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Yildirim K, Simsek E, Kocak O, Bozkurt S, Koyuncu Ozyurt O, Coban AY. Resazurin microplate test method for rapid determination of colistin resistance in carbapenem-resistant Acinetobacter baumanii isolates. Lab Med 2024; 55:380-385. [PMID: 38007395 DOI: 10.1093/labmed/lmad099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2023] Open
Abstract
BACKGROUND Colistin-resistant Acinetobacter baumannii isolates are extremely important pathogens for hospital-acquired infections. OBJECTIVE To investigate the effectiveness of the resazurin microplate assay (REMA) for the rapid determination of colistin resistance. METHODS Susceptibility for colistin was investigated in vitro by the broth microdilution method (BMD) and the resazurin microplate assay (REMA) on 106 carbapenem-resistant Acinetobacter baumannii isolates. RESULTS The results of both test methods were compared, and the categorical agreement between them was found to be 100%. No minor, major, or very major discrepancy was observed between the 2 methods. CONCLUSIONS The most important advantages of REMA are that the results are obtained within 6 hours compared to the reference method, that it is easy to evaluate because it is colorimetric, and that the susceptibility result can be reported to the clinician on the same day as bacterial identification.
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Affiliation(s)
- Kubra Yildirim
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Akdeniz University, Antalya, Turkey
- Tuberculosis Research Center, Akdeniz University, Antalya, Turkey
| | - Ece Simsek
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Akdeniz University, Antalya, Turkey
- Tuberculosis Research Center, Akdeniz University, Antalya, Turkey
- Department of Medical Biotechnology, Institute of Health Sciences, Akdeniz University, Antalya, Turkey
| | - Orhan Kocak
- Tuberculosis Research Center, Akdeniz University, Antalya, Turkey
| | - Serhat Bozkurt
- Tuberculosis Research Center, Akdeniz University, Antalya, Turkey
| | - Ozlem Koyuncu Ozyurt
- Department of Medical Microbiology, Faculty of Medicine, Akdeniz University, Antalya, Turkey
| | - Ahmet Yilmaz Coban
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Akdeniz University, Antalya, Turkey
- Tuberculosis Research Center, Akdeniz University, Antalya, Turkey
- Department of Medical Biotechnology, Institute of Health Sciences, Akdeniz University, Antalya, Turkey
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Sychev AV, Lavrova AI, Dogonadze MZ, Postnikov EB. Establishing Compliance between Spectral, Colourimetric and Photometric Indicators in Resazurin Reduction Test. Bioengineering (Basel) 2023; 10:962. [PMID: 37627847 PMCID: PMC10451944 DOI: 10.3390/bioengineering10080962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 08/09/2023] [Accepted: 08/10/2023] [Indexed: 08/27/2023] Open
Abstract
The resazurin reduction test is one of the basic tests for bacterial culture viability and drug resistance endorsed by the World Health Organisation. At the same time, conventional spectrophotometric and spectrofluorimetric methods demand rather bulky and expensive equipment. This induces a challenge for developing simpler approaches to sensor systems that are portable and applicable in resource-limited settings. In this work, we address two such alternative approaches, based on the colour processing of the microbiological plate's photographic images and single-channel photometry with a recently developed portable microbiological analyser. The key results consist of establishing a sequential linear correspondence between the concentration of resorufin produced due to the reduction of resazurin by viable bacteria as determined by the UV-Vis studies, the intensity of the a* channel of the CIE L*a*b* colour space and the transmitted light intensity registered by a luxmeter under the LED illumination with a yellow colour filter. This route is illustrated with the chemical system "Hydrazine hydrate - resazurin", isolating the target colour change-inducing reaction and the test of determining the minimal inhibition concentration of the antibacterial first-line drug isoniazid acting on the culture of the H37Rv strain of M. tuberculosis.
