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Larsen TG, Samaniego Castruita JA, Worning P, Westh H, Bartels MD. Within-host genomic evolution of methicillin-resistant Staphylococcus aureus in long-term carriers. Appl Microbiol Biotechnol 2024; 108:95. [PMID: 38212970 PMCID: PMC10784349 DOI: 10.1007/s00253-023-12932-3] [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: 08/01/2023] [Revised: 11/14/2023] [Accepted: 11/27/2023] [Indexed: 01/13/2024]
Abstract
Assessing the genomic evolution of Staphylococcus aureus can help us understand how the bacteria adapt to its environment. In this study, we aimed to assess the mutation rate within 144 methicillin-resistant Staphylococcus aureus (MRSA) carriers with a carriage time from 4 to 11 years, including some carriers who belonged to the same households. We found that 23 of the 144 individuals had completely different MRSA types over time and were therefore not long-term carriers of the same MRSA. From the remaining 121 individuals, we performed whole-genome sequencing (WGS) on 424 isolates and then compared these pairwise using core genome multilocus sequence typing (cgMLST) and single-nucleotide polymorphism (SNP) analyses. We found a median within-host mutation rate in long-term MRSA carriers of 4.9 (3.4-6.9) SNPs/genome/year and 2.7 (1.8-4.2) allelic differences/genome/year, when excluding presumed recombination. Furthermore, we stratified the cohort into subgroups and found no significant difference between the median mutation rate of members of households, individuals with presumed continued exposure, e.g., from travel and persons without known continued exposure. Finally, we found that SNPs occurred at random within the genes in our cohort. KEY POINTS: • Median mutation rate within long-term MRSA carriers of 4.9 (3.4-6.9) SNPs/genome/year • Similar median mutation rates in subgroups (households, travelers) • No hotspots for SNPs within the genome.
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Affiliation(s)
- Tine Graakjær Larsen
- Department of Clinical Microbiology, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark
- Department of Infectious Disease Epidemiology and Prevention, Statens Serum Institut, Copenhagen, Denmark
| | | | - Peder Worning
- Department of Clinical Microbiology, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark
| | - Henrik Westh
- Department of Clinical Microbiology, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| | - Mette Damkjær Bartels
- Department of Clinical Microbiology, Copenhagen University Hospital - Amager and Hvidovre, Copenhagen, Denmark.
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.
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Chatterjee S, Leach ST, Lui K, Mishra A. Symbiotic symphony: Understanding host-microbiota dialogues in a spatial context. Semin Cell Dev Biol 2024; 161-162:22-30. [PMID: 38564842 DOI: 10.1016/j.semcdb.2024.03.001] [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: 10/31/2023] [Revised: 02/23/2024] [Accepted: 03/20/2024] [Indexed: 04/04/2024]
Abstract
Modern precision sequencing techniques have established humans as a holobiont that live in symbiosis with the microbiome. Microbes play an active role throughout the life of a human ranging from metabolism and immunity to disease tolerance. Hence, it is of utmost significance to study the eukaryotic host in conjunction with the microbial antigens to obtain a complete picture of the host-microbiome crosstalk. Previous attempts at profiling host-microbiome interactions have been either superficial or been attempted to catalogue eukaryotic transcriptomic profile and microbial communities in isolation. Additionally, the nature of such immune-microbial interactions is not random but spatially organised. Hence, for a holistic clinical understanding of the interplay between hosts and microbiota, it's imperative to concurrently analyze both microbial and host genetic information, ensuring the preservation of their spatial integrity. Capturing these interactions as a snapshot in time at their site of action has the potential to transform our understanding of how microbes impact human health. In examining early-life microbial impacts, the limited presence of communities compels analysis within reduced biomass frameworks. However, with the advent of spatial transcriptomics we can address this challenge and expand our horizons of understanding these interactions in detail. In the long run, simultaneous spatial profiling of host-microbiome dialogues can have enormous clinical implications especially in gaining mechanistic insights into the disease prognosis of localised infections and inflammation. This review addresses the lacunae in host-microbiome research and highlights the importance of profiling them together to map their interactions while preserving their spatial context.
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Affiliation(s)
- Soumi Chatterjee
- Telethon Kids Institute, Perth Children Hospital, Perth, Western Australia 6009, Australia; Curtin Medical School, Curtin University, Perth, Western Australia 6102, Australia
| | - Steven T Leach
- Discipline Paediatrics, School of Clinical Medicine, University of New South Wales, Sydney 2052, Australia
| | - Kei Lui
- Department of Newborn Care, Royal Hospital for Women and Discipline of Paediatrics and Child Health, School of Clinical Medicine, Faculty of Medicine, University of New South Wales, Sydney 2052, Australia
| | - Archita Mishra
- Telethon Kids Institute, Perth Children Hospital, Perth, Western Australia 6009, Australia; Curtin Medical School, Curtin University, Perth, Western Australia 6102, Australia.
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Xu Q, Yang S, Zhang K, Liu Y, Li L, Qu S. Enhanced antibacterial activity of bovine milk exosome-based drug formulation against bacterial pathogens. Food Chem 2024; 447:139034. [PMID: 38493686 DOI: 10.1016/j.foodchem.2024.139034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 02/25/2024] [Accepted: 03/11/2024] [Indexed: 03/19/2024]
Abstract
Milk is not only a source of nutrients, but also contains exosomes (Exo) that can serve as a vehicle for drug delivery. Here, we obtained bovine milk Exo using three efficient methods, demonstrating high quality for commercial production. The optimized Exo displayed a size of 105.2 nm and an entrapment efficiency of 88.4 %. The Exo has been functionalized with a combination therapy comprising isobavachalcone (IS) and polymyxin B (PB), referred to as IP-Exo. The antibacterial efficacy of IP-Exo was significantly enhanced, enabling the elimination of 99 % of multidrug-resistant (MDR) bacterial pathogens in 4 h. Furthermore, scanning electron microscopy images demonstrated that the drug combination led to the complete dismantling of the bacterial structure. IP-Exo showed nearly 100 % microbial inhibition in fresh orange juice and accelerated wound healing in mouse models. Collectively, IP-Exo provides excellent potential for application within the food industry and animal husbandry as a defense against bacterial pathogens.
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Affiliation(s)
- Qingjun Xu
- Animal-Derived Food Safety Innovation Team, College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Shuo Yang
- Animal-Derived Food Safety Innovation Team, College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Kai Zhang
- Animal-Derived Food Safety Innovation Team, College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China
| | - Ying Liu
- Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Lin Li
- Animal-Derived Food Safety Innovation Team, College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China.
| | - Shaoqi Qu
- Animal-Derived Food Safety Innovation Team, College of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China; Joint Research Center for Food Nutrition and Health of IHM, Anhui Agricultural University, Hefei 230036, China.
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Wen Z, Chen C, Shang Y, Fan K, Li P, Li C, Zheng J, Deng Q, Yu Z. Baohuoside I inhibits virulence of multidrug-resistant Staphylococcus aureus by targeting the transcription Staphylococcus accessory regulator factor SarZ. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 130:155590. [PMID: 38810547 DOI: 10.1016/j.phymed.2024.155590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 03/28/2024] [Accepted: 04/02/2024] [Indexed: 05/31/2024]
Abstract
BACKGROUND Staphylococcus aureus is a versatile pathogen that can cause a wide range of infections in humans. Biofilms play a crucial role in the pathogenicity of S. aureus and contribute to its ability to cause persistent and chronic infections. Baohuoside I has garnered increasing recognition as a natural flavonol glycoside with a wide spectrum of health-related activities. PURPOSE The antibacterial and anti-biofilm properties of Baohuoside I have not been extensively investigated. Our study aimed to assess its inhibitory effects and the underlying mechanisms on biofilm formation and hemolytic capacity in S. aureus. STUDY DESIGN/METHODS The impact of Baohuoside I on the biofilm and virulence of S. aureus was evaluated through in vitro experiments and Galleria mellonella as an in vivo infection model. The mechanisms were explored by Drug affinity responsive target stability (DARTS) and validated in genetic knockout strain and through molecular biological experiments using DARTS, molecular docking, electrophoretic mobility shift assay (EMSA), and bio-layer interferometry (BLI). RESULTS Baohuoside I significantly inhibits the formation of S. aureus biofilms and hemolytic activity at 6.25 µM. Proteomics analysis revealed that treatment with Baohuoside I led to a reduction in the expression of quorum-sensing system agr-regulated genes. DARTS analysis identified Staphylococcus accessory regulator factor (SarZ), a key regulator involved in the expression of virulence factors in S. aureus by acting as activator of the agr quorum-sensing system, was the direct target of Baohuoside I. Molecular docking, DARTS, BLI and EMSA assays collectively confirmed the direct binding of Baohuoside I to SarZ, inhibiting its binding to downstream promoters. Furthermore, it is found through site-directed protein mutagenesis that the Tyr27 and Phe117 residues are key for Baohuoside I binding to SarZ. Additionally, the knockout of SarZ significantly diminished the hemolytic ability of S. aureus, underscoring its crucial role as a pivotal regulator of virulence. Lastly, in vivo tests utilizing the G. mellonella infection model demonstrated the efficacy of Baohuoside I. CONCLUSION This study provides valuable insights into the mechanism by which Baohuoside I inhibits the virulence of S. aureus through its interaction with SarZ. These findings highlight the significance of SarZ as an effective target against the virulence of S. aureus.
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Affiliation(s)
- Zewen Wen
- Department of Infectious Diseases and Shenzhen Key Laboratory for Endogenous Infections, Huazhong University of Science and Technology Union Shenzhen Hospital, No. 89 Taoyuan Road, Nanshan District, Shenzhen 518052, China
| | - Chengchun Chen
- Department of Infectious Diseases and Shenzhen Key Laboratory for Endogenous Infections, Huazhong University of Science and Technology Union Shenzhen Hospital, No. 89 Taoyuan Road, Nanshan District, Shenzhen 518052, China
| | - Yongpeng Shang
- Department of Infectious Diseases and Shenzhen Key Laboratory for Endogenous Infections, Huazhong University of Science and Technology Union Shenzhen Hospital, No. 89 Taoyuan Road, Nanshan District, Shenzhen 518052, China
| | - Kewei Fan
- Department of Infectious Diseases and Shenzhen Key Laboratory for Endogenous Infections, Huazhong University of Science and Technology Union Shenzhen Hospital, No. 89 Taoyuan Road, Nanshan District, Shenzhen 518052, China
| | - Peiyu Li
- Department of Infectious Diseases and Shenzhen Key Laboratory for Endogenous Infections, Huazhong University of Science and Technology Union Shenzhen Hospital, No. 89 Taoyuan Road, Nanshan District, Shenzhen 518052, China
| | - Congcong Li
- Department of Infectious Diseases and Shenzhen Key Laboratory for Endogenous Infections, Huazhong University of Science and Technology Union Shenzhen Hospital, No. 89 Taoyuan Road, Nanshan District, Shenzhen 518052, China
| | - Jinxin Zheng
- Department of Infectious Diseases and Shenzhen Key Laboratory for Endogenous Infections, Huazhong University of Science and Technology Union Shenzhen Hospital, No. 89 Taoyuan Road, Nanshan District, Shenzhen 518052, China
| | - Qiwen Deng
- Department of Infectious Diseases and Shenzhen Key Laboratory for Endogenous Infections, Huazhong University of Science and Technology Union Shenzhen Hospital, No. 89 Taoyuan Road, Nanshan District, Shenzhen 518052, China.
| | - Zhijian Yu
- Department of Infectious Diseases and Shenzhen Key Laboratory for Endogenous Infections, Huazhong University of Science and Technology Union Shenzhen Hospital, No. 89 Taoyuan Road, Nanshan District, Shenzhen 518052, China.
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Zhuang H, Chen M, Hu D, Liu L, Wu D, Zhang H, Wang Z, Jiang S, Chen Y, Zhu F, Hong Y, Lei T, Wang H, Sun L, Ji S, Yu Y, Chen Y. Role of tcaA, a potential target as a ceftobiprole resistance breaker in MRSA β-lactam resistance. Int J Antimicrob Agents 2024; 64:107185. [PMID: 38692492 DOI: 10.1016/j.ijantimicag.2024.107185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 04/02/2024] [Accepted: 04/24/2024] [Indexed: 05/03/2024]
Abstract
OBJECTIVES Using a random forest algorithm, we previously found that teicoplanin-associated gene A (tcaA) might play a role in resistance of methicillin-resistant Staphylococcus aureus (MRSA) to β-lactams, which we have investigated further here. METHODS Representative MRSA strains of prevalent clones were selected to identify the role of tcaA in the MRSA response to β-lactams. tcaA genes were deleted by homologous recombination in the selected MRSA strains, and antibiotic susceptibility tests were applied to evaluate the effect of tcaA on the minimum inhibitory concentrations (MICs) of glycopeptides and β-lactams. Scanning electron microscopy, RNA sequencing, and quantitative reverse transcription-polymerase chain reaction were performed to explore the mechanism of tcaA in MRSA resistance to β-lactams. RESULTS The MIC of penicillin plus clavulanate decreased from 3 mg/L to 0.064 mg/L and that of oxacillin decreased from 16 to 0.5 mg/L when tcaA was knocked out in the LAC strain. Compared with wild-type MRSA isolates, when tcaA was deleted, all selected strains were more susceptible to β-lactams. Susceptibility to ceftobiprole was restored in the ceftobiprole-resistant strain when tcaA was deleted. tcaA knockout caused "log-like" abnormal division of MRSA, and tcaA deficiency mediated low expression of mecA, ponA, and murA2. CONCLUSIONS Machine learning is a reliable tool for identifying drug resistance-related genes. tcaA may be involved in S. aureus cell division and may affect mecA, ponA, and murA2 expression. Furthermore, tcaA is a potential resistance breaker target for β-lactams, including ceftobiprole, in MRSA.
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Affiliation(s)
- Hemu Zhuang
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Department of Respiratory and Critical Medicine, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Mengzhen Chen
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Dongping Hu
- Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Department of Infectious Disease, Affiliated Dongyang Hospital of Wenzhou Medical University, Dongyang, Zhejiang, China
| | - Lin Liu
- Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Department of Infectious Diseases, Center for General Practice Medicine, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Dandan Wu
- Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Department of Infectious Diseases, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Hao Zhang
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Zhengan Wang
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Shengnan Jiang
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Yiyi Chen
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Feiteng Zhu
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Yueqin Hong
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Tailong Lei
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Haiping Wang
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Lu Sun
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Shujuan Ji
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Yunsong Yu
- Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Department of Infectious Diseases, Center for General Practice Medicine, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou, Zhejiang, China.
| | - Yan Chen
- Department of Infectious Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China; Key Laboratory of Microbial Technology and Bioinformatics of Zhejiang Province, Hangzhou, Zhejiang, China; Regional Medical Center for National Institute of Respiratory Diseases, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China.
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Plumet L, Magnan C, Ahmad-Mansour N, Sotto A, Lavigne JP, Costechareyre D, Kissa K, Molle V. The zebrafish embryo model: unveiling its potential for investigating phage therapy against methicillin-resistant Staphylococcus aureus infection. Antimicrob Agents Chemother 2024:e0056124. [PMID: 38899926 DOI: 10.1128/aac.00561-24] [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: 04/19/2024] [Accepted: 05/24/2024] [Indexed: 06/21/2024] Open
Abstract
Staphylococcus aureus is a pathogenic bacterium responsible for a broad spectrum of infections, including cutaneous, respiratory, osteoarticular, and systemic infections. It poses a significant clinical challenge due to its ability to develop antibiotic resistance. This resistance limits therapeutic options, increases the risk of severe complications, and underscores the urgent need for new strategies to address this threat, including the investigation of treatments complementary to antibiotics. The evaluation of novel antimicrobial agents often employs animal models, with the zebrafish embryo model being particularly interesting for studying host-pathogen interactions, establishing itself as a crucial tool in this field. For the first time, this study presents a zebrafish embryo model for the in vivo assessment of bacteriophage efficacy against S. aureus infection. A localized infection was induced by microinjecting either methicillin-resistant S. aureus (MRSA) or methicillin-susceptible S. aureus (MSSA). Subsequent treatments involved administering either bacteriophage, vancomycin (the reference antibiotic for MRSA), or a combination of both via the same route to explore potential synergistic effects. Our findings indicate that the bacteriophage was as effective as vancomycin in enhancing survival rates, whether used alone or in combination. Moreover, bacteriophage treatment appears to be even more effective in reducing the bacterial load in S. aureus-infected embryos post-treatment than the antibiotic. Our study validates the use of the zebrafish embryo model and highlights its potential as a valuable tool in assessing bacteriophage efficacy treatments in vivo.
