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Dos Santos LA, Cayô R, Valiatti TB, Gales AC, de Araújo LFB, Rodrigues FM, de Carvalho TS, Vaz MAB, Campanharo M. Biodiversity of carbapenem-resistant bacteria in clinical samples from the Southwest Amazon region (Rondônia/Brazil). Sci Rep 2024; 14:9383. [PMID: 38654061 DOI: 10.1038/s41598-024-59733-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 04/15/2024] [Indexed: 04/25/2024] Open
Abstract
Brazil is recognized for its biodiversity and the genetic variability of its organisms. This genetic variability becomes even more valuable when it is properly documented and accessible. Understanding bacterial diversity through molecular characterization is necessary as it can improve patient treatment, reduce the length of hospital stays and the selection of resistant bacteria, and generate data for health and epidemiological surveillance. In this sense, in this study, we aimed to understand the biodiversity and molecular epidemiology of carbapenem-resistant bacteria in clinical samples recovered in the state of Rondônia, located in the Southwest Amazon region. Retrospective data from the Central Public Health Laboratories (LACEN/RO) between 2018 and 2021 were analysed using the Laboratory Environment Manager Platform (GAL). Seventy-two species with carbapenem resistance profiles were identified, of which 25 species carried at least one gene encoding carbapenemases of classes A (blaKPC-like), B (blaNDM-like, blaSPM-like or blaVIM-like) and D (blaOXA-23-like, blaOXA-24-like, blaOXA-48-like, blaOXA-58-like or blaOXA-143-like), among which we will highlight Klebsiella pneumoniae, Pseudomonas aeruginosa, Acinetobacter baumannii, Serratia marcescens, and Providencia spp. With these results, we hope to contribute to the field by providing epidemiological molecular data for state surveillance on bacterial resistance and assisting in public policy decision-making.
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Affiliation(s)
- Levy Assis Dos Santos
- Federal University of Rondônia Foundation (UNIR), Postgraduate Program in Conservation and Use of Natural Resources (PPGReN), Porto Velho, RO, Brazil.
- Central Public Health Laboratory of Rondônia (LACEN/RO), Medical Biology Center, Porto Velho, RO, Brazil.
| | - Rodrigo Cayô
- Laboratory ALERTA, Department of Medicine, Paulista School of Medicine (EPM), Federal University of São Paulo (UNIFESP), São Paulo, SP, Brazil
- Laboratory of Bacteriology and Immunology (LIB), Department of Biological Sciences (DCB), Institute of Environmental, Chemical and Pharmaceutical Sciences (ICAQF), Federal University of São Paulo (UNIFESP), Diadema, SP, Brazil
| | - Tiago Barcelos Valiatti
- Laboratory ALERTA, Department of Medicine, Paulista School of Medicine (EPM), Federal University of São Paulo (UNIFESP), São Paulo, SP, Brazil
| | - Ana Cristina Gales
- Laboratory ALERTA, Department of Medicine, Paulista School of Medicine (EPM), Federal University of São Paulo (UNIFESP), São Paulo, SP, Brazil
| | - Larissa Fatarelli Bento de Araújo
- Federal University of Rondônia Foundation (UNIR), Postgraduate Program in Conservation and Use of Natural Resources (PPGReN), Porto Velho, RO, Brazil
| | - Fernando Marques Rodrigues
- Central Public Health Laboratory of Rondônia (LACEN/RO), Medical Biology Center, Porto Velho, RO, Brazil
| | - Tatiane Silva de Carvalho
- Central Public Health Laboratory of Rondônia (LACEN/RO), Medical Biology Center, Porto Velho, RO, Brazil
| | - Marcos André Braz Vaz
- Department of Informatics and Statistics, Federal University of Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Marcela Campanharo
- Federal University of Rondônia Foundation (UNIR), Postgraduate Program in Conservation and Use of Natural Resources (PPGReN), Porto Velho, RO, Brazil
- Department of Agricultural and Biological Sciences (DCAB), Federal University of Espirito Santo, São Mateus, ES, Brazil
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Hassan MA, Abd El-Aziz S, Nabil-Adam A, Tamer TM. Formulation of novel bioactive gelatin inspired by cinnamaldehyde for combating multi-drug resistant bacteria: Characterization, molecular docking, pharmacokinetic analyses, and in vitro assessments. Int J Pharm 2024; 652:123827. [PMID: 38253268 DOI: 10.1016/j.ijpharm.2024.123827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 01/13/2024] [Accepted: 01/19/2024] [Indexed: 01/24/2024]
Abstract
This study set out to formulate antibacterial and antioxidant gelatin boosted by cinnamaldehyde for combating multi-drug resistant bacteria previously obtained from chronic wounds. Towards this end, gelatin amine groups were conjugated with carbonyl groups of cinnamaldehyde, producing cinnamyl-gelatin Schiff bases. The physicochemical attributes of cinnamyl-gelatin Schiff bases were probed concerning alterations in chemical structures and microstructures compared to native gelatin. Besides, cinnamyl-gelatin Schiff bases exhibited higher thermal stability than gelatin, with a diminishing in solubility due to increases in hydrophobicity features. Interestingly, cinnamyl-gelatin derivatives exerted antibacterial activities versus multi-drug resistant Gram-negative and Gram-positive bacteria, showing maximum growth inhibition at the highest concentration of cinnamaldehyde incorporated into gelatin. The scavenging activities of gelatin against DPPH and ABTS•+ were promoted in cinnamyl-gelatin derivatives from 11.93 ± 0.6 % to 49.9 ± 2.5 % and 12.54 ± 0.63 % to 49.9 ± 3.12 %, respectively. Remarkably, cinnamyl-gelatin derivatives induced the proliferation of fibroblast cells, implying their prospective applications in tissue engineering. Molecular docking and pharmacokinetic investigations disclosed the potential antibacterial mechanisms of cinnamyl-gelatin derivatives alongside their biopharmaceutical applications. Altogether, these findings suggest that cinnamyl-gelatin derivatives could be utilized to tailor antibacterial-free antibiotics and antioxidant wound dressings against virulent bacteria to promote chronic wound recovery.
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Affiliation(s)
- Mohamed A Hassan
- Protein Research Department, Genetic Engineering and Biotechnology Research Institute (GEBRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934 Alexandria, Egypt.
| | - Sarah Abd El-Aziz
- Polymer Materials Research Department, Advanced Technologies, and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934 Alexandria, Egypt
| | - Asmaa Nabil-Adam
- Marine Biotechnology and Natural Products Laboratory, National Institute of Oceanography & Fisheries, Cairo 11516, Egypt
| | - Tamer M Tamer
- Polymer Materials Research Department, Advanced Technologies, and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, 21934 Alexandria, Egypt.
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Chang HC, Chang CH, Tien KL, Tai CH, Lin LM, Lee TF, Ku SC, Fang CT, Chen YC, Sheng WH. Impact of coronavirus disease 2019 (COVID-19) on antimicrobial resistance among major pathogens causing healthcare-associated infection. J Formos Med Assoc 2024; 123:123-132. [PMID: 37451958 DOI: 10.1016/j.jfma.2023.06.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 05/29/2023] [Accepted: 06/29/2023] [Indexed: 07/18/2023] Open
Abstract
BACKGROUND Coronavirus disease 2019 (COVID-19) has caused great impact on healthcare systems, including antibiotic usage and multi-drug resistant (MDR) bacterial infections at hospitals. We aim to investigate the trends of antimicrobial resistance among the major pathogens causing healthcare-associated infection (HAI) at intensive care units (ICU). MATERIAL AND METHODS The demographic characteristics of hospitalization, usage of antimicrobial agents, counted by half-an-year DID (defined daily dose per 1000 patient-days), and HAI density of five major MDR bacteria, including methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant enterococci (VRE), carbapenem-resistant Acinetobacter baumannii (CRAB), carbapenem-resistant Klebsiella pneumoniae (CRKP), and carbapenem-resistant Pseudomonas aeruginosa (CRPA), of ICU patients at a medical center in Taiwan during January 2017 to December 2021 were collected and analyzed. RESULTS The total antibiotic usage, counted by DID, had a significant increasing trend, before COVID-19 occurrence in 2017-2019, but no further increase during the pandemic period in 2020-2021. However, comparing the two time periods, antibiotics consumption was significantly increased during pandemic period. There was no significant change of HAI density in MRSA, VRE, CRAB, CRKP, and CRPA, comparing the pandemic to the pre-pandemic period. Although, CRKP and CRPA infection rates were increasing during the pre-pandemic period, there was no further increase of CRKP and CRPA HAI rates during the pandemic period. CONCLUSION During COVID-19 pandemic, there was no significant increase in HAI density of five major MDR bacteria at ICU in Taiwan, despite increased antibiotic usage. Strict infection prevention measures for COVID-19 precautions and sustained antimicrobial stewardship probably bring these effects.
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Affiliation(s)
- Hao-Chun Chang
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, National Taiwan University Hsin-Chu Branch, Biomedical Park Hospital, Hsin-Chu County, Taiwan
| | - Che-Hao Chang
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei City, Taiwan
| | - Kuei-Lien Tien
- Infection Control Center, National Taiwan University Hospital, Taipei City, Taiwan
| | - Chih-Hsun Tai
- Department of Pharmacy, National Taiwan University Hospital, Taipei City, Taiwan
| | - Li-Min Lin
- Department of Nursing, National Taiwan University Hospital, Taipei City, Taiwan
| | - Tai-Fen Lee
- Department of Laboratory Medicine, National Taiwan University Hospital, Taipei City, Taiwan
| | - Shih-Chi Ku
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, National Taiwan University Hospital, Taipei City, Taiwan
| | - Chi-Tai Fang
- Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei City, Taiwan; Division of Infectious Disease, Department of Internal Medicine, National Taiwan University Hospital, Taipei City, Taiwan
| | - Yee-Chun Chen
- Division of Infectious Disease, Department of Internal Medicine, National Taiwan University Hospital, Taipei City, Taiwan; School of Medicine, National Taiwan University College of Medicine, Taipei City, Taiwan
| | - Wang-Huei Sheng
- Division of Infectious Disease, Department of Internal Medicine, National Taiwan University Hospital, Taipei City, Taiwan; School of Medicine, National Taiwan University College of Medicine, Taipei City, Taiwan.
