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Yan K, Yao J, Liu L, Liang W, Cai Y. Effects of low-frequency ultrasound combined with anti-MRSA agents on the mouse model of pulmonary infection. Microbiol Spectr 2024; 12:e0101623. [PMID: 38323827 PMCID: PMC10913739 DOI: 10.1128/spectrum.01016-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 01/15/2024] [Indexed: 02/08/2024] Open
Abstract
The treatment of methicillin-resistant Staphylococcus aureus (MRSA)-induced pneumonia with antibiotics alone poses considerable challenges. To address these challenges, low-frequency ultrasound (LFU) emerges as a promising approach. In this study, a mouse pneumonia model was established through intratracheal injection of MRSA to investigate the therapeutic efficacy of LFU in combination with antibiotics. Minimal inhibitory concentration was assessed, and the distribution of antibiotics in the lung and plasma was determined using liquid chromatography coupled with mass spectrometry. Various parameters, including the survival rate, histopathology, lung bacterial clearance, and the expressions of cytokines and inflammation-related genes, were evaluated before and after treatment. Compared with the infection group, both the antibiotic-alone groups [vancomycin (VCM), linezolid, and contezolid (CZD)] and the groups in combination with LFU demonstrated an improvement in the survival status of mice. The average colony-forming units of lung tissue in the LFU combination groups were lower compared with the antibiotic-alone groups. While no significant changes in C-reactive protein and procalcitonin in plasma and bronchoalveolar lavage fluid were observed, histopathological results revealed reduced inflammatory damage in LFU combination groups. The secretion of interleukin-6 and tumor necrosis factor-alpha was decreased by the combination treatment, particularly in the VCM + LFU group. Furthermore, the expressions of MRSA virulence factors (hla and agrA) and inflammation-related genes (Saa3, Cxcl9, and Orm1) were further reduced by the combinations of LFU and antibiotics. Additionally, LFU treatment facilitated the distribution of VCM and CZD in mouse lung tissue at 30 and 45 min, respectively, after dosage.IMPORTANCETreating pneumonia caused by methicillin-resistant Staphylococcus aureus (MRSA) with antibiotics alone poses significant challenges. In this in vivo study, we present compelling evidence supporting the efficacy of low-frequency ultrasound (LFU) as a promising approach to overcome these obstacles. Our findings demonstrated that LFU enhanced the effectiveness of vancomycin, linezolid, and contezolid in an MRSA pneumonia model. The combination of LFU with anti-MRSA agents markedly improved the survival rate of mice, accelerated the clearance of pulmonary bacteria, reduced inflammatory injury, inhibited the production of MRSA endotoxin, and enhanced the distribution of antibiotics in lung tissue. The application of LFU in the treatment of pulmonary infections held substantial significance. We believe that readers of your journal will find this topic of considerable interest.
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Affiliation(s)
- Kaicheng Yan
- Department of Pharmacy, Center of Medicine Clinical Research, Medical Supplies Center, Chinese PLA General Hospital, Beijing, China
- Unit 32701 of Chinese PLA, Beijing, China
| | - Jiahui Yao
- Department of Pharmacy, Center of Medicine Clinical Research, Medical Supplies Center, Chinese PLA General Hospital, Beijing, China
| | - Lingling Liu
- Department of Pharmacy, Center of Medicine Clinical Research, Medical Supplies Center, Chinese PLA General Hospital, Beijing, China
| | - Wenxin Liang
- Department of Pharmacy, Center of Medicine Clinical Research, Medical Supplies Center, Chinese PLA General Hospital, Beijing, China
| | - Yun Cai
- Department of Pharmacy, Center of Medicine Clinical Research, Medical Supplies Center, Chinese PLA General Hospital, Beijing, China
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Bhattacharya M, Horswill AR. The role of human extracellular matrix proteins in defining Staphylococcus aureus biofilm infections. FEMS Microbiol Rev 2024; 48:fuae002. [PMID: 38337187 PMCID: PMC10873506 DOI: 10.1093/femsre/fuae002] [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: 07/19/2023] [Revised: 01/26/2024] [Accepted: 02/07/2024] [Indexed: 02/12/2024] Open
Abstract
Twenty to forty one percent of the world's population is either transiently or permanently colonized by the Gram-positive bacterium, Staphylococcus aureus. In 2017, the CDC designated methicillin-resistant S. aureus (MRSA) as a serious threat, reporting ∼300 000 cases of MRSA-associated hospitalizations annually, resulting in over 19 000 deaths, surpassing that of HIV in the USA. S. aureus is a proficient biofilm-forming organism that rapidly acquires resistance to antibiotics, most commonly methicillin (MRSA). This review focuses on a large group of (>30) S. aureus adhesins, either surface-associated or secreted that are designed to specifically bind to 15 or more of the proteins that form key components of the human extracellular matrix (hECM). Importantly, this includes hECM proteins that are pivotal to the homeostasis of almost every tissue environment [collagen (skin), proteoglycans (lung), hemoglobin (blood), elastin, laminin, fibrinogen, fibronectin, and fibrin (multiple organs)]. These adhesins offer S. aureus the potential to establish an infection in every sterile tissue niche. These infections often endure repeated immune onslaught, developing into chronic, biofilm-associated conditions that are tolerant to ∼1000 times the clinically prescribed dose of antibiotics. Depending on the infection and the immune response, this allows S. aureus to seamlessly transition from colonizer to pathogen by subtly manipulating the host against itself while providing the time and stealth that it requires to establish and persist as a biofilm. This is a comprehensive discussion of the interaction between S. aureus biofilms and the hECM. We provide particular focus on the role of these interactions in pathogenesis and, consequently, the clinical implications for the prevention and treatment of S. aureus biofilm infections.
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Affiliation(s)
- Mohini Bhattacharya
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO 80045, United States
| | - Alexander R Horswill
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO 80045, United States
- Department of Veterans Affairs, Eastern Colorado Health Care System, Aurora, CO 80045, United States
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Farmand S, Sender V, Karlsson J, Merkl P, Normark S, Henriques-Normark B. STAT3 Deficiency Alters the Macrophage Activation Pattern and Enhances Matrix Metalloproteinase 9 Expression during Staphylococcal Pneumonia. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2024; 212:69-80. [PMID: 37982695 PMCID: PMC10733582 DOI: 10.4049/jimmunol.2300151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 10/19/2023] [Indexed: 11/21/2023]
Abstract
Staphylococcus aureus is a significant cause of morbidity and mortality in pulmonary infections. Patients with autosomal-dominant hyper-IgE syndrome due to STAT3 deficiency are particularly susceptible to acquiring staphylococcal pneumonia associated with lung tissue destruction. Because macrophages are involved in both pathogen defense and inflammation, we investigated the impact of murine myeloid STAT3 deficiency on the macrophage phenotype in vitro and on pathogen clearance and inflammation during murine staphylococcal pneumonia. Murine bone marrow-derived macrophages (BMDM) from STAT3 LysMCre+ knockout or Cre- wild-type littermate controls were challenged with S. aureus, LPS, IL-4, or vehicle control in vitro. Pro- and anti-inflammatory responses as well as polarization and activation markers were analyzed. Mice were infected intratracheally with S. aureus, bronchoalveolar lavage and lungs were harvested, and immunohistofluorescence was performed on lung sections. S. aureus infection of STAT3-deficient BMDM led to an increased proinflammatory cytokine release and to enhanced upregulation of costimulatory MHC class II and CD86. Murine myeloid STAT3 deficiency did not affect pathogen clearance in vitro or in vivo. Matrix metalloproteinase 9 was upregulated in Staphylococcus-treated STAT3-deficient BMDM and in lung tissues of STAT3 knockout mice infected with S. aureus. Moreover, the expression of miR-155 was increased. The enhanced inflammatory responses and upregulation of matrix metalloproteinase 9 and miR-155 expression in murine STAT3-deficient as compared with wild-type macrophages during S. aureus infections may contribute to tissue damage as observed in STAT3-deficient patients during staphylococcal pneumonia.
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Affiliation(s)
- Susan Farmand
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
- Division of Pediatric Stem Cell Transplantation and Immunology, Clinic of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Vicky Sender
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
- Clinical Microbiology, Karolinska University Hospital Solna, Stockholm, Sweden
| | - Jens Karlsson
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
- Clinical Microbiology, Karolinska University Hospital Solna, Stockholm, Sweden
| | - Padryk Merkl
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Staffan Normark
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Birgitta Henriques-Normark
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
- Clinical Microbiology, Karolinska University Hospital Solna, Stockholm, Sweden
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Hong J, Son M, Sin J, Kim H, Chung DK. Nanoparticles of Lactiplantibacillus plantarum K8 Reduce Staphylococcus aureus Respiratory Infection and Tumor Necrosis Factor Alpha- and Interferon Gamma-Induced Lung Inflammation. Nutrients 2023; 15:4728. [PMID: 38004123 PMCID: PMC10675637 DOI: 10.3390/nu15224728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 10/26/2023] [Accepted: 11/07/2023] [Indexed: 11/26/2023] Open
Abstract
Multiple studies have confirmed that Lactiplantibacillus plantarum has beneficial effects in respiratory diseases, including respiratory tract infections, asthma, and chronic obstructive pulmonary disease. However, the role of L. plantarum lysates in respiratory diseases is unclear. Staphylococcus aureus infects the lungs of mice, recruits immune cells, and induces structural changes in alveoli. Lung diseases can be further aggravated by inflammatory cytokines such as CCL2 and interleukin (IL)-6. In in vivo studies, L. plantarum K8 nanoparticles (K8NPs) restored lung function and prevented lung damage caused by S. aureus infection. They inhibited the S. aureus infection and the infiltration of immune cells and prevented the increase in goblet cell numbers in the lungs of S. aureus-infected mice. K8NPs suppressed the expression of CCL2 and IL-6, which were increased by the combination treatment of tumor necrosis factor alpha and interferon gamma (TI), in a dose-dependent manner. In in vitro studies, the anti-inflammatory effect of K8NPs in TI-treated A549 cells and TI-injected mice occurred through the reduction in activated mitogen-activated protein kinases and nuclear factor kappa-B. These findings suggest that the efficacy of K8NPs in controlling respiratory inflammation and infection can be used to develop functional materials that can prevent or alleviate respiratory diseases.
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Affiliation(s)
- Jonghyo Hong
- Graduate School of Biotechnology, Kyung Hee University, Yongin 17104, Republic of Korea; (J.H.); (M.S.); (J.S.)
| | - Minseong Son
- Graduate School of Biotechnology, Kyung Hee University, Yongin 17104, Republic of Korea; (J.H.); (M.S.); (J.S.)
| | - Jaeeun Sin
- Graduate School of Biotechnology, Kyung Hee University, Yongin 17104, Republic of Korea; (J.H.); (M.S.); (J.S.)
| | - Hangeun Kim
- Research and Development Center, Skin Biotechnology Center Co., Ltd., Yongin 17104, Republic of Korea
| | - Dae-Kyun Chung
- Graduate School of Biotechnology, Kyung Hee University, Yongin 17104, Republic of Korea; (J.H.); (M.S.); (J.S.)
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Tang S, De Jesus AC, Chavez D, Suthakaran S, Moore SK, Suthakaran K, Homami S, Rathnasinghe R, May AJ, Schotsaert M, Britto CJ, Bhattacharya J, Hook JL. Rescue of alveolar wall liquid secretion blocks fatal lung injury due to influenza-staphylococcal coinfection. J Clin Invest 2023; 133:e163402. [PMID: 37581936 PMCID: PMC10541650 DOI: 10.1172/jci163402] [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: 07/08/2022] [Accepted: 08/10/2023] [Indexed: 08/17/2023] Open
Abstract
Secondary lung infection by inhaled Staphylococcus aureus (SA) is a common and lethal event for individuals infected with influenza A virus (IAV). How IAV disrupts host defense to promote SA infection in lung alveoli, where fatal lung injury occurs, is not known. We addressed this issue using real-time determinations of alveolar responses to IAV in live, intact, perfused lungs. Our findings show that IAV infection blocked defensive alveolar wall liquid (AWL) secretion and induced airspace liquid absorption, thereby reversing normal alveolar liquid dynamics and inhibiting alveolar clearance of inhaled SA. Loss of AWL secretion resulted from inhibition of the cystic fibrosis transmembrane conductance regulator (CFTR) ion channel in the alveolar epithelium, and airspace liquid absorption was caused by stimulation of the alveolar epithelial Na+ channel (ENaC). Loss of AWL secretion promoted alveolar stabilization of inhaled SA, but rescue of AWL secretion protected against alveolar SA stabilization and fatal SA-induced lung injury in IAV-infected mice. These findings reveal a central role for AWL secretion in alveolar defense against inhaled SA and identify AWL inhibition as a critical mechanism of IAV lung pathogenesis. AWL rescue may represent a new therapeutic approach for IAV-SA coinfection.
