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Abdelaziz MA, El-Aziz AMA, El-Sokkary MMA, Barwa R. Characterization and genetic analysis of extensively drug-resistant hospital acquired Pseudomonas aeruginosa isolates. BMC Microbiol 2024; 24:225. [PMID: 38926687 PMCID: PMC11201863 DOI: 10.1186/s12866-024-03321-5] [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: 09/10/2023] [Accepted: 05/06/2024] [Indexed: 06/28/2024] Open
Abstract
BACKGROUND The incidence of hospital-acquired infections in extensively drug-resistant Pseudomonas aeruginosa (XDR-PA) has been increasing worldwide and is frequently associated with an increase in mortality and morbidity rates. The aim of this study was to characterize clinical XDR-PA isolates recovered during six months at three different hospitals in Egypt. RESULTS Seventy hospital-acquired clinical isolates of P. aeruginosa were classified into multidrug-resistant (MDR), extensively drug-resistant (XDR) and pandrug-resistant (PDR), according to their antimicrobial resistance profile. In addition, the possession of genes associated with mobile genetic elements and genes encoding antimicrobial resistance determinants among isolates were detected using polymerase chain reaction. As a result, a significant percentage of the isolates (75.7%) were XDR, while 18.5% were MDR, however only 5.7% of the isolates were non-MDR. The phenotypic detection of carbapenemases, extended-spectrum β-lactamases (ESBLs) and metallo β-lactamase (MBL) enzymes showed that 73.6% of XDR-PA isolates were carbapenemases producers, whereas 75.5% and 88.7% of XDR-PA isolates produced ESBLs and MBL respectively. In addition, PCR screening showed that oxa gene was the most frequently detected gene of carbapenemases (91.4%), while aac(6')-lb gene was mostly detected (84.3%) among the screened aminoglycosides-resistance genes. Furthermore, the molecular detection of the colistin resistance gene showed that 12.9% of isolates harbored mcr-1 gene. Concerning mobile genetic element markers (intI, traA, tnp513, and merA), intI was the highest detected gene as it was amplified in 67 isolates (95.7%). Finally, phylogenetic and molecular typing of the isolates via ERIC-PCR analysis revealed 10 different ERIC fingerprints. CONCLUSION The present study revealed a high prevalence of XDR-PA in hospital settings which were resistant to a variety of antibiotics due to several mechanisms. In addition, 98% of the XDR-PA clinical isolates contained at least one gene associated with movable genetic elements, which could have aided the evolution of these XDR-PA strains. To reduce spread of drug resistance, judicious use of antimicrobial agents and strict infection control measures are therefore essential.
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Affiliation(s)
- Mai A Abdelaziz
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Abeer M Abd El-Aziz
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
| | - Mohamed M A El-Sokkary
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.
| | - Rasha Barwa
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
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Maslova E, EisaianKhongi L, Rigole P, Coenye T, McCarthy RR. Carbon source competition within the wound microenvironment can significantly influence infection progression. NPJ Biofilms Microbiomes 2024; 10:52. [PMID: 38918415 PMCID: PMC11199515 DOI: 10.1038/s41522-024-00518-4] [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: 11/30/2023] [Accepted: 05/08/2024] [Indexed: 06/27/2024] Open
Abstract
It is becoming increasingly apparent that commensal skin bacteria have an important role in wound healing and infection progression. However, the precise mechanisms underpinning many of these probiotic interactions remain to be fully uncovered. In this work, we demonstrate that the common skin commensal Cutibacterium acnes can limit the pathogenicity of the prevalent wound pathogen Pseudomonas aeruginosa in vivo. We show that this impact on pathogenicity is independent of any effect on growth, but occurs through a significant downregulation of the Type Three Secretion System (T3SS), the primary toxin secretion system utilised by P. aeruginosa in eukaryotic infection. We also show a downregulation in glucose acquisition systems, a known regulator of the T3SS, suggesting that glucose availability in a wound can influence infection progression. C. acnes is well known as a glucose fermenting organism, and we demonstrate that topically supplementing a wound with glucose reverses the probiotic effects of C. acnes. This suggests that introducing carbon source competition within the wound microenvironment may be an effective way to prevent or limit wound infection.
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Affiliation(s)
- Evgenia Maslova
- Division of Biosciences, Department of Life Sciences, College of Health and Life Sciences, Brunel University London, Uxbridge, UK
| | - Lara EisaianKhongi
- Division of Biosciences, Department of Life Sciences, College of Health and Life Sciences, Brunel University London, Uxbridge, UK
| | - Petra Rigole
- Laboratory of Pharmaceutical Microbiology, Ghent University, 9000, Ghent, Belgium
| | - Tom Coenye
- Laboratory of Pharmaceutical Microbiology, Ghent University, 9000, Ghent, Belgium
| | - Ronan R McCarthy
- Division of Biosciences, Department of Life Sciences, College of Health and Life Sciences, Brunel University London, Uxbridge, UK.
