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Ruiz de Alegría-Puig C, Rodríguez-Lozano J, Agüero-Balbin J. Identification and antifungal susceptibility testing of Candida haemulonii complex isolated from clinical samples. Folia Microbiol (Praha) 2024; 69:165-171. [PMID: 38148373 DOI: 10.1007/s12223-023-01122-3] [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: 07/05/2023] [Accepted: 12/09/2023] [Indexed: 12/28/2023]
Abstract
Candida haemulonii complex (Candida haemulonii [I], Candida duobushaemulonii [II], and Candida haemulonii var. vulnera [III]) has become relevant in recent times, not so much because of a high incidence in human clinical sample cultures but because of its remarkable antifungal resistance. The objective of this study was to evaluate several methods for the identification of this uncommon species of Candida. Ten isolates of C. haemulonii were identified by biochemical and proteomic methods, and their antifungal susceptibility testing was performed by both commercial and reference methods. MALDI-TOF MS (Vitek MS and Vitek MS PRIME) and Vitek2 correctly identified these genera but API method did not. There was a good correlation between the commercial methods and the reference methods for the AST. In conclusion Vitek MS, Vitek MS PRIME, and Vitek2 systems, but not API32C, are reliable for identification of C. haemulonii complex. Furthermore, MALDI-TOF MS systems could identify to the subspecies level. Commercial methods for antifungal susceptibility testing are valid for the study of this species and confirm amphotericin B and to azole resistance.
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Affiliation(s)
- Carlos Ruiz de Alegría-Puig
- Microbiology Service, University Hospital Marqués de Valdecilla-IDIVAL-CIBERINFEC, Avda. Valdecilla s/n, CP 39008, Santander, Spain.
| | - Jesús Rodríguez-Lozano
- Microbiology Service, University Hospital Marqués de Valdecilla-IDIVAL-CIBERINFEC, Avda. Valdecilla s/n, CP 39008, Santander, Spain
| | - Jesús Agüero-Balbin
- Microbiology Service, University Hospital Marqués de Valdecilla-IDIVAL-CIBERINFEC, Avda. Valdecilla s/n, CP 39008, Santander, Spain
- Department of Molecular Biology, University of Cantabria, Santander, Spain
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2
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Ramesh S, Roy U, Roy S, Rudramurthy SM. A promising antifungal lipopeptide from Bacillus subtilis: its characterization and insight into the mode of action. Appl Microbiol Biotechnol 2024; 108:161. [PMID: 38252130 DOI: 10.1007/s00253-023-12976-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/20/2023] [Accepted: 11/27/2023] [Indexed: 01/23/2024]
Abstract
Emerging resistance of fungal pathogens and challenges faced in drug development have prompted renewed investigations into novel antifungal lipopeptides. The antifungal lipopeptide AF3 reported here is a natural lipopeptide isolated and purified from Bacillus subtilis. The AF3 lipopeptide's secondary structure, functional groups, and the presence of amino acid residues typical of lipopeptides were determined by circular dichroism, Fourier transform infrared spectroscopy, and nuclear magnetic resonance spectroscopy. The lipopeptide's low minimum inhibitory concentrations (MICs) of 4-8 mg/L against several fungal strains demonstrate its strong antifungal activity. Biocompatibility assays showed that ~ 80% of mammalian cells remained viable at a 2 × MIC concentration of AF3. The treated Candida albicans cells examined by scanning electron microscopy, transmission electron microscopy, and atomic force microscopy clearly showed ultrastructural alterations such as the loss of the cell shape and cell membrane integrity. The antifungal effect of AF3 resulted in membrane permeabilization facilitating the uptake of the fluorescent dyes-acridine orange (AO)/propidium iodide (PI) and FUN-1. Using 1,6-diphenyl-1,3,5-hexatriene (DPH) and 4-(2-[6-(dioctylamino)-2-naphthalenyl] ethenyl)-1-(3-sulfopropyl) pyridinium inner salt (di-8-ANEPPS), we observed that the binding of AF3 to the membrane bilayer results in membrane disruption and depolarization. Flow cytometry analyses revealed a direct correlation between lipopeptide activity, membrane permeabilization (~ 75% PI uptake), and reduced cell viability. An increase in 2',7'-dichlorodihydrofluorescein diacetate (DCFH-DA) fluorescence demonstrates endogenous reactive oxygen species production. Lipopeptide treatment appears to induce late-stage apoptosis and alterations to nuclear morphology, suggesting that AF3-induced membrane damage may lead to a cellular stress response. Taken together, this study illustrates antifungal lipopeptide's potential as an antifungal drug candidate. KEY POINTS: • The studied lipopeptide variant AF3 displayed potent antifungal activity against C. albicans • Its biological activity was stable to proteolysis • Analytical studies demonstrated that the lipopeptide is essentially membranotropic and able to cause membrane dysfunction, elevated ROS levels, apoptosis, and DNA damage.