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Affiliation(s)
- Stephanie Tang
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
- Graduate School of Biomedical Sciences
| | - Ana Cassandra De Jesus
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
| | - Deebly Chavez
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
| | - Sayahi Suthakaran
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
- Graduate School of Biomedical Sciences
| | - Sarah K.L. Moore
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
| | - Keshon Suthakaran
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
| | - Sonya Homami
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
- Graduate School of Biomedical Sciences
| | - Raveen Rathnasinghe
- Graduate School of Biomedical Sciences
- Global Health and Emerging Pathogens Institute, Department of Microbiology
| | - Alison J. May
- Department of Cell, Developmental and Regenerative Biology
- Department of Otolaryngology, and
- Institute of Regenerative Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Michael Schotsaert
- Global Health and Emerging Pathogens Institute, Department of Microbiology
| | - Clemente J. Britto
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Jahar Bhattacharya
- Departments of Medicine and Physiology and Cellular Biophysics, College of Physicians and Surgeons, Columbia University Medical Center, New York, New York, USA
| | - Jaime L. Hook
- Lung Imaging Laboratory, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
- Global Health and Emerging Pathogens Institute, Department of Microbiology
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Han S, Moon S, Chung YW, Ryu JH. NADPH Oxidase 4-mediated Alveolar Macrophage Recruitment to Lung Attenuates Neutrophilic Inflammation in Staphylococcus aureus Infection. Immune Netw 2023; 23:e42. [PMID: 37970233 PMCID: PMC10643333 DOI: 10.4110/in.2023.23.e42] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 09/25/2023] [Accepted: 10/22/2023] [Indexed: 11/17/2023] Open
Abstract
When the lungs are infected with bacteria, alveolar macrophages (AMs) are recruited to the site and play a crucial role in protecting the host by reducing excessive lung inflammation. However, the regulatory mechanisms that trigger the recruitment of AMs to lung alveoli during an infection are still not fully understood. In this study, we identified a critical role for NADPH oxidase 4 (NOX4) in the recruitment of AMs during Staphylococcus aureus lung infection. We found that NOX4 knockout (KO) mice showed decreased recruitment of AMs and increased lung neutrophils and injury in response to S. aureus infection compared to wild-type (WT) mice. Interestingly, the burden of S. aureus in the lungs was not different between NOX4 KO and WT mice. Furthermore, we observed that depletion of AMs in WT mice during S. aureus infection increased the number of neutrophils and lung injury to a similar level as that observed in NOX4 KO mice. Additionally, we found that expression of intercellular adhesion molecule-1 (ICAM1) in NOX4 KO mice-derived lung endothelial cells was lower than that in WT mice-derived endothelial cells. Therefore, we conclude that NOX4 plays a crucial role in inducing the recruitment of AMs by controlling ICAM1 expression in lung endothelial cells, which is responsible for resolving lung inflammation during acute S. aureus infection.
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Affiliation(s)
- Seunghan Han
- Department of Biomedical Sciences, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Sungmin Moon
- Department of Biomedical Sciences, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Youn Wook Chung
- Department of Biomedical Sciences, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Ji-Hwan Ryu
- Department of Biomedical Sciences, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul 03722, Korea
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Zheng P, Liu F, Long J, Jin Y, Chen S, Duan G, Yang H. Latest Advances in the Application of Humanized Mouse Model for Staphylococcus aureus. J Infect Dis 2023; 228:800-809. [PMID: 37392466 DOI: 10.1093/infdis/jiad253] [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: 04/14/2023] [Revised: 06/21/2023] [Accepted: 06/29/2023] [Indexed: 07/03/2023] Open
Abstract
Staphylococcus aureus (S. aureus) is an important pathogen for humans and can cause a wide range of diseases, from mild skin infections, severe osteomyelitis to fatal pneumonia, sepsis, and septicemia. The mouse models have greatly facilitated the development of S. aureus studies. However, due to the substantial differences in immune system between mice and humans, the conventional mouse studies are not predictive of success in humans, in which case humanized mice may overcome this limitation to some extent. Humanized mice can be used to study the human-specific virulence factors produced by S. aureus and the mechanisms by which S. aureus interacts with humans. This review outlined the latest advances in humanized mouse models used in S. aureus studies.
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Affiliation(s)
- Ping Zheng
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou, China
| | - Fang Liu
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou, China
| | - Jinzhao Long
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou, China
| | - Yuefei Jin
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou, China
| | - Shuaiyin Chen
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou, China
| | - Guangcai Duan
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou, China
| | - Haiyan Yang
- Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou, China
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Yohannes H, Belachew T, Assefa M, Getaneh E, Zeray H, Kegne A, Angawu S, Belay G, Biset S, Tigabu A. Pathogenic bacteria recovered from Gene X-pert tuberculosis-negative adult patients in Gondar, Northwest Ethiopia. BMC Pulm Med 2023; 23:197. [PMID: 37280538 DOI: 10.1186/s12890-023-02500-w] [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: 11/29/2022] [Accepted: 05/30/2023] [Indexed: 06/08/2023] Open
Abstract
INTRODUCTION Lower respiratory tract infections (LRTIs) caused by drug-resistant pathogenic bacteria is a major problem in developing countries including Ethiopia. Therefore, this study aimed to determine the pathogenic bacteria and their antimicrobial susceptibility patterns among Gene X-pert tuberculosis-negative adult patients with clinically suspected LRTIs at the University of Gondar Comprehensive Specialized Referral Hospital, Gondar, Northwest Ethiopia. METHODS This institutional-based cross-sectional study was conducted from February 01 to March 15, 2020. Socio-demographic data were collected by using a structured questionnaire. A total of 254 sputum specimens were collected from Gene X-pert tuberculosis-negative patients. Bacterial recovery was performed using blood, chocolate, and MacConkey agar plates. Bacterial isolates were identified based on Gram staining, colony characteristics, and biochemical reactions. Antimicrobial susceptibility testing was performed using the Kirby-Bauer disk diffusion method. Methicillin resistance of S. aureus was confirmed using cefoxitin (30 µg). Descriptive statistics were calculated for each variable and results are shown in tables and figures. RESULTS In this study, the overall sputum culture positivity rate was 145/254 (57.1%). Gram-negative bacteria 111 (64.9%) were predominant compared to Gram-positive bacteria 60 (35.1%). Of the 145 culture-positive cases, 26 (14.8%) had poly-bacterial infections. S. aureus 40 (66.7%) was the predominant Gram-positive bacterium whereas K. pneumoniae 33 (29.7%), was the most isolated Gram-negative bacterium. Bacterial species, such as S. aureus were sensitive to ciprofloxacin 38/40 (95.0%), gentamicin 37/40 (92.5%), cefoxitin 36/40 (90.0%), and clindamycin 34/40 (85.0%). The proportion of Methicillin-resistant S. aureus was low, 4(10.0%). S. pneumoniae was sensitive to chloramphenicol 8/9 (88.9%) and resistant to ciprofloxacin 6/9 (66.7%). K pneumoniae, P. aeruginosa, E. coli, Serratia species, and H. influenzae also demonstrated high levels of resistance to ampicillin at rates of 21/33 (63.6%), 8/8 (100.0%), 15/17 (88.2%), 7/10 (70.0%), and 6/6 (100.0%), respectively. CONCLUSION This study revealed a higher burden of Gram-negative and Gram-positive pathogenic bacterial agents, which is responsible for LRTs. Therefore, routine sputum culture identification and antibiotic susceptibility testing should be performed in Gene X-pert tuberculosis-negative patients.
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Affiliation(s)
- Hana Yohannes
- Department of Immunology and Molecular biology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
| | - Teshome Belachew
- Department of Medical Microbiology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
| | - Muluneh Assefa
- Department of Medical Microbiology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia.
| | - Eden Getaneh
- Department of Medical Microbiology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
| | - Haymanot Zeray
- University of Gondar Comprehensive Specialized Referral Hospital, University of Gondar, Gondar, Ethiopia
| | - Asamirew Kegne
- University of Gondar Comprehensive Specialized Referral Hospital, University of Gondar, Gondar, Ethiopia
| | - Samre Angawu
- University of Gondar Comprehensive Specialized Referral Hospital, University of Gondar, Gondar, Ethiopia
| | - Gizeaddis Belay
- University of Gondar Comprehensive Specialized Referral Hospital, University of Gondar, Gondar, Ethiopia
| | - Sirak Biset
- Department of Medical Microbiology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
| | - Abiye Tigabu
- Department of Medical Microbiology, School of Biomedical and Laboratory Sciences, College of Medicine and Health Sciences, University of Gondar, Gondar, Ethiopia
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Condinho M, Carvalho B, Cruz A, Pinto SN, Arraiano CM, Pobre V. The role of RNA regulators, quorum sensing and c-di-GMP in bacterial biofilm formation. FEBS Open Bio 2023; 13:975-991. [PMID: 35234364 PMCID: PMC10240345 DOI: 10.1002/2211-5463.13389] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 02/15/2022] [Accepted: 02/28/2022] [Indexed: 11/10/2022] Open
Abstract
Biofilms provide an ecological advantage against many environmental stressors, such as pH and temperature, making it the most common life-cycle stage for many bacteria. These protective characteristics make eradication of bacterial biofilms challenging. This is especially true in the health sector where biofilm formation on hospital or patient equipment, such as respirators, or catheters, can quickly become a source of anti-microbial resistant strains. Biofilms are complex structures encased in a self-produced polymeric matrix containing numerous components such as polysaccharides, proteins, signalling molecules, extracellular DNA and extracellular RNA. Biofilm formation is tightly controlled by several regulators, including quorum sensing (QS), cyclic diguanylate (c-di-GMP) and small non-coding RNAs (sRNAs). These three regulators in particular are fundamental in all stages of biofilm formation; in addition, their pathways overlap, and the significance of their role is strain-dependent. Currently, ribonucleases are also of interest for their potential role as biofilm regulators, and their relationships with QS, c-di-GMP and sRNAs have been investigated. This review article will focus on these four biofilm regulators (ribonucleases, QS, c-di-GMP and sRNAs) and the relationships between them.
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Affiliation(s)
- Manuel Condinho
- Instituto de Tecnologia Química e Biológica António XavierUniversidade Nova de LisboaOeirasPortugal
| | - Beatriz Carvalho
- Instituto de Tecnologia Química e Biológica António XavierUniversidade Nova de LisboaOeirasPortugal
| | - Adriana Cruz
- iBB‐Institute for Bioengineering and Biosciences (IBB)Instituto Superior TécnicoLisboaPortugal
- i4HB‐Institute for Health and BioeconomyInstituto Superior TécnicoLisboaPortugal
| | - Sandra N. Pinto
- iBB‐Institute for Bioengineering and Biosciences (IBB)Instituto Superior TécnicoLisboaPortugal
- i4HB‐Institute for Health and BioeconomyInstituto Superior TécnicoLisboaPortugal
| | - Cecília M. Arraiano
- Instituto de Tecnologia Química e Biológica António XavierUniversidade Nova de LisboaOeirasPortugal
| | - Vânia Pobre
- Instituto de Tecnologia Química e Biológica António XavierUniversidade Nova de LisboaOeirasPortugal
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Randjelović M, Branković S, Jovanović M, Kitić N, Živanović S, Mihajilov-Krstev T, Miladinović B, Milutinović M, Kitić D. An In Vitro and In Silico Characterization of Salvia sclarea L. Methanolic Extracts as Spasmolytic Agents. Pharmaceutics 2023; 15:pharmaceutics15051376. [PMID: 37242618 DOI: 10.3390/pharmaceutics15051376] [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: 04/03/2023] [Revised: 04/24/2023] [Accepted: 04/25/2023] [Indexed: 05/28/2023] Open
Abstract
The use of medicinal plant species and their products is widespread in the field of gastrointestinal and respiratory diseases. This study aimed to evaluate the traditional use of Salvia sclarea L., clary sage, finding the possible mechanisms of its spasmolytic and bronchodilator actions in in vitro conditions supported by molecular docking analysis, along with the antimicrobial effects. Four dry extracts were prepared from the aerial parts of S. sclarea, using absolute or 80% (v/v) methanol by the method of a single-stage maceration or an ultrasound-assisted extraction. Characterization of the bioactive compounds by high-performance liquid chromatography indicated the presence of significant amounts of polyphenolics, with rosmarinic acid as the prevalent one. The spontaneous ileal contractions were best inhibited by the extract prepared with 80% methanol and maceration. The same extract was superior in the carbachol- and KCl-induced tracheal smooth muscle contractions, being the strongest bronchodilator agent. The most powerful relaxation of KCl-induced ileal contractions was achieved with the extract made of absolute methanol by maceration, while the 80% methanolic extract made with the ultrasound method generated the best spasmolytic effects in the acetylcholine-induced ileal contractions. Docking analysis suggested that apigenin-7-O-glucoside and luteolin-7-O-glucoside exhibited the highest binding affinity to voltage-gated calcium channels. Gram (+) bacteria were more susceptible to the effects of the extracts, particularly Staphylococcus aureus, in contrast to Gram (-) bacteria and Candida albicans. This is the first study to point out the influence of S. sclarea methanolic extracts on the gastrointestinal and respiratory spasm reduction, paving the way for their potential place in complementary medicine.
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Affiliation(s)
- Milica Randjelović
- Department of Pharmacy, Faculty of Medicine, University of Niš, Blvd. Dr Zorana Djindjića 81, 18000 Niš, Serbia
| | - Suzana Branković
- Department of Physiology, Faculty of Medicine, University of Niš, Blvd. Dr Zorana Djindjića 81, 18000 Niš, Serbia
| | - Miloš Jovanović
- Department of Pharmacy, Faculty of Medicine, University of Niš, Blvd. Dr Zorana Djindjića 81, 18000 Niš, Serbia
| | - Nemanja Kitić
- Faculty of Medicine, University of Niš, Blvd. Dr Zorana Djindjića 81, 18000 Niš, Serbia
| | - Slavoljub Živanović
- Research Center for Biomedicine, Faculty of Medicine, University of Niš, Blvd. Dr Zorana Djindjića 81, 18000 Niš, Serbia
| | - Tatjana Mihajilov-Krstev
- Department of Biology and Ecology, Faculty of Science and Mathematics, University of Nis, Višegradska 33, 18000 Niš, Serbia
| | - Bojana Miladinović
- Department of Pharmacy, Faculty of Medicine, University of Niš, Blvd. Dr Zorana Djindjića 81, 18000 Niš, Serbia
| | - Milica Milutinović
- Department of Pharmacy, Faculty of Medicine, University of Niš, Blvd. Dr Zorana Djindjića 81, 18000 Niš, Serbia
| | - Dušanka Kitić
- Department of Pharmacy, Faculty of Medicine, University of Niš, Blvd. Dr Zorana Djindjića 81, 18000 Niš, Serbia
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11
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Bach H, Lorenzo-Leal AC. Use of niosomes for the treatment of intracellular pathogens infecting the lungs. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2023:e1891. [PMID: 37032602 DOI: 10.1002/wnan.1891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 02/24/2023] [Accepted: 03/14/2023] [Indexed: 06/19/2023]
Abstract
The delivery of drugs in an encapsulated environment is designed to precisely target specific tissues, avoiding a systemic circulation of the drug. Lungs are organs exposed to the environment with multiple defense barriers. However, many pathogens can still colonize and infect the airways bypassing the hostile environment of the lungs. In more complicated situations, some pathogens have developed strategies to multiply and survive within macrophages, one of the first immune cell responses to clearing infections in mammals. Niosomes are artificial vesicles that can be loaded with drugs, offering an alternative strategy to treat intracellular pathogens as nanocarriers. Members of the mycobacteria genus are intracellular pathogens that have evolved to escape the immunological response, specifically in macrophages, the white cells responsible for the clearance of pathogens. This review analyzed the state-of-the-art niosome synthesis aimed at tackling the problem of intracellular pathogen therapy. This article is categorized under: Therapeutic Approaches and Drug Discovery > Nanomedicine for Infectious Disease Nanotechnology Approaches to Biology > Nanoscale Systems in Biology.
