1
|
Liu W, Liu Y, Xiao Z, Jin L, Wu M. Ultrasensitive electrochemiluminescence biosensor based on polymethylene blue nanoparticles and DNA network for Staphylococcus aureus detection. Food Chem 2024; 442:138471. [PMID: 38278101 DOI: 10.1016/j.foodchem.2024.138471] [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: 09/12/2023] [Revised: 01/11/2024] [Accepted: 01/15/2024] [Indexed: 01/28/2024]
Abstract
A novel bipolar electrode (BPE)-electrochemiluminescence (ECL) device was constructed for the ultra-sensitive detection of Staphylococcus aureus (S. aureus) by combining polymerase chain reaction (PCR) amplification and DNA network-loaded polymethylene blue nanoparticles (pMB NPs). The presence of target triggered the dissociation of double-stranded DNA on Fe3O4 NPs and the release of T strand, which initiated the PCR. The PCR product contains two protruding single-stranded DNA fragments that serve as bridges to connect Au NPs labeled probes. The PCR-Au products were captured by the probes on cathode of BPE to form three-dimensional DNA networks, which offer multiple adsorption sites for pMB NPs, leading to the remarkable enhancement of ECL intensity. Under optimal circumstances, a wide linear range from 10 to 108 CFU/mL and a low detection limit of 0.78 CFU/mL were achieved. This research opens new horizons for the application of PCR-based biosensors for the accurate and sensitive measurement of pathogenic bacteria.
Collapse
Affiliation(s)
- Weishuai Liu
- Department of Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, PR China
| | - Yujing Liu
- College of Life Sciences, Nanjing Agriculture University, 1 Weigang, Nanjing 210095, PR China
| | - Ziying Xiao
- Department of Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, PR China
| | - Longsheng Jin
- Department of Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, PR China
| | - Meisheng Wu
- Department of Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, PR China.
| |
Collapse
|
2
|
Ngiam JN, Koh MCY, Archuleta S, Fisher D, Chai LYA, Sia CH, Kong WKF, Tambyah PA. Performance of Risk Scores in Predicting Infective Endocarditis in Patients with Staphylococcus aureus Bacteraemia in a Prospective Asian Cohort. J Clin Med 2024; 13:2947. [PMID: 38792488 PMCID: PMC11122131 DOI: 10.3390/jcm13102947] [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: 03/01/2024] [Revised: 05/11/2024] [Accepted: 05/14/2024] [Indexed: 05/26/2024] Open
Abstract
Background: Several risk scores have been derived to predict the risk of infective endocarditis (IE) amongst patients with Staphylococcus aureus bacteraemia (SAB), which helps to guide clinical management. Methods: We prospectively studied 634 patients admitted with SAB. The cohort was stratified into those with or without IE, and the PREDICT Day 1, Day 5 and VIRSTA scores were tabulated. Area under the receiver operating characteristic (AUC) curves were constructed to compare the performance of each score. Results: Of the 634 patients examined, 36 (5.7%) had IE. These patients were younger (51.6 ± 20.1 vs. 59.2 ± 18.0 years, p = 0.015), tended to have community acquisition of bacteraemia (41.7% vs. 17.9%, p < 0.001), and had persistent bacteraemia beyond 72 h (19.4% vs. 6.0%, p = 0.002). The VIRSTA score had the best performance in predicting IE (AUC 0.76, 95%CI 0.66-0.86) compared with PREDICT Day 1 and Day 5. A VIRSTA score of <3 had the best negative predictive value (97.5%), compared with PREDICT Day 1 (<4) and Day 5 (<2) (94.3% and 96.6%, respectively). Conclusions: Overall, the risk scores performed well in our Asian cohort. If applied, 23.5% of the cohort with a VIRSTA ≥ 3 would require TEE, and a score of <3 had an excellent negative predictive value.
Collapse
Affiliation(s)
- Jinghao Nicholas Ngiam
- Division of Infectious Diseases, National University Hospital, National University Health System, 1E Kent Ridge Rd, NUHS Tower Block, Level 10, Singapore 119228, Singapore; (M.C.Y.K.)
| | - Matthew Chung Yi Koh
- Division of Infectious Diseases, National University Hospital, National University Health System, 1E Kent Ridge Rd, NUHS Tower Block, Level 10, Singapore 119228, Singapore; (M.C.Y.K.)
| | - Sophia Archuleta
- Division of Infectious Diseases, National University Hospital, National University Health System, 1E Kent Ridge Rd, NUHS Tower Block, Level 10, Singapore 119228, Singapore; (M.C.Y.K.)
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
| | - Dale Fisher
- Division of Infectious Diseases, National University Hospital, National University Health System, 1E Kent Ridge Rd, NUHS Tower Block, Level 10, Singapore 119228, Singapore; (M.C.Y.K.)
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
| | - Louis Yi-Ann Chai
- Division of Infectious Diseases, National University Hospital, National University Health System, 1E Kent Ridge Rd, NUHS Tower Block, Level 10, Singapore 119228, Singapore; (M.C.Y.K.)
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
| | - Ching-Hui Sia
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
- Department of Cardiology, National University Heart Centre Singapore, National University Health System, 1E Kent Ridge Rd, NUHS Tower Block, Level 9, Singapore 119228, Singapore
| | - William K. F. Kong
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
- Department of Cardiology, National University Heart Centre Singapore, National University Health System, 1E Kent Ridge Rd, NUHS Tower Block, Level 9, Singapore 119228, Singapore
| | - Paul Anantharajah Tambyah
- Division of Infectious Diseases, National University Hospital, National University Health System, 1E Kent Ridge Rd, NUHS Tower Block, Level 10, Singapore 119228, Singapore; (M.C.Y.K.)
- Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
- Infectious Diseases Translational Research Programme, Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
| |
Collapse
|
3
|
Pochepnia S, Grabczak EM, Johnson E, Eyuboglu FO, Akkerman O, Prosch H. Imaging in pulmonary infections of immunocompetent adult patients. Breathe (Sheff) 2024; 20:230186. [PMID: 38595938 PMCID: PMC11003523 DOI: 10.1183/20734735.0186-2023] [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: 11/06/2023] [Accepted: 02/06/2024] [Indexed: 04/11/2024] Open
Abstract
Pneumonia is a clinical syndrome characterised by fever, cough and alveolar infiltration of purulent fluid, caused by infection with a microbial pathogen. It can be caused by infections with bacteria, viruses or fungi, but a causative organism is identified in less than half of cases. The most common type of pneumonia is community-acquired pneumonia, which is caused by infections acquired outside the hospital. Current guidelines for pneumonia diagnosis require imaging to confirm the clinical suspicion of pneumonia. Thus, imaging plays an important role in both the diagnosis and management of pneumonia, with each modality having specific advantages and limitations. Chest radiographs are commonly used but have limitations in terms of sensitivity and specificity. Lung ultrasound shows high sensitivity and specificity. Computed tomography scans offer higher diagnostic accuracy but involve higher radiation doses. Radiological patterns, including lobar, lobular and interstitial pneumonia, provide valuable insights into causative pathogens and treatment decisions. Understanding these radiological patterns is crucial for accurate diagnosis. In this review, we will summarise the most important aspects pertaining to the role of imaging in pneumonia and will highlight the imaging characteristics of the most common causative organisms.
Collapse
Affiliation(s)
- Svitlana Pochepnia
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Elzbieta Magdalena Grabczak
- Department of Internal Medicine, Pulmonary Diseases and Allergy, Medical University of Warsaw, Warsaw, Poland
| | - Emma Johnson
- Clinical and Molecular Medicine, University of Dundee, Dundee, UK
| | - Fusun Oner Eyuboglu
- Baskent University School of Medicine, Pulmonary Diseases Department, Baskeny University Hospital, Ankara, Turkey
| | - Onno Akkerman
- University of Groningen, University Medical Center Groningen, Department of Pulmonary Diseases and Tuberculosis, Groningen, The Netherlands
- University of Groningen, University Medical Center Groningen, TB center Beatrixoord, Groningen, The Netherlands
| | - Helmut Prosch
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria
| |
Collapse
|
4
|
Nakamura T, Ishikawa K, Murata N, Sato K, Kitamura A, Mori N, Jinta T. Empyema necessitans caused by methicillin-resistant Staphylococcus aureus: a case report and literature review. BMC Infect Dis 2024; 24:157. [PMID: 38302885 PMCID: PMC10835956 DOI: 10.1186/s12879-024-09062-0] [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: 11/10/2023] [Accepted: 01/26/2024] [Indexed: 02/03/2024] Open
Abstract
BACKGROUND Empyema necessitans (EN) is a rare condition characterized by pleural infection with pus spreading into adjacent soft tissues. Although Mycobacterium tuberculosis and Actinomyces israelii are common causative agents, methicillin-resistant Staphylococcus aureus (MRSA) is relatively rare, but it is associated with high mortality in empyema cases. We aimed to report a unique case of EN caused by MRSA and present a literature review to better understand this rare condition. CASE PRESENTATION A 69-year-old man with a history of right ureteral stone presented with fever and left anterior thoracic pain. A physical examination revealed redness and swelling in the left thoracic region. Imaging studies confirmed EN with fluid accumulation around the sternocostal joint of the left first rib. MRSA was identified from blood and pleural fluid cultures. The patient received antimicrobial therapy, and a chest tube was inserted for drainage. Despite initial improvement, vertebral osteomyelitis was diagnosed on day 17. The antimicrobials were subsequently terminated after 6 weeks, but vertebral osteomyelitis recurred, and treatment was resumed and completed on day 215. CONCLUSION EN caused by MRSA is rare, and the literature review revealed 14 cases from human sources. Positive blood cultures were observed in 40% of cases, and metastatic infections were present in 30% of cases. Osteomyelitis was the most common type of metastatic lesion. All the patients underwent drainage. Patients with MRSA-associated EN frequently develop disseminated lesions and should therefore be carefully examined. Moreover, appropriate treatment with antibiotics and drainage is necessary for a good prognosis. Although the prognosis appeared to be favorable in our review, publication bias and treatment challenges for metastatic infections should be considered.
Collapse
Affiliation(s)
- Tomoaki Nakamura
- Department of Pulmonary Medicine, Thoracic Center, St. Luke's International Hospital, Tokyo, Japan.
| | - Kazuhiro Ishikawa
- Department of Infectious Diseases, St. Luke's International Hospital, Tokyo, Japan
| | - Naoki Murata
- Department of Pulmonary Medicine, Thoracic Center, St. Luke's International Hospital, Tokyo, Japan
| | - Kuniko Sato
- St. Luke's International University Library, Tokyo, Japan
| | - Atsushi Kitamura
- Department of Pulmonary Medicine, Thoracic Center, St. Luke's International Hospital, Tokyo, Japan
| | - Nobuyoshi Mori
- Department of Infectious Diseases, St. Luke's International Hospital, Tokyo, Japan
| | - Torahiko Jinta
- Department of Pulmonary Medicine, Thoracic Center, St. Luke's International Hospital, Tokyo, Japan
| |
Collapse
|
5
|
Bavaro DF, Belati A, Bussini L, Cento V, Diella L, Gatti M, Saracino A, Pea F, Viale P, Bartoletti M. Safety and effectiveness of fifth generation cephalosporins for the treatment of methicillin-resistant staphylococcus aureus bloodstream infections: a narrative review exploring past, present, and future. Expert Opin Drug Saf 2024; 23:9-36. [PMID: 38145925 DOI: 10.1080/14740338.2023.2299377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 12/21/2023] [Indexed: 12/27/2023]
Abstract
INTRODUCTION Methicillin-resistant Staphylococcus aureus (MRSA) bloodstream infection (BSI) is a major issue in healthcare, since it is often associated with endocarditis or deep site foci. Relevant morbidity and mortality associated with MRSA-BSIs forced the development of new antibiotic strategies; in particular, this review will focus the attention on fifth-generation cephalosporins (ceftaroline/ceftobiprole), that are the only ß-lactams active against MRSA. AREAS COVERED The review discusses the available randomized controlled trials and real-world observational studies conducted on safety and effectiveness of ceftaroline/ceftobiprole for the treatment of MRSA-BSIs. Finally, a proposal of MRSA-BSI treatment flowchart, based on fifth-generation cephalosporins, is described. EXPERT OPINION The use of anti-MRSA cephalosporins is an acceptable choice either in monotherapy or combination therapy for the treatment of MRSA-BSIs due to their relevant effectiveness and safety. Particularly, their use may be advisable in combination therapy in case of severe infections (including endocarditis or persistent bacteriemia) or in monotherapy in subjects at higher risk of drugs-induced toxicity with older regimens. On the contrary, caution should be taken in case of suspected/ascertained central nervous system infections due to inconsistent data regarding penetration of these drugs in cerebrospinal fluid and brain tissues.