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Affiliation(s)
- Swetha Ramesh
- Department of Biological Sciences, BITS Pilani K.K. Birla Goa Campus, NH 17B Bypass Road, Sancoale, Goa, 403726, India
| | - Utpal Roy
- Department of Biological Sciences, BITS Pilani K.K. Birla Goa Campus, NH 17B Bypass Road, Sancoale, Goa, 403726, India.
| | - Subhasish Roy
- Department of Chemistry, BITS Pilani K.K. Birla Goa Campus, NH 17B Bypass Road, Sancoale, Goa, 403726, India
| | - Shivaprakash M Rudramurthy
- Department of Medical Microbiology, Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
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3
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Gómez-Gaviria M, Martínez-Álvarez JA, Chávez-Santiago JO, Mora-Montes HM. Candida haemulonii Complex and Candida auris: Biology, Virulence Factors, Immune Response, and Multidrug Resistance. Infect Drug Resist 2023; 16:1455-1470. [PMID: 36942024 PMCID: PMC10024503 DOI: 10.2147/idr.s402754] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 03/06/2023] [Indexed: 03/16/2023] Open
Abstract
There is worldwide concern about the constant increase in infections caused by Candida species that are multiresistant to antifungal drugs. The most common candidiasis is caused by Candida albicans, however, the species of the Candida haemulonii complex and Candida auris are emerging opportunistic pathogens, which isolation from clinical samples has significantly increased in the past years. The special interest in the study of these species lies in their ability to evade the action of antifungal drugs, such as amphotericin B, azoles, and echinocandins. In addition, the phenotypic changes of these species have given them the ability to easily adapt to environmental changes, including the host milieu and immunity. In this paper, a detailed review of the current literature on the C. haemulonii complex and C. auris is shown, analyzing aspects such as biology, immune response, putative virulence factors, infection, treatment, and the current strategies for diagnosis.
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Affiliation(s)
- Manuela Gómez-Gaviria
- Departamento de Biología, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato, Guanajuato, Gto, México
- Correspondence: Manuela Gómez-Gaviria; Héctor M Mora-Montes, Departamento de Biología, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato, Noria Alta s/n, Col. Noria Alta, Guanajuato, Gto, C. P. 36050, México, Tel +52 473-7320006 Ext. 8193, Fax +52 473-7320006 Ext. 8153, Email ;
| | - José A Martínez-Álvarez
- Departamento de Biología, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato, Guanajuato, Gto, México
| | - Joaquín O Chávez-Santiago
- Departamento de Biología, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato, Guanajuato, Gto, México
| | - Héctor M Mora-Montes
- Departamento de Biología, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato, Guanajuato, Gto, México
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4
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Immune defence to invasive fungal infections: A comprehensive review. Biomed Pharmacother 2020; 130:110550. [DOI: 10.1016/j.biopha.2020.110550] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 07/20/2020] [Accepted: 07/20/2020] [Indexed: 12/14/2022] Open
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5
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Rhimi W, Theelen B, Boekhout T, Otranto D, Cafarchia C. Malassezia spp. Yeasts of Emerging Concern in Fungemia. Front Cell Infect Microbiol 2020; 10:370. [PMID: 32850475 PMCID: PMC7399178 DOI: 10.3389/fcimb.2020.00370] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 06/16/2020] [Indexed: 12/23/2022] Open
Abstract
Malassezia spp. are lipid-dependent yeasts, inhabiting the skin and mucosa of humans and animals. They are involved in a variety of skin disorders in humans and animals and may cause bloodstream infections in severely immunocompromised patients. Despite a tremendous increase in scientific knowledge of these yeasts during the last two decades, the epidemiology of Malassezia spp. related to fungemia remains largely underestimated most likely due to the difficulty in the isolation of these yeasts species due to their lipid-dependence. This review summarizes and discusses the most recent literature on Malassezia spp. infection and fungemia, its occurrence, pathogenicity mechanisms, diagnostic methods, in vitro susceptibility testing and therapeutic approaches.
