1
|
Fu Y, Maaβ S, Cavallo FM, de Jong A, Raangs E, Westra J, Buist G, Becher D, van Dijl JM. Differential Virulence of Aggregatibacter actinomycetemcomitans Serotypes Explained by Exoproteome Heterogeneity. Microbiol Spectr 2023; 11:e0329822. [PMID: 36541765 PMCID: PMC9927298 DOI: 10.1128/spectrum.03298-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 12/02/2022] [Indexed: 12/24/2022] Open
Abstract
Aggregatibacter actinomycetemcomitans (Aa) is a Gram-negative bacterial pathogen associated with periodontitis and nonoral diseases like rheumatoid arthritis and Alzheimer´s disease. Aa isolates with the serotypes a, b, and c are globally most prevalent. Importantly, isolates displaying these serotypes have different clinical presentations. While serotype b isolates are predominant in severe periodontitis, serotypes a and c are generally encountered in mild periodontitis or healthy individuals. It is currently unknown how these differences are reflected in the overall secretion of virulence factors. Therefore, this study was aimed at a comparative analysis of exoproteomes from different clinical Aa isolates with serotypes a, b, or c by mass spectrometry, and a subsequent correlation of the recorded exoproteome profiles with virulence. Overall, we identified 425 extracellular proteins. Significant differences in the exoproteome composition of isolates with different serotypes were observed in terms of protein identification and abundance. In particular, serotype a isolates presented more extracellular proteins than serotype b or c isolates. These differences are mirrored in their virulence in infection models based on human salivary gland epithelial cells and neutrophils. Remarkably, serotype a isolates displayed stronger adhesive capabilities and induced more lysis of epithelial cells and neutrophils than serotype b or c isolates. Conversely, serotype c isolates showed relatively low leukotoxicity, while provoking NETosis to similar extents as serotype a and b isolates. Altogether, we conclude that the differential virulence presentation by Aa isolates with the dominant serotypes a, b, or c can be explained by their exoproteome heterogeneity. IMPORTANCE Periodontitis is an inflammatory disease that causes progressive destruction of alveolar bone and supporting tissues around the teeth, ultimately resulting in tooth loss. The bacterium Aggregatibacter actinomycetemcomitans (Aa) is a prevalent causative agent of periodontitis, but this oral pathogen is also associated with serious extraoral diseases like rheumatoid arthritis and Alzheimer's disease. Clinical Aa isolates are usually distinguished by serotyping, because of known serotype-specific differences in virulence. Aa with serotype b is associated with aggressive forms of periodontitis, while isolates with serotypes a or c are usually encountered in cases of mild periodontitis or healthy individuals. The molecular basis for these differences in virulence was so far unknown. In the present study, we pinpoint serotype-specific differences in virulence factor production by clinical Aa isolates. We consider these findings important, because they provide new leads for future preventive or therapeutic approaches to fight periodontitis and associated morbidities.
Collapse
Affiliation(s)
- Yanyan Fu
- University of Groningen, University Medical Center Groningen, Department of Medical Microbiology, Groningen, the Netherlands
| | - Sandra Maaβ
- University of Greifswald, Institute of Microbiology, Department of Microbial Proteomics, Greifswald, Germany
| | - Francis M. Cavallo
- University of Groningen, University Medical Center Groningen, Department of Medical Microbiology, Groningen, the Netherlands
| | - Anne de Jong
- University of Groningen, Groningen Biomolecular Sciences and Biotechnology Institute, Department of Molecular Genetics, Groningen, the Netherlands
| | - Erwin Raangs
- University of Groningen, University Medical Center Groningen, Department of Medical Microbiology, Groningen, the Netherlands
| | - Johanna Westra
- University of Groningen, University Medical Center Groningen, Department of Rheumatology and Clinical Immunology, Groningen, the Netherlands
| | - Girbe Buist
- University of Groningen, University Medical Center Groningen, Department of Medical Microbiology, Groningen, the Netherlands
| | - Dörte Becher
- University of Greifswald, Institute of Microbiology, Department of Microbial Proteomics, Greifswald, Germany
| | - Jan Maarten van Dijl
- University of Groningen, University Medical Center Groningen, Department of Medical Microbiology, Groningen, the Netherlands
| |
Collapse
|
2
|
