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Zhou L, Yang C, Zhang X, Yao J, Chen L, Tu Y, Li X. Characterization of a novel Tn6485h transposon carrying both blaIMP-45 and blaAFM-1 integrated into the IncP-2 plasmid in a carbapenem-resistant Pseudomonas aeruginosa. J Glob Antimicrob Resist 2023; 35:307-313. [PMID: 37879457 DOI: 10.1016/j.jgar.2023.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 09/21/2023] [Accepted: 10/14/2023] [Indexed: 10/27/2023] Open
Abstract
OBJECTIVES To characterize a carbapenem-resistant Pseudomonas aeruginosa (CRPA) with an IncP-2 plasmid containing a novel transposon, Tn6485h, which carries both blaIMP-45 and blaAFM-1. METHODS Antimicrobial susceptibility testing and filter mating experiment were performed on PA942. The stability of the plasmid carrying both blaIMP-45 and blaAFM-1 was carried out. We determined the growth rate of the transconjugant to investigate fitness cost. Additionally, whole-genome sequencing and genomic analysis were performed on PA942. RESULTS PA942 strain was resistant to most antibiotics except for ciprofloxacin and colistin. Bioinformatics analysis confirmed that PA942 contains an IncP-2 plasmid with a novel transposon Tn6485h carrying both blaIMP-45 and blaAFM-1. The plasmid pPA942-IMP45 can be transferred into recipient bacteria PAO1Rif with an efficiency of 2.2 × 10-7 and the transconjugant PAO1Rif/ pPA942-IMP45 can be stably inherited for 10 generations in the absence of antibiotics. CONCLUSION We report a carbapenem-resistant P. aeruginosa strain with an IncP-2 plasmid containing a novel transposon, Tn6485h, which carries both blaIMP-45 and blaAFM-1. The IncP-2 plasmid and transposon Tn6485h may contribute to the spread of MBL genes. Therefore, effective measures to prevent the spread of these plasmids should be taken.
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Affiliation(s)
- Longjie Zhou
- Centre of Laboratory Medicine, Department of Clinical Laboratory, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Chuanxin Yang
- Department of Laboratory Medicine, Affiliated Sixth People's Hospital South Campus, Shanghai Jiaotong University, Shanghai, China
| | - Xiaofan Zhang
- Centre of Laboratory Medicine, Department of Clinical Laboratory, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Jiayao Yao
- Centre of Laboratory Medicine, Department of Clinical Laboratory, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Lingxia Chen
- Centre of Laboratory Medicine, Department of Clinical Laboratory, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Yuexing Tu
- Department of Critical Care Medicine, Tongde Hospital of Zhejiang Province, Hangzhou, Zhejiang, China.
| | - Xi Li
- Centre of Laboratory Medicine, Department of Clinical Laboratory, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang, China.
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2
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Li X, Gu N, Huang TY, Zhong F, Peng G. Pseudomonas aeruginosa: A typical biofilm forming pathogen and an emerging but underestimated pathogen in food processing. Front Microbiol 2022; 13:1114199. [PMID: 36762094 PMCID: PMC9905436 DOI: 10.3389/fmicb.2022.1114199] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 12/30/2022] [Indexed: 01/26/2023] Open
Abstract
Pseudomonas aeruginosa (P. aeruginosa) is a notorious gram-negative pathogenic microorganism, because of several virulence factors, biofilm forming capability, as well as antimicrobial resistance. In addition, the appearance of antibiotic-resistant strains resulting from the misuse and overuse of antibiotics increases morbidity and mortality in immunocompromised patients. However, it has been underestimated as a foodborne pathogen in various food groups for instance water, milk, meat, fruits, and vegetables. Chemical preservatives that are commonly used to suppress the growth of food source microorganisms can cause problems with food safety. For these reasons, finding effective, healthy safer, and natural alternative antimicrobial agents used in food processing is extremely important. In this review, our ultimate goal is to cover recent advances in food safety related to P. aeruginosa including antimicrobial resistance, major virulence factors, and prevention measures. It is worth noting that food spoilage caused by P. aeruginosa should arouse wide concerns of consumers and food supervision department.
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Affiliation(s)
- Xuejie Li
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Engineering Research Center of Starch and Vegetable Protein Processing Ministry of Education, South China University of Technology, Guangzhou, China
- Research Institute for Food Nutrition and Human Health, Guangzhou, China
| | - Nixuan Gu
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Engineering Research Center of Starch and Vegetable Protein Processing Ministry of Education, South China University of Technology, Guangzhou, China
| | - Teng Yi Huang
- Department of Diagnostics, Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Feifeng Zhong
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Engineering Research Center of Starch and Vegetable Protein Processing Ministry of Education, South China University of Technology, Guangzhou, China
| | - Gongyong Peng
- State Key Laboratory of Respiratory Diseases, National Clinical Research Center for Respiratory Diseases, National Center for Respiratory Medicine, Guangzhou Institute of Respiratory Health, the First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
- *Correspondence: Gongyong Peng, ✉
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3
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Xu Z, Lin X, Soteyome T, Ye Y, Chen D, Yang L, Liu J. Significant downtrend of antimicrobial resistance rate and rare β-lactamase genes and plasmid replicons carriage in clinical Pseudomonas aeruginosa in Southern China. Microb Pathog 2021; 159:105124. [PMID: 34364978 DOI: 10.1016/j.micpath.2021.105124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 08/03/2021] [Accepted: 08/04/2021] [Indexed: 11/29/2022]
Abstract
OBJECTIVES Pseudomonas aeruginosa is a medically important pathogen showing intrinsic low permeability to various antimicrobial agents and its potential to acquire multiple resistance mechanism. A longitudinal surveillance aimed to investigate the antimicrobial resistance and its determinants of Pseudomonas aeruginosa in Southern China. A total of 2163 P. aeruginosa isolates were obtained from patients in Southern China during 2004-2016. METHODS The antimicrobial susceptibility of the isolates was performed by disk diffusion and Vitek 2 automated system and interpreted according to the Clinical and Laboratory Standard Institute (CLSI) 2015. RESULTS A significant downtrend of resistant rate (>10.0%) was observed for tested antibiotic agents including ciprofloxacin (>30.0%), gentamicin (29.0%), tobramycin (24.2%) and ceftazidime (24.0%) except for aztreonam and amikacin. A total of 269 randomly selected isolates were further studied on the carriage of β-lactam resistance genes by using 7 groups of multiplex PCRs targeting on 20 genes. β-lactam resistance genes were rarely detected with a rate lower than 8%. Among all β-lactam resistance genes, blaSHV acquired the highest identification rate (18/269, 6.7%), followed by blaOXA-1-like (6/269, 2.2%) and blaPER (6/269, 2.2%). In addition, 8 different plasmid replicons were amplified using 8 groups of multiplex PCRs including 18 sets of primers. Only five plasmid replicons were identified in 5 different P. aeruginosa isolates. Insignificant clonal relatedness among the positive strains identified by regular PCR were further verified by randomly amplified polymorphic DNA (RAPD)-PCR. CONCLUSION This study has provided comprehensive knowledge on current antimicrobial resistance, β-lactam resistance genes and plasmid replicons carriage in a large scale of clinical P. aeruginosa isolates.
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Affiliation(s)
- Zhenbo Xu
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Engineering Research Center of Starch and Vegetable Protein Processing Ministry of Education, South China University of Technology, Guangzhou, 510640, China; Department of Clinical Pharmacy and Translational Science, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, 38103, USA; Home Economics Technology, Rajamangala University of Technology Phra Nakhon, Bangkok, Thailand; Research Institute for Food Nutrition and Human Health, Guangzhou, China
| | - Xin Lin
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Engineering Research Center of Starch and Vegetable Protein Processing Ministry of Education, South China University of Technology, Guangzhou, 510640, China
| | - Thanapop Soteyome
- Home Economics Technology, Rajamangala University of Technology Phra Nakhon, Bangkok, Thailand
| | - Yanrui Ye
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Dingqiang Chen
- Department of Laboratory Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, China
| | - Ling Yang
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, 510120, China
| | - Junyan Liu
- Department of Civil and Environmental Engineering, University of Maryland, College Park, MD, 20742, USA.
