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Ren Y, You X, Zhu R, Li D, Wang C, He Z, Hu Y, Li Y, Liu X, Li Y. Mutation of Pseudomonas aeruginosa lasI/rhlI diminishes its cytotoxicity, oxidative stress, inflammation, and apoptosis on THP-1 macrophages. Microbiol Spectr 2024; 12:e0414623. [PMID: 39162513 PMCID: PMC11448257 DOI: 10.1128/spectrum.04146-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 06/27/2024] [Indexed: 08/21/2024] Open
Abstract
The management of Pseudomonas aeruginosa (P. aeruginosa) infections presents a substantial challenge to clinics and public health, emphasizing the urgent need for innovative strategies to address this issue. Quorum sensing (QS) is an intercellular communication mechanism that coordinates bacterial activities involved in various virulence mechanisms, such as acquiring host nutrients, facilitating biofilm formation, enhancing motility, secreting virulence factors, and evading host immune responses, all of which play a crucial role in the colonization and infection of P. aeruginosa. The LasI/R and RhlI/R sub-systems dominate in the QS system of P. aeruginosa. Macrophages play a pivotal role in the host's innate immune response to P. aeruginosa invasion, particularly through phagocytosis as the initial host defense mechanism. This study investigated the effects of P. aeruginosa's QS system on THP-1 macrophages. Mutants of PAO1 with lasI/rhlI deletion, as well as their corresponding complemented strains, were obtained, and significant downregulation of QS-related genes was observed in the mutants. Furthermore, the ΔlasI and ΔlasIΔrhlI mutants exhibited significantly attenuated virulence in terms of biofilm formation, extracellular polymeric substances synthesis, bacterial adhesion, motility, and virulence factors production. When infected with ΔlasI and ΔlasIΔrhlI mutants, THP-1 macrophages exhibited enhanced scavenging ability against the mutants and demonstrated resistance to cytotoxicity, oxidative stress, inflammatory response, and apoptosis induced by the culture supernatants of these mutant strains. These findings offer novel insights into the mechanisms underlying how the lasI/rhlI mutation attenuates cytotoxicity, oxidative stress, inflammation, and apoptosis in macrophages induced by P. aeruginosa.IMPORTANCEP. aeruginosa is classified as one of the ESKAPE pathogens and poses a global public health concern. The QS system of this versatile pathogen contributes to a broad spectrum of virulence, thereby constraining therapeutic options for serious infections. This study illustrated that the lasI/rhlI mutation of the QS system plays a prominent role in attenuating the virulence of P. aeruginosa by affecting bacterial adhesion, biofilm formation, extracellular polymeric substances synthesis, bacterial motility, and virulence factors' production. Notably, THP-1 macrophages infected with mutant strains exhibited increased phagocytic activity in eliminating intracellular bacteria and enhanced resistance to cytotoxicity, oxidative stress, inflammation, and apoptosis. These findings suggest that targeted intervention toward the QS system is anticipated to diminish the pathogenicity of P. aeruginosa to THP-1 macrophages.
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Affiliation(s)
- Yanying Ren
- Dazhou integrated Traditional Chinese Medicine & Western Medicine Hospital, Dazhou Second People's Hospital, Dazhou, China
- Henan University of Chinese Medicine, Zhengzhou, China
| | - Xiaojuan You
- Henan University of Chinese Medicine, Zhengzhou, China
- Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Chinese Medicine, Zhenghzhou, China
| | - Rui Zhu
- Henan University of Chinese Medicine, Zhengzhou, China
- Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Chinese Medicine, Zhenghzhou, China
| | - Dengzhou Li
- Henan University of Chinese Medicine, Zhengzhou, China
- Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Chinese Medicine, Zhenghzhou, China
| | - Chunxia Wang
- Henan University of Chinese Medicine, Zhengzhou, China
- Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Chinese Medicine, Zhenghzhou, China
| | - Zhiqiang He
- Henan University of Chinese Medicine, Zhengzhou, China
- Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Chinese Medicine, Zhenghzhou, China
| | - Yue Hu
- Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Chinese Medicine, Zhenghzhou, China
| | - Yifan Li
- Henan University of Chinese Medicine, Zhengzhou, China
| | - Xinwei Liu
- Henan University of Chinese Medicine, Zhengzhou, China
- Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Chinese Medicine, Zhenghzhou, China
| | - Yongwei Li
- Henan University of Chinese Medicine, Zhengzhou, China
- Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Chinese Medicine, Zhenghzhou, China
- The Key Laboratory of Pathogenic Microbes &Antimicrobial Resistance Surveillance of Zhengzhou, Zhengzhou, China
- Henan Engineering Research Center for Identification of Pathogenic Microbes, Zhengzhou, China
- Henan Provincial Key Laboratory of Antibiotics-Resistant Bacterial Infection Prevention & Therapy with Traditional Chinese Medicine, Zhengzhou, China
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2
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Gao CH, Pan LX, Tan ZJ, Sun HZ, Sun MX, Wang JJ, Shen X, Su F, Yu RL. Double-network polyphenol chitosan hydrogels with instant aldehyde-β-cyclodextrin-based structure as potential for treating bacterially infected wounds. Int J Biol Macromol 2024; 278:134819. [PMID: 39154672 DOI: 10.1016/j.ijbiomac.2024.134819] [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: 05/11/2024] [Revised: 08/07/2024] [Accepted: 08/14/2024] [Indexed: 08/20/2024]
Abstract
Treatment of multiple bacterial infected wounds by eliminating bacteria and promoting tissue regeneration remains a clinical challenge. Herein, dual-network hydrogels (CS-GA/A-β-CD) with snap-structure were designed to achieve curcumin immobilization, using gallic acid-grafted chitosan (CS-GA) and aldehyde-β-cyclodextrin (A-β-CD) crosslinked. A-β-CD were able to achieve rapid dissolution (≥222.35 mg/mL H2O), and helped CS-GA/A-β-CD achieve rapid gelation (≤66.23 s). By adjusting the ratio of aldehyde groups of A-β-CD, mechanical properties and drug release can be controlled. CS-GA/A-β-CD/Cur exhibited excellent antimicrobial properties against S. aureus, E. coli, and P. aeruginosa. In vivo experiments demonstrated that CS-GA/A-β-CD/Cur achieved acute bacterial infection wound healing after 20th days, proving its great potential for wound dressing.
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Affiliation(s)
- Chi-Hao Gao
- State Key Laboratory Base of Eco-chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; Institute of High-Performance Polymers, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Li-Xia Pan
- State Key Laboratory Base of Eco-chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; Institute of High-Performance Polymers, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Zhao-Jun Tan
- State Key Laboratory Base of Eco-chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; Institute of High-Performance Polymers, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Hao-Zhi Sun
- State Key Laboratory Base of Eco-chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; Institute of High-Performance Polymers, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Meng-Xiao Sun
- State Key Laboratory Base of Eco-chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; Institute of High-Performance Polymers, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Jin-Jun Wang
- Qingdao Hiser Hospital Affiliated of Qingdao University, Qingdao Traditional Chinese Medicine Hospital, Qingdao 266033, China
| | - Xin Shen
- State Key Laboratory Base of Eco-chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; Institute of High-Performance Polymers, Qingdao University of Science and Technology, Qingdao 266042, China.
| | - Feng Su
- State Key Laboratory Base of Eco-chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; Institute of High-Performance Polymers, Qingdao University of Science and Technology, Qingdao 266042, China.
| | - Ri-Lei Yu
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.
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3
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Chai X, Lou Y, Nie L, Shavandi A, Yunusov KE, Sun Y, Jiang G. A three-dimensional printable conductive composite dressing for accelerating wound healing under electrical stimulation. Colloids Surf B Biointerfaces 2024; 245:114264. [PMID: 39332056 DOI: 10.1016/j.colsurfb.2024.114264] [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: 08/03/2024] [Revised: 09/10/2024] [Accepted: 09/21/2024] [Indexed: 09/29/2024]
Abstract
In this study, a bioink based on poly(vinyl alcohol) (PVA) and κ-carrageenan network was prepared using conductive polymer (PEDOT:PSS) as conducting medium, and (+)-Catechin-loaded mesoporous ZnO (CmZnO) as antibacterial and anti-inflammatory active medium. 3D conductive composite dressing was further fabricated by an extrusion 3D printing technology. Our results showed that the as-obtained composite dressing had suitable conductivity, efficient blood clotting capacity, and good adhesiveness. It also showed that the as-fabricated conductive composite had 92.9 % and 95.6 % antibacterial activity against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli), respectively. Furthermore, the conductive dressing with an optimal electrical stimulation (ES) parameter showed in vivo blood clotting capacity, and it enhanced in vivo wound healing process in a full-thickness skin defect model than commercial dressings by upregulating the gene expression of growth factors including CD-31 and downregulating inflammatory factor expression of IL-6.
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Affiliation(s)
- Xinxiang Chai
- School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China; International Scientific and Technological Cooperation Base of Intelligent Biomaterials and Functional Fibers of Zhejiang Province, Hangzhou 310018, China
| | - Yanzhen Lou
- School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China; International Scientific and Technological Cooperation Base of Intelligent Biomaterials and Functional Fibers of Zhejiang Province, Hangzhou 310018, China
| | - Lei Nie
- College of Life Sciences, Xinyang Normal University, Xinyang 464000, China
| | - Amin Shavandi
- Université libre de Bruxelles (ULB), École polytechnique de Bruxelles, 3BIO, BioMatter, Avenue F.D. Roosevelt, 50 - CP 165/61, Brussels 1050, Belgium
| | - Khaydar E Yunusov
- Institute of Polymer Chemistry and Physics, Uzbekistan Academy of Sciences, Tashkent 100128, Uzbekistan
| | - Yanfang Sun
- College of Life Science and Medical Medicine, Zhejiang Sci-Tech University, 310018, China
| | - Guohua Jiang
- School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China; International Scientific and Technological Cooperation Base of Intelligent Biomaterials and Functional Fibers of Zhejiang Province, Hangzhou 310018, China.
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Jonker L, Todhunter J, Mutch R, Lowes D, Messenger G. Identification of High-Risk Lower Extremity Wounds Using Point-of-Care Test for Bacterial Protease Activity; A Single-Centre, Single-Blinded, Prospective Study. INT J LOW EXTR WOUND 2024:15347346241284804. [PMID: 39275845 DOI: 10.1177/15347346241284804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/16/2024]
Abstract
Clinician observation is the mainstay to determine if wound infection is present, and focuses on presence of erythema, purulence, and odour. However, non-visible bacterial protease activity can delay wound healing and lead to complications. In this study, a point-of-care test to detect the presence of bacterial protease activity (BPA, tested with Woundchek Bacterial Status test) was appraised. A total of 130 patients with lower extremity wounds were recruited in vascular and podiatry clinics, and across two time-points 182 BPA tests were conducted subsequent to initial (blinded) clinician's wound appraisal. Clinical opinion ('no infection', 'possible' or 'definite' infection) and BPA result (negative or positive test) had a moderate Kendall's tau-c rank correlation coefficient of 0.32 (P < 0.001). Binary logistic regression analysis and principal component analysis showed that infection determined by clinical opinion was significantly associated with abovementioned clinical signs and a positive BPA test. However, a positive BPA result was also significantly linked with wound severity, such as number of lesions, chronicity and size. Throughout a 12-week follow-up period, median ulcer size was larger for wounds positive for BPA test at baseline (P 0.001) and week-12 (P 0.036; both Mann-Whitney U-test) respectively. As a pilot initiative, clinical staff were allowed to act on the BPA result if they wished; in 11 out of 71 test-positive cases (15%) this happened and antimicrobial dressing was applied instead of planned standard dressing. These results show that protease-releasing bacteria may be active in ulcers that do not (yet) exhibit hallmark signs of infection, and are associated with delayed healing. Targeted point-of-care testing for bacterial protease activity may have the potential to identify and enable pro-active (antimicrobial) management of these high-risk wounds.
