101
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Horng YT, Wang CJ, Chung WT, Chao HJ, Chen YY, Soo PC. Phosphoenolpyruvate phosphotransferase system components positively regulate Klebsiella biofilm formation. JOURNAL OF MICROBIOLOGY, IMMUNOLOGY, AND INFECTION = WEI MIAN YU GAN RAN ZA ZHI 2018; 51:174-183. [DOI: 10.1016/j.jmii.2017.01.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 01/07/2017] [Accepted: 01/24/2017] [Indexed: 02/02/2023]
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102
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Marcoleta AE, Varas MA, Ortiz-Severín J, Vásquez L, Berríos-Pastén C, Sabag AV, Chávez FP, Allende ML, Santiviago CA, Monasterio O, Lagos R. Evaluating Different Virulence Traits of Klebsiella pneumoniae Using Dictyostelium discoideum and Zebrafish Larvae as Host Models. Front Cell Infect Microbiol 2018; 8:30. [PMID: 29479519 PMCID: PMC5811510 DOI: 10.3389/fcimb.2018.00030] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 01/23/2018] [Indexed: 01/26/2023] Open
Abstract
Multiresistant and invasive hypervirulent Klebsiella pneumoniae strains have become one of the most urgent bacterial pathogen threats. Recent analyses revealed a high genomic plasticity of this species, harboring a variety of mobile genetic elements associated with virulent strains, encoding proteins of unknown function whose possible role in pathogenesis have not been addressed. K. pneumoniae virulence has been studied mainly in animal models such as mice and pigs, however, practical, financial, ethical and methodological issues limit the use of mammal hosts. Consequently, the development of simple and cost-effective experimental approaches with alternative host models is needed. In this work we described the use of both, the social amoeba and professional phagocyte Dictyostelium discoideum and the fish Danio rerio (zebrafish) as surrogate host models to study K. pneumoniae virulence. We compared three K. pneumoniae clinical isolates evaluating their resistance to phagocytosis, intracellular survival, lethality, intestinal colonization, and innate immune cells recruitment. Optical transparency of both host models permitted studying the infective process in vivo, following the Klebsiella-host interactions through live-cell imaging. We demonstrated that K. pneumoniae RYC492, but not the multiresistant strains 700603 and BAA-1705, is virulent to both host models and elicits a strong immune response. Moreover, this strain showed a high resistance to phagocytosis by D. discoideum, an increased ability to form biofilms and a more prominent and irregular capsule. Besides, the strain 700603 showed the unique ability to replicate inside amoeba cells. Genomic comparison of the K. pneumoniae strains showed that the RYC492 strain has a higher overall content of virulence factors although no specific genes could be linked to its phagocytosis resistance, nor to the intracellular survival observed for the 700603 strain. Our results indicate that both zebrafish and D. discoideum are advantageous host models to study different traits of K. pneumoniae that are associated with virulence.
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Affiliation(s)
- Andrés E Marcoleta
- Laboratorio de Biología Estructural y Molecular, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Macarena A Varas
- Laboratorio de Biología Estructural y Molecular, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Javiera Ortiz-Severín
- Laboratorio de Microbiología de Sistemas, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Leonardo Vásquez
- Laboratorio de Biología Estructural y Molecular, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Camilo Berríos-Pastén
- Laboratorio de Biología Estructural y Molecular, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Andrea V Sabag
- Laboratorio de Microbiología, Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Francisco P Chávez
- Laboratorio de Microbiología de Sistemas, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Miguel L Allende
- Departamento de Biología, Facultad de Ciencias, Centro FONDAP de Regulación del Genoma, Universidad de Chile, Santiago, Chile
| | - Carlos A Santiviago
- Laboratorio de Microbiología, Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Octavio Monasterio
- Laboratorio de Biología Estructural y Molecular, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Rosalba Lagos
- Laboratorio de Biología Estructural y Molecular, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
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103
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Dong N, Zhang R, Liu L, Li R, Lin D, Chan EWC, Chen S. Genome analysis of clinical multilocus sequence Type 11 Klebsiella pneumoniae from China. Microb Genom 2018; 4. [PMID: 29424684 PMCID: PMC5857376 DOI: 10.1099/mgen.0.000149] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The increasing prevalence of KPC-producing Klebsiella pneumoniae strains in clinical settings has been largely attributed to dissemination of organisms of specific multilocus sequence types, such as ST258 and ST11. Compared with the ST258 clone, which is prevalent in North America and Europe, ST11 is common in China but information regarding its genetic features remains scarce. In this study, we performed detailed genetic characterization of ST11 K. pneumoniae strains by analyzing whole-genome sequences of 58 clinical strains collected from diverse geographic locations in China. The ST11 genomes were found to be highly heterogeneous and clustered into at least three major lineages based on the patterns of single-nucleotide polymorphisms. Exhibiting five different capsular types, these ST11 strains were found to harbor multiple resistance and virulence determinants such as the blaKPC-2 gene, which encodes carbapenemase, and the yersiniabactin-associated virulence genes irp, ybt and fyu. Moreover, genes encoding the virulence factor aerobactin and the regulator of the mucoid phenotype (rmpA) were detectable in six genomes, whereas genes encoding salmochelin were found in three genomes. In conclusion, our data indicated that carriage of a wide range of resistance and virulence genes constitutes the underlying basis of the high level of prevalence of ST11 in clinical settings. Such findings provide insight into the development of novel strategies for prevention, diagnosis and treatment of K. pneumoniae infections.