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Affiliation(s)
- Wafa Rhimi
- Dipartimento di Medicina Veterinaria, Università degli Studi "Aldo Moro", Bari, Italy
| | - Bart Theelen
- Yeast Research, Westerdijk Fungal Biodiversity Institute, Utrecht, Netherlands
| | - Teun Boekhout
- Yeast Research, Westerdijk Fungal Biodiversity Institute, Utrecht, Netherlands.,The Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, Amsterdam, Netherlands.,Shanghai Key Laboratory of Molecular Medical Mycology, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Domenico Otranto
- Dipartimento di Medicina Veterinaria, Università degli Studi "Aldo Moro", Bari, Italy.,Faculty of Veterinary Sciences, Bu-Ali Sina University, Hamedan, Iran
| | - Claudia Cafarchia
- Dipartimento di Medicina Veterinaria, Università degli Studi "Aldo Moro", Bari, Italy
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Roselletti E, Perito S, Sabbatini S, Monari C, Vecchiarelli A. Vaginal Epithelial Cells Discriminate Between Yeast and Hyphae of Candida albicans in Women Who Are Colonized or Have Vaginal Candidiasis. J Infect Dis 2020; 220:1645-1654. [PMID: 31300818 DOI: 10.1093/infdis/jiz365] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 07/10/2019] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Vaginal candidiasis is common disease affecting women; however, how Candida albicans shift from commensalism towards a pathogenic status remains poorly understood. The present study investigated the vaginal epithelial cell (EC) response dynamics under various conditions. METHODS Healthy women, asymptomatic C. albicans carriers, and symptomatic patients with vaginal candidiasis were enrolled in this study. ECs in vaginal swabs were analyzed with cytofluorimetric analysis for pattern recognition receptors and intracellular signals, with lactate dehydrogenase assay performed for cell damage, and an enzyme-linked immunosorbent assay for cytokine expression. RESULTS The level of toll-like receptor 4 (TLR4), TLR2, and erythropoietin-producing hepatoma A2 (EphA2) expression was significantly higher in ECs from asymptomatic and symptomatic subjects compared to healthy subjects. Activation of transcription factors, nuclear factor-κB (NF-κB) and c-Fos-p-38, was observed in ECs from symptomatic and asymptomatic pseudohyphae/hyphae carriers but not from the asymptomatic yeast carriers. EC damage was only observed in symptomatic patients. CONCLUSIONS The presence of pseudohyphae/hyphae is required to determine vaginal candidiasis; however, it may be not sufficient to induce the pathologic process associated with neutrophil recruitment and EC damage. This study sheds light on the ambiguous role of the hyphal form during vaginal human commensalism.
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7
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Biofilm Formed by Candida haemulonii Species Complex: Structural Analysis and Extracellular Matrix Composition. J Fungi (Basel) 2020; 6:jof6020046. [PMID: 32260180 PMCID: PMC7345111 DOI: 10.3390/jof6020046] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 04/01/2020] [Accepted: 04/01/2020] [Indexed: 01/18/2023] Open
Abstract
Candida haemulonii species complex (C. haemulonii, C. duobushaemulonii, and C. haemulonii var. vulnera) has emerged as opportunistic, multidrug-resistant yeasts able to cause fungemia. Previously, we showed that C. haemulonii complex formed biofilm on polystyrene. Biofilm is a well-known virulence attribute of Candida spp. directly associated with drug resistance. In the present study, the architecture and the main extracellular matrix (ECM) components forming the biofilm over polystyrene were investigated in clinical isolates of the C. haemulonii complex. We also evaluated the ability of these fungi to form biofilm on catheters used in medical arena. The results revealed that all fungi formed biofilms on polystyrene after 48 h at 37 °C. Microscopic analyses demonstrated a dense network of yeasts forming the biofilm structure, with water channels and ECM. Regarding ECM, proteins and carbohydrates were the main components, followed by nucleic acids and sterols. Mature biofilms were also detected on late bladder (siliconized latex), nasoenteric (polyurethane), and nasogastric (polyvinyl chloride) catheters, with the biomasses being significantly greater than on polystyrene. Collectively, our results demonstrated the ability of the C. haemulonii species complex to form biofilm on different types of inert surfaces, which is an incontestable virulence attribute associated with devices-related candidemia in hospitalized individuals.
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Vargas-Blanco D, Lynn A, Rosch J, Noreldin R, Salerni A, Lambert C, Rao RP. A pre-therapeutic coating for medical devices that prevents the attachment of Candida albicans. Ann Clin Microbiol Antimicrob 2017; 16:41. [PMID: 28526091 PMCID: PMC5438570 DOI: 10.1186/s12941-017-0215-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Accepted: 05/12/2017] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Hospital acquired fungal infections are defined as "never events"-medical errors that should never have happened. Systemic Candida albicans infections results in 30-50% mortality rates. Typically, adhesion to abiotic medical devices and implants initiates such infections. Efficient adhesion initiates formation of aggressive biofilms that are difficult to treat. Therefore, inhibitors of adhesion are important for drug development and likely to have a broad spectrum efficacy against many fungal pathogens. In this study we further the development of a small molecule, Filastatin, capable of preventing C. albicans adhesion. We explored the potential of Filastatin as a pre-therapeutic coating of a diverse range of biomaterials. METHODS Filastatin was applied on various biomaterials, specifically bioactive glass (cochlear implants, subcutaneous drug delivery devices and prosthetics); silicone (catheters and other implanted devices) and dental resin (dentures and dental implants). Adhesion to biomaterials was evaluated by direct visualization of wild type C. albicans or a non-adherent mutant edt1 -/- that were stained or fluorescently tagged. Strains grown overnight at 30 °C were harvested, allowed to attach to surfaces for 4 h and washed prior to visualization. The adhesion force of C. albicans cells attached to surfaces treated with Filastatin was measured using Atomic Force Microscopy. Effectiveness of Filastatin was also demonstrated under dynamic conditions using a flow cell bioreactor. The effect of Filastatin under microfluidic flow conditions was quantified using electrochemical impedance spectroscopy. Experiments were typically performed in triplicate. RESULTS Treatment with Filastatin significantly inhibited the ability of C. albicans to adhere to bioactive glass (by 99.06%), silicone (by 77.27%), and dental resin (by 60.43%). Atomic force microcopy indicated that treatment with Filastatin decreased the adhesion force of C. albicans from 0.23 to 0.017 nN. Electrochemical Impedance Spectroscopy in a microfluidic device that mimic physiological flow conditions in vivo showed lower impedance for C. albicans when treated with Filastatin as compared to untreated control cells, suggesting decreased attachment. The anti-adhesive properties were maintained when Filastatin was included in the preparation of silicone materials. CONCLUSION We demonstrate that Filastatin treated medical devices prevented adhesion of Candida, thereby reducing nosocomial infections.
