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Szemraj M, Glajzner P, Sienkiewicz M. Decreased susceptibility to vancomycin and other mechanisms of resistance to antibiotics in Staphylococcus epidermidis as a therapeutic problem in hospital treatment. Sci Rep 2023; 13:13629. [PMID: 37604965 PMCID: PMC10442409 DOI: 10.1038/s41598-023-40866-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 08/17/2023] [Indexed: 08/23/2023] Open
Abstract
Multidrug-resistant coagulase-negative staphylococci represent a real therapeutic challenge. The aim of the study was to emphasize the importance of heteroresistance to vancomycin presence in methicillin-resistant strains of S. epidermidis. The research comprised 65 strains of S. epidermidis. Heteroresistance to vancomycin was detected with the use of the agar screening method with Brain Heart Infusion and a population profile analysis (PAP test). In addition, types of cassettes and genes responsible for resistance to antibiotics for 22 multidrug resistant strains were determined. Our investigations showed that 56 of 65 S. epidermidis strains were phenotypically resistant to methicillin. The tested strains were mostly resistant to erythromycin, gentamicin, clindamycin, and ciprofloxacin. Six strains showed decreased susceptibility to vancomycin and their heterogeneous resistance profiles were confirmed with the PAP test. All tested multi-resistant strains exhibited the mecA gene. More than half of them possessed type IV cassettes. ant(4')-Ia and aac(6')/aph(2''), ermC and tetK genes were most commonly found. The described phenomenon of heteroresistance to vancomycin in multidrug resistant bacteria of the Staphylococcus genus effectively inhibits a therapeutic effect of treatment with this antibiotic. That is why it is so important to search for markers that will enable to identify heteroresistance to vancomycin strains under laboratory conditions.
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Affiliation(s)
- Magdalena Szemraj
- Department of Pharmaceutical Microbiology and Microbiological Diagnostic, Medical University of Lodz, Lodz, Poland.
| | - Paulina Glajzner
- Department of Pharmaceutical Microbiology and Microbiological Diagnostic, Medical University of Lodz, Lodz, Poland
| | - Monika Sienkiewicz
- Department of Pharmaceutical Microbiology and Microbiological Diagnostic, Medical University of Lodz, Lodz, Poland
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Rey J, Gil M, de Mendoza JH, García A, Gaitskell-Phillips G, Bastidas-Caldes C, Zalama L. Clonality and Persistence of Multiresistant Methicillin-Resistant Coagulase-Negative Staphylococci Isolated from the Staff of a University Veterinary Hospital. Antibiotics (Basel) 2022; 11:antibiotics11060811. [PMID: 35740217 PMCID: PMC9220325 DOI: 10.3390/antibiotics11060811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 06/13/2022] [Accepted: 06/14/2022] [Indexed: 11/25/2022] Open
Abstract
The aim of this study was to characterize methicillin-resistant coagulase-negative staphylococci (MRCoNS) isolates from the healthy staff of a university veterinary hospital in order to assess their importance as a reservoir of antimicrobial resistance and to determine their population structure and evolution. The study duration was over two years (2020–2021), 94 individuals were analyzed in duplicate, and 78 strains were obtained. The overall prevalence of methicillin-resistant strains detected throughout the study was 61.7%, with point prevalence values of 53.2% in 2020 and 31.5% in 2021. A total of 19.1% of the individuals analyzed were carriers throughout the study. The most frequently identified MRCoNs were Staphylococcus epidermidis (92.3%) and S. warneri (3.8%). A total of 75.6% of the isolates obtained showed the development of multi-resistance, preferentially against erythromycin, gentamicin, and tetracycline, and to a lesser extent against fusidic acid, norfloxacin, and clindamycin; these antimicrobials are frequently used in the veterinary field. Although most of the S. epidermidis isolates obtained showed wide genetic variability and low dispersion, which are characteristic of community-associated isolates, a small number of strains spread between individuals in close physical proximity and were maintained over time, forming stable clones. These clones generally maintained the same type of staphylococcal cassette chromosome mec (SCCmec) and had a similar antimicrobial resistance pattern.
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Affiliation(s)
- Joaquín Rey
- Unidad de Patología Infecciosa y Epidemiología, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain; (M.G.); (J.H.d.M.); (L.Z.)
