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Villar-Hernández R, Latorre I, Noguera-Julian A, Martínez-Planas A, Minguell L, Vallmanya T, Méndez M, Soriano-Arandes A, Baquero-Artigao F, Rodríguez-Molino P, Guillén-Martín S, Toro-Rueda C, De Souza-Galvão ML, Jiménez-Fuentes MÁ, Stojanovic Z, Sabriá J, Santos JR, Puig J, Domínguez-Álvarez M, Millet JP, Altet N, Galea Y, Muriel-Moreno B, García-García E, Bach-Griera M, Prat-Aymerich C, Julián E, Torrelles JB, Rodrigo C, Domínguez J. Development and Evaluation of an NTM-IGRA to Guide Pediatric Lymphadenitis Diagnosis. Pediatr Infect Dis J 2024; 43:278-285. [PMID: 38113520 DOI: 10.1097/inf.0000000000004211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
BACKGROUND Diagnosis of nontuberculous mycobacteria (NTM) infections remains a challenge. In this study, we describe the evaluation of an immunological NTM-interferon (IFN)-γ release assay (IGRA) that we developed using glycopeptidolipids (GPLs) as NTM-specific antigens. METHODS We tested the NTM-IGRA in 99 samples from pediatric patients. Seventy-five were patients with lymphadenitis: 25 were NTM confirmed, 45 were of unknown etiology but compatible with mycobacterial infection and 5 had lymphadenitis caused by an etiologic agent other than NTM. The remaining 24 samples were from control individuals without lymphadenitis (latently infected with M. tuberculosis , uninfected controls and active tuberculosis patients). Peripheral blood mononuclear cells were stimulated overnight with GPLs. Detection of IFN-γ producing cells was evaluated by enzyme-linked immunospot assay. RESULTS NTM culture-confirmed lymphadenitis patient samples had a significantly higher response to GPLs than the patients with lymphadenitis of unknown etiology but compatible with mycobacterial infection ( P < 0.001) and lymphadenitis not caused by NTM ( P < 0.01). We analyzed the response against GPLs in samples from unknown etiology lymphadenitis but compatible with mycobacterial infection cases according to the tuberculin skin test (TST) response, and although not statistically significant, those with a TST ≥5 mm had a higher response to GPLs when compared with the TST <5 mm group. CONCLUSIONS Stimulation with GPLs yielded promising results in detecting NTM infection in pediatric patients with lymphadenitis. Our results indicate that the test could be useful to guide the diagnosis of pediatric lymphadenitis. This new NTM-IGRA could improve the clinical handling of NTM-infected patients and avoid unnecessary misdiagnosis and treatments.
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Affiliation(s)
- Raquel Villar-Hernández
- From the Servei de Microbiologia, Hospital Universitari Germans Trias i Pujol, Institut d'Investigació Germans Trias i Pujol, Barcelona, Spain
- CIBER Enfermedades Respiratorias, CIBERES, Instituto de Salud Carlos III, Madrid, Spain
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Barcelona, Spain
- R&D Department, Genome Identification Diagnostics (GenID) GmbH, Strassberg, Germany
| | - Irene Latorre
- From the Servei de Microbiologia, Hospital Universitari Germans Trias i Pujol, Institut d'Investigació Germans Trias i Pujol, Barcelona, Spain
- CIBER Enfermedades Respiratorias, CIBERES, Instituto de Salud Carlos III, Madrid, Spain
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Antoni Noguera-Julian
- Malalties Infeccioses i Resposta Inflamatòria Sistèmica en Pediatria, Servei de Malalties Infeccioses i Patologia Importada, Institut de Recerca Sant Joan de Déu, Barcelona, Spain
- Red de Investigación Translacional en Infectología Pediátrica, RITIP, Madrid, Spain
- Departament de Cirurgia i Especialitats Medicoquirúrgiques, Universitat de Barcelona, Barcelona, Spain
- CIBER de Epidemiología y Salud Pública, CIBERESP, Instituto de Salud Carlos III, Madrid, Spain
| | - Aina Martínez-Planas
- Malalties Infeccioses i Resposta Inflamatòria Sistèmica en Pediatria, Servei de Malalties Infeccioses i Patologia Importada, Institut de Recerca Sant Joan de Déu, Barcelona, Spain
- Red de Investigación Translacional en Infectología Pediátrica, RITIP, Madrid, Spain
| | - Laura Minguell
- Department of Pediatrics, Hospital Universitari Arnau de Vilanova, Lleida, Spain
| | - Teresa Vallmanya
- Department of Pediatrics, Hospital Universitari Arnau de Vilanova, Lleida, Spain
| | - María Méndez
- Servei de Pediatria, Hospital Universitari Germans Trias i Pujol, Universitat Autónoma de Barcelona, Institut d'Investigació Germans Trias i Pujol
| | - Antoni Soriano-Arandes
- Paediatric Infectious Diseases and Immunodeficiencies Unit, Hospital Universitari Vall d'Hebron, Barcelona, Spain
| | - Fernando Baquero-Artigao
- Servicio de Pediatría, Enfermedades Infecciosas y Tropicales, Hospital Universitario de La Paz
- CIBER de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III
| | - Paula Rodríguez-Molino
- Servicio de Pediatría, Enfermedades Infecciosas y Tropicales, Hospital Universitario de La Paz
- CIBER de Enfermedades Infecciosas (CIBERINFEC), Instituto de Salud Carlos III
| | | | | | | | | | - Zoran Stojanovic
- CIBER Enfermedades Respiratorias, CIBERES, Instituto de Salud Carlos III, Madrid, Spain
- Servei de Pneumologia, Hospital Universitari Germans Trias i Pujol
| | - Josefina Sabriá
- Servei de Pneumologia, Hospital Sant Joan Despí Moises Broggi, Sant Joan Despí, Barcelona, Spain
| | - José Ramón Santos
- Fundació Lluita contra les Infeccions, Servicio de Enfermedades Infecciosas, Hospital Universitari Germans Trias i Pujol, Badalona, Spain
| | - Jordi Puig
- Fundació Lluita contra les Infeccions, Servicio de Enfermedades Infecciosas, Hospital Universitari Germans Trias i Pujol, Badalona, Spain
| | | | - Joan-Pau Millet
- CIBER de Epidemiología y Salud Pública, CIBERESP, Instituto de Salud Carlos III, Madrid, Spain
- Unidad Clínica de Tratamiento Directamente Observado "Serveis Clinics," Barcelona, Spain
| | - Neus Altet
- CIBER de Epidemiología y Salud Pública, CIBERESP, Instituto de Salud Carlos III, Madrid, Spain
- Unidad Clínica de Tratamiento Directamente Observado "Serveis Clinics," Barcelona, Spain
| | - Yolanda Galea
- Servei de Pneumologia, Hospital General de Granollers, Granollers, Spain
| | - Beatriz Muriel-Moreno
- From the Servei de Microbiologia, Hospital Universitari Germans Trias i Pujol, Institut d'Investigació Germans Trias i Pujol, Barcelona, Spain
- CIBER Enfermedades Respiratorias, CIBERES, Instituto de Salud Carlos III, Madrid, Spain
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Esther García-García
- From the Servei de Microbiologia, Hospital Universitari Germans Trias i Pujol, Institut d'Investigació Germans Trias i Pujol, Barcelona, Spain
- CIBER Enfermedades Respiratorias, CIBERES, Instituto de Salud Carlos III, Madrid, Spain
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Marc Bach-Griera
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Cristina Prat-Aymerich
- From the Servei de Microbiologia, Hospital Universitari Germans Trias i Pujol, Institut d'Investigació Germans Trias i Pujol, Barcelona, Spain
- CIBER Enfermedades Respiratorias, CIBERES, Instituto de Salud Carlos III, Madrid, Spain
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Barcelona, Spain
- Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - Esther Julián
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Jordi B Torrelles
- Population Health Program, Texas Biomedical Research Institute, San Antonio, Texas
| | - Carlos Rodrigo
- Servei de Pediatria, Hospital Universitari Germans Trias i Pujol, Universitat Autónoma de Barcelona, Institut d'Investigació Germans Trias i Pujol
| | - José Domínguez
- From the Servei de Microbiologia, Hospital Universitari Germans Trias i Pujol, Institut d'Investigació Germans Trias i Pujol, Barcelona, Spain
- CIBER Enfermedades Respiratorias, CIBERES, Instituto de Salud Carlos III, Madrid, Spain
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Barcelona, Spain
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McManus WR, Schorey JS. Comparison of Ultrastructure, Extracellular Matrix, and Drug Susceptibility in M. avium subs. hominissuis Biofilms. Pathogens 2023; 12:1427. [PMID: 38133310 PMCID: PMC10747021 DOI: 10.3390/pathogens12121427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/28/2023] [Accepted: 12/06/2023] [Indexed: 12/23/2023] Open
Abstract
Pulmonary infections with Mycobacterium avium occur in susceptible individuals following exposure to the bacterium in the environment, where it often persists in biofilms. Many methods have been used to generate biofilms of M. avium, and it is unknown whether different approaches generate similar structures and cell phenotypes. To make a parallel comparison of in vitro biofilm ultrastructure, extracellular matrix (ECM) composition, and the drug susceptibility of biofilm resident bacteria, we used two published methods to generate M. avium biofilms: four-week incubation in M63 medium or 24 h exposure to dithiothreitol (DTT). Scanning electron microscopy revealed differences in the biofilm ultrastructure between the two methods, including variation in the appearance of ECM materials and morphology of resident cells, while light microscopy and staining with calcofluor white indicated that both biofilms contained polysaccharides characteristic of cellulose. Measuring the susceptibility of biofilms to degradation by enzymes suggested differences in structurally important ECM molecules, with DTT biofilms having important protein and, to a lesser extent, cellulose components, and M63 biofilms having moderate protein, cellulose, and DNA components. Both biofilms conferred resistance to the bactericidal effects of amikacin and clarithromycin, with resident cells being killed at greater than 10-fold lower rates than planktonic cells at almost all concentrations. These comparisons indicate differences in biofilm responses by M. avium under differing conditions, but also suggest common features of biofilm formation, including cellulose production and antimicrobial resistance.
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Affiliation(s)
| | - Jeffrey S. Schorey
- Department of Biological Sciences, Galvin Life Science Center, University of Notre Dame, Notre Dame, IN 46556, USA;
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Feizi S, Cooksley CM, Ramezanpour M, Nepal R, Psaltis AJ, Wormald PJ, Vreugde S. Colloidal silver against macrophage infections and biofilms of atypical mycobacteria. Biometals 2023; 36:913-925. [PMID: 36729280 PMCID: PMC10393856 DOI: 10.1007/s10534-023-00494-w] [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: 05/09/2022] [Accepted: 01/20/2023] [Indexed: 02/03/2023]
Abstract
Skin and soft tissue infection (SSTI) caused by atypical mycobacteria such as Mycobacterium abscessus and Mycobacterium avium intracellulare complex (MAIC) have increased in recent years. Current therapeutic options are limited, and hence new and better therapies are urgently required. Colloidal Silver (CS) has been identified for its widespread antibacterial properties and silver-impregnated dressings have been used for SSTIs caused by various pathogens. The efficacy of Green Synthesized Colloidal Silver (GSCS) was investigated for bacterial growth inhibition (BGI) using a microdilution method and minimum biofilm eradication concentration (MBEC) using resazurin assay and confocal scanning laser microscopy (CSLM) of M. abscessus (n = 5) and MAIC (n = 5). The antibacterial effect of GSCS against M. abscessus infected macrophages was also evaluated. The in vitro cytotoxicity of GSCS on a human keratinocyte cell line (HaCaT) and neonatal foreskin fibroblasts was analyzed by the crystal violet proliferation assay. Average BGI and MBEC of GSCS varied between 0.7 and 22 ppm for M. abscessus and MAIC. The concentration of 3 ppm reduced M. abscessus-infection in macrophages significantly. GSCS was not cytotoxic to HaCaT and neonatal foreskin fibroblast cells at concentrations < 3 ppm up to 2 h exposure time. GSCS therefore, has the potential for topical application against atypical mycobacterial SSTI.
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Affiliation(s)
- Sholeh Feizi
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, Australia
- The University of Adelaide, Adelaide, Australia
| | - Clare M Cooksley
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, Australia
- The University of Adelaide, Adelaide, Australia
| | - Mahnaz Ramezanpour
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, Australia
- The University of Adelaide, Adelaide, Australia
| | - Roshan Nepal
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, Australia
- The University of Adelaide, Adelaide, Australia
| | - Alkis J Psaltis
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, Australia
- The University of Adelaide, Adelaide, Australia
| | - Peter-John Wormald
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, Australia
- The University of Adelaide, Adelaide, Australia
| | - Sarah Vreugde
- Department of Surgery-Otolaryngology Head and Neck Surgery, Basil Hetzel Institute for Translational Health Research, Central Adelaide Local Health Network, Woodville South, Australia.
- The University of Adelaide, Adelaide, Australia.
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Wood PL, Erol E. Construction of a Bacterial Lipidomics Analytical Platform: Pilot Validation with Bovine Paratuberculosis Serum. Metabolites 2023; 13:809. [PMID: 37512516 PMCID: PMC10383236 DOI: 10.3390/metabo13070809] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/23/2023] [Accepted: 06/27/2023] [Indexed: 07/30/2023] Open
Abstract
Lipidomics analyses of bacteria offer the potential to detect and monitor infections in a host since many bacterial lipids are not present in mammals. To evaluate this omics approach, we first built a database of bacterial lipids for representative Gram-positive and Gram-negative bacteria. Our lipidomics analysis of the reference bacteria involved high-resolution mass spectrometry and electrospray ionization with less than a 1.0 ppm mass error. The lipidomics profiles of bacterial cultures clearly distinguished between Gram-positive and Gram-negative bacteria. In the case of bovine paratuberculosis (PTB) serum, we monitored two unique bacterial lipids that we also monitored in Mycobacterium avian subspecies PTB. These were PDIM-B C82, a phthiodiolone dimycocerosate, and the trehalose monomycolate hTMM 28:1, constituents of the bacterial cell envelope in mycolic-containing bacteria. The next step will be to determine if lipidomics can detect subclinical PTB infections which can last 2-to-4 years in bovine PTB. Our data further suggest that it will be worthwhile to continue building our bacterial lipidomics database and investigate the further utility of this approach in other infections of veterinary and human clinical interest.