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Affiliation(s)
- Diego Vargas-Blanco
- Life Science and Bioengineering Center, Worcester Polytechnic Institute, 60 Prescott Street, Worcester, MA 01609 USA
| | - Aung Lynn
- Life Science and Bioengineering Center, Worcester Polytechnic Institute, 60 Prescott Street, Worcester, MA 01609 USA
| | - Jonah Rosch
- Life Science and Bioengineering Center, Worcester Polytechnic Institute, 60 Prescott Street, Worcester, MA 01609 USA
| | - Rony Noreldin
- Life Science and Bioengineering Center, Worcester Polytechnic Institute, 60 Prescott Street, Worcester, MA 01609 USA
| | - Anthony Salerni
- Life Science and Bioengineering Center, Worcester Polytechnic Institute, 60 Prescott Street, Worcester, MA 01609 USA
| | - Christopher Lambert
- Life Science and Bioengineering Center, Worcester Polytechnic Institute, 60 Prescott Street, Worcester, MA 01609 USA
| | - Reeta P. Rao
- Life Science and Bioengineering Center, Worcester Polytechnic Institute, 60 Prescott Street, Worcester, MA 01609 USA
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9
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Chen S, Sun KY, Feng XW, Ran X, Lama J, Ran YP. Efficacy and safety of itraconazole use in infants. World J Pediatr 2016; 12:399-407. [PMID: 27286691 DOI: 10.1007/s12519-016-0034-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Accepted: 03/18/2015] [Indexed: 02/05/2023]
Abstract
BACKGROUND Itraconazole has been used to treat fungal infections, in particular invasive fungal infections in infants or neonates in many countries. DATA SOURCES Literature search was conducted through Ovid EMBASE, PubMed, ISI Web of Science, CNKI and Google scholarship using the following key words: "pediatric" or "infant" or "neonate" and "fungal infection" in combination with "itraconazole". Based on the literature and our clinical experience, we outline the administration of itraconazole in infants in order to develop evidence-based pharmacotherapy. RESULTS Of 45 articles on the use of itraconazole in infancy, 13 are related to superficial fungal infections including tinea capitis, sporotrichosis, mucosal fungal infections and opportunistic infections. The other 32 articles are related to systemic fungal infections including candidiasis, aspergillosis, histoplasmosis, zygomycosis, trichosporonosis and opportunistic infections as caused by Myceliophthora thermophila. CONCLUSION Itraconazole is safe and effective at a dose of 5 mg/kg per day in a short duration of therapy for superficial fungal infections and 10 mg/kg per day for systemic fungal infections in infants. With a good compliance, it is cost-effective in treating infantile fungal infections. The profiles of adverse events induced by itraconazole in infants are similar to those in adults and children.
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Affiliation(s)
- Shuang Chen
- Department of Dermatovenereology, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Kai-Yi Sun
- Department of Dermatovenereology, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Xiao-Wei Feng
- Department of Dermatovenereology, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Xin Ran
- Department of Dermatovenereology, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Jebina Lama
- Department of Dermatovenereology, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Yu-Ping Ran
- Department of Dermatovenereology, West China Hospital, Sichuan University, Chengdu, 610041, China.
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10
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Fang SY, Wei KC, Chen WC, Lee SJ, Yang KC, Wu CS, Sun PL. Primary deep cutaneous candidiasis caused by Candida duobushaemulonii in a 68-year-old man: the first case report and literature review. Mycoses 2016; 59:818-821. [PMID: 27600646 DOI: 10.1111/myc.12540] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 06/07/2016] [Accepted: 07/04/2016] [Indexed: 12/28/2022]
Abstract
Superficial candida infections of the skin are common, but deep cutaneous candidiasis, including secondary dissemination to the skin from systemic candidiasis, candidaemia or primary invasion due to skin defects such as trauma, is rare. These patients are usually immunosuppressed, but immunocompetent hosts can be affected as well. Candida albicans is the most common pathogen. However, non-albicans Candida species can cause deep skin invasion in rare circumstances. We report a case of deep cutaneous candidiasis caused by Candida duobushaemulonii in a 68-year-old man. Deep tissue invasion was confirmed by skin histopathology examination. The pathogen was initially identified as C. haemulonii using the VITEK® 2 system for microbial identification, but was later determined to be C. duobushaemulonii based on sequencing of the internal transcribed spacer region of ribosomal DNA and D1/D2 region of 26S rDNA. The patient was successfully treated with amphotericin B, followed by fluconazole and surgical intervention. To the best of our knowledge, this is the first case of deep cutaneous infection by C. duobushaemulonii.