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Affiliation(s)
- Alexander V. Sychev
- Research Center for Condensed Matter Physics, Kursk State University, Radishcheva St. 33, 305000 Kursk, Russia
| | - Anastasia I. Lavrova
- Saint-Petersburg State Research Institute of Phthisiopulmonology, Lygovsky av. 2-4, 191036 Saint-Petersburg, Russia
- Faculty of Medicine, Saint-Petersburg State University, Universitetskaya emb 7-9, 199034 Saint-Petersburg, Russia
| | - Marine Z. Dogonadze
- Saint-Petersburg State Research Institute of Phthisiopulmonology, Lygovsky av. 2-4, 191036 Saint-Petersburg, Russia
| | - Eugene B. Postnikov
- Department of Theoretical Physics, Kursk State University, Radishcheva St. 33, 305000 Kursk, Russia
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3
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A New Colorimetric Method for Rapid Detection of Antibiotic Resistance in Escherichia coli Isolates. Jundishapur J Microbiol 2022. [DOI: 10.5812/jjm.119858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background: The quick diagnosis and early initiation of antibiotic therapy in bacteria-induced infections is of paramount importance. Accordingly, the rapid identification of the causative agent, the short-term results of antibiotic sensitivity, the selection and use of right antibiotics for treatment further highlights the significance of this issue. Objectives: This study aimed to develop a new susceptibility testing method to provide rapid results in Escherichia coli clinical isolates and report the antibiotic susceptibility test results to clinicians in a short period. Methods: In the study, one hundred and ten E. coli clinical isolates were tested. In this regard, antibiotics recommended by the "Clinical and Laboratory Standards Institute (CLSI)" for testing the sensitivity of E. coli isolates, including amoxicillin-clavulanate, cefixime, ceftriaxone, ertapenem, ciprofloxacin, gentamicin, trimethoprim-sulfamethoxazole, and nitrofurantoin were tested. For quality control, E. coli ATCC25922, E. coli ATCC35218, Staphylococcus aureus ATCC29213, and E. coli 13846NTCC strains were used. The broth microdilution method recommended by CLSI was used as the reference method. Minimum inhibitory concentration values were determined, and antimicrobial susceptibilities were then determined according to the “European Committee on Antimicrobial Susceptibility Testing (EUCAST)” criteria. In the next phase, the results of the resazurin microplate method (RMM) were compared. Results: The comparison of the RMM developed in the present study with the reference method revealed that the calculated essential agreement ratios for eight antibiotics varied from 82.72 to 100%, and the categorical agreement values ranged from 95.45 to100%. Conclusions: According to the findings, the RMM results were highly in agreement with the results of the reference method. RMM allows the detection of antibiotic susceptibility quickly (e.g., within 5 hours) as such it is preferred, especially for laboratories with limited facilities. However, further multi-center studies are recommended to use this method in routine laboratories.
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Abstract
Tuberculosis (TB) is a major issue in global health and affects millions of people each year. Multidrug-resistant tuberculosis (MDR-TB) annually causes many deaths worldwide. Development of a way to diagnose and treat patients with MDR-TB can potentially reduce the incidence of the disease. The current study reviews the risk factors, pattern of progression, mechanism of resistance, and interaction between bacteria and the host immune system, which disrupts the immune response. It also targets the components of Mycobacterium tuberculosis (Mtb) and diagnosis and treatment options that could be available for clinical use in the near future. Mutations play an important role in development of MDR-TB and the selection of appropriate mutations can help to understand the type of resistance in patients to anti-TB drugs. In this way, they can be initially treated with proper and effective therapeutic choices, which can accelerate the course of treatment and improve patient health. Targeting the components and enzymes of Mtb is necessary for understanding bacterial survival and finding a way to destroy the pathogen and allow patients to recover faster and prevent the spread of disease, especially resistant strains.
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Affiliation(s)
- Majid Faridgohar
- Infectious Diseases Research Center, Kashan University of Medical Sciences, Kashan, Iran.,Department of Microbiology and Immunology, Faculty of Medicine, Kashan University of Medical Sciences, Kashan, Iran
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5
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Coban AY, Akbal AU, Ceyhan I, Uzun M, Sertel Selale D, Aslan G, Delialioglu N, Ozyurt M, Bektore B, Bicmen C, Aslanturk A, Ucarman N, Albay A, Sig AK, Ozkutuk N, Surucuoglu S. A new colorimetric method for rapid detection of ethambutol and streptomycin resistance in Mycobacterium tuberculosis: crystal violet decolorization assay (CVDA). Antonie van Leeuwenhoek 2018; 112:679-685. [PMID: 30417212 DOI: 10.1007/s10482-018-1198-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 11/02/2018] [Indexed: 10/27/2022]
Abstract
Streptomycin (STR) and ethambutol (EMB) are important drugs used for the treatment of tuberculosis. There is a need for fast, reliable and inexpensive methods for detecting resistance to these drugs. The aim of this study was to evaluate the performance of the crystal violet decolorization assay (CVDA) for the detection of STR and EMB resistance that is important drugs in tuberculosis treatment. In this study, drug susceptibility testing was performed on 140 Mycobacterium tuberculosis isolates provided from nine centers. Three tubes were used for each isolate. One of the tubes had a concentration of 2 mg/L STR and the other 5 mg/L EMB. The third was drug-free control tube. Sensitivity, specificity, positive predictive value (PPD), negative predictive value (NPD) and agreement for STR were found to be 81.8%, 94.6%, 87.8%, 91.5% and 90.57%, respectively. For EMB, sensitivity, specificity, PPD, NPD, and agreement were found to be 76%, 98.23%, 90.47%, 94.87% and 94.2%, respectively. The results were obtained in 11.3 ± 2.7 days (8-21 days). CVDA is rapid, reliable, inexpensive, and easy to perform for rapid detection of STR and EMB resistance, and it could be adapted for drug susceptibility testing.
