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Tavvabi-Kashani N, Hasanpour M, Baradaran Rahimi V, Vahdati-Mashhadian N, Askari VR. Pharmacodynamic, pharmacokinetic, toxicity, and recent advances in Eugenol's potential benefits against natural and chemical noxious agents: A mechanistic review. Toxicon 2024; 238:107607. [PMID: 38191032 DOI: 10.1016/j.toxicon.2024.107607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 01/03/2024] [Indexed: 01/10/2024]
Abstract
The active biological phytochemicals, crucial compounds employed in creating hundreds of medications, are derived from valuable and medicinally significant plants. These phytochemicals offer excellent protection from various illnesses, including inflammatory disorders and chronic conditions caused by oxidative stress. A phenolic monoterpenoid known as eugenol (EUG), it is typically found in the essential oils of many plant species from the Myristicaceae, Myrtaceae, Lamiaceae, and Lauraceae families. One of the main ingredients of clove oil (Syzygium aromaticum (L.), Myrtaceae), it has several applications in industry, including flavoring food, pharmaceutics, dentistry, agriculture, and cosmeceuticals. Due to its excellent potential for avoiding many chronic illnesses, it has lately attracted attention. EUG has been classified as a nonmutant, generally acknowledged as a safe (GRAS) chemical by the World Health Organization (WHO). According to the existing research, EUG possesses notable anti-inflammatory, antioxidant, analgesic, antibacterial, antispasmodic, and apoptosis-promoting properties, which have lately gained attention for its ability to control chronic inflammation, oxidative stress, and mitochondrial malfunction and dramatically impact human wellness. The purpose of this review is to evaluate the scientific evidence from the most significant research studies that have been published regarding the protective role and detoxifying effects of EUG against a wide range of toxins, including biological and chemical toxins, as well as different drugs and pesticides that produce a variety of toxicities, throughout view of the possible advantages of EUG.
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Affiliation(s)
- Negin Tavvabi-Kashani
- Student Research Committee, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran; Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Maede Hasanpour
- Department of Pharmacognosy and Medicinal Plants Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Vafa Baradaran Rahimi
- Pharmacological Research Center of Medicinal Plants, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Cardiovascular Diseases, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Naser Vahdati-Mashhadian
- Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Vahid Reza Askari
- Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, Iran; Pharmacological Research Center of Medicinal Plants, Mashhad University of Medical Sciences, Mashhad, Iran.
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Ocaña-Ortega A, Pérez-Flores G, Torres-Tirado D, Pérez-García LA. O-Linked Glycans of Candida albicans Interact with Specific GPCRs in the Coronary Endothelium and Inhibit the Cardiac Response to Agonists. J Fungi (Basel) 2023; 9:jof9020141. [PMID: 36836256 PMCID: PMC9960525 DOI: 10.3390/jof9020141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 01/17/2023] [Accepted: 01/18/2023] [Indexed: 01/22/2023] Open
Abstract
Candida albicans is an opportunistic fungal pathogen that may cause invasive infections in immunocompromised patients, disseminating through the bloodstream to other organs. In the heart, the initial step prior to invasion is the adhesion of the fungus to endothelial cells. Being the fungal cell wall's outermost structure and the first to come in contact with host cells, it greatly modulates the interplay that later will derive in the colonization of the host tissue. In this work, we studied the functional contribution of N-linked and O-linked mannans of the cell wall of C. albicans to the interaction with the coronary endothelium. An isolated rat heart model was used to assess cardiac parameters related to vascular and inotropic effects in response to phenylephrine (Phe), acetylcholine (aCh) and angiotensin II (Ang II) when treatments consisting of: (1) live and heat-killed (HK) C. albicans wild-type yeasts; (2) live C. albicans pmr1Δ yeasts (displaying shorter N-linked and O-linked mannans); (3) live C. albicans without N-linked and O-linked mannans; and (4) isolated N-linked and O-linked mannans were administered to the heart. Our results showed that C. albicans WT alters heart coronary perfusion pressure (vascular effect) and left ventricular pressure (inotropic effect) parameters in response to Phe and Ang II but not aCh, and these effects can be reversed by mannose. Similar results were observed when isolated cell walls, live C. albicans without N-linked mannans or isolated O-linked mannans were perfused into the heart. In contrast, C. albicans HK, C. albicans pmr1Δ, C. albicans without O-linked mannans or isolated N-linked mannans were not able to alter the CPP and LVP in response to the same agonists. Taken together, our data suggest that C. albicans interaction occurs with specific receptors on coronary endothelium and that O-linked mannan contributes to a greater extent to this interaction. Further studies are necessary to elucidate why specific receptors preferentially interact with this fungal cell wall structure.
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Smith DFQ, Mudrak NJ, Zamith-Miranda D, Honorato L, Nimrichter L, Chrissian C, Smith B, Gerfen G, Stark RE, Nosanchuk JD, Casadevall A. Melanization of Candida auris Is Associated with Alteration of Extracellular pH. J Fungi (Basel) 2022; 8:1068. [PMID: 36294632 PMCID: PMC9604884 DOI: 10.3390/jof8101068] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 10/05/2022] [Accepted: 10/07/2022] [Indexed: 11/29/2022] Open
Abstract
Candida auris is a recently emerged global fungal pathogen, which causes life-threatening infections, often in healthcare settings. C. auris infections are worrisome because the fungus is often resistant to multiple antifungal drug classes. Furthermore, C. auris forms durable and difficult to remove biofilms. Due to the relatively recent, resilient, and resistant nature of C. auris, we investigated whether it produces the common fungal virulence factor melanin. Melanin is a black-brown pigment typically produced following enzymatic oxidation of aromatic precursors, which promotes fungal virulence through oxidative stress resistance, mammalian immune response evasion, and antifungal peptide and pharmaceutical inactivation. We found that certain strains of C. auris oxidized L-DOPA and catecholamines into melanin. Melanization occurred extracellularly in a process mediated by alkalinization of the extracellular environment, resulting in granule-like structures that adhere to the fungus' external surface. C. auris had relatively high cell surface hydrophobicity, but there was no correlation between hydrophobicity and melanization. Melanin protected the fungus from oxidative damage, but we did not observe a protective role during infection of macrophages or Galleria mellonella larvae. In summary, C. auris alkalinizes the extracellular medium, which promotes the non-enzymatic oxidation of L-DOPA to melanin that attaches to its surface, thus illustrating a novel mechanism for fungal melanization.
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Affiliation(s)
- Daniel F. Q. Smith
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
| | - Nathan J. Mudrak
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
- Krieger School of Arts & Science, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Daniel Zamith-Miranda
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA
- Division of Infectious Diseases, Department of Medicine, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA
| | - Leandro Honorato
- Laboratório de Glicobiologia de Eucariotos, Departamento de Microbiologia Geral, Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-901, Brazil
| | - Leonardo Nimrichter
- Laboratório de Glicobiologia de Eucariotos, Departamento de Microbiologia Geral, Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-901, Brazil
| | - Christine Chrissian
- Department of Chemistry and Biochemistry, City College of New York and CUNY Institute for Macromolecular Assemblies, The City University of New York, New York, NY 10031, USA
| | - Barbara Smith
- Institute for Basic Biomedical Sciences Microscope Facility, The Johns Hopkins School of Medicine, Baltimore, MD 21205, USA
| | - Gary Gerfen
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA
| | - Ruth E. Stark
- Department of Chemistry and Biochemistry, City College of New York and CUNY Institute for Macromolecular Assemblies, The City University of New York, New York, NY 10031, USA
| | - Joshua D. Nosanchuk
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA
- Division of Infectious Diseases, Department of Medicine, Albert Einstein College of Medicine, Bronx, New York, NY 10461, USA
| | - Arturo Casadevall
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
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Smith DFQ, Casadevall A. On the relationship between Pathogenic Potential and Infective Inoculum. PLoS Pathog 2022; 18:e1010484. [PMID: 35696437 PMCID: PMC9232127 DOI: 10.1371/journal.ppat.1010484] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 06/24/2022] [Accepted: 05/16/2022] [Indexed: 11/18/2022] Open
Abstract
Pathogenic Potential (PP) is a mathematical description of an individual microbe, virus, or parasite's ability to cause disease in a host, given the variables of inoculum, signs of disease, mortality, and in some instances, median survival time of the host. We investigated the relationship between pathogenic potential (PP) and infective inoculum (I) using two pathogenic fungi in the wax moth Galleria mellonella with mortality as the relevant outcome. Our analysis for C. neoformans infection revealed negative exponential relationship between PP and I. Plotting the log(I) versus the Fraction of animals with signs or symptoms (Fs) over median host survival time (T) revealed a linear relationship, with a slope that varied between the different fungi studied and a y-intercept corresponding to the inoculum that produced no signs of disease. The I vs Fs/T slope provided a measure of the pathogenicity of each microbial species, which we call the pathogenicity constant or kPath. The kPath provides a new parameter to quantitatively compare the relative virulence and pathogenicity of microbial species for a given host. In addition, we investigated the PP and Fs/T from values found in preexisting literature. Overall, the relationship between Fs/T and PP versus inoculum varied among microbial species and extrapolation to zero signs of disease allowed the calculation of the lowest pathogenic inoculum (LPI) of a microbe. Microbes tended to fall into two groups: those with positive linear relationships between PP and Fs/T vs I, and those that had a negative exponential PP vs I relationship with a positive logarithmic Fs/T vs I relationship. The microbes with linear relationships tended to be bacteria, whereas the exponential-based relationships tended to be fungi or higher order eukaryotes. Differences in the type and sign of the PP vs I and Fs/T vs I relationships for pathogenic microbes suggest fundamental differences in host-microbe interactions leading to disease.
