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Mukherjee K, Rahman A, Chakraborty J, Pakrashi S. Isolation and characterization of mercury and multidrug-resistant Citrobacter freundii strains from tannery effluents in Kolkata, India. Arch Microbiol 2024; 206:362. [PMID: 39066800 DOI: 10.1007/s00203-024-04090-5] [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: 04/23/2024] [Revised: 07/14/2024] [Accepted: 07/21/2024] [Indexed: 07/30/2024]
Abstract
Mercury (Hg) is one of the most potent toxic heavy metals that distresses livestock, humans, and ecological health. Owing to uncontrolled exposure to untreated tannery industrial effluents, metals such as Hg are increasing in nature and are, therefore, becoming a global concern. As a result, understanding the thriving microflora in that severe condition and their characteristics becomes immensely important. During the course of this study, two Hg-resistant bacteria were isolated from tannery wastewater effluents from leather factories in Kolkata, India, which were able to tolerate 2.211 × 10- 3 M (600 µg/ml) Hg. 16 S rDNA analysis revealed strong sequence homology with Citrobacter freundii, were named as BNC22A and BNC22C for this study. In addition they showed high tolerance to nickel (Ni) and Chromium (Cr) at 6.31 × 10- 3 M (1500 µg/ml) and 6.792 × 10- 3 M (2000 µg/ml) respectively. However, both the isolates were sensitive to arsenic (As) and cadmium (Cd). Furthermore, their antibiotic sensitivity profiles reveal a concerning trend towards resistance to multiple drugs. Overuse and misuse of antibiotics in healthcare systems and agriculture has been identified as two of the main reasons for the decline in efficacy of antibiotics. Though their ability to produce lipase makes them industrially potent organisms, their competence to resist several antibiotics and metals that are toxic makes this study immensely relevant. In addition, their ability to negate heavy metal toxicity makes them potential candidates for bioremediation. Finally, the green mung bean seed germination test showed a significant favourable effect of BNC22A and BNC22C against Hg-stimulated toxicity.
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Affiliation(s)
- Kushal Mukherjee
- Department of Microbiology, Bidhannagar College, Kolkata, West Bengal, 700064, India
| | - Abdul Rahman
- Institute of Genomics and Integrative Biology, New Delhi, India
| | - Joyeeta Chakraborty
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, West Bengal, NH 12, Haringhata, 741249, India
| | - Sourav Pakrashi
- Department of Microbiology, Bidhannagar College, Kolkata, West Bengal, 700064, India.
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Sun Q, Tao S, Bovone G, Han G, Deshmukh D, Tibbitt MW, Ren Q, Bertsch P, Siqueira G, Fischer P. Versatile Mechanically Tunable Hydrogels for Therapeutic Delivery Applications. Adv Healthc Mater 2024; 13:e2304287. [PMID: 38488218 DOI: 10.1002/adhm.202304287] [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: 01/03/2024] [Indexed: 04/02/2024]
Abstract
Hydrogels provide a versatile platform for biomedical material fabrication that can be structurally and mechanically fine-tuned to various tissues and applications. Applications of hydrogels in biomedicine range from highly dynamic injectable hydrogels that can flow through syringe needles and maintain or recover their structure after extrusion to solid-like wound-healing patches that need to be stretchable while providing a selective physical barrier. In this study, a toolbox is designed using thermo-responsive poly(N-isopropylacrylamide) (PNIPAM) polymeric matrices and nanocelluloses as reinforcing agent to obtain biocompatible hydrogels with altering mechanical properties, from a liquid injectable to a solid-like elastic hydrogel. The liquid hydrogels possess low viscosity and shear-thinning properties at 25 °C, which allows facile injection at room temperature, while they become viscoelastic gels at body temperature. In contrast, the covalently cross-linked solid-like hydrogels exhibit enhanced viscoelasticity. The liquid hydrogels are biocompatible and are able to delay the in vitro release and maintain the bioactivity of model drugs. The antimicrobial agent loaded solid-like hydrogels are effective against typical wound-associated pathogens. This work presents a simple method of tuning hydrogel mechanical strength to easily adapt to applications in different soft tissues and broaden the potential of renewable bio-nanoparticles in hybrid biomaterials with controlled drug release capabilities.
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Affiliation(s)
- Qiyao Sun
- Department of Health Science and Technology, ETH Zurich, Zurich, 8092, Switzerland
| | - Siyuan Tao
- Laboratory for Biointerfaces, Empa, St. Gallen, 9014, Switzerland
| | - Giovanni Bovone
- Macromolecular Engineering Laboratory, D-MAVT, ETH Zurich, Zurich, 8092, Switzerland
| | - Garam Han
- Department of Health Science and Technology, ETH Zurich, Zurich, 8092, Switzerland
| | - Dhananjay Deshmukh
- Macromolecular Engineering Laboratory, D-MAVT, ETH Zurich, Zurich, 8092, Switzerland
- Institute for Mechanical Systems, D-MAVT, ETH Zurich, Zurich, 8092, Switzerland
| | - Mark W Tibbitt
- Macromolecular Engineering Laboratory, D-MAVT, ETH Zurich, Zurich, 8092, Switzerland
| | - Qun Ren
- Laboratory for Biointerfaces, Empa, St. Gallen, 9014, Switzerland
| | - Pascal Bertsch
- Drug Delivery and Biophysics of Biopharmaceuticals, Department of Pharmacy, University of Copenhagen, Copenhagen, 2100, Denmark
| | - Gilberto Siqueira
- Cellulose & Wood Materials Laboratory, EMPA, Dübendorf, 8600, Switzerland
| | - Peter Fischer
- Department of Health Science and Technology, ETH Zurich, Zurich, 8092, Switzerland
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Abri S, Durr H, Barton HA, Adkins-Travis K, Shriver LP, Pukale DD, Fulton JA, Leipzig ND. Chitosan-based multifunctional oxygenating antibiotic hydrogel dressings for managing chronic infection in diabetic wounds. Biomater Sci 2024; 12:3458-3470. [PMID: 38836321 PMCID: PMC11197983 DOI: 10.1039/d4bm00355a] [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: 03/08/2024] [Accepted: 05/25/2024] [Indexed: 06/06/2024]
Abstract
Current treatment strategies for infection of chronic wounds often result in compromised healing and necrosis due to antibiotic toxicity, and underlying biomarkers affected by treatments are not fully known. Here, a multifunctional dressing was developed leveraging the unique wound-healing properties of chitosan, a natural polysaccharide known for its numerous benefits in wound care. The dressing consists of an oxygenating perfluorocarbon functionalized methacrylic chitosan (MACF) hydrogel incorporated with antibacterial polyhexamethylene biguanide (PHMB). A non-healing diabetic infected wound model with emerging metabolomics tools was used to explore the anti-infective and wound healing properties of the resultant multifunctional dressing. Direct bacterial bioburden assessment demonstrated superior antibacterial properties of hydrogels over a commercial dressing. However, wound tissue quality analyses confirmed that sustained PHMB for 21 days resulted in tissue necrosis and disturbed healing. Therefore, a follow-up comparative study investigated the best treatment course for antiseptic application ranging from 7 to 21 days, followed by the oxygenating chitosan-based MACF treatment for the remainder of the 21 days. Bacterial counts, tissue assessments, and lipidomics studies showed that 14 days of application of MACF-PHMB dressings followed by 7 days of MACF dressings provides a promising treatment for managing infected non-healing diabetic skin ulcers.
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Affiliation(s)
- Shahrzad Abri
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325, USA.
| | - Hannah Durr
- Integrated Biosciences Program, Department of Biology, The University of Akron, Akron, Ohio 44325, USA
| | - Hazel A Barton
- Department of Geological Sciences, The University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Kayla Adkins-Travis
- Department of Chemistry, Washington University in Saint Louis, Saint Louis, MO 63130, USA
| | - Leah P Shriver
- Department of Chemistry, Washington University in Saint Louis, Saint Louis, MO 63130, USA
- Center for Proteomics, Metabolomics, and Isotope Tracing, Washington University in Saint Louis, Saint Louis, MO 63130, USA
- Department of Medicine, Washington University in Saint Louis, Saint Louis, MO 63130, USA
| | - Dipak D Pukale
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325, USA.
| | - Judith A Fulton
- Summa Health System-Translational Research Center Akron, Akron, Ohio 44304, USA
- Northeast Ohio Medical University-REDIzone, Rootstown, Ohio 44272, USA
| | - Nic D Leipzig
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Akron, Ohio 44325, USA.
- Integrated Biosciences Program, Department of Biology, The University of Akron, Akron, Ohio 44325, USA
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Evren E, Oğuzman E, Us E, Karahan ZC. Q-Scoring System for the Evaluation of the Superficial Wound Swab Samples: A Clinical Microbiological Aspect. Indian J Microbiol 2024; 64:205-212. [PMID: 38468750 PMCID: PMC10924851 DOI: 10.1007/s12088-023-01161-x] [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: 10/14/2022] [Accepted: 11/19/2023] [Indexed: 03/13/2024] Open
Abstract
Purpose Wound swab cultures are frequently requested from patients suspected of having a wound infection. The quality of the sample should also be evaluated by performing a Gram-stained microscopic examination. "Q-scoring system" is not widely used and the literature on the subject is limited. Methods A total of 4648 wound swab samples were evaluated. Samples with a Q-score of "0" were considered as "poor quality samples", and those with a score of " ≥ 1" were classified as "good quality samples". Microorganisms grown in the culture of samples that scored above one were identified by mass spectrometry, and antimicrobial susceptibility testing was performed. Results Gram stain results were found to be consistent with the culture result in 57.10% (n = 1078) of and inconsistent with the culture result in 42.90% (n = 813) of the samples. The number of samples with Q-scores one, two, and three among the 813 samples was 62, 29, and 722, respectively. The value observed in Q3 was found to be statistically significantly higher than the values observed in Q1 and Q2 (p < 0.05). Samples sent from surgical departments (61.92%) with a Q-score of ≥ 1, were statistically significant compared to internal medicine departments (p < 0.0001). There was no significant difference between samples sent from intensive care units and those sent from other inpatient services. For both groups with Q-scores ≥ 1 and "0" similar microorganisms were identified. Conclusion As a conclusion, the Q-scoring system will provide a common language between the laboratory and the clinic, especially by standardizing the evaluation of wound swab samples.
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Affiliation(s)
- Ebru Evren
- Ankara University School of Medicine Department of Medical Microbiology and Ibn-i Sina Hospital Central Microbiology Laboratory, Hacettepe Mahallesi, Talatpaşa Bulvarı No:82, 06230 Altındağ, Ankara, Turkey
| | - Elif Oğuzman
- Ankara University School of Medicine Department of Medical Microbiology and Ibn-i Sina Hospital Central Microbiology Laboratory, Hacettepe Mahallesi, Talatpaşa Bulvarı No:82, 06230 Altındağ, Ankara, Turkey
| | - Ebru Us
- Ankara University School of Medicine Department of Medical Microbiology and Ibn-i Sina Hospital Central Microbiology Laboratory, Hacettepe Mahallesi, Talatpaşa Bulvarı No:82, 06230 Altındağ, Ankara, Turkey
| | - Zeynep Ceren Karahan
- Ankara University School of Medicine Department of Medical Microbiology and Ibn-i Sina Hospital Central Microbiology Laboratory, Hacettepe Mahallesi, Talatpaşa Bulvarı No:82, 06230 Altındağ, Ankara, Turkey
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Soni J, Sinha S, Pandey R. Understanding bacterial pathogenicity: a closer look at the journey of harmful microbes. Front Microbiol 2024; 15:1370818. [PMID: 38444801 PMCID: PMC10912505 DOI: 10.3389/fmicb.2024.1370818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 02/05/2024] [Indexed: 03/07/2024] Open
Abstract
Bacteria are the most prevalent form of microorganisms and are classified into two categories based on their mode of existence: intracellular and extracellular. While most bacteria are beneficial to human health, others are pathogenic and can cause mild to severe infections. These bacteria use various mechanisms to evade host immunity and cause diseases in humans. The susceptibility of a host to bacterial infection depends on the effectiveness of the immune system, overall health, and genetic factors. Malnutrition, chronic illnesses, and age-related vulnerabilities are the additional confounders to disease severity phenotypes. The impact of bacterial pathogens on public health includes the transmission of these pathogens from healthcare facilities, which contributes to increased morbidity and mortality. To identify the most significant threats to public health, it is crucial to understand the global burden of common bacterial pathogens and their pathogenicity. This knowledge is required to improve immunization rates, improve the effectiveness of vaccines, and consider the impact of antimicrobial resistance when assessing the situation. Many bacteria have developed antimicrobial resistance, which has significant implications for infectious diseases and favors the survival of resilient microorganisms. This review emphasizes the significance of understanding the bacterial pathogens that cause this health threat on a global scale.
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Affiliation(s)
- Jyoti Soni
- Division of Immunology and Infectious Disease Biology, Integrative Genomics of Host Pathogen Laboratory, Council of Scientific & Industrial Research-Institute of Genomics and Integrative Biology, New Delhi, India
- Academy of Scientific and Innovative Research, Ghaziabad, India
| | - Sristi Sinha
- Division of Immunology and Infectious Disease Biology, Integrative Genomics of Host Pathogen Laboratory, Council of Scientific & Industrial Research-Institute of Genomics and Integrative Biology, New Delhi, India
- School of Biosciences and Technology, Vellore Institute of Technology University, Vellore, India
| | - Rajesh Pandey
- Division of Immunology and Infectious Disease Biology, Integrative Genomics of Host Pathogen Laboratory, Council of Scientific & Industrial Research-Institute of Genomics and Integrative Biology, New Delhi, India
- Academy of Scientific and Innovative Research, Ghaziabad, India
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Kilonzi JM, Otieno S. Degradation kinetics and physiological studies of organophosphates degrading microorganisms for soil bioremediation. STRESS BIOLOGY 2024; 4:11. [PMID: 38319394 PMCID: PMC10847075 DOI: 10.1007/s44154-023-00138-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 11/15/2023] [Indexed: 02/07/2024]
Abstract
Organophosphate compounds are widely used in agricultural activities to optimize food production. Contamination of field soil by these compounds may result in detrimental effects on soil biota. The aim of the present study was to isolate microorganisms from field soils and evaluate the strains on ability to degrade organophosphates as single isolate and as a consortium. Isolated strains were identified using both biochemical and molecular techniques. Results revealed that, out of the 46 isolated strains, three isolates herein referred to as S6, S36 and S37 showed an average diazinon degradation rate of 76.4%, 76.7% and 76.8% respectively, of the initial dose (50 ppm) within 11 days of incubation in mineral medium. Notably, isolates S36 and S37 were more effective than S6 in degrading diazinon by 40% in soil aliquot after 11 days and therefore were evaluated on biochemical reactions and molecular identification. The isolates showed variable biochemical characteristics. However, both isolates possessed catalase enzyme, but lacked oxidase enzyme. Molecular characterization showed that, the closest species for S36 and S37 were Priestia megaterium and P. arybattia, respectively, based on 16S rRNA gene similarity (> 99%). Combination of the strains increased diazinon degradation ability by 45% compared to single strain treatment. Chlorpyrifos was the most highly degraded organophosphate, compared to phorate and cadusafos. Therefore it is expected that the pesticide-degrading bacteria could be a solution to soil health improvement and contribution to the production of safe agricultural products.