Collapse
Affiliation(s)
- Davide Fiore Bavaro
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
- Infectious Disease Unit, IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy
| | - Alessandra Belati
- Department of Biomedical Sciences and Human Oncology, Clinic of Infectious Diseases, University of Bari "Aldo Moro", Bari, Italy
| | - Linda Bussini
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
- Infectious Disease Unit, IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy
| | - Valeria Cento
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
- Microbiology, IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy
| | - Lucia Diella
- Department of Biomedical Sciences and Human Oncology, Clinic of Infectious Diseases, University of Bari "Aldo Moro", Bari, Italy
| | - Milo Gatti
- Department of Medical and Surgical Sciences, Alma Mater Studiorum, University of Bologna, Bologna, Italy
- Clinical Pharmacology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Annalisa Saracino
- Department of Biomedical Sciences and Human Oncology, Clinic of Infectious Diseases, University of Bari "Aldo Moro", Bari, Italy
| | - Federico Pea
- Department of Medical and Surgical Sciences, Alma Mater Studiorum, University of Bologna, Bologna, Italy
- Clinical Pharmacology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Pierluigi Viale
- Clinical Pharmacology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
- Infectious Disease Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Michele Bartoletti
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
- Infectious Disease Unit, IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy
| |
Collapse
|
6
|
Bouza E, Guillen-Zabala H, Rojas A, Cañada G, Cercenado E, Sánchez-Carrillo C, Díez C, Puente L, Muñoz P, Galar A. Comparative study of the etiology of nosocomial bacteremic pneumonia in ventilated and non-ventilated patients: a 10-year experience in an institution. Microbiol Spectr 2023; 11:e0151723. [PMID: 37698391 PMCID: PMC10715084 DOI: 10.1128/spectrum.01517-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 07/13/2023] [Indexed: 09/13/2023] Open
Abstract
IMPORTANCE This study on bacteremic nosocomial pneumonia (bNP) demonstrates the importance of this condition both in patients undergoing and not undergoing mechanical ventilation. Staphylococcus aureus, Enterobacterales, and non-fermenting Gram-negative bacilli are all causative agents in ventilator-associated pneumonia (VAP) and hospital-acquired pneumonia (HAP), with a predominance of S. aureus in HAP and of Pseudomonas aeruginosa in VAP. Mortality in this condition is very high. Therefore, new therapeutic and preventive approaches should be sought.
Collapse
Affiliation(s)
- Emilio Bouza
- Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
- CIBERES (CB06/06/0058), CIBER Enfermedades Respiratorias, Madrid, Spain
- Department of Medicine, School of Medicine, Universidad Complutense de Madrid, Madrid, Spain
| | - Helmuth Guillen-Zabala
- Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
| | - Adriana Rojas
- Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
| | - Gabriela Cañada
- Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
| | - Emilia Cercenado
- Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
- CIBERES (CB06/06/0058), CIBER Enfermedades Respiratorias, Madrid, Spain
- Department of Medicine, School of Medicine, Universidad Complutense de Madrid, Madrid, Spain
| | - Carlos Sánchez-Carrillo
- Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
| | - Cristina Díez
- Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
| | - Luis Puente
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
- Department of Medicine, School of Medicine, Universidad Complutense de Madrid, Madrid, Spain
- Department of Pneumology, Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | - Patricia Muñoz
- Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
- CIBERES (CB06/06/0058), CIBER Enfermedades Respiratorias, Madrid, Spain
- Department of Medicine, School of Medicine, Universidad Complutense de Madrid, Madrid, Spain
| | - Alicia Galar
- Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Madrid, Spain
- Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
| |
Collapse
|
7
|
Hackemann VCJ, Hagel S, Jandt KD, Rödel J, Löffler B, Tuchscherr L. The Controversial Effect of Antibiotics on Methicillin-Sensitive S. aureus: A Comparative In Vitro Study. Int J Mol Sci 2023; 24:16308. [PMID: 38003500 PMCID: PMC10671744 DOI: 10.3390/ijms242216308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 11/06/2023] [Accepted: 11/09/2023] [Indexed: 11/26/2023] Open
Abstract
Methicillin-sensitive Staphylococcus (S.) aureus (MSSA) bacteremia remains a global challenge, despite the availability of antibiotics. Primary treatments include β-lactam agents such as cefazolin and flucloxacillin. Ongoing discussions have focused on the potential synergistic effects of combining these agents with rifampicin or fosfomycin to combat infections associated with biofilm formation. Managing staphylococcal infections is challenging due to antibacterial resistance, biofilms, and S. aureus's ability to invade and replicate within host cells. Intracellular invasion shields the bacteria from antibacterial agents and the immune system, often leading to incomplete bacterial clearance and chronic infections. Additionally, S. aureus can assume a dormant phenotype, known as the small colony variant (SCV), further complicating eradication and promoting persistence. This study investigated the impact of antibiotic combinations on the persistence of S. aureus 6850 and its stable small colony variant (SCV strain JB1) focusing on intracellular survival and biofilm formation. The results from the wild-type strain 6850 demonstrate that β-lactams combined with RIF effectively eliminated biofilms and intracellular bacteria but tend to select for SCVs in planktonic culture and host cells. Higher antibiotic concentrations were associated with an increase in the zeta potential of S. aureus, suggesting reduced membrane permeability to antimicrobials. When using the stable SCV mutant strain JB1, antibiotic combinations with rifampicin successfully cleared planktonic bacteria and biofilms but failed to eradicate intracellular bacteria. Given these findings, it is reasonable to report that β-lactams combined with rifampicin represent the optimal treatment for MSSA bacteremia. However, caution is warranted when employing this treatment over an extended period, as it may elevate the risk of selecting for small colony variants (SCVs) and, consequently, promoting bacterial persistence.
Collapse
Affiliation(s)
| | - Stefan Hagel
- Institute of Infectious Diseases and Infection Control, Jena University Hospital, 07747 Jena, Germany
| | - Klaus D Jandt
- Otto Schott Institute of Materials Research (OSIM), Friedrich Schiller University Jena, 07743 Jena, Germany
- Jena School for Microbial Communication (JSMC), 07743 Jena, Germany
| | - Jürgen Rödel
- Institute for Medical Microbiology, Jena University Hospital, 07747 Jena, Germany
| | - Bettina Löffler
- Institute for Medical Microbiology, Jena University Hospital, 07747 Jena, Germany
| | - Lorena Tuchscherr
- Institute for Medical Microbiology, Jena University Hospital, 07747 Jena, Germany
| |
Collapse
|
8
|
Stephens AC, Banerjee SK, Richardson AR. Specialized phosphate transport is essential for Staphylococcus aureus nitric oxide resistance. mBio 2023; 14:e0245123. [PMID: 37937971 PMCID: PMC10746193 DOI: 10.1128/mbio.02451-23] [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: 09/13/2023] [Accepted: 10/03/2023] [Indexed: 11/09/2023] Open
Abstract
Staphylococcus aureus is a major human pathogen capable of causing a variety of diseases ranging from skin and soft tissue infections to systemic presentations such as sepsis, endocarditis, and osteomyelitis. For S. aureus to persist as a pathogen in these environments, it must be able to resist the host immune response, including the production of reactive oxygen and nitrogen species (e.g., nitric oxide, NO·). Extensive work from our lab has shown that S. aureus is highly resistant to NO·, especially in the presence of glucose. RNA-seq performed on S. aureus exposed to NO· in the presence and absence of glucose showed a new system important for NO· resistance-phosphate transport. The phosphate transport systems pstSCAB and nptA are both upregulated upon NO·-exposure, particularly in the presence of glucose. Both are key for phosphate transport at an alkaline pH, which the cytosol of S. aureus becomes under NO· stress. Accordingly, the ΔpstSΔnptA mutant is attenuated under NO stress in vitro as well as in macrophage and murine infection models. This work defines a new role in infection for two phosphate transporters in S. aureus and provides insight into the complex system that is NO· resistance in S. aureus.IMPORTANCEStaphylococcus aureus is a bacterial pathogen capable of causing a wide variety of disease in humans. S. aureus is unique in its ability to resist the host immune response, including the antibacterial compound known as nitric oxide (NO·). We used an RNA-sequencing approach to better understand the impact of NO· on S. aureus in different environments. We discovered that inorganic phosphate transport is induced by the presence of NO·. Phosphate is important for the generation of energy from glucose, a carbon source favored by S. aureus. We show that the absence of these phosphate transporters causes lowered energy levels in S. aureus. We find that these phosphate transporters are essential for S. aureus to grow in the presence of NO· and to cause infection. Our work here contributes significantly to our understanding of S. aureus NO· resistance and provides a new context in which S. aureus phosphate transporters are essential.
Collapse
Affiliation(s)
- Amelia C. Stephens
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Srijon K. Banerjee
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Anthony R. Richardson
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| |
Collapse
|
9
|
Bonin E, Avila VD, Carvalho VM, Cardoso MAP, Matos AM, Ramos AVG, Cabral MRP, Baldoqui DC, Sarragiotto MH, Filho BADA, Prado IND. Study of chemical constituents, antioxidants and antimicrobial activities of Tamarindus indica L. seed. J Food Sci 2023; 88:4639-4652. [PMID: 37755709 DOI: 10.1111/1750-3841.16739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 07/20/2023] [Accepted: 07/27/2023] [Indexed: 09/28/2023]
Abstract
The fruits of Tamarindus indica L. are consumed worldwide, with various parts of the plant being used for medicinal purposes. The residues (pericarp and seeds) generated during cellulose processing are of significant value as they contain bioactive compounds with diverse biological activities. The objective of this study was to evaluate the chemical constituents of the ethyl acetate fraction as possible substitutes for synthetic compounds with biological properties using ultra-high performance liquid chromatography coupled to high-resolution mass spectrometry (UHPLC-HRMS/MS) analysis and the evaluation of the antioxidant activity (ferric reducing antioxidant power [FRAP], 2,2'-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid [ABTS], and 1-diphenyl-2-picrylhydrazyl [DPPH]), total phenolic compounds (TPC), and antimicrobial activity of the hydroalcoholic extract and tamarind seed fractions were also performed. The chemical investigation of the acetate fraction using UHPLC-HRMS/MS resulted in the putative identification of 14 compounds, including flavonoids, (+)-catechin/(-)-epicatechin, procyanidin B2, procyanidin C2, isoquercetin, quercetin, luteolin, rutin, taxifolin, eriodictyol, kaempferide, hydroxybenzoic acid, protocathecuic acid, and protocathecuic acid methyl and ethyl esters derivatives. The crude hydroalcoholic extract exhibited the best results in terms of TPC: 883.87 gallic acid equivalent (GAE; mg/g) and antioxidant activity: FRAP: 183.29 GAE (mg/g), ABTS: 39.67%, and DPPH: 91.08%. The extract exhibited excellent antibacterial activity against gram-positive bacteria, specifically Staphylococcus aureus minimum inhibitory concentration (MIC)/minimum bactericidal concentration (MBC; 62.5/125 g/mL) and Bacillus cereus MIC/MBC (125/250 g/mL), and gram-negative bacteria, specifically Aeromonas hydrophila MIC/MBC (125/250 µg/mL) and Pseudomonas aeruginosa MIC/MBC (250/500 g/mL). Morphological damage to cells was observed using flow cytometry and scanning electron microscopy. Tamarind seeds contain unique bioactive compounds that should be explored for their use as novel food preservatives. PRACTICAL APPLICATION: Original data were obtained regarding the Tamarindus indica L. seed extract and the ethyl acetate and hexane fractions. This research aimed to investigate the potential of these for food preservation and as alternatives to additives and synthetic compounds added to cattle feed. This paper reports novel findings regarding the chemical composition of the extract and its antioxidant activity, along with its antimicrobial activity against bacteria (gram-positive: Staphylococcus aureus, Bacillus cereus, and gram-negative: Salmonella enterica serovar Enteritidis, Escherichia coli, Pseudomonas aeruginosa, and Aeromonas hydrophila) and yeasts (Candida albicans and Saccharomyces cerevisiae).