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Affiliation(s)
- Daniel F. Q. Smith
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Arturo Casadevall
- W. Harry Feinstone Department of Molecular Microbiology and Immunology, The Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
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Ravine TJ, Soltani M, Davis JH, Salter EA, Wierzbicki A. Unusual Boronium Salt Shows Antifungal Activity Comparable to a Commercial Quaternary Ammonium Disinfectant. ChemistrySelect 2022. [DOI: 10.1002/slct.202104344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Terrence J. Ravine
- Department of Biomedical Sciences University of South Alabama 5721 USA Drive North Mobile AL 36688
| | - Mohammad Soltani
- Department of Chemistry University of South Alabama 6040 USA South Drive Mobile AL 36688
| | - James H. Davis
- Department of Chemistry University of South Alabama 6040 USA South Drive Mobile AL 36688
| | - Edward A. Salter
- Department of Chemistry University of South Alabama 6040 USA South Drive Mobile AL 36688
| | - Andrzej Wierzbicki
- Department of Chemistry University of South Alabama 6040 USA South Drive Mobile AL 36688
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Di Cosola M, Cazzolla AP, Charitos IA, Ballini A, Inchingolo F, Santacroce L. Candida albicans and Oral Carcinogenesis. A Brief Review. J Fungi (Basel) 2021; 7:jof7060476. [PMID: 34204731 PMCID: PMC8231483 DOI: 10.3390/jof7060476] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 06/02/2021] [Accepted: 06/09/2021] [Indexed: 12/14/2022] Open
Abstract
Current medical knowledge and research on patients’ management are still evolving, and several protocols on minimizing risk of infection by Candida spp. among the population have developed. The aim of this work is to review the epidemiological and biomolecular characteristics and the various histopathological carcinogenesis hypothesis mechanisms that can occur during Candida albicans infections. Current evidence from the literature on the role of C. albicans during potentially malignant oral disorders and oral cancer has been sought. Thus, these biomolecular processes can give or contribute to benign lesions, also in precancerous or cancerous situations. Alongside this, the physiological microorganism oral flora (microbiota) can play a crucial role in maintaining oral health during those infections and therefore avoid carcinogenesis.
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Affiliation(s)
- Michele Di Cosola
- Department of Clinical and Experimental Medicine, Università degli Studi di Foggia, 71122 Foggia, Italy; (M.D.C.); (A.P.C.)
| | - Angela Pia Cazzolla
- Department of Clinical and Experimental Medicine, Università degli Studi di Foggia, 71122 Foggia, Italy; (M.D.C.); (A.P.C.)
| | - Ioannis Alexandros Charitos
- Department of Emergency and Urgency, National Poisoning Centre, Riuniti University Hospital of Foggia, 71122 Foggia, Italy
- Correspondence: (I.A.C.); (A.B.)
| | - Andrea Ballini
- Department of Biosciences, Biotechnologies and Biopharmaceutics, Campus Universitario Ernesto Quagliariello, University of Bari “Aldo Moro”, 70125 Bari, Italy
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro” School of Medicine, 70124 Bari, Italy; (F.I.); (L.S.)
- Correspondence: (I.A.C.); (A.B.)
| | - Francesco Inchingolo
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro” School of Medicine, 70124 Bari, Italy; (F.I.); (L.S.)
| | - Luigi Santacroce
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro” School of Medicine, 70124 Bari, Italy; (F.I.); (L.S.)
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7
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Li T, Li L, Du F, Sun L, Shi J, Long M, Chen Z. Activity and Mechanism of Action of Antifungal Peptides from Microorganisms: A Review. Molecules 2021; 26:molecules26113438. [PMID: 34198909 PMCID: PMC8201221 DOI: 10.3390/molecules26113438] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/01/2021] [Accepted: 06/03/2021] [Indexed: 12/20/2022] Open
Abstract
Harmful fungi in nature not only cause diseases in plants, but also fungal infection and poisoning when people and animals eat food derived from crops contaminated with them. Unfortunately, such fungi are becoming increasingly more resistant to traditional synthetic antifungal drugs, which can make prevention and control work increasingly more difficult to achieve. This means they are potentially very harmful to human health and lifestyle. Antifungal peptides are natural substances produced by organisms to defend themselves against harmful fungi. As a result, they have become an important research object to help deal with harmful fungi and overcome their drug resistance. Moreover, they are expected to be developed into new therapeutic drugs against drug-resistant fungi in clinical application. This review focuses on antifungal peptides that have been isolated from bacteria, fungi, and other microorganisms to date. Their antifungal activity and factors affecting it are outlined in terms of their antibacterial spectra and effects. The toxic effects of the antifungal peptides and their common solutions are mentioned. The mechanisms of action of the antifungal peptides are described according to their action pathways. The work provides a useful reference for further clinical research and the development of safe antifungal drugs that have high efficiencies and broad application spectra.
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Affiliation(s)
- Tianxi Li
- College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China; (T.L.); (L.L.); (F.D.)
| | - Lulu Li
- College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China; (T.L.); (L.L.); (F.D.)
| | - Fangyuan Du
- College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China; (T.L.); (L.L.); (F.D.)
| | - Lei Sun
- College of Animal Husbandry and Veterinary Medicine, Jinzhou Medical University, Jinzhou 121001, China;
| | - Jichao Shi
- Liaoning Agricultural Development Service Center, Shenyang 110032, China;
| | - Miao Long
- College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China; (T.L.); (L.L.); (F.D.)
- Correspondence: (M.L.); (Z.C.)
| | - Zeliang Chen
- College of Animal Science & Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China; (T.L.); (L.L.); (F.D.)
- Correspondence: (M.L.); (Z.C.)
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8
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de Oliveira SAM, Reis JN, Catão E, Amaral AC, Souza ACO, Ribeiro AM, Faccioli LH, Carneiro FP, Marina CLF, Bürgel PH, Fernandes L, Tavares AH, Bocca AL. β2 Integrin-Mediated Susceptibility to Paracoccidioides brasiliensis Experimental Infection in Mice. Front Cell Infect Microbiol 2021; 11:622899. [PMID: 33796477 PMCID: PMC8007971 DOI: 10.3389/fcimb.2021.622899] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 01/25/2021] [Indexed: 11/13/2022] Open
Abstract
The earliest interaction between macrophages and Paracoccidioides brasiliensis is particularly important in paracoccidioidomycosis (PCM) progression, and surface proteins play a central role in this process. The present study investigated the contribution of β2 integrin in P. brasiliensis-macrophage interaction and PCM progression. We infected β2-low expression (CD18low) and wild type (WT) mice with P. brasiliensis 18. Disease progression was evaluated for fungal burden, lung granulomatous lesions, nitrate levels, and serum antibody production. Besides, the in vitro capacity of macrophages to internalize and kill fungal yeasts was investigated. Our results revealed that CD18low mice infected with Pb18 survived during the time analyzed; their lungs showed fewer granulomas, a lower fungal load, lower levels of nitrate, and production of high levels of IgG1 in comparison to WT animals. Our results revealed that in vitro macrophages from CD18low mice slowly internalized yeast cells, showing a lower fungal burden compared to WT cells. The migration capacity of macrophages was compromised and showed a higher intensity in the lysosome signal when compared with WT mice. Our data suggest that β2 integrins play an important role in fungal survival inside macrophages, and once phagocytosed, the macrophage may serve as a protective environment for P. brasiliensis.
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Affiliation(s)
- Stephan Alberto Machado de Oliveira
- Molecular Pathology Graduation Course, Faculty of Medicine, University of Brasilia, Brasilia, Brazil.,Department of Cell Biology, Institute of Biological Sciences, University of Brasilia, Brasilia, Brazil
| | - Janayna Nunes Reis
- Molecular Pathology Graduation Course, Faculty of Medicine, University of Brasilia, Brasilia, Brazil
| | - Elisa Catão
- Department of Cell Biology, Institute of Biological Sciences, University of Brasilia, Brasilia, Brazil
| | - Andre Correa Amaral
- Institute of Tropical Pathology and Public Health, Federal University of Goiás, Goiania, Brazil
| | - Ana Camila Oliveira Souza
- Molecular Pathology Graduation Course, Faculty of Medicine, University of Brasilia, Brasilia, Brazil
| | - Alice Melo Ribeiro
- Department of Cell Biology, Institute of Biological Sciences, University of Brasilia, Brasilia, Brazil
| | - Lúcia Helena Faccioli
- Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | | | - Clara Luna Freitas Marina
- Molecular Biology Graduation Course, Institute of Biological Sciences, University of Brasilia, Brasilia, Brazil
| | - Pedro Henrique Bürgel
- Molecular Biology Graduation Course, Institute of Biological Sciences, University of Brasilia, Brasilia, Brazil
| | | | | | - Anamelia Lorenzetti Bocca
- Molecular Pathology Graduation Course, Faculty of Medicine, University of Brasilia, Brasilia, Brazil.,Department of Cell Biology, Institute of Biological Sciences, University of Brasilia, Brasilia, Brazil.,Molecular Biology Graduation Course, Institute of Biological Sciences, University of Brasilia, Brasilia, Brazil
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9
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Interaction of Styrylpyridinium Compound with Pathogenic Candida albicans Yeasts and Human Embryonic Kidney HEK-293 Cells. Microorganisms 2020; 9:microorganisms9010048. [PMID: 33375480 PMCID: PMC7823387 DOI: 10.3390/microorganisms9010048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/21/2020] [Accepted: 12/22/2020] [Indexed: 12/26/2022] Open
Abstract
Candida albicans-caused local and systemic diseases are a serious health issue worldwide, leading to high mycosis-associated morbidity and mortality. Efficient combinations of novel compounds with commonly used antifungals could be an important tool for fighting infections. The aim of this study was to evaluate the interaction of synthesized 4-(4-cyanostyryl)-1-dodecylpyridin-1-ium (CSDP+) bromide alone or in combination with fluconazole with yeast and mammalian cells. We investigated cytotoxicity of the tested agents to mammalian HEK-293 cells and the influence of CSDP+ on the ability of C. albicans wt and a clinical isolate to adhere to HEK-293. Accumulation of lipophilic cation ethidium (Et+) was used to monitor the activity of efflux pumps in HEK-293 cells. The effect of CSDP+ on the expression of the main efflux transporter genes and transcription factors in C.albicans cells as well as HEK-293 efflux pump gene ABCB1 was determined. The study showed that CSDP+ alone and in combination with fluconazole was nontoxic to HEK-293 cells and was able to reduce C.albicans adhesion. The treatment of C.albicans cells with CSDP+ in combination with fluconazole resulted in a considerable overexpression of the MDR1 and MRR1 genes. The findings suggest that these genes could be associated with efflux-related resistance to fluconazole. Measurements of Et+ fluorescence and analysis of ABCB1 gene expression demonstrated that mammalian cells were not sensitive to concentrations of CSDP+ affecting C. albicans.
