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Tkaczyk C, Newton M, Patnaik MM, Thom G, Strain M, Gamson A, Daramola O, Murthy A, Douthwaite J, Stepanov O, Boger E, Yang H, Esser MT, Lidwell A, DiGiandomenico A, Santos L, Sellman BR. In vivo mRNA expression of a multi-mechanistic mAb combination protects against Staphylococcus aureus infection. Mol Ther 2024; 32:2505-2518. [PMID: 38822525 DOI: 10.1016/j.ymthe.2024.05.036] [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: 12/04/2023] [Revised: 04/30/2024] [Accepted: 05/29/2024] [Indexed: 06/03/2024] Open
Abstract
Single monoclonal antibodies (mAbs) can be expressed in vivo through gene delivery of their mRNA formulated with lipid nanoparticles (LNPs). However, delivery of a mAb combination could be challenging due to the risk of heavy and light variable chain mispairing. We evaluated the pharmacokinetics of a three mAb combination against Staphylococcus aureus first in single chain variable fragment scFv-Fc and then in immunoglobulin G 1 (IgG1) format in mice. Intravenous delivery of each mRNA/LNP or the trio (1 mg/kg each) induced functional antibody expression after 24 h (10-100 μg/mL) with 64%-78% cognate-chain paired IgG expression after 3 days, and an absence of non-cognate chain pairing for scFv-Fc. We did not observe reduced neutralizing activity for each mAb compared with the level of expression of chain-paired mAbs. Delivery of the trio mRNA protected mice in an S. aureus-induced dermonecrosis model. Intravenous administration of the three mRNA in non-human primates achieved peak serum IgG levels ranging between 2.9 and 13.7 μg/mL with a half-life of 11.8-15.4 days. These results suggest nucleic acid delivery of mAb combinations holds promise and may be a viable option to streamline the development of therapeutic antibodies.
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Affiliation(s)
- Christine Tkaczyk
- AstraZeneca, Early Vaccines & Immune Therapies, Gaithersburg, MD 20878, USA.
| | - Michael Newton
- AstraZeneca, BioPharmaceutical Development, BioPharmaceuticals R&D, Gaithersburg, MD 20878, USA
| | - Mun Mun Patnaik
- AstraZeneca, Early Vaccines & Immune Therapies, Gaithersburg, MD 20878, USA
| | - George Thom
- AstraZeneca, Discovery Sciences, BioPharmaceuticals R&D, Cambridge CB21 6GH, UK
| | - Martin Strain
- AstraZeneca, Biologics Engineering, BioPharmaceuticals R&D, Cambridge CB216GH, UK
| | - Adam Gamson
- AstraZeneca, Early Vaccines & Immune Therapies, Gaithersburg, MD 20878, USA
| | - Olalekan Daramola
- AstraZeneca, BioPharmaceutical Development, BioPharmaceuticals R&D, Cambridge CB21 6GH, UK
| | - Andal Murthy
- AstraZeneca, BioPharmaceutical Development, BioPharmaceuticals R&D, Cambridge CB21 6GH, UK
| | - Julie Douthwaite
- AstraZeneca, Discovery Sciences, BioPharmaceuticals R&D, Cambridge CB21 6GH, UK
| | - Oleg Stepanov
- Clinical Pharmacology and Pharmacometrics, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 8PA, UK
| | - Elin Boger
- Drug Metabolism and Pharmacokinetics, Research and Early Development, Respirator & immunology, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Haitao Yang
- Clinical Pharmacology and Pharmacometrics, BioPharmaceuticals R&D, AstraZeneca, Gaithersburg, MD 20878, USA
| | - Mark T Esser
- AstraZeneca, Early Vaccines & Immune Therapies, Gaithersburg, MD 20878, USA
| | - Ashley Lidwell
- AstraZeneca, Early Vaccines & Immune Therapies, Gaithersburg, MD 20878, USA
| | | | - Luis Santos
- AstraZeneca, BioPharmaceutical Development, BioPharmaceuticals R&D, Gaithersburg, MD 20878, USA
| | - Bret R Sellman
- AstraZeneca, Early Vaccines & Immune Therapies, Gaithersburg, MD 20878, USA
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Li R, Fan C, Liu G, Duan H, Qian S. Cfhr1 gene deficiency exacerbates Staphylococcus aureus-induced sepsis and acute lung injury through complement alternative pathway hyperactivation. Biochem Biophys Res Commun 2024; 737:150466. [PMID: 39128222 DOI: 10.1016/j.bbrc.2024.150466] [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: 06/11/2024] [Revised: 07/25/2024] [Accepted: 07/26/2024] [Indexed: 08/13/2024]
Abstract
OBJECTIVE To explore the role of excessive activation of the complement alternative pathway (AP) in acute lung injury (ALI) and sepsis induced by Staphylococcus aureus. Subsequently, we aimed to define the effects of Cfhr gene deletion on Factor H expression, AP activation, and the development of sepsis-induced ALI. METHODS A sepsis-induced ALI model was established in Cfhr1-knockout mice by tail vein injection of S. aureus. Sepsis scores, bacterial load in lungs, and cytokine and complement factor levels in blood and lung tissues were evaluated at 6, 12, and 24 h after model establishment. Real-time quantitative PCR and RNA sequencing (RNA-seq) were employed to assess the expression of complement pathway-associated molecules and identify differentially expressed genes (DEGs) related to immune responses. RESULTS Compared to wild-type mice, Cfhr1-knockout mice exhibited significantly increased C3a formation in lung tissues following S. aureus infection, indicating enhanced terminal complement pathway activation. Notably, these mice also had higher bacterial colony counts in the lungs, suggesting impaired S. aureus clearance. Transcriptome analysis provided further insights into the impact of Cfhr1 deletion on biological processes and signalling pathways involved in immune response regulation. CONCLUSION Cfhr1 deletion leads to excessive AP activation, exacerbating S. aureus-induced sepsis and ALI.
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Affiliation(s)
- Rubo Li
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 100045, Beijing, China
| | - Chaonan Fan
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 100045, Beijing, China
| | - Gang Liu
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 100045, Beijing, China
| | - Hongnian Duan
- Baoding Hospital, Beijing Children's Hospital, Capital Medical University (Baoding Children's Hospital), China
| | - Suyun Qian
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, 100045, Beijing, China.
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Kouroupis PC, O'Rourke N, Kelly S, McKittrick M, Noppe E, Reyes LF, Rodriguez A, Martin-Loeches I. Hospital-acquired bacterial pneumonia in critically ill patients: from research to clinical practice. Expert Rev Anti Infect Ther 2024; 22:423-433. [PMID: 38743435 DOI: 10.1080/14787210.2024.2354828] [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: 02/26/2024] [Accepted: 05/09/2024] [Indexed: 05/16/2024]
Abstract
INTRODUCTION Hospital-acquired pneumonia (HAP) represents a significant cause of mortality among critically ill patients admitted to Intensive Care Units (ICUs). Timely and precise diagnosis is imperative to enhance therapeutic efficacy and patient outcomes. However, the diagnostic process is challenged by test limitations and a wide-ranging list of differential diagnoses, particularly in patients exhibiting escalating oxygen requirements, leukocytosis, and increased secretions. AREAS COVERED This narrative review aims to update diagnostic modalities, facilitating the prompt identification of nosocomial pneumonia while guiding, developing, and assessing therapeutic interventions. A comprehensive literature review was conducted utilizing the MEDLINE/PubMed database from 2013 to April 2024. EXPERT OPINION An integrated approach that integrates clinical, microbiological, and imaging tools is paramount. Progress in diagnostic techniques, including novel molecular methods, the expanding utilization and accuracy of bedside ultrasound, and the emergence of Artificial Intelligence, coupled with an improved comprehension of lung microbiota and host-pathogen interactions, continues to enhance our capability to accurately and swiftly identify HAP and its causative agents. This advancement enables the refinement of treatment strategies and facilitates the implementation of precision medicine approaches.
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Affiliation(s)
- Pompeo Costantino Kouroupis
- Department of Intensive Care Medicine, Multidisciplinary Intensive Care Research Organization (MICRO), St James' Hospital, Dublin, Ireland
| | - Niall O'Rourke
- Department of Intensive Care Medicine, Multidisciplinary Intensive Care Research Organization (MICRO), St James' Hospital, Dublin, Ireland
| | - Sinead Kelly
- Department of Intensive Care Medicine, Multidisciplinary Intensive Care Research Organization (MICRO), St James' Hospital, Dublin, Ireland
| | - Myles McKittrick
- Department of Intensive Care Medicine, Multidisciplinary Intensive Care Research Organization (MICRO), St James' Hospital, Dublin, Ireland
| | - Elne Noppe
- Department of Intensive Care Medicine, Multidisciplinary Intensive Care Research Organization (MICRO), St James' Hospital, Dublin, Ireland
| | - Luis F Reyes
- Department of Intensive Care Medicine, Unisabana Center for Translational Science, Chia, Colombia
- Department of Intensive Care Medicine, Clinica Universidad de La Sabana, Chia, Colombia
- Department of Intensive Care Medicine, Pandemic Sciences Institute, University of Oxford, Oxford, UK
| | - Alejandro Rodriguez
- Critical Care Department, Hospital Universitari de Tarragona Joan XXIII, Tarragona, Spain
- Department of Intensive Care Medicine, URV/IISPV/CIBERES, Tarragona, Spain
| | - Ignacio Martin-Loeches
- Department of Intensive Care Medicine, Multidisciplinary Intensive Care Research Organization (MICRO), St James' Hospital, Dublin, Ireland
- Hospital Clinic, Universitat de Barcelona, IDIBAPS, CIBERES, Barcelona, Spain
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Rocha GD, de Simoni Gouveia JJ, da Costa MM, Soares RAN, Gouveia GV. Resistance and virulence in Staphylococcus aureus by whole-genome sequencing: a comparative approach in blaZ-positive isolates. Braz J Microbiol 2024; 55:955-967. [PMID: 38265572 PMCID: PMC10920469 DOI: 10.1007/s42770-023-01243-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 12/28/2023] [Indexed: 01/25/2024] Open
Abstract
Mastitis caused by Staphylococcus aureus is a worldwide problem in dairy farms, in part because of the pathogenicity of the bacteria, biofilm formation, and mechanisms of antimicrobial resistance that make the disease difficult to diagnose and treat, which is typically done with the use of beta-lactam antibiotics. The aim of the present study was to determine the virulence and resistance factors of S. aureus isolates from subclinical mastitis, blaZ + /mecA - /mecC - , resistant and sensitive to oxacillin. All isolates were classified as CC97 by MLST analysis, a clonal complex well adapted to the mammary gland and although STAU23 and STAU73 were resistant to oxacillin while STAU32 and STAU78 were sensitive, the genomic analysis identified only the blaZ operon corresponding to resistance to beta-lactams. However, the presence of the sdrC gene was revealed exclusively in resistant isolates, an important adhesin in the colonization process that potentiates pathogenicity in S. aureus. In addition, resistance islands (REIs) were identified in these isolates, suggesting more conserved REIs. In the analysis of SNPs throughout the genome, mutations were found in the trmB and smpB genes of the resistant isolates and in the murD and rimM genes of the sensitive isolates. This study highlights the potential benefit of genome-wide characterization tools to identify molecular mechanisms of S. aureus in bovine mastitis.
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Affiliation(s)
- Gabriela Dias Rocha
- Universidade Federal Do Vale Do São Francisco, Campus Ciências Agrárias, Rodovia Km 12, Lote 543, Projeto de Irrigação Nilo Coelho S/N, C1, Petrolina, PE, 56300-000, Brazil
| | - João José de Simoni Gouveia
- Universidade Federal Do Vale Do São Francisco, Campus Ciências Agrárias, Rodovia Km 12, Lote 543, Projeto de Irrigação Nilo Coelho S/N, C1, Petrolina, PE, 56300-000, Brazil
| | - Mateus Matiuzzi da Costa
- Universidade Federal Do Vale Do São Francisco, Campus Ciências Agrárias, Rodovia Km 12, Lote 543, Projeto de Irrigação Nilo Coelho S/N, C1, Petrolina, PE, 56300-000, Brazil
| | - Riani Ananda Nunes Soares
- Universidade Federal Do Vale Do São Francisco, Campus Ciências Agrárias, Rodovia Km 12, Lote 543, Projeto de Irrigação Nilo Coelho S/N, C1, Petrolina, PE, 56300-000, Brazil
| | - Gisele Veneroni Gouveia
- Universidade Federal Do Vale Do São Francisco, Campus Ciências Agrárias, Rodovia Km 12, Lote 543, Projeto de Irrigação Nilo Coelho S/N, C1, Petrolina, PE, 56300-000, Brazil.
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Balta I, McCleery D, David SRF, Pet E, Stef D, Iancu T, Pet I, Stef L, Corcionivoschi N. The mechanistic role of natural antimicrobials in preventing Staphylococcus aureus invasion of MAC-T cells using an in vitro mastitis model. Ir Vet J 2024; 77:3. [PMID: 38414081 PMCID: PMC10898119 DOI: 10.1186/s13620-024-00265-0] [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: 02/08/2024] [Accepted: 02/15/2024] [Indexed: 02/29/2024] Open
Abstract
BACKGROUND Starting primarily as an inflammation of the mammary gland, mastitis is frequently driven by infectious agents such as Staphylococcus aureus. Mastitis has a large economic impact globally, which includes diagnostic, treatment, and the production costs not to mention the potential milk contamination with antimicrobial residues. Currently, mastitis prevention and cure depends on intramammary infusion of antimicrobials, yet, their overuse risks engendering resistant pathogens, posing further threats to livestock. METHODS In our study we aimed to investigate, in vitro, using bovine mammary epithelial cells (MAC-T), the efficacy of the AuraShield an antimicrobial mixture (As) in preventing S. aureus attachment, internalisation, and inflammation. The antimicrobial mixture (As) included: 5% maltodextrin, 1% sodium chloride, 42% citric acid, 18% sodium citrate, 10% silica, 12% malic acid, 9% citrus extract and 3% olive extract (w/w). RESULTS AND DISCUSSION Herein we show that As can significantly reduce both adherence and invasion of MAC-T cells by S. aureus, with no impact on cell viability at all concentrations tested (0.1, 0.2, 0.5, 1%) compared with untreated controls. The anti-apoptotic effect of As was achieved by significantly reducing cellular caspase 1, 3 and 8 activities in the infected MAC-T cells. All As concentrations were proven to be subinhibitory, suggesting that Ac can reduce S. aureus virulence without bacterial killing and that the effect could be dual including a host modulation effect. In this context, we show that As can reduce the expression of S. aureus clumping factor (ClfB) and block its interaction with the host Annexin A2 (AnxA2), resulting in decreased bacterial adherence in infection of MAC-T cells. Moreover, the ability of As to block AnxA2 had a significant decreasing effect on the levels of pro inflammatory cytokine released upon S. aureus interaction with MAC-T cells. CONCLUSION The results presented in this study indicate that mixtures of natural antimicrobials could potentially be considered an efficient alternative to antibiotics in treating S. aureus induced mastitis.
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Affiliation(s)
- Igori Balta
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania
| | - David McCleery
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Northern Ireland, Belfast, BT4 3SD, UK
| | - Saida Roxana Feier David
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania
| | - Elena Pet
- Faculty of Management and Rural Development, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania
| | - Ducu Stef
- Faculty of Food Engineering, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania
| | - Tiberiu Iancu
- Faculty of Management and Rural Development, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania
| | - Ioan Pet
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Northern Ireland, Belfast, BT4 3SD, UK
| | - Lavinia Stef
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Northern Ireland, Belfast, BT4 3SD, UK
| | - Nicolae Corcionivoschi
- Faculty of Bioengineering of Animal Resources, University of Life Sciences King Mihai I from Timisoara, Timisoara, 300645, Romania.