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Affiliation(s)
- Leon Jonker
- Science Manager, North Cumbria Integrated Care NHS FT, Carlisle, UK
- Visiting Professor, University of Cumbria, Carlisle, UK
| | - Jane Todhunter
- Specialist Vascular Nurse, North Cumbria Integrated Care NHS FT, Carlisle, UK
| | - Rachel Mutch
- Research Nurse, North Cumbria Integrated Care NHS FT, Whitehaven, UK
| | - Donna Lowes
- Research Practitioner, North Cumbria Integrated Care NHS FT, Carlisle, UK
| | - Grace Messenger
- Lead Podiatrist, North Cumbria Integrated Care NHS FT, Carlisle, UK
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Hajihosseintehrani M, Amini A, Heidari M, Gholipourmalekabadi M, Fadaei Fathabady F, Mostafavinia A, Ahmadi H, Khodadadi M, Naser R, Zare F, Alizadeh S, Moeinian N, Chien S, Bayat M. The Application of Photobiomodulation and Stem Cells Seeded on the Scaffold Accelerates the Wound Healing Process in Mice. J Lasers Med Sci 2024; 15:e40. [PMID: 39381785 PMCID: PMC11459249 DOI: 10.34172/jlms.2024.40] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Accepted: 05/08/2024] [Indexed: 10/10/2024]
Abstract
Introduction: The purpose of this research was to test the impact of seeding a hydrogel chitosan scaffold (HCS) with human adipose-derived stem cells (hADSCs) under the influence of photobiomodulation (PBM) on the remodeling step on the wound repairing process in mice. Methods: Thirty mice were randomly assigned to five groups (n=6 per group ): The control group (group 1) consisted of mice without any intervention. In group 2, an HCS was implanted into the wound. In group 3, a combination of HCS+hADSC was inserted into the wound. In group 4, an HCS was inserted into the wound and PBM was applied. In group 5, a combination of HCS+hADSCs was inserted into the wound, followed by PBM treatment. Results: Improvements in the injury closing rate (WCR) and microbial flora were observed in all groups. However, the highest WCRs were observed in group s 5, 4, 3, and 2 (all P values were 0.000). Groups 3-5 showed increased wound strength compared to group s 1 and 2, with group 2 demonstrating better results than group 1 (P values ranged from 0.000 to 0.013). Although group s 3-5 showed increases in certain stereological elements compared to group s 1 and 2, group 2 exhibited superior results in comparison with group 1 (P values ranged from 0.000 to 0.049). Conclusion: The joined use of HCS+hADSCs+PBM significantly accelerated the wound healing process during the maturation phase in healthy mice. This approach demonstrated superior wound healing compared to the use of HCS alone, hADSCs+HCS, or PBM+HCS. The findings suggest an additive effect when HCS+hADSCs+PBM are combined.
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Affiliation(s)
- Masoumeh Hajihosseintehrani
- Department of Biology and Anatomical Sciences at Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Abdollah Amini
- Department of Biology and Anatomical Sciences at Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Mohammadhossein Heidari
- Department of Biology and Anatomical Sciences at Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Mazaher Gholipourmalekabadi
- Department of Tissue Engineering & Regenerative Medicine, Iran University of Medical Sciences, Hemmat Highway, Tehran, Iran
| | - Fatemeh Fadaei Fathabady
- Department of Biology and Anatomical Sciences at Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Atarodalsadat Mostafavinia
- Department of Anatomical Sciences and Cognitive Neuroscience at the Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Houssein Ahmadi
- Department of Biology and Anatomical Sciences at Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Maryam Khodadadi
- Xi’an jiaotong University School of Stomatology, Xi’an, Shaanxi Province, China
| | - Reza Naser
- Tissue Engineering Department, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Fateme Zare
- Department of Biology and Anatomical Sciences at Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Sanaz Alizadeh
- Department of Anatomical Sciences and Cognitive Neuroscience at the Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Nafiseh Moeinian
- Department of Biology and Anatomical Sciences at Shahid Beheshti University of Medical Sciences (SBMU), Tehran, Iran
| | - Sufan Chien
- Price Institute of Surgical Research at the University of Louisville and Noveratech LLC of Louisville in Louisville, KY, USA
| | - Mohammad Bayat
- Department of Tissue Engineering & Regenerative Medicine, Iran University of Medical Sciences, Hemmat Highway, Tehran, Iran
- Price Institute of Surgical Research at the University of Louisville and Noveratech LLC of Louisville in Louisville, KY, USA
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6
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Ribeiro ARM, Miranda CS, Silva AFG, Mendes FDP, Silva BM, Oliveira BAS, Paiva ED, Gonçalves SP, Pereira-Lima SMMA, Costa SPG, Felgueiras HP. Inhibition of Enzyme and Bacteria Activities in Diabetic Ulcer-like Scenarios via WAAPV-Loaded Electrospun Fibers. Pharmaceutics 2024; 16:911. [PMID: 39065608 PMCID: PMC11280037 DOI: 10.3390/pharmaceutics16070911] [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: 05/29/2024] [Revised: 07/01/2024] [Accepted: 07/04/2024] [Indexed: 07/28/2024] Open
Abstract
In diabetic ulcers, an increased secretion of human neutrophil elastase (HNE) and bacterial infections play crucial roles in hindering healing. Considering that, the present study proposed the development of multi-action polycaprolactone (PCL)/polyethylene glycol (PEG) electrospun fibers incorporating elastase-targeting peptides, AAPV and WAAPV, via blending. Characterization confirmed WAAPV's efficacy in regulating proteolytic enzymes by inhibiting HNE. The engineered fibers, particularly those containing PEG, exhibited optimal wettability but an accelerated degradation that was mitigated with the peptide's inclusion, thus promoting a sustained peptide release over 24 h. Peptide loading was verified indirectly through thermal stability and hydration capacity studies (hydrophobic bonding between PCL and WAAPV and hydrophilic affinities between PCL/PEG and AAPV) and determined at ≈51.1 µg/cm2 and ≈46.0 µg/cm2 for AAPV and ≈48.5 µg/cm2 and ≈51.3 µg/cm2 for WAAPV, respectively, for PCL and PCL/PEG. Both AAPV and WAAPV effectively inhibited HNE, with PEG potentially enhancing this effect by interacting with the peptides and generating detectable peptide-PEG complexes (≈10% inhibition with PCL + peptide fibers after 6 h of incubation, and ≈20% with PCL/PEG + peptide fibers after 4 h incubation). Peptide-loaded fibers demonstrated antibacterial efficacy against Staphylococcus aureus (up to ≈78% inhibition) and Escherichia coli (up to ≈66% inhibition), with peak effectiveness observed after 4 and 2 h of incubation, respectively. This study provides initial insights into the WAAPV's potential for inhibiting HNE and bacteria activities, showing promise for applications in diabetic ulcer management.
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Affiliation(s)
- Ana R. M. Ribeiro
- Centre for Textile Science and Technology (2C2T), University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal; (A.R.M.R.); (C.S.M.); (B.M.S.); (B.A.S.O.); (E.D.P.); (S.P.G.)
| | - Catarina S. Miranda
- Centre for Textile Science and Technology (2C2T), University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal; (A.R.M.R.); (C.S.M.); (B.M.S.); (B.A.S.O.); (E.D.P.); (S.P.G.)
| | - Ana Francisca G. Silva
- Centre of Chemistry (CQ), University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; (A.F.G.S.); (S.M.M.A.P.-L.); (S.P.G.C.)
| | - Filipa D. P. Mendes
- Centre of Chemistry (CQ), University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; (A.F.G.S.); (S.M.M.A.P.-L.); (S.P.G.C.)
| | - Beatriz M. Silva
- Centre for Textile Science and Technology (2C2T), University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal; (A.R.M.R.); (C.S.M.); (B.M.S.); (B.A.S.O.); (E.D.P.); (S.P.G.)
| | - Bruna A. S. Oliveira
- Centre for Textile Science and Technology (2C2T), University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal; (A.R.M.R.); (C.S.M.); (B.M.S.); (B.A.S.O.); (E.D.P.); (S.P.G.)
| | - Eduardo D. Paiva
- Centre for Textile Science and Technology (2C2T), University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal; (A.R.M.R.); (C.S.M.); (B.M.S.); (B.A.S.O.); (E.D.P.); (S.P.G.)
| | - Sónia P. Gonçalves
- Centre for Textile Science and Technology (2C2T), University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal; (A.R.M.R.); (C.S.M.); (B.M.S.); (B.A.S.O.); (E.D.P.); (S.P.G.)
| | - Sílvia M. M. A. Pereira-Lima
- Centre of Chemistry (CQ), University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; (A.F.G.S.); (S.M.M.A.P.-L.); (S.P.G.C.)
| | - Susana P. G. Costa
- Centre of Chemistry (CQ), University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; (A.F.G.S.); (S.M.M.A.P.-L.); (S.P.G.C.)
| | - Helena P. Felgueiras
- Centre for Textile Science and Technology (2C2T), University of Minho, Campus of Azurém, 4800-058 Guimarães, Portugal; (A.R.M.R.); (C.S.M.); (B.M.S.); (B.A.S.O.); (E.D.P.); (S.P.G.)
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7
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El-Sayed GM, Agwa MM, Emam MTH, Kandil H, Abdelhamid AE, Nour SA. Utilizing immobilized recombinant serine alkaline protease from Bacillus safensis lab418 in wound healing: Gene cloning, heterologous expression, optimization, and characterization. Int J Biol Macromol 2024; 270:132286. [PMID: 38735612 DOI: 10.1016/j.ijbiomac.2024.132286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 04/14/2024] [Accepted: 05/09/2024] [Indexed: 05/14/2024]
Abstract
Microbial proteases have proven their efficiency in various industrial applications; however, their application in accelerating the wound healing process has been inconsistent in previous studies. In this study, heterologous expression was used to obtain an over-yielding of the serine alkaline protease. The serine protease-encoding gene aprE was isolated from Bacillus safensis lab 418 and expressed in E. coli BL21 (DE3) using the pET28a (+) expression vector. The gene sequence was assigned the accession number OP610065 in the NCBI GenBank. The open reading frame of the recombinant protease (aprEsaf) was 383 amino acids, with a molecular weight of 35 kDa. The yield of aprEsaf increased to 300 U/mL compared with the native serine protease (SAFWD), with a maximum yield of 77.43 U/mL after optimization conditions. aprEsaf was immobilized on modified amine-functionalized films (MAFs). By comparing the biochemical characteristics of immobilized and free recombinant enzymes, the former exhibited distinctive biochemical characteristics: improved thermostability, alkaline stability over a wider pH range, and efficient reusability. The immobilized serine protease was effectively utilized to expedite wound healing. In conclusion, our study demonstrates the suitability of the immobilized recombinant serine protease for wound healing, suggesting that it is a viable alternative therapeutic agent for wound management.