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Affiliation(s)
- Horacio Bach
- Department of Medicine, Division of Infectious Diseases, University of British Columbia, Vancouver, British Columbia, Canada
| | - Ana C Lorenzo-Leal
- Department of Medicine, Division of Infectious Diseases, University of British Columbia, Vancouver, British Columbia, Canada
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12
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Gopallawa I, Dehinwal R, Bhatia V, Gujar V, Chirmule N. A four-part guide to lung immunology: Invasion, inflammation, immunity, and intervention. Front Immunol 2023; 14:1119564. [PMID: 37063828 PMCID: PMC10102582 DOI: 10.3389/fimmu.2023.1119564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 03/09/2023] [Indexed: 04/03/2023] Open
Abstract
Lungs are important respiratory organs primarily involved in gas exchange. Lungs interact directly with the environment and their primary function is affected by several inflammatory responses caused by allergens, inflammatory mediators, and pathogens, eventually leading to disease. The immune architecture of the lung consists of an extensive network of innate immune cells, which induce adaptive immune responses based on the nature of the pathogen(s). The balance of immune responses is critical for maintaining immune homeostasis in the lung. Infection by pathogens and physical or genetic dysregulation of immune homeostasis result in inflammatory diseases. These responses culminate in the production of a plethora of cytokines such as TSLP, IL-9, IL-25, and IL-33, which have been implicated in the pathogenesis of several inflammatory and autoimmune diseases. Shifting the balance of Th1, Th2, Th9, and Th17 responses have been the targets of therapeutic interventions in the treatment of these diseases. Here, we have briefly reviewed the innate and adaptive i3mmune responses in the lung. Genetic and environmental factors, and infection are the major causes of dysregulation of various functions of the lung. We have elaborated on the impact of inflammatory and infectious diseases, advances in therapies, and drug delivery devices on this critical organ. Finally, we have provided a comprehensive compilation of different inflammatory and infectious diseases of the lungs and commented on the pros and cons of different inhalation devices for the management of lung diseases. The review is intended to provide a summary of the immunology of the lung, with an emphasis on drug and device development.
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Affiliation(s)
- Indiwari Gopallawa
- Clinical Pharmacology & Safety Sciences, Biopharmaceuticals R&D, AstraZeneca, Gaithersburg, MD, United States
| | - Ruchika Dehinwal
- Department of Microbiology, Division of Infectious Disease, Brigham Women’s Hospital, Harvard Medical School, Howard Hughes Medical Institute, Boston, MA, United States
| | | | - Vikramsingh Gujar
- Department of Anatomy and Cell Biology, Oklahoma State University Center for Health Sciences, Tulsa, OK, United States
| | - Narendra Chirmule
- R&D Department, SymphonyTech Biologics, Philadelphia, PA, United States
- *Correspondence: Narendra Chirmule,
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13
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In Silico Genome-Scale Analysis of Molecular Mechanisms Contributing to the Development of a Persistent Infection with Methicillin-Resistant Staphylococcus aureus (MRSA) ST239. Int J Mol Sci 2022; 23:ijms232416086. [PMID: 36555727 PMCID: PMC9781258 DOI: 10.3390/ijms232416086] [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: 10/30/2022] [Revised: 12/05/2022] [Accepted: 12/11/2022] [Indexed: 12/23/2022] Open
Abstract
The increasing frequency of isolation of methicillin-resistant Staphylococcus aureus (MRSA) limits the chances for the effective antibacterial therapy of staphylococcal diseases and results in the development of persistent infection such as bacteremia and osteomyelitis. The aim of this study was to identify features of the MRSAST239 0943-1505-2016 (SA943) genome that contribute to the formation of both acute and chronic musculoskeletal infections. The analysis was performed using comparative genomics data of the dominant epidemic S. aureus lineages, namely ST1, ST8, ST30, ST36, and ST239. The SA943 genome encodes proteins that provide resistance to the host's immune system, suppress immunological memory, and form biofilms. The molecular mechanisms of adaptation responsible for the development of persistent infection were as follows: amino acid substitution in PBP2 and PBP2a, providing resistance to ceftaroline; loss of a large part of prophage DNA and restoration of the nucleotide sequence of beta-hemolysin, that greatly facilitates the escape of phagocytosed bacteria from the phagosome and formation of biofilms; dysfunction of the AgrA system due to the presence of psm-mec and several amino acid substitutions in the AgrC; partial deletion of the nucleotide sequence in genomic island vSAβ resulting in the loss of two proteases of Spl-operon; and deletion of SD repeats in the SdrE amino acid sequence.
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14
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Yauger CY, Waite LK, Baker K, Mallory A, Attilio LP, Stucky LC, Stone MJ, Ioset MN, Johnson D. Durability and disinfection of single-use endotracheal tubes following exposure to commonly available medical disinfecting compounds. Nurs Outlook 2022; 70:S127-S135. [PMID: 36585059 DOI: 10.1016/j.outlook.2022.08.004] [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: 04/01/2022] [Revised: 08/17/2022] [Accepted: 08/17/2022] [Indexed: 12/30/2022]
Abstract
BACKGROUND Reusing single-use medical supplies offers a capability enhancement during massive casualty incidents when resupply of medical supplies is unavailable in times of national health care crises. This pilot study determined the feasibility of disinfection of endotracheal tubes with commonly used chemical disinfecting agents. METHODS Endotracheal tubes (ETTs) were subjected to either CaviCide, Neutral Disinfectant Cleaner, Cidex, or saline according to the manufacturer's recommended disinfection contact times. Alterations to the polyvinyl chloride (PVC) integrity by disinfecting agents were determined by volume/pressure measurements within the ETT cuff. To test the disinfection rate, ETTs were inoculated with Staphylococcus Aureus and subjected to experimental disinfection protocol. FINDINGS There were no significant alterations to ETT tracheal cuff function and mixed results in disinfection among ETTs. ETTs bacterial culture data presented possible contamination among the groups. DISCUSSION These data support the feasibility of single-use ETT reuse as a last resort while making every attempt and effort to follow established protocols to minimize harm to the patient.
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Affiliation(s)
- Col Young Yauger
- United States Army Graduate Program in Anesthesia Nursing, Joint Base, San Antonio, TX.
| | - Lt Kyle Waite
- Navy Medicine Training and Support Center, Joint Base San Antonio, San Antonio, TX
| | - Kimberly Baker
- Science & Technology 59th Medical Wing, JBSA Lackland Air Force Base, San Antonio, TX
| | - Amber Mallory
- Science & Technology 59th Medical Wing, JBSA Lackland Air Force Base, San Antonio, TX
| | - Ltc Peter Attilio
- Science & Technology 59th Medical Wing, JBSA Lackland Air Force Base, San Antonio, TX
| | - Ltc Christopher Stucky
- Center for Nursing Science and Clinical Inquiry, Landstuhl Regional Medical Center, Germany
| | - Maj Jessica Stone
- United States Army Graduate Program in Anesthesia Nursing, Joint Base, San Antonio, TX
| | - Maj Nicole Ioset
- United States Army Graduate Program in Anesthesia Nursing, Joint Base, San Antonio, TX
| | - Don Johnson
- United States Army Graduate Program in Anesthesia Nursing, Joint Base, San Antonio, TX
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15
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Pepito JE, Prabhakaran JV, Bheeman DKP, Sah P, Villarias AP, Hussain SA, Gangireddygari VSR, Al Adawi AS. Development of saline loaded mask materials, evaluation of the antimicrobial efficacy and survivability of selected bacteria on these mask materials. JOURNAL OF KING SAUD UNIVERSITY - SCIENCE 2022; 34:102125. [PMID: 35663349 PMCID: PMC9137251 DOI: 10.1016/j.jksus.2022.102125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 05/20/2022] [Accepted: 05/23/2022] [Indexed: 11/29/2022]
Abstract
Objective Surgical face masks have been recommended by World Health Organization (WHO) during the COVID-19 pandemic. Nowadays wearing masks have become a norm and lifestyle around the globe. The present investigation was carried out to evaluate the feasibility of developing masks loaded with analytical grade sodium chloride (NaCl), Iodized salts (IS) and Omani sea salt (OSS) with or without sodium bicarbonate (NaHCO3). Methods The saline loaded masks were prepared by soaking the middle layer of the mask in 30% (w/v) saline solutions (NaCl, IS, OSS) with or without 10% NaHCO3 for 24 h followed by drying at room temperature. The prepared saline solutions and its combinations were evaluated for antimicrobial efficacy against the bacteria like Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris, Salmonella typhi, and Staphylococcus aureus, and antifungal activity against the Penicillium spp. and Rhizopus spp. by agar diffusion. Optical microscopy was employed to observe the formation of salt crystal in the mask material. Survivability of S. aureus and P. aeruginosa was tested on the mask material loaded with 30% OSS + 10% NaHCO3 at particular time intervals. Results The results showed that a combination of 30% OSS + 10% NaHCO3 exhibited promising antimicrobial activity against all the bacteria as well as Rhizopus spp. compared to the 30% IS + 10% NaHCO3. Moreover, the middle layer of the mask loaded with saline solutions of 30% OSS + 10% NaHCO3 or 30% IS + 10% NaHCO3 have antibacterial activity, particularly for oral microbiome. On dehydration, the masks materials showed the presence of a significant amount of salt crystals. Survivability tests showed that both S. aureus and P. aeruginosa were killed within 3 h of contact with the salt crystals on the mask materials. Conclusions A combination of 30% OSS + 10% NaHCO3 possessed significant antimicrobial activities on the tested microorganisms. Presence of a significant amount of salt crystals on dehydration of the saline loaded masks can be used as an effective protective barrier to infectious respiratory agents.
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Affiliation(s)
- Julnar Evangelista Pepito
- Applied Biology Section Applied Sciences Department (APS), University of Technology and Applied Sciences (UTAS), Higher College of Technology (HCT), PO Box 74, PC 133, Al-Khuwair, Muscat, Oman
| | - Jayachandran Vavolil Prabhakaran
- Applied Biology Section Applied Sciences Department (APS), University of Technology and Applied Sciences (UTAS), Higher College of Technology (HCT), PO Box 74, PC 133, Al-Khuwair, Muscat, Oman
| | - Dinesh Kada Peela Bheeman
- Applied Biology Section Applied Sciences Department (APS), University of Technology and Applied Sciences (UTAS), Higher College of Technology (HCT), PO Box 74, PC 133, Al-Khuwair, Muscat, Oman
| | - Pankaj Sah
- Applied Biology Section Applied Sciences Department (APS), University of Technology and Applied Sciences (UTAS), Higher College of Technology (HCT), PO Box 74, PC 133, Al-Khuwair, Muscat, Oman
| | - Aldwin Platero Villarias
- Applied Biology Section Applied Sciences Department (APS), University of Technology and Applied Sciences (UTAS), Higher College of Technology (HCT), PO Box 74, PC 133, Al-Khuwair, Muscat, Oman
| | - Shaik Althaf Hussain
- Department of Zoology, College of Science, King Saud University, P.O. Box - 2454, Riyadh 11451, Saudi Arabia
| | - Venkata Subba Reddy Gangireddygari
- Plant Virus Research, Horticultural and Herbal Crop Environment Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju 55365, Republic of Korea
| | - Afraa Said Al Adawi
- Applied Biology Section Applied Sciences Department (APS), University of Technology and Applied Sciences (UTAS), Higher College of Technology (HCT), PO Box 74, PC 133, Al-Khuwair, Muscat, Oman
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16
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R. Borgogna T, M. Voyich J. Examining the Executioners, Influenza Associated Secondary Bacterial Pneumonia. Infect Dis (Lond) 2022. [DOI: 10.5772/intechopen.101666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Influenza infections typically present mild to moderate morbidities in immunocompetent host and are often resolved within 14 days of infection onset. Death from influenza infection alone is uncommon; however, antecedent influenza infection often leads to an increased susceptibility to secondary bacterial pneumonia. Bacterial pneumonia following viral infection exhibits mortality rates greater than 10-fold of those of influenza alone. Furthermore, bacterial pneumonia has been identified as the major contributor to mortality during each of the previous four influenza pandemics. Streptococcus pneumoniae, Staphylococcus aureus, Haemophilus influenzae, and Streptococcus pyogenes are the most prevalent participants in this pathology. Of note, these lung pathogens are frequently found as commensals of the upper respiratory tract. Herein we describe influenza-induced host-changes that lead to increased susceptibility to bacterial pneumonia, review virulence strategies employed by the most prevalent secondary bacterial pneumonia species, and highlight recent findings of bacterial sensing and responding to the influenza infected environment.