Connections between Exoproteome Heterogeneity and Virulence in the Oral Pathogen Aggregatibacter actinomycetemcomitans. mSystems 2022; 7:e0025422. [PMID: 35695491 PMCID: PMC9239275 DOI: 10.1128/msystems.00254-22] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Aggregatibacter actinomycetemcomitans is a Gram-negative bacterial pathogen associated with severe periodontitis and nonoral diseases. Clinical isolates of A. actinomycetemcomitans display a rough (R) colony phenotype with strong adherent properties. Upon prolonged culturing, nonadherent strains with a smooth (S) colony phenotype emerge. To date, most virulence studies on A. actinomycetemcomitans have been performed with S strains of A. actinomycetemcomitans, whereas the virulence of clinical R isolates has received relatively little attention. Since the extracellular proteome is the main bacterial reservoir of virulence factors, the present study was aimed at a comparative analysis of this subproteome fraction for a collection of R isolates and derivative S strains, in order to link particular proteins to the virulence of A. actinomycetemcomitans with serotype b. To assess the bacterial virulence, we applied different infection models based on larvae of the greater wax moth Galleria mellonella, a human salivary gland-derived epithelial cell line, and freshly isolated neutrophils from healthy human volunteers. A total number of 351 extracellular A. actinomycetemcomitans proteins was identified by mass spectrometry, with the S strains consistently showing more extracellular proteins than their parental R isolates. A total of 50 known extracellular virulence factors was identified, of which 15 were expressed by all investigated bacteria. Importantly, the comparison of differences in exoproteome composition and virulence highlights critical roles of 10 extracellular proteins in the different infection models. Together, our findings provide novel clues for understanding the virulence of A. actinomycetemcomitans and for development of potential preventive or therapeutic avenues to neutralize this important oral pathogen. IMPORTANCE Periodontitis is one of the most common inflammatory diseases worldwide, causing high morbidity and decreasing the quality of life of millions of people. The bacterial pathogen Aggregatibacter actinomycetemcomitans is strongly associated with aggressive forms of periodontitis. Moreover, it has been implicated in serious nonoral infections, including endocarditis and brain abscesses. Therefore, it is important to investigate how A. actinomycetemcomitans can cause disease. In the present study, we applied a mass spectrometry approach to make an inventory of the virulence factors secreted by different clinical A. actinomycetemcomitans isolates and derivative strains that emerged upon culturing. We subsequently correlated the secreted virulence factors to the pathogenicity of the investigated bacteria in different infection models. The results show that a limited number of extracellular virulence factors of A. actinomycetemcomitans have central roles in pathogenesis, indicating that they could be druggable targets to prevent or treat oral disease.
Collapse
|
3
|
Wang J, Wang J, Wang Y, Sun P, Zou X, Ren L, Zhang C, Liu E. Protein expression profiles in methicillin-resistant Staphylococcus aureus (MRSA) under effects of subminimal inhibitory concentrations of imipenem. FEMS Microbiol Lett 2019; 366:5570583. [PMID: 31529016 DOI: 10.1093/femsle/fnz195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 09/12/2019] [Indexed: 12/25/2022] Open
Abstract
Imipenem is a beta-lactam antibiotic mainly active against gram-negative bacterial pathogens and also could cause cell wall impairment in methicillin-resistant Staphylococcus aureus(MRSA). However, related antibacterial mechanisms of imipenem on MRSA and mixed infections of MRSA and gram-negative bacteria are relatively poorly revealed. This study was to identify proteins in the MRSA response to subminimal inhibitory concentrations (sub-MICs) of imipenem treatment. Our results showed that 240 and 58 different expression proteins (DEPs) in sub-MICs imipenem-treated S3 (a standard MRSA strain) and S23 (a clinical MRSA strain) strains were identified through the isobaric tag for relative and absolute quantitation method when compared with untreated S3 and S23 strains, respectively, which was further confirmed by multiple reactions monitoring. Our result also demonstrated that expressions of multiple DEPs involved in cellular proliferation, metabolism and virulence were significantly changed in S3 and S23 strains, which was proved by gene ontology annotations and qPCR analysis. Further, transmission electron microscopy and scanning electron microscopy analysis showed cell wall deficiency, cell lysis and abnormal nuclear mitosis on S23 strain. Our study provides important information for understanding the antibacterial mechanisms of imipenem on MRSA and for better usage of imipenem on patients co-infected with MRSA and other multidrug-resistant gram-negative bacteria.