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Affiliation(s)
- Szu-Yun Fang
- Department of Dermatology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Kai-Che Wei
- Department of Dermatology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Wen-Chieh Chen
- Department of Dermatology and Allergy, Technische Universität München, Munich, Germany.,IZZ-Immunologie Zentrum Zürich, Zürich, Switzerland
| | - Shin-Jung Lee
- Section of Infectious Diseases, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan.,School of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Kuo-Chung Yang
- Department of Plastic Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Chieh-Shan Wu
- Department of Dermatology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Pei-Lun Sun
- Department of Dermatology, Chang Gung Memorial Hospital, Linkou Branch, Taoyuan, Taiwan.,College of Medicine, Chang Gung University, Taoyuan, Taiwan
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11
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Susceptibility to antifungal agents and enzymatic activity of Candida haemulonii and Cutaneotrichosporon dermatis isolated from soft corals on the Brazilian reefs. Arch Microbiol 2016; 198:963-971. [DOI: 10.1007/s00203-016-1254-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 05/02/2016] [Accepted: 06/02/2016] [Indexed: 01/04/2023]
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12
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Moyes DL, Richardson JP, Naglik JR. Candida albicans-epithelial interactions and pathogenicity mechanisms: scratching the surface. Virulence 2016; 6:338-46. [PMID: 25714110 PMCID: PMC4601190 DOI: 10.1080/21505594.2015.1012981] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Until recently, epithelial cells have been a largely ignored component of host responses to microbes. However, this has been largely overturned over the last decade as an ever increasing number of studies have highlighted the key role that these cells play in many of our interactions with our microbiota and pathogens. Interactions of these cells with Candida albicans have been shown to be critical not just in host responses, but also in fungal cell responses, regulating fungal morphology and gene expression profile. In this review, we will explore the interactions between C. albicans and epithelial cells, and discuss how these interactions affect our relationship with this fungus.
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Affiliation(s)
- David L Moyes
- a Mucosal & Salivary Biology Division ; King's College London Dental Institute; King's College London ; London , UK
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13
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Silva CM, Carvalho-Parahym AMR, Macêdo DPC, Lima-Neto RG, Francisco EC, Melo ASA, da Conceição M Silva M, Jucá MB, Mello LRB, Amorim RMJ, Neves RP. Neonatal Candidemia Caused by Candida haemulonii: Case Report and Review of Literature. Mycopathologia 2015; 180:69-73. [PMID: 25666389 DOI: 10.1007/s11046-015-9872-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 02/03/2015] [Indexed: 11/28/2022]
Abstract
Candidemia is a frequent condition in Neonatal Intensive Care Units (NICU) and usually complicates the newborns clinical course. Several factors are responsible for candidiasis, such as prematurity and use of broad-spectrum antibiotics, and in these cases, there are the involvement of various Candida species, as C. albicans, and C. parapsilosis. However, other species as C. haemulonii has been rarely described in candidemia cases, being considered an emergent pathogen. Thus, we report a case of neonatal candidemia by C. haemulonii and a review of literature of fungemia by this yeast. The patient was a neonate with gestational age of 26 weeks and birth weight of 660 g hospitalized in a NICU from a Brazilian hospital. The identification of the etiological agent was performed by phenotypic methods, scanning electron microscopy, sequencing of the ITS region of rDNA, and mass spectrometry. Antifungal susceptibility testing was carried out according to the Clinical Laboratories and Standards Institute guidelines. The newborn was diagnosed with candidemia by C. haemulonii resistant to amphotericin B with minimal inhibitory concentration (MIC) of 8 µg/mL, sensitive to fluconazole (MIC: 8 µg/mL) and voriconazole (MIC: 0.12 µg/mL). The treatment with fluconazole (12 mg/kg/day) was established with good outcome. Candidemia by C. haemulonii is still being limited to a few sporadic cases in adults with endemic and restricted occurrences in neonates. Usually, the therapy with amphotericin B is ineffective against this species. Our results showed the importance of the mycological diagnosis associated to antifungigrama for the successful clinical management followed by important epidemiological data.