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Wang J, Ye C, Fan X, Liu J, Huang Y, Lin X, Soteyome T, Chen L, Liang Y, Yu G, Xu Z. Letter to the Editor: Four Novel Types of Gene Cassettes from Carbapenem-Resistant Pseudomonas aeruginosa in Southern China-First Report of qnrVC7. Microb Drug Resist 2021; 27:1011-1012. [PMID: 33635135 DOI: 10.1089/mdr.2020.0453] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Affiliation(s)
- Juexin Wang
- Ganzhou Center for Disease Control and Prevention, Ganzhou, P.R. China
| | - Congxiu Ye
- Department of Dermatology and Venerology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, P.R. China
| | - Xiaoyi Fan
- Clinical Laboratory Center, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
| | - Juzhen Liu
- Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, School of Food Science and Engineering, South China University of Technology, Guangzhou, P.R. China
| | - Yunzu Huang
- Clinical Laboratory Center, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
| | - Xin Lin
- Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, School of Food Science and Engineering, South China University of Technology, Guangzhou, P.R. China
| | - Thanapop Soteyome
- Home Economics Technology, Rajamangala University of Technology Phra Nakhon, Bangkok, Thailand
| | - Ling Chen
- Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, School of Food Science and Engineering, South China University of Technology, Guangzhou, P.R. China
| | - Yi Liang
- Guangdong Zhongqing Font Biochemical Science and Technology Co. Ltd., Maoming, Guangdong, P.R. China
| | - Guangchao Yu
- Clinical Laboratory Center, The First Affiliated Hospital of Jinan University, Guangzhou, P.R. China
| | - Zhenbo Xu
- Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, School of Food Science and Engineering, South China University of Technology, Guangzhou, P.R. China
- Home Economics Technology, Rajamangala University of Technology Phra Nakhon, Bangkok, Thailand
- Department of Clinical Pharmacy and Translational Science, College of Pharmacy, University of Tennessee Health Science Center, Memphis, Tennessee, USA
- Department of Laboratory Medicine, The Second Affiliated Hospital of Shantou University Medical College, Shantou, P.R. China
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5
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Zhong H, Deng H, Li M, Zhong H. Bioprocessing and integration of a high flux screening systematic platform based on isothermal amplification for the detection on 8 common pathogens. Bioprocess Biosyst Eng 2021; 44:977-984. [PMID: 32862325 PMCID: PMC8096746 DOI: 10.1007/s00449-020-02423-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 08/05/2020] [Indexed: 11/23/2022]
Abstract
During a large variety of common pathogens, E. coli, P. aeruginosa, MRSA, MRCNS, V. parahaemolyticus, L. monocytogenes and Salmonella are the leading pathogens responsible for large number of human infections and diseases. In this study, a high flux screening based on nucleic acid isothermal amplification technique has been developed. For the 8 common pathogens, species-specific targets had been selected and analyzed for their unique specificity. After optimization, separate LAMP reaction assays had been bioprocessed and integrated into one systematic detection platform, including 8 strips (PCR tubes) and 96-well plates. Eight standard strains verified for the accuracy. Application of the established high flux screening platform was used for detection for 48 samples in 4 different 96-well plates, with 2 groups of 2 operators using double-blind procedure. The accuracy of 100% was obtained, with the total time consumption as 66-75 min (for 12 samples detection on 8 different pathogens). As concluded, through the bioprocess of the systematic platform based on LAMP technique, it's been demonstrated to be capable of simultaneous detection of 8 pathogens, with high sensitivity, specificity, rapidity and convenience.
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Affiliation(s)
- Huamin Zhong
- Department of Clinical Laboratory, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510120, China
| | - Hongwei Deng
- Shenzhen Key Laboratory of Ophthalmology, Ocular Trauma Treatment and Stem Cell Differentiation Public Service Platform of Shenzhen, Shenzhen Eye Hospital, Shenzhen, 518040, China
| | - Ming Li
- Shenzhen Key Laboratory of Ophthalmology, Ocular Trauma Treatment and Stem Cell Differentiation Public Service Platform of Shenzhen, Shenzhen Eye Hospital, Shenzhen, 518040, China
| | - Huahong Zhong
- Shenzhen Key Laboratory of Ophthalmology, Ocular Trauma Treatment and Stem Cell Differentiation Public Service Platform of Shenzhen, Shenzhen Eye Hospital, Shenzhen, 518040, China.
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6
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Li Y, Qiu Y, Ye C, Chen L, Liang Y, Huang TY, Zhang L, Liu J. "One-step" characterization platform for pathogenic genetics of Staphylococcus aureus. Bioprocess Biosyst Eng 2021; 44:985-994. [PMID: 33112989 DOI: 10.1007/s00449-020-02449-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 09/14/2020] [Indexed: 02/05/2023]
Abstract
Staphylococcus aureus (S. aureus) is an important human pathogen causing a variety of life-threatening diseases. In recent years, the health problem caused by S. aureus contaminated food has become a global health problem. S. aureus can express various pathogenic factors, mainly used for adhesion, colonization, invasion and infection of the host. Therefore, rapid and accurate detection of virulence genes in S. aureus is necessary to prevent outbreaks caused by this pathogen. PCR is a useful tool for rapid detection of foodborne pathogens. The objective of this study was to detect the presence of major toxin genes in S. aureus, including sea, seb, sec, see, pvl and tsst, by using a PCR plate. Of the 13 strains tested, 12 (92.3%) were found to be positive for one or more toxin genes. This study realized the one-step detection of main toxin factors in S. aureus.
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Affiliation(s)
- Yanmei Li
- Department of Haematology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, China
| | - Yisen Qiu
- Department of Spine Surgery, The Second Affiliated Hospital of Shantou University Medical College, North Dongxia Road, Shantou, 515041, Guangdong, China
| | - Congxiu Ye
- Department of Dermato-Venereology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510640, China
| | - Ling Chen
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, 510640, China
| | - Yi Liang
- Guangdong Zhongqing Font Biochemical Science and Technology Co. Ltd., Maoming, 525427, Guangdong, China
| | - Teng-Yi Huang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Li Zhang
- Department of Haematology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, China
| | - Junyan Liu
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, 510640, China.
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7
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Jiang H, Wang K, Yan M, Ye Q, Lin X, Chen L, Ye Y, Zhang L, Liu J, Huang T. Pathogenic and Virulence Factor Detection on Viable but Non-culturable Methicillin-Resistant Staphylococcus aureus. Front Microbiol 2021; 12:630053. [PMID: 33841357 PMCID: PMC8027501 DOI: 10.3389/fmicb.2021.630053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 01/04/2021] [Indexed: 02/05/2023] Open
Abstract
Food safety and foodborne infections and diseases have been a leading hotspot in public health, and methicillin-resistant Staphylococcus aureus (MRSA) has been recently documented to be an important foodborne pathogen, in addition to its recognition to be a leading clinical pathogen for some decades. Standard identification for MRSA has been commonly performed in both clinical settings and food routine detection; however, most of such so-called "standards," "guidelines," or "gold standards" are incapable of detecting viable but non-culturable (VBNC) cells. In this study, two major types of staphylococcal food poisoning (SFP), staphylococcal enterotoxins A (sea) and staphylococcal enterotoxins B (seb), as well as the panton-valentine leucocidin (pvl) genes, were selected to develop a cross-priming amplification (CPA) method. Limit of detection (LOD) of CPA for sea, seb, and pvl was 75, 107.5, and 85 ng/μl, indicating that the analytical sensitivity of CPA is significantly higher than that of conventional PCR. In addition, a rapid VBNC cells detection method, designated as PMA-CPA, was developed and further applied. PMA-CPA showed significant advantages when compared with PCR assays, in terms of rapidity, sensitivity, specificity, and accuracy. Compared with conventional VBNC confirmation methods, the PMA-CPA showed 100% accordance, which had demonstrated that the PMA-CPA assays were capable of detecting different toxins in MRSA in VBNC state. In conclusion, three CPA assays were developed on three important toxins for MRSA, and in combination with PMA, the PMA-CPA assay was capable of detecting virulent gene expression in MRSA in the VBNC state. Also, the above assays were further applied to real samples. As concluded, the PMA-CPA assay developed in this study was capable of detecting MRSA toxins in the VBNC state, representing first time the detection of toxins in the VBNC state.
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Affiliation(s)
- Hua Jiang
- Department of Haematology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Kan Wang
- Center for Translational Medicine, The Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Muxia Yan
- Department of Haematology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Qian Ye
- Department of Haematology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Xiaojing Lin
- Department of Haematology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Ling Chen
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, China
| | - Yanrui Ye
- School of Biological Science and Engineering, South China University of Technology, Guangzhou, China
| | - Li Zhang
- Department of Haematology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Junyan Liu
- Department of Civil and Environmental Engineering, University of Maryland, College Park, College Park, MD, United States
- *Correspondence: Junyan Liu,
| | - Tengyi Huang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Shantou University Medical College, Shantou, China
- Tengyi Huang,
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8
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Chen DQ, Huang T, Wang Q, Bai C, Yang L. Analysis on the virulomes and resistomes of multi-drug resistance clinical Escherichia coli isolates, as well as the interactome with gut microbiome. Microb Pathog 2020; 148:104423. [PMID: 32768515 DOI: 10.1016/j.micpath.2020.104423] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 07/07/2020] [Accepted: 07/21/2020] [Indexed: 02/05/2023]
Abstract
Escherichia coli is one of the most diverse microbial species. Pathogenic E. coli is capable of causing various diseases in humans, including several types of diarrhea, urinary tract infections, sepsis, and meningitis. This study focused on the antibiotic susceptibility profile and genomic analysis of a clinical E. coli Guangzhou-Eco330 isolated from a hospitalized 8-year-old female patient suffered from pulmonary infection in 2017. Susceptibility to 15 antibiotics were determined using Vitek2™ Automated Susceptibility System and Etest strips and interpreted based on CLSI guidelines. The genome was sequenced using Illumina Hiseq 2500 platform and assembled de novo using Velvet, followed by bioinformatics analysis. The genome has a length of 5,132,642 bp and contains 4989 predicted genes with an average GC content of 50.51%. The carriage of rfbE gene suggested the strain belonging to O157. In the genome, 70 non-coding RNAs, 50 repeat sequences, 18 transposons, 78 GIs, 9 CRISPRs, and 3 large prophages were identified. 37 PHI related genes and 108 virulence genes were determined to contribute to its pathogenicity. Specifically, the acquisition of multiple antibiotic resistance genes including blaCTX-M-55, blaOXA-10, blaCMY-48, tetB, and qnrS1 contributed to its resistance to penicillins, telracyclines, cephalosporin, and quinolones. The understanding of the genome may aid in further study on the clinical control of multi-drug resistance E. coli.