Collapse
Affiliation(s)
- Jichun Wang
- Department of Respiratory Medicine, Children's Hospital of Chongqing Medical University, No. 136, Zhongshan 2nd Road, Yuzhong District, Chongqing 400014, China.,Department of Pediatrics, Affiliated Hospital of Inner Mongolia Medical University, No. 1, Tongdao North Street, Huimin District, Hohhot, Inner Mongolia 010050, China
| | - Junrui Wang
- Clinical Laboratory, Affiliated Hospital of Inner Mongolia Medical University, No. 1, Tongdao North Street, Huimin District, Hohhot, Inner Mongolia 010050, China
| | - Yanyan Wang
- Clinical Laboratory, Affiliated Hospital of Inner Mongolia Medical University, No. 1, Tongdao North Street, Huimin District, Hohhot, Inner Mongolia 010050, China
| | - Peng Sun
- Pathogen and Immunity Research Center, College of Basic Medicine, Inner Mongolia Medical University, Jinshan Avenue, Hohhot, Inner Mongolia 010110, China
| | - Xiaohui Zou
- Chinese National Influenza Center, National Institute for Viral Disease Control and Prevention; China CDC, Key Laboratory for Medical Virology, Ministry of Health, Beijing 102206, China
| | - Luo Ren
- Pediatrics Institute, Children's Hospital Chongqing Medical University, No. 136, Zhong Shan 2nd Road, Yuzhong District, Chongqing 400014, China
| | - Chunxia Zhang
- Department of Pediatrics, Affiliated Hospital of Inner Mongolia Medical University, No. 1, Tongdao North Street, Huimin District, Hohhot, Inner Mongolia 010050, China
| | - Enmei Liu
- Pediatrics Institute, Children's Hospital Chongqing Medical University, No. 136, Zhong Shan 2nd Road, Yuzhong District, Chongqing 400014, China
| |
Collapse
|
4
|
Stobernack T, Glasner C, Junker S, Gabarrini G, de Smit M, de Jong A, Otto A, Becher D, van Winkelhoff AJ, van Dijl JM. Extracellular Proteome and Citrullinome of the Oral Pathogen Porphyromonas gingivalis. J Proteome Res 2016; 15:4532-4543. [DOI: 10.1021/acs.jproteome.6b00634] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Tim Stobernack
- Department
of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen 9700 RB, The Netherlands
| | - Corinna Glasner
- Department
of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen 9700 RB, The Netherlands
| | - Sabryna Junker
- Institute
for Microbiology, Ernst-Moritz-Arndt-University Greifswald, Greifswald 17489, Germany
| | - Giorgio Gabarrini
- Department
of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen 9700 RB, The Netherlands
- Center
for Dentistry and Oral Hygiene, Department of Periodontology, University of Groningen, University Medical Center Groningen, Groningen 9700 RB, The Netherlands
| | - Menke de Smit
- Center
for Dentistry and Oral Hygiene, Department of Periodontology, University of Groningen, University Medical Center Groningen, Groningen 9700 RB, The Netherlands
| | - Anne de Jong
- Department
of Molecular Genetics, University of Groningen, Groningen 9700 AB, The Netherlands
| | - Andreas Otto
- Institute
for Microbiology, Ernst-Moritz-Arndt-University Greifswald, Greifswald 17489, Germany
| | - Dörte Becher
- Institute
for Microbiology, Ernst-Moritz-Arndt-University Greifswald, Greifswald 17489, Germany
| | - Arie Jan van Winkelhoff
- Department
of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen 9700 RB, The Netherlands
- Center
for Dentistry and Oral Hygiene, Department of Periodontology, University of Groningen, University Medical Center Groningen, Groningen 9700 RB, The Netherlands
| | - Jan Maarten van Dijl
- Department
of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen 9700 RB, The Netherlands
| |
Collapse
|
5
|
Quach DT, Sakoulas G, Nizet V, Pogliano J, Pogliano K. Bacterial Cytological Profiling (BCP) as a Rapid and Accurate Antimicrobial Susceptibility Testing Method for Staphylococcus aureus. EBioMedicine 2016; 4:95-103. [PMID: 26981574 PMCID: PMC4776060 DOI: 10.1016/j.ebiom.2016.01.020] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 01/07/2016] [Accepted: 01/15/2016] [Indexed: 12/01/2022] Open
Abstract