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Affiliation(s)
- Carolina M Silva
- Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235, Cidade Universitária, Recife, PE, 50670-901, Brazil
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14
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Abstract
Fungal infections are becoming increasingly prevalent in the human population and contribute to morbidity and mortality in healthy and immunocompromised individuals respectively. Candida albicans is the most commonly encountered fungal pathogen of humans, and is frequently found on the mucosal surfaces of the body. Host defense against C. albicans is dependent upon a finely tuned implementation of innate and adaptive immune responses, enabling the host to neutralise the invading fungus. Central to this protection are the adaptive Th1 and Th17 cellular responses, which are considered paramount to successful immune defense against C. albicans infections, and enable tissue homeostasis to be maintained in the presence of colonising fungi. This review will highlight the recent advances in our understanding of adaptive immunity to Candida albicans infections.
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Affiliation(s)
- Jonathan P Richardson
- a Mucosal and Salivary Biology Division ; Dental Institute; King's College London ; London , UK
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15
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Abstract
The human pathogenic fungus Candida albicans is the predominant cause of both superficial and invasive forms of candidiasis. C. albicans primarily infects immunocompromised individuals as a result of either immunodeficiency or intervention therapy, which highlights the importance of host immune defences in preventing fungal infections. The host defence system utilises a vast communication network of cells, proteins, and chemical signals distributed in blood and tissues, which constitute innate and adaptive immunity. Over the last decade the identity of many key molecules mediating host defence against C. albicans has been identified. This review will discuss how the host recognises this fungus, the events induced by fungal cells, and the host innate and adaptive immune defences that ultimately resolve C. albicans infections during health.
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Shin SH, Lee YS, Shin YP, Kim B, Kim MH, Chang HR, Jang WS, Lee IH. Therapeutic efficacy of halocidin-derived peptide HG1 in a mouse model of Candida albicans oral infection. J Antimicrob Chemother 2013; 68:1152-60. [PMID: 23302580 DOI: 10.1093/jac/dks513] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
OBJECTIVES HG1 is an antimicrobial peptide derived from halocidin, which is naturally found in tunicates. The purpose of this study was to evaluate the therapeutic potential of HG1 as a novel antifungal agent for treating oral candidiasis. METHODS The pharmacokinetic properties of HG1 were explored in mice, which were orally administered a single dose of HG1. Anti-Candida activity of HG1 was investigated in a time-dependent manner in the presence of saliva obtained from healthy donors or patients with oral candidiasis. In addition, HG1 was evaluated for its anti-Candida activity in the presence of proteins extracted from the culture supernatant of Candida albicans. The therapeutic potential in vivo and ex vivo of HG1 against oral candidiasis was investigated using a mouse model of oral candidiasis. RESULTS Our data showed that absorption of HG1 into the blood did not occur following oral administration. In addition, HG1 exerted marked anti-Candida activity after short-term incubation at a concentration of 20 mg/L and it also caused a considerable reduction in fungal burden in the oral candidiasis mouse model when treated with 1 mg or 0.5 mg. CONCLUSIONS This study suggests that HG1, as a novel component of mouthwash, might become an alternative antifungal agent to conventional drugs used to manage oral candidiasis.
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Affiliation(s)
- Seo Hwa Shin
- Department of Biotechnology, Hoseo University, Asan City, Chungnam 336-795, South Korea
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17
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Sarma S, Kumar N, Sharma S, Govil D, Ali T, Mehta Y, Rattan A. Candidemia caused by amphotericin B and Fluconazole resistant Candida auris. Indian J Med Microbiol 2013; 31:90-1. [DOI: 10.4103/0255-0857.108746] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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18
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Almeida JND, Motta AL, Rossi F, Abdala E, Pierrotti LC, Kono ASG, Diz MDPE, Benard G, Del Negro GMB. First report of a clinical isolate of Candida haemulonii in Brazil. Clinics (Sao Paulo) 2012; 67:1229-31. [PMID: 23070353 PMCID: PMC3460029 DOI: 10.6061/clinics/2012(10)18] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Affiliation(s)
- João Nobrega de Almeida
- Microbiology Section, Divisão de Laboratório Central, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo/SP, Brazil.
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19
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Mucosal immunity and Candida albicans infection. Clin Dev Immunol 2011; 2011:346307. [PMID: 21776285 PMCID: PMC3137974 DOI: 10.1155/2011/346307] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Accepted: 05/27/2011] [Indexed: 02/06/2023]
Abstract
Interactions between mucosal surfaces and microbial microbiota are key to host defense, health, and disease. These surfaces are exposed to high numbers of microbes and must be capable of distinguishing between those that are beneficial or avirulent and those that will invade and cause disease. Our understanding of the mechanisms involved in these discriminatory processes has recently begun to expand as new studies bring to light the importance of epithelial cells and novel immune cell subsets such as T(h)17 T cells in these processes. Elucidating how these mechanisms function will improve our understanding of many diverse diseases and improve our ability to treat patients suffering from these conditions. In our voyage to discover these mechanisms, mucosal interactions with opportunistic commensal organisms such as the fungus Candida albicans provide insights that are invaluable. Here, we review current knowledge of the interactions between C. albicans and epithelial surfaces and how this may shape our understanding of microbial-mucosal interactions.
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20
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Awasthi AK, Jain A, Awasthi S, Ambast A, Singh K, Mishra V. Epidemiology and microbiology of nosocomial pediatric candidemia at a northern Indian tertiary care hospital. Mycopathologia 2011; 172:269-77. [PMID: 21533904 DOI: 10.1007/s11046-011-9431-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2010] [Accepted: 04/19/2011] [Indexed: 11/27/2022]
Abstract
The availability and aggressive use of chemotherapeutic and immunosuppressive agents as well as broad-spectrum antibacterial agents have created a large population of patients who are at increased risk of acquiring infections with fungal organisms, especially Candida species. Present work was undertaken to study the epidemiology and microbiology of candidemia and Candida colonization in hospitalized children. A total of 323 suspected cases of septicemia were enrolled, of which blood culture from 7.4% subjects was positive for Candida species. In total, 57.3% subjects were colonized by Candida species at least at one of the tested sites. Of 337 isolates, 24.3, 71.5, 2.9, 0.59, and 0.59% were Candida albicans, Candida tropicalis, Candida krusei, Candida kefyr, and Candida lusitaniae, respectively. Antifungal susceptibility results show that fluconazole, itraconazole, and amphotericin B resistance is prevalent in 18.2, 2.4, and 3.6% of C. albicans isolates, and 21.1, 4.6, and 0.04% of C. tropicalis isolates, respectively. In a large number of cases, source of blood infection was patient's own colonizers, as shown by genetic matching. It was also noted that some strain types are circulating within the ward. High prevalence of non-albicans candidemia with high resistance to fluconazole is prevalent in North Indian hospitalized children.
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Affiliation(s)
- Avijit Kumar Awasthi
- Department of Microbiology, Chhatrapati Shahuji Maharaj Medical University (Erstwhile King George's Medical University), Lucknow, Uttar Pradesh, 226 003, India
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21
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Khosravi AR, Shokri H, Tootian Z, Alizadeh M, Yahyaraeyat R. Comparative efficacies of Zataria multiflora essential oil and itraconazole against disseminated Candida albicans infection in BALB/c mice. Braz J Microbiol 2009; 40:439-45. [PMID: 24031384 PMCID: PMC3768526 DOI: 10.1590/s1517-83822009000300003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2008] [Revised: 08/06/2008] [Accepted: 05/03/2009] [Indexed: 11/21/2022] Open
Abstract
Disseminated candidiasis is a serious problem in public health that results from the invasion of Candida species, in particular Candida albicans. The aim of this study was to compare the efficacies of Zataria multiflora essential oil and itraconazole in clearing C. albicans from the visceral organs of BALB/c mice suffered from disseminated candidiasis. Zataria multiflora essential oil was extracted using Clevenger-type apparatus and analyzed by gas chromatography mass spectrometry (GC-MS). For clearance experiment, mice (20-25 g, N=8 per group) received essential oil at doses of 30, 48 and 64 mg/kg and itraconazole at dose of 200 mg/kg intraperitoneally (IP) 2 days before and after intravenous inoculation of 0.5 × 106C. albicans blastospores. The treated animals were sacrificed on day 20, and 0.1 g of the tissue homogenates was plated onto specific media. In GC-Mass, the main components of the essential oil were carvacrol (61.29%) and thymol (25.18%). The results demonstrated that IP administration of 64 mg/kg of the essential oil had the highest efficacy in reducing C. albicans and produced 39.5, 21.8, 141.5, 174 and 501-fold reductions in mean CFUs per 0.1 gram in Candida infections of the liver, spleen, lungs, brain and kidneys, respectively, compared to positive control. Itraconazole showed significantly more responsiveness than the essential oil at dose of 30 mg/kg in clearing C. albicans from the kidneys (P<0.02), brain (P<0.02) and spleen (P<0.04), and less responsiveness than that of 64 mg/kg in clearing the organism from the brain (P<0.01), lungs (P<0.0005) and kidneys (P<0.0005), whereas no significant difference was observed between this drug and Z. multiflora at dose of 48 mg/kg. These data explain the increased rate of yeast clearance and reduced dissemination to the viscera of Z. multiflora treated mice.
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Affiliation(s)
- A R Khosravi
- Mycology Research Center, Faculty of Veterinary Medicine, University of Tehran , Tehran , Iran
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22
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Filioti I, Iosifidis E, Roilides E. Therapeutic strategies for invasive fungal infections in neonatal and pediatric patients. Expert Opin Pharmacother 2009; 9:3179-96. [PMID: 19040339 DOI: 10.1517/14656560802560005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Invasive Candida and Aspergillus infections are the most commonly encountered fungal infections. They appear to be life threatening in the setting of profound immunosuppression, whereas cases that are resistant to antifungal therapy are occasionally encountered. Novel antifungal triazole and echinocandin agents appear to exhibit good activity as first-line or salvage therapy, whereas the use of amphotericin B formulations is particularly valuable in neonates. Significant differences in toxicity have been demonstrated among various antifungal agents with in vitro activity from available comparative data on fungal infections in children: however, no clear difference in treatment efficacy has been demonstrated. However, very little data are available about neonates. Host factors and responsible fungal species most frequently guide the choice of therapy.