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Affiliation(s)
- Ahmet Yilmaz Coban
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Akdeniz University, Antalya, Turkey.
| | - Ahmet Ugur Akbal
- Department of Medical Microbiology, Ondokuz Mayis University Medical School, Samsun, Turkey
| | - Ismail Ceyhan
- Medical Microbiology Laboratory, Ataturk Chest Disease and Chest Surgery Training and Research Hospital, Ankara, Turkey
| | - Meltem Uzun
- Department of Medical Microbiology, Istanbul Medical School, Istanbul University, Istanbul, Turkey
| | - Deniz Sertel Selale
- Department of Medical Microbiology, Istanbul Medical School, Istanbul University, Istanbul, Turkey
| | - Gonul Aslan
- Department of Medical Microbiology, Mersin University Medical School, Mersin, Turkey
| | - Nuran Delialioglu
- Department of Medical Microbiology, Mersin University Medical School, Mersin, Turkey
| | - Mustafa Ozyurt
- Department of Medical Microbiology, Sultan Abdulhamit Han Training and Research Hospital, Gulhane Medical School, Health Sciences University, Istanbul, Turkey
| | - Beyhan Bektore
- Department of Medical Microbiology, Sultan Abdulhamit Han Training and Research Hospital, Gulhane Medical School, Health Sciences University, Istanbul, Turkey
| | - Can Bicmen
- Medical Microbiology Laboratory, University of Health Sciences, Dr. Suat Seren Chest Diseases and Surgery Training and Research Hospital, Izmir, Turkey
| | - Ahmet Aslanturk
- Tuberculosis Reference Laboratory, Public Health Agency of Turkey, Ankara, Turkey
| | - Nilay Ucarman
- Tuberculosis Reference Laboratory, Public Health Agency of Turkey, Ankara, Turkey
| | - Ali Albay
- Department of Medical Microbiology, Gulhane Medical School, Health Sciences University, Ankara, Turkey
| | - Ali Korhan Sig
- Department of Medical Microbiology, Gulhane Medical School, Health Sciences University, Ankara, Turkey
| | - Nuri Ozkutuk
- Department of Medical Microbiology, Celal Bayar University Medical School, Manisa, Turkey
| | - Suheyla Surucuoglu
- Department of Medical Microbiology, Celal Bayar University Medical School, Manisa, Turkey
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6
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Optimizing the photocatalytic process of removing diazinon pesticide from aqueous solutions and effluent toxicity assessment via a response surface methodology approach. RENDICONTI LINCEI. SCIENZE FISICHE E NATURALI 2018. [DOI: 10.1007/s12210-018-0751-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Perdigão J, Silva C, Diniz J, Pereira C, Machado D, Ramos J, Silva H, Abilleira F, Brum C, Reis AJ, Macedo M, Scaini JL, Silva AB, Esteves L, Macedo R, Maltez F, Clemente S, Coelho E, Viegas S, Rabna P, Rodrigues A, Taveira N, Jordao L, Kritski A, Lapa E Silva JR, Mokrousov I, Couvin D, Rastogi N, Couto I, Pain A, McNerney R, Clark TG, von Groll A, Dalla-Costa ER, Rossetti ML, Silva PEA, Viveiros M, Portugal I. Clonal expansion across the seas as seen through CPLP-TB database: A joint effort in cataloguing Mycobacterium tuberculosis genetic diversity in Portuguese-speaking countries. INFECTION GENETICS AND EVOLUTION 2018; 72:44-58. [PMID: 29559379 PMCID: PMC6598853 DOI: 10.1016/j.meegid.2018.03.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 03/12/2018] [Accepted: 03/13/2018] [Indexed: 12/22/2022]
Abstract
Tuberculosis (TB) remains a major health problem within the Community of Portuguese Language Speaking Countries (CPLP). Despite the marked variation in TB incidence across its member-states and continued human migratory flux between countries, a considerable gap in the knowledge on the Mycobacterium tuberculosis population structure and strain circulation between the countries still exists. To address this, we have assembled and analysed the largest CPLP M. tuberculosis molecular and drug susceptibility dataset, comprised by a total of 1447 clinical isolates, including 423 multidrug-resistant isolates, from five CPLP countries. The data herein presented reinforces Latin American and Mediterranean (LAM) strains as the hallmark of M. tuberculosis populational structure in the CPLP coupled with country-specific differential prevalence of minor clades. Moreover, using high-resolution typing by 24-loci MIRU-VNTR, six cross-border genetic clusters were detected, thus supporting recent clonal expansion across the Lusophone space. To make this data available to the scientific community and public health authorities we developed CPLP-TB (available at http://cplp-tb.ff.ulisboa.pt), an online database coupled with web-based tools for exploratory data analysis. As a public health tool, it is expected to contribute to improved knowledge on the M. tuberculosis population structure and strain circulation within the CPLP, thus supporting the risk assessment of strain-specific trends. The Community of Portuguese Speaking Countries (CPLP) occupies a vast geographical area. Three CPLP countries are shortlisted in the WHO's list of Top 30 high-burden countries. Common Mycobacterium tuberculosis population structure denote historical strain flow. Cross-border clusters suggest recent intercontinental tuberculosis transmission. CPLP-TB: a novel strain database and framework for collaborative studies and strain tracing.