Successful treatment of bacterial infections requires the timely administration of appropriate antimicrobial therapy. The failure to initiate the correct therapy in a timely fashion results in poor clinical outcomes, longer hospital stays, and higher medical costs. Current approaches to antibiotic susceptibility testing of cultured pathogens have key limitations ranging from long run times to dependence on prior knowledge of genetic mechanisms of resistance. We have developed a rapid antimicrobial susceptibility assay for Staphylococcus aureus based on bacterial cytological profiling (BCP), which uses quantitative fluorescence microscopy to measure antibiotic induced changes in cellular architecture. BCP discriminated between methicillin-susceptible (MSSA) and -resistant (MRSA) clinical isolates of S. aureus (n = 71) within 1–2 h with 100% accuracy. Similarly, BCP correctly distinguished daptomycin susceptible (DS) from daptomycin non-susceptible (DNS) S. aureus strains (n = 20) within 30 min. Among MRSA isolates, BCP further identified two classes of strains that differ in their susceptibility to specific combinations of beta-lactam antibiotics. BCP provides a rapid and flexible alternative to gene-based susceptibility testing methods for S. aureus, and should be readily adaptable to different antibiotics and bacterial species as new mechanisms of resistance or multidrug-resistant pathogens evolve and appear in mainstream clinical practice. Bacterial cytological profiling identifies antibiotic resistant S. aureus. BCP predicts best treatment options for multidrug resistant MRSA. Resistant strains are correctly identified within 1 h. BCP does not require prior knowledge of resistance mechanism.
There is a great need for rapid antimicrobial susceptibility testing (AST) as it can dramatically improve clinical outcome for bacterial infections. Most currently proposed ASTs are dependent on knowledge of known resistance genes or based solely on growth/lysis. We have developed a new diagnostic method for rapidly determining antibiotic susceptibility of Staphylococcus aureus using quantitative fluorescence microscopy to measure antibiotic induced changes in cellular architecture. Our test has the potential to change the way antibiotic susceptibility testing is done in the future and is readily adaptable to different antibiotics and bacterial species regardless of the mechanisms of resistance.
Collapse
Affiliation(s)
- D T Quach
- Department of Bioengineering, University of California, San Diego La Jolla, CA, USA; Division of Biological Sciences, University of California, San Diego La Jolla, CA, USA
| | - G Sakoulas
- Division of Pediatric Pharmacology & Drug Discovery, University of California, San Diego La Jolla, CA, USA
| | - V Nizet
- Division of Pediatric Pharmacology & Drug Discovery, University of California, San Diego La Jolla, CA, USA; Skaggs School of Pharmacy and Pharmaceutical Science, University of California, San Diego La Jolla, CA, USA
| | - J Pogliano
- Division of Biological Sciences, University of California, San Diego La Jolla, CA, USA
| | - K Pogliano
- Division of Biological Sciences, University of California, San Diego La Jolla, CA, USA
| |
Collapse
|
6
|
Çelik A, Aydınlık N, Arslan I. Phytochemical Constituents and Inhibitory Activity towards Methicillin-Resistant Staphylococcus aureus Strains of Eryngium Species (Apiaceae). Chem Biodivers 2011; 8:454-9. [DOI: 10.1002/cbdv.201000124] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
7
|
Vignaroli C, Biavasco F, Varaldo PE. Interactions between glycopeptides and beta-lactams against isogenic pairs of teicoplanin-susceptible and -resistant strains of Staphylococcus haemolyticus. Antimicrob Agents Chemother 2006; 50:2577-82. [PMID: 16801450 PMCID: PMC1489795 DOI: 10.1128/aac.00260-06] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Four isogenic derivatives with stably increased glycopeptide MICs (all become resistant to teicoplanin) were obtained from four glycopeptide-susceptible clinical isolates of Staphylococcus haemolyticus. All strains were extensively analyzed and compared for a number of distinctive features. In particular, the results provided insights into the puzzling issue of antistaphylococcal interactions between glycopeptides and beta-lactams, especially the paradox of double zones around beta-lactam disks and the relationships between autolysis rate and type of interaction.