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Affiliation(s)
- Ding-Qiang Chen
- Department of Laboratory Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China.
| | - Tengyi Huang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China.
| | - Qun Wang
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.
| | - Caiying Bai
- Guangdong Women and Children Hospital, Guangzhou, 510010, China.
| | - Ling Yang
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.
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Chen W, Chen H, Fu S, Lin X, Zheng Z, Zhang J. Microbiome characterization and re-design by biologic agents for inflammatory bowel disease insights. Bioprocess Biosyst Eng 2020; 44:929-939. [PMID: 32458051 DOI: 10.1007/s00449-020-02380-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 05/12/2020] [Indexed: 12/14/2022]
Abstract
The therapeutic effect of inflammatory bowel disease has improved in the past decades, but most of patients cannot tolerate, do not respond to drugs, or relapse after treating with conventional therapy. Therefore, new and more effective treatment methods are still needed in treatment of IBD. In this review, we will discuss the relevant mechanisms and the latest research progress of biologics (anti-TNF treatments, interleukin inhibitors, integrin inhibitors, antisense oligonucleotide, and JAK inhibitors) for IBD, focus on the efficacy and safety of drugs for moderate-to-severe IBD, and summarize the clinical status and future development direction of biologics in IBD.
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Affiliation(s)
- Wenshuo Chen
- Department of Gastrointestinal Surgery, Zhujiang Hospital, Southern Medical University, GuangZhou, 510280, China
| | - Haijin Chen
- Department of Gastrointestinal Surgery, Zhujiang Hospital, Southern Medical University, GuangZhou, 510280, China.
| | - Shudan Fu
- Ophthalmology Department, Zhujiang Hospital, Southern Medical University, GuangZhou, 510280, China
| | - Xiaohua Lin
- Department of Gastrointestinal Surgery, Zhujiang Hospital, Southern Medical University, GuangZhou, 510280, China
| | - Zheng Zheng
- Department of Gastrointestinal Surgery, Zhujiang Hospital, Southern Medical University, GuangZhou, 510280, China
| | - Jinlong Zhang
- Department of Gastrointestinal Surgery, Zhujiang Hospital, Southern Medical University, GuangZhou, 510280, China
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10
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Liu M, Ma J, Jia W, Li W. Antimicrobial Resistance and Molecular Characterization of Gene Cassettes from Class 1 Integrons in Pseudomonas aeruginosa Strains. Microb Drug Resist 2020; 26:670-676. [PMID: 32407190 PMCID: PMC7307683 DOI: 10.1089/mdr.2019.0406] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
We investigated the antibiotic-resistance phenotypes and molecularly characterized class 1 integron gene cassettes from 113 Pseudomonas aeruginosa isolates from patients. Primers specific for the class 1 integron integrase (intI1) gene were used to screen for these integrons using polymerase chain reactions (PCRs). The variable regions of the integrons were PCR-amplified and sequenced. Sputum was the most common specimen (69.9%; 79/113) followed by aseptic sites (21.2%; 24/113). Of the 113 isolates with phenotypic resistance to the tested antimicrobials, the highest resistances were to ciprofloxacin (CIP) (26.55%), imipenem (IPM) (23.89%), and meropenem (MEM) (23%). Carbapenem-sensitive P. aeruginosa (CS-PA) isolates displayed 23 patterns, and the predominant multidrug resistance phenotype was CIP-levofloxacin (7.23%, 6/83). Carbapenem-resistant P. aeruginosa (CR-PA) isolates displayed 12 patterns, and the predominant multidrug resistance phenotype was IPM-MEM (23.33%, 7/30). Class 1 integrons were detected in 14 (12.4%, 14/113) isolates, 7.22% (6/83) in CS-PA isolates, and 26.67% (8/30) in CR-PA isolates. Six gene cassette arrays were detected, the most prevalent being aacA4-blaOXA101-aadA5 in five isolates (4.4%, 5/113). Seventeen gene cassettes were detected. The most prevalent antibiotic-resistance gene cassettes were aacA4 (6.2%, 7/113), blaOXA-1, and blaOXA-101. Extended-spectrum β-lactamase resistance genes were detected. Some of the genes carried were similar to those in other species, but some had shared characteristics among the P. aeruginosa isolates. Long-standing drug resistance genes appeared to be under elimination in P. aeruginosa, whereas integrons conferring resistance to commonly used clinical drugs such as β-lactamases, fluoroquinolones, and even carbapenems, as well as some other gene elements, were found to be newly integrated.
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Affiliation(s)
- Mi Liu
- Department of Clinical Laboratory, Weifang People's Hospital, Weifang, Shandong, China
| | - Jie Ma
- Department of Clinical Laboratory, Weifang People's Hospital, Weifang, Shandong, China
| | - Wei Jia
- Department of Clinical Laboratory, Weifang People's Hospital, Weifang, Shandong, China
| | - Wanxiang Li
- Department of Clinical Laboratory, Weifang People's Hospital, Weifang, Shandong, China
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11
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Li Y, Qiu Y, Ye C, Chen L, Liang Y, Liu G, Liu J. High-flux simultaneous screening of common foodborne pathogens and their virulent factors. Bioprocess Biosyst Eng 2020; 43:693-700. [PMID: 31863186 DOI: 10.1007/s00449-019-02267-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 10/30/2019] [Indexed: 02/05/2023]
Abstract
Rapid and sensitive detection techniques for foodborne pathogens are important to the food industry. However, traditional detection methods rely on bacterial culture in combination with biochemical tests, a process that typically takes 4-7 days to complete. In this study, we described a high-flux polymerase chain reaction (PCR) method for simultaneous detection of nine targeted genes (rfbE, stx1, stx2, invA, oprI, tlh, trh, tdh, and hlyA) with multiplex strains. The designed primers were highly specific for their respective target gene fragments. As the selected primers follow the principles of similar melting and annealing temperature, all the targeted genes could be detected for one strain with the same PCR program. Combining with 96-well PCR plate, by adding a single different gene to each well in each row, both the ATCC strains (E. coli, Salmonella spp., V. parahaemolyticus, L. monocytogenes, P. aeruginosa, S. aureus) and the clinical strains (E. coli, P. aeruginosa, S. aureus) were simultaneously detected to carry their specific and virulence genes. Therefore, using 96-well PCR plate for PCR amplification might be applied to high-flux sequencing of specific and virulence genes.
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Affiliation(s)
- Yanmei Li
- Department of Haematology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, 510623, China
| | - Yisen Qiu
- Department of Spine Surgery, The Second Affiliated Hospital of Shantou University Medical College, North Dongxia Road, Shantou, 515041, Guangdong, China
| | - Congxiu Ye
- Department of Dermato-Venereology, Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510640, China
| | - Ling Chen
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, 510640, China
| | - Yi Liang
- Guangdong Zhongqing Font Biochemical Science and Technology Co. Ltd, Maoming, 525427, Guangdong, China
| | - Guoxing Liu
- Guangzhou KEO Biotechnology Co. LTD, Guangzhou, Guangdong, China.
| | - Junyan Liu
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, 510640, China.