- Correspondence:
| | - María Gil
- Unidad de Patología Infecciosa y Epidemiología, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain; (M.G.); (J.H.d.M.); (L.Z.)
| | - Javier Hermoso de Mendoza
- Unidad de Patología Infecciosa y Epidemiología, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain; (M.G.); (J.H.d.M.); (L.Z.)
| | - Alfredo García
- Área de Producción Animal, CICYTEX-La Orden, 06187 Badajoz, Spain;
| | - Gemma Gaitskell-Phillips
- Unidad de Reproducción y Obstetricia, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain;
| | - Carlos Bastidas-Caldes
- One Health Group, Facultad de Ingeniería y Ciencias Aplicadas (FICA), Biotecnología, Universidad de las Américas (UDLA), Quito 170125, Ecuador;
| | - Laura Zalama
- Unidad de Patología Infecciosa y Epidemiología, Facultad de Veterinaria, Universidad de Extremadura, 10003 Cáceres, Spain; (M.G.); (J.H.d.M.); (L.Z.)
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Behshood P, Tajbakhsh E, Momtaz H. Recognition of (Sesc) for Easy Identification of Staphylococcus Epidermidis and Molecular and Phenotypic Study of Β-Lactam Resistance in Staphylococcus Epidermidis Isolates in Isfahan. Rep Biochem Mol Biol 2020; 9:309-314. [PMID: 33649724 DOI: 10.29252/rbmb.9.3.309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Background Not only is it crucial to rapidly detect Staphylococcus epidermidis (S. epidermidis) isolates from a broad range of bacteria, but recognizing resistance agents can greatly improve current diagnostic and therapeutic strategies. Methods The current cross-sectional study investigated 120 clinical isolates from a nosocomial S. epidermidis infection. The isolates were identified using common biochemical tests, and specific S. epidermidis surface protein C (SesC) primers were used to confirm the presence of S. epidermidis. PCR and special primers were used to detect the β-lactamase gene (blaZ). Methicillin resistance was measured using the agar screening method and antibiotic susceptibility was measured by disk diffusion. Results 100 samples were characterized as S. epidermidis using a phenotypic and genotypic methods. From the 100 specimens examined, 80% contained blaZ. According to agar screening, 60% of isolates were methicillin-resistant. S. epidermidis isolates demonstrated the highest resistance to penicillin (93%) and the highest sensitivity to cefazolin (39%). Conclusion The increased resistance to β-lactam antibiotics in S. epidermidis isolates is alarming, and certain precautions should be taken by healthcare systems to continuously monitor the antimicrobial pattern of S. epidermidis, so that an appropriate drug treatment can be established.
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Affiliation(s)
- Parisa Behshood
- Department of Microbiology, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
| | - Elahe Tajbakhsh
- Department of Microbiology, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
| | - Hassan Momtaz
- Department of Microbiology, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
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Incidence and characteristics of methicillin-resistant coagulase-negative Staphylococcus aureus in peritoneal dialysis-associated peritonitis in a single center using molecular methods. Int Urol Nephrol 2020; 53:373-380. [PMID: 32804344 DOI: 10.1007/s11255-020-02605-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 08/06/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE Peritonitis is a serious complication of peritoneal dialysis and coagulase-negative Staphylococcus (CNS) is the most frequent cause of peritoneal dialysis (PD)-infections in many centers. This study aimed to investigate the molecular epidemiology of CNS isolated from PD-peritonitis in a Brazilian single center, focusing on the genetic determinants conferring methicillin resistance. METHODS Bacterial strains were isolated from peritoneal fluid of patients presenting PD-peritonitis, identified by phenotypic and molecular methods, and those identified as CNS were submitted to mecA detection, SCCmec, pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST). RESULTS Over the 18-year period of this study (1995-2011), a total of 878 peritonitis episodes were diagnosed in this unit, 115 were caused by coagulase-negative staphylococci of which 72 by Staphylococcus epidermidis. mecA gene was detected in 55 CNS (47.8%), more frequently on the more recent years. SCCmec type III was the most frequent cassette, followed by SCCmec type IV and SCCmec type II. A diverstity of pulsotypes was observed among the S. epidermidis isolates, but five clusters (based on the 80% cutoff) were identified. Diversified sequence types (ST02, ST05, ST06, ST09, ST23, ST59 and ST371) were detected. CONCLUSIONS Detection of SCCmec type III among coagulase-negative Staphylococcus underscores the role of hospital environments as potential source of methicillin-resistant Staphylococcus causing peritonitis in PD patients.