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Affiliation(s)
- J M Kilonzi
- Kenya Agricultural and Livestock Research Organization Tigoni, Limuru, P.O BOX 338-0217, Kenya.
| | - S Otieno
- Kenya Agricultural and Livestock Research Organization Tigoni, Limuru, P.O BOX 338-0217, Kenya
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Wu Y, Yang Y, Wan M, Chen L, Yuan Y, He J, Zhang B. Paenibacillus glufosinatiresistens sp. nov., a glufosinate-resistant bacterium isolated from sludge. Int J Syst Evol Microbiol 2024; 74. [PMID: 38305710 DOI: 10.1099/ijsem.0.006259] [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: 02/03/2024] Open
Abstract
A Gram-stain-positive bacterium capable of resisting 5.0 mM glufosinate, designated strain YX-27T, was isolated from a sludge sample collected from a factory in Wuxi, Jiangsu, PR China. Cells were rod-shaped, facultatively anaerobic, endospore-forming, and motile by peritrichous flagella. Growth was observed at 15-42 °C (optimum at 30 °C), pH 4.0-8.0 (optimum pH 7.0-7.5) and with 0-2.5% NaCl (w/v; optimum, 0.5 %). Strain YX-27T could tolerate up to 6.0 mM glufosinate. Strain YX-27T showed the highest 16S rRNA gene sequence similarity to Paenibacillus tianjinensis TB2019T (96.17 %), followed by Paenibacillus odorifer DSM 1539T (96.15 %), Paenibacillus sophorae S27T (96.04 %), Paenibacillus apii 7124T (96.02 %) and Paenibacillus stellifer DSM 14472T (95.87 %). The phylogenetic tree based on genome and 16S rRNA gene sequences indicated that strain YX-27T was clustered in the genus Paenibacillus but formed a separate clade. The genome size of YX-27T was 5.22 Mb with a G+C content of 57.5 mol%. The average nucleotide identity and digital DNA-DNA hybridization values between the genomes of strain YX-27T and 12 closely related type strains ranged from 70.8 to 74.8% and 19.8 to 23.0 %, respectively. The major cellular fatty acids were C16 : 0, anteiso-C15 : 0 and iso-C16 : 0. The major polar lipids were one diphosphatidylglycerol, one phosphatidylethanolamine, one phosphatidylglycerol, one phospholipid, four aminophospholipids and four unidentified lipids. The predominant respiratory quinone was MK-7. Based on phylogenetic, genomic, chemotaxonomic and phenotypic data, strain YX-27T was considered to represent a novel species for which the name Paenibacillus glufosinatiresistens sp. nov. is proposed, with YX-27T (=MCCC 1K08803T= KCTC 43611T) as the type strain.
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Affiliation(s)
- Yan Wu
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China
| | - Yuwen Yang
- Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing, PR China
| | - Minglai Wan
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China
- Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing, PR China
| | - Le Chen
- Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing, PR China
| | - Ye Yuan
- Cuiying Honors College, Lanzhou University, Lanzhou 730000, Gansu, PR China
| | - Jian He
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, PR China
- Agricultural Microbial Resources Protection and Germplasm Innovation and Utilization Center of Jiangsu Province, Nanjing, Jiangsu 210095, PR China
| | - Baolong Zhang
- Institute of Germplasm Resources and Biotechnology, Jiangsu Academy of Agricultural Sciences, Nanjing, PR China
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Shi X, Qiu S, Ji L, Lu H, Wu S, Chen Q, Zou X, Hu Q, Feng T, Chen S, Cui W, Xu S, Jiang M, Cai R, Geng Y, Bai Q, Huang D, Liu P. Pathogenetic characterization of a Micrococcus luteus strain isolated from an infant. Front Pediatr 2023; 11:1303040. [PMID: 38188910 PMCID: PMC10770869 DOI: 10.3389/fped.2023.1303040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 12/04/2023] [Indexed: 01/09/2024] Open
Abstract
Purpose To explore the clinical characteristics of Micrococcus luteus bloodstream infection in an infant and characterize the phenotype and genotype of the isolated strains, as well as seek suitable infection models for assessing virulence. Methods Clinical data was collected from an infant patient diagnosed with M. luteus bloodstream infection. Metagenomic sequencing was performed on the isolated blood sample. The strain was isolated and underwent mass spectrometry, biochemical tests, antibiotic susceptibility assays, and whole-genome sequencing. The Galleria mellonella infection model was used to assess M. luteus virulence. Results Patient responded poorly to cephalosporins, but recovered after Linezolid treatment. Metagenomic sequencing identified M. luteus as the predominant species in the sample, confirming infection. They were identified as M. luteus with a high confidence level of 98.99% using mass spectrometry. The strain showed positive results for Catalase, Oxidase, and Urea tests, and negative results for Mannose, Xylose, Lactose, Mannitol, Arginine, and Galactose tests, consistent with the biochemical profile of M. luteus reference standards. M. luteus susceptibility to 15 antibiotics was demonstrated and no resistance genes were detected. Predicted virulence genes, including clpB, were associated with metabolic pathways and the type VI secretion system. The infection model demonstrated dose-dependent survival rates. Conclusion The infant likely developed a bloodstream infection with M. luteus due to compromised immunity. Although the isolated strain is sensitive to cephalosporin antibiotics and has low pathogenicity in infection models, clinical treatment with cephalosporins was ineffective. Linezolid proved to be effective, providing valuable guidance for future clinical management of such rare infections.
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Affiliation(s)
- Xiaolu Shi
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Shuxiang Qiu
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Liyin Ji
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Huiqun Lu
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Shuang Wu
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Qiongcheng Chen
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Xuan Zou
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Qinghua Hu
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
- Shenzhen Research Center for Communicable Disease Control and Prevention, Chinese Academy of Medical Sciences, Shenzhen, China
| | - Tiejian Feng
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Shiting Chen
- School of Public Health, Shanxi Medical University, Taiyuan, China
| | - Wenkai Cui
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Shiqin Xu
- School of Public Health, Shanxi Medical University, Taiyuan, China
| | - Min Jiang
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Rui Cai
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Yijie Geng
- Shenzhen Center for Disease Control and Prevention, Shenzhen, China
| | - Qinqin Bai
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China
| | - Dingjie Huang
- School of Public Health, Shanxi Medical University, Taiyuan, China
| | - Peihui Liu
- Pediatric Department, Shenzhen Maternity and Child Healthcare Hospital, Shenzhen, China
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Sarmento ACA, Fernandes FS, Maia RR, de Araújo Santos Camargo JD, de Oliveira Crispim JC, Eleutério Júnior J, Gonçalves AK. Microablative fractional radiofrequency for sexual dysfunction and vaginal Trophism: A randomized clinical trial. Clinics (Sao Paulo) 2023; 78:100293. [PMID: 37839177 PMCID: PMC10589764 DOI: 10.1016/j.clinsp.2023.100293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 09/28/2023] [Accepted: 10/02/2023] [Indexed: 10/17/2023] Open
Abstract
OBJECTIVES To evaluate Microablative Fractional Radiofrequency (MAFRF) as a possible option in treating vaginal atrophy. METHODS This was a randomized, controlled clinical trial with postmenopausal women diagnosed with vaginal atrophy. The treatment consisted of three sessions of MAFRF, compared to vaginal estrogen administration and an untreated control group. Assessments occurred at baseline and 90 days. The primary endpoints were sexual function, evaluated by the Female Sexual Function Index (FSFI), and vaginal health, assessed by the Vaginal Health Index (VHI). Secondary outcomes included vaginal microbiota composition (Nugent score) and epithelial cell maturation (Maturation Value ‒ MV). RESULTS One hundred and twenty women (40 in each group) were included. Concerning the FSFI, both groups, MAFRF (median 4.8 [3.6‒6.0]) and vaginal estrogen (mean 4.7 ± 1.1), experienced improved sexual desire when compared to the control group (median 3.6 [2.4‒4.8]). Regarding the total score of VHI, the authors observed an improvement in the mean of the MAFRF (23.7 ± 2.0) and vaginal estrogen groups (23.5 ± 1.9) when compared to the control (14.8 ± 2.9). The Nugent score was reduced in the MAFRF and estrogen groups (p < 0.01) compared to the control group. Lastly, the MV was modified after treatment with MAFRF (p < 0.01) and vaginal estrogen (p < 0.001). No differences existed between the MAFRF and vaginal estrogen groups in the studied variables. No adverse effects were reported following the MAFRF protocol. CONCLUSIONS Radiofrequency was comparable in efficacy to estrogen administration for treating vulvovaginal atrophy. It deserves consideration as a viable option in managing this condition.
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Affiliation(s)
- Ayane Cristine Alves Sarmento
- Health Sciences Postgraduate Program, Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN, Brazil; Department of Clinical Analysis and Toxicology, Universidade Federal do Rio Grande do Norte (UFRN), Natal, Brazil
| | - Fabíola Sephora Fernandes
- Department of Clinical Analysis and Toxicology, Universidade Federal do Rio Grande do Norte (UFRN), Natal, Brazil
| | - Rafaella Rêgo Maia
- Health Sciences Postgraduate Program, Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN, Brazil
| | | | | | - José Eleutério Júnior
- Departamento Obstetrics and Gynaecology, Universidade Federal do Ceara, Ceara, CE, Brazil
| | - Ana Kataherine Gonçalves
- Health Sciences Postgraduate Program, Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN, Brazil; Department of Obstetrics and Gynaecology, Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN, Brazil.
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10
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Liu R, Cui H, Geng X, Shi L, Zhu L, Li Z, Li J. Antibiotic Delivery System for Treating Bacteria-Induced Anterior Blepharitis. ACS Infect Dis 2023; 9:2005-2015. [PMID: 37788827 DOI: 10.1021/acsinfecdis.3c00299] [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: 10/05/2023]
Abstract
The eyelid-related disease of blepharitis remains a tricky ocular disorder and affects patient compliance. However, there is no available and effective treatment, making it extremely challenging. Herein, an antibacterial system based on antibiotic delivery was developed and applied in a blepharitis model induced by bacteria. The antibacterial tests against Staphylococcus aureus both in vitro and in vivo demonstrated that the system shows a favorable bactericidal effect. Then, histological evaluation indicated that the system shows both antibacterial and anti-inflammatory effects. This facile design provided an effective ocular infection management, which displays a promising prospect while addressing other complex ocular disorders.
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Affiliation(s)
- Ruixing Liu
- Henan Eye Hospital, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, 450003 Zhengzhou, China
| | - Haohao Cui
- Henan Eye Hospital, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, 450003 Zhengzhou, China
| | - Xingchen Geng
- Henan Eye Hospital, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, 450003 Zhengzhou, China
| | - Liuqi Shi
- Henan Eye Hospital, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, 450003 Zhengzhou, China
| | - Lei Zhu
- Henan Eye Hospital, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, 450003 Zhengzhou, China
| | - Zhanrong Li
- Henan Eye Hospital, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, 450003 Zhengzhou, China
| | - Jingguo Li
- Henan Eye Hospital, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, 450003 Zhengzhou, China
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11
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Goubet AG. Could the tumor-associated microbiota be the new multi-faceted player in the tumor microenvironment? Front Oncol 2023; 13:1185163. [PMID: 37287916 PMCID: PMC10242102 DOI: 10.3389/fonc.2023.1185163] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 05/02/2023] [Indexed: 06/09/2023] Open
Abstract
Microorganisms have been identified in tumor specimens for over a century. It is only in recent years that tumor-associated microbiota has become a rapidly expanding field. Assessment techniques encompass methods at the frontiers of molecular biology, microbiology, and histology, requiring a transdisciplinary process to carefully decipher this new component of the tumor microenvironment. Due to the low biomass, the study of tumor-associated microbiota poses technical, analytical, biological, and clinical challenges and must be approached as a whole. To date, several studies have begun to shed light on the composition, functions, and clinical relevance of the tumor-associated microbiota. This new piece of the tumor microenvironment puzzle could potentially change the way we think about and treat patients with cancer.
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Affiliation(s)
- Anne-Gaëlle Goubet
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
- AGORA Cancer Research Center, Lausanne, Switzerland
- Swiss Cancer Center Léman, Lausanne, Switzerland
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12
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Altun N, Hervello MF, Lombó F, González P. Using staining as reference for spectral imaging: Its application for the development of an analytical method to predict the presence of bacterial biofilms. Talanta 2023; 261:124655. [PMID: 37196402 DOI: 10.1016/j.talanta.2023.124655] [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: 02/16/2023] [Revised: 04/25/2023] [Accepted: 05/05/2023] [Indexed: 05/19/2023]
Abstract
At present, although spectral imaging is known to have a great potential to provide a massive amount of valuable information, the lack of reference methods remains as one of the bottlenecks to access the full capacity of this technique. This work aims to present a staining-based reference method with digital image treatment for spectral imaging, in order to propose a fast, efficient, contactless and non-invasive analytical method to predict the presence of biofilms. Spectral images of Pseudomonasaeruginosa biofilms formed on high density polyethylene coupons were acquired in visible and near infrared (vis-NIR) range between 400 and 1000 nm. Crystal violet staining served as a biofilm indicator, allowing the bacterial cells and the extracellular matrix to be marked on the coupon. Treated digital images of the stained biofilms were used as a reference. The size and pixels of the hyperspectral and digital images were scaled and matched to each other. Intensity color thresholds were used to differentiate the pixels associate to areas containing biofilms from those ones placed in biofilm-free areas. The model facultative Gram-negative bacterium, P. aeruginosa, which can form highly irregularly shaped and heterogeneous biofilm structures, was used to enhance the strength of the method, due to its inherent difficulties. The results showed that the areas with high and low intensities were modeled with good performance, but the moderate intensity areas (with potentially weak or nascent biofilms) were quite challenging. Image processing and artificial neural networks (ANN) methods were performed to overcome the issues resulted from biofilm heterogeneity, as well as to train the spectral data for biofilm predictions.
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Affiliation(s)
- Nazan Altun
- ASINCAR Agrifood Technology Center, Spain; Research Unit "Biotechnology in Nutraceuticals and Bioactive Compounds-BIONUC", Departamento de Biología Funcional, Área de Microbiología, Universidad de Oviedo, Oviedo, Spain; Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain
| | | | - Felipe Lombó
- Research Unit "Biotechnology in Nutraceuticals and Bioactive Compounds-BIONUC", Departamento de Biología Funcional, Área de Microbiología, Universidad de Oviedo, Oviedo, Spain; Instituto Universitario de Oncología del Principado de Asturias (IUOPA), Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain.