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17
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The Influence of Antibiotic Resistance on Innate Immune Responses to Staphylococcus aureus Infection. Antibiotics (Basel) 2022; 11:antibiotics11050542. [PMID: 35625186 PMCID: PMC9138074 DOI: 10.3390/antibiotics11050542] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/13/2022] [Accepted: 04/18/2022] [Indexed: 11/16/2022] Open
Abstract
Staphylococcus aureus (S. aureus) causes a broad range of infections and is associated with significant morbidity and mortality. S. aureus produces a diverse range of cellular and extracellular factors responsible for its invasiveness and ability to resist immune attack. In recent years, increasing resistance to last-line anti-staphylococcal antibiotics daptomycin and vancomycin has been observed. Resistant strains of S. aureus are highly efficient in invading a variety of professional and nonprofessional phagocytes and are able to survive inside host cells. Eliciting immune protection against antibiotic-resistant S. aureus infection is a global challenge, requiring both innate and adaptive immune effector mechanisms. Dendritic cells (DC), which sit at the interface between innate and adaptive immune responses, are central to the induction of immune protection against S. aureus. However, it has been observed that S. aureus has the capacity to develop further antibiotic resistance and acquire increased resistance to immunological recognition by the innate immune system. In this article, we review the strategies utilised by S. aureus to circumvent antibiotic and innate immune responses, especially the interaction between S. aureus and DC, focusing on how this relationship is perturbed with the development of antibiotic resistance.
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18
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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: 0] [Impact Index Per Article: 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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19
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Keum H, Kim D, Whang CH, Kang A, Lee S, Na W, Jon S. Impeding the Medical Protective Clothing Contamination by a Spray Coating of Trifunctional Polymers. ACS OMEGA 2022; 7:10526-10538. [PMID: 35382299 PMCID: PMC8973108 DOI: 10.1021/acsomega.1c04919] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 03/04/2022] [Indexed: 06/14/2023]
Abstract
The risk of fomite-mediated transmission in the clinic is substantially increasing amid the recent COVID-19 pandemic as personal protective equipment (PPE) of hospital workers is easily contaminated by direct contact with infected patients. In this context, it is crucial to devise a means to reduce such transmission. Herein, we report an antimicrobial, antiviral, and antibiofouling trifunctional polymer that can be easily coated onto the surface of medical protective clothing to effectively prevent pathogen contamination on the PPE. The coating layer is formed on the surfaces of PPE by the simple spray coating of an aqueous solution of the trifunctional polymer, poly(dodecyl methacrylate (DMA)-poly(ethylene glycol) methacrylate (PEGMA)-quaternary ammonium (QA)). To establish an optimal ratio of antifouling and antimicrobial functional groups, we performed antifouling, antibacterial, and antiviral tests using four different ratios of the polymers. Antifouling and bactericidal results were assessed using Staphylococcus aureus, a typical pathogenic bacterium that induces an upper respiratory infection. Regardless of the molar ratio, polymer-coated PPE surfaces showed considerable antiadhesion (∼65-75%) and antibacterial (∼75-87%) efficacies soon after being in contact with pathogens and maintained their capability for at least 24 h, which is sufficient for disposable PPEs. Further antiviral tests using coronaviruses showed favorable results with PPE coated at two specific ratios (3.5:6:0.5 and 3.5:5.5:1) of poly(DMA-PEGMA-QA). Moreover, biocompatibility assessments using the two most effective polymer ratios showed no recognizable local or systemic inflammatory responses in mice, suggesting the potential of this polymer for immediate use in the field.
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Affiliation(s)
- Hyeongseop Keum
- KAIST
Institute for the BioCentury, Department of Biological Sciences, Center for Precision
Bio-Nanomedicine, Korea Advanced Institute
of Science and Technology (KAIST), 291 Daehak-ro, Daejeon 34141, Republic of Korea
| | - Dohyeon Kim
- KAIST
Institute for the BioCentury, Department of Biological Sciences, Center for Precision
Bio-Nanomedicine, Korea Advanced Institute
of Science and Technology (KAIST), 291 Daehak-ro, Daejeon 34141, Republic of Korea
| | - Chang-Hee Whang
- KAIST
Institute for the BioCentury, Department of Biological Sciences, Center for Precision
Bio-Nanomedicine, Korea Advanced Institute
of Science and Technology (KAIST), 291 Daehak-ro, Daejeon 34141, Republic of Korea
| | - Aram Kang
- College
of Pharmacy, Korea University, 2511 Sejong-ro, Sejong 30019, Republic
of Korea
| | - Seojung Lee
- KAIST
Institute for the BioCentury, Department of Biological Sciences, Center for Precision
Bio-Nanomedicine, Korea Advanced Institute
of Science and Technology (KAIST), 291 Daehak-ro, Daejeon 34141, Republic of Korea
| | - Woonsung Na
- College
of Veterinary Medicine, Chonnam University, 77 Yongbong-ro, Gwangju 61186, Republic
of Korea
| | - Sangyong Jon
- KAIST
Institute for the BioCentury, Department of Biological Sciences, Center for Precision
Bio-Nanomedicine, Korea Advanced Institute
of Science and Technology (KAIST), 291 Daehak-ro, Daejeon 34141, Republic of Korea
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20
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Selim S, Faried OA, Almuhayawi MS, Saleh FM, Sharaf M, El Nahhas N, Warrad M. Incidence of Vancomycin-Resistant Staphylococcus aureus Strains among Patients with Urinary Tract Infections. Antibiotics (Basel) 2022; 11:antibiotics11030408. [PMID: 35326871 PMCID: PMC8944512 DOI: 10.3390/antibiotics11030408] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 03/15/2022] [Accepted: 03/16/2022] [Indexed: 12/29/2022] Open
Abstract
There has been a substantial rise in the number of vancomycin-resistant Staphylococcus aureus (VRSA) strains during the last several years. The proportion of vancomycin-resistant strains among isolated S. aureus has risen steadily in recent years, with the first spike occurring in critical care units and thereafter in general hospital wards. S. aureus isolates from urinary tract infection patients were studied for their prevalence and antibiotic resistance. From 292 urine samples, 103 bacterial strains (35.3%) were identified as S. aureus. Various antibiotics were used to test the isolates’ antibacterial resistance profiles. Antibiotic resistance to erythromycin was found in most bacterial isolates, whereas tobramycin antibiotic sensitivity was found in most of them. Vancomycin resistance was found in 23 of all S. aureus isolates in this study. Analysis for β-lactamase found that 71% of S. aureus isolates were positive in all isolates. There was a single plasmid with a molecular weight of 39.306 Kbp in five selected VRSA isolates that was subjected to plasmid analysis. There was evidence of vancomycin resistance among the S. aureus isolates collected from UTI patients in this investigation. This vancomycin resistance pretenses a challenge in the treatment of S. aureus infections and the need to precisely recognize persons who require last-resort medication such as tobramycin.
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Affiliation(s)
- Samy Selim
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Jouf University, Sakaka 72341, Saudi Arabia
- Correspondence:
| | - Osama Ahmed Faried
- Medical Microbiology and Immunology Department, Faculty of Medicine, Beni-Suef University, Beni-Suef 62513, Egypt;
| | - Mohammed S. Almuhayawi
- Department of Medical Microbiology and Parasitology, Faculty of Medicine, King Abdulaziz University, Jeddah 21589, Saudi Arabia;
| | - Fayez M. Saleh
- Department of Medical Microbiology, Faculty of Medicine, University of Tabuk, Tabuk 71491, Saudi Arabia;
| | - Mohamed Sharaf
- Department of Biochemistry, Faculty of Agriculture, AL-Azhar University, Cairo 11651, Egypt;
- Department of Biochemistry and Molecular Biology, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Nihal El Nahhas
- Department of Botany and Microbiology, Faculty of Science, Alexandria University, Alexandria 21526, Egypt;
| | - Mona Warrad
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences at Al-Quriat, Jouf University, Al-Quriat 77454, Saudi Arabia;
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21
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OUP accepted manuscript. J Antimicrob Chemother 2022; 77:1617-1624. [DOI: 10.1093/jac/dkac069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Accepted: 02/10/2022] [Indexed: 11/12/2022] Open
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22
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Kim S, Kim JJ, Jeong JH, Kim Y, Park J, Jeong DI, Kim HJ, Hwang C, Ahn SH, Ko HJ, Cho HJ. Fast dissolving nanofiber mat for the local antimicrobial application of roxithromycin in oral cavity. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 131:112537. [PMID: 34857312 DOI: 10.1016/j.msec.2021.112537] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 10/16/2021] [Accepted: 11/02/2021] [Indexed: 12/22/2022]
Abstract
Fast disintegrating and dissolving nanofiber (NF) mat was devised to deliver roxithromycin for the treatment of the respiratory tract infection. NF membrane was made by an electrospinning process with poly(vinyl alcohol) (PVA), hydroxypropyl-β-cyclodextrin (HP-β-CD), and d-α-tocopheryl polyethylene glycol succinate (TPGS) for local application of roxithromycin. Roxithromycin has a poor water solubility thus HP-β-CD is introduced for enhancing drug solubility by forming an inclusion complex in this study. The addition of TPGS provided multiple roles such as accelerating wetting, disintegration, and dissolution speed and overcoming bacterial resistance. Roxithromycin was successfully entrapped in NF structure and drug amorphization occurred during the electrospinning process. PVA/HP-β-CD/TPGS/roxithromycin (PHTR) NF exhibited faster wetting, disintegration, and dissolution speed rather than the other NF mats. PHTR NF displayed higher antibacterial potentials in Gram-negative bacteria (E. coli) and Gram-positive bacteria (S. aureus) compared to other NF mat formulations. The administration of PHTR NF to oral cavity in pneumococcal disease mouse model provided the most efficient therapeutic potentials in lung tissue. Designed multiple phase-based NF mat may be one of powerful local drug delivery systems for the therapy of respiratory tract infection.
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Affiliation(s)
- Sungyun Kim
- Department of Pharmacy, College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
| | - Jung-Jin Kim
- Department of Pharmacy, College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea; Sama Pharm Co. Ltd., Wonju, Gangwon 26365, Republic of Korea
| | - Jae-Hyeon Jeong
- Department of Pharmacy, College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
| | - Yonghoon Kim
- Sama Pharm Co. Ltd., Wonju, Gangwon 26365, Republic of Korea
| | - JiHye Park
- Department of Pharmacy, College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
| | - Da In Jeong
- Department of Pharmacy, College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
| | - Hyun Jin Kim
- Department of Pharmacy, College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
| | - ChaeRim Hwang
- Department of Pharmacy, College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
| | - Sung-Hoon Ahn
- Department of Pharmacy, College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
| | - Hyun-Jeong Ko
- Department of Pharmacy, College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea.
| | - Hyun-Jong Cho
- Department of Pharmacy, College of Pharmacy, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea.
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Delanghe L, Cauwenberghs E, Spacova I, De Boeck I, Van Beeck W, Pepermans K, Claes I, Vandenheuvel D, Verhoeven V, Lebeer S. Cotton and Surgical Face Masks in Community Settings: Bacterial Contamination and Face Mask Hygiene. Front Med (Lausanne) 2021; 8:732047. [PMID: 34540873 PMCID: PMC8446422 DOI: 10.3389/fmed.2021.732047] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 08/09/2021] [Indexed: 11/13/2022] Open
Abstract
During the current COVID-19 pandemic, the use of face masks has become increasingly recommended and even mandatory in community settings. To evaluate the risk of bacterial cross-contamination, this study analyzed the bacterial bioburden of disposable surgical masks and homemade cotton masks, and surveyed the habits and face mask preferences of the Flemish population. Using culture approaches and 16S rRNA gene amplicon sequencing, we analyzed the microbial community on surgical and/or cotton face masks of 13 healthy volunteers after 4 h of wearing. Cotton and surgical masks contained on average 1.46 × 105 CFU/mask and 1.32 × 104 CFU/mask, respectively. Bacillus, Staphylococcus, and Acinetobacter spp. were mostly cultured from the masks and 43% of these isolates were resistant to ampicillin or erythromycin. Microbial profiling demonstrated a consistent difference between mask types. Cotton masks mainly contained Roseomonas, Paracoccus, and Enhydrobacter taxa and surgical masks Streptococcus and Staphylococcus. After 4 h of mask wearing, the microbiome of the anterior nares and the cheek showed a trend toward an altered beta-diversity. According to dedicated questions in the large-scale Corona survey of the University of Antwerp with almost 25,000 participants, only 21% of responders reported to clean their cotton face mask daily. Laboratory results indicated that the best mask cleaning methods were boiling at 100°C, washing at 60°C with detergent or ironing with a steam iron. Taken together, this study suggests that a considerable number of bacteria, including pathobionts and antibiotic resistant bacteria, accumulate on surgical and even more on cotton face masks after use. Based on our results, face masks should be properly disposed of or sterilized after intensive use. Clear guidelines for the general population are crucial to reduce the bacteria-related biosafety risk of face masks, and measures such as physical distancing and increased ventilation should not be neglected when promoting face mask use.
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Affiliation(s)
- Lize Delanghe
- Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium
| | - Eline Cauwenberghs
- Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium
| | - Irina Spacova
- Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium
| | - Ilke De Boeck
- Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium
| | - Wannes Van Beeck
- Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium
| | - Koen Pepermans
- Faculty of Social Sciences, University of Antwerp, Antwerp, Belgium
| | - Ingmar Claes
- Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium
| | - Dieter Vandenheuvel
- Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium
| | - Veronique Verhoeven
- Department of Primary and Interdisciplinary Care (FAMPOP), University of Antwerp, Antwerp, Belgium
| | - Sarah Lebeer
- Department of Bioscience Engineering, University of Antwerp, Antwerp, Belgium
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24
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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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25
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Growth and Stress Tolerance Comprise Independent Metabolic Strategies Critical for Staphylococcus aureus Infection. mBio 2021; 12:e0081421. [PMID: 34101490 PMCID: PMC8262855 DOI: 10.1128/mbio.00814-21] [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] [Indexed: 01/20/2023] Open
Abstract
Staphylococcus aureus is an important pathogen that leads to high morbidity and mortality. Although S. aureus produces many factors important for pathogenesis, few have been validated as playing a role in the pathogenesis of S. aureus pneumonia. To gain a better understanding of the genetic elements required for S. aureus pathogenesis in the airway, we performed an unbiased genome-wide transposon sequencing (Tn-seq) screen in a model of acute murine pneumonia. We identified 136 genes important for bacterial survival during infection, with a high proportion involved in metabolic processes. Phenotyping 80 individual deletion mutants through diverse in vitro and in vivo assays demonstrated that metabolism is linked to several processes, which include biofilm formation, growth, and resistance to host stressors. We further validated the importance of 23 mutations in pneumonia. Multivariate and principal-component analyses identified two key metabolic mechanisms enabling infection in the airway, growth (e.g., the ability to replicate and form biofilms) and resistance to host stresses. As deep validation of these hypotheses, we investigated the role of pyruvate carboxylase, which was important across multiple infection models and confirmed a connection between growth and resistance to host cell killing. Pathogenesis is conventionally understood in terms of the host-pathogen interactions that enable a pathogen to neutralize a host’s immune response. We demonstrate with the important bacterial pathogen S. aureus that microbial metabolism influences key traits important for in vivo infection, independent from host immunomodulation.