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10
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Lukácsi S, Mácsik-Valent B, Nagy-Baló Z, Kovács KG, Kliment K, Bajtay Z, Erdei A. Utilization of complement receptors in immune cell-microbe interaction. FEBS Lett 2020; 594:2695-2713. [PMID: 31989596 DOI: 10.1002/1873-3468.13743] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/15/2020] [Accepted: 01/16/2020] [Indexed: 12/19/2022]
Abstract
The complement system is a major humoral component of immunity and is essential for the fast elimination of pathogens invading the body. In addition to its indispensable role in innate immunity, the complement system is also involved in pathogen clearance during the effector phase of adaptive immunity. The fastest way of killing the invader is lysis by the membrane attack complex, which is formed by the terminal components of the complement cascade. Not all pathogens are lysed however and, if opsonized by a variety of molecules, they undergo phagocytosis and disposal inside immune cells. The most important complement-derived opsonins are C1q, the first component of the classical pathway, MBL, the initiator of the lectin pathway and C3-derived activation fragments, including C3b, iC3b and C3d, which all serve as ligands for their corresponding receptors. In this review, we discuss how complement receptors are utilized by various immune cells to tackle invading microbes, or by pathogens to evade host response.
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Affiliation(s)
- Szilvia Lukácsi
- MTA-ELTE Immunology Research Group, Eötvös Loránd University, Budapest, Hungary
| | | | - Zsuzsa Nagy-Baló
- Department of Immunology, Eötvös Loránd University, Budapest, Hungary
| | - Kristóf G Kovács
- Department of Immunology, Eötvös Loránd University, Budapest, Hungary
| | | | - Zsuzsa Bajtay
- MTA-ELTE Immunology Research Group, Eötvös Loránd University, Budapest, Hungary.,Department of Immunology, Eötvös Loránd University, Budapest, Hungary
| | - Anna Erdei
- MTA-ELTE Immunology Research Group, Eötvös Loránd University, Budapest, Hungary.,Department of Immunology, Eötvös Loránd University, Budapest, Hungary
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11
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Bhagat YS, Bhat RS, Kolekar RM, Patil AC, Lingaraju S, Patil RV, Udikeri SS. Remusatia vivipara lectin and Sclerotium rolfsii lectin interfere with the development and gall formation activity of Meloidogyne incognita in transgenic tomato. Transgenic Res 2019; 28:299-315. [PMID: 30868351 DOI: 10.1007/s11248-019-00121-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 03/11/2019] [Indexed: 11/24/2022]
Abstract
Root knot nematodes are serious threats to growth and yield of solaneous crops including tomato. In this study, a binary vector carrying Remusatia vivipara (rvl1) and Sclerotium rolfsii (srl1) lectin genes were introduced independently into Lycopersicon esculentum cv. Pusa Ruby via Agrobacterium tumefaciens for resistance against root knot nematode, Meloidogyne incognita. In total, one hundred and one rvl1 and srl1-transformed plants exhibiting kanamycin resistance were confirmed to carry transgenes as detected by polymerase chain reaction (PCR) with 4.59% transformation efficiency. Genetic analysis of T1 progeny confirmed Mendelian segregation of the introduced genes. Three events each of rvl1 and srl1 transgenic tomato were randomly selected for further confirmation by Southern and TAIL-PCR analyses. All three events of srl1 transgenics showed single copy transgene, whereas two rvl1 transgenic events showed single copy of transgene, while remaining event showed two copies of transgenes. Site of integration obtained for rvl1 and srl1 transgenic events by TAIL-PCR revealed that all the three events of rvl1 and srl1 transgenics differed for their site of integration and insertion sites did not contain any predicted gene. Moreover, expression of the rvl1 and srl1 transgenes was detected by haemagglutination assay in all three events of rvl1 and srl1, but not in non-transgenic tomato plant. Homozygous progenies of these events were grown and inoculated with M. incognita. Development and reproduction of M. incognita was severely affected in transgenic tomato plants expressing RVL1 and SRL1 exhibiting the high levels of resistance compared to non-transgenic plants. Therefore, these transgenic lines demonstrate a promising potential for variety development of tomato lines with enhanced resistance against M. incognita.
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Affiliation(s)
- Yogesh S Bhagat
- Department of Biotechnology, College of Agriculture, University of Agricultural Sciences, Dharwad, Dharwad, 580005, India.
| | - Ramesh S Bhat
- Department of Biotechnology, College of Agriculture, University of Agricultural Sciences, Dharwad, Dharwad, 580005, India
| | - Rohini M Kolekar
- Department of Biotechnology, College of Agriculture, University of Agricultural Sciences, Dharwad, Dharwad, 580005, India
| | - Ashlesha C Patil
- Department of Biotechnology, College of Agriculture, University of Agricultural Sciences, Bangalore, Bengaluru, 560065, India
| | - S Lingaraju
- Insititute of Organic Farming, University of Agricultural Sciences, Dharwad, Dharwad, 580005, India
| | - R V Patil
- Department of Horticulture, College of Agriculture, Bijapur, University of Agricultural Sciences, Dharwad, 586103, India
| | - S S Udikeri
- Agriculture Research Station, Dharwad Farm, University of Agricultural Sciences, Dharwad, Dharwad, 580005, India
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12
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An overview of lectin–glycan interactions: a key event in initiating fungal infection and pathogenesis. Arch Microbiol 2018; 200:371-382. [DOI: 10.1007/s00203-018-1487-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 09/01/2017] [Accepted: 01/30/2018] [Indexed: 01/16/2023]
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13
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Influence of serum and polystyrene plate type on stability of Candida albicans biofilms. J Microbiol Methods 2017; 139:8-11. [DOI: 10.1016/j.mimet.2017.04.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 04/17/2017] [Accepted: 04/19/2017] [Indexed: 11/24/2022]
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14
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Detection of Multidrug-Resistant Fungal Infections in Cancer Patients. Fungal Biol 2017. [DOI: 10.1007/978-3-319-34106-4_16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Sfihi-Loualia G, Hurtaux T, Fabre E, Fradin C, Mée A, Pourcelot M, Maes E, Bouckaert J, Mallet JM, Poulain D, Delplace F, Guérardel Y. Candida albicans β-1,2-mannosyltransferase Bmt3 prompts the elongation of the cell-wall phosphopeptidomannan. Glycobiology 2015; 26:203-14. [PMID: 26525402 DOI: 10.1093/glycob/cwv094] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 10/26/2015] [Indexed: 01/06/2023] Open
Abstract
β-1,2-Linked mannosides are expressed on numerous cell-wall glycoconjugates of the opportunistic pathogen yeast Candida albicans. Several studies evidenced their implication in the host-pathogen interaction and virulence mechanisms. In the present study, we characterized the in vitro activity of CaBmt3, a β-1,2-mannosyltransferase involved in the elongation of β-1,2-oligomannosides oligomers onto the cell-wall polymannosylated N-glycans. A recombinant soluble enzyme Bmt3p was produced in Pichia pastoris and its enzyme activity was investigated using natural and synthetic oligomannosides as potential acceptor substrates. Bmt3p was shown to exhibit an exquisite enzymatic specificity by adding a single terminal β-mannosyl residue to α-1,2-linked oligomannosides capped by a Manβ1-2Man motif. Furthermore, we demonstrated that the previously identified CaBmt1 and CaBmt3 efficiently act together to generate Manβ1-2Manβ1-2[Manα1-2]n sequence from α-1,2-linked oligomannosides onto exogenous and endogenous substrates.
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Affiliation(s)
- Ghenima Sfihi-Loualia
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F 59000 Lille, France
| | - Thomas Hurtaux
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F 59000 Lille, France
| | - Emeline Fabre
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F 59000 Lille, France
| | - Chantal Fradin
- Univ. Lille, Inserm, CHU Lille, U995 - LIRIC - Lille Inflammation Research International Center, F-59000 Lille, France
| | - Anaïs Mée
- École Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités - UPMC Univ Paris 06, CNRS UMR 7203 LBM, 24, rue Lhomond, 75005 Paris, France
| | - Marilyne Pourcelot
- École Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités - UPMC Univ Paris 06, CNRS UMR 7203 LBM, 24, rue Lhomond, 75005 Paris, France
| | - Emmanuel Maes
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F 59000 Lille, France
| | - Julie Bouckaert
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F 59000 Lille, France
| | - Jean-Maurice Mallet
- École Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités - UPMC Univ Paris 06, CNRS UMR 7203 LBM, 24, rue Lhomond, 75005 Paris, France
| | - Daniel Poulain
- Univ. Lille, Inserm, CHU Lille, U995 - LIRIC - Lille Inflammation Research International Center, F-59000 Lille, France
| | - Florence Delplace
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F 59000 Lille, France
| | - Yann Guérardel
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F 59000 Lille, France
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16
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Krasowska A, Sigler K. How microorganisms use hydrophobicity and what does this mean for human needs? Front Cell Infect Microbiol 2014; 4:112. [PMID: 25191645 PMCID: PMC4137226 DOI: 10.3389/fcimb.2014.00112] [Citation(s) in RCA: 306] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Accepted: 07/29/2014] [Indexed: 11/25/2022] Open
Abstract
Cell surface hydrophobicity (CSH) plays a crucial role in the attachment to, or detachment from the surfaces. The influence of CSH on adhesion of microorganisms to biotic and abiotic surfaces in medicine as well as in bioremediation and fermentation industry has both negative and positive aspects. Hydrophobic microorganisms cause the damage of surfaces by biofilm formation; on the other hand, they can readily accumulate on organic pollutants and decompose them. Hydrophilic microorganisms also play a considerable role in removing organic wastes from the environment because of their high resistance to hydrophobic chemicals. Despite the many studies on the environmental and metabolic factors affecting CSH, the knowledge of this subject is still scanty and is in most cases limited to observing the impact of hydrophobicity on adhesion, aggregation or flocculation. The future of research seems to lie in finding a way to managing the microbial adhesion process, perhaps by steering cell hydrophobicity.