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Affiliation(s)
- Lucile Plumet
- VBIC, INSERM U1047, University of Montpellier, Montpellier, France
| | - Chloé Magnan
- VBIC, INSERM U1047, Department of Microbiology and Hospital Hygiene, CHU Nîmes, University of Montpellier, Nîmes, France
| | | | - Albert Sotto
- VBIC, INSERM U1047, Department of Infectious Diseases, CHU Nîmes, University of Montpellier, Nîmes, France
| | - Jean-Philippe Lavigne
- VBIC, INSERM U1047, Department of Microbiology and Hospital Hygiene, CHU Nîmes, University of Montpellier, Nîmes, France
| | | | - Karima Kissa
- VBIC, INSERM U1047, University of Montpellier, Montpellier, France
| | - Virginie Molle
- VBIC, INSERM U1047, University of Montpellier, Montpellier, France
- VBIC, INSERM U1047, Department of Microbiology and Hospital Hygiene, CHU Nîmes, University of Montpellier, Nîmes, France
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7
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Fowler VG, Das AF, Lipka-Diamond J, Ambler JE, Schuch R, Pomerantz R, Cassino C, Jáuregui-Peredo L, Moran GJ, Rupp ME, Lachiewicz AM, Kuti JL, Wise RA, Kaye KS, Zervos MJ, Nichols WG. Exebacase in Addition to Standard-of-Care Antibiotics for Staphylococcus aureus Bloodstream Infections and Right-Sided Infective Endocarditis: A Phase 3, Superiority-Design, Placebo-Controlled, Randomized Clinical Trial (DISRUPT). Clin Infect Dis 2024; 78:1473-1481. [PMID: 38297916 DOI: 10.1093/cid/ciae043] [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: 11/06/2023] [Revised: 01/08/2024] [Accepted: 01/19/2024] [Indexed: 02/02/2024] Open
Abstract
BACKGROUND Novel treatments are needed for Staphylococcus aureus bacteremia, particularly for methicillin-resistant S. aureus (MRSA). Exebacase is a first-in-class antistaphylococcal lysin that is rapidly bactericidal and synergizes with antibiotics. METHODS In Direct Lysis of Staph Aureus Resistant Pathogen Trial of Exebacase (DISRUPT), a superiority-design phase 3 study, patients with S. aureus bacteremia/endocarditis were randomly assigned to receive a single dose of intravenous exebacase or placebo in addition to standard-of-care antibiotics. The primary efficacy outcome was clinical response at day 14 in the MRSA population. RESULTS A total of 259 patients were randomized before the study was stopped for futility based on the recommendation of the unblinded Data Safety Monitoring Board. Clinical response rates at day 14 in the MRSA population (n = 97) were 50.0% (exebacase + antibiotics; 32/64) versus 60.6% (antibiotics alone; 20/33) (P = .392). Overall, rates of adverse events were similar across groups. No adverse events of hypersensitivity related to exebacase were reported. CONCLUSIONS Exebacase + antibiotics failed to improve clinical response at day 14 in patients with MRSA bacteremia/endocarditis. This result was unexpected based on phase 2 data that established proof-of-concept for exebacase + antibiotics in patients with MRSA bacteremia/endocarditis. In the antibiotics-alone group, the clinical response rate was higher than that seen in phase 2. Heterogeneity within the study population and a relatively small sample size in either the phase 2 or phase 3 studies may have increased the probability of imbalances in the multiple components of day 14 clinical outcome. This study provides lessons for future superiority studies in S. aureus bacteremia/endocarditis. Clinical Trials Registration.NCT04160468.
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Affiliation(s)
- Vance G Fowler
- Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA
| | - Anita F Das
- AD Stat Consulting, Guerneville, California, USA
| | | | | | | | | | - Cara Cassino
- Stony Point Life Sciences Consulting, Benson, Vermont, USA
| | - Luis Jáuregui-Peredo
- Department of Medicine, Mercy Health-St. Vincent Medical Center, Toledo, Ohio, USA
| | - Gregory J Moran
- Department of Medicine, Olive View-UCLA Medical Center, Sylmar, California, USA
| | - Mark E Rupp
- Department of Medicine, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Anne M Lachiewicz
- Department of Medicine, University of North Carolina Health Care System, Chapel Hill, North Carolina, USA
| | - Joseph L Kuti
- Department of Medicine, Hartford Hospital, Hartford, Connecticut, USA
| | - Robert A Wise
- Department of Medicine, Johns Hopkins Bayview Medical Center, Baltimore, Maryland, USA
| | - Keith S Kaye
- Department of Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, New Jersey, USA
| | - Marcus J Zervos
- Department of Medicine, Henry Ford Health System, Detroit, Michigan, USA
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Doppalapudi S, Adrish M. Community-acquired pneumonia: The importance of the early detection of drug-resistant organisms. World J Crit Care Med 2024; 13:91314. [PMID: 38855277 PMCID: PMC11155498 DOI: 10.5492/wjccm.v13.i2.91314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 03/14/2024] [Accepted: 04/22/2024] [Indexed: 06/03/2024] Open
Abstract
Pneumonia is a disease associated with significant healthcare burden with over 1.5 million hospitalizations annually and is the eighth leading cause of death in the United States. While community-acquired pneumonia (CAP) is generally considered an acute time-limited illness, it is associated with high long-term mortality, with nearly one-third of patients requiring hospitalization dying within one year. An increasing trend of detecting multidrug-resistant (MDR) organisms causing CAP has been observed, especially in the Western world. In this editorial, we discuss about a publication by Jatteppanavar et al which reported that a case of a MDR organism was the culprit in developing pneumonia, bacteremia, and infective endocarditis that led to the patient's death. The early detection of these resistant organisms helps improve patient outcomes. Significant advances have been made in the biotechnological and research space, but preventive measures, diagnostic techniques, and treatment strategies need to be developed.
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Affiliation(s)
- Sai Doppalapudi
- Department of Medicine, Bronx Care Health System, New York Affiliated with The Icahn School of Medicine at Mount Sinai, Bronx, NY 10457, United States
| | - Muhammad Adrish
- Section of Pulmonary, Critical Care, and Sleep Medicine, Baylor College of Medicine, Houston, TX 77030, United States
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Bai Y, Zhang W, Zheng W, Meng XZ, Duan Y, Zhang C, Chen F, Wang KJ. A 14-amino acid cationic peptide Bolespleenin 334-347 from the marine fish mudskipper Boleophthalmus pectinirostris exhibiting potent antimicrobial activity and therapeutic potential. Biochem Pharmacol 2024:116344. [PMID: 38852647 DOI: 10.1016/j.bcp.2024.116344] [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: 02/07/2024] [Revised: 06/04/2024] [Accepted: 06/06/2024] [Indexed: 06/11/2024]
Abstract
Antimicrobial peptides (AMPs) are an important component of innate immunity in both vertebrates and invertebrates, and some of the unique characteristics of AMPs are usually associated with their living environment. The marine fish, mudskipper Boleophthalmus pectinirostris, usually live amphibiously in intertidal environments that are quite different from other fish species, which would be an exceptional source of new AMPs. In the study, an AMP named Bolespleenin334-347 was identified, which was a truncated peptide derived from a new functional gene found in B. pectinirostris, that was up-regulated in response to bacterial challenge. Bolespleenin334-347 had only 14 amino acid residues, including five consecutive arginine residues. It was found that the peptide had broad-spectrum antibacterial activity, good thermal stability and sodium ion tolerance. Bolespleenin334-347 killed Acinetobacter baumannii and Staphylococcus aureus by disrupting the structural integrity of the bacterial membrane, leading to leakage of the cellular contents, and inducing accumulation of bacterial endogenous reactive oxygen species (ROS). In addition, Bolespleenin334-347 effectively inhibited biofilm formation of A. baumannii and S. aureus and long-term treatment did not lead to the development of resistance. Importantly, Bolespleenin334-347 maintained stable activity against clinically multi-drug resistant bacterial strains. In addition, it was noteworthy that Bolespleenin334-347 showed superior efficacy to LL-37 and vancomycin in a constructed mouse model of MRSA-induced superficial skin infections, as evidenced by a significant reduction in bacterial load and more favorable wound healing. This study provides an effective antimicrobial agent for topical skin infections with potential therapeutic efficacy for infections with drug-resistant bacteria, including MRSA.
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Affiliation(s)
- Yuqi Bai
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, Fujian, China
| | - Weibin Zhang
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, Fujian, China
| | - Wenbin Zheng
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, Fujian, China
| | - Xin-Zhan Meng
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, Fujian, China
| | - Yingyi Duan
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, Fujian, China
| | - Chang Zhang
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, Fujian, China
| | - Fangyi Chen
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, Fujian, China; State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology, College of Ocean & Earth Sciences, Xiamen University, Xiamen, Fujian, China; Fujian Innovation Research Institute for Marine Biological Antimicrobial Peptide Industrial Technology, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China.
| | - Ke-Jian Wang
- State Key Laboratory of Marine Environmental Science, College of Ocean & Earth Sciences, Xiamen University, Xiamen, Fujian, China; State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology, College of Ocean & Earth Sciences, Xiamen University, Xiamen, Fujian, China; Fujian Innovation Research Institute for Marine Biological Antimicrobial Peptide Industrial Technology, College of Ocean & Earth Sciences, Xiamen University, Xiamen, China.
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10
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Jepsen SD, Lund A, Matwiejuk M, Andresen L, Christensen KR, Skov S. Human milk oligosaccharides regulate human macrophage polarization and activation in response to Staphylococcus aureus. Front Immunol 2024; 15:1379042. [PMID: 38903508 PMCID: PMC11187579 DOI: 10.3389/fimmu.2024.1379042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Accepted: 05/08/2024] [Indexed: 06/22/2024] Open
Abstract
Human milk oligosaccharides (HMOs) are present in high numbers in milk of lactating women. They are beneficial to gut health and the habitant microbiota, but less is known about their effect on cells from the immune system. In this study, we investigated the direct effect of three structurally different HMOs on human derived macrophages before challenge with Staphylococcus aureus (S. aureus). The study demonstrates that individual HMO structures potently affect the activation, differentiation and development of monocyte-derived macrophages in response to S. aureus. 6´-Sialyllactose (6'SL) had the most pronounced effect on the immune response against S. aureus, as illustrated by altered expression of macrophage surface markers, pointing towards an activated M1-like macrophage-phenotype. Similarly, 6'SL increased production of the pro-inflammatory cytokines TNF-α, IL-6, IL-8, IFN-γ and IL-1β, when exposing cells to 6'SL in combination with S. aureus compared with S. aureus alone. Interestingly, macrophages treated with 6'SL exhibited an altered proliferation profile and increased the production of the classic M1 transcription factor NF-κB. The HMOs also enhanced macrophage phagocytosis and uptake of S. aureus. Importantly, the different HMOs did not notably affect macrophage activation and differentiation without S. aureus exposure. Together, these findings show that HMOs can potently augment the immune response against S. aureus, without causing inflammatory activation in the absence of S. aureus, suggesting that HMOs assist the immune system in targeting important pathogens during early infancy.
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Affiliation(s)
- Stine Dam Jepsen
- dsm-firmenich, Hørsholm, Denmark
- Immunology, Section for Preclinical Disease Biology, Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Astrid Lund
- Immunology, Section for Preclinical Disease Biology, Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark
| | | | - Lars Andresen
- Immunology, Section for Preclinical Disease Biology, Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark
| | | | - Søren Skov
- Immunology, Section for Preclinical Disease Biology, Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark
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11
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Yagi Y, Doke A, Iwame S, Arakawa Y, Yamagishi Y. Epidemiological Study on Case Definition of Methicillin-Resistant Staphylococcus aureus Enteritis. Infect Drug Resist 2024; 17:2237-2247. [PMID: 38854779 PMCID: PMC11162192 DOI: 10.2147/idr.s459708] [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: 01/15/2024] [Accepted: 05/17/2024] [Indexed: 06/11/2024] Open
Abstract
Background Methicillin-resistant Staphylococcus aureus (MRSA) enteritis is a condition in which MRSA grows abnormally in the intestine after administration of antimicrobial agents, resulting in enteritis. Patients with MRSA detected in stool culture tests are often diagnosed with MSRA enteritis. However, uncertainty remains in the diagnostic criteria; therefore, we conducted epidemiological studies to define these cases. Patients and Methods Patients who tested positive for MRSA by stool culture using selective media 48 h after admission to Kochi Medical School Hospital between April 1, 2012, and December 31, 2022, and did not meet the exclusion criteria were included. We defined MRSA enteritis (Group A) as cases that were responsive to treatment with vancomycin hydrochloride powder, had a Bristol Stool Scale of ≥ 5, and a stool frequency of at least three times per day; all others were MRSA carriers (Group B). Multivariate analysis was performed to risk factors associated with MRSA enteritis. Results Groups A and B included 18 (25.4%) and 53 (74.6%) patients, respectively. Multivariate logistic regression analysis showed that a white blood cell count of > 10000/µL (odds ratio [OR], 5.50; 95% confidence interval [CI], 1.12-26.9), MRSA count of ≥ 2+ in stool cultures (OR, 8.91; 95% CI, 1.79-44.3), and meropenem administration within 1 month of stool specimen submission (OR, 7.47; 95% CI, 1.66-33.6) were risk factors of MRSA enteritis. Conclusion The case definitions reviewed for MRSA enteritis may be useful as diagnostic criteria.
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Affiliation(s)
- Yusuke Yagi
- Department of Infection Prevention and Control, Kochi Medical School Hospital, Nankoku, Kochi, Japan
- Department of Pharmacy, Kochi Medical School Hospital, Nankoku, Kochi, Japan
| | - Akito Doke
- Department of Infection Prevention and Control, Kochi Medical School Hospital, Nankoku, Kochi, Japan
- Department of Clinical Laboratory, Kochi Medical School Hospital, Nankoku, Kochi, Japan
| | - Saya Iwame
- Department of Infection Prevention and Control, Kochi Medical School Hospital, Nankoku, Kochi, Japan
- Department of Clinical Laboratory, Kochi Medical School Hospital, Nankoku, Kochi, Japan
| | - Yu Arakawa
- Department of Infection Prevention and Control, Kochi Medical School Hospital, Nankoku, Kochi, Japan
- Department of Clinical Infectious Diseases, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Yuka Yamagishi
- Department of Infection Prevention and Control, Kochi Medical School Hospital, Nankoku, Kochi, Japan
- Department of Clinical Infectious Diseases, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
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12
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Kong L, Zhang R, Gong J, Wang H, Zhai L, Dang D, Liu Q, Zhao Z, Tang BZ. Aggregation-induced emission photosensitizer for antibacterial therapy of methicillin-resistant Staphylococcus aureus. Chem Commun (Camb) 2024; 60:5960-5963. [PMID: 38767007 DOI: 10.1039/d4cc01022a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
A cationic aggregation-induced emission photosensitizer (AIE-PS) MNNPyBB has been reported to have antibacterial effects against both Gram-positive and Gram-negative bacteria. The bacterial kill mechanism has been investigated and elucidated. In a methicillin-resistant Staphylococcus aureus subcutaneous infection model, wound closure has been achieved with normal re-epithelialization and preserved skin morphology.
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Affiliation(s)
- Lin Kong
- College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
- School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong (CUHKSZ), Shenzhen, Guangdong 518172, China.
| | - Rongyuan Zhang
- School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong (CUHKSZ), Shenzhen, Guangdong 518172, China.
| | - Junyi Gong
- School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong (CUHKSZ), Shenzhen, Guangdong 518172, China.
| | - Huan Wang
- College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Lingyu Zhai
- College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P. R. China
| | - Dongfeng Dang
- School of Science, MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Qian Liu
- Department of Urology, Tianjin First Central Hospital, Tianjin 300192, China
| | - Zheng Zhao
- School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong (CUHKSZ), Shenzhen, Guangdong 518172, China.
| | - Ben Zhong Tang
- School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong (CUHKSZ), Shenzhen, Guangdong 518172, China.
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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13
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Li D, Ge Y, Wang N, Shi Y, Guo G, Zhang J, Zou Q, Liu Q. A novel member of drug/metabolite transporter (DMT) family efflux pump, SA00565, contributes to tetracycline antibiotics resistance in Staphylococcus aureus USA300. Microbiol Spectr 2024; 12:e0011124. [PMID: 38651886 DOI: 10.1128/spectrum.00111-24] [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: 01/12/2024] [Accepted: 03/28/2024] [Indexed: 04/25/2024] Open
Abstract
Drug efflux systems have recently been recognized as a significant mechanism responsible for multidrug resistance in bacteria. In this study, we described the identification and characterization of a new chromosomally encoded efflux pump (SA00565) in Staphylococcus aureus. SA00565, which belongs to the drug/metabolite transporter (DMT) superfamily, was predicted to be a 10-transmembrane segment transporter. To evaluate the role of sa00565 in resistance, we generated sa00565 gene deletion mutant (Δsa00565) and assessed its susceptibility to 35 different antibiotic treatments. Our results demonstrated that the Δsa00565 mutant exhibited reduced resistance to tetracycline and doxycycline, with 64-fold and 12-fold decreased MICs, respectively. The mechanism of SA00565-mediated tetracycline resistance was demonstrated that SA00565 possesses the capability to efficiently extrud intracellular tetracycline into the environment. The efflux activity of SA00565 was further validated using EtBr accumulation and efflux assays. In summary, our study uncovered a previously unknown function of a DMT family transporter, which serves as a tetracycline efflux pump, thereby contributing to tetracycline resistance in S. aureus.IMPORTANCEIn this study, we addressed the significance of drug efflux systems in multidrug resistance of Staphylococcus aureus, focusing on the unexplored efflux pump SA00565 in the drug/metabolite transporter (DMT) superfamily. Through phylogenetic analysis, gene knockout, and overexpression experiments, we identified the role of SA00565 in antibiotic resistance. The Δsa00565 mutant showed increased susceptibility to tetracycline and doxycycline in disk diffusion assays, with significantly lower MICs compared to the WT. Remarkably, intracellular tetracycline concentration in the mutant was two- to threefold higher, indicating SA00565 actively eliminates intracellular tetracycline. Our findings emphasize the pivotal contribution of SA00565 to tetracycline antibiotic resistance in S. aureus, shedding light on its functional attributes within the DMT superfamily and providing valuable insights for combating multidrug resistance.