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Jafari-Ramedani S, Nazari M, Arzanlou M, Peeri-Dogaheh H, Sahebkar A, Khademi F. Prevalence and molecular characterization of colistin resistance in Pseudomonas aeruginosa isolates: insights from a study in Ardabil hospitals. BMC Microbiol 2024; 24:152. [PMID: 38702660 PMCID: PMC11067120 DOI: 10.1186/s12866-024-03309-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 04/17/2024] [Indexed: 05/06/2024] Open
Abstract
BACKGROUND Pseudomonas aeruginosa is a common cause of nosocomial infections. However, the emergence of multidrug-resistant strains has complicated the treatment of P. aeruginosa infections. While polymyxins have been the mainstay for treatment, there is a global increase in resistance to these antibiotics. Therefore, our study aimed to determine the prevalence and molecular details of colistin resistance in P. aeruginosa clinical isolates collected between June 2019 and May 2023, as well as the genetic linkage of colistin-resistant P. aeruginosa isolates. RESULTS The resistance rate to colistin was 9% (n = 18) among P. aeruginosa isolates. All 18 colistin-resistant isolates were biofilm producers and carried genes associated with biofilm formation. Furthermore, the presence of genes encoding efflux pumps, TCSs, and outer membrane porin was observed in all colistin-resistant P. aeruginosa strains, while the mcr-1 gene was not detected. Amino acid substitutions were identified only in the PmrB protein of multidrug- and colistin-resistant strains. The expression levels of mexA, mexC, mexE, mexY, phoP, and pmrA genes in the 18 colistin-resistant P. aeruginosa strains were as follows: 88.8%, 94.4%, 11.1%, 83.3%, 83.3%, and 38.8%, respectively. Additionally, down-regulation of the oprD gene was observed in 44.4% of colistin-resistant P. aeruginosa strains. CONCLUSION This study reports the emergence of colistin resistance with various mechanisms among P. aeruginosa strains in Ardabil hospitals. We recommend avoiding unnecessary use of colistin to prevent potential future increases in colistin resistance.
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Affiliation(s)
- Saghar Jafari-Ramedani
- Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Maryam Nazari
- Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Mohsen Arzanlou
- Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Hadi Peeri-Dogaheh
- Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Amirhossein Sahebkar
- Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
- Applied Biomedical Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Farzad Khademi
- Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran.
- Arthropod-Borne Diseases Research Center, Ardabil University of Medical Sciences, Ardabil, Iran.
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Shoja S, Ghasemi S, Dastranj M, Shamseddin J, Ebrahimi N, Alizade H, Farahani A. Characterization of genotypes and antimicrobial resistance profiles of clinical isolates of Shigella from patients in the southern region of Iran. Eur J Med Res 2023; 28:611. [PMID: 38115112 PMCID: PMC10731726 DOI: 10.1186/s40001-023-01570-0] [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: 09/08/2023] [Accepted: 12/06/2023] [Indexed: 12/21/2023] Open
Abstract
BACKGROUND Shigella spp., which are facultative anaerobic bacilli within the Enterobacteriaceae family, present a significant public health burden due to their role as prominent contributors to diarrheal diseases worldwide. A molecular analysis can facilitate the identification and assessment of outbreaks involving this bacterium. So, we aimed to investigate the antibiotic susceptibility pattern and clonal relatedness of clinical Shigella spp. isolates obtained from patients with diarrhea in Hormozgan province, South of Iran. METHODS From 2019 to 2021, a cross-sectional investigation was conducted on 448 stool samples obtained from patients who were experiencing diarrhea, in the southern region of Iran. Shigella spp. isolates were identified based on biochemical and serological tests. All Shigella species were verified using species-specific polymerase chain reaction (PCR), followed by susceptibility testing to antimicrobial agents. Subsequently, genotyping of all Shigella species was conducted using ERIC-PCR. RESULTS Out of a total of 448 stool samples, the presence of Shigella was detected in 62 cases, accounting for a prevalence rate of 13.84%. Among the identified isolates, the majority were attributed to S. flexneri, representing 53.23% of the cases. This was followed by S. sonnei at 24.19% and S. boydii at 22.58%. Notably, no instances of S. dysenteriae were found. The highest prevalence of Shigella isolates was observed in infants and children under the age of five. A significant proportion of the identified isolates demonstrated resistance to various antibiotics. Specifically, high resistance rates were noted for ampicillin (90.78%), piperacillin-tazobactam (87.1%), cefixime (83.87%), trimethoprim-sulfamethoxazole (83.87%), cefotaxime (82.26%), and ceftriaxone (80.65%). In addition, a substantial number (87.1%) of the isolates exhibited a multidrug-resistant (MDR) phenotype. Using the ERIC-PCR method, a total of 11 clusters and 6 distinct single types were identified among all the Shigella isolates. CONCLUSION A notable occurrence of antibiotic-resistant Shigella species has been noted, with multi-drug resistant (MDR) strains presenting an increasing challenge for treating shigellosis worldwide, and this includes Iran. Techniques such as ERIC-PCR are useful for assessing the genetic variation and connections between Shigella strains, which indirectly contributes to understanding antimicrobial resistance patterns. Further research is needed to explore the specific correlation between resistance genes and ERIC genotyping patterns in Shigella strains.
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Affiliation(s)
- Saeed Shoja
- Infectious and Tropical Diseases Research Center, Hormozgan Health Institute, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Saba Ghasemi
- Infectious and Tropical Diseases Research Center, Hormozgan Health Institute, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
- Student Research Committee, Yasuj University of Medical Sciences, Yasuj, Iran
| | - Mahsa Dastranj
- Infectious and Tropical Diseases Research Center, Hormozgan Health Institute, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Jebreil Shamseddin
- Infectious and Tropical Diseases Research Center, Hormozgan Health Institute, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Nasim Ebrahimi
- Hepatitis and AIDS Department, Pasture Institute of Iran, Tehran, Iran
| | - Hesam Alizade
- Infectious and Tropical Diseases Research Center, Hormozgan Health Institute, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Abbas Farahani
- Molecular and Medicine Research Center, Khomein University of Medical Sciences, Khomein, Iran.