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Affiliation(s)
- Anna Krasowska
- Department of Biotransformation, Faculty of Biotechnology, University of Wroclaw Wroclaw, Poland
| | - Karel Sigler
- Department of Cell Biology, Institute of Microbiology, Czech Academy of Sciences Prague, Czech Republic
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17
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Kulikov SN, Lisovskaya SA, Zelenikhin PV, Bezrodnykh EA, Shakirova DR, Blagodatskikh IV, Tikhonov VE. Antifungal activity of oligochitosans (short chain chitosans) against some Candida species and clinical isolates of Candida albicans: molecular weight-activity relationship. Eur J Med Chem 2013; 74:169-78. [PMID: 24462847 DOI: 10.1016/j.ejmech.2013.12.017] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 12/13/2013] [Accepted: 12/18/2013] [Indexed: 10/25/2022]
Abstract
A series of oligochitosans (short chain chitosans) prepared by acidic hydrolysis of chitosan and characterized by their molecular weight, polydispersity and degree of deacetylation were used to determine their anticandidal activities. This study has demonstrated that oligochitosans show a high fungistatic activity (MIC 8-512 μg/ml) against Candida species and clinical isolates of Candida albicans, which are resistant to a series of classic antibiotics. Flow cytometry analysis showed that oligochitosan possessed a high fungicidal activity as well. For the first time it was shown that even sub-MIC oligochitosan concentration suppressed the formation of C. albicans hyphal structures, cause severe cell wall alterations, and altered internal cell structure. These results indicate that oligochitosan should be considered as a possible alternative/additive to known anti-yeast agents in pharmaceutical compositions.
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Affiliation(s)
- Sergey N Kulikov
- Kazan Scientific Research Institute of Epidemiology and Microbiology, Bolshaya Krasnaya St. 67, Kazan 420015, Russia
| | - Svetlana A Lisovskaya
- Kazan Scientific Research Institute of Epidemiology and Microbiology, Bolshaya Krasnaya St. 67, Kazan 420015, Russia
| | | | - Evgeniya A Bezrodnykh
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia
| | - Diana R Shakirova
- Kazan Federal University, Kremlyovskaya St. 18, Kazan 420008, Russia
| | - Inesa V Blagodatskikh
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia
| | - Vladimir E Tikhonov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, Moscow 119991, Russia.
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18
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Miyakawa Y. [Molecular biological approach to screening essential genes as potential targets for antifungal targets in pathogenic yeast Candida]. Med Mycol J 2013; 54:117-22. [PMID: 23760075 DOI: 10.3314/mmj.54.117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We established a system, named ETS system, for screening and identification of essential genes from the pathogenic haploid yeast Candida glabrata by using temperature-sensitive (ts) mutants. Based on the general concepts that ts mutations are generated within essential genes in the genome by virtue of point mutation, the ETS system enabled us to screen and identify a variety of essential genes from the C. glabrata genomic DNA library as the genes that complement ts mutations. The ETS system established in the present study may provide novel potential antifungal targets.
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Affiliation(s)
- Yozo Miyakawa
- Division of Biotechnology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
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19
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Ali AA, Alharbi FA, Suresh CS. Effectiveness of coating acrylic resin dentures on preventing Candida adhesion. J Prosthodont 2013; 22:445-50. [PMID: 23711356 DOI: 10.1111/jopr.12046] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/19/2012] [Indexed: 11/27/2022] Open
Abstract
PURPOSE The aim of this study was to prevent the adhesion of C. albicans on acrylic resin dentures by modifying their surfaces. MATERIALS AND METHODS Ninety acrylic resin plates were divided into three groups. Group I: conventionally processed acrylic resin plates. Group II: plates painted with 2-Octyl Cyanoacrylate adhesive. Group III: plates painted with Adper Single Bond Adhesive. All specimens were immersed separately in containers filled with artificial saliva that contained C. albicans and then incubated for 11 days at 37°C. Three methods of evaluation were used to count the adhered Candida: direct culture, slide count, and serial dilutions. RESULTS C. albicans in 1/10, 1/10², and 1/10³ dilutions showed overgrowth in group I, while overgrowth was noted only with 1/10 dilution in group III. For group III, mean colony numbers of 123, 22, 3.4, and 0 were found for the 1/10², 1/10³, 1/10⁴, and 1/10⁵ dilutions, respectively. Regarding the slide counts, group I showed a mean fungal count of 166 compared to 40 for group III with 1/10 dilution, 21 compared to 9 with 1/10³ dilution, 8.6 compared to 0.7 with 1/10³ dilution, and 1.2 compared to 0 with 1/10⁴ dilution. No plates in group II showed any candidal colonies regardless of the method of evaluation (0%). These differences were statistically significant (p < 0.0001). CONCLUSION Coating the acrylic resin dentures with Adper Single Bond Adhesive was effective in reducing C. albicans adhesion to dentures, while coating with 2-Octyl Cyanoacrylate adhesive completely inhibited such adhesion.
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Affiliation(s)
- Aiman A Ali
- Department of Biomedical Dental Sciences, College of Dentistry, University of Dammam, Saudi Arabia.
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20
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Varghese N, Yang S, Sejwal P, Luk YY. Surface control of blastospore attachment and ligand-mediated hyphae adhesion of Candida albicans. Chem Commun (Camb) 2013; 49:10418-20. [DOI: 10.1039/c3cc45945d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Controlling the adhesion of Candida albicans on surfaces by the selected ligand deconvolutes effects from multiple adhesins and nonspecific interactions.
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Affiliation(s)
- Nisha Varghese
- Department of Chemistry
- Department of Biomedical and Chemical Engineering
- Syracuse Biomaterials Institute
- Syracuse University
- Syracuse
| | - Sijie Yang
- Department of Chemistry
- Department of Biomedical and Chemical Engineering
- Syracuse Biomaterials Institute
- Syracuse University
- Syracuse
| | - Preeti Sejwal
- Department of Chemistry
- Department of Biomedical and Chemical Engineering
- Syracuse Biomaterials Institute
- Syracuse University
- Syracuse
| | - Yan-Yeung Luk
- Department of Chemistry
- Department of Biomedical and Chemical Engineering
- Syracuse Biomaterials Institute
- Syracuse University
- Syracuse
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21
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Kabir MA, Hussain MA, Ahmad Z. Candida albicans: A Model Organism for Studying Fungal Pathogens. ISRN MICROBIOLOGY 2012; 2012:538694. [PMID: 23762753 PMCID: PMC3671685 DOI: 10.5402/2012/538694] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2012] [Accepted: 08/30/2012] [Indexed: 01/12/2023]
Abstract
Candida albicans is an opportunistic human fungal pathogen that causes candidiasis. As healthcare has been improved worldwide, the number of immunocompromised patients has been increased to a greater extent and they are highly susceptible to various pathogenic microbes and C. albicans has been prominent among the fungal pathogens. The complete genome sequence of this pathogen is now available and has been extremely useful for the identification of repertoire of genes present in this pathogen. The major challenge is now to assign the functions to these genes of which 13% are specific to C. albicans. Due to its close relationship with yeast Saccharomyces cerevisiae, an edge over other fungal pathogens because most of the technologies can be directly transferred to C. albicans from S. cerevisiae and it is amenable to mutation, gene disruption, and transformation. The last two decades have witnessed enormous amount of research activities on this pathogen that leads to the understanding of host-parasite interaction, infections, and disease propagation. Clearly, C. albicans has emerged as a model organism for studying fungal pathogens along with other two fungi Aspergillus fumigatus and Cryptococcus neoformans. Understanding its complete life style of C. albicans will undoubtedly be useful for developing potential antifungal drugs and tackling Candida infections. This will also shed light on the functioning of other fungal pathogens.