- Bacteriology Branch, Veterinary Sciences Division, Agri-Food and Biosciences Institute, Northern Ireland, Belfast, BT4 3SD, UK.
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Mihai MM, Popa MI, Holban AM, Gheorghe-Barbu I, Popa LG, Chifiriuc MC, Giurcăneanu C, Bleotu C, Cucu CI, Lazăr V. Clinical and microbiological features of host-bacterial interplay in chronic venous ulcers versus other types of chronic skin ulcers. Front Microbiol 2024; 14:1326904. [PMID: 38375067 PMCID: PMC10875999 DOI: 10.3389/fmicb.2023.1326904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 12/19/2023] [Indexed: 02/21/2024] Open
Abstract
Introduction Chronic venous ulcers of the lower limbs develop in the context of advanced venous disease and have a significant impact on the patient's quality of life, being associated with depression and worrisome suicide rates, as well as with an economic burden caused by increased medical care costs and high epidemiological risks of healthcare associated infections and emergence of strains resistant to multiple classes of antibiotics and/ or antiseptics. Although numerous studies have investigated the composition of the chronic wounds microbiome, either by culture-dependent or independent methods, there are no data on the association between virulence and resistance profiles of strains isolated from venous ulcers and the clinical picture of this pathology. The elucidation of pathogenic mechanisms, at both phenotypic and molecular level, is crucial in the fight against these important human microbial agents, in order to develop novel biomarkers and discover new therapeutic targets. Methods In this study we aimed to characterize the phenotypic virulence profiles (including the ability to develop biofilms) of microorganisms isolated from chronic skin wounds and to correlate them with the clinical symptomatology. Considering the high incidence of Staphylococcus aureus infections in chronic ulcers, but also the ability of this species to develop multi-drug resistance, we performed an more in-depth study of the phenotypic and genotypic virulence profiles of methicillin-resistant Staphylococcus. Results The study revealed important differences regarding the clinical evolution and virulence profiles of microorganisms isolated from lower limb wounds, as well as between patients diagnosed with chronic venous ulcers and those with lesions of different etiology.
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Affiliation(s)
- Mara Mădălina Mihai
- Department of Oncologic Dermatology–“Elias” University Emergency Hospital, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania
- Department of Botany-Microbiology, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Bucharest, Romania
| | - Mircea Ioan Popa
- Department of Microbiology—“Cantacuzino” Institute, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania
| | - Alina Maria Holban
- Department of Botany-Microbiology, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Bucharest, Romania
| | - Irina Gheorghe-Barbu
- Department of Botany-Microbiology, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Bucharest, Romania
| | - Liliana Gabriela Popa
- Department of Oncologic Dermatology–“Elias” University Emergency Hospital, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania
| | - Mariana-Carmen Chifiriuc
- Department of Botany-Microbiology, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Bucharest, Romania
| | - Călin Giurcăneanu
- Department of Oncologic Dermatology–“Elias” University Emergency Hospital, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania
| | - Coralia Bleotu
- Department of Botany-Microbiology, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Bucharest, Romania
- Cellular and Molecular Department, “Ştefan S. Nicolau” Institute of Virology, Bucharest, Romania
| | - Corina Ioana Cucu
- Department of Oncologic Dermatology–“Elias” University Emergency Hospital, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania
| | - Veronica Lazăr
- Department of Botany-Microbiology, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, Bucharest, Romania
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Yang H, Wang P, Li X, Wei Q, Yu J, Wu X, Huang Y, Li R, Du W, Zeng S, Wu H, Wang S, Zhang J. A randomised, double-blind, placebo-controlled, first-in-human phase I study to characterise the safety, pharmacokinetics and immunogenicity of 9MW1411 in healthy Chinese subjects. Int J Antimicrob Agents 2024; 63:107075. [PMID: 38157918 DOI: 10.1016/j.ijantimicag.2023.107075] [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: 07/09/2023] [Revised: 12/16/2023] [Accepted: 12/21/2023] [Indexed: 01/03/2024]
Abstract
INTRODUCTION 9MW1411 is a humanised monoclonal antibody against Staphylococcus aureus alpha-toxin. The safety, pharmacokinetics (PK) and immunogenicity of 9MW1411 should be characterised in humans before further clinical development. METHODS A single-centre, randomised, double-blind, placebo-controlled phase I clinical study was conducted in humans for the first time. A total of 42 healthy Chinese subjects were randomised to receive a single ascending dose of 9MW1411 (200, 600, 1500, 3000 or 5000 mg) or placebo. Safety, PK parameters and anti-drug antibody (ADA) were analysed. Monte Carlo simulations (MCS) were performed to predict the probability of target attainment (PTA) after single dose IV administration of 1500, 3000 and 5000 mg of 9MW1411. RESULTS Thirty-four subjects received 9MW1411, completed the study and were included in data analysis. Five cases of drug-related AEs occurred in four subjects. All the adverse events (AEs) were mild or moderate. The Cmax, AUC0-t and AUC0-∞ of 9MW1411 increased with dose after IV administration of 200 to 5000 mg 9MW1411. The mean Cmax increased from 85.40 ± 5.43 to 2082.11 ± 343.10 µg/mL and AUC0-∞ from 29,511.68 ± 5550.91 to 729,985.49 ± 124,932.18 h·µg/mL. The elimination half-life (T1/2) was 19-23 days. 9MW1411 ADA was positive in three subjects. MCS indicated that a single dose of 3000 or 5000 mg 9MW1411 could achieve PTA > 90% for S. aureus. CONCLUSIONS 9MW1411 has shown a good safety profile in healthy Chinese subjects after a single dose up to 5000 mg. A single dose of 3000 mg 9MW1411 is appropriate for use in subsequent studies.
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Affiliation(s)
- Haijing Yang
- Phase Ⅰ Clinical Research Center, Huashan Hospital, Fudan University, Shanghai, China; Key Laboratory of Clinical Pharmacology of Antibiotics, National Health Commission, Shanghai, China; National Clinical Research Center for Geriatric Diseases (Huashan Hospital), Shanghai, China
| | - Peipei Wang
- Mabwell (Shanghai) Bioscience Co., Ltd, Shanghai, China
| | - Xin Li
- Key Laboratory of Clinical Pharmacology of Antibiotics, National Health Commission, Shanghai, China; National Clinical Research Center for Geriatric Diseases (Huashan Hospital), Shanghai, China; Institute of Antibiotics, Huashan Hospital, Fudan University, Shanghai, China
| | - Qiong Wei
- Phase Ⅰ Clinical Research Center, Huashan Hospital, Fudan University, Shanghai, China; Key Laboratory of Clinical Pharmacology of Antibiotics, National Health Commission, Shanghai, China; National Clinical Research Center for Geriatric Diseases (Huashan Hospital), Shanghai, China
| | - Jicheng Yu
- Phase Ⅰ Clinical Research Center, Huashan Hospital, Fudan University, Shanghai, China; Key Laboratory of Clinical Pharmacology of Antibiotics, National Health Commission, Shanghai, China; National Clinical Research Center for Geriatric Diseases (Huashan Hospital), Shanghai, China
| | - Xiaojie Wu
- Phase Ⅰ Clinical Research Center, Huashan Hospital, Fudan University, Shanghai, China; Key Laboratory of Clinical Pharmacology of Antibiotics, National Health Commission, Shanghai, China; National Clinical Research Center for Geriatric Diseases (Huashan Hospital), Shanghai, China
| | - Ying Huang
- Key Laboratory of Clinical Pharmacology of Antibiotics, National Health Commission, Shanghai, China; National Clinical Research Center for Geriatric Diseases (Huashan Hospital), Shanghai, China; Nursing Department, Huashan Hospital, Fudan University, Shanghai, China
| | - Ruowan Li
- Mabwell (Shanghai) Bioscience Co., Ltd, Shanghai, China
| | - Weijuan Du
- Mabwell (Shanghai) Bioscience Co., Ltd, Shanghai, China
| | - Shaoqing Zeng
- Mabwell (Shanghai) Bioscience Co., Ltd, Shanghai, China
| | - Hailan Wu
- Key Laboratory of Clinical Pharmacology of Antibiotics, National Health Commission, Shanghai, China; National Clinical Research Center for Geriatric Diseases (Huashan Hospital), Shanghai, China; Institute of Antibiotics, Huashan Hospital, Fudan University, Shanghai, China
| | - Shuhai Wang
- Mabwell (Shanghai) Bioscience Co., Ltd, Shanghai, China.
| | - Jing Zhang
- Phase Ⅰ Clinical Research Center, Huashan Hospital, Fudan University, Shanghai, China; Key Laboratory of Clinical Pharmacology of Antibiotics, National Health Commission, Shanghai, China; National Clinical Research Center for Geriatric Diseases (Huashan Hospital), Shanghai, China; Institute of Antibiotics, Huashan Hospital, Fudan University, Shanghai, China.
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8
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Ong ZX, Kannan B, Phillips ARJ, Becker DL. Investigation of Staphylococcus aureus Biofilm-Associated Toxin as a Potential Squamous Cell Carcinoma Therapeutic. Microorganisms 2024; 12:293. [PMID: 38399697 PMCID: PMC10891956 DOI: 10.3390/microorganisms12020293] [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: 12/27/2023] [Revised: 01/17/2024] [Accepted: 01/17/2024] [Indexed: 02/25/2024] Open
Abstract
Cancer therapies developed using bacteria and their components have been around since the 19th century. Compared to traditional cancer treatments, the use of bacteria-derived compounds as cancer therapeutics could offer a higher degree of specificity, with minimal off-target effects. Here, we explored the use of soluble bacteria-derived toxins as a potential squamous cell carcinoma (SCC) therapeutic. We optimized a protocol to generate Staphylococcus aureus biofilm-conditioned media (BCM), where soluble bacterial products enriched in the development of biofilms were isolated from a bacterial culture and applied to SCC cell lines. Bioactive components of S. aureus ATCC 29213 (SA29213) BCM display selective toxicity towards cancerous human skin SCC-12 at low doses, while non-cancerous human keratinocyte HaCaT and fibroblast BJ-5ta are minimally affected. SA29213 BCM treatment causes DNA damage to SCC-12 and initiates Caspase 3-dependent-regulated cell death. The use of the novel SA29213 bursa aurealis transposon mutant library led to the identification of S. aureus alpha hemolysin as the main bioactive compound responsible for the observed SCC-12-specific toxicity. The antibody neutralisation of Hla eradicates the cytotoxicity of SA29213 BCM towards SCC-12. Hla displays high SCC-12-specific toxicity, which is exerted primarily through Hla-ADAM10 interaction, Hla oligomerisation, and pore formation. The high target specificity and potential to cause cell death in a controlled manner highlight SA29213 Hla as a good candidate as an alternative SCC therapeutic.
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Affiliation(s)
- Zi Xin Ong
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore
- Skin Research Institute Singapore, Singapore 308232, Singapore
- Nanyang Institute of Technology in Health and Medicine, Interdisciplinary Graduate Programme, Nanyang Technological University, Singapore 639798, Singapore
| | - Bavani Kannan
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore
| | | | - David L. Becker
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore
- Skin Research Institute Singapore, Singapore 308232, Singapore
- National Skin Centre, Singapore 308205, Singapore
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9
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Dietrich M, Besser M, Stuermer EK. Characterization of the Human Plasma Biofilm Model (hpBIOM) to Identify Potential Therapeutic Targets for Wound Management of Chronic Infections. Microorganisms 2024; 12:269. [PMID: 38399673 PMCID: PMC10892339 DOI: 10.3390/microorganisms12020269] [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: 12/10/2023] [Revised: 01/18/2024] [Accepted: 01/24/2024] [Indexed: 02/25/2024] Open
Abstract
The treatment of chronic wounds still represents a major challenge in wound management. Recent estimates suggest that 60-80% of chronic wounds are colonized by pathogenic microorganisms, which are strongly considered to have a major inhibiting influence on the healing process. By means of an innovative biofilm model based on human plasma, the time-dependent behavior of various bacterial strains under wound-milieu-like conditions were investigated, and the growth habits of different cocci species were compared. Undescribed fusion events between colonies of MRSA as well as of Staphylococcus epidermidis were detected, which were associated with the remodeling and reorganization of the glycocalyx of the wound tissue. After reaching a maximum colony size, the spreading of individual bacteria was observed. Interestingly, the combination of different cocci species with Pseudomonas aeruginosa in the human plasma biofilm revealed partial synergistic effects in these multispecies organizations. RT-qPCR analyses gave a first impression of the relevant proteins involved in the formation and maturation of biofilms, especially the role of fibrinogen-binding proteins. Knowledge of the maturation and growth behavior of persistent biofilms investigated in a translational human biofilm model reflects a starting point for the development of novel tools for the treatment of chronic wounds.
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Affiliation(s)
- Michael Dietrich
- Institute of Virology and Microbiology, Centre for Biomedical Education and Research (ZBAF), Faculty of Health, Witten/Herdecke University, 58455 Witten, Germany
| | - Manuela Besser
- Institute of Virology and Microbiology, Centre for Biomedical Education and Research (ZBAF), Faculty of Health, Witten/Herdecke University, 58455 Witten, Germany
| | - Ewa Klara Stuermer
- Department of Vascular Medicine, University Heart and Vascular Center, University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany
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10
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Lin H, Song L, Zhou S, Fan C, Zhang M, Huang R, Zhou R, Qiu J, Ma S, He J. A Hybrid Antimicrobial Peptide Targeting Staphylococcus aureus with a Dual Function of Inhibiting Quorum Sensing Signaling and an Antibacterial Effect. J Med Chem 2023; 66:17105-17117. [PMID: 38099725 DOI: 10.1021/acs.jmedchem.3c02027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
Community-associated methicillin-resistant Staphylococcus aureus (MRSA) is now a major cause of bacterial infection. Antivirulence therapy does not stimulate evolution of a pathogen toward a resistant phenotype, providing a novel method to treat infectious diseases. Here, we used a cyclic peptide of CP7, an AIP-III variant that specifically inhibited the virulence and biofilm formation of Staphylococcus aureus (S. aureus) in a nonbiocidal manner, to conjugate with a broad-spectrum antimicrobial peptide (AMP) via two N-termini to obtain a hybrid AMP called CP7-FP13-2. This peptide not only specifically inhibited the production of virulence of S. aureus at low micromolar concentrations but also killed S. aureus, including MRSA, by disrupting the integrity of the bacterial cell membrane. In addition, CP7-FP13-2 inhibited the formation of the S. aureus biofilm and showed good antimicrobial efficacy against the S. aureus-infected Kunming mice model. Therefore, this study provides a promising strategy against the resistance and virulence of S. aureus.