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26
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Zhang W, Cheng C, Sha Z, Chen C, Yu C, Lv N, Ji P, Wu X, Ma T, Cheng H, Shi L. Rosmarinic acid prevents refractory bacterial pneumonia through regulating Keap1/Nrf2-mediated autophagic pathway and mitochondrial oxidative stress. Free Radic Biol Med 2021; 168:247-257. [PMID: 33812997 DOI: 10.1016/j.freeradbiomed.2021.03.038] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 03/18/2021] [Accepted: 03/28/2021] [Indexed: 12/30/2022]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is the leading cause of bacterial pneumonia, featured with exuberant inflammatory cytokine production, extensive oxidative stress and tissue injury. The Keap1/Nrf2 system is the major apparatus essential for host defense against oxidative and electrophilic stresses of both exogenous and endogenous origins, representing a logical target for host-directed strategy to treat severe inflammatory diseases including MRSA-induced pneumonia. In an effort to search therapeutics for bacterial pneumonia, we identify rosmarinic acid (RA) as a covalent modifier of Keap1 and hence an activator of Nrf2. Specifically, RA forms a covalent bond with the cysteine 151 of Keap1 in BTB domain, and blocks its association with Nrf2 for proteasome-mediated degradation. Consequently, RA treatment caused the increased Nrf2 nuclear translocation to initiate antioxidant and mitochondrial biogenic programs, as well as macrophage bactericidal activity through inducing autophagic pathway, which eventually led to expedited bacterial eradication, inflammation resolution, and disease recovery. Collectively, our findings establish RA as a specific inducer of Nrf2 and show its potential to prevent MRSA pneumonia.
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Affiliation(s)
- Wei Zhang
- School of Medicine, Nanjing University of Chinese Medicine, 210046, Nanjing, China
| | - Cheng Cheng
- The First School of Clinical Medicine, The Affiliated Hospital of Nanjing University of Chinese Medicine, 210029, Nanjing, China
| | - Zhou Sha
- School of Medicine, Nanjing University of Chinese Medicine, 210046, Nanjing, China
| | - Changmai Chen
- School of Pharmacy, Fujian Medical University, Fuzhou, 350122, China; State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 100191, Beijing, China
| | - Chengtao Yu
- Collaborative Innovation Center of Jiangsu Province of Cancer Prevention and Treatment of Chinese Medicine, 210023, Nanjing, China
| | - Nianyin Lv
- School of Medicine, Nanjing University of Chinese Medicine, 210046, Nanjing, China
| | - Peng Ji
- School of Medicine, Nanjing University of Chinese Medicine, 210046, Nanjing, China
| | - Xiaohui Wu
- School of Medicine, Nanjing University of Chinese Medicine, 210046, Nanjing, China
| | - Tonghui Ma
- School of Medicine, Nanjing University of Chinese Medicine, 210046, Nanjing, China
| | - Haibo Cheng
- The First School of Clinical Medicine, The Affiliated Hospital of Nanjing University of Chinese Medicine, 210029, Nanjing, China; Collaborative Innovation Center of Jiangsu Province of Cancer Prevention and Treatment of Chinese Medicine, 210023, Nanjing, China.
| | - Liyun Shi
- School of Medicine, Nanjing University of Chinese Medicine, 210046, Nanjing, China; Collaborative Innovation Center of Jiangsu Province of Cancer Prevention and Treatment of Chinese Medicine, 210023, Nanjing, China; International Medical College, Zhejiang Shuren University, 310022, Hangzhou, China.
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27
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Tilouche L, Ben Dhia R, Boughattas S, Ketata S, Bouallegue O, Chaouch C, Boujaafar N. Staphylococcus aureus Ventilator-Associated Pneumonia: A Study of Bacterio-Epidemiological Profile and Virulence Factors. Curr Microbiol 2021; 78:2556-2562. [PMID: 33969430 PMCID: PMC8107017 DOI: 10.1007/s00284-021-02512-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 04/25/2021] [Indexed: 11/30/2022]
Abstract
Ventilator-associated pneumonia (VAP) represents a major cause of nosocomial infections in the intensive care units in which Staphylococcus aureus is frequently involved. Better knowledge of this pathogen is required in order to enhance the patient’s treatment and care. In this article, we studied the bacteriological profile and virulence factors of S. aureus-related VAP on a 3-year period. We included a collection of S. aureus strains (n = 35) isolated from respiratory samples from patients diagnosed with VAP in the intensive care units. We studied the bacteriological aspects and we searched for the presence of virulence factors (SpA, FnbpA, Hla, and PVL genes) in the strains, and we also studied the clinical and biological aspects of the infections. The average age of our patients was of 36 years and they were predominantly males (sex ratio = 3.37). A severe head trauma or a history of coma was noted in 73.43% of the patients. The average duration of ventilation was 29 days. Among the studied strains, five were Methicillin-resistant S. aureus of which three expressed the mecA gene. Overall, the Hla gene was detected in 85.7% of the strains and it was more prevalent in Methicillin-susceptible than Methicillin-resistant strains (93.3% versus 40%; P = 0.014). FnbpA, Spa, and PVL genes were detected, respectively, in 80%, 45.7%, and 20% of the strains. Therefore, our studied strains were essentially associated with the production of Hla and FnbpA genes. It is, however, important to elucidate their expression in order to establish their role in the VAP pathogenesis.
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Affiliation(s)
- Lamia Tilouche
- Department of microbiology, Sahloul University Teaching Hospital, Route de la ceinture, H.Sousse, 4011, Monastir, Tunisia.,Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia
| | - Refka Ben Dhia
- Department of microbiology, Sahloul University Teaching Hospital, Route de la ceinture, H.Sousse, 4011, Monastir, Tunisia. .,Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia.
| | - Sameh Boughattas
- Department of microbiology, Sahloul University Teaching Hospital, Route de la ceinture, H.Sousse, 4011, Monastir, Tunisia.,Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia
| | - Soumaya Ketata
- Department of microbiology, Sahloul University Teaching Hospital, Route de la ceinture, H.Sousse, 4011, Monastir, Tunisia.,Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia
| | - Olfa Bouallegue
- Department of microbiology, Sahloul University Teaching Hospital, Route de la ceinture, H.Sousse, 4011, Monastir, Tunisia.,Faculty of medicine Ibn El-Jazzar of Sousse, University of Sousse, Sousse, Tunisia
| | - Cherifa Chaouch
- Department of microbiology, Sahloul University Teaching Hospital, Route de la ceinture, H.Sousse, 4011, Monastir, Tunisia.,Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia
| | - Noureddine Boujaafar
- Department of microbiology, Sahloul University Teaching Hospital, Route de la ceinture, H.Sousse, 4011, Monastir, Tunisia.,Faculty of Pharmacy of Monastir, University of Monastir, Monastir, Tunisia
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28
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Banerji R, Saroj SD. Early growth response 1 (EGR1) activation in initial stages of host-pathogen interactions. Mol Biol Rep 2021; 48:2935-2943. [PMID: 33783681 DOI: 10.1007/s11033-021-06305-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 03/19/2021] [Indexed: 12/11/2022]
Abstract
The factors that determine the outcomes of host-pathogen interactions, such as host specificity, tissue specificity, and transition from asymptomatic to symptomatic behavior of a pathogen, are yet to be deciphered. The initial interaction of a pathogen with host and host-associated factors play a crucial role in deciding such outcomes. One of the several host-factors that contribute to bacterial adhesion and the outcome of an infection is the activation of early growth response 1 (EGR1). EGR1 is an initial response transcriptional regulator that plays a vital role in regulating cell growth, differentiation, and survival. EGR1 expression is seen in most of the mammalian tissues. Multiple post-translational modifications occur, which modulate the EGR1 transcriptional activity. Upon activation, EGR1 can transactivate several genes with diverse cellular functions, including transcriptional regulatory proteins and cell proliferation. EGR1 has also been identified as a potential mediator of inflammatory gene expression. Recent studies have highlighted the role of EGR1 as a potent signaling molecule that facilitates bacterial adhesion to host epithelial cells, thus modulating colonization pathways. The pathways for the regulation of EGR1 during host-pathogen interaction remain yet unidentified. The review focuses on the role and regulation of EGR1 during host-pathogen interaction.
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Affiliation(s)
- Rajashri Banerji
- Symbiosis School of Biological Sciences, Symbiosis International (Deemed University), Symbiosis Knowledge Village, Lavale, Pune, Maharashtra, 412115, India
| | - Sunil D Saroj
- Symbiosis School of Biological Sciences, Symbiosis International (Deemed University), Symbiosis Knowledge Village, Lavale, Pune, Maharashtra, 412115, India.
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29
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Genotypic and Phenotypic Characterization of Staphylococcus aureus Isolates from the Respiratory Tract in Mechanically-Ventilated Patients. Toxins (Basel) 2021; 13:toxins13020122. [PMID: 33562023 PMCID: PMC7915691 DOI: 10.3390/toxins13020122] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 02/03/2021] [Accepted: 02/03/2021] [Indexed: 12/17/2022] Open
Abstract
Staphylococcus aureus is a commensal and frequent colonizer of the upper respiratory tract. When mechanical ventilation disrupts natural defenses, S. aureus is frequently isolated from the lower airways, but distinguishing between colonization and infection is difficult. The objectives of this study were (1) to investigate the bacterial genome sequence in consecutive isolates in order to identify changes related to the pathological adaptation to the lower respiratory tract and (2) to explore the relationship between specific phenotypic and genotypic features with the patient’s study group, persistence of the clinical isolate and clinical outcome. A set of 94 clinical isolates were selected and corresponded to 34 patients that were classified as having pneumonia (10), tracheobronchitis (11) and bronchial colonization (13). Clinical strains were phenotypically characterized by conventional identification and susceptibility testing methods. Isolates underwent whole genome sequencing using Illumina HiSeq4000. Genotypic characterization was performed with an in-house pipeline (BacterialTyper). Genomic variation arising within-host was determined by comparing mapped sequences and de novo assemblies. Virulence factors important in staphylococcal colonization and infection were characterized using previously established functional assays. (1) Toxin production was assessed using a THP-1 cytotoxicity assay, which reports on the gross cytotoxicity of individual isolates. In addition, we investigated the expression of the major virulence factor, alpha-toxin (Hla) by Western blot. (2) Adhesion to the important extracellular matrix molecule, fibronectin, was determined using a standardized microtitre plate assay. Finally, invasion experiments using THP-1 and A539 cell lines and selected clinical strains were also performed. Repeated isolation of S. aureus from endotracheal aspirate usually reflects persistence of the same strain. Within-host variation is detectable in this setting, but it shows no evidence of pathological adaptation related to virulence, resistance or niche adaptations. Cytotoxicity was variable among isolates with 14 strains showing no cytotoxicity, with these latter presenting an unaltered Fn binding capacity. No changes on cytotoxicity were reported when comparing study groups. Fn binding capacity was reported for almost all strains, with the exception of two strains that presented the lowest values. Strains isolated from patients with pneumonia presented a lower capacity of adhesion in comparison to those isolated during tracheobronchitis (p = 0.002). Hla was detected in 71 strains (75.5%), with most of the producer strains in pneumonia and bronchial colonization group (p = 0.06). In our cohort, Hla expression (presence or absence) in sequential isolates was usually preserved (70%) although in seven cases the expression varied over time. No relationship was found between low cytotoxicity and intracellular persistence in invasion experiments. In our study population, persistent S. aureus isolation from airways in ventilated patients does not reflect pathological adaptation. There is an important diversity of sequence types. Cytotoxicity is variable among strains, but no association with study groups was found, whereas isolates from patients with pneumonia had lower adhesion capability. Favorable clinical outcome correlated with increased bacterial adhesion in vitro. Most of the strains isolated from the lower airways were Hla producers and no correlation with an adverse outcome was reported. The identification of microbial factors that contribute to virulence is relevant to optimize patient management during lower respiratory tract infections.
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30
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Fan X, Li N, Xu M, Yang D, Wang B. Intrapulmonary Vaccination Induces Long-lasting and Effective Pulmonary Immunity against Staphylococcus aureus Pneumonia. J Infect Dis 2021; 224:903-913. [PMID: 33417695 PMCID: PMC8408773 DOI: 10.1093/infdis/jiab012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 01/08/2021] [Indexed: 11/24/2022] Open
Abstract
Background Staphylococcus aureus causes community- and hospital-acquired pneumonia linked to a high mortality rate. The emergence and rapid transmission of multidrug-resistant S. aureus strains has become a serious health concern, highlighting the challenges associated with the development of a vaccine to combat S. aureus pneumonia. Methods This study evaluated the effects of intrapulmonary immunization on the immune response and protection against S. aureus lung infection in a respiratory mouse model using a subunit vaccine. Results Compared with the intranasal immunized mice, the intrapulmonarily immunized mice had lower levels of pulmonary bacterial colonization and lethality, accompanied by alleviated lung inflammation with reduced proinflammatory cytokines and increased levels of interleukin-10 and antimicrobial peptide following intrapulmonary challenge. Optimal protection was associated with increased pulmonary antibodies and resident memory T cells. Moreover, intrapulmonary immunization provided long-lasting pulmonary protection for at least 6 months, with persistent cellular and humoral immunity in the lungs. Conclusions Vaccine reaching the deep lung by intrapulmonary immunization plays a significant role in the induction of efficacious and long-lasting immunity against S. aureus in the lung parenchyma. Hence, intrapulmonary immunization can be a strategy for the development of a vaccine against S. aureus pneumonia. Immunization through the intrapulmonary route with a subunit of S. aureus vaccine elicited tissue resident memory T cells and antigen-specific antibodies in the lungs, and provided optimal and long-term protection against S. aureus pneumonia.
