51
|
Poimenidou SV, Dalmasso M, Papadimitriou K, Fox EM, Skandamis PN, Jordan K. Virulence Gene Sequencing Highlights Similarities and Differences in Sequences in Listeria monocytogenes Serotype 1/2a and 4b Strains of Clinical and Food Origin From 3 Different Geographic Locations. Front Microbiol 2018; 9:1103. [PMID: 29922249 PMCID: PMC5996115 DOI: 10.3389/fmicb.2018.01103] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 05/08/2018] [Indexed: 11/13/2022] Open
Abstract
The prfA-virulence gene cluster (pVGC) is the main pathogenicity island in Listeria monocytogenes, comprising the prfA, plcA, hly, mpl, actA, and plcB genes. In this study, the pVGC of 36 L. monocytogenes isolates with respect to different serotypes (1/2a or 4b), geographical origin (Australia, Greece or Ireland) and isolation source (food-associated or clinical) was characterized. The most conserved genes were prfA and hly, with the lowest nucleotide diversity (π) among all genes (P < 0.05), and the lowest number of alleles, substitutions and non-synonymous substitutions for prfA. Conversely, the most diverse gene was actA, which presented the highest number of alleles (n = 20) and showed the highest nucleotide diversity. Grouping by serotype had a significantly lower π value (P < 0.0001) compared to isolation source or geographical origin, suggesting a distinct and well-defined unit compared to other groupings. Among all tested genes, only hly and mpl were those with lower nucleotide diversity in 1/2a serotype than 4b serotype, reflecting a high within-1/2a serotype divergence compared to 4b serotype. Geographical divergence was noted with respect to the hly gene, where serotype 4b Irish strains were distinct from Greek and Australian strains. Australian strains showed less diversity in plcB and mpl relative to Irish or Greek strains. Notable differences regarding sequence mutations were identified between food-associated and clinical isolates in prfA, actA, and plcB sequences. Overall, these results indicate that virulence genes follow different evolutionary pathways, which are affected by a strain's origin and serotype and may influence virulence and/or epidemiological dominance of certain subgroups.
Collapse
Affiliation(s)
- Sofia V. Poimenidou
- Laboratory of Food Quality Control and Hygiene, Department of Food Science and Human Nutrition, Agricultural University of Athens, Athens, Greece
| | - Marion Dalmasso
- Teagasc Food Research Centre, Moorepark, Fermoy, Co., Cork, Ireland
| | - Konstantinos Papadimitriou
- Laboratory of Dairy Research, Department of Food Science and Human Nutrition, Agricultural University of Athens, Athens, Greece
| | - Edward M. Fox
- CSIRO Agriculture and Food, Werribee, VIC, Australia
| | - Panagiotis N. Skandamis
- Laboratory of Food Quality Control and Hygiene, Department of Food Science and Human Nutrition, Agricultural University of Athens, Athens, Greece
| | - Kieran Jordan
- Teagasc Food Research Centre, Moorepark, Fermoy, Co., Cork, Ireland
| |
Collapse
|
52
|
Soni DK, Ahmad R, Dubey SK. Biosensor for the detection of Listeria monocytogenes: emerging trends. Crit Rev Microbiol 2018; 44:590-608. [PMID: 29790396 DOI: 10.1080/1040841x.2018.1473331] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
The early detection of Listeria monocytogenes (L. monocytogenes) and understanding the disease burden is of paramount interest. The failure to detect pathogenic bacteria in the food industry may have terrible consequences, and poses deleterious effects on human health. Therefore, integration of methods to detect and trace the route of pathogens along the entire food supply network might facilitate elucidation of the main contamination sources. Recent research interest has been oriented towards the development of rapid and affordable pathogen detection tools/techniques. An innovative and new approach like biosensors has been quite promising in revealing the foodborne pathogens. In spite of the existing knowledge, advanced research is still needed to substantiate the expeditious nature and sensitivity of biosensors for rapid and in situ analysis of foodborne pathogens. This review summarizes recent developments in optical, piezoelectric, cell-based, and electrochemical biosensors for Listeria sp. detection in clinical diagnostics, food analysis, and environmental monitoring, and also lists their drawbacks and advantages.