- Department of Medical Laboratory Sciences, Khomein University of Medical Sciences, Khomein, Iran.
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Gervasoni LF, Peixoto IC, Imperador AC, De Oliveira LB, Correia LF, de Oliveira Vieira KC, Saeki EK, da Silva Lima PE, Mareco EA, Pereira VC, Winkelströter Eller LK. "Relationship between antibiotic resistance, biofilm formation, virulence factors and source of origin of Pseudomonas aeruginosa environmental isolates with regard to the presence of metallo-β-lactamase-encoding genes". Microb Pathog 2023; 182:106223. [PMID: 37423498 DOI: 10.1016/j.micpath.2023.106223] [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: 05/02/2023] [Revised: 06/22/2023] [Accepted: 06/30/2023] [Indexed: 07/11/2023]
Abstract
A total of 557 water samples were evaluated and of these, 23 were positive for the presence of Pseudomonas aeruginosa. Approximately 91.7% of them were weak biofilm formers. Only 4 isolates showed antimicrobial resistance. All isolates presented Twitching motility, a positive result for the production of pyocyanin, alkaline protease, and hemolysins. The genotypic tests showed: lasA, (95.6%) lasB (95.6%), exoS (95.6%), exoT (91.3%), toxA (91.3%), akgO (91.3%), plcN (91.3%) aprA (86.9%), phzM (78.3%), and pvdA (60.9%). For genes encoding metallo-beta-lactamase, it was found: blaVIM (56.6%), blaSPM (4.3%), and blaSIM (47.8%). A strong association was found between the metallo-beta-lactamase producing genes, nine genes of virulence factors and the motility (r = 0.6231). The very close clonal profile suggests a probable similarity between the isolates from different cities. Thus, P. aeruginosa can be present in water supplies with variable virulence capacities and can generate a huge concern for human, animal, and environmental health.
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Affiliation(s)
- Letícia Franco Gervasoni
- Faculty of Health Science, University of Western São Paulo - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil
| | - Inaiá Calegari Peixoto
- Faculty of Health Science, University of Western São Paulo - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil
| | - Anna Cardoso Imperador
- Faculty of Health Science, University of Western São Paulo - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil
| | - Lívia Batista De Oliveira
- Faculty of Health Science, University of Western São Paulo - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil
| | - Lucimeire Fernandes Correia
- Health Science, University of Western São Paulo - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil
| | - Karolinny Cristiny de Oliveira Vieira
- Program of Animal Science, University of Western São Paulo, - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil
| | - Erika Kushikawa Saeki
- Regional Laboratory of Presidente Prudente, Adolfo Lutz Institute - Avenida Coronel José Soares Marcondes, 2357 - Vila Maristela, CEP: 19020-120. Presidente Prudente, SP/Brazil
| | - Paula Esteves da Silva Lima
- Regional Laboratory of Presidente Prudente, Adolfo Lutz Institute - Avenida Coronel José Soares Marcondes, 2357 - Vila Maristela, CEP: 19020-120. Presidente Prudente, SP/Brazil
| | - Edson Assunção Mareco
- Environment and Regional Development Graduate Program, University of Western São Paulo - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil
| | - Valéria Cataneli Pereira
- Faculty of Health Science, University of Western São Paulo - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil; Health Science, University of Western São Paulo - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil
| | - Lizziane Kretli Winkelströter Eller
- Faculty of Health Science, University of Western São Paulo - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil; Health Science, University of Western São Paulo - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil; Program of Animal Science, University of Western São Paulo, - Rua José Bongiovani, 700 - Cidade Universitária, CEP: 19050-920. Presidente Prudente, SP/Brazil.
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Mukhia S, Kumar A, Kumari P, Kumar R, Kumar S. Multilocus sequence based identification and adaptational strategies of Pseudomonas sp. from the supraglacial site of Sikkim Himalaya. PLoS One 2022; 17:e0261178. [PMID: 35073328 PMCID: PMC8786180 DOI: 10.1371/journal.pone.0261178] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 11/26/2021] [Indexed: 11/18/2022] Open
Abstract
Microorganisms inhabiting the supraglacial ice are biotechnologically significant as they are equipped with unique adaptive features in response to extreme environmental conditions of high ultraviolet radiations and frequent freeze-thaw. In the current study, we obtained eleven strains of Pseudomonas from the East Rathong supraglacial site in Sikkim Himalaya that showed taxonomic ambiguity in terms of species affiliation. Being one of the most complex and diverse genera, deciphering the correct taxonomy of Pseudomonas species has always been challenging. So, we conducted multilocus sequence analysis (MLSA) using five housekeeping genes, which concluded the taxonomic assignment of these strains to Pseudomonas antarctica. This was further supported by the lesser mean genetic distances with P. antarctica (0.73%) compared to P. fluorescens (3.65%), and highest ANI value of ~99 and dDDH value of 91.2 of the representative strains with P. antarctica PAMC 27494. We examined the multi-tolerance abilities of these eleven Pseudomonas strains. Indeed the studied strains displayed significant tolerance to freezing for 96 hours compared to the mesophilic control strain, while except for four strains, seven strains exhibited noteworthy tolerance to UV-C radiations. The genome-based findings revealed many cold and radiation resistance-associated genes that supported the physiological findings. Further, the bacterial strains produced two or more cold-active enzymes in plate-based assays. Owing to the polyadaptational attributes, the strains ERGC3:01 and ERGC3:05 could be most promising for bioprospection.