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Affiliation(s)
- Daiyu Li
- West China Biopharmaceutical Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Yan Ge
- West China Biopharmaceutical Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Ning Wang
- West China Biopharmaceutical Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Yun Shi
- West China Biopharmaceutical Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Gang Guo
- West China Biopharmaceutical Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Jing Zhang
- West China Biopharmaceutical Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Quanming Zou
- Department of Microbiology and Biochemical Pharmacy, National Engineering Research Center of Immunological Products, College of Pharmacy, Third Military Medical University, Chongqing, China
| | - Qiang Liu
- West China Biopharmaceutical Research Institute, West China Hospital, Sichuan University, Chengdu, China
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14
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Su LY, Yao M, Xu W, Zhong M, Cao Y, Zhou H. Cascade encapsulation of antimicrobial peptides, exosomes and antibiotics in fibrin-gel for first-aid hemostasis and infected wound healing. Int J Biol Macromol 2024; 269:132140. [PMID: 38719006 DOI: 10.1016/j.ijbiomac.2024.132140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 04/19/2024] [Accepted: 05/05/2024] [Indexed: 05/13/2024]
Abstract
Wounding is one of the most common healthcare problems. Bioactive hydrogels have attracted much attention in first-aid hemostasis and wound healing due to their excellent biocompatibility, antibacterial properties, and pro-healing bioactivity. However, their applications are limited by inadequate mechanical properties. In this study, we first prepared edible rose-derived exosome-like nanoparticles (ELNs) and used them to encapsulate antimicrobial peptides (AMP), abbreviated as ELNs(AMP). ELNs(AMP) showed superior intracellular antibacterial activity, 2.5 times greater than AMP, in in vitro cell infection assays. We then prepared and tested an FDA-approved fibrin-gel of fibrinogen and thrombin encapsulating ELNs(AMP) and novobiocin sodium salt (NB) (ELNs(AMP)/NB-fibrin-gels). The fibrin gel showed a sustained release of ELNs(AMP) and NB over the eight days of testing. After spraying onto the skin, the formulation underwent in situ gelation and developed a stable patch with excellent hemostatic performance in a mouse liver injury model with hemostasis in 31 s, only 35.6 % of the PBS group. The fibrin gel exhibited pro-wound healing properties in the mouse-infected skin defect model. The thickness of granulation tissue and collagen of the ELNs(AMP)/NB-fibrin-gels group was 4.00, 6.32 times greater than that of the PBS group. In addition, the ELNs(AMP)/NB-fibrin-gels reduced inflammation (decreased mRNA levels of TNF-α, IL-1β, IL6, MCP1, and CXCL1) at the wound sites and demonstrated a biocompatible and biosafe profile. Thus, we have developed a hydrogel system with excellent hemostatic, antibacterial, and pro-wound healing properties, which may be a candidate for next-generation tissue regeneration with a wide clinical application for first-aid hemostasis and infected wound healing.
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Affiliation(s)
- Ling-Yan Su
- College of Food Science and Technology, Yunnan Agricultural University, No. 452 Fengyuan Road, Kunming 650000, China; Yunnan Provincial Key Laboratory of Precision Nutrition and Personalized Food Manufacturing, Yunnan Agricultural University, Kunming 650000, China
| | - Mengyu Yao
- Department of Cardiovascular Surgery, The First People's Hospital of Yunnan Province, Xishan District, No.157 Jinbi Road, Kunming 650032, China; School of Medical, Kunming University of Science and Technology, No.727 Jingming South Road, Kunming 650000, China
| | - Wen Xu
- College of Food Science and Technology, Yunnan Agricultural University, No. 452 Fengyuan Road, Kunming 650000, China
| | - Minghua Zhong
- Department of Cardiovascular Surgery, The First People's Hospital of Yunnan Province, Xishan District, No.157 Jinbi Road, Kunming 650032, China; Yunnan Key Laboratory of Innovative Application of Traditional Chinese Medicine, The First People's Hospital of Yunnan Province, Kunming 650000, China
| | - Yu Cao
- Department of Cardiovascular Surgery, The First People's Hospital of Yunnan Province, Xishan District, No.157 Jinbi Road, Kunming 650032, China; Yunnan Key Laboratory of Innovative Application of Traditional Chinese Medicine, The First People's Hospital of Yunnan Province, Kunming 650000, China.
| | - Hejiang Zhou
- College of Food Science and Technology, Yunnan Agricultural University, No. 452 Fengyuan Road, Kunming 650000, China; Yunnan Provincial Key Laboratory of Precision Nutrition and Personalized Food Manufacturing, Yunnan Agricultural University, Kunming 650000, China.
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15
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Okabe K, Chikasue K, Murakami K, Matsuda N, Yamada S. Suppressed distribution of protein A on the surface of Staphylococcus aureus as a morphological characteristic of erythromycin-resistant strain. Med Mol Morphol 2024; 57:101-109. [PMID: 38386083 DOI: 10.1007/s00795-023-00379-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 12/24/2023] [Indexed: 02/23/2024]
Abstract
To identify a new morphological phenotype of erythromycin (EM)-resistant Staphylococcus aureus (S. aureus) were isolated in vitro from EM-sensitive parent strain, and the distribution of staphylococcus specific protein A (SpA) on the surface of these strains was examined morphologically by using applied immunoelectron microscopy. The isolated EM-resistant strains had thickened cell walls, and the distribution of SpA on the surfaces of these strains was demonstrated to be lower than that of the parent strain. The SpA suppression was confirmed by enzyme-linked immunosorbent assay (ELISA) using fixed EM-resistant cells. Moreover, the spa gene of EM-resistant cells was detected by polymerase chain reaction (PCR) and confirmed by quantitative real-time PCR assay, showing that the expression of SpA was repressed at the transcriptional level in these strains. Furthermore, ELISA assay showed that whole EM-resistant cell SpA content was significantly decreased. Therefore, it was considered that the suppression of surface SpA on the EM-resistant strain was due to regulated SpA production, and not dependent on the conformational change in SpA molecule expression through cell wall thickening. These results strongly suggest that suppressed SpA distribution on the EM-resistant S. aureus is a phenotypical characteristic in these strains.
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Affiliation(s)
- Kanako Okabe
- Department of Medical Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki, Okayama, 701-0193, Japan.
| | - Kumiko Chikasue
- Department of Medical Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - Keiji Murakami
- Department of Clinical Nutrition, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki, Okayama, 701-0193, Japan
| | - Nobuaki Matsuda
- Electron Microscope Center, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama, Japan
| | - Sakuo Yamada
- Department of Medical Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki, Okayama, 701-0193, Japan
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16
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Qi J, Zhang X, Guo X, Yang Y, Fan X, Han Y, Liu Y. Evaluation of the in vitro and in vivo antimicrobial activity of alkaloids prepared from Chelidonium majus L. using MRSA- infected C. elegans as a model host. Fitoterapia 2024; 175:105944. [PMID: 38580033 DOI: 10.1016/j.fitote.2024.105944] [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: 01/12/2024] [Revised: 03/19/2024] [Accepted: 04/01/2024] [Indexed: 04/07/2024]
Abstract
Chelidonium majus L. contained alkaloids as its main component, exhibiting various biological activities, particularly antibacterial activity. This study aimed to extract alkaloids from C. majus L. (total alkaloids) and evaluate their antibacterial activity both in vitro and in vivo. Reflux extraction was carried out on C. majus L., and the extract was purified with HPD-600 macroporous resin and 732 cation exchange resin columns. Infection modeling of Caenorhabditis elegans (C. elegans) was established to investigate the impact of Methicillin-resistant Staphylococcus aureus (MRSA) and Methicillin-sensitive Staphylococcus aureus (MSSA) on the motility, longevity, and reactive oxygen species (ROS) levels of wild-type worms (N2 strain). The effects of total alkaloids on longevity and ROS were further evaluated in infected N2 worms. Additionally, the effect of total alkaloids on the stress resistance of C. elegans and the mechanism of action were investigated. By utilizing CB1370, DR26 and CF1038 transgenic strains of C. elegans to identify whether the antibacterial activity of total alkaloids was dependent on DAF-2/DAF-16 pathway. The results showed that total alkaloids exhibited a significant antibacterial activity against both MRSA and MSSA (MIC 31.25 μg/mL). Compared with MSSA, the MRSA exhibited a stronger inhibitory effect on the movement behavior and development of worms, along with faster pathogenicity and unique virulence factors. Total alkaloids also displayed the ability to extend the lifespan of C. elegans under oxidative stress and heat stress, and reduce the expression of ROS. The antibacterial activity of total alkaloids was primarily dependent on the DAF-2/DAF-16 pathway, and the presence of functional DAF-2 was deemed essential in total alkaloids mediated immune response against MRSA. Moreover, the antibacterial and anti-infection effects of total alkaloids were found to be associated with the daf-16 gene fragment.
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Affiliation(s)
- Jinchai Qi
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Xinyun Zhang
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Xiaochen Guo
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Yuping Yang
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Xiaoxiao Fan
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China
| | - Yunfeng Han
- Peking University Third Hospital, Beijing 102488, China.
| | - Yonggang Liu
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 102488, China.
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17
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Abdulkadir A, Kabir J, Bello M, Olayinka B. Unknown spa types, spa repeats, and relatedness of MRSA isolated from horses, dogs, cats, and their human handlers. Res Vet Sci 2024; 172:105248. [PMID: 38554547 DOI: 10.1016/j.rvsc.2024.105248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 02/10/2024] [Accepted: 03/24/2024] [Indexed: 04/01/2024]
Abstract
Methicillin resistant Staphylococcus aureus (MRSA) represents a worrying example of antimicrobial resistance, and it is essential to acquire new information to monitor the spread and limit it further diffusion. This study aimed to characterise 22 MRSA isolates from horses, dogs, cats, and their human handlers focusing on spa typing. In the analysis of the sequences obtained, the spa type is "unknown" (unidentified) and all the sequences except one had repeats previously not known in all databases potentially indicating new spa-repeats. This could possibly indicate either permanent import of novel spa types or in-house microevolution of spa repeats.
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Affiliation(s)
- Aliyu Abdulkadir
- Department of Veterinary Public Health & Preventive Medicine, Ahmadu Bello University, Zaria 810106, Nigeria.
| | - Junaidu Kabir
- Department of Veterinary Public Health & Preventive Medicine, Ahmadu Bello University, Zaria 810106, Nigeria
| | - Mohammed Bello
- Department of Veterinary Public Health & Preventive Medicine, Ahmadu Bello University, Zaria 810106, Nigeria
| | - Busayo Olayinka
- Department of Pharmaceutics & Pharmaceutical Microbiology, Ahmadu Bello University, Zaria 810106, Nigeria
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18
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Cao R, Su H, Wei Z, He Z, Pan T, Li Y, Sun B. An induced mutation of ABC-transporter component VraF(K84E) contributes to vancomycin resistance and virulence in Staphylococcus aureus strain MW2. Int J Med Microbiol 2024; 315:151624. [PMID: 38838390 DOI: 10.1016/j.ijmm.2024.151624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Revised: 05/22/2024] [Accepted: 05/23/2024] [Indexed: 06/07/2024] Open
Abstract
Staphylococcus aureus is a notorious pathogen responsible for various severe diseases. Due to the emergence of drug-resistant strains, the prevention and treatment of S. aureus infections have become increasingly challenging. Vancomycin is considered to be one of the last-resort drugs for treating most methicillin-resistant S. aureus (MRSA), so it is of great significance to further reveal the mechanism of vancomycin resistance. VraFG is one of the few important ABC (ATP-binding cassette) transporters in S. aureus that can form TCS (two-component systems)/ABC transporter modules. ABC transporters can couple the energy released from ATP hydrolysis to translocate solutes across the cell membrane. In this study, we obtained a strain with decreased vancomycin susceptibility after serial passaging and selection. Subsequently, whole-genome sequencing was performed on this laboratory-derived strain MWA2 and a novel single point mutation was discovered in vraF gene, leading to decreased sensitivity to vancomycin and daptomycin. Furthermore, the mutation reduces autolysis of S. aureus and downregulates the expression of lytM, isaA, and atlA. Additionally, we observed that the mutant has a less net negative surface charge than wild-type strain. We also noted an increase in the expression of the dlt operon and mprF gene, which are associated with cell surface charge and serve to hinder the binding of cationic peptides by promoting electrostatic repulsion. Moreover, this mutation has been shown to enhance hemolytic activity, expand subcutaneous abscesses, reflecting an increased virulence. This study confirms the impact of a point mutation of VraF on S. aureus antibiotic resistance and virulence, contributing to a broader understanding of ABC transporter function and providing new targets for treating S. aureus infections.
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Affiliation(s)
- Ruobing Cao
- Institute of Advanced Technology, University of Science and Technology of China, Hefei, China
| | - Huimin Su
- Department of Oncology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Zichun Wei
- Institute of Advanced Technology, University of Science and Technology of China, Hefei, China
| | - Zhien He
- Department of Oncology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Ting Pan
- Department of Oncology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Yujie Li
- Department of Oncology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China.
| | - Baolin Sun
- Institute of Advanced Technology, University of Science and Technology of China, Hefei, China; Department of Oncology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China.
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Hu W, Wang Y, Zhou L, Chu K, Jin P, Liang Q, Li J, Tan Z, Zhu F. Nasal Staphylococcus aureus Carriage and Antimicrobial Resistance Profiles Among Community-Dwelling Adults in Jiangsu, China. Infect Dis Ther 2024; 13:1215-1233. [PMID: 38700654 PMCID: PMC11128426 DOI: 10.1007/s40121-024-00969-4] [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: 03/05/2024] [Accepted: 03/27/2024] [Indexed: 05/28/2024] Open
Abstract
INTRODUCTION Persistent nasal carriage has been associated with Staphylococcus aureus infection. Previous S. aureus studies in Asia have primarily focused on clinical patients, providing limited information on persistent nasal carriage among the general adult population. METHODS This study examined 143 healthy adults in a community in Jiangsu, China. Nasal swab samples were collected 10 times. The colonization status was identified using SPA typing. We also determined antimicrobial susceptibility, genotype, and genomic characteristics of S. aureus. RESULTS The prevalence of S. aureus nasal carriage among the community individuals was on average 16.78%. The carriage rates of methicillin-resistant S. aureus and multidrug-resistant S. aureus were 6.29% and 7.69%, respectively. We identified 8.39% persistent carriers, 39.16% intermittent carriers, and 52.45% noncarriers. Furthermore, family members displayed concordance in terms of genotype and genomic characteristics. CONCLUSION Persistent nasal sampling captured intermittent carriers that were missed during short-term sampling, thus highlighting the necessity for regular community testing. SPA typing can serve as a rapid method for determining S. aureus colonization. The potential for intrafamilial transmission of S. aureus is evident, with persistent carriers being the most probable source of infection.
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Affiliation(s)
- Wenjing Hu
- School of Public Health, Southeast University, Nanjing, Jiangsu, China
| | - Yang Wang
- Department of Science and Education, Tongde Hospital of Zhejiang Province, Hangzhou, Zhejiang, China
| | - Lu Zhou
- NHC Key Laboratory of Enteric Pathogenic Microbiology, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu, China
| | - Kai Chu
- National Health Commission Key Laboratory of Enteric Pathogenic Microbiology, Jiangsu Provincial Medical Innovation Center, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu, China
| | - Pengfei Jin
- National Health Commission Key Laboratory of Enteric Pathogenic Microbiology, Jiangsu Provincial Medical Innovation Center, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu, China
| | - Qi Liang
- National Health Commission Key Laboratory of Enteric Pathogenic Microbiology, Jiangsu Provincial Medical Innovation Center, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu, China
| | - Jingxin Li
- National Health Commission Key Laboratory of Enteric Pathogenic Microbiology, Jiangsu Provincial Medical Innovation Center, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu, China
| | - Zhongming Tan
- NHC Key Laboratory of Enteric Pathogenic Microbiology, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu, China.
| | - Fengcai Zhu
- School of Public Health, Southeast University, Nanjing, Jiangsu, China.
- National Health Commission Key Laboratory of Enteric Pathogenic Microbiology, Jiangsu Provincial Medical Innovation Center, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu, China.
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20
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Alexyuk M, Bogoyavlenskiy A, Moldakhanov Y, Akanova K, Manakbayeva A, Alexyuk P. Draft genome sequence data of methicillin-resistant Staphylococcus aureus, strain 4233. Data Brief 2024; 54:110492. [PMID: 38799713 PMCID: PMC11127097 DOI: 10.1016/j.dib.2024.110492] [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: 04/04/2024] [Revised: 04/24/2024] [Accepted: 04/29/2024] [Indexed: 05/29/2024] Open
Abstract
Staphylococcus aureus is a conditionally pathogenic microorganism and one of the main causative agents of antibiotic resistant nosocomial infections. In immunocompromised people, S. aureus infection can cause folliculitis, furuncles, impetigo, osteomyelitis, septic arthritis, sepsis, endocarditis, pneumonia and meningitis. In the presented work, sequencing of a methicillin-resistant S. aureus, strain 4233, was performed on the Illumina MiSeq platform, followed by bioinformatics processing and gene annotation using SPAdes, RAST and CARD programs and databases. The submitted genome is a total of 2,790,390 bp long and contains 2759 genes, including 82 RNA genes. 33 % of the genes are functionally significant and represent 25 functional groups. Fourteen genes encoding resistance factors to 14 different types of antibacterial drugs were predicted. The information provided on the genome of S. aureus, strain 4233 will be of value in investigating the evolution and formation of antibiotic-resistant forms of S. aureus.
