division of Infectious Diseases , Rhode Island Hospital, Alpert Medical School of Brown University , Providence, RI , USA
| | - Eleftherios Mylonakis
- b Division of Infectious Diseases , Rhode Island Hospital, Alpert Medical School of Brown University , Providence, RI , USA
| | - Antonio Olavo Cardoso Jorge
- a Department of Biosciences and Oral Diagnosis, Institute of Science and Technology , UNESP - Univ Estadual Paulista , Sao Jose dos Campos , Brazil
| | - Juliana Campos Junqueira
- a Department of Biosciences and Oral Diagnosis, Institute of Science and Technology , UNESP - Univ Estadual Paulista , Sao Jose dos Campos , Brazil
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Rossi DCP, Gleason JE, Sanchez H, Schatzman SS, Culbertson EM, Johnson CJ, McNees CA, Coelho C, Nett JE, Andes DR, Cormack BP, Culotta VC. Candida albicans FRE8 encodes a member of the NADPH oxidase family that produces a burst of ROS during fungal morphogenesis. PLoS Pathog 2017; 13:e1006763. [PMID: 29194441 PMCID: PMC5728582 DOI: 10.1371/journal.ppat.1006763] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 12/13/2017] [Accepted: 11/20/2017] [Indexed: 12/30/2022] Open
Abstract
Until recently, NADPH oxidase (NOX) enzymes were thought to be a property of multicellularity, where the reactive oxygen species (ROS) produced by NOX acts in signaling processes or in attacking invading microbes through oxidative damage. We demonstrate here that the unicellular yeast and opportunistic fungal pathogen Candida albicans is capable of a ROS burst using a member of the NOX enzyme family, which we identify as Fre8. C. albicans can exist in either a unicellular yeast-like budding form or as filamentous multicellular hyphae or pseudohyphae, and the ROS burst of Fre8 begins as cells transition to the hyphal state. Fre8 is induced during hyphal morphogenesis and specifically produces ROS at the growing tip of the polarized cell. The superoxide dismutase Sod5 is co-induced with Fre8 and our findings are consistent with a model in which extracellular Sod5 acts as partner for Fre8, converting Fre8-derived superoxide to the diffusible H2O2 molecule. Mutants of fre8Δ/Δ exhibit a morphogenesis defect in vitro and are specifically impaired in development or maintenance of elongated hyphae, a defect that is rescued by exogenous sources of H2O2. A fre8Δ/Δ deficiency in hyphal development was similarly observed in vivo during C. albicans invasion of the kidney in a mouse model for disseminated candidiasis. Moreover C. albicans fre8Δ/Δ mutants showed defects in a rat catheter model for biofilms. Together these studies demonstrate that like multicellular organisms, C. albicans expresses NOX to produce ROS and this ROS helps drive fungal morphogenesis in the animal host. We demonstrate here that the opportunistic human fungal pathogen Candida albicans uses a NADPH oxidase enzyme (NOX) and reactive oxygen species (ROS) to control morphogenesis in an animal host. C. albicans was not previously known to express NOX enzymes as these were thought to be a property of multicellular organisms, not unicellular yeasts. We describe here the identification of C. albicans Fre8 as the first NOX enzyme that can produce extracellular ROS in a unicellular yeast. C. albicans can exist as either a unicellular yeast or as multicellular elongated hyphae, and Fre8 is specially expressed during transition to the hyphal state where it works to produce ROS at the growing tip of the polarized cell. C. albicans cells lacking Fre8 exhibit a deficiency in elongated hyphae during fungal invasion of the kidney in a mouse model for systemic candidiasis. Moreover, Fre8 is required for fungal survival in a rodent model for catheter biofilms. These findings implicate a role for fungal derived ROS in controlling morphogenesis of this important fungal pathogen for public health.