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Affiliation(s)
- Paul L Wood
- Metabolomics Unit, College of Veterinary Medicine, Lincoln Memorial University, 6965 Cumberland Gap Pkwy, Harrogate, TN 37752, USA
| | - Erdal Erol
- Department of Veterinary Science, Veterinary Diagnostic Laboratory, University of Kentucky, Lexington, KY 40546, USA
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Chaudhary V, Pal AK, Singla M, Ghosh A. Elucidating the role of c-di-AMP in Mycobacterium smegmatis: Phenotypic characterization and functional analysis. Heliyon 2023; 9:e15686. [PMID: 37305508 PMCID: PMC10256829 DOI: 10.1016/j.heliyon.2023.e15686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 04/17/2023] [Accepted: 04/18/2023] [Indexed: 06/13/2023] Open
Abstract
Cyclic-di-AMP (c-di-AMP) is an important secondary messenger molecule that plays a critical role in monitoring several important cellular processes, especially in several Gram-positive bacteria. In this study, we seek to unravel the physiological significance of the molecule c-di-AMP in Mycobacterium smegmatis under different conditions, using strains with altered c-di-AMP levels: c-di-AMP null mutant (ΔdisA) and a c-di-AMP over-expression mutant (Δpde). Our thorough analysis of the mutants revealed that the intracellular concentration of c-di-AMP could determine many basic phenotypes such as colony architecture, cell shape, cell size, membrane permeability etc. Additionally, it was shown to play a significant role in multiple stress adaptation pathways in the case of different DNA and membrane stresses. Our study also revealed how the biofilm phenotypes of M. smegmatis cells are altered with high intracellular c-di-AMP concentration. Next, we checked how c-di-AMP contributes to antibiotic resistance or susceptibility characteristics of M. smegmatis, which was followed by a detailed transcriptome profile analysis to reveal key genes and pathways such as translation, arginine biosynthesis, cell wall and plasma membrane are regulated by c-di-AMP in mycobacteria.
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Molina-Torres C, Pedraza-Rodríguez C, Vera-Cabrera L, Ocampo-Candiani J, Rivas-Morales C, Viveros-Valdez E. Antimycobacterial Activity of Hedeoma drummondii against Mycobacterium tuberculosis and Non-Tuberculous Mycobacteria. Antibiotics (Basel) 2023; 12:antibiotics12050833. [PMID: 37237736 DOI: 10.3390/antibiotics12050833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/21/2023] [Accepted: 04/27/2023] [Indexed: 05/28/2023] Open
Abstract
Tuberculosis (TB) remains a major health problem worldwide, and the emergence of multi-resistant strains to first-line drugs has become the biggest obstacle to its treatment. On the other hand, the incidence of non-tuberculous mycobacteria (NTM) in humans has increased remarkably in recent years. The search for new and better treatments against mycobacterial infections is a constant at the global level. Hence, in this study, we propose to investigate the antimycobacterial effect of the extracts and major compounds of Hedeoma drummondii against clinical isolates of Mycobacterium tuberculosis and non-tuberculous mycobacteria: M. abscessus, M. fortuitum, M. intracellulare, and M. gordonae. To determine the antimycobacterial activity, a microdilution assay was used to establish the minimum inhibitory concentration (MIC) of the different strains of Mycobacterium. The methanolic extract presented the best activity against M. tuberculosis, inhibiting ten of the twelve strains analyzed at a concentration < 2500 µg/mL; meanwhile, the hexanic extract presented the best activity against non-tuberculous mycobacteria (NTM) by inhibiting eight of the ten strains studied at ≤625 µg/mL. Moreover, there is a strong positive correlation between the antimycobacterial activity of pulegone and the hexanic extract against non-tuberculous strains, so this compound could serve as a predictability marker against these types of microorganisms.
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Affiliation(s)
- Carmen Molina-Torres
- Servicios de Dermatología, Hospital Universitario "José E. González", Universidad Autónoma de Nuevo León (UANL), Madero y Gonzalitos, Col. Mitras Centro, Monterrey 66640, NL, Mexico
| | - Carlos Pedraza-Rodríguez
- Servicios de Dermatología, Hospital Universitario "José E. González", Universidad Autónoma de Nuevo León (UANL), Madero y Gonzalitos, Col. Mitras Centro, Monterrey 66640, NL, Mexico
- Facultad de Ciencias Biológicas (FCB), Universidad Autónoma de Nuevo León (UANL), Av. Pedro de Alba s/n, San Nicolás de los Garza 66450, NL, Mexico
| | - Lucio Vera-Cabrera
- Servicios de Dermatología, Hospital Universitario "José E. González", Universidad Autónoma de Nuevo León (UANL), Madero y Gonzalitos, Col. Mitras Centro, Monterrey 66640, NL, Mexico
| | - Jorge Ocampo-Candiani
- Servicios de Dermatología, Hospital Universitario "José E. González", Universidad Autónoma de Nuevo León (UANL), Madero y Gonzalitos, Col. Mitras Centro, Monterrey 66640, NL, Mexico
| | - Catalina Rivas-Morales
- Facultad de Ciencias Biológicas (FCB), Universidad Autónoma de Nuevo León (UANL), Av. Pedro de Alba s/n, San Nicolás de los Garza 66450, NL, Mexico
| | - Ezequiel Viveros-Valdez
- Facultad de Ciencias Biológicas (FCB), Universidad Autónoma de Nuevo León (UANL), Av. Pedro de Alba s/n, San Nicolás de los Garza 66450, NL, Mexico
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Thouvenel L, Rech J, Guilhot C, Bouet JY, Chalut C. In vivo imaging of MmpL transporters reveals distinct subcellular locations for export of mycolic acids and non-essential trehalose polyphleates in the mycobacterial outer membrane. Sci Rep 2023; 13:7045. [PMID: 37120636 PMCID: PMC10148836 DOI: 10.1038/s41598-023-34315-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 04/27/2023] [Indexed: 05/01/2023] Open
Abstract
The mycobacterial cell envelope consists of a typical plasma membrane, surrounded by a complex cell wall and a lipid-rich outer membrane. The biogenesis of this multilayer structure is a tightly regulated process requiring the coordinated synthesis and assembly of all its constituents. Mycobacteria grow by polar extension and recent studies showed that cell envelope incorporation of mycolic acids, the major constituent of the cell wall and outer membrane, is coordinated with peptidoglycan biosynthesis at the cell poles. However, there is no information regarding the dynamics of incorporation of other families of outer membrane lipids during cell elongation and division. Here, we establish that the translocation of non-essential trehalose polyphleates (TPP) occurs at different subcellular locations than that of the essential mycolic acids. Using fluorescence microscopy approaches, we investigated the subcellular localization of MmpL3 and MmpL10, respectively involved in the export of mycolic acids and TPP, in growing cells and their colocalization with Wag31, a protein playing a critical role in regulating peptidoglycan biosynthesis in mycobacteria. We found that MmpL3, like Wag31, displays polar localization and preferential accumulation at the old pole whereas MmpL10 is more homogenously distributed in the plasma membrane and slightly accumulates at the new pole. These results led us to propose a model in which insertion of TPP and mycolic acids into the mycomembrane is spatially uncoupled.
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Affiliation(s)
- Laurie Thouvenel
- Institut de Pharmacologie et de Biologie Structurale, Université de Toulouse, CNRS, UPS, Toulouse, France
- de Duve Institute, UCLouvain, Brussels, Belgium
| | - Jérôme Rech
- Laboratoire de Microbiologie et Génétique Moléculaires, Centre de Biologie Intégrative de Toulouse, CNRS, Université de Toulouse, UPS, Toulouse, France
| | - Christophe Guilhot
- Institut de Pharmacologie et de Biologie Structurale, Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Jean-Yves Bouet
- Laboratoire de Microbiologie et Génétique Moléculaires, Centre de Biologie Intégrative de Toulouse, CNRS, Université de Toulouse, UPS, Toulouse, France
| | - Christian Chalut
- Institut de Pharmacologie et de Biologie Structurale, Université de Toulouse, CNRS, UPS, Toulouse, France.
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Alkarni M, Lipman M, Lowe DM. The roles of neutrophils in non-tuberculous mycobacterial pulmonary disease. Ann Clin Microbiol Antimicrob 2023; 22:14. [PMID: 36800956 PMCID: PMC9938600 DOI: 10.1186/s12941-023-00562-6] [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: 10/07/2022] [Accepted: 01/30/2023] [Indexed: 02/19/2023] Open
Abstract
Non-tuberculous Mycobacterial Pulmonary Disease (NTM-PD) is an increasingly recognised global health issue. Studies have suggested that neutrophils may play an important role in controlling NTM infection and contribute to protective immune responses within the early phase of infection. However, these cells are also adversely associated with disease progression and exacerbation and can contribute to pathology, for example in the development of bronchiectasis. In this review, we discuss the key findings and latest evidence regarding the diverse functions of neutrophils in NTM infection. First, we focus on studies that implicate neutrophils in the early response to NTM infection and the evidence reporting neutrophils' capability to kill NTM. Next, we present an overview of the positive and negative effects that characterise the bidirectional relationship between neutrophils and adaptive immunity. We consider the pathological role of neutrophils in driving the clinical phenotype of NTM-PD including bronchiectasis. Finally, we highlight the current promising treatments in development targeting neutrophils in airways diseases. Clearly, more insights on the roles of neutrophils in NTM-PD are needed in order to inform both preventative strategies and host-directed therapy for these important infections.
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Affiliation(s)
- Meyad Alkarni
- grid.83440.3b0000000121901201Institute of Immunity and Transplantation, University College London, Pears Building, Rowland Hill Street, London, NW3 2PP UK
| | - Marc Lipman
- grid.83440.3b0000000121901201UCL Respiratory, University College London, London, UK
| | - David M. Lowe
- grid.83440.3b0000000121901201Institute of Immunity and Transplantation, University College London, Pears Building, Rowland Hill Street, London, NW3 2PP UK
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Muñoz-Egea MC, Akir A, Esteban J. Mycobacterium biofilms. Biofilm 2023; 5:100107. [PMID: 36798742 PMCID: PMC9925856 DOI: 10.1016/j.bioflm.2023.100107] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 02/01/2023] [Accepted: 02/06/2023] [Indexed: 02/10/2023] Open
Abstract
The genus Mycobacterium includes some of the deadliest pathogens of History (Mycobacterium tuberculosis, Mycobacterium leprae), but most of the species within the genus are environmental microorganisms. Because some of these nontuberculous mycobacteria (NTM) species can be human pathogens, the study of these mycobacterial biofilms has increased during the last decades, and the interest in this issue increased as well as the growing number of patients with diseases caused by NTM. Different molecular mechanisms have been described, being especially well known the importance of glycopeptidolipids. Moreover, the knowledge of the extracellular matrix has shown important differences with other microorganisms, especially because of the presence of lipidic molecules as a key component of this structure. The clinical importance of mycobacterial biofilms has been described for many chronic diseases, especially lung diseases and implant-related ones, both in vitro and in vivo, and even in patients. Moreover, the biofilm-producing capacity has been proven also in M. tuberculosis, while its importance is not well understood. Biofilm studies have also shown the increasing resistance of mycobacteria in sessile form, and the importance of this resistance in the management of the patients is beyond doubt, being surgery necessary in some cases to cure the patients. Diagnosis of mycobacterial diseases is still based on culture-based techniques designed for the detection of M. tuberculosis. Molecular biology-based methods are also broadly used but again designed for tuberculosis diagnosis. Antimicrobial susceptibility testing is also well developed for tuberculosis, but only some species of NTM have standardized techniques for this purpose. New tools or approaches are necessary to treat these patients, whose importance is increasing, as the number of potential hosts is also increasing throughout the world.
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Affiliation(s)
- Maria-Carmen Muñoz-Egea
- Department of Clinical Microbiology, IIS-Fundación Jiménez Díaz, UAM, Av. Reyes Católicos 2, 28040, Madrid, Spain,CIBERINFEC - CIBER de Enfermedades Infecciosas, Madrid, Spain
| | - Arij Akir
- Department of Clinical Microbiology, IIS-Fundación Jiménez Díaz, UAM, Av. Reyes Católicos 2, 28040, Madrid, Spain
| | - Jaime Esteban
- Department of Clinical Microbiology, IIS-Fundación Jiménez Díaz, UAM, Av. Reyes Católicos 2, 28040, Madrid, Spain,CIBERINFEC - CIBER de Enfermedades Infecciosas, Madrid, Spain,Corresponding author. Dept. of Clinical Microbiology, IIS-Fundacion Jimenez Diaz, UAM. Av. Reyes Católicos 2, 28040, Madrid, Spain.
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10
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Wani SR, Dubey AA, Jain V. Ms6244 is a novel Mycobacterium smegmatis TetR family transcriptional repressor that regulates cell growth and morphophysiology. FEBS Lett 2023; 597:1428-1440. [PMID: 36694284 DOI: 10.1002/1873-3468.14582] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 01/02/2023] [Accepted: 01/04/2023] [Indexed: 01/26/2023]
Abstract
Transcriptional factors such as the TetR family of transcriptional regulators (TFTRs) are widely found amongst bacteria, including mycobacteria, and are accountable for their survival. Here, we characterized a novel TFTR, Ms6244, from Mycobacterium smegmatis that negatively autoregulates its expression and represses its neighbouring gene, Ms6243. We also report the binding of Ms6244 to the inverted repeats in the intergenic region of Ms6244 and Ms6243. Further, an Ms6244-deleted strain shows various morpho-physiological differences compared to the wild type. We further confirmed that the deletion of Ms6244 itself and not the resultant Ms6243 overexpression is the cause of the altered physiology. Our data thus suggest that Ms6244 is an essential regulator, having far-reaching effects on M. smegmatis physiology.
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Affiliation(s)
- Saloni Rajesh Wani
- Microbiology and Molecular Biology Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Bhopal, India
| | - Abhishek Anil Dubey
- Microbiology and Molecular Biology Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Bhopal, India
| | - Vikas Jain
- Microbiology and Molecular Biology Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Bhopal, India
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11
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Ratna S, Daniel J. Stress-induced non-replicating Mycobacterium smegmatis incorporates exogenous fatty acids into glycopeptidolipids. Microb Pathog 2023; 174:105943. [PMID: 36502992 DOI: 10.1016/j.micpath.2022.105943] [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: 08/09/2022] [Revised: 11/03/2022] [Accepted: 12/08/2022] [Indexed: 12/13/2022]
Abstract
Nontuberculous mycobacteria (NTM) such as Mycobacterium smegmatis accumulate high levels of glycopeptidolipids (GPLs) on their outer surface. The biosynthesis of GPLs is critically linked to biofilm formation by NTM which also includes opportunistic pathogens such as Mycobacterium abscessus. Although GPLs have been investigated in many earlier studies, the biosynthesis of GPLs using exogenous fatty acids in M. smegmatis subjected to stresses encountered by mycobacteria during infection of the human body has not been studied. Therefore, we subjected M. smegmatis to different combinations of the three stresses of hypoxia, acidic pH and nutrient starvation and report here that the metabolic incorporation of radiolabeled long-chain fatty acids into alkali-stable GPLs was significantly increased under these stress conditions. Endogenously synthesized fatty acids were not preferred for GPL biosynthesis by M. smegmatis subjected to the triple stress combination. Our observations indicate that GPLs may play important roles in cell surface modifications associated with the non-replicating state of M. smegmatis. Our experimental model reported here would be useful in the further study of GPL biosynthesis from exogenous fatty acid sources in M. smegmatis subjected to hypoxia, nutrient starvation and acidic stress conditions and help in the screening of candidate drugs that target this biochemical pathway in pathogenic NTM.