Collapse
Affiliation(s)
- Edinéia Bonin
- Post Graduate Program in Food Science, State University of Maringá, Maringá, Paraná, Brazil
| | - Vicente Diaz Avila
- Department of Veterinary Medicine, Remington University Corporation, Ibagué, Tolima, Colombia
| | | | | | - Aylle Medeiros Matos
- Post Graduate in Animal Science, State University of Maringá, Maringá, Paraná, Brazil
| | | | | | | | | | | | | |
Collapse
|
10
|
Sabt A, Abdelraof M, Hamissa MF, Noamaan MA. Antibacterial Activity of Quinoline-Based Derivatives against Methicillin-Resistant Staphylococcus aureus and Pseudomonas aeruginosa: Design, Synthesis, DFT and Molecular Dynamic Simulations. Chem Biodivers 2023; 20:e202300804. [PMID: 37933986 DOI: 10.1002/cbdv.202300804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 10/05/2023] [Indexed: 11/08/2023]
Abstract
Bacterial virulence becomes a significant challenge for clinical treatments, particularly those characterized as Multi-Drug-Resistant (MDR) strains. Therefore, the preparation of new compounds with active moieties could be a successful approach for eradication of MDR strains. For this purpose, newly synthesized quinoline compounds were prepared and tested for their antimicrobial activity against Methicillin-Resistant Staphylococcus Aureus (MRSA) and Pseudomonas Aeruginosa (PA). Among the synthesized derivatives, compounds 1-(quinolin-2-ylamino)pyrrolidine-2,5-dione (8) and 2-(2-((5-methylfuran-2-yl)methylene)hydrazinyl)quinoline (12) were shown to possess the highest antimicrobial activity with the minimum inhibitory concentration with the values of 5±2.2 and10±1.5 μg/mL towards Pseudomonas aeruginosa without any activity towards MRSA. Interestingly, compounds 2-(2-((1H-indol-3-yl)methylene)hydrazinyl)quinoline (13) and 2-(4-bromophenyl)-3-(quinolin-2-ylamino)thiazolidin-4-one (16c) showed significant inhibition activity against Staphylococcus aureus MRSA and Pseudomonas aeruginosa. Compound 13 (with indole moiety) particularly displayed excellent bactericidal activity with low MIC values 20±3.3 and 10±1.5 μg/mL against Staphylococcus aureus MRSA and Pseudomonas aeruginosa, respectively. Effects molecular modelling was used to determine the mode of action for the antimicrobial effect. The stability of complexes formed by docking and target-ligand pairing was evaluated using molecular dynamics simulations. The compounds were also tested for binding affinity to the target protein using MM-PBSA. Density-functional theory (DFT) calculations were also used to investigate the electrochemical properties of various compounds.
Collapse
Affiliation(s)
- Ahmed Sabt
- Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Institute, National Research Center, Dokki, Cairo, 12622, Egypt
| | - Mohamed Abdelraof
- Microbial Chemistry Department, Biotechnology Research Institute, National Research Center (NRC), 33 El Behouth St., Giza P.O., 12622, Egypt
| | - Mohamed Farouk Hamissa
- Department of Biomolecular Spectroscopy, Institute of Organic Chemistry and Biochemistry, Academy of Sciences, Prague, Czech Republic
| | - Mahmoud A Noamaan
- Mathematics Department, Faculty of Science, Cairo University, Giza, 12613, Egypt
| |
Collapse
|
11
|
Kawasuji H, Ikezawa Y, Morita M, Sugie K, Somekawa M, Ezaki M, Koshiyama Y, Takegoshi Y, Murai Y, Kaneda M, Kimoto K, Nagaoka K, Niimi H, Morinaga Y, Yamamoto Y. High Incidence of Metastatic Infections in Panton-Valentine Leucocidin-Negative, Community-Acquired Methicillin-Resistant Staphylococcus aureus Bacteremia: An 11-Year Retrospective Study in Japan. Antibiotics (Basel) 2023; 12:1516. [PMID: 37887217 PMCID: PMC10604685 DOI: 10.3390/antibiotics12101516] [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: 08/28/2023] [Revised: 10/04/2023] [Accepted: 10/05/2023] [Indexed: 10/28/2023] Open
Abstract
Panton-Valentine leucocidin (PVL)-negative community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) was originally disseminated in Japan and has since replaced healthcare-associated MRSA (HA-MRSA). However, the clinical characteristics of CA-MRSA bacteremia (CA-MRSAB) compared with those of HA-MRSA bacteremia (HA-MRSAB) are unknown. We aim to clarify differences and investigate associations between the clinical manifestations and virulence genes associated with plasma-biofilm formation in PVL-negative CA-MRSA. From 2011 to 2021, when CA-MRSA dramatically replaced HA-MRSA, 79 MRSA strains were collected from blood cultures and analyzed via SCCmec typing and targeted virulence gene (lukSF-PV, cna, and fnbB) detection. The incidence of metastatic infection was significantly higher in CA-MRSAB than in HA-MRSAB. PVL genes were all negative, although cna and fnbB were positive in 55.6% (20/36) and 50% (18/36) of CA-MRSA strains and 3.7% (1/27) and 7.4% (2/27) of HA-MRSA strains, respectively. cna and fnbB carriage were not associated with the development of metastatic infections in MRSAB; however, the bacteremia duration was significantly longer in CA-MRSAB harboring cna. CA-MRSAB may be more likely to cause metastatic infections than HA-MRSAB. Since CA-MRSA is dominant in Japan, suspected metastatic infection foci should be identified by computed tomography, magnetic resonance imaging, and echocardiography when treating MRSAB.
Collapse
Affiliation(s)
- Hitoshi Kawasuji
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Yoshihiro Ikezawa
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Mika Morita
- Department of Clinical Laboratory and Molecular Pathology, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Kazushige Sugie
- Department of Clinical Laboratory and Molecular Pathology, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Mayu Somekawa
- Department of Microbiology, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Masayoshi Ezaki
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Yuki Koshiyama
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Yusuke Takegoshi
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Yushi Murai
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Makito Kaneda
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Kou Kimoto
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Kentaro Nagaoka
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Hideki Niimi
- Department of Clinical Laboratory and Molecular Pathology, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Yoshitomo Morinaga
- Department of Microbiology, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| | - Yoshihiro Yamamoto
- Department of Clinical Infectious Diseases, Toyama University Graduate School of Medicine and Pharmaceutical Sciences, Toyama 930-0194, Japan
| |
Collapse
|
12
|
Dziubak D, Sęk S. Sparsely tethered bilayer lipid membranes formed by self-assembly of bicelles: Spectroelectrochemical characterization and incorporation of transmembrane protein. Bioelectrochemistry 2023; 153:108482. [PMID: 37271008 DOI: 10.1016/j.bioelechem.2023.108482] [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: 03/28/2023] [Revised: 05/17/2023] [Accepted: 05/26/2023] [Indexed: 06/06/2023]
Abstract
Many biochemical processes related to proper homeostasis take place in cell membranes. The key molecules involved in these processes are proteins, including transmembrane proteins. These macromolecules still challenge the understanding of their function within the membrane. Biomimetic models that mimic the properties of the cell membrane can help understand their functionality. Unfortunately, preserving the native protein structure in such systems is problematic. A possible solution to this problem involves the use of bicelles. Their unique properties make integrating bicelles with transmembrane proteins manageable while preserving their native structure. Hitherto, bicelles have not been used as precursors for protein-hosting lipid membranes deposited on solid substrates like pre-modified gold. Here, we demonstrated that bicelles can be self-assembled to form sparsely tethered bilayer lipid membranes and the properties of the resulting membrane satisfy the conditions suitable for transmembrane protein insertion. We showed that the incorporation of α-hemolysin toxin in the lipid membrane leads to a decrease in membrane resistance due to pore formation. Simultaneously, the insertion of the protein causes a drop in the capacitance of the membrane-modified electrode, which can be explained by the dehydration of the polar region of the lipid bilayer and the loss of water from the submembrane region.
Collapse
Affiliation(s)
- Damian Dziubak
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland.
| | - Sławomir Sęk
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland.
| |
Collapse
|
13
|
Chesdachai S, DeSimone DC, Baddour LM. Risk of Cardiac Implantable Electronic Device Infection in Patients with Bloodstream Infection: Microbiologic Effect in the Era of Positron Emission Tomography-Computed Tomography. Curr Cardiol Rep 2023; 25:781-793. [PMID: 37351825 DOI: 10.1007/s11886-023-01900-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/01/2023] [Indexed: 06/24/2023]
Abstract
PURPOSE OF REVIEW Bloodstream infection (BSI) in patients with cardiac implantable electronic devices (CIEDs) is common and can prompt challenges in defining optimal management. We provide a contemporary narrative review of this topic and propose a pathogen-dependent clinical approach to patient management. RECENT FINDINGS BSI due to staphylococci, viridans group streptococci, and enterococci is associated with an increased risk of underlying CIED infection, while the risk of CIED infection due to other organisms is poorly defined. There is growing evidence that positron emission tomography-computed tomography may be helpful in some patients with BSI and underlying CIED. Twenty studies were included to examine the impact of microbiologic findings on the risk of CIED infection among patients with BSI. Diagnosis of CIED infection in patients with BSI without pocket findings is often difficult, necessitating the use of novel diagnostic tools to help guide the clinician in subsequent patient management.
Collapse
Affiliation(s)
- Supavit Chesdachai
- Division of Public Health, Infectious Diseases and Occupational Medicine, Department of Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.
| | - Daniel C DeSimone
- Division of Public Health, Infectious Diseases and Occupational Medicine, Department of Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
- Department of Cardiovascular Disease, Mayo Clinic, Rochester, MN, USA
| | - Larry M Baddour
- Division of Public Health, Infectious Diseases and Occupational Medicine, Department of Medicine, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
- Department of Cardiovascular Disease, Mayo Clinic, Rochester, MN, USA
| |
Collapse
|
14
|
Liang J, Zou G, Gu C, Tao S, Guo L, Tang C, Zhang J, Deng Z, Chen Y. Study on skin infection model of Staphylococcus aureus based on analytic hierarchy process and Delphi method. Heliyon 2023; 9:e16327. [PMID: 37287617 PMCID: PMC10241873 DOI: 10.1016/j.heliyon.2023.e16327] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 05/10/2023] [Accepted: 05/12/2023] [Indexed: 06/09/2023] Open
Abstract
Purpose Infectious skin diseases are a type of inflammatory skin lesions caused by pathogenic microorganisms. Because of the uncertainty of methodology, the skin infection model usually have low replication rate and lack of good evaluation system. We aimed to establish multi-index and comprehensive evaluation method for Staphylococcus aureus (S.aureus) skin-infection models through Analytic hierarchy process (AHP) and Delphi method, and screen high quality animal models through it. Materials and methods Firstly, the evaluation indicators of skin infection were collected basing on literature research. The weight of the evaluation indicators were decided according to AHP and Delphi method. Then different ulcer models (mouse or rat) infected by S. aureus were selected as the research objects. Results The evaluation indicators were classified into four groups of criteria (including ten sub-indicators) and given different weights, physical sign changes (0.0518), skin lesion appearance (0.2934), morphological observation (0.3184), etiological examination (0.3364). Through the evaluation system, we screened and found that the mouse ulcer model which caused by a round wound and 1.0 × 1010 CFU/mL (0.1 mL) bacterial concentration got the highest comprehensive score, and also found that the model which caused by a 1.5 cm-round wound and 1.0 × 1010 CFU/mL (0.2 mL) maybe the best rat ulcer model. Conclusions This study has established an evaluation system based on AHP and Delphi method, also provided the best skin ulcer models selected by this system, the models are suitable for disease research and drug development research of skin ulcer.