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Li J, Leung SYS, Chung YL, Chow SKH, Alt V, Rupp M, Brochausen C, Chui CS, Ip M, Cheung WH, Wong RMY. Hydrogel Delivery of DNase I and Liposomal Vancomycin to Eradicate Fracture-related Methicillin-resistant Staphylococcus aureus Infection and Support Osteoporotic Fracture Healing. Acta Biomater 2023; 164:223-239. [PMID: 37019168 DOI: 10.1016/j.actbio.2023.03.044] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 03/24/2023] [Accepted: 03/29/2023] [Indexed: 04/07/2023]
Abstract
Fracture-related infection (FRI) is a devastating complication in orthopedic surgery. A recent study showed that FRI causes more severe infection and further delays healing in osteoporotic bone. Moreover, bacterial biofilm formed on implants cannot be eradicated by systemic antibiotics, warranting novel treatments. Here, we developed a DNase I and Vancomycin hydrogel delivery vehicle to eradicate Methicillin-resistant Staphylococcus aureus (MRSA) infection in vivo. Vancomycin was encapsulated in liposomes, and DNase I and Vancomycin/liposomal-Vancomycin was loaded on thermosensitive hydrogel. In vitro drug release test showed a burst release of DNase I (77.2%) within 72 hours and sustained release of Vancomycin (82.6%) up to day 14. The in vivo efficacy was evaluated in a clinically relevant ovariectomy (OVX) induced osteoporotic metaphyseal fracture model with MRSA infection, and a total of 120 Sprague Dawley rats were used. In the OVX with infection group, biofilm development caused a drastic inflammatory response, trabecular bone destruction, and non-union. In the DNase I and Vancomycin co-delivery hydrogel group (OVX-Inf-DVG), bacteria on bone and implant were eradicated. X-ray and micro-CT showed preservation of trabecular bone and bone union. HE staining showed the absence of inflammatory necrosis, and fracture healing was restored. The local elevation of TNF-α and IL-6 and increased number of osteoclasts were prevented in the OVX-Inf-DVG group. Our findings suggest that dual release of DNase I and Vancomycin initially followed by Vancomycin only later up to 14 days effectively eliminates MRSA infection, prevents biofilm development and provides a sterile environment to promote fracture healing in osteoporotic bone with FRI. STATEMENT OF SIGNIFICANCE: The biofilm formation on the implant is difficult to eradicate, causing recurrent infection and non-union in fracture-related infection (FRI). Here we developed a hydrogel therapy with high in vivo efficacy to eliminate MRSA biofilm infection in a clinically-relevant FRI model in osteoporotic bone. By loading DNase I and vancomycin/liposomal-vancomycin on thermosensitive poly-(DL-lactic acidco-glycolic acid) (PLGA)-polyethylene glycol (PEG)-PLGA hydrogel, a dual release of DNase I and Vancomycin was achieved whilst preserving enzyme activity. In this model, the progressive development of infection caused a drastic inflammatory response, osteoclastogenesis, trabecular bone destruction, and non-union of fracture. These pathological changes were successfully prevented by the dual delivery of DNase I and vancomycin. Our findings provide a promising strategy for FRI in osteoporotic bone.
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Affiliation(s)
- Jie Li
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | | | - Yik Lok Chung
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Simon Kwoon Ho Chow
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Volker Alt
- Department of Trauma Surgery, University Hospital Regensburg, Germany
| | - Markus Rupp
- Department of Trauma Surgery, University Hospital Regensburg, Germany
| | | | - Chun Sing Chui
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Margaret Ip
- Department of Microbiology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Wing-Hoi Cheung
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Ronald Man Yeung Wong
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong SAR, China.
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14
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Alrouji M, Kuriri FA, Alqasmi MH, AlSudais H, Alissa M, Alsuwat MA, Asad M, Joseph B, Almuhanna Y. A Simple In-Vivo Method for Evaluation of Antibiofilm and Wound Healing Activity Using Excision Wound Model in Diabetic Swiss Albino Mice. Microorganisms 2023; 11:microorganisms11030692. [PMID: 36985266 PMCID: PMC10051147 DOI: 10.3390/microorganisms11030692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 02/27/2023] [Accepted: 03/07/2023] [Indexed: 03/30/2023] Open
Abstract
The study developed a simple and inexpensive method to induce biofilm formation in-vivo for the evaluation of the antibiofilm activity of pharmacological agents using Swiss albino mice. Animals were made diabetic using streptozocin and nicotinamide. A cover slip containing preformed biofilm along with MRSA culture was introduced into the excision wound in these animals. The method was effective in developing biofilm on the coverslip after 24 h incubation in MRSA broth which was confirmed by microscopic examination and a crystal violet assay. Application of preformed biofilm along with microbial culture induced a profound infection with biofilm formation on excision wounds in 72 h. This was confirmed by macroscopic, histological, and bacterial load determination. Mupirocin, a known antibacterial agent effective against MRSA was used to demonstrate antibiofilm activity. Mupirocin was able to completely heal the excised wounds in 19 to 21 days while in the base-treated group, healing took place between 30 and 35 days. The method described is robust and can be reproduced easily without the use of transgenic animals and sophisticated methods such as confocal microscopy.
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Affiliation(s)
- Mohammed Alrouji
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Shaqra University, Shaqra 11961, Saudi Arabia
| | - Fahd A Kuriri
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Shaqra University, Shaqra 11961, Saudi Arabia
| | - Mohammed Hussein Alqasmi
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Shaqra University, Shaqra 11961, Saudi Arabia
| | - Hamood AlSudais
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, Riyadh 12372, Saudi Arabia
| | - Mohammed Alissa
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
| | - Meshari A Alsuwat
- Clinical Laboratory Sciences Department, College of Applied Medical Sciences, Taif University, Al-Taif 21974, Saudi Arabia
| | - Mohammed Asad
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Shaqra University, Shaqra 11961, Saudi Arabia
| | - Babu Joseph
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Shaqra University, Shaqra 11961, Saudi Arabia
| | - Yasir Almuhanna
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Shaqra University, Shaqra 11961, Saudi Arabia
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15
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Comparison of the Level of Staphylococcus Aureus and Escherichia Coli in Complete Cleft Infants With Normal Infants. J Craniofac Surg 2023; 34:e268-e271. [PMID: 36872471 DOI: 10.1097/scs.0000000000009202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 10/18/2022] [Indexed: 03/07/2023] Open
Abstract
BACKGROUND There are many types of oral bacteria, and they differ between healthy children and children with an oral cleft. The purpose of this study was to compare the level of Staphylococcus aureus and Escherichia coli in complete cleft infants with normal infants. MATERIALS AND METHODS Fifty-two Iraqi infants had participated in this study (26 infants were with cleft and 26 infants were the control healthy group), the study group included 13 infants with class III Veau's palatal classification, and 13 with class IV Veau's palatal classification). All are aged from 1 day to 4 months. They were selected and submitted to a questionnaire and clinical examination and bacterial examination. Data description, analysis and presentation were performed using statistical package for social science (SPSS version 21). RESULTS The counting and colonization of S. aureus and GV- (E. coli) were higher in cleft group than in control group.
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16
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Zhi Ling RL, Kong LK, Lim LH, Teo SS, Ng HS, Lan JCW, Khoo KS. Identification of microorganisms from fermented biowaste and the potential for wastewater treatment. ENVIRONMENTAL RESEARCH 2023; 218:115013. [PMID: 36495970 DOI: 10.1016/j.envres.2022.115013] [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: 09/22/2022] [Revised: 11/24/2022] [Accepted: 12/06/2022] [Indexed: 06/17/2023]
Abstract
Food loss or waste is a far-reaching problem and has indeed become a worrying issue that is growing at an alarming rate. Fruits and vegetables are lost or wasted at the highest rate among the composition of food waste. Furthermore, the world is progressing toward sustainable development; hence, an efficient approach to valorise fruit and vegetable waste (FVW) is necessary. A simple phenotypic characterisation of microbiota isolated from the fermented FVW was conducted, and its effectiveness toward wastewater treatment was investigated. Presumptive identification suggested that yeast is dominant in this study, accounting for 85% of total isolates. At the genus level, the enriched medium's microbial community consists of Saccharomyces, Bacillus and Candida. Ammonium in the wastewater can enhance certain bacteria to grow, such as lactic acid bacteria, resulting in decreased NH4+ concentration at the end of the treatment to 0.5 mg/L. In addition, the fermented biowaste could reduce PO43- by 90% after the duration of treatment. Overall, FVW is a valuable microbial resource, and the microbial population enables a reduction in organic matter such as NH4+ and PO43-. This study helps explore the function and improve the effectiveness of utilising biowaste by understanding the microorganisms responsible for producing eco-enzyme.
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Affiliation(s)
- Regina Leong Zhi Ling
- Faculty of Applied Sciences, UCSI University, UCSI Heights, 56000 Cheras, Kuala Lumpur, Malaysia
| | - Lai Kuan Kong
- Faculty of Applied Sciences, UCSI University, UCSI Heights, 56000 Cheras, Kuala Lumpur, Malaysia
| | - Lai Huat Lim
- Faculty of Applied Sciences, UCSI University, UCSI Heights, 56000 Cheras, Kuala Lumpur, Malaysia
| | - Swee Sen Teo
- Faculty of Applied Sciences, UCSI University, UCSI Heights, 56000 Cheras, Kuala Lumpur, Malaysia
| | - Hui-Suan Ng
- Centre for Research and Graduate Studies, University of Cyberjaya, Persiaran Bestari, 63000 Cyberjaya, Selangor, Malaysia.
| | - John Chi-Wei Lan
- Biorefinery and Bioprocess Engineering Laboratory, Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan, Taiwan; Graduate School of Biotechnology and Bioengineering, Yuan Ze University, Taoyuan, Taiwan
| | - Kuan Shiong Khoo
- Centre for Research and Graduate Studies, University of Cyberjaya, Persiaran Bestari, 63000 Cyberjaya, Selangor, Malaysia; Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan, Taiwan.
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Zhao Q, Gong Z, Wang J, Fu L, Zhang J, Wang C, Miron RJ, Yuan Q, Zhang Y. A Zinc- and Calcium-Rich Lysosomal Nanoreactor Rescues Monocyte/Macrophage Dysfunction under Sepsis. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2205097. [PMID: 36596693 PMCID: PMC9951326 DOI: 10.1002/advs.202205097] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 12/05/2022] [Indexed: 05/31/2023]
Abstract
Sepsis is a dysregulation of the immune response to pathogens and has high morbidity and mortality worldwide. However, the unclear mapping and course of dysregulated immune cells currently hinders the development of advanced therapeutic strategies to treat sepsis. Here, evidence is provided using single-cell RNA sequencing from peripheral blood mononuclear cells in sepsis that pathogens attacking monocytes/macrophages disrupt their immune function. The results reveal an enormous decline in monocytes/macrophages in sepsis and chart the evolution of their impaired phagocytosis (Pha) capabilities. Inspired by these findings, nanoparticles, named "Alpha-MOFs," are developed that target dysfunctional monocytes/macrophages to actively (A) lift (L) Pha by the release of lysosome-sensitive ions from a mineralized metal-organic framework (MOF). Alpha-MOFs have good stability and biosafety in peripheral blood and efficiently targeted monocytes/macrophages. They also release calcium and zinc ions into monocyte/macrophage lysosomes to promote the Pha and degradation of bacteria. Taken together, these results suggest that Alpha-MOFs rescue monocytes/macrophages dysfunction and effectively improve their survival rate during sepsis.
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Affiliation(s)
- Qin Zhao
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei‐MOST) & Key Laboratory of Oral BiomedicineMinistry of EducationSchool & Hospital of StomatologyWuhan UniversityWuhan430079P. R. China
- Medical Research InstituteSchool of MedicineWuhan UniversityWuhan430071P. R. China
| | - Zijian Gong
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei‐MOST) & Key Laboratory of Oral BiomedicineMinistry of EducationSchool & Hospital of StomatologyWuhan UniversityWuhan430079P. R. China
- Medical Research InstituteSchool of MedicineWuhan UniversityWuhan430071P. R. China
| | - Jiaolong Wang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei‐MOST) & Key Laboratory of Oral BiomedicineMinistry of EducationSchool & Hospital of StomatologyWuhan UniversityWuhan430079P. R. China
- Medical Research InstituteSchool of MedicineWuhan UniversityWuhan430071P. R. China
| | - Liangliang Fu
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei‐MOST) & Key Laboratory of Oral BiomedicineMinistry of EducationSchool & Hospital of StomatologyWuhan UniversityWuhan430079P. R. China
- Medical Research InstituteSchool of MedicineWuhan UniversityWuhan430071P. R. China
| | - Jing Zhang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei‐MOST) & Key Laboratory of Oral BiomedicineMinistry of EducationSchool & Hospital of StomatologyWuhan UniversityWuhan430079P. R. China
- Medical Research InstituteSchool of MedicineWuhan UniversityWuhan430071P. R. China
| | - Can Wang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei‐MOST) & Key Laboratory of Oral BiomedicineMinistry of EducationSchool & Hospital of StomatologyWuhan UniversityWuhan430079P. R. China
- Medical Research InstituteSchool of MedicineWuhan UniversityWuhan430071P. R. China
| | - Richard J. Miron
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei‐MOST) & Key Laboratory of Oral BiomedicineMinistry of EducationSchool & Hospital of StomatologyWuhan UniversityWuhan430079P. R. China
- Medical Research InstituteSchool of MedicineWuhan UniversityWuhan430071P. R. China
| | - Quan Yuan
- Institute of Chemical Biology and NanomedicineState Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha410082P. R. China
| | - Yufeng Zhang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei‐MOST) & Key Laboratory of Oral BiomedicineMinistry of EducationSchool & Hospital of StomatologyWuhan UniversityWuhan430079P. R. China
- Medical Research InstituteSchool of MedicineWuhan UniversityWuhan430071P. R. China
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18
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Kanagasingam S, von Ruhland C, Welbury R, Singhrao SK. Ex vivo Detection of Amyloid-β in Naturally Formed Oral Biofilm. J Alzheimers Dis Rep 2022; 6:757-773. [PMID: 36721488 PMCID: PMC9837734 DOI: 10.3233/adr-220076] [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: 09/21/2022] [Accepted: 11/18/2022] [Indexed: 12/12/2022] Open
Abstract
Background Oral infection has been implicated in the possible etiology of Alzheimer's disease. Objective To detect amyloid-β (Aβ) within microbial biofilms. Methods Freshly extracted teeth (N = 87) with periodontal disease were separated into Group A (N = 11), with primary root canal infection and Group B (N = 21) with failed endodontic treatment identified by the presence of, gutta percha root filling. Biofilm characteristics were observed by scanning electron microscopy (SEM). Demineralized paraffin wax embedded tooth sections and mineralized calculus biofilm were immunostained with the anti-Aβ antibody. The gutta perchas were processed either for on-section acrylic resin tissue immunocolloidal gold silver staining (IGSS) using the anti-Aβ antibody or in Araldite resin for ultrastructure. Results SEM demonstrated calculus and gutta percha in situ harboring a polymicrobial biofilm featuring extracellular polymeric substance (EPS) and water channels. Immunohistochemistry on rehydrated paraffin wax tooth sections from Group A, demonstrated Aβ staining on external (calculus and plaque) and all intracanal infected regions. In Group B, the gutta percha biofilm IGSS gave an inconclusive result for Aβ. Transmission electron microscopy of selected teeth with infected intra-canals (Group A) and 20% of gutta percha biofilm (Group B) EPS contained electron dense fibrils of variable sizes, some of which were typical of human Aβ fibrils. Conclusion This study detected both soluble and insoluble Aβ fibrils within the EPS of periodontal and endodontic natural biofilm, strongly suggesting its role as an antimicrobial peptide in combatting local infection, with potential risk for cross-seeding into the brain for AD development.