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Affiliation(s)
- Madina Alexyuk
- Research and Production Center for Microbiology and Virology, Bogenbay batyr. Str., 105, Almaty 050010, Kazakhstan
| | - Andrey Bogoyavlenskiy
- Research and Production Center for Microbiology and Virology, Bogenbay batyr. Str., 105, Almaty 050010, Kazakhstan
| | - Yergali Moldakhanov
- Research and Production Center for Microbiology and Virology, Bogenbay batyr. Str., 105, Almaty 050010, Kazakhstan
| | - Kuralay Akanova
- Research and Production Center for Microbiology and Virology, Bogenbay batyr. Str., 105, Almaty 050010, Kazakhstan
| | - Adolat Manakbayeva
- Research and Production Center for Microbiology and Virology, Bogenbay batyr. Str., 105, Almaty 050010, Kazakhstan
| | - Pavel Alexyuk
- Research and Production Center for Microbiology and Virology, Bogenbay batyr. Str., 105, Almaty 050010, Kazakhstan
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21
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Garbo V, Condemi A, Albano C, Polara VF, Parrino R, Macaluso A, Venuti L, Colomba C. Dalbavancin for the treatment of acute bacterial skin and skin structure infections (ABSSSI) in pediatric patients: a case series. LE INFEZIONI IN MEDICINA 2024; 32:231-240. [PMID: 38827834 PMCID: PMC11142406 DOI: 10.53854/liim-3202-11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Accepted: 05/07/2024] [Indexed: 06/05/2024]
Abstract
Acute bacterial skin and skin-structure infections (ABSSSI) are a significant cause of morbidity in pediatric patients, requiring timely and effective treatment. Dalbavancin, a long-acting lipoglycopeptide antibiotic recently approved for pediatric use, offers advantages such as excellent bactericidal activity against Gram-positive bacteria (including multidrug-resistant pathogens) and high tissue penetration. We present a case series of pediatric patients with ABSSSI treated with dalbavancin. Five cases were described demonstrating the efficacy of dalbavancin in different clinical scenarios. Patients with complex skin conditions, including cellulitis and deep abscesses, benefited from dalbavancin therapy, achieving significant clinical improvement. Notably, dalbavancin facilitated early discharge, improving quality of life and reducing healthcare costs. These cases highlight the potential of dalbavancin as a valuable treatment option for ABSSSI in pediatric patients, particularly in settings where conventional therapies fail to achieve optimal clinical outcomes or prolonged hospitalization is not feasible. Further research is needed to clarify its role and optimize its use in pediatric patients with ABSSSI.
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Affiliation(s)
- Valeria Garbo
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties “G. D’Alessandro”, University of Palermo, Palermo,
Italy
- Division of Paediatric Infectious Disease, “G. Di Cristina” Hospital, ARNAS Civico Di Cristina Benfratelli, Palermo,
Italy
| | - Anna Condemi
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties “G. D’Alessandro”, University of Palermo, Palermo,
Italy
- Division of Paediatric Infectious Disease, “G. Di Cristina” Hospital, ARNAS Civico Di Cristina Benfratelli, Palermo,
Italy
| | - Chiara Albano
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties “G. D’Alessandro”, University of Palermo, Palermo,
Italy
| | - Valentina Frasca Polara
- Division of Paediatric Infectious Disease, “G. Di Cristina” Hospital, ARNAS Civico Di Cristina Benfratelli, Palermo,
Italy
| | - Roberta Parrino
- Division of Paediatric Infectious Disease, “G. Di Cristina” Hospital, ARNAS Civico Di Cristina Benfratelli, Palermo,
Italy
| | - Alessandra Macaluso
- Division of Paediatric Infectious Disease, “G. Di Cristina” Hospital, ARNAS Civico Di Cristina Benfratelli, Palermo,
Italy
| | - Laura Venuti
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties “G. D’Alessandro”, University of Palermo, Palermo,
Italy
| | - Claudia Colomba
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties “G. D’Alessandro”, University of Palermo, Palermo,
Italy
- Division of Paediatric Infectious Disease, “G. Di Cristina” Hospital, ARNAS Civico Di Cristina Benfratelli, Palermo,
Italy
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22
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Keikha M, Karbalaei M. Global distribution of heterogeneous vancomycin-intermediate Staphylococcus aureus strains (1997-2021): a systematic review and meta-analysis. J Glob Antimicrob Resist 2024; 37:11-21. [PMID: 38336227 DOI: 10.1016/j.jgar.2024.02.002] [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: 04/06/2023] [Revised: 02/01/2024] [Accepted: 02/02/2024] [Indexed: 02/12/2024] Open
Abstract
BACKGROUND Heterogeneous vancomycin-intermediate Staphylococcus aureus is considered one of the main causes in treatment failure of vancomycin, which leads to poor clinical outcomes. Herein, we comprehensively evaluated characteristics such as global prevalence, trend, and genetic backgrounds of these strains. METHODS In this study, we conducted a meta-analysis based on PRISMA checklist 2020. In the beginning, global databases were searched to achieve the studies related to the prevalence of hVISA in clinical isolates of methicillin-resistant Staphylococcus aureus. After retrieving the eligible English studies, the prevalence of hVISA isolates and their trend changes were assessed using event rate with 95% confidence intervals. RESULTS In the present study, the prevalence of 114 801 MRSA isolates (of 124 studies) was 64%. According to our results, although the frequency of infection with hVISA is increasing in recent years, there is not a significant difference between Asian countries and Europe/America (6.1% vs. 6.8%). In addition, infection with hVISA bacteria was higher in bacteraemic patients than other infections (9.4% vs. 5.5%), which increases hospitalization, treatment costs, and mortality in these patients. Isolates harbouring SCCmec types II and III are most common genotypes in hVISA strains. CONCLUSIONS The prevalence of hVISA is increasing, which will reduce the effectiveness of vancomycin treatment in the coming years. The presence of hVISA stains in blood samples was higher than the other samples, which is threatening for bacteraemic patients. The results of the current study indicate a universal program to identify and control the spread of such strains in nosocomial infections.
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Affiliation(s)
- Masoud Keikha
- Department of Microbiology and Virology, School of Medicine, Iranshahr University of Medical Sciences, Iranshahr, Iran
| | - Mohsen Karbalaei
- Department of Microbiology and Virology, School of Medicine, Jiroft University of Medical Sciences, Jiroft, Iran; Bio Environmental Health Hazards Research Center, Jiroft University of Medical Sciences, Jiroft, Iran.
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23
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Rodrigues FAF, Teixeira RR, Bazzolli DMS, da Silva GC, Fontes PP, Diaz-Muñoz G, Rossi CC, Diaz MAN. Two novel synthetic xanthenodiones as antimicrobial, anti-adhesive and antibiofilm compounds against methicillin resistant Staphylococcus aureus. Braz J Microbiol 2024; 55:1243-1249. [PMID: 38551766 PMCID: PMC11153428 DOI: 10.1007/s42770-024-01305-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 03/05/2024] [Indexed: 06/07/2024] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is widely recognized as a causative agent for various infections acquired in healthcare settings as well as in the community. Given the limited availability of effective antimicrobial agents to combat MRSA infections, there is an increasing need to explore alternative therapeutic strategies. This study aimed to assess the antimicrobial, anti-adhesive, anti-biofilm properties, and toxicity of 175 newly synthesized compounds, belonging to seven different classes, against MRSA. Initially, the compounds underwent screening for antimicrobial activity using the agar diffusion method. Subsequently, active compounds underwent further evaluation to determine their minimum inhibitory concentrations through microdilution. Anti-biofilm and anti-adhesive properties were assessed using the crystal violet method, while toxicity was tested using the alternative infection model Galleria mellonella. Among the tested compounds, two xanthenodiones exhibited the most promising activities, displaying bactericidal effects along with anti-adhesive and anti-biofilm properties. Moreover, the observed non-toxicity in G. mellonella larvae suggests that these compounds hold significant potential as alternative therapeutic options to address the escalating challenge of MRSA resistance in both hospital and community settings.
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Affiliation(s)
| | | | - Denise Mara Soares Bazzolli
- Instituto de Biotecnologia Aplicado à Agropecuária - BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Giarlã Cunha da Silva
- Instituto de Biotecnologia Aplicado à Agropecuária - BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Patrícia Pereira Fontes
- Instituto de Biotecnologia Aplicado à Agropecuária - BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Gaspar Diaz-Muñoz
- Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Ciro César Rossi
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
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24
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Ramos B, Cunha MV. The mobilome of Staphylococcus aureus from wild ungulates reveals epidemiological links at the animal-human interface. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 356:124241. [PMID: 38825220 DOI: 10.1016/j.envpol.2024.124241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 04/28/2024] [Accepted: 05/26/2024] [Indexed: 06/04/2024]
Abstract
Staphylococcus aureus thrives at animal-human-environment interfaces. A large-scale work from our group indicated that antimicrobial resistance (AMR) in commensal S. aureus strains from wild ungulates is associated with agricultural land cover and livestock farming, raising the hypothesis that AMR genes in wildlife strains may originate from different hosts, namely via exchange of mobile genetic elements (MGE). In this work, we generate the largest available dataset of S. aureus draft genomes from wild ungulates in Portugal and explore their mobilome, which can determine important traits such as AMR, virulence, and host specificity, to understand MGE exchange. Core genome multi-locus sequence typing based on 98 newly generated draft genomes and 101 publicly available genomes from Portugal demonstrated that the genomic relatedness of S. aureus from wild ungulates assigned to livestock-associated sequence types (ST) is greater compared to wild ungulate isolates assigned to human-associated STs. Screening of host specificity determinants disclosed the unexpected presence in wildlife of the immune evasion cluster encoded in φSa3 prophage, described as a human-specific virulence determinant. Additionally, two plasmids, pAVX and pETB, previously associated with avian species and humans, respectively, and the Tn553 transposon were detected. Both pETB and Tn553 encode penicillin resistance through blaZ. Pangenome analysis of wild ungulate isolates shows a core genome fraction of 2133 genes, with isolates assigned to ST72 and ST3224 being distinguished from the remaining by MGEs, although there is no reported role of these in adaptation to wildlife. AMR related gene clusters found in the shell genome are directly linked to resistance against penicillin, macrolides, fosfomycin, and aminoglycosides, and they represent mobile ARGs. Altogether, our findings support epidemiological interactions of human and non-human hosts at interfaces, with MGE exchange, including AMR determinants, associated with putative indirect movements of S. aureus among human and wildlife hosts that might be bridged by livestock.
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Affiliation(s)
- Beatriz Ramos
- Centre for Ecology, Evolution and Environmental Changes (cE3c) & CHANGE - Global Change and Sustainability Institute, Faculdade de Ciências da Universidade de Lisboa, 1749-016, Lisboa, Portugal; Biosystems and Integrative Sciences Institute (BioISI), Faculdade de Ciências da Universidade de Lisboa, 1749-016, Lisboa, Portugal
| | - Mónica V Cunha
- Centre for Ecology, Evolution and Environmental Changes (cE3c) & CHANGE - Global Change and Sustainability Institute, Faculdade de Ciências da Universidade de Lisboa, 1749-016, Lisboa, Portugal; Biosystems and Integrative Sciences Institute (BioISI), Faculdade de Ciências da Universidade de Lisboa, 1749-016, Lisboa, Portugal.
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25
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Chen Z, Wan X, Lou C, Bai Y, Chai T, Wu B. Research Note: The structure and diversity of antibiotic resistance genes in animal house environment. Poult Sci 2024; 103:103896. [PMID: 38889568 DOI: 10.1016/j.psj.2024.103896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 05/11/2024] [Accepted: 05/20/2024] [Indexed: 06/20/2024] Open
Abstract
In recent years, a series of public health issues caused by the spread of antibiotic resistance have been widely concerned. The indoor air of livestock and poultry houses is considered to be one of the main sources of environmental contamination of ARGs. This study characterized the micro-organisms and ARGs in the air particulate matter of chicken houses using metagenomics. The study successfully detected 761 different subtypes of resistance genes including aminoglycosides, tetracyclines, MLSB etc., 4 types of mobile genetic elements, and various pathogenic microorganisms from the aerosols in the chicken coop environment. The results showed that the abundance of ARGs in the air of the chicken coop was at a relatively high level, correlation network analysis showed that multiple types of ARGs could promote the emergence of antibiotic-resistant bacteria.
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Affiliation(s)
- Zhuo Chen
- Guangdong Provincial Key Laboratory of Animal Molecular Design and Precise Breeding, School of Life Science and Engineering, Foshan University, Foshan 528000, China
| | - Xiaojie Wan
- Guangdong Provincial Key Laboratory of Animal Molecular Design and Precise Breeding, School of Life Science and Engineering, Foshan University, Foshan 528000, China
| | - Cheng Lou
- Guangdong Provincial Key Laboratory of Animal Molecular Design and Precise Breeding, School of Life Science and Engineering, Foshan University, Foshan 528000, China
| | - Yu Bai
- Guangdong Provincial Key Laboratory of Animal Molecular Design and Precise Breeding, School of Life Science and Engineering, Foshan University, Foshan 528000, China
| | - Tongjie Chai
- College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271000, China
| | - Bo Wu
- Guangdong Provincial Key Laboratory of Animal Molecular Design and Precise Breeding, School of Life Science and Engineering, Foshan University, Foshan 528000, China.
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26
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Ju G, Zhang Y, Ye C, Liu Q, Sun H, Zhang Z, Huang X, Jiang Y, Huang Q. Comparative effectiveness and safety of six antibiotics in treating MRSA infections: A network meta-analysis. Int J Infect Dis 2024:107109. [PMID: 38789000 DOI: 10.1016/j.ijid.2024.107109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 05/20/2024] [Accepted: 05/20/2024] [Indexed: 05/26/2024] Open
Abstract
OBJECTIVES This study conducted a network meta-analysis comparing linezolid, teicoplanin, daptomycin, tigecycline, and ceftaroline fosamil with vancomycin for treating MRSA-related diseases, addressing the lack of comprehensive evaluations in existing research on antibiotic therapy for MRSA infections. METHODS We systematically searched databases including PubMed, Embase, Web of Science, the Cochrane Librar up to August 22, 2023. All eligible randomized controlled trials of the six antibiotics were included in the NMA, and their effectiveness and safety were compared across various MRSA-related diseases. Categorical data were used for the odds ratio (OR), and continuous data were used for mean difference (SMD). The surface under the cumulative ranking (SUCRA) was employed to evaluate the incidence rate. RESULTS According to SUCRA results, daptomycin was the most effective treatment (73.0%) in bloodstream infections. In pulmonary infections and skin and soft tissue infections, linezolid out-performed other antibiotics in effectiveness rate (90.6% and 86.3%), microbial killing rate (93.3% and 93.1%). Vancomycin showed lower adverse reactions than teicoplanin, with less hepatotoxicity compared to linezolid and tigecycline. Linezolid had higher thrombocytopenia risk but lower nephrotoxicity risk than others. Vancomycin was less effective in microbial killing rates than linezolid across various infections. CONCLUSIONS The present research suggests that in pulmonary infections and skin and soft tissue infections, linezolid may be a better option for treating MRSA-related diseases. However, caution is warranted due to the association of linezolid with thrombocytopenia. TRIAL REGISTRATION Our study protocol was registered with the International Prospective Register of SystematicReviews (PROSPERO); Registration number: CRD42024535142.
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Affiliation(s)
- Gehang Ju
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, China; Hunan Key Laboratory for Bioanalysis of Complex Matrix Samples, Changsha Duxact Biotech Co., Ltd., Changsha, China.
| | - Yan Zhang
- Department of Clinical Pharmacy, the First People's Hospital of Neijiang, Neijiang, China.
| | - Chao Ye
- Department of Pharmacy, The Third Hospital of Changsha, Changsha, China.
| | - Qiong Liu
- Department of Pharmacy, Xiangya Hospital Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, 87 Xiangya Road, Changsha, China.
| | - Hanzhu Sun
- Clinical pharmacy, Dali University, Dali, China.
| | - Zhaorui Zhang
- School of Clinical Medicine, Weifang Medical University, Weifang, China.
| | - Xinyi Huang
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, China; Hunan Key Laboratory for Bioanalysis of Complex Matrix Samples, Changsha Duxact Biotech Co., Ltd., Changsha, China.
| | - Yueping Jiang
- Department of Pharmacy, Xiangya Hospital Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, 87 Xiangya Road, Changsha, China.
| | - Qi Huang
- Department of Pharmacy, Xiangya Hospital Central South University, Changsha, China; National Clinical Research Center for Geriatric Disorders, 87 Xiangya Road, Changsha, China.