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Affiliation(s)
- Haixing Lin
- Group of peptides and natural products Research, School of Pharmaceutical Sciences, Southern Medical University, 1838 Guangzhou Avenue North, Guangzhou 510515, P. R. China
- Department of Urology, Tongren Municipal People's Hospital, 120 Taoyuan Avenue, Tongren, Guizhou 554300, P. R. China
| | - Li Song
- Group of peptides and natural products Research, School of Pharmaceutical Sciences, Southern Medical University, 1838 Guangzhou Avenue North, Guangzhou 510515, P. R. China
| | - Shaofen Zhou
- Group of peptides and natural products Research, School of Pharmaceutical Sciences, Southern Medical University, 1838 Guangzhou Avenue North, Guangzhou 510515, P. R. China
| | - Cuiqiong Fan
- Group of peptides and natural products Research, School of Pharmaceutical Sciences, Southern Medical University, 1838 Guangzhou Avenue North, Guangzhou 510515, P. R. China
| | - Minna Zhang
- Department of Nephrology, Tongren Municipal People's Hospital, 120 Taoyuan Avenue, Tongren, Guizhou 554300, P. R. China
| | - Ruifeng Huang
- Group of peptides and natural products Research, School of Pharmaceutical Sciences, Southern Medical University, 1838 Guangzhou Avenue North, Guangzhou 510515, P. R. China
| | - Runhong Zhou
- Group of peptides and natural products Research, School of Pharmaceutical Sciences, Southern Medical University, 1838 Guangzhou Avenue North, Guangzhou 510515, P. R. China
| | - Jingnan Qiu
- Group of peptides and natural products Research, School of Pharmaceutical Sciences, Southern Medical University, 1838 Guangzhou Avenue North, Guangzhou 510515, P. R. China
| | - Shuaiqi Ma
- Group of peptides and natural products Research, School of Pharmaceutical Sciences, Southern Medical University, 1838 Guangzhou Avenue North, Guangzhou 510515, P. R. China
| | - Jian He
- Group of peptides and natural products Research, School of Pharmaceutical Sciences, Southern Medical University, 1838 Guangzhou Avenue North, Guangzhou 510515, P. R. China
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11
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Wang J, An H, Ding M, Liu Y, Wang S, Jin Q, Wu Q, Dong H, Guo Q, Tian X, Liu J, Zhang J, Zhu T, Li J, Shao Z, Briles DE, Veening JW, Zheng H, Zhang L, Zhang JR. Liver macrophages and sinusoidal endothelial cells execute vaccine-elicited capture of invasive bacteria. Sci Transl Med 2023; 15:eade0054. [PMID: 38117903 DOI: 10.1126/scitranslmed.ade0054] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 11/29/2023] [Indexed: 12/22/2023]
Abstract
Vaccination has substantially reduced the morbidity and mortality of bacterial diseases, but mechanisms of vaccine-elicited pathogen clearance remain largely undefined. We report that vaccine-elicited immunity against invasive bacteria mainly operates in the liver. In contrast to the current paradigm that migrating phagocytes execute vaccine-elicited immunity against blood-borne pathogens, we found that invasive bacteria are captured and killed in the liver of vaccinated host via various immune mechanisms that depend on the protective potency of the vaccine. Vaccines with relatively lower degrees of protection only activated liver-resident macrophage Kupffer cells (KCs) by inducing pathogen-binding immunoglobulin M (IgM) or low amounts of IgG. IgG-coated pathogens were directly captured by KCs via multiple IgG receptors FcγRs, whereas IgM-opsonized bacteria were indirectly bound to KCs via complement receptors of immunoglobulin superfamily (CRIg) and complement receptor 3 (CR3) after complement C3 activation at the bacterial surface. Conversely, the more potent vaccines engaged both KCs and liver sinusoidal endothelial cells by inducing higher titers of functional IgG antibodies. Endothelial cells (ECs) captured densely IgG-opsonized pathogens by the low-affinity IgG receptor FcγRIIB in a "zipper-like" manner and achieved bacterial killing predominantly in the extracellular milieu via an undefined mechanism. KC- and endothelial cell-based capture of antibody-opsonized bacteria also occurred in FcγR-humanized mice. These vaccine protection mechanisms in the liver not only provide a comprehensive explanation for vaccine-/antibody-boosted immunity against invasive bacteria but also may serve as in vivo functional readouts of vaccine efficacy.
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Affiliation(s)
- Juanjuan Wang
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
- Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Haoran An
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
- Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Ming Ding
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
| | - Yanhong Liu
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
| | - Shaomeng Wang
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
| | - Qian Jin
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
| | - Qi Wu
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
| | - Haodi Dong
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
- Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
| | - Qile Guo
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
| | - Xianbin Tian
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
| | | | | | - Tao Zhu
- Cansino Biologics, Tianjin 300301, China
| | | | - Zhujun Shao
- National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102299, China
| | - David E Briles
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Jan-Willem Veening
- Department of Fundamental Microbiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne 1015, Switzerland
| | | | - Linqi Zhang
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
| | - Jing-Ren Zhang
- Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China
- Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China
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12
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Wang Y, Tang M, Deng H, Hong Z, Liang Z, Huang Y, Zeng C, Yang K. Ampelopsin attenuates Staphylococcus aureus Alpha-Toxin-Induced Lung Injury. Microb Pathog 2023; 183:106316. [PMID: 37634577 DOI: 10.1016/j.micpath.2023.106316] [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: 06/25/2023] [Revised: 08/18/2023] [Accepted: 08/20/2023] [Indexed: 08/29/2023]
Abstract
Staphylococcus aureus is a prevalent cause of lung infections in hospitals and communities, and can cause a wide spectrum of human infections. Due to the bottleneck caused by antibiotic resistance and substantial increases in morbidity and mortality, targeting the virulence factors released by S. aureus as an alternative prevention and treatment method has become a promising approach. Ampelopsin, a component of vine tea, has promising potential for treating S. aureus-induced acute lung injury. In this study, the effects of ampelopsin were investigated on a mouse model of acute lung injury established using S. aureus 8325-4 and the α-hemolysin (hla) silent strain DU1090. The hla silent strain did not cause mortality in mice, whereas lethal and sublethal concentrations of S. aureus 8325-4 caused high mortality. Notably, ampelopsin treatment protected against mortality stemming from S. aureus infection. Ampelopsin yielded enhancements in lung barrier function, decreased total protein leakage in the alveolar lavage fluid, and modulated inflammatory signaling pathway-related proteins, thereby reducing the release of pro-inflammatory factors and improving respiratory dysfunction. Moreover, ampelopsin prevented the upregulation of ADAM10 activity, leading to E-cadherin mucin cleavage. In conclusion, our findings establish the key role of alpha -toxin in infectious lung injury in S. aureus and provide support for ampelopsin as an effective therapeutic approach to improve lung injury.
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Affiliation(s)
- Yi Wang
- School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, 530200, PR China
| | - Mulan Tang
- School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, 530200, PR China
| | - Haojian Deng
- School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, 530200, PR China
| | - Zhengshan Hong
- School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, 530200, PR China
| | - Zhi Liang
- School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, 530200, PR China
| | - Yumei Huang
- School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, 530200, PR China
| | - Chunhui Zeng
- School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, 530200, PR China.
| | - Ke Yang
- School of Pharmacy, Guangxi University of Chinese Medicine, Nanning, 530200, PR China.
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13
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Räz AK, Andreoni F, Boumasmoud M, Bergada-Pijuan J, Schweizer TA, Mairpady Shambat S, Hasse B, Zinkernagel AS, Brugger SD. Limited Adaptation of Staphylococcus aureus during Transition from Colonization to Invasive Infection. Microbiol Spectr 2023; 11:e0259021. [PMID: 37341598 PMCID: PMC10433843 DOI: 10.1128/spectrum.02590-21] [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: 07/19/2022] [Accepted: 05/24/2023] [Indexed: 06/22/2023] Open
Abstract
Staphylococcus aureus carriage is a risk factor for invasive infections. Unique genetic elements favoring the transition from colonizing to invasive phenotype have not yet been identified, and phenotypic adaptation traits are understudied. We therefore assessed phenotypic and genotypic profiles of 11 S. aureus isolate pairs sampled from colonized patients simultaneously suffering from invasive S. aureus infections. Ten out of 11 isolate pairs displayed the same spa and multilocus sequence type, suggesting colonization as an origin for the invasive infection. Systematic analysis of colonizing and invasive isolate pairs showed similar adherence, hemolysis, reproductive fitness properties, antibiotic tolerance, and virulence in a Galleria mellonella infection model, as well as minimal genetic differences. Our results provide insights into the similar phenotypes associated with limited adaptation between colonizing and invasive isolates. Disruption of the physical barriers of mucosa or skin was identified in the majority of patients, further emphasizing colonization as a major risk factor for invasive disease. IMPORTANCE S. aureus is a major pathogen of humans, causing a wide range of diseases. The difficulty to develop a vaccine and antibiotic treatment failure warrant the exploration of novel treatment strategies. Asymptomatic colonization of the human nasal passages is a major risk factor for invasive disease, and decolonization procedures have been effective in preventing invasive infections. However, the transition of S. aureus from a benign colonizer of the nasal passages to a major pathogen is not well understood, and both host and bacterial properties have been discussed as being relevant for this behavioral change. We conducted a thorough investigation of patient-derived strain pairs reflecting colonizing and invasive isolates in a given patient. Although we identified limited genetic adaptation in certain strains, as well as slight differences in adherence capacity among colonizing and invasive isolates, our work suggests that barrier breaches are a key event in the disease continuum of S. aureus.
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Affiliation(s)
- Anna K. Räz
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Federica Andreoni
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Mathilde Boumasmoud
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Judith Bergada-Pijuan
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Tiziano A. Schweizer
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Srikanth Mairpady Shambat
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Barbara Hasse
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Annelies S. Zinkernagel
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Silvio D. Brugger
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
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14
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Hachem AA, Filkins LM, Kidane YH, Raj P, Tareen NG, Arana CA, Muthukrishnan G, Copley LA. Staphylococcus aureus isolates from children with clinically differentiated osteomyelitis exhibit distinct transcriptomic signatures. PLoS One 2023; 18:e0288758. [PMID: 37561761 PMCID: PMC10414669 DOI: 10.1371/journal.pone.0288758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 07/04/2023] [Indexed: 08/12/2023] Open
Abstract
There is substantial genomic heterogeneity among Staphylococcus aureus isolates of children with acute hematogenous osteomyelitis (AHO) but transcriptional behavior of clinically differentiated strains has not been previously described. This study evaluates transcriptional activity of S. aureus isolates of children with AHO that may regulate metabolism, biosynthesis, or virulence during bacterial growth and pathogenesis. In vitro growth kinetics were compared between three S. aureus clinical isolates from children with AHO who had mild, moderate, and severe illness. Total RNA sequencing was performed for each isolate at six separate time points throughout the logarithmic phase of growth. The NASA RNA-Sequencing Consensus Pipeline was used to identify differentially expressed genes allowing for 54 comparisons between the three isolates during growth. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment pathways were used to evaluate transcriptional variation in metabolism, biosynthesis pathways and virulence potential of the isolates. The S. aureus isolates demonstrated differing growth kinetics under standardized conditions with the mild isolate having higher optical densities with earlier and higher peak rates of growth than that of the other isolates (p<0.001). Enrichment pathway analysis established distinct transcriptional signatures according to both sampling time and clinical severity. Moderate and severe isolates demonstrated pathways of bacterial invasion, S. aureus infection, quorum sensing and two component systems. In comparison, the mild strain favored biosynthesis and metabolism. These findings suggest that transcriptional regulation during the growth of S. aureus may impact the pathogenetic mechanisms involved in the progression of severity of illness in childhood osteomyelitis. The clinical isolates studied demonstrated a tradeoff between growth and virulence. Further investigation is needed to evaluate these transcriptional pathways in an animal model or during active clinical infections of children with AHO.
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Affiliation(s)
- Ahmad A. Hachem
- Department of Pediatrics, University of Florida College of Medicine –Jacksonville, Jacksonville, FL, United States of America
| | - Laura M. Filkins
- Department of Microbiology, University of Texas Southwestern, Children’s Health System of Texas, Dallas, TX, United States of America
| | - Yared H. Kidane
- Center for Pediatric Bone Biology and Translational Research, Scottish Rite for Children, Dallas, TX, United States of America
| | - Prithvi Raj
- Microbiome Research Laboratory, University of Texas Southwestern, Dallas, TX, United States of America
| | - Naureen G. Tareen
- Department of Pediatric Orthopaedic Surgery, Children’s Health System of Texas, Dallas, TX, United States of America
| | - Carlos A. Arana
- Genomics Core, University of Texas Southwestern, Dallas, TX, United States of America
| | - Gowrishankar Muthukrishnan
- Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY, United States of America
| | - Lawson A. Copley
- Department of Pediatric Orthopaedic Surgery, Children’s Health System of Texas, Dallas, TX, United States of America
- Department of Pediatric Orthopaedic Surgery, University of Texas Southwestern, Dallas, TX, United States of America
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15
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Zheng H, Zhong B, Wang Q, Li X, Chen J, Liu L, Liu T. ZnO-Doped Metal-Organic Frameworks Nanoparticles: Antibacterial Activity and Mechanisms. Int J Mol Sci 2023; 24:12238. [PMID: 37569611 PMCID: PMC10418459 DOI: 10.3390/ijms241512238] [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: 06/19/2023] [Revised: 07/26/2023] [Accepted: 07/28/2023] [Indexed: 08/13/2023] Open
Abstract
Metal-Organic Frameworks (MOFs) offer new ideas for the design of antibacterial materials because of their antibacterial properties, high porosity and specific surface area, low toxicity and good biocompatibility compared with other nanomaterials. Herein, a novel antimicrobial nanomaterial, MIL-101(Fe)@ZnO, has been synthesized by hydrothermal synthesis and characterized by FTIR, UV-vis, ICP-OES, XRD, SEM, EDS and BET to show that the zinc ions are doped into the crystal lattice of MIL-101(Fe) to form a Fe-Zn bimetallic structure. MIL-101(Fe)@ZnO was found to be effective against a wide range of antibacterial materials including Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Acinetobacter baumannii, Acinetobacter junii and Staphylococcus epidermidis. It has a significant antibacterial effect, weak cytotoxicity, high safety performance and good biocompatibility. Meanwhile, MIL-101(Fe)@ZnO was able to achieve antibacterial effects by causing cells to produce ROS, disrupting the cell membrane structure, and causing protein leakage and lipid preoxidation mechanisms. In conclusion, MIL-101(Fe)@ZnO is an easy-to-prepare antimicrobial nanomaterial with broad-spectrum bactericidal activity and low toxicity.
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Affiliation(s)
| | | | | | | | | | | | - Tiantian Liu
- School of Public Health, Guangdong Pharmaceutical University, Guangzhou 510310, China; (H.Z.); (B.Z.); (Q.W.); (X.L.); (J.C.); (L.L.)