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Affiliation(s)
- Shalini Kanagasingam
- Brain and Behavior Centre, Faculty of Clinical and Biomedical Sciences, School of Dentistry, University of Central Lancashire, Preston, UK
| | - Christopher von Ruhland
- Electron and Light Microscopy Facility, College of Biomedical and Life Sciences, Cardiff University, Wales, UK
| | - Richard Welbury
- Brain and Behavior Centre, Faculty of Clinical and Biomedical Sciences, School of Dentistry, University of Central Lancashire, Preston, UK
| | - Sim K. Singhrao
- Brain and Behavior Centre, Faculty of Clinical and Biomedical Sciences, School of Dentistry, University of Central Lancashire, Preston, UK,Correspondence to: Sim K. Singhrao, University of Central Lancashire, Preston, PR1 2HE, UK. E-mail:
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Khairullah AR, Sudjarwo SA, Effendi MH, Ramandinianto SC, Gelolodo MA, Widodo A, Riwu KHP, Kurniawati DA. Review of pork and pork products as a source for transmission of methicillin-resistant Staphylococcus aureus. INTERNATIONAL JOURNAL OF ONE HEALTH 2022. [DOI: 10.14202/ijoh.2022.167-177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) is an opportunistic bacterium that can cause infection in animals and humans. Recently, MRSA from food-producing or farm animals has been identified as livestock-associated MRSA (LA-MRSA). The spread of LA-MRSA is particularly found in pork and pork products because LA-MRSA has been widely known to infect pigs. The most common type of LA-MRSA identified in pork and pork products is the clonal complex LA-MRSA 398 (LA-MRSA CC398). The MRSA strains on the surface of pork carcasses can be spread during the handling and processing of pork and pork products through human hands, cutting tools, and any surface that comes into direct contact with pork. Food infection is the main risk of MRSA in pork and pork products consumed by humans. Antibiotics to treat food infection cases due to MRSA infection include vancomycin and tigecycline. The spread of MRSA in pork and pork products is preventable by appropriately cooking and cooling the pork and pork products at temperatures above 60°C and below 5°C, respectively. It is also necessary to take other preventive measures, such as having a clean meat processing area and disinfecting the equipment used for processing pork and pork products. This review aimed to explain epidemiology, transmission, risk factors, diagnosis, public health consequences, treatment of food poisoning, and preventing the spread of MRSA in pork and pork products.
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Affiliation(s)
- Aswin Rafif Khairullah
- Doctoral Program in Veterinary Science, Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Sri Agus Sudjarwo
- Department of Veterinary Pharmacology, Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Mustofa Helmi Effendi
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Sancaka Cashyer Ramandinianto
- Master Program in Veterinary Disease and Public Health, Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| | - Maria Aega Gelolodo
- Department of Animal Infectious Diseases and Veterinary Public Health, Faculty of Medicine and Veterinary Medicine, Universitas Nusa Cendana, Kupang, Indonesia
| | - Agus Widodo
- Doctoral Program in Veterinary Science, Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
| | | | - Dyah Ayu Kurniawati
- Master Program in Veterinary Disease and Public Health, Faculty of Veterinary Medicine, Universitas Airlangga, Surabaya, Indonesia
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Greeson EM, Madsen CS, Makela AV, Contag CH. Magnetothermal Control of Temperature-Sensitive Repressors in Superparamagnetic Iron Nanoparticle-Coated Bacillus subtilis. ACS NANO 2022; 16:16699-16712. [PMID: 36200984 DOI: 10.1021/acsnano.2c06239] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Superparamagnetic iron oxide nanoparticles (SPIONs) are used as contrast agents in magnetic resonance imaging (MRI) and magnetic particle imaging (MPI), and resulting images can be used to guide magnetothermal heating. Alternating magnetic fields (AMF) cause local temperature increases in regions with SPIONs, and we investigated the ability of magnetic hyperthermia to regulate temperature-sensitive repressors (TSRs) of bacterial transcription. The TSR, TlpA39, was derived from a Gram-negative bacterium and used here for thermal control of reporter gene expression in Gram-positive, Bacillus subtilis. In vitro heating of B. subtilis with TlpA39 controlling bacterial luciferase expression resulted in a 14.6-fold (12 hours; h) and 1.8-fold (1 h) increase in reporter transcripts with a 10.0-fold (12 h) and 12.1-fold (1 h) increase in bioluminescence. To develop magnetothermal control, B. subtilis cells were coated with three SPION variations. Electron microscopy coupled with energy dispersive X-ray spectroscopy revealed an external association with, and retention of, SPIONs on B. subtilis. Furthermore, using long duration AMF we demonstrated magnetothermal induction of the TSRs in SPION-coated B. subtilis with a maximum of 5.6-fold increases in bioluminescence. After intramuscular injections of SPION-coated B. subtilis, histology revealed that SPIONs remained in the same locations as the bacteria. For in vivo studies, 1 h of AMF is the maximum exposure due to anesthesia constraints. Both in vitro and in vivo, there was no change in bioluminescence after 1 h of AMF treatment. Pairing TSRs with magnetothermal energy using SPIONs for localized heating with AMF can lead to transcriptional control that expands options for targeted bacteriotherapies.
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Affiliation(s)
- Emily M Greeson
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan 48824, United States
- Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States
| | - Cody S Madsen
- Department of Biomedical Engineering, Michigan State University, East Lansing, Michigan 48824, United States
- Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States
| | - Ashley V Makela
- Department of Biomedical Engineering, Michigan State University, East Lansing, Michigan 48824, United States
- Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States
| | - Christopher H Contag
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan 48824, United States
- Department of Biomedical Engineering, Michigan State University, East Lansing, Michigan 48824, United States
- Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States
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21
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Ou T, Gao H, Jiang K, Yu J, Zhao R, Liu X, Zhou Z, Xiang Z, Xie J. Endophytic Klebsiella aerogenes HGG15 stimulates mulberry growth in hydro-fluctuation belt and the potential mechanisms as revealed by microbiome and metabolomics. Front Microbiol 2022; 13:978550. [PMID: 36033884 PMCID: PMC9417544 DOI: 10.3389/fmicb.2022.978550] [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: 06/26/2022] [Accepted: 07/29/2022] [Indexed: 11/24/2022] Open
Abstract
Growth promotion and stress tolerance induced by endophytes have been observed in various plants, but their effects on mulberry regularly suffering flood in the hydro-fluctuation belt are less understood. In the present study, endophytic Klebsiella aerogenes HGG15 was screened out from 28 plant growth promotion (PGP) bacteria as having superior PGP traits in vitro and in planta as well as biosafety for silkworms. K. aerogenes HGG15 could actively colonize into roots of mulberry and subsequently transferred to stems and leaves. The 16S ribosomal RNA (V3–V4 variable regions) amplicon sequencing revealed that exogenous application of K. aerogenes HGG15 altered the bacterial community structures of mulberry roots and stems. Moreover, the genus of Klebsiella was particularly enriched in inoculated mulberry roots and was positively correlated with mulberry development and soil potassium content. Untargeted metabolic profiles uncovered 201 differentially abundant metabolites (DEMs) between inoculated and control mulberry, with lipids and organo-heterocyclic compounds being particularly abundant DEMs. In addition, a high abundance of abiotic stress response factors and promotion growth stimulators such as glycerolipid, sphingolipid, indole, pyridine, and coumarin were observed in inoculated mulberry. Collectively, the knowledge gained from this study sheds light on potential strategies to enhance mulberry growth in hydro-fluctuation belt, and microbiome and metabolite analyses provide new insights into the growth promotion mechanisms used by plant-associated bacteria.
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Affiliation(s)
- Ting Ou
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Haiying Gao
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Kun Jiang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Jing Yu
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Ruolin Zhao
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Xiaojiao Liu
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Zeyang Zhou
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
- College of Life Science, Chongqing Normal University, Chongqing, China
| | - Zhonghuai Xiang
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
| | - Jie Xie
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, China
- *Correspondence: Jie Xie,
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22
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Kinetic Characterization of the Immune Response to Methicillin-Resistant Staphylococcus aureus Subcutaneous Skin Infection. Infect Immun 2022; 90:e0006522. [PMID: 35647662 DOI: 10.1128/iai.00065-22] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Staphylococcus aureus is a leading cause of skin and soft tissue infections (SSTIs). Studies examining the immune response to S. aureus have been conducted, yet our understanding of the kinetic response to S. aureus subcutaneous skin infection remains incomplete. In this study, we used C57BL/6J mice and USA300 S. aureus to examine the host-pathogen interface from 8 h postinfection to 15 days postinfection (dpi), with the following outcomes measured: lesion size, bacterial titers, local cytokine and chemokine levels, phenotype of the responding leukocytes, and histopathology and Gram staining of skin tissue. Lesions were largest at 1 dpi, with peak necrotic tissue areas at 3 dpi, and were largely resolved by 15 dpi. During early infection, bacterial titers were high, neutrophils were the most abundant immune cell type, there was a decrease in most leukocyte populations found in uninfected skin, and many different cytokines were produced. Histopathological analysis demonstrated swift and extensive keratinocyte death and robust and persistent neutrophil infiltration. Gram staining revealed subdermal S. aureus colonization and, later, limited migration into upper skin layers. Interleukin-17A/F (IL-17A/F) was detected only starting at 5 dpi and coincided with an immediate decrease in bacterial numbers in the following days. After 9 days, neutrophils were no longer the most abundant immune cell type present as most other leukocyte subsets returned, and surface wounds resolved coincident with declining bacterial titers. Collectively, these data illustrate a dynamic immune response to S. aureus skin infection and suggest a key role for precisely timed IL-17 production for infection clearance and healthy tissue formation.
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23
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Pan F, Giovannini G, Zhang S, Altenried S, Zuber F, Chen Q, Boesel LF, Ren Q. pH-responsive silica nanoparticles for the treatment of skin wound infections. Acta Biomater 2022; 145:172-184. [PMID: 35417797 DOI: 10.1016/j.actbio.2022.04.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 03/15/2022] [Accepted: 04/06/2022] [Indexed: 12/20/2022]
Abstract
Chronic wounds are not only a burden for patients but also challenging for clinic treatment due to biofilm formation. Here, we utilized the phenomenon that chronic wounds possess an elevated local pH of 8.9 and developed pH-sensitive silica nanoparticles (SiNPs) to achieve a targeted drug release on alkaline wounds and optimized drug utility. Chlorhexidine (CHX), a disinfectant and antiseptic, was loaded into SiNPs as the model drug. The loaded CHX displayed a release 4 - 5 fold higher at pH 8.0 and 8.5 than at pH 6.5, 7.0 and 7.4. CHX-SiNPs furthermore exhibited a distinctive antibacterial activity at pH 8.0 and 8.5 against both Gram-negative and -positive bacterial pathogens, while no cytotoxicity was found according to cell viability analysis. The CHX-SiNPs were further formulated into alginate hydrogels to allow ease of use. The antibacterial efficacy of CHX-SiNPs was then studied with artificial wounds on ex vivo human skin. Treatment with CHX-SiNPs enabled nearly a 4-lg reduction of the viable bacterial cells, and the alginate formulated CHX-SiNPs led to almost a 3-lg reduction compared to the negative controls. The obtained results demonstrated that CHX-SiNPs are capable of efficient pH-triggered drug release, leading to high antibacterial efficacy. Moreover, CHX-SiNPs enlighten clinic potential towards the treatment of chronic wound infections. STATEMENT OF SIGNIFICANCE: A platform for controlled drug release at a relatively high pH value i.e., over 8, was established by tuning the physical structures of silica nanoparticles (SiNPs). Incorporation of chlorhexidine, an antimicrobial agent, into the fabricated SiNPs allowed a distinctive inhibition of bacterial growth at alkaline pHs, but not at acidic pHs. The efficacy of the SiNPs loaded with chlorhexidine in treating wound infections was further validated by utilizing ex vivo human skin samples. The presented work demonstrates clinic potential of employing alkaline pH as a non-invasive stimulus to achieve on-demand delivery of antimicrobials through SiNPs, showcasing a valuable approach to treating bacterial infections on chronic wounds.
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24
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Arqué X, Torres MDT, Patiño T, Boaro A, Sánchez S, de la Fuente-Nunez C. Autonomous Treatment of Bacterial Infections in Vivo Using Antimicrobial Micro- and Nanomotors. ACS NANO 2022; 16:7547-7558. [PMID: 35486889 PMCID: PMC9134509 DOI: 10.1021/acsnano.1c11013] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The increasing resistance of bacteria to existing antibiotics constitutes a major public health threat globally. Most current antibiotic treatments are hindered by poor delivery to the infection site, leading to undesired off-target effects and drug resistance development and spread. Here, we describe micro- and nanomotors that effectively and autonomously deliver antibiotic payloads to the target area. The active motion and antimicrobial activity of the silica-based robots are driven by catalysis of the enzyme urease and antimicrobial peptides, respectively. These antimicrobial motors show micromolar bactericidal activity in vitro against different Gram-positive and Gram-negative pathogenic bacterial strains and act by rapidly depolarizing their membrane. Finally, they demonstrated autonomous anti-infective efficacy in vivo in a clinically relevant abscess infection mouse model. In summary, our motors combine navigation, catalytic conversion, and bactericidal capacity to deliver antimicrobial payloads to specific infection sites. This technology represents a much-needed tool to direct therapeutics to their target to help combat drug-resistant infections.
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Affiliation(s)
- Xavier Arqué
- Institute
for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), Barcelona 08028, Spain
| | - Marcelo D. T. Torres
- Machine
Biology Group, Departments of Psychiatry and Microbiology, Institute
for Biomedical Informatics, Institute for Translational Medicine and
Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Departments
of Bioengineering and Chemical and Biomolecular Engineering, School
of Engineering and Applied Science, University
of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Penn
Institute for Computational Science, University
of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Tania Patiño
- Institute
for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), Barcelona 08028, Spain
- Chemistry
Department, University of Rome, Tor Vergata, Rome 00133, Italy
| | - Andreia Boaro
- Machine
Biology Group, Departments of Psychiatry and Microbiology, Institute
for Biomedical Informatics, Institute for Translational Medicine and
Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Departments
of Bioengineering and Chemical and Biomolecular Engineering, School
of Engineering and Applied Science, University
of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Penn
Institute for Computational Science, University
of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Samuel Sánchez
- Institute
for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), Barcelona 08028, Spain
- Institució
Catalana de Recerca i Estudis Avançats (ICREA), Barcelona 08010, Spain
| | - Cesar de la Fuente-Nunez
- Machine
Biology Group, Departments of Psychiatry and Microbiology, Institute
for Biomedical Informatics, Institute for Translational Medicine and
Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Departments
of Bioengineering and Chemical and Biomolecular Engineering, School
of Engineering and Applied Science, University
of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Penn
Institute for Computational Science, University
of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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25
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An Assessment of the Lactic Acid-Producing Potential of Bacterial Strains Isolated from Food Waste. MICROBIOLOGY RESEARCH 2022. [DOI: 10.3390/microbiolres13020022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Lactic acid (LA) is widely used in many industries as a crucial starting material in food products, bio-based materials, and biodegradable polymers. The goals of this research were to isolate LA bacteria from food wastes, assess their potential for LA production, and study their growth characteristics. In this study, six bacterial strains were isolated from food waste and identified using 16S rRNA gene sequencing; namely, Weissella viridescens WJ39, Leuconostoc lactis YS33, Leuconostoc citreum KD42, Leuconostoc mesenteroides VN60, Macrococcus caseolyticus FCI29, and Weissella confusa RG41. W. viridescens WJ39 showed the highest potential for lactic acid production (17.56 g L−1day−1), and the lowest potential was found in L. lactis YS33 (14.09 g L−1day−1). There were significant differences (p < 0.05) in the LA production rates among Weissella spp., Leuconostoc spp., and Macrococcus spp. Moreover, dramatic differences in growth rate were observed among the six strains. W. viridescens WJ39 exhibited the highest growth rate (0.80 h−1), while M. caseolyticus FCI29 exhibited the lowest growth rate (0.57 h−1). W. viridescens WJ39 also exhibited lactic acid production (at a rate around 2 g L−1day−1) in a lab incubation experiment with food waste as a nutrient source. The draft genome of W. viridescens WJ39 with 16 contigs was constructed with an N50 of 215217 bp. The genome size was approximately 1.54 Mb, with a GC content of 41%. A hicD gene, known to catalyze the conversion of pyruvate to D-lactate, was discovered in the genome. This study illustrated the potential for the production of lactic acid from food waste with lactic acid bacteria.