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Li M, Li J, Li J, Zhang J, Zhao Y, Li W, Zhang Y, Hu J, Xie X, Zhang D, Li H, Zhao Q, Gao H, Liang C. Design, synthesis, and evaluation of novel pleuromutilin aryl acrylate derivatives as promising broad-spectrum antibiotics especially for combatting multi-drug resistant gram-negative bacteria. Eur J Med Chem 2023; 259:115653. [PMID: 37531743 DOI: 10.1016/j.ejmech.2023.115653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 07/04/2023] [Accepted: 07/13/2023] [Indexed: 08/04/2023]
Abstract
The emergence of drug-resistant strains presents a grave challenge for traditional antibiotics, underscoring the exigency of exploring novel antibacterial drugs. To address this, the present study endeavors to design and synthesize a collection of pleuromutilin aromatic acrylate derivatives, guided by combination principles. The antibacterial activity and structure-activity relationship of these derivatives were evaluated, and most of the derivatives displayed moderate to excellent antibacterial activity against both Gram-positive bacteria and Gram-negative bacteria. Among these derivatives, 5g exhibited the strongest antibacterial activity, with MIC (minimum inhibitory concentration) values ranging from 1-32 μg/mL, and a MIC value against clinically isolated drug-resistant strains of 4-64 μg/mL. Additionally, 5g exhibited negligible cytotoxicity, superior anti-mycoplasma activity, and a greater propensity to perturb bacterial cell membranes. Notably, the administration of 5g resulted in an increased survival rate of MRSA (Methicillin-resistant Staphylococcus aureus)-infected mice, with an ED50 (median effective dose) value of 9.04 mg/kg. These results indicated the potential of 5g to be further developed as an antibacterial drug for the clinical treatment of drug-resistant bacterial infections.
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Affiliation(s)
- Min Li
- College of Pharmacy, Xinjiang Medical University, No.567 Shangde North Road, Urumqi, Xinjiang, 830001, PR China.
| | - Jialin Li
- School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi'an, 710021, PR China
| | - Jingyi Li
- School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi'an, 710021, PR China
| | - Jie Zhang
- School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi'an, 710021, PR China
| | - Yuqing Zhao
- School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi'an, 710021, PR China
| | - Wenying Li
- College of Pharmacy, Xinjiang Medical University, No.567 Shangde North Road, Urumqi, Xinjiang, 830001, PR China
| | - Yunfei Zhang
- School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi'an, 710021, PR China
| | - Jinrong Hu
- School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi'an, 710021, PR China
| | - Xiaolin Xie
- Shaanxi Panlong Pharmaceutical Group Co., Ltd., Xi'an, 710025, PR China
| | - Dezhu Zhang
- Shaanxi Panlong Pharmaceutical Group Co., Ltd., Xi'an, 710025, PR China
| | - Han Li
- School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi'an, 710021, PR China
| | - Qianqian Zhao
- School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi'an, 710021, PR China.
| | - Hong Gao
- Shaanxi Pioneer Biotech Co., Ltd., Xi'an, 710021, PR China
| | - Chengyuan Liang
- School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi'an, 710021, PR China.
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Jiang Z, Fu L, Wei C, Fu Q, Pan S. Antibacterial micro/nanomotors: advancing biofilm research to support medical applications. J Nanobiotechnology 2023; 21:388. [PMID: 37875896 PMCID: PMC10599038 DOI: 10.1186/s12951-023-02162-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Accepted: 10/13/2023] [Indexed: 10/26/2023] Open
Abstract
Multi-drug resistant (MDR) bacterial infections are gradually increasing in the global scope, causing a serious burden to patients and society. The formation of bacterial biofilms, which is one of the key reasons for antibiotic resistance, blocks antibiotic penetration by forming a physical barrier. Nano/micro motors (MNMs) are micro-/nanoscale devices capable of performing complex tasks in the bacterial microenvironment by transforming various energy sources (including chemical fuels or external physical fields) into mechanical motion or actuation. This autonomous movement provides significant advantages in breaking through biological barriers and accelerating drug diffusion. In recent years, MNMs with high penetrating power have been used as carriers of antibiotics to overcome bacterial biofilms, enabling efficient drug delivery and improving the therapeutic effectiveness of MDR bacterial infections. Additionally, non-antibiotic antibacterial strategies based on nanomaterials, such as photothermal therapy and photodynamic therapy, are continuously being developed due to their non-invasive nature, high effectiveness, and non-induction of resistance. Therefore, multifunctional MNMs have broad prospects in the treatment of MDR bacterial infections. This review discusses the performance of MNMs in the breakthrough and elimination of bacterial biofilms, as well as their application in the field of anti-infection. Finally, the challenges and future development directions of antibacterial MNMs are introduced.
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Affiliation(s)
- Zeyu Jiang
- Department of Emergency Medicine, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266003, China
- Institute for Translational Medicine, The Affiliated Hospital of Qingdao University, College of Medicine, Qingdao University, Qingdao, 266021, China
| | - Lejun Fu
- School of Chemistry and Materials Science, Anhui Normal University, Wuhu, 230022, China
| | - Chuang Wei
- Institute for Translational Medicine, The Affiliated Hospital of Qingdao University, College of Medicine, Qingdao University, Qingdao, 266021, China
| | - Qinrui Fu
- Institute for Translational Medicine, The Affiliated Hospital of Qingdao University, College of Medicine, Qingdao University, Qingdao, 266021, China.
| | - Shuhan Pan
- Department of Emergency Medicine, The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266003, China.
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Hu JN, Hu SQ, Li ZL, Bao C, Liu Q, Liu C, Xu SY. Risk factors of multidrug-resistant bacteria infection in patients with ventilator-associated pneumonia: A systematic review and meta-analysis. J Infect Chemother 2023; 29:942-947. [PMID: 37321291 DOI: 10.1016/j.jiac.2023.06.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 02/03/2023] [Accepted: 06/12/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND Multidrug-resistant (MDR) bacteria-induced VAP often has high lethality. We present this systematic review and meta-analysis to assess the risk factors for MDR bacterial infection in patients with VAP. METHODS PubMed, EMBASE, Web of Science, and Cochrane Library were searched for studies regarding MDR bacterial infection in VAP patients, from Jan 1996 to Aug 2022. Study selection, data extraction, and quality assessment of included studies were conducted by two reviewers independently, and potential risk factors for MDR bacterial infection were identified. RESULTS Meta-analysis showed that the score of the Acute Physiology and Chronic Health Evaluation II (APACHE-II) [OR = 1.009, 95% (CI 0.732, 1.287)], Simplified Acute Physiology Score II (SAPS-II) [OR = 2.805, 95%CI (0.854, 4.755)], length of hospital-stay before VAP onset (days) [OR = 2.639, 95%CI (0.387, 4.892)], in-ICU duration [OR = 3.958, 95%CI (0.894, 7.021)], Charlson index [OR = 1.000, 95%CI (0.889, 1.111)], overall hospital-stay [OR = 20.742, 95%CI (18.894, 22.591)], Medication of Quinolones [OR = 2.017, 95%CI (1.339, 3.038)], medication of carbapenems [OR = 3.527, 95%CI (2.476, 5.024)], combination of more than 2 prior antibiotics [OR = 3.181, 95%CI (2.102, 4.812)], and prior use of antibiotics [OR 2.971, 95%CI (2.001, 4.412)] were independent risk factors of MDR bacterial infection in VAP patients. Diabetes and mechanical ventilation duration before VAP onset showed no association with risk for MDR bacterial infection. CONCLUSIONS This study has identified 10 risk factors associated with MDR bacterial infection in VAP patients. Identification of these factors would be able to facilitate the treatment and prevention of MDR bacterial infection in clinical practice.
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Affiliation(s)
- Jian-Nan Hu
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Pulmonary Diseases of Health Ministry, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
| | - Sheng-Qi Hu
- Department of Neurosurgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, No. 1095 Jiefang Road, Wuhan, 430030, Hubei Province, PR China.
| | - Zi-Ling Li
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Pulmonary Diseases of Health Ministry, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
| | - Chen Bao
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Pulmonary Diseases of Health Ministry, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
| | - Qian Liu
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Pulmonary Diseases of Health Ministry, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
| | - Chao Liu
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Pulmonary Diseases of Health Ministry, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
| | - Shu-Yun Xu
- Department of Respiratory and Critical Care Medicine, Key Laboratory of Pulmonary Diseases of Health Ministry, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
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Yi Y, Zhang J, Zuo J, Zhang M, Yang S, Huang Z, Li G, Shang R, Lin S. Novel pyridinium cationic pleuromutilin analogues overcoming bacterial multidrug resistance. Eur J Med Chem 2023; 251:115269. [PMID: 36924667 DOI: 10.1016/j.ejmech.2023.115269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 03/07/2023] [Accepted: 03/08/2023] [Indexed: 03/13/2023]
Abstract
A series of pyridinium cation-substituted pleuromutilin analogues were designed, synthesized and evaluated for their antibacterial activities in vitro and in vivo. Most derivatives showed potent antibacterial activities, especially e4 that displayed the highest antibacterial activity against multi-drug resistant bacteria and was subjected to time-kill kinetics, resistance studies, cytotoxicity and molecular docking assays. Molecular docking results, scanning electron microscopy and o-nitrophenyl-β-galactopyranoside tests showed that e4 not only inhibited bacterial protein synthesis but also disrupted bacterial cell walls. Compound e4 showed an ED50 of 5.68 mg/kg against multi-drug resistant Staphylococcus aureus in infected mice model. In in vivo and in vitro toxicity tests, e4 showed low toxic effects with an LD50 of 879 mg/kg to mice. These results suggest that compound e4 may be considered as a new therapeutic candidate for bacterial infections.
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Affiliation(s)
- Yunpeng Yi
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan, 250100, Shandong, China
| | - Jiaming Zhang
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan, 250100, Shandong, China
| | - Jiakun Zuo
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 200241, Shanghai, China
| | - Maolu Zhang
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan, 250100, Shandong, China
| | - Shifa Yang
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan, 250100, Shandong, China
| | - Zhongli Huang
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan, 250100, Shandong, China
| | - Guiyu Li
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou, 730070, Gansu, China
| | - Ruofeng Shang
- Key Laboratory of New Animal Drug Project, Gansu Province/Key Laboratory of Veterinary Pharmaceutical Development, Ministry of Agriculture and Rural Affairs/Lanzhou Institute of Husbandry and Pharmaceutical Sciences of CAAS, Lanzhou 730050, Gansu, China.
| | - Shuqian Lin
- Shandong Provincial Animal and Poultry Green Health Products Creation Engineering Laboratory, Institute of Poultry Science, Shandong Academy of Agricultural Science, Jinan, 250100, Shandong, China.