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16
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Wang C, Xiong Y, Bao C, Wei Y, Wen Z, Cao X, Yu Z, Deng X, Li G, Deng Q. Antibacterial and anti-biofilm activity of radezolid against Staphylococcus aureus clinical isolates from China. Front Microbiol 2023; 14:1131178. [PMID: 37180277 PMCID: PMC10169660 DOI: 10.3389/fmicb.2023.1131178] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Accepted: 03/24/2023] [Indexed: 05/16/2023] Open
Abstract
Although the potent antibacterial ability of radezolid against Staphylococcus aureus has been widely reported worldwide, its antibacterial and anti-biofilm activity against the S. aureus clinical isolates from China remains elusive. In this study, the minimum inhibitory concentration (MIC) of radezolid was determined in S. aureus clinical isolates from China using the agar dilution method, and the relationship between radezolid susceptibility and ST distribution was also investigated. The anti-biofilm activity of radezolid against S. aureus was determined by a crystal violet assay and compared with that of linezolid and contezolid. The quantitative proteomics of S. aureus treated with radezolid was analyzed, and the genetic mutations in radezolid-induced resistant S. aureus were determined by whole-genome sequencing. The dynamic changes in transcriptional expression levels of several biofilm-related genes were analyzed by quantitative RT-PCR. Our data showed that radezolid MIC ranged from ≤0.125 to 0.5 mg/L, which was almost 1/4 × MIC of linezolid against S. aureus, indicating the greater antibacterial activity of radezolid than linezolid. The S. aureus clinical isolates with radezolid MICs of 0.5 mg/L were most widely distributed in ST239 of MRSA and ST7 of MSSA. Moreover, the more robust anti-biofilm activity of radezolid with subinhibitory concentrations (1/8 × MIC and 1/16 × MIC) was demonstrated against S. aureus when compared with that of contezolid and linezolid. Genetic mutations were found in glmS, 23S rRNA, and DUF1542 domain-containing protein in radezolid-induced resistant S. aureus selected by in vitro induction of drug exposure. Quantitative proteomic analysis of S. aureus indicated that the global expression of some biofilm-related and virulence-related proteins was downregulated. Quantitative RT-PCR further confirmed that the expressions of some downregulated biofilm-related proteins, including sdrD, carA, sraP, hlgC, sasG, spa, sspP, fnbA, and oatA, were decreased after 12 h and 24 h of exposure to radezolid. Conclusively, radezolid shows robust antibacterial and anti-biofilm activity against S. aureus clinical isolates from China when compared with contezolid and linezolid.
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Affiliation(s)
- Cong Wang
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
- Department of Microbiology, The First Affiliated Hospital of Jiamusi University, Jiamusi, China
| | - Yanpeng Xiong
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
| | - Chai Bao
- Department of Dermatology, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
| | - Ying Wei
- Department of Microbiology, The First Affiliated Hospital of Jiamusi University, Jiamusi, China
- Heilongjiang Medical Service Management Evaluation Center, Harbin, Heilongjiang, China
| | - Zewen Wen
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
| | - Xinyi Cao
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
- Department of Microbiology, The First Affiliated Hospital of Jiamusi University, Jiamusi, China
| | - Zhijian Yu
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
| | - Xiangbing Deng
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
| | - Guiqiu Li
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
- Quality Control Center of Hospital Infection Management of Shenzhen, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
| | - Qiwen Deng
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen, China
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17
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Mabroum H, El Baza H, Ben Youcef H, Oudadesse H, Noukrati H, Barroug A. Design of Antibacterial Apatitic Composite Cement Loaded with Ciprofloxacin: Investigations on the Physicochemical Properties, Release Kinetics, and Antibacterial Activity. Int J Pharm 2023; 637:122861. [PMID: 36948475 DOI: 10.1016/j.ijpharm.2023.122861] [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: 01/12/2023] [Revised: 03/08/2023] [Accepted: 03/13/2023] [Indexed: 03/24/2023]
Abstract
This work aims to develop an injectable and antibacterial composite cement for bone substitution and prevention/treatment of bone infections. This cement is composed of calcium phosphate, calcium carbonate, bioactive glass, sodium alginate, and ciprofloxacin. The effect of ciprofloxacin on the microstructure, chemical composition, setting properties, cohesion, injectability, and compressive strength was investigated. The in vitro drug release kinetics and the antibacterial activity of ciprofloxacin-loaded composites against staphylococcus aureus and Escherichia coli pathogens were investigated. XRD and FTIR analysis demonstrated that the formulated cements are composed of a nanocrystalline carbonated apatite analogous to the mineral part of the bone. The evaluation of the composite cement's properties revealed that the incorporation of 3 and 9 wt% of ciprofloxacin affects the microstructural and physicochemical properties of the cement, resulting in a prolonged setting time, and a slight decrease in injectability and compressive strength. The in vitro drug release study revealed sustained release profiles over 18 days. The amounts of ciprofloxacin released per day (0.2 -15.2 mg/L) depend on the cement composition and the amount of ciprofloxacin incorporated. The antibacterial activity of ciprofloxacin-loaded cement composites attested to their effectiveness to inhibit the growth of Staphylococcus aureus and Escherichia coli.
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Affiliation(s)
- Hanaa Mabroum
- Cadi Ayyad University, Faculty of Sciences Semlalia, 2390, 40000, Marrakech, Morocco; Institute of Biological Sciences, ISSB, Faculty of medical sciences (FMS), Mohammed VI Polytechnic University (UM6P), Ben Guerir, 43150, Morocco
| | - Hamza El Baza
- Institute of Biological Sciences, ISSB, Faculty of medical sciences (FMS), Mohammed VI Polytechnic University (UM6P), Ben Guerir, 43150, Morocco
| | - Hicham Ben Youcef
- High Throughput Multidisciplinary Research Laboratory (HTMR), Mohammed VI Polytechnic University (UM6P), Ben Guerir, 43150, Morocco
| | | | - Hassan Noukrati
- Institute of Biological Sciences, ISSB, Faculty of medical sciences (FMS), Mohammed VI Polytechnic University (UM6P), Ben Guerir, 43150, Morocco
| | - Allal Barroug
- Cadi Ayyad University, Faculty of Sciences Semlalia, 2390, 40000, Marrakech, Morocco; Institute of Biological Sciences, ISSB, Faculty of medical sciences (FMS), Mohammed VI Polytechnic University (UM6P), Ben Guerir, 43150, Morocco
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18
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Epigenetic and Drug Response Modulation of Epigalocaten-In-3-Gallate in Staphylococcus aureus with Divergent Resistance Phenotypes. Antibiotics (Basel) 2023; 12:antibiotics12030519. [PMID: 36978386 PMCID: PMC10044528 DOI: 10.3390/antibiotics12030519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 02/23/2023] [Accepted: 03/01/2023] [Indexed: 03/08/2023] Open
Abstract
Healthcare-associated methicillin-resistant Staphylococcus aureus infections represent extremely high morbidity and mortality rates worldwide. We aimed to assess the antimicrobial potential and synergistic effect between Epigalocatenin-3-gallate (EGCG) and different antibiotics in S. aureus strains with divergent resistance phenotypes. EGCG exposure effects in epigenetic and drug resistance key modulators were also evaluated. S. aureus strains (n = 32) were isolated from infected patients in a Lisbon hospital. The identification of the S. aureus resistance phenotype was performed through automatized methods. The antibiotic synergistic assay was performed through disk diffusion according to EUCAST guidelines with co-exposure to EGCG (250, 100, 50 and 25 µg/mL). The bacteria’s molecular profile was assessed through FTIR spectroscopy. The transcriptional expression of OrfX, SpdC and WalKR was performed by using qRT-PCR. FTIR-spectroscopy analysis enabled the clear discrimination of MRSA/MSSA strains and the EGCG exposure effect in the bacteria’s molecular profiles. Divergent resistant phenotypes were associated with divergent transcriptional expression of the epigenetic modulator OrfX, particularly in MRSA strains, as well as the key drug response modulators SpdC and WalKR. These results clearly demonstrate that EGCG exposure alters the expression patterns of key epigenetic and drug response genes with associated divergent-resistant profiles, which supports its potential for antimicrobial treatment and/or therapeutic adjuvant against antibiotic-resistant microorganisms.
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19
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Lam JC, Stokes W. The Golden Grapes of Wrath - Staphylococcus aureus Bacteremia: A Clinical Review. Am J Med 2023; 136:19-26. [PMID: 36179908 DOI: 10.1016/j.amjmed.2022.09.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Accepted: 09/12/2022] [Indexed: 12/13/2022]
Abstract
Staphylococcus aureus bacteremia is common and associated with fatality rates approximating 25%. We provide a brief overview of S. aureus bacteremia from a clinical and microbiological lens and review the relevant evidence and literature gaps in its management. Using a case-based approach, evidence and clinical judgement are meshed to highlight and justify the 5 core interventions that ought to be performed for all cases of S. aureus bacteremia: 1) appropriate anti-staphylococcal therapy, 2) screening echocardiography, 3) assessment for metastatic phenomena and source control, 4) decision on duration of antimicrobial therapy, and 5) Infectious Diseases consultation.
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Affiliation(s)
- John C Lam
- Division of Infectious Diseases, Department of Medicine, University of California Los Angeles.
| | - William Stokes
- Provincial Laboratory for Public Health, Alberta Precision Laboratories, Alberta, Canada; Department of Pathology and Laboratory Medicine; Division of Infectious Diseases, Department of Medicine, University of Alberta, Edmonton, Canada
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20
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Zhong J, Wei M, Yang C, Yin Y, Bai Y, Li R, Gu L. Molecular Epidemiology of Community-Acquired Methicillin-Resistant Staphylococcus aureus and Clinical Characteristics of Different Sites of Infection. Infect Drug Resist 2023; 16:1485-1497. [PMID: 36945681 PMCID: PMC10024868 DOI: 10.2147/idr.s401998] [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: 12/29/2022] [Accepted: 02/09/2023] [Indexed: 03/15/2023] Open
Abstract
Purpose Since community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) was recognized, the molecular epidemiology of CA-MRSA in China has been diverse. It is unclear whether different sites of CA-MRSA infection differ in antimicrobial resistance and clinical characteristics. The purpose of this study was to identify the molecular types, virulence factors and antimicrobial resistance of CA-MRSA strains and to analyze the clinical characteristics of different sites of CA-MRSA infection. Methods 26 CA-MRSA strains were screened from Beijing Chao-Yang Hospital from 2014 to 2022. SCCmec type, MLST type, spa type, Panton-Valentine leukocidin (PVL), hemolysin α (Hla), phenolic soluble regulatory protein α (PSMα), toxic shock syndrome toxin-1 (TSST-1), and enterotoxin (SE) A to E were detected by PCR and gene sequencing. Antimicrobial susceptibility tests and the clinical features of CA-MRSA infection cases were collected for statistical analysis. Results The predominant type of CA-MRSA was ST59-t437-IV. New non-epidemic types, SCCmec VII, were also found. PVL was seen in 65.4% of CA-MRSA strains and TSST-1 was only be detected in 3.8% of CA-MRSA strain which caused poor prognosis. There were three types of infections: pneumonia (61.5%), infective endocarditis (7.7%), and skin and soft tissue infections (SSTIs) (30.8%). CA-MRSA pneumonia cases were secondary to influenza infection (37.5%). Patients with CA-MRSA-associated infective endocarditis were more likely to have underlying cardiac diseases. Patients with CA-MRSA-associated SSTIs were more likely to have a history of diabetes mellitus, and strains in this group were more susceptible to erythromycin and clindamycin. Conclusion ST59-t437-IV was the primary CA-MRSA type in our research and in China. We proposed that TSST-1 might be one of the indicators to predict the severity and prognosis of CA-MRSA infection. Different sites of CA-MRSA infection had difference in antibiotics susceptibility testing and underlying diseases of patients. It could provide a new perspective on treating different types of CA-MRSA infection.
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Affiliation(s)
- Jingjing Zhong
- Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Ming Wei
- Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Chunxia Yang
- Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Yudong Yin
- Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Yu Bai
- Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Ran Li
- Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Li Gu
- Department of Infectious Diseases and Clinical Microbiology, Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, People's Republic of China
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21
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Staphylococcal Corneocyte Adhesion: Assay Optimization and Roles of Aap and SasG Adhesins in the Establishment of Healthy Skin Colonization. Microbiol Spectr 2022; 10:e0246922. [PMID: 36219106 PMCID: PMC9769725 DOI: 10.1128/spectrum.02469-22] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Staphylococcus aureus is an opportunistic pathogen that causes the majority of wound and soft tissue infections. The accumulation-associated protein (Aap) from S. epidermidis and surface protein G (SasG) from S. aureus are cell wall-anchored (CWA) proteins known to be important in adhesion to healthy corneocytes from human skin. We investigated the mechanisms by which S. aureus colonizes healthy human skin by developing an optimized corneocyte adhesion assay. Trypan blue was used for enhanced red autofluorescent visualization of corneocytes with an overlay of green-fluorescent bacteria. The percent area of bacterial adhesion for images acquired by a fluorescence microscope was quantified using Fiji ImageJ. Using this optimized imaging procedure, differences in adhesion between various species and strains of staphylococci were measured. The ability of purified SasG to reduce Staphylococcus epidermidis adhesion was investigated in order to determine if these CWA proteins can compete for binding sites. To further test CWA-mediated adhesion, we engineered a nonadhering S. carnosus strain to express full-length SasG from two methicillin-resistant S. aureus (MRSA) strains. Finally, we demonstrated that the SasG A domain was a critical region of this surface protein for adherence to healthy human corneocytes. The developed imaging and expression methods are useful for studying staphylococcal adhesion to healthy human skin and have the potential to be used with a wide variety of fluorescently labeled organisms on both healthy and disease-state (such as atopic dermatitis) corneocytes. IMPORTANCE The skin is the largest organ of the human body and acts as a shield against hazards such as harmful bacteria like Staphylococcus aureus. A diverse skin microbiota and immune cross talk control S. aureus numbers. S. aureus can bind to healthy skin and subsequently proliferate when the skin barrier is compromised, such as in a wound or in patients with atopic dermatitis (AD). It is important to understand these mechanisms in an effort to prevent pathogenic bacteria from causing infection. We describe an augmented corneocyte adhesion assay using fluorescence microscopy to study binding of various staphylococcal species to healthy human skin cells. In addition, we tested the ability of homologous proteins from different staphylococcal species to reduce binding, and developed a new S. carnosus expression system to test individual protein binding properties. Our newly developed methods and findings will enhance the understanding of how staphylococci bind to healthy human skin.
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22
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Bacterial Protein Tyrosine Phosphatases as Possible Targets for Antimicrobial Therapies in Response to Antibiotic Resistance. Antioxidants (Basel) 2022; 11:antiox11122397. [PMID: 36552605 PMCID: PMC9774629 DOI: 10.3390/antiox11122397] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/21/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022] Open
Abstract
The review is focused on the bacterial protein tyrosine phosphatases (PTPs) utilized by bacteria as virulence factors necessary for pathogenicity. The inhibition of bacterial PTPs could contribute to the arrest of the bacterial infection process. This mechanism could be utilized in the design of antimicrobial therapy as adjuvants to antibiotics. The review summaries knowledge on pathogenic bacterial protein tyrosine phosphatases (PTPs) involved in infection process, such as: PTPA and PTPB from Staphylococcus aureus and Mycobacterium tuberculosis; SptP from Salmonella typhimurium; YopH from Yersinia sp. and TbpA from Pseudomonas aeruginosa. The review focuses also on the potential inhibitory compounds of bacterial virulence factors and inhibitory mechanisms such as the reversible oxidation of tyrosine phosphatases.