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Affiliation(s)
- M Anaul Kabir
- Molecular Genetics Laboratory, School of Biotechnology, National Institute of Technology Calicut, Calicut 673601, Kerala, India
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22
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Everest-Dass AV, Jin D, Thaysen-Andersen M, Nevalainen H, Kolarich D, Packer NH. Comparative structural analysis of the glycosylation of salivary and buccal cell proteins: innate protection against infection by Candida albicans. Glycobiology 2012; 22:1465-79. [DOI: 10.1093/glycob/cws112] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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23
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Jawhara S, Mogensen E, Maggiotto F, Fradin C, Sarazin A, Dubuquoy L, Maes E, Guérardel Y, Janbon G, Poulain D. Murine model of dextran sulfate sodium-induced colitis reveals Candida glabrata virulence and contribution of β-mannosyltransferases. J Biol Chem 2012; 287:11313-24. [PMID: 22291009 DOI: 10.1074/jbc.m111.329300] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Candida glabrata, like Candida albicans, is an opportunistic yeast pathogen that has adapted to colonize all segments of the human gastrointestinal tract and vagina. The C. albicans cell wall expresses β-1,2-linked mannosides (β-Mans), promoting its adherence to host cells and tissues. Because β-Mans are also present in C. glabrata, their role in C. glabrata colonization and virulence was investigated in a murine model of dextran sulfate sodium (DSS)-induced colitis. Five clustered genes of C. glabrata encoding β-mannosyltransferases, BMT2-BMT6, were deleted simultaneously. β-Man expression was studied by Western blotting, flow cytometry, and NMR analysis. Mortality, clinical, histologic, and colonization scores were determined in mice receiving DSS and different C. glabrata strains. The results show that C. glabrata bmt2-6 strains had a significant reduction in β-1,2-Man expression and a disappearance of β-1,2-mannobiose in the acid-stable domain. A single gavage of C. glabrata wild-type strain in mice with DSS-induced colitis caused a loss of body weight, colonic inflammation, and mortality. Mice receiving C. glabrata bmt2-6 mutant strains had normal body weight and reduced colonic inflammation. Lower numbers of colonies of C. glabrata bmt2-6 were recovered from stools and different parts of the gastrointestinal tract. Histopathologic examination revealed that the wild-type strain had a greater ability to colonize tissue and cause tissue damage. These results showed that C. glabrata has a high pathogenic potential in DSS-induced colitis, where β-Mans contribute to colonization and virulence.
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Affiliation(s)
- Samir Jawhara
- Université Lille Nord de France, 59000 Lille, France.
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24
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van der Nest MA, Steenkamp ET, Slippers B, Mongae A, van Zyl K, Stenlid J, Wingfield MJ, Wingfield BD. Gene expression associated with vegetative incompatibility in Amylostereum areolatum. Fungal Genet Biol 2011; 48:1034-43. [PMID: 21889597 DOI: 10.1016/j.fgb.2011.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2011] [Revised: 08/11/2011] [Accepted: 08/15/2011] [Indexed: 12/23/2022]
Abstract
In filamentous fungi, vegetative compatibility among individuals of the same species is determined by the genes encoded at the heterokaryon incompatibility (het) loci. The hyphae of genetically similar individuals that share the same allelic specificities at their het loci are able to fuse and intermingle, while different allelic specificities at the het loci result in cell death of the interacting hyphae. In this study, suppression subtractive hybridization (SSH) followed by pyrosequencing and quantitative reverse transcription PCR were used to identify genes that are selectively expressed when vegetatively incompatible individuals of Amylostereum areolatum interact. The SSH library contained genes associated with various cellular processes, including cell-cell adhesion, stress and defence responses, as well as cell death. Some of the transcripts encoded proteins that were previously implicated in the stress and defence responses associated with vegetative incompatibility. Other transcripts encoded proteins known to be associated with programmed cell death, but have not previously been linked with vegetative incompatibility. Results of this study have considerably increased our knowledge of the processes underlying vegetative incompatibility in Basidiomycetes in general and A. areolatum in particular.
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Affiliation(s)
- M A van der Nest
- Department of Genetics, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria 0002, South Africa
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25
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Candida and invasive candidiasis: back to basics. Eur J Clin Microbiol Infect Dis 2011; 31:21-31. [PMID: 21544694 DOI: 10.1007/s10096-011-1273-3] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2010] [Accepted: 04/12/2011] [Indexed: 10/18/2022]
Abstract
The ubiquitous Candida spp. is an opportunistic fungal pathogen which, despite treatment with antifungal drugs, can cause fatal bloodstream infections (BSIs) in immunocompromised and immunodeficient persons. Thus far, several major C. albicans virulence factors have been relatively well studied, including morphology switching and secreted degradative enzymes. However, the exact mechanism of Candida pathogenesis and the host response to invasion are still not well elucidated. The relatively recent discovery of the quorum-sensing molecule farnesol and the existence of quorum sensing as a basic regulatory phenomenon of the C. albicans population behavior has revolutionized Candida research. Through population density regulation, the quorum-sensing mechanism also controls the cellular morphology of a C. albicans population in response to environmental factors, thereby, effectively placing morphology switching downstream of quorum sensing. Thus, the quorum-sensing phenomenon has been hailed as the 'missing piece' of the pathogenicity puzzle. Here, we review what is known about Candida spp. as the etiological agents of invasive candidiasis and address our current understanding of the quorum-sensing phenomenon in relation to virulence in the host.
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27
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Inhibition of Virulence Factors of Candida spp. by Different Surfactants. Mycopathologia 2010; 171:93-101. [DOI: 10.1007/s11046-010-9351-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2009] [Accepted: 07/20/2010] [Indexed: 01/09/2023]
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28
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Sulzenbacher G, Roig-Zamboni V, Peumans WJ, Rougé P, Van Damme EJ, Bourne Y. Crystal structure of the GalNAc/Gal-specific agglutinin from the phytopathogenic ascomycete Sclerotinia sclerotiorum reveals novel adaptation of a beta-trefoil domain. J Mol Biol 2010; 400:715-23. [PMID: 20566411 PMCID: PMC2956877 DOI: 10.1016/j.jmb.2010.05.038] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Accepted: 05/12/2010] [Indexed: 10/19/2022]
Abstract
A lectin from the phytopathogenic ascomycete Sclerotinia sclerotiorum that shares only weak sequence similarity with characterized fungal lectins has recently been identified. S. sclerotiorum agglutinin (SSA) is a homodimeric protein consisting of two identical subunits of approximately 17 kDa and displays specificity primarily towards Gal/GalNAc. Glycan array screening indicates that SSA readily interacts with Gal/GalNAc-bearing glycan chains. The crystal structures of SSA in the ligand-free form and in complex with the Gal-beta1,3-GalNAc (T-antigen) disaccharide have been determined at 1.6 and 1.97 A resolution, respectively. SSA adopts a beta-trefoil domain as previously identified for other carbohydrate-binding proteins of the ricin B-like lectin superfamily and accommodates terminal non-reducing galactosyl and N-acetylgalactosaminyl glycans. Unlike other structurally related lectins, SSA contains a single carbohydrate-binding site at site alpha. SSA reveals a novel dimeric assembly markedly dissimilar to those described earlier for ricin-type lectins. The present structure exemplifies the adaptability of the beta-trefoil domain in the evolution of fungal lectins.
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Affiliation(s)
- Gerlind Sulzenbacher
- Architecture et Fonction des Macromolécules Biologiques (AFMB, UMR-6098) CNRS, Université Aix-Marseille, Campus Luminy, Case 932, F-13288 Marseille cedex 09, France
| | - Véronique Roig-Zamboni
- Architecture et Fonction des Macromolécules Biologiques (AFMB, UMR-6098) CNRS, Université Aix-Marseille, Campus Luminy, Case 932, F-13288 Marseille cedex 09, France
| | - Willy J. Peumans
- Laboratory of Biochemistry and Glycobiology, Department of Molecular Biotechnology, Ghent University, Coupure Links 653, Ghent, Belgium
| | - Pierre Rougé
- Surfaces Cellulaires et Signalisation chez les Végétaux, UMR-CNRS 5546, Pôle de Biotechnologie Végétale, Toulouse, France
| | - Els J.M. Van Damme
- Laboratory of Biochemistry and Glycobiology, Department of Molecular Biotechnology, Ghent University, Coupure Links 653, Ghent, Belgium
| | - Yves Bourne
- Architecture et Fonction des Macromolécules Biologiques (AFMB, UMR-6098) CNRS, Université Aix-Marseille, Campus Luminy, Case 932, F-13288 Marseille cedex 09, France
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Kempf M, Cottin J, Licznar P, Lefrançois C, Robert R, Apaire-Marchais V. Disruption of the GPI protein-encoding gene IFF4 of Candida albicans results in decreased adherence and virulence. Mycopathologia 2009; 168:73-7. [PMID: 19347602 DOI: 10.1007/s11046-009-9201-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Accepted: 03/24/2009] [Indexed: 01/23/2023]
Abstract
Candida albicans is the most important cause of systemic fungal infection in immunocompromised humans. Candidiasis is often initiated by the adherence and the colonization of inert surfaces such as peripheral venous catheters, central catheters, prosthetic cardiac valves, and other prostheses. We have studied the early stage of adherence and have shown that the disruption of C. albicans IFF4 gene encoding a GPI-anchor protein, led to a decrease of adherence of the germ tubes to plastic. Here, we demonstrated the role of the IFF4 gene in adherence to silicone catheter, as well as in virulence using a murine model of disseminated candidiasis. The iff4 Delta null mutant showed both a decrease of adherence to silicone catheter and a reduction of virulence. This work presents evidence for the importance of the IFF4 gene in host-fungal interaction.
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Affiliation(s)
- Marie Kempf
- Groupe d'Etude des Interactions Hôte-Pathogène, UPRES EA 3142, UFR des Sciences Pharmaceutiques et d'Ingénierie de la Santé, 16 Bd Daviers, 49045, Angers Cedex, France.