Collapse
Affiliation(s)
- Carla Vignaroli
- Institute of Microbiology and Biomedical Sciences, Polytechnic University of Marche, 60131 Ancona, Italy
| | - Francesca Biavasco
- Institute of Microbiology and Biomedical Sciences, Polytechnic University of Marche, 60131 Ancona, Italy
| | - Pietro E. Varaldo
- Institute of Microbiology and Biomedical Sciences, Polytechnic University of Marche, 60131 Ancona, Italy
- Corresponding author. Mailing address: Institute of Microbiology and Biomedical Sciences, Polytechnic University of Marche, Via Ranieri, Monte d'Ago, 60131 Ancona, Italy. Phone: 39 071 2204694. Fax: 39 071 2204693. E-mail:
| |
Collapse
|
8
|
Jacqueline C, Navas D, Batard E, Miegeville AF, Le Mabecque V, Kergueris MF, Bugnon D, Potel G, Caillon J. In vitro and in vivo synergistic activities of linezolid combined with subinhibitory concentrations of imipenem against methicillin-resistant Staphylococcus aureus. Antimicrob Agents Chemother 2005; 49:45-51. [PMID: 15616274 PMCID: PMC538916 DOI: 10.1128/aac.49.1.45-51.2005] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Indifference or moderate antagonism of linezolid combined with other antibiotics in vitro and in vivo have mainly been reported in the literature. We have assessed the in vitro activities of linezolid, alone or in combination with imipenem, against methicillin-resistant Staphylococcus aureus (MRSA) strains using the dynamic checkerboard and time-kill curve methods. Linezolid and low concentrations of imipenem had a synergistic effect, leading us to evaluate the in vivo antibacterial activity of the combination using the rabbit endocarditis experimental model. Two MRSA strains were used for in vivo experiments: one was a heterogeneous glycopeptide-intermediate clinical S. aureus strain isolated from blood cultures, and the other was the S. aureus COL reference strain. Animals infected with one of two MRSA strains were randomly assigned to one of the following treatments: no treatment (controls), linezolid (simulating a dose in humans of 10 mg/kg of body weight every 12 h), a constant intravenous infusion of imipenem (which allowed the steady-state concentration of about 1/32 the MIC of imipenem for each strain to be reached in serum), or the combination of both treatments. Linezolid and imipenem as monotherapies exhibited no bactericidal activity against either strain. The combination of linezolid plus imipenem showed in vivo bactericidal activity that corresponded to a decrease of at least 4.5 log CFU/g of vegetation compared to the counts for the controls. In conclusion, the combination exhibited synergistic and bactericidal activities against two MRSA strains after 5 days of treatment. The combination of linezolid plus imipenem appears to be promising for the treatment of severe MRSA infections and merits further investigations to explore the mechanism underlying the synergy between the two drugs.
Collapse
Affiliation(s)
- Cédric Jacqueline
- Laboratoire d'Antibiologie, UER de Médecine, 1 rue Gaston Veil, 44035 Nantes, Cedex 01, France
| | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Katayama Y, Zhang HZ, Chambers HF. Effect of disruption of Staphylococcus aureus PBP4 gene on resistance to beta-lactam antibiotics. Microb Drug Resist 2004; 9:329-36. [PMID: 15000739 DOI: 10.1089/107662903322762752] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Penicillin-binding proteins (PBPs) mediate susceptibility to beta-lactam antibiotics. PBP 4, although not essential for survival, has been associated with low-level resistance to beta-lactam antibiotics. To determine its contribution to survival of Staphylococcus aureus cells exposed to beta-lactams, the PBP 4 gene (pbp4) was disrupted and then complemented in the methicillin-susceptible strain RN4220 and the homogeneous methicillin-resistant strain COL. Depending on the antibiotic tested, the presence or absence of an intact pbp4 has no effect or only a modest effect on growth measured by population analysis. These data indicate that PBP 4 is a relatively unimportant target of beta-lactams not only in methicillin-susceptible but also methicillin-resistant S. aureus.
Collapse
Affiliation(s)
- Yuki Katayama
- Division of Infectious Diseases, San Francisco General Hospital, Department of Medicine, University of California San Francisco, San Francisco, CA 94110, USA
| | | | | |
Collapse
|