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Affiliation(s)
- Xin Fan
- Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Ning Li
- Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Meiyi Xu
- Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.,Savaid Medical School, University of Chinese Academy of Sciences, Beijing, China
| | - Decheng Yang
- Division of Livestock Infectious Diseases, State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Beinan Wang
- Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.,Savaid Medical School, University of Chinese Academy of Sciences, Beijing, China
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Haque M, Islam S, Sheikh MA, Dhingra S, Uwambaye P, Labricciosa FM, Iskandar K, Charan J, Abukabda AB, Jahan D. Quorum sensing: a new prospect for the management of antimicrobial-resistant infectious diseases. Expert Rev Anti Infect Ther 2020; 19:571-586. [PMID: 33131352 DOI: 10.1080/14787210.2021.1843427] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Quorum-sensing (QS) is a microbial cell-to-cell communication system that utilizes small signaling molecules to mediates interactions between cross-kingdom microorganisms, including Gram-positive and -negative microbes. QS molecules include N-acyl-homoserine-lactones (AHLs), furanosyl borate, hydroxyl-palmitic acid methylester, and methyl-dodecanoic acid. These signaling molecules maintain the symbiotic relationship between a host and the healthy microbial flora and also control various microbial virulence factors. This manuscript has been developed based on published scientific papers. AREAS COVERED Furanones, glycosylated chemicals, heavy metals, and nanomaterials are considered QS inhibitors (QSIs) and are therefore capable of inhibiting the microbial QS system. QSIs are currently being considered as antimicrobial therapeutic options. Currently, the low speed at which new antimicrobial agents are being developed impairs the treatment of drug-resistant infections. Therefore, QSIs are currently being studied as potential interventions targeting QS-signaling molecules and quorum quenching (QQ) enzymes to reduce microbial virulence. EXPERT OPINION QSIs represent a novel opportunity to combat antimicrobial resistance (AMR). However, no clinical trials have been conducted thus far assessing their efficacy. With the recent advancements in technology and the development of well-designed clinical trials aimed at targeting various components of the, QS system, these agents will undoubtedly provide a useful alternative to treat infectious diseases.
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Affiliation(s)
- Mainul Haque
- Faculty of Medicine and Defence Health, Universiti Pertahanan Nasional Malaysia (National Defence University of Malaysia), Kuala Lumpur, Malaysia
| | - Salequl Islam
- Department of Microbiology, Jahangirnagar University, Savar, Dhaka, Bangladesh
| | | | - Sameer Dhingra
- School of Pharmacy, Faculty of Medical Sciences, The University of the West Indies, St. Augustine Campus, Eric Williams Medical Sciences Complex, Trinidad & Tobago
| | - Peace Uwambaye
- Department of Preventive & Community Dentistry, University of Rwanda College of Medicine and Health Sciences, School of Dentistry, Kigali, Rwanda
| | | | - Katia Iskandar
- Department of Mathématiques Informatique et Télécommunications, Université Toulouse III, Paul Sabatier, INSERM, UMR 1027, F-31000 Toulouse, France.,INSPECT-LB: Institut National de Santé Publique, d'Épidémiologie Clinique et de Toxicologie-Liban, Beirut 6573-14, Lebanon.,Faculty of Pharmacy, Lebanese University, Beirut 1106, Lebanon
| | - Jaykaran Charan
- Department of Pharmacology, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
| | | | - Dilshad Jahan
- Department of Hematology, Asgar Ali Hospital, Dhaka, Bangladesh
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32
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Shi Y, Shi X, Liang J, Luo J, Ba J, Chen J, Wu B. Aggravated MRSA pneumonia secondary to influenza A virus infection is derived from decreased expression of IL-1β. J Med Virol 2020; 92:3047-3056. [PMID: 32697385 PMCID: PMC7692898 DOI: 10.1002/jmv.26329] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 07/15/2020] [Indexed: 12/29/2022]
Abstract
Secondary methicillin-resistant Staphylococcus aureus (MRSA) infection is a cause of severe pneumonia with high mortality during influenza A virus (IAV) pandemics. Alveolar macrophages (AMs) mount cellular defenses against IAV and MRSA infection, which occurs via the nucleotide-binding domain-like receptor protein 3 (NLRP3) inflammasome. However, the activity and function of the NLRP3 inflammasome in MRSA pneumonia secondary to IAV infection remain unclear. To clarify this, we studied MRSA infection secondary to IAV both in vitro and in mouse model. The expression of the NLRP3 inflammasome was evaluated by quantitative reverse transcription polymerase chain reaction, immunofluorescence, Western blot, and enzyme-linked immunosorbent assay. The lung pathology and the rate of weight change were observed. We found that IAV infection for 1 week activated NLRP3 inflammasome. The enhanced expression of NLRP3, caspase-1, and cleaved caspase-1 was associated with MRSA infection secondary to IAV, but the expression of interleukin (IL)-1β decreased in superinfection with MRSA both in vitro and in vivo. The aggravated inflammatory pathology in MRSA pneumonia secondary to IAV infection was associated with decreased expression of IL-1β. And increased weight loss in MRSA pneumonia secondary to IAV infection was related to decreased concentration of IL-1β in serum. It infers that superinfection with MRSA reduces expression of IL-1β someway, and decreased expression of IL-1β impairs the host immunity and leads to aggravated pneumonia. These results contributed to our understanding of the detailed activity of the NLRP3 inflammasome, IL-1β, and their relationship with aggravation of MRSA pneumonia secondary to IAV infection. Immunotherapy targeting the IL-1β signaling pathway could be possible therapeutic strategy for secondary MRSA pneumonia.
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Affiliation(s)
- Yunfeng Shi
- Medical Intensive Care Unit, Department of Respiratory and Critical Care MedicineThe Third Affiliated Hospital of Sun Yat‐Sen UniversityGuangzhouChina
- Department of Respiratory and Critical Care MedicineInstitute of Respiratory Diseases of Sun Yat‐Sen UniversityGuangzhouChina
| | - Xiaohan Shi
- Medical Intensive Care Unit, Department of Respiratory and Critical Care MedicineThe Third Affiliated Hospital of Sun Yat‐Sen UniversityGuangzhouChina
- Department of Respiratory and Critical Care MedicineInstitute of Respiratory Diseases of Sun Yat‐Sen UniversityGuangzhouChina
| | - Jingjing Liang
- Department of EmergencyThe Third Affiliated Hospital of Sun Yat‐Sen UniversityGuangzhouChina
| | - Jinmei Luo
- Medical Intensive Care Unit, Department of Respiratory and Critical Care MedicineThe Third Affiliated Hospital of Sun Yat‐Sen UniversityGuangzhouChina
- Department of Respiratory and Critical Care MedicineInstitute of Respiratory Diseases of Sun Yat‐Sen UniversityGuangzhouChina
| | - Junhui Ba
- Medical Intensive Care Unit, Department of Respiratory and Critical Care MedicineThe Third Affiliated Hospital of Sun Yat‐Sen UniversityGuangzhouChina
- Department of Respiratory and Critical Care MedicineInstitute of Respiratory Diseases of Sun Yat‐Sen UniversityGuangzhouChina
| | - Jianning Chen
- Department of PathologyThe Third Affiliated Hospital of Sun Yat‐Sen UniversityGuangzhouChina
| | - Benquan Wu
- Medical Intensive Care Unit, Department of Respiratory and Critical Care MedicineThe Third Affiliated Hospital of Sun Yat‐Sen UniversityGuangzhouChina
- Department of Respiratory and Critical Care MedicineInstitute of Respiratory Diseases of Sun Yat‐Sen UniversityGuangzhouChina
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Vlaeminck J, Raafat D, Surmann K, Timbermont L, Normann N, Sellman B, van Wamel WJB, Malhotra-Kumar S. Exploring Virulence Factors and Alternative Therapies against Staphylococcus aureus Pneumonia. Toxins (Basel) 2020; 12:toxins12110721. [PMID: 33218049 PMCID: PMC7698915 DOI: 10.3390/toxins12110721] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/12/2020] [Accepted: 11/15/2020] [Indexed: 12/13/2022] Open
Abstract
Pneumonia is an acute pulmonary infection associated with high mortality and an immense financial burden on healthcare systems. Staphylococcus aureus is an opportunistic pathogen capable of inducing S. aureus pneumonia (SAP), with some lineages also showing multidrug resistance. Given the high level of antibiotic resistance, much research has been focused on targeting S. aureus virulence factors, including toxins and biofilm-associated proteins, in an attempt to develop effective SAP therapeutics. Despite several promising leads, many hurdles still remain for S. aureus vaccine research. Here, we review the state-of-the-art SAP therapeutics, highlight their pitfalls, and discuss alternative approaches of potential significance and future perspectives.
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Affiliation(s)
- Jelle Vlaeminck
- Laboratory of Medical Microbiology, Vaccine and Infectious Diseases Institute, University of Antwerp, 2610 Antwerp, Belgium; (J.V.); (L.T.)
| | - Dina Raafat
- Department of Immunology, Institute of Immunology and Transfusion Medicine, University Medicine Greifswald, 17475 Greifswald, Germany; (D.R.); (N.N.)
- Department of Microbiology and Immunology, Faculty of Pharmacy, Alexandria University, Alexandria 21521, Egypt
| | - Kristin Surmann
- Department of Functional Genomics, Interfaculty Institute for Genetics and Functional Genomics, University Medicine Greifswald, 17475 Greifswald, Germany;
| | - Leen Timbermont
- Laboratory of Medical Microbiology, Vaccine and Infectious Diseases Institute, University of Antwerp, 2610 Antwerp, Belgium; (J.V.); (L.T.)
| | - Nicole Normann
- Department of Immunology, Institute of Immunology and Transfusion Medicine, University Medicine Greifswald, 17475 Greifswald, Germany; (D.R.); (N.N.)
| | - Bret Sellman
- Microbiome Discovery, Microbial Sciences, BioPharmaceuticals R & D, AstraZeneca, Gaithersburg, MD 20878, USA;
| | - Willem J. B. van Wamel
- Department of Medical Microbiology and Infectious Diseases, Erasmus Medical Center Rotterdam, 3015 Rotterdam, The Netherlands;
| | - Surbhi Malhotra-Kumar
- Laboratory of Medical Microbiology, Vaccine and Infectious Diseases Institute, University of Antwerp, 2610 Antwerp, Belgium; (J.V.); (L.T.)
- Correspondence: ; Tel.: +32-3-265-27-52
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Yamashita Y, Nagaoka K, Kimura H, Suzuki M, Fukumoto T, Hayasaka K, Kaku N, Morinaga Y, Yanagihara K, Konno S. Pathogenic Effect of Prevotella intermedia on a Mouse Pneumonia Model Due to Methicillin-Resistant Staphylococcus aureus With Up-Regulated α-Hemolysin Expression. Front Microbiol 2020; 11:587235. [PMID: 33117325 PMCID: PMC7575765 DOI: 10.3389/fmicb.2020.587235] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 09/14/2020] [Indexed: 11/13/2022] Open
Abstract
Background: Methicillin-resistant Staphylococcus aureus (MRSA) is a common causative agent of pneumonia; however, the detailed mechanism underlying severe MRSA pneumonia, including association with oral hygiene or periodontitis, remains poorly characterized. In this study, we examined the pathogenic effect of Prevotella intermedia, a major periodontopathic pathogen, on MRSA pneumonia. Methods: The pathogenic effect of the supernatant of P. intermedia (Pi Sup) was investigated in a murine MRSA pneumonia model, using several clinical strains; whereas the bactericidal activity of polymorphonuclear leukocytes (PMNs) was investigated in vitro. The effect of Pi Sup on messenger RNA (mRNA) expression of the toxin/quorum sensing system (rnaIII) was investigated by quantitative reverse transcription PCR both in vitro and in vivo. Results: Mice infected by hospital-acquired MRSA (HA-MRSA) with Pi Sup exhibited a significantly lower survival rate, higher bacterial loads in the lungs, and higher α-hemolysin (hla) expression in the lungs, than those without Pi Sup. A similar effect of Pi Sup was not observed with MRSA strains producing Panton-Valentine leucocidin (PVL) or toxic shock syndrome toxin (TSST). In vitro, Pi Sup suppressed bactericidal activity of PMNs against the HA-MRSA strain. HA-MRSA was the clinical strain with the highest ability to proliferate in the lungs and was accompanied by time-dependent up-regulation of rnaIII and hla. Conclusions: Our results provide novel evidence that the product of P. intermedia exerts a pathogenic effect on MRSA pneumonia, in particular with a strain exhibiting strong proliferation in the lower airway tract. Moreover, our results indicate that P. intermedia affects MRSA toxin expression via quorum sensing in a strain-dependent fashion, which might be important for understanding the pathogenesis of severe MRSA pneumonia.
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Affiliation(s)
- Yu Yamashita
- Department of Respiratory Medicine, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Kentaro Nagaoka
- Department of Respiratory Medicine, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Hiroki Kimura
- Department of Respiratory Medicine, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Masaru Suzuki
- Department of Respiratory Medicine, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Tatsuya Fukumoto
- Division of Laboratory and Transfusion Medicine, Hokkaido University Hospital, Sapporo, Japan
| | - Kasumi Hayasaka
- Division of Laboratory and Transfusion Medicine, Hokkaido University Hospital, Sapporo, Japan
| | - Norihito Kaku
- Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Yoshitomo Morinaga
- Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Katsunori Yanagihara
- Department of Laboratory Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Satoshi Konno
- Department of Respiratory Medicine, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan
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Wang Z, Chen W, Machiesky L, Sun J, Christian E, Parthemore C, Martinelli M, Lin S. Development of a mechanism of action reflective and robust potency assay for a therapeutic antibody against alpha toxin using rabbit erythrocytes. J Immunol Methods 2020; 488:112903. [PMID: 33075362 DOI: 10.1016/j.jim.2020.112903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 10/03/2020] [Accepted: 10/13/2020] [Indexed: 11/15/2022]
Affiliation(s)
- Zheng Wang
- Bioassay, Impurities & Quality, AstraZeneca, Gaithersburg, USA
| | - Weimin Chen
- Bioassay, Impurities & Quality, AstraZeneca, Gaithersburg, USA
| | | | - Jenny Sun
- Physiochemical Analytical Sciences, AstraZeneca, Gaithersburg, USA
| | | | | | | | - Shihua Lin
- Bioassay, Impurities & Quality, AstraZeneca, Gaithersburg, USA.