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26
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Elbehiry A, Marzouk E, Aldubaib M, Moussa I, Abalkhail A, Ibrahem M, Hamada M, Sindi W, Alzaben F, Almuzaini AM, Algammal AM, Rawway M. Pseudomonas species prevalence, protein analysis, and antibiotic resistance: an evolving public health challenge. AMB Express 2022; 12:53. [PMID: 35532863 PMCID: PMC9086069 DOI: 10.1186/s13568-022-01390-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 04/24/2022] [Indexed: 11/22/2022] Open
Abstract
Psychrotrophic Pseudomonas is one of the significant microbes that lead to putrefaction in chilled meat. One of the biggest problems in the detection of Pseudomonas is that several species are seemingly identical. Currently, antibiotic resistance is one of the most significant challenges facing the world's health and food security. Therefore, this study was designed to apply an accurate technique for eliminating the identification discrepancy of Pseudomonas species and to study their resistance against various antimicrobials. A total of 320 chicken meat specimens were cultivated, and the isolated bacteria’ were phenotypically recognized. Protein analysis was carried out for cultured isolates via Microflex LT. The resistance of Pseudomonas isolates was recorded through Vitek® 2 AST-GN83 cards. Overall, 69 samples were identified as Pseudomonas spp. and included 18 Pseudomonas lundensis (P. lundensis), 16 Pseudomonas fragi (P. fragi), 13 Pseudomonas oryzihabitans (P. oryzihabitans), 10 Pseudomonas stutzeri (P. stutzeri), 5 Pseudomonas fluorescens (P. fluorescens), 4 Pseudomonas putida (P. putida), and 3 Pseudomonas aeruginosa (P. aeruginosa) isolates. Microflex LT identified all Pseudomonas isolates (100%) correctly with a score value ≥ 2.00. PCA positively discriminated the identified isolates into various groups. The antimicrobial resistance levels against Pseudomonas isolates were 81.16% for nitrofurantoin, 71% for ampicillin and ampicillin/sulbactam, 65.22% for cefuroxime and ceftriaxone, 55% for aztreonam, and 49.28% for ciprofloxacin. The susceptibilities were 100% for cefotaxime, 98.55% for ceftazidime, 94.20% for each piperacillin/tazobactam and cefepime, 91.3% for cefazolin. In conclusion, chicken meat was found to be contaminated with different Pseudomonas spp., with high incidence rates of P. lundensis. Microflex LT is a potent tool for distinguishing Pseudomonads at the species level.
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27
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Kim D, Kim KY. Pectolinarin Inhibits the Bacterial Biofilm Formation and Thereby Reduces Bacterial Pathogenicity. Antibiotics (Basel) 2022; 11:antibiotics11050598. [PMID: 35625242 PMCID: PMC9137516 DOI: 10.3390/antibiotics11050598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 04/26/2022] [Accepted: 04/27/2022] [Indexed: 12/10/2022] Open
Abstract
Bacterial biofilms are a growing problem as it is a major cause of nosocomial infection from urinary catheters to chronic tissue infections and provide resistance to a variety of antibiotics and the host’s immune system. The effect of pectolinarin on the biofilm formation in Enterococcus faecalis, Enterococcus faecium, Escherichia coli, Streptococcus mutans, Streptococcus sobrinus, Staphylococcus aureus, Pseudomonas aeruginosa, Cutibacterium acnes, and Porphyromonas gingivalis was studied in TSBg (tryptic soy broth supplemented with 1% glucose). Pectolinarin inhibited biofilm formation of E. faecalis (IC50 = 0.39 μg/mL), E. faecium (IC50 = 0.19 μg/mL), E. coli (IC50 = 0.25 μg/mL), S. mutans (IC50 = 1.2 μg/mL), S. sobrinus (IC50 = 1.4 μg/mL), S. aureus (IC50 = 0.39 μg/mL), P. aeruginosa (IC50 = 0.9 μg/mL), P. acnes (IC50 = 12.5 μg/mL), and P. gingivalis (IC50 = 9.0 μg/mL) without inhibiting the bacterial growth. Pectolinarin also showed increased susceptibility of antibacterial activity with commercially available antibiotics including ampicillin, vancomycin, streptomycin, and oxytetracyclin against E. faecalis and E. faecium. Finally, pectolinarin dose-dependently reduced the expression of genes including cytolysin genes (cylLS, cylR2 and cylM), quorum sensing (QS) genes (fsrB, fsrC, gelE, ebpA, ebpB, acm, scm and bps), and biofilm virulence genes (esp) of E. faecalis and E. faecium. Pectolinarin reduced the bacterial biofilm formation, activated the antibacterial susceptibility, and reduced the bacterial adherence. These results suggest that bacterial biofilm formation is a good target to develop the antibacterial agents against biofilm-related infections.
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Affiliation(s)
- Daseul Kim
- Graduate School of Biotechnology, Kyung Hee University, Seocheon, Giheung, Yongin 17104, Korea;
| | - Ki-Young Kim
- Graduate School of Biotechnology, Kyung Hee University, Seocheon, Giheung, Yongin 17104, Korea;
- College of Life Science, Kyung Hee University, Seocheon, Giheung, Yongin 17104, Korea
- Correspondence: ; Tel.: +82-312012633
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28
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Tuncer G, Aktas Z, Basaran S, Cagatay A, Eraksoy H. Biofilm formation of panresistant Klebsiella pneumoniae. Future Microbiol 2022; 17:723-735. [PMID: 35443798 DOI: 10.2217/fmb-2021-0108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Introduction: The authors aimed to investigate the biofilm-forming features of panresistant Klebsiella pneumoniae (PRKp). Material & methods: The biofilm formations were shown under light microscope and laser scanning confocal microscopy. The optical densities of the wells were measured and classified according to biofilm-forming capacities. Results: The ratio of biofilm-forming K. pneumoniae was established to be 100%. All isolates were found to form high-level biofilms in classification compared with positive and negative controls. No significant difference was detected in the biofilm-forming capacities of K. pneumoniae strains isolated from different sample types. Conclusion: No previous study associated with PRKp isolates was identified in the literature search. There is a need for different approaches characterizing the biofilm-forming features of PRKp.
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Affiliation(s)
- Gulsah Tuncer
- Department of Infectious Diseases & Clinical Microbiology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, 34104, Turkey
| | - Zerrin Aktas
- Department of Microbiology & Clinical Microbiology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, 34104, Turkey
| | - Seniha Basaran
- Department of Infectious Diseases & Clinical Microbiology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, 34104, Turkey
| | - Atahan Cagatay
- Department of Infectious Diseases & Clinical Microbiology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, 34104, Turkey
| | - Haluk Eraksoy
- Department of Infectious Diseases & Clinical Microbiology, Istanbul Faculty of Medicine, Istanbul University, Istanbul, 34104, Turkey
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29
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Olmos-Ortiz A, Hernández-Pérez M, Flores-Espinosa P, Sedano G, Helguera-Repetto AC, Villavicencio-Carrisoza Ó, Valdespino-Vazquez MY, Flores-Pliego A, Irles C, Rivas-Santiago B, Moreno-Verduzco ER, Díaz L, Zaga-Clavellina V. Compartmentalized Innate Immune Response of Human Fetal Membranes against Escherichia coli Choriodecidual Infection. Int J Mol Sci 2022; 23:ijms23062994. [PMID: 35328414 PMCID: PMC8949057 DOI: 10.3390/ijms23062994] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/21/2022] [Accepted: 03/02/2022] [Indexed: 12/29/2022] Open
Abstract
An infectious process into the uterine cavity represents a major endangered condition that compromises the immune privilege of the maternal-fetal unit and increases the risk for preterm birth (PTB) and premature rupture of membranes (PROM). Fetal membranes are active secretors of antimicrobial peptides (AMP), which limit bacterial growth, such as Escherichia coli. Nevertheless, the antibacterial responses displayed by chorioamniotic membranes against a choriodecidual E. coli infection have been briefly studied. The objective of this research was to characterize the profile of synthesis, activity, and spatial distribution of a broad panel of AMPs produced by fetal membranes in response to E. coli choriodecidual infection. Term human chorioamniotic membranes were mounted in a two independent compartment model in which the choriodecidual region was infected with live E. coli (1 × 105 CFU/mL). Amnion and choriodecidual AMP tissue levels and TNF-α and IL-1β secretion were measured by the enzyme-linked immunosorbent assay. The passage of bacterium through fetal membranes and their effect on structural continuity was followed for 24 h. Our results showed that E. coli infection caused a progressive mechanical disruption of the chorioamniotic membranes and an activated inflammatory environment. After the challenge, the amnion quickly (2-4 h) induced production of human beta defensins (HBD)-1, HBD-2, and LL-37. Afterwards (8-24 h), the amnion significantly produced HBD-1, HBD-2, HNP-1-3, S100A7, sPLA2, and elafin, whereas the choriodecidua induced LL-37 synthesis. Therefore, we noticed a temporal- and tissue-specific pattern regulation of the synthesis of AMPs by infected fetal membranes. However, fetal membranes were not able to contain the collagen degradation or the bacterial growth and migration despite the battery of produced AMPs, which deeply increases the risk for PTB and PROM. The mixture of recombinant HBDs at low concentrations resulted in increased bactericidal activity compared to each HBD alone in vitro, encouraging further research to study AMP combinations that may offer synergy to control drug-resistant infections in the perinatal period.
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Affiliation(s)
- Andrea Olmos-Ortiz
- Departamento de Inmunobioquímica, Instituto Nacional de Perinatología (INPer), Mexico City 11000, Mexico; (A.O.-O.); (M.H.-P.); (P.F.-E.); (G.S.); (A.C.H.-R.); (Ó.V.-C.); (A.F.-P.)
| | - Mayra Hernández-Pérez
- Departamento de Inmunobioquímica, Instituto Nacional de Perinatología (INPer), Mexico City 11000, Mexico; (A.O.-O.); (M.H.-P.); (P.F.-E.); (G.S.); (A.C.H.-R.); (Ó.V.-C.); (A.F.-P.)
| | - Pilar Flores-Espinosa
- Departamento de Inmunobioquímica, Instituto Nacional de Perinatología (INPer), Mexico City 11000, Mexico; (A.O.-O.); (M.H.-P.); (P.F.-E.); (G.S.); (A.C.H.-R.); (Ó.V.-C.); (A.F.-P.)
| | - Gabriela Sedano
- Departamento de Inmunobioquímica, Instituto Nacional de Perinatología (INPer), Mexico City 11000, Mexico; (A.O.-O.); (M.H.-P.); (P.F.-E.); (G.S.); (A.C.H.-R.); (Ó.V.-C.); (A.F.-P.)
| | - Addy Cecilia Helguera-Repetto
- Departamento de Inmunobioquímica, Instituto Nacional de Perinatología (INPer), Mexico City 11000, Mexico; (A.O.-O.); (M.H.-P.); (P.F.-E.); (G.S.); (A.C.H.-R.); (Ó.V.-C.); (A.F.-P.)
| | - Óscar Villavicencio-Carrisoza
- Departamento de Inmunobioquímica, Instituto Nacional de Perinatología (INPer), Mexico City 11000, Mexico; (A.O.-O.); (M.H.-P.); (P.F.-E.); (G.S.); (A.C.H.-R.); (Ó.V.-C.); (A.F.-P.)
| | | | - Arturo Flores-Pliego
- Departamento de Inmunobioquímica, Instituto Nacional de Perinatología (INPer), Mexico City 11000, Mexico; (A.O.-O.); (M.H.-P.); (P.F.-E.); (G.S.); (A.C.H.-R.); (Ó.V.-C.); (A.F.-P.)
| | - Claudine Irles
- Departamento de Fisiología y Desarrollo Celular, INPer, Mexico City 11000, Mexico;
| | | | | | - Lorenza Díaz
- Departamento de Biología de la Reproducción, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City 14080, Mexico;
| | - Verónica Zaga-Clavellina
- Departamento de Fisiología y Desarrollo Celular, INPer, Mexico City 11000, Mexico;
- Correspondence: ; Tel.: +52-55-5520-9900 (ext. 478)
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30
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Cesaro A, Torres MDT, Gaglione R, Dell'Olmo E, Di Girolamo R, Bosso A, Pizzo E, Haagsman HP, Veldhuizen EJA, de la Fuente-Nunez C, Arciello A. Synthetic Antibiotic Derived from Sequences Encrypted in a Protein from Human Plasma. ACS NANO 2022; 16:1880-1895. [PMID: 35112568 DOI: 10.1021/acsnano.1c04496] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Encrypted peptides have been recently found in the human proteome and represent a potential class of antibiotics. Here we report three peptides derived from the human apolipoprotein B (residues 887-922) that exhibited potent antimicrobial activity against drug-resistant Klebsiella pneumoniae, Acinetobacter baumannii, and Staphylococci both in vitro and in an animal model. The peptides had excellent cytotoxicity profiles, targeted bacteria by depolarizing and permeabilizing their cytoplasmic membrane, inhibited biofilms, and displayed anti-inflammatory properties. Importantly, the peptides, when used in combination, potentiated the activity of conventional antibiotics against bacteria and did not select for bacterial resistance. To ensure translatability of these molecules, a protease resistant retro-inverso variant of the lead encrypted peptide was synthesized and demonstrated anti-infective activity in a preclinical mouse model. Our results provide a link between human plasma and innate immunity and point to the blood as a source of much-needed antimicrobials.