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12
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Zheng Y, Yu J, Liang C, Li S, Wen X, Li Y. Characterization on gut microbiome of PCOS rats and its further design by shifts in high-fat diet and dihydrotestosterone induction in PCOS rats. Bioprocess Biosyst Eng 2020; 44:953-964. [PMID: 32157446 DOI: 10.1007/s00449-020-02320-w] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 02/26/2020] [Indexed: 12/11/2022]
Abstract
Polycystic ovary syndrome (PCOS) is associated with gut microbiota disturbance. Emerging evidence has shown that gut microbiota plays a major role in the development of PCOS. To better understand how the gut microbiota contributes to the development of PCOS, we investigated the influences of high-fat diet and hyperandrogenism, independently or synergistically, have on the gut microbiota in rats. Furthermore, we explored the associations between gut microbiota and hyperandrogenism or other hallmarks of PCOS. Twenty female SD rats were randomized at aged 3 weeks into 4 groups (n = 5, each); HA: PCOS rats fed with ordinary diet; HF: rats with high-fat diet (HFD); HA-HF: PCOS rats fed with HFD; and C: control rats with ordinary diet. PCOS rat model was induced by 5α-dihydrotestosterone (DHT) injection for 6 weeks. The fasting blood glucose (FBG), plasma insulin, testosterone, free testosterone, TNF-α, MDA, SOD, LPS, TLR4, TG, TC, HDL-C, and LDL-C levels were measured. The molecular ecology of the fecal gut microbiota was analyzed by 16S rDNA high-throughput sequencing. The results showed that rats in the HA and HA-HF group displayed abnormal estrous cycles with increasing androgen level and exhibited multiple large cysts with diminished granulosa layers in ovarian tissues. Compare with the C group, relative abundance of the Bacteroidetes phylum decreased significantly in the other groups (P < 0.05). The Chao1 was the highest in the group C and significantly higher than the HA-HF group (P < 0.05). T, FT, insulin, MDA, LPS, and TNF-α levels had the negative correlation with the richness of community (Chao1 index) in the gut. The rats in the HF and HA-HF groups tended to have lower Shannon and Simpson indices than the C group (P < 0.01, respectively). However, there were no significant differences between C group and the HA group in the Shannon and Simpson values. Beta diversity analysis was then performed based on a weighted UniFrac analysis. The PCoA plots showed a clear separation of the C group from the other groups. ANOSIM analysis of variance confirmed that there were statistically significant separations between the C group and the HA, HA-HF, and HF groups (P < 0.01, respectively). These results showed that DHT with HFD could lower diversity of the gut microbial community. Both HFD and DHT could shift the overall gut microbial composition and change the composition of the microbial community in gut. Furthermore, our analyses demonstrated that the levels of TG, MDA, TNF-α, LPS, TLR4, T, FT, FINS, and HDL-C were correlated with the changes of in the gut microbiome. HFD and DHT were associated with the development and pathology of PCOS by shaping gut microbial communities.
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Affiliation(s)
- Yanhua Zheng
- Department of Traditional Chinese Medicine, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Jingwei Yu
- Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Chengjie Liang
- Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Shuna Li
- The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Xiaohui Wen
- The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Yanmei Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, China.
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13
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Zhou W, Wang K, Hong W, Bai C, Chen L, Fu X, Huang T, Liu J. Development and Application of a Simple "Easy To Operate" Propidium Monoazide-Crossing Priming Amplification on Detection of Viable and Viable But Non-culturable Cells of O157 Escherichia coli. Front Microbiol 2020; 11:569105. [PMID: 33101241 PMCID: PMC7546352 DOI: 10.3389/fmicb.2020.569105] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 08/24/2020] [Indexed: 02/05/2023] Open
Abstract
O157 Escherichia coli is one of the most important foodborne pathogens causing disease even at low cellular numbers. Thus, the early and accurate detection of this pathogen is important. However, due to the formation of viable but non-culturable (VBNC) status, the golden standard culturing methodology fails to identify O157 E. coli once it enters VBNC status. Crossing priming amplification (CPA) is a novel, simple, easy-to-operate detection technology that amplifies DNA with high speed, efficiency, and specificity under isothermal conditions. The objective of this study was to firstly develop and apply a CPA assay with propidium monoazide (PMA) for the rapid detection of the foodborne E. coli O157:H7 in VBNC state. Five primers (2a/1s, 2a, 3a, 4s, and 5a) were specially designed for recognizing three targets, which were rfbE, stx1, and stx2, and evaluated for its effectiveness in detecting VBNC cell of E. coli O157:H7 with detection limits of pure VBNC culture at 103, 105, and 105 colony-forming units (CFUs)/ml for rfbE, stx1, and stx2, respectively, whereas those of food samples (frozen pastry and steamed bread) were 103, 105, and 105 CFUs/ml. The application of the PMA-CPA assay was successfully used on detecting E. coli O157:H7 in VBNC state from food samples. In conclusion, this is the first development of PMA-CPA assay on the detection of VBNC cell, which was found to be useful and a powerful tool for the rapid detection of E. coli O157:H7 in VBNC state. Undoubtedly, the PMA-CPA method can be of high value to the food industry owing to its various advantages such as speed, specificity, sensitivity, and cost-effectiveness.
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Affiliation(s)
- Wenqu Zhou
- GMU-GIBH Joint School of Life Sciences, Guangzhou Medical University, Guangzhou, China
| | - Kan Wang
- Research Center for Translational Medicine, The Second Affiliated Hospital, Shantou University Medical College, Shantou, China
| | - Wei Hong
- GMU-GIBH Joint School of Life Sciences, Guangzhou Medical University, Guangzhou, China
| | - Caiying Bai
- Guangdong Women and Children Hospital, Guangzhou, China
| | - Ling Chen
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, China
- Research Institute for Food Nutrition and Human Health, Guangzhou, China
| | - Xin Fu
- GMU-GIBH Joint School of Life Sciences, Guangzhou Medical University, Guangzhou, China
- *Correspondence: Xin Fu,
| | - Tengyi Huang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Junyan Liu
- Department of Civil and Environmental Engineering, University of Maryland, College Park, MD, United States
- Junyan Liu,
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14
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Ou A, Wang K, Mao Y, Yuan L, Ye Y, Chen L, Zou Y, Huang T. First Report on the Rapid Detection and Identification of Methicillin-Resistant Staphylococcus aureus (MRSA) in Viable but Non-culturable (VBNC) Under Food Storage Conditions. Front Microbiol 2020; 11:615875. [PMID: 33488559 PMCID: PMC7817642 DOI: 10.3389/fmicb.2020.615875] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Accepted: 11/23/2020] [Indexed: 02/05/2023] Open
Abstract
Formation of viable but non-culturable (VBNC) status in methicillin-resistant Staphylococcus aureus (MRSA) has never been reported, and it poses a significant concern for food safety. Thus, this study aimed to firstly develop a rapid, cost-effective, and efficient testing method to detect and differentiate MRSA strains in the VBNC state and further apply this in real food samples. Two targets were selected for detection of MRSA and toxin, and rapid isothermal amplification detection assays were developed based on cross-priming amplification methodology. VBNC formation was performed for MRSA strain in both pure culture and in artificially contaminated samples, then propidium monoazide (PMA) treatment was further conducted. Development, optimization, and evaluation of PMA-crossing priming amplification (CPA) were further performed on detection of MRSA in the VBNC state. Finally, application of PMA-CPA was further applied for detection on MRSA in the VBNC state in contaminated food samples. As concluded in this study, formation of the VBNC state in MRSA strains has been verified, then two PMA-CPA assays have been developed and applied to detect MRSA in the VBNC state from pure culture and food samples.
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Affiliation(s)
- Aifen Ou
- Department of Food, Guangzhou City Polytechnic, Guangzhou, China
| | - Kan Wang
- Center for Translational Medicine, The Second Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Yanxiong Mao
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
| | - Lei Yuan
- College of Food Science and Engineering, Yangzhou University, Yangzhou, China
| | - Yanrui Ye
- School of Biological Science and Engineering, South China University of Technology, Guangzhou, China
| | - Ling Chen
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, China
| | - Yimin Zou
- Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, China
- *Correspondence: Yimin Zou,
| | - Tengyi Huang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Shantou University Medical College, Shantou, China
- Tengyi Huang,
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15
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Novovic KD, Malesevic MJ, Filipic BV, Mirkovic NL, Miljkovic MS, Kojic MO, Jovčić BU. PsrA Regulator Connects Cell Physiology and Class 1 Integron Integrase Gene Expression Through the Regulation of lexA Gene Expression in Pseudomonas spp. Curr Microbiol 2019; 76:320-328. [DOI: 10.1007/s00284-019-01626-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 01/10/2019] [Indexed: 12/30/2022]
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16
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Liu J, Xu R, Zhong H, Zhong Y, Xie Y, Li L, Li B, Chen D, Xu Z. RETRACTED: Prevalence of GBS serotype III and identification of a ST 17-like genotype from neonates with invasive diseases in Guangzhou, China. Microb Pathog 2018; 120:213-218. [DOI: 10.1016/j.micpath.2018.05.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 03/27/2018] [Accepted: 05/02/2018] [Indexed: 10/25/2022]
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17
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Liu J, Li L, Zhou L, Li B, Xu Z. Effect of ultrasonic field on the enzyme activities and ion balance of potential pathogen Saccharomyces cerevisiae. Microb Pathog 2018; 119:216-220. [DOI: 10.1016/j.micpath.2018.04.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 04/11/2018] [Accepted: 04/14/2018] [Indexed: 10/17/2022]
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18
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High flux isothermal assays on the pathogenic features of Mycoplasma pneumoniae. Microb Pathog 2018; 120:219-222. [PMID: 29730516 DOI: 10.1016/j.micpath.2018.05.004] [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: 04/05/2018] [Revised: 04/10/2018] [Accepted: 05/02/2018] [Indexed: 11/20/2022]
Abstract
As one of the most important pathogens, M. pneumoniae is a causative agent responsible for atypical and other respiratory tract infections, even its extra-pulmonary complications. This study aims to use the high and rapid flux sequencing assays on the M. pneumoniae and further bioinformatic analysis, for the investigation of their clinical features and pathogenic characteristics. The results in this study on the clinical features and pathogenic characteristics of M. pneumoniae may further aid in the control and surveillance and better understanding of this pathogen.