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Affiliation(s)
- Ning Dong
- 1Shenzhen Key lab for Food Biological Safety Control, Food Safety and Technology Research Center, Hong Kong PolyU Shen Zhen Research Institute, Shenzhen, PR China.,2State Key Lab of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom,Kowloon, Hong Kong SAR
| | - Rong Zhang
- 3Second Affiliated Hospital of Zhejiang University, hospital of Zhejiang University, Hangzhou, PR China
| | - Lizhang Liu
- 1Shenzhen Key lab for Food Biological Safety Control, Food Safety and Technology Research Center, Hong Kong PolyU Shen Zhen Research Institute, Shenzhen, PR China
| | - Ruichao Li
- 1Shenzhen Key lab for Food Biological Safety Control, Food Safety and Technology Research Center, Hong Kong PolyU Shen Zhen Research Institute, Shenzhen, PR China.,2State Key Lab of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom,Kowloon, Hong Kong SAR
| | - Dachuan Lin
- 1Shenzhen Key lab for Food Biological Safety Control, Food Safety and Technology Research Center, Hong Kong PolyU Shen Zhen Research Institute, Shenzhen, PR China.,2State Key Lab of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom,Kowloon, Hong Kong SAR
| | - Edward Wai-Chi Chan
- 2State Key Lab of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom,Kowloon, Hong Kong SAR
| | - Sheng Chen
- 2State Key Lab of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom,Kowloon, Hong Kong SAR.,1Shenzhen Key lab for Food Biological Safety Control, Food Safety and Technology Research Center, Hong Kong PolyU Shen Zhen Research Institute, Shenzhen, PR China
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104
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105
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Vuotto C, Longo F, Pascolini C, Donelli G, Balice M, Libori M, Tiracchia V, Salvia A, Varaldo P. Biofilm formation and antibiotic resistance inKlebsiella pneumoniaeurinary strains. J Appl Microbiol 2017; 123:1003-1018. [DOI: 10.1111/jam.13533] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 06/15/2017] [Accepted: 07/06/2017] [Indexed: 01/09/2023]
Affiliation(s)
- C. Vuotto
- Microbial Biofilm Laboratory; Fondazione Santa Lucia; Rome Italy
| | - F. Longo
- Microbial Biofilm Laboratory; Fondazione Santa Lucia; Rome Italy
| | - C. Pascolini
- Microbial Biofilm Laboratory; Fondazione Santa Lucia; Rome Italy
| | - G. Donelli
- Microbial Biofilm Laboratory; Fondazione Santa Lucia; Rome Italy
| | - M.P. Balice
- Microbiological Laboratory; Fondazione Santa Lucia; Rome Italy
| | - M.F. Libori
- Microbiological Laboratory; Fondazione Santa Lucia; Rome Italy
| | - V. Tiracchia
- Microbiological Laboratory; Fondazione Santa Lucia; Rome Italy
| | - A. Salvia
- Medical Services; Fondazione Santa Lucia; Rome Italy
| | - P.E. Varaldo
- Department of Biomedical Sciences and Public Health; Section of Microbiology; Marche Polytechnic University Medical School; Torrette di Ancona Italy
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106
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A Serendipitous Mutation Reveals the Severe Virulence Defect of a Klebsiella pneumoniae fepB Mutant. mSphere 2017; 2:mSphere00341-17. [PMID: 28861522 PMCID: PMC5566837 DOI: 10.1128/msphere.00341-17] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 08/01/2017] [Indexed: 12/16/2022] Open
Abstract
Klebsiella pneumoniae is considered a significant public health threat because of the emergence of multidrug-resistant strains and the challenge associated with treating life-threatening infections. Capsule, siderophores, and adhesins have been implicated as virulence determinants of K. pneumoniae, yet we lack a clear understanding of how this pathogen causes disease. In a previous screen for virulence genes, we identified a potential new virulence locus and constructed a mutant (smr) with this locus deleted. In this study, we characterize the smr mutant and show that this mutation renders K. pneumoniae avirulent in a pneumonia model of infection. The smr mutant was expected to have a deletion of three genes, but subsequent genome sequencing indicated that a much larger deletion had occurred. Further analysis of the deleted region indicated that the virulence defect of the smr mutant could be attributed to the loss of FepB, a