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30
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Park SE, Blissett R, Susarla SM, Weber HP. Candida albicansAdherence to Surface-Modified Denture Resin Surfaces. J Prosthodont 2008; 17:365-9. [DOI: 10.1111/j.1532-849x.2007.00292.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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31
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ZENG XIN, XIONG CHUNRONG, WANG ZHI, JIANG LU, HOU XIAOHUI, SHEN JUN, ZHOU MIN, CHEN QIANMING. Genotypic profiles and virulence attributes of Candida albicans isolates from patients with oral lichen planus. APMIS 2008; 116:284-91. [DOI: 10.1111/j.1600-0463.2008.00741.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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32
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Braga PC, Sasso MD, Culici M, Alfieri M. Eugenol and thymol, alone or in combination, induce morphological alterations in the envelope of Candida albicans. Fitoterapia 2007; 78:396-400. [PMID: 17590533 DOI: 10.1016/j.fitote.2007.02.022] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2006] [Accepted: 02/05/2007] [Indexed: 11/25/2022]
Abstract
The envelope of Candida albicans, with its outermost array of macromolecules protruding towards the environment, is pivotal to the expression of major virulence factors such as adhesiveness, and the morphological transition to hyphal form. We tested the anticandidal activity of eugenol, main component of clove oil, and thymol, main component of thyme oil, alone or in combination, by investigating their ability to interfere with the architecture of the envelope of C. albicans. Both molecules alterated the morphogenesis of the envelope, but the effects of thymol were more pronounced than those of eugenol. Certain combinations of the two molecules led to a synergistic effect, which is interesting in the view of potentiating their inhibition of C. albicans colonisation and infectiousness.
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Affiliation(s)
- P C Braga
- Department of Pharmacology, School of Medicine, University of Milano, Milano, Italy.
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Aroonrerk N, Dhanesuan N. Candida inhibitory effects of six commercial mouthwashes. ANN MICROBIOL 2007. [DOI: 10.1007/bf03175088] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Ozkutuk A, Dogan Y, Kirdar S, Ozkutuk N. Changes in some Candida albicans virulence factors due to amphotericin-B post-antifungal effect. J Chemother 2007; 19:101-3. [PMID: 17309860 DOI: 10.1179/joc.2007.19.1.101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Affiliation(s)
- A Ozkutuk
- Dokuz Eylul University School of Medicine, Department of Microbiology and Clinical Microbiology, 35340 Inciraltilzmir, Turkey.
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Herrero M, Navarro R, Grohens Y, Reinecke H, Mijangos C. Controlled wet-chemical modification and bacterial adhesion on PVC-surfaces. Polym Degrad Stab 2006. [DOI: 10.1016/j.polymdegradstab.2006.02.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ribeiro EL, Scroferneker ML, Cavalhaes MS, Campos CC, Nagato GM, Souza NA, Ferreira WM, Cardoso CG, Dias SMS, Pimenta FC, Toledo OA. Phenotypic aspects of oral strains of Candida albicans in children with down's syndrome. BRAZ J BIOL 2006; 66:939-44. [PMID: 17119842 DOI: 10.1590/s1519-69842006000500020] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2005] [Accepted: 04/11/2005] [Indexed: 11/22/2022] Open
Abstract
The aim of this article is to characterize the biological aspects of oral strains of C. albicans in children with Down's syndrome. These yeasts were analyzed as to their macromorphological and enzymatic aspects and were tested as to their in vitro susceptibility to antifungal drugs using broth microdilution to determine the minimum inhibitory concentration (MIC). The morphotyping revealed that all oral C. albicans isolates from children with Down's syndrome promoted the formation of fringes regardless of size, while the control group presented smaller fringes. All oral C. albicans strains produced proteinase, but those with phospholipolytic activity showed greater enzyme capacity in the test group. In vitro susceptibility showed that all oral C. albicans isolates were sensitive to the drugs used.
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Affiliation(s)
- E L Ribeiro
- Institute of Tropical Pathology and Public Health, Universidade Federal de Goiás, Goiânia, GO, Brazil.
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Taweechaisupapong S, Klanrit P, Singhara S, Pitiphat W, Wongkham S. Inhibitory effect of Streblus asper leaf-extract on adhesion of Candida albicans to denture acrylic. JOURNAL OF ETHNOPHARMACOLOGY 2006; 106:414-7. [PMID: 16529890 DOI: 10.1016/j.jep.2006.01.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2005] [Revised: 01/15/2006] [Accepted: 01/28/2006] [Indexed: 05/07/2023]
Abstract
This in vitro study aimed at determining the effects of various sublethal concentrations of Streblus asper leaf ethanolic extract (SAE) on adherence of Candida albicans to acrylic surface. A colorimetric tetrazolium assay using (2,3)-bis (2-methoxy-4-nitro-5-sulfophenyl)-5-[(phenylamino)-carbonyl]-2H-tetrazolium hydroxide was used to make the quantitative determination. The SAE at a concentration equivalent to nystatin (6.24microg/ml) pinpointed the minimal exposure time of SAE in suppressing candidal adhesion to acrylic. Adhesion of Candida albicans to acrylic was determined after exposure to SAE for 1, 15, 30, 60, 120 and 180min. The minimum concentration of SAE that significantly reduced adherence (P<0.05) after a 4-h exposure was 31.25mg/ml. In addition, a significant reduction (P<0.01) of candidal adhesion to acrylic occurred after a 1min exposure to 62.5mg/ml of SAE. Pre-treatment of yeast with 62.5mg/ml of SAE for 1h before adhesion assay significant reduced the adherence as 20.54% compared to the untreated control, whereas the same treatment with acrylic strips did not show any effect. These findings indicate that exposure of Candida albicans to sublethal concentrations of SAE results in a reduction in the ability of the yeasts to adhere to denture acrylic, possibly preventative of denture stomatitis.
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Affiliation(s)
- S Taweechaisupapong
- Department of Oral Diagnosis, Faculty of Dentistry, Khon Kaen University, Khon Kaen 40002, Thailand.
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He XY, Meurman JH, Kari K, Rautemaa R, Samaranayake LP. In vitro adhesion of Candida species to denture base materials. Mycoses 2006; 49:80-4. [PMID: 16466438 DOI: 10.1111/j.1439-0507.2006.01189.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Adhesion of Candida species to prosthetic acrylic resins is an essential first step in the pathogenesis of denture stomatitis. Data on the relative adhesion of pathogenic non-albicans Candida species to different denture base materials are sparse. The purpose of the present study was to investigate in vitro adhesion of C. albicans, C. glabrata, C. krusei and C. dubliniensis to four different denture base materials. Specimens of both heat-cured resins (Vertex(TM) Rapid Simplified and ProBase Hot) and cold-cured resins (Paladur A and Paladur B) were prepared using a novel method and the adhesion of four strains each of the foregoing Candida species evaluated microscopically using a soft imaging system. There was a significant difference in yeast adherence between Vertex and the other resins. Only C. glabrata attached to Vertex, while all the remainder of the tested species adhered to all other resins tested except ProBase, which resisted C. krusei adhesion. There was a significant difference in candidal adhesion between cold-cured and heat-cured resins for three Candida species (C. albicans, P = 0.039; C. glabrata, P = 0.002 and C. krusei, P = 0.000). The type of denture base material and whether they are heat-cured or cold-cured play an important role in modifying candidal adhesion.
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Affiliation(s)
- X Y He
- Institute of Dentistry, University of Helsinki and Helsinki University Central Hospital, Helsinki, Finland.
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Adt I, Toubas D, Pinon JM, Manfait M, Sockalingum GD. FTIR spectroscopy as a potential tool to analyse structural modifications during morphogenesis of Candida albicans. Arch Microbiol 2006; 185:277-85. [PMID: 16474951 DOI: 10.1007/s00203-006-0094-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2005] [Revised: 09/27/2005] [Accepted: 01/24/2006] [Indexed: 11/26/2022]
Abstract
Candida albicans is a polymorphic organism that grows under certain conditions as blastospores, hyphae or pseudohyphae. The potentials of FTIR spectroscopy for assessing structural differences in C. albicans blastospores and hyphae were investigated. The main observed differences were localised in the polysaccharide (950-1,185 cm(-1)), protein (1,480-1,720 cm(-1)), and the fatty acids (2,840-3,000 cm(-1)) regions. Quantitative evaluation of differences between hyphae and blastospores by curve-fitting of these regions indicate that these modifications could be due to both changes in structure and content of components of the cell wall such as beta-glucans, mannoproteins, and lipids. Furthermore, glycogen consumption could be involved during hyphae elongation. Thus, FTIR spectroscopy can be an interesting tool to investigate differences in structure and in content between blastospores and hyphae. We also demonstrate through this study that differentiation of C. albicans clinical strains using hyphae is feasible, as this has been previously shown with blastospores. This preliminary work on identification of C. albicans using hyphae is a prelude to a larger clinical study for early typing within 7 h from a pure culture.
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Affiliation(s)
- Isabelle Adt
- Unité MéDIAN CNRS UMR 6142, UFR Pharmacie, IFR 53, Université de Reims Champagne-Ardenne, 51 rue Cognacq-Jay, 51096, Reims CEDEX, France
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Tanida T, Okamoto T, Ueta E, Yamamoto T, Osaki T. Antimicrobial peptides enhance the candidacidal activity of antifungal drugs by promoting the efflux of ATP from Candida cells. J Antimicrob Chemother 2005; 57:94-103. [PMID: 16291868 DOI: 10.1093/jac/dki402] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES To establish a novel strategy of fungal infection control. METHODS We examined the influences of antimicrobial peptides including a synthesized short lactoferrin peptide (FKCRRWQWRM, Peptide 2; Pep2) on the synthesis of Candida cell wall polysaccharides, ergosterol synthesis, membrane permeability and the efflux of ATP. RESULTS Colony formation of Candida albicans was synergistically suppressed by a combination of low concentrations of each drug and peptide. All peptides and amphotericin B, but not itraconazole, revealed weak inhibitory activities against ergosterol synthesis and the peptides weakly suppressed the synthesis of Candida cell wall components, glucan, mannan and chitin. Cell membrane permeability was not only increased by these peptides but also clearly increased by both amphotericin B and itraconazole. ATP efflux was however up-regulated by low concentrations of the peptides, especially by Pep2 and Hst5, although both antifungal drugs did not exert any influence on ATP efflux. The expression of the Candida drug resistance genes 1 and 2 (CDR1 and CDR2) was increased by both drugs, but this increase was suppressed by each peptide. In addition, larger amounts of amphotericin B and itraconazole remained in Candida cells in the presence of Pep2 or Hst5 due to the lower excretion. The effects of both peptides on ATP efflux and increase of intercellular amphotericin B and itraconazole were blocked by anion channel inhibitors 4,4'-diisothiocyanatestilbene-2, 2'-disulphonic acid and 5-nitro-2-(3-phenylpropylamino) benzoic acid. CONCLUSIONS The examined peptides, especially Pep2 and Hst5, enhance the candidacidal activity of antifungal drugs by promoting anion channel-associated ATP efflux from Candida cells and decreasing efflux of the drugs, which could be useful clinical applications.