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Wen S, Feng D, Lu Z, Liu J, Peters BM, Tang H, Su D, Lin YP, Yang L, Xu Z, Shirtliff ME, Chen D. Microbial infection pattern, pathogenic features and resistance mechanism of carbapenem-resistant Gram negative bacilli during long-term hospitalization. Microb Pathog 2018; 117:356-360. [PMID: 29452198 DOI: 10.1016/j.micpath.2018.02.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 01/28/2018] [Accepted: 02/12/2018] [Indexed: 01/07/2023]
Abstract
BACKGROUND Carbapenem-resistant Gram-negative bacilli (GNB) have become an important cause of nosocomial infections of hospitalized patients. METHODS To investigate the microbial infection patterns and molecular epidemiology characteristics of the carbapenem-resistant GNB isolates from a long-term hospitalized patient, antimicrobial susceptibility testing, phenotypic screening test for carbapenemase production, PCR screening and DNA sequencing of carbapenemase genes, repetitive extragenic palindromic sequence-based PCR (REP-PCR), multilocus sequencing typing (MLST) and genetic environment analysis were performed. RESULTS Twelve strains with carbapenemase genes were detected from 63 carbapenem-resistant isolates, including two blaIMP-25-carrying Pseudomonas aeruginosa, one blaNDM-1-carrying Citrobacter freundii, three blaNDM-1-carrying Klebsiella pneumoniae and six blaKPC-2-carrying K. pneumoniae. Only the blaNDM-1 genes were successfully transferred from three K. pneumoniae strains to Escherichia coli C600 by conjugation. Genetic environment of blaIMP-25, blaNDM-1 and blaKPC-2 genes in our study were consistent with previous reports. Molecular typing of K. pneumoniae performed by MLST revealed that most of the isolates belonged to ST11. blaNDM-1-carrying K. pneumoniae sequencing type 1416 was first reported in our study. CONCLUSIONS Carbapenem-resistant GNB are common pathogens during long-term hospitalization, and ST11 blaKPC-2-carrying K. pneumoniae is the dominant bacterium in our study. Colonization and horizontal transmission of resistance by plasmids of carbapenem-resistant GNB have increased the risks of persistent infection and mortality of long-term hospitalized patients.
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Affiliation(s)
- Shuxian Wen
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Donghua Feng
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Zerong Lu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Junyan Liu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Brian M Peters
- Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Hailing Tang
- Centre for Translational Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Danhong Su
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Yong-Ping Lin
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China; Centre for Translational Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Ling Yang
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Zhenbo Xu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, China; Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, MD 21201, USA.
| | - Mark E Shirtliff
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, MD 21201, USA
| | - Dingqiang Chen
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China; Centre for Translational Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China.
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20
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Liu L, Lu Z, Li L, Li B, Zhang X, Zhang X, Xu Z. Physical relation and mechanism of ultrasonic bactericidal activity on pathogenic E. coli with WPI. Microb Pathog 2018; 117:73-79. [PMID: 29428425 DOI: 10.1016/j.micpath.2018.02.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 01/27/2018] [Accepted: 02/06/2018] [Indexed: 01/22/2023]
Abstract
OBJECTIVE This study aimed to investigate the physical relation and mechanism of bactericidal activity on pathogenic E. coli by ultrasonic field with whey protein isolate (WPI). METHODS Ultrasound treatment was performed under the conditions of intensity at 65 W/cm2, pulse duty ratio at 0.5 for 0-15 min with WPI concentration ranged from 0 to 10%. Viscosity, granularity, surface hydrophobicity, free radical scavenging activity, and thermal denaturation were assessed by rotational viscometer, Malvern Mastersizer 2000 particle size analyzer, fluorescent probe ANS method, DPPH method, and differential scanning calorimetry, respectively. RESULTS The thermal denaturation of WPI was not altered by ultrasound field, but the viscosity of WPI was increased upon 10 min treatment. Additionally, its ability to scavenge free radicals and hydrophobicity were increased. The result also showed that the bacteria viability was improved by WPI during ultrasound treatment. However, the WPI protection was decreased by the prolonged treatment. CONCLUSION Ultrasound treatment resulted in the increasing of the viscosity, free radicals scavenging activity and hydrophobicity of WPI which led to reduced bactericidal activity on E. coil, while WPI protection was disintegrated by prolonged treatment.
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Affiliation(s)
- Liyan Liu
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou, 510640, PR China
| | - Zerong Lu
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China
| | - Lin Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou, 510640, PR China
| | - Bing Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou, 510640, PR China
| | - Xia Zhang
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou, 510640, PR China
| | - Ximei Zhang
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China.
| | - Zhenbo Xu
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou, 510640, PR China; Department of Microbial Pathogenesis, University of Maryland, Baltimore, 21201, USA.
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21
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Li Y, Bai C, Yang L, Fu J, Yan M, Chen D, Zhang L. High flux isothermal assays on pathogenic, virulent and toxic genetics from various pathogens. Microb Pathog 2018; 116:68-72. [PMID: 29325863 DOI: 10.1016/j.micpath.2018.01.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Revised: 01/02/2018] [Accepted: 01/07/2018] [Indexed: 11/17/2022]
Abstract
Toxins, encoding by virulence factors, are significant cause of food-borne illnesses and death in the worldwide. Loop-mediated isothermal amplification (LAMP) is one of the widely used methodologies because of the high sensitivity, specificity and rapidity. Nowadays, LAMP has been regarded as an innovative gene amplification technology and emerged as an alternative to PCR-based methodologies in identification of the pathogenic virulent and toxic genetics. The high sensitivity of LAMP enables detection of the pathogens in sample materials even without time consuming and sample preparation. Therefore, we review the typical characteristics of LAMP assay, recent advance in detection of virulence factors and the application of LAMP assay on detection of four commonly virulence factors. As concluded, with the advantages of rapidity, simplicity, sensitivity, specificity and robustness, LAMP is capable of identification the virulence factors. Moreover, the main purpose of this review is to provide theory support for the application of LAMP assay on the virulence factors identification.
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Affiliation(s)
- Yanmei Li
- Department of Haematology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, China
| | - Caiying Bai
- Guangdong Women and Children Hospital, Guagzhou 510010, China
| | - Ling Yang
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Jie Fu
- Department of Haematology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, China
| | - Muxia Yan
- Department of Haematology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, China
| | - Dingqiang Chen
- Department of Laboratory Medicine, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China.
| | - Li Zhang
- Department of Haematology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, China.
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Yin H, Dong J, Yu J, Li Y, Deng Y. A novel horA genetic mediated RCA detection of beer spoilage lactobacillus. Microb Pathog 2018; 114:311-314. [PMID: 29197525 DOI: 10.1016/j.micpath.2017.11.064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 11/28/2017] [Accepted: 11/28/2017] [Indexed: 10/18/2022]
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23
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Virulence and resistance on various pathogens mediated by mobile genetic integrons via high flux assays. Microb Pathog 2018; 114:75-79. [DOI: 10.1016/j.micpath.2017.11.050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2017] [Revised: 11/24/2017] [Accepted: 11/24/2017] [Indexed: 02/08/2023]
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24
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Correlation and in vitro mechanism of bactericidal activity on E. coli with whey protein isolate during ultrasonic treatment. Microb Pathog 2017; 115:154-158. [PMID: 29278782 DOI: 10.1016/j.micpath.2017.12.062] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 12/20/2017] [Accepted: 12/20/2017] [Indexed: 12/12/2022]
Abstract
OBJECTIVE This study aimed to investigate correlation and in vitro mechanism of bactericidal activity on E. coli with whey protein isolate (WPI) during ultrasonic treatment. METHODS The structural changes of WPI under ultrasonic field were studied by amino-acid analyzer, circular dichroism, SDS-PAGE, and spectrophotometer. RESULTS With the increasing of WPI concentration added during ultrasonic treatment, the survival rate of E. coli increased. The influence of WPI on bactericidal activity under ultrasonic treatment might due to the change of tertiary and higher level structures, not by the primary structure, and had little relation with secondary structure. CONCLUSION The influence of WPI on bactericidal activity during ultrasonic treatment might due to the change of the tertiary structure and higher level structures.