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23
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Grousd JA, Dresden BP, Riesmeyer AM, Cooper VS, Bomberger JM, Richardson AR, Alcorn JF. Novel Requirement for Staphylococcal Cell Wall-Anchored Protein SasD in Pulmonary Infection. Microbiol Spectr 2022; 10:e0164522. [PMID: 36040164 PMCID: PMC9603976 DOI: 10.1128/spectrum.01645-22] [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: 07/15/2022] [Accepted: 08/16/2022] [Indexed: 02/04/2023] Open
Abstract
Staphylococcus aureus can complicate preceding viral infections, including influenza virus. A bacterial infection combined with a preceding viral infection, known as superinfection, leads to worse outcomes than a single infection. Most of the pulmonary infection literature focuses on the changes in immune responses to bacteria between homeostatic and virally infected lungs. However, it is unclear how much of an influence bacterial virulence factors have in single or superinfection. Staphylococcal species express a broad range of cell wall-anchored proteins (CWAs) that have roles in host adhesion, nutrient acquisition, and immune evasion. We screened the importance of these CWAs using mutants lacking individual CWAs in vivo in both bacterial pneumonia and influenza superinfection. In bacterial pneumonia, the lack of individual CWAs leads to various decreases in bacterial burden, lung damage, and immune infiltration into the lung. However, the presence of a preceding influenza infection partially abrogates the requirement for CWAs. In the screen, we found that the uncharacterized CWA S. aureus surface protein D (SasD) induced changes in both inflammatory and homeostatic lung markers. We further characterized a SasD mutant (sasD A50.1) in the context of pneumonia. Mice infected with sasD A50.1 have decreased bacterial burden, inflammatory responses, and mortality compared to wild-type S. aureus. Mice also have reduced levels of interleukin-1β (IL-1β), likely derived from macrophages. Reductions in IL-1β transcript levels as well as increased macrophage viability point at differences in cell death pathways. These data identify a novel virulence factor for S. aureus that influences inflammatory signaling within the lung. IMPORTANCE Staphylococcus aureus is a common commensal bacterium that can cause severe infections, such as pneumonia. In the lung, viral infections increase the risk of staphylococcal pneumonia, leading to combined infections known as superinfections. The most common virus associated with S. aureus pneumonia is influenza, and superinfections lead to worse patient outcomes than either infection alone. While there is much known about how the immune system differs between healthy and virally infected lungs, the role of bacterial virulence factors in single and superinfection is less understood. The significance of our research is identifying bacterial components that play a role in the initiation of lung injury, which could lead to future therapies to prevent pulmonary single or superinfection with S. aureus.
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Affiliation(s)
- Jennifer A. Grousd
- Department of Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
- Department of Pediatrics, UPMC Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Brooke P. Dresden
- Department of Pediatrics, UPMC Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Abigail M. Riesmeyer
- Department of Pediatrics, UPMC Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Vaughn S. Cooper
- Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Jennifer M. Bomberger
- Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Anthony R. Richardson
- Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - John F. Alcorn
- Department of Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
- Department of Pediatrics, UPMC Children’s Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
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24
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Chen J, Chen J, Wang Z, Chen C, Zheng J, Yu Z, Deng Q, Zhao Y, Wen Z. 20S-ginsenoside Rg3 inhibits the biofilm formation and haemolytic activity of Staphylococcus aureus by inhibiting the SaeR/SaeS two-component system. J Med Microbiol 2022; 71. [DOI: 10.1099/jmm.0.001587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Introduction.
Staphylococcus aureus
is a major cause of chronic diseases and biofilm formation is a contributing factor. 20S-ginsenoside Rg3 (Rg3) is a natural product extracted from the traditional Chinese medicine red ginseng.
Gap statement. The effects of Rg3 on biofilm formation and haemolytic activity as well as its antibacterial mechanism against
S. aureus
have not been reported.
Aim. This study aimed to investigate the effects of Rg3 on biofilm formation and haemolytic activity as well as its antibacterial action against clinical
S. aureus
isolates.
Methodology. The effect of Rg3 on biofilm formation of clinical
S. aureus
isolates was studied by crystal violet staining. Haemolytic activity analysis was carried out. Furthermore, the influence of Rg3 on the proteome profile of
S. aureus
was studied by quantitative proteomics to clarify the mechanism underlying its antibacterial action and further verified by reverse transcription quantitative real-time polymerase chain reaction (RT-qPCR).
Results. Rg3 significantly inhibited biofilm formation and haemolytic activity in clinical
S. aureus
isolates. A total of 63 with >1.5-fold changes in expression were identified, including 34 upregulated proteins and 29 downregulated proteins. Based on bioinformatics analysis, the expression of several virulence factors and biofilm-related proteins, containing CopZ, CspA, SasG, SaeR/SaeS two-component system and SaeR/SaeS-regulated proteins, including leukocidin-like protein 2, immunoglobulin-binding protein G (Sbi) and fibrinogen-binding protein, in the
S. aureu
s of the Rg3-treated group was downregulated. RT-qPCR confirmed that Rg3 inhibited the regulation of SaeR/SaeS and decreased the transcriptional levels of the biofilm-related genes CopZ, CspA and SasG.
Conclusions. Rg3 reduces the formation of biofilm by reducing cell adhesion and aggregation. Further, Rg3 can inhibit the SaeR/SaeS two-component system, which acts as a crucial signal transduction system for the anti-virulence activity of Rg3 against clinical
S. aureus
isolates.
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Affiliation(s)
- Junwen Chen
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Bio-medical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, PR China
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen 518052, PR China
| | - Jinlian Chen
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Bio-medical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, PR China
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen 518052, PR China
| | - Zhanwen Wang
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Bio-medical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, PR China
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen 518052, PR China
| | - Chengchun Chen
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Bio-medical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, PR China
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen 518052, PR China
| | - Jinxin Zheng
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Bio-medical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, PR China
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen 518052, PR China
| | - Zhijian Yu
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Bio-medical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, PR China
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen 518052, PR China
| | - Qiwen Deng
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Bio-medical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, PR China
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen 518052, PR China
| | - Yuxi Zhao
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Bio-medical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, PR China
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen 518052, PR China
| | - Zewen Wen
- Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Huazhong University of Science and Technology Union Shenzhen Hospital, Shenzhen 518052, PR China
- Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Bio-medical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, PR China
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25
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Wu Z, Chan B, Low J, Chu JJH, Hey HWD, Tay A. Microbial resistance to nanotechnologies: An important but understudied consideration using antimicrobial nanotechnologies in orthopaedic implants. Bioact Mater 2022; 16:249-270. [PMID: 35415290 PMCID: PMC8965851 DOI: 10.1016/j.bioactmat.2022.02.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 02/10/2022] [Accepted: 02/11/2022] [Indexed: 12/11/2022] Open
Abstract
Microbial resistance to current antibiotics therapies is a major cause of implant failure and adverse clinical outcomes in orthopaedic surgery. Recent developments in advanced antimicrobial nanotechnologies provide numerous opportunities to effective remove resistant bacteria and prevent resistance from occurring through unique mechanisms. With tunable physicochemical properties, nanomaterials can be designed to be bactericidal, antifouling, immunomodulating, and capable of delivering antibacterial compounds to the infection region with spatiotemporal accuracy. Despite its substantial advancement, an important, but under-explored area, is potential microbial resistance to nanomaterials and how this can impact the clinical use of antimicrobial nanotechnologies. This review aims to provide a better understanding of nanomaterial-associated microbial resistance to accelerate bench-to-bedside translations of emerging nanotechnologies for effective control of implant associated infections.
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Affiliation(s)
- Zhuoran Wu
- Institute of Health Innovation & Technology, National University of Singapore, 117599, Singapore
| | - Brian Chan
- Department of Biomedical Engineering, National University of Singapore, 117583, Singapore
| | - Jessalyn Low
- Department of Biomedical Engineering, National University of Singapore, 117583, Singapore
| | - Justin Jang Hann Chu
- Biosafety Level 3 Core Facility, Yong Loo Lin School of Medicine, National University of Singapore, 117599, Singapore
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, 117545, Singapore
- Infectious Disease Programme, Yong Loo Lin School of Medicine, National University of Singapore, 117547, Singapore
- Institute of Molecular and Cell Biology, 35 Agency for Science, Technology and Research, 138673, Singapore
| | - Hwee Weng Dennis Hey
- National University Health System, National University of Singapore, 119228, Singapore
| | - Andy Tay
- Institute of Health Innovation & Technology, National University of Singapore, 117599, Singapore
- Department of Biomedical Engineering, National University of Singapore, 117583, Singapore
- Tissue Engineering Programme, National University of Singapore, 117510, Singapore
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26
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Ma M, Tao L, Li X, Liang Y, Li J, Wang H, Jiang H, Dong J, Han D, Du T. Changes in molecular characteristics and antimicrobial resistance of invasive Staphylococcus aureus infection strains isolated from children in Kunming, China during the COVID-19 epidemic. Front Microbiol 2022; 13:944078. [PMID: 36033878 PMCID: PMC9403864 DOI: 10.3389/fmicb.2022.944078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Accepted: 07/27/2022] [Indexed: 11/23/2022] Open
Abstract
Invasive Staphylococcus aureus (S. aureus) infection is associated with high rates of mortality in children. No studies have been reported on invasive S. aureus infection among children in Kunming, China, and it remains unknown whether the COVID-19 epidemic has affected S. aureus prevalence in this region. Thus, this study investigated the changes in molecular characteristics and antimicrobial resistance of invasive S. aureus strains isolated from children in Kunming during 2019–2021. In total, 66 invasive S. aureus strains isolated from children were typed by multilocus sequence typing (MLST), spa, and Staphylococcal cassette chromosome mec (SCCmec), and antimicrobial resistance and virulence genes were analyzed. A total of 19 ST types, 31 spa types and 3 SCCmec types were identified. Thirty nine (59.09%) strains were methicillin-sensitive S. aureus (MSSA) and 27 (40.91%) strains were methicillin-resistant S. aureus (MRSA). The most common molecular type was ST22-t309 (22.73%, 15/66), followed by ST59-t437 (13.64%, 9/66). In 2019 and 2021, the dominant molecular type was ST22-t309, while in 2020, it was ST59-t437. After 2019, the dominant molecular type of MRSA changed from ST338-t437 to ST59-t437. All strains were susceptible to tigecycline, ciprofloxacin, moxifloxacin, vancomycin, quinopudine-dafoputin, linezolid, levofloxacin, and rifampicin. From 2019 to 2021, the resistance to penicillin and sulfamethoxazole initially decreased and then increased, a trend that contrasted with the observed resistance to oxacillin, cefoxitin, erythromycin, clindamycin, and tetracycline. Sixteen antimicrobial resistance profiles were identified, with penicillin-tetracycline-erythromycin-clindamycin-oxacillin-cefoxitin being the most common, and the antimicrobial resistance profiles varied by year. The carrier rates of virulence genes, icaA, icaD, hla, fnbA, fnbB, clfA, clfB, and cna were 100.00%. Furthermore, sak, pvl, icaC, icaR, fib, lip, hlb, hysA, sea, seb, and tsst-1 had carrier rates of 96.97, 92.42, 87.88, 69.70, 84.85, 62.12, 56.06, 50, 37.87, 30.30, and 7.58%, respectively. Since COVID-19 epidemic, the annual number of invasive S. aureus strains isolated from children in Kunming remained stable, but the molecular characteristics and antimicrobial resistance profiles of prevalent S. aureus strains have changed significantly. Thus, COVID-19 prevention and control should be supplemented by surveillance of common clinical pathogens, particularly vigilance against the prevalence of multidrug-resistant and high-virulence strains.
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Affiliation(s)
- Mingbiao Ma
- Department of Clinical Laboratory, Kunming Children’s Hospital, Kunming, China
- Yunnan Key Laboratory of Children’s Major Disease Research, Kunming Children’s Hospital, Kunming, China
- Yunnan Province Clinical Research Center for Children’s Health and Disease, Kunming Children’s Hospital, Kunming, China
| | - Lvyan Tao
- Yunnan Key Laboratory of Children’s Major Disease Research, Kunming Children’s Hospital, Kunming, China
- Yunnan Province Clinical Research Center for Children’s Health and Disease, Kunming Children’s Hospital, Kunming, China
- Yunnan Institute of Pediatrics, Kunming Children’s Hospital, Kunming, China
| | - Xinyue Li
- Department of Clinical Laboratory, Kunming Children’s Hospital, Kunming, China
| | - Yanqi Liang
- Department of Laboratory, Chuxiong Higher College of Medicine, Chuxiong, China
| | - Jue Li
- Department of Clinical Laboratory, Kunming Children’s Hospital, Kunming, China
| | - Haiping Wang
- Department of Clinical Laboratory, Kunming Children’s Hospital, Kunming, China
| | - Hongchao Jiang
- Yunnan Key Laboratory of Children’s Major Disease Research, Kunming Children’s Hospital, Kunming, China
- Yunnan Province Clinical Research Center for Children’s Health and Disease, Kunming Children’s Hospital, Kunming, China
- Yunnan Institute of Pediatrics, Kunming Children’s Hospital, Kunming, China
| | - Jing Dong
- Department of Clinical Laboratory, Kunming Children’s Hospital, Kunming, China
| | - Dingrui Han
- Department of Clinical Laboratory, Kunming Children’s Hospital, Kunming, China
| | - Tingyi Du
- Department of Clinical Laboratory, Kunming Children’s Hospital, Kunming, China
- Yunnan Key Laboratory of Children’s Major Disease Research, Kunming Children’s Hospital, Kunming, China
- Yunnan Province Clinical Research Center for Children’s Health and Disease, Kunming Children’s Hospital, Kunming, China
- *Correspondence: Tingyi Du,
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27
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Brignoli T, Recker M, Lee WWY, Dong T, Bhamber R, Albur M, Williams P, Dowsey AW, Massey RC. Diagnostic MALDI-TOF MS can differentiate between high and low toxic Staphylococcus aureus bacteraemia isolates as a predictor of patient outcome. MICROBIOLOGY (READING, ENGLAND) 2022; 168. [PMID: 35997594 DOI: 10.1099/mic.0.001223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Staphylococcus aureus bacteraemia (SAB) is a major cause of blood-stream infection (BSI) in both healthcare and community settings. While the underlying comorbidities of a patient significantly contributes to their susceptibility to and outcome following SAB, recent studies show the importance of the level of cytolytic toxin production by the infecting bacterium. In this study we demonstrate that this cytotoxicity can be determined directly from the diagnostic MALDI-TOF mass spectrum generated in a routine diagnostic laboratory. With further development this information could be used to guide the management and improve the outcomes for SAB patients.
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Affiliation(s)
- Tarcisio Brignoli
- School of Cellular and Molecular Medicine, University of Bristol, Bristol, BS8 1TD, UK
| | - Mario Recker
- Centre for Ecology and Conservation, University of Exeter, Penryn, TR10 9FE, UK
- Institute of Tropical Medicine, University of Tübingen, Tübingen, Germany
| | - Winnie W Y Lee
- School of Cellular and Molecular Medicine, University of Bristol, Bristol, BS8 1TD, UK
| | - Tim Dong
- Department of Population Health Sciences and Bristol Veterinary School, University of Bristol, Bristol, BS8 2BN, UK
| | - Ranjeet Bhamber
- Department of Population Health Sciences and Bristol Veterinary School, University of Bristol, Bristol, BS8 2BN, UK
| | | | - Philip Williams
- UK Health Security Agency, and University Hospitals Bristol & Weston NHS Trust
| | - Andrew W Dowsey
- Department of Population Health Sciences and Bristol Veterinary School, University of Bristol, Bristol, BS8 2BN, UK
| | - Ruth C Massey
- School of Cellular and Molecular Medicine, University of Bristol, Bristol, BS8 1TD, UK
- Schools of Microbiology and Medicine and APC Microbiome Ireland, UCC, Cork, Ireland
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Berry KA, Verhoef MTA, Leonard AC, Cox G. Staphylococcus aureus adhesion to the host. Ann N Y Acad Sci 2022; 1515:75-96. [PMID: 35705378 DOI: 10.1111/nyas.14807] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Staphylococcus aureus is a pathobiont capable of colonizing and infecting most tissues within the human body, resulting in a multitude of different clinical outcomes. Adhesion of S. aureus to the host is crucial for both host colonization and the establishment of infections. Underlying the pathogen's success is a complex and diverse arsenal of adhesins. In this review, we discuss the different classes of adhesins, including a consideration of the various adhesion sites throughout the body and the clinical outcomes of each infection type. The development of therapeutics targeting the S. aureus host-pathogen interaction is a relatively understudied area. Due to the increasing global threat of antimicrobial resistance, it is crucial that innovative and alternative approaches are considered. Neutralizing virulence factors, through the development of antivirulence agents, could reduce bacterial pathogenicity and the ever-increasing burden of S. aureus infections. This review provides insight into potentially efficacious adhesion-associated targets for the development of novel decolonizing and antivirulence strategies.