Collapse
Affiliation(s)
- Jiaxin Liang
- Guangdong Pharmaceutical University, Guangzhou, PR China
| | - Guofa Zou
- Guangdong Pharmaceutical University, Guangzhou, PR China
| | - Chiming Gu
- The Second Clinical Medical College of Guangzhou University of Chinese Medicine; Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, PR China
| | - Shuhong Tao
- Guangdong Pharmaceutical University, Guangzhou, PR China
| | - Libing Guo
- Guangdong Pharmaceutical University, Guangzhou, PR China
| | - Chunping Tang
- Guangdong Pharmaceutical University, Guangzhou, PR China
| | - Jinhong Zhang
- Guangdong Pharmaceutical University, Guangzhou, PR China
| | - Zujun Deng
- Guangdong Pharmaceutical University, Guangzhou, PR China
| | - Yanfen Chen
- Guangdong Pharmaceutical University, Guangzhou, PR China
- Guangzhou Key Laboratory of Construction and Application of New Drug Screening Model Systems, Guangzhou, PR China
| |
Collapse
|
15
|
Yi Y, Yang S, Liu Y, Yin B, Zhao Z, Li G, Huang Z, Chen L, Liu F, Shang R, Lin S. Antibiotic resistance and drug modification: Synthesis, characterization and bioactivity of newly modified potent pleuromutilin derivatives with a substituted piperazine moiety. Bioorg Chem 2023; 132:106353. [PMID: 36669358 DOI: 10.1016/j.bioorg.2023.106353] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/27/2022] [Accepted: 01/08/2023] [Indexed: 01/13/2023]
Abstract
Antibiotic-resistant bacteria pose a major global public health concern, owing to the lack of effective antibacterial drugs. Consequently, the discovery and development of innovative antibacterial drug classes with unique mechanisms of action are urgently needed. In this study, we designed, synthesised, and tested a series of novel pleuromutilin derivatives with piperazine linker substituted by amino acids moieties to determine their antibacterial properties. Most synthesized compounds exhibited potent activities against Staphylococcus aureus (S. aureus), methicillin-resistant S. aureus (MRSA), and methicillin-resistant Staphylococcus epidermidis. Compound 6l, the most potent antibacterial agent created in this study, displayed a rapid bactericidal activity against MRSA, Klebsiella pneumoniae and S. aureus cfr N12. Moreover, pharmacokinetics study of compound 6l exhibited good PK performance with a low in vivo clearance (CL = 1965 mL/h/kg) and a suitable half-life (T1/2 = 11.614 ± 5.123 h). Molecular docking experiments revealed the binding model of compound 6l to the unmethylated A2503 of peptidyl transferase centre of 23S rRNA. Interaction pattern of 6l with cfr-mediated ribosomes revealed by molecular dynamics. Moreover in vivo mouse systemic infection experiments with compound 6l revealed its effectiveness against MRSA and S. aureus cfr N12 with the ED50 of 11.08 mg/kg and 14.63 mg/kg body weight, respectively.
Collapse
Affiliation(s)
- Yunpeng Yi
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan 250023, Shandong, China
| | - Shifa Yang
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan 250023, Shandong, China
| | - Yueyue Liu
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan 250023, Shandong, China
| | - Bin Yin
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan 250023, Shandong, China
| | - Zengcheng Zhao
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan 250023, Shandong, China
| | - Guiming Li
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan 250023, Shandong, China
| | - Zhongli Huang
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan 250023, Shandong, China
| | - Lei Chen
- Shandong Provincial Key Laboratory of Animal Resistance Biology, College of Life Sciences, Shandong Normal University, Jinan 250014, Shandong, China
| | - Fei Liu
- Shandong Key Laboratory of Animal Disease Control and Breeding, Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan 250023, Shandong, China
| | - Ruofeng Shang
- Key Laboratory of New Animal Drug Project, Gansu Province/Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture and Rural Affairs/Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou 730050, China.
| | - Shuqian Lin
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan 250023, Shandong, China.
| |
Collapse
|
16
|
Kitaya S, Kanamori H, Katori Y, Tokuda K. Clinical Characteristics and Outcomes of Persistent Staphylococcal Bacteremia in a Tertiary Care Hospital. Antibiotics (Basel) 2023; 12:antibiotics12030454. [PMID: 36978326 PMCID: PMC10044455 DOI: 10.3390/antibiotics12030454] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 02/15/2023] [Accepted: 02/22/2023] [Indexed: 03/03/2023] Open
Abstract
Clinical outcomes of persistent staphylococcal bacteremia vary depending on the causative organism. This secondary data analysis study compared the clinical characteristics of persistent Staphylococcus aureus (S. aureus)- and coagulase-negative staphylococci (CoNS)-caused bacteremia, focusing on the methicillin-resistant status. This study used data collected from patients who underwent blood cultures between January 2012 and December 2021 at Tohoku University Hospital, Japan. Patients with persistent staphylococcal bacteremia were divided into groups based on the pathogen and methicillin-resistant status, and their characteristics were analyzed. The primary outcomes were early (30-day), late (30–90 days), and 90-day mortality rates. The early, late, and 90-day mortality rates were similar between the persistent CoNS and S. aureus bacteremia groups. Patients with persistent methicillin-resistant S. aureus (MRSA) bacteremia tended to have higher early, late, and 90-day mortality rates than those with persistent methicillin-susceptible S. aureus bacteremia (not statistically significant). No differences were observed between the methicillin-resistant and-susceptible CoNS groups. In patients with persistent CoNS bacteremia, mortality tended to increase, especially in debilitated or immunocompromised patients with distant metastases, underscoring the importance of infection source control. Mortality tended to be high in patients with persistent MRSA bacteremia, especially when persistent bacteremia clearance was not confirmed, illustrating the need for careful therapeutic management.
Collapse
Affiliation(s)
- Shiori Kitaya
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan
- Department of Otolaryngology, Head and Neck Surgery, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan
- Correspondence: (S.K.); (H.K.); Tel.: +81-22-717-7373 (S.K.)
| | - Hajime Kanamori
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan
- Correspondence: (S.K.); (H.K.); Tel.: +81-22-717-7373 (S.K.)
| | - Yukio Katori
- Department of Otolaryngology, Head and Neck Surgery, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan
| | - Koichi Tokuda
- Department of Infectious Diseases, Internal Medicine, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan
| |
Collapse
|
17
|
Phage transcription activator RinA regulates Staphylococcus aureus virulence by governing sarA expression. Genes Genomics 2023; 45:191-202. [PMID: 36520268 PMCID: PMC9867676 DOI: 10.1007/s13258-022-01352-8] [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: 05/02/2022] [Accepted: 11/30/2022] [Indexed: 12/23/2022]
Abstract
BACKGROUND Staphylococcus aureus is a major human pathogen, that can lead to various community- and hospital-acquired infections. RinA is a transcription activator of S. aureus phage φ 11 involved in phage packaging and virulence gene transfer. However, little is known about the molecular mechanism of RinA in the regulation of virulence. OBJECTIVE We aimed to explore a novel contribution of RinA in the regulation of virulence and provide a new drug target in the treatment of S. aureus infections. METHODS The specific functions of RinA in S. aureus were analyzed by the methods of growth curve, real-time quantitative PCR (RT-qPCR), subcellular localization, electrophoretic mobility shift assay (EMSA), infection model of Galleria mellonella larvae and the mouse subcutaneous abscess model. RESULTS In this study, we demonstrated that RinA is a protein evenly distributed in the cytoplasm of S. aureus, and its deletion could cause the growth defects. RT-qPCR and EMSA determined that rinA could negatively regulate the expression of sarA by directly binding to its promoter, and vice versa. The Galleria mellonella larvae infection and mouse subcutaneous abscess models revealed that the rinA mutant strain exhibited obvious virulence defects. When sarA is knocked out, the virulence of S.aureus had no significantly changes whether rinA is knocked out or not. CONCLUSION Our fndings demonstrated that phage transcription activator RinA regulates S. aureus virulence by governing sarA expression.
Collapse
|
18
|
Dieperink SS, Mehnert F, Nørgaard M, Oestergaard LB, Benfield T, Petersen A, Torp-Pedersen C, Glintborg B, Hetland ML. Antirheumatic treatment, disease activity and risk of Staphylococcus aureus bacteraemia in rheumatoid arthritis: a nationwide nested case-control study. RMD Open 2022; 8:rmdopen-2022-002636. [PMID: 36517186 PMCID: PMC9756197 DOI: 10.1136/rmdopen-2022-002636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 10/17/2022] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVES To assess how biological disease-modifying antirheumatic drugs (bDMARDs), glucocorticoids and disease activity affect risk of Staphylococcus aureus bacteraemia (SAB) in patients with rheumatoid arthritis (RA). METHODS In a nationwide cohort of patients with RA from the DANBIO registry, we conducted a nested case-control study including first-time microbiologically verified SAB cases from 2010 to 2018 and incidence density matched controls (1:4 by sex, age). We interlinked Danish registries and identified antirheumatic treatments, RA-specific clinical characteristics, comorbidities and socioeconomic status. The relative risk of SAB was assessed by adjusted ORs with 95% CIs and number needed to harm (NNH) reflected the absolute risk. RESULTS Among 30 479 patients, we identified 180 SAB cases (incidence rate: 106.7/100 000 person-years) and matched 720 controls (57% women, median age 73 years, IQR: 65-80). Risk of SAB was increased in current (OR 1.8 (95% CI 1.1 to 3.2)) and former bDMARD users (OR 2.5 (95% CI 0.9 to 7.0)), and in current users of oral glucocorticoids ≤7.5 prednisolone-equivalent mg/day (OR 2.2 (95% CI 1.3 to 4.0) and >7.5 mg/day (OR 9.5 (95% CI 3.9 to 22.7)) (non-use as reference). ORs for moderate/high disease activity compared with remission were 1.6 (95% CI 0.8 to 3.3)/1.5 (95% CI 0.6 to 4.3). Risk was increased in patients with longstanding RA (>10 years vs ≤3 years, OR=2.4 (95% CI 1.1 to 5.3)). The NNH was 1172(95% CI 426 to 9374) for current use of bDMARDs and 110(95% CI 43 to 323) for glucocorticoids >7.5 mg/day. CONCLUSION We identified a dose-dependent increased risk of SAB in patients with RA currently using oral glucocorticoids. Daily use of >7.5 mg appeared to be a clinically relevant risk factor, whereas the absolute risk was low for bDMARDs. No clear impact of disease activity was found.
Collapse
Affiliation(s)
- Sabine Sparre Dieperink
- Copenhagen Center for Arthritis Research (COPECARE), Centre for Rheumatology and Spine Diseases, Centre of Head and Orthopaedics, Copenhagen University Hospital - Rigshospitalet, Glostrup, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Frank Mehnert
- Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
| | - Mette Nørgaard
- Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
| | - Louise Bruun Oestergaard
- Cardiovascular Research Center, Copenhagen University Hospital - Herlev and Gentofte, Hellerup, Denmark
| | - Thomas Benfield
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Department of Infectious Diseases, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark
| | - Andreas Petersen
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Christian Torp-Pedersen
- Department of Cardiology, Copenhagen University Hospital - North Zealand, Hillerød, Denmark
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Bente Glintborg
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Copenhagen Center for Arthritis Research (COPECARE) and the DANBIO Registry, Centre for Rheumatology and Spine Diseases, Centre of Head and Orthopedics, Copenhagen University Hospital - Rigshospitalet, Glostrup, Denmark
| | - Merete Lund Hetland
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- Copenhagen Center for Arthritis Research (COPECARE) and the DANBIO Registry, Centre for Rheumatology and Spine Diseases, Centre of Head and Orthopedics, Copenhagen University Hospital - Rigshospitalet, Glostrup, Denmark
| |
Collapse
|
19
|
Rodriguez-Quick VA, Llop A, Dimas K, Girgawy EA. MRSA in the bursa: an unusual complication of MRSA bacteremia causing bilateral acromioclavicular septic arthritis. Access Microbiol 2022; 4:acmi000438. [PMID: 36644736 PMCID: PMC9836058 DOI: 10.1099/acmi.0.000438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 10/17/2022] [Indexed: 12/12/2022] Open
Abstract
Background. Bacteraemia is known to cause serious complications including metastatic infections such as infective endocarditis, vertebral osteomyelitis, iliopsosas abscesses and septic arthritis. Bilateral septic arthritis, however, is a rare medical emergency with limited previous reports. Staphylococcus species are the most common organisms identified as a result of suspected haematogenous spread from bacteraemia, direct inoculation or translocation from adjacent tissues. While unilateral septic arthritis due to intravenous drug use is a common phenomenon warranting prompt treatment to preserve mobility, function and quality of life, cases of bilateral infections are exceedingly rare. Furthermore, infections involving the acromioclavicular joint are not commonly documented in the literature. Case Presentation. We present a case of a 41-year-old female with a history of intravenous drug use who presented with low back pain and was found to have methicillin-resistant Staphylococcus aureus bacteraemia that was complicated with metastatic infections causing bilateral acromioclavicular joint septic arthritis. Conclusions. Metastatic infections from bacteraemia are serious complications that can lead to septic arthritis. Though septic arthritis is best known in previous case reports to present as a unilateral infection, rare cases of bilateral involvement warrant further consideration. A thorough history and physical examination evaluating all joints can identify such atypical presentations. Septic arthritis remains a medical emergency, and it is imperative that clinicians recognize unusual presentations to avoid delays in treatment that can lead to detrimental impacts to quality of life.