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Affiliation(s)
- Diego C. P. Rossi
- Department of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Julie E. Gleason
- Department of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Hiram Sanchez
- Departments of Medicine and of Medical Microbiology and Immunology, University of Wisconsin, Madison, Madison, Wisconsin, United States of America
| | - Sabrina S. Schatzman
- Department of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Edward M. Culbertson
- Department of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Chad J. Johnson
- Departments of Medicine and of Medical Microbiology and Immunology, University of Wisconsin, Madison, Madison, Wisconsin, United States of America
| | - Christopher A. McNees
- Department of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Carolina Coelho
- Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Jeniel E. Nett
- Departments of Medicine and of Medical Microbiology and Immunology, University of Wisconsin, Madison, Madison, Wisconsin, United States of America
| | - David R. Andes
- Departments of Medicine and of Medical Microbiology and Immunology, University of Wisconsin, Madison, Madison, Wisconsin, United States of America
| | - Brendan P. Cormack
- Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Valeria C. Culotta
- Department of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, United States of America
- * E-mail:
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Correia I, Alonso-Monge R, Pla J. The Hog1 MAP Kinase Promotes the Recovery from Cell Cycle Arrest Induced by Hydrogen Peroxide in Candida albicans. Front Microbiol 2017; 7:2133. [PMID: 28111572 PMCID: PMC5216027 DOI: 10.3389/fmicb.2016.02133] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Accepted: 12/19/2016] [Indexed: 11/27/2022] Open
Abstract
Eukaryotic cell cycle progression in response to environmental conditions is controlled via specific checkpoints. Signal transduction pathways mediated by MAPKs play a crucial role in sensing stress. For example, the canonical MAPKs Mkc1 (of the cell wall integrity pathway), and Hog1 (of the HOG pathway), are activated upon oxidative stress. In this work, we have analyzed the effect of oxidative stress induced by hydrogen peroxide on cell cycle progression in Candida albicans. Hydrogen peroxide was shown to induce a transient arrest at the G1 phase of the cell cycle. Specifically, a G1 arrest was observed, although phosphorylation of Mkc1 and Hog1 MAPKs can take place at all stages of the cell cycle. Interestingly, hog1 (but not mkc1) mutants required a longer time compared to wild type cells to resume growth after hydrogen peroxide challenge. Using GFP-labeled cells and mixed cultures of wild type and hog1 cells we were able to show that hog1 mutants progress faster through the cell cycle under standard growth conditions in the absence of stress (YPD at 37°C). Consequently, hog1 mutants exhibited a smaller cell size. The altered cell cycle progression correlates with altered expression of the G1 cyclins Cln3 and Pcl2 in hog1 cells compared to the wild type strain. In addition, Hgc1 (a hypha-specific G1 cyclin) as well as Cln3 displayed a different kinetics of expression in the presence of hydrogen peroxide in hog1 mutants. Collectively, these results indicate that Hog1 regulates the expression of G1 cyclins not only in response to oxidative stress, but also under standard growth conditions. Hydrogen peroxide treated cells did not show fluctuations in the mRNA levels for SOL1, which are observed in untreated cells during cell cycle progression. In addition, treatment with hydrogen peroxide prevented degradation of Sol1, an effect which was enhanced in hog1 mutants. Therefore, in C. albicans, the MAPK Hog1 mediates cell cycle progression in response to oxidative stress, and further participates in the cell size checkpoint during vegetative growth.
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Affiliation(s)
- Inês Correia
- Departamento de Microbiología II, Facultad de Farmacia, Universidad Complutense de Madrid Madrid, Spain
| | - Rebeca Alonso-Monge
- Departamento de Microbiología II, Facultad de Farmacia, Universidad Complutense de Madrid Madrid, Spain
| | - Jesús Pla
- Departamento de Microbiología II, Facultad de Farmacia, Universidad Complutense de Madrid Madrid, Spain
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Konstantinidou N, Morrissey JP. Co-occurence of filamentation defects and impaired biofilms in Candida albicans protein kinase mutants. FEMS Yeast Res 2015; 15:fov092. [PMID: 26472756 DOI: 10.1093/femsyr/fov092] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/10/2015] [Indexed: 12/21/2022] Open
Abstract
Pathogenicity of Candida albicans is linked with its developmental stages, notably the capacity switch from yeast-like to hyphal growth, and to form biofilms on surfaces. To better understand the cellular processes involved in C. albicans development, a collection of 63 C. albicans protein kinase mutants was screened for biofilm formation in a microtitre plate assay. Thirty-eight mutants displayed some degree of biofilm impairment, with 20 categorised as poor biofilm formers. All the poor biofilm formers were also defective in the switch from yeast to hyphae, establishing it as a primary defect. Five genes, VPS15, IME2, PKH3, PGA43 and CEX1, encode proteins not previously reported to influence hyphal development or biofilm formation. Network analysis established that individual components of some processes, most interestingly MAP kinase pathways, are not required for biofilm formation, most likely indicating functional redundancy. Mutants were also screened for their response to bacterial supernatants and it was found that Pseudomonas aeruginosa supernatants inhibited biofilm formation in all mutants, regardless of the presence of homoserine lactones (HSLs). In contrast, Candida morphology was only affected by supernatant containing HSLs. This confirms the distinct HSL-dependent inhibition of filamentation and the HSL-independent impairment of biofilm development by P. aeruginosa.