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Affiliation(s)
- Sushanta Ratna
- Department of Biological Sciences, Purdue University Fort Wayne, Fort Wayne, IN, 46805, USA
| | - Jaiyanth Daniel
- Department of Biological Sciences, Purdue University Fort Wayne, Fort Wayne, IN, 46805, USA.
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12
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Hendrix C, McCrary M, Hou R, Abate G. Diagnosis and Management of Pulmonary NTM with a Focus on Mycobacterium avium Complex and Mycobacterium abscessus: Challenges and Prospects. Microorganisms 2022; 11:microorganisms11010047. [PMID: 36677340 PMCID: PMC9861392 DOI: 10.3390/microorganisms11010047] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/15/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Nontuberculous mycobacteria (NTM) are ubiquitous. NTM can affect different organs and may cause disseminated diseases, but the pulmonary form is the most common form. Pulmonary NTM is commonly seen in patients with underlying diseases. Pulmonary Mycobacterium avium complex (MAC) is the most common NTM disease and M. abscessus (MAB) is the most challenging to treat. This review is prepared with the following objectives: (a) to evaluate new methods available for the diagnosis of pulmonary MAC or MAB, (b) to assess advances in developing new therapeutics and their impact on treatment of pulmonary MAC or MAB, and (c) to evaluate the prospects of preventive strategies including vaccines against pulmonary MAC or MAB. METHODS A literature search was conducted using PubMed/MEDLINE and multiple search terms. The search was restricted to the English language and human studies. The database query resulted in a total of 197 publications. After the title and abstract review, 64 articles were included in this analysis. RESULTS The guidelines by the American Thoracic Society (ATS), European Respiratory Society (ERS), European Society of Clinical Microbiology and Infectious Diseases (ESCMID), and Infectious Diseases Society of America (IDSA) are widely applicable. The guidelines are based on expert opinion and there may be a need to broaden criteria to include those with underlying lung diseases who may not fulfill some of the criteria as 'probable cases' for better follow up and management. Some cases with only one culture-positive sputum sample or suggestive histology without a positive culture may benefit from new methods of confirming NTM infection. Amikacin liposomal inhalation suspension (ALIS), gallium containing compounds and immunotherapies will have potential in the management of pulmonary MAC and MAB. CONCLUSIONS the prevalence of pulmonary NTM is increasing. The efforts to optimize diagnosis and treatment of pulmonary NTM are encouraging. There is still a need to develop new diagnostics and therapeutics.
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13
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Hernandez AG, Brunton AE, Ato M, Morimoto K, Machida S, Henkle E, Winthrop KL. Use of Anti-Glycopeptidolipid-Core Antibodies Serology for Diagnosis and Monitoring of Mycobacterium avium Complex Pulmonary Disease in the United States. Open Forum Infect Dis 2022; 9:ofac528. [PMID: 36349274 PMCID: PMC9636853 DOI: 10.1093/ofid/ofac528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 10/20/2022] [Indexed: 11/06/2022] Open
Abstract
Background There is an unmet need for rapid, accurate, and noninvasive assays for diagnosis and monitoring of Mycobacterium avium complex pulmonary disease (MAC-PD). We evaluated the diagnostic accuracy of an anti-glycopeptidolipid (GPL)-core immunoglobulin A (IgA) antibody test in a US cohort of MAC patients, and we described serial serology changes during antimicrobial therapy. Methods We identified serum samples from MAC patients starting treatment at enrollment and control subjects with or without bronchiectasis within OHSU's NTM Biobank. We conducted diagnostic test accuracy. Changes in mean levels of anti-GPL-core IgA antibodies between 0 and 3, 6, or 12 months after treatment start were assessed using the Student's paired t test. Pearson's correlation coefficient was calculated for IgA antibody levels and Student paired t test measures. Results We included 25 MAC patients and 18 controls. At baseline, IgA antibody concentrations in MAC patients (3.40 ± 6.77 U/mL) were significantly higher than in controls without bronchiectasis (0.14 ± 0.03 U/mL, P = .02). Sensitivity and specificity for MAC-PD in this population was 48% and 89% (cutoff point 0.7 U/mL), respectively. Among MAC patients starting antimicrobial therapy, mean IgA levels decreased 0.3202 U/mL (P = .86) at month 3, 0.8678 U/mL (P = .47) at month 6, and 1.9816 U/mL (P = .41) at 1 year. Quality of Life-Bronchiectasis Respiratory Symptom Scale improvement correlated with decreasing IgA titers after 12 months of treatment in MAC patients (r = −0.50, P = .06). Conclusions Anti-GPL-core IgA antibody levels are relatively specific for MAC-PD and decrease with treatment. Larger studies are warranted to evaluate the role of IgA serology in monitoring treatment response or for disease relapse/reinfection.
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Affiliation(s)
- A G Hernandez
- Center for Infectious Disease Studies, School of Public Health, Oregon Health & Science University , Portland, Oregon , USA
| | - A E Brunton
- Center for Infectious Disease Studies, School of Public Health, Oregon Health & Science University , Portland, Oregon , USA
| | - M Ato
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases , Aoba-cho, Higashimurayama, Tokyo , Japan
| | - K Morimoto
- Respiratory Disease Center, Fukujuji Hospital, Japan Anti-Tuberculosis Association , Matsuyama, Kiyose City, Tokyo , Japan
| | - S Machida
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases , Aoba-cho, Higashimurayama, Tokyo , Japan
| | - E Henkle
- Center for Infectious Disease Studies, School of Public Health, Oregon Health & Science University , Portland, Oregon , USA
| | - K L Winthrop
- Center for Infectious Disease Studies, School of Public Health, Oregon Health & Science University , Portland, Oregon , USA
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14
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Iwasaki T, Yamaguchi F, Hayashi M, Kobayashi H, Hirata K, Miyo K, Kondo C, Kanzaki M, Tei K, Abe T, Sakakura S, Inoue D, Yamazaki Y, Tateno H, Yokoe T, Shikama Y. Combination of anti-glycopeptidolipid-core IgA antibody and clinical features for diagnosing potential nontuberculous mycobacterium pulmonary disease in routine practice. Ther Adv Respir Dis 2022; 16:17534666221138002. [DOI: 10.1177/17534666221138002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Background: The anti- Mycobacterium avium complex (MAC) antibody test measures levels of IgA antibody against the glycopeptidolipid (GPL) core in the bacterial cell walls and is a useful clinical indicator of nontuberculous mycobacterium pulmonary disease (NTM-PD). However, it is not currently possible to diagnose the disease using anti-MAC antibodies alone. Objectives: The study aim was to assess the efficacy of the combination of anti-MAC antibodies and clinical findings for diagnosing potential NTM-PD. Methods: This cross-sectional study included 938 patients tested using the anti-MAC antibody. NTM-PD was diagnosed by multiple positive cultures of the same species in sputum samples. Multivariate logistic regression models were used to identify the clinical factors related to NTM-PD. Results: Overall, 19.6% (184/938) of participants were diagnosed with NTM-PD. In multivariate analysis, positive anti-MAC antibodies, low body mass index, absence of malignancy, and cavity-forming lung lesions were significantly associated with NTM-PD at diagnosis. The positive rates of the anti-MAC antibody test were 79.4% (135/170) for MAC and 55.6% (5/9) for Mycobacterium abscessus complex, respectively. Conclusions: Bronchoscopic examinations should be performed especially in certain types of individuals from whom sputum samples cannot be obtained. Anti-MAC antibodies are also positive in patients other than those harboring MAC, but the rate may be low because of the different components in GPLs.
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Affiliation(s)
- Takuya Iwasaki
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Fumihiro Yamaguchi
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, 1-30 Fujigaoka, Aoba-ku, Yokohama 227-8501, Japan
| | - Makoto Hayashi
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
- Respiratory Disease Center, Showa University Northern Yokohama Hospital, Yokohama-shi, Japan
| | - Hitoshi Kobayashi
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Kento Hirata
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Kenta Miyo
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Chika Kondo
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Mamiko Kanzaki
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Kazusawa Tei
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Takashi Abe
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Shunsuke Sakakura
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Daisuke Inoue
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Yohei Yamazaki
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Hidetsugu Tateno
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Takuya Yokoe
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
| | - Yusuke Shikama
- Department of Respiratory Medicine, Showa University Fujigaoka Hospital, Yokohama, Japan
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Dokic A, Peterson E, Arrieta-Ortiz ML, Pan M, Di Maio A, Baliga N, Bhatt A. Mycobacterium abscessus biofilms produce an extracellular matrix and have a distinct mycolic acid profile. Cell Surf 2021; 7:100051. [PMID: 33912773 PMCID: PMC8066798 DOI: 10.1016/j.tcsw.2021.100051] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 03/25/2021] [Accepted: 03/26/2021] [Indexed: 02/06/2023] Open
Abstract
A non-tuberculous mycobacterium, Mycobacterium abscessus is an emerging opportunistic pathogen associated with difficult to treat pulmonary infections, particularly in patients suffering from cystic fibrosis. It is capable of forming biofilms in vitro that result in an increase of already high levels of antibiotic resistance in this bacterium. Evidence that M. abscessus forms biofilm-like microcolonies in patient lungs and on medical devices further implicated the need to investigate this biofilm in detail. Therefore, in this study we characterized the M. abscessus pellicular biofilm, formed on a liquid-air interface, by studying its molecular composition, and its transcriptional profile in comparison to planktonic cells. Using scanning electron micrographs and fluorescence microscopy, we showed that M. abscessus biofilms produce an extracellular matrix composed of lipids, proteins, carbohydrates and extracellular DNA. Transcriptomic analysis of biofilms revealed an upregulation of pathways involved in the glyoxylate shunt, redox metabolism and mycolic acid biosynthesis. Genes involved in elongation and desaturation of mycolic acids were highly upregulated in biofilms and, mirroring those findings, biochemical analysis of mycolates revealed molecular changes and an increase in mycolic acid chain length. Together these results give us an insight into the complex structure of M. abscessus biofilms, the understanding of which may be adapted for clinical use in treatment of biofilm infections, including strategies for dispersing the extracellular matrix, allowing antibiotics to gain access to bacteria within the biofilm.
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Affiliation(s)
- Anja Dokic
- School of Biosciences and Institute of Microbiology and Infection, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | | | | | - Min Pan
- Institute for Systems Biology, Seattle, WA 98109 USA
| | - Alessandro Di Maio
- School of Biosciences and Institute of Microbiology and Infection, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Nitin Baliga
- Institute for Systems Biology, Seattle, WA 98109 USA
| | - Apoorva Bhatt
- School of Biosciences and Institute of Microbiology and Infection, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
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16
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Gupta KR, Arora G, Mattoo A, Sajid A. Stringent Response in Mycobacteria: From Biology to Therapeutic Potential. Pathogens 2021; 10:pathogens10111417. [PMID: 34832573 PMCID: PMC8622095 DOI: 10.3390/pathogens10111417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/18/2021] [Accepted: 10/26/2021] [Indexed: 01/16/2023] Open
Abstract
Mycobacterium tuberculosis is a human pathogen that can thrive inside the host immune cells for several years and cause tuberculosis. This is due to the propensity of M. tuberculosis to synthesize a sturdy cell wall, shift metabolism and growth, secrete virulence factors to manipulate host immunity, and exhibit stringent response. These attributes help M. tuberculosis to manage the host response, and successfully establish and maintain an infection even under nutrient-deprived stress conditions for years. In this review, we will discuss the importance of mycobacterial stringent response under different stress conditions. The stringent response is mediated through small signaling molecules called alarmones “(pp)pGpp”. The synthesis and degradation of these alarmones in mycobacteria are mediated by Rel protein, which is both (p)ppGpp synthetase and hydrolase. Rel is important for all central dogma processes—DNA replication, transcription, and translation—in addition to regulating virulence, drug resistance, and biofilm formation. Rel also plays an important role in the latent infection of M. tuberculosis. Here, we have discussed the literature on alarmones and Rel proteins in mycobacteria and highlight that (p)ppGpp-analogs and Rel inhibitors could be designed and used as antimycobacterial compounds against M. tuberculosis and non-tuberculous mycobacterial infections.
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Affiliation(s)
| | - Gunjan Arora
- Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, USA;
| | - Abid Mattoo
- Pharmaceutical Development, Ultragenyx Gene Therapy, Woburn, MA 01801, USA;
| | - Andaleeb Sajid
- Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, USA;
- Correspondence: or
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17
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Identification of putative microRNAs in the complete genome of Mycobacterium avium and their possible interaction with human transcripts. J Appl Genet 2021; 63:169-182. [PMID: 34677783 DOI: 10.1007/s13353-021-00666-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Revised: 08/05/2021] [Accepted: 10/14/2021] [Indexed: 10/20/2022]
Abstract
The grievous adversity regarding Mycobacterium avium is its ubiquitous nature. Isolation of the bacteria from drinking water, house dust, and soil, etc., is an alarming issue for the scientific community. The microRNAs are the molecular influencers of gene expression that act during the process of post transcription. A few reports claimed the existence of microRNAs or microRNA-like molecules in the prokaryotic species. Biogenesis of bacterial miRNAs requires their transport into the host cell. Subsequently, the host-encoded enzymes are exerted for the formation of bacterial mature miRNAs and their regulation. In our study, the screening of complete genome of Mycobacterium avium revealed six putative precursor microRNA sequences bearing typical secondary structures. The mature microRNAs were predicted in both arms of the secondary structures. A total of 12 possible mature microRNAs were identified in this study. The likely targets of the predicted mature miRNAs were searched in human 3' UTR. In the human transcriptome, 193 genes were possibly targeted by 12 mature miRNAs of Mycobacterium avium. The essential functionalities of the target genes included signal transduction, immune system, DNA binding, and response to stress.