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Rončević T, Gerdol M, Mardirossian M, Maleš M, Cvjetan S, Benincasa M, Maravić A, Gajski G, Krce L, Aviani I, Hrabar J, Trumbić Ž, Derks M, Pallavicini A, Weingarth M, Zoranić L, Tossi A, Mladineo I. Anisaxins, helical antimicrobial peptides from marine parasites, kill resistant bacteria by lipid extraction and membrane disruption. Acta Biomater 2022; 146:131-144. [PMID: 35470073 DOI: 10.1016/j.actbio.2022.04.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 04/12/2022] [Accepted: 04/14/2022] [Indexed: 12/21/2022]
Abstract
An infecting and propagating parasite relies on its innate defense system to evade the host's immune response and to survive challenges from commensal bacteria. More so for the nematode Anisakis, a marine parasite that during its life cycle encounters both vertebrate and invertebrate hosts and their highly diverse microbiotas. Although much is still unknown about how the nematode mitigates the effects of these microbiota, its antimicrobial peptides likely play an important role in its survival. We identified anisaxins, the first cecropin-like helical antimicrobial peptides originating from a marine parasite, by mining available genomic and transcriptomic data for Anisakis spp. These peptides are potent bactericidal agents in vitro, selectively active against Gram-negative bacteria, including multi-drug resistant strains, at sub-micromolar concentrations. Their interaction with bacterial membranes was confirmed by solid state NMR (ssNMR) and is highly dependent on the peptide concentration as well as peptide to lipid ratio, as evidenced by molecular dynamics (MD) simulations. MD results indicated that an initial step in the membranolytic mode of action involves membrane bulging and lipid extraction; a novel mechanism which may underline the peptides' potency. Subsequent steps include membrane permeabilization leading to leakage of molecules and eventually cell death, but without visible macroscopic damage, as shown by atomic force microscopy and flow cytometry. This membranolytic antibacterial activity does not translate to cytotoxicity towards human peripheral blood mononuclear cells (HPBMCs), which was minimal at well above bactericidal concentrations, making anisaxins promising candidates for further drug development. STATEMENT OF SIGNIFICANCE: Witnessing the rapid spread of antibiotic resistance resulting in millions of infected and dozens of thousands dying worldwide every year, we identified anisaxins, antimicrobial peptides (AMPs) from marine parasites, Anisakis spp., with potent bactericidal activity and selectivity towards multi-drug resistant Gram-negative bacteria. Anisaxins are membrane-active peptides, whose activity, very sensitive to local peptide concentrations, involves membrane bulging and lipid extraction, leading to membrane permeabilization and bacterial cell death. At the same time, their toxicity towards host cells is negligible, which is often not the case for membrane-active AMPs, therefore making them suitable drug candidates. Membrane bulging and lipid extraction are novel concepts that broaden our understanding of peptide interactions with bacterial functional structures, essential for future design of such biomaterials.
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Affiliation(s)
- Tomislav Rončević
- Department of Biology, Faculty of Science, University of Split, Ruđera Boškovića 33, Split 21000, Croatia.
| | - Marco Gerdol
- Department of Life Sciences, University of Trieste, Trieste 34127, Italy
| | - Mario Mardirossian
- Department of Medical Sciences, University of Trieste, Trieste 34125, Italy
| | - Matko Maleš
- Faculty of Maritime Studies, University of Split, Split 21000, Croatia
| | - Svjetlana Cvjetan
- Laboratory for Aquaculture, Institute of Oceanography and Fisheries, Split 21000, Croatia
| | - Monica Benincasa
- Department of Life Sciences, University of Trieste, Trieste 34127, Italy
| | - Ana Maravić
- Department of Biology, Faculty of Science, University of Split, Ruđera Boškovića 33, Split 21000, Croatia
| | - Goran Gajski
- Mutagenesis Unit, Institute for Medical Research and Occupational Health, Zagreb 10000, Croatia
| | - Lucija Krce
- Department of Physics, Faculty of Science, University of Split, Split 21000, Croatia
| | - Ivica Aviani
- Department of Physics, Faculty of Science, University of Split, Split 21000, Croatia
| | - Jerko Hrabar
- Laboratory for Aquaculture, Institute of Oceanography and Fisheries, Split 21000, Croatia
| | - Željka Trumbić
- University Department of Marine Studies, University of Split, Split 21000, Croatia
| | - Maik Derks
- NMR spectroscopy, Bijvoet Centre for Biomolecular Research, University of Utrecht, Utrecht 3584CH, The Netherlands; Membrane Biochemistry and Biophysics, Bijvoet Centre for Biomolecular Research, Department of Chemistry, Utrecht University, Padualaan 8, Utrecht 3584 CH, The Netherlands
| | - Alberto Pallavicini
- Department of Life Sciences, University of Trieste, Trieste 34127, Italy; Oceanography Division, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS, Trieste, Italy
| | - Markus Weingarth
- NMR spectroscopy, Bijvoet Centre for Biomolecular Research, University of Utrecht, Utrecht 3584CH, The Netherlands
| | - Larisa Zoranić
- Department of Physics, Faculty of Science, University of Split, Split 21000, Croatia
| | - Alessandro Tossi
- Department of Life Sciences, University of Trieste, Trieste 34127, Italy
| | - Ivona Mladineo
- Laboratory of Functional Helminthology, Biology Centre Czech Academy of Sciences, Institute of Parasitology BC CAS, Branisovska 31, Ceske Budejovice 37005, Czech Republic.
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Garnacho-Montero J, Amaya-Villar R. The problem of multi-resistance in gram-negative bacilli in intensive care units: Treatment and prevention strategies. Med Intensiva 2022; 46:326-335. [PMID: 35545496 DOI: 10.1016/j.medine.2022.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 12/04/2021] [Indexed: 06/15/2023]
Abstract
The rise of infections caused by multi-resistant gram-negative bacilli (MR-GNB), which includes carbapenems, represents one of the major current challenges worldwide. These MR-GNB include extended spectrum β-lactamase-producing Enterobacterales, derepressed AmpC-producing or carbapenemase-producing Enterobacterales as well as non-fermenting Gram-negative bacilli such as Pseudomonas aeruginosa or Acinetobacter baumannii. P. aeruginosa predominantly exhibits other resistance mechanisms different to β-lactamases such as expulsion pumps or loss of porins. A. baumannii frequently presents several of these resistance mechanisms. Mortality is high especially if empirical treatment is inadequate. In this review, treatment strategies are revised, describing the tools available to identify patients in whom empirical antibiotic treatment would be justified to cover MR-GNB, the importance of optimizing the administration of these antibiotics, as well as prevention strategies to avoid its spread from patients colonized or infected by a MR-GNB.
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Affiliation(s)
- J Garnacho-Montero
- Unidad Clínica de Cuidados Intensivos, Hospital Universitario Virgen Macarena, Sevilla, Spain.
| | - R Amaya-Villar
- Unidad Clínica de Cuidados Intensivos, Hospital Universitario Virgen del Rocío, Sevilla, Spain
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10
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Thomson K, Eskola K, Eklund M, Suominen K, Määttä M, Junnila J, Nykäsenoja S, Niinistö K, Grönthal T, Rantala M. Characterisation of and risk factors for extended-spectrum β-lactamase producing Enterobacterales (ESBL-E) in an equine hospital with a special reference to an outbreak caused by Klebsiella pneumoniae ST307:CTX-M-1. Acta Vet Scand 2022; 64:4. [PMID: 35139865 DOI: 10.1186/s13028-022-00621-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Accepted: 01/16/2022] [Indexed: 11/10/2022] Open
Abstract
Background Extended-spectrum β-lactamase producing Enterobacterales (ESBL-E) are important causative agents for infections in humans and animals. At the Equine Veterinary Teaching Hospital of the University of Helsinki, the first infections caused by ESBL-E were observed at the end of 2011 leading to enhanced infection surveillance. Contact patients were screened for ESBL-E by culturing infection sites and rectal screening. This study was focused on describing the epidemiology and microbiological characteristics of ESBL-E from equine patients of the EVTH during 2011–2014, and analysing putative risk factors for being positive for ESBL-E during an outbreak of Klebsiella pneumoniae ST307. Results The number of ESBL-E isolations increased through 2012–2013 culminating in an outbreak of multi-drug resistant K. pneumoniae ST307:blaCTX-M-1:blaTEM:blaSHV during 04–08/2013. During 10/2011–05/2014, altogether 139 ESBL-E isolates were found from 96 horses. Of these, 26 were from infection-site specimens and 113 from rectal-screening swabs. A total of 118 ESBL-E isolates from horses were available for further study, the most numerous being K. pneumoniae (n = 44), Escherichia coli (n = 31) and Enterobacter cloacae (n = 31). Hospital environmental specimens (N = 47) yielded six isolates of ESBL-E. Two identical E. cloacae isolates originating from an operating theatre and a recovery room had identical or highly similar PFGE fingerprint profiles as five horse isolates. In the multivariable analysis, mare–foal pairs (OR 4.71, 95% CI 1.57–14.19, P = 0.006), length of hospitalisation (OR 1.62, 95% CI 1.28–2.06, P < 0.001) and passing of a nasogastric tube (OR 2.86, 95% CI 1.03–7.95, P = 0.044) were associated with being positive for ESBL-E during the K. pneumoniae outbreak. Conclusions The occurrence of an outbreak caused by a pathogenic ESBL-producing K. pneumoniae ST307 strain highlights the importance of epidemiological surveillance of ESBL-E in veterinary hospitals. Limiting the length of hospitalisation for equine patients may reduce the risk of spread of ESBL-E. It is also important to acknowledge the importance of nasogastric tubing as a potential source of acquiring ESBL-E. As ESBL-E were also found in stomach drench pumps used with nasogastric tubes, veterinary practices should pay close attention to appropriate equipment cleaning procedures and disinfection practices. Supplementary Information The online version contains supplementary material available at 10.1186/s13028-022-00621-6.
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11
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Raad C, Behdenna A, Fuhrmann C, Conter C, Cuzzubbo D, Rasigade JP, Bertrand Y, Domenech C. Trends in bacterial bloodstream infections and resistance in immuno-compromised patients with febrile neutropenia: a retrospective analysis. Eur J Pediatr 2021; 180:2921-30. [PMID: 33835249 DOI: 10.1007/s00431-021-04056-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 03/13/2021] [Accepted: 03/29/2021] [Indexed: 10/21/2022]
Abstract
Bacterial infections remain a major cause of morbidity and mortality in immunocompromised children. From the onset of fever, an early administration of broad-spectrum antibiotics is begun; this strategy could induce emergence of multi-drug resistant bacteria (MDR). We describe the incidence and microbiological spectrum, including MDR bacteria of bacterial documented blood-stream infections (BSI) in immunocompromised children. A retrospective, descriptive study was conducted in a tertiary referral centre in France from January 2014 to December 2017. Our cohort included a large scale of patients with febrile neutropenia: haematological and oncological malignancies, haematopoietic stem cell transplantations, severe combined immunodeficiency syndromes. BSI were defined by positive blood culture samples associated with fever. Among 760 febrile neutropenia episodes in 7301 admitted patients, we identified 310 documented BSI with a mean of 7.4 BSI/1000 patient bed days. Only 2.9% BSIs were caused by MDR bacteria, none vancomycin resistant. Coagulase-negative staphylococci were identified in 49.7% BSI and Staphylococcus aureus caused 6.5% infections. Gram-negative bacilli accounted for 21.6% of isolated bacteria, Pseudomonas for 4.8%. The incidence of BSI annually decreased by 0.75% (p = 0.002).Conclusion: With a step-down strategy at 48 h of initial broad-spectrum antibiotic therapy, we reported a low number of MDR bacteria, no deaths related to BSI. What is Known: • Bacterial bloodstream infections are a leading cause of morbidity and mortality in immunocompromised children • Multi-drug resistant bacteria are emerging worldwide. What is New: • Initial broad-spectrum antibiotic therapy with a step-down strategy at 48 h: no deaths related to bloodstream infections with a low number of resistant bacteria. • Parental and nurse stewardship to decrease bloodstream infections incidence with a drop of staphylococcal infections.