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27
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Huang YC, Chen CJ, Kuo AJ, Hwang KR, Chien CC, Lee CY, Wu TH, Ko WC, Hseuh PR. Dissemination of meticillin-resistant Staphylococcus aureus sequence type 8 (USA300) in Taiwan. J Hosp Infect 2024; 149:108-118. [PMID: 38782057 DOI: 10.1016/j.jhin.2024.04.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Revised: 04/23/2024] [Accepted: 04/26/2024] [Indexed: 05/25/2024]
Abstract
BACKGROUND In Taiwan, sequence type (ST) 239 and ST59 were two major clones among meticillin-resistant Staphylococcus aureus (MRSA) clinical isolates in the past two decades. USA300 (ST8) prevailed in the Americas but not in outside areas. Recently USA300 (ST8) emerged and was increasingly identified in Taiwan; we thus conducted an island-wide study to explore the role of USA300 among MRSA isolates. METHODS One hundred MRSA bloodstream isolates identified in 2020 from each of the six participating hospitals in Taiwan were collected and characterized. The first 10 ST8 isolates from each hospital were further analysed by whole-genome sequencing. RESULTS Of the 590 confirmed MRSA isolates, a total of 22 pulsotypes and 21 STs were identified. The strain of pulsotype AI/ST8 was the most common lineage identified, accounting for 187 isolates (31.7%) and dominating in five of six hospitals, followed by pulsotype A/ST239 (14.7%), pulsotype C/ST59 (13.9%) and pulsotype D/ST59 (9.2%). Of the 187 pulsotype AI/ST8 isolates, 184 isolates were characterized as USA300 and clustered in three major sub-pulsotypes, accounting for 78%. Ninety per cent of the 60 ST8 isolates for whole-genome sequencing were clustered in three major clades. CONCLUSIONS In 2020, USA300 became the most common clone of MRSA in Taiwan, accounting for >30% of MRSA bloodstream isolates island wide. Most of USA300 isolates circulating in Taiwan might have been imported on multiple occasions and evolved into at least three successful local clades. MRSA USA300 has successfully established its role in Taiwan, an area outside of the Americas.
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Affiliation(s)
- Y-C Huang
- Department of Pediatrics, Chang Gung Memorial Hospital at Linkou, Taoyuan City, Taiwan; College of Medicine, Chang Gung University, Taoyuan City, Taiwan.
| | - C-J Chen
- Department of Pediatrics, Chang Gung Memorial Hospital at Linkou, Taoyuan City, Taiwan; College of Medicine, Chang Gung University, Taoyuan City, Taiwan
| | - A-J Kuo
- College of Medicine, Chang Gung University, Taoyuan City, Taiwan; Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, Taoyuan City, Taiwan
| | - K-R Hwang
- Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, Taoyuan City, Taiwan; Department of Laboratory Medicine, Chang Gung Memorial Hospital at Keelung, Keelung City, Taiwan
| | - C-C Chien
- Department of Laboratory Medicine, Chang Gung Memorial Hospital at Kaohsiung, Kaohsiung City, Taiwan
| | - C-Y Lee
- Department of Pediatrics, Chang Bing Show Chwan Memorial Hospital, Changhua County, Taiwan
| | - T-H Wu
- Department of Pediatrics, Chang Hua Show Chwan Memorial Hospital, Changhua, Taiwan
| | - W-C Ko
- Department of Medicine, National Cheng Kung University Hospital, Tainan City, Taiwan
| | - P-R Hseuh
- Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan; Departments of Laboratory Medicine and Internal Medicine, China Medical University Hospital, Taichung, Taiwan; School of Medicine, China Medical University, Taichung, Taiwan
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28
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Vadakkan K, Sathishkumar K, Kuttiyachan Urumbil S, Ponnenkunnathu Govindankutty S, Kumar Ngangbam A, Devi Nongmaithem B. A review of chemical signaling mechanisms underlying quorum sensing and its inhibition in Staphylococcus aureus. Bioorg Chem 2024; 148:107465. [PMID: 38761705 DOI: 10.1016/j.bioorg.2024.107465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2024] [Revised: 04/29/2024] [Accepted: 05/14/2024] [Indexed: 05/20/2024]
Abstract
Staphylococcus aureus is a significant bacterium responsible for multiple infections and is a primary cause of fatalities among patients in hospital environments. The advent of pathogenic bacteria such as methicillin-resistant S. aureus revealed the shortcomings of employing antibiotics to treat bacterial infectious diseases. Quorum sensing enhances S. aureus's survivability through signaling processes. Targeting the key components of quorum sensing has drawn much interest nowadays as a promising strategy for combating infections caused by bacteria. Concentrating on the accessory gene regulator quorum-sensing mechanism is the most commonly suggested anti-virulence approach for S.aureus. Quorum quenching is a common strategy for controlling illnesses triggered by microorganisms since it reduces the pathogenicity of bacteria and improves bacterial biofilm susceptibility to antibiotics, thus providing an intriguing prospect for drug discovery. Quorum sensing inhibition reduces selective stresses and constrains the emergence of antibiotic resistance while limiting bacterial pathogenicity. This review examines the quorum sensing mechanisms involved in S. aureus, quorum sensing targets and gene regulation, environmental factors affecting quorum sensing, quorum sensing inhibition, natural products as quorum sensing inhibitory agents and novel therapeutical strategies to target quorum sensing in S. aureus as drug developing technique to augment conventional antibiotic approaches.
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Affiliation(s)
- Kayeen Vadakkan
- Department of Biotechnology, St. Mary's College (Autonomous), Thrissur, Kerala 680020, India; Manipur International University, Imphal, Manipur 795140, India.
| | - Kuppusamy Sathishkumar
- Center for Global Health Research, Saveetha Medical College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Thandalam, Chennai, Tamil Nadu 602105, India
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Zhou JL, Chen HH, Xu J, Huang MY, Wang JF, Shen HJ, Shen SX, Gao CX, Qian CD. Myricetin Acts as an Inhibitor of Type II NADH Dehydrogenase from Staphylococcus aureus. Molecules 2024; 29:2354. [PMID: 38792214 PMCID: PMC11124336 DOI: 10.3390/molecules29102354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Revised: 05/09/2024] [Accepted: 05/10/2024] [Indexed: 05/26/2024] Open
Abstract
BACKGROUND Staphylococcus aureus is a common pathogenic microorganism in humans and animals. Type II NADH oxidoreductase (NDH-2) is the only NADH:quinone oxidoreductase present in this organism and represents a promising target for the development of anti-staphylococcal drugs. Recently, myricetin, a natural flavonoid from vegetables and fruits, was found to be a potential inhibitor of NDH-2 of S. aureus. The objective of this study was to evaluate the inhibitory properties of myricetin against NDH-2 and its impact on the growth and expression of virulence factors in S. aureus. RESULTS A screening method was established to identify effective inhibitors of NDH-2, based on heterologously expressed S. aureus NDH-2. Myricetin was found to be an effective inhibitor of NDH-2 with a half maximal inhibitory concentration (IC50) of 2 μM. In silico predictions and enzyme inhibition kinetics further characterized myricetin as a competitive inhibitor of NDH-2 with respect to the substrate menadione (MK). The minimum inhibitory concentrations (MICs) of myricetin against S. aureus strains ranged from 64 to 128 μg/mL. Time-kill assays showed that myricetin was a bactericidal agent against S. aureus. In line with being a competitive inhibitor of the NDH-2 substrate MK, the anti-staphylococcal activity of myricetin was antagonized by MK-4. In addition, myricetin was found to inhibit the gene expression of enterotoxin SeA and reduce the hemolytic activity induced by S. aureus culture on rabbit erythrocytes in a dose-dependent manner. CONCLUSIONS Myricetin was newly discovered to be a competitive inhibitor of S. aureus NDH-2 in relation to the substrate MK. This discovery offers a fresh perspective on the anti-staphylococcal activity of myricetin.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Chao-Dong Qian
- College of Life Sciences, Zhejiang Chinese Medical University, Hangzhou 310053, China; (J.-L.Z.); (H.-H.C.); (J.X.); (M.-Y.H.); (J.-F.W.); (H.-J.S.); (S.-X.S.); (C.-X.G.)
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Chen Y, Xu Z, Wang X, Sun X, Xu X, Li X, Cheng G. Highly Efficient Photodynamic Hydrogel with AIE-Active Photosensitizers toward Methicillin-Resistant Staphylococcus aureus Ultrafast Imaging and Killing. ACS Biomater Sci Eng 2024; 10:3401-3411. [PMID: 38624061 DOI: 10.1021/acsbiomaterials.4c00056] [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] [Indexed: 04/17/2024]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) causes great health hazards to society because most antibiotics are ineffective. Photodynamic treatment (PDT) has been proposed to combat MRSA due to the advantage of imaging-guided no-drug resistance therapy. However, the traditional photosensitizers for PDT are limited by aggregation-caused quenching for imaging and low photodynamic antibacterial efficiency. In this work, we synthesize a new aggregation-induced emission (AIE) photosensitizer (APNO), which can ultrafast distinguish between Gram-positive and Gram-negative bacteria within 3 s by AIE-active photosensitizer imaging. Meanwhile, APNO can generate antibacterial reactive oxygen species under light irradiation, which holds potential for antibacterial PDT. Then, APNO is loaded by PHEAA hydrogel to obtain a highly efficient photodynamic hydrogel (APNO@gel). In vitro results show complete inhibition of MRSA by APNO@gel under lower-power light irradiation. Transcriptome analysis is performed to investigate antibacterial mechanism of APNO@gel. Most importantly, APNO@gel also exhibits significant inhibition and killing ability of MRSA in the MRSA wound infection model, which will further promote rapid wound healing. Therefore, the photodynamic hydrogel provides a promising strategy toward MRSA ultrafast imaging and killing.
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Affiliation(s)
- Ying Chen
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, P. R. China
| | - Ziqiang Xu
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, P. R. China
| | - Xin Wang
- Department of Molecular Diagnostics, Roche Diagnostics(Shanghai) Limited Company, Shanghai 200131, P. R. China
| | - Xuexue Sun
- Key Laboratory for Medical Tissue Regeneration of Henan Province, Xinxiang Medical University, Xinxiang 453003, P. R. China
| | - Xinhui Xu
- Key Laboratory for Medical Tissue Regeneration of Henan Province, Xinxiang Medical University, Xinxiang 453003, P. R. China
| | - Xiao Li
- School of Medical Technology, Xuzhou Medical University, Xuzhou 221004, P. R. China
| | - Guohui Cheng
- School of Pharmacy, Xuzhou Medical University, Xuzhou 221004, P. R. China
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Souza SSR, Smith JT, Marcovici MM, Eckhardt EM, Hansel NB, Martin IW, Andam CP. Demographic fluctuations in bloodstream Staphylococcus aureus lineages configure the mobile gene pool and antimicrobial resistance. NPJ ANTIMICROBIALS AND RESISTANCE 2024; 2:14. [PMID: 38725655 PMCID: PMC11076216 DOI: 10.1038/s44259-024-00032-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 03/08/2024] [Indexed: 05/12/2024]
Abstract
Staphylococcus aureus in the bloodstream causes high morbidity and mortality, exacerbated by the spread of multidrug-resistant and methicillin-resistant S. aureus (MRSA). We aimed to characterize the circulating lineages of S. aureus from bloodstream infections and the contribution of individual lineages to resistance over time. Here, we generated 852 high-quality short-read draft genome sequences of S. aureus isolates from patient blood cultures in a single hospital from 2010 to 2022. A total of 80 previously recognized sequence types (ST) and five major clonal complexes are present in the population. Two frequently detected lineages, ST5 and ST8 exhibited fluctuating demographic structures throughout their histories. The rise and fall in their population growth coincided with the acquisition of antimicrobial resistance, mobile genetic elements, and superantigen genes, thus shaping the accessory genome structure across the entire population. These results reflect undetected selective events and changing ecology of multidrug-resistant S. aureus in the bloodstream.
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Affiliation(s)
- Stephanie S. R. Souza
- Department of Biological Sciences, University at Albany, State University of New York, Albany, New York, NY USA
| | - Joshua T. Smith
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH USA
- Infectious Disease and Microbiome Program, Broad Institute of MIT and Harvard, Cambridge, MA USA
| | - Michael M. Marcovici
- Department of Biological Sciences, University at Albany, State University of New York, Albany, New York, NY USA
| | - Elissa M. Eckhardt
- Dartmouth-Hitchcock Medical Center and Dartmouth College Geisel School of Medicine, Lebanon, NH USA
| | - Nicole B. Hansel
- Dartmouth-Hitchcock Medical Center and Dartmouth College Geisel School of Medicine, Lebanon, NH USA
| | - Isabella W. Martin
- Dartmouth-Hitchcock Medical Center and Dartmouth College Geisel School of Medicine, Lebanon, NH USA
| | - Cheryl P. Andam
- Department of Biological Sciences, University at Albany, State University of New York, Albany, New York, NY USA
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32
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da Silva Pontes AL, Monteiro Leal C, Pereira Lucas M, Caamaño Muiño da Silva G, Braga Alves Peixoto JV, Barbosa Succar J, Ribeiro Flores V, Neves Direito IC, Ribeiro da Silva AJ, de Oliveira Chaves F, Eccard Fingolo C. Dereplication Tools for Rhizophora mangle Extracts from Different Mangrove Areas and their Potential Against Staphylococcus aureus. Chem Biodivers 2024:e202400687. [PMID: 38702295 DOI: 10.1002/cbdv.202400687] [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: 03/15/2024] [Revised: 04/27/2024] [Accepted: 05/03/2024] [Indexed: 05/06/2024]
Abstract
Rhizophora extracts have several potential biological activities, and their metabolites can be used in the pharmaceutical industry. Extracts of Rhizophora species obtained from mangroves have shown prospective activity against Staphylococcus aureus. This study aimed to investigate the chemical profile of Rhizophora mangle leaves from fringe, basin, and transition mangrove zones and their bactericidal/bacteriostatic potential against S. aureus. R. mangle leaves were collected monthly in 2018 from litterfall in three different zones of the mangrove of Guaratiba State Reserve: fringe, basin, and transition. Extracts were prepared from the material collected in October and December for LC-HRMS/MS analysis, and dereplication was performed using a molecular library search and the classical molecular networking GNPS platform. The minimum inhibitory concentrations (MICs) of the aqueous extract of R. mangle against S. aureus were determined. No S. aureus growth was observed compared to the control for extracts collected from September to December. Different compounds were annotated in each region, yet a marked presence of phenolic compounds was noted, among them glycosylated flavonoid derivatives of quercetin and kaempferol. The results suggest bactericidal/bacteriostatic activity for extracts of R. mangle leaves collected in 2018 from three mangrove forest zones.