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Affiliation(s)
- Ghada M El-Sayed
- Microbial Genetics Department, Biotechnology Research Institute, National Research Centre, Egypt
| | - Mona M Agwa
- Chemistry of Natural and Microbial Products Department, Pharmaceutical and Drug Industries Research Institute, National Research Centre, Egypt
| | - Maha T H Emam
- Genetics and Cytology Department, Biotechnology Research Institute, National Research Centre, Egypt.
| | - Heba Kandil
- Polymers and Pigments Department, National Research Centre, Egypt
| | | | - Shaimaa A Nour
- Chemistry of Natural and Microbial Products Department, Pharmaceutical and Drug Industries Research Institute, National Research Centre, Egypt
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8
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Benny AT, Thamim M, Srivastava P, Suresh S, Thirumoorthy K, Rangasamy L, S K, Easwaran N, Radhakrishnan EK. Synthesis and study of antibiofilm and antivirulence properties of flavonol analogues generated by palladium catalyzed ligand free Suzuki-Miyaura coupling against Pseudomonas aeruginosa PAO1. RSC Adv 2024; 14:12278-12293. [PMID: 38633488 PMCID: PMC11019961 DOI: 10.1039/d3ra08617h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Accepted: 04/08/2024] [Indexed: 04/19/2024] Open
Abstract
The Suzuki-Miyaura coupling is one of the ubiquitous method for the carbon-carbon bond-forming reactions in organic chemistry. Its popularity is due to its ability to undergo extensive coupling reactions to generate a broad range of biaryl motifs in a straightforward manner displaying a high level of functional group tolerance. A convenient and efficient synthetic route to arylate different substituted flavonols through the Suzuki-Miyaura cross-coupling reaction has been explained in this study. The arylated products were acquired by the coupling of a variety of aryl boronic acids with flavonols under Pd(OAc)2 catalyzed reaction conditions in a ligand-free reaction strategy. Subsequently, the antibiofilm and antivirulence properties of the arylated flavonols against Pseudomonas aeruginosa PAO1 were studied thoroughly. The best ligands for quorum sensing proteins LasR, RhlR, and PqsR were identified using molecular docking study. These best fitting ligands were then studied for their impact on gene expression level of P. aeruginosa by RT-PCR towards quorum sensing genes lasB, rhlA, and pqsE. The downregulation in the gene expression with the effect of synthesized flavonols endorse the antibiofilm efficiency of the compounds.
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Affiliation(s)
- Anjitha Theres Benny
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology Vellore-632014 India
| | - Masthan Thamim
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology Vellore-632014 India
| | | | - Sindoora Suresh
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology Vellore-632014 India
| | - Krishnan Thirumoorthy
- Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology Vellore-632014 India
| | - Loganathan Rangasamy
- Centre for Biomaterials, Cellular and Molecular Theranostics (CBCMT), Vellore Institute of Technology Vellore-632014 India
| | - Karthikeyan S
- Department of Biotechnology, School of Bioscience and Technology, Vellore Institute of Technology Vellore-632014 India
| | - Nalini Easwaran
- Department of Integrative Biology, School of Bioscience and Technology, Vellore Institute of Technology VIT Vellore-632014 India
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9
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Ji S, Xiao S, Xia Z. Consensus on the treatment of second-degree burn wounds (2024 edition). BURNS & TRAUMA 2024; 12:tkad061. [PMID: 38343901 PMCID: PMC10858447 DOI: 10.1093/burnst/tkad061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 11/29/2023] [Accepted: 12/08/2023] [Indexed: 02/21/2024]
Abstract
Second-degree burns are the most common type of burn in clinical practice and hard to manage. Their treatment requires not only a consideration of the different outcomes that may arise from the dressing changes or surgical therapies themselves but also an evaluation of factors such as the burn site, patient age and burn area. Meanwhile, special attention should be given to the fact that there is no unified standard or specification for the diagnosis, classification, surgical procedure, and infection diagnosis and grading of second-degree burn wounds. This not only poses great challenges to the formulation of clinical treatment plans but also significantly affects the consistency of clinical studies. Moreover, currently, there are relatively few guidelines or expert consensus for the management of second-degree burn wounds, and no comprehensive and systematic guidelines or specifications for the treatment of second-degree burns have been formed. Therefore, we developed the Consensus on the Treatment of Second-Degree Burn Wounds (2024 edition), based on evidence-based medicine and expert opinion. This consensus provides specific recommendations on prehospital first aid, nonsurgical treatment, surgical treatment and infection treatment for second-degree burns. The current consensus generated a total of 58 recommendations, aiming to form a standardized clinical treatment plan.
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Affiliation(s)
- Shizhao Ji
- Correspondence: Shizhao Ji, ; Shichu Xiao, ; Zhaofan Xia,
| | - Shichu Xiao
- Correspondence: Shizhao Ji, ; Shichu Xiao, ; Zhaofan Xia,
| | - Zhaofan Xia
- Correspondence: Shizhao Ji, ; Shichu Xiao, ; Zhaofan Xia,
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10
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Rahman A, Sardar S, Niaz Z, Khan A, Sheheryar S, Alrefaei AF, Hamayun M, Ali S. Lipase and Protease Production Ability of Multi-drug Resistant Bacteria Worsens the Outcomes of Wound Infections. Curr Pharm Des 2024; 30:1307-1316. [PMID: 38629357 DOI: 10.2174/0113816128302189240402043330] [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] [Accepted: 03/05/2024] [Indexed: 07/09/2024]
Abstract
BACKGROUND Surgical site infections are one of the major clinical problems in surgical departments that cost hundreds of millions of dollars to healthcare systems around the world. AIM The study aimed to address the pressing issue of surgical site infections, which pose significant clinical and financial burdens on healthcare systems globally. Recognizing the substantial costs incurred due to these infections, the research has focused on understanding the role of lipase and protease production by multi-drug resistant bacteria isolated from surgical wounds in the development of post-surgical wound infections. METHODS For these purposes, 153 pus specimens were collected from patients with severe post-surgical wound infections having prolonged hospital stays. The specimens were inoculated on appropriate culture media. Gram staining and biochemical tests were used for the identification of bacterial growth on suitable culture media after 24 hours of incubation. The isolated pathogens were then applied for lipase and protease, key enzymes that could contribute to wound development, on tributyrin and skimmed milk agar, respectively. Following the CSLI guidelines, the Kirby-Bauer disc diffusion method was used to assess antibiotic susceptibility patterns. The results revealed that a significant proportion of the samples (127 out of 153) showed bacterial growth of Gram-negative (n = 66) and Gram-positive (n = 61) bacteria. In total, isolated 37 subjects were declared MDR due to their resistance to three or more than three antimicrobial agents. The most prevalent bacteria were Staphylococcus aureus (29.13%), followed by S. epidermidis (18.89%), Klebsiella pneumoniae (18.89%), Escherichia coli (14.96%), Pseudomonas aeruginosa (10.23%), and Proteus mirabilis (7.87%). Moreover, a considerable number of these bacteria exhibited lipase and protease activity with 70 bacterial strains as lipase positive on tributyrin agar, whereas 74 bacteria showed protease activity on skimmed milk agar with P. aeruginosa as the highest lipase (69.23%) and protease (76.92%) producer, followed by S. aureus (lipase 62.16% and protease 70.27%). RESULTS The antimicrobial resistance was evaluated among enzyme producers and non-producers and it was found that the lipase and protease-producing bacteria revealed higher resistance to selected antibiotics than non-producers. Notably, fosfomycin and carbapenem were identified as effective antibiotics against the isolated bacterial strains. However, gram-positive bacteria displayed high resistance to lincomycin and clindamycin, while gram-negative bacteria were more resistant to cefuroxime and gentamicin. CONCLUSION In conclusion, the findings suggest that lipases and proteases produced by bacteria could contribute to drug resistance and act as virulence factors in the development of surgical site infections. Understanding the role of these enzymes may inform strategies for preventing and managing post-surgical wound infections more effectively.
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Affiliation(s)
- Attaur Rahman
- Laboratório de Hanseníase, Department of Parasitology, Institute Oswaldo Cruz-Fiocruz, Rio de Janeiro, RJ, Brazil
| | - Saiqa Sardar
- Malaria Research Laboratory, Departament of Parasitology, Institute Oswaldo Cruz-Fiocruz, Rio de Janeiro, RJ, Brazil
| | - Zeeshan Niaz
- Department of Microbiology, Hazara University, Mansehra, Pakistan
| | - Asif Khan
- Laboratory of Phytochemistry, Department of Botany, University of São Paulo, São Paulo, Brazil
| | - Sheheryar Sheheryar
- Department of Biochemistry and Molecular Biology, Federal University of Ceara, Fortaleza, Brazil
| | | | - Muhammad Hamayun
- Department of Botany, Abdul Wali Khan University Mardan, Mardan, Pakistan
| | - Sajid Ali
- Department of Horticulture and Life Science, Yeungnam University, Gyeongsan, South Korea
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11
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Andalib E, Kashfi M, Mahmoudvand G, Rezaei E, Mahjoor M, Torki A, Afkhami H. Application of hypoxia-mesenchymal stem cells in treatment of anaerobic bacterial wound infection: wound healing and infection recovery. Front Microbiol 2023; 14:1251956. [PMID: 37869672 PMCID: PMC10586055 DOI: 10.3389/fmicb.2023.1251956] [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: 07/03/2023] [Accepted: 09/18/2023] [Indexed: 10/24/2023] Open
Abstract
Mesenchymal stromal cells, commonly referred to as MSCs, are a type of multipotent stem cells that are typically extracted from adipose tissue and bone marrow. In the field of tissue engineering and regenerative medicine, MSCs and their exosomes have emerged as revolutionary tools. Researchers are now devoting greater attention to MSCs because of their ability to generate skin cells like fibroblasts and keratinocytes, as well as their distinctive potential to decrease inflammation and emit pro-angiogenic molecules at the site of wounds. More recent investigations revealed that MSCs can exert numerous direct and indirect antimicrobial effects that are immunologically mediated. Collectively, these antimicrobial properties can remove bacterial infections when the MSCs are delivered in a therapeutic setting. Regardless of the positive therapeutic potential of MSCs for a multitude of conditions, transplanted MSC cell retention continues to be a major challenge. Since MSCs are typically administered into naturally hypoxic tissues, understanding the impact of hypoxia on the functioning of MSCs is crucial. Hypoxia has been postulated to be among the factors determining the differentiation of MSCs, resulting in the production of inflammatory cytokines throughout the process of tissue regeneration and wound repair. This has opened new horizons in developing MSC-based systems as a potent therapeutic tool in oxygen-deprived regions, including anaerobic wound infection sites. This review sheds light on the role of hypoxia-MSCs in the treatment of anaerobic bacterial wound infection in terms of both their regenerative and antimicrobial activities.
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Affiliation(s)
- Elahe Andalib
- Department of Microbiology, School of Basic Sciences, Islamic Azad University Science and Research Branch, Tehran, Iran
| | - Mojtaba Kashfi
- Nervous System Stem Cells Research Center, Semnan University of Medical Sciences, Semnan, Iran
- Cellular and Molecular Research Center, Qom University of Medical Sciences, Qom, Iran
- Department of Medical Microbiology, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Golnaz Mahmoudvand
- Student Research Committee, USERN Office, Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Elaheh Rezaei
- Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Mohamad Mahjoor
- Cellular and Molecular Research Center, Qom University of Medical Sciences, Qom, Iran
- Department of Immunology, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Alireza Torki
- Department of Medical Microbiology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
- Department of Medical Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Hamed Afkhami
- Nervous System Stem Cells Research Center, Semnan University of Medical Sciences, Semnan, Iran
- Cellular and Molecular Research Center, Qom University of Medical Sciences, Qom, Iran
- Department of Medical Microbiology, Faculty of Medicine, Shahed University, Tehran, Iran
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12
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Jacob A, Jones LM, Abdo RJ, Cruz‐Schiavone SF, Skerker R, Caputo WJ, Krehbiel N, Moyer‐Harris AK, McAtee A, Baker I, Gray MD, Rennie MY. Lights, fluorescence, action-Influencing wound treatment plans including debridement of bacteria and biofilms. Int Wound J 2023; 20:3279-3288. [PMID: 37132372 PMCID: PMC10502265 DOI: 10.1111/iwj.14208] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 04/06/2023] [Accepted: 04/12/2023] [Indexed: 05/04/2023] Open
Abstract
High bacterial loads within chronic wounds increase the risk of infection and complication. Detection and localization of bacterial loads through point-of-care fluorescence (FL) imaging can objectively inform and support bacterial treatment decisions. This single time-point, retrospective analysis describes the treatment decisions made on 1000 chronic wounds (DFUs, VLUs, PIs, surgical wounds, burns, and others) at 211 wound-care facilities across 36 US states. Clinical assessment findings and treatment plans derived from them, as well as subsequent FL-imaging (MolecuLight®) findings and any associated treatment plan changes, were recorded for analysis. FL signals indicating elevated bacterial loads were observed in 701 wounds (70.8%), while only 293 (29.6%) showed signs/symptoms of infection. After FL-imaging, treatment plans changed in 528 wounds as follows: more extensive debridement (18.7%), more extensive hygiene (17.2%), FL-targeted debridement (17.2%), new topical therapies (10.1%), new systemic antibiotic prescriptions (9.0%), FL-guided sampling for microbiological analysis (6.2%), and changes in dressing selection (3.2%). These real-world findings of asymptomatic bacterial load/biofilm incidence, and of the frequent treatment plan changes post-imaging, are in accordance with clinical trial findings using this technology. These data, from a range of wound types, facilities, and clinician skill sets, suggest that point-of-care FL-imaging information improves bacterial infection management.