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Affiliation(s)
- Kirsten A Berry
- Department of Molecular and Cellular Biology, College of Biological Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Mackenzie T A Verhoef
- Department of Molecular and Cellular Biology, College of Biological Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Allison C Leonard
- Department of Molecular and Cellular Biology, College of Biological Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Georgina Cox
- Department of Molecular and Cellular Biology, College of Biological Sciences, University of Guelph, Guelph, Ontario, Canada
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Ji J, Zhang S, Yuan M, Zhang M, Tang L, Wang P, Liu Y, Xu C, Luo P, Gao X. Fermented Rosa Roxburghii Tratt Juice Alleviates High-Fat Diet-Induced Hyperlipidemia in Rats by Modulating Gut Microbiota and Metabolites. Front Pharmacol 2022; 13:883629. [PMID: 35668952 PMCID: PMC9164371 DOI: 10.3389/fphar.2022.883629] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 04/19/2022] [Indexed: 12/03/2022] Open
Abstract
Hyperlipidemia endangers human health and has become a significant public health problem. This study aimed to investigate the mechanism of the hypolipidemic effects of Fermented Rosa roxburghii Tratt juice (FRRT) on hyperlipidemic rats and a new hypolipidemic intervention strategy was disclosed. The study revealed 12 weeks FRRT treatment significantly decreased the body weight, total cholesterol (TC), triacylglycerol (TG), low-density lipoprotein cholesterol (LDL-c), while high-density lipoprotein cholesterol (HDL-c) increased. We integrated the 16S rDNA sequencing and metabolomic profiling to evaluate the changes in the gut microbiota and metabolites. Significant changes in microbial composition accompanied marked changes in 56 feces metabolites. The results showed that FRRT could decrease the ratio of Firmicutes to Bacteroidetes, while increase the abundance of some bacterial genera (Prevotella, Paraprevotellaceae_Prevotella, Ruminococcus, Oscillospira). Metabolomics analysis displayed that the metabolisms of bile acid, amino acid and lipid were significantly affected by FRRT. Correlation analysis suggest that the reductions in serum lipids by FRRT are associated with the gut microbial community and their associated metabolites (amino acid metabolites, bile acid metabolites, and lipid metabolites). This study confirmed FRRT could be used as a new dietary and therapeutic strategy to dyslipidemia by improving the gut microbiota dysbiosis, metabolomic disorders and regulating the dyslipidemia. Our study also extended the understanding of the relationship between gut microbiota, metabolites, and lipid-lowering functions.
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Affiliation(s)
- Jiacheng Ji
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmacy, Guizhou Medical University, Guiyang, China.,Microbiology and Biochemical Pharmaceutical Engineering Research Center of Guizhou Provincial Department of Education, Guizhou Medical University, Guiyang, China
| | - Shuo Zhang
- Experimental Animal Center of Guizhou Medical University, Guiyang, China
| | - Minyan Yuan
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmacy, Guizhou Medical University, Guiyang, China.,Microbiology and Biochemical Pharmaceutical Engineering Research Center of Guizhou Provincial Department of Education, Guizhou Medical University, Guiyang, China
| | - Min Zhang
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmacy, Guizhou Medical University, Guiyang, China
| | - Li Tang
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmacy, Guizhou Medical University, Guiyang, China.,Microbiology and Biochemical Pharmaceutical Engineering Research Center of Guizhou Provincial Department of Education, Guizhou Medical University, Guiyang, China
| | - Pengjiao Wang
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmacy, Guizhou Medical University, Guiyang, China
| | - Yujie Liu
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmacy, Guizhou Medical University, Guiyang, China.,Microbiology and Biochemical Pharmaceutical Engineering Research Center of Guizhou Provincial Department of Education, Guizhou Medical University, Guiyang, China
| | - Changqian Xu
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmacy, Guizhou Medical University, Guiyang, China.,Microbiology and Biochemical Pharmaceutical Engineering Research Center of Guizhou Provincial Department of Education, Guizhou Medical University, Guiyang, China
| | - Peng Luo
- Guizhou Provincial Engineering Research Center of Food Nutrition and Health, Guizhou Medical University, Guiyang, China
| | - Xiuli Gao
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmacy, Guizhou Medical University, Guiyang, China.,Microbiology and Biochemical Pharmaceutical Engineering Research Center of Guizhou Provincial Department of Education, Guizhou Medical University, Guiyang, China.,Guizhou Provincial Engineering Research Center of Food Nutrition and Health, Guizhou Medical University, Guiyang, China
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30
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Neutralizing Staphylococcus aureus Virulence with AZD6389, a Three mAb Combination, Accelerates Closure of a Diabetic Polymicrobial Wound. mSphere 2022; 7:e0013022. [PMID: 35642538 PMCID: PMC9241520 DOI: 10.1128/msphere.00130-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Nonhealing diabetic foot ulcers (DFU), a major complication of diabetes, are associated with high morbidity and mortality despite current standard of care. Since Staphylococcus aureus is the most common pathogen isolated from nonhealing and infected DFU, we hypothesized that S. aureus virulence factors would damage tissue, promote immune evasion and alter the microbiome, leading to bacterial persistence and delayed wound healing. In a diabetic mouse polymicrobial wound model with S. aureus, Pseudomonas aeruginosa, and Streptococcus pyogenes, we report a rapid bacterial proliferation, prolonged pro-inflammatory response and large necrotic lesions unclosed for up to 40 days. Treatment with AZD6389, a three-monoclonal antibody combination targeting S. aureus alpha toxin, 4 secreted leukotoxins, and fibrinogen binding cell-surface adhesin clumping factor A resulted in full skin re-epithelization 21 days after inoculation. By neutralizing multiple virulence factors, AZD6389 effectively blocked bacterial agglutination and S. aureus-mediated cell killing, abrogated S. aureus-mediated immune evasion and targeted the bacteria for opsonophagocytic killing. Neutralizing S. aureus virulence not only facilitated S. aureus clearance in lesions, but also reduced S. pyogenes and P. aeruginosa numbers, damaging inflammatory mediators and markers for neutrophil extracellular trap formation 14 days post initiation. Collectively, our data suggest that AZD6389 holds promise as an immunotherapeutic approach against DFU complications. IMPORTANCE Diabetic foot ulcers (DFU) represent a major complication of diabetes and are associated with poor quality of life and increased morbidity and mortality despite standard of care. They have a complex pathogenesis starting with superficial skin lesions, which often progress to deeper tissue structures up to the bone and ultimately require limb amputation. The skin microbiome of diabetic patients has emerged as having an impact on DFU occurrence and chronicity. DFU are mostly polymicrobial, and the Gram-positive bacterium Staphylococcus aureus detected in more than 95% of cases. S. aureus possess a collection of virulence factors which participate in disease progression and may facilitate growth of other pathogens. Here we show in a diabetic mouse wound model that targeting some specific S. aureus virulence factors with a multimechanistic antibody combination accelerated wound closure and promoted full skin re-epithelization. This work opens promising new avenues for the treatment of DFU.
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Ong ZX, Kannan B, Becker DL. Exploiting transposons in the study of Staphylococcus aureus pathogenesis and virulence. Crit Rev Microbiol 2022; 49:297-317. [PMID: 35438613 DOI: 10.1080/1040841x.2022.2052794] [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: 11/03/2022]
Abstract
The opportunistic pathogen Staphylococcus aureus has an extremely complex relationship with humans. While the bacteria can exist as a commensal in many, it can cause a wide range of diseases and infections when turned pathogenic. Its presence is a determinant of chronicity and poor prognosis in numerous diseases, and its genomic plasticity causes S. aureus antimicrobial resistance to be one of the most dire contemporary medical problems to solve. Genetic manipulation of S. aureus has led to numerous findings that are vital in the fight against its pathogenesis. The utilisation of transposon mutant libraries for the systematic inspection of the S. aureus genome led to many landmark discoveries pertaining to the bacteria's pathogenicity, antimicrobial resistance acquisition, and virulence regulation. In this review, we describe mutant libraries, and their significant contributions, from various S. aureus strains created with commonly used transposons. The general workflow for the construction of libraries will be presented, along with a discussion of the challenges of undertaking the task of large-scale library construction. As the accessibility of transposon mutant library construction, screening, and analysis increases, this genetic tool could be further exploited in the study of the S. aureus genome.
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Affiliation(s)
- Zi Xin Ong
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore.,Skin Research Institute, Singapore.,Nanyang Institute of Technology in Health and Medicine, Interdisciplinary Graduate Programme, Nanyang Technological University, Singapore
| | - Bavani Kannan
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore.,Skin Research Institute, Singapore
| | - David L Becker
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore.,Skin Research Institute, Singapore
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32
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Pickens CI, Wunderink RG. Methicillin-Resistant Staphylococcus aureus Hospital-Acquired Pneumonia/Ventilator-Associated Pneumonia. Semin Respir Crit Care Med 2022; 43:304-309. [PMID: 35170002 PMCID: PMC10623688 DOI: 10.1055/s-0041-1740583] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a common cause of hospital-acquired pneumonia (HAP) and ventilator-associated pneumonia (VAP). MRSA pneumonia is associated with significant morbidity and mortality. Several virulence factors allow S. aureus to become an effective pathogen. The polysaccharide intracellular adhesin allows for the production of biofilms, some strains can produce capsular polysaccharides that protect against phagocytosis, microbial surface components recognizing adhesive matrix molecules (MSCRAMMs) allow for colonization of epithelial surfaces, and S. aureus secretes several exotoxins that aid in tissue destruction. The α-hemolysin exotoxin secreted by S. aureus is one of the most important virulence factors for the bacteria. The diagnosis of MRSA pneumonia can be challenging; the infection may present as a mild respiratory infection or severe respiratory failure and septic shock. Many individuals are colonized with MRSA and thus a positive nasopharyngeal swab does not confirm infection in the lower respiratory tract. The management of MRSA pneumonia has evolved. Historically, vancomycin has been the primary antibiotic used to treat MRSA pneumonia. Over the past decade, prospective studies have shown that linezolid leads to higher rates of clinical cure. Monoclonal antibodies are being studied as potential therapeutic options. MRSA is an important cause of HAP/VAP; novel diagnostics may facilitate rapid diagnosis of this infection and the available literature should be used to make informed decisions on management.
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Affiliation(s)
- Chiagozie I. Pickens
- Division of Critical Care, Department of Medicine, Pulmonary, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Richard G. Wunderink
- Division of Critical Care, Department of Medicine, Pulmonary, Northwestern University Feinberg School of Medicine, Chicago, Illinois
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33
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Immunoproteomic analysis of the secretome of bovine-adapted strains of Staphylococcus aureus demonstrates a strain-specific humoral response. Vet Immunol Immunopathol 2022; 249:110428. [DOI: 10.1016/j.vetimm.2022.110428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 04/03/2022] [Accepted: 04/13/2022] [Indexed: 11/21/2022]
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34
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Poh SE, Koh WL, Lim SYD, Wang EC, Yew YW, Common JE, Oon HH, Li H. Expression of Staphylococcus aureus virulence factors in atopic dermatitis. JID INNOVATIONS 2022; 2:100130. [PMID: 35860448 PMCID: PMC9289736 DOI: 10.1016/j.xjidi.2022.100130] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 03/23/2022] [Accepted: 03/28/2022] [Indexed: 11/29/2022] Open
Abstract
Atopic dermatitis (AD) is a skin inflammatory disease in which the opportunistic pathogen Staphylococcus aureus is prevalent and abundant. S. aureus harbors several secreted virulence factors that have well-studied functions in infection models, but it is unclear whether these extracellular microbial factors are relevant in the context of AD. To address this question, we designed a culture-independent method to detect and quantify S. aureus virulence factors expressed at the skin sites. We utilized RNase-H‒dependent multiplex PCR for preamplification of reverse-transcribed RNA extracted from tape strips of patients with AD sampled at skin sites with differing severity and assessed the expression of a panel of S. aureus virulence factors using qPCR. We observed an increase in viable S. aureus abundance on sites with increased severity of disease, and many virulence factors were expressed at the AD skin sites. Surprisingly, we did not observe any significant upregulation of the virulence factors at the lesional sites compared with those at the nonlesional control. Overall, we utilized a robust assay to directly detect and quantify viable S. aureus and its associated virulence factors at the site of AD skin lesions. This method can be extended to study the expression of skin microbial genes at the sites of various dermatological conditions.
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Affiliation(s)
- Si En Poh
- Molecular Engineering Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research, Singapore, Singapore
| | - Winston L.C. Koh
- Molecular Engineering Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research, Singapore, Singapore
| | - Shi Yu Derek Lim
- National Skin Centre, National Healthcare Group, Singapore, Singapore
| | - Etienne C.E. Wang
- National Skin Centre, National Healthcare Group, Singapore, Singapore
- Skin Research Institute of Singapore, Singapore
| | - Yik Weng Yew
- National Skin Centre, National Healthcare Group, Singapore, Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore
| | - John E.A. Common
- ASTAR Skin Research Labs (ASRL), Agency for Science, Technology and Research, Singapore, Singapore
| | - Hazel H. Oon
- National Skin Centre, National Healthcare Group, Singapore, Singapore
| | - Hao Li
- Molecular Engineering Lab, Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research, Singapore, Singapore
- Department of Chemistry, Faculty of Science, National University of Singapore, Singapore, Singapore
- Correspondence: Hao Li, Department of Chemistry, Faculty of Science, National University of Singapore, 4 Science Drive 2, S9 Level 12, Singapore 117544, Singapore.
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35
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Jahn K, Kohler TP, Swiatek LS, Wiebe S, Hammerschmidt S. Platelets, Bacterial Adhesins and the Pneumococcus. Cells 2022; 11:cells11071121. [PMID: 35406684 PMCID: PMC8997422 DOI: 10.3390/cells11071121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 03/22/2022] [Accepted: 03/22/2022] [Indexed: 01/25/2023] Open
Abstract
Systemic infections with pathogenic or facultative pathogenic bacteria are associated with activation and aggregation of platelets leading to thrombocytopenia and activation of the clotting system. Bacterial proteins leading to platelet activation and aggregation have been identified, and while platelet receptors are recognized, induced signal transduction cascades are still often unknown. In addition to proteinaceous adhesins, pathogenic bacteria such as Staphylococcus aureus and Streptococcus pneumoniae also produce toxins such as pneumolysin and alpha-hemolysin. They bind to cellular receptors or form pores, which can result in disturbance of physiological functions of platelets. Here, we discuss the bacteria-platelet interplay in the context of adhesin–receptor interactions and platelet-activating bacterial proteins, with a main emphasis on S. aureus and S. pneumoniae. More importantly, we summarize recent findings of how S. aureus toxins and the pore-forming toxin pneumolysin of S. pneumoniae interfere with platelet function. Finally, the relevance of platelet dysfunction due to killing by toxins and potential treatment interventions protecting platelets against cell death are summarized.