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Grants
- E-26/211.995/2021 Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ, RJ, Brazil)
- E-26/200.020/2019 Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ, RJ, Brazil)
- E-26/010.002404/2019 Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ, RJ, Brazil)
- E-26/010.002381/2019 Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ, RJ, Brazil)
- E-26/200.006/2019 Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ, RJ, Brazil)
- 141535/2019-9 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Affiliation(s)
- Amanda Letícia da Silva Pontes
- Laboratório de Tecnologia em Produtos Naturais, Departamento de Farmácia, Faculdade de Ciências Biológicas e Saúde, Universidade do Estado do Rio de Janeiro (UERJ), Campus Zona Oeste, Campo Grande, Av. Manuel Caldeira de Alvarenga 1.203, Rio de Janeiro, RJ, 23070-200, Brazil
- Instituto de Pesquisas de Produtos Naturais Walter Mors, Universidade Federal do Rio de Janeiro (UFRJ), Av. Carlos Chagas Filho, s/n, CCS, Bloco H, Cidade Universitária, Rio de Janeiro, RJ, 21941-590, Brazil
| | - Carla Monteiro Leal
- Laboratório de Produtos Naturais e Ensaios Biológicos, Departamento de Produtos Naturais e Alimentos, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, 21941-902, Brazil
| | - Manuela Pereira Lucas
- Laboratório de Tecnologia em Produtos Naturais, Departamento de Farmácia, Faculdade de Ciências Biológicas e Saúde, Universidade do Estado do Rio de Janeiro (UERJ), Campus Zona Oeste, Campo Grande, Av. Manuel Caldeira de Alvarenga 1.203, Rio de Janeiro, RJ, 23070-200, Brazil
| | - Gabriela Caamaño Muiño da Silva
- Laboratório de Tecnologia em Produtos Naturais, Departamento de Farmácia, Faculdade de Ciências Biológicas e Saúde, Universidade do Estado do Rio de Janeiro (UERJ), Campus Zona Oeste, Campo Grande, Av. Manuel Caldeira de Alvarenga 1.203, Rio de Janeiro, RJ, 23070-200, Brazil
| | - João Vitor Braga Alves Peixoto
- Laboratório de Tecnologia em Produtos Naturais, Departamento de Farmácia, Faculdade de Ciências Biológicas e Saúde, Universidade do Estado do Rio de Janeiro (UERJ), Campus Zona Oeste, Campo Grande, Av. Manuel Caldeira de Alvarenga 1.203, Rio de Janeiro, RJ, 23070-200, Brazil
| | - Juliana Barbosa Succar
- Laboratório de Pesquisa em Biotecnologia Ambiental, Faculdade de Ciências Biológicas e Saúde, Universidade do Estado do Rio de Janeiro (UERJ), Campus Zona Oeste, Campo Grande, Av. Manuel Caldeira de Alvarenga 1.203, Rio de Janeiro, RJ, 23070-200, Brazil
| | - Vinicius Ribeiro Flores
- Laboratório de Pesquisa em Biotecnologia Ambiental, Faculdade de Ciências Biológicas e Saúde, Universidade do Estado do Rio de Janeiro (UERJ), Campus Zona Oeste, Campo Grande, Av. Manuel Caldeira de Alvarenga 1.203, Rio de Janeiro, RJ, 23070-200, Brazil
| | - Ida Carolina Neves Direito
- Laboratório de Pesquisa em Biotecnologia Ambiental, Faculdade de Ciências Biológicas e Saúde, Universidade do Estado do Rio de Janeiro (UERJ), Campus Zona Oeste, Campo Grande, Av. Manuel Caldeira de Alvarenga 1.203, Rio de Janeiro, RJ, 23070-200, Brazil
| | - Antonio Jorge Ribeiro da Silva
- Instituto de Pesquisas de Produtos Naturais Walter Mors, Universidade Federal do Rio de Janeiro (UFRJ), Av. Carlos Chagas Filho, s/n, CCS, Bloco H, Cidade Universitária, Rio de Janeiro, RJ, 21941-590, Brazil
| | - Filipe de Oliveira Chaves
- Núcleo de Estudos em Manguezais, Universidade do Estado do Rio de Janeiro (UERJ), Rua São Francisco Xavier, 524, Maracanã, Rio de Janeiro, RJ, 20550-900, Brazil
| | - Catharina Eccard Fingolo
- Laboratório de Tecnologia em Produtos Naturais, Departamento de Farmácia, Faculdade de Ciências Biológicas e Saúde, Universidade do Estado do Rio de Janeiro (UERJ), Campus Zona Oeste, Campo Grande, Av. Manuel Caldeira de Alvarenga 1.203, Rio de Janeiro, RJ, 23070-200, Brazil
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Nagarajan A, Scoggin K, Gupta J, Aminian M, Adams LG, Kirby M, Threadgill D, Andrews-Polymenis H. Collaborative Cross mice have diverse phenotypic responses to infection with Methicillin-resistant Staphylococcus aureus USA300. PLoS Genet 2024; 20:e1011229. [PMID: 38696518 PMCID: PMC11108197 DOI: 10.1371/journal.pgen.1011229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 05/21/2024] [Accepted: 03/18/2024] [Indexed: 05/04/2024] Open
Abstract
Staphylococcus aureus (S. aureus) is an opportunistic pathogen causing diseases ranging from mild skin infections to life threatening conditions, including endocarditis, pneumonia, and sepsis. To identify host genes modulating this host-pathogen interaction, we infected 25 Collaborative Cross (CC) mouse strains with methicillin-resistant S. aureus (MRSA) and monitored disease progression for seven days using a surgically implanted telemetry system. CC strains varied widely in their response to intravenous MRSA infection. We identified eight 'susceptible' CC strains with high bacterial load, tissue damage, and reduced survival. Among the surviving strains, six with minimal colonization were classified as 'resistant', while the remaining six tolerated higher organ colonization ('tolerant'). The kidney was the most heavily colonized organ, but liver, spleen and lung colonization were better correlated with reduced survival. Resistant strains had higher pre-infection circulating neutrophils and lower post-infection tissue damage compared to susceptible and tolerant strains. We identified four CC strains with sexual dimorphism: all females survived the study period while all males met our euthanasia criteria earlier. In these CC strains, males had more baseline circulating monocytes and red blood cells. We identified several CC strains that may be useful as new models for endocarditis, myocarditis, pneumonia, and resistance to MRSA infection. Quantitative Trait Locus (QTL) analysis identified two significant loci, on Chromosomes 18 and 3, involved in early susceptibility and late survival after infection. We prioritized Npc1 and Ifi44l genes as the strongest candidates influencing survival using variant analysis and mRNA expression data from kidneys within these intervals.
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Affiliation(s)
- Aravindh Nagarajan
- Interdisciplinary Program in Genetics and Genomics, Texas A&M University, College Station, Texas, United States of America
- Department of Microbial Pathogenesis and Immunology, Texas A&M University, College Station, Texas, United States of America
| | - Kristin Scoggin
- Interdisciplinary Program in Genetics and Genomics, Texas A&M University, College Station, Texas, United States of America
- Department of Molecular and Cellular Medicine, Texas A&M University, College Station, Texas, United States of America
| | - Jyotsana Gupta
- Department of Microbial Pathogenesis and Immunology, Texas A&M University, College Station, Texas, United States of America
| | - Manuchehr Aminian
- Department of Mathematics, Colorado State University, Fort Collins, Colorado, United States of America
- Department of Mathematics and Statistics, California State Polytechnic University, Pomona, California, United States of America
| | - L. Garry Adams
- Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas, United States of America
| | - Michael Kirby
- Department of Mathematics, Colorado State University, Fort Collins, Colorado, United States of America
| | - David Threadgill
- Interdisciplinary Program in Genetics and Genomics, Texas A&M University, College Station, Texas, United States of America
- Department of Molecular and Cellular Medicine, Texas A&M University, College Station, Texas, United States of America
- Texas A&M Institute for Genome Sciences and Society, Texas A&M University, College Station, Texas, United States of America
- Department of Biochemistry & Biophysics and Department of Nutrition, Texas A&M University, College Station, Texas, United States of America
| | - Helene Andrews-Polymenis
- Interdisciplinary Program in Genetics and Genomics, Texas A&M University, College Station, Texas, United States of America
- Department of Microbial Pathogenesis and Immunology, Texas A&M University, College Station, Texas, United States of America
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Ghoreyshizadeh E, Manouchehrifar M, Ramazanzadeh R, Peeri Doghaheh H, Amani M, Arzanlou M. Occurrence and Characteristics of Toxigenic Staphylococcus aureus in Retail Foods in Iran. Foodborne Pathog Dis 2024; 21:331-338. [PMID: 38346315 DOI: 10.1089/fpd.2023.0122] [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] [Indexed: 05/12/2024] Open
Abstract
Staphylococcus aureus causes various toxigenic and invasive diseases in humans worldwide. This study examined the prevalence, virulence genes, and antibiotic resistance of S. aureus isolates collected from 894 retail food samples in Ardabil, Iran. Staphylococcal cassette chromosome mec (SCCmec), spa, and multilocus sequence typing methods were employed to further investigate the molecular characteristics of methicillin-resistant S. aureus (MRSA) isolates. The results revealed that 11.18% (n = 100) of food samples exhibited contamination with S. aureus (10.50% methicillin-sensitive S. aureus [MSSA] and 0.67% MRSA). Notably, raw minced meat (29.41%), Faloodeh (25%), and Olivier salad (21.42%) emerged as the most frequently contaminated food items. Among the 100 isolates of S. aureus, 94% were characterized as MSSA, with the remaining 6% identified as MRSA. The highest resistance was observed for penicillin (12%). MRSA isolates exhibited significantly higher resistance rates. Seventy-nine percent of the isolates were positive for sea, 14% for seb, 8% for a sec, and 0% for sed enterotoxin-encoding genes. Sixteen percent of isolates harbored two or more staphylococcal enterotoxin genes, simultaneously. Moreover, 97%, 94%, 24%, and 22% of isolates were positive for hla, hld, tst, and pvl virulence-encoding genes, respectively. No isolate was positive for the exfoliative toxins encoding eta and etb genes. MRSA isolates belonged to CC8 (n = 4) and CC22 (n = 2). Isolates in CC8 belonged to lineage ST239-MRSA-III and spa type t030; the isolates in CC22 belonged to ST22-MRSA-IV and spa types t310 and t223. In conclusion, a relatively high proportion of our retail food samples were contaminated with S. aureus. The high incidence of isolates with toxigenic genes raises serious health concerns. Furthermore, the presence of MRSA lineages linked to humans suggests that retail foods may be contaminated with human origin.
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Affiliation(s)
- Erfan Ghoreyshizadeh
- Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
- Zoonoses Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Meysam Manouchehrifar
- Food Control Laboratory, Deputy of Food and Drug, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Rashid Ramazanzadeh
- Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Hadi Peeri Doghaheh
- Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Mojtaba Amani
- Department of Medicinal Chemistry, Faculty of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Mohsen Arzanlou
- Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
- Zoonoses Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
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35
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Cheney L, Payne M, Kaur S, Lan R. SaLTy: a novel Staphylococcus aureus Lineage Typer. Microb Genom 2024; 10:001250. [PMID: 38739116 PMCID: PMC11165655 DOI: 10.1099/mgen.0.001250] [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: 02/18/2024] [Accepted: 04/19/2024] [Indexed: 05/14/2024] Open
Abstract
Staphylococcus aureus asymptomatically colonises 30 % of humans but can also cause a range of diseases, which can be fatal. In 2017 S. aureus was associated with 20 000 deaths in the USA alone. Dividing S. aureus isolates into smaller sub-groups can reveal the emergence of distinct sub-populations with varying potential to cause infections. Despite multiple molecular typing methods categorising such sub-groups, they do not take full advantage of S. aureus genome sequences when describing the fundamental population structure of the species. In this study, we developed Staphylococcus aureus Lineage Typing (SaLTy), which rapidly divides the species into 61 phylogenetically congruent lineages. Alleles of three core genes were identified that uniquely define the 61 lineages and were used for SaLTy typing. SaLTy was validated on 5000 genomes and 99.12 % (4956/5000) of isolates were assigned the correct lineage. We compared SaLTy lineages to previously calculated clonal complexes (CCs) from BIGSdb (n=21 173). SALTy improves on CCs by grouping isolates congruently with phylogenetic structure. SaLTy lineages were further used to describe the carriage of Staphylococcal chromosomal cassette containing mecA (SCCmec) which is carried by methicillin-resistant S. aureus (MRSA). Most lineages had isolates lacking SCCmec and the four largest lineages varied in SCCmec over time. Classifying isolates into SaLTy lineages, which were further SCCmec typed, allowed SaLTy to describe high-level MRSA epidemiology. We provide SaLTy as a simple typing method that defines phylogenetic lineages (https://github.com/LanLab/SaLTy). SaLTy is highly accurate and can quickly analyse large amounts of S. aureus genome data. SaLTy will aid the characterisation of S. aureus populations and ongoing surveillance of sub-groups that threaten human health.
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Affiliation(s)
- Liam Cheney
- School of Biotechnology and Biomolecular Science, University of New South Wales, Sydney, Australia
| | - Michael Payne
- School of Biotechnology and Biomolecular Science, University of New South Wales, Sydney, Australia
| | - Sandeep Kaur
- School of Biotechnology and Biomolecular Science, University of New South Wales, Sydney, Australia
| | - Ruiting Lan
- School of Biotechnology and Biomolecular Science, University of New South Wales, Sydney, Australia
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Guo X, Zhang X, Yu M, Cheng Z, Feng Y, Chen B. Iron decoration in binary graphene oxide and copper iron sulfide nanocomposites boosting catalytic antibacterial activity in acidic microenvironment against antimicrobial resistance. J Colloid Interface Sci 2024; 661:802-814. [PMID: 38330653 DOI: 10.1016/j.jcis.2024.02.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 01/21/2024] [Accepted: 02/02/2024] [Indexed: 02/10/2024]
Abstract
The strong antimicrobial resistance (AMR) of multidrug-resistant (MDR) bacteria and biofilm, especially the biofilm with extracellular polymeric substance (EPS) protection and persister cells, not only renders antibiotics ineffective but also causes chronic infections and makes the infectious tissue difficult to repair. Considering the acidic properties of bacterial infection microenvironment and biofilm, herein, a binary graphene oxide and copper iron sulfide nanocomposite (GO/CuFeSx NC) is synthesized by a surfactant free strategy and utilized as an alternative smart nanozyme to fight against the MDR bacteria and biofilm. For the GO/CuFeSx NC, the iron decoration facilitates the well distribution of bimetallic CuFeSx NPs on the GO surfaces compared to monometallic CuS NPs, providing synergistically enhanced peroxidase (POD)-like activity in acidic medium (pH 4 ∼ 5) and intrinsic strong near infrared (NIR) light responsive photothermal activity, while the ultrathin and sharp structure of 2D GO nanosheet allows the GO/CuFeSx NC to strongly interact with the bacteria and biofilm, facilitating the catalytic and photothermal attacks on the bacterial surfaces. In addition, the GO in GO/CuFeSx NC exhibits a "Pseudo-Photo-Fenton" effect to promote the ROS generation. Therefore, the GO/CuFeSx NC can effectively kill bacteria and biofilm both in vitro and in vivo, finally eliminating the infections and accelerating the tissue repair when treating the biofilm-infected wound. This work paves a new way to the design of novel nanozyme for smart antibacterial therapy against antimicrobial resistance.
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Affiliation(s)
- Xiaobin Guo
- Department of Orthopaedics, First Affiliated Hospital of Xinjiang Medical University, 137 South LiYuShan Road, Urumqi, Xinjiang 830054, China
| | - Xiaogang Zhang
- Department of Orthopaedics, First Affiliated Hospital of Xinjiang Medical University, 137 South LiYuShan Road, Urumqi, Xinjiang 830054, China
| | - Min Yu
- Institute for Advanced Materials, School of Materials Science and Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China
| | - Zerui Cheng
- Institute for Advanced Materials, School of Materials Science and Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China
| | - Yonghai Feng
- Institute for Advanced Materials, School of Materials Science and Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China.
| | - Binghai Chen
- Department of Urology, Affiliated Hospital of Jiangsu University, 438 Jiefang Road, Zhenjiang 212001, China; Institute of Translational Medicine of Jiangsu University, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China.
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37
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Rossi CC, Ahmad F, Giambiagi-deMarval M. Staphylococcus haemolyticus: An updated review on nosocomial infections, antimicrobial resistance, virulence, genetic traits, and strategies for combating this emerging opportunistic pathogen. Microbiol Res 2024; 282:127652. [PMID: 38432015 DOI: 10.1016/j.micres.2024.127652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/30/2024] [Accepted: 02/17/2024] [Indexed: 03/05/2024]
Abstract
Staphylococcus haemolyticus, a key species of the Staphylococcus genus, holds significant importance in healthcare-associated infections, due to its notable resistance to antimicrobials, like methicillin, and proficient biofilms-forming capabilities. This coagulase-negative bacterium poses a substantial challenge in the battle against nosocomial infections. Recent research has shed light on Staph. haemolyticus genomic plasticity, unveiling genetic elements responsible for antibiotic resistance and their widespread dissemination within the genus. This review presents an updated and comprehensive overview of the clinical significance and prevalence of Staph. haemolyticus, underscores its zoonotic potential and relevance in the one health framework, explores crucial virulence factors, and examines genetics features contributing to its success in causing emergent and challenging infections. Additionally, we scrutinize ongoing studies aimed at controlling spread and alternative approaches for combating it.
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Affiliation(s)
- Ciro César Rossi
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Viçosa, MG, Brazil.
| | - Faizan Ahmad
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Viçosa, MG, Brazil
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Dominski BH, Raitz MDF, Provenzi MA, Silveira ACDO, Sincero TCM, Ferreira FA. Characterization of Methicillin-resistant Staphylococcus aureus (MRSA) isolated in Santa Catarina (SC), Brazil. Diagn Microbiol Infect Dis 2024; 109:116244. [PMID: 38452557 DOI: 10.1016/j.diagmicrobio.2024.116244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 02/05/2024] [Accepted: 03/04/2024] [Indexed: 03/09/2024]
Abstract
The study investigated the characteristics of Methicillin-resistant Staphylococcus aureus (MRSA) isolated in Santa Catarina. Findings revealed prevalent SCCmecII and IV, multiresistance, Leucocidin ED genes, and one ST105 isolate. The results indicated that the in-state MRSA isolates showed the same characteristics as the out-of-state isolates among the investigated features.
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Affiliation(s)
- Bruno Hech Dominski
- Laboratório de Genética Molecular Bacteriana (GeMBac), Departamento de Microbiologia, Imunologia e Parasitologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina (UFSC), Campus Universitário Reitor João David Ferreira Lima, Trindade, Florianópolis, SC 88040-960, Brazil
| | - Maria de Fátima Raitz
- Laboratório de Genética Molecular Bacteriana (GeMBac), Departamento de Microbiologia, Imunologia e Parasitologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina (UFSC), Campus Universitário Reitor João David Ferreira Lima, Trindade, Florianópolis, SC 88040-960, Brazil
| | - Marcel Afonso Provenzi
- Laboratório de Genética Molecular Bacteriana (GeMBac), Departamento de Microbiologia, Imunologia e Parasitologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina (UFSC), Campus Universitário Reitor João David Ferreira Lima, Trindade, Florianópolis, SC 88040-960, Brazil
| | - Alessandro Conrado de Oliveira Silveira
- Departamento de Ciências Farmacêuticas, Fundação Universidade Regional de Blumenau (FURB). Rua Antônio da Veiga, 140. Itoupava Seca, Blumenau, SC 89030-903, Brazil
| | - Thais Cristine Marques Sincero
- Laboratório de Microbiologia Molecular Aplicada (MIMA); Departamento de Análises Clínicas, Centro de Ciências da Saúde, Universidade Federal de Santa Catarina (UFSC), Campus Universitário Reitor João David Ferreira Lima, Trindade, Florianópolis, SC 88040-960, Brazil
| | - Fabienne Antunes Ferreira
- Laboratório de Genética Molecular Bacteriana (GeMBac), Departamento de Microbiologia, Imunologia e Parasitologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina (UFSC), Campus Universitário Reitor João David Ferreira Lima, Trindade, Florianópolis, SC 88040-960, Brazil.