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Affiliation(s)
- Srijana Mukhia
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
- Department of Microbiology, Guru Nanak Dev University, Amritsar, Punjab, India
| | - Anil Kumar
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR- Human Resource Development Centre (CSIR-HRDC), Ghaziabad, Uttar Pradesh, India
| | - Poonam Kumari
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
| | - Rakshak Kumar
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
| | - Sanjay Kumar
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
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Lynch JP, Zhanel GG. Pseudomonas aeruginosa Pneumonia: Evolution of Antimicrobial Resistance and Implications for Therapy. Semin Respir Crit Care Med 2022; 43:191-218. [PMID: 35062038 DOI: 10.1055/s-0041-1740109] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Pseudomonas aeruginosa (PA), a non-lactose-fermenting gram-negative bacillus, is a common cause of nosocomial infections in critically ill or debilitated patients, particularly ventilator-associated pneumonia (VAP), and infections of urinary tract, intra-abdominal, wounds, skin/soft tissue, and bloodstream. PA rarely affects healthy individuals, but may cause serious infections in patients with chronic structural lung disease, comorbidities, advanced age, impaired immune defenses, or with medical devices (e.g., urinary or intravascular catheters, foreign bodies). Treatment of pseudomonal infections is difficult, as PA is intrinsically resistant to multiple antimicrobials, and may acquire new resistance determinants even while on antimicrobial therapy. Mortality associated with pseudomonal VAP or bacteremias is high (> 35%) and optimal therapy is controversial. Over the past three decades, antimicrobial resistance (AMR) among PA has escalated globally, via dissemination of several international multidrug resistant "epidemic" clones. We discuss the importance of PA as a cause of pneumonia including health care-associated pneumonia, hospital-acquired pneumonia, VAP, the emergence of AMR to this pathogen, and approaches to therapy (both empirical and definitive).
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Affiliation(s)
- Joseph P Lynch
- Division of Pulmonary, Critical Care Medicine, Allergy, and Clinical Immunology, Department of Medicine, The David Geffen School of Medicine at UCLA, Los Angeles, California
| | - George G Zhanel
- Department of Medical Microbiology/Infectious Diseases, University of Manitoba, Max Rady College of Medicine, Winnipeg, Manitoba, Canada
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Arora R, Goel R, Loomba P, Khanam S. Steroid-induced Pseudomonas aeruginosa endophthalmitis outbreak. J Cataract Refract Surg 2022; 48:113-115. [PMID: 34016823 DOI: 10.1097/j.jcrs.0000000000000673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 04/02/2021] [Indexed: 11/26/2022]
Affiliation(s)
- Ritu Arora
- From the Department of Ophthalmology (Guru Nanak Eye Centre), Maulana Azad Medical College, New Delhi, India (Arora, Goel, Khanam); Department of Microbiology, G B Pant Hospital, New Delhi, India (Loomba)
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Hematzadeh A, Haghkhah M. Biotyping of isolates of Pseudomonas aeruginosa isolated from human infections by RAPD and ERIC-PCR. Heliyon 2021; 7:e07967. [PMID: 34604557 PMCID: PMC8473555 DOI: 10.1016/j.heliyon.2021.e07967] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 11/04/2020] [Accepted: 09/06/2021] [Indexed: 12/01/2022] Open
Abstract
Pseudomonas aeruginosa is a significant mortality factor due to nosocomial infections in humans. P. aeruginosa has been known with severe infections, high incidence, and multiple drug resistance. The present study aims to rapidly diagnose and biotype the isolates of P. aeruginosa isolated from human infections in Shiraz hospitals and health centers. Ninety six different isolates were collected from skin, urine, sputum, blood, wound, central vein blood, body fluids and burn wounds between January 2016 and February 2017. After phenotypic confirmation, isolates were examined by PCR for molecular confirmation. Ninety three isolates were verified as P. aeruginosa in molecular analysis. Enterobacterial Repetitive Intergenic Consensus (ERIC) PCR and Random Amplified Polymorphic DNA (RAPD) were done for 67 isolates. In ERIC-PCR, the patterns obtained included 2–11 bands. The RAPD patterns obtained with primers 272 and 208 consisted of 3–11 and 1–12 bands respectively. Based on dice similarity coefficient of greater than 80%, 38, 45 and 38 groups were identified in ERIC, RAPD 272 and RAPD 208 respectively. The results showed that the isolates of P. aeruginosa have a high polymorphism apparently because of the high genetic variation.
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Affiliation(s)
- Aida Hematzadeh
- Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz 71441-11731, Iran
| | - Masoud Haghkhah
- Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz 71441-11731, Iran
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Eladawy M, El-Mowafy M, El-Sokkary MMA, Barwa R. Antimicrobial resistance and virulence characteristics in ERIC-PCR typed biofilm forming isolates of P. aeruginosa. Microb Pathog 2021; 158:105042. [PMID: 34119625 DOI: 10.1016/j.micpath.2021.105042] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 05/22/2021] [Accepted: 06/04/2021] [Indexed: 10/21/2022]
Abstract
Pseudomonas aeruginosa is a serious pathogen particularly in immunocompromised patients. In this work, 103 clinical isolates of P. aeruginosa were collected and classified into weak, moderate, and strong biofilm producers according to their biofilm forming abilities via tissue culture plate method. The antimicrobial resistance and the presence of different virulence genes were investigated via disc diffusion method and polymerase chain reaction respectively. Moreover, ERIC-PCR typing was performed to investigate the genetic diversity among the clinical isolates. No significant correlation was observed between biofilm formation and resistance to each antimicrobial agent. Similar observation was detected concerning the multidrug resistance and biofilm formation. Regarding virulence genes, algD gene was harbored by all isolates (100%). Only pelA and phzM were significantly prevalent in strong biofilm producers. Additionally, the mean virulence score was higher in strong biofilm producers (9.33) than moderate (8.62) and weak (7) biofilm producers. Moreover, there was a significant correlation between the overall virulence score of the isolates and its ability to form biofilm. ERIC-PCR genotyping revealed the presence of 99 different ERIC patterns based on 70% similarity, and the different ERIC patterns were categorized into 8 clusters. 100% similarity indicates the possibility of cross-colonization in P. aeruginosa infections.
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Affiliation(s)
- Mohamed Eladawy
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Egypt
| | - Mohammed El-Mowafy
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Egypt
| | - Mohamed M A El-Sokkary
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Egypt.
| | - Rasha Barwa
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Egypt
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11
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Abdel-Rhman SH, Rizk DE. Comparative Assessment of Different PCR-Based Typing Methods of Pseudomonas aeruginosa Isolates. Infect Drug Resist 2021; 14:1019-1035. [PMID: 33762830 PMCID: PMC7982794 DOI: 10.2147/idr.s298838] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/20/2021] [Indexed: 11/29/2022] Open
Abstract
Introduction Pseudomonas aeruginosa is one of the important causes of nosocomial infections. Analyzing the diversity of these isolates is important to control the diseases caused by them. Studies of molecular epidemiology depend on the application of typing methods. Purpose This study aims to assess the performance of PCR- based typing techniques (RAPD, ribotyping, tDNA, and ERIC) in determining the genetic diversity of 44 P. aeruginosa urinary isolates. Methods Performance parameters were analyzed for each of the tested methods. The banding pattern was assessed by calculating polymorphism, genotypic gene diversity and the effective multiplex ratio. Moreover, strain diversity, typeability, and discriminatory power were used to measure the efficiency of typing methods. The congruence among typing methods was calculated by Rand’s and Wallace coefficients. Results P-640 among RAPD primers and Ribo-2 among ribotyping primers were more informative as they gave high strain diversity, the highest number of clusters, and highest discriminatory power (ISD=70.45%, 29 clusters at 70% cutoff, DI=0.97 and ISD=75%, 25 clusters at 70% cutoff DI=0.969, respectively). Comparison of typing methods showed that RAPD-PCR gave the highest mean percent polymorphism per assay (76.85%) followed by ERIC-PCR. ERIC-PCR outperformed in most marker parameters; highest mean number of alleles, number of monomorphic bands per assay unit, mean genotypic gene diversity, effective multiplex ratio, and assay efficiency index. Calculated congruence revealed that individual methods demonstrate moderate to poor predictive power. Interestingly, this power increased by combining data obtained from another method. Conclusion RAPD primer (P-640) had more discrimination power followed by ribo-2 and ERIC. The performance and predictive power of typing methods can be improved by combining data obtained from different methods as ERIC+OPA-02 and ERIC+P-640 combinations gave complete typeability and discrimination of isolates. ERIC, ERIC+OPA-02, and ERIC+P-640 combinations can provide finer discrimination and classification of P. aeruginosa strains than the other tested methods.
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Affiliation(s)
- Shaymaa H Abdel-Rhman
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.,Department of Pharmaceutics and Pharmaceutical Biotechnology, Faculty of Pharmacy, Taibah University, AlMadinah Al Munawwarah, Saudi Arabia
| | - Dina E Rizk
- Department of Microbiology and Immunology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
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12
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Virulence genotyping of drug resistant Pseudomonas aeruginosa clinical isolates in Egypt using multiplex PCR. GENE REPORTS 2021. [DOI: 10.1016/j.genrep.2020.101000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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Parsa P, Amirmozafari N, Nowruzi B, Bahar MA. Molecular characterization of polymorphisms among Pseudomonas aeruginosa strains isolated from burn patients' wounds. Heliyon 2020; 6:e05041. [PMID: 33376816 PMCID: PMC7758517 DOI: 10.1016/j.heliyon.2020.e05041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 03/30/2020] [Accepted: 09/21/2020] [Indexed: 11/17/2022] Open
Abstract
Pseudomonas aeruginosa is one of the most common reasons for nosocomial infections. Given the high morbidity and mortality, as well as the cost of management, particularly in developing countries, burn injuries are considered important health concerns. Owing to the increased rate of resistance against antibiotics, this study aimed to isolate Pseudomonas aeruginosa strains from burn patient's wounds by analyzing antibiotic susceptibility and genetic profiling. In this regard, we explored the relationship between the nucleotide sequence and antibiotic susceptibility. In this cross-sectional study, 107 isolates of P. aeruginosa were collected from a major burn center in Tehran, Iran. The isolates were characterized with standard biochemical tests and examined by applying the Disk Diffusion method to find the patterns of sensitivity, and their genetic relationship was revealed by RAPD-PCR method. According to the antibiogram results, most of the isolates were resistant to 3 or more antibiotics tested and the most sensitivity was related to the Colistin antibiotic. RAPD-PCR method revealed a high polymorphism among P. aeruginosa isolates in Tehran. There was no significant association between the genotype groups and antibiotic susceptibility profiles. We evaluated the pattern of resistance to pathogenic organisms and identified multi-drug resistant organisms. Currently, Colistin antibiotic is the most suitable treatment option for burned patients. RAPD-PCR is a genotyping method with high efficiency for typing and categorizing different isolates of MDR-P. aeruginosa.
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Affiliation(s)
- Parastoo Parsa
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Nour Amirmozafari
- Microbiology Department, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Bahareh Nowruzi
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Mohammad Ali Bahar
- Burn Research Center, Iran University of Medical Sciences, Tehran, Iran
- Corresponding author.
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14
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Hashemizadeh Z, Mansouri S, Pahlavanzadeh F, Morones-Ramírez JR, Tabatabaeifar F, Motamedifar M, Gholizadeh A, Kalantar-Neyestanaki D. Evaluation of chromosomally and acquired mechanisms of resistance to carbapenem antibiotics among clinical isolates of Pseudomonas aeruginosa in Kerman, Iran. GENE REPORTS 2020. [DOI: 10.1016/j.genrep.2020.100918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Antimicrobials as Single and Combination Therapy for Colistin-Resistant Pseudomonas aeruginosa at a University Hospital in Thailand. Antibiotics (Basel) 2020; 9:antibiotics9080475. [PMID: 32756327 PMCID: PMC7459651 DOI: 10.3390/antibiotics9080475] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/29/2020] [Accepted: 07/31/2020] [Indexed: 11/24/2022] Open
Abstract
Global infections with colistin-resistant Pseudomonas aeruginosa (CoR-PA) are increasing; there are currently very few studies focused on the antimicrobial susceptibility of CoR-PA isolates, and none from Thailand. Here, we investigated the impact of various antimicrobials, alone and in combination, via the in vitro testing of CoR-PA clinical isolates. Eighteen CoR-PA isolates were obtained from patients treated at Phramongkutklao Hospital from January 2010 through June 2019; these were classified into six different clonal types by using the enterobacterial repetitive intergenic consensus (ERIC)-PCR method, with a high prevalence of Group A (27.8%). The antimicrobial susceptibility was determined as the minimal inhibitory concentrations (MICs) using the epsilometer-test (E-test) method. The synergistic activities of six antimicrobial combinations were reported via the fractional-inhibitory-concentration index. All CoR-PA isolates were susceptible to amikacin, meropenem, and ceftolozane/tazobactam, but only 5.56% were susceptible to imipenem. In vitro synergistic activities were detected for amikacin with aztreonam, piperacillin/tazobactam, meropenem, and ceftazidime for 16.67%, 11.11%, 11.11%, and 5.55%, respectively. One CoR-PA isolate carried the blaVIM metallo-β-lactamase gene; none carried mcr-1 genes or detected plasmid-mediated AmpC β-lactamase or an overproduction of chromosomal AmpC β-lactamase. Seven CoR-PA isolates (38.89%) were capable of biofilm formation. In conclusion, CoR-PA isolates are highly susceptible to antimicrobials; the synergy observed in response to the various agents should be examined in a clinical setting.
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Yang Y, Shen W, Zhong Q, Chen Q, He X, Baker JL, Xiong K, Jin X, Wang J, Hu F, Le S. Development of a Bacteriophage Cocktail to Constrain the Emergence of Phage-Resistant Pseudomonas aeruginosa. Front Microbiol 2020; 11:327. [PMID: 32194532 PMCID: PMC7065532 DOI: 10.3389/fmicb.2020.00327] [Citation(s) in RCA: 87] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 02/14/2020] [Indexed: 12/31/2022] Open
Abstract
With the emergence of multidrug-resistant and extensively drug-resistant bacterial pathogens, phage therapy and other alternative or additional therapeutic modalities are receiving resurgent attention. One of the major obstacles in developing effective phage therapies is the evolution of phage resistance in the bacterial host. When Pseudomonas aeruginosa was infected with a phage that uses O-antigen as receptor, phage resistances typically achieved through changing or loss of O-antigen structure. In this study, we showed that dsRNA phage phiYY uses core lipopolysaccharide as receptor and therefore efficiently kills the O-antigen deletion mutants. Furthermore, by phage training, we obtained PaoP5-m1, a derivative of dsDNA phage PaoP5, which is able to infect mutants with truncated O-antigen. We then generated a cocktail by mixing phiYY and PaoP5-m1 with additional three wide host range P. aeruginosa phages. The phage cocktail was effective against a diverse selection of clinical isolates of P. aeruginosa, and in the short-term constrained the appearance of the phage-resistant mutants that had beleaguered the effectiveness of single phage. Resistance to the 5-phage cocktail emerges after several days, and requires mutations in both wzy and migA Thus, this study provides an alternative strategy for designing phage cocktail and phage therapy.
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Affiliation(s)
- Yuhui Yang
- Department of Microbiology, Army Medical University, Chongqing, China
| | - Wei Shen
- Department of Medical Laboratory, The General Hospital of Western Theater Command, Chengdu, China
| | - Qiu Zhong
- Department of Clinical Laboratory, Daping Hospital, Army Medical University, Chongqing, China
| | - Qian Chen
- Biomedical Analysis Center, Army Medical University, Chongqing, China
| | - Xuesong He
- The Forsyth Institute, Cambridge, MA, United States
| | - Jonathon L Baker
- Genomic Medicine Group, J. Craig Venter Institute, La Jolla, CA, United States
| | - Kun Xiong
- Department of Microbiology, Army Medical University, Chongqing, China
| | - Xiaoling Jin
- Department of Microbiology, Army Medical University, Chongqing, China
| | - Jing Wang
- Department of Microbiology, Army Medical University, Chongqing, China
| | - Fuquan Hu
- Department of Microbiology, Army Medical University, Chongqing, China
| | - Shuai Le
- Department of Microbiology, Army Medical University, Chongqing, China
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17
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Lila G, Mulliqi G, Raka L, Kurti A, Bajrami R, Azizi E. Molecular epidemiology of Pseudomonas aeruginosa in University Clinical Center of Kosovo. Infect Drug Resist 2018; 11:2039-2046. [PMID: 30464546 PMCID: PMC6208869 DOI: 10.2147/idr.s174940] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Background Pseudomonas aeruginosa is an important opportunistic pathogen. It is frequently resistant to many commonly used antibiotics and develops easily resistant forms. Colonization with this organism often precedes infection, and its prevention is, therefore, critical. There is no information on molecular epidemiological investigation of outbreaks caused by P. aeruginosa in Kosovo. Materials and methods The present investigation was carried out to enlighten molecular epidemiology of P. aeruginosa in University Clinical Center of Kosovo (UCCK) using pulsed-field gel electrophoresis (PFGE). During our study period, 80 isolates of P. aeruginosa were included. The overall antimicrobial susceptibility pattern showed a high level of resistance against amino-glycosides and the lowest against carbapenems. Forty isolates of P. aeruginosa were subjected to genotyping, of whom 31 (77.5%) were male patients and nine (22.5%) were female patients. Results The most common diagnosis upon admission was polytrauma, sepsis, and coma cerebri. Majority of the patients were in mechanical ventilation (76.2%). Bacterial isolates were most frequently recovered from respiratory tract specimens (60%) and wounds (22.5%). Majority of the samples were recovered from intensive care unit (ICU) (47.5%). The length of ICU stay was higher compared to patients from other units. Genotype analysis of P. aeruginosa isolates identified seven distinct PFGE patterns, with the predominance of PFGE clone A (40%) and PFGE clone N (12.5%). All of these isolates were indistinguishable. The appearance of the indistinguishable genotypes supports the possibility of a cross and horizontal transmission of P. aeruginosa due to insufficient preventive measures. Conclusion The results emphasize the need for strict infection control measures to prevent the nosocomial transmission of P. aeruginosa in our hospital.
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Affiliation(s)
- Greta Lila
- Department of Microbiology,Faculty of Medicine University of Pristina, Pristina, Kosovo, .,Department of Microbiology, National Institute of Public Health of Kosovo, Pristina, Kosovo,
| | - Gjyle Mulliqi
- Department of Microbiology,Faculty of Medicine University of Pristina, Pristina, Kosovo, .,Department of Microbiology, National Institute of Public Health of Kosovo, Pristina, Kosovo,
| | - Lul Raka
- Department of Microbiology,Faculty of Medicine University of Pristina, Pristina, Kosovo, .,Department of Microbiology, National Institute of Public Health of Kosovo, Pristina, Kosovo,
| | - Arsim Kurti
- Department of Microbiology, National Institute of Public Health of Kosovo, Pristina, Kosovo,
| | - Rrezarta Bajrami
- Department of Microbiology,Faculty of Medicine University of Pristina, Pristina, Kosovo, .,Department of Microbiology, National Institute of Public Health of Kosovo, Pristina, Kosovo,
| | - Elvir Azizi
- Food science and Technology, Faculty of Agriculture and Veterinary, University of Pristina, Pristina, Kosovo
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Taslı H, Akbıyık A, Topaloğlu N, Alptüzün V, Parlar S. Photodynamic antimicrobial activity of new porphyrin derivatives against methicillin resistant Staphylococcus aureus. J Microbiol 2018; 56:828-837. [PMID: 30353469 DOI: 10.1007/s12275-018-8244-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 08/02/2018] [Accepted: 08/02/2018] [Indexed: 01/21/2023]
Abstract
Methicillin resistant Staphylococcus aureus (MRSA) with multiple drug resistance patterns is frequently isolated from skin and soft tissue infections that are involved in chronic wounds. Today, difficulties in the treatment of MRSA associated infections have led to the development of alternative approaches such as antimicrobial photodynamic therapy. This study aimed to investigate photoinactivation with cationic porphyrin derivative compounds against MRSA in in-vitro conditions. In the study, MRSA clinical isolates with different antibiotic resistance profiles were used. The newly synthesized cationic porphyrin derivatives (PM, PE, PPN, and PPL) were used as photosensitizer, and 655 nm diode laser was used as light source. Photoinactivation experiments were performed by optimizing energy doses and photosensitizer concentrations. In photoinactivation experiments with different energy densities and photosensitizer concentrations, more than 99% reduction was achieved in bacterial cell viability. No decrease in bacterial survival was observed in control groups. It was determined that there was an increase in photoinactivation efficiency by increasing the energy dose. At the energy dose of 150 J/cm2 a survival reduction of over 6.33 log10 was observed in each photosensitizer type. While 200 μM PM concentration was required for this photoinactivation, 12.50 μM was sufficient for PE, PPN, and PPL. In our study, antimicrobial photodynamic therapy performed with cationic porphyrin derivatives was found to have potent antimicrobial efficacy against multidrug resistant S. aureus which is frequently isolated from wound infections.