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Maiti P, Ghorai P, Ghosh S, Kamthan M, Tyagi RK, Datta A. Mapping of functional domains and characterization of the transcription factor Cph1 that mediate morphogenesis in Candida albicans. Fungal Genet Biol 2015; 83:45-57. [PMID: 26291891 DOI: 10.1016/j.fgb.2015.08.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 08/09/2015] [Accepted: 08/15/2015] [Indexed: 11/26/2022]
Abstract
Cph1, a transcription factor of the Mitogen Activated Protein (MAP) kinase pathway, regulates morphogenesis in human fungal pathogen Candida albicans. Here, by following a systemic deletion approach, we have identified functional domains and motifs of Cph1 that are involved in transcription factor activity and cellular morphogenesis. We found that the N-terminal homeodomain is essential for the DNA binding activity; however, C-terminal domain and polyglutamine motif (PQ) are indispensable for the transcriptional activation function. Complementation analysis of the cph1Δ null mutant using various deletion derivatives revealed functional significance of the N- and C-terminal domains and PQ motif in filamentation process, chlamydospore formation and sensitivity to the cell wall interfering compounds. Genome-wide identification of the Cph1 binding site and quantitative RT-PCR transcript analysis in cph1Δ null mutant revealed that a number of genes which are associated with the filamentous growth, maintaining cell wall organization and mitochondrial function, and the genes of the pH response pathway are the transcriptional targets of Cph1. The data also suggest that Cph1 may function as a positive or negative regulator depending on the morphological state and physiological conditions. Moreover, differential expression of the upstream MAP kinase pathway genes in wild type and cph1Δ null mutant indicated the existence of a feedback regulation.
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Affiliation(s)
- Protiti Maiti
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi 110067, India; National Institute of Plant Genome Research, New Delhi 110067, India
| | - Priyanka Ghorai
- National Institute of Plant Genome Research, New Delhi 110067, India
| | - Sumit Ghosh
- National Institute of Plant Genome Research, New Delhi 110067, India
| | - Mohan Kamthan
- National Institute of Plant Genome Research, New Delhi 110067, India
| | - Rakesh Kumar Tyagi
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi 110067, India.
| | - Asis Datta
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi 110067, India; National Institute of Plant Genome Research, New Delhi 110067, India.
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Abstract
Only few Candida species, e.g., Candida albicans, Candida glabrata, Candida dubliniensis, and Candida parapsilosis, are successful colonizers of a human host. Under certain circumstances these species can cause infections ranging from superficial to life-threatening disseminated candidiasis. The success of C. albicans, the most prevalent and best studied Candida species, as both commensal and human pathogen depends on its genetic, biochemical, and morphological flexibility which facilitates adaptation to a wide range of host niches. In addition, formation of biofilms provides additional protection from adverse environmental conditions. Furthermore, in many host niches Candida cells coexist with members of the human microbiome. The resulting fungal-bacterial interactions have a major influence on the success of C. albicans as commensal and also influence disease development and outcome. In this chapter, we review the current knowledge of important survival strategies of Candida spp., focusing on fundamental fitness and virulence traits of C. albicans.