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Affiliation(s)
- João Perdigão
- iMed.ULisboa - Instituto de Investigação do Medicamento, Faculdade de Farmácia, Universidade de Lisboa, Lisboa, Portugal.
| | - Carla Silva
- iMed.ULisboa - Instituto de Investigação do Medicamento, Faculdade de Farmácia, Universidade de Lisboa, Lisboa, Portugal
| | - Jaciara Diniz
- Núcleo de Pesquisa em Microbiologia Médica, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Catarina Pereira
- iMed.ULisboa - Instituto de Investigação do Medicamento, Faculdade de Farmácia, Universidade de Lisboa, Lisboa, Portugal
| | - Diana Machado
- Unidade de Microbiologia Médica, Global Health and Tropical Medicine, GHTM, Instituto de Higiene e Medicina Tropical, IHMT, Universidade Nova de Lisboa, UNL, Lisboa, Portugal
| | - Jorge Ramos
- Unidade de Microbiologia Médica, Global Health and Tropical Medicine, GHTM, Instituto de Higiene e Medicina Tropical, IHMT, Universidade Nova de Lisboa, UNL, Lisboa, Portugal
| | - Hugo Silva
- iMed.ULisboa - Instituto de Investigação do Medicamento, Faculdade de Farmácia, Universidade de Lisboa, Lisboa, Portugal
| | - Fernanda Abilleira
- Núcleo de Pesquisa em Microbiologia Médica, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Clarice Brum
- Núcleo de Pesquisa em Microbiologia Médica, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Ana J Reis
- Núcleo de Pesquisa em Microbiologia Médica, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Maíra Macedo
- Núcleo de Pesquisa em Microbiologia Médica, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - João L Scaini
- Núcleo de Pesquisa em Microbiologia Médica, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Ana B Silva
- Núcleo de Pesquisa em Microbiologia Médica, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Leonardo Esteves
- Centro de Desenvolvimento Científico e Tecnológico (CDCT), Porto Alegre, Brazil
| | - Rita Macedo
- Departamento de Doenças Infecciosas, Instituto Nacional de Saúde Dr. Ricardo Jorge, Lisboa, Portugal
| | - Fernando Maltez
- Serviço de Doenças Infecciosas, Hospital de Curry Cabral, Lisboa, Portugal
| | - Sofia Clemente
- Hospital da Divina Providência, Serviço de Doenças Infecciosas, Luanda, Angola
| | - Elizabeth Coelho
- Programa Nacional de Controlo da Tuberculose, Ministério da Saúde de Moçambique, Mozambique
| | - Sofia Viegas
- Instituto Nacional de Saúde, Ministério da Saúde de Moçambique, Mozambique
| | - Paulo Rabna
- Instituto Nacional de Saúde Pública, Projecto de Saúde de Bandim (INASA/PSB), Bissau, Guinea-Bissau
| | - Amabélia Rodrigues
- Instituto Nacional de Saúde Pública, Projecto de Saúde de Bandim (INASA/PSB), Bissau, Guinea-Bissau
| | - Nuno Taveira
- iMed.ULisboa - Instituto de Investigação do Medicamento, Faculdade de Farmácia, Universidade de Lisboa, Lisboa, Portugal; Centro de Investigação Interdisciplinar Egas Moniz, Instituto Superior de Ciências da Saúde Egas Moniz, Monte de Caparica, Portugal
| | - Luísa Jordao
- Departamento de Doenças Infecciosas, Instituto Nacional de Saúde Dr. Ricardo Jorge, Lisboa, Portugal
| | - Afrânio Kritski
- Academic Tuberculosis Program, School of Medicine, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - José R Lapa E Silva
- Thoracic Diseases Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Igor Mokrousov
- Laboratory of Molecular Epidemiology and Evolutionary Genetics (former Laboratory of Molecular Microbiology), St. Petersburg Pasteur Institute, St. Petersburg, Russia
| | - David Couvin
- WHO Supranational TB Reference Laboratory, Tuberculosis and Mycobacteria Unit, Institut Pasteur de la Guadeloupe, Morne Jolivière Abymes, Guadeloupe, France
| | - Nalin Rastogi
- WHO Supranational TB Reference Laboratory, Tuberculosis and Mycobacteria Unit, Institut Pasteur de la Guadeloupe, Morne Jolivière Abymes, Guadeloupe, France
| | - Isabel Couto
- Unidade de Microbiologia Médica, Global Health and Tropical Medicine, GHTM, Instituto de Higiene e Medicina Tropical, IHMT, Universidade Nova de Lisboa, UNL, Lisboa, Portugal
| | - Arnab Pain
- Pathogen Genomics Laboratory, BESE Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Ruth McNerney
- Lung Infection and Immunity Unit, UCT Lung Institute, University of Cape Town, Groote Schuur Hospital, Observatory, 7925, Cape Town, South Africa
| | - Taane G Clark
- London School of Hygiene & Tropical Medicine, Keppel Street, London WC1E 7HT, United Kingdom
| | - Andrea von Groll
- Núcleo de Pesquisa em Microbiologia Médica, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Elis R Dalla-Costa
- Centro de Desenvolvimento Científico e Tecnológico (CDCT), Porto Alegre, Brazil
| | - Maria Lúcia Rossetti