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Raghu MS, Pradeep Kumar CB, Yogesh Kumar K, Prashanth MK, Alharethy F, Jeon BH. Synthesis, biological evaluation and molecular docking study of pyrimidine linked thiazolidinedione derivatives as potential antimicrobial and antitubercular agents. Bioorg Med Chem Lett 2024; 103:129707. [PMID: 38492608 DOI: 10.1016/j.bmcl.2024.129707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 03/11/2024] [Accepted: 03/14/2024] [Indexed: 03/18/2024]
Abstract
The design and development of novel antimicrobial agents are highly desired to combat the emergence of medication resistance against microorganisms that cause infections. A series of new pyrimidine-linked thiazolidinedione derivatives (5a-j) were synthesized, characterized, and their antimicrobial properties assessed in the current investigation. Here, novel pyrimidine-linked thiazolidinedione compounds were designed using the molecular hybridization approach. Elemental and spectral techniques were used to determine the structures of the synthesized hybrids. The majority of compounds showed encouraging antibacterial properties. Among the active compounds, 5g, 5i, and 5j showed 1.85, 1.15, and 1.38 times the activity of streptomycin against S. aureus, respectively, with MIC values of 6.4, 10.3, and 8.6 µM. With MIC values of 10.8, 21.9, and 15.4 µM, respectively, the compounds 5g, 5i, and 5j showed 2.14, 1.05, and 1.50 times the activity of linezolid against the methicillin-resistant S. aureus (MRSA) strain. Furthermore, when compared to the reference medications, compounds 5g, 5i, and 5j demonstrated broad-range antimicrobial efficacy against all tested strains of bacteria and fungus. Out of all the compounds that were investigated, compounds 5g, 5i, and 5j showed noteworthy anti-tubercular activity. 5g is the most effective, 1.59 times more effective than reference drug isoniazid. To anticipate the binding manner, the synthesized potent compounds were subjected to molecular docking into the active binding site of MRSA and the mycobacterial membrane protein large 3 (MmpL3) protein. The compounds 5g, 5i, and 5j may eventually serve as lead compounds in the search for antimicrobial and anti-TB therapeutic agents.
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Affiliation(s)
- M S Raghu
- Department of Chemistry, New Horizon College of Engineering, Bengaluru 560 103, India
| | - C B Pradeep Kumar
- Department of Chemistry, Malnad College of Engineering, Hassan 573 202, India
| | - K Yogesh Kumar
- Department of Chemistry, Faculty of Engineering and Technology, Jain University, Ramanagara 562 112, India
| | - M K Prashanth
- Department of Chemistry, B N M Institute of Technology, Bengaluru 560 070, India.
| | - Fahd Alharethy
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Byong-Hun Jeon
- Department of Earth Resources and Environmental Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
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Horváth A, Tormássi Á, Hajósi-Kalcakosz S, Huber A, Sahin-Tóth J, Dobay O. High clonal diversity of Staphylococcus aureus isolates from children's playgrounds in Hungary. Sci Rep 2024; 14:10021. [PMID: 38693249 PMCID: PMC11063029 DOI: 10.1038/s41598-024-60481-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 04/23/2024] [Indexed: 05/03/2024] Open
Abstract
Staphylococcus aureus is one of the most important human pathogenic bacteria and environmental surfaces play an important role in the spread of the bacterium. Presence of S. aureus on children's playgrounds and on toys was described in international studies, however, little is known about the prevalence and characteristics of S. aureus at playgrounds in Europe. In this study, 355 samples were collected from playgrounds from 16 cities in Hungary. Antibiotic susceptibility of the isolates was tested for nine antibiotics. Presence of virulence factors was detected by PCR. Clonal diversity of the isolates was tested by PFGE and MLST. The overall prevalence of S. aureus was 2.81% (10/355) and no MRSA isolates were found. Presence of spa (10), fnbA (10), fnbB (5), icaA (8), cna (7), sea (2), hla (10), hlb (2) and hlg (6) virulence genes were detected. The isolates had diverse PFGE pulsotypes. With MLST, we have detected isolates belonging to ST8 (CC8), ST22 (CC22), ST944 and ST182 (CC182), ST398 (CC398), ST6609 (CC45), ST3029 and ST2816. We have identified a new sequence type, ST6609 of CC45. S. aureus isolates are present on Hungarian playgrounds, especially on plastic surfaces. The isolates were clonally diverse and showed resistance to commonly used antibiotics. These data reinforce the importance of the outdoor environment in the spread for S. aureus in the community.
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Affiliation(s)
- Andrea Horváth
- Institute of Medical Microbiology, Semmelweis University, Nagyvárad tér 4., 1089, Budapest, Hungary.
| | - Áron Tormássi
- Institute of Medical Microbiology, Semmelweis University, Nagyvárad tér 4., 1089, Budapest, Hungary
| | - Szofia Hajósi-Kalcakosz
- Department of Infectious Diseases, Heim Pál Children's Hospital, Üllői út 86., 1089, Budapest, Hungary
| | - Annamária Huber
- Institute of Medical Microbiology, Semmelweis University, Nagyvárad tér 4., 1089, Budapest, Hungary
| | - Judit Sahin-Tóth
- Institute of Medical Microbiology, Semmelweis University, Nagyvárad tér 4., 1089, Budapest, Hungary
| | - Orsolya Dobay
- Institute of Medical Microbiology, Semmelweis University, Nagyvárad tér 4., 1089, Budapest, Hungary
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Zhang W, Wang X, Zhao L, Gu Y, Chen Y, Liu N, An L, Bai L, Chen Y, Cui S. Genome-based surveillance reveals cross-transmission of MRSA ST59 between humans and retail livestock products in Hanzhong, China. Front Microbiol 2024; 15:1392134. [PMID: 38741738 PMCID: PMC11089119 DOI: 10.3389/fmicb.2024.1392134] [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: 02/27/2024] [Accepted: 04/08/2024] [Indexed: 05/16/2024] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) has been recognized in hospitals, community and livestock animals and the epidemiology of MRSA is undergoing a major evolution among humans and animals in the last decade. This study investigated the prevalence of MRSA isolates from ground pork, retail whole chicken, and patient samples in Hanzhong, China. The further characterization was performed by antimicrobial susceptibility testing and in-depth genome-based analysis to identify the resistant determinants and their phylogenetic relationship. A total of 93 MRSA isolates were recovered from patients (n = 67) and retail livestock products (n = 26) in Hanzhong, China. 83.9% (78/93) MRSA isolates showed multiple drug resistant phenotype. Three dominant livestock-associated methicillin-resistant Staphylococcus aureus (LA-MRSA) sequence types were identified: ST59-t437 (n = 47), ST9-t899 (n = 10) and ST398 (n = 7). There was a wide variation among sequence types in the distribution of tetracycline-resistance, scn-negative livestock markers and virulence genes. A previous major human MRSA ST59 became the predominant interspecies MRSA sequence type among humans and retail livestock products. A few LA-MRSA isolates from patients and livestock products showed close genetic similarity. The spreading of MRSA ST59 among livestock products deserving special attention and active surveillance should be enacted for the further epidemic spread of MRSA ST59 in China. Data generated from this study will contribute to formulation of new strategies for combating spread of MRSA.
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Affiliation(s)
- Wei Zhang
- Department of Immunology and Pathogenic Biology, College of Basic Medicine, Xi’an Jiaotong University Health Science Center, Xi’an, China
- 3201 Hospital, Hanzhong, China
- National Institutes for Food and Drug Control, Beijing, China
| | - Xueshuo Wang
- National Institutes for Food and Drug Control, Beijing, China
| | - Linna Zhao
- National Institutes for Food and Drug Control, Beijing, China
| | | | - Yiwen Chen
- National Institutes for Food and Drug Control, Beijing, China
| | - Na Liu
- National Institutes for Food and Drug Control, Beijing, China
| | - Lin An
- National Institutes for Food and Drug Control, Beijing, China
| | - Li Bai
- China National Center for Food Safety Risk Assessment, Beijing, China
| | - Yanjiong Chen
- Department of Immunology and Pathogenic Biology, College of Basic Medicine, Xi’an Jiaotong University Health Science Center, Xi’an, China
| | - Shenghui Cui
- National Institutes for Food and Drug Control, Beijing, China
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Huang YW, Yu MC, Lin CB, Lee JJ, Lin CJ, Chien ST, Lee CH, Chiang CY. Mitigating treatment failure of pulmonary pre-extensively drug-resistant tuberculosis: The role of new and repurposed drugs. JOURNAL OF MICROBIOLOGY, IMMUNOLOGY, AND INFECTION = WEI MIAN YU GAN RAN ZA ZHI 2024:S1684-1182(24)00076-8. [PMID: 38705821 DOI: 10.1016/j.jmii.2024.04.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 04/17/2024] [Accepted: 04/18/2024] [Indexed: 05/07/2024]
Abstract
BACKGROUND Pre-extensively drug-resistant tuberculosis (pre-XDR-TB), defined as multidrug-resistant TB (MDR-TB) with additional resistance to any fluoroquinolone (FQ) is difficult to treat. We assessed whether the use of new or repurposed drugs (bedaquiline, delamanid, linezolid, carbapenem, clofazimine, pretomanid) mitigated treatment failure of pre-XDR-TB. METHODS MDR-TB patients managed in the Taiwan MDR-TB consortium between July 2009-December 2019 were eligible. Treatment outcomes at 30 months were assessed. Logistic regression models were constructed to investigate factors associated with treatment outcomes. RESULTS 109 patients with FQ-resistant MDR-TB and 218 patients with FQ-susceptible MDR-TB were included. 60 (55.1%) patients with FQ-resistant MDR-TB and 63 (28.9%) patients with FQ-susceptible MDR-TB have been treated with new or repurposed drugs (p < 0.01). Of the 218 patients with FQ-susceptible MDR-TB, 187 (85.8%) had treatment success, 30 (13.8%) died, no treatment failure, and 1 (0.5%) was loss-to-follow-up; of the 109 patients with FQ-resistant MDR-TB, 78 (71.6%) had treatment success, 21 (19.3%) died, 9 (8.3%) had treatment failure, and 1 (0.9%) was loss-to-follow-up (p < 0.01). The use of new or repurposed drugs was not associated with treatment outcomes among patients with FQ-susceptible MDR-TB. No patients with FQ-resistant MDR-TB treated with ≥2 new or repurposed drugs within 6 months of treatment initiation had treatment failure (p = 0.03). Patients with FQ-resistant MDR-TB treated with 1 new or repurposed drugs was more likely to have treatment failure as compared with patients not treated with new or repurposed drugs (adjOR 7.06, 95% CI 1.72-29.06). CONCLUSIONS Proper use of new or repurposed anti-TB drugs can mitigate treatment failure in FQ-resistant MDR-TB.
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Affiliation(s)
- Yi-Wen Huang
- Chang-Hua Hospital, Ministry of Health and Welfare, Chang-Hua, Taiwan; Institute of Medicine, Chang Shan Medical University, Taichung, Taiwan
| | - Ming-Chih Yu
- Division of Pulmonary Medicine, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan; School of Respiratory Therapy, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chih-Bin Lin
- Division of Chest Medicine, Department of Internal Medicine, Tzu Chi General Hospital, Tzu Chi University, Hualien, Taiwan; School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Jen-Jyh Lee
- Division of Chest Medicine, Department of Internal Medicine, Tzu Chi General Hospital, Tzu Chi University, Hualien, Taiwan
| | - Chou-Jui Lin
- Tao-Yuan General Hospital, Ministry of Health and Welfare, Tao-Yuan, Taiwan
| | - Shun-Tien Chien
- Chest Hospital, Ministry of Health and Welfare, Tainan, Taiwan
| | - Chih-Hsin Lee
- Division of Pulmonary Medicine, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan; Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chen-Yuan Chiang
- Division of Pulmonary Medicine, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan; Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan; International Union Against Tuberculosis and Lung Disease, Paris, France.
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Guo H, Lei T, Yang J, Wang Y, Wang Y, Ji Y. New Insights into the Biological Functions of Essential TsaB/YeaZ Protein in Staphylococcus aureus. Antibiotics (Basel) 2024; 13:393. [PMID: 38786122 PMCID: PMC11117223 DOI: 10.3390/antibiotics13050393] [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: 04/10/2024] [Revised: 04/22/2024] [Accepted: 04/24/2024] [Indexed: 05/25/2024] Open
Abstract
TsaB/YeaZ represents a promising target for novel antibacterial agents due to its indispensable role in bacterial survival, high conservation within bacterial species, and absence of eukaryotic homologs. Previous studies have elucidated the role of the essential staphylococcal protein, TsaB/YeaZ, in binding DNA to mediate the transcription of the ilv-leu operon, responsible for encoding key enzymes involved in the biosynthesis of branched-chain amino acids-namely isoleucine, leucine, and valine (ILV). However, the regulation of ILV biosynthesis does not account for the essentiality of TsaB/YeaZ for bacterial growth. In this study, we investigated the impact of TsaB/YeaZ depletion on bacterial morphology and gene expression profiles using electron microscopy and deep transcriptomic analysis, respectively. Our results revealed significant alterations in bacterial size and surface smoothness upon TsaB/YeaZ depletion. Furthermore, we pinpointed specific genes and enriched biological pathways significantly affected by TsaB/YeaZ during the early and middle exponential phases and early stationary phases of growth. Crucially, our research uncovered a regulatory role for TsaB/YeaZ in bacterial autolysis. These discoveries offer fresh insights into the multifaceted biological functions of TsaB/YeaZ within S. aureus.
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Affiliation(s)
- Haiyong Guo
- School of Life Science, Jilin Normal University, Siping 136000, China; (H.G.)
| | - Ting Lei
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN 55108, USA; (T.L.)
| | - Junshu Yang
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN 55108, USA; (T.L.)
| | - Yue Wang
- School of Life Science, Jilin Normal University, Siping 136000, China; (H.G.)
| | - Yifan Wang
- School of Life Science, Jilin Normal University, Siping 136000, China; (H.G.)
| | - Yinduo Ji
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, Saint Paul, MN 55108, USA; (T.L.)
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Wang C, Wu Y, Xue Y, Zou L, Huang Y, Zhang P, Ji J. Combinatorial discovery of antibacterials via a feature-fusion based machine learning workflow. Chem Sci 2024; 15:6044-6052. [PMID: 38665528 PMCID: PMC11041243 DOI: 10.1039/d3sc06441g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 03/08/2024] [Indexed: 04/28/2024] Open
Abstract
The discovery of new antibacterials within the vast chemical space is crucial in combating drug-resistant bacteria such as methicillin-resistant Staphylococcus aureus (MRSA). However, the traditional approach of screening the entire chemical library in an ergodic manner can be laborious and time-consuming. Machine learning-assisted screening of antibacterials alleviates the exploration effort but suffers from the lack of reliable and related datasets. To address these challenges, we devised a combinatorial library comprising over 110 000 candidates based on the Ugi reaction. A focused library was subsequently generated through uniform sampling of the entire library to narrow down the preliminary screening scale. A novel feature-fusion architecture called the latent space constraint neural network was developed which incorporated both fingerprint and physicochemical molecular descriptors to predict the antibacterial properties. This integration allowed the model to leverage the complementary information provided by these descriptors and improve the accuracy of predictions. Three lead compounds that demonstrated excellent efficacy against MRSA while alleviating drug resistance were identified. This workflow highlights the integration of machine learning with the combinatorial chemical library to expedite high-quality data collection and extensive data mining for antibacterial screening.
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Affiliation(s)
- Cong Wang
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University Hangzhou Zhejiang 310027 PR China
- International Research Center for X Polymers, International Campus, Zhejiang University Haining Zhejiang 314400 PR China
| | - Yuhui Wu
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University Hangzhou Zhejiang 310027 PR China
- International Research Center for X Polymers, International Campus, Zhejiang University Haining Zhejiang 314400 PR China
| | - Yunfan Xue
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University Hangzhou Zhejiang 310027 PR China
| | - Lingyun Zou
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University Hangzhou Zhejiang 310027 PR China
| | - Yue Huang
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University Hangzhou Zhejiang 310027 PR China
| | - Peng Zhang
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University Hangzhou Zhejiang 310027 PR China
- International Research Center for X Polymers, International Campus, Zhejiang University Haining Zhejiang 314400 PR China
- State Key Laboratory of Transvascular Implantation Devices, Zhejiang University Hangzhou Zhejiang 311202 P. R. China
| | - Jian Ji
- MOE Key Laboratory of Macromolecule Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University Hangzhou Zhejiang 310027 PR China
- International Research Center for X Polymers, International Campus, Zhejiang University Haining Zhejiang 314400 PR China
- State Key Laboratory of Transvascular Implantation Devices, Zhejiang University Hangzhou Zhejiang 311202 P. R. China
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Tan Z, Yang W, O'Brien NA, Pan X, Ramadan S, Marsh T, Hammer N, Cywes-Bentley C, Vinacur M, Pier GB, Gildersleeve JC, Huang X. A comprehensive synthetic library of poly-N-acetyl glucosamines enabled vaccine against lethal challenges of Staphylococcus aureus. Nat Commun 2024; 15:3420. [PMID: 38658531 PMCID: PMC11043332 DOI: 10.1038/s41467-024-47457-4] [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: 10/19/2023] [Accepted: 04/03/2024] [Indexed: 04/26/2024] Open
Abstract
Poly-β-(1-6)-N-acetylglucosamine (PNAG) is an important vaccine target, expressed on many pathogens. A critical hurdle in developing PNAG based vaccine is that the impacts of the number and the position of free amine vs N-acetylation on its antigenicity are not well understood. In this work, a divergent strategy is developed to synthesize a comprehensive library of 32 PNAG pentasaccharides. This library enables the identification of PNAG sequences with specific patterns of free amines as epitopes for vaccines against Staphylococcus aureus (S. aureus), an important human pathogen. Active vaccination with the conjugate of discovered PNAG epitope with mutant bacteriophage Qβ as a vaccine carrier as well as passive vaccination with diluted rabbit antisera provides mice with near complete protection against infections by S. aureus including methicillin-resistant S. aureus (MRSA). Thus, the comprehensive PNAG pentasaccharide library is an exciting tool to empower the design of next generation vaccines.