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Alharbi NM, Ziadi MM. Wastewater as a fertility source for novel bacteriophages against multi-drug resistant bacteria. Saudi J Biol Sci 2021; 28:4358-4364. [PMID: 34354420 PMCID: PMC8324929 DOI: 10.1016/j.sjbs.2021.04.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 04/07/2021] [Accepted: 04/08/2021] [Indexed: 01/21/2023] Open
Abstract
Antibiotic resistance is a common and serious public health worldwide. As an alternative to antibiotics, bacteriophage (phage) therapy offers one of the best solutions to antibiotic resistance. Bacteriophages survive where their bacterial hosts are found; thus, they exist in almost all environments and their applications are quite varied in the medical, environmental, and industrial fields. Moreover, a single phage or a mixture of phages can be used in phage therapy; mixed phages tend to be more effective in reducing the number and/or activity of pathogenic bacteria than that of a single phage.
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Affiliation(s)
- Najwa M. Alharbi
- College of Science, King Abdulaziz University, Jeddah, Saudi Arabia
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13
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Wahab S, Khan T, Adil M, Khan A. Mechanistic aspects of plant-based silver nanoparticles against multi-drug resistant bacteria. Heliyon 2021; 7:e07448. [PMID: 34286126 PMCID: PMC8273360 DOI: 10.1016/j.heliyon.2021.e07448] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 06/05/2021] [Accepted: 06/28/2021] [Indexed: 12/23/2022] Open
Abstract
Resistance among pathogenic bacteria to the existing antibiotics is one of the most alarming problems of the modern world. Alongwith reducing the use of antibiotics, and antibiotic stewardship, an alternative to antibiotics is much needed in the current scenario to combact infectious diseases. One alternative is to produce nanomaterials, especially, silver nanoparticles (AgNPs) against antibiotic-resistant bacteria. AgNPs are the most vital and fascinating nanoparticles because of their unique structural and functional properties and application against pathogenic bacteria. However, the synthesis of AgNPs remains a problem because of the chemicals and energy requirements and the byproducts of the reactions. Concerns have been raised about using chemically and physically synthesized nanoparticles because of their potential risks to the human body, animals, and environment. Green synthesis of these nanoparticles is a better alternative to physical and chemical approaches. Plant-based synthesis in turn is a method which can provide AgNPs that are cost-effective and eco-friendly as well as biocompatible. The specific features of size, morphology and shape of plant-based AgNPs give them the potency to fight multi-drug resistant bacteria. A detailed look into mechanistic aspects of the action of AgNPs against resistant bacteria with a focus on characteristic properties of AgNPs is required. This review discusses in detail these aspects and the potential of plant-based AgNPs as a solution to antibiotic resistance.
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Affiliation(s)
- Shahid Wahab
- Department of Biotechnology, University of Malakand, Chakdara Dir Lower, Pakistan
| | - Tariq Khan
- Department of Biotechnology, University of Malakand, Chakdara Dir Lower, Pakistan
| | - Muhammad Adil
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, National Centre for Nanoscience and Technology (NCNST), China
| | - Ajmal Khan
- Department of Biology, University of North Carolina at Greensboro, NC, United States
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Schauwvlieghe A, Dunbar A, Storme E, Vlak A, Aerts R, Maertens J, Sciot B, Van Der Wel T, Papageorgiou G, Moors I, Cornelissen J, Rijnders B, Mercier T. Stopping antibiotic therapy after 72 h in patients with febrile neutropenia following intensive chemotherapy for AML/MDS (safe study): A retrospective comparative cohort study. EClinicalMedicine 2021; 35:100855. [PMID: 33997746 PMCID: PMC8099620 DOI: 10.1016/j.eclinm.2021.100855] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 03/29/2021] [Accepted: 03/31/2021] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Induction chemotherapy for acute myeloid leukemia (AML) or myelodysplastic syndrome (MDS) is almost universally complicated by febrile neutropenia(FN). Empirical broad-spectrum antibiotic therapy (EBAT) strategies advocated by guidelines result in long periods of broad-spectrum antibiotic therapy. We compared the outcome of AML/MDS patients treated with a 3-day versus a prolonged (until neutrophil recovery) regimen. METHODS This is a retrospective comparative cohort study in AML or MDS patients undergoing remission-induction chemotherapy from 2011 to 2019, comparing 2 tertiary care hospitals with different strategies regarding antibiotic treatment for FN. At Erasmus University medical center(EMC), EBAT was stopped after 3 days of FN, in absence of a clinically or microbiologically documented infection. In the University Hospitals Leuven(UZL), a prolonged strategy was used, where EBAT was given until neutrophil recovery. The primary endpoint was a serious medical complication(SMC) defined as death or ICU admission in the 30 days after the start of chemotherapy. FINDINGS 305 and 270 AML or MDS patients received chemotherapy at EMC and UZL, respectively. Broad-spectrum antibiotic treatment was given for a median of 19 days (IQR13-25) at UZL versus 9 days at EMC (IQR5-13) (p <0·001). With the 3-day EBAT strategy, an SMC was observed in 12·5% versus 8·9% with the prolonged strategy (p = 0·17). The hazard ratio for an SMC was not significantly higher with the 3-day strategy (HR 1·357,95%CI 0·765-2·409). INTERPRETATION This study suggests that during remission induction chemotherapy it is safe to stop antibiotics after 3 days of FN in absence of infection. A comparison of both strategies in a prospective trial should be pursued.
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Affiliation(s)
- A. Schauwvlieghe
- Department of hematology, Ghent University Hospital, Gent, Belgium
- Internal Medicine, Infectious Diseases, Erasmus University Medical Center, Rotterdam, Netherlands
- Department of Hematology, Universitaire Ziekenhuizen Leuven, KU Leuven, Belgium
- Department of Hematology, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, Netherlands
- Corresponding author at: Department of hematology, Ghent University Hospital, Gent, Belgium.
| | - A. Dunbar
- Internal Medicine, Infectious Diseases, Erasmus University Medical Center, Rotterdam, Netherlands
| | - E. Storme
- Department of Hematology, Universitaire Ziekenhuizen Leuven, KU Leuven, Belgium
| | - A. Vlak
- Internal Medicine, Infectious Diseases, Erasmus University Medical Center, Rotterdam, Netherlands
| | - R. Aerts
- Department of Hematology, Universitaire Ziekenhuizen Leuven, KU Leuven, Belgium
- Department of Microbiology, Immunology and Transplantation, Katholieke Universiteit Leuven, Leuven 3000, Belgium
| | - J. Maertens
- Department of Hematology, Universitaire Ziekenhuizen Leuven, KU Leuven, Belgium
| | - B. Sciot
- Department of Hematology, Universitaire Ziekenhuizen Leuven, KU Leuven, Belgium
| | - T. Van Der Wel
- Internal Medicine, Infectious Diseases, Erasmus University Medical Center, Rotterdam, Netherlands
| | - G. Papageorgiou
- Department of Biostatistics, Erasmus University Medical Centre, Rotterdam, Netherlands
| | - I. Moors
- Department of hematology, Ghent University Hospital, Gent, Belgium
| | - J.J. Cornelissen
- Department of Hematology, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, Netherlands
| | - B.J.A. Rijnders
- Internal Medicine, Infectious Diseases, Erasmus University Medical Center, Rotterdam, Netherlands
| | - T. Mercier
- Department of Hematology, Universitaire Ziekenhuizen Leuven, KU Leuven, Belgium
- Department of Microbiology, Immunology and Transplantation, Katholieke Universiteit Leuven, Leuven 3000, Belgium
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15
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Rajivgandhi GN, Alharbi NS, Kadaikunnan S, Khaled JM, Kanisha CC, Ramachandran G, Manoharan N, Alanzi KF. Identification of carbapenems resistant genes on biofilm forming K. pneumoniae from urinary tract infection. Saudi J Biol Sci 2021; 28:1750-1756. [PMID: 33732058 PMCID: PMC7938117 DOI: 10.1016/j.sjbs.2020.12.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Revised: 12/08/2020] [Accepted: 12/09/2020] [Indexed: 11/29/2022] Open
Abstract
The multi-drug resistant effect of the Gram negative bacteria K. pneumoniae was identified by disc diffusion method using specific UTI panel discs of Kleb 1 HX077 and Kleb 2 HX090 HEXA. Among the multi-drug resistant bacteria, the carbapenem resistant (CR) effect of the K. pneumoniae was screened by specific carbapenem detection antibiotics of HEXA HX066 and HX0103 HEXA by disc diffusion method. In addition, the effective antibiotics were further performed against K. pneumoniae by minimum inhibition concentration method. Further, the carbapenemase genes of VIM 1 and IMP 1 were detected from the isolated strains by multiplex PCR method. Furthermore, the biofilm forming ability of selected carbapenem resistant K. pneumoniae was initially identified by tissue culture plate method and confirmed by exopolysaccharide arrest ability of congo red agar assay. Finally, our result was proved that the identified K. pneumoniae is carbapenemase producing strain, and its virulence was extended with strong biofilm formation.