- Centro de Desenvolvimento Científico e Tecnológico (CDCT), Porto Alegre, Brazil; Universidade Luterana do Brasil (ULBRA/RS), Porto Alegre, Brazil
| | - Pedro E A Silva
- Núcleo de Pesquisa em Microbiologia Médica, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Rio Grande do Sul, Brazil
| | - Miguel Viveiros
- Unidade de Microbiologia Médica, Global Health and Tropical Medicine, GHTM, Instituto de Higiene e Medicina Tropical, IHMT, Universidade Nova de Lisboa, UNL, Lisboa, Portugal
| | - Isabel Portugal
- iMed.ULisboa - Instituto de Investigação do Medicamento, Faculdade de Farmácia, Universidade de Lisboa, Lisboa, Portugal.
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Malm S, Maaß S, Schaible UE, Ehlers S, Niemann S. In vivo virulence of Mycobacterium tuberculosis depends on a single homologue of the LytR-CpsA-Psr proteins. Sci Rep 2018; 8:3936. [PMID: 29500450 PMCID: PMC5834633 DOI: 10.1038/s41598-018-22012-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 02/12/2018] [Indexed: 12/27/2022] Open
Abstract
LytR-cpsA-Psr (LCP) domain containing proteins fulfil important functions in bacterial cell wall synthesis. In Mycobacterium tuberculosis complex (Mtbc) strains, the causative agents of tuberculosis (TB), the genes Rv3484 and Rv3267 encode for LCP proteins which are putatively involved in arabinogalactan transfer to peptidoglycan. To evaluate the significance of Rv3484 for Mtbc virulence, we generated a deletion mutant in the Mtbc strain H37Rv and studied its survival in mice upon aerosol infection. The deletion mutant failed to establish infection demonstrating that Rv3484 is essential for growth in mice. Following an initial phase of marginal replication in the lungs until day 21, the Rv3484 deletion mutant was almost eliminated by day 180 post-infectionem. Interestingly, the mutant also showed higher levels of resistance to meropenem/clavulanate and lysozyme, both targeting peptidoglycan structure. We conclude that Rv3484 is essential for Mtbc virulence in vivo where its loss of function cannot be compensated by Rv3267.
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Affiliation(s)
- S Malm
- Molecular and Experimental Mycobacteriology, Priority Area Infections, Research Center Borstel - Leibniz Center for Medicine and Biosciences, 23845, Borstel, Germany.
| | - S Maaß
- Molecular and Experimental Mycobacteriology, Priority Area Infections, Research Center Borstel - Leibniz Center for Medicine and Biosciences, 23845, Borstel, Germany
| | - U E Schaible
- Cellular Microbiology, Priority Area Infections, Research Center Borstel - Leibniz Center for Medicine and Biosciences, 23845, Borstel, Germany
| | - S Ehlers
- Molecular Inflammation Medicine, Priority Area Infections, Research Center Borstel - Leibniz Center for Medicine and Biosciences, 23845, Borstel, Germany
| | - S Niemann
- Molecular and Experimental Mycobacteriology, Priority Area Infections, Research Center Borstel - Leibniz Center for Medicine and Biosciences, 23845, Borstel, Germany
- German Center for Infection Research, Borstel Site, Borstel, Germany
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9
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Csepregi R, Lemli B, Kunsági-Máté S, Szente L, Kőszegi T, Németi B, Poór M. Complex Formation of Resorufin and Resazurin with Β-Cyclodextrins: Can Cyclodextrins Interfere with a Resazurin Cell Viability Assay? Molecules 2018; 23:molecules23020382. [PMID: 29439432 PMCID: PMC6017802 DOI: 10.3390/molecules23020382] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 02/07/2018] [Accepted: 02/08/2018] [Indexed: 01/15/2023] Open
Abstract
Resazurin (or Alamar Blue) is a poorly fluorescent dye. During the cellular reduction of resazurin, its highly fluorescent product resorufin is formed. Resazurin assay is a commonly applied method to investigate viability of bacterial and mammalian cells. In this study, the interaction of resazurin and resorufin with β-cyclodextrins was investigated employing spectroscopic and molecular modeling studies. Furthermore, the influence of β-cyclodextrins on resazurin-based cell viability assay was also tested. Both resazurin and resorufin form stable complexes with the examined β-cyclodextrins (2.0–3.1 × 103 and 1.3–1.8 × 103 L/mol were determined as binding constants, respectively). Cells were incubated for 30 and 120 min and treated with resazurin and/or β-cyclodextrins. Our results suggest that cyclodextrins are able to interfere with the resazurin-based cell viability assay that presumably results from the following mechanisms: (1) inhibition of the cellular uptake of resazurin and (2) enhancement of the fluorescence signal of the formed resorufin.