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25
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Chen DQ, Jiang YT, Feng DH, Wen SX, Su DH, Yang L. Integron mediated bacterial resistance and virulence on clinical pathogens. Microb Pathog 2017; 114:453-457. [PMID: 29241766 DOI: 10.1016/j.micpath.2017.12.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 12/09/2017] [Accepted: 12/09/2017] [Indexed: 02/07/2023]
Abstract
Integron was recognized as mobile elements responsible for the emergence and diffusion of antibiotic resistance, virulence and pathogenicity. The existence of resistant integron in pathogens may consequently lead to the increasing number of clinical failures in bacterial mediated diseases, as well as the expenses. In this study, a total of 22 clinical pathogens (including E. faecalis, S. aureus, K. pneumoniae, Enterobacter, P. aeruginosa and Acinetobacter) were subjected to the identification of class 1-class 3 integrons and drug resistant gene cassettes by high flux LAMP method. According to the results, the clinical isolates were screened as carrying class 1 integron with dfrA12-orfF-aadA2 cassette array, class 1 integron with dfrA17-aadA5 cassette array, class 1 integron with aadA2 cassette, class 1 integron with blaVIM2 cassette, class 1 and class 2 integron with dfrA1-sat1-aadA1 and dfrA12-orfF-aadA2 cassette arrays simultaneously, which was accordantly with the previous data. The optimized high flux LAMP assay was proceeded in water bath at 65 °C for 60 min and determined by naked eye, with the time consumption restricted within 2.5 h. Prior to conventional PCR method, the high flux LAMP assay was demonstrated as a highly-specific and highly-sensitive method. This study offered a valid LAMP method in resistance integrons detection for laboratory use, which was time-saving and easy-determination.
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Affiliation(s)
- Ding-Qiang Chen
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China; Centre for Translational Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Yue-Ting Jiang
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Dong-Hua Feng
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China; Centre for Translational Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Shu-Xian Wen
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China; Centre for Translational Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Dan-Hong Su
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China
| | - Ling Yang
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China; Centre for Translational Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, China.
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26
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Li Y, Yang L, Fu J, Yan M, Chen D, Zhang L. The novel loop-mediated isothermal amplification based confirmation methodology on the bacteria in Viable but Non-Culturable (VBNC) state. Microb Pathog 2017; 111:280-284. [DOI: 10.1016/j.micpath.2017.09.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 09/03/2017] [Accepted: 09/05/2017] [Indexed: 01/28/2023]
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27
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Zhong H, Zhong Y, Deng Q, Zhou Z, Guan X, Yan M, Hu T, Luo M. Virulence of thermolable haemolysi tlh, gastroenteritis related pathogenicity tdh and trh of the pathogens Vibrio Parahemolyticus in Viable but Non-Culturable (VBNC) state. Microb Pathog 2017; 111:352-356. [DOI: 10.1016/j.micpath.2017.09.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 09/05/2017] [Accepted: 09/11/2017] [Indexed: 10/18/2022]
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Lin Q, Xu P, Li J, Huang J, Chen Y, Deng S. Study on the excision and integration mediated by class 1 integron in Streptococcus pneumoniae. Microb Pathog 2017; 111:446-449. [PMID: 28923604 DOI: 10.1016/j.micpath.2017.09.031] [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] [Received: 09/07/2017] [Revised: 09/13/2017] [Accepted: 09/14/2017] [Indexed: 11/15/2022]
Abstract
As a novel antibiotic resistance mobile element, integron was recognized as a primary source of antibiotic genes among Gram-positive organisms for its excision and integration of exogenous genes. In this study, Streptococcus pneumoniae was subjected to investigate the excision and integration of class 1 integron with eight different plasmids. As the results indicated, excision in both att site and gene cassettes were successfully observed, which was further confirmed by integration assays and PCR amplification. The observation of class 1 integron mediated excision and integration of various exogenous antibiotics resistance genes may raise the attention of integrons as novel antibiotic resistance determinant in Gram-positive bacteria, especially in Streptococcus.
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Affiliation(s)
- Qun Lin
- Department of Respiratory, The Affiliated Shunde Hospital of Guangzhou Medical University, Foshan 528315, China
| | - Pusheng Xu
- Department of Respiratory, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou 510260, China.
| | - Jiaowu Li
- Department of Respiratory, The Affiliated Shunde Hospital of Guangzhou Medical University, Foshan 528315, China
| | - Jinhua Huang
- Department of Respiratory, The Affiliated Shunde Hospital of Guangzhou Medical University, Foshan 528315, China
| | - Yin Chen
- Department of Respiratory, The Affiliated Shunde Hospital of Guangzhou Medical University, Foshan 528315, China
| | - Shuhuan Deng
- Department of Respiratory, The Affiliated Shunde Hospital of Guangzhou Medical University, Foshan 528315, China
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Microbial pathogenicity and virulence mediated by integrons on Gram-positive microorganisms. Microb Pathog 2017; 111:481-486. [PMID: 28923605 DOI: 10.1016/j.micpath.2017.09.035] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Revised: 09/13/2017] [Accepted: 09/14/2017] [Indexed: 11/22/2022]
Abstract
Gram-positive microorganisms are one of leading pathogenic microorganisms in public health, including several typical "Super Bugs" as methicillin-resistant Staphylococcus aureus, Klebsiella pneumoniae carbapenemase and vancomycin-resistant enterococci, which caused a increasement of infections, clinical failures and expenses. Regarded as a common genetic element responsible for horizontal gene transfer, integrons are widely distributed in various pathogens considered as a determinant in the acquisition and evolution of antibiotic resistance. Current investigations mainly focus on the distribution of integrons in Gram-negative microorganisms, while the role of integron in antibiotic resistance among Gram-positive microorganisms remains unclear and need investigation. To date, the surveillances of integrons in Gram-positive microorganism have been widely conducted in clinic, community even husbandry. China remains one of the worst country in antibiotics abuse worldwide and considered as a potential area for the prevalence of antimicrobial microorganisms and the occurrence of various 'Super Bugs'. Recently, the surveillance of the occurrence of integron and resistance gene cassettes was conducted in South China during the first 10 years of the 21st century. Referred to the surveillance in South China and other investigation in Asian countries, this review aims to summarize the occurrence, pathogenicity and virulence mediated by integrons in typical Gram-positive microorganisms (Staphylococcus, Enterococcus, Corynebacterium and Streptococcus) and the role of integrons in antibiotic resistance.
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Liu J, Yang L, Chen D, Peters BM, Li L, Li B, Xu Z, Shirtliff ME. Complete sequence of pBM413, a novel multidrug resistance megaplasmid carrying qnrVC6 and bla IMP-45 from pseudomonas aeruginosa. Int J Antimicrob Agents 2017; 51:145-150. [PMID: 28923459 DOI: 10.1016/j.ijantimicag.2017.09.008] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 09/01/2017] [Accepted: 09/10/2017] [Indexed: 11/27/2022]
Abstract
This study aimed to characterise a novel multidrug resistance megaplasmid carrying qnrVC6 and blaIMP-45 from Pseudomonas aeruginosa strain Guangzhou-Pae617 isolated from a patient hospitalised in Guangzhou, China, in 2012. The plasmid pBM413 has a length of 423 017 bp and an average G + C content of 56.41%. A qnrVC6 gene flanked by two copies of insertion sequence (IS) elements ISCR1, a multiresistance class 1 integron In786 containing aacA4-blaIMP-45-blaOXA-1-catB3 cassettes, an armA gene, and an aphA7 gene flanked by two copies of IS26 were identified. To our knowledge, this is the first identification of a qnrVC6 gene in P. aeruginosa.
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Affiliation(s)
- Junyan Liu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Ling Yang
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, China
| | - Dingqiang Chen
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, China.
| | - Brian M Peters
- Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Sciences Center, Memphis, TN 38163, USA
| | - Lin Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Bing Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Zhenbo Xu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, China; Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, MD 21201, USA.
| | - Mark E Shirtliff
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, MD 21201, USA
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Liu J, Li L, Zhou L, Li B, Xu Z. Effect of ultrasound treatment conditions on Saccharomyces cerevisiae by response surface methodology. Microb Pathog 2017; 111:497-502. [PMID: 28919487 DOI: 10.1016/j.micpath.2017.09.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 09/11/2017] [Accepted: 09/11/2017] [Indexed: 10/18/2022]
Abstract
OBJECTIVES This study aimed to investigate the effect of different ultrasound treatment conditions on the inactivation of Saccharomyces cerevisiae with the application of response surface methodology (RSM). METHODS Ultrasound treatment were applied on different concentrations of S. cerevisiae cells with different pH, temperature, ultrasound power, irradiating time, and pulse duty ratio. Cell viability was determined by plate counting method. Response surface methodology was used to analyze the correlation among various factors. RESULTS Limited with low ultrasound power, lower pH value slightly improved the ultrasound treatment efficiency. Also, higher nonlethal temperature and ultrasound power, longer irradiation time, and lower pulse duty ratio facilitated the inactivation of S. cerevisiae. Cell concentration had no effect on ultrasound efficiency. CONCLUSIONS Ultrasound power played the most important role in the ultrasound irradiation process according to RSM analyses. Information derived from this study may aid in the control of the sublethal injury of S. cerevisiae during ultrasound treatment in food industry.