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Affiliation(s)
- Angela Cesaro
- Department of Chemical Sciences, University of Naples Federico II, Naples I-80126, Italy
- Department of Biomolecular Health Sciences, Division of Infectious Diseases and Immunology, Section Molecular Host Defence, Faculty of Veterinary Medicine, Utrecht University, Utrecht 3584 CL, The Netherlands
- Machine Biology Group, Departments of Psychiatry and Microbiology, Institute for Biomedical Informatics, Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Departments of Bioengineering and Chemical and Biomolecular Engineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Penn Institute for Computational Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Marcelo D T Torres
- Machine Biology Group, Departments of Psychiatry and Microbiology, Institute for Biomedical Informatics, Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Departments of Bioengineering and Chemical and Biomolecular Engineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Penn Institute for Computational Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Rosa Gaglione
- Department of Chemical Sciences, University of Naples Federico II, Naples I-80126, Italy
- Istituto Nazionale di Biostrutture e Biosistemi (INBB), Rome 00136, Italy
| | - Eliana Dell'Olmo
- Department of Chemical Sciences, University of Naples Federico II, Naples I-80126, Italy
| | - Rocco Di Girolamo
- Department of Chemical Sciences, University of Naples Federico II, Naples I-80126, Italy
| | - Andrea Bosso
- Department of Biology, University of Naples Federico II, Naples I-80126, Italy
| | - Elio Pizzo
- Department of Biology, University of Naples Federico II, Naples I-80126, Italy
| | - Henk P Haagsman
- Department of Biomolecular Health Sciences, Division of Infectious Diseases and Immunology, Section Molecular Host Defence, Faculty of Veterinary Medicine, Utrecht University, Utrecht 3584 CL, The Netherlands
| | - Edwin J A Veldhuizen
- Department of Biomolecular Health Sciences, Division of Infectious Diseases and Immunology, Section Immunology, Faculty of Veterinary Medicine, Utrecht University, Utrecht 3584 CL, The Netherlands
| | - Cesar de la Fuente-Nunez
- Machine Biology Group, Departments of Psychiatry and Microbiology, Institute for Biomedical Informatics, Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Departments of Bioengineering and Chemical and Biomolecular Engineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Penn Institute for Computational Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Angela Arciello
- Department of Chemical Sciences, University of Naples Federico II, Naples I-80126, Italy
- Istituto Nazionale di Biostrutture e Biosistemi (INBB), Rome 00136, Italy
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Li J, Wong RMY, Chung YL, Leung SSY, Chow SKH, Ip M, Cheung WH. Fracture-related infection in osteoporotic bone causes more severe infection and further delays healing. Bone Joint Res 2022; 11:49-60. [PMID: 35100815 PMCID: PMC8882324 DOI: 10.1302/2046-3758.112.bjr-2021-0299.r1] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Aims With the ageing population, fragility fractures have become one of the most common conditions. The objective of this study was to investigate whether microbiological outcomes and fracture-healing in osteoporotic bone is worse than normal bone with fracture-related infection (FRI). Methods A total of 120 six-month-old Sprague-Dawley (SD) rats were randomized to six groups: Sham, sham + infection (Sham-Inf), sham with infection + antibiotics (Sham-Inf-A), ovariectomized (OVX), OVX + infection (OVX-Inf), and OVX + infection + antibiotics (OVX-Inf-A). Open femoral diaphysis fractures with Kirschner wire fixation were performed. Staphylococcus aureus at 4 × 104 colony-forming units (CFU)/ml was inoculated. Rats were euthanized at four and eight weeks post-surgery. Radiography, micro-CT, haematoxylin-eosin, mechanical testing, immunohistochemistry (IHC), gram staining, agar plating, crystal violet staining, and scanning electron microscopy were performed. Results Agar plating analysis revealed a higher bacterial load in bone (p = 0.002), and gram staining showed higher cortical bone colonization (p = 0.039) in OVX-Inf compared to Sham-Inf. OVX-Inf showed significantly increased callus area (p = 0.013), but decreased high-density bone volume (p = 0.023) compared to Sham-Inf. IHC staining showed a significantly increased expression of TNF-α in OVX-Inf compared to OVX (p = 0.049). Significantly reduced bacterial load on bone (p = 0.001), enhanced ultimate load (p = 0.001), and energy to failure were observed in Sham-Inf-A compared to Sham-Inf (p = 0.028), but not in OVX-Inf-A compared to OVX-Inf. Conclusion In osteoporotic bone with FRI, infection was more severe with more bone lysis and higher bacterial load, and fracture-healing was further delayed. Systemic antibiotics significantly reduced bacterial load and enhanced callus quality and strength in normal bone with FRI, but not in osteoporotic bone. Cite this article: Bone Joint Res 2022;11(2):49–60.
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Affiliation(s)
- Jie Li
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong, China
| | - Ronald Man Yeung Wong
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong, China
| | - Yik Lok Chung
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong, China
| | | | - Simon Kwoon-Ho Chow
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong, China
| | - Margaret Ip
- Department of Microbiology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, China
| | - Wing-Hoi Cheung
- Department of Orthopaedics & Traumatology, The Chinese University of Hong Kong, Hong Kong, China
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32
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Ma Y, Liu H, Xia X, Ning M, Ji B, Li Y, Li H, Du J, Sun W, Gu W, Meng Q. Toxicity of avermectin to Eriocheir sinensis and the isolation of a avermectin-degrading bacterium, Ochrobactrum sp. AVM-2. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 230:113115. [PMID: 34953271 DOI: 10.1016/j.ecoenv.2021.113115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 12/13/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
Avermectin is widely used in the prevention and treatment of parasites diseases in aquaculture. However, the residual avermectin has a serious impact on the growth and quality of aquatic animals including Eriocheir sinensis. This study shows that the LC50 of avermectin to E. sinensis for 24, 48, 72 and 96 h was 21.88, 13.40, 9.11 and 7.10 mg/L, respectively. After avermectin stress, the activities of superoxide dismutase (SOD), catalase (CAT) and phenol oxidase (PO) in the hepatopancreas of E. sinensis increased and reached the peak on the 6th day. The content of malondialdehyde (MDA) accumulated with the increase of exposure time and concentration of avermectin. After 15 days of avermectin exposure, hepatopancreas was damaged seriously. These results indicated that avermectin had toxicity to E. sinensis. In order to solve the pollution problem caused by residual avermectin, a degrading bacterium AVM-2 was separated from the sediment of E. sinensis breeding pond. The strain was confirmed to be Ochrobactrum sp by morphology observation, physiological and biochemical identification and 16 S rDNA sequences analysis. When the pH value was 7, the temperature was 30 ℃, the concentration of substrate was low, the quantity of inoculation was high, Ochrobactrum sp. AVM-2 had better degradation effect on avermectin. When the addition of Ochrobactrum sp. AVM-2 was 2.34 × 108 CFU/L, the residual avermectin in muscle and hepatopancreatine significantly decreased, and the degradation rate was about 66%. In summary, Ochrobactrum sp. AVM-2 could be used to solve the residual problem of avermectin and ensure the food safety of E. sinensis.
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Affiliation(s)
- Yubo Ma
- Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Marine Science and Engineering & College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Hongli Liu
- Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Marine Science and Engineering & College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Xiaoli Xia
- Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Marine Science and Engineering & College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Mingxiao Ning
- Institution of Quality Standard and Testing Technology for Agro-product, Shandong Academy of Agricultural Science, Jinan, Shandong 250100, China
| | - Bairu Ji
- Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Marine Science and Engineering & College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Yingrui Li
- Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Marine Science and Engineering & College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Haolan Li
- Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Marine Science and Engineering & College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Jie Du
- Animal Husbandry and Veterinary College, Jiangsu Vocational College of Agriculture and Forestry, Jurong, Jiangsu 212400, China
| | - Wei Sun
- Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, Jiangsu 210009, China.
| | - Wei Gu
- Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Marine Science and Engineering & College of Life Sciences, Nanjing Normal University, Nanjing 210023, China.
| | - Qingguo Meng
- Jiangsu Key Laboratory for Aquatic Crustacean Diseases, College of Marine Science and Engineering & College of Life Sciences, Nanjing Normal University, Nanjing 210023, China; Institution of Quality Standard and Testing Technology for Agro-product, Shandong Academy of Agricultural Science, Jinan, Shandong 250100, China; Animal Husbandry and Veterinary College, Jiangsu Vocational College of Agriculture and Forestry, Jurong, Jiangsu 212400, China.
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Sarker RR, Tsunoi Y, Haruyama Y, Sato S, Nishidate I. Depth distributions of bacteria for the Pseudomonas aeruginosa-infected burn wounds treated by methylene blue-mediated photodynamic therapy in rats: effects of additives to photosensitizer. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:JBO-210330GR. [PMID: 35088588 PMCID: PMC8794038 DOI: 10.1117/1.jbo.27.1.018001] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 12/27/2021] [Indexed: 05/31/2023]
Abstract
SIGNIFICANCE Pseudomonas(P.) aeruginosa, a common cause of infection in burns, acquires antibiotic resistance easily and forms biofilms efficiently. Thus, it is difficult to control P. aeruginosa infection in burn wounds, which causes lethal septicemia. Antimicrobial photodynamic therapy (aPDT) is attractive as a new strategy to treat burn wound infections with drug-resistant bacteria. AIM We examined the efficacy of methylene blue (MB)-mediated aPDT with various additives in a tissue depth-resolved manner to find conditions that minimize the bacterial invasion. APPROACH We applied MB-mediated aPDT with LED array illumination to an extensive, full-thickness burn infected with P. aeruginosa in rats for three consecutive days (days 0, 1, and 2). On day 2, the depth distributions of bacteria were assessed based on the histological analysis using Gram staining. We examined how the addition of ethylenediaminetetraacetic acid (EDTA), ethanol, and dimethyl sulfoxide (DMSO) affected the efficacy of aPDT. RESULTS Pure MB-mediated aPDT significantly reduced the numbers of bacteria with biofilms on the wound surface and in the epidermis compared with those for the control tissue (saline only). However, there were many bacteria in the deeper region of the tissue. In contrast, MB/EDTA/ethanol/DMSO-mediated aPDT minimized the numbers of bacteria in the broad depth region of the tissue. Still, a limited number of bacteria was observed in the subcutaneous tissue. CONCLUSIONS The depthwise analysis of bacteria demonstrated the efficacy of the MB-mediated aPDT with the addition of EDTA, ethanol, and DMSO in controlling burn wound infections. However, further improvement of the therapy is needed to suppress bacterial migration into the deep tissue completely.
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Affiliation(s)
- Roma R. Sarker
- Tokyo University of Agriculture and Technology, Graduate School of Bio-Applications and Systems Engineering, Koganei, Japan
- Bangladesh Agricultural University, Department of Medicine, Faculty of Veterinary Science, Mymensingh, Bangladesh
| | - Yasuyuki Tsunoi
- National Defense Medical College Research Institute, Division of Bioinformation and Therapeutic Systems, Tokorozawa, Japan
| | - Yasue Haruyama
- National Defense Medical College Research Institute, Division of Bioinformation and Therapeutic Systems, Tokorozawa, Japan
| | - Shunichi Sato
- National Defense Medical College Research Institute, Division of Bioinformation and Therapeutic Systems, Tokorozawa, Japan
| | - Izumi Nishidate
- Tokyo University of Agriculture and Technology, Graduate School of Bio-Applications and Systems Engineering, Koganei, Japan
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34
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Mohamed Salleh NAB, Tanaka Y, Sutarlie L, Su X. Detecting bacterial infections in wounds: a review of biosensors and wearable sensors in comparison with conventional laboratory methods. Analyst 2022; 147:1756-1776. [DOI: 10.1039/d2an00157h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Review on laboratory-based methods and biosensors and wearable sensors for detecting wound infection by aerobic and anaerobic bacteria.
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Affiliation(s)
- Nur Asinah binte Mohamed Salleh
- Institute of Materials Research and Engineering, A* Star (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore 138634
| | - Yuki Tanaka
- Institute of Materials Research and Engineering, A* Star (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore 138634
| | - Laura Sutarlie
- Institute of Materials Research and Engineering, A* Star (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore 138634
| | - Xiaodi Su
- Institute of Materials Research and Engineering, A* Star (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, Singapore 138634
- Department of Chemistry, National University of Singapore, Block S8, Level 3, 3 Science Drive 3, Singapore 117543
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35
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Center SA, Randolph JF, Warner KL, McDonough SP, Lucy JM, Sapa KC. Bacterial culture and immunohistochemical detection of bacteria and endotoxin in cats with suppurative cholangitis-cholangiohepatitis syndrome. J Am Vet Med Assoc 2021; 260:194-211. [PMID: 34936576 DOI: 10.2460/javma.20.10.0552] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To characterize the frequency and type of bacterial infection by culture- and immunohistochemical (IHC)-based methods and determine the impact of infection on clinical features and survival time in cats with suppurative cholangitis-cholangiohepatitis syndrome (S-CCHS). ANIMALS 168 client-owned cats with S-CCHS (cases). PROCEDURES Clinical features, bacterial culture results, culture-inoculate sources, and survival details were recorded. Cases were subcategorized by comorbidity (extrahepatic bile duct obstruction, cholelithiasis, cholecystitis, ductal plate malformation, biopsy-confirmed inflammatory bowel disease, and biopsy-confirmed pancreatitis) or treatment by cholecystectomy or cholecystoenterostomy. Culture results, bacterial isolates, Gram-stain characteristics, and IHC staining were compared among comorbidities. Lipoteichoic acid IHC staining detected gram-positive bacterial cell wall components, and toll-like receptor expression IHC reflected pathologic endotoxin (gram-negative bacteria) exposure. RESULTS Clinical features were similar among cases except for more frequent abdominal pain and lethargy in cats with positive culture results and pyrexia, abdominal pain, and hepatomegaly for cats with polymicrobial infections. Bacteria were cultured in 93 of 135 (69%) cats, with common isolates including Enterococcus spp and Escherichia coli. IHC staining was positive in 142 of 151 (94%) cats (lipoteichoic acid, 107/142 [75%]; toll-like receptor 4, 99/142 [70%]). With in-parallel interpretation of culture and IHC-based bacterial detection, 154 of 166 (93%) cats had bacterial infections (gram-positive, 118/154 [77%]; gram-negative, 111/154 [72%]; polymicrobial, 79/154 [51%]). Greater frequency of bacterial isolation occurred with combined tissue, bile, and crushed cholelith inoculates. Infection and gram-positive bacterial isolates were associated with significantly shorter long-term survival times. CLINICAL RELEVANCE S-CCHS was associated with bacterial infection, pathologic endotoxin exposure, and frequent polymicrobial infection in cats. Combined tissue inoculates improved culture detection of associated bacteria.
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Affiliation(s)
- Sharon A Center
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY
| | - John F Randolph
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY
| | - Karen L Warner
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY
| | - Sean P McDonough
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY
| | | | - Kirk C Sapa
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY
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36
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Chen JW, Hsu CC, Su CC, Hsu RB, Chiu YL, Chia JS, Jung CJ. Transient bacteremia promotes catheter-related central venous thrombosis through neutrophil extracellular traps. Thromb Haemost 2021; 122:1198-1208. [PMID: 34768303 DOI: 10.1055/a-1695-8612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Formation of intravenous catheter-related thrombosis leads to central venous stenosis in patients requiring renal replacement therapy or chemotherapy infusion, yet the triggering or mechanisms remain unclear, especially in patients without symptoms of infection. In this study, we found that neutrophil extracellular traps (NETs) could be detected in the fibrin sheaths from dialysis patients without clinical manifestations of infection. Confocal microscopy revealed bacteria imbedded in NETs in the fibrin sheaths. Thirty-nine of 50 (78%) fibrin sheath specimens contained bacteria detectable by 16S ribosomal RNA genome typing with a predominance of Staphylococcus aureus (69%). In rat models, transient bacteremia of S. aureus induced NETs in enlarged fibrin sheaths, and treatment with DNase I alone significantly reduced both NET and fibrin sheath formation surrounding the catheter. Therefore, transient bacteremia could be a silent trigger that induces NET-related immunothrombosis enhancing catheter-related central venous stenosis.