Collapse
Affiliation(s)
- Dharmendra Kumar Soni
- a Department of Botany, Institute of Science , Banaras Hindu University , Varanasi , India
| | - Rafiq Ahmad
- b Sensors Lab, Electrical Engineering Program, Computer, Electrical and Mathematical Science and Engineering Division , King Abdullah University of Science and Technology (KAUST) , Thuwal , Kingdom of Saudi Arabia
| | - Suresh Kumar Dubey
- a Department of Botany, Institute of Science , Banaras Hindu University , Varanasi , India
| |
Collapse
|
53
|
Whole genome sequencing as a typing tool for foodborne pathogens like Listeria monocytogenes – The way towards global harmonisation and data exchange. Trends Food Sci Technol 2018. [DOI: 10.1016/j.tifs.2018.01.008] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
54
|
Yuan W, Lee HW, Yuk HG. Antimicrobial efficacy of Cinnamomum javanicum plant extract against Listeria monocytogenes and its application potential with smoked salmon. Int J Food Microbiol 2017; 260:42-50. [DOI: 10.1016/j.ijfoodmicro.2017.08.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 08/13/2017] [Accepted: 08/18/2017] [Indexed: 12/14/2022]
|
55
|
Shen Y, Boulos S, Sumrall E, Gerber B, Julian-Rodero A, Eugster MR, Fieseler L, Nyström L, Ebert MO, Loessner MJ. Structural and functional diversity in Listeria cell wall teichoic acids. J Biol Chem 2017; 292:17832-17844. [PMID: 28912268 DOI: 10.1074/jbc.m117.813964] [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: 08/22/2017] [Indexed: 11/06/2022] Open
Abstract
Wall teichoic acids (WTAs) are the most abundant glycopolymers found on the cell wall of many Gram-positive bacteria, whose diverse surface structures play key roles in multiple biological processes. Despite recent technological advances in glycan analysis, structural elucidation of WTAs remains challenging due to their complex nature. Here, we employed a combination of ultra-performance liquid chromatography-coupled electrospray ionization tandem-MS/MS and NMR to determine the structural complexity of WTAs from Listeria species. We unveiled more than 10 different types of WTA polymers that vary in their linkage and repeating units. Disparity in GlcNAc to ribitol connectivity, as well as variable O-acetylation and glycosylation of GlcNAc contribute to the structural diversity of WTAs. Notably, SPR analysis indicated that constitution of WTA determines the recognition by bacteriophage endolysins. Collectively, these findings provide detailed insight into Listeria cell wall-associated carbohydrates, and will guide further studies on the structure-function relationship of WTAs.
Collapse
Affiliation(s)
- Yang Shen
- From the Laboratory of Food Microbiology, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, CH-8092 Zurich,
| | - Samy Boulos
- the Laboratory of Food Biochemistry, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 9, CH-8092 Zurich
| | - Eric Sumrall
- From the Laboratory of Food Microbiology, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, CH-8092 Zurich
| | - Benjamin Gerber
- From the Laboratory of Food Microbiology, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, CH-8092 Zurich
| | - Alicia Julian-Rodero
- From the Laboratory of Food Microbiology, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, CH-8092 Zurich
| | - Marcel R Eugster
- From the Laboratory of Food Microbiology, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, CH-8092 Zurich
| | - Lars Fieseler
- the ZHAW School of Life Sciences and Facility Management, Einsiedlerstrasse 31, CH-8820 Wädenswil, and
| | - Laura Nyström
- the Laboratory of Food Biochemistry, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 9, CH-8092 Zurich
| | - Marc-Olivier Ebert
- the Laboratory of Organic Chemistry, ETH Zurich, Vladmimir-Prelog-Weg 3, CH-8093 Zurich, Switzerland
| | - Martin J Loessner
- From the Laboratory of Food Microbiology, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, CH-8092 Zurich
| |
Collapse
|
56
|
Prevalence and methodologies for detection, characterization and subtyping of Listeria monocytogenes and L. ivanovii in foods and environmental sources. FOOD SCIENCE AND HUMAN WELLNESS 2017. [DOI: 10.1016/j.fshw.2017.06.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
57
|
|
58
|
Datta AR, Burall LS. Serotype to genotype: The changing landscape of listeriosis outbreak investigations. Food Microbiol 2017; 75:18-27. [PMID: 30056958 DOI: 10.1016/j.fm.2017.06.013] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 06/08/2017] [Accepted: 06/15/2017] [Indexed: 02/07/2023]
Abstract
The classical definition of a disease outbreak is the occurrence of cases of disease in excess of what would normally be expected in a community, geographical area or time period. The establishment of an outbreak then starts with the identification of an incidence of cases above the normally expected threshold during a given time period. Subsequently, the cases are examined using a variety of subtyping methods to identify potential linkages. As listeriosis disease has a long incubation period, relating a single source or multiple sources of contaminated food to clinical disease is challenging and time consuming. The vast majority of human listeriosis cases are caused by three serotypes, 1/2a, 1/2b, and 4b. Thus serotyping of isolates from suspected foods and clinical samples, although useful for eliminating some food sources, has a very limited discriminatory power. The advent of faster and more affordable sequencing technology, coupled with increased computational power, has permitted comparisons of whole Listeria genome sequences from isolates recovered from clinical, food, and environmental sources. These analyses made it possible to identify outbreaks and the source much more accurately and faster, thus leading to a reduction in number of illnesses as well as a reduction in economic losses. Initial DNA sequence information also facilitated the development of a simple molecular serotype protocol which allowed for the identification of major disease causing serotypes of L. monocytogenes, including a clade of 4b variant (4bV) strains of L. monocytogenes involved in at least 3 more recent listeriosis outbreaks in the US. Furthermore, data generated using whole genome sequence (WGS) analyses was successfully utilized to develop a pan-genomic DNA microarray as well as a single nucleotide polymorphism (SNP) based analysis. Herein, we present and compare, the two recently developed sub-typing technologies and discuss how these methods are not only important in outbreak investigations, but could also shed light on possible adaptations to different foods and environments.
Collapse
Affiliation(s)
- Atin R Datta
- Center for Food Safety and Applied Nutrition, Food and Drug Administration, Laurel, MD, 20708, USA.
| | - Laurel S Burall
- Center for Food Safety and Applied Nutrition, Food and Drug Administration, Laurel, MD, 20708, USA
| |
Collapse
|
59
|
Braga V, Vázquez S, Vico V, Pastorino V, Mota MI, Legnani M, Schelