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Rakhalaru P, Munzhedzi L, Abia ALK, Kabue JP, Potgieter N, Traore AN. Prevalence and Antimicrobial Resistance Profile of Diarrheagenic Escherichia coli from Fomites in Rural Households in South Africa. Antibiotics (Basel) 2023; 12:1345. [PMID: 37627765 PMCID: PMC10451885 DOI: 10.3390/antibiotics12081345] [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: 07/14/2023] [Revised: 08/08/2023] [Accepted: 08/19/2023] [Indexed: 08/27/2023] Open
Abstract
Diarrheagenic Escherichia coli (DEC) pathotypes are the leading cause of mortality and morbidity in South Asia and sub-Saharan Africa. Daily interaction between people contributes to the spreading of Escherichia coli (E. coli), and fomites are a common source of community-acquired bacterial infections. The spread of bacterial infectious diseases from inanimate objects to the surrounding environment and humans is a serious problem for public health, safety, and development. This study aimed to determine the prevalence and antibiotic resistance of diarrheagenic E. coli found in toilets and kitchen cloths in the Vhembe district, South Africa. One hundred and five samples were cultured to isolate E. coli: thirty-five samples were kitchen cloths and seventy-five samples were toilet swabs. Biochemical tests, API20E, and the VITEK®-2 automated system were used to identify E. coli. Pathotypes of E. coli were characterised using Multiplex Polymerase Chain Reaction (mPCR). Nine amplified gene fragments were sequenced using partial sequencing. A total of eight antibiotics were used for the antibiotic susceptibility testing of E. coli isolates using the Kirby-Bauer disc diffusion method. Among the collected samples, 47% were positive for E. coli. DEC prevalence was high (81%), with ETEC (51%) harboring lt and st genes being the most dominant pathotype found on both kitchen cloths and toilet surfaces. Diarrheagenic E. coli pathotypes were more prevalent in the kitchen cloths (79.6%) compared with the toilet surfaces. Notably, hybrid pathotypes were detected in 44.2% of the isolates, showcasing the co-existence of multiple pathotypes within a single E. coli strain. The antibiotic resistance testing of E. coli isolates from kitchen cloths and toilets showed high resistance to ampicillin (100%) and amoxicillin (100%). Only E. coli isolates with hybrid pathotypes were found to be resistant to more than three antibiotics. This study emphasizes the significance of fomites as potential sources of bacterial contamination in rural settings. The results highlight the importance of implementing proactive measures to improve hygiene practices and antibiotic stewardship in these communities. These measures are essential for reducing the impact of DEC infections and antibiotic resistance, ultimately safeguarding public health.
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Affiliation(s)
| | | | | | | | | | - Afsatou Ndama Traore
- Department of Biochemistry and Microbiology, Faculty of Science, Engineering and Agriculture, University of Venda, Private Bag X5050, Thohoyandou 0950, South Africa; (P.R.); (L.M.); (A.L.K.A.); (J.P.K.); (N.P.)
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Rosin FCP, de Paula Novaes C, dos Santos AF, Deboni MCZ, Corrêa L. Photobiomodulation Therapy Minimises the DNA Damage in 5FU‐treated Gingival Fibroblasts. Photochem Photobiol 2022; 98:1201-1206. [DOI: 10.1111/php.13609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 02/16/2022] [Accepted: 02/17/2022] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | - Luciana Corrêa
- Pathology Department School of Dentistry University of São Paulo
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Alfinete N, Bolukaoto JY, Heine L, Potgieter N, Barnard TG. Virulence and phylogenetic analysis of enteric pathogenic Escherichia coli isolated from children with diarrhoea in South Africa. Int J Infect Dis 2021; 114:226-232. [PMID: 34775113 DOI: 10.1016/j.ijid.2021.11.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 10/22/2021] [Accepted: 11/06/2021] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Diarrhoeagenic E. coli pose a significant risk to human health. As such, determining the source(s) of these bacteria when isolated from patients with diarrhoea is an important step in disease prevention. OBJECTIVES This study aimed to identify the presence of genes coding for virulence and phylogroups among E. coli isolated from children hospitalised due to diarrhoea in Limpopo, South Africa. METHODS E. coli isolates were identified by VITEK®-2 automated system. An 11-gene multiplex PCR was used to differentiate five pathogenic types of E. coli: enteroaggregative (EAEC), enteroinvasive (EIEC), enterohaemorrhagic (EHEC), enteropathogenic (EPEC) and enterotoxigenic (ETEC). Clermont quadruplex PCR method was used to identify phylogroups of isolates. RESULTS From the 133 isolates tested, 79 were confirmed as E. coli of which (19.0%, 15/79) were commensals and 81.0% (64/79) isolates were positive for at least one pathotype of which ETEC was predominant (16.5%, 13/79), followed by EAEC (10.1%, 8/79), EPEC (7.6%, 6/79) and EHEC (2.5%, 2/79). Hybrid pathotypes were also detected and EAEC/ETEC was predominant (25.3%, 20/79). Phylogroup B2 was predominant (30.4%, 24/79), followed by group B1 (22.8%, 18/79), phylogroup C and E both had (12.7%, 10/79) each. Just over six percent (5/79) of isolates were non-typable. CONCLUSION There was a high distribution of diarrhoeagenic E. coli associated with different phylogroups among children living in Limpopo province, South Africa. This emphasises the importance of future monitoring of virulence and phylogroup distribution of E. coli isolates in this province in particular and South Africa as a whole.
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Affiliation(s)
- Ntando Alfinete
- Water and Health Research Centre, University of Johannesburg, Doornfontein, South Africa
| | - John Y Bolukaoto
- Water and Health Research Centre, University of Johannesburg, Doornfontein, South Africa
| | - Lee Heine
- Water and Health Research Centre, University of Johannesburg, Doornfontein, South Africa
| | - Natasha Potgieter
- School of Mathematical and Natural Sciences, University of Venda, Limpopo Province, South Africa
| | - Tobias G Barnard
- Water and Health Research Centre, University of Johannesburg, Doornfontein, South Africa.
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Bolukaoto JY, Singh A, Alfinete N, Barnard TG. Occurrence of Hybrid Diarrhoeagenic Escherichia coli Associated with Multidrug Resistance in Environmental Water, Johannesburg, South Africa. Microorganisms 2021; 9:2163. [PMID: 34683484 PMCID: PMC8538365 DOI: 10.3390/microorganisms9102163] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/25/2021] [Accepted: 09/27/2021] [Indexed: 12/20/2022] Open
Abstract
This study was undertaken to determine the virulence and antibiotic resistance profiles of diarrhoeagenic Escherichia coli (DEC) in environmental waters of Johannesburg, South Africa. Samples were collected and cultured on selective media. An 11-plex PCR assay was used to differentiate five DEC, namely: enteroaggregative (EAEC), enterohaemorrhagic (EHEC), enteroinvasive (EIEC), enteropathogenic (EPEC) and enterotoxigenic (ETEC). The antibiotic resistance profile of isolates was determined using the VITEK®-2 automated system. The virulence profiles of 170 E. coli tested showed that 40% (68/170) were commensals and 60% (102/170) were pathogenic. EPEC had a prevalence of 19.2% (32/170), followed by ETEC 11.4% (19/170), EAEC 6% (10/170) and EHEC 3% (5/170). Hybrid DEC carrying a combination of simultaneously two and three pathogenic types was detected in twenty-eight and nine isolates, respectively. The antibiotic susceptibility testing showed isolates with multidrug resistance, including cefuroxime (100%), ceftazidime (86%), cefotaxime (81%) and cefepime (79%). This study highlighted the widespread occurrence of DEC and antibiotic resistance strains in the aquatic ecosystem of Johannesburg. The presence of hybrid pathotypes detected in this study is alarming and might lead to more severe diseases. There is a necessity to enhance surveillance in reducing the propagation of pathogenic and antibiotic-resistant strains in this area.
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Affiliation(s)
| | | | | | - Tobias G. Barnard
- Water and Health Research Centre, University of Johannesburg, Doornfontein 2092, South Africa; (J.Y.B.); (A.S.); (N.A.)
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da Fonseca Iwahara LK, de Paoli F, da Fonseca ADS. Low-Power Red and Infrared Laser Effects on Cells Deficient in DNA Repair. J Lasers Med Sci 2019; 10:157-162. [PMID: 31749939 DOI: 10.15171/jlms.2019.25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Introduction: Low-level lasers are successfully used to prevent and treat diseases in soft oral and bone tissues, particularly diseases in oral cavity caused by chemotherapy and radiotherapy in oncology. However, controversy exists as to whether these lasers induce molecular side effects, mainly on DNA. The aim of this work was to assess the effects of low-power lasers on mutant Escherichia coli cells in DNA repair. Methods: Escherichia coli wild type cultures as well as those lacking recombination DNA repair (recA -) and la SOS responses (lexA -) irradiated with lasers at different energy densities, powers, and emission modes for cell viability and morphology assessment were used in this study. Results: Laser irradiation: (i) did not affect cell viability of non-mutant and lexA - cells but decreased viability in recA - cultures; (ii) altered morphology of wild type and lexA, depending on the energy density, power, emission mode, and wavelength. Conclusion: Results show that low-level lasers have lethal effects on both recombination DNA repair and SOS response bacterial cells but do not induce morphological modifications in these cells.
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Affiliation(s)
- Lucas Kiyoshi da Fonseca Iwahara
- Instituto de Biociências, Universidade Federal do Estado do Rio de Janeiro, Avenida Pasteur, 296, Urca, Rio de Janeiro, 22290240, Brazil
| | - Flavia de Paoli
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Rua José Lourenço Kelmer, s/n - Campus Universitário, São Pedro, Juiz de Fora, Minas Gerais, 36036900, Brazil
| | - Adenilson de Souza da Fonseca
- Laboratório de Biofotônica, Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Boulevard Vinte e Oito de Setembro, 87, fundos, 4º andar, Vila Isabel, Rio de Janeiro, 20551030, Brazil.,Departamento de Ciências Fisiológicas, Instituto Biomédico, Universidade Federal do Estado do Rio de Janeiro, Rua Frei Caneca, 94, Rio de Janeiro, 20211040, Brazil.,Centro de Ciências da Saúde, Centro Universitário Serra dos Órgãos, Avenida Alberto Torres, 111, Teresópolis, Rio de Janeiro, 25964004, Brazil
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Bacterial Contamination of Children's Toys in Rural Day Care Centres and Households in South Africa. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:ijerph16162900. [PMID: 31412661 PMCID: PMC6720433 DOI: 10.3390/ijerph16162900] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 07/25/2019] [Accepted: 07/29/2019] [Indexed: 01/18/2023]
Abstract
Background: Young children exhibit a high susceptibility to several diarrhoea-causing bacterial microorganisms. In this study, the prevalence of fecal contamination on children’s toys was determined using total coliform and E. coli as bacterial fecal indicators. The prevalence of diarrhoeagenic E. coli strains were used as an indication of the potential health risks. Materials and Methods: A cross-sectional descriptive study was carried out for 3 months in rural communities in the Vhembe district, Limpopo province of South Africa. Nonporous plastic toys (n = 137) used by children under 5 years of age in households and day care centres (DCCs) from rural villages were collected for assessment. New toys (n = 109) were provided to the households and DCCs and collected again after 4 weeks. Microbiological assessment was carried out using the Colilert® Quanti-Tray/2000 system. Diarrhoeagenic E. coli strains were identified using a published multiplex PCR protocol. Results: Water, sanitation and hygiene (WASH) conditions of the children in the households and DCCs were assessed. Statistical analysis was used to identify the relationship between fecal contamination of the existing and introduced toys. All the existing and introduced toy samples, both from DCCs and households, tested positive for total coliform counts and 61 existing and introduced toy samples tested positive for E. coli counts. Diarrhoeagenic E. coli strains identified included EHEC, ETEC, EPEC, EIEC and EAEC. Conclusions: The results indicated that water, sanitation and hygiene conditions could be responsible in the contamination of children’s toys and the transmission of diarrhoea to young children.
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Djavid GE, Goliaie B, Nikoofar A. Analysis of Radiomodulatory Effect of Low-Level Laser Irradiation by Clonogenic Survival Assay. Photomed Laser Surg 2017; 33:452-9. [PMID: 26332916 DOI: 10.1089/pho.2015.3893] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
OBJECTIVE The aim of this study was to investigate the radiomoulatory effects of low-level laser irradiation (LLLI) in normal and cancer cells exposed to ionizing X-ray radiation on clonogenic survival assay. BACKGROUND DATA LLLI does have radioprotective effects on normal tissue. LLLI can reduce the incidence of mucocutaneous complications of ionizing radiation. Few in vitro studies reported adaptive responses for LLLI to ionizing radiation in normal and cancer cells, particularly with respect to clonogenic cell survival assay. METHODS Normal NIH 3T3 cells and cancer HeLa cells were irradiated with 685 and 830 nm LLLI at different energy densities prior to ionizing X-ray radiation. The survival fraction was determined after ionizing radiation (0, 2, 4, and 6 Gy). The values of the linear (α) and quadratic (β) parameters were calculated based on the clonogenic survival curves. RESULTS Clonogenic radiation survival assay showed that the application of LLLI at 685 nm prior to ionizing radiation could significantly inhibit clonogenic growth of HeLa cells compared with unirradiated HeLa cells. LLLI could also significantly increase the α parameter of the linear quadratic (LQ) model. In contrast, application of LLLI at 830 nm could significantly protect NIH 3T3 cells against radiation and decreased α parameter. CONCLUSIONS This study suggests that various physical parameters of LLLI can be diverse adaptive responses to ionizing radiation on normal and cancer cells.
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Affiliation(s)
- Gholamreza Esmaeeli Djavid
- 1 Laboratory of Biophysics and Molecular Biology, Institute of Biochemistry and Biophysics (IBB), University of Tehran , Tehran, Iran
| | - Bahram Goliaie
- 1 Laboratory of Biophysics and Molecular Biology, Institute of Biochemistry and Biophysics (IBB), University of Tehran , Tehran, Iran
| | - Alireza Nikoofar
- 2 Radiotherapy Department, Firoozgar Hospital, Iran University of Medical Sciences . Tehran, Iran
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Barboza LL, Campos VMA, Magalhães LAG, Paoli F, Fonseca AS. Low-intensity red and infrared laser effects at high fluences on Escherichia coli cultures. ACTA ACUST UNITED AC 2015; 48:945-52. [PMID: 26445339 PMCID: PMC4617122 DOI: 10.1590/1414-431x20154460] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 06/09/2015] [Indexed: 11/22/2022]
Abstract
Semiconductor laser devices are readily available and practical radiation sources providing wavelength tenability and high monochromaticity. Low-intensity red and near-infrared lasers are considered safe for use in clinical applications. However, adverse effects can occur via free radical generation, and the biological effects of these lasers from unusually high fluences or high doses have not yet been evaluated. Here, we evaluated the survival, filamentation induction and morphology of Escherichia coli cells deficient in repair of oxidative DNA lesions when exposed to low-intensity red and infrared lasers at unusually high fluences. Cultures of wild-type (AB1157), endonuclease III-deficient (JW1625-1), and endonuclease IV-deficient (JW2146-1) E. coli, in exponential and stationary growth phases, were exposed to red and infrared lasers (0, 250, 500, and 1000 J/cm2) to evaluate their survival rates, filamentation phenotype induction and cell morphologies. The results showed that low-intensity red and infrared lasers at high fluences are lethal, induce a filamentation phenotype, and alter the morphology of the E. coli cells. Low-intensity red and infrared lasers have potential to induce adverse effects on cells, whether used at unusually high fluences, or at high doses. Hence, there is a need to reinforce the importance of accurate dosimetry in therapeutic protocols.
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Affiliation(s)
- L L Barboza
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Rio de Janeiro, RJ, BR
| | - V M A Campos
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Rio de Janeiro, RJ, BR
| | - L A G Magalhães
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Rio de Janeiro, RJ, BR
| | - F Paoli
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, BR
| | - A S Fonseca
- Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Rio de Janeiro, RJ, BR
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Fonseca AS, Campos VMA, Magalhães LAG, Paoli F. Nucleotide excision repair pathway assessment in DNA exposed to low-intensity red and infrared lasers. ACTA ACUST UNITED AC 2015; 48:929-38. [PMID: 26445337 PMCID: PMC4617120 DOI: 10.1590/1414-431x20154457] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 03/17/2015] [Indexed: 02/02/2023]
Abstract
Low-intensity lasers are used for prevention and management of oral mucositis induced
by anticancer therapy, but the effectiveness of treatment depends on the genetic
characteristics of affected cells. This study evaluated the survival and induction of
filamentation of Escherichia coli cells deficient in the nucleotide
excision repair pathway, and the action of T4endonuclease V on plasmid DNA
exposed to low-intensity red and near-infrared laser light. Cultures of wild-type
(strain AB1157) E. coli and strain AB1886 (deficient in uvrA
protein) were exposed to red (660 nm) and infrared (808 nm) lasers at various
fluences, powers and emission modes to study bacterial survival and filamentation.
Also, plasmid DNA was exposed to laser light to study DNA lesions produced in
vitro by T4endonuclease V. Low-intensity
lasers:i) had no effect on survival of wild-type E.
coli but decreased the survival of uvrA protein-deficient
cells,ii) induced bacterial filamentation, iii)
did not alter the electrophoretic profile of plasmids in agarose gels,
andiv) did not alter the electrophoretic profile of plasmids
incubated with T4 endonuclease V. These results increase our understanding
of the effects of laser light on cells with various genetic characteristics, such as
xeroderma pigmentosum cells deficient in nucleotide excision pathway activity in
patients with mucositis treated by low-intensity lasers.
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Affiliation(s)
- A S Fonseca
- Laboratório de Ciências Radiológicas, Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Rio de Janeiro, RJ, BR
| | - V M A Campos
- Laboratório de Ciências Radiológicas, Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Rio de Janeiro, RJ, BR
| | - L A G Magalhães
- Laboratório de Ciências Radiológicas, Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcântara Gomes, Rio de Janeiro, RJ, BR
| | - F Paoli
- Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, BR
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Sergio LPDS, Silva APAD, Amorim PF, Campos VMA, Magalhães LAG, de Paoli F, de Souza da Fonseca A. DNA damage in blood cells exposed to low-level lasers. Lasers Surg Med 2015; 47:361-8. [PMID: 25740459 DOI: 10.1002/lsm.22344] [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] [Accepted: 01/08/2015] [Indexed: 11/06/2022]
Abstract
BACKGROUND AND OBJECTIVE In regenerative medicine, there are increasing applications of low-level lasers in therapeutic protocols for treatment of diseases in soft and in bone tissues. However, there are doubts about effects on DNA, and an adequate dosimetry could improve the safety of clinical applications of these lasers. This work aimed to evaluate DNA damage in peripheral blood cells of Wistar rats induced by low-level red and infrared lasers at different fluences, powers, and emission modes according to therapeutic protocols. MATERIAL AND METHODS Peripheral blood samples were exposed to lasers and DNA damage was accessed by comet assay. In other experiments, DNA damage was accessed in blood cells by modified comet assay using formamidopyrimidine DNA glycosylase (Fpg) and endonuclease III enzymes. RESULTS Data show that exposure to low-level red and infrared lasers induce DNA damage depending on fluence, power and emission mode, which are targeted by Fpg and endonuclease III. CONCLUSION Oxidative DNA damage should be considered for therapeutic efficacy and patient safety in clinical applications based on low-level red and infrared lasers.
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Affiliation(s)
- Luiz Philippe da Silva Sergio
- Laboratório, de Ciências, Radiológicas, Departamento de Biofísica e Biometria, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, Maracanã, Rio de Janeiro, 20550900, Brazil
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Omar KB, Barnard TG. Detection of diarrhoeagenic Escherichia coli in clinical and environmental water sources in South Africa using single-step 11-gene m-PCR. World J Microbiol Biotechnol 2014; 30:2663-71. [PMID: 24969140 PMCID: PMC4150989 DOI: 10.1007/s11274-014-1690-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Accepted: 06/16/2014] [Indexed: 11/25/2022]
Abstract
Escherichia coli (E. coli) consists of commensal (ComEC) and diarrhoeagenic (DEC) groups. ComEC are detected using traditional culture methods. Conformational steps are performed after culturing if it is required to test for the presence of DEC, increasing cost and time in obtaining the results. The aim of this study was to develop a single-step multiplex polymerase chain reaction (m-PCR) that can simultaneously amplify genes associated with DEC and ComEC, with the inclusion of controls to monitor inhibition. A total of 701 samples, taken from clinical and environmental water sources in South Africa, were analysed with the optimised m-PCR which targeted the eaeA, stx1, stx2, lt, st, ial, eagg, astA and bfp virulence genes. The mdh and gapdh genes were included as an internal and external control, respectively. The presence of the external control gapdh gene in all samples excluded any possible PCR inhibition. The internal control mdh gene was detected in 100 % of the environmental and 85 % of the clinical isolates, confirming the classification of isolates as E. coli PCR positive samples. All DEC types were detected in varying degrees from the mdh positive environmental and clinical isolates. Important gene code combinations were detected for clinical isolates of 0.4 % lt and eagg. However, 2.3 % of eaeA and ial, and 8.7 % of eaeA and eagg were reported for environmental water samples. The E. coli astA toxin was detected as positive at 35 and 17 % in environmental isolates and clinical isolates, respectively. Interestingly, 25 % of the E. coli astA toxin detected in environmental isolates and 17 % in clinical isolates did not contain any of the other virulence genes tested. In conclusion, the optimised single-step 11-gene m-PCR reactions could be successfully used for the identification of pathogenic and non-pathogenic E. coli types. The m-PCR was also successful in showing monitoring for PCR inhibition to ensure correct reporting of the results.
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Affiliation(s)
- K. B. Omar
- Faculty of Health Sciences, Water and Health Research Centre, University of Johannesburg, Doornfontein, PO Box 17011, Johannesburg, 2028 South Africa
| | - T. G. Barnard
- Faculty of Health Sciences, Water and Health Research Centre, University of Johannesburg, Doornfontein, PO Box 17011, Johannesburg, 2028 South Africa
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da Silva Sergio LP, da Silva Marciano R, Teixeira GR, da Silva Canuto K, Polignano GAC, Guimarães OR, Geller M, de Paoli F, de Souza da Fonseca A. Therapeutic low-intensity red laser for herpes labialis on plasmid survival and bacterial transformation. Photochem Photobiol Sci 2013; 12:930-5. [DOI: 10.1039/c3pp25394e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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13
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da Silva Marciano R, da Silva Sergio LP, Polignano GAC, Presta GA, Guimarães OR, Geller M, de Paoli S, de Paoli F, da Fonseca ADS. Laser for treatment of aphthous ulcers on bacteria cultures and DNA. Photochem Photobiol Sci 2012; 11:1476-83. [PMID: 22766761 DOI: 10.1039/c2pp25027f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Low-intensity red lasers are proposed for treatment of oral aphthous ulcers based on biostimulative effects. However, effects of low-intensity lasers at fluences used in clinical protocols on DNA are controversial. The aim of this work was to evaluate the effects of low-intensity red laser on survival and induction of filamentation of Escherichia coli cells, and induction of DNA lesions in bacterial plasmids. Escherichia coli cultures were exposed to laser (660 nm, 100 mW, 25 and 45 J cm(-2)) to study bacterial survival and filamentation. Also, bacterial plasmids were exposed to laser to study DNA lesions by electrophoretic profile and action of DNA repair enzymes. Data indicate that low-intensity red laser: (i) had no effect on survival of E. coli wild type, exonuclease III and formamidopyrimidine DNA glycosylase/MutM protein but decreased the survival of endonuclease III deficient cultures; (ii) induced bacterial filamentation, (iii) there was no alteration in the electrophoretic profile of plasmids in agarose gels, (iv) there was no alteration in the electrophoretic profile of plasmids incubated with formamidopyrimidine DNA glycosylase/MutM protein and endonuclease III enzymes, but it altered the electrophoretic profile of plasmids incubated with exonuclease III. Low-intensity red laser at therapeutic fluences has an effect on the survival of E. coli endonuclease III deficient cells, induces bacterial filamentation in E. coli cultures and DNA lesions targeted by exonuclease III.