Collapse
Affiliation(s)
- Victoria A. Rodriguez-Quick
- HCA Houston Healthcare Kingwood 22999, US-59 N Kingwood, TX 77339, USA,University of Houston College of Medicine, 4349 Martin Luther King Blvd, Houston, TX 77004, USA,*Correspondence: Victoria A. Rodriguez-Quick,
| | - Alexander Llop
- HCA Houston Healthcare Kingwood 22999, US-59 N Kingwood, TX 77339, USA,University of Houston College of Medicine, 4349 Martin Luther King Blvd, Houston, TX 77004, USA
| | - Kevin Dimas
- HCA Houston Healthcare Kingwood 22999, US-59 N Kingwood, TX 77339, USA,University of Houston College of Medicine, 4349 Martin Luther King Blvd, Houston, TX 77004, USA
| | - Essam A. Girgawy
- HCA Houston Healthcare Kingwood 22999, US-59 N Kingwood, TX 77339, USA,University of Houston College of Medicine, 4349 Martin Luther King Blvd, Houston, TX 77004, USA
| |
Collapse
|
20
|
Potindji TM, Momani OA, Omowumi BB, Baddal B. Screening of Toxin Genes in Methicillin-Resistant Staphylococcus aureus Clinical Isolates from a Hospital Setting in a Tertiary Hospital in Northern Cyprus. Pol J Microbiol 2022; 71:491-497. [PMID: 36368015 PMCID: PMC9944970 DOI: 10.33073/pjm-2022-042] [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: 06/23/2022] [Accepted: 08/29/2022] [Indexed: 11/12/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a significant opportunistic pathogen with a wide repertoire of virulence characteristics. Data regarding the molecular profile of MRSA in Northern Cyprus is limited. The current study aimed to examine the virulence profiles of MRSA with a focus on toxin-associated factors. Ninety-one S. aureus isolates collected at a university hospital were included in the study. Identification and antibiotic susceptibility testing were performed with BD Phoenix™ automated system. Methicillin resistance was evaluated by the disc diffusion assay and mecA detection. The presence of nuc was confirmed by conventional PCR. Confirmed MRSA isolates were assessed for the presence of virulence genes hla, eta, etb, etd and tst using molecular methods. Among 91 S. aureus isolates identified as MRSA using the BD Phoenix™ platform, 80.85% (n = 76/91) were confirmed as MRSA using phenotypic and genotypic methods. All confirmed MRSA isolates (n = 76, 100%) were positive for the nuc. MRSA rates were statistically higher in elderly inpatients. The prevalence of toxin-encoding genes was 97.3% (n = 74/76) for hla, 2.63% (n = 2/76) for eta, 1.3% (n = 1/76) for etb, and 2.63% (n = 2/76) for tst. None of the screened isolates harbored the etd gene. These results represent the first report to investigate multiple virulence factors in MRSA isolates in Northern Cyprus.
Collapse
Affiliation(s)
- Tchamou M.F. Potindji
- Department of Medical Microbiology and Clinical Microbiology, Faculty of Medicine, Near East University, Nicosia, Cyprus
| | - Osaid A.A. Momani
- Department of Medical Microbiology and Clinical Microbiology, Faculty of Medicine, Near East University, Nicosia, Cyprus
| | - Bakare B. Omowumi
- Department of Medical Microbiology and Clinical Microbiology, Faculty of Medicine, Near East University, Nicosia, Cyprus
| | - Buket Baddal
- Department of Medical Microbiology and Clinical Microbiology, Faculty of Medicine, Near East University, Nicosia, Cyprus,Microbial Pathogenesis Research Group, DESAM Institute, Near East University, Nicosia, Cyprus, B. Baddal, Department of Medical Microbiology and Clinical Microbiology, Faculty of Medicine, Near East University, Nicosia, Cyprus; Microbial Pathogenesis Research Group, DESAM Institute, Near East University, Nicosia, Cyprus
| |
Collapse
|
21
|
Zhang H, Qin L, Jin C, Ju H, Jiang R, Li L, Zhang H, Gao W, Wei X, Dong H, Lu F, Lv G. Molecular Characteristics and Antibiotic Resistance of Staphylococcus aureus Isolated from Patient and Food Samples in Shijiazhuang, China. Pathogens 2022; 11:1333. [PMID: 36422585 PMCID: PMC9695393 DOI: 10.3390/pathogens11111333] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 11/07/2022] [Accepted: 11/09/2022] [Indexed: 10/29/2023] Open
Abstract
Staphylococcus aureus (S. aureus) is a common opportunistic and zoonotic pathogen in the world and could easily cause human infections and food contaminations. This study investigated the sequence typing and resistance profiles of S. aureus isolates from patient and food samples in Shijiazhuang, China. A total of 101 S. aureus isolates were distributed into six clonal complexes (CCs) and 16 singletons. A total of 86 patient isolates were distributed into six clonal CCs and 12 singletons, including a new ST. CC59, CC5, CC22, and CC398 were the predominant CCs of patient isolates. A total of 15 foodborne S. aureus isolates were distributed into 3 CCs and 4 STs, and CC1 was the most prevalent CC. Moreover, 101 S. aureus isolates had high resistance to penicillin and low resistance to chloramphenicol and rifampicin. A total of 39 strains of methicillin-resistant Staphylococcus aureus (MRSA) were detected in this study, including thirty-eight strains of patient isolates (44.2%, 38/86) and one strain of food isolates (6.7%, 1/15). MRSA-ST5, MRSA-ST59, and MRSA-ST239 were the predominant MRSA isolates in hospitals. The present study explained the relationship between S. aureus isolated from patient and food samples and indicated the risks of S. aureus in infectious diseases.
Collapse
Affiliation(s)
- Han Zhang
- Basic Medicine College, Hebei University of Chinese Medicine, Shijiazhuang 050200, China
| | - Liyun Qin
- Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang 050011, China
- Hebei Key Laboratory of Unidentifiable Bacteria, Shijiazhuang 050011, China
| | - Caiping Jin
- Basic Medicine College, Hebei University of Chinese Medicine, Shijiazhuang 050200, China
| | - Huidong Ju
- College of Chemical Technology, Shijiazhuang University, Shijiazhuang 050035, China
| | - Ruiping Jiang
- Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang 050011, China
- Hebei Key Laboratory of Unidentifiable Bacteria, Shijiazhuang 050011, China
| | - Lijie Li
- Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang 050011, China
- Hebei Key Laboratory of Unidentifiable Bacteria, Shijiazhuang 050011, China
| | - Hong Zhang
- Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang 050011, China
- Hebei Key Laboratory of Unidentifiable Bacteria, Shijiazhuang 050011, China
| | - Weili Gao
- Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang 050011, China
- Hebei Key Laboratory of Unidentifiable Bacteria, Shijiazhuang 050011, China
| | - Xiuping Wei
- Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang 050011, China
| | - Hongyan Dong
- Basic Medicine College, Hebei University of Chinese Medicine, Shijiazhuang 050200, China
| | - Fei Lu
- Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang 050011, China
- Hebei Key Laboratory of Unidentifiable Bacteria, Shijiazhuang 050011, China
| | - Guoping Lv
- Basic Medicine College, Hebei University of Chinese Medicine, Shijiazhuang 050200, China
| |
Collapse
|
22
|
Mechanisms Behind the Indirect Impact of Metabolic Regulators on Virulence Factor Production in Staphylococcus aureus. Microbiol Spectr 2022; 10:e0206322. [PMID: 35862951 PMCID: PMC9430575 DOI: 10.1128/spectrum.02063-22] [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] [Indexed: 11/25/2022] Open
Abstract
Staphylococcus aureus is a human skin pathogen capable of causing invasive infections in many tissues in the human body. The host of virulence factors, such as toxins and proteases, available to S. aureus contribute to its diverse disease presentations. The majority of these virulence factors are under the control of the Agr quorum sensing system. The interaction between the Agr system and some well-established metabolic regulators has long been noted, but no mechanism has been provided as to these indirect interactions. In this study, we examine the connection between Agr and CcpA, a regulator of central carbon metabolism with a known positive impact on Agr function. We further investigated the interaction of Agr and CodY, a regulator of amino acid metabolism and a member of the stringent response with a known negative impact on Agr function. We show that though there are alterations in intracellular amino acid levels in each of these mutants that are consistent with their effect on Agr, there does not seem to be a direct impact on the translation of the Agr system itself that contributes to the altered expression observed in these mutants. Given the changes in cellular metabolism in a ΔccpA mutant, we find reduced levels of intracellular ATP even in the presence of glucose. This reduction in ATP, combined with the reduced affinity of the AgrC sensor kinase for ATP, explains the reduction in Agr activity long observed in ΔccpA strains. IMPORTANCE The human pathogen Staphylococcus aureus produces a great number of virulence factors that contribute to the pathogen’s ability to cause dangerous, invasive infections. Understanding the full scope of the regulation of these virulence factors can provide us with new information about how to target virulence factor production. For years, researchers in the field have observed an impact of metabolic regulators on virulence factor production with no mechanistic explanation. Here, we describe the role of two of these regulators, CcpA and CodY, in virulence factor expression and provide evidence of indirect mechanisms contributing to the control of the Agr system and virulence factor production by these two metabolic regulators. Our study sheds light on the interplay between metabolism and virulence in S. aureus and provides an explanation as to how these concepts are linked.
Collapse
|
23
|
Laupland KB, Harris PN, Stewart AG, Edwards F, Paterson DL. Culture-based determinants and outcome of Staphylococcus aureus bloodstream infections. Diagn Microbiol Infect Dis 2022; 104:115772. [DOI: 10.1016/j.diagmicrobio.2022.115772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 07/12/2022] [Accepted: 07/17/2022] [Indexed: 11/03/2022]
|
24
|
Le MNT, Kawada-Matsuo M, Komatsuzawa H. Efficiency of Antimicrobial Peptides Against Multidrug-Resistant Staphylococcal Pathogens. Front Microbiol 2022; 13:930629. [PMID: 35756032 PMCID: PMC9218695 DOI: 10.3389/fmicb.2022.930629] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 05/18/2022] [Indexed: 11/13/2022] Open
Abstract
Antibiotics play a vital role in saving millions of lives from fatal infections; however, the inappropriate use of antibiotics has led to the emergence and propagation of drug resistance worldwide. Multidrug-resistant bacteria represent a significant challenge to treating infections due to the limitation of available antibiotics, necessitating the investigation of alternative treatments for combating these superbugs. Under such circumstances, antimicrobial peptides (AMPs), including human-derived AMPs and bacteria-derived AMPs (so-called bacteriocins), are considered potential therapeutic drugs owing to their high efficacy against infectious bacteria and the poor ability of these microorganisms to develop resistance to them. Several staphylococcal species including Staphylococcus aureus, Staphylococcus epidermidis, Staphylococcus haemolyticus, and Staphylococcus saprophyticus are commensal bacteria and known to cause many opportunistic infectious diseases. Methicillin-resistant Staphylococci, especially methicillin-resistant S. aureus (MRSA), are of particular concern among the critical multidrug-resistant infectious Gram-positive pathogens. Within the past decade, studies have reported promising AMPs that are effective against MRSA and other methicillin-resistant Staphylococci. This review discusses the sources and mechanisms of AMPs against staphylococcal species, as well as their potential to become chemotherapies for clinical infections caused by multidrug-resistant staphylococci.