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13
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Rancan F, Jurisch J, Hadam S, Vogt A, Blume-Peytavi U, Bayer IS, Contardi M, Schaudinn C. Ciprofloxacin-Loaded Polyvinylpyrrolidone Foils for the Topical Treatment of Wound Infections with Methicillin-Resistant Staphylococcus aureus (MRSA). Pharmaceutics 2023; 15:1876. [PMID: 37514062 PMCID: PMC10385417 DOI: 10.3390/pharmaceutics15071876] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/23/2023] [Accepted: 06/30/2023] [Indexed: 07/30/2023] Open
Abstract
Bacterial infections are a constant challenge in the management of acute and chronic wounds. Chronic wounds, such as diabetic foot ulcers, have increased significantly in the last few years due to the rise of an aging population. A better understanding of the infectious pathophysiological mechanisms is urgently needed along with new options for the treatment of wound infections and wound-healing disorders. New advances in the preparation of biocompatible dressing materials that can be loaded with antimicrobial drugs may improve the topical treatment of infected wounds. In this study, we investigated the antimicrobial activity of polyvinylpyrrolidone (PVP) foils loaded with ciprofloxacin (Cipro-foils) in the presence of acetic acid as a co-solvent. We used ex vivo human wounds that were infected with two bacterial strains: methicillin-resistant Staphylococcus aureus (MRSA) or Pseudomonas aeruginosa (PAO1). The effectiveness of the treatment was demonstrated by the quantification of the living bacteria extracted from the wound and the detection of released immunological mediators in skin extracts and in the skin culture media. We found that Cipro-foils effectively treated the infection with both PAO1 and MRSA. Other than PAO1, MRSA had no lytic activity toward skin proteins. MRSA infections increased cytokines' expression and release. Interestingly, treatment with Cipro-foils could partially counteract these effects.
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Affiliation(s)
- Fiorenza Rancan
- Department of Dermatology, Venereology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
| | - Jana Jurisch
- Department of Dermatology, Venereology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
| | - Sabrina Hadam
- Department of Dermatology, Venereology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
| | - Annika Vogt
- Department of Dermatology, Venereology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
| | - Ulrike Blume-Peytavi
- Department of Dermatology, Venereology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 10117 Berlin, Germany
| | - Ilker S Bayer
- Smart Materials, Istituto Italiano di Tecnologia, 16163 Genova, Italy
| | - Marco Contardi
- Smart Materials, Istituto Italiano di Tecnologia, 16163 Genova, Italy
- Department of Earth and Environmental Sciences (DISAT), University of Milan-Bicocca, Piazza della Scienza, 20126 Milan, Italy
| | - Christoph Schaudinn
- Advanced Light and Electron Microscopy, Zentrum für Biologische Gefahren und Spezielle Pathogene 4, Robert Koch Institute, 13353 Berlin, Germany
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14
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Cullen B, Gefen A. The biological and physiological impact of the performance of wound dressings. Int Wound J 2023; 20:1292-1303. [PMID: 36110054 PMCID: PMC10031231 DOI: 10.1111/iwj.13960] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 08/27/2022] [Accepted: 08/29/2022] [Indexed: 11/27/2022] Open
Abstract
Chronic wounds affect millions globally and are a huge financial burden. Whilst there are many wound dressings commercially available to manage these wounds, the complexity of the repair process makes it difficult to select the right dressing for the right wound at the right time. Thus, in this narrative review, we have examined reasons why wounds fail to heal, summarised the pathophysiology of the chronic wound environment and provided an evidence-based, clinically-relevant compilation of the published literature relevant to dressing design and evaluation. This has highlighted the need for a deeper understanding of wound exudates, how exudates change throughout the healing process, and how they are impacted by different dressing materials. Studies assessing biochemical and biophysical changes in exudates throughout the healing process are extremely valuable in this regard, enhancing both our understanding of the wound healing process and the ability to assess dressing performance. In addition, this knowledge allows us to replicate various wound conditions in the laboratory, and develop clinically-relevant models for testing current and new dressings, therefore providing a more comprehensive understanding of how and when they should be used. This approach makes the use of dressings more effective, thereby improving outcomes, and reducing the economic burden of chronic wounds.
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Affiliation(s)
| | - Amit Gefen
- Department of Biomedical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel
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15
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Paine H, Jones F, Kinross J. Preparing the Bowel (Microbiome) for Surgery: Surgical Bioresilience. Clin Colon Rectal Surg 2023; 36:138-145. [PMID: 36844712 PMCID: PMC9946716 DOI: 10.1055/s-0042-1760675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
The preparation of the bowel for radical surgery is a corner stone of elective colorectal practice. The evidence for this intervention is of variable quality and it is often contradictory, yet there is now a global move toward the adoption of oral antibiotic therapy for the reduction of perioperative infective complications, such as surgical site infections. The gut microbiome is a critical mediator of the systemic inflammatory response to surgical injury, wound healing, and perioperative gut function. The loss of critical microbial symbiotic functions caused by bowel preparation and surgery has an adverse impact on surgical outcomes, yet the mechanisms through which this occurs are poorly defined. In this review, the evidence for bowel preparation strategies is critically appraised in the context of the gut microbiome. The impact of antibiotic therapy on the surgical gut microbiome and the importance of the intestinal "resistome" to surgical recovery is described. Data to support the augmentation of the microbiome through diet, probiotic and symbiotic approaches, as well as fecal transplantation are also appraised. Finally, we propose a novel strategy of bowel preparation defined as " surgical bioresilience " and define areas or prioritization in this emerging field. This describes the optimization of surgical intestinal homeostasis and core surgical exposome-microbiome interactions that regulate the wound immune microenvironment, the systemic inflammatory response to surgical injury, and gut function across the perioperative time course.
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Affiliation(s)
- Heidi Paine
- Division of General Surgery, Imperial College Healthcare NHS Trust, London, United Kingdom
| | - Faye Jones
- Division of General Surgery, King Edward VII Hospital, London, United Kingdom
| | - James Kinross
- Division of Colorectal Surgery, Department of Surgery and Cancer, Imperial College London, London, United Kingdom
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16
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Flemming HC, van Hullebusch ED, Neu TR, Nielsen PH, Seviour T, Stoodley P, Wingender J, Wuertz S. The biofilm matrix: multitasking in a shared space. Nat Rev Microbiol 2023; 21:70-86. [PMID: 36127518 DOI: 10.1038/s41579-022-00791-0] [Citation(s) in RCA: 179] [Impact Index Per Article: 179.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/04/2022] [Indexed: 01/20/2023]
Abstract
The biofilm matrix can be considered to be a shared space for the encased microbial cells, comprising a wide variety of extracellular polymeric substances (EPS), such as polysaccharides, proteins, amyloids, lipids and extracellular DNA (eDNA), as well as membrane vesicles and humic-like microbially derived refractory substances. EPS are dynamic in space and time and their components interact in complex ways, fulfilling various functions: to stabilize the matrix, acquire nutrients, retain and protect eDNA or exoenzymes, or offer sorption sites for ions and hydrophobic substances. The retention of exoenzymes effectively renders the biofilm matrix an external digestion system influencing the global turnover of biopolymers, considering the ubiquitous relevance of biofilms. Physico-chemical and biological interactions and environmental conditions enable biofilm systems to morph into films, microcolonies and macrocolonies, films, ridges, ripples, columns, pellicles, bubbles, mushrooms and suspended aggregates - in response to the very diverse conditions confronting a particular biofilm community. Assembly and dynamics of the matrix are mostly coordinated by secondary messengers, signalling molecules or small RNAs, in both medically relevant and environmental biofilms. Fully deciphering how bacteria provide structure to the matrix, and thus facilitate and benefit from extracellular reactions, remains the challenge for future biofilm research.
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Affiliation(s)
- Hans-Curt Flemming
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore.
| | | | - Thomas R Neu
- Department of River Ecology, Helmholtz Centre for Environmental Research - UFZ, Magdeburg, Germany
| | - Per H Nielsen
- Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark
| | - Thomas Seviour
- Aarhus University Centre for Water Technology, Department of Biological and Chemical Engineering, Aarhus University, Aarhus, Denmark
| | - Paul Stoodley
- Department of Microbial Infection and Immunity, The Ohio State University, Columbus, OH, USA.,Department of Orthopaedics, The Ohio State University, Columbus, OH, USA
| | - Jost Wingender
- University of Duisburg-Essen, Biofilm Centre, Department of Aquatic Microbiology, Essen, Germany
| | - Stefan Wuertz
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
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17
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Rezaei A, Ehtesabi H, Ebrahimi S. Incorporation of Saqez essential oil into polyvinyl alcohol/chitosan bilayer hydrogel as a potent wound dressing material. Int J Biol Macromol 2023; 226:383-396. [PMID: 36493925 DOI: 10.1016/j.ijbiomac.2022.12.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 10/26/2022] [Accepted: 12/05/2022] [Indexed: 12/12/2022]
Abstract
Nowadays, many studies are conducted on multilayer hydrogels for wound dressing. On the other hand, considering the emergence of bacterial resistance to common antibiotics, studies on the use of natural essential oils and their derivatives that have antibacterial and antioxidant activity can be useful. Herein, a novel bilayer hydrogel developed from polyvinyl alcohol and chitosan with the incorporation of Saqez essential oil (SEO) was synthesized. The results showed a gel-type structure with specific compression and flexibility, while the microscopic images confirmed the formation of a bilayer hydrogel. Further, the data showed that increasing the concentration of SEO reduces the swelling and water vapor permeability and increases the water retention and hydrophobicity of the hydrogel surface. The effects of the combination of SEO in the bilayer hydrogel led to a strong antioxidant property and increased antimicrobial activity. Also, the in vitro results demonstrated that the bilayer hydrogels are biocompatible, non-toxic, and blood compatible. Finally, the results of the in vivo tests showed that these bilayer hydrogels had good homeostatic efficiency. Overall, the obtained results indicate that these bilayer hydrogels are promising candidates for wound dressing.