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Miyahira RF, Santos EA, Leão RS, de Freitas-Almeida AC, Queiroz ML. Antimicrobial Susceptibility and Enterotoxin-Encoding Genes in Staphylococcus spp. Recovered from Kitchen Equipment from a University Hospital in Rio de Janeiro, Brazil. Microb Drug Resist 2018; 24:995-1001. [PMID: 29653479 DOI: 10.1089/mdr.2016.0309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
This study was conducted to determine the occurrence of antimicrobial resistance and enterotoxin-encoding genes (EEGs) in Staphylococcus spp. recovered from equipment used to prepare hospital meals, in a university hospital in Rio de Janeiro, Brazil. Sixty samples were collected from semi-industrial equipment (one blender and one mixer) in the hospital's kitchen. Resistance genes and SCCmec types were detected by PCR. From the 40 isolates of Staphylococcus spp. identified, 8 were Staphylococcus aureus. Thirty-two (80%) Staphylococcus spp. isolates were resistant to at least one antimicrobial agent. Resistance genetic determinants were detected: erm gene (Staphylococcus epidermidis [n = 2]; Staphylococcus hominis [n = 1]), mecA gene (S. epidermidis [n = 2]), and aa(6')-aph(2'') gene (Staphylococcus caprae [n = 1], S. epidermidis [n = 2], S. hominis [n = 1], Staphylococcus pausteri [n = 1], Staphylococcus simulans [n = 1], and Staphylococcus warneri [n = 1]). The presence of at least one EEG in 83% (n = 33) of the isolates was identified. Two strains of S. epidermidis were methicillin-resistant S. epidermidis (MRSE) and harboring SCCmec type IV. Staphylococcus spp. contaminated some hospital kitchen's equipment, indicating that hygiene procedures should be improved. Results also indicate that meals can be a vehicle to disseminate multiresistant Staphylococcus spp., including MRSE, and Staphylococcus with EEGs.
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Affiliation(s)
- Roberta Fontanive Miyahira
- Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro-UERJ , Rio de Janeiro, Brasil
| | - Emanoella Araújo Santos
- Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro-UERJ , Rio de Janeiro, Brasil
| | - Robson Souza Leão
- Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro-UERJ , Rio de Janeiro, Brasil
| | - Angela Corrêa de Freitas-Almeida
- Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro-UERJ , Rio de Janeiro, Brasil
| | - Mara Lucia Queiroz
- Departamento de Microbiologia, Imunologia e Parasitologia, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro-UERJ , Rio de Janeiro, Brasil
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Ghosh A, Singh Y, Kapil A, Dhawan B. Staphylococcal Cassette Chromosome mec (SCCmec) typing of clinical isolates of coagulase-negative staphylocci (CoNS) from a tertiary care hospital in New Delhi, India. Indian J Med Res 2017; 143:365-70. [PMID: 27241652 PMCID: PMC4892085 DOI: 10.4103/0971-5916.182629] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Arnab Ghosh
- Department of Microbiology, All India Institute of Medical Sciences, New Delhi 110 029, India
| | - Yogesh Singh
- Department of Microbiology, University of Delhi, South Campus, New Delhi 110 021, India
| | - Arti Kapil
- Department of Microbiology, All India Institute of Medical Sciences, New Delhi 110 029, India
| | - Benu Dhawan
- Department of Microbiology, All India Institute of Medical Sciences, New Delhi 110 029, India
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Oliveira CFD, Cavanagh JP, Fredheim EGA, Reiter KC, Rieger A, Klingenberg C, d'Azevedo PA, Sollid JE. Coagulase-negative staphylococci in Southern Brazil: looking toward its high diversity. Rev Soc Bras Med Trop 2017; 49:292-9. [PMID: 27384825 DOI: 10.1590/0037-8682-0015-2016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 06/14/2016] [Indexed: 01/17/2023] Open
Abstract
INTRODUCTION Coagulase-negative staphylococci (CoNS) are the most prevalent pathogens in nosocomial infections and may serve as a reservoir of mobile genetic elements such as the staphylococcal cassette chromosome mec (SCCmec) encoding methicillin resistance. Molecular characterization of SCCmec types combined with advanced molecular typing techniques may provide essential information for understanding the evolution and epidemiology of CoNS infections. We therefore aimed to investigate the SCCmec distribution, multidrug-resistance (MDR), and biofilm formation in CoNS blood culture isolates from a hospital in Southern Brazil. METHODS We analyzed 136 CoNS blood culture isolates obtained during 2002-2004 from patients admitted to a tertiary care hospital in Brazil. SCCmec types I to V were determined using multiplex PCR. The clonal relationship of Staphylococcus epidermidis was determined using pulsed field gel electrophoresis (PFGE) and multilocus sequence typing (MLST). Molecular epidemiological data were interpreted along with data on biofilm formation, presence of the icaD gene, and MDR. RESULTS The most prevalent species were S. epidermidis, Staphylococcus haemolyticus, and Staphylococcus hominis harboring mainly SCCmec types II, III, and V. Overall, the presence of multiple SCCmec was associated with non-MDR, except for S. epidermidis. S. epidermidis isolates showed a high prevalence of icaD, but had low phenotypic biofilm formation. PFGE and MLST revealed high genetic diversity in the S. epidermidis population. CONCLUSIONS Our results suggest a major shift in SCCmec types within a short period and reveal a different behavior of S. epidermidis with regard to the association between the presence of multiple SCCmec types and MDR profile.