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Affiliation(s)
| | - Naiyf S. Alharbi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Shine Kadaikunnan
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Jamal M. Khaled
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | | | - Govindan Ramachandran
- Department of Marine Science, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India
| | - Natesan Manoharan
- Department of Marine Science, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India
| | - Khalid F. Alanzi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
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16
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Moretti M, Van Laethem J, Minini A, Pierard D, Malbrain MLNG. Ventilator-associated bacterial pneumonia in coronavirus 2019 disease, a retrospective monocentric cohort study. J Infect Chemother 2021; 27:826-833. [PMID: 33583739 PMCID: PMC7826005 DOI: 10.1016/j.jiac.2021.01.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 01/15/2021] [Accepted: 01/20/2021] [Indexed: 01/08/2023]
Abstract
Introduction Severe coronavirus 2019 disease (CoViD-19) may lead to respiratory failure and mechanical ventilation. Therefore, ventilator associated pneumonia (VAP) may complicate the course of the disease. The aim of the current article was to investigate possible predictive factors for bacterial VAP on a retrospective manner, in a cohort of mechanically ventilated CoViD-19 patients. Additionally, determinant factors of lethality were analyzed. Methods Medical records of patients hospitalized in the intensive care units (ICU) at the university hospital UZ Brussel during the epidemic were reviewed. VAP was defined following the National Healthcare Safety Network 2017 criteria. Univariate and multivariate logistic regressions analyses were performed. Results Among the 39 patients included in the study, 54% were diagnosed with bacterial VAP. Case fatality rate was 44%, but 59% of the deceased patients had a do-not-resuscitate status. Multivariate logistic regression for prediction of VAP showed significant differences in duration of ICU hospitalization and in minimal lung compliance. Additional analyses were performed on CoViD-19 patients who were affected by bacterial respiratory superinfection. The responsible pathogens correspond to the commonly found bacteria in VAP. However, 71% of the isolated germs were multi-drug resistant and bacteraemia was reported in 38%. Multivariate analyses for prediction of lethality found significant difference in SOFA score. Conclusions Mechanically ventilated CoViD-19 patients might frequently develop VAP. Longer ICU hospitalization was associated with pulmonary superinfection in the current cohort. Moreover, decreased minimal lung compliance was correlated to VAP and higher SOFA score at VAP diagnosis was associated with lethality.
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Affiliation(s)
- Marco Moretti
- Department of Internal Medicine and Infectious Diseases, Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium.
| | - Johan Van Laethem
- Department of Internal Medicine and Infectious Diseases, Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium
| | - Andrea Minini
- Faculty of Medicine and Pharmacy, University of Insubria, Como, Italy; Department of Intensive Care, Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium
| | - Denis Pierard
- Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium; Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Manu L N G Malbrain
- Faculty of Engineering, Department of Electronics and Informatics, Vrije Universiteit Brussel (VUB), Brussels, Belgium
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17
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Fan N, Hu Y, Shen H, Liu S, Zhao G, Sun L, Li C, Zhao X, Li Y, Wang J, Cui Y. Compositional and drug-resistance profiling of pathogens in patients with severe acute pancreatitis: a retrospective study. BMC Gastroenterol 2020; 20:405. [PMID: 33261570 PMCID: PMC7709241 DOI: 10.1186/s12876-020-01563-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 11/26/2020] [Indexed: 12/15/2022] Open
Abstract
Background Infection is one of the important causes of death in patients with severe acute pancreatitis (SAP), but the bacterial spectrum and antibiotic resistance are constantly changing. Making good use of antibiotics and controlling multi-drug-resistant (MDR) bacterial infections are of vital importance in improving the cure rate of SAP. We conducted a retrospective study in the hope of providing references for antibiotic selection and control of drug-resistant bacteria. Methods Retrospective analysis was performed on the data of patients hospitalized in our hospital due to acute pancreatitis (AP) in the past 5 years. General data were classified and statistically analyzed. Subsequently, the bacterial spectrum characteristics and the data related to drug-resistant bacterial infection of 569 AP patients were analyzed. Finally, unconditional logistic regression analysis was conducted to analyze the risk factors of MDR infection. Results A total of 398 patients were enrolled in this study and the hospitalization data and associated results were analyzed. A total of 461 strains of pathogenic bacteria were detected, including 223 (48.4%) gram-negative bacterial strains, 190 (41.2%) gram-positive bacterial strains and 48 (10.4%) fungal strains. The detection rates of resistance in gram-negative and gram-positive bacterial strains were 48.0% (107/223) and 25.3% (48/190), respectively. There were significant differences between the MDR group and the non-MDR group for the factors of precautionary antibiotic use, kinds of antibiotics used, receipt of carbapenem, tracheal intubation, hemofiltration and number of hospitalization days in the intensive care unit. Unconditional logistic regression revealed 2 risk factors for MDR bacterial infection. Conclusions Our results illustrate that gram-negative bacteria were the most common pathogens in SAP infection, and the proportion of gram-positive bacteria increased notably. The rate of antibiotic resistance was higher than previously reported. Unconditional logistic regression analysis showed that using more types of antibiotics and the number of hospitalization days in the ICU were the risk factors associated with MDR bacterial infection.
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Affiliation(s)
- Ning Fan
- Department of Surgery, Beichen Chinese Medicine Hospital, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Yong Hu
- Zhongnan Hospital of Wuhan University, No. 167, Donghu Road, Wuchang District, Wuhan, 430000, China
| | - Hong Shen
- Department of Surgery, Characteristic Medical Center of the Chinese People's Armed Police Force, Tianjin, China
| | - Shengjie Liu
- Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Guang Zhao
- Tianjin Nankai Hospital, Nankai Clinical School of Medicine, Tianjin Medical University, Tianjin, China
| | - Lanju Sun
- Tianjin Nankai Hospital, Nankai Clinical School of Medicine, Tianjin Medical University, Tianjin, China
| | - Chunyan Li
- Department of Gastroenterology, Affiliated Hospital of Panzhihua University, Nanchong, China
| | - Xin Zhao
- Department of Breast Surgery,Affiliated Cancer Hospital of Zhengzhou University, Henan Cancer Hospital, Zhengzhou, China
| | - Yanning Li
- Department of Surgery, Beichen Chinese Medicine Hospital, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Jianhua Wang
- Department of Surgery, Beichen Chinese Medicine Hospital, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Yunfeng Cui
- Tianjin Nankai Hospital, Nankai Clinical School of Medicine, Tianjin Medical University, Tianjin, China. .,Department of Surgery, Tianjin Nankai Hospital, Nankai Clinical School of Medicine, Tianjin Medical University, 122 Sanwei Road Nankai District, Tianjin, China.
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18
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Zhang F, Ramachandran G, Mothana RA, Noman OM, Alobaid WA, Rajivgandhi G, Manoharan N. Anti-bacterial activity of chitosan loaded plant essential oil against multi drug resistant K. pneumoniae. Saudi J Biol Sci 2020; 27:3449-3455. [PMID: 33304155 PMCID: PMC7715482 DOI: 10.1016/j.sjbs.2020.09.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 09/10/2020] [Accepted: 09/10/2020] [Indexed: 12/20/2022] Open
Abstract
The development of antibiotic resistant in K. pneumoniae is an emerging thread worldwide due to the poor antimicrobial drugs. To overcome this issue, researchers are focused on plant material and their essential oils to fight against multi drug resistant bacteria. In this context, the current study was concentrated in medicinal plant of guva leaves and their essential oils to combat multi drug resistant bacterial infections. The essential oils were successfully screened and confirmed by HRLC-MS analysis. The anti-bacterial ability of the compounds were loaded into the chitosan nanoparticles and proved by FT-IR analysis. In addition, the chitosan loaded essential oils morphology was compared with chitosan alone in SEM analysis and suggested that the material was loaded successfully. Further, the anti-bacterial ability of the chitosan loaded essential oils were primarily confirmed by agar well diffusion method. At the 100 µg/mL of lowest concentration of chitosan loaded essential oils, the multi-drug resistant K. pneumoniae was inhibited with 96% and confirmed by minimum inhibition concentration experiment. Hence, all the experiments were proved that the essential oils were successfully loaded into the chitosan nanoparticles, and it has more anti-bacterial activity against multi-drug resistant K. pneumoniae.
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Affiliation(s)
- Feng Zhang
- Chest Endoscopy Minimally Invasive Area, Shandong Provincial Chest Hospital, Shandong Province 250013, China
| | - G Ramachandran
- Department of Marine Science, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India
| | - Ramzi A Mothana
- Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. BOX 2457, Riyadh 11451, Saudi Arabia
| | - Omar M Noman
- Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. BOX 2457, Riyadh 11451, Saudi Arabia
| | - Waleed A Alobaid
- Department of Pharmacognosy, College of Pharmacy, King Saud University, P.O. BOX 2457, Riyadh 11451, Saudi Arabia
| | - G Rajivgandhi
- Department of Marine Science, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India
| | - N Manoharan
- Department of Marine Science, Bharathidasan University, Tiruchirappalli 620024, Tamil Nadu, India
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19
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Nan YM, Liu LD. [Diagnosis and treatment strategies for end-stage liver disease combined with infection]. Zhonghua Gan Zang Bing Za Zhi 2020; 28:545-547. [PMID: 32791786 DOI: 10.3760/cma.j.cn501113-20200619-00334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Patients with end-stage liver disease are more likely to be infected due to the changes in the liver's internal environment, low immune defense capabilities and reduced gut barrier function. Common infections include pneumonia, spontaneous bacterial peritonitis, biliary and urinary tract infections, skin and soft tissue infections, and spontaneous bacteremia, which in severe cases can lead to sepsis and septic shock. Importantly, infections can aggravate and progress to the liver and damage correlated organs, and thus can be life-threatening in severe cases. Therefore, early detection and diagnosis, as well as the use of effective antibacterial agents, and supportive treatment are keys to saving patients' lives.
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Affiliation(s)
- Y M Nan
- Key Laboratory of Study on Mechanism of Hepatic Fibrosis in Chronic Liver Disease in Hebei Province; Department of Traditional and Western Medical Hepatology, Third Hospital of Hebei Medical University, Shijiazhuang 050051, China
| | - L D Liu
- Key Laboratory of Study on Mechanism of Hepatic Fibrosis in Chronic Liver Disease in Hebei Province; Department of Traditional and Western Medical Hepatology, Third Hospital of Hebei Medical University, Shijiazhuang 050051, China
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Ren X, Zou L, Holmgren A. Targeting Bacterial Antioxidant Systems for Antibiotics Development. Curr Med Chem 2020; 27:1922-1939. [PMID: 31589114 DOI: 10.2174/0929867326666191007163654] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 09/18/2018] [Accepted: 12/13/2018] [Indexed: 12/15/2022]
Abstract
The emergence of multidrug-resistant bacteria has become an urgent issue in modern medicine which requires novel strategies to develop antibiotics. Recent studies have supported the hypothesis that antibiotic-induced bacterial cell death is mediated by Reactive Oxygen Species (ROS). The hypothesis also highlighted the importance of antioxidant systems, the defense mechanism which contributes to antibiotic resistance. Thioredoxin and glutathione systems are the two major thiol-dependent systems which not only provide antioxidant capacity but also participate in various biological events in bacteria, such as DNA synthesis and protein folding. The biological importance makes them promising targets for novel antibiotics development. Based on the idea, ebselen and auranofin, two bacterial thioredoxin reductase inhibitors, have been found to inhibit the growth of bacteria lacking the GSH efficiently. A recent study combining ebselen and silver exhibited a strong synergistic effect against Multidrug-Resistant (MDR) Gram-negative bacteria which possess both thioredoxin and glutathione systems. These drug-repurposing studies are promising for quick clinical usage due to their well-known profile.
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Affiliation(s)
- Xiaoyuan Ren
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Lili Zou
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden.,Translational Neuroscience & Neural Regeneration and Repair Institute/ Institute of Cell Therapy, The First Hospital of Yichang, Three Gorges University, 443000 Yichang, China
| | - Arne Holmgren
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden
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Kieslichova E, Protus M, Nemcova D, Uchytilova E. Single mutidrug resistant enterobacteriacae donor-derived infection in four solid organ transplant recipients: a case report. BMC Surg 2019; 19:111. [PMID: 31412850 PMCID: PMC6694600 DOI: 10.1186/s12893-019-0574-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 08/01/2019] [Indexed: 12/27/2022] Open
Abstract
Background Bacteraemia of the donor is not considered to be contraindication of organ procurement. On the other hand, infection of solid organ transplant recipients remains to be a major cause of their morbidity and mortality. When using organs from bacteraemic donors, individual risks need to be assessed and the appropriate antibiotic treatment applied. Case presentation In this case series we report several serious donor–derived infectious complications in four out of five recipients of different organs from one single donor in the early posttransplant period. Donor-transmitted multi-drug resistant strains of Escherichia coli and Klebsiella pneumonia was confirmed by both serologic and molecular testing. Conclusions To prevent donor-derived infections, careful microbiological screening followed by targeted antibiotic treatment is essential. Although such complications can never by completely prevented, a high index for potential bacterial infection in organ donors and transplant recipients should be routinely employed.
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Affiliation(s)
- Eva Kieslichova
- Department of Anesthesiology and Intensive Care, Transplantcentre, Institute for Clinical and Experimental Medicine, Prague, Czech Republic.
| | - Marek Protus
- Department of Anesthesiology and Intensive Care, Transplantcentre, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - Dana Nemcova
- Laboratory Methods Division - Department of Clinical Microbiology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - Eva Uchytilova
- Department of Anesthesiology and Intensive Care, Transplantcentre, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
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Dirchwolf M, Marciano S, Martínez J, Ruf AE. Unresolved issues in the prophylaxis of bacterial infections in patients with cirrhosis. World J Hepatol 2018; 10:892-897. [PMID: 30631393 PMCID: PMC6323518 DOI: 10.4254/wjh.v10.i12.892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Revised: 09/05/2018] [Accepted: 10/11/2018] [Indexed: 02/06/2023] Open
Abstract
Bacterial infections are highly prevalent and a frequent cause of hospitalization and short-term mortality in patients with cirrhosis. Due to their negative impact on survival, antibiotic prophylaxis for bacterial infections in high-risk subgroups of patients with cirrhosis has been the standard of care for decades. Patients with prophylaxis indications include those at risk for a first episode of spontaneous bacterial peritonitis (SBP) due to a low ascitic fluid protein count and impaired liver and kidney function, patients with a prior episode of SBP and those with an episode of gastrointestinal bleeding. Only prophylaxis due to gastrointestinal bleeding has a known and short-time duration. All other indications imply long-lasting exposure to antibiotics - once the threshold requirement for initiating prophylaxis is met - without standardized criteria for re-assessing antibiotic interruption. Despite the fact that the benefit of antibiotic prophylaxis in reducing bacterial infections episodes and mortality has been thoroughly reported, the extended use of antibiotics in patients with cirrhosis has also had negative consequences, including the emergence of multi-drug resistant bacteria. Currently, it is not clear whether restricting the use of broad and fixed antibiotic regimens, tailoring the choice of antibiotics to local bacterial epidemiology or selecting non-antibiotic strategies will be the preferred antibiotic prophylaxis strategy for patients with cirrhosis in the future.
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Affiliation(s)
- Melisa Dirchwolf
- Unidad de Hígado, Hospital Privado de Rosario, Rosario 2000, Argentina
| | - Sebastián Marciano
- Unidad de Hígado, and Departamento de Investigación del Hospital Italiano de Buenos Aires, Buenos Aires 1424, Argentina
| | - José Martínez
- Unidad de Hígado, Hospital Privado de Rosario, Rosario 2000, Argentina
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Ren X, Zou L, Lu J, Holmgren A. Selenocysteine in mammalian thioredoxin reductase and application of ebselen as a therapeutic. Free Radic Biol Med 2018; 127:238-247. [PMID: 29807162 DOI: 10.1016/j.freeradbiomed.2018.05.081] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 04/27/2018] [Accepted: 05/23/2018] [Indexed: 12/29/2022]
Abstract
Thioredoxin system is a ubiquitous disulfide reductase system evolutionarily conserved through all living organisms. It contains thioredoxin (Trx), thioredoxin reductase (TrxR) and NADPH. TrxR can use NADPH to reduce Trx which passes the reducing equivalent to its downstream substrates involved in various biomedical events, such as ribonucleotide reductase for deoxyribonucleotide and DNA synthesis, or peroxiredoxins for counteracting oxidative stress. Obviously, TrxR stays in the center of the system to maintain the electron flow. Mammalian TrxR contains a selenocysteine (Sec) in its active site, which is not present in the low molecular weight prokaryotic TrxRs. Due to the special property of Sec, mammalian TrxR employs a different catalytic mechanism from prokaryotic TrxRs and has a broader substrate-spectrum. On the other hand, Sec is easily targeted by electrophilic compounds which inhibits the TrxR activity and may turn TrxR into an NADPH oxidase. Ebselen, a synthetic seleno-compound containing selenazol, has been tested in several clinical studies. In mammalian cells, ebselen works as a GSH peroxidase mimic and mainly as a peroxiredoxin mimic via Trx and TrxR to scavenge hydrogen peroxide and peroxynitrite. In prokaryotic cells, ebselen is an inhibitor of TrxR and leads to elevation of reactive oxygen species (ROS). Recent studies have made use of the difference and developed ebselen as a potential antibiotic, especially in combination with silver which enables ebselen to kill multi-drug resistant Gram-negative bacteria. Collectively, Sec is important for the biological functions of mammalian TrxR and distinguishes it from prokaryotic TrxRs, therefore it is a promising drug target.
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Affiliation(s)
- Xiaoyuan Ren
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Lili Zou
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden; Translational Neuroscience & Neural Regeneration and Repair Institute/Institute of Cell Therapy, The First Hospital of Yichang, Three Gorges University, 443000 Yichang, China
| | - Jun Lu
- School of Pharmaceutical Sciences, Southwest University, 400715 Chongqing, China
| | - Arne Holmgren
- Division of Biochemistry, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, SE-171 77 Stockholm, Sweden.
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Mandeville A, Cock IE. Terminalia chebula Retz. Fruit Extracts Inhibit Bacterial Triggers of Some Autoimmune Diseases and Potentiate the Activity of Tetracycline. Indian J Microbiol 2018; 58:496-506. [PMID: 30262960 DOI: 10.1007/s12088-018-0754-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 07/07/2018] [Indexed: 12/25/2022] Open
Abstract
Terminalia chebula Retz. is a northern Indian plant species known for its anti-inflammatory and antimicrobial properties. T. chebula fruit powder was extracted with solvents of varying polarity and screened for bacterial growth inhibition by disc diffusion assay. The minimum inhibitory concentration (MIC) was quantified by both liquid dilution and disc diffusion techniques. To screen for combinatorial effects, the T. chebula fruit extracts were combined with a range of conventional antibiotics and tested against each bacteria using a liquid dilution assay. Where synergy was detected, the optimal ratios were determined using isobologram analysis. Toxicity was examined using Artemia nauplii and HDF bioassays. T. chebula fruit methanolic, aqueous and ethyl acetate extracts displayed strong antimicrobial activity against the bacterial triggers of all autoimmune inflammatory diseases except K. pneumoniae, for which only moderate inhibition was observed. Indeed, MIC values as low as 195 μg/mL were measured for the aqueous extract against a resistant strain of P. aeruginosa. Of further note, both the aqueous and ethyl acetate extracts interacted synergistically in combination with tetracycline against K. pneumoniae (Σ FIC 0.38 and 0.25 respectively). All extracts were nontoxic in the Artemia and HDF toxicity assays, further indicating their potential for medicinal use.
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Affiliation(s)
- Aaron Mandeville
- 1School of Natural Sciences, Nathan Campus, Griffith University, 170 Kessels Rd, Nathan, QLD 4111 Australia
| | - Ian Edwin Cock
- 1School of Natural Sciences, Nathan Campus, Griffith University, 170 Kessels Rd, Nathan, QLD 4111 Australia.,2Environmental Futures Research Institute, Nathan Campus, Griffith University, 170 Kessels Rd, Nathan, QLD 4111 Australia
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Fiore M, Maraolo AE, Gentile I, Borgia G, Leone S, Sansone P, Passavanti MB, Aurilio C, Pace MC. Current concepts and future strategies in the antimicrobial therapy of emerging Gram-positive spontaneous bacterial peritonitis. World J Hepatol 2017; 9:1166-1175. [PMID: 29109849 PMCID: PMC5666303 DOI: 10.4254/wjh.v9.i30.1166] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 08/03/2017] [Accepted: 09/16/2017] [Indexed: 02/06/2023] Open
Abstract
Spontaneous bacterial peritonitis (SBP) is the most common infection in end-stage liver disease patients. SBP is defined as an ascitic fluid infection with a polymorphonuclear leucocyte count ≥ 250/mm3 without an evident intra-abdominal surgically treatable source. Several mechanisms contribute to SBP occurrence, including translocation of gut bacteria and their products, reduced intestinal motility provoking bacterial overgrowth, alteration of the gut's barrier function and local immune responses. Historically, Gram-negative enteric bacteria have been the main causative agents of SBP, thereby guiding the empirical therapeutic choice. However, over the last decade, a worryingly increasing prevalence of Gram-positive and multi-drug resistant (MDR) SBP has been seen. Recently, the microbiological spectrum of SBP seems to have changed in Europe due to a high prevalence of Gram-positive bacteria (48%-62%). The overall proportion of MDR bacteria is up to 22%-73% of cases. Consequently, empirical therapy based on third-generation cephalosporins or amoxicillin/clavulanic acid, can no longer be considered the standard of care, as these drugs are associated with poor outcomes. The aim of this review is to describe, with an epidemiological focus, the evidence behind this rise in Gram-positive and MDR SBP from 2000 to present, and illustrate potential targeted therapeutic strategies. An appropriate treatment protocol should include daptomycin plus ceftaroline and meropenem, with prompt stepdown to a narrower spectrum when cultures and sensitivity data are available in order to reduce both cost and potential antibiotic resistance development.