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Affiliation(s)
- Ali Rezaei
- Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
| | - Hamide Ehtesabi
- Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran.
| | - Somaye Ebrahimi
- Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
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18
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Lazarevic V, Gaïa N, Girard M, Mauffrey F, Ruppé E, Schrenzel J. Effect of bacterial DNA enrichment on detection and quantification of bacteria in an infected tissue model by metagenomic next-generation sequencing. ISME COMMUNICATIONS 2022; 2:122. [PMID: 37938717 PMCID: PMC9792467 DOI: 10.1038/s43705-022-00208-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 12/06/2022] [Accepted: 12/13/2022] [Indexed: 10/28/2023]
Abstract
Before implementing metagenomic next-generation sequencing (mNGS) in the routine diagnostic laboratory, several challenges need to be resolved. To address strengths and limitations of mNGS in bacterial detection and quantification in samples with overwhelming host DNA abundance, we used the pig muscle tissue spiked with a home-made bacterial mock community, consisting of four species from different phyla. From the spiked tissue, we extracted DNA using: (i) a procedure based on mechanical/chemical lysis (no bacterial DNA enrichment); (ii) the Ultra-Deep Microbiome Prep (Molzym) kit for bacterial DNA enrichment; and (iii) the same enrichment kit but replacing the original proteinase K treatment for tissue solubilization by a collagenases/thermolysin digestion and cell filtration. Following mNGS, we determined bacterial: 'host' read ratios and taxonomic abundance profiles. We calculated the load of each mock-community member by combining its read counts with read counts and microscopically-determined cell counts of other co-spiked bacteria. In unenriched samples, bacterial quantification and taxonomic profiling were fairly accurate but at the expense of the sensitivity of detection. The removal of 'host' DNA by the modified enrichment protocol substantially improved bacterial detection in comparison to the other two extraction procedures and generated less distorted taxonomic profiles as compared to the original enrichment protocol.
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Affiliation(s)
- Vladimir Lazarevic
- Genomic Research Laboratory, Division of Infectious Diseases, Department of Medicine, University Hospitals and University of Geneva, Geneva, Switzerland.
| | - Nadia Gaïa
- Genomic Research Laboratory, Division of Infectious Diseases, Department of Medicine, University Hospitals and University of Geneva, Geneva, Switzerland
| | - Myriam Girard
- Genomic Research Laboratory, Division of Infectious Diseases, Department of Medicine, University Hospitals and University of Geneva, Geneva, Switzerland
| | - Florian Mauffrey
- Genomic Research Laboratory, Division of Infectious Diseases, Department of Medicine, University Hospitals and University of Geneva, Geneva, Switzerland
| | - Etienne Ruppé
- Université Sorbonne Paris Nord and INSERM UMR1137 IAME, Université de Paris Cité, Paris, France
- AP-HP, Hôpital Bichat, Laboratoire de Bactériologie, Paris, France
| | - Jacques Schrenzel
- Genomic Research Laboratory, Division of Infectious Diseases, Department of Medicine, University Hospitals and University of Geneva, Geneva, Switzerland
- Bacteriology Laboratory, Division of Laboratory Medicine, Department of Diagnostics, Geneva University Hospitals, Geneva, Switzerland
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19
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Swanson T, Ousey K, Haesler E, Bjarnsholt T, Carville K, Idensohn P, Kalan L, Keast DH, Larsen D, Percival S, Schultz G, Sussman G, Waters N, Weir D. IWII Wound Infection in Clinical Practice consensus document: 2022 update. J Wound Care 2022; 31:S10-S21. [PMID: 36475844 DOI: 10.12968/jowc.2022.31.sup12.s10] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
ABSTRACT Wound infection is a major challenge for clinicians globally, with accurate and timely identification of wound infection being critical to achieving clinical and cost-effective management, and promotion of healing. This paper presents an overview of the development of the International Wound Infection Institute (IWII)'s 2022 Wound Infection in Clinical Practice consensus document. The updated document summarises current evidence and provides multidisciplinary healthcare providers with effective guidance and support on terminology, paradigms related to biofilm, identification of wound infection, wound cleansing, debridement and antimicrobial stewardship. Integral to the update is revision of wound infection management strategies which are incorporated within the IWII's Wound Infection Continuum (IWII-WIC) and management plan. The aim of the 2022 IWII consensus document update was to provide an accessible and useful clinical resource in at least six languages, incorporating the latest evidence and current best practice for wound infection and prevention. Dissemination techniques for the consensus are discussed and highlighted.
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Affiliation(s)
| | - Karen Ousey
- Professor of Skin Integrity, Institute of Skin Integrity and Infection Prevention, University of Huddersfield, UK.,Adjunct Professor, School of Nursing, Queensland University of Technology, Australia.,Visiting Professor, Royal College of Surgeons Ireland, Dublin, Ireland
| | - Emily Haesler
- Adjunct Professor, Curtin Health Innovation Research Institute, Curtin University, Perth, Australia.,Adjunct Associate Professor, Australian Centre for Evidence Based Aged Care, La Trobe University, Melbourne, Australia.,Honorary Senior Lecturer, The Australian National University Medical School, Canberra, Australia
| | - Thomas Bjarnsholt
- Department of Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark
| | - Keryln Carville
- Professor of Primary Health Care, Silver Chain and Curtin Health Innovation Research Institute, Curtin University, Perth, Australia
| | - Patricia Idensohn
- Wound Nurse Specialist, Educator & Consultant in Private Practice, CliniCare, Ballito, South Africa.,Principal Lecturer and Co-Ordinator, School of Nursing, University of the Free State, South Africa
| | - Lindsay Kalan
- Medical Microbiology & Immunology, University of Wisconsin, US
| | - David H Keast
- Parkwood Institute, St Joseph's Healthcare, London, Canada
| | | | - Steven Percival
- Professor (Honorary), University of Liverpool, UK.,CEO and Director, Biofilm Centre, 5D Health Protection Group Ltd, Liverpool, UK
| | - Gregory Schultz
- Emeritus Professor of Obstetrics & Gynecology, University of Florida, US
| | - Geoff Sussman
- Associate Professor of Wound Care, Faculty of Medicine, Nursing and Health Science, Monash University, Australia.,Clinical Lecturer Medical Education, University of Melbourne, Australia
| | - Nicola Waters
- Senior Research Associate, Health, The Conference Board of Canada.,Adjunct Professor, University of British Columbia, Okanagan, Canada
| | - Dot Weir
- Clinician, Saratoga Hospital Center for Wound Healing and Hyperbaric Medicine, Saratoga Springs, New York, US.,Co-chair, Symposium on Advanced Wound Care, US.,Faculty, Wound Certification Prep Course, US
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20
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Dissolvable zinc oxide nanoparticle-loaded wound dressing with preferential exudate absorption and hemostatic features. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-022-04358-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Baines D, Carter M, Pimlott B, Reilly M. Effectiveness of testing hard-to-heal wounds for bacterial protease activity: a randomised clinical trial. J Wound Care 2022; 31:398-405. [PMID: 35579313 DOI: 10.12968/jowc.2022.31.5.398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE The study aimed to evaluate whether using a point-of-care test for bacterial protease activity (BPA) to target antimicrobial dressing use can improve outcomes for hard-to-heal wounds and reduce cost. METHOD Wounds asymptomatic for infection and testing positive for BPA were randomly assigned to two weeks' treatment with a silver antimicrobial dressing in addition to standard of care (SoC) (intervention group) or to SoC only (control group). The patient's outcomes were monitored for 12 weeks. RESULTS The study included 100 wounds. A reduction in annualised nursing resource of 29.0% (95% confidence interval (CI): 1.9-34.1) for hard-to-heal wounds was predicted for the intervention versus control group (44±25.10 intervention group nurse/clinic visits versus 62±31.23 control group nurse/clinic visits; p=0.034). The percentage of patients reporting problems reduced for all EQ5D-3L dimensions for the intervention group, with the largest reductions in 'pain/discomfort' (-36.2%) and 'anxiety/depression' (-19.1%). Prescription of antibiotics fell by 45% for wound-related infections in the intervention group compared with the control group. In the intervention group the number of patients who did not receive a prescription was 37/50 (74%), nine (18%) patients received one prescription and four (8%) patients received two or more prescriptions. In the control group 29/50 (58%) patients did not receive a prescription, 12 (24%) received one prescription and nine (18%) patients received two or more prescriptions; p=0.068. CONCLUSION The utility of the BPA test to reduce predicted annualised nursing time was demonstrated. The strong trend towards reduced antibiotic prescribing and improved quality of life for patients with wounds treated for BPA deserves further study.
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Affiliation(s)
- Deborah Baines
- National Institute for Health Research Clinical Research Network (Greater Manchester), UK
| | | | | | - Mkyla Reilly
- Public Health England North West, Manchester, UK
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22
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Xia G, Li Y, Tao H, Zhang L, Zhang J, Yang H, Mustapha AT, Zhou C. Inactivation mechanism of catalytic infrared against Pseudomonas aeruginosa and its decontamination application on dry green Sichuan pepper (Zanthoxylum schinifolium). Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108483] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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23
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Escobar‐Salom M, Torrens G, Jordana‐Lluch E, Oliver A, Juan C. Mammals' humoral immune proteins and peptides targeting the bacterial envelope: from natural protection to therapeutic applications against multidrug‐resistant
Gram
‐negatives. Biol Rev Camb Philos Soc 2022; 97:1005-1037. [PMID: 35043558 PMCID: PMC9304279 DOI: 10.1111/brv.12830] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 12/12/2021] [Accepted: 12/15/2021] [Indexed: 12/11/2022]
Abstract
Mammalian innate immunity employs several humoral ‘weapons’ that target the bacterial envelope. The threats posed by the multidrug‐resistant ‘ESKAPE’ Gram‐negative pathogens (Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter spp.) are forcing researchers to explore new therapeutic options, including the use of these immune elements. Here we review bacterial envelope‐targeting (peptidoglycan and/or membrane‐targeting) proteins/peptides of the mammalian immune system that are most likely to have therapeutic applications. Firstly we discuss their general features and protective activity against ESKAPE Gram‐negatives in the host. We then gather, integrate, and discuss recent research on experimental therapeutics harnessing their bactericidal power, based on their exogenous administration and also on the discovery of bacterial and/or host targets that improve the performance of this endogenous immunity, as a novel therapeutic concept. We identify weak points and knowledge gaps in current research in this field and suggest areas for future work to obtain successful envelope‐targeting therapeutic options to tackle the challenge of antimicrobial resistance.
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Affiliation(s)
- María Escobar‐Salom
- Department of Microbiology University Hospital Son Espases‐Health Research Institute of the Balearic Islands (IdISBa) Carretera de Valldemossa 79 Palma Balearic Islands 07010 Spain
| | - Gabriel Torrens
- Department of Microbiology University Hospital Son Espases‐Health Research Institute of the Balearic Islands (IdISBa) Carretera de Valldemossa 79 Palma Balearic Islands 07010 Spain
| | - Elena Jordana‐Lluch
- Department of Microbiology University Hospital Son Espases‐Health Research Institute of the Balearic Islands (IdISBa) Carretera de Valldemossa 79 Palma Balearic Islands 07010 Spain
| | - Antonio Oliver
- Department of Microbiology University Hospital Son Espases‐Health Research Institute of the Balearic Islands (IdISBa) Carretera de Valldemossa 79 Palma Balearic Islands 07010 Spain
| | - Carlos Juan
- Department of Microbiology University Hospital Son Espases‐Health Research Institute of the Balearic Islands (IdISBa) Carretera de Valldemossa 79 Palma Balearic Islands 07010 Spain
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Averay K, Ward M, Verwilghen D. Perforations of tri-layer nitrile-latex and natural rubber latex gloves during ex-vivo equine intestinal anastomoses. Vet Surg 2021; 50:1250-1256. [PMID: 34213773 DOI: 10.1111/vsu.13635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 02/25/2021] [Accepted: 03/24/2021] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To compare perforation rates between tri-layer nitrile-latex and natural rubber latex surgical gloves after single-layer end-to-end jejunojejunal anastomoses in equine cadavers. STUDY DESIGN Prospective randomized ex-vivo study. SAMPLE POPULATION Pairs of surgical gloves (n = 46) worn during jejunojejunal anastomoses. METHODS Tri-layer nitrile-latex and rubber latex pairs of gloves were equally but randomly allocated to a right-handed surgeon performing 46 single-layer end-to-end jejunojejunal anastomoses on cadaveric material. Number and location of perforations were determined with the water leak test after each procedure. Ten unused pairs of both glove types were tested as controls. RESULTS At least one perforation occurred in 41% (19/46) of the pairs of gloves. Glove perforations were present in 22% (5/23; 95% CI: 9-42) of tri-layer glove pairs and 61% (14/23; 95% CI: 41-78) of the rubber glove pairs. The odds of glove perforation were 5.6 times (p = .009, 95% CI: 1.5-20.5) lower when tri-layer rather than rubber gloves were used. The duration of procedure did not affect the risk of glove perforation (p = .679). No perforations were observed in the unused gloves. CONCLUSION Perforations were less common when the surgeon wore tri-layer nitrile-latex gloves rather than to the natural rubber latex gloves tested in this study. CLINICAL RELEVANCE Tri-layer nitrile-latex gloves were more resistant to perforations in experimental settings; further studies may confirm that they are also superior in a clinical setting.