Collapse
Affiliation(s)
- Mi Nguyen-Tra Le
- Department of Bacteriology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Miki Kawada-Matsuo
- Department of Bacteriology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Hitoshi Komatsuzawa
- Department of Bacteriology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| |
Collapse
|
25
|
Singh D, Chauhan N, Koli M, Nayak SK, Subramanian M. Dimer stilbene, a resveratrol analogue exhibits synergy with antibiotics that target protein synthesis in eradicating Staphylococcus aureus infection. Biochimie 2022; 201:128-138. [PMID: 35772578 DOI: 10.1016/j.biochi.2022.06.006] [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: 01/20/2022] [Revised: 06/07/2022] [Accepted: 06/21/2022] [Indexed: 11/16/2022]
Abstract
Antibiotic resistance has become a major hurdle for successful treatment of several infections resulting in increased length of stay in hospitals and mortality. One of the notorious pathogens that wreaks havoc due to antibiotic resistance is Staphylococcus aureus. There is an urgent need to discover and understand the function of newer molecules that could serve in the arsenal to combat these bacteria. Our recent work identified important structural determinants of stilbenes that could aid in better antibacterial activity and identified Dimer stilbene (DS) as a potent inhibitor of S. aureus. Contrasting reports exist in literature about the combination of stilbenes with different antibiotics. In this study we evaluated the ability of DS to synergize with different classes of antibiotics. A screen revealed DS exhibited positive co-operativity with antibiotics that target protein synthesis. DS exhibited synergy with the aminoglycoside kanamycin and additive effect with tetracycline. Resistance generation to DS was null while to that of kanamycin was rapid. Kanamycin resistant S. aureus was equally susceptible to DS compared to wildtype. The efficacy of DS against clinical isolates susceptible and resistant to methicillin were similar. Laboratory generated kanamycin resistant strain and clinical strains were sensitized to kanamycin by pre-treatment with DS. DS cured S. aureus infection in mice as a standalone drug as well as in conjunction with kanamycin. Synergy with kanamycin was also observed in other stilbenes apart from DS. Thus our study reveals stilbenes could be exploited towards combating S. aureus infections either as standalone drugs or in combination with existing antibiotics.
Collapse
Affiliation(s)
- Deepti Singh
- Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400 094, India
| | - Nitish Chauhan
- Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - Mrunesh Koli
- Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - Sandip Kumar Nayak
- Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India
| | - Mahesh Subramanian
- Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400 094, India.
| |
Collapse
|
26
|
Prevalence and clinical features of secondary skin lesions in septic patients with bloodstream infections. Eur J Clin Microbiol Infect Dis 2022; 41:779-786. [PMID: 35320429 DOI: 10.1007/s10096-022-04431-6] [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: 09/16/2021] [Accepted: 03/14/2022] [Indexed: 11/03/2022]
Abstract
Cutaneous manifestations developed in the course of sepsis are poorly documented in the medical literature beyond those related to specific pathogens or classical clinical pictures such as purpura fulminans or ecthyma gangrenosum. The objective of this study was to determine the overall prevalence of sepsis-related skin findings and evaluate their possible impact on the prognosis of septic patients. Single-centre, retrospective study of septic patients with documented bloodstream infections admitted in a tertiary hospital during 2019. Primary skin and soft tissue infections, and non-sepsis-related skin conditions diagnosed during hospital admission were excluded. Unselected sample of 320 episodes of sepsis in 265 patients. Secondary skin lesions were documented in 57 sepsis episodes (17.8%) in 47 patients. Purpura (petechiae/ecchymosis) was the most frequent cutaneous finding in septic patients (35.5%), with non-acral involvement in more than one-third of the episodes (38.5%), followed by skin and soft tissue erythema/oedema (25.8%) and maculopapular rashes (11.3%). Secondary skin lesions occurred more frequently in sepsis of respiratory (p = 0.027) and skin and soft tissue (p = 0.018) origin, as well as in sepsis caused by Pseudomonas aeruginosa and Stenotrophomonas maltophilia (p = 0.001). Mean hospital stay was 38.58 days and sepsis-related mortality 21.1%. Our results suggest that cutaneous involvement in the course of sepsis is frequent, with purpura being the main clinical sign. The semiology described in this study, easily identifiable by non-dermatologists, should alert clinicians to the potential unfavourable course of these patients.
Collapse
|
27
|
Surgical Procedure Time and Mortality in Patients with Infective Endocarditis Caused by Staphylococcus aureus or Streptococcus Species. J Clin Med 2022; 11:jcm11092538. [PMID: 35566663 PMCID: PMC9104614 DOI: 10.3390/jcm11092538] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 04/19/2022] [Accepted: 04/26/2022] [Indexed: 02/05/2023] Open
Abstract
Staphylococcus aureus (SA) and Streptococcus species (SS) show different clinical manifestations in infective endocarditis (IE), but the impact on the complexity of surgical treatment remains unclear. All patients with surgically treated IE due to SA or SS between July 2013 and December 2016 were extracted from a prospectively collected, single-center registry. Data on patient characteristics, surgical procedures, and postprocedural outcomes were collected. SA-IE was more common with prosthetic valves (26.3% vs. 7.3%, p = 0.04), cardiac devices (14.3% vs. 0%, p = 0.03), previous cardiac surgery (28.6% vs. 9.8%, p = 0.03), intravenous drug abuse (14.3% vs. 0%, p = 0.03), and embolic events (57.1% vs. 26.8%, p = 0.007). Preoperative CRP was significantly higher in SA-IE (median 96.1 mg/L vs. 42.4 mg/L, p = 0.002). Otherwise, SS-IE affected more cusps/leaflets (mean 2.4 vs. 1.8, p = 0.03) and led to more valve dysfunction (83.8% vs. 54.3%, p = 0.007). Surgery times did not differ between the groups, though patients with SA spent more time in the intensive care unit (median 7 vs. 4.5 days, p = 0.04). Hospital mortality did not differ, but patients with SA-IE had unfavorable long-term survival (p = 0.001). Future studies need to be larger and focus on the mechanism behind the reduced long-term survival to mitigate the deleterious effect of SA in surgically treated patients with IE.
Collapse
|
28
|
Fayed MH, Iftikhar H, Anjum S, Khyatt O, Najam M. A Severe Case of Disseminated Multifocal Methicillin-Susceptible Staphylococcal Infection in a Diabetic Patient. Cureus 2022; 14:e23483. [PMID: 35494918 PMCID: PMC9038576 DOI: 10.7759/cureus.23483] [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] [Accepted: 03/25/2022] [Indexed: 11/29/2022] Open
Abstract
Methicillin-susceptible Staphylococcus aureus (MSSA) is quite common in the environment. It can lead to a wide range of infections varying from simple boils to disseminated and metastatic infections. Disseminated multifocal MSSA infection without infective endocarditis is extremely rare. We report a case of a 48-year-old diabetic male who presented with complaints of back pain, lower limb weakness, urinary retention, and saddle sensation loss. His imaging showed an epidural abscess, spondylitis, multiple paraspinous abscess collections, iliopsoas and gluteal abscess formation, multiple abdominal abscesses, multiple cavitating lung nodules, left-sided empyema, and azygos venous thrombosis. He was managed with urgent laminectomy and evacuation of spinal epidural abscess. He was admitted under the medical team for further multidisciplinary patient care. Emergency physicians and internists should be able to recognize such cases early on to make appropriate management plans. Misdiagnosis and delay in treatment initiation can lead to high mortality and poor patient outcomes. Advanced imaging techniques should be utilized to avoid missed foci. Improved source control results in better patient outcomes.
Collapse
|
29
|
Burgin DJ, Liu R, Hsieh RC, Heinzinger LR, Otto M. Investigational agents for the treatment of methicillin-resistant Staphylococcus aureus (MRSA) bacteremia: progress in clinical trials. Expert Opin Investig Drugs 2022; 31:263-279. [PMID: 35129409 PMCID: PMC10988647 DOI: 10.1080/13543784.2022.2040015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 02/06/2022] [Indexed: 12/27/2022]
Abstract
INTRODUCTION Bacteremia caused by Staphylococcus aureus is common. Cases caused by methicillin-resistant S. aureus (MRSA) are particularly formidable and often lethal. The mortality associated with MRSA bacteremia has not significantly decreased over the past couple of decades and concerns regarding efficacy and toxicity of standard therapy highlight the need for novel agents and new therapeutic approaches. AREAS COVERED This paper explores clinical trials investigating novel therapeutic approaches to S. aureus bacteremia. There is a special focus on MRSA bacteremia. Monotherapy and combination therapies and novel antimicrobials and adjunctive therapies that are only recently being established for therapeutic use are discussed. EXPERT OPINION The unfavorable safety profile of combination antimicrobial therapy in clinical trials has outweighed its benefits. Therefore, future investigation should focus on optimizing duration and de-escalation protocols. Antibody and bacteriophage lysin-based candidates have mostly been limited to safety trials, but progress with these agents is demonstrated through a lysin-based agent receiving a phase III trial. Antibiotics indicated for use in treating MRSA skin infections see continued investigation as treatments for MRSA bacteremia despite the difficulty of completing trials in this patient population. Promising agents include dalbavancin, ceftobiprole, ceftaroline, and exebacase.
Collapse
Affiliation(s)
- Dylan J. Burgin
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Ryan Liu
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Roger C. Hsieh
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Lauren R. Heinzinger
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Michael Otto
- Pathogen Molecular Genetics Section, Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| |
Collapse
|
30
|
Lafon T, Baisse A, Barraud O, François B, Vignon P. Association of Staphylococcus aureus bacteriuria and prevalence of infective endocarditis in the emergency department. Eur J Emerg Med 2022; 29:75-77. [PMID: 34932032 DOI: 10.1097/mej.0000000000000840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Thomas Lafon
- Service d'Accueil des Urgences, CHU Dupuytren.,Inserm CIC 1435, CHU Dupuytren
| | | | - Olivier Barraud
- Inserm CIC 1435, CHU Dupuytren.,Laboratoire de Bactériologie - Virologie - Hygiène, CHU Dupuytren.,Inserm UMR 1092, Faculté de Médecine, Université Limoges
| | - Bruno François
- Inserm CIC 1435, CHU Dupuytren.,Inserm UMR 1092, Faculté de Médecine, Université Limoges.,Réanimation polyvalente, CHU Dupuytren, Limoges, France
| | - Philippe Vignon
- Inserm CIC 1435, CHU Dupuytren.,Inserm UMR 1092, Faculté de Médecine, Université Limoges.,Réanimation polyvalente, CHU Dupuytren, Limoges, France
| |
Collapse
|
31
|
Mun SJ, Kim SH, Huh K, Cho SY, Kang CI, Chung DR, Peck KR. Oral step-down therapy in patients with uncomplicated Staphylococcus aureus primary bacteremia and catheter-related bloodstream infections. J Chemother 2022; 34:319-325. [PMID: 35100939 DOI: 10.1080/1120009x.2022.2031469] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Patients with uncomplicated Staphylococcus aureus primary bacteremia and catheter-related bloodstream infection (CRBSI) should be treated for at least 14 days. However, evidence for oral step-down therapy is lacking in these patients. A retrospective cohort was identified from 2013 to 2018 in a 1,950-bed tertiary hospital. An oral antimicrobial therapy (OAT) group was defined as patients treated with oral antibiotics following less than 10 days of intravenous antimicrobial therapy (IAT). Treatment failure was defined as any case of recurrence or death within 90 days. A total of 103 patients were included in the analysis, including 32 patients treated with OAT. Rates of treatment failure were 3.2% and 12.7% in the OAT and IAT groups (P = 0.113). The length of hospital stay was shorter in the OAT group. OAT was not an independent risk factor for treatment failure. OAT may reduce the duration of hospitalization without adverse effects in these patients.