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Affiliation(s)
- Caio Fernando de Oliveira
- Programa de Pós Graduação em Promoção da Saúde, Universidade de Santa Cruz do Sul, Santa Cruz do Sul, Rio Grande do Sul, Brasil
| | - Jorunn Pauline Cavanagh
- Paediatric Research Group, Dept. of Clinical Medicine, Faculty of Health Sciences, UiT-The Artic University of Norway, Tromsø, Norway.,Department of Paediatrics, University Hospital of North Norway, Tromsø, Norway
| | - Elizabeth G Aarag Fredheim
- Paediatric Research Group, Dept. of Clinical Medicine, Faculty of Health Sciences, UiT-The Artic University of Norway, Tromsø, Norway.,Department of Paediatrics, University Hospital of North Norway, Tromsø, Norway
| | - Keli Cristine Reiter
- Departamento de Microbiologia e Parasitologia, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brasil
| | - Alexandre Rieger
- Laboratório de Biotecnologia e Genética, Universidade de Santa Cruz do Sul, Santa Cruz do Sul, Rio Grande do Sul, Brasil
| | - Claus Klingenberg
- Department of Paediatrics, University Hospital of North Norway, Tromsø, Norway
| | - Pedro Alves d'Azevedo
- Departamento de Microbiologia e Parasitologia, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brasil
| | - Johanna Ericson Sollid
- Research Group for Host-Microbe Interactions, Department of Medical Biology, Faculty of Health Sciences, UiT-The Artic University of Norway, Tromsø, Norway
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Deplano A, Vandendriessche S, Nonhoff C, Dodémont M, Roisin S, Denis O. National surveillance ofStaphylococcus epidermidisrecovered from bloodstream infections in Belgian hospitals. J Antimicrob Chemother 2016; 71:1815-9. [DOI: 10.1093/jac/dkw086] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 02/28/2016] [Indexed: 01/18/2023] Open
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Cheng CW, Liu TP, Yeh CF, Lee MH, Chang SC, Lu JJ. Persistence of a major endemic clone of oxacillin-resistant Staphylococcus lugdunensis sequence type 6 at a tertiary medical centre in northern Taiwan. Int J Infect Dis 2015; 36:72-7. [PMID: 26051975 DOI: 10.1016/j.ijid.2015.05.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 05/27/2015] [Accepted: 05/30/2015] [Indexed: 10/23/2022] Open
Abstract
OBJECTIVES The aim of this study was to investigate the molecular epidemiology and clinical characteristics of a major clone of oxacillin-resistant Staphylococcus lugdunensis in a tertiary hospital. METHODS All S. lugdunensis isolated from sterile sites between June 2003 and May 2013 were collected for analysis. Pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) were performed to study their genetic relationships. RESULTS A total of 118 S. lugdunensis isolates were analysed by PFGE. Three major PFGE pulsotypes were found: A, H, and L. Most of the pulsotype A isolates were oxacillin-resistant, and SCCmec type V and type VT. Isolates from another major clonal group that consisted primarily of pulsotype L were oxacillin-resistant and SCCmec type II. These 14 SCCmec type II S. lugdunensis isolates demonstrated high PFGE similarity and were obtained in the study hospital over a period of 40 months. Three of these 14 patients had clinically significant bacteraemia, and all three cases were in the intensive care unit. Further MLST analysis of the isolates identified an endemic S. lugdunensis strain of sequence type 6, clonal complex 1. CONCLUSIONS This study identified a major endemic clone of S. lugdunensis that is oxacillin-resistant, SCCmec type II, ST6, and capable of long-term persistence in the hospital. Continuous infection control surveillance and monitoring of S. lugdunensis should be considered in endemic areas.