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Affiliation(s)
- Hüseyin Taslı
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, Ege University, 35100, Izmir, Turkey.
| | - Ayse Akbıyık
- Department of Nursing, Faculty of Health Sciences, Izmir Katip Celebi University, 35620, Izmir, Turkey
| | - Nermin Topaloğlu
- Department of Biomedical Engineering, Faculty of Engineering and Architecture Izmir Katip Celebi University, 35620, Izmir, Turkey
| | - Vildan Alptüzün
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Ege University, 35100, Izmir, Turkey
| | - Sülünay Parlar
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Ege University, 35100, Izmir, Turkey
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Xue M, Ji X, Liang H, Liu Y, Wang B, Sun L, Li W. The effect of fucoidan on intestinal flora and intestinal barrier function in rats with breast cancer. Food Funct 2018; 9:1214-1223. [PMID: 29384543 DOI: 10.1039/c7fo01677h] [Citation(s) in RCA: 97] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Recent research studies have shown that the intestinal flora are related to the occurrence and progress of breast cancer. This study investigates the effect of fucoidan on intestinal flora and intestinal barrier function in rats with 7,12-dimethylbenz[a]anthracene (DMBA)-induced breast cancers. Sixty female Sprague-Dawley rats were randomly assigned to the control group, the model group, and the F1 and F2 groups, which were fed fucoidan at concentrations of 200 and 400 mg per kg bw (body weight), respectively. Intestinal histopathological analysis was performed and 16S rDNA high-throughput sequencing was used to provide an overview of the intestinal flora composition. The contents of d-lactic acid (d-LA), diamine oxidase (DAO) and endotoxin in plasma were detected by ELISA. Expression levels of the tight junction (TJ) proteins, phosphorylated p38 MAPK and ERK1/2 were measured using western blotting. Our results suggested that the intestinal wall of the model group was damaged. However, after fucoidan intervention, the villi were gradually restored. ELISA showed that the levels of plasma endotoxin, d-LA and DAO decreased in the F1 and F2 groups compared to those in the model group. Fucoidan treatment also increased the expressions of ZO-1, occludin, claudin-1 and claudin-8. Furthermore, the expression levels of phosphorylated p38 MAPK and ERK1/2 were upregulated in fucoidan treatment groups. The results of 16S rDNA high-throughput sequencing indicated that fucoidan increased the diversity of the intestinal microbiota and induced changes in microbial composition, with the increased Bacteroidetes/Firmicutes phylum ratio. In conclusion, the supplement of fucoidan could improve the fecal microbiota composition and repair the intestinal barrier function. The study suggested the use of fucoidan as an intestinal flora modulator for potential prevention of breast cancer.
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Affiliation(s)
- Meilan Xue
- Basic Medical College, Qingdao University of Medicine, 38 Dengzhou Road, Qingdao 266021, PR China
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Abstract
Background This study investigated the protective effect of aplysin on the liver and its influence on inflammation and the gut microbiota in rats with ethanol-induced liver injury. Methods Male Sprague-Dawley rats were randomly assigned to an alcohol-containing liquid diet, control liquid diet or treatment with aplysin for 8 weeks. Hepatic and intestinal histopathological analysis was performed, and cytokine levels and the intestinal mucosal barrier were assessed. Enterobacterial repetitive intergenic consensus polymerase chain reaction (ERIC-PCR) and 16S rDNA high-throughput sequencing were performed to provide an overview of the gut microbiota composition. Results Chronic alcohol exposure caused liver damage in rats. Serum aspartate aminotransferase (AST), aminotransferase (ALT), alkaline phosphatase (ALP) and triglyceride (TG) activities in liver tissue were higher than in the control group. Alcohol administration elevated the levels of serum transforming growth factor-β (TGF-β) and tumor necrosis factor-α (TNF-α) and reduced interleukin-10 (IL-10) levels compared with those of control rats. In addition, the levels of plasma endotoxin, diamine oxidase (DAO), and fatty acid-binding protein 2 (FABP2) in the alcohol group were higher than in the control group. The results of ERIC-PCR indicated that aplysin treatment shifted the overall structure of the ethanol-disrupted gut microbiota toward that of the control group. One hundred twenty to 190 genera of bacteria were detected by high throughput sequencing. Alcohol-induced changes in the gut microbial composition were detected at the genus level. These alcohol-induced effects could be reversed with aplysin treatment. Conclusions These results suggest that aplysin exerts a protective effect on ethanol-induced hepatic injury in rats by normalizing fecal microbiota composition and repairing intestinal barrier function.
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Molecular Analysis of Pseudomonas aeruginosa Strains Isolated from Burn Patients by Repetitive Extragenic Palindromic-PCR (rep-PCR). IRANIAN RED CRESCENT MEDICAL JOURNAL 2017. [DOI: 10.5812/ircmj.43508] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Characterization of the first double-stranded RNA bacteriophage infecting Pseudomonas aeruginosa. Sci Rep 2016; 6:38795. [PMID: 27934909 PMCID: PMC5146939 DOI: 10.1038/srep38795] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 11/14/2016] [Indexed: 11/29/2022] Open
Abstract
Bacteriophages (phages) are widely distributed in the biosphere and play a key role in modulating microbial ecology in the soil, ocean, and humans. Although the role of DNA bacteriophages is well described, the biology of RNA bacteriophages is poorly understood. More than 1900 phage genomes are currently deposited in NCBI, but only 6 dsRNA bacteriophages and 12 ssRNA bacteriophages genome sequences are reported. The 6 dsRNA bacteriophages were isolated from legume samples or lakes with Pseudomonas syringae as the host. Here, we report the first Pseudomonas aeruginosa phage phiYY with a three-segmented dsRNA genome. phiYY was isolated from hospital sewage in China with the clinical P. aeruginosa strain, PAO38, as a host. Moreover, the dsRNA phage phiYY has a broad host range, which infects 99 out of 233 clinical P. aeruginosa strains isolated from four provinces in China. This work presented a detailed characterization of the dsRNA bacteriophage infecting P. aeruginosa.
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