periplasmic protein required for import of the siderophore enterobactin. Interestingly, a ΔfepB mutant was more attenuated than a mutant unable to synthesize enterobactin, suggesting that additional processes are affected. As FepB is highly conserved among the members of the family Enterobacteriaceae, therapeutic targeting of FepB may be useful for the treatment of Klebsiella and other bacterial infections. IMPORTANCE In addition to having a reputation as the causative agent of several types of hospital-acquired infections, Klebsiella pneumoniae has gained widespread attention as a pathogen with a propensity for acquiring antibiotic resistance. It is capable of causing a range of infections, including urinary tract infections, pneumonia, and sepsis. Because of the rapid emergence of carbapenem resistance among Klebsiella strains, there is a dire need for a better understanding of virulence mechanisms and identification of new drug targets. Here, we identify the periplasmic transporter FepB as one such potential target.
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107
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Rodrigues C, Novais Â, Sousa C, Ramos H, Coque TM, Cantón R, Lopes JA, Peixe L. Elucidating constraints for differentiation of major human Klebsiella pneumoniae clones using MALDI-TOF MS. Eur J Clin Microbiol Infect Dis 2016; 36:379-386. [PMID: 27812805 DOI: 10.1007/s10096-016-2812-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 10/10/2016] [Indexed: 11/29/2022]
Abstract
The establishment of matrix-assisted laser desorption time-of-flight mass spectrometry (MALDI-TOF MS) in routine microbial identification boosted many developments towards high-throughput applications, including bacterial typing. However, results are still controversial for different bacterial species. We aim to evaluate the suitability of MALDI-TOF MS for typing clinically relevant multidrug resistant (MDR) Klebsiella pneumoniae subsp. pneumoniae clones using routine conditions and a previously validated chemometric analysis workflow. Mass spectra of 83 K. pneumoniae clinical isolates representing major human MDR clones [11 sequence types (STs), 22 PFGE-types] recovered in Portugal and Spain during outbreaks and non-outbreak situations (2003-2012) were obtained from cell extracts (CE) and intact cells (IC), and analysed with different chemometric tools. We observed a highly consistent peak pattern among isolates from different clones either with CE or IC, suggesting a high degree of conservation of biomolecules analysed (a large part corresponding to ribosomal proteins). Moreover, the low degree of agreement between MALDI-TOF MS and other methods (from 34.9 % to 43.4 % of correct assignments for CE and from 40.8 % to 70.1 % for IC) corroborates the low discriminatory potential of the technique at infraspecies level. Our results suggest a low discriminatory power of MALDI-TOF MS for clinically relevant MDR K. pneumoniae clones and highlight the need of developing tools for high-resolution typing in this species.
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Affiliation(s)
- C Rodrigues
- UCIBIO-REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Rua Jorge de Viterbo Ferreira, n. 228, 4050-313, Porto, Portugal
| | - Â Novais
- UCIBIO-REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Rua Jorge de Viterbo Ferreira, n. 228, 4050-313, Porto, Portugal
| | - C Sousa
- LAQV-REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto, Portugal
| | - H Ramos
- Serviço de Microbiologia, Centro Hospitalar do Porto, Porto, Portugal
| | - T M Coque
- Servicio de Microbiologia, Hospital Universitario Ramón y Cajal and Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain.,CIBER Epidemiología y Salud Pública, Madrid, Spain
| | - R Cantón
- Servicio de Microbiologia, Hospital Universitario Ramón y Cajal and Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain.,Red Española de Investigación en Patología Infecciosa (REIPI), Madrid, Spain
| | - J A Lopes
- Research Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Lisboa, Portugal
| | - L Peixe
- UCIBIO-REQUIMTE, Laboratório de Microbiologia, Faculdade de Farmácia, Universidade do Porto, Rua Jorge de Viterbo Ferreira, n. 228, 4050-313, Porto, Portugal.
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