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Affiliation(s)
- Chun-wen Cheng
- Division of Infectious Diseases, Department of Internal Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Tsui-ping Liu
- Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, No. 5 Fushing St., Gueishan, Taoyuan County 33375, Taiwan
| | - Chun-fu Yeh
- Division of Infectious Diseases, Department of Internal Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Ming-hsun Lee
- Division of Infectious Diseases, Department of Internal Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Shih-cheng Chang
- Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, No. 5 Fushing St., Gueishan, Taoyuan County 33375, Taiwan; Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Jang-jih Lu
- Department of Laboratory Medicine, Chang Gung Memorial Hospital at Linkou, No. 5 Fushing St., Gueishan, Taoyuan County 33375, Taiwan; Department of Medical Biotechnology and Laboratory Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan.
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de Araujo AR, Quelemes PV, Perfeito MLG, de Lima LI, Sá MC, Nunes PHM, Joanitti GA, Eaton P, Soares MJDS, de Souza de Almeida Leite JR. Antibacterial, antibiofilm and cytotoxic activities of Terminalia fagifolia Mart. extract and fractions. Ann Clin Microbiol Antimicrob 2015; 14:25. [PMID: 25902872 PMCID: PMC4406121 DOI: 10.1186/s12941-015-0084-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2014] [Accepted: 04/09/2015] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND The methicillin resistance of bacteria from the genus Staphylococcus and its ability to form biofilms are important factors in pathogenesis of these microorganisms. Thus, the search for new antimicrobials agents, especially from plants, has been intensified. In this context, Terminalia species have been the subject of research for many pharmacological activities. In this study we evaluated the antibacterial, antibiofilm and cytotoxic activities of the ethanol extract (EtE) from Terminalia fagifolia stem bark as well as that of three fractions of the extract (AqF, HaF and WSF). METHODS We determined the minimum inhibitory concentration (MIC) by microdilution in 96-well plates, where the strains were exposed to serial dilutions of the ethanol extract and fractions, ranging from 12.5 to 400 μg/mL. We then determined the minimum bactericidal concentration (MBC), seeding the inoculum (10 μL) with concentrations equal to or greater than the MIC in Mueller-Hinton agar. To test the antibiofilm activity biofilm formation was induced in the presence of concentrations equivalent to 1/2, 1/4 and 1/8 of the MIC extract or fraction tested. In addition, the effect of the EtE and the fractions on cell viability was tested by the MTT assay on human MCF-7 breast cancer and mouse fibroblast NIH/3T3. To obtain high-resolution images of the effect of the aqueous fraction on the bacterial morphology, atomic force microscopy (AFM) imaging of treated S. aureus cells was performed. RESULTS We observed antibacterial activity of EtE and fractions with MICs ranging from 25-200 μg/mL and MBCs ranging from 200-400 μg/mL. Regarding antibiofilm activity, both the EtE as the AqF, HaF and WSF fractions showed significant inhibition of the biofilm formation, with inhibition of biofilms formation of over 80% for some strains. The EtE and fractions showed a moderate cytotoxicity in cell line NIH/3T3 viability and potential antitumoral activity on human breast cancer cell line MCF-7. The microscopic images obtained revealed morphological changes to the S. aureus ATCC 29213 surface caused by AqF, as well as significant size alterations. CONCLUSIONS The results show potential antibacterial, antibiofilm and antitumoral activities of the ethanol extract and fractions of T. fagifolia.
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Affiliation(s)
- Alyne Rodrigues de Araujo
- Center for Research on Medicinal Plants, Federal University of Piauí, Piauí, Brazil. .,Biodiversity and Biotechnology Research Center, Biotec, Federal University of Piauí, Parnaíba, Piauí, Brazil.
| | - Patrick Veras Quelemes
- Biodiversity and Biotechnology Research Center, Biotec, Federal University of Piauí, Parnaíba, Piauí, Brazil.
| | - Márcia Luana Gomes Perfeito
- Biodiversity and Biotechnology Research Center, Biotec, Federal University of Piauí, Parnaíba, Piauí, Brazil.
| | - Luíza Ianny de Lima
- Biodiversity and Biotechnology Research Center, Biotec, Federal University of Piauí, Parnaíba, Piauí, Brazil. .,Campus Ceilândia, University of Brasília, Brasília, Brazil.
| | - Melka Coêlho Sá
- Federal University of Rio Grande do Norte, Rio Grande do Norte, Brazil.
| | | | | | - Peter Eaton
- UCIBIO, REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Porto, Portugal.
| | | | - José Roberto de Souza de Almeida Leite
- Center for Research on Medicinal Plants, Federal University of Piauí, Piauí, Brazil. .,Biodiversity and Biotechnology Research Center, Biotec, Federal University of Piauí, Parnaíba, Piauí, Brazil.
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