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Affiliation(s)
- Jeng-Wei Chen
- National Taiwan University Hospital, Department of Surgery, National Taiwan University College of Medicine, Taipei, Taiwan.,Graduate institute of clinical medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Chih-Chieh Hsu
- School of Dentistry, Graduate Institute of Oral Biology, National Taiwan University, Taipei, Taiwan
| | - Chien-Chia Su
- National Taiwan University Hospital, Department of ophthalmology, National Taiwan University College of Medicine, Taipei, Taiwan.,Graduate institute of clinical medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Ron-Bin Hsu
- National Taiwan University Hospital, Department of Surgery, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Yen-Ling Chiu
- Graduate institute of clinical medicine, National Taiwan University College of Medicine, Taipei, Taiwan.,Department of Medicine, Division of Nephrology, Far Eastern Memorial Hospital, New Taipei City, Taiwan.,College of Informatics, Department of Computer Science and Engineering, Graduate Program in Biomedical Informatics, Yuan Ze University, Chung-Li, Taiwan
| | - Jean-San Chia
- Graduate institute of clinical medicine, National Taiwan University College of Medicine, Taipei, Taiwan.,Graduate Institute of Microbiology, National Taiwan University College of Medicine, Taipei, Taiwan.,School of Dentistry, Graduate Institute of Clinical Dentistry, National Taiwan University, Taipei, Taiwan
| | - Chiau-Jing Jung
- College of Medicine, School of Medicine, Department of Microbiology and Immunology, Taipei Medical University, Taipei, Taiwan
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37
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Melter O, Abdulla L, Harwill M, Vaniš V, Pavlíková M, Tkadlec J. SensiGram as a modified Gram staining procedure with higher sensitivity for detection of Gram-negative bacteria in blood culture. J Microbiol Methods 2021; 191:106344. [PMID: 34653524 DOI: 10.1016/j.mimet.2021.106344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 09/22/2021] [Accepted: 09/26/2021] [Indexed: 10/20/2022]
Affiliation(s)
- O Melter
- Department of Medical Microbiology, 2nd Faculty of Medicine, Charles University, V Úvalu 84, 15006 Prague 5, Czech Republic.
| | - L Abdulla
- Department of Medical Microbiology, 2nd Faculty of Medicine, Charles University, V Úvalu 84, 15006 Prague 5, Czech Republic
| | - M Harwill
- Department of Medical Microbiology, 2nd Faculty of Medicine, Charles University, V Úvalu 84, 15006 Prague 5, Czech Republic
| | - V Vaniš
- Department of Medical Microbiology, 2nd Faculty of Medicine, Charles University, V Úvalu 84, 15006 Prague 5, Czech Republic
| | - M Pavlíková
- Department of Probability and Mathematical Statistics, Charles University-Faculty of Mathematics and Physics, Prague, Czech Republic
| | - J Tkadlec
- Department of Medical Microbiology, 2nd Faculty of Medicine, Charles University, V Úvalu 84, 15006 Prague 5, Czech Republic
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38
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Yin C, Wang Z, Ding X, Chen X, Wang J, Yang E, Wang W, Martin LL, Sun D. Crystalline ruthenium polypyridine nanoparticles: a targeted treatment of bacterial infection with multifunctional antibacterial, adhesion and surface-anchoring photosensitizer properties. J Mater Chem B 2021; 9:3808-3825. [PMID: 33979422 DOI: 10.1039/d1tb00103e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photodynamic antibacterial therapy employs nanocomposites as an alternative to traditional antibiotics for the treatment of bacterial infections. However, many of these antibacterial materials are less effective towards bacteria than traditional drugs, either due to poor specificity or antibacterial activity. This can result in needless and excessive drug use in treatments. This paper describes a multifunctional drug delivery nanoparticle (MDD-NP), Sph-Ru-MMT@PZ, based on the nanostructured-form of [Ru(bpy)2dppz] (PF6)2 (Sph-Ru), which has adhesive properties towards its microbial targets as well as surface-anchoring photosensitizer effects. The design and construction of MDD-NP is based on the adhesive properties of the outer layers of montmorillonite (MMT), which allows Sph-Ru-MMT@PZ to successfully reach its bacterial target; the outer layer of the E. coli. In addition, under 670 nm red irradiation therapy (R-IT), the surface-anchoring properties use the photosensitizer phthalocyanine zinc (PZ) to destroy the bacteria by producing reactive oxygen species (ROS) which causes cell lysis of E. coli. More importantly, Sph-Ru-MMT@PZ has no fluorescence response to live E. coli with intact cell membranes but selectively stained and demonstrated fluorescence during membrane damage of early-stage cells as well as exposure of nuclear materials at late-stage of cell lysis. Sph-Ru-MMT@PZ showed beneficial and synergistic anti-infective effects in vivo by inhibiting the E. coli infection-induced inflammatory response and eventually promoting wound healing in mice. This new strategy for high precision antibacterial therapy towards specific targets, provides an exciting opportunity for the application of multifunctional nanocomposites towards microbial infections.
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Affiliation(s)
- Chenyang Yin
- School of Life Sciences, Anhui Agricultural University, Hefei, 230036, China.
| | - Zekun Wang
- School of Life Sciences, Anhui Agricultural University, Hefei, 230036, China.
| | - Xiaoyuan Ding
- School of Life Sciences, Anhui Agricultural University, Hefei, 230036, China.
| | - Xiaoqing Chen
- School of Life Sciences, Anhui Agricultural University, Hefei, 230036, China.
| | - Jingyuan Wang
- School of Life Sciences, Anhui Agricultural University, Hefei, 230036, China.
| | - Endong Yang
- School of Life Sciences, Anhui Agricultural University, Hefei, 230036, China.
| | - Weiyun Wang
- School of Life Sciences, Anhui Agricultural University, Hefei, 230036, China.
| | - Lisandra L Martin
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia.
| | - Dongdong Sun
- School of Life Sciences, Anhui Agricultural University, Hefei, 230036, China.
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Kwiecinski JM, Kratofil RM, Parlet CP, Surewaard BGJ, Kubes P, Horswill AR. Staphylococcus aureus uses the ArlRS and MgrA cascade to regulate immune evasion during skin infection. Cell Rep 2021; 36:109462. [PMID: 34320352 PMCID: PMC8450000 DOI: 10.1016/j.celrep.2021.109462] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 05/01/2021] [Accepted: 07/09/2021] [Indexed: 01/20/2023] Open
Abstract
Skin is one of the most common sites of host immune response against Staphylococcus aureus infection. Here, through a combination of in vitro assays, mouse models, and intravital imaging, we find that S. aureus immune evasion in skin is controlled by a cascade composed of the ArlRS two-component regulatory system and its downstream effector, MgrA. S. aureus lacking either ArlRS or MgrA is less virulent and unable to form correct abscess structure due to de-repression of a giant surface protein, Ebh. These S. aureus mutants also have decreased expression of immune evasion factors (leukocidins, chemotaxis-inhibitory protein of S. aureus [CHIPS], staphylococcal complement inhibitor [SCIN], and nuclease) and are unable to kill neutrophils, block their chemotaxis, degrade neutrophil extracellular traps, and survive direct neutrophil attack. The combination of disrupted abscess structure and reduced immune evasion factors makes S. aureus susceptible to host defenses. ArlRS and MgrA are therefore the main regulators of S. aureus immune evasion and promising treatment targets.
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Affiliation(s)
- Jakub M Kwiecinski
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO 80045, USA; Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow 30387, Poland
| | - Rachel M Kratofil
- Department of Physiology and Pharmacology, University of Calgary, Calgary, AB T2N 4Z6, Canada; Calvin, Phoebe, and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB T2N 4Z6, Canada
| | - Corey P Parlet
- Department of Veterans Affairs, Iowa City VA Medical Center, Iowa City, IA 52246, USA; Department of Microbiology and Immunology, University of Iowa, Iowa City, IA 52242, USA
| | - Bas G J Surewaard
- Department of Physiology and Pharmacology, University of Calgary, Calgary, AB T2N 4Z6, Canada; Calvin, Phoebe, and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB T2N 4Z6, Canada
| | - Paul Kubes
- Department of Physiology and Pharmacology, University of Calgary, Calgary, AB T2N 4Z6, Canada; Calvin, Phoebe, and Joan Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB T2N 4Z6, Canada
| | - Alexander R Horswill
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO 80045, USA; Department of Veterans Affairs, Eastern Colorado Health Care System, Aurora, CO 80045, USA.
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40
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Shojaei E, Walsh JC, Sangle N, Yan B, Silverman MS, Hosseini-Moghaddam SM. Gastrointestinal Histoplasmosis Mimicking Crohn's Disease. Open Forum Infect Dis 2021; 8:ofab249. [PMID: 34262987 PMCID: PMC8274358 DOI: 10.1093/ofid/ofab249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 05/13/2021] [Indexed: 11/13/2022] Open
Abstract
Disseminated histoplasmosis is a life-threatening disease usually seen in immunocompromised patients living in endemic areas. We present an apparently immunocompetent patient with gastrointestinal histoplasmosis who was initially diagnosed with biopsy-proven Crohn's disease. Following discontinuation of anti-inflammatory drugs and institution of antifungal therapy, his gastrointestinal illness completely improved. Specific fungal staining should be routinely included in histopathologic assessment of tissue specimens diagnosed as Crohn's disease.
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Affiliation(s)
- Esfandiar Shojaei
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Joanna C Walsh
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Nikhil Sangle
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Brian Yan
- Division of Gastroenterology, Department of Medicine, Schulich School of Medicine & Dentistry, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Michael S Silverman
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
- Department of Epidemiology and Biostatistics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Seyed M Hosseini-Moghaddam
- Division of Infectious Diseases, Department of Medicine, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
- Division of Infectious Diseases, Department of Medicine, University Health Network, University of Toronto, Toronto, Ontario, Canada
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Zhao X, Chen L, Ren Q, Wu Z, Fang S, Jiang Y, Chen Y, Zhong Y, Wang D, Wu J, Zhang G. Potential Applications in Sewage Bioremediation of the Highly Efficient Pyridine-Transforming Paenochrobactrum sp. APPL BIOCHEM MICRO+ 2021. [DOI: 10.1134/s0003683821030145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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42
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He F, Wu X, Zhang Q, Li Y, Ye Y, Li P, Chen S, Peng Y, Hardeland R, Xia Y. Bacteriostatic Potential of Melatonin: Therapeutic Standing and Mechanistic Insights. Front Immunol 2021; 12:683879. [PMID: 34135911 PMCID: PMC8201398 DOI: 10.3389/fimmu.2021.683879] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 05/13/2021] [Indexed: 12/30/2022] Open
Abstract
Diseases caused by pathogenic bacteria in animals (e.g., bacterial pneumonia, meningitis and sepsis) and plants (e.g., bacterial wilt, angular spot and canker) lead to high prevalence and mortality, and decomposition of plant leaves, respectively. Melatonin, an endogenous molecule, is highly pleiotropic, and accumulating evidence supports the notion that melatonin's actions in bacterial infection deserve particular attention. Here, we summarize the antibacterial effects of melatonin in vitro, in animals as well as plants, and discuss the potential mechanisms. Melatonin exerts antibacterial activities not only on classic gram-negative and -positive bacteria, but also on members of other bacterial groups, such as Mycobacterium tuberculosis. Protective actions against bacterial infections can occur at different levels. Direct actions of melatonin may occur only at very high concentrations, which is at the borderline of practical applicability. However, various indirect functions comprise activation of hosts' defense mechanisms or, in sepsis, attenuation of bacterially induced inflammation. In plants, its antibacterial functions involve the mitogen-activated protein kinase (MAPK) pathway; in animals, protection by melatonin against bacterially induced damage is associated with inhibition or activation of various signaling pathways, including key regulators such as NF-κB, STAT-1, Nrf2, NLRP3 inflammasome, MAPK and TLR-2/4. Moreover, melatonin can reduce formation of reactive oxygen and nitrogen species (ROS, RNS), promote detoxification and protect mitochondrial damage. Altogether, we propose that melatonin could be an effective approach against various pathogenic bacterial infections.
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Affiliation(s)
- Fang He
- College of Veterinary Medicine, Southwest University, Chongqing, China.,Guangdong Laboratory of Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Animal Nutrition Control, Institute of Subtropical Animal Nutrition and Feed, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Xiaoyan Wu
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Animal Nutrition Control, Institute of Subtropical Animal Nutrition and Feed, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Qingzhuo Zhang
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Animal Nutrition Control, Institute of Subtropical Animal Nutrition and Feed, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Yikun Li
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Animal Nutrition Control, Institute of Subtropical Animal Nutrition and Feed, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Yuyi Ye
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Animal Nutrition Control, Institute of Subtropical Animal Nutrition and Feed, College of Animal Science, South China Agricultural University, Guangzhou, China
| | - Pan Li
- College of Veterinary Medicine, Southwest University, Chongqing, China
| | - Shuai Chen
- Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, China
| | - Yuanyi Peng
- College of Veterinary Medicine, Southwest University, Chongqing, China
| | - Rüdiger Hardeland
- Johann Friedrich Blumenbach Institute of Zoology and Anthropology, University of Göttingen, Göttingen, Germany
| | - Yaoyao Xia
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Animal Nutrition Control, Institute of Subtropical Animal Nutrition and Feed, College of Animal Science, South China Agricultural University, Guangzhou, China
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Sabio L, González A, Ramírez-Rodríguez GB, Gutiérrez-Fernández J, Bañuelo O, Olivares M, Gálvez N, Delgado-López JM, Dominguez-Vera JM. Probiotic cellulose: Antibiotic-free biomaterials with enhanced antibacterial activity. Acta Biomater 2021; 124:244-253. [PMID: 33524562 DOI: 10.1016/j.actbio.2021.01.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 01/25/2021] [Accepted: 01/26/2021] [Indexed: 02/07/2023]
Abstract
The alarming increase of antibiotic-resistant bacteria, causing conventional treatments of bacterial infections to become increasingly inefficient, is one of the biggest threats to global health. Here, we have developed probiotic cellulose, an antibiotic-free biomaterial for the treatment of severe skin infections and chronic wounds. This composite biomaterial was in-depth characterized by Gram stain, scanning electron microscopy (SEM) and confocal fluorescence microscopy. Results demonstrated that probiotic cellulose consists of dense films of cellulose nanofibers, free of cellulose-producing bacteria, completely invaded by live probiotics (Lactobacillus fermentum or Lactobacillus gasseri). Viability assays, including time evolution of pH and reducing capacity against electrochromic polyoxometalate, confirmed that probiotics within the cellulose matrix are not only alive but also metabolically active, a key point for the use of probiotic cellulose as an antibiotic-free antibacterial biomaterial. Antibacterial assays in pathogen-favorable media, a real-life infection scenario, demonstrated that probiotic cellulose strongly reduces the viability of Staphylococcus aureus (SA) and Pseudomonas aeruginosa (PA), the most active pathogens in severe skin infections and chronic wounds. Likewise, probiotic cellulose was also found to be effective to inhibit the proliferation of methicillin-resistant SA (MRSA). The combination of the properties of bacterial cellulose as wound dressing biomaterial and the antibacterial activity of probiotics makes probiotic cellulose an alternative to antibiotics for the treatment of topical infections, including severe and hard-to-heal chronic wounds. In addition, probiotic cellulose was obtained by a one-pot synthetic approach under mild conditions, not requiring the long and expensive chemical treatments to purify the genuine bacterial cellulose.
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Affiliation(s)
- Laura Sabio
- Departamento de Química Inorgánica, Universidad de Granada, 18071 Granada, Spain
| | - Ana González
- Departamento de Química Inorgánica, Universidad de Granada, 18071 Granada, Spain
| | | | | | - Oscar Bañuelo
- Biosearch S. A. Camino de Purchil, 66, 18004 Granada, Spain
| | | | - Natividad Gálvez
- Departamento de Química Inorgánica, Universidad de Granada, 18071 Granada, Spain
| | - José M Delgado-López
- Departamento de Química Inorgánica, Universidad de Granada, 18071 Granada, Spain.