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36
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Leucine-Rich, Potent Anti-Bacterial Protein against Vibrio cholerae, Staphylococcus aureus from Solanum trilobatum Leaves. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27041167. [PMID: 35208951 PMCID: PMC8876335 DOI: 10.3390/molecules27041167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 01/31/2022] [Accepted: 02/07/2022] [Indexed: 11/17/2022]
Abstract
A 24 kDa leucine-rich protein from ion exchange fractions of Solanum trilobatum, which has anti-bacterial activity against both the Gram-negative Vibrio cholerae and Gram-positive Staphylococcus aureus bacteria has been purified. In this study, mass spectrometry analysis identified the leucine richness and found a luminal binding protein (LBP). Circular dichroism suggests that the protein was predominantly composed of α- helical contents of its secondary structure. Scanning electron microscopy visualized the characteristics and morphological and structural changes in LBP-treated bacterium. Further in vitro studies confirmed that mannose-, trehalose- and raffinose-treated LBP completely inhibited the hemagglutination ability towards rat red blood cells. Altogether, these studies suggest that LBP could bind to sugar moieties which are abundantly distributed on bacterial surface which are essential for maintaining the structural integrity of bacteria. Considering that Solanum triolbatum is a well-known medicinal and edible plant, in order to shed light on its ancient usage in this work, an efficient anti-microbial protein was isolated, characterized and its in vitro functional study against human pathogenic bacteria was evaluated.
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37
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Mohamed AF, Nasr M, Amer ME, Abuamara TMM, Abd-Elhay WM, Kaabo HF, Matar EER, El Moselhy LE, Gomah TA, Deban MAEF, Shebl RI. Anticancer and antibacterial potentials induced post short-term exposure to electromagnetic field and silver nanoparticles and related pathological and genetic alterations: in vitro study. Infect Agent Cancer 2022; 17:4. [PMID: 35120563 PMCID: PMC8817517 DOI: 10.1186/s13027-022-00416-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 01/14/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Resistance to antibiotics and anticancer therapy is a serious global health threat particularly in immunosuppressed cancer patients. Current study aimed to estimate the antibacterial and anticancer potentials of short-term exposure to extremely low frequency electromagnetic field (ELF-EMF) and silver nanoparticles (AgNPs) either in sole or combined form. METHODS Antibacterial activity was evaluated via determination of the bacterial viable count reduction percentage following exposure, whereas their ability to induce apoptosis in breast cancer (MCF-7) cell line was detected using annexin V-fluorescein isothiocyanate and cell cycle analysis. Also, oxidative stress potential and molecular profile were investigated. RESULTS ELF-EMF and AgNPs significantly (p < 0.01) reduced K. pneumonia viable count of compared to that of S. aureus in a time dependent manner till reaching 100% inhibition when ELF-EMF was applied in combination to 10 µM/ml AgNPs for 2 h. Apoptosis induction was obvious following exposure to either ELF-EMF or AgNPs, however their apoptotic potential was intensified when applied in combination recording significantly (p < 0.001) induced apoptosis as indicated by elevated level of MCF-7 cells in the Pre G1 phase compared to control. S phase arrest and accumulation of cells in G2/M phase was observed following exposure to AgNPs and EMF, respectively. Up-regulation in the expression level of p53, iNOS and NF-kB genes as well as down-regulation of Bcl-2 and miRNA-125b genes were detected post treatment. CONCLUSIONS The antibacterial and anticancer potentials of these agents might be related to their ability to induce oxidative stress, suggesting their potentials as novel candidates for controlling infections and triggering cancer cells towards self-destruction.
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Affiliation(s)
- Aly Fahmy Mohamed
- International Center for Training and Advanced Researches (ICTAR-Egypt), Cairo, Egypt
| | - Mohamed Nasr
- Histology Department, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
| | - Mohamed E Amer
- Histology Department, Faculty of Medicine, Al-Azhar University, Damietta, Egypt
| | - Tamer M M Abuamara
- Histology Department, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
| | - Wagih M Abd-Elhay
- Histology Department, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
| | - Hassan Fathy Kaabo
- Histology Department, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
| | - Emad Eldin R Matar
- Pathology Department, Faculty of Medicine, Al-Azhar University, Cairo, Egypt
| | - Laila E El Moselhy
- Histology Department, Faculty of Medicine, Al-Azhar University, Damietta, Egypt
| | | | | | - Rania Ibrahim Shebl
- Microbiology and Immunology Department, Faculty of Pharmacy, Ahram Canadian University (ACU), 4th Industrial Zone, Banks Complex, 6th October City, Cairo, Egypt.
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38
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Guo M, Yi T, Wang Q, Wang D, Feng P, Kesheng D, Chunyan H. TSST-1 protein exerts indirect effect on platelet activation and apoptosis. Platelets 2022; 33:998-1008. [PMID: 35073811 DOI: 10.1080/09537104.2022.2026907] [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: 10/19/2022]
Abstract
Thrombocytopenia or platelet dysfunction is a risk factor for severe infection. Staphylococcus aureus (S. aureus) releases a variety of virulence factors especially toxic shock syndrome toxin 1 (TSST-1), which may cause toxic shock syndrome. S. aureus, when carrying the tst gene, is more prone to cause toxic shock syndrome and is responsible for an especially high rate of mortality. However, the effect of TSST-1 protein on platelets is unknown. Patients with the tst gene positive S. aureus bacteremia showed more serious infection, higher mortality and lower platelet count. The tst gene positive S. aureus strains induce more platelet apoptosis and activation and corresponding up-regulation of Bak and down-regulation of Bcl-XL in addition to the activation of Caspase-3. C57BL/6 mice infected with the tst gene positive strains resulted in both a decrease in platelet count and an increase in platelet apoptosis and/or activation events and mortality. Moreover, TSST-1 protein, encoded by tst gene, caused the decrease of platelet count, the increase of platelet apoptosis and activation events and the level of inflammatory cytokines in vivo. However, TSST-1 protein was unable to induce traditional activation and apoptosis on human platelets in vitro. These results suggested that TSST-1 protein may exert indirect effects on platelet activation and apoptosis in vivo.
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Affiliation(s)
- Min Guo
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Tiantian Yi
- Department of Clinical Laboratory, Suzhou Wuzhong People's Hospital, Suzhou, China
| | - Qian Wang
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Daqing Wang
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Ping Feng
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Dai Kesheng
- Jiangsu Institute of Hematology, the First Affiliated Hospital and Collaborative Innovation Center of Hematology, Soochow University, Key Laboratory of Thrombosis and Hemostasis, Ministry of Health, Suzhou, China
| | - He Chunyan
- Department of Clinical Laboratory, The Second Affiliated Hospital of Soochow University, Suzhou, China
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Yang Z, Qiu B, Cheng D, Zhao N, Liu Y, Li M, Liu Q. Virulent Staphylococcus aureus Colonizes Pediatric Nares by Resisting Killing of Human Antimicrobial Peptides. Int J Med Microbiol 2022; 312:151550. [DOI: 10.1016/j.ijmm.2022.151550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 01/16/2022] [Accepted: 01/23/2022] [Indexed: 11/29/2022] Open
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40
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Identification of Novel Antistaphylococcal Hit Compounds Targeting Sortase A. Molecules 2021; 26:molecules26237095. [PMID: 34885677 PMCID: PMC8658998 DOI: 10.3390/molecules26237095] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 11/23/2021] [Accepted: 11/23/2021] [Indexed: 12/04/2022] Open
Abstract
Staphylococcus aureus (S. aureus) is a causative agent of many hospital- and community-acquired infections with the tendency to develop resistance to all known antibiotics. Therefore, the development of novel antistaphylococcal agents is of urgent need. Sortase A is considered a promising molecular target for the development of antistaphylococcal agents. The main aim of this study was to identify novel sortase A inhibitors. In order to find novel antistaphylococcal agents, we performed phenotypic screening of a library containing 15512 compounds against S. aureus ATCC43300. The molecular docking of hits was performed using the DOCK program and 10 compounds were selected for in vitro enzymatic activity inhibition assay. Two inhibitors were identified, N,N-diethyl-N′-(5-nitro-2-(quinazolin-2-yl)phenyl)propane-1,3-diamine (1) and acridin-9-yl-(1H-benzoimidazol-5-yl)-amine (2), which decrease sortase A activity with IC50 values of 160.3 µM and 207.01 µM, respectively. It was found that compounds 1 and 2 possess antibacterial activity toward 29 tested multidrug resistant S. aureus strains with MIC values ranging from 78.12 to 312.5 mg/L. These compounds can be used for further structural optimization and biological research.
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Anti- Staphylococcus aureus Single-Chain Fragment Variables Play a Protective Anti-Inflammatory Role In Vitro and In Vivo. Vaccines (Basel) 2021; 9:vaccines9111300. [PMID: 34835231 PMCID: PMC8618225 DOI: 10.3390/vaccines9111300] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/01/2021] [Accepted: 11/05/2021] [Indexed: 02/07/2023] Open
Abstract
Staphylococcus aureus is a causative agent of bovine mastitis, capable of causing significant economic losses to the dairy industry worldwide. This study focuses on obtaining single-chain fragment variables (scFvs) against the virulence factors of S. aureus and evaluates the protective effect of scFvs on bovine mammary epithelial (MAC-T) cells and mice mammary gland tissues infected by S. aureus. After five rounds of bio-panning, four scFvs targeting four virulence factors of S. aureus were obtained. The complementarity-determining regions (CDRs) of these scFvs exhibited significant diversities, especially CDR3 of the VH domain. In vitro, each of scFvs was capable of inhibiting S. aureus growth and reducing the damage of MAC-T cells infected by S. aureus. Preincubation of MAC-T cells with scFvs could significantly attenuate the effect of apoptosis and necrosis compared with the negative control group. In vivo, the qPCR and ELISA results demonstrated that scFvs reduced the transcription and expression of Tumor Necrosis Factor alpha (TNF-α), interleukin-1β (IL-1β), IL-6, IL-8, and IL-18. Histopathology and myeloperoxidase (MPO) results showed that scFvs ameliorated the histopathological damages and reduced the inflammatory cells infiltration. The overall results demonstrated the positive anti-inflammatory effect of scFvs, revealing the potential role of scFvs in the prevention and treatment of S. aureus infections.
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42
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He WP, Gu FF, Zhang J, Li XX, Xiao SZ, Zeng Q, Ni YX, Han LZ. Molecular characteristics and risk factor analysis of Staphylococcus aureus colonization put insight into CC1 colonization in three nursing homes in Shanghai. PLoS One 2021; 16:e0253858. [PMID: 34618818 PMCID: PMC8496869 DOI: 10.1371/journal.pone.0253858] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 06/14/2021] [Indexed: 11/19/2022] Open
Abstract
Research indicates that Staphylococcus aureus colonization in the elderly with predisposing risks is associated with subsequent infection. However, the molecular epidemiology and risk factors for S. aureus colonization among residents and staff in nursing homes (NHs) in China remain unclear. A multicenter study was conducted in three NHs in Shanghai between September 2019 and October 2019. We explored the prevalence, molecular epidemiology, and risk factors for S. aureus colonization. All S. aureus isolates were characterized based on antimicrobial resistance, virulence genes, multilocus sequence typing (MLST), staphylococcus protein A (spa) typing, and staphylococcal cassette chromosome mec (SCCmec) typing. NH records were examined for potential risk factors for S. aureus colonization. S. aureus and methicillin-resistant S. aureus (MRSA) isolates were detected in 109 (100 residents and 9 staff, 19.8%, 109/551) and 28 (24 residents and 4 staff, 5.1%, 28/551) subjects among 496 residents and 55 staff screened, respectively. Compared to methicillin-susceptible S. aureus isolates, all 30 MRSA isolates had higher resistance rates to most antibiotics except minocycline, rifampicin, linezolid, vancomycin, and teicoplanin. Sequence type (ST) 1 (21.3%) was the most common sequence type, and t127 (20.5%) was the most common spa type among 122 S. aureus isolates. SCCmec type I (70%) was the dominant clone among all MRSA isolates. CC1 (26/122, 21.3%) was the predominant complex clone (CC), followed by CC398 (25/122, 20.5%), CC5 (20/122, 16.4%) and CC188 (18/122, 14.8%). Female sex (OR, 1.70; 95% CI, 1.04-2.79; P = 0.036) and invasive devices (OR, 2.19; 95% CI, 1.26-3.81; P = 0.006) were independently associated with S. aureus colonization.
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Affiliation(s)
- Wei-Ping He
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Clinical Microbiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Fei-Fei Gu
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Clinical Microbiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ji Zhang
- Department of Clinical Laboratory, Shanghai People’s Hospital of Putuo District, Shanghai, China
| | - Xin-Xin Li
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Clinical Microbiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shu-Zhen Xiao
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Clinical Microbiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Qian Zeng
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Clinical Microbiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yu-Xing Ni
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Clinical Microbiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Li-Zhong Han
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Clinical Microbiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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43
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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.
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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
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44
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Pizauro LJL, de Almeida CC, Silva SR, MacInnes JI, Kropinski AM, Zafalon LF, de Avila FA, de Mello Varani A. Genomic comparisons and phylogenetic analysis of mastitis-related staphylococci with a focus on adhesion, biofilm, and related regulatory genes. Sci Rep 2021; 11:17392. [PMID: 34462461 PMCID: PMC8405628 DOI: 10.1038/s41598-021-96842-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Accepted: 08/10/2021] [Indexed: 02/07/2023] Open
Abstract
Mastitis is a common and costly disease on dairy farms, commonly caused by Staphylococcus spp. though the various species are associated with different clinical outcomes. In the current study, we performed genomic analyses to determine the prevalence of adhesion, biofilm, and related regulatory genes in 478 staphylococcal species isolated from clinical and subclinical mastitis cases deposited in public databases. The most prevalent adhesin genes (ebpS, atl, pls, sasH and sasF) were found in both clinical and subclinical isolates. However, the ebpS gene was absent in subclinical isolates of Staphylococcus arlettae, S. succinus, S. sciuri, S. equorun, S. galinarum, and S. saprophyticus. In contrast, the coa, eap, emp, efb, and vWbp genes were present more frequently in clinical (vs. subclincal) mastitis isolates and were highly correlated with the presence of the biofim operon (icaABCD) and its transcriptional regulator, icaR. Co-phylogenetic analyses suggested that many of these adhesins, biofilm, and associated regulatory genes could have been horizontally disseminated between clinical and subclinical isolates. Our results further suggest that several adhesins, biofilm, and related regulatory genes, which have been overlooked in previous studies, may be of use for virulence profiling of mastitis-related Staphylococcus strains or as potential targets for vaccine development.