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Affiliation(s)
- Junyan Liu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Lin Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China
| | - Lizhen Zhou
- School of Applied Chemistry and Biological Technology, Shenzhen Polytechnic, Shenzhen 518055, PR China.
| | - Bing Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China
| | - Zhenbo Xu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China; Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, MD 21201, USA.
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32
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Study on the excision and integration mediated by class 1 integron in Enterococcus faecalis. Microb Pathog 2017; 110:678-681. [DOI: 10.1016/j.micpath.2017.04.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 04/01/2017] [Accepted: 04/04/2017] [Indexed: 02/04/2023]
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Xu Z, Xu X, Qi D, Yang L, Li B, Li L, Li X, Chen D. Effect of aminoglycosides on the pathogenic characteristics of microbiology. Microb Pathog 2017; 113:357-364. [PMID: 28867624 DOI: 10.1016/j.micpath.2017.08.053] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 08/30/2017] [Accepted: 08/30/2017] [Indexed: 02/08/2023]
Abstract
Infections caused by pathogen remain to be one of the most important global health issues, and scientists are devoting themselves to seeking effective treatments. Aminoglycoside antibiotics are one kind of widely used antibiotics because of the good efficiency and broad antimicrobial-spectrum. However, it causes some unexpected effects on the pathogenic characteristics of microbiology during the treatment, such as drug resistance and biofilm promotion. Drug resistance is partly due to antibiotics abuse. Simultaneously, aminoglycoside is documented to make divergent effects on biofilm based on their concentrations. Here, we review the mechanism of drug resistance caused by long-term use of aminoglycoside antibiotics, the effects of antibiotic concentration on biofilm formation and the negative effects on intestinal flora to provide theoretical supports for rational use of antibiotics.
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Affiliation(s)
- Zhenbo Xu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou, PR China; Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, MD 21201, USA.
| | - Xingyong Xu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China
| | - Da Qi
- BGI-Shenzhen, Shenzhen 518083, PR China
| | - Ling Yang
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, PR China
| | - Bing Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou, PR China
| | - Lin Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou, PR China
| | - Xiaoxi Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou, PR China.
| | - Dingqiang Chen
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou 510120, PR China
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Xie J, Yang L, Peters BM, Chen L, Chen D, Li B, Li L, Yu G, Xu Z, Shirtliff ME. A 16-year retrospective surveillance report on the pathogenic features and antimicrobial susceptibility of Pseudomonas aeruginosa isolates from FAHJU in Guangzhou representative of Southern China. Microb Pathog 2017. [DOI: 10.1016/j.micpath.2017.06.018] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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35
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Lin S, Yang L, Chen G, Li B, Chen D, Li L, Xu Z. Pathogenic features and characteristics of food borne pathogens biofilm: Biomass, viability and matrix. Microb Pathog 2017; 111:285-291. [PMID: 28803003 DOI: 10.1016/j.micpath.2017.08.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 08/06/2017] [Accepted: 08/07/2017] [Indexed: 11/16/2022]
Abstract
Biofilm is a ubiquitous growth pattern of bacterial species survival but is notorious for its threat on public health and food contamination. Extensive studies of the biofilm structure, formation, quantification, quorum sensing system and underlying control strategies have been reported during the past decades. Insightful elucidation of the pathogenic features and characteristic of bacterial biofilm can facilitate in devising appropriate control strategies for biofilm eradication. Therefore, this review mainly summarized the pathogenic features of biofilms from food borne microorganisms, including the biomass (which could be quantified using crystal violet and fluorogenic dye Syto9 assays), viability (which could be determined by tetrazolium salts, fluorescein diacetate, resazurin staining and alamar blue assays) and matrix (which are commonly detected by dimethyl methylene blue and wheat germ agglutinin assays). In addition, three features were further compared with its particular benefits in specific application.
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Affiliation(s)
- Shiqi Lin
- College of Food Sciences and Technology, South China University of Technology, Guangzhou 510640, China.
| | - Ling Yang
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, China.
| | - Gu Chen
- College of Food Sciences and Technology, South China University of Technology, Guangzhou 510640, China.
| | - Bing Li
- College of Food Sciences and Technology, South China University of Technology, Guangzhou 510640, China.
| | - Dingqiang Chen
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, China.
| | - Lin Li
- College of Food Sciences and Technology, South China University of Technology, Guangzhou 510640, China.
| | - Zhenbo Xu
- College of Food Sciences and Technology, South China University of Technology, Guangzhou 510640, China; Department of Microbial Pathogenesis, University of Maryland, Baltimore MD 21201, United States.
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36
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Bao X, Yang L, Chen L, Li B, Li L, Li Y, Xu Z. Analysis on pathogenic and virulent characteristics of the Cronobacter sakazakii strain BAA-894 by whole genome sequencing and its demonstration in basic biology science. Microb Pathog 2017; 109:280-286. [DOI: 10.1016/j.micpath.2017.05.030] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 05/13/2017] [Accepted: 05/19/2017] [Indexed: 11/29/2022]
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37
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Liu J, Li L, Li B, Peters BM, Deng Y, Xu Z, Shirtliff ME. Study on spoilage capability and VBNC state formation and recovery of Lactobacillus plantarum. Microb Pathog 2017; 110:257-261. [PMID: 28668605 DOI: 10.1016/j.micpath.2017.06.044] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 06/27/2017] [Accepted: 06/28/2017] [Indexed: 10/19/2022]
Abstract
OBJECTIVE The present study aimed at investigating the capability of L. plantarum strain BM-LP14723 to enter into and recover from the viable but nonculturable (VBNC) state and to cause beer spoilage. METHODS VBNC state was induced by incubating in beer with subculturing or low temperature treatment. Culturable, total, and viable cells numbers were assessed by MRS agar plate counting, acridine orange direct counting, and Live/Dead BacLight bacterial viability kit, respectively. Organic acids concentrations were measured by reversed-phase high performance liquid chromatography. RESULTS VBNC L. plantarum cells were detected after 189 ± 1.9 days low temperature treatment or 29 ± 0.7 subcultures in beer. The VBNC L. plantarum retained spoilage capability. Addition of catalase is an effective method for the recovery of the VBNC L. plantarum cells. CONCLUSION L. plantarum strain BM-LP14723 is capable of entering into and recovery from the VBNC state and maintained spoilage capability. The current study presented that beer-spoilage L. plantarum can hide both in breweries and during transporting and marketing process and thus lead to beer-spoilage incidents.
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Affiliation(s)
- Junyan Liu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Lin Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China
| | - Bing Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China
| | - Brian M Peters
- Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Yang Deng
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China.
| | - Zhenbo Xu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China; Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, MD 21201, USA.
| | - Mark E Shirtliff
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, MD 21201, USA
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38
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Miao J, Chen L, Wang J, Wang W, Chen D, Li L, Li B, Deng Y, Xu Z. Evaluation and application of molecular genotyping on nosocomial pathogen-methicillin-resistant Staphylococcus aureus isolates in Guangzhou representative of Southern China. Microb Pathog 2017; 107:397-403. [DOI: 10.1016/j.micpath.2017.04.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 04/11/2017] [Accepted: 04/12/2017] [Indexed: 11/16/2022]
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39
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Xie J, Peters BM, Li B, Li L, Yu G, Xu Z, Shirtliff ME. Clinical features and antimicrobial resistance profiles of important Enterobacteriaceae pathogens in Guangzhou representative of Southern China, 2001–2015. Microb Pathog 2017; 107:206-211. [DOI: 10.1016/j.micpath.2017.03.038] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 03/19/2017] [Accepted: 03/21/2017] [Indexed: 11/27/2022]
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40
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Lin Q, Xu P, Li J, Chen Y, Feng J. Direct bacterial loop-mediated isothermal amplification detection on the pathogenic features of the nosocomial pathogen - Methicillin resistant Staphylococcus aureus strains with respiratory origins. Microb Pathog 2017; 109:183-188. [PMID: 28578093 DOI: 10.1016/j.micpath.2017.05.044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 05/24/2017] [Accepted: 05/30/2017] [Indexed: 01/25/2023]
Abstract
Loop-mediated isothermal amplification based detection assays using bacterial culture or colony for direct detection of methicillin resistant Staphylococcus aureus(MRSA) had been developed and evaluated, followed by its extensive application on a large scale of clinical MRSA isolated from respiratory origins, including nasal swabs and sputums. Six primers, including outer primers, inner primers and loop primers, were specifically designed for recognizing eight distinct sequences on four targets: 16SrRNA, femA, mecA and orfX. Twenty-seven reference strains were used to develop, evaluate and optimize this assay. Then, a total of 532 clinical MRSA isolates were employed for each detected targets. And the results were determined through both visual observation of the color change by naked eye and electrophoresis. The specific of each primer had been confirmed, and the optimal amplification was obtained under 65 °C for 40 min. The limit of detections (LOD) of bacteria culture LAMP assays were determined to be 104 CFU/ml for 16S rRNA, femA, as well as orfX and 105 CFU/ml for mecA, respectively. The established novel assays on MRSA detection may provide new strategies for rapid detection of foodborne pathogens.