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Affiliation(s)
- Marco Fiore
- Department of Anesthesiological, Surgical and Emergency Sciences, University of Campania "Luigi Vanvitelli", 80138 Naples, Italy.
| | - Alberto Enrico Maraolo
- Department of Clinical Medicine and Surgery, Section of Infectious Diseases, University of Naples Federico II, 80131 Naples, Italy
| | - Ivan Gentile
- Department of Clinical Medicine and Surgery, Section of Infectious Diseases, University of Naples Federico II, 80131 Naples, Italy
| | - Guglielmo Borgia
- Department of Clinical Medicine and Surgery, Section of Infectious Diseases, University of Naples Federico II, 80131 Naples, Italy
| | - Sebastiano Leone
- Division of Infectious Diseases, "San Giuseppe Moscati" Hospital, 83100 Avellino, Italy
| | - Pasquale Sansone
- Department of Anesthesiological, Surgical and Emergency Sciences, University of Campania "Luigi Vanvitelli", 80138 Naples, Italy
| | - Maria Beatrice Passavanti
- Department of Anesthesiological, Surgical and Emergency Sciences, University of Campania "Luigi Vanvitelli", 80138 Naples, Italy
| | - Caterina Aurilio
- Department of Anesthesiological, Surgical and Emergency Sciences, University of Campania "Luigi Vanvitelli", 80138 Naples, Italy
| | - Maria Caterina Pace
- Department of Anesthesiological, Surgical and Emergency Sciences, University of Campania "Luigi Vanvitelli", 80138 Naples, Italy
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Yeom JR, Yoon SU, Kim CG. Quantification of residual antibiotics in cow manure being spread over agricultural land and assessment of their behavioral effects on antibiotic resistant bacteria. Chemosphere 2017; 182:771-780. [PMID: 28535485 DOI: 10.1016/j.chemosphere.2017.05.084] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Revised: 05/09/2017] [Accepted: 05/13/2017] [Indexed: 06/07/2023]
Abstract
Antibiotic resistant bacteria (ARB) in livestock manure used as fertilizer and spread over agriculture land, may pose a threat to the health of humans. Considering this, the concentrations of tetracycline (TC), oxytetracycline (OTC), and sulfathiazole (STZ) in the surface soil were quantified using LC-MS. These antibiotics have been used in livestock and are found in fertilizer produced from livestock excretions. Species of ABR were identified using 16S rDNA. Soil samples were collected at depths of 0, 7, and 15 cm from farmland in Incheon (South Korea). In the surface soil, three compounds were detected: TC (17.74 μg/kg), OTC (0.78 μg/kg), and STZ (0.23 μg/kg). However, except for STZ, antibiotics were not detected in the deeper samples. Overall, TC can form a chelated complex with cations, which consequently enhances its adsorption to the organic matter and metals in soil. This property can significantly reduce the mobility of TC (to lower than that of STZ). The result of 16S rDNA gene analysis indicated that Pseudomonas spp., Arthrobacter spp., and Rhodococcus spp. showed persistent resistance to the three antibiotics tested. DNA quantification results revealed strong resistance of Pseudomonas spp. to STZ, whereas Arthrobacter spp. and Rhodococcus spp. had resistance to TC and OTC. Antibiotics biodegradation suggested ability of ARB to grow in soil samples in presence of residual antibiotics during 13 days incubation. The concentrations of STZ, TC, and OTC reduced as much as 23.53, 35.60 and 66.88%, respectively.
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Affiliation(s)
- Ji-Ran Yeom
- Department of Environment Engineering, INHA University, Incheon, South Korea
| | - Soon-Uk Yoon
- Department of Environment Engineering, INHA University, Incheon, South Korea
| | - Chang-Gyun Kim
- Department of Environment Engineering, INHA University, Incheon, South Korea.
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Grignolo S, Tatarelli P, Guolo F, Minetto P, Rivoli G, Guardo D, Del Bono V, Varaldo R, Gualandi F, Ballerini F, Raiola A, Gobbi M, Viscoli C, Mikulska M. Good tolerability of high dose colistin-based therapy in patients with haematological malignancies. Infection 2017; 45:505-511. [PMID: 28353153 DOI: 10.1007/s15010-017-1010-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Accepted: 03/17/2017] [Indexed: 10/19/2022]
Abstract
PURPOSE Colistin is usually the only drug fully active against multi-drug resistant Gram-negative bacteria, but its nephrotoxicity might limit its use. Recent pharmacokinetic/pharmacodynamic data suggest that high dose of colistin, preceded by a loading dose, are needed to maximize its antibacterial effect. The aim of this study was to determine the safety of high doses colistin, in haematology population. METHODS A retrospective review of haematology patients who received high dose colistin-based therapy in years 2011-2016 was performed. Nephrotoxicity was assessed using RIFLE criteria. RESULTS Thirty patients who received 38 courses of colistin were included in the study. Colistin was always administered together with other antibiotics. Colistin was well tolerated, with one case of neurological toxicity and one of cutaneous reaction. There were 22 (58%) treatment cycles without any nephrotoxicity, even though during 16 of these cycles other nephrotoxic drugs were administered. Severe (injury or failure) renal toxicity occurred during 6 (16%) treatment courses, requiring colistin discontinuation in 2 patients and colistin dose reduction in 1. Poorer renal function at baseline and younger age were the only variables associated with increased renal toxicity (p = 0.011 and p = 0.031, respectively). Overall mortality was 18% (7/38) and 29% (11/38) at 7 and 30 days after the treatment onset. CONCLUSIONS In adult haematology population, high dose colistin therapy is safe and efficacious, despite high frequency of concomitant nephrotoxic treatment.
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Affiliation(s)
- Sara Grignolo
- Division of Infectious Diseases, Department of Health Sciences (DISSAL), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy
| | - Paola Tatarelli
- Division of Infectious Diseases, Department of Health Sciences (DISSAL), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy.
| | - Fabio Guolo
- Chair of Hematology, Department of Internal Medicine (DiMI), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy
| | - Paola Minetto
- Chair of Hematology, Department of Internal Medicine (DiMI), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy
| | - Giulia Rivoli
- Chair of Hematology, Department of Internal Medicine (DiMI), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy
| | - Daniela Guardo
- Chair of Hematology, Department of Internal Medicine (DiMI), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy
| | - Valerio Del Bono
- Division of Infectious Diseases, Department of Health Sciences (DISSAL), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy
| | - Riccardo Varaldo
- Division of Hematology and Hematopoietic Stem Cell Transplantation Unit, IRCCS San Martino-IST, Genoa, Italy
| | - Francesca Gualandi
- Division of Hematology and Hematopoietic Stem Cell Transplantation Unit, IRCCS San Martino-IST, Genoa, Italy
| | - Filippo Ballerini
- Chair of Hematology, Department of Internal Medicine (DiMI), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy
| | - Annamaria Raiola
- Division of Hematology and Hematopoietic Stem Cell Transplantation Unit, IRCCS San Martino-IST, Genoa, Italy
| | - Marco Gobbi
- Chair of Hematology, Department of Internal Medicine (DiMI), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy
| | - Claudio Viscoli
- Division of Infectious Diseases, Department of Health Sciences (DISSAL), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy
| | - Malgorzata Mikulska
- Division of Infectious Diseases, Department of Health Sciences (DISSAL), IRCCS AOU San Martino-IST, University of Genoa, Genoa, Italy
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Russotto V, Cortegiani A, Raineri SM, Iozzo P, Gregoretti C, Giarratano A. What is the risk of acquiring bacteria from prior intensive care unit bed occupants? Crit Care 2017; 21:55. [PMID: 28327176 PMCID: PMC5361701 DOI: 10.1186/s13054-017-1652-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 02/28/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Vincenzo Russotto
- Department of Biopathology and Medical Biotechnologies (DIBIMED), Section of Anaesthesia, Analgesia, Intensive Care and Emergency, Policlinico Paolo Giaccone, University of Palermo, Via del Vespro 129, 90127, Palermo, Italy.
| | - Andrea Cortegiani
- Department of Biopathology and Medical Biotechnologies (DIBIMED), Section of Anaesthesia, Analgesia, Intensive Care and Emergency, Policlinico Paolo Giaccone, University of Palermo, Via del Vespro 129, 90127, Palermo, Italy
| | - Santi Maurizio Raineri
- Department of Biopathology and Medical Biotechnologies (DIBIMED), Section of Anaesthesia, Analgesia, Intensive Care and Emergency, Policlinico Paolo Giaccone, University of Palermo, Via del Vespro 129, 90127, Palermo, Italy
| | - Pasquale Iozzo
- Intensive Care Unit, Policlinico Paolo Giaccone, University of Palermo, Via del Vespro 129, 90127, Palermo, Italy
| | - Cesare Gregoretti
- Department of Biopathology and Medical Biotechnologies (DIBIMED), Section of Anaesthesia, Analgesia, Intensive Care and Emergency, Policlinico Paolo Giaccone, University of Palermo, Via del Vespro 129, 90127, Palermo, Italy
| | - Antonino Giarratano
- Department of Biopathology and Medical Biotechnologies (DIBIMED), Section of Anaesthesia, Analgesia, Intensive Care and Emergency, Policlinico Paolo Giaccone, University of Palermo, Via del Vespro 129, 90127, Palermo, Italy
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Möhler JS, Kolmar T, Synnatschke K, Hergert M, Wilson LA, Ramu S, Elliott AG, Blaskovich MAT, Sidjabat HE, Paterson DL, Schenk G, Cooper MA, Ziora ZM. Enhancement of antibiotic-activity through complexation with metal ions - Combined ITC, NMR, enzymatic and biological studies. J Inorg Biochem 2016; 167:134-141. [PMID: 27984786 DOI: 10.1016/j.jinorgbio.2016.11.028] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Revised: 10/17/2016] [Accepted: 11/22/2016] [Indexed: 02/01/2023]
Abstract
Alternative solutions need to be developed to overcome the growing problem of multi-drug resistant bacteria. This study explored the possibility of creating complexes of antibiotics with metal ions, thereby increasing their activity. Analytical techniques such as isothermal titration calorimetry and nuclear magnetic resonance were used to examine the structure and interactions between Cu(II), Ag(I) or Zn(II) and β-lactam antibiotics. The metal-β-lactam complexes were also tested for antimicrobial activity, by micro-broth dilution and disk diffusion methods, showing a synergistic increase in the activity of the drugs, and enzymatic inhibition assays confirming inhibition of β-lactamases responsible for resistance. The metal-antibiotic complex concept was proven to be successful with the activity of the drugs enhanced against β-lactamase-producing bacteria. The highest synergistic effects were observed for complexes formed with Ag(I).