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Affiliation(s)
- Zibin Tan
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI, 48824, USA
- Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI, 48824, USA
- Center for Cancer Immunology, Faculty of Pharmaceutical Sciences, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences (CAS), Shenzhen, Guangdong, 518000, China
| | - Weizhun Yang
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI, 48824, USA
- Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI, 48824, USA
- School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, Zhejiang, 310024, China
| | - Nicholas A O'Brien
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD, 21702, USA
| | - Xingling Pan
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI, 48824, USA
- Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI, 48824, USA
| | - Sherif Ramadan
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI, 48824, USA
- Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI, 48824, USA
- Chemistry Department, Faculty of Science, Benha University, Benha, Qaliobiya, 13518, Egypt
| | - Terence Marsh
- Department of Microbiology, Genetics & Immunology, Michigan State University, East Lansing, MI, 48824, USA
| | - Neal Hammer
- Department of Microbiology, Genetics & Immunology, Michigan State University, East Lansing, MI, 48824, USA
| | - Colette Cywes-Bentley
- Division of Infectious Diseases, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Mariana Vinacur
- Division of Infectious Diseases, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Gerald B Pier
- Division of Infectious Diseases, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Jeffrey C Gildersleeve
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD, 21702, USA
| | - Xuefei Huang
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI, 48824, USA.
- Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI, 48824, USA.
- Department of Biomedical Engineering, Michigan State University, East Lansing, MI, 48824, USA.
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Tang YW, Hon PY, Tan J, Poh BF, Ang B, Chow A. Octenidine exposure was not associated with reduced octenidine susceptibility of meticillin-resistant Staphylococcus aureus in an extended-care facility in Singapore. J Hosp Infect 2024; 149:104-107. [PMID: 38670494 DOI: 10.1016/j.jhin.2024.02.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 02/21/2024] [Accepted: 02/22/2024] [Indexed: 04/28/2024]
Abstract
OBJECTIVES Antiseptics such as chlorhexidine gluconate (CHG) and octenidine dihydrochloride (OCT) are frequently used in hospitals to prevent and control the transmission of meticillin-resistant Staphylococcus aureus (MRSA). Given the increasing prevalence of reduced CHG susceptibility of MRSA, there are concerns about the possibility of reduced OCT susceptibility. This study evaluated the prevalence of reduced CHG and OCT susceptibility over 3 years, and assessed the association between OCT exposure and reduced OCT susceptibility in MRSA. METHODS MRSA isolates from inpatients who acquired MRSA in an extended-care facility between 2019 and 2021 were included in antiseptic susceptibility testing. Inpatients were exposed to universal daily CHG bathing from January to September 2019, and universal daily OCT bathing after October 2019. The minimum inhibitory concentrations (MICs) of CHG and OCT were determined using the broth microdilution method. Multi-variable logistic regression was used to assess if OCT exposure was independently associated with reduced OCT susceptibility. RESULTS Of 186 isolates, 179 (96%) had reduced CHG susceptibility (MIC ≥4 mg/L) and 46 (25%) had reduced OCT susceptibility (MIC ≥2 mg/L). Reduced OCT susceptibility rates were 26.9%, 13.8% and 14.3% in 2019, 2020 and 2021, respectively. Reduced CHG susceptibility rates were 95.4%, 100% and 95.9% in 2019, 2020 and 2021, respectively. OCT exposure was not associated with reduced OCT susceptibility (adjusted odds ratio 0.23, 95% confidence interval 0.08-0.75; P=0.014), after adjusting for age, gender, race, year of sample collection, days at risk in facility, hospitalization in preceding year, and MRSA colonization/infection in preceding year. CONCLUSION The prevalence of reduced OCT susceptibility has remained low, despite universal OCT bathing for extended inpatient care. However, the rate of reduced CHG susceptibility was high. OCT exposure was not associated with reduced OCT susceptibility in MRSA.
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Affiliation(s)
- Y W Tang
- Department of Preventive and Population Medicine, Office of Clinical Epidemiology, Analytics and Knowledge, Tan Tock Seng Hospital, Singapore, Singapore
| | - P Y Hon
- Infectious Disease Research Laboratory, National Centre for Infectious Diseases, Singapore, Singapore
| | - J Tan
- Department of Infection Prevention and Control, Tan Tock Seng Hospital, Singapore, Singapore
| | - B F Poh
- Department of Infection Prevention and Control, Tan Tock Seng Hospital, Singapore, Singapore
| | - B Ang
- Department of Infection Prevention and Control, Tan Tock Seng Hospital, Singapore, Singapore; Department of Infectious Diseases, Tan Tock Seng Hospital, Singapore, Singapore
| | - A Chow
- Department of Preventive and Population Medicine, Office of Clinical Epidemiology, Analytics and Knowledge, Tan Tock Seng Hospital, Singapore, Singapore; Respiratory and Infectious Disease Programme, Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore; Infectious Disease Research and Training Office, National Centre for Infectious Diseases, Singapore, Singapore; Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore.
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Piper KR, Ikhimiukor OO, Souza SSR, Garcia-Aroca T, Andam CP. Evolutionary dynamics of the accessory genomes of Staphylococcus aureus. mSphere 2024; 9:e0075123. [PMID: 38501935 PMCID: PMC11036810 DOI: 10.1128/msphere.00751-23] [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: 12/01/2023] [Accepted: 02/24/2024] [Indexed: 03/20/2024] Open
Abstract
Staphylococcus aureus is a ubiquitous commensal and opportunistic bacterial pathogen that can cause a wide gamut of infections, which are exacerbated by the presence of multidrug-resistant and methicillin-resistant S. aureus. S. aureus is genetically heterogeneous and consists of numerous distinct lineages. Using 558 complete genomes of S. aureus, we aim to determine how the accessory genome content among phylogenetic lineages of S. aureus is structured and has evolved. Bayesian hierarchical clustering identified 10 sequence clusters, of which seven contained major sequence types (ST 1, 5, 8, 30, 59, 239, and 398). The seven sequence clusters differed in their accessory gene content, including genes associated with antimicrobial resistance and virulence. Focusing on the two largest clusters, BAPS8 and BAPS10, and each consisting mostly of ST5 and ST8, respectively, we found that the structure and connected components in the co-occurrence networks of accessory genomes varied between them. These differences are explained, in part, by the variation in the rates at which the two sequence clusters gained and lost accessory genes, with the highest rate of gene accumulation occurring recently in their evolutionary histories. We also identified a divergent group within BAPS10 that has experienced high gene gain and loss early in its history. Together, our results show highly variable and dynamic accessory genomes in S. aureus that are structured by the history of the specific lineages that carry them.IMPORTANCEStaphylococcus aureus is an opportunistic, multi-host pathogen that can cause a variety of benign and life-threatening infections. Our results revealed considerable differences in the structure and evolution of the accessory genomes of major lineages within S. aureus. Such genomic variation within a species can have important implications on disease epidemiology, pathogenesis of infection, and interactions with the vertebrate host. Our findings provide important insights into the underlying genetic basis for the success of S. aureus as a highly adaptable and resistant pathogen, which will inform current efforts to control and treat staphylococcal diseases.
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Affiliation(s)
- Kathryn R. Piper
- Department of Biological Sciences, University at Albany, State University of New York, Albany, New York, USA
| | - Odion O. Ikhimiukor
- Department of Biological Sciences, University at Albany, State University of New York, Albany, New York, USA
| | - Stephanie S. R. Souza
- Department of Biological Sciences, University at Albany, State University of New York, Albany, New York, USA
| | - Teddy Garcia-Aroca
- Department of Biological Sciences, University at Albany, State University of New York, Albany, New York, USA
- Department of Plant Pathology, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
| | - Cheryl P. Andam
- Department of Biological Sciences, University at Albany, State University of New York, Albany, New York, USA
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Uc-Cachón AH, Calvo-Irabien LM, Dzul-Beh ADJ, Dzib-Baak HE, Grijalva-Arango R, Molina-Salinas GM. Potential Anti-Infectious Activity of Essential Oil Chemotypes of Lippia origanoides Kunth on Antibiotic-Resistant Staphylococcus aureus Strains. PLANTS (BASEL, SWITZERLAND) 2024; 13:1172. [PMID: 38732387 PMCID: PMC11085919 DOI: 10.3390/plants13091172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 04/16/2024] [Accepted: 04/20/2024] [Indexed: 05/13/2024]
Abstract
Staphylococcus aureus infections are prevalent in healthcare and community environments. Methicillin-resistant S. aureus is catalogued as a superbug of high priority among the pathogens. This Gram-positive coccus can form biofilms and produce toxins, leading to persistent infection and antibiotic resistance. Limited effective antibiotics have encouraged the development of innovative strategies, with a particular emphasis on resistance mechanisms and/or virulence factors. Medicinal aromatic plants have emerged as promising alternative sources. This study investigated the antimicrobial, antibiofilm, and antihemolysis properties of three different chemotypes of Lippia origanoides essential oil (EO) against susceptible and drug-resistant S. aureus strains. The chemical composition of the EO was analyzed using GC-MS, revealing high monoterpene concentrations, with carvacrol and thymol as the major components in two of the chemotypes. The third chemotype consisted mainly of the sesquiterpene β-caryophyllene. The MIC values for the two monoterpene chemotypes ranged from 62.5 to 500 µg/mL for all strains, whereas the sesquiterpene chemotype showed activity against seven strains at concentrations of 125-500 µg/mL, which is the first report of its anti-S. aureus activity. The phenolic chemotypes inhibited biofilm formation in seven S. aureus strains, whereas the sesquiterpene chemotype only inhibited biofilm formation in four strains. In addition, phenolic chemotypes displayed antihemolysis activity, with IC50 values ranging from 58.9 ± 3.8 to 128.3 ± 9.2 µg/mL. Our study highlights the importance of L. origanoides EO from the Yucatan Peninsula, which has the potential for the development of anti-S. aureus agents.
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Affiliation(s)
- Andrés Humberto Uc-Cachón
- Unidad de Investigación Médica Yucatán, Instituto Mexicano del Seguro Social, Mérida 97150, Yucatán, Mexico; (A.H.U.-C.); (A.d.J.D.-B.); (H.E.D.-B.)
| | - Luz María Calvo-Irabien
- Unidad de Recursos Naturales, Centro de Investigación Científica de Yucatán, Mérida 97204, Yucatán, Mexico;
| | - Angel de Jesús Dzul-Beh
- Unidad de Investigación Médica Yucatán, Instituto Mexicano del Seguro Social, Mérida 97150, Yucatán, Mexico; (A.H.U.-C.); (A.d.J.D.-B.); (H.E.D.-B.)
| | - Haziel Eleazar Dzib-Baak
- Unidad de Investigación Médica Yucatán, Instituto Mexicano del Seguro Social, Mérida 97150, Yucatán, Mexico; (A.H.U.-C.); (A.d.J.D.-B.); (H.E.D.-B.)
| | - Rosa Grijalva-Arango
- Unidad de Recursos Naturales, Centro de Investigación Científica de Yucatán, Mérida 97204, Yucatán, Mexico;
| | - Gloria María Molina-Salinas
- Unidad de Investigación Médica Yucatán, Instituto Mexicano del Seguro Social, Mérida 97150, Yucatán, Mexico; (A.H.U.-C.); (A.d.J.D.-B.); (H.E.D.-B.)
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Limboo KH, Singh B. Antibiotic potentiating effect of Bauhinia purpurea L. against multidrug resistant Staphylococcus aureus. Front Microbiol 2024; 15:1385268. [PMID: 38694794 PMCID: PMC11062131 DOI: 10.3389/fmicb.2024.1385268] [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: 02/12/2024] [Accepted: 03/26/2024] [Indexed: 05/04/2024] Open
Abstract
Bauhinia purpurea L. is a medium-sized tree from the family Fabaceae. The plant is traditionally used as medicine by different tribes in Sikkim. The present study aimed to evaluate the modulation in minimum inhibitory concentration (MIC) of the bark methanol extract of Bauhinia purpurea L. against the clinical isolates of multidrug resistant Staphylococcus aureus. The synergistic activity of the test plant extract with different classes of antibiotics was also evaluated. The methanol extract of Bauhinia purpurea exhibited modulation by a 16-fold reduction in the MIC of clindamycin against both resistant and susceptible isolates, followed by penicillin and gentamicin, whereas a maximum of only a 4-fold MIC reduction was observed with ciprofloxacin. The lowest minimum inhibitory concentration and minimum bactericidal concentration showed by the plant extract was 0.48 and 0.97 mg/mL, respectively. The methanol extract of Bauhinia purpurea exhibited synergistic activity with penicillin, gentamicin, ciprofloxacin, and clindamycin against most of the tested isolates of multidrug-resistant Staphylococcus aureus (MDR-SA). Gas chromatography-mass spectrometry analysis of Bauhinia purpurea L. bark methanol extract revealed 16 phytocompounds. The results provide an insight into the potential antibacterial property of the plant extract in terms of its antibiotic MIC modulation and synergistic properties with the selected antibiotics. This is the first report of the antibiotic potentiation property of Bauhinia purpurea L., collected from Sikkim, India.
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Affiliation(s)
| | - Bimala Singh
- Department of Microbiology, School of Life Sciences, Sikkim University, Gangtok, Sikkim, India
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Du M, He X, Wang D, Jiang Z, Zhao X, Shen J. An NIR-II-enhanced nanozyme to promote wound healing in methicillin-resistant Staphylococcus aureus infections. Acta Biomater 2024; 179:300-312. [PMID: 38518865 DOI: 10.1016/j.actbio.2024.03.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 03/11/2024] [Accepted: 03/13/2024] [Indexed: 03/24/2024]
Abstract
Deep tissue bacterial infections, especially methicillin-resistant Staphylococcus aureus (MRSA) infections, pose challenges to clinical therapy due to their low debridement efficiency and relapsing. Molybdenum disulfide (MoS2) is used in the antibacterial field as a classic photothermal agent (NIR-I) with good biocompatibility. However, due to its limited NIR-I tissue penetration ability and single treatment mode, MoS2 has poor therapeutic effects on deep tissue infection. Herein, we prepared a defect-type hybrid 2H-MoS2 nanozyme (MoWS2) using hydrothermal method fabricate the MoWS2 composite, which is a new antibacterial strategy involving photothermal and enzyme catalysis, and further enhances the activity of the nanozyme through overheating. The regulation of 2H-MoS2 defects through tungsten ion doping endows MoWS2 with better near-infrared two-region absorption (NIR-II) and enzyme catalytic performance. Antibacterial activity experiments in vitro have shown that MoWS2 can achieve efficient bactericidal activity and biofilm clearance through hyperthermia and reactive oxygen species (ROS). Deep MRSA infection experiments have shown that MoWS2 rapidly removes bacteria from subcutaneous infected tissues through photothermal therapy (PTT) and chemodynamic therapy (CDT), accelerates the dissipation of abscesses, and promotes the healing of infected wounds. Additionally, the versatile treatment mode of MoWS2 was further confirmed through tissue sectioning and immunofluorescence staining analysis. Overall, these results provide a feasible approach for achieving efficient treatment of deep tissue infections through tungsten ion doping to regulate defective 2H-MoS2. STATEMENT OF SIGNIFICANCE: The photothermal effect of MoS2 nanosheets in the NIR-I (650-900 nm) window in anti-MRSA therapy is considered to be highly reliable and efficient in PTA. However, most of the developed PPT therapies or antimicrobial systems based on PTT therapies developed with 1T-MoS2 have in vivo sterilization temperatures of more than 55°C, which have the risk of damaging the normal tissues of the skin. In this study, we prepared W@MoS2 with a good photothermal effect (36.9%) in the NIR-II window and good peroxidase-like activity. The combined effect of PTT and CDT has a stronger bactericidal effect while avoiding high-temperature damage, which makes the W@MoS2 material more advantageous in terms of antimicrobial effect.
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Affiliation(s)
- Mengxuan Du
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
| | - Xiaojun He
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China
| | - Danyan Wang
- Zhejiang Engineering Research Center for Tissue Repair Materials, Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, Zhejiang 325001, China
| | - Zhengting Jiang
- Zhejiang Engineering Research Center for Tissue Repair Materials, Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, Zhejiang 325001, China
| | - Xiaoliang Zhao
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China.
| | - Jianliang Shen
- National Engineering Research Center of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou 325027, China; Zhejiang Engineering Research Center for Tissue Repair Materials, Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou, Zhejiang 325001, China.
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