Collapse
Affiliation(s)
- Seok Jun Mun
- Division of Infectious Diseases, Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, South Korea
| | - Si-Ho Kim
- Division of Infectious Diseases, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, South Korea
| | - Kyungmin Huh
- Division of Infectious Diseases, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Sun Young Cho
- Division of Infectious Diseases, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Cheol-In Kang
- Division of Infectious Diseases, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Doo Ryeon Chung
- Division of Infectious Diseases, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Kyong Ran Peck
- Division of Infectious Diseases, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| |
Collapse
|
32
|
Larrieu-Jimenez P, Crenshaw N, Gonzalez JM, Ortega J. Progressive Lower Back Pain With New-Onset Symptoms. J Nurse Pract 2022. [DOI: 10.1016/j.nurpra.2021.10.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
33
|
Chesdachai S, Baddour LM, Sohail MR, Palraj BR, Madhavan M, Tabaja H, Fida M, Lahr BD, DeSimone DC. Evaluation of EHRA Consensus in Patients with Cardiovascular Implantable Electronic Devices and Staphylococcus aureus Bacteremia. Heart Rhythm 2021; 19:570-577. [DOI: 10.1016/j.hrthm.2021.12.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 12/10/2021] [Accepted: 12/13/2021] [Indexed: 12/11/2022]
|
34
|
Lin TL, Cheng C, Zeng WT, Duan F, Pei YH, Liu XP, Shang F, Wu KL. Anti-viral activity of Staphylococcus aureus lysates against herpes simplex virus type-I infection: an in vitro and in vivo study. Int J Ophthalmol 2021; 14:1463-1472. [PMID: 34667721 DOI: 10.18240/ijo.2021.10.01] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 02/05/2021] [Indexed: 02/08/2023] Open
Abstract
AIM To investigate the effect of Staphylococcus aureus (S. aures) lysates (SALs) on herpes simplex virus type-I (HSV1) infection in human corneal epithelial (HCE) cells and in a mouse model of HSV1 keratitis. METHODS HCE, Vero, HeLa, and BV2 cells were infected with HSV1 [HSV1 f strain, HSV1f; HSV-1-H129 with green fluorescent protein (GFP) knock-in, HSV1g]. Pre- or post-infection, SAL at various concentrations was added to the culture medium for 24h. GFP fluorescence in HSV1g or plaque formation by HSV1f were examined. The effects of heat-treated SAL, precooled acetone-precipitated SAL, and SAL subjected to ultrafiltration (100 kDa) were evaluated. The effects of other bacterial components and lysates on HSV1 infection were also tested, including lipoteichoic acid (LTA), peptidoglycan (PGN), staphylococcal protein A (SPA), and α-hemolysin from S. aureus (α-toxin) as well as lysates from a wild-type S. aureus strain, S. epidermidis, and Escherichia coli (W-SAL, SEL, and ECL, respectively). In addition, SAL eye drops were applied topically to BALB/c mice with HSV1 keratitis, followed by in vivo observations. RESULTS The cytopathic effect, plaque formation (HSV1f), and GFP expression (HSV1g) in infected cells were inhibited by SAL in a dose-dependent manner. The active component of SAL (≥100 kDa) was heat-sensitive and retained activity after acetone precipitation. In HSV1g-infected cells, treatment with LTA-sa, α-toxin, PGN-sa, or SPA did not inhibit GFP expression. SAL, W-SAL, and SEL (but not ECL) decreased GFP expression. In mice with HSV1 keratitis, SAL reduced corneal lesions by 71%. CONCLUSION The results of this study demonstrate that SAL can be used to inhibit HSV1 infection, particularly keratitis. Further studies are needed to determine the active components and mechanism underlying the effects of SAL.
Collapse
Affiliation(s)
- Tian-Lan Lin
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou 510060, Guangdong Province, China
| | - Chao Cheng
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou 510060, Guangdong Province, China
| | - Wei-Ting Zeng
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou 510060, Guangdong Province, China
| | - Fang Duan
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou 510060, Guangdong Province, China
| | - Yin-Hui Pei
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou 510060, Guangdong Province, China
| | - Xiu-Ping Liu
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou 510060, Guangdong Province, China
| | - Fu Shang
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou 510060, Guangdong Province, China
| | - Kai-Li Wu
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou 510060, Guangdong Province, China
| |
Collapse
|
35
|
Pharmacokinetics, Tissue Distribution, and Efficacy of VIO-001 (Meropenem/Piperacillin/Tazobactam) for Treatment of Methicillin-Resistant Staphylococcus aureus Bacteremia in Immunocompetent Rabbits with Chronic Indwelling Vascular Catheters. Antimicrob Agents Chemother 2021; 65:e0116821. [PMID: 34460301 DOI: 10.1128/aac.01168-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) infections of surgically implanted subcutaneous vascular catheters (SISVCs) cause serious morbidity in patients with chronic illnesses. Previous in vitro and murine models demonstrated the synergistic interaction of equimolar concentrations of meropenem/piperacillin/tazobactam (MPT) (VIO-001) against MRSA infection. We investigated the pharmacokinetics (PK) and efficacy of VIO-001 for the treatment of MRSA bacteremia in immunocompetent rabbits with SISVCs. In PK studies, we determined that optimal dosing to achieve a time above 4× MIC (T>4×MIC) of a duration of 3 to 3.30 h required a 1-h infusion with every-4-h (Q4h) dosing. Study groups in efficacy experiments consisted of MPT combinations of 100/150/100 mg/kg of body weight (MPT100), 200/300/200 mg/kg (MPT200), and 400/600/400 mg/kg (MPT400); vancomycin (VAN) at 15 mg/kg; and untreated controls (UC). The inoculum of MRSA isolate USA300-TCH1516 (1 × 103 organisms) was administered via the SISCV on day 1 and locked for 24 h. The 8-day therapy started at 24 h postinoculation. There was a significant reduction of MRSA in blood cultures from the SISVCs in all treatment groups, with full clearance on day 4, versus UCs (P < 0.05). Consistent with the clearance of SISVC-related infection, full eradication of MRSA was achieved in lungs, heart, liver, spleen, and kidneys at the end of the study versus UC (P < 0.01). These results strongly correlated with time-kill data, where MPT in the range of 4/6/4 μg/ml to 32/48/32 μg/ml demonstrated a significant 6-log decrease in the bacterial burden versus UC (P < 0.01). In summary, VIO-001 demonstrated a favorable PK/pharmacodynamic (PD) profile and activity against SISCV MRSA infection, bacteremia, and disseminated infection. This rabbit model provides a new system for understanding new antimicrobial agents against MRSA SISVC-related infection, and these data provide a basis for future clinical investigation.
Collapse
|
36
|
Hu H, Liu H, Kweon O, Hart ME. A naturally occurring point mutation in the hyaluronidase gene ( hysA1) of Staphylococcus aureus UAMS-1 results in reduced enzymatic activity. Can J Microbiol 2021; 68:1-13. [PMID: 34520677 DOI: 10.1139/cjm-2021-0110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hyaluronic acid is a high-molecular-weight polysaccharide that is widely distributed in animal tissues. Bacterial hyaluronidases degrade hyaluronic acid as secreted enzymes and have been shown to contribute to infection. Staphylococcus aureus UAMS-1 is a clinical isolate that codes for two hyaluronidases (hysA1 and hysA2). Previous research has shown the presence of a full-length HysA1 protein from the S. aureus UAMS-1 strain with no evidence of enzymatic activity. In this study, the coding and upstream promoter regions of hysA1 from the S. aureus UAMS-1 strain were cloned, sequenced, and compared to the hysA1 gene from the S. aureus Sanger 252 strain. A single base change resulting in an E480G amino acid change was identified in the hysA1 gene from the S. aureus UAMS-1 strain when compared to the hysA1 gene from S. aureus Sanger 252. A plasmid copy of hysA1 from S. aureus Sanger 252 transduced into an S. aureus UAMS-1 hysA2 deletion mutant strain restored near wild-type levels of enzymatic activity. Homology modeling of the HysA1 hyaluronidase was performed with SWISS-MODEL using hyaluronidase from Streptococcus pneumoniae as the template, followed by a series of structural analyses using PyMOL, PLIP, PDBsum, and HOPE servers. This glutamic acid is highly conserved among hyaluronidases from Staphylococcus and other gram-positive bacteria. A series of structural analyses suggested that Glu-480 in HysA1 is critically responsible for maintaining the structural and functional ensemble of the catalytic and tunnel-forming residues, which are essential for enzyme activity. The missense mutation of Glu-480 to Gly introduces a loss of side chain hydrogen bond interactions with key residues Arg-360 and Arg-364, which are responsible for the tunnel topology, resulting in displacement of the substrate from an ideal position for catalysis through a localized conformational change of the active site. There is a high degree of relatedness among several gram-positive bacterial hyaluronidases; the loss of enzymatic activity of HysA1 in the S. aureus UAMS-1 strain is most likely caused by the mutation identified in our study. The role of hyaluronidase in staphylococcal infection and the redundancy of this gene are yet to be determined.
Collapse
Affiliation(s)
- Haijing Hu
- Office of Dietary Supplement Programs, Center for Food Safety and Nutrition, U.S. Food and Drug Administration, College Park, MD 20740, USA
| | - Huanli Liu
- Branch of Microbiology, Arkansas Laboratory, Office of Regulatory Affairs, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
| | - Ohgew Kweon
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
| | - Mark E Hart
- Division of Microbiology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR 72079, USA
- Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
| |
Collapse
|
37
|
Schwarz C, Töre Y, Hoesker V, Ameling S, Grün K, Völker U, Schulze PC, Franz M, Faber C, Schaumburg F, Niemann S, Hoerr V. Host-pathogen interactions of clinical S. aureus isolates to induce infective endocarditis. Virulence 2021; 12:2073-2087. [PMID: 34490828 PMCID: PMC8425731 DOI: 10.1080/21505594.2021.1960107] [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: 01/29/2023] Open
Abstract
To evaluate potential pathomechanisms in the induction of infective endocarditis (IE), 34 Staphylococcus aureus (S. aureus) isolates, collected from patients with S. aureus endocarditis and from healthy individuals were investigated both in vitro and in vivo. S. aureus isolates were tested in vitro for their cytotoxicity, invasion and the association with platelets. Virulence factor expression profiles and cellular response were additionally investigated and tested for correlation with the ability of S. aureus to induce vegetations on the aortic valves in vivo. In an animal model of IE valvular conspicuity was assessed by in vivo magnetic resonance imaging at 9.4 T, histology and enrichment gene expression analysis. All S. aureus isolates tested in vivo caused a reliable infection and inflammation of the aortic valves, but could not be differentiated and categorized according to the measured in vitro virulence profiles and cytotoxicity. Results from in vitro assays did not correlate with the severity of IE. However, the isolates differed substantially in the activation and inhibition of pathways connected to the extracellular matrix and inflammatory response. Thus, comprehensive approaches of host-pathogen interactions and corresponding immune pathways are needed for the evaluation of the pathogenic capacity of bacteria. An improved understanding of the interaction between virulence factors and immune response in S. aureus infective endocarditis would offer novel possibilities for the development of therapeutic strategies and specific diagnostic imaging markers.
Collapse
Affiliation(s)
- Christian Schwarz
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Muenster, Muenster, Germany
| | - Yasemin Töre
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Muenster, Muenster, Germany
| | - Vanessa Hoesker
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Muenster, Muenster, Germany
| | - Sabine Ameling
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | - Katja Grün
- Department of Internal Medicine I, Jena University Hospital, Jena, Germany
| | - Uwe Völker
- Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, Greifswald, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
| | | | - Marcus Franz
- Department of Internal Medicine I, Jena University Hospital, Jena, Germany
| | - Cornelius Faber
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Muenster, Muenster, Germany
| | - Frieder Schaumburg
- Institute of Medical Microbiology, University Hospital Muenster, Muenster, Germany
| | - Silke Niemann
- Institute of Medical Microbiology, University Hospital Muenster, Muenster, Germany
| | - Verena Hoerr
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Muenster, Muenster, Germany.,Institute of Medical Microbiology, Jena University Hospital - Friedrich Schiller University Jena, Jena, Germany.,Medical Physics Group, Institute of Diagnostic and Interventional Radiology, Jena University Hospital - Friedrich Schiller University Jena, Jena, Germany
| |
Collapse
|
38
|
Florman K, Jones HT, Moores R. How to investigate and manage a patient with a Staphylococcus aureus bacteraemia. Br J Hosp Med (Lond) 2021; 82:1-7. [PMID: 34601929 DOI: 10.12968/hmed.2021.0077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Staphylococcus aureus bacteraemia is common, and associated with significant morbidity and mortality as a result of its high relapse rate and the risk of complicated infection. A positive blood culture for S. aureus should prompt a thorough patient assessment to identify a potential focus of infection, and the risk factors for the development or presence of complicated infection. Clinical management depends on the patient's characteristics and presenting features. This article gives a systematic approach to the patient with S. aureus bacteraemia, including points to look for on history and examination, the markers of complicated infection, and when to request transoesophageal echocardiography and further imaging. Treatment principles outlined include the rationale for choice of antibiotic treatment and need to involve infection specialists.