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Affiliation(s)
- Toyohiro Tanida
- Department of Oral Oncology, Kochi Medical School, Kochi University, Kohasu, Oko-cho, Nankoku-city, Kochi 783-8505, Japan
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Mendes-Giannini MJS, Soares CP, da Silva JLM, Andreotti PF. Interaction of pathogenic fungi with host cells: Molecular and cellular approaches. ACTA ACUST UNITED AC 2005; 45:383-94. [PMID: 16087326 DOI: 10.1016/j.femsim.2005.05.014] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2005] [Accepted: 05/27/2005] [Indexed: 11/26/2022]
Abstract
This review provides an overview of several molecular and cellular approaches that are likely to supply insights into the host-fungus interaction. Fungi present intra- and/or extracellular host-parasite interfaces, the parasitism phenomenon being dependent on complementary surface molecules. The entry of the pathogen into the host cell is initiated by the fungus adhering to the cell surface, which generates an uptake signal that may induce its cytoplasmatic internalization. Furthermore, microbial pathogens use a variety of their surface molecules to bind to host extracellular matrix (ECM) components to establish an effective infection. On the other hand, integrins mediate the tight adhesion of cells to the ECM at sites referred to as focal adhesions and also play a role in cell signaling. The phosphorylation process is an important mechanism of cell signaling and regulation; it has been implicated recently in defense strategies against a variety of pathogens that alter host-signaling pathways in order to facilitate their invasion and survival within host cells. The study of signal transduction pathways in virulent fungi is especially important in view of their putative role in the regulation of pathogenicity. This review discusses fungal adherence, changes in cytoskeletal organization and signal transduction in relation to host-fungus interaction.
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Bates S, Hughes HB, Munro CA, Thomas WPH, MacCallum DM, Bertram G, Atrih A, Ferguson MAJ, Brown AJP, Odds FC, Gow NAR. Outer chain N-glycans are required for cell wall integrity and virulence of Candida albicans. J Biol Chem 2005; 281:90-8. [PMID: 16263704 DOI: 10.1074/jbc.m510360200] [Citation(s) in RCA: 186] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The outer layer of the Candida albicans cell wall is enriched in highly glycosylated mannoproteins that are the immediate point of contact with the host and strongly influence the host-fungal interaction. N-Glycans are the major form of mannoprotein modification and consist of a core structure, common to all eukaryotes, that is further elaborated in the Golgi to form the highly branched outer chain that is characteristic of fungi. In yeasts, outer chain branching is initiated by the action of the alpha1,6-mannosyltransferase Och1p; therefore, we disrupted the C. albicans OCH1 homolog to determine the importance of outer chain N-glycans on the host-fungal interaction. Loss of CaOCH1 resulted in a temperature-sensitive growth defect and cellular aggregation. Outer chain elongation of N-glycans was absent in the null mutant, demonstrated by the lack of the alpha1,6-linked polymannose backbone and the underglycosylation of N-acetylglucosaminidase. A null mutant lacking OCH1 was hypersensitive to a range of cell wall perturbing agents and had a constitutively activated cell wall integrity pathway. These mutants had near normal growth rates in vitro but were attenuated in virulence in a murine model of systemic infection. However, tissue burdens for the Caoch1delta null mutant were similar to control strains with normal N-glycosylation, suggesting the host-fungal interaction was altered such that high burdens were tolerated. This demonstrates the importance of N-glycan outer chain epitopes to the host-fungal interaction and virulence.
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Affiliation(s)
- Steven Bates
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, United Kingdom
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Bates S, MacCallum DM, Bertram G, Munro CA, Hughes HB, Buurman ET, Brown AJP, Odds FC, Gow NAR. Candida albicans Pmr1p, a secretory pathway P-type Ca2+/Mn2+-ATPase, is required for glycosylation and virulence. J Biol Chem 2005; 280:23408-15. [PMID: 15843378 DOI: 10.1074/jbc.m502162200] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The cell surface of Candida albicans is the immediate point of contact with the host. The outer layer of the cell wall is enriched in highly glycosylated mannoproteins that are implicated in many aspects of the host-fungus interaction. Glycosylation of cell wall proteins is initiated in the endoplasmic reticulum and then elaborated in the Golgi as the protein passes through the secretory pathway. Golgi-bound mannosyltransferases require Mn(2+) as an essential cofactor. In Saccharomyces cerevisiae, the P-type ATPase Pmr1p transports Ca(2+) and Mn(2+) ions into the Golgi. To determine the effect of a gross defect in glycosylation on host-fungus interactions of C. albicans, we disrupted the PMR1 homolog, CaPMR1. This mutation would simultaneously inhibit many Golgi-located, Mn(2+)-dependent mannosyltransferases. The Capmr1Delta null mutant was viable in vitro and had no growth defect even on media containing low Ca(2+)/Mn(2+) ion concentrations. However, cells grown in these media progressively lost viability upon entering stationary phase. Phosphomannan was almost completely absent, and O-mannan was severely truncated in the null mutant. A defect in N-linked outer chain glycosylation was also apparent, demonstrated by the underglycosylation of surface acid phosphatase. Consistent with the glycosylation defect, the null mutant had a weakened cell wall, exemplified by hypersensitivity to Calcofluor white, Congo red, and hygromycin B and constitutive activation of the cell integrity pathway. In a murine model of systemic infection, the null mutant was severely attenuated in virulence. These results demonstrate the importance of glycosylation for cell wall structure and virulence of C. albicans.
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Affiliation(s)
- Steven Bates
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Scotland, UK
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Marchais V, Kempf M, Licznar P, Lefrançois C, Bouchara JP, Robert R, Cottin J. DNA array analysis ofCandida albicansgene expression in response to adherence to polystyrene. FEMS Microbiol Lett 2005; 245:25-32. [PMID: 15796975 DOI: 10.1016/j.femsle.2005.02.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2004] [Revised: 01/20/2005] [Accepted: 02/08/2005] [Indexed: 11/24/2022] Open
Abstract
Candidiasis is often initiated by the colonization of inert surfaces. In order to elucidate the mechanisms involved in this adherence process, DNA macroarrays were used to analyze the transcriptome of Candida albicans, the main causative agent of this mycoses, in a simple adherence model using germ tubes produced in polystyrene Petri dishes. Non-adherent germ tubes produced on glass surface were used as a control. Analysis of gene expression displayed 77 genes identified as statistically overexpressed in adherent germ tubes. Among these genes, some encoded enzymes participating in metabolism of lipids (such as LIP6), of proteins (such as SAP1) or of carbohydrates (like PGI1, PMI40 and PSA1. Some of these genes have already been reported as playing a role in pathogenesis of C. albicans. However, functions were unknown for a large part (45.5%) of the overexpressed genes which will be analyzed further in order to define their relationship with adherence.
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Affiliation(s)
- Véronique Marchais
- Groupe d'Etude des Interactions Hôte-Parasite, UPRES EA 3142, UFR des Sciences Pharmaceutiques et d'Ingénierie de la Santé, 16 Bd Daviers, 49045 Angers Cedex, France.
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Taweechaisupapong S, Choopan T, Singhara S, Chatrchaiwiwatana S, Wongkham S. In vitro inhibitory effect of Streblus asper leaf-extract on adhesion of Candida albicans to human buccal epithelial cells. JOURNAL OF ETHNOPHARMACOLOGY 2005; 96:221-226. [PMID: 15588674 DOI: 10.1016/j.jep.2004.09.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2004] [Revised: 06/28/2004] [Accepted: 09/06/2004] [Indexed: 05/24/2023]
Abstract
This in vitro study aimed at determining the effects of a sublethal concentration of Streblus asper Lour (Moraceae) leaf ethanolic extract on adherence of Candida albicans to human buccal epithelial cells (HBEC). The minimum concentration of Streblus asper leaf ethanolic extract (SAE) that significantly reduced adherence (P<0.05) after a 1-h exposure was 15.6 mg/ml. However, there was a significant reduction (P<0.05) of candidal adhesion to HBEC after 1-min exposure to 125 mg/ml of SAE. Pre-treatment of either Candida or HBEC, or both, with 125 mg/ml of SAE for 1h resulted in reduced adherence. SAE at concentrations of 125 and 250 mg/ml also showed 41 and 61% inhibition of germ tube formation, respectively, which might affect adherence. These findings indicate that the sublethal concentration of SAE may modulate candidal colonization of the oral mucosa thereby suppressing the invasive potential of the pathogen.
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Affiliation(s)
- S Taweechaisupapong
- Department of Oral Diagnosis, Faculty of Dentistry, Khon Kaen University, Khon Kaen 40002, Thailand.