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Affiliation(s)
- Melanie Polke
- Research Group Microbial Immunology, Hans-Knoell-Institute, Jena, Germany; Department Microbial Pathogenicity Mechanisms, Hans-Knoell-Institute, Jena, Germany
| | - Bernhard Hube
- Department Microbial Pathogenicity Mechanisms, Hans-Knoell-Institute, Jena, Germany; Friedrich-Schiller-University, Jena, Germany; Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany
| | - Ilse D Jacobsen
- Research Group Microbial Immunology, Hans-Knoell-Institute, Jena, Germany; Friedrich-Schiller-University, Jena, Germany
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Song Z, Shen L, Yin Y, Tan W, Shao C, Xu J, Wang Z. Role of two Nomuraea rileyi transmembrane sensors Sho1p and Sln1p in adaptation to stress due to changing culture conditions during microsclerotia development. World J Microbiol Biotechnol 2015; 31:477-85. [PMID: 25595731 DOI: 10.1007/s11274-015-1801-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 01/06/2015] [Indexed: 10/24/2022]
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Hogan D, Wheeler RT. The complex roles of NADPH oxidases in fungal infection. Cell Microbiol 2014; 16:1156-67. [PMID: 24905433 DOI: 10.1111/cmi.12320] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Revised: 05/27/2014] [Accepted: 05/29/2014] [Indexed: 12/21/2022]
Abstract
NADPH oxidases play key roles in immunity and inflammation that go beyond the production of microbicidal reactive oxygen species (ROS). The past decade has brought a new appreciation for the diversity of roles played by ROS in signalling associated with inflammation and immunity. NADPH oxidase activity affects disease outcome during infections by human pathogenic fungi, an important group of emerging and opportunistic pathogens that includes Candida, Aspergillus and Cryptococcus species. Here we review how alternative roles of NADPH oxidase activity impact fungal infection and how ROS signalling affects fungal physiology. Particular attention is paid to roles for NADPH oxidase in immune migration, immunoregulation in pulmonary infection, neutrophil extracellular trap formation, autophagy and inflammasome activity. These recent advances highlight the power and versatility of spatiotemporally controlled redox regulation in the context of infection, and point to a need to understand the molecular consequences of NADPH oxidase activity in the cell.
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Affiliation(s)
- Deborah Hogan
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA
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Jakab Á, Antal K, Kiss Á, Emri T, Pócsi I. Increased oxidative stress tolerance results in general stress tolerance in Candida albicans independently of stress-elicited morphological transitions. Folia Microbiol (Praha) 2014; 59:333-40. [PMID: 24477890 DOI: 10.1007/s12223-014-0305-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Accepted: 01/14/2014] [Indexed: 10/25/2022]
Abstract
A selection of tert-butylhydroperoxide (tBOOH)-tolerant Candida albicans mutants showed increased tolerances to 19 different stress conditions. These mutants are characterized by a constitutively upregulated antioxidative defense system and, therefore, adaptation to oxidative stress may play an important role in gaining general stress tolerance in C. albicans. Although C. albicans cells may undergo morphological transitions under various stress treatments, this ability shows considerable stress-specific and strain-specific variability and, hence, it is independent of mounting stress cross protections.
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Affiliation(s)
- Ágnes Jakab
- Department of Microbial Biotechnology and Cell Biology, Faculty of Science and Technology, University of Debrecen, P.O. Box 63, 4010, Debrecen, Hungary
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Low concentrations of hydrogen peroxide or nitrite induced of Paracoccidioides brasiliensis cell proliferation in a Ras-dependent manner. PLoS One 2013; 8:e69590. [PMID: 23922749 PMCID: PMC3726682 DOI: 10.1371/journal.pone.0069590] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2013] [Accepted: 06/10/2013] [Indexed: 01/27/2023] Open
Abstract
Paracoccidioides brasiliensis, a causative agent of paracoccidioidomycosis (PCM), should be able to adapt to dramatic environmental changes inside the infected host after inhalation of air-borne conidia and transition to pathogenic yeasts. Proteins with antioxidant functions may protect fungal cells against reactive oxygen (ROS) and nitrogen (RNS) species generated by phagocytic cells, thus acting as potential virulence factors. Ras GTPases are involved in stress responses, cell morphology, and differentiation in a range of organisms. Ras, in its activated form, interacts with effector proteins and can initiate a kinase cascade. In lower eukaryotes, Byr2 kinase represents a Ras target. The present study investigated the role of Ras in P. brasiliensis after in vitro stimulus with ROS or RNS. We have demonstrated that low concentrations of H2O2 (0.1 mM) or NO2 (0.1–0.25 µM) stimulated P. brasiliensis yeast cell proliferation and that was not observed when yeast cells were pre-incubated with farnesyltransferase inhibitor. We constructed an expression plasmid containing the Byr2 Ras-binding domain (RBD) fused with GST (RBD-Byr2-GST) to detect the Ras active form. After stimulation with low concentrations of H2O2 or NO2, the Ras active form was observed in fungal extracts. Besides, NO2 induced a rapid increase in S-nitrosylated Ras levels. This alternative posttranslational modification of Ras, probably in residue Cys123, would lead to an exchange of GDP for GTP and consequent GTPase activation in P. brasiliensis. In conclusion, low concentrations of H2O2 or NO2 stimulated P. brasiliensis proliferation through Ras activation.