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Yagi H, Kihara S, Mittwede PN, Maher PL, Rothenberg AC, Falcione ADCM, Chen A, Urish KL, Tuan RS, Alexander PG. Development of a large animal rabbit model for chronic periprosthetic joint infection. Bone Joint Res 2021; 10:156-165. [PMID: 33641351 PMCID: PMC8005337 DOI: 10.1302/2046-3758.103.bjr-2019-0193.r3] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Aims Periprosthetic joint infections (PJIs) and osteomyelitis are clinical challenges that are difficult to eradicate. Well-characterized large animal models necessary for testing and validating new treatment strategies for these conditions are lacking. The purpose of this study was to develop a rabbit model of chronic PJI in the distal femur. Methods Fresh suspensions of Staphylococcus aureus (ATCC 25923) were prepared in phosphate-buffered saline (PBS) (1 × 109 colony-forming units (CFUs)/ml). Periprosthetic osteomyelitis in female New Zealand white rabbits was induced by intraosseous injection of planktonic bacterial suspension into a predrilled bone tunnel prior to implant screw placement, examined at five and 28 days (n = 5/group) after surgery, and compared to a control aseptic screw group. Radiographs were obtained weekly, and blood was collected to measure ESR, CRP, and white blood cell (WBC) counts. Bone samples and implanted screws were harvested on day 28, and processed for histological analysis and viability assay of bacteria, respectively. Results Intraosseous periprosthetic introduction of planktonic bacteria induced an acute rise in ESR and CRP that subsided by day 14, and resulted in radiologically evident periprosthetic osteolysis by day 28 accompanied by elevated WBC counts and histological evidence of bacteria in the bone tunnels after screw removal. The aseptic screw group induced no increase in ESR, and no lysis developed around the implants. Bacterial viability was confirmed by implant sonication fluid culture. Conclusion Intraosseous periprosthetic introduction of planktonic bacteria reliably induces survivable chronic PJI in rabbits. Cite this article: Bone Joint Res 2021;10(3):156–165.
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Affiliation(s)
- Haruyo Yagi
- Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Shinsuke Kihara
- Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Peter N Mittwede
- Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Patrick L Maher
- Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Adam C Rothenberg
- Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Alyssa D C M Falcione
- Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Antonia Chen
- Department of Orthopaedic Surgery, Center for Cellular and Molecular Engineering, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Department of Orthopaedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Kenneth L Urish
- Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA.,Arthritis and Arthroplasty Design Group, Magee Womens Hospital of UPMC, Pittsburgh, Pennsylvania, USA
| | - Rocky S Tuan
- Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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45
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Jung CJ, Hsu CC, Chen JW, Cheng HW, Yuan CT, Kuo YM, Hsu RB, Chia JS. PspC domain-containing protein (PCP) determines Streptococcus mutans biofilm formation through bacterial extracellular DNA release and platelet adhesion in experimental endocarditis. PLoS Pathog 2021; 17:e1009289. [PMID: 33577624 PMCID: PMC7906467 DOI: 10.1371/journal.ppat.1009289] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 02/25/2021] [Accepted: 01/07/2021] [Indexed: 11/19/2022] Open
Abstract
Bacterial extracellular DNA (eDNA) and activated platelets have been found to contribute to biofilm formation by Streptococcus mutans on injured heart valves to induce infective endocarditis (IE), yet the bacterial component directly responsible for biofilm formation or platelet adhesion remains unclear. Using in vivo survival assays coupled with microarray analysis, the present study identified a LiaR-regulated PspC domain-containing protein (PCP) in S. mutans that mediates bacterial biofilm formation in vivo. Reverse transcriptase- and chromatin immunoprecipitation-polymerase chain reaction assays confirmed the regulation of pcp by LiaR, while PCP is well-preserved among streptococcal pathogens. Deficiency of pcp reduced in vitro and in vivo biofilm formation and released the eDNA inside bacteria floe along with reduced bacterial platelet adhesion capacity in a fibrinogen-dependent manner. Therefore, LiaR-regulated PCP alone could determine release of bacterial eDNA and binding to platelets, thus contributing to biofilm formation in S. mutans-induced IE.
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Affiliation(s)
- Chiau-Jing Jung
- Department of Microbiology and Immunology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chih-Chieh Hsu
- Graduate Institute of Oral Biology, School of Dentistry, National Taiwan University, Taipei, Taiwan
| | - Jeng-Wei Chen
- Division of Cardiovascular Surgery, Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Hung-Wei Cheng
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Chang-Tsu Yuan
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
- Department of Pathology, National Taiwan University Cancer Center, Taipei, Taiwan
- Department of Pathology, National Taiwan University Hospital, Taipei, Taiwan
| | - Yu-Min Kuo
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Ron-Bin Hsu
- Division of Cardiovascular Surgery, Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
| | - Jean-San Chia
- Graduate Institute of Oral Biology, School of Dentistry, National Taiwan University, Taipei, Taiwan
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
- Graduate Institute of Immunology, College of Medicine, National Taiwan University, Taipei, Taiwan
- * E-mail:
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46
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Garcia D, Gardezi M, Suliman Y, Glasser J, Spake CS, Barrett C, Berns E, Jenkins D, Evans A, Cohen E, Eberson C, Hayda R, Daniels A, Green A, Owens B, Antoci V, Born CT. Fluorescent-conjugated antibodies as rapid ex vivo markers for bacterial presence on orthopedic surgical explants and synovium: A pilot study. J Orthop Res 2021; 39:299-307. [PMID: 33225467 DOI: 10.1002/jor.24924] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 10/20/2020] [Accepted: 11/19/2020] [Indexed: 02/04/2023]
Abstract
Surgical infection is one of the most pressing problems in the field of orthopedic surgery; however, current detection methods are plagued by high costs and long wait times. This study seeks to demonstrate the ability of a novel assay using fluorescently conjugated antibodies and confocal laser scanning microscopy (CLSM) to accurately detect bacterial presence on orthopedic surgical explants, tissue, and synovial fluid in 30 min. Explanted hardware, tissue, and synovial fluid samples suspected to be infected were collected from human subjects with institutional review board consent. Samples were prepared using a 30-min protocol, consisting of rinsing, nonspecific blocking and staining steps, and imaged using CLSM. Images were analyzed using ImageJ (National Institute of Health) to determine the percent area of Gram positive and Gram negative bacteria. Results of the assay were compared to the hospital's microbiological laboratory and Gram staining results. Ninety three samples were collected and tested using the 30-min testing protocol; 75 samples were synovial fluid and 18 were tissue and explants. Seventy four of 75 (98.6%) synovial fluid samples correlated with the hospital laboratory's microbiological findings. Of the 18 explant and tissue samples, our assay found bacterial presence in 14 of 18 samples, while the hospital microbiology laboratory found bacterial presence in 13 of 18 samples. This assay reliably stained and rapidly identified the presence of Gram negative and Gram positive bacteria on surgical explants, tissue and synovial fluid in 30 min. This methodology may serve as a point of service tool for the determination of bacterial presence during surgical procedures.
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Affiliation(s)
- Dioscaris Garcia
- The Diane N. Weiss Center for Orthopedic Trauma Research, Rhode Island Hospital, Providence, Rhode Island, USA.,Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
| | - Mursal Gardezi
- The Diane N. Weiss Center for Orthopedic Trauma Research, Rhode Island Hospital, Providence, Rhode Island, USA
| | - Yasmine Suliman
- The Diane N. Weiss Center for Orthopedic Trauma Research, Rhode Island Hospital, Providence, Rhode Island, USA
| | - Jillian Glasser
- The Diane N. Weiss Center for Orthopedic Trauma Research, Rhode Island Hospital, Providence, Rhode Island, USA
| | - Carole Sl Spake
- The Diane N. Weiss Center for Orthopedic Trauma Research, Rhode Island Hospital, Providence, Rhode Island, USA.,Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - Caitlin Barrett
- The Diane N. Weiss Center for Orthopedic Trauma Research, Rhode Island Hospital, Providence, Rhode Island, USA
| | - Ellis Berns
- The Diane N. Weiss Center for Orthopedic Trauma Research, Rhode Island Hospital, Providence, Rhode Island, USA.,Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - Derek Jenkins
- Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
| | - Andrew Evans
- Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
| | - Eric Cohen
- Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
| | - Craig Eberson
- Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
| | - Roman Hayda
- Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
| | - Alan Daniels
- Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
| | - Andrew Green
- Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
| | - Brett Owens
- Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
| | - Valentin Antoci
- Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
| | - Christopher T Born
- The Diane N. Weiss Center for Orthopedic Trauma Research, Rhode Island Hospital, Providence, Rhode Island, USA.,Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA.,Brown University Department of Orthopedic Surgery, Providence, Rhode Island, USA
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Akgun S, Sayiner HS. Comparison of Rapid and Routine Methods of Identification and Antibiotic Susceptibility Testing of Microorganisms from Blood Culture Bottles. Pol J Microbiol 2021; 69:1-12. [PMID: 32412189 PMCID: PMC7324860 DOI: 10.33073/pjm-2020-019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 03/15/2020] [Accepted: 03/29/2020] [Indexed: 11/28/2022] Open
Abstract
Reporting of the results of routine laboratory blood culture tests to clinicians is vital to the patients’ early treatment. This study aimed to perform identification and antibiotic susceptibility tests of the blood cultures showing positive signals of microbial growth in the first 12 hours of incubation by using centrifugation and Gram staining of 5 ml of liquid from the vial, thus achieving faster results. This study included 152 consecutively incubated blood culture samples showing positive microbial growth signals in the first 12 hours. The samples were centrifuged and then categorized into two groups (Gram-positive and Gram-negative) using Gram staining. Identification and antibiotic susceptibility tests were performed using an automated culture antibiogram device. For routine processing, media inoculated with positive blood culture were kept in the incubator for at least 24 hours. To compare the two methods in terms of the bacteria identification, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) of the growing colony was studied. By Gram staining, the same bacterial strains were obtained for 138 (92%) of the 152 samples, similar to the results of the procedures mentioned earlier. With the samples tested with both methods, the antibiotic susceptibility profiles were compared using the antibiogram results for 1,984 samples that underwent the antibiotic testing. A 97.4% (for 1,934 antibiotic susceptibility assays) agreement was observed between the two methods. Comparing the results of the post-centrifugation Gram staining to those obtained for the specimens using routine procedures, the clinicians reported a high success rate (approximately 97%).
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Affiliation(s)
- Sadik Akgun
- Adiyaman University , Faculty of Medicine , Department of Medical Microbiology , Adiyaman , Turkey
| | - Hakan Sezgin Sayiner
- Adiyaman University , Faculty of Medicine , Department of Infectious Diseases and Clinical Microbiology , Adiyaman , Turkey
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48
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Seesaard T, Thippakorn C, Kerdcharoen T, Kladsomboon S. A hybrid electronic nose system for discrimination of pathogenic bacterial volatile compounds. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:5671-5683. [PMID: 33225324 DOI: 10.1039/d0ay01255f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A hybrid electronic nose comprising an array of three organic-inorganic nanocomposite gas sensors [zinc tetra tert-butyl phthalocyanine (ZnTTBPc), zinc tetra-phenyl porphyrin (ZnTPP), and cobalt tetraphenyl-porphyrin (CoTPP)] coupled with three commercial metal-oxide semiconductor gas sensors (TGS 2444, TGS 2603 and TGS 2620) was developed to discriminate bacterial volatile compounds. Each type of gas sensor had its own strengths and weaknesses in terms of its capability to detect complex odors from the five different bacterial species tested. Bacterial samples were controlled at a fixed initial bacterial concentration by measuring the optical density at 600 nm of the culture suspensions. A comparative evaluation of the volatile compound fingerprints from five bacterial species grown in Luria-Bertani medium was conducted to identify the optimal incubation time for detection of volatile biomarkers to discriminate among bacteria. The results suggest that the hybrid electronic nose was indeed able to discriminate among the bacterial species and culture media, with a variance based on contributions of 92.4% from PC1 and 7.2% from PC2, at an incubation time of 6 hours. Furthermore, the results of hierarchical cluster analysis showed that bacterial odor data formed two major bacterial groups, with the maximum cluster distance close to 25. Intra-group similarity was demonstrated as the two bacterial species (E. cloacae and P. aeruginosa) from among the Gram-negative bacteria had a greater similarity with a cluster distance close to 4. Finally, the minimum distance between E. cloacae and S. Typhi was approximately 1, at an equal distance from E. coli and S. aureus.
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Affiliation(s)
- Thara Seesaard
- Department of Physics, Faculty of Science and Technology, Kanchanaburi Rajabhat University, Kanchanaburi, 71190, Thailand
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Harrington NE, Sweeney E, Harrison F. Building a better biofilm - Formation of in vivo-like biofilm structures by Pseudomonas aeruginosa in a porcine model of cystic fibrosis lung infection. Biofilm 2020; 2:100024. [PMID: 33381751 PMCID: PMC7762787 DOI: 10.1016/j.bioflm.2020.100024] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 03/24/2020] [Accepted: 04/24/2020] [Indexed: 12/20/2022] Open
Abstract
Pseudomonas aeruginosa biofilm infections in the cystic fibrosis (CF) lung are highly resistant to current antimicrobial treatments and are associated with increased mortality rates. The existing models for such infections are not able to reliably mimic the clinical biofilms observed. We aimed to further optimise an ex vivo pig lung (EVPL) model for P. aeruginosa CF lung infection that can be used to increase understanding of chronic CF biofilm infection. The EVPL model will facilitate discovery of novel infection prevention methods and treatments, and enhanced exploration of biofilm architecture. We investigated purine metabolism and biofilm formation in the model using transposon insertion mutants in P. aeruginosa PA14 for key genes: purD, gacA and pelA. Our results demonstrate that EVPL recapitulates a key aspect of in vivo P. aeruginosa infection metabolism, and that the pathogen forms a biofilm with a clinically realistic structure not seen in other in vitro studies. Two pathways known to be required for in vivo biofilm infection - the Gac regulatory pathway and production of the Pel exopolysaccharide - are essential to the formation of this mature, structured biofilm on EVPL tissue. We propose the high-throughput EVPL model as a validated biofilm platform to bridge the gap between in vitro work and CF lung infection.
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Affiliation(s)
- Niamh E. Harrington
- School of Life Sciences, Gibbet Hill Campus, The University of Warwick, Coventry, CV4 7AL, United Kingdom
| | - Esther Sweeney
- School of Life Sciences, Gibbet Hill Campus, The University of Warwick, Coventry, CV4 7AL, United Kingdom
| | - Freya Harrison
- School of Life Sciences, Gibbet Hill Campus, The University of Warwick, Coventry, CV4 7AL, United Kingdom
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50
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Ryu JS, Im SH, Kang YK, Kim YS, Chung HJ. Ultra-fast and universal detection of Gram-negative bacteria in complex samples based on colistin derivatives. Biomater Sci 2020; 8:2111-2119. [PMID: 31967117 DOI: 10.1039/c9bm01926j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gram-negative bacteria are a significant cause of infections acquired in both hospital and community settings, resulting in a high mortality rate worldwide. Currently, a Gram-negative infection is diagnosed by symptom evaluation and is treated with empiric antibiotics which target both Gram-negative and Gram-positive bacteria. A rapid and simple diagnostic method would enable immediate and targeted treatment, while dramatically reducing antibiotic overuse. Herein, we introduce a method utilizing a fluorescent derivative of colistin (COL-FL), that can directly label the Gram-negative cell wall of live bacteria and universally detect the targets within 10 min. By using the COL-FL assay, we achieved the differential labeling of various Gram-negative pathogens related to hospital-acquired infections, which could be subsequently detected via spectrofluorometry and microscopy. Further, we determined that our method can be used for complex samples, such as combinations of multiple bacterial types; bacteria in the presence of mammalian cells; and bacteria with serum components. This assay can be integrated into a simple diagnostic platform for rapid screening tests and the stratification of Gram-negative bacterial infections in the clinic.
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Affiliation(s)
- Jea Sung Ryu
- Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.
| | - San Hae Im
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Yoo Kyung Kang
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Yang Soo Kim
- Division of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Hyun Jung Chung
- Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea. and Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
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