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Affiliation(s)
- Kate Averay
- Camden Equine Centre, Sydney School of Veterinary Science, University of Sydney, Sydney, New South Wales, Australia
| | - Michael Ward
- Sydney School of Veterinary Science, University of Sydney, Sydney, New South Wales, Australia
| | - Denis Verwilghen
- Camden Equine Centre, Sydney School of Veterinary Science, University of Sydney, Sydney, New South Wales, Australia
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25
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Saul-McBeth J, Dillon J, Lee A, Launder D, Kratch JM, Abutaha E, Williamson AA, Schroering AG, Michalski G, Biswas P, Conti SR, Shetty AC, McCracken C, Bruno VM, Parsai EI, Conti HR. Tissue Damage in Radiation-Induced Oral Mucositis Is Mitigated by IL-17 Receptor Signaling. Front Immunol 2021; 12:687627. [PMID: 34220843 PMCID: PMC8248500 DOI: 10.3389/fimmu.2021.687627] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/31/2021] [Indexed: 01/13/2023] Open
Abstract
Oral mucositis (OM) is a treatment-limiting adverse side effect of radiation and chemotherapy. Approximately 80% of patients undergoing radiotherapy (RT) for head and neck cancers (HNC) develop OM, representing a major unmet medical condition. Our understanding of the immunopathogenesis of OM is limited, due in part to the surprising paucity of information regarding healing mechanisms in the oral mucosa. RNAseq of oral tissue in a murine model that closely mimics human OM, showed elevated expression of IL-17 and related immune pathways in response to head and neck irradiation (HNI). Strikingly, mice lacking the IL-17 receptor (IL-17RA) exhibited markedly more severe OM. Restoration of the oral mucosa was compromised in Il17ra-/- mice and components associated with healing, including matrix metalloproteinase 3, 10 and IL-24 were diminished. IL-17 is typically associated with recruitment of neutrophils to mucosal sites following oral infections. Unexpectedly, in OM the absence of IL-17RA resulted in excessive neutrophil recruitment and immunopathology. Instead, neutrophil activation was IL-1R-driven in Il17ra-/- mice. Blockade of IL-1R and depletion of neutrophils lessened the severity of damage in these mice. Overall, we show IL-17 is protective in OM through multiple mechanisms including restoration of the damaged epithelia and control of the neutrophil response. We also present a clinically relevant murine model of human OM to improve mechanistic understanding and develop rational translational therapeutics.
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Affiliation(s)
- Jessica Saul-McBeth
- Department of Biological Sciences, University of Toledo, Toledo, OH, United States
| | - John Dillon
- Department of Biological Sciences, University of Toledo, Toledo, OH, United States
| | - Aaron Lee
- Department of Radiation Oncology, Division of Medical Physics, The University of Toledo, Toledo, OH, United States
| | - Dylan Launder
- Department of Biological Sciences, University of Toledo, Toledo, OH, United States
| | - Jacqueline M. Kratch
- Department of Biological Sciences, University of Toledo, Toledo, OH, United States
| | - Eanas Abutaha
- Department of Biological Sciences, University of Toledo, Toledo, OH, United States
| | | | | | - Grace Michalski
- Department of Biological Sciences, University of Toledo, Toledo, OH, United States
| | - Priosmita Biswas
- Department of Biological Sciences, University of Toledo, Toledo, OH, United States
| | - Samuel R. Conti
- Department of Biological Sciences, University of Toledo, Toledo, OH, United States
| | - Amol C. Shetty
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Carrie McCracken
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Vincent M. Bruno
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, United States
| | - E. Ishmael Parsai
- Department of Radiation Oncology, Division of Medical Physics, The University of Toledo, Toledo, OH, United States
| | - Heather R. Conti
- Department of Biological Sciences, University of Toledo, Toledo, OH, United States
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Transient surface hydration impacts biogeography and intercellular interactions of non-motile bacteria. Appl Environ Microbiol 2021; 87:AEM.03067-20. [PMID: 33579687 PMCID: PMC8091113 DOI: 10.1128/aem.03067-20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
There are many hydrated surface niches that are neither static nor continuously flowing that are colonized by microbes such as bacteria. Such periodic hydrodynamic regimes are distinct from aquatic systems where microbial dissemination is reasonably predicted by assuming continuous flow or static systems where motile microbes largely control their own fate. Here we show how non-motile bacteria exhibit rapid, dispersive bursts of movement over surfaces using transient confluent hydration from the environment, which we term "surface hydrodispersion" where cells traverse thousands of cell lengths within minutes. The fraction of the population disseminated by surface hydrodispersion is small-on order of 1 cell per million. Thus, surface hydrodispersion can promote isolated distribution of single cells, which is unlike other characterized active and passive surface motilities. We describe this translocation using a continuous time random walk modeling approach and find in computational simulations that transient fluid accumulation, dilution, and gravitational pull are the contributing factors. Surface hydrodispersion, consistent with advection, is unlike simple colony expansion as it dramatically alters spatial relationships, shown here with Staphylococcus aureus, which becomes increasingly virulent when isolated from Corynebacterium striatum Surface hydrodispersion of non-motile bacteria exploiting transient fluid availability and gravity is a mechanism that can result in sporadic and sudden shifts in microbial community behavior. To better understand how this movement can impact biogeography on the millimeter scale, this work describes a system for study of primary factors behind this movement as well as a stochastic model describing this dispersal.Importance: Understanding the dynamics within microbiome communities is a challenge. Knowledge of phylogeny and spatial arrangement has led to increased understanding of numerous polymicrobial communities yet, these snapshots do not convey the dynamics of populations over time. The actual biogeography of any microbiome controls the potential interactions, governing any possible antagonistic or synergistic behavior. Accordingly, a shift in biogeography can enable new behavior. Little is known about the movement mechanisms of "non-motile" microbes. Here we characterize a universal means of movement we term hydrodispersion where non-motile bacteria are transported thousands of cell lengths in minutes. We show that only a small fraction of the population is translocated by hydrodispersion and describe this movement further using a random-walk mathematical model approach in silico We demonstrate the importance of hydrodispersion by showing that Staphylococcus aureus can separate from a coculture inoculation with Corynebacterium striatum thus permitting transition to a more virulent state.
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27
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D’Souza AR, Necelis MR, Kulesha A, Caputo GA, Makhlynets OV. Beneficial Impacts of Incorporating the Non-Natural Amino Acid Azulenyl-Alanine into the Trp-Rich Antimicrobial Peptide buCATHL4B. Biomolecules 2021; 11:421. [PMID: 33809374 PMCID: PMC8001250 DOI: 10.3390/biom11030421] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 03/01/2021] [Accepted: 03/09/2021] [Indexed: 12/15/2022] Open
Abstract
Antimicrobial peptides (AMPs) present a promising scaffold for the development of potent antimicrobial agents. Substitution of tryptophan by non-natural amino acid Azulenyl-Alanine (AzAla) would allow studying the mechanism of action of AMPs by using unique properties of this amino acid, such as ability to be excited separately from tryptophan in a multi-Trp AMPs and environmental insensitivity. In this work, we investigate the effect of Trp→AzAla substitution in antimicrobial peptide buCATHL4B (contains three Trp side chains). We found that antimicrobial and bactericidal activity of the original peptide was preserved, while cytocompatibility with human cells and proteolytic stability was improved. We envision that AzAla will find applications as a tool for studies of the mechanism of action of AMPs. In addition, incorporation of this non-natural amino acid into AMP sequences could enhance their application properties.
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Affiliation(s)
- Areetha R. D’Souza
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA; (A.R.D.); (A.K.)
| | - Matthew R. Necelis
- Department of Chemistry & Biochemistry, Rowan University, Glassboro, NJ 08028, USA; (M.R.N.); (G.A.C.)
| | - Alona Kulesha
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA; (A.R.D.); (A.K.)
| | - Gregory A. Caputo
- Department of Chemistry & Biochemistry, Rowan University, Glassboro, NJ 08028, USA; (M.R.N.); (G.A.C.)
- Department of Molecular & Cellular Biosciences, Rowan University, Glassboro, NJ 08028, USA
| | - Olga V. Makhlynets
- Department of Chemistry, Syracuse University, 111 College Place, Syracuse, NY 13244, USA; (A.R.D.); (A.K.)
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28
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Zheng L, Li S, Luo J, Wang X. Latest Advances on Bacterial Cellulose-Based Antibacterial Materials as Wound Dressings. Front Bioeng Biotechnol 2020; 8:593768. [PMID: 33330424 PMCID: PMC7732461 DOI: 10.3389/fbioe.2020.593768] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 10/27/2020] [Indexed: 12/17/2022] Open
Abstract
At present, there are various wound dressings that can protect the wound from further injury or isolate the external environment in wound treatment. Whereas, infection and slow self-healing still exist in wound healing process. Therefore, it is urgent to develop an ideal wound dressing with good biocompatibility and strong antibacterial activity to promote wound healing. Bacterial cellulose is a kind of promising biopolymer because it can control wound exudate and provide a moist environment for wound healing. However, the lack of antibacterial activity limits its application. In this paper, the advantages of bacterial cellulose as wound dressings were introduced, and the preparation and research progress of bacterial cellulose-based antibacterial composites in recent years were reviewed, including adding antibiotics, combining with inorganic antibacterial agents or organic antibacterial agents. Finally, the existing problems and future development direction of bacterial cellulose-based antibacterial wound dressings were discussed.
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Affiliation(s)
- Lu Zheng
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China
| | - Shanshan Li
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China
| | - Jiwen Luo
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou, China
| | - Xiaoying Wang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China
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29
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Paolillo FR, Rodrigues PGS, Bagnato VS, Alves F, Pires L, Corazza AV. The effect of combined curcumin-mediated photodynamic therapy and artificial skin on Staphylococcus aureus-infected wounds in rats. Lasers Med Sci 2020; 36:1219-1226. [PMID: 33064262 DOI: 10.1007/s10103-020-03160-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 10/12/2020] [Indexed: 10/23/2022]
Abstract
Healing wounds represent a major public health problem, mainly when it is infected. Besides that, the antibiotics misuse and overuse favor the development of bacterial resistance. This study evaluated the effects of antimicrobial photodynamic therapy (aPDT) combined with artificial skin on disinfection of infected skin wound in rats. Twenty-four Wistar rats were randomly distributed into 4 groups (n = 6): (i) control-untreated; (ii) aPDT-treated with curcumin-mediated aPDT (blue light); (iii) artificial skin-treated with artificial skin alcohol-based; and (iv) aPDT plus artificial skin-treated with aPDT associated with artificial skin alcohol-based. For the in vivo model, a full-thickness biopsy with 0.80 cm was performed in order to inoculate the microorganism Staphylococcus aureus (ATCC 25923). The aPDT was performed with a curcumin gel and a blue LED light (450 nm, 80 mW/cm2) at the dose of 60 J/cm2 and the treatment with alcohol-based artificial skin was done with the topical application of 250 μL. Additional animals were submitted to aPDT combined with the artificial skin. After treatments, the number of colony-forming units (CFU) and the damage area were determined. Data were analyzed by two-way repeated measures ANOVA and Tukey tests. The highest reduction of the bacterial viability was observed in the PDT plus artificial skin group (4.14 log10), followed by artificial skin (2.38 log10) and PDT (2.22 log10) groups. In addition, all treated groups showed higher relative area of wound contraction (36.21% for the PDT, 38.41% for artificial skin, and 35.02% for PDT plus artificial) in comparison with the control group. These findings provide evidence for the positive benefits of aPDT with blue light and curcumin associated with artificial skin to decontaminate and accelerate the wound contraction.