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Affiliation(s)
- Lucas José Luduverio Pizauro
- grid.410543.70000 0001 2188 478XDepartment of Technology, Sao Paulo State University, Jaboticabal, Sao Paulo Brazil
| | - Camila Chioda de Almeida
- grid.410543.70000 0001 2188 478XDepartment of Microbiology, Sao Paulo State University, Jaboticabal, Sao Paulo Brazil
| | - Saura Rodrigues Silva
- grid.410543.70000 0001 2188 478XDepartment of Technology, Sao Paulo State University, Jaboticabal, Sao Paulo Brazil
| | - Janet I. MacInnes
- grid.34429.380000 0004 1936 8198Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON Canada
| | - Andrew M. Kropinski
- grid.34429.380000 0004 1936 8198Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON Canada
| | - Luiz Francisco Zafalon
- grid.460200.00000 0004 0541 873XBrazilian Agricultural Research Corporation (EMBRAPA), Embrapa Southeast Livestock, Sao Carlos, Sao Paulo Brazil
| | - Fernando Antônio de Avila
- grid.410543.70000 0001 2188 478XDepartment of Microbiology, Sao Paulo State University, Jaboticabal, Sao Paulo Brazil
| | - Alessandro de Mello Varani
- grid.410543.70000 0001 2188 478XDepartment of Technology, Sao Paulo State University, Jaboticabal, Sao Paulo Brazil
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45
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Wang L, Jing S, Qu H, Wang K, Jin Y, Ding Y, Yang L, Yu H, Shi Y, Li Q, Wang D. Orientin mediates protection against MRSA-induced pneumonia by inhibiting Sortase A. Virulence 2021; 12:2149-2161. [PMID: 34369293 PMCID: PMC8354611 DOI: 10.1080/21505594.2021.1962138] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Drug-resistant pathogenic Staphylococcus aureus (S. aureus) has severely threatened human health and arouses widespread concern. Sortase A (SrtA) is an essential virulence factor of S. aureus, which is responsible for the covalent anchoring of a variety of virulence-related proteins to the cell wall. SrtA has always been regarded as an ideal pharmacological target against S. aureus infections. In this research, we have determined that orientin, a natural compound isolated from various medicinal plants, can effectively inhibit the activity of SrtA with an IC50 of 50.44 ± 0.51 µM. We further demonstrated that orientin inhibited the binding of S. aureus to fibrinogen and diminished biofilm formation and the attaching of Staphylococcal protein A (SpA) to the cell wall in vitro. Using the fluorescence quenching assay, we demonstrated a direct interaction between orientin and SrtA. Further mechanistic studies revealed that the residues Glu-105, Thr-93, and Cys-184 were the key sites for the binding of SrtA to orientin. Importantly, we demonstrated that treatment with orientin attenuated S. aureus virulence of in vivo and protected mice against S. aureus-induced lethal pneumonia. These findings indicate that orientin is a potential drug to counter S. aureus infections and limit the development of drug resistance.
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Affiliation(s)
- Li Wang
- College of Animal Science, Jilin University, Changchun China
| | - Shisong Jing
- College of Animal Science, Jilin University, Changchun China
| | - Han Qu
- Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Kai Wang
- Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Yajing Jin
- College of Animal Science, Jilin University, Changchun China
| | - Ying Ding
- College of Animal Science, Jilin University, Changchun China
| | - Lin Yang
- College of Animal Science, Jilin University, Changchun China
| | - Hangqian Yu
- College of Animal Science, Jilin University, Changchun China
| | - Yan Shi
- School of Pharmaceutical Science, Jilin University, Changchun China
| | - Qianxue Li
- Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Dacheng Wang
- College of Animal Science, Jilin University, Changchun China
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46
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Le Masters T, Johnson S, Jeraldo PR, Greenwood-Quaintance KE, Cunningham SA, Abdel MP, Chia N, Patel R. Comparative Transcriptomic Analysis of Staphylococcus aureus Associated with Periprosthetic Joint Infection under in Vivo and in Vitro Conditions. J Mol Diagn 2021; 23:986-999. [PMID: 34098085 PMCID: PMC8351120 DOI: 10.1016/j.jmoldx.2021.05.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 02/25/2021] [Accepted: 05/06/2021] [Indexed: 11/15/2022] Open
Abstract
Transcriptomic analysis can provide insight as to how Staphylococcus aureus adapts to the environmental niche of periprosthetic joint infection (PJI), a challenging clinical infection. Here, in vivo RNA expression of eight S. aureus PJIs was compared with expression of the corresponding isolates in planktonic culture using a total RNA-sequencing approach. Expression varied among isolates, with a common trend showing increased expression of several ica-independent biofilm formation genes, including sdr, fnb, ebpS, and aaa; genes encoding enzymes and toxins, including coa, nuc, hlb, and hlgA/B/C; and genes facilitating acquisition of iron via the iron-binding molecule siderophore B (snb) and heme consumption protein (isd) pathways in PJI. Several antimicrobial resistance determinants were detected; although their presence correlated with phenotypic susceptibility of the associated isolates, no difference in expression between in vivo and in vitro conditions was identified.
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Affiliation(s)
- Thao Le Masters
- Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Stephen Johnson
- Center for Individualized Medicine, Mayo Clinic, Rochester, Minnesota
| | - Patricio R Jeraldo
- Center for Individualized Medicine, Mayo Clinic, Rochester, Minnesota; Department of Surgery, Mayo Clinic, Rochester, Minnesota
| | - Kerryl E Greenwood-Quaintance
- Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Scott A Cunningham
- Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Matthew P Abdel
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota
| | - Nicholas Chia
- Center for Individualized Medicine, Mayo Clinic, Rochester, Minnesota; Department of Surgery, Mayo Clinic, Rochester, Minnesota
| | - Robin Patel
- Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota; Division of Infectious Diseases, Department of Medicine, Mayo Clinic, Rochester, Minnesota.
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47
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Human Urine Alters Methicillin-Resistant Staphylococcus aureus Virulence and Transcriptome. Appl Environ Microbiol 2021; 87:e0074421. [PMID: 34105987 DOI: 10.1128/aem.00744-21] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Gram-positive methicillin-resistant Staphylococcus aureus (MRSA) is an emerging cause of hospital-associated urinary tract infections (UTI), especially in catheterized individuals. Despite being rare, MRSA UTI are prone to potentially life-threatening exacerbations such as bacteremia that can be refractory to routine antibiotic therapy. To delineate the molecular mechanisms governing MRSA urinary pathogenesis, we exposed three S. aureus clinical isolates, including two MRSA strains, to human urine for 2 h and analyzed virulence characteristics and changes in gene expression. The in vitro virulence assays showed that human urine rapidly alters adherence to human bladder epithelial cells and fibronectin, hemolysis of sheep red blood cells (RBCs), and surface hydrophobicity in a staphylococcal strain-specific manner. In addition, transcriptome sequencing (RNA-Seq) analysis of uropathogenic strain MRSA-1369 revealed that 2-h-long exposure to human urine alters MRSA transcriptome by modifying expression of genes encoding enzymes catalyzing metabolic pathways, virulence factors, and transcriptional regulators. In summary, our results provide important insights into how human urine specifically and rapidly alters MRSA physiology and facilitates MRSA survival in the nutrient-limiting and hostile urinary microenvironment. IMPORTANCE Methicillin-resistant Staphylococcus aureus (MRSA) is an uncommon cause of urinary tract infections (UTI) in the general population. However, it is important to understand MRSA pathophysiology in the urinary tract because isolation of MRSA in urine samples often precedes potentially life-threatening MRSA bacteremia. In this report, we describe how exposure to human urine alters MRSA global gene expression and virulence. We hypothesize that these alterations may aid MRSA in acclimating to the nutrient-limiting, immunologically hostile conditions within the urinary tract leading to MRSA UTI.
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48
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Ma M, Chu M, Tao L, Li J, Li X, Huang H, Qu K, Wang H, Li L, Du T. First Report of Oxacillin Susceptible mecA-Positive Staphylococcus aureus in a Children's Hospital in Kunming, China. Infect Drug Resist 2021; 14:2597-2606. [PMID: 34262304 PMCID: PMC8275014 DOI: 10.2147/idr.s317670] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 06/25/2021] [Indexed: 11/23/2022] Open
Abstract
Purpose The present study investigated the prevalence characteristics of oxacillin susceptible mecA-positive Staphylococcus aureus (OS-MRSA) in a children's hospital in Kunming from January 2019 to December 2020. Methods A total of 499 S. aureus strains were included in the study and tested for oxacillin susceptibility using the VITEK 2 Compact automated antimicrobial susceptibility test system. All oxacillin-susceptible strains were detected mecA and mecC by polymerase chain reaction (PCR). E-test was used to compare the minimum inhibitory concentration (MIC) values of methicillin-susceptible S. aureus (MSSA), methicillin-resistant S. aureus (MRSA), and OS-MRSA for oxacillin, cefoxitin, penicillin, vancomycin, erythromycin, and clindamycin. Molecular typing of OS-MRSA was performed by MLST and SCCmec typing. Toxin genes were detected by PCR. Results Forty-five OS-MRSA strains were detected, for an overall rate of 9.02% (45/499). The MICs of MSSA, OS-MRSA, and MRSA against oxacillin were concentrated at 0.38, 0.38, and 12 μg/mL, respectively; the cefoxitin MICs of MSSA and MRSA were concentrated at 2 and 32 μg/mL respectively; and MICs of OS-MRSA were concentrated at 2 and 8 μg/mL; penicillin, vancomycin and erythromycin MICs against MSSA, OS-MRSA, and MRSA showed same centralized points and were 32, 1, and 256 μg/mL, respectively; the MICs of clindamycin against MSSA were 0.5 μg/mL, while that against OS-MRSA and MRSA were concentrated at 256 μg/mL. Molecular typing of OS-MRSA was dominated by ST59-SCCmec IV. The carrier rates of hemolysin genes (hl-a, hl-d) and fibrinogen-binding clumping factor genes (clfA, clfB) were 100% in OS-MRSA, followed by 40% (18/45) for enterotoxin genes (sea, seb). Conclusion OS-MRSA has a high detection rate in children, and main molecular typing is ST59-SCCmecIV in Kunming. The identification ability of automated antibacterial drug sensitivity test detection systems for OS-MRSA is very limited. A combination of phenotypic analysis and molecular detection should be used to improve OS-MRSA identification.
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Affiliation(s)
- Mingbiao Ma
- Department of Clinical Laboratory, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Department of Clinical Laboratory, Children's Hospital Affiliated to Kunming Medical University, Kunming, Yunnan, People's Republic of China.,Yunnan Key Laboratory of Children's Major Disease Research, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China
| | - Minjun Chu
- Department of Clinical Laboratory, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Department of Clinical Laboratory, Children's Hospital Affiliated to Kunming Medical University, Kunming, Yunnan, People's Republic of China
| | - Lvyan Tao
- Yunnan Key Laboratory of Children's Major Disease Research, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Yunnan Institute of Pediatrics, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Kunming Key Laboratory of Children Infection and Immunity, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China
| | - Jue Li
- Department of Clinical Laboratory, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Department of Clinical Laboratory, Children's Hospital Affiliated to Kunming Medical University, Kunming, Yunnan, People's Republic of China
| | - Xiaojuan Li
- Department of Clinical Laboratory, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Department of Clinical Laboratory, Children's Hospital Affiliated to Kunming Medical University, Kunming, Yunnan, People's Republic of China
| | - Hailin Huang
- Department of Clinical Laboratory, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Department of Clinical Laboratory, Children's Hospital Affiliated to Kunming Medical University, Kunming, Yunnan, People's Republic of China
| | - Kexuan Qu
- Department of Blood Transfusion, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China
| | - Haiping Wang
- Department of Clinical Laboratory, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Department of Clinical Laboratory, Children's Hospital Affiliated to Kunming Medical University, Kunming, Yunnan, People's Republic of China
| | - Li Li
- Yunnan Key Laboratory of Children's Major Disease Research, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Yunnan Institute of Pediatrics, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Kunming Key Laboratory of Children Infection and Immunity, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China
| | - Tingyi Du
- Department of Clinical Laboratory, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China.,Department of Clinical Laboratory, Children's Hospital Affiliated to Kunming Medical University, Kunming, Yunnan, People's Republic of China.,Yunnan Key Laboratory of Children's Major Disease Research, Kunming Children's Hospital, Kunming, Yunnan, People's Republic of China
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Abstract
Staphylococcus aureus is both a commensal and a pathogenic bacterium for humans. Its ability to induce severe infections is based on a wide range of virulence factors. S. aureus community-acquired pneumonia (SA-CAP) is rare and severe, and the contribution of certain virulence factors in this disease has been recognized over the past 2 decades. First, the factors involved in metabolism adaptation are crucial for S. aureus survival in the lower respiratory tract, and toxins and enzymes are required for it to cross the pulmonary epithelial barrier. S. aureus subsequently faces host defense mechanisms, including the epithelial barrier, but most importantly the immune system. Here, again, S. aureus uses myriad virulence factors to successfully escape from the host's defenses and takes advantage of them. The impact of S. aureus virulence, combined with the collateral damage caused by an overwhelming immune response, leads to severe tissue damage and adverse clinical outcomes. In this review, we summarize step by step all of the S. aureus factors implicated in CAP and described to date, and we provide an outlook for future research.
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Affiliation(s)
- Mariane Pivard
- CIRI, Centre International de Recherche en Infectiologie, Université de Lyon, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de Lyon, Lyon, France
| | - Karen Moreau
- CIRI, Centre International de Recherche en Infectiologie, Université de Lyon, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de Lyon, Lyon, France
| | - François Vandenesch
- CIRI, Centre International de Recherche en Infectiologie, Université de Lyon, Inserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de Lyon, Lyon, France
- Centre National de Référence des Staphylocoques, Institut des agents infectieux, Hospices Civils de Lyon, Lyon, France
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50
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Zhou K, Sun F, Xu XL, Hao XK, Liu JY. Prevalences and characteristics of cultivable nasal bacteria isolated from preclinical medical students. J Int Med Res 2021; 48:300060520961716. [PMID: 33103543 PMCID: PMC7607144 DOI: 10.1177/0300060520961716] [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: 01/13/2023] Open
Abstract
OBJECTIVES Commensal bacteria in the nasal cavity may act as opportunistic pathogens that cause infections under certain conditions. Screening for commensal bacteria in the nasal cavity may aid in understanding their roles in microbiota balance and preventing potential infections. METHODS Nasal samples were collected from healthy preclinical medical students and used to inoculate various bacterial culture media, by means of the WaspLab microbiology automated system. Bacterial colonies were then identified by matrix-assisted laser desorption ionization-time of flight mass spectrometry. Antibiotic resistance phenotypes of Staphylococcus aureus were determined by antibiotic susceptibility tests. RESULTS In total, 549 bacterial strains were isolated from 161 participants. These strains included the following genera: Staphylococcus, Streptococcus, Corynebacterium, Dolosigranulum, Bacillus, Micrococcus, Haemophilus, Neisseria, Moraxella, Pseudomonas, and members of Enterobacteriaceae (e.g., Escherichia, Klebsiella, Citrobacter, Enterobacter, and Serratia). Approximately 25.5% of students were carriers of S. aureus; most S. aureus isolates were resistant to penicillin, erythromycin, and clindamycin. The prevalence of methicillin-resistant S. aureus in nasal samples was 4.3%. CONCLUSIONS A diverse group of nasal commensal bacteria inhabited our population of healthy volunteers. These data can improve comprehension of the potential roles of these nasal commensal bacteria in regulating microbiota balance and promoting or mitigating potential future infections.
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Affiliation(s)
- Ke Zhou
- Center of Clinical Laboratory Medicine of PLA, Department of Laboratory Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Fei Sun
- Department of Otolaryngology Head and Neck Surgery, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Xiu-Li Xu
- Center of Clinical Laboratory Medicine of PLA, Department of Laboratory Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Xiao-Ke Hao
- Center of Clinical Laboratory Medicine of PLA, Department of Laboratory Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Jia-Yun Liu
- Center of Clinical Laboratory Medicine of PLA, Department of Laboratory Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
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