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Song Z, Yin Y, Jiang S, Liu J, Chen H, Wang Z. Comparative transcriptome analysis of microsclerotia development in Nomuraea rileyi. BMC Genomics 2013; 14:411. [PMID: 23777366 PMCID: PMC3698084 DOI: 10.1186/1471-2164-14-411] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Accepted: 06/07/2013] [Indexed: 12/02/2022] Open
Abstract
Background Nomuraea rileyi is used as an environmental-friendly biopesticide. However, mass production and commercialization of this organism are limited due to its fastidious growth and sporulation requirements. When cultured in amended medium, we found that N. rileyi could produce microsclerotia bodies, replacing conidiophores as the infectious agent. However, little is known about the genes involved in microsclerotia development. In the present study, the transcriptomes were analyzed using next-generation sequencing technology to find the genes involved in microsclerotia development. Results A total of 4.69 Gb of clean nucleotides comprising 32,061 sequences was obtained, and 20,919 sequences were annotated (about 65%). Among the annotated sequences, only 5928 were annotated with 34 gene ontology (GO) functional categories, and 12,778 sequences were mapped to 165 pathways by searching against the Kyoto Encyclopedia of Genes and Genomes pathway (KEGG) database. Furthermore, we assessed the transcriptomic differences between cultures grown in minimal and amended medium. In total, 4808 sequences were found to be differentially expressed; 719 differentially expressed unigenes were assigned to 25 GO classes and 1888 differentially expressed unigenes were assigned to 161 KEGG pathways, including 25 enrichment pathways. Subsequently, we examined the up-regulation or uniquely expressed genes following amended medium treatment, which were also expressed on the enrichment pathway, and found that most of them participated in mediating oxidative stress homeostasis. To elucidate the role of oxidative stress in microsclerotia development, we analyzed the diversification of unigenes using quantitative reverse transcription-PCR (RT-qPCR). Conclusion Our findings suggest that oxidative stress occurs during microsclerotia development, along with a broad metabolic activity change. Our data provide the most comprehensive sequence resource available for the study of N. rileyi. We believe that the transcriptome datasets will serve as an important public information platform to accelerate studies on N. rileyi microsclerotia.
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Affiliation(s)
- Zhangyong Song
- Genetic Engineering Research Centre, School of Life Science, Chongqing University, Chongqing 400030, China
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Wright CJ, Burns LH, Jack AA, Back CR, Dutton LC, Nobbs AH, Lamont RJ, Jenkinson HF. Microbial interactions in building of communities. Mol Oral Microbiol 2013; 28:83-101. [PMID: 23253299 PMCID: PMC3600090 DOI: 10.1111/omi.12012] [Citation(s) in RCA: 130] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/31/2012] [Indexed: 12/31/2022]
Abstract
Establishment of a community is considered to be essential for microbial growth and survival in the human oral cavity. Biofilm communities have increased resilience to physical forces, antimicrobial agents and nutritional variations. Specific cell-to-cell adherence processes, mediated by adhesin-receptor pairings on respective microbial surfaces, are able to direct community development. These interactions co-localize species in mutually beneficial relationships, such as streptococci, veillonellae, Porphyromonas gingivalis and Candida albicans. In transition from the planktonic mode of growth to a biofilm community, microorganisms undergo major transcriptional and proteomic changes. These occur in response to sensing of diffusible signals, such as autoinducer molecules, and to contact with host tissues or other microbial cells. Underpinning many of these processes are intracellular phosphorylation events that regulate a large number of microbial interactions relevant to community formation and development.