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Younis F, Salem E, Salem E. Respiratory health disorders associated with occupational exposure to bioaerosols among workers in poultry breeding farms. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:19869-19876. [PMID: 32227302 DOI: 10.1007/s11356-020-08485-x] [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] [Received: 01/16/2020] [Accepted: 03/16/2020] [Indexed: 06/10/2023]
Abstract
Working in poultry farms revealed the exposure to chemical and biological emissions (bioaerosols) that might be related to respiratory diseases in the workers and an increased loss in lung function. The current study aimed to determine the respiratory health status among poultry farm workers and to monitor the biological and the environmental conditions at ten poultry farms in Egypt. It reported that the total dust, ammonia (NH3), and carbon dioxide (CO2) concentrations in the studied poultry farms did not exceed the permissible exposure limits except farm V where NH3 was slightly exceeded the recommended levels. 35.7% of the poultry farm workers had positive nose and throat culture (bacterial and fungal). The poultry farm workers had higher prevalence of cough, wheeze, and shortness of breath with lower mean values of spirometric measurements than the controls (P < 0.05). Also, the positive culture poultry farm workers had significantly higher respiratory manifestations and lower spirometry values than negative culture ones (P < 0.05). Therefore, intervention programs for reducing the exposure are amendatory point for the health and safety of poultry farm workers.
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Affiliation(s)
- Faten Younis
- Public Health and Community Medicine Department, Faculty of Medicine, Menoufia University, Shebin El-kom City, Menoufia, Egypt.
| | - Eman Salem
- Medical Microbiology and Immunology Department, Faculty of Medicine, Menoufia University, Shebin El-kom City, Egypt
| | - Eman Salem
- Public Health and Community Medicine Department, Faculty of Medicine, Menoufia University, Shebin El-kom City, Menoufia, Egypt
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Characterising lipoteichoic acid as an in vitro model of acute neuroinflammation. Int Immunopharmacol 2020; 85:106619. [PMID: 32485352 DOI: 10.1016/j.intimp.2020.106619] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 04/29/2020] [Accepted: 05/17/2020] [Indexed: 01/12/2023]
Abstract
Toll-like receptor 2 (TLR2) is a primary sensor for pathogens, including those derived from gram-positive bacteria. It can also mediate the effects of endogenous inflammatory signals such as β-amyloid peptide (Aβ), thus promoting the microglial activation and subsequent neuronal dysfunction, characteristic of chronic neuroinflammatory conditions. More recently, a role for TLR2 has been proposed in the pathogenesis of disorders associated with acute inflammation, including anxiety and depression. The current study aims to characterise the acute effects of the TLR2 agonist lipoteichoic acid (LTA) on microglial activation and neuronal integrity, and to evaluate the influence of LTA exposure on sensitivity to the inflammation and neuronal dysfunction associated with Aβ. Using BV2 and N2a cells as an in vitro model, we highlight that acute exposure to LTA robustly promotes inflammatory cytokine and nitric oxide (NO) production in microglia but also in neurons, similar to that reported under longer-term and chronic inflammatory conditions. Moreover, we find that exposure to LTA can enhance sensitivity to subthreshold Aβ, promoting an 'M1'-like phenotype in microglia and provoking dysregulation of neuronal activity in acute hippocampal slices. Anti-inflammatory agents, including mimetics of brain-derived neurotrophic factor (BDNF), have proven effective at alleviating chronic neuroinflammatory complications. We further examined the effects of 7,8,3-trihydroxyflavone (7,8,3-THF), a small-molecule TrkB agonist, on LTA-induced microglial activation. We report that 7,8,3-THF can significantly ameliorate interleukin (IL)-6 and NO production in LTA-stimulated BV2 cells. Taken together, our findings offer support for exploration of TLR2 as a potential target for therapeutic intervention into acute neuroinflammatory conditions. Moreover we propose that exposure to gram-positive bacterial pathogens may promote sensitivity to the inflammatory changes characteristic of the aged brain.
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Cellular signalling pathways mediating the pathogenesis of chronic inflammatory respiratory diseases: an update. Inflammopharmacology 2020; 28:795-817. [DOI: 10.1007/s10787-020-00698-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 03/02/2020] [Indexed: 02/06/2023]
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Liu X, Mao Y, Kang Y, He L, Zhu B, Zhang W, Lu Y, Wu Q, Xu D, Shi L. MicroRNA-127 Promotes Anti-microbial Host Defense through Restricting A20-Mediated De-ubiquitination of STAT3. iScience 2020; 23:100763. [PMID: 31958753 PMCID: PMC6992901 DOI: 10.1016/j.isci.2019.100763] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/29/2019] [Accepted: 12/06/2019] [Indexed: 02/07/2023] Open
Abstract
The increasing rising of multiple drug-resistant Staphylococcus aureus has become a major public health concern, underscoring a pressing need for developing therapies essentially based on the understanding of host defensive mechanism. In the present study, we showed that microRNA (miR)-127 played a key role in controlling bacterial infection and conferred a profound protection against staphylococcal pneumonia. The protective effect of miR-127 was largely dependent on its regulation of macrophage bactericidal activity and the generation of IL-22, IL-17, and anti-microbial peptides (AMPs), the pathway primarily driven by STAT3. Importantly, we revealed that the ubiquitin-editing enzyme A20, a genuine target of miR-127, specifically interacted with and repressed K63-ubiquitination of STAT3, thereby compromising its phosphorylation upon bacterial infection. Thus, our data not only identify miR-127 as a non-coding molecule with anti-bacterial activity but also delineate an unappreciated mechanism whereby A20 regulates STAT3-driven anti-microbial signaling via modulating its ubiquitination.
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Affiliation(s)
- Xiaoyi Liu
- Department of Immunology and Medical Microbiology, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yun Mao
- Key Laboratory of Inflammation and Immunoregulation, Hangzhou Normal University School of Medicine, Hangzhou, China
| | - Yanhua Kang
- Department of Immunology and Medical Microbiology, Nanjing University of Chinese Medicine, Nanjing, China; Key Laboratory of Inflammation and Immunoregulation, Hangzhou Normal University School of Medicine, Hangzhou, China
| | - Long He
- Department of Immunology and Medical Microbiology, Nanjing University of Chinese Medicine, Nanjing, China
| | - Bo Zhu
- Department of Immunology and Medical Microbiology, Nanjing University of Chinese Medicine, Nanjing, China
| | - Wei Zhang
- Department of Immunology and Medical Microbiology, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yin Lu
- Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing, China
| | - Qinan Wu
- Collaborative Innovation Centers of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing, China
| | - Dakang Xu
- Faculty of Medical Laboratory Science, Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China; Hudson Institute of Medical Research, Department of Molecular and Translational Science, Monash University, Clayton, VIC 3800, Australia
| | - Liyun Shi
- Department of Immunology and Medical Microbiology, Nanjing University of Chinese Medicine, Nanjing, China; Key Laboratory of Inflammation and Immunoregulation, Hangzhou Normal University School of Medicine, Hangzhou, China.
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Staphylococcus aureus Pneumonia: Preceding Influenza Infection Paves the Way for Low-Virulent Strains. Toxins (Basel) 2019; 11:toxins11120734. [PMID: 31861176 PMCID: PMC6950557 DOI: 10.3390/toxins11120734] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 12/05/2019] [Accepted: 12/14/2019] [Indexed: 12/22/2022] Open
Abstract
Staphylococcus aureus is a facultative pathogenic bacterium that colonizes the nasopharyngeal area of healthy individuals, but can also induce severe infection, such as pneumonia. Pneumonia caused by mono- or superinfected S.aureus leads to high mortality rates. To establish an infection, S. aureus disposes of a wide variety of virulence factors, which can vary between clinical isolates. Our study aimed to characterize pneumonia isolates for their virulent capacity. For this, we analyzed isolates from colonization, pneumonia due to S. aureus, and pneumonia due to S. aureus/influenza virus co-infection. A total of 70 strains were analyzed for their virulence genes and the host–pathogen interaction was analyzed through functional assays in cell culture systems. Strains from pneumonia due to S. aureus mono-infection showed enhanced invasion and cytotoxicity against professional phagocytes than colonizing and co-infecting strains. This corresponded to the high presence of cytotoxic components in pneumonia strains. By contrast, strains obtained from co-infection did not exhibit these virulence characteristics and resembled strains from colonization, although they caused the highest mortality rate in patients. Taken together, our results underline the requirement of invasion and toxins to cause pneumonia due to S. aureus mono-infection, whereas in co-infection even low-virulent strains can severely aggravate pneumonia.
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Chakravarty S, Massé E. RNA-Dependent Regulation of Virulence in Pathogenic Bacteria. Front Cell Infect Microbiol 2019; 9:337. [PMID: 31649894 PMCID: PMC6794450 DOI: 10.3389/fcimb.2019.00337] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 09/18/2019] [Indexed: 12/19/2022] Open
Abstract
During infection, bacterial pathogens successfully sense, respond and adapt to a myriad of harsh environments presented by the mammalian host. This exquisite level of adaptation requires a robust modulation of their physiological and metabolic features. Additionally, virulence determinants, which include host invasion, colonization and survival despite the host's immune responses and antimicrobial therapy, must be optimally orchestrated by the pathogen at all times during infection. This can only be achieved by tight coordination of gene expression. A large body of evidence implicate the prolific roles played by bacterial regulatory RNAs in mediating gene expression both at the transcriptional and post-transcriptional levels. This review describes mechanistic and regulatory aspects of bacterial regulatory RNAs and highlights how these molecules increase virulence efficiency in human pathogens. As illustrative examples, Staphylococcus aureus, Listeria monocytogenes, the uropathogenic strain of Escherichia coli, Helicobacter pylori, and Pseudomonas aeruginosa have been selected.
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Affiliation(s)
- Shubham Chakravarty
- RNA Group, Department of Biochemistry, Faculty of Medicine and Health Sciences, CRCHUS, University of Sherbrooke, Sherbrooke, QC, Canada
| | - Eric Massé
- RNA Group, Department of Biochemistry, Faculty of Medicine and Health Sciences, CRCHUS, University of Sherbrooke, Sherbrooke, QC, Canada
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Pires S, Jacquet R, Parker D. Inducible Costimulator Contributes to Methicillin-Resistant Staphylococcus aureus Pneumonia. J Infect Dis 2019; 218:659-668. [PMID: 29378030 DOI: 10.1093/infdis/jix664] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 01/02/2018] [Indexed: 12/21/2022] Open
Abstract
Staphylococcus aureus is a major cause of both community- and healthcare-acquired pneumonias. Inducible costimulator (ICOS) is part of the CD28 family of proteins and is a target for immune checkpoint therapy. We found ICOS highly expressed on activated CD4 cells in response to S. aureus. In the absence of ICOS, mice had improved survival in a pneumonia model with the methicillin-resistant Staphylococcus aureus (MRSA) strain USA300 and significant reductions in bacterial burden in a nonlethal acute pneumonia model. Infected Icos-/- mice had major reductions in several proinflammatory cytokines, neutrophils, inflammatory monocytes, and eosinophils compared to infected wild-type mice, while there was improved expression of CD11c and macrophage receptor with collagenous structure on the surface of alveolar macrophages. Early during infection infected Icos-/- mice had increased numbers of alveolar macrophages and expression of several surface markers on alveolar macrophages and neutrophils. ICOS signaling also contributed to the pathogenesis of the airway pathogens Klebsiella pneumoniae, Pseudomonas aeruginosa, and Streptococcus pneumoniae, and neutralizing antibody to ICOS led to improved clearance of S. aureus from the airway. Our results indicate that ICOS plays a significant role in orchestrating the innate immune response to S. aureus and other airway pathogens, and could be a potential immunomodulatory target to attenuate S. aureus-related immunopathology.
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Affiliation(s)
- Silvia Pires
- Department of Pediatrics, Columbia University, New York, New York
| | - Rudy Jacquet
- Department of Pediatrics, Columbia University, New York, New York
| | - Dane Parker
- Department of Pediatrics, Columbia University, New York, New York
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Efficacy of Azithromycin in a Mouse Pneumonia Model against Hospital-Acquired Methicillin-Resistant Staphylococcus aureus. Antimicrob Agents Chemother 2019; 63:AAC.00149-19. [PMID: 31235625 DOI: 10.1128/aac.00149-19] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 06/10/2019] [Indexed: 11/20/2022] Open
Abstract
The use of macrolides against pneumonia has been reported to improve survival; however, little is known about their efficacy against methicillin-resistant Staphylococcus aureus (MRSA) pneumonia. In this study, we investigated the effect of azithromycin (AZM) and compared it with that of vancomycin (VCM) and daptomycin (DAP) in a murine model of MRSA pneumonia. Mice were infected with MRSA by intratracheal injection and then treated with AZM, VCM, or DAP. The therapeutic effect of AZM, in combination or not with the other drugs, was compared in vivo, whereas the effect of AZM on MRSA growth and toxin mRNA expression was evaluated in vitro. In vivo, the AZM-treated group showed significantly longer survival and fewer bacteria in the lungs 24 h after infection than the untreated group, as well as the other anti-MRSA drug groups. No significant decrease in cytokine levels (interleukin-6 [IL-6] and macrophage inflammatory protein-2 [MIP-2]) in bronchoalveolar lavage fluid or toxin expression levels (α-hemolysin [Hla] and staphylococcal protein A [Spa]) was observed following AZM treatment. In vitro, AZM suppressed the growth of MRSA in late log phase but not in stationary phase. No suppressive effect against toxin production was observed following AZM treatment in vitro In conclusion, contrary to the situation in vitro, AZM was effective against MRSA growth in vivo in our pneumonia model, substantially improving survival. The suppressive effect on MRSA growth at the initial stage of pneumonia could underlie the potential mechanism of AZM action against MRSA pneumonia.