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Affiliation(s)
- Fernanda Rossi Paolillo
- School of Physical Education, State University of Minas Gerais (UEMG), R. Colorado, 700 - Bairro São Francisco, Passos, MG, CEP 37902-092, Brazil. .,Motricity Science Institute, Rehabilitation Science Program from Federal University of Alfenas (UNIFAL), Av. Jovino Fernandes Sales, 2600 - Santa Clara, Alfenas, MG, CEP: 37133-840, Brazil. .,Optics Group from Physics Institute of São Carlos (IFSC), University of São Paulo (USP), Av. Trabalhador Sãocarlense, 400 - Centro, São Carlos, SP, CEP 13560-970, Brazil.
| | - Phamilla Gracielli Sousa Rodrigues
- Optics Group from Physics Institute of São Carlos (IFSC), University of São Paulo (USP), Av. Trabalhador Sãocarlense, 400 - Centro, São Carlos, SP, CEP 13560-970, Brazil
| | - Vanderlei Salvador Bagnato
- Optics Group from Physics Institute of São Carlos (IFSC), University of São Paulo (USP), Av. Trabalhador Sãocarlense, 400 - Centro, São Carlos, SP, CEP 13560-970, Brazil
| | - Fernanda Alves
- Optics Group from Physics Institute of São Carlos (IFSC), University of São Paulo (USP), Av. Trabalhador Sãocarlense, 400 - Centro, São Carlos, SP, CEP 13560-970, Brazil
| | - Layla Pires
- Latner Thoracic Surgery Research Laboratories, Toronto General Research Institute, University Health Network, Toronto, ON, M5G 2C4, Canada
| | - Adalberto Vieira Corazza
- Medical School, Federal University of Mato Grosso do Sul, Cap. Olinto Mancini Avenue, 1662 - Colinos, Três Lagoas, MS, CEP 79600-080, Brazil
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Schilcher K, Horswill AR. Staphylococcal Biofilm Development: Structure, Regulation, and Treatment Strategies. Microbiol Mol Biol Rev 2020; 84:e00026-19. [PMID: 32792334 PMCID: PMC7430342 DOI: 10.1128/mmbr.00026-19] [Citation(s) in RCA: 307] [Impact Index Per Article: 76.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
In many natural and clinical settings, bacteria are associated with some type of biotic or abiotic surface that enables them to form biofilms, a multicellular lifestyle with bacteria embedded in an extracellular matrix. Staphylococcus aureus and Staphylococcus epidermidis, the most frequent causes of biofilm-associated infections on indwelling medical devices, can switch between an existence as single free-floating cells and multicellular biofilms. During biofilm formation, cells first attach to a surface and then multiply to form microcolonies. They subsequently produce the extracellular matrix, a hallmark of biofilm formation, which consists of polysaccharides, proteins, and extracellular DNA. After biofilm maturation into three-dimensional structures, the biofilm community undergoes a disassembly process that leads to the dissemination of staphylococcal cells. As biofilms are dynamic and complex biological systems, staphylococci have evolved a vast network of regulatory mechanisms to modify and fine-tune biofilm development upon changes in environmental conditions. Thus, biofilm formation is used as a strategy for survival and persistence in the human host and can serve as a reservoir for spreading to new infection sites. Moreover, staphylococcal biofilms provide enhanced resilience toward antibiotics and the immune response and impose remarkable therapeutic challenges in clinics worldwide. This review provides an overview and an updated perspective on staphylococcal biofilms, describing the characteristic features of biofilm formation, the structural and functional properties of the biofilm matrix, and the most important mechanisms involved in the regulation of staphylococcal biofilm formation. Finally, we highlight promising strategies and technologies, including multitargeted or combinational therapies, to eradicate staphylococcal biofilms.
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Affiliation(s)
- Katrin Schilcher
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Alexander R Horswill
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, Colorado, USA
- Department of Veterans Affairs Eastern Colorado Health Care System, Denver, Colorado, USA
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31
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Schilcher K, Horswill AR. Staphylococcal Biofilm Development: Structure, Regulation, and Treatment Strategies. Microbiol Mol Biol Rev 2020. [PMID: 32792334 DOI: 10.1128/mmbr.00026-19/asset/e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2023] Open
Abstract
In many natural and clinical settings, bacteria are associated with some type of biotic or abiotic surface that enables them to form biofilms, a multicellular lifestyle with bacteria embedded in an extracellular matrix. Staphylococcus aureus and Staphylococcus epidermidis, the most frequent causes of biofilm-associated infections on indwelling medical devices, can switch between an existence as single free-floating cells and multicellular biofilms. During biofilm formation, cells first attach to a surface and then multiply to form microcolonies. They subsequently produce the extracellular matrix, a hallmark of biofilm formation, which consists of polysaccharides, proteins, and extracellular DNA. After biofilm maturation into three-dimensional structures, the biofilm community undergoes a disassembly process that leads to the dissemination of staphylococcal cells. As biofilms are dynamic and complex biological systems, staphylococci have evolved a vast network of regulatory mechanisms to modify and fine-tune biofilm development upon changes in environmental conditions. Thus, biofilm formation is used as a strategy for survival and persistence in the human host and can serve as a reservoir for spreading to new infection sites. Moreover, staphylococcal biofilms provide enhanced resilience toward antibiotics and the immune response and impose remarkable therapeutic challenges in clinics worldwide. This review provides an overview and an updated perspective on staphylococcal biofilms, describing the characteristic features of biofilm formation, the structural and functional properties of the biofilm matrix, and the most important mechanisms involved in the regulation of staphylococcal biofilm formation. Finally, we highlight promising strategies and technologies, including multitargeted or combinational therapies, to eradicate staphylococcal biofilms.
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Affiliation(s)
- Katrin Schilcher
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, Colorado, USA
| | - Alexander R Horswill
- Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, Colorado, USA
- Department of Veterans Affairs Eastern Colorado Health Care System, Denver, Colorado, USA
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32
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Mielko KA, Jabłoński SJ, Wojtowicz W, Milczewska J, Sands D, Łukaszewicz M, Młynarz P. Possible metabolic switch between environmental and pathogenic Pseudomonas aeruginosa strains: 1H NMR based metabolomics study. J Pharm Biomed Anal 2020; 188:113369. [PMID: 32534405 DOI: 10.1016/j.jpba.2020.113369] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 05/11/2020] [Accepted: 05/14/2020] [Indexed: 10/24/2022]
Abstract
The study aimed to assess whether Pseudomonas aeruginosa strains from different sources can be distinguished by the metabolomic fingerprint and to check whether antibiotic susceptibility distinctions are available through metabolomic analysis. 1H NMR spectroscopy analysis of the bacteria metabolites was performed. Twenty-nine strains were tested (18 isolated form cystic fibrosis patients and 11 environmental). Thirty-one metabolites were identified, 12 were up-regulated in strains from CF patients, while 2 were higher level in strains from the environment. Changed carbohydrate catabolic metabolism and the metabolic shift toward the utilization of amino acids is suggested in strains from CF patients.
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Affiliation(s)
- Karolina Anna Mielko
- Department of Biochemistry, Molecular Biology and Biotechnology, Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Sławomir Jan Jabłoński
- Biotransformation Department, University of Wroclaw, Plac Uniwersytecki 1, 50-137 Wrocław Poland
| | - Wojciech Wojtowicz
- Department of Biochemistry, Molecular Biology and Biotechnology, Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Justyna Milczewska
- Cystic Fibrosis Department, Institute of Mother and Child, Kasprzaka 17a, 01-211 Warszawa, Poland
| | - Dorota Sands
- Cystic Fibrosis Department, Institute of Mother and Child, Kasprzaka 17a, 01-211 Warszawa, Poland
| | - Marcin Łukaszewicz
- Biotransformation Department, University of Wroclaw, Plac Uniwersytecki 1, 50-137 Wrocław Poland
| | - Piotr Młynarz
- Department of Biochemistry, Molecular Biology and Biotechnology, Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland.
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Thapa RK, Kiick KL, Sullivan MO. Encapsulation of collagen mimetic peptide-tethered vancomycin liposomes in collagen-based scaffolds for infection control in wounds. Acta Biomater 2020; 103:115-128. [PMID: 31843720 PMCID: PMC7044801 DOI: 10.1016/j.actbio.2019.12.014] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 11/26/2019] [Accepted: 12/10/2019] [Indexed: 12/13/2022]
Abstract
Wound infections are a significant clinical problem affecting millions of people worldwide. Topically applied antibacterial formulations with longer residence time and controlled antimicrobial release would offer significant benefits for improved prevention and treatment of infected wounds. In this study, we developed collagen mimetic peptide (CMP) tethered vancomycin (Van)-containing liposomes (Lipo) (CMP-Van-Lipo) hybridized to collagen-based hydrogels ('co-gels,' e.g., collagen/fibrin combination hydrogels) for the treatment of methicillin-resistant Staphylococcus aureus (MRSA) infections in vitro and in vivo. Tethering CMP-Van-Lipo nanostructures to co-gels enabled sustained Van release and enhanced in vitro antibacterial effects against MRSA as compared to Van loaded co-gels or Van-Lipo loaded co-gels following multiple fresh bacterial inoculations over a period of 48 h. These results were successfully translated in vivo wherein MRSA infected wounds were effectively treated with CMP-Van-Lipo loaded co-gels for up to 9 days, whereas the activity of Van loaded co-gels and Van-Lipo loaded co-gels were limited to <2 days. Moreover, CMP-Van-Lipo retained in vivo antibacterial activity even after re-inoculation with bacteria; however, Van loaded co-gels and Van-Lipo loaded co-gels allowed significant bacterial growth demonstrating their limited efficacy. Altogether, these results provide proof-of-concept that CMP-Van-Lipo loaded co-gels can be effective topical formulations for preventive treatment of MRSA wound infections. STATEMENT OF SIGNIFICANCE: Current topical antimicrobial formulations (e.g., creams, gels, and ointments) do not control release, leaving antimicrobial concentrations either too high or too low at different time points, and provoking the development of antibacterial resistance and recurrence of wound infections. Here, collagen mimetic peptides (CMPs) were used to stably hybridize vancomycin-containing liposomal nanocarriers (CMP-Van-Lipo) within collagen-fibrin co-gels via triple-helical integration with collagen, enabling control over Van release for prolonged time periods and minimizing the adverse effects of the Lipo formulations on fibroblast cell viability in the wound bed. The CMP-Van-Lipo loaded co-gel's higher antibacterial effects in vitro were successfully translated in vivo for treatment of MRSA-infected mouse wounds, and thus the co-gels can be a potentially translatable treatment for improved clinical wound management.
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Affiliation(s)
- Raj Kumar Thapa
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE 19716 USA
| | - Kristi L Kiick
- Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716 USA.
| | - Millicent O Sullivan
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE 19716 USA.