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18
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Fukushima K, Kitada S, Matsumoto Y, Komukai S, Kuge T, Kawasaki T, Matsuki T, Motooka D, Tsujino K, Miki M, Miki K, Nakamura S, Kida H. Serum GPL core antibody levels are associated with disease activity and treatment outcomes in Mycobacterium avium complex lung disease following first line antibiotic treatment. Respir Med 2021; 187:106585. [PMID: 34455309 DOI: 10.1016/j.rmed.2021.106585] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 07/29/2021] [Accepted: 08/23/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND No objective serum biomarkers of disease course or treatment outcome of Mycobacterium avium complex lung disease (MAC-LD) presently exist. Serum IgA antibody levels against the glycopeptidolipid (GPL) core have good diagnostic accuracy for MAC-LD. However, their usefulness for monitoring and predicting disease course and outcome of MAC-LD following first-line antibiotic treatment remains unclear. METHODS We conducted a single-center retrospective cohort study to investigate the utility of serial measurements of GPL core IgA antibodies for monitoring disease course in 133 patients with MAC-LD following first-line antibiotic treatment. RESULTS Patients were classified into treatment failure [n = 46 (34.6%)], recurrence [n = 19 (14.3%)], or treatment success [n = 68 (51.1%)] groups according to bacteriological outcomes after chemotherapy. Pretreatment serum anti-GPL core IgA levels in the treatment success group were similar to those in the treatment failure and recurrence groups (P = 0.6431 and P = 0.9045, respectively). In the treatment success group, serum anti-GPL core IgA levels were significantly and continuously reduced after initiating antibiotic treatment. No significant reductions in anti-GPL core IgA levels were observed in either the treatment failure or recurrence groups. Reduced levels of GPL core antibodies following antibiotic treatment correlated well with treatment outcomes (P = 0.0045). CONCLUSION In this study, by performing serial measurements, we found that GPL core antibody levels were associated with disease activity and treatment outcomes in patients with MAC-LD. Time course analysis of anti-GPL core IgA levels clearly differentiated between patients who achieved treatment success and those who experienced treatment failure or disease recurrence.
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Affiliation(s)
- Kiyoharu Fukushima
- Department of Respiratory Medicine, National Hospital Organization, Osaka Toneyama Medical Centre, 5-1-1 Toneyama, Toyonaka, Osaka, Japan; Department of Respiratory Medicine and Clinical Immunology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, Japan.
| | - Seigo Kitada
- Department of Respiratory Medicine, Yao Tokushukai General Hospital, 1-17 Wakakusa-cho, Yao, Osaka, Japan
| | - Yuki Matsumoto
- Department of Infection Metagenomics, Genome Information Research Center, Research Institute for Microbial Diseases (RIMD), Osaka University, 3-1 Yamadaoka, Suita, Osaka, Japan
| | - Sho Komukai
- Department of Biomedical Statistics, Graduate School of Medicine, Osaka University, Osaka, Japan; Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Osaka, Japan
| | - Tomoki Kuge
- Department of Respiratory Medicine, National Hospital Organization, Osaka Toneyama Medical Centre, 5-1-1 Toneyama, Toyonaka, Osaka, Japan
| | - Takahiro Kawasaki
- Department of Respiratory Medicine, National Hospital Organization, Osaka Toneyama Medical Centre, 5-1-1 Toneyama, Toyonaka, Osaka, Japan
| | - Takanori Matsuki
- Department of Respiratory Medicine, National Hospital Organization, Osaka Toneyama Medical Centre, 5-1-1 Toneyama, Toyonaka, Osaka, Japan
| | - Daisuke Motooka
- Department of Infection Metagenomics, Genome Information Research Center, Research Institute for Microbial Diseases (RIMD), Osaka University, 3-1 Yamadaoka, Suita, Osaka, Japan
| | - Kazuyuki Tsujino
- Department of Respiratory Medicine, National Hospital Organization, Osaka Toneyama Medical Centre, 5-1-1 Toneyama, Toyonaka, Osaka, Japan
| | - Mari Miki
- Department of Respiratory Medicine, National Hospital Organization, Osaka Toneyama Medical Centre, 5-1-1 Toneyama, Toyonaka, Osaka, Japan
| | - Keisuke Miki
- Department of Respiratory Medicine, National Hospital Organization, Osaka Toneyama Medical Centre, 5-1-1 Toneyama, Toyonaka, Osaka, Japan
| | - Shota Nakamura
- Department of Infection Metagenomics, Genome Information Research Center, Research Institute for Microbial Diseases (RIMD), Osaka University, 3-1 Yamadaoka, Suita, Osaka, Japan
| | - Hiroshi Kida
- Department of Respiratory Medicine, National Hospital Organization, Osaka Toneyama Medical Centre, 5-1-1 Toneyama, Toyonaka, Osaka, Japan
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19
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Algammal AM, Hashem HR, Al-Otaibi AS, Alfifi KJ, El-Dawody EM, Mahrous E, Hetta HF, El-Kholy AW, Ramadan H, El-Tarabili RM. Emerging MDR-Mycobacterium avium subsp. avium in house-reared domestic birds as the first report in Egypt. BMC Microbiol 2021; 21:237. [PMID: 34445951 PMCID: PMC8393820 DOI: 10.1186/s12866-021-02287-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 07/26/2021] [Indexed: 12/01/2022] Open
Abstract
Background Avian tuberculosis is a chronic and zoonotic disease that affects a wide variety of birds, mammals, and humans. This study aimed to estimate the frequency of Mycobacterium avium subsp. avium in some domestic birds based on molecular diagnosis, antibiogram profile, and PCR-based detection of inhA, rpoB, rpsL, and otrB antibiotic resistance-related genes. Methods A total of 120 fecal samples were collected from small flocks of house-reared domestic birds at Ismailia Governorate, Egypt. The collected samples were processed and subjected to the bacteriological examination. The antimicrobial susceptibility testing of the recovered isolates was performed using the broth microdilution method for the detection of minimum inhibitory concentrations (MICs). The genetic detection of the IS901confirmatory gene, inhA, rpoB, rpsL, and otrB genes was carried out using PCR. Results The frequency of M. avium subsp. avium was 4.1% (5/120); 10% (4/40) in ducks, and 2.5% (1/10) in geese. The identification of the recovered isolates was confirmed using PCR, where all the tested isolates were positive for IS901confirmatory gene. The results of the broth microdilution method revealed that most of the recovered isolates exhibited multidrug resistance (MDR) to isoniazid, rifampicin, streptomycin, oxytetracycline, and doxycycline, and harbored the inhA, rpoB, rpsL, and otrB genes. Conclusion In brief, to the best of our knowledge this is the first report that emphasized the emergence of avian tuberculosis in house-reared domestic birds in Egypt. The emergence of MDR- M. avium subsp. avium is considered a public health threat. Emerging MDR-M. avium subsp. avium in domestic birds are commonly harbored the IS901, inhA, rpoB, rpsL, and otrB genes. Azithromycin and clofazimine revealed a promising in-vitro antibacterial activity against M. avium subsp. avium.
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Affiliation(s)
- Abdelazeem M Algammal
- Department of Bacteriology, Immunology and Mycology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, 41522, Egypt.
| | - Hany R Hashem
- Department of Microbiology and Immunology, Faculty of Pharmacy, Fayoum University, Fayoum, 63514, Egypt
| | - Amenah S Al-Otaibi
- Biology Department, College of Sciences, Tabuk University, Tabuk, 71491, Saudi Arabia
| | - Khyreyah J Alfifi
- Biology Department, College of Sciences, Tabuk University, Tabuk, 71491, Saudi Arabia
| | | | - Eman Mahrous
- Animal Health Research Institute, Dokki, Giza, 12618, Egypt
| | - Helal F Hetta
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Assuit University, Assuit, 71515, Egypt
| | - Ali W El-Kholy
- Department of Bacteriology, Immunology and Mycology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, 41522, Egypt
| | - Hazem Ramadan
- Hygiene and Zoonoses Department, Faculty of Veterinary Medicine, Mansoura University, Mansoura, 35516, Egypt
| | - Reham M El-Tarabili
- Department of Bacteriology, Immunology and Mycology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, 41522, Egypt
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20
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Nontuberculous Mycobacteria, Macrophages, and Host Innate Immune Response. Infect Immun 2021; 89:e0081220. [PMID: 34097459 DOI: 10.1128/iai.00812-20] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Although nontuberculous mycobacteria (NTM) are considered opportunistic infections, incidence and prevalence of NTM infection are increasing worldwide becoming a major public health threat. Innate immunity plays an essential role in mediating the initial host response against these intracellular bacteria. Specifically, macrophages phagocytose and eliminate NTM and act as antigen-presenting cells, which trigger downstream activation of cellular and humoral adaptive immune responses. Identification of macrophage receptors, mycobacterial ligands, phagosome maturation, autophagy/necrosis, and escape mechanisms are important components of this immunity network. The role of the macrophage in mycobacterial disease has mainly been studied in tuberculosis (TB), but limited information exists on its role in NTM. In this review, we focus on NTM immunity, the role of macrophages, and host interaction in NTM infection.
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Performance of lipid fingerprint-based MALDI-ToF for the diagnosis of mycobacterial infections. Clin Microbiol Infect 2021; 27:912.e1-912.e5. [PMID: 32861860 PMCID: PMC8186428 DOI: 10.1016/j.cmi.2020.08.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 08/21/2020] [Accepted: 08/21/2020] [Indexed: 12/14/2022]
Abstract
OBJECTIVES Bacterial diagnosis of mycobacteria is often challenging because of the variability of the sensitivity and specificity of the assay used, and it can be expensive to perform accurately. Although matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS) has become the workhorse of clinical laboratories, the current MALDI methodology (which is based on cytosolic protein profiling) for mycobacteria is still challenging due to the number of steps involved (up to seven) and potential biosafety concerns. Knowing that mycobacteria produce surface-exposed species-specific lipids, we here hypothesized that the detection of those molecules could offer a rapid, reproducible and robust method for mycobacterial identification. METHODS We evaluated the performance of an alternative methodology based on characterized species-specific lipid profiling of intact bacteria, without any sample preparation, by MALDI MS; it uses MALDI-time-of-flight (ToF) MS combined with a specific matrix (super-2,5-dihydroxybenzoic acid solubilized in an apolar solvent system) to analyse lipids of intact heat-inactivated mycobacteria. Cultured mycobacteria are heat-inactivated and loaded directly onto the MALDI target followed by addition of the matrix. Acquisition of the data is done in both positive and negative ion modes. Blinded studies were performed using 273 mycobacterial strains comprising both the Mycobacterium tuberculosis (Mtb) complex and non-tuberculous mycobacteria (NTMs) subcultured in Middlebrook 7H9 media supplemented with 10% OADC (oleic acid/dextrose/catalase) growth supplement and incubated for up to 2 weeks at 37°C. RESULTS The method we have developed is fast (<10 mins) and highly sensitive (<1000 bacteria required); 96.7% of the Mtb complex strains (204/211) were correctly assigned as MTB complex and 91.7% (22/24) NTM species were correctly assigned based only on intact bacteria species-specific lipid profiling by MALDI-ToF MS. CONCLUSIONS Intact bacterial lipid profiling provides a biosafe and unique route for rapid and accurate mycobacterial identification.
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Jackson M, Stevens CM, Zhang L, Zgurskaya HI, Niederweis M. Transporters Involved in the Biogenesis and Functionalization of the Mycobacterial Cell Envelope. Chem Rev 2021; 121:5124-5157. [PMID: 33170669 PMCID: PMC8107195 DOI: 10.1021/acs.chemrev.0c00869] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The biology of mycobacteria is dominated by a complex cell envelope of unique composition and structure and of exceptionally low permeability. This cell envelope is the basis of many of the pathogenic features of mycobacteria and the site of susceptibility and resistance to many antibiotics and host defense mechanisms. This review is focused on the transporters that assemble and functionalize this complex structure. It highlights both the progress and the limits of our understanding of how (lipo)polysaccharides, (glyco)lipids, and other bacterial secretion products are translocated across the different layers of the cell envelope to their final extra-cytoplasmic location. It further describes some of the unique strategies evolved by mycobacteria to import nutrients and other products through this highly impermeable barrier.
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Affiliation(s)
- Mary Jackson
- Mycobacteria Research Laboratories, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523-1682, USA
| | - Casey M. Stevens
- University of Oklahoma, Department of Chemistry and Biochemistry, 101 Stephenson Parkway, Norman, OK 73019, USA
| | - Lei Zhang
- Department of Microbiology, University of Alabama at Birmingham, 845 19th Street South, Birmingham, AL 35294, USA
| | - Helen I. Zgurskaya
- University of Oklahoma, Department of Chemistry and Biochemistry, 101 Stephenson Parkway, Norman, OK 73019, USA
| | - Michael Niederweis
- Department of Microbiology, University of Alabama at Birmingham, 845 19th Street South, Birmingham, AL 35294, USA
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Abstract
Mycobacteria have unique cell envelopes, surface properties, and growth dynamics, which all play a part in the ability of these important pathogens to infect, evade host immunity, disseminate, and resist antibiotic challenges. Recent atomic force microscopy (AFM) studies have brought new insights into the nanometer-scale ultrastructural, adhesive, and mechanical properties of mycobacteria. The molecular forces with which mycobacterial adhesins bind to host factors, like heparin and fibronectin, and the hydrophobic properties of the mycomembrane have been unraveled by AFM force spectroscopy studies. Real-time correlative AFM and fluorescence imaging have delineated a complex interplay between surface ultrastructure, tensile stresses within the cell envelope, and cellular processes leading to division. The unique capabilities of AFM, which include subdiffraction-limit topographic imaging and piconewton force sensitivity, have great potential to resolve important questions that remain unanswered on the molecular interactions, surface properties, and growth dynamics of this important class of pathogens.
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Shin MK, Shin SJ. Genetic Involvement of Mycobacterium avium Complex in the Regulation and Manipulation of Innate Immune Functions of Host Cells. Int J Mol Sci 2021; 22:ijms22063011. [PMID: 33809463 PMCID: PMC8000623 DOI: 10.3390/ijms22063011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/09/2021] [Accepted: 03/12/2021] [Indexed: 12/12/2022] Open
Abstract
Mycobacterium avium complex (MAC), a collection of mycobacterial species representing nontuberculous mycobacteria, are characterized as ubiquitous and opportunistic pathogens. The incidence and prevalence of infectious diseases caused by MAC have been emerging globally due to complications in the treatment of MAC-pulmonary disease (PD) in humans and the lack of understating individual differences in genetic traits and pathogenesis of MAC species or subspecies. Despite genetically close one to another, mycobacteria species belonging to the MAC cause diseases to different host range along with a distinct spectrum of disease. In addition, unlike Mycobacterium tuberculosis, the underlying mechanisms for the pathogenesis of MAC infection from environmental sources of infection to their survival strategies within host cells have not been fully elucidated. In this review, we highlight unique genetic and genotypic differences in MAC species and the virulence factors conferring the ability to MAC for the tactics evading innate immune attacks of host cells based on the recent advances in genetic analysis by exemplifying M. avium subsp. hominissuis, a major representative pathogen causing MAC-PD in humans. Further understanding of the genetic link between host and MAC may contribute to enhance host anti-MAC immunity, but also provide novel therapeutic approaches targeting the pangenesis-associated genes of MAC.
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Affiliation(s)
- Min-Kyoung Shin
- Department of Microbiology and Convergence Medical Sciences, Institute of Health Sciences, College of Medicine, Gyeongsang National University, Jinju 52727, Korea;
| | - Sung Jae Shin
- Department of Microbiology and Institute for Immunology and Immunological Diseases, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul 03722, Korea
- Correspondence: ; Tel.: +82-2-2228-1813
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Measurable genomic changes in Mycobacterium avium subsp. hominissuis after long-term adaptation in Acanthamoeba lenticulata and reduced persistence in macrophages. J Bacteriol 2021; 203:JB.00257-20. [PMID: 33431432 PMCID: PMC8095452 DOI: 10.1128/jb.00257-20] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Free-living amoebae are ubiquitous in aquatic environments and act as environmental reservoirs for nontuberculous mycobacteria. Mycobacterium avium subsp. hominissuis recovered from Acanthamoeba has been demonstrated to be more virulent in both human and murine models. Here, we investigate the persistence of M. avium subsp. hominissuis after short-term (2 weeks) and long-term (42 weeks) co-culture in Acanthamoeba lenticulata We hypothesize that A. lenticulata-adapted M. avium subsp. hominissuis demonstrate phenotypic and genomic changes facilitating intracellular persistence in naïve Acanthamoeba and human macrophages. M. avium subsp. hominissuis CFU in co-culture with A. lenticulata were recorded every 2 weeks up to 60 weeks. While A. lenticulata-associated M. avium subsp. hominissuis CFU did not significantly change across 60 weeks of co-culture, longer adaptation time in amoebae reduced colony size. Isolates recovered after 2 or 42 weeks of amoebae co-culture were referred as "early-adapted" and "late-adapted" M. avium subsp. hominissuis, respectively. Whole genome sequencing was performed on amoebae-adapted isolates with pan-genome comparisons to the original M. avium subsp. hominissuis isolate. Next, amoebae-adapted isolates were assessed for their persistence in A. lenticulata, A. castellanii, and human THP-1 macrophages. Multiplex cytokine/chemokine analyses were conducted on THP-1 culture supernatants. Compared to the original isolate, counts of late-adapted M. avium subsp. hominissuis were reduced in Acanthamoeba and contrary to expectations, lower counts were also observed in THP-1 macrophages with concomitant decrease in TNFa, IL-6, and MIP-1b suggesting that host adaptation may influence the inflammatory properties of M. avium IMPORTANCE Short-term interaction between Acanthamoeba and M. avium has been demonstrated to increase infectivity in human and murine models of infection, establishing the paradigm that amoebae "train" M. avium in the environment by selecting for phenotypes capable of enduring in human cells. We investigate this phenomenon further by determining the consequence of long-term amoebae adaptation on M. avium subsp. hominissuis persistence in host cells. We monitored genomic changes across long-term Acanthamoeba co-culture and report significant changes to the M. avium subsp. hominissuis genome in response to amoebae-adaptation and reduced colony size. Furthermore, we examined isolates co-cultured with A. lenticulata for 2 or 42 weeks and provide biological evidence that long-term co-culture in amoebae reduces M. avium persistence in human macrophages.
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Kawakita T, Mukai T, Yoshida M, Yamada H, Nakayama M, Miyamoto Y, Suzuki M, Nakata N, Takii T, Ryo A, Ohara N, Ato M. Point mutation in the stop codon of MAV_RS14660 increases the growth rate of Mycobacterium avium subspecies hominissuis. MICROBIOLOGY (READING, ENGLAND) 2021; 167:001007. [PMID: 33357282 PMCID: PMC8131024 DOI: 10.1099/mic.0.001007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 11/30/2020] [Indexed: 11/18/2022]
Abstract
Mycobacterium avium subspecies hominissuis (MAH) is a pathogen that causes various non-tuberculous mycobacterial diseases in humans and animals worldwide. Among the genus, MAH is characterized by relatively slow growth. Here, we isolated a rapidly growing variant of the MAH 104 strain. The variant strain (named N104) exhibited an enhanced growth rate and higher motility compared to the parent MAH 104 strain (P104). Whole-genome sequencing analysis of N104 revealed the loss of the stop codon of MAV_RS14660 due to a single nucleotide replacement, resulting in the substitution of the codon for tryptophan. Notably, exclusion of the stop codon ligated the open reading frames and caused the fusion of two adjacent proteins. A revertant parent strain, in which a mutation was introduced to restore the stop codon, revealed that elimination of the stop codon in MAV_RS14660 was responsible for the N104 phenotype. Furthermore, we analysed the phenotypes of the parent and mutated strains by determining the functions of the MAV_RS14660 and MAV_RS14655 coding regions flanking the stop codon. The mutant strains, expected to express a fusion protein, exhibited increased resistance to antimicrobial drugs and exogenous copper toxicity compared to that of the parent strains. These findings suggest that the fusion of the MAV_RS14660- and MAV_RS14655-encoding regions in the mutant N104 strain could be related to the modified functions of these intrinsic proteins.
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Affiliation(s)
- Tomomi Kawakita
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, Tokyo, Japan
- Department of Microbiology and Molecular Biodefense Research, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Tetsu Mukai
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Mitsunori Yoshida
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Hiroyuki Yamada
- Department of Mycobacterium Reference and Research, Research Institute of Tuberculosis, Tokyo, Japan
| | - Masaaki Nakayama
- Department of Oral Microbiology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
- Advanced Research Center for Oral and Craniofacial Sciences, Okayama University Dental School, Okayama, Japan
| | - Yuji Miyamoto
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Masato Suzuki
- Antimicrobial Resistance Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Noboru Nakata
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, Tokyo, Japan
| | - Takemasa Takii
- Department of Mycobacterium Reference and Research, Research Institute of Tuberculosis, Tokyo, Japan
| | - Akihide Ryo
- Department of Microbiology and Molecular Biodefense Research, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Naoya Ohara
- Department of Oral Microbiology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
- Advanced Research Center for Oral and Craniofacial Sciences, Okayama University Dental School, Okayama, Japan
| | - Manabu Ato
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, Tokyo, Japan
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Cutaneous Coinfection of Cytomegalovirus and Mycobacterium chelonae Accelerated by Immunosuppression. Case Rep Pathol 2021; 2021:8819560. [PMID: 33564484 PMCID: PMC7867456 DOI: 10.1155/2021/8819560] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 01/08/2021] [Accepted: 01/22/2021] [Indexed: 11/17/2022] Open
Abstract
A mildly diabetic 58-year-old male had traumatic ulceration on the left popliteal fossa, and the lesion progressed to a painful 6 cm deep ulcer. After surgical debridement and skin grafting, ulceration recurred. Pyoderma gangrenosum was clinically diagnosed after the first biopsy, indicating a noninfective ulcer. Immunosuppressive therapy (prednisolone and cyclosporine A) induced complete epithelialization in three months. Four months later, subcutaneous nonulcerated nodules appeared on the anterior area of the left lower leg. Subcutaneous induration progressed and ulceration recurred, so that immunosuppressive therapy continued for one year. Cytomegalovirus (CMV) viremia was detected, and the second biopsy demonstrated CMV inclusions of endothelial and perivascular cells in fibrosing septolobular panniculitis. Cyclosporine A was cancelled, prednisolone was tapered, and ganciclovir started. Viremia soon disappeared, but the lesion progressed to large induration with multiple ulcers measuring up to 3 cm. The third biopsy disclosed infection of Gram-positive mycobacteria, accompanying fat droplet-centered suppurative granulomas without CMV infection. Microbial culture identified Mycobacterium chelonae. Clarithromycin with thermotherapy was effective. A review of the second biopsy confirmed coinfection of CMV and Gram-positive mycobacteria. Immunostaining using a panel of anti-bacterial antibodies visualized the mycobacteria in the lesion. Positive findings were obtained with antibodies to Bacillus Calmette-Guérin, Bacillus cereus, MPT64 (Mycobacterium tuberculosis-specific 24 kDa secretory antigen), LAM (Mycobacterium tuberculosis-related lipoarabinomannan), and PAB (Propionibacterium acnes-specific lipoteichoic acid).
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Kirubakar G, Schäfer H, Rickerts V, Schwarz C, Lewin A. Mutation on lysX from Mycobacterium avium hominissuis impacts the host-pathogen interaction and virulence phenotype. Virulence 2020; 11:132-144. [PMID: 31996090 PMCID: PMC6999840 DOI: 10.1080/21505594.2020.1713690] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 10/18/2019] [Accepted: 11/26/2019] [Indexed: 01/02/2023] Open
Abstract
The lysX gene from Mycobacterium avium hominissuis (MAH) is not only involved in cationic antimicrobial resistance but also regulates metabolic activity. An MAH lysX deficient mutant was shown to exhibit a metabolic shift at the extracellular state preadapting the bacteria to the conditions inside host-cells. It further showed stronger growth in human monocytes. In the present study, the LysX activity on host-pathogen interactions were analyzed. The lysX mutant from MAH proved to be more sensitive toward host-mediated stresses such as reactive oxygen species. Further, the lysX mutant exhibited increased inflammatory response in PBMC and multinucleated giant cell (MGC) formation in human macrophages during infection studies. Coincidentally, the lysX mutant strain revealed to be more reproductive in the Galleria mellonella infection model. Together, these data demonstrate that LysX plays a role in regulating the bacillary load in host organisms and the lack of lysX gene facilitates MAH adaptation to intracellular host-habitat, thereby suggesting an essential role of LysX in the modulation of host-pathogen interaction.
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Affiliation(s)
- Greana Kirubakar
- Division 16, Mycotic and Parasitic Agents and Mycobacteria, Robert Koch Institute, Berlin, Germany
| | - Hubert Schäfer
- Division 16, Mycotic and Parasitic Agents and Mycobacteria, Robert Koch Institute, Berlin, Germany
| | - Volker Rickerts
- Division 16, Mycotic and Parasitic Agents and Mycobacteria, Robert Koch Institute, Berlin, Germany
| | - Carsten Schwarz
- Pediatric Pneumology, Immunology and Intensive Care Medicine, Division of Cystic Fibrosis, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Astrid Lewin
- Division 16, Mycotic and Parasitic Agents and Mycobacteria, Robert Koch Institute, Berlin, Germany
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29
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Daher W, Leclercq LD, Viljoen A, Karam J, Dufrêne YF, Guérardel Y, Kremer L. O-Methylation of the Glycopeptidolipid Acyl Chain Defines Surface Hydrophobicity of Mycobacterium abscessus and Macrophage Invasion. ACS Infect Dis 2020; 6:2756-2770. [PMID: 32857488 DOI: 10.1021/acsinfecdis.0c00490] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Mycobacterium abscessus, an emerging pathogen responsible for severe lung infections in cystic fibrosis patients, displays either smooth (S) or rough (R) morphotypes. The S-to-R transition is associated with reduced levels of glycopeptidolipid (GPL) production and is correlated with increased pathogenicity in animal and human hosts. While the structure of GPL is well established, its biosynthetic pathway is incomplete. In addition, the biological functions of the distinct structural parts of this complex lipid remain elusive. Herein, the fmt gene encoding a putative O-methyltransferase was deleted in the M. abscessus S variant. Subsequent biochemical and structural analyses demonstrated that methoxylation of the fatty acyl chain of GPL was abrogated in the Δfmt mutant, and this defect was rescued upon complementation with a functional fmt gene. In contrast, the introduction of fmt derivatives mutated at residues essential for methyltransferase activity failed to complement GPL defects, indicating that fmt encodes an O-methyltransferase. Unexpectedly, phenotypic analyses showed that Δfmt was more hydrophilic than its parental progenitor, as demonstrated by hexadecane-aqueous buffer partitioning and atomic force microscopy experiments with hydrophobic probes. Importantly, the invasion rate of THP-1 macrophages by Δfmt was reduced by 50% when compared to the wild-type strain. Together, these results indicate that Fmt O-methylates the lipid moiety of GPL and plays a substantial role in conditioning the surface hydrophobicity of M. abscessus as well as in the early steps of the interaction between the bacilli and macrophages.
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Affiliation(s)
- Wassim Daher
- Centre National de la Recherche Scientifique UMR 9004, Institut de Recherche en Infectiologie de Montpellier (IRIM), Université de Montpellier, 1919 route de Mende, 34293 Montpellier, France
- INSERM, IRIM, 34293 Montpellier, France
| | - Louis-David Leclercq
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Albertus Viljoen
- Centre National de la Recherche Scientifique UMR 9004, Institut de Recherche en Infectiologie de Montpellier (IRIM), Université de Montpellier, 1919 route de Mende, 34293 Montpellier, France
- Louvain Institute of Biomolecular Science and Technology, Université Catholique de Louvain, Croix du Sud, 4-5, bte L7.07.07, B-1348 Louvain-la-Neuve, Belgium
| | - Jona Karam
- Centre National de la Recherche Scientifique UMR 9004, Institut de Recherche en Infectiologie de Montpellier (IRIM), Université de Montpellier, 1919 route de Mende, 34293 Montpellier, France
| | - Yves F. Dufrêne
- Louvain Institute of Biomolecular Science and Technology, Université Catholique de Louvain, Croix du Sud, 4-5, bte L7.07.07, B-1348 Louvain-la-Neuve, Belgium
| | - Yann Guérardel
- Univ. Lille, CNRS, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Laurent Kremer
- Centre National de la Recherche Scientifique UMR 9004, Institut de Recherche en Infectiologie de Montpellier (IRIM), Université de Montpellier, 1919 route de Mende, 34293 Montpellier, France
- INSERM, IRIM, 34293 Montpellier, France
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Bakli M, Karim L, Mokhtari-Soulimane N, Merzouk H, Vincent F. Biochemical characterization of a glycosyltransferase Gtf3 from Mycobacterium smegmatis: a case study of improved protein solubilization. 3 Biotech 2020; 10:436. [PMID: 32999813 DOI: 10.1007/s13205-020-02431-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 09/08/2020] [Indexed: 02/06/2023] Open
Abstract
Glycosyltransferases (GTs) are widely present in several organisms. These enzymes specifically transfer sugar moieties to a range of substrates. The processes of bacterial glycosylation of the cell wall and their relations with host-pathogen interactions have been studied extensively, yet the majority of mycobacterial GTs involved in the cell wall synthesis remain poorly characterized. Glycopeptidolipids (GPLs) are major class of glycolipids present on the cell wall of various mycobacterial species. They play an important role in drug resistance and host-pathogen interaction virulence. Gtf3 enzyme performs a key step in the biosynthesis of triglycosylated GPLs. Here, we describe a general procedure to achieve expression, purification, and crystallization of recombinant protein Gtf3 from Mycobacterium smegmatis using an E. coli expression system. We reported also a combined bioinformatics and biochemical methods to predict aggregation propensity and improve protein solubilization of recombinant Gtf3. NVoy, a carbohydrate-based polymer reagent, was added to prevent protein aggregation by binding to hydrophobic protein surfaces of Gtf3. Using intrinsic tryptophan fluorescence quenching experiments, we also demonstrated that Gtf3-NVoy enzyme interacted with TDP and UDP nucleotide ligands. This case report proposes useful tools for the study of other glycosyltransferases which are rather difficult to characterize and crystallize.
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Affiliation(s)
- Mahfoud Bakli
- Department of Science of Nature and Life, Institute of Science, University Center Belhadj Bouchaib of Ain Temouchent, Po Box 284, 46000 Ain Temouchent, Algeria
- Laboratory of Physiology, Pathophysiology and Biochemistry of Nutrition, University Abou-Bekr Belkaid of Tlemcen, Tlemcen, Algeria
- Architecture et Fonction des Macromolécules Biologiques, CNRS, Aix-Marseille University, Marseille, France
| | - Loukmane Karim
- University of Strasbourg, CNRS, Architecture and Reactivity of RNA, UPR9002 Strasbourg, France
| | - Nassima Mokhtari-Soulimane
- Laboratory of Physiology, Pathophysiology and Biochemistry of Nutrition, University Abou-Bekr Belkaid of Tlemcen, Tlemcen, Algeria
| | - Hafida Merzouk
- Laboratory of Physiology, Pathophysiology and Biochemistry of Nutrition, University Abou-Bekr Belkaid of Tlemcen, Tlemcen, Algeria
| | - Florence Vincent
- Architecture et Fonction des Macromolécules Biologiques, CNRS, Aix-Marseille University, Marseille, France
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Nishimura T, Shimoda M, Tamizu E, Uno S, Uwamino Y, Kashimura S, Yano I, Hasegawa N. The rough colony morphotype of Mycobacterium avium exhibits high virulence in human macrophages and mice. J Med Microbiol 2020; 69:1020-1033. [PMID: 32589124 DOI: 10.1099/jmm.0.001224] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Introduction. The incidence of Mycobacterium avium complex (MAC) pulmonary disease (MAC PD), a refractory chronic respiratory tract infection, is increasing worldwide. MAC has three predominant colony morphotypes: smooth opaque (SmO), smooth transparent (SmT) and rough (Rg).Aim. To determine whether colony morphotypes can predict the prognosis of MAC PD, we evaluated the virulence of SmO, SmT and Rg in mice and in human macrophages.Methodology. We compared the characteristics of mice and human macrophages infected with the SmO, SmT, or Rg morphotypes of M. avium subsp. hominissuis 104. C57BL/6 mice and human macrophages derived from peripheral mononuclear cells were used in these experiments.Results. In comparison to SmO- or SmT-infected mice, Rg-infected mice revealed severe pathologically confirmed pneumonia, increased lung weight and increased lung bacterial burden. Rg-infected macrophages revealed significant cytotoxicity, increased bacterial burden, secretion of proinflammatory cytokines (TNF-α and IL-6) and chemokines (CCL5 and CCL3), and formation of cell clusters. Rg formed larger bacterial aggregates than SmO and SmT. Cytotoxicity, bacterial burden and secretion of IL-6, CCL5 and CCL3 were induced strongly by Rg infection, and were decreased by disaggregation of the bacteria.Conclusion. M. avium Rg, which is associated with bacterial aggregation, has the highest virulence among the predominant colony morphotypes.
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Affiliation(s)
| | - Masayuki Shimoda
- Department of Pathology, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
| | - Eiko Tamizu
- Department of Infectious Diseases, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
| | - Shunsuke Uno
- Department of Infectious Diseases, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
| | - Yoshifumi Uwamino
- Department of Laboratory Medicine, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
| | - Shoko Kashimura
- Department of Infectious Diseases, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
| | - Ikuya Yano
- Department of Bacteriology, Osaka City University Graduate School of Medicine, Osaka-city, Osaka, Japan
| | - Naoki Hasegawa
- Department of Infectious Diseases, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan
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To K, Cao R, Yegiazaryan A, Owens J, Venketaraman V. General Overview of Nontuberculous Mycobacteria Opportunistic Pathogens: Mycobacterium avium and Mycobacterium abscessus. J Clin Med 2020; 9:jcm9082541. [PMID: 32781595 PMCID: PMC7463534 DOI: 10.3390/jcm9082541] [Citation(s) in RCA: 109] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 08/02/2020] [Accepted: 08/04/2020] [Indexed: 12/20/2022] Open
Abstract
Nontuberculous mycobacteria (NTM) are emerging human pathogens, causing a wide range of clinical diseases affecting individuals who are immunocompromised and who have underlying health conditions. NTM are ubiquitous in the environment, with certain species causing opportunistic infection in humans, including Mycobacterium avium and Mycobacterium abscessus. The incidence and prevalence of NTM infections are rising globally, especially in developed countries with declining incidence rates of M. tuberculosis infection. Mycobacterium avium, a slow-growing mycobacterium, is associated with Mycobacterium avium complex (MAC) infections that can cause chronic pulmonary disease, disseminated disease, as well as lymphadenitis. M. abscessus infections are considered one of the most antibiotic-resistant mycobacteria and are associated with pulmonary disease, especially cystic fibrosis, as well as contaminated traumatic skin wounds, postsurgical soft tissue infections, and healthcare-associated infections (HAI). Clinical manifestations of diseases depend on the interaction of the host’s immune response and the specific mycobacterial species. This review will give a general overview of the general characteristics, vulnerable populations most at risk, pathogenesis, treatment, and prevention for infections caused by Mycobacterium avium, in the context of MAC, and M. abscessus.
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Affiliation(s)
- Kimberly To
- Graduate College of Biomedical Sciences, Western University of Health Sciences, Pomona, CA 91766-1854, USA; (K.T.); (A.Y.)
| | - Ruoqiong Cao
- Department of Basic Medical Sciences, College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA 91766-1854, USA; (R.C.); (J.O.)
| | - Aram Yegiazaryan
- Graduate College of Biomedical Sciences, Western University of Health Sciences, Pomona, CA 91766-1854, USA; (K.T.); (A.Y.)
| | - James Owens
- Department of Basic Medical Sciences, College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA 91766-1854, USA; (R.C.); (J.O.)
| | - Vishwanath Venketaraman
- Department of Basic Medical Sciences, College of Osteopathic Medicine of the Pacific, Western University of Health Sciences, Pomona, CA 91766-1854, USA; (R.C.); (J.O.)
- Correspondence: ; Tel.: +1-909-706-3736
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16S and 23S rRNA Gene Mutation Independent Multidrug Resistance of Non-Tuberculous Mycobacteria Isolated from South Korean Soil. Microorganisms 2020; 8:microorganisms8081114. [PMID: 32722306 PMCID: PMC7465728 DOI: 10.3390/microorganisms8081114] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 07/21/2020] [Accepted: 07/22/2020] [Indexed: 12/02/2022] Open
Abstract
Non-tuberculous mycobacteria (NTM) are ubiquitous microorganisms that have the potential to cause disease in both humans and animals. Recently, NTM infections have rapidly increased in South Korea, especially in urbanized areas. However, the distribution of species and the antibiotic resistance profile of NTM in environmental sources have not yet been investigated. Therefore, we analyzed the distribution of species and the antibiotic resistance profile of NTM in soil within urban areas of South Korea. A total of 132 isolates of NTM were isolated from soil samples from 1 municipal animal shelter and 4 urban area parks. Among the 132 isolates, 105 isolates were identified as slowly growing mycobacteria (SGM) and 27 isolates as rapidly growing mycobacteria (RGM) based on the sequences of the rpoB and hsp65 genes. The antibiotic resistance patterns of NTM isolates differed from species to species. Additionally, a mutation in the rrs gene found in this study was not associated with aminoglycoside resistance. In conclusion, our results showed that NTM isolates from South Korean soil exhibit multidrug resistance to streptomycin, amikacin, azithromycin, ethambutol, isoniazid, and imipenem. These results suggest that NTM may pose a public threat.
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Host Immune Response and Novel Diagnostic Approach to NTM Infections. Int J Mol Sci 2020; 21:ijms21124351. [PMID: 32570978 PMCID: PMC7352966 DOI: 10.3390/ijms21124351] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/15/2020] [Accepted: 06/16/2020] [Indexed: 02/07/2023] Open
Abstract
The incidence and prevalence of non-tuberculous mycobacteria (NTM) infections are steadily increasing worldwide, partially due to the increased incidence of immunocompromised conditions, such as the post-transplantation state. The importance of proper diagnosis and management of NTM infection has been recently recognized. Host immunological responses play integral roles in vulnerability to NTM infections, and may contribute to the onset of specific types of NTM infection. Furthermore, distinct NTM species are known to affect and attenuate these host immune responses in unique manners. Therefore, host immune responses must be understood with respect to each causative NTM species. Here, we review innate, cellular-mediated, and humoral immunity to NTM and provide perspectives on novel diagnostic approaches regarding each NTM species.
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Johansen MD, Herrmann JL, Kremer L. Non-tuberculous mycobacteria and the rise of Mycobacterium abscessus. Nat Rev Microbiol 2020; 18:392-407. [PMID: 32086501 DOI: 10.1038/s41579-020-0331-1] [Citation(s) in RCA: 364] [Impact Index Per Article: 91.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/15/2020] [Indexed: 12/17/2022]
Abstract
Infections caused by non-tuberculous mycobacteria (NTM) are increasing globally and are notoriously difficult to treat due to intrinsic resistance of these bacteria to many common antibiotics. NTM are diverse and ubiquitous in the environment, with only a few species causing serious and often opportunistic infections in humans, including Mycobacterium abscessus. This rapidly growing mycobacterium is one of the most commonly identified NTM species responsible for severe respiratory, skin and mucosal infections in humans. It is often regarded as one of the most antibiotic-resistant mycobacteria, leaving us with few therapeutic options. In this Review, we cover the proposed infection process of M. abscessus, its virulence factors and host interactions and highlight the commonalities and differences of M. abscessus with other NTM species. Finally, we discuss drug resistance mechanisms and future therapeutic options. Taken together, this knowledge is essential to further our understanding of this overlooked and neglected global threat.
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Affiliation(s)
- Matt D Johansen
- Institut de Recherche en Infectiologie de Montpellier, Centre National de la Recherche Scientifique UMR 9004, Université de Montpellier, Montpellier, France
| | - Jean-Louis Herrmann
- Université Paris-Saclay, UVSQ, Inserm, Infection et Inflammation, Montigny-Le-Bretonneux, France.,AP-HP. GHU Paris Saclay, Hôpital Raymond Poincaré, Garches, France
| | - Laurent Kremer
- Institut de Recherche en Infectiologie de Montpellier, Centre National de la Recherche Scientifique UMR 9004, Université de Montpellier, Montpellier, France. .,Inserm, Institut de Recherche en Infectiologie de Montpellier, Montpellier, France.
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Degiacomi G, Sammartino JC, Chiarelli LR, Riabova O, Makarov V, Pasca MR. Mycobacterium abscessus, an Emerging and Worrisome Pathogen among Cystic Fibrosis Patients. Int J Mol Sci 2019; 20:ijms20235868. [PMID: 31766758 PMCID: PMC6928860 DOI: 10.3390/ijms20235868] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/20/2019] [Accepted: 11/20/2019] [Indexed: 01/09/2023] Open
Abstract
Nontuberculous mycobacteria (NTM) have recently emerged as important pathogens among cystic fibrosis (CF) patients worldwide. Mycobacterium abscessus is becoming the most worrisome NTM in this cohort of patients and recent findings clarified why this pathogen is so prone to this disease. M. abscessus drug therapy takes up to 2 years and its failure causes an accelerated lung function decline. The M. abscessus colonization of lung alveoli begins with smooth strains producing glycopeptidolipids and biofilm, whilst in the invasive infection, "rough" mutants are responsible for the production of trehalose dimycolate, and consequently, cording formation. Human-to-human M. abscessus transmission was demonstrated among geographically separated CF patients by whole-genome sequencing of clinical isolates worldwide. Using a M. abscessus infected CF zebrafish model, it was demonstrated that CFTR (cystic fibrosis transmembrane conductance regulator) dysfunction seems to have a specific role in the immune control of M. abscessus infections only. This pathogen is also intrinsically resistant to many drugs, thanks to its physiology and to the acquisition of new mechanisms of drug resistance. Few new compounds or drug formulations active against M. abscessus are present in preclinical and clinical development, but recently alternative strategies have been investigated, such as phage therapy and the use of β-lactamase inhibitors.
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Affiliation(s)
- Giulia Degiacomi
- Department of Biology and Biotechnology “Lazzaro Spallanzani”, University of Pavia, 27100 Pavia, Italy; (G.D.); (J.C.S.); (L.R.C.)
| | - José Camilla Sammartino
- Department of Biology and Biotechnology “Lazzaro Spallanzani”, University of Pavia, 27100 Pavia, Italy; (G.D.); (J.C.S.); (L.R.C.)
- IUSS—University School for Advanced Studies, 27100 Pavia, Italy
| | - Laurent Roberto Chiarelli
- Department of Biology and Biotechnology “Lazzaro Spallanzani”, University of Pavia, 27100 Pavia, Italy; (G.D.); (J.C.S.); (L.R.C.)
| | - Olga Riabova
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia; (O.R.); (V.M.)
| | - Vadim Makarov
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia; (O.R.); (V.M.)
| | - Maria Rosalia Pasca
- Department of Biology and Biotechnology “Lazzaro Spallanzani”, University of Pavia, 27100 Pavia, Italy; (G.D.); (J.C.S.); (L.R.C.)
- Correspondence: ; Tel.: +39-0382-985576
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Insights into the Physiology and Metabolism of a Mycobacterial Cell in an Energy-Compromised State. J Bacteriol 2019; 201:JB.00210-19. [PMID: 31285242 DOI: 10.1128/jb.00210-19] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 07/02/2019] [Indexed: 12/16/2022] Open
Abstract
Mycobacterium tuberculosis, a bacterium that causes tuberculosis, poses a serious threat, especially due to the emergence of drug-resistant strains. M. tuberculosis and other mycobacterial species, such as M. smegmatis, are known to generate an inadequate amount of energy by substrate-level phosphorylation and mandatorily require oxidative phosphorylation (OXPHOS) for their growth and metabolism. Hence, antibacterial drugs, such as bedaquiline, targeting the multisubunit ATP synthase complex, which is required for OXPHOS, have been developed with the aim of eliminating pathogenic mycobacteria. Here, we explored the influence of suboptimal OXPHOS on the physiology and metabolism of M. smegmatis M. smegmatis harbors two identical copies of atpD, which codes for the β subunit of ATP synthase. We show that upon deletion of one copy of atpD (M. smegmatis ΔatpD), M. smegmatis synthesizes smaller amounts of ATP and enters into an energy-compromised state. The mutant displays remarkable phenotypic and physiological differences from the wild type, such as respiratory slowdown, reduced biofilm formation, lesser amounts of cell envelope polar lipids, and increased antibiotic sensitivity compared to the wild type. Additionally, M. smegmatis ΔatpD overexpresses genes belonging to the dormancy operon, the β-oxidation pathway, and the glyoxylate shunt, suggesting that the mutant adapts to a low energy state by switching to alternative pathways to produce energy. Interestingly, M. smegmatis ΔatpD shows significant phenotypic, metabolic, and physiological similarities with bedaquiline-treated wild-type M. smegmatis We believe that the identification and characterization of key metabolic pathways functioning during an energy-compromised state will enhance our understanding of bacterial adaptation and survival and will open newer avenues in the form of drug targets that may be used in the treatment of mycobacterial infections.IMPORTANCE M. smegmatis generates an inadequate amount of energy by substrate-level phosphorylation and mandatorily requires oxidative phosphorylation (OXPHOS) for its growth and metabolism. Here, we explored the influence of suboptimal OXPHOS on M. smegmatis physiology and metabolism. M. smegmatis harbors two identical copies of the atpD gene, which codes for the ATP synthase β subunit. Here, we carried out the deletion of only one copy of atpD in M. smegmatis to understand the bacterial survival response in an energy-deprived state. M. smegmatis ΔatpD shows remarkable phenotypic, metabolic, and physiological differences from the wild type. Our study thus establishes M. smegmatis ΔatpD as an energy-compromised mycobacterial strain, highlights the importance of ATP synthase in mycobacterial physiology, and further paves the way for the identification of novel antimycobacterial drug targets.
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Kitada S. Application of a commercial serodiagnostic kit that measures the serum anti-glycopeptidolipid core IgA antibody in Mycobacterium avium complex pulmonary disease. Respir Investig 2019; 57:410-414. [PMID: 31085120 DOI: 10.1016/j.resinv.2019.04.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 03/28/2019] [Accepted: 04/09/2019] [Indexed: 06/09/2023]
Abstract
The diagnosis of Mycobacterium avium complex (MAC) pulmonary disease is occasionally cumbersome and time-consuming because the MAC species is ubiquitous, and therefore its detection is not necessarily indicative of a definitive diagnosis. A serodiagnostic method specific for MAC pulmonary disease that measures the serum anti-glycopeptidolipid core antigen IgA has been developed and is commercially available. Meta-analysis revealed that the test showed a good diagnostic accuracy. The estimated sensitivity and specificity values were 69.6% (95% confidence interval 62.1-76.1) and 90.6% (95% confidence interval 83.6-95.1), respectively. As antibody levels may reflect the disease activity, their serial measurement can also be used in the management of MAC disease. To justify its routine use in clinical practice, further validation in various regions and studies addressing whether serodiagnosis combined with present diagnostic criteria facilitate more rapid accurate diagnosis of MAC pulmonary disease are necessary.
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Affiliation(s)
- Seigo Kitada
- Department of Respiratory Medicine, Yao Tokushukai General Hospital, 1-17 Wakakusa-cho Yao-city, Osaka, 581-0011, Japan.
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Tran T, Bonham AJ, Chan ED, Honda JR. A paucity of knowledge regarding nontuberculous mycobacterial lipids compared to the tubercle bacillus. Tuberculosis (Edinb) 2019; 115:96-107. [PMID: 30948183 DOI: 10.1016/j.tube.2019.02.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 01/29/2019] [Accepted: 02/25/2019] [Indexed: 10/27/2022]
Abstract
All mycobacteria, including nontuberculous mycobacteria (NTM), synthesize an array of lipids including phosphatidylinositol mannosides (PIM), lipomannan (LM), and lipoarabinomannan (LAM). While absent from Mycobacterium tuberculosis (M. tb), glycopeptidolipids (GPL) are critical to the biology of NTM. M. tb and some NTM also synthesize trehalose-containing glycolipids and phenolic glycolipids (PGL), key membrane constituents with essential roles in metabolism. While lipids facilitate immune evasion, they also induce host immunity against tuberculosis. However, much less is known about the significance of NTM-derived PIM, LM, LAM, GPL, trehalose-containing glycolipids, and PGL as virulence factors, warranting further investigation. While culling the scientific literature on NTM lipids, it's evident that such studies were relatively few in number with the overwhelming majority of prior work dedicated to understanding lipids from the saprophyte Mycobacterium smegmatis. The identification and functional analysis of immune reactive NTM-derived lipids remain challenging, but such work is likely to yield a greater understanding of the pathogenesis of NTM lung disease. In this review, we juxtapose the vast literature of what is currently known regarding M. tb lipids to the lesser number of studies for comparable NTM lipids. But because GPL is the most widely recognized NTM lipid, we highlight its role in disease pathogenesis.
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Affiliation(s)
- Tru Tran
- Department of Integrative Biology, University of Colorado Denver, Campus Box 171, PO Box 173364, Denver, CO, 80217-3364, USA.
| | - Andrew J Bonham
- Department of Chemistry, Metropolitan State University of Denver, Campus Box 52, P.O. Box 173362, Denver, CO, 80217-3362, USA.
| | - Edward D Chan
- Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, USA; Department of Medicine, Denver Veterans Affairs Medical Center, Denver, CO, USA; Academic Affairs, National Jewish Health, 1400 Jackson St. Neustadt D509, Denver, CO, 80206, USA.
| | - Jennifer R Honda
- Department of Biomedical Research and the Center for Genes, Environment, and Health, National Jewish Health, Denver, CO, USA.
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Kumar A, Alam A, Grover S, Pandey S, Tripathi D, Kumari M, Rani M, Singh A, Akhter Y, Ehtesham NZ, Hasnain SE. Peptidyl-prolyl isomerase-B is involved in Mycobacterium tuberculosis biofilm formation and a generic target for drug repurposing-based intervention. NPJ Biofilms Microbiomes 2019; 5:3. [PMID: 30675370 PMCID: PMC6333787 DOI: 10.1038/s41522-018-0075-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 10/15/2018] [Indexed: 01/03/2023] Open
Abstract
Tuberculosis (TB), a disease caused by Mycobacterium tuberculosis (M.tb), takes one human life every 15 s globally. Disease relapse occurs due to incomplete clearance of the pathogen and reactivation of the antibiotic tolerant bacilli. M.tb, like other bacterial pathogens, creates an ecosystem of biofilm formed by several proteins including the cyclophilins. We show that the M.tb cyclophilin peptidyl-prolyl isomerase (PpiB), an essential gene, is involved in biofilm formation and tolerance to anti-mycobacterial drugs. We predicted interaction between PpiB and US FDA approved drugs (cyclosporine-A and acarbose) by in-silico docking studies and this was confirmed by surface plasmon resonance (SPR) spectroscopy. While all these drugs inhibited growth of Mycobacterium smegmatis (M.smegmatis) when cultured in vitro, acarbose and cyclosporine-A showed bacteriostatic effect while gallium nanoparticle (GaNP) exhibited bactericidal effect. Cyclosporine-A and GaNP additionally disrupted M.tb H37Rv biofilm formation. Co-culturing M.tb in their presence resulted in significant (2–4 fold) decrease in dosage of anti-tubercular drugs- isoniazid and ethambutol. Comparison of the cyclosporine-A and acarbose binding sites in PpiB homologues of other biofilm forming infectious pathogens revealed that these have largely remained unaltered across bacterial species. Targeting bacterial biofilms could be a generic strategy for intervention against bacterial pathogens. Tuberculosis, caused by Mycobacterium tuberculosis, is the leading cause of death due to a single infectious agent. New therapeutic options are needed, and repurposing clinically approved drugs to destroy biofilms is an attractive approach, as these microbial communities are often less susceptible to antibiotics. A team lead by Seyed Hasnain at the Indian Institute of Technology Delhi identified an enzyme, PpiB, from M. tuberculosis that promoted biofilm formation and showed that PpiB interacts with several drugs that are currently used to treat diabetes, immunological diseases and cancer. These drugs destabilise M. tuberculosis biofilms in culture and enhanced the potency of two current anti-tuberculosis antibiotics. Future work is needed to test these medications against tuberculosis in humans, but given PpiB is found in different bacteria, there may be broader promise of using these repurposed drugs to combat other infections.
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Affiliation(s)
- Ashutosh Kumar
- 1JH-Institute of Molecular Medicine, Jamia Hamdard, New Delhi, India.,Present Address: Department of Microbiology, Tripura Central University, Suryamaninagar, Agartala, Tripura India
| | - Anwar Alam
- 1JH-Institute of Molecular Medicine, Jamia Hamdard, New Delhi, India.,2Molecular Infection and Functional Biology Lab, Kusuma School of Biological Sciences, Indian Institute of Technology-Delhi, New Delhi, India
| | - Sonam Grover
- 1JH-Institute of Molecular Medicine, Jamia Hamdard, New Delhi, India
| | - Saurabh Pandey
- 3National Institute of Pathology, Safdarjung Hospital Campus, New Delhi, India.,11Present Address: Department of Biochemistry, Jamia Hamdard, New Delhi, India
| | - Deeksha Tripathi
- 2Molecular Infection and Functional Biology Lab, Kusuma School of Biological Sciences, Indian Institute of Technology-Delhi, New Delhi, India.,4Department of Microbiology, Central University of Rajasthan, Ajmer, Rajasthan India
| | - Monika Kumari
- 5Centre for Computational Biology and Bioinformatics, School of Life Sciences, Central University of Himachal Pradesh, Himachal Pradesh, India
| | - Mamta Rani
- 6Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology-Delhi, New Delhi, India
| | - Aditi Singh
- 7School of Biotechnology, Jawaharlal Nehru University, New Delhi, India
| | - Yusuf Akhter
- 8Department of Biotechnology, Babasaheb Bhimrao Ambedkar University, Lucknow, India
| | - Nasreen Z Ehtesham
- 3National Institute of Pathology, Safdarjung Hospital Campus, New Delhi, India
| | - Seyed E Hasnain
- 1JH-Institute of Molecular Medicine, Jamia Hamdard, New Delhi, India.,2Molecular Infection and Functional Biology Lab, Kusuma School of Biological Sciences, Indian Institute of Technology-Delhi, New Delhi, India.,9Dr Reddy's Institute of Life Sciences, University of Hyderabad Campus, Prof CR Rao Road, Hyderabad, India
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Mycobacterium avium: an overview. Tuberculosis (Edinb) 2019; 114:127-134. [PMID: 30711152 DOI: 10.1016/j.tube.2018.12.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Revised: 12/20/2018] [Accepted: 12/28/2018] [Indexed: 01/15/2023]
Abstract
Mycobacterium avium is an environmental microorganism found in soil and water sources worldwide. It is the most prevalent species of nontuberculous mycobacteria that causes infectious diseases, especially in immunocompromised individuals. This review discusses and highlights key topics about M. avium, such as epidemiology, pathogenicity, glycopeptidolipids, laboratory identification, genotyping, antimicrobial therapy and antimicrobial resistance. Additionally, the main comorbidities associated with M. avium infection are discussed.
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Abstract
Actinobacteria is a group of diverse bacteria. Most species in this class of bacteria are filamentous aerobes found in soil, including the genus Streptomyces perhaps best known for their fascinating capabilities of producing antibiotics. These bacteria typically have a Gram-positive cell envelope, comprised of a plasma membrane and a thick peptidoglycan layer. However, there is a notable exception of the Corynebacteriales order, which has evolved a unique type of outer membrane likely as a consequence of convergent evolution. In this chapter, we will focus on the unique cell envelope of this order. This cell envelope features the peptidoglycan layer that is covalently modified by an additional layer of arabinogalactan . Furthermore, the arabinogalactan layer provides the platform for the covalent attachment of mycolic acids , some of the longest natural fatty acids that can contain ~100 carbon atoms per molecule. Mycolic acids are thought to be the main component of the outer membrane, which is composed of many additional lipids including trehalose dimycolate, also known as the cord factor. Importantly, a subset of bacteria in the Corynebacteriales order are pathogens of human and domestic animals, including Mycobacterium tuberculosis. The surface coat of these pathogens are the first point of contact with the host immune system, and we now know a number of host receptors specific to molecular patterns exposed on the pathogen's surface, highlighting the importance of understanding how the cell envelope of Actinobacteria is structured and constructed. This chapter describes the main structural and biosynthetic features of major components found in the actinobacterial cell envelopes and highlights the key differences between them.
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Affiliation(s)
- Kathryn C Rahlwes
- Department of Microbiology, University of Massachusetts, 639 North Pleasant Street, Amherst, MA, 01003, USA
| | - Ian L Sparks
- Department of Microbiology, University of Massachusetts, 639 North Pleasant Street, Amherst, MA, 01003, USA
| | - Yasu S Morita
- Department of Microbiology, University of Massachusetts, 639 North Pleasant Street, Amherst, MA, 01003, USA.
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Two dd-Carboxypeptidases from Mycobacterium smegmatis Affect Cell Surface Properties through Regulation of Peptidoglycan Cross-Linking and Glycopeptidolipids. J Bacteriol 2018; 200:JB.00760-17. [PMID: 29735762 DOI: 10.1128/jb.00760-17] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Accepted: 04/25/2018] [Indexed: 11/20/2022] Open
Abstract
During the peptidoglycan (PG) maturation of mycobacteria, the glycan strands are interlinked by both 3-3 (between two meso-diaminopimelic acids [meso-DAPs]) and 4-3 cross-links (between d-Ala and meso-DAP), though there is a predominance (60 to 80%) of 3-3 cross-links. The dd-carboxypeptidases (dd-CPases) act on pentapeptides to generate tetrapeptides that are used by ld-transpeptidases as substrates to form 3-3 cross-links. Therefore, dd-CPases play a crucial role in mycobacterial PG cross-link formation. However, the physiology of dd-CPases in mycobacteria is relatively unexplored. In this study, we deleted two dd-CPase genes, msmeg_2433 and msmeg_2432, both individually and in combination, from Mycobacterium smegmatis mc2155. Though the single dd-CPase gene deletions had no significant impact on the mycobacterial physiology, many interesting functional alterations were observed in the double-deletion mutant, viz, a predominance in PG cross-link formation was shifted from 3-3 cross-links to 4-3, cell surface glycopeptidolipid (GPL) expression was reduced, and susceptibility to β-lactams and antitubercular agents was enhanced. Moreover, the survival rate of the double mutant within murine macrophages was higher than that of the parent. Interestingly, the complementation with any one of the dd-CPase genes could restore the wild-type phenotype. In a nutshell, we infer that the altered ratio of 4-3 to 3-3 PG cross-links might have influenced the expression of surface GPLs, colony morphology, biofilm formation, drug susceptibility, and subsistence of the cells within macrophages.IMPORTANCE The glycan strands in mycobacterial peptidoglycan (PG) are interlinked by both 3-3 and 4-3 cross-links. The dd-CPases generate tetrapeptides by acting on the pentapeptides, and ld-transpeptidases use tetrapeptides as substrates to form 3-3 cross-links. In this study, we showed that simultaneous deletions of two dd-CPases alter the nature of PG cross-linking from 3-3 cross-links to 4-3 cross-links. The deletions subsequently decrease the expression of glycopeptidolipids (significant surface lipid present in many nontuberculous mycobacteria, including Mycobacterium smegmatis) and affect other physiological parameters, like cell morphology, growth rate, biofilm formation, antibiotic susceptibility, and survival within murine macrophages. Thus, unraveling the physiology of dd-CPases might help us design antimycobacterial therapeutics in the future.