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Affiliation(s)
- Ioanna Filioti
- Pediatrician Aristotle University, Hippokration Hospital, Third Department of Pediatrics, Konstantinoupoleos 49, GR-54642 Thessaloniki, Greece
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23
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Suzuki T, Uno T, Chen G, Ohashi Y. Ocular distribution of intravenously administered micafungin in rabbits. J Infect Chemother 2008; 14:204-7. [PMID: 18574655 DOI: 10.1007/s10156-008-0612-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2007] [Accepted: 03/13/2008] [Indexed: 11/28/2022]
Abstract
The ocular distribution of micafungin (MCFG), which has antifungal activity against Candida and Aspergillus species, was followed after the systemic administration of MCFG in rabbits. After MCFG (10 mg/kg) plus fluconazole (FLCZ; 10 mg/kg) was administered intravenously, the rabbits were killed, and MCFG and FLCZ concentrations in retina-choroid, vitreous humor, and plasma were determined by high performance liquid chromatography or liquid chromatography/mass spectrometry. The mean concentrations of MCFG in the retina-choroid at 0.25, 0.75, 4, 8, and 24 h after administration were 20.18, 15.97, 13.19, 6.27, and 0.75 microg/g, respectively, and were comparable with the MCFG plasma concentrations. The MCFG concentrations in retina-choroid and plasma exceeded the minimal antifungal inhibitory concentrations for endophthalmitis, although MCFG was not detected in the vitreous humor. These results suggest that the intravenous administration of MCFG is an effective treatment for endogenous fungal endophthalmitis when the causative fungus is localized in the retina and choroid.
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Affiliation(s)
- Takashi Suzuki
- Department of Ophthalmology, Ehime University School of Medicine, Ehime, Japan.
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24
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Carrillo-Muñoz AJ, Quindós G, del Valle O, Santos P, Giusiano G, Ezkurra PA, Estivill MD, Casals JB. Activity of caspofungin and voriconazole against clinical isolates of Candida and other medically important yeasts by the CLSI M-44A disk diffusion method with Neo-Sensitabs tablets. Chemotherapy 2007; 54:38-42. [PMID: 18073469 DOI: 10.1159/000112414] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2006] [Accepted: 02/25/2007] [Indexed: 11/19/2022]
Abstract
In vitro activity of caspofungin and voriconazole against 184 clinical isolates of Candida and other medically important yeasts in comparison with that of fluconazole, ketoconazole, itraconazole and amphotericin B was determined by using a disk diffusion method (Neo-Sensitabs) standardized according to the recommendations of the CLSI documents M44-A and M44-S1 (same medium: Mueller-Hinton plus methylene blue; inoculum and minimal inhibitory concentration/zone breakpoints). Seventy-two percent of clinical isolates were susceptible to caspofungin, 23.6% showed an intermediate susceptibility (most of them were Candida parapsilosis) and 4.3% were resistant (values for Candida spp. were 71.2, 23.8 and 5%, respectively). For voriconazole, 96.7% of clinical isolates were susceptible and 3.3% were resistant (Candida spp.: 96 and 3.8%, respectively). Both caspofungin and voriconazole showed high activity against a wide variety of clinically important yeasts.
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Serena C, Rodríguez MM, Mariné M, Pastor FJ, Guarro J. Combined therapies in a murine model of blastoschizomycosis. Antimicrob Agents Chemother 2007; 51:2608-10. [PMID: 17452487 PMCID: PMC1913274 DOI: 10.1128/aac.00173-07] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In a murine model of blastoschizomycosis, amphotericin B combined with micafungin, flucytosine or voriconazole did not improve the efficacy of fluconazole. However, such combinations can constitute therapeutic options for those cases where fluconazole fails.
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Affiliation(s)
- Carolina Serena
- Unitat de Microbiologia, Facultat de Medicina i Ciències de la Salut, Universitat Rovira i Virgili, Reus, Spain
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26
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Khan ZU, Al-Sweih NA, Ahmad S, Al-Kazemi N, Khan S, Joseph L, Chandy R. Outbreak of fungemia among neonates caused by Candida haemulonii resistant to amphotericin B, itraconazole, and fluconazole. J Clin Microbiol 2007; 45:2025-7. [PMID: 17428940 PMCID: PMC1933024 DOI: 10.1128/jcm.00222-07] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The first outbreak of Candida haemulonii fungemia is described. The seven isolates from the blood of four neonates were identified by DNA sequencing of the ribosomal DNA. They were all resistant to amphotericin B, fluconazole, and itraconazole. This report highlights the emergence of C. haemulonii as an opportunistic pathogen in immunocompromised patients.
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Affiliation(s)
- Zia U Khan
- Department of Microbiology, Faculty of Medicine, Kuwait University, Safat 13110, Kuwait.
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