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Affiliation(s)
- Christopher J. Wright
- Department of Oral Health and Systemic Disease, University of Louisville, 570 South Preston Street, Louisville, Kentucky, 40202, USA
| | - Logan H. Burns
- Department of Oral Health and Systemic Disease, University of Louisville, 570 South Preston Street, Louisville, Kentucky, 40202, USA
| | - Alison A. Jack
- School of Oral and Dental Sciences, University of Bristol, Lower Maudlin Street, Bristol BS12LY, UK
| | - Catherine R. Back
- School of Oral and Dental Sciences, University of Bristol, Lower Maudlin Street, Bristol BS12LY, UK
| | - Lindsay C. Dutton
- School of Oral and Dental Sciences, University of Bristol, Lower Maudlin Street, Bristol BS12LY, UK
| | - Angela H. Nobbs
- School of Oral and Dental Sciences, University of Bristol, Lower Maudlin Street, Bristol BS12LY, UK
| | - Richard J. Lamont
- Department of Oral Health and Systemic Disease, University of Louisville, 570 South Preston Street, Louisville, Kentucky, 40202, USA
| | - Howard F. Jenkinson
- School of Oral and Dental Sciences, University of Bristol, Lower Maudlin Street, Bristol BS12LY, UK
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Tsai PW, Chen YT, Hsu PC, Lan CY. Study of Candida albicans and its interactions with the host: A mini review. Biomedicine (Taipei) 2013. [DOI: 10.1016/j.biomed.2012.12.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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Chaves GM, Silva WPD. Superoxide dismutases and glutaredoxins have a distinct role in the response of Candida albicans to oxidative stress generated by the chemical compounds menadione and diamide. Mem Inst Oswaldo Cruz 2012; 107:998-1005. [DOI: 10.1590/s0074-02762012000800006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Accepted: 10/26/2012] [Indexed: 12/21/2022] Open
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Chang SH, Chung YS, Hwang SK, Kwon JT, Minai-Tehrani A, Kim S, Park SB, Kim YS, Cho MH. Lentiviral vector-mediated shRNA against AIMP2-DX2 suppresses lung cancer cell growth through blocking glucose uptake. Mol Cells 2012; 33:553-62. [PMID: 22562359 PMCID: PMC3887752 DOI: 10.1007/s10059-012-2269-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2011] [Revised: 03/20/2012] [Accepted: 03/22/2012] [Indexed: 01/19/2023] Open
Abstract
Aminoacyl-tRNA synthetases [ARS]-interacting multifunctional protein 2 (AIMP2) has been implicated in the control of cell fate and lung cell differentiation. A variant of AIMP2 lacking exon 2 (AIMP2-DX2) is expressed in different cancer cells. We previously studied the expression level of AIMP2-DX2 in several lung cell lines and reported elevated expression levels of AIMP2-DX2 in NCI-H460 and NCI-H520. Here, we report that the suppression of AIMP2-DX2 by lentivirus mediated short hairpin (sh)RNA (sh-DX2) decreased the rate of glucose uptake and glucose transporters (Gluts) in NCI-H460 cells. Down-regulation of AIMP2-DX2 reduced glycosyltransferase (GnT)-V in the Golgi apparatus, while inducing the GnT-V antagonist GnT-III. Down-regulation of AIMP2-DX2 also suppressed the epidermal growth factor receptor/mitogen activated protein kinase (EGFR/MAPK) signaling pathway, leading to the decrease of the proliferation marker Ki-67 expression in nuclei. Furthermore, dual luciferase activity reduced capdependent protein translation in cells infected with sh-DX2. These results suggest that AIMP2-DX2 may be a relevant therapeutic target for lung cancer, and that the sh-DX2 lentiviral system can be an appropriate method for lung cancer therapy.
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Affiliation(s)
- Seung-Hee Chang
- Laboratory of Toxicology, College of Veterinary Medicine, Seoul National University, Seoul 151-742,
Korea
| | - Youn-Sun Chung
- Laboratory of Toxicology, College of Veterinary Medicine, Seoul National University, Seoul 151-742,
Korea
| | - Soon-Kyung Hwang
- Gene Regulation Section, Laboratory of Cancer Prevention, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702,
USA
| | - Jung-Taek Kwon
- Laboratory of Toxicology, College of Veterinary Medicine, Seoul National University, Seoul 151-742,
Korea
- Risk Assessment Division, National Institute of Environmental Research, Incheon 404-708,
Korea
| | - Arash Minai-Tehrani
- Laboratory of Toxicology, College of Veterinary Medicine, Seoul National University, Seoul 151-742,
Korea
| | - Sunghoon Kim
- Medicinal Bioconvergence Research Center, Seoul National University, Seoul 151-742,
Korea
| | - Seung Bum Park
- Department of Chemistry, College of National Science, Seoul National University, Seoul 151-742,
Korea
| | - Yeon-Soo Kim
- Department of Smart Foods and Drugs and Indang Institute of Molecular Biology, Inje University, Seoul 100-032,
Korea
| | - Myung-Haing Cho
- Laboratory of Toxicology, College of Veterinary Medicine, Seoul National University, Seoul 151-742,
Korea
- Department of Nanofusion Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151-742,
Korea
- Graduate Group of Tumor Biology, Seoul National University, Seoul 151-742,
Korea
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