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Neff JA, Bayramov DF, Patel EA, Miao J. Novel Antimicrobial Peptides Formulated in Chitosan Matrices are Effective Against Biofilms of Multidrug-Resistant Wound Pathogens. Mil Med 2020; 185:637-643. [PMID: 32074338 PMCID: PMC7029774 DOI: 10.1093/milmed/usz222] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
INTRODUCTION Infection frequently complicates the treatment of combat-related wounds, impairs healing, and leads to worse outcomes. To better manage wound infections, antimicrobial therapies that are effective against biofilm and designed for direct wound application are needed. The primary objective of this work was to evaluate a chitosan matrix for delivery of two engineered antimicrobial peptides, (ASP)-1 and ASP-2, to treat biofilm-associated bacteria. A secondary objective was to determine whether replacing the levorotatory (L) form amino acids in ASP-2 with dextrorotatory (D) form amino acids would impact peptide activity. MATERIALS AND METHODS Chitosan gels loaded with antimicrobial peptides were evaluated for peptide release over 7 days and tested for efficacy against biofilms grown both in vitro on polymer mesh and ex vivo on porcine skin. RESULTS When delivered via chitosan, 70% to 80% of peptides were released over 7 days. Gels eradicated biofilms of gram-positive and gram-negative, drug-resistant bacteria in vitro and ex vivo. Under the conditions tested, no meaningful differences in peptide activity between the L and D forms of ASP-2 were detected. CONCLUSIONS Chitosan serves as an effective delivery platform for ASP-1 and ASP-2 to treat biofilm-embedded bacteria and warrants further development as a topical treatment.
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Affiliation(s)
- Jennifer A Neff
- Allvivo Vascular, Inc., 20914 Bake Parkway, Suite 100, Lake Forest, CA 92630
| | - Danir F Bayramov
- Allvivo Vascular, Inc., 20914 Bake Parkway, Suite 100, Lake Forest, CA 92630
| | - Esha A Patel
- Allvivo Vascular, Inc., 20914 Bake Parkway, Suite 100, Lake Forest, CA 92630
| | - Jing Miao
- Allvivo Vascular, Inc., 20914 Bake Parkway, Suite 100, Lake Forest, CA 92630
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Meimeti E, Tentolouris N, Manes C, Loupa C, Provatopoulou X, Mostratos D, Vitsos A, Roussis V, Tzouvelekis L, Miriagou V, Rallis M. Ointments containing
Ceratothoa oestroides
extract: Evaluation of their healing potential in the treatment of diabetic foot ulcers. Wound Repair Regen 2019; 28:234-241. [DOI: 10.1111/wrr.12771] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 09/10/2019] [Accepted: 09/12/2019] [Indexed: 01/13/2023]
Affiliation(s)
- Evangelia Meimeti
- Faculty of Pharmacy, Department of Pharmaceutical Technology, Panepistimiopolis ZografouNational and Kapodistrian University of Athens Athens Greece
| | - Nikolaos Tentolouris
- National and Kapodistrian University of Athens, 1st Department of Propaedeutic Internal MedicineMedical School, Laiko General Hospital Athens Greece
| | - Christos Manes
- Diabetic Foot DepartmentGeneral Hospital of Thessaloniki Papageorgiou Thessaloniki Greece
| | - Chariclia Loupa
- Demetrios Voyatzoglou Diabetic Foot ClinicA. Fleming Hospital Athens Greece
| | - Xeni Provatopoulou
- Faculty of Pharmacy, Department of Pharmaceutical Technology, Panepistimiopolis ZografouNational and Kapodistrian University of Athens Athens Greece
| | - Dimitrios Mostratos
- Faculty of Pharmacy, Department of Pharmaceutical Technology, Panepistimiopolis ZografouNational and Kapodistrian University of Athens Athens Greece
| | - Andreas Vitsos
- Faculty of Pharmacy, Department of Pharmaceutical Technology, Panepistimiopolis ZografouNational and Kapodistrian University of Athens Athens Greece
| | - Vassilios Roussis
- Department of Pharmacy, Section of Pharmacognosy and Chemistry of Natural Products, Panepistimiopolis ZografouNational and Kapodistrian University of Athens Athens Greece
| | - Leonidas Tzouvelekis
- National and Kapodistrian University of Athens, Department of MicrobiologyMedical School, University of Athens Athens Greece
| | - Vivi Miriagou
- Laboratory of BacteriologyHellenic Pasteur Institute Athens Greece
| | - Michail Rallis
- Faculty of Pharmacy, Department of Pharmaceutical Technology, Panepistimiopolis ZografouNational and Kapodistrian University of Athens Athens Greece
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Abstract
Regarded as a silent epidemic, chronic wounds are a global public health issue. Wound healing is a complex, synchronized cascade of physiological processes restoring the anatomic and functional integrity of the skin; however, chronic wounds fail to proceed through the wound healing cascade. Wound pH oscillates during wound healing, usually traversing from a neutral pH to an acidic pH, while chronic wounds perpetuate in an elevated alkaline milieu. Although a neglected clinical parameter, pH has implications for relatively all pathologies of wound healing affecting oxygen release, angiogenesis, protease activity, bacterial toxicity and antimicrobial activity. Despite the array of wound healing products currently marketed, understanding the implications of pH on arresting wound healing can stimulate innovation within this vast market.
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Dai L, Wu TQ, Xiong YS, Ni HB, Ding Y, Zhang WC, Chu SP, Ju SQ, Yu J. Ibuprofen-mediated potential inhibition of biofilm development and quorum sensing in Pseudomonas aeruginosa. Life Sci 2019; 237:116947. [PMID: 31605708 DOI: 10.1016/j.lfs.2019.116947] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Revised: 09/28/2019] [Accepted: 10/08/2019] [Indexed: 01/01/2023]
Abstract
AIMS Pseudomonas aeruginosa is one of the leading causes of opportunistic and hospital-acquired infections worldwide, which is frequently linked with clinical treatment difficulties. Ibuprofen, a widely used non-steroidal anti-inflammatory drug, has been previously reported to exert antimicrobial activity with the specific mechanism. We hypothesized that inhibition of P. aeruginosa with ibuprofen is involved in the quorum sensing (QS) systems. MAIN METHODS CFU was utilized to assessed the growth condition of P. aeruginosa. Crystal violent staining and acridine orange staining was used to evaluate the biofilm formation and adherence activity. The detection of QS virulence factors such as pyocyanin, elastase, protease, and rhamnolipids were applied to investigation the anti-QS activity of ibuprofen against P. aeruginosa. The production of 3-oxo-C12-HSL and C4-HSL was confirmed by liquid chromatography/mass spectrometry analysis. qRT-PCR was used to identify the QS-related gene expression. Furthermore, we explored the binding effects between ibuprofen and QS-associated proteins with molecular docking. KEY FINDINGS Ibuprofen inhibits P. aeruginosa biofilm formation and adherence activity. And the inhibitory effects of ibuprofen on C4-HSL levels were concentration-dependent (p < 0.05), while it has no effect on 3-oxo-C12-HSL. Moreover, ibuprofen attenuates the production of virulence factors in P. aeruginosa (p < 0.05). In addition, the genes of QS system were decreased after the ibuprofen treatment (p < 0.05). Of note, ibuprofen was binding with LuxR, LasR, LasI, and RhlR at high binding scores. SIGNIFICANCE The antibiofilm and anti-QS activity of ibuprofen suggest that it can be a candidate drug for the treatment of clinical infections with P. aeruginosa.
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Affiliation(s)
- Lu Dai
- Department of Laboratory Medicine, Affiliated Hospital of Nantong University, 20 Xi Si Road, Nantong, 226001, PR China; Department of Laboratory Medicine, Kunshan affiliated Hospital of Nanjing University of Chinese Medicine, 189 Chao Yang Road, Kunshan, 215300, PR China
| | - Tian-Qi Wu
- Glenelg Country School, 12793 Folly Quarter Rd, Ellicott City, MD, 21042, USA
| | - Yi-Song Xiong
- Department of Laboratory Medicine, Chengdu Military General Hospital, 270 Tian Hui Road, Chengdu, 610000, PR China
| | - Hong-Bing Ni
- Department of Business and External Cooperation, Affiliated Hospital of Nantong University, 20 Xi Si Road, Nantong, 226001, PR China
| | - Ye Ding
- Department of Laboratory Medicine, Affiliated Hospital of Nantong University, 20 Xi Si Road, Nantong, 226001, PR China
| | - Wen-Chen Zhang
- Department of Clinical Laboratory, Wuxi Children's Hospita, No. 299 at Qingyang Road, Wuxi, 214023, PR China
| | - Shao-Peng Chu
- Department of Laboratory Medicine, Affiliated Hospital of Nantong University, 20 Xi Si Road, Nantong, 226001, PR China
| | - Shao-Qing Ju
- Department of Laboratory Medicine, Affiliated Hospital of Nantong University, 20 Xi Si Road, Nantong, 226001, PR China
| | - Juan Yu
- Department of Laboratory Medicine, Affiliated Hospital of Nantong University, 20 Xi Si Road, Nantong, 226001, PR China; Insitute of Public Health, Nantong University, 9 Se Yuan Road, Nantong, 226001, PR China.
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Dai F, Huang J, Liao W, Li D, Wu Y, Huang J, Long Y, Yuan M, Xiang W, Tao F, Cheng Y, Deng H. Chitosan-TiO 2 microparticles LBL immobilized nanofibrous mats via electrospraying for antibacterial applications. Int J Biol Macromol 2019; 135:233-239. [PMID: 31128182 DOI: 10.1016/j.ijbiomac.2019.05.145] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 05/09/2019] [Accepted: 05/21/2019] [Indexed: 12/18/2022]
Abstract
The antibacterial materials with biodegradable and biocompatible nature have unveiled novel prospects to combat the bacterial infection, which has always been a troubling and challenging issue in the biomedical field. In this study, chitosan (CS) and Titanium dioxide (TiO2) microparticles were well immobilized on polylactic acid (PLA) mats by electrospinning-electrospraying hybrid technique. The surface morphology, chemical composition and characteristic group of the mats were characterized. The results indicated that CS/TiO2 microparticles were successfully immobilized on the surface of PLA mats. In addition, the antibacterial activity and cytotoxicity of the composite mats were investigated to confirm that the layer-by-layer immobilization of CS/TiO2 microparticles via electrospraying could enhance the antibacterial effect and biocompatibility of the mats. At the same time, the PLA-(CS/TiO2-1.5%)1.5 mats exhibited the best performance in antibacterial effect (up to about 95%) and cell viability (nearly 92% and 95% at 3 d and 5 d). The composite mats have great potential as an effective antibacterial material for the biomedical applications.
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Affiliation(s)
- Fangfang Dai
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, China; Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Hubei Key Laboratory of Biomass Resource Chemistry and Environmental Biotechnology, School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China
| | - Jin Huang
- Division of Energy & Environment Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
| | - Wenling Liao
- Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Hubei Key Laboratory of Biomass Resource Chemistry and Environmental Biotechnology, School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China
| | - Dan Li
- Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Hubei Key Laboratory of Biomass Resource Chemistry and Environmental Biotechnology, School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China
| | - Yang Wu
- Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Hubei Key Laboratory of Biomass Resource Chemistry and Environmental Biotechnology, School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China
| | - Jing Huang
- Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Hubei Key Laboratory of Biomass Resource Chemistry and Environmental Biotechnology, School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China
| | - Youmei Long
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, China
| | - Mengqin Yuan
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, China
| | - Wei Xiang
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan University, Wuhan 430060, China
| | - Fenghua Tao
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan University, Wuhan 430060, China.
| | - Yanxiang Cheng
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, China.
| | - Hongbing Deng
- Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Hubei Key Laboratory of Biomass Resource Chemistry and Environmental Biotechnology, School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China
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