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Affiliation(s)
- Roberta da Silva Marciano
- Centro de Ciências da Saúde, Centro Universitário Serra dos Órgãos, Avenida Alberto Torres, 111, Alto, Teresópolis, Rio de Janeiro, 25964004, Brazil
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14
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Low-level infrared laser effect on plasmid DNA. Lasers Med Sci 2011; 27:121-30. [PMID: 21556926 DOI: 10.1007/s10103-011-0905-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Accepted: 01/18/2011] [Indexed: 12/31/2022]
Abstract
Low-level laser therapy is used in the treatment of many diseases based on its biostimulative effect. However, the photobiological basis for its mechanism of action and adverse effects are not well understood. The aim of this study, using experimental models, was to evaluate the effects of laser on bacterial plasmids in alkaline agarose gel electrophoresis and Escherichia coli cultures. The electrophoretic profile of bacterial plasmids in alkaline agarose gels were used for studying lesions in DNA exposed to infrared laser. Transformation efficiency and survival of Escherichia coli AB1157 (wild-type), BH20 (fpg/mutM(-)), BW9091 (xth(-)), and DH5αF'Iq (recA(-)) cells harboring pBSK plasmids were used as experimental models to assess the effect of laser on plasmid DNA outside and inside of cells. Data indicate low-level laser: (1) altered the electrophoretic profile of plasmids in alkaline gels at 2,500-Hz pulsed-emission mode but did not alter at continuous wave, 2.5- and 250-Hz pulsed-emission mode; (2) altered the transformation efficiency of plasmids in wild-type and fpg/mutM(-) E. coli cells; (3) altered the survival fpg/mutM(-), xthA(-) and recA(-) E. coli cultures harboring pBSK plasmids. Low-level infrared laser with therapeutic fluencies at high frequency in pulsed-emission modes have effects on bacterial plasmids. Infrared laser action can differently affect the survival of plasmids in E. coli cells proficient and deficient in DNA repair mechanisms, therefore, laser therapy protocol should take into account fluencies, frequencies and wavelength of laser, as well as tissue conditions and genetic characteristics of cells before beginning treatment.
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Fonseca AS, Moreira TO, Paixão DL, Farias FM, Guimarães OR, de Paoli S, Geller M, de Paoli F. Effect of laser therapy on DNA damage. Lasers Surg Med 2010; 42:481-8. [PMID: 20662024 DOI: 10.1002/lsm.20921] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
BACKGROUND AND OBJECTIVE Whereas the biostimulative effect on tissues using low intensity laser therapy for treating many diseases has been described, the photobiological basis and adverse effects are not well understood. The aim of this study, using experimental models, is to observe the combined effect of physical damage (laser) and a chemical agent (hydrogen peroxide) on Escherichia coli cultures and bacterial plasmids. MATERIALS AND METHODS Survival of E. coli AB1157 (wild type) and BW9091 (xth(-)) cultures were used as an experimental model to assess the effect of agents on DNA, also agarose gel electrophoretic profile of bacterial plasmids for studying single and double strand breaks in DNA exposed to laser irradiation and in DNA pre-exposed to laser and subsequently incubated with hydrogen peroxide. RESULTS Data indicate low intensity laser: (i) did not alter the survival of E. coli cultures, (ii) pre-exposure had a protective effect against lethal action of hydrogen peroxide on E. coli cultures, and (iii) did not alter the electrophoretic profile and action of hydrogen peroxide on plasmids. This suggests that low intensity therapeutic red laser doses at different emission modes induces sub-lethal effects on E. coli wild type and exonuclease III mutant cultures inducing protective mechanisms against lethal action of hydrogen peroxide. Laser action on bacterial plasmids is related to lesions other than single or double DNA strands breaks. CONCLUSIONS This study shows a protective effect or DNA repair mechanism induction by pre-exposure to low intensity red laser on the lethal action of oxidant agents and, therefore, laser therapy protocol should consider fluencies, wavelength and tissue conditions before beginning treatment.
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Affiliation(s)
- Adenilson S Fonseca
- Departamento de Ciências Fisiológicas, Instituto Biomédico, Universidade Federal do Estado do Rio de Janeiro, Rua Frei Caneca, 94, Rio de Janeiro 20211040, Brazil.
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Liu Y, Hu N. Electrochemical detection of natural DNA damage induced by ferritin/ascobic acid/H2O2 system and amplification of DNA damage by endonuclease Fpg. Biosens Bioelectron 2009; 25:185-90. [DOI: 10.1016/j.bios.2009.06.035] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2009] [Revised: 06/09/2009] [Accepted: 06/23/2009] [Indexed: 11/26/2022]
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