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Affiliation(s)
- Jasper S Möhler
- The University of Queensland, School of Chemistry and Molecular Biosciences, St Lucia 4072, Australia
| | - Theresa Kolmar
- The University of Queensland, School of Chemistry and Molecular Biosciences, St Lucia 4072, Australia
| | - Kevin Synnatschke
- The University of Queensland, School of Chemistry and Molecular Biosciences, St Lucia 4072, Australia
| | - Marcel Hergert
- The University of Queensland, School of Chemistry and Molecular Biosciences, St Lucia 4072, Australia
| | - Liam A Wilson
- The University of Queensland, School of Chemistry and Molecular Biosciences, St Lucia 4072, Australia
| | - Soumya Ramu
- The University of Queensland, Institute for Molecular Bioscience, St Lucia 4072, Australia
| | - Alysha G Elliott
- The University of Queensland, Institute for Molecular Bioscience, St Lucia 4072, Australia
| | - Mark A T Blaskovich
- The University of Queensland, Institute for Molecular Bioscience, St Lucia 4072, Australia
| | - Hanna E Sidjabat
- The University of Queensland, UQ Centre for Clinical Research, Royal Brisbane and Women's Hospital, Brisbane, Queensland 4029, Australia
| | - David L Paterson
- The University of Queensland, UQ Centre for Clinical Research, Royal Brisbane and Women's Hospital, Brisbane, Queensland 4029, Australia
| | - Gerhard Schenk
- The University of Queensland, School of Chemistry and Molecular Biosciences, St Lucia 4072, Australia
| | - Matthew A Cooper
- The University of Queensland, Institute for Molecular Bioscience, St Lucia 4072, Australia
| | - Zyta M Ziora
- The University of Queensland, Institute for Molecular Bioscience, St Lucia 4072, Australia.
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Cimmino T, Le Page S, Raoult D, Rolain JM. Contemporary challenges and opportunities in the diagnosis and outbreak detection of multidrug-resistant infectious disease. Expert Rev Mol Diagn 2016; 16:1163-1175. [PMID: 27690721 DOI: 10.1080/14737159.2016.1244005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
INTRODUCTION The dissemination of multi-drug resistant bacteria (MDRB) has become a major public health concern worldwide because of the increase in infections caused by MDRB, the difficulty in treating them, and expenditures in patient care. Areas covered: We have reviewed challenges and contemporary opportunities for rapidly confronting infections caused by MDRB in the 21st century, including surveillance, detection, identification of resistance mechanisms, and action steps. Expert commentary: In this context, the first critical point for clinical microbiologists is to be able to rapidly detect an abnormal event, an outbreak and/or the spread of a MDRB with surveillance tools so that healthcare policies and therapies adapted to a new stochastic event that will certainly occur again in the future can be implemented.
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Affiliation(s)
- Teresa Cimmino
- a URMITE UM 63 CNRS 7278 IRD 198 INSERM U1905, IHU Méditerranée Infection, Faculté de Médecine et de Pharmacie , Aix-Marseille University , Marseille , France
| | - Stéphanie Le Page
- a URMITE UM 63 CNRS 7278 IRD 198 INSERM U1905, IHU Méditerranée Infection, Faculté de Médecine et de Pharmacie , Aix-Marseille University , Marseille , France
| | - Didier Raoult
- a URMITE UM 63 CNRS 7278 IRD 198 INSERM U1905, IHU Méditerranée Infection, Faculté de Médecine et de Pharmacie , Aix-Marseille University , Marseille , France
| | - Jean-Marc Rolain
- a URMITE UM 63 CNRS 7278 IRD 198 INSERM U1905, IHU Méditerranée Infection, Faculté de Médecine et de Pharmacie , Aix-Marseille University , Marseille , France
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Barksdale SM, Hrifko EJ, Chung EMC, van Hoek ML. Peptides from American alligator plasma are antimicrobial against multi-drug resistant bacterial pathogens including Acinetobacter baumannii. BMC Microbiol 2016; 16:189. [PMID: 27542832 PMCID: PMC4992317 DOI: 10.1186/s12866-016-0799-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 08/04/2016] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Our group has developed a new process for isolating and identifying novel cationic antimicrobial peptides from small amounts of biological samples. Previously, we identified several active antimicrobial peptides from 100 μl of plasma from Alligator mississippiensis. These peptides were found to have in vitro antimicrobial activity against Pseudomonas aeruginosa and Staphylococcus aureus. In this work, we further characterize three of the novel peptides discovered using this process: Apo5, Apo6, and A1P. RESULTS We examined the activity of these peptides against multi-drug resistant strains and clinical isolates of common human pathogens. We investigated their structural characteristics using circular dichroism and tested for membrane disruption and DNA binding. These peptides were found to have strong in vitro activity against multi-drug resistant and clinically isolated strains of S. aureus, Escherichia coli, P. aeruginosa, and Acinetobacter baumannii. Apo5 and Apo6, peptides derived from alligator apolipoprotein C-1, depolarized the bacterial membrane. A1P, a peptide from the serpin proteinase inhibitor, did not permeabilize membranes. Performing circular dichroism analysis, Apo5 and Apo6 were found to be predominantly helical in SDS and TFE buffer, while A1P has significantly different structures in phosphate buffer, SDS, and TFE. None of these peptides were found to be hemolytic to sheep red blood cells or significantly cytotoxic up to 100 μg/ml after 24 h exposure. CONCLUSIONS Overall, we suggest that Apo5 and Apo6 have a different mode of action than A1P, and that all three peptides make promising candidates for the treatment of drug-resistant bacteria, such as A. baumannii.
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Affiliation(s)
| | - Evelyn J Hrifko
- College of Science, George Mason University, Manassas, VA, USA
| | - Ezra Myung-Chul Chung
- National Center of Biodefense and Infectious Diseases, George Mason University, 10920 George Mason Cir, 10920 George Mason Circle, MSN 1H8, Manassas, VA, 20110, USA.,Present Address: STCube Pharmaceuticals, Inc., 401 Professional Dr. Suite 108, Gaithersburg, MD, 20879-3429, USA
| | - Monique L van Hoek
- School of Systems Biology, George Mason University, Manassas, VA, USA. .,National Center of Biodefense and Infectious Diseases, George Mason University, 10920 George Mason Cir, 10920 George Mason Circle, MSN 1H8, Manassas, VA, 20110, USA.
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Moreno Camacho A, Ruiz Camps I. [Nosocomial infection in patients receiving a solid organ transplant or haematopoietic stem cell transplant]. Enferm Infecc Microbiol Clin 2014; 32:386-95. [PMID: 24950613 PMCID: PMC7103322 DOI: 10.1016/j.eimc.2014.05.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Accepted: 05/27/2014] [Indexed: 12/25/2022]
Abstract
Bacterial infections are the most common infections in solid organ transplant recipients. These infections occur mainly in the first month after transplantation and are hospital-acquired. Nosocomial infections cause significant morbidity and are the most common cause of mortality in this early period of transplantation. These infections are caused by multi-drug resistant (MDR) microorganisms, mainly Gram-negative enterobacteria, non-fermentative Gram-negative bacilli, enterococci, and staphylococci. The patients at risk of developing nosocomial bacterial infections are those previously colonized with MDR bacteria while on the transplant waiting list. Intravascular catheters, the urinary tract, the lungs, and surgical wounds are the most frequent sources of infection. Preventive measures are the same as those applied in non-immunocompromised, hospitalized patients except in patients at high risk for developing fungal infection. These patients need antifungal therapy during their hospitalization, and for preventing some bacterial infections in the early transplant period, patients need vaccinations on the waiting list according to the current recommendations. Although morbidity and mortality related to infectious diseases have decreased during the last few years in haematopoietic stem cell transplant recipients, they are still one of the most important complications in this population. Furthermore, as occurs in the general population, the incidence of nosocomial infections has increased during the different phases of transplantation. It is difficult to establish general preventive measures in these patients, as there are many risk factors conditioning these infections. Firstly, they undergo multiple antibiotic treatments and interventions; secondly, there is a wide variability in the degree of neutropenia and immunosuppression among patients, and finally they combine hospital and home stay during the transplant process. However, some simple measures could be implemented to improve the current situation.
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Affiliation(s)
- Asunción Moreno Camacho
- Servicio de Enfermedades Infecciosas, Hospital Clínic-IDIBAPS, Universidad de Barcelona, Barcelona, España.
| | - Isabel Ruiz Camps
- Servicio de Enfermedades Infecciosas, Hospital Universitari Vall d'Hebron, Universidad Autónoma de Barcelona, Barcelona, España
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Radji M, Agustama RA, Elya B, Tjampakasari CR. Antimicrobial activity of green tea extract against isolates of methicillin-resistant Staphylococcus aureus and multi-drug resistant Pseudomonas aeruginosa. Asian Pac J Trop Biomed 2013; 3:663-7; discussion 666. [PMID: 23905026 DOI: 10.1016/s2221-1691(13)60133-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Accepted: 06/03/2013] [Indexed: 10/26/2022] Open
Abstract
OBJECTIVE To evaluate antibacterial activity of the Indonesian water soluble green tea extract, Camellia sinensis, against clinical isolates of methicillin-resistant Staphylococcus aureus (S. aureus) (MRSA) and multi-drug resistant Pseudomonas aeruginosa (MDR-P. aeruginosa). METHODS Antimicrobial activity of green tea extract was determined by the disc diffusion method and the minimum inhibitory concentration (MIC) was determined by the twofold serial broth dilutions method. The tested bacteria using in this study were the standard strains and multi-drug resistant clinical isolates of S. aureus and P. aeruginosa, obtained from Laboratory of Clinical Microbiology, Faculty of Medicine, University of Indonesia. RESULTS The results showed that the inhibition zone diameter of green tea extracts for S. aureus ATCC 25923 and MRSA were (18.970 ± 0.287) mm, and (19.130 ± 0.250) mm respectively. While the inhibition zone diameter for P. aeruginosa ATCC 27853 and MDR-P. aeruginosa were (17.550 ± 0.393) mm and (17.670 ± 0.398) mm respectively. The MIC of green tea extracts against S. aureus ATCC 25923 and MRSA were 400 µg/mL and 400 µg/mL, respectively, whereas the MIC for P. aeruginosa ATCC 27853 and MDR-P. aeruginosa were 800 µg/mL, and 800 µg/mL, respectively. CONCLUSIONS Camellia sinensis leaves extract could be useful in combating emerging drug-resistance caused by MRSA and P. aeruginosa.
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Affiliation(s)
- Maksum Radji
- Laboratory of Microbiology and Biotechnology, Faculty of Pharmacy, University of Indonesia, Depok 16424, Indonesia.
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