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Affiliation(s)
- Rita Csepregi
- Department of Laboratory Medicine, University of Pécs, Medical School, Pécs H-7624, Hungary; (R.C.); (T.K.)
- János Szentágothai Research Center, University of Pécs, Pécs H-7624, Hungary; (B.L.); (S.K.-M.)
| | - Beáta Lemli
- János Szentágothai Research Center, University of Pécs, Pécs H-7624, Hungary; (B.L.); (S.K.-M.)
- Department of General and Physical Chemistry, University of Pécs, Pécs H-7624, Hungary
- Department of Pharmaceutical Chemistry, University of Pécs, Faculty of Pharmacy, Pécs H-7624, Hungary
| | - Sándor Kunsági-Máté
- János Szentágothai Research Center, University of Pécs, Pécs H-7624, Hungary; (B.L.); (S.K.-M.)
- Department of General and Physical Chemistry, University of Pécs, Pécs H-7624, Hungary
- Department of Pharmaceutical Chemistry, University of Pécs, Faculty of Pharmacy, Pécs H-7624, Hungary
| | - Lajos Szente
- CycloLab Cyclodextrin Research & Development Laboratory, Ltd., Budapest H-1097, Hungary;
| | - Tamás Kőszegi
- Department of Laboratory Medicine, University of Pécs, Medical School, Pécs H-7624, Hungary; (R.C.); (T.K.)
- János Szentágothai Research Center, University of Pécs, Pécs H-7624, Hungary; (B.L.); (S.K.-M.)
| | - Balázs Németi
- Department of Pharmacology, University of Pécs, Faculty of Pharmacy, Pécs H-7624, Hungary;
| | - Miklós Poór
- János Szentágothai Research Center, University of Pécs, Pécs H-7624, Hungary; (B.L.); (S.K.-M.)
- Department of Pharmacology, University of Pécs, Faculty of Pharmacy, Pécs H-7624, Hungary;
- Correspondence: ; Tel.: +36-72-536-000 (ext. 31646)
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10
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Kumar K, Giribhattanavar P, Sagar C, Patil S. A rapid and simple resazurin assay to detect minimum inhibitory concentrations of first-line drugs for Mycobacterium tuberculosis isolated from cerebrospinal fluid. J Glob Antimicrob Resist 2017; 12:157-161. [PMID: 28964954 DOI: 10.1016/j.jgar.2017.09.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 07/13/2017] [Accepted: 09/20/2017] [Indexed: 10/18/2022] Open
Abstract
OBJECTIVES Central nervous system tuberculosis (CNS-TB) is a devastating manifestation of TB. The most common form of CNS-TB is tuberculous meningitis. Drug-resistant TB poses a major threat to the control of TB worldwide. Timely treatment dramatically improves the outcome. Colorimetric techniques for drug susceptibility testing based on the oxidation-reduction principle give results quick and are less expensive. The objectives of this study were to compare the susceptibility of Mycobacterium tuberculosis isolated from cerebrospinal fluid to four first-line drugs using the MGIT automated mycobacterial detection system and the resazurin assay (RA) as well as to estimate the minimum inhibitory concentrations (MICs) by RA. METHODS A total of 42 M. tuberculosis isolates were analysed for their susceptibilities by MGIT and RA. RESULTS Of the 42 isolates, 35 gave concordant results with both methods. Agreement between the two tests for streptomycin and rifampicin was 100% with a Fleiss' kappa (κ) value of 1, whereas for isoniazid and ethambutol agreement was 92.86% and 90.48%, respectively, with κ values of 0.853 and 0.738. CONCLUSION The RA appears to be a good alternative to the automated MGIT technique in resource-limited settings.
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Affiliation(s)
- Kavitha Kumar
- Department of Neuromicrobiology, National Institute of Mental Health and Neurosciences (NIMHANS), Hosur Road, Bengaluru, Karnataka 560029, India
| | - Prashant Giribhattanavar
- Department of Neuromicrobiology, National Institute of Mental Health and Neurosciences (NIMHANS), Hosur Road, Bengaluru, Karnataka 560029, India
| | - Chandrasekhar Sagar
- Department of Neuropathology, National Institute of Mental Health and Neurosciences (NIMHANS), Hosur Road, Bengaluru, Karnataka 560029, India.
| | - Shripad Patil
- Department of Neuromicrobiology, National Institute of Mental Health and Neurosciences (NIMHANS), Hosur Road, Bengaluru, Karnataka 560029, India.