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Munro CA, Bates S, Buurman ET, Hughes HB, MacCallum DM, Bertram G, Atrih A, Ferguson MAJ, Bain JM, Brand A, Hamilton S, Westwater C, Thomson LM, Brown AJP, Odds FC, Gow NAR. Mnt1p and Mnt2p of Candida albicans are partially redundant alpha-1,2-mannosyltransferases that participate in O-linked mannosylation and are required for adhesion and virulence. J Biol Chem 2004; 280:1051-60. [PMID: 15519997 PMCID: PMC3749086 DOI: 10.1074/jbc.m411413200] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The MNT1 gene of the human fungal pathogen Candida albicans is involved in O-glycosylation of cell wall and secreted proteins and is important for adherence of C. albicans to host surfaces and for virulence. Here we describe the molecular analysis of CaMNT2, a second member of the MNT1-like gene family in C. albicans. Mnt2p also functions in O-glycosylation. Mnt1p and Mnt2p encode partially redundant alpha-1,2-mannosyltransferases that catalyze the addition of the second and third mannose residues in an O-linked mannose pentamer. Deletion of both copies of MNT1 and MNT2 resulted in reduction in the level of in vitro mannosyltransferase activity and truncation of O-mannan. Both the mnt2Delta and mnt1Delta single mutants were significantly reduced in adherence to human buccal epithelial cells and Matrigel-coated surfaces, indicating a role for O-glycosylated cell wall proteins or O-mannan itself in adhesion to host surfaces. The double mnt1Deltamnt2Delta mutant formed aggregates of cells that appeared to be the result of abnormal cell separation. The double mutant was attenuated in virulence, underlining the importance of O-glycosylation in pathogenesis of C. albicans infections.
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Affiliation(s)
- Carol A. Munro
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Steven Bates
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Ed T. Buurman
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - H. Bleddyn Hughes
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Donna M. MacCallum
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Gwyneth Bertram
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Abdel Atrih
- School of Life Sciences, Wellcome Trust Building, University of Dundee, Dundee DD1 4NH, United Kingdom
| | - Michael A. J. Ferguson
- School of Life Sciences, Wellcome Trust Building, University of Dundee, Dundee DD1 4NH, United Kingdom
| | - Judith M. Bain
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Alexandra Brand
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Suzanne Hamilton
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Caroline Westwater
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Lynn M. Thomson
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Alistair J. P. Brown
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Frank C. Odds
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
| | - Neil A. R. Gow
- School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD United Kingdom
- To whom correspondence should be addressed. Tel.: 44-1224-555879; Fax.: 44-1224-555844;
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Dorocka-Bobkowska B, Konopka K, Düzgüneş N. Influence of antifungal polyenes on the adhesion of Candida albicans and Candida glabrata to human epithelial cells in vitro. Arch Oral Biol 2003; 48:805-14. [PMID: 14596870 DOI: 10.1016/s0003-9969(03)00174-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Candidal adherence to mucosal surfaces is considered as the first step in the pathogenesis of oral candidiasis. We examined the effect of antifungal polyenes, amphotericin B, nystatin and natamycin, at sublethal and minimum inhibitory concentrations (MICs) on the adherence of Candida albicans and Candida glabrata to HeLa cervical carcinoma and HSC-3 oral squamous cell carcinoma cells. A total of six oral Candida isolates were used throughout the study. Two Candida strains, C. albicans (44990) and C. glabrata (MYA-275) were obtained from ATCC. Four Candida strains, C. albicans 19 and 24 and C. glabrata 15 and 21, were isolated from patients with documented Candida-associated denture stomatitis. Cells were either incubated with Candida in the presence of the drug, or pre-incubated with yeasts and exposed subsequently to the drug. In the drug-free controls, the mean number of C. albicans yeasts associated with HeLa cells obtained from all experiments (130.1+/-10.1 yeasts/mm(2)) was significantly greater than that for HSC-3 cells (114.7+/-10.1 yeasts/mm(2); P<0.025). For C. glabrata, the mean adherence to HeLa and HSC-3 cells was 84.4+/-5.5 and 84.4+/-3.3 yeasts/mm(2), respectively, and these values were not statistically different (P>0.4). Candidal adherence was significantly reduced when the tested polyenes were present during the "adherence phase". The obtained values were significantly different from the controls, except for the effect of nystatin at the MIC on the adherence of C. glabrata strain MYA-275 to HeLa cells (P<0.375). Amphotericin B had the highest effect against both Candida species, reducing adherence by approximately 50 and approximately 60%, at the MIC and sublethal concentrations, respectively. The susceptibility of cell-associated Candida to polyenes was decreased markedly and the treatment did not result in significant detachment of adherent yeasts. The reduction in adherence was between 2 and 10%, when compared to the drug-free controls. These findings suggest that sub-therapeutic levels of polyenes that are likely to persist in the oral cavity following topical treatment may modulate candidal colonization when present during the "adherence phase".
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Affiliation(s)
- B Dorocka-Bobkowska
- Department of Microbiology, School of Dentistry, University of the Pacific, San Francisco, CA 94115, USA
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Abstract
Candida species are important nosocomial pathogens in the newborn population, particularly among the premature very-low-birth-weight infants in neonatal intensive care units. Candida colonization of the neonatal skin and gastrointestinal tract is an important first step in the pathogenesis of invasive disease. C albicans is the most commonly isolated species in colonized or infected infants. Over the past decade the incidence of both colonization and infection with other Candida species, particularly C parapsilosis, has risen dramatically. Colonization of the infant occurs early in life and is affected by a variety of common practices in neonatal intensive care. Microbial factors also augment colonization, including the ability of Candida to adhere to human epithelium. A better understanding of the complex interactions between host risk factors and virulence traits of colonizing yeast may allow the risk of systemic spread to be reduced in the population of premature infants.
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Affiliation(s)
- Catherine M Bendel
- Division of Neonatology, Department of Pediatrics, University of Minnesota Medical School, Minneapolis, MN, USA.
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49
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Crowe JD, Sievwright IK, Auld GC, Moore NR, Gow NAR, Booth NA. Candida albicans binds human plasminogen: identification of eight plasminogen-binding proteins. Mol Microbiol 2003; 47:1637-51. [PMID: 12622818 DOI: 10.1046/j.1365-2958.2003.03390.x] [Citation(s) in RCA: 182] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Several microbial pathogens augment their invasive potential by binding and activating human plasminogen to generate the proteolytic enzyme plasmin. Yeast cells and cell wall proteins (CWP) of the human pathogenic fungus Candida albicans bound plasminogen with a K(d) of 70 +/- 11 nM and 112 +/- 20 nM respectively. Bound plasminogen could be activated to plasmin by mammalian plasminogen activators; no C. albicans plasminogen activator was detected. Binding of plasminogen to CWP and whole cells was inhibited by epsilon ACA, indicating that binding was predominantly to lysine residues. Candida albicans mutant strains defective in protein glycosylation did not show altered plasminogen binding, suggesting that binding was not mediated via a surface lectin. Binding was sensitive to digestion by basic carboxypeptidase, implicating C-terminal lysine residues in binding. Proteomic analysis identified eight major plasminogen-binding proteins in isolated CWP. Five of these (phosphoglycerate mutase, alcohol dehydrogenase, thioredoxin peroxidase, catalase, transcription elongation factor) had C-terminal lysine residues and three (glyceraldehyde-3-phosphate dehydrogenase, phosphoglycerate kinase and fructose bisphosphate aldolase) did not. Activation of plasminogen could potentially increase the capacity of this pathogenic fungus for tissue invasion and necrosis. Although surface-bound plasmin(ogen) degraded fibrin, no direct evidence for a role in invasion of endothelial matrix or in penetration and damage of endothelial cells was found.
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Affiliation(s)
- Jonathan D Crowe
- Department of Molecular and Cell Biology, Institute of Medical Sciences, University of Aberdeen, Aberdeen AB25 2ZD, UK
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50
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Anil S, Ellepola ANB, Samaranayake LP. The impact of polyene, azole, and DNA analogue antimycotics on the cell surface hydrophobicity of Candida albicans and Candida tropicalis in HIV infection. Mycopathologia 2002; 153:179-85. [PMID: 12014477 DOI: 10.1023/a:1014932302518] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Oral candidiasis is the most common opportunistic infection in individuals infected with the human immunodeficiency virus. Though Candida albicans is the major aetiological agent, non-albicans species such Candida tropicalis are now emerging as important agents of such infection. The Candida cell surface hydrophobicity (CSH) is considered a critical factor contributing to its colonization potential and virulence. It is also known that brief exposure to sub-cidal concentrations of antifungal agents is a likely scenario in the oral environment where the administered drugs are diluted continuously due to the flushing action of saliva. Hence the objective of the present study was to compare the CSH of 10 isolates each of C. albicans and C. tropicalis from HIV-infected individuals following brief exposure (1 hour) of isolates to sub-therapeutic concentrations of nystatin, amphotericin B, ketoconazole, fluconazole and 5-flurocytosine. The CSH was assessed by a previously described biphasic aqueous-hydrocarbon assay. The mean percentage reduction of CSH of C. albicans following brief exposure to nystatin, amphotericin B, ketoconazole, fluconazole and 5-flurocytosine was 27.33 (p < 0.001), 21.34 (p < 0.05), 11.74 (p > 0.05), 18.4 (p > 0.05) and 14.64 (p > 0.05) respectively. The mean percentage reduction of CSH of C. tropicalis following brief exposure to nystatin, amphotericin B, ketoconazole, fluconazole and 5-flurocytosine was 33.81 (p < 0.01), 28.88 (p < 0.01), 12.6 (p > 0.05), 21.53 (p > 0.05) and 17.68 (p > 0.05) respectively. A significant interspecies variation in CSH was observed for nystatin and amphoterecin B. Overall the results reveal that the CSH of C. albicans is affected to a significantly lesser degree compared with C. tropicalis when exposed to the antifungals. These data further illustrate another mode of action of antifungals on Candida leading to a reduction in the CSH and thereby the yeast adherence to host tissues.
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Affiliation(s)
- S Anil
- Oral Biosciences, Faculty of Dentistry, University of Hong Kong, Hong Kong
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