Collapse
Affiliation(s)
- Katia Florman
- Department of Acute Medicine, Royal Free Hospital, London, UK
| | - Howell T Jones
- Department of Geriatric Medicine, UCL, Royal Free Hospital, London, UK
| | - Rachel Moores
- Department of Infectious Diseases, Royal Free Hospital, London, UK
| |
Collapse
|
39
|
Taylor L, Mamani-García CS, Gutiérrez-Pingo A, Benites-Meza JK, Chambergo-Michilot D, Gálvez-Díaz NDC, Barboza JJ. Infección metastásica por Staphylococcus aureus en neonatos: a propósito de un caso. BIONATURA 2021. [DOI: 10.21931/rb/2021.06.03.25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Metastatic infection as an infrequent complication of Staphylococcus aureus bacteremia in neonates is challenging due to the limited literature. To report the clinical case of a premature neonate who developed a metastatic infection as a complication of S. aureus bacteremia. We present the case of a premature neonate admitted to the Neonatal Intensive Care Unit, diagnosed with bacterial sepsis, neonatal respiratory distress syndrome, and involvement by premature rupture of the membrane. A patch catheter was inserted, and he was successfully treated for E. coli bacteremia. He was re-admitted for late sepsis due to infection with multi-sensitive S. aureus in a patch catheter. An abscess appears on the front of the chest due to S. aureus, confirming metastatic infection. The abscess was drained with a favorable resolution of the clinical picture. In neonates submitted to invasive procedures, it is essential to monitor the clinical evolution and early identification of metastatic infection after Staphylococcus aureus bacteremia and provide early treatment to avoid sequelae.
Collapse
Affiliation(s)
| | - Carlos S. Mamani-García
- Facultad de Medicina, Universidad Nacional de San Agustín, Arequipa, Perú. Sociedad Científica de Estudiantes de Medicina Agustinos (SOCIEMA), Universidad Nacional de San Agustín, Arequipa, Perú
| | - Alexandra Gutiérrez-Pingo
- Escuela de Medicina, Universidad Nacional del Santa, Nuevo Chimbote-Ancash, Perú Sociedad Científica de Estudiantes de Medicina de la Universidad Nacional del Santa (SOCEMUNS), Universidad Nacional del Santa, Nuevo Chimbote-Ancash, Perú
| | - Jerry K. Benites-Meza
- Facultad de Medicina, Universidad Nacional de Trujillo, Trujillo, Perú Sociedad Científica de Estudiantes de Medicina de la Universidad Nacional de Trujillo (SOCEMUNT), Universidad Nacional de Trujillo, Trujillo, Perú
| | - Diego Chambergo-Michilot
- Facultad de Medicina, Universidad Científica del Sur, Lima, Perú Tau-Relaped Group, Trujillo, Perú
| | | | - Joshuan J. Barboza
- Tau-Relaped Group, Trujillo, Perú Escuela de Medicina, Universidad Señor de Sipán, Chiclayo, Perú
| |
Collapse
|
40
|
Vozza EG, Mulcahy ME, McLoughlin RM. Making the Most of the Host; Targeting the Autophagy Pathway Facilitates Staphylococcus aureus Intracellular Survival in Neutrophils. Front Immunol 2021; 12:667387. [PMID: 34220813 PMCID: PMC8242348 DOI: 10.3389/fimmu.2021.667387] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 05/28/2021] [Indexed: 12/21/2022] Open
Abstract
The success of Staphylococcus aureus as a human commensal and an opportunistic pathogen relies on its ability to adapt to several niches within the host. The innate immune response plays a key role in protecting the host against S. aureus infection; however, S. aureus adeptness at evading the innate immune system is indisputably evident. The “Trojan horse” theory has been postulated to describe a mechanism by which S. aureus takes advantage of phagocytes as a survival niche within the host to facilitate dissemination of S. aureus to secondary sites during systemic infection. Several studies have determined that S. aureus can parasitize both professional and non-professional phagocytes by manipulating the host autophagy pathway in order to create an intracellular survival niche. Neutrophils represent a critical cell type in S. aureus infection as demonstrated by the increased risk of infection among patients with congenital neutrophil disorders. However, S. aureus has been repeatedly shown to survive intracellularly within neutrophils with evidence now supporting a pathogenic role of host autophagy. By manipulating this pathway, S. aureus can also alter the apoptotic fate of the neutrophil and potentially skew other important signalling pathways for its own gain. Understanding these critical host-pathogen interactions could lead to the development of new host directed therapeutics for the treatment of S. aureus infection by removing its intracellular niche and restoring host bactericidal functions. This review discusses the current findings surrounding intracellular survival of S. aureus within neutrophils, the pathogenic role autophagy plays in this process and considers the therapeutic potential for targeting this immune evasion mechanism.
Collapse
Affiliation(s)
- Emilio G Vozza
- Host-Pathogen Interactions Group, School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - Michelle E Mulcahy
- Host-Pathogen Interactions Group, School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - Rachel M McLoughlin
- Host-Pathogen Interactions Group, School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| |
Collapse
|
41
|
Evdokimova SA, Nokhaeva VS, Karetkin BA, Guseva EV, Khabibulina NV, Kornienko MA, Grosheva VD, Menshutina NV, Shakir IV, Panfilov VI. A Study on the Synbiotic Composition of Bifidobacterium bifidum and Fructans from Arctium lappa Roots and Helianthus tuberosus Tubers against Staphylococcus aureus. Microorganisms 2021; 9:930. [PMID: 33926121 PMCID: PMC8146412 DOI: 10.3390/microorganisms9050930] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 04/22/2021] [Accepted: 04/23/2021] [Indexed: 11/16/2022] Open
Abstract
A number of mechanisms have been proposed explaining probiotics and prebiotics benefit human health, in particular, probiotics have a suppression effect on pathogen growth that can be enhanced with the introduction of prebiotics. In vitro models enhanced with computational biology can be useful for selecting a composition with prebiotics from new plant sources with the greatest synergism. Water extracts from burdock root and Jerusalem artichoke tubers were purified by ultrafiltration and activated charcoal and concentrated on a rotary evaporator. Fructans were precipitated with various concentrations of ethanol. Bifidobacterium bifidum 8 VKPM AC-2136 and Staphylococcus aureus ATCC 43300 strains were applied to estimate the synbiotic effect. The growth of bifidobacteria and staphylococci in monocultures and cocultures in broths with glucose, commercial prebiotics, as well as isolated fructans were studied. The minimum inhibitory concentrations (MICs) of lactic and acetic acids for the Staphylococcus strain were determined. A quantitative model joining the formation of organic acids by probiotics as antagonism factors and the MICs of pathogens (as the measure of their inhibition) was tested in cocultures and showed a high predictive value (R2 ≥ 0.86). The synbiotic factor obtained from the model was calculated based on the experimental data and obtained constants. Fructans precipitated with 20% ethanol and Bifidobacterium bifidum have the greater synergism against Staphylococcus.
Collapse
Affiliation(s)
- Svetlana A. Evdokimova
- Department of Biotechnology, Faculty of Biotechnology and Industrial Ecology, D. Mendeleev University of Chemical Technology, Miusskaya Sq., 9, 125047 Moscow, Russia; (S.A.E.); (V.S.N.); (N.V.K.); (V.D.G.); (I.V.S.); (V.I.P.)
| | - Vera S. Nokhaeva
- Department of Biotechnology, Faculty of Biotechnology and Industrial Ecology, D. Mendeleev University of Chemical Technology, Miusskaya Sq., 9, 125047 Moscow, Russia; (S.A.E.); (V.S.N.); (N.V.K.); (V.D.G.); (I.V.S.); (V.I.P.)
| | - Boris A. Karetkin
- Department of Biotechnology, Faculty of Biotechnology and Industrial Ecology, D. Mendeleev University of Chemical Technology, Miusskaya Sq., 9, 125047 Moscow, Russia; (S.A.E.); (V.S.N.); (N.V.K.); (V.D.G.); (I.V.S.); (V.I.P.)
| | - Elena V. Guseva
- Department of Cybernetics of Chemical Technological Processes, Faculty of Digital Technologies and Chemical Engineering, D. Mendeleev University of Chemical Technology, Miusskaya Sq., 9, 125047 Moscow, Russia; (E.V.G.); (N.V.M.)
| | - Natalia V. Khabibulina
- Department of Biotechnology, Faculty of Biotechnology and Industrial Ecology, D. Mendeleev University of Chemical Technology, Miusskaya Sq., 9, 125047 Moscow, Russia; (S.A.E.); (V.S.N.); (N.V.K.); (V.D.G.); (I.V.S.); (V.I.P.)
| | - Maria A. Kornienko
- Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological Agency, 119435 Moscow, Russia;
| | - Veronika D. Grosheva
- Department of Biotechnology, Faculty of Biotechnology and Industrial Ecology, D. Mendeleev University of Chemical Technology, Miusskaya Sq., 9, 125047 Moscow, Russia; (S.A.E.); (V.S.N.); (N.V.K.); (V.D.G.); (I.V.S.); (V.I.P.)
| | - Natalia V. Menshutina
- Department of Cybernetics of Chemical Technological Processes, Faculty of Digital Technologies and Chemical Engineering, D. Mendeleev University of Chemical Technology, Miusskaya Sq., 9, 125047 Moscow, Russia; (E.V.G.); (N.V.M.)
| | - Irina V. Shakir
- Department of Biotechnology, Faculty of Biotechnology and Industrial Ecology, D. Mendeleev University of Chemical Technology, Miusskaya Sq., 9, 125047 Moscow, Russia; (S.A.E.); (V.S.N.); (N.V.K.); (V.D.G.); (I.V.S.); (V.I.P.)
| | - Victor I. Panfilov
- Department of Biotechnology, Faculty of Biotechnology and Industrial Ecology, D. Mendeleev University of Chemical Technology, Miusskaya Sq., 9, 125047 Moscow, Russia; (S.A.E.); (V.S.N.); (N.V.K.); (V.D.G.); (I.V.S.); (V.I.P.)
| |
Collapse
|
42
|
Soares AC, Soares JC, Rodrigues VC, Oliveira ON, Capparelli Mattoso LH. Controlled molecular architectures in microfluidic immunosensors for detecting Staphylococcus aureus. Analyst 2020; 145:6014-6023. [PMID: 32779664 DOI: 10.1039/d0an00714e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Detection of pathogenic microorganisms is essential for food quality control and diagnosis of various diseases, which is currently performed with high-cost, sophisticated methods. In this paper, we report on a low-cost detection method based on impedance spectroscopy to detect Staphylococcus aureus (S. aureus). The immunosensors were made with microfluidic devices made of interdigitated electrodes coated with layer-by-layer (LbL) films of chitosan and chondroitin sulfate, on which a layer of anti-S. aureus antibodies was adsorbed. The limit of detection was 2.83 CFU mL-1 with a limit of quantification of 9.42 CFU mL-1 for immunosensors with 10-bilayer LbL films. This level of sensitivity is sufficient to detect traces of bacteria that cause mastitis in milk, which we have confirmed by distinguishing milk samples containing various concentrations of S. aureus from pure milk and milk contaminated with Escherichia coli (E. coli) and Salmonella. Distinction of these samples was made possible by projecting the electrical impedance data with the interactive document mapping (IDMAP) technique. The high sensitivity and selectivity are attributed to the highly specific interaction with anti-S. aureus antibodies captured with polarization-modulated reflection absorption spectroscopy (PM-IRRAS), with adsorption on the antibodies explained with the Langmuir-Freundlich model. Since these immunosensors are stable for up to 25 days and detection measurements can be made within minutes, the methodology proposed is promising for monitoring S. aureus contamination in the food industry and hospitals, and in detecting bovine mastitis.
Collapse
Affiliation(s)
- Andrey Coatrini Soares
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, 13560-970 São Carlos, SP, Brazil.
| | | | | | | | | |
Collapse
|
43
|
1,2,3-Triazole-containing hybrids with potential antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA). Eur J Med Chem 2020; 206:112686. [PMID: 32795773 DOI: 10.1016/j.ejmech.2020.112686] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 06/25/2020] [Indexed: 01/10/2023]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA), as a classic reason for genuine skin and flimsy tissues diseases, is a worldwide general wellbeing risk and has already tormented humanity for a long history, creating a critical need for the development of new classes of antibacterials. 1,2,3-Triazole moiety, readily interact with diverse enzymes and receptors in organisms through weak bond interaction, is among the most common frameworks present in the bioactive molecules. 1,2,3-Triazole derivatives, especially 1,2,3-triazole-containing hybrids, possess broad-spectrum activity against a panel of clinically important bacteria including drug-resistant pathogens, so rational design of 1,2,3-triazole derivatives may open a door for the opportunities on the development of novel anti-MRSA agents. This review is an endeavour to highlight the current scenario of 1,2,3-triazole-containing hybrids with potential anti-MRSA activity, covering articles published between 2010 and 2020.
Collapse
|