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Coban AY, Akbal AU, Uzun M, Cayci YT, Birinci A, Durupinar B. Evaluation of crystal violet decolorization assay for minimal inhibitory concentration detection of primary antituberculosis drugs against Mycobacterium tuberculosis isolates. Mem Inst Oswaldo Cruz 2017; 0:0. [PMID: 27304025 PMCID: PMC4957498 DOI: 10.1590/0074-02760160082] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 05/18/2016] [Indexed: 11/21/2022] Open
Abstract
In this study we evaluated the crystal violet decolorization assay (CVDA) for detection of minimum inhibitory concentration (MIC) of antituberculosis drugs. 53 isolates were tested in this study and 13 of them were multidrug resistant (MDR) isolates. The antibiotics concentrations were 2-0.06 mg/L for isoniazid (INH) and rifampicin (RIF) and were 16-0.25 mg/L for streptomycin (STM) and ethambutol (EMB). Crystal violet (CV-25 mg/L) was added into the microwells on the seventh day of incubation and incubation was continued until decolorization. Decolorization of CV was the predictor of bacterial growth. Overall agreements for four drugs were detected as 98.1%, and the average time was detected as 9.5 ± 0.89 day after inoculation. One isolate for INH and two isolates for STM were determined resistant in the reference method, but susceptible by the CVDA. One isolate was susceptible to EMB by the reference method, but resistant by the CVDA. All results were concordant for RIF. This study shows that CVDA is a rapid, reliable and suitable for determination of MIC values of Mycobacterium tuberculosis. And it can be used easily especially in countries with limited-sources.
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Affiliation(s)
- Ahmet Yilmaz Coban
- Ondokuz Mayis University, Ondokuz Mayis University, Medical School, Department of Medical Microbiology, Samsun , Turkey, Ondokuz Mayis University Medical School, Department of Medical Microbiology, Samsun, Turkey
| | - Ahmet Ugur Akbal
- Ondokuz Mayis University, Ondokuz Mayis University, Medical School, Department of Medical Microbiology, Samsun , Turkey, Ondokuz Mayis University Medical School, Department of Medical Microbiology, Samsun, Turkey
| | - Meltem Uzun
- Istanbul University, Istanbul University, Istanbul Medical School, Department of Medical Microbiology, Istanbul , Turkey, Istanbul University Istanbul Medical School, Department of Medical Microbiology, Istanbul, Turkey
| | - Yeliz Tanriverdi Cayci
- Ondokuz Mayis University, Ondokuz Mayis University, Medical School, Department of Medical Microbiology, Samsun , Turkey, Ondokuz Mayis University Medical School, Department of Medical Microbiology, Samsun, Turkey
| | - Asuman Birinci
- Ondokuz Mayis University, Ondokuz Mayis University, Medical School, Department of Medical Microbiology, Samsun , Turkey, Ondokuz Mayis University Medical School, Department of Medical Microbiology, Samsun, Turkey
| | - Belma Durupinar
- Ondokuz Mayis University, Ondokuz Mayis University, Medical School, Department of Medical Microbiology, Samsun , Turkey, Ondokuz Mayis University Medical School, Department of Medical Microbiology, Samsun, Turkey
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12
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Coban AY, Akbal AU, Bicmen C, Albay A, Sig AK, Uzun M, Selale DS, Ozkutuk N, Surucuoglu S, Albayrak N, Ucarman N, Ozkutuk A, Esen N, Ceyhan I, Ozyurt M, Bektore B, Aslan G, Delialioğlu N, Alp A. Multicenter evaluation of crystal violet decolorization assay (CVDA) for rapid detection of isoniazid and rifampicin resistance in Mycobacterium tuberculosis. Sci Rep 2016; 6:39050. [PMID: 27982061 PMCID: PMC5159858 DOI: 10.1038/srep39050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 11/10/2016] [Indexed: 11/25/2022] Open
Abstract
The aim of this multicenter study was to evaluate the performance of the crystal violet decolorization assay (CVDA) for detection of multidrug resistant tuberculosis (MDR-TB). This study was performed in 11 centers in two phases. A total of 156 isolates were tested for INH and RIF resistance. In the phase I, 106 clinical isolates were tested in the Center 1–7. In the phase 2, 156 clinical isolates were tested in the center 1–6, center 8–11. Eighty six of 156 tested isolates were the same in phase I. Agreements were 96.2–96.8% for INH and 98.1–98.7% for RIF in the phase I-II, respectively. Mean time to obtain the results in the phase I was 14.3 ± 5.4 days. In the phase II, mean time to obtain the results was 11.6 ± 3.5 days. Test results were obtained within 14days for 62.3% (66/106) of isolates in the phase I and 81.4% (127/156) of isolates in the phase II. In conclusion, CVDA is rapid, reliable, inexpensive, and easy to perform for rapid detection of MDR-TB isolates. In addition, it could be adapted for drug susceptibility testing with all drugs both in developed and developing countries.