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Gutiérrez AV, Viljoen A, Ghigo E, Herrmann JL, Kremer L. Glycopeptidolipids, a Double-Edged Sword of the Mycobacterium abscessus Complex. Front Microbiol 2018; 9:1145. [PMID: 29922253 PMCID: PMC5996870 DOI: 10.3389/fmicb.2018.01145] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 05/14/2018] [Indexed: 01/14/2023] Open
Abstract
Mycobacterium abscessus is a rapidly-growing species causing a diverse panel of clinical manifestations, ranging from cutaneous infections to severe respiratory disease. Its unique cell wall, contributing largely to drug resistance and to pathogenicity, comprises a vast panoply of complex lipids, among which the glycopeptidolipids (GPLs) have been the focus of intense research. These lipids fulfill various important functions, from sliding motility or biofilm formation to interaction with host cells and intramacrophage trafficking. Being highly immunogenic, the induction of a strong humoral response is likely to select for rough low-GPL producers. These, in contrast to the smooth high-GPL producers, display aggregative properties, which strongly impacts upon intracellular survival. A propensity to grow as extracellular cords allows these low-GPL producing bacilli to escape the innate immune defenses. Transitioning from high-GPL to low-GPL producers implicates mutations within genes involved in biosynthesis or transport of GPL. This leads to induction of an intense pro-inflammatory response and robust and lethal infections in animal models, explaining the presence of rough isolates in patients with decreased pulmonary functions. Herein, we will discuss how, thanks to the generation of defined GPL mutants and the development of appropriate cellular and animal models to study pathogenesis, GPL contribute to M. abscessus biology and physiopathology.
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Affiliation(s)
- Ana Victoria Gutiérrez
- Centre National de la Recherche Scientifique, Institut de Recherche en Infectiologie de Montpellier, UMR 9004, Université de Montpellier, Montpellier, France.,CNRS, IRD 198, INSERM U1095, APHM, Institut Hospitalo-Universitaire Méditerranée Infection, UMR 7278, Aix-Marseille Université, Marseille, France
| | - Albertus Viljoen
- Centre National de la Recherche Scientifique, Institut de Recherche en Infectiologie de Montpellier, UMR 9004, Université de Montpellier, Montpellier, France
| | - Eric Ghigo
- CNRS, Campus Joseph Aiguier, Marseille, France
| | | | - Laurent Kremer
- Centre National de la Recherche Scientifique, Institut de Recherche en Infectiologie de Montpellier, UMR 9004, Université de Montpellier, Montpellier, France.,INSERM, IRIM, Montpellier, France
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45
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Lai LY, Lin TL, Chen YY, Hsieh PF, Wang JT. Role of the Mycobacterium marinum ESX-1 Secretion System in Sliding Motility and Biofilm Formation. Front Microbiol 2018; 9:1160. [PMID: 29899738 PMCID: PMC5988883 DOI: 10.3389/fmicb.2018.01160] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 05/14/2018] [Indexed: 11/13/2022] Open
Abstract
Mycobacterium marinum is a close relative of Mycobacterium tuberculosis that can cause systemic tuberculosis-like infections in ectotherms and skin infections in humans. Sliding motility correlates with biofilm formation and virulence in most bacteria. In this study, we used a sliding motility assay to screen 2,304 transposon mutants of M. marinum NTUH-M6885 and identified five transposon mutants with decreased sliding motility. Transposons that interrupted the type VII secretion system (T7SS) ESX-1-related genes, espE (mmar_5439), espF (mmar_5440), and eccA1 (mmar_5443), were present in 3 mutants. We performed reverse-transcription polymerase chain reaction to verify genes from mmar_5438 to mmar_5450, which were found to belong to a single transcriptional unit. Deletion mutants of espE, espF, espG (mmar_5441), and espH (mmar_5442) displayed significant attenuation regarding sliding motility and biofilm formation. M. marinum NTUH-M6885 possesses a functional ESX-1 secretion system. However, deletion of espG or espH resulted in slightly decreased secretion of EsxB (which is also known as CFP-10). Thus, the M. marinum ESX-1 secretion system mediates sliding motility and is crucial for biofilm formation. These data provide new insight into M. marinum biofilm formation.
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Affiliation(s)
- Li-Yin Lai
- Department of Microbiology, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Tzu-Lung Lin
- Department of Microbiology, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Yi-Yin Chen
- Department of Pediatrics, Chang Gung Children's Hospital, Chang Gung Memorial Hospital, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Pei-Fang Hsieh
- Department of Microbiology, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Jin-Town Wang
- Department of Microbiology, National Taiwan University College of Medicine, Taipei, Taiwan.,Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
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Effect of Homocysteine on Biofilm Formation by Mycobacteria. Indian J Microbiol 2018; 58:287-293. [PMID: 30013272 DOI: 10.1007/s12088-018-0739-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 05/03/2018] [Indexed: 12/29/2022] Open
Abstract
Mycobacteria show peculiar aggregated outgrowth like biofilm on the surface of solid or liquid media. Biofilms harbor antibiotic resistant bacteria in a self-produced extracellular matrix that signifies the bacterial fate to sedentary existence. Despite years of research, very little is known about the mechanisms that contribute to biofilm formation. LuxS has been previously known to play a role in biofilm formation in Autoinducer-2 dependent manner. We here show the effect of LuxS product-homocysteine, on the biofilm forming ability of non-tuberculous mycobacteria, Mycobacterium smegmatis and Mycobacterium bovis BCG showing AI-2 independent phenotypic effect of LuxS. Exogenous supplementation of homocysteine in the culture media leads to aberrant cording, pellicle outgrowth, and biofilm formation. Thus, our study contributes to the better understanding of the mechanism of mycobacterial biofilm formation and sheds light on the role of LuxS product homocysteine. In addition, we highlight the contribution of activated methyl cycle in bacterial quorum sensing.
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Lefebvre C, Boulon R, Ducoux M, Gavalda S, Laval F, Jamet S, Eynard N, Lemassu A, Cam K, Bousquet MP, Bardou F, Burlet-Schiltz O, Daffé M, Quémard A. HadD, a novel fatty acid synthase type II protein, is essential for alpha- and epoxy-mycolic acid biosynthesis and mycobacterial fitness. Sci Rep 2018; 8:6034. [PMID: 29662082 PMCID: PMC5902629 DOI: 10.1038/s41598-018-24380-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 04/03/2018] [Indexed: 02/05/2023] Open
Abstract
Mycolic acids (MAs) have a strategic location within the mycobacterial envelope, deeply influencing its architecture and permeability, and play a determinant role in the pathogenicity of mycobacteria. The fatty acid synthase type II (FAS-II) multienzyme system is involved in their biosynthesis. A combination of pull-downs and proteomics analyses led to the discovery of a mycobacterial protein, HadD, displaying highly specific interactions with the dehydratase HadAB of FAS-II. In vitro activity assays and homology modeling showed that HadD is, like HadAB, a hot dog folded (R)-specific hydratase/dehydratase. A hadD knockout mutant of Mycobacterium smegmatis produced only the medium-size alpha’-MAs. Data strongly suggest that HadD is involved in building the third meromycolic segment during the late FAS-II elongation cycles, leading to the synthesis of the full-size alpha- and epoxy-MAs. The change in the envelope composition induced by hadD inactivation strongly altered the bacterial fitness and capacities to aggregate, assemble into colonies or biofilms and spread by sliding motility, and conferred a hypersensitivity to the firstline antimycobacterial drug rifampicin. This showed that the cell surface properties and the envelope integrity were greatly affected. With the alarmingly increasing case number of nontuberculous mycobacterial diseases, HadD appears as an attractive target for drug development.
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Affiliation(s)
- Cyril Lefebvre
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Richard Boulon
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Manuelle Ducoux
- Département Biologie Structurale & Biophysique, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Sabine Gavalda
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Françoise Laval
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Stevie Jamet
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Nathalie Eynard
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Anne Lemassu
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Kaymeuang Cam
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Marie-Pierre Bousquet
- Département Biologie Structurale & Biophysique, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Fabienne Bardou
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Odile Burlet-Schiltz
- Département Biologie Structurale & Biophysique, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Mamadou Daffé
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France
| | - Annaïk Quémard
- Département Tuberculose & Biologie des Infections, Institut de Pharmacologie et de Biologie Structurale, UMR5089, Université de Toulouse, CNRS, UPS, 31077, Toulouse Cedex 04, France.
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Nonphotodynamic Roles of Methylene Blue: Display of Distinct Antimycobacterial and Anticandidal Mode of Actions. J Pathog 2018; 2018:3759704. [PMID: 29666708 PMCID: PMC5831920 DOI: 10.1155/2018/3759704] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 12/22/2017] [Accepted: 12/31/2017] [Indexed: 12/12/2022] Open
Abstract
Significance of methylene blue (MB) in photodynamic therapy against microbes is well established. Previously, we have reported the antifungal potential of MB against Candida albicans. The present study attempts to identify additional antimicrobial effect of MB against another prevalent human pathogen, Mycobacterium tuberculosis (MTB). We explored that MB is efficiently inhibiting the growth of Mycobacterium at 15.62 μg/ml albeit in bacteriostatic manner similar to its fungistatic nature. We uncovered additional cell surface phenotypes (colony morphology and cell sedimentation rate) which were impaired only in Mycobacterium. Mechanistic insights revealed that MB causes energy dependent membrane perturbation in both C. albicans and Mycobacterium. We also confirmed that MB leads to enhanced reactive oxygen species generation in both organisms that could be reversed upon antioxidant supplementation; however, DNA damage could only be observed in Mycobacterium. We provided evidence that although biofilm formation was disrupted in both organisms, cell adherence to human epithelial cells was inhibited only in Mycobacterium. Lastly, RT-PCR results showed good correlation with the biochemical assay. Together, apart from the well-established role of MB in photodynamic therapy, this study provides insights into the distinct antimicrobial mode of actions in two significant human pathogens, Candida and Mycobacterium, which can be extrapolated to improve our understanding of finding novel therapeutic options.
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Pal R, Hameed S, Sabareesh V, Kumar P, Singh S, Fatima Z. Investigations into Isoniazid Treated Mycobacterium tuberculosis by Electrospray Mass Spectrometry Reveals New Insights into Its Lipid Composition. J Pathog 2018; 2018:1454316. [PMID: 30018826 PMCID: PMC6029481 DOI: 10.1155/2018/1454316] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 04/11/2018] [Accepted: 04/18/2018] [Indexed: 02/07/2023] Open
Abstract
Many of the earlier studies involving the effect of isoniazid (INH) treatment have solely focused on the fatty acyl (FA) category of Mycobacterium tuberculosis (MTB) lipids. This motivated us with the major interest to examine the impact of INH on various other categories of MTB lipids. Towards this, we chose to interpret our mass spectral data (LC-ESI-MS) by a standalone software, MS-LAMP, in which "Mtb LipidDB" was integrated. Analysis by MS-LAMP revealed that INH treatment can alter the composition of "glycerolipids (GLs)" and "glycerophospholipids (GPLs)" categories of MTB lipids, in addition to the variations to FA category. Interpretation by "MycoMass" database yielded similar results as that of Mtb LipidDB, except that significant alterations to polyketides (PKs) category also were observed. Probing biosynthetic pathways of certain key lipids belonging to any of GLs, GPLs, and PKs categories can be attractive target(s) for drug discovery or can be useful to identify means to overcome drug resistance or to obtain insights into the causal factors of virulence. To the best of our knowledge, this is the first report hinting at the influence of INH on GLs, GPLs, and PKs of MTB.
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Affiliation(s)
- Rahul Pal
- 1Amity Institute of Biotechnology, Amity University Haryana, Gurugram, Manesar 122413, India
| | - Saif Hameed
- 1Amity Institute of Biotechnology, Amity University Haryana, Gurugram, Manesar 122413, India
| | - Varatharajan Sabareesh
- 2Advanced Centre for Bio Separation Technology (CBST), Vellore Institute of Technology (VIT), Vellore, Tamil Nadu 632014, India
| | - Parveen Kumar
- 3Division of Clinical Microbiology and Molecular Medicine, Department of Laboratory Medicine, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Sarman Singh
- 3Division of Clinical Microbiology and Molecular Medicine, Department of Laboratory Medicine, All India Institute of Medical Sciences, New Delhi 110029, India
| | - Zeeshan Fatima
- 1Amity Institute of Biotechnology, Amity University Haryana, Gurugram, Manesar 122413, India
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50
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Marini E, Di Giulio M, Magi G, Di Lodovico S, Cimarelli ME, Brenciani A, Nostro A, Cellini L, Facinelli B. Curcumin, an antibiotic resistance breaker against a multiresistant clinical isolate ofMycobacterium abscessus. Phytother Res 2017; 32:488-495. [DOI: 10.1002/ptr.5994] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 08/09/2017] [Accepted: 11/01/2017] [Indexed: 01/31/2023]
Affiliation(s)
- Emanuela Marini
- Unit of Microbiology, Department of Biomedical Sciences and Public Health; Polytechnic University of Marche; Ancona Italy
| | - Mara Di Giulio
- Department of Pharmacy; “G. d'Annunzio” University of Chieti-Pescara; Chieti Italy
| | - Gloria Magi
- Unit of Microbiology, Department of Biomedical Sciences and Public Health; Polytechnic University of Marche; Ancona Italy
| | - Silvia Di Lodovico
- Department of Pharmacy; “G. d'Annunzio” University of Chieti-Pescara; Chieti Italy
| | | | - Andrea Brenciani
- Unit of Microbiology, Department of Biomedical Sciences and Public Health; Polytechnic University of Marche; Ancona Italy
| | - Antonia Nostro
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences; University of Messina; Messina Italy
| | - Luigina Cellini
- Department of Pharmacy; “G. d'Annunzio” University of Chieti-Pescara; Chieti Italy
| | - Bruna Facinelli
- Unit of Microbiology, Department of Biomedical Sciences and Public Health; Polytechnic University of Marche; Ancona Italy
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