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Roden L, Görlich D, Omran H, Peters G, Große-Onnebrink J, Kahl BC. A retrospective analysis of the pathogens in the airways of patients with primary ciliary dyskinesia. Respir Med 2019; 156:69-77. [PMID: 31437650 DOI: 10.1016/j.rmed.2019.08.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 08/14/2019] [Accepted: 08/14/2019] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Primary ciliary dyskinesia (PCD) is a rare genetically heterogeneous disorder of motile cilia, which leads to recurrent and chronic airway infections. Detailed information about infection causing pathogens is scarce. With this study, we aimed to determine the prevalence and susceptibility of the most common respiratory pathogens in PCD patients retrospectively in a cross-sectional and the dynamics of the microbiological diversity in a longitudinal study. METHODS Microbiological and clinical data of 106 patients between 2010 and 2016 were analysed cross-sectionally and of 28 patients longitudinally. Dynamics in microbiological diversity were assessed by calculating the mean rate of alteration (MRA). RESULTS Haemophilus influenzae was the most common pathogen (n = 41; 38.7%) followed by Staphylococcus aureus (n = 36; 34%), Moraxella catarrhalis (n = 18; 17%) and Pseudomonas aeruginosa (n = 16; 15.1%). Nontuberculous mycobacteria were cultured from two patients (1.9%). H. influenzae was the most prevalent pathogen in children (n = 31; 45.6%), S. aureus in adults (n = 15; 39%). Two patients were infected by methicillin-resistant S. aureus. P. aeruginosa was mostly susceptible to standard antibiotics with highest rates of resistance against fosfomycin (63.6%; 7/11). The culture of P. aeruginosa correlated negatively with age adjusted FEV1% predicted (p = 0.04), while the MRA was positively associated with age (rho 0.411, p = 0.032). DISCUSSION In PCD patients, the prevalence of pathogens differed in children and adults with H. influenzae and S. aureus being the most common pathogens in children, S. aureus and P. aeruginosa in adults, respectively. Unexpectedly, the MRA increased by age.
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Affiliation(s)
- Lukas Roden
- Institute of Medical Microbiology, University Hospital Münster, Germany.
| | - Dennis Görlich
- Institute of Biostatistics and Clinical Research, University Hospital Münster, Germany.
| | - Heymut Omran
- Department of General Pediatrics, University Hospital Münster, Germany.
| | - Georg Peters
- Institute of Medical Microbiology, University Hospital Münster, Germany.
| | | | - Barbara C Kahl
- Institute of Medical Microbiology, University Hospital Münster, Germany.
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Naas HT, Edarhoby RA, Garbaj AM, Azwai SM, Abolghait SK, Gammoudi FT, Moawad AA, Barbieri I, Eldaghayes IM. Occurrence, characterization, and antibiogram of Staphylococcus aureus in meat, meat products, and some seafood from Libyan retail markets. Vet World 2019; 12:925-931. [PMID: 31440015 PMCID: PMC6661493 DOI: 10.14202/vetworld.2019.925-931] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 05/13/2019] [Indexed: 11/16/2022] Open
Abstract
Aim: The aim of the current investigation was to screen the presence of Staphylococci spp., especially S. aureus in meat, meat products of different animal species, and some seafood sold in some retail markets in Libya using cultural and molecular techniques, and to study their antibiotics resistance profiles. Materials and Methods: A total of 139 samples from red meat, meat products, and seafood were collected from many areas in Libya. Enumeration and isolation of Staphylococci spp. and S. aureus by normal cultural methods followed by molecular identification using molecular techniques by bacterial DNA extraction and partial sequencing of 16S rDNA. Results: Out of 139 samples, 112 (80.6%) were contaminated with different species of Staphylococci based on cultural characteristics of Staphylococci on Baird-Parker medium, for which S. aureus was detected in only 32 samples (23%). However, only six out of 18 (33.3%) isolates sent for sequencing were confirmed to be S. aureus using the molecular technique. The six identified isolates of S. aureus were tested for antimicrobial resistance against 24 most commonly used antibiotics. All isolates were resistant to only two antibiotics (cefotaxime and clindamycin). Among these six isolates, only one confirmed to be Methicillin-resistant Staphylococcus aureus. Conclusion: Results of this study suggest that food of animal origin could be a source of S. aureus with antimicrobial resistance characteristics that can be spread through the food chain, and raise the importance of these results for public health.
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Affiliation(s)
- Hesham T Naas
- Department of Food Hygiene and Control, Faculty of Veterinary Medicine, University of Tripoli, P.O. Box 13662, Tripoli, Libya
| | - Ramadan A Edarhoby
- Department of Food Hygiene and Control, Faculty of Veterinary Medicine, University of Tripoli, P.O. Box 13662, Tripoli, Libya
| | - Aboubaker M Garbaj
- Department of Food Hygiene and Control, Faculty of Veterinary Medicine, University of Tripoli, P.O. Box 13662, Tripoli, Libya
| | - Salah M Azwai
- Department of Microbiology and Parasitology, Faculty of Veterinary Medicine, University of Tripoli, P.O. Box 13662, Tripoli, Libya
| | - Said K Abolghait
- Department of Food Hygiene and Control, Faculty of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt
| | - Fatim T Gammoudi
- Department of Microbiology and Parasitology, Faculty of Veterinary Medicine, University of Tripoli, P.O. Box 13662, Tripoli, Libya
| | - Ashraf A Moawad
- Department of Food Hygiene and Control, Faculty of Veterinary Medicine, Cairo University, 12211 Giza 12211, Egypt
| | - Ilaria Barbieri
- Department of Genetics, The Lombardy and Emilia Romagna Experimental Zootechnic Institute, Via Bianchi 9, Brescia 25124, Italy
| | - Ibrahim M Eldaghayes
- Department of Microbiology and Parasitology, Faculty of Veterinary Medicine, University of Tripoli, P.O. Box 13662, Tripoli, Libya
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Infection of Primary Human Alveolar Macrophages Alters Staphylococcus aureus Toxin Production and Activity. Infect Immun 2019; 87:IAI.00167-19. [PMID: 31010814 DOI: 10.1128/iai.00167-19] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 04/15/2019] [Indexed: 11/20/2022] Open
Abstract
Pulmonary pathogens encounter numerous insults, including phagocytic cells designed to degrade bacteria, while establishing infection in the human lung. Staphylococcus aureus is a versatile, opportunistic pathogen that can cause severe pneumonia, and methicillin-resistant isolates are of particular concern. Recent reports present conflicting data regarding the ability of S. aureus to survive and replicate within macrophages. However, due to use of multiple strains and macrophage sources, making comparisons between reports remains difficult. Here, we established a disease-relevant platform to study innate interactions between S. aureus and human lungs. Human precision-cut lung slices (hPCLS) were subjected to infection by S. aureus LAC (methicillin-resistant) or UAMS-1 (methicillin-sensitive) isolates. Additionally, primary human alveolar macrophages (hAMs) were infected with S. aureus, and antibacterial activity was assessed. Although both S. aureus isolates survived within hAM phagosomes, neither strain replicated efficiently in these cells. S. aureus was prevalent within the epithelial and interstitial regions of hPCLS, with limited numbers present in a subset of hAMs, suggesting that the pathogen may not target phagocytic cells for intracellular growth during natural pulmonary infection. S. aureus-infected hAMs mounted a robust inflammatory response that reflected natural human disease. S. aureus LAC was significantly more cytotoxic to hAMs than UAMS-1, potentially due to isolate-specific virulence factors. The bicomponent toxin Panton-Valentine leukocidin was not produced during intracellular infection, while alpha-hemolysin was produced but was not hemolytic, suggesting that hAMs alter toxin activity. Overall, this study defined a new disease-relevant infection platform to study S. aureus interaction with human lungs and to define virulence factors that incapacitate pulmonary cells.
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S. aureus Evades Macrophage Killing through NLRP3-Dependent Effects on Mitochondrial Trafficking. Cell Rep 2019; 22:2431-2441. [PMID: 29490278 PMCID: PMC7160668 DOI: 10.1016/j.celrep.2018.02.027] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 01/05/2018] [Accepted: 02/06/2018] [Indexed: 12/28/2022] Open
Abstract
Clinical severity of Staphylococcus aureus respiratory infection correlates with alpha toxin (AT) expression. AT activates the NLRP3 inflammasome; deletion of Nlrp3, or AT neutralization, protects mice from lethal S. aureus pneumonia. We tested the hypothesis that this protection is not due to a reduction in inflammasome-dependent cytokines (IL-1β/IL-18) but increased bactericidal function of macrophages. In vivo, neutralization of AT or NLRP3 improved bacterial clearance and survival, while blocking IL-1β/IL-18 did not. Primary human monocytes were used in vitro to determine the mechanism through which NLRP3 alters bacterial killing. In cells treated with small interfering RNA (siRNA) targeting NLRP3 or infected with AT-null S. aureus, mitochondria co-localize with bacterial-containing phagosomes. Mitochondrial engagement activates caspase-1, a process dependent on complex II of the electron transport chain, near the phagosome, promoting its acidification. These data demonstrate a mechanism utilized by S. aureus to sequester itself from antimicrobial processes within the cell.
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Abstract
Community-acquired pneumonia (CAP) is a leading cause of morbidity and mortality worldwide. Despite broad literature including basic and translational scientific studies, many gaps in our understanding of host-pathogen interactions remain. In this review, pathogen virulence factors that drive lung infection and injury are discussed in relation to their associated host immune pathways. CAP epidemiology is considered, with a focus on Staphylococcus aureus and Streptococcus pneumoniae as primary pathogens. Bacterial factors involved in nasal colonization and subsequent virulence are illuminated. A particular emphasis is placed on bacterial pore-forming toxins, host cell death, and inflammasome activation. Identified host-pathogen interactions are then examined by linking pathogen factors to aberrant host response pathways in the context of acute lung injury in both primary and secondary infection. While much is known regarding bacterial virulence and host immune responses, CAP management is still limited to mostly supportive care. It is likely that improvements in therapy will be derived from combinatorial targeting of both pathogen virulence factors and host immunomodulation.
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Ansari S, Jha RK, Mishra SK, Tiwari BR, Asaad AM. Recent advances in Staphylococcus aureus infection: focus on vaccine development. Infect Drug Resist 2019; 12:1243-1255. [PMID: 31190912 PMCID: PMC6526327 DOI: 10.2147/idr.s175014] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 04/19/2019] [Indexed: 12/17/2022] Open
Abstract
Staphylococcus aureus normally colonizes the nasal cavity and pharynx. After breaching the normal habitat, the organism is able to cause a number of infections at any site of the body. The development of antibiotic resistance has created a global challenge for treating infections. Therefore, protection by vaccines may provide valuable measures. Currently, several vaccine candidates have been prepared which are either in preclinical phase or in early clinical phase, whereas several candidates have failed to show a protective efficacy in human subjects. Approaches have also been made in the development of monoclonal or polyclonal antibodies for passive immunization to protect from S. aureus infections. Therefore, in this review we have summarized the findings of recently published scientific literature to make a concise report.
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Affiliation(s)
- Shamshul Ansari
- Department of Microbiology, Chitwan Medical College and Teaching Hospital, Bharatpur, Chitwan, Nepal
| | - Rajesh Kumar Jha
- Department of Systems and Diseases (Pharmacology), Saba University School of Medicine, Saba, Dutch Caribbean
| | - Shyam Kumar Mishra
- Department of Microbiology, Maharajgunj Medical Campus, Institute of Medicine, Tribhuvan University, Kathmandu, Nepal
| | | | - Ahmed Morad Asaad
- Department of Microbiology, Faculty of Medicine, Zagazig University, Zagazig, Egypt
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50
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Spolski R, West EE, Li P, Veenbergen S, Yung S, Kazemian M, Oh J, Yu ZX, Freeman AF, Holland SM, Murphy PM, Leonard WJ. IL-21/type I interferon interplay regulates neutrophil-dependent innate immune responses to Staphylococcus aureus. eLife 2019; 8:45501. [PMID: 30969166 PMCID: PMC6504231 DOI: 10.7554/elife.45501] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 04/09/2019] [Indexed: 12/24/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is a major hospital- and community-acquired pathogen, but the mechanisms underlying host-defense to MRSA remain poorly understood. Here, we investigated the role of IL-21 in this process. When administered intra-tracheally into wild-type mice, IL-21 induced granzymes and augmented clearance of pulmonary MRSA but not when neutrophils were depleted or a granzyme B inhibitor was added. Correspondingly, IL-21 induced MRSA killing by human peripheral blood neutrophils. Unexpectedly, however, basal MRSA clearance was also enhanced when IL-21 signaling was blocked, both in Il21r KO mice and in wild-type mice injected with IL-21R-Fc fusion-protein. This correlated with increased type I interferon and an IFN-related gene signature, and indeed anti-IFNAR1 treatment diminished MRSA clearance in these animals. Moreover, we found that IFNβ induced granzyme B and promoted MRSA clearance in a granzyme B-dependent fashion. These results reveal an interplay between IL-21 and type I IFN in the innate immune response to MRSA.
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Affiliation(s)
- Rosanne Spolski
- Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States.,Immunology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Erin E West
- Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States.,Immunology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Peng Li
- Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States.,Immunology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Sharon Veenbergen
- Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Sunny Yung
- Laboratory of Molecular Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, United States
| | - Majid Kazemian
- Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States.,Immunology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Jangsuk Oh
- Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States.,Immunology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Zu-Xi Yu
- The Pathology Core, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Alexandra F Freeman
- Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, United States
| | - Stephen M Holland
- Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, United States
| | - Philip M Murphy
- Laboratory of Molecular Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, United States
| | - Warren J Leonard
- Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States.,Immunology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, United States
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