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Affiliation(s)
- Ahmet Yilmaz Coban
- Ondokuz Mayis University Medical School Department of Medical Microbiology, Samsun, Turkey
| | - Ahmet Ugur Akbal
- Ondokuz Mayis University Medical School Department of Medical Microbiology, Samsun, Turkey
| | - Can Bicmen
- Dr. Suat Seren Chest Diseases and Chest Surgery Training and Research Hospital, Medical Microbiology Laboratory, Izmir, Turkey
| | - Ali Albay
- Gulhane Military Medical Academy, Department of Medical Microbiology, Ankara, Turkey
| | - Ali Korhan Sig
- Gulhane Military Medical Academy, Department of Medical Microbiology, Ankara, Turkey
| | - Meltem Uzun
- Istanbul University Istanbul Medical School Department of Medical Microbiology, Istanbul, Turkey
| | - Deniz Sertel Selale
- Istanbul University Istanbul Medical School Department of Medical Microbiology, Istanbul, Turkey
| | - Nuri Ozkutuk
- Celal Bayar University Medical School Department of Medical Microbiology, Manisa, Turkey
| | - Suheyla Surucuoglu
- Celal Bayar University Medical School Department of Medical Microbiology, Manisa, Turkey
| | - Nurhan Albayrak
- Public Health Agency of Turkey Tuberculosis Reference Laboratory, Ankara, Turkey
| | - Nilay Ucarman
- Public Health Agency of Turkey Tuberculosis Reference Laboratory, Ankara, Turkey
| | - Aydan Ozkutuk
- Dokuz Eylul University Medical School Department of Medical Microbiology, Izmir, Turkey
| | - Nuran Esen
- Dokuz Eylul University Medical School Department of Medical Microbiology, Izmir, Turkey
| | - Ismail Ceyhan
- Atatürk Chest Diseases and Chest Surgery Training and Research Hospital Medical Microbiology Laboratory, Ankara, Turkey
| | - Mustafa Ozyurt
- Haydarpasa Military Medical Academy, Department of Medical Microbiology, Istanbul, Turkey
| | - Bayhan Bektore
- Haydarpasa Military Medical Academy, Department of Medical Microbiology, Istanbul, Turkey
| | - Gonul Aslan
- Mersin University Medical School Department of Medical Microbiology, Mersin, Turkey
| | - Nuran Delialioğlu
- Mersin University Medical School Department of Medical Microbiology, Mersin, Turkey
| | - Alpaslan Alp
- Hacettepe University Medical School Department of Medical Microbiology, Ankara, Turkey
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13
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Rodrigues-Junior VS, Villela AD, Gonçalves RS, Abbadi BL, Trindade RV, López-Gavín A, Tudó G, González-Martín J, Basso LA, de Souza MV, Campos MM, Santos DS. Mefloquine and its oxazolidine derivative compound are active against drug-resistant Mycobacterium tuberculosis strains and in a murine model of tuberculosis infection. Int J Antimicrob Agents 2016; 48:203-7. [DOI: 10.1016/j.ijantimicag.2016.04.029] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 04/14/2016] [Accepted: 04/16/2016] [Indexed: 12/30/2022]
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14
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Ishikawa AA, Salazar JV, Salinas M, Gaitani CM, Nurkiewicz T, Negrete GR, Garcia CD. Self-Assembled Nanospheres for Encapsulation and Aerosolization of Rifampicin. RSC Adv 2016; 6:12959-12963. [PMID: 26998252 DOI: 10.1039/c5ra25044g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Rifampicin (RIF) is a benchmark drug for treatment of tuberculosis, but poor bioavailability, prolonged treatment, and pill burden have been linked to therapeutic failure and the development of multidrug resistant strains. To overcome these limitations, this study investigated a method of rifampicin nanoencapsulation and aerosol delivery using a commercial, hand-held nebulizer modified with a nitrogen stream.
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Affiliation(s)
- Aline A Ishikawa
- School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirao Preto, SP, Brazil; Department of Chemistry, Clemson University, Clemson, SC 29634, USA
| | - Jesus V Salazar
- Department of Physics and Astronomy, UT San Antonio, San Antonio, TX, USA
| | - Magaly Salinas
- Department of Chemistry, UT San Antonio, San Antonio, TX, USA
| | - Cristiane M Gaitani
- School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirao Preto, SP, Brazil
| | - Timothy Nurkiewicz
- Department of Physiology & Pharmacology, Center for Cardiovascular & Respiratory Sciences, Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, WV, USA
| | | | - Carlos D Garcia
- Department of Chemistry, Clemson University, Clemson, SC 29634, USA
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