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Affiliation(s)
- Qun Lin
- Lecong Hospital Affiliated of Guangzhou Medical University, Shunde District, Foshan 528315, Guangdong province, China
| | - Pusheng Xu
- Lecong Hospital Affiliated of Guangzhou Medical University, Shunde District, Foshan 528315, Guangdong province, China.
| | - Jiaowu Li
- Lecong Hospital Affiliated of Guangzhou Medical University, Shunde District, Foshan 528315, Guangdong province, China
| | - Yin Chen
- Lecong Hospital Affiliated of Guangzhou Medical University, Shunde District, Foshan 528315, Guangdong province, China
| | - Jieyi Feng
- Lecong Hospital Affiliated of Guangzhou Medical University, Shunde District, Foshan 528315, Guangdong province, China
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Liu J, Li L, Peters BM, Li B, Chen D, Xu Z, Shirtliff ME. Complete genome sequence and bioinformatics analyses of Bacillus thuringiensis strain BM-BT15426. Microb Pathog 2017; 108:55-60. [PMID: 28479507 DOI: 10.1016/j.micpath.2017.05.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 04/27/2017] [Accepted: 05/02/2017] [Indexed: 10/19/2022]
Abstract
OBJECTIVES This study aimed to investigate the genetic characteristics of Bacillus thuringiensis strain BM-BT15426. METHODS B. thuringiensis strain was identified by sequencing the PCR product (amplifying 16S rRNA gene) using ABI Prism 377 DNA Sequencer. The genome was sequenced using PacBio RS II sequencers and assembled de novo using HGAP. Also, further genome annotation was performed. RESULTS The genome of B. thuringiensis strain BM-BT15426 has a length of 5,246,329 bp and contains 5409 predicted genes with an average G + C content of 35.40%. Three genes were involved in the "Infectious diseases: Amoebiasis" pathway. A total of 21 virulence factors and 9 antibiotic resistant genes were identified. CONCLUSIONS The major pathogenic factors of B. thuringiensis strain BM-BT15426 were identified through complete genome sequencing and bioinformatics analyses which contributes to further study on pathogenic mechanism and phenotype of B. thuringiensis.
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Affiliation(s)
- Junyan Liu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Science Center, Memphis TN 38163, USA
| | - Lin Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China
| | - Brian M Peters
- Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Science Center, Memphis TN 38163, USA
| | - Bing Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China
| | - Dingqiang Chen
- Department of Laboratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, PR China.
| | - Zhenbo Xu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China; Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore MD 21201, USA.
| | - Mark E Shirtliff
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore MD 21201, USA
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Detection on integron carried gene cassettes from pathogens by loop mediated isothermal amplification assays. Microb Pathog 2017; 107:304-308. [PMID: 28392412 DOI: 10.1016/j.micpath.2017.04.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 04/04/2017] [Accepted: 04/04/2017] [Indexed: 11/23/2022]
Abstract
In this study, a number of frequently detected gene cassettes from bacterial integrons have been detected and characterized by rapid and simple loop-mediated isothermal amplification (LAMP) assays. Six gene cassettes commonly found in class 1 integrons were studied, including dfrA12, dfrA17, aadA2, aadA5, orfF, and blaVIM2. Primers design, sensitivity, specificity, optimization of each LAMP assay, as well as application of the developed 6 individual LAMP assays on a large scale of bacteria, had been conducted. The optimal amplification was obtained with temperature as 65 °C, reaction time span as 45 min and volume as 25 μl. For application, 272 isolates with various gene cassettes yielded expectable positive amplicons and other 685 integron-negative bacteria showed negative results for the LAMP assays, totaling 100% detection rate and specificity.
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Liu J, Li L, Li B, Peters BM, Deng Y, Xu Z, Shirtliff ME. First study on the formation and resuscitation of viable but nonculturable state and beer spoilage capability of Lactobacillus lindneri. Microb Pathog 2017; 107:219-224. [PMID: 28377233 DOI: 10.1016/j.micpath.2017.03.043] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 03/29/2017] [Accepted: 03/30/2017] [Indexed: 11/28/2022]
Abstract
OBJECTIVES This study aimed to investigate the spoilage capability of Lactobacillus lindneri during the induction and resuscitation of viable but nonculturable (VBNC) state. METHODS L. lindneri strain was identified by sequencing the PCR product (amplifying 16S rRNA gene) using ABI Prism 377 DNA Sequencer. During the VBNC state induction by low temperature storage and beer adaption, total, culturable, and viable cells were assessed by acridine orange direct counting, plate counting, and Live/Dead BacLight bacterial viability kit, respectively. Organic acids and diacetyl concentration were measured by reversed-phase high performance liquid chromatography and head dpace gas chromatography, respectively. RESULTS VBNC state of L. lindneri was successfully induced by both beer adaption and low temperature storage, and glycerol frozen stock was the optimal way to maintain the VBNC state. Addition of catalase was found to be an effective method for the resuscitation of VBNC L. lindneri cells. Furthermore, spoilage capability remained similar during the induction and resuscitation of VBNC L. lindneri. CONCLUSIONS This is the first report of induction by low temperature storage and resuscitation of VBNC L. lindneri strain, as well as the first identification of spoilage capability of VBNC and resuscitated L. lindneri cells. This study indicated that the potential colonization of L. lindneri strain in brewery environment, formation and resuscitation of VBNC state, as well as maintenance in beer spoilage capability, may be an important risk factor for brewery environment.
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Affiliation(s)
- Junyan Liu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Science Center, Memphis TN 38163, USA
| | - Lin Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China
| | - Bing Li
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China
| | - Brian M Peters
- Department of Clinical Pharmacy, College of Pharmacy, University of Tennessee Health Science Center, Memphis TN 38163, USA
| | - Yang Deng
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China.
| | - Zhenbo Xu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, PR China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, PR China; Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore MD 21201, USA.
| | - Mark E Shirtliff
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore MD 21201, USA
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Yan M, Xu L, Jiang H, Zhou Z, Zhou S, Zhang L. PMA-LAMP for rapid detection of Escherichia coli and shiga toxins from viable but non-culturable state. Microb Pathog 2017; 105:245-250. [PMID: 28167125 DOI: 10.1016/j.micpath.2017.02.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Revised: 01/26/2017] [Accepted: 02/01/2017] [Indexed: 12/11/2022]
Abstract
In exposure to outer pressure, microorganisms are capable of entry into the Viable But Non-Culturable (VBNC) state, and thus survive under various elimination processing. The survival microorganisms may yield negative results on culturing, and cause false negative for this golden standard methodology. In this study, a novel PMA-LAMP assay on the detection of Enterohemorrhage E. coli and shiga toxins has been developed and evaluated, with further application on a number of food borne E. coli strains. LAMP primers were designed on the target of rfbe for Enterohemorrhage E. coli and stx1with stx2 for shiga toxins. Via specific penetration through the damaged cell membrane of dead cells and intercalating into DNA, PMA could prevent DNA amplification of dead bacteria from LAMP, which enabled the differentiation of bacteria between VBNC state and dead state. The established PMA-LAMP showed significant advantage in rapidity, sensitivity and specificity, compared with regular PCR assay. The applicability had also been verified, demonstrating the PMA-LAMP was capable of detection on Enterohemorrhage E. coli and shiga toxins.
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Affiliation(s)
- Muxia Yan
- Department of Haematology, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou 510623, PR China.
| | - Ling Xu
- Department of Haematology, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou 510623, PR China.
| | - Hua Jiang
- Department of Haematology, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou 510623, PR China.
| | - Zhenwen Zhou
- Clinical Microbiogy, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou 510180, PR China.
| | - Shishui Zhou
- School of Bioscience and Bioengineering, South China University of Technology, 382 Zhonghuan Road East, Guangzhou 510006, PR China.
| | - Li Zhang
- Department of Haematology, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou 510623, PR China.
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Draft Genome Sequence of a Pseudomonas sp. Strain Carrying blaIMP-25 and blaVIM-2 Carbapenemase Genes from Hospital Sewage. GENOME ANNOUNCEMENTS 2016; 4:4/5/e01027-16. [PMID: 27795238 PMCID: PMC5073250 DOI: 10.1128/genomea.01027-16] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Pseudomonas strain WCHP16 recovered from hospital sewage in West China Hospital, Chengdu, China was found to carry two carbapenemase genes blaIMP-25 and blaVIM-2. Here, we report its 5.7-Mb draft genome sequence, comprising 141 contigs and an average 59.53% G+C content. The genome contained 5,504 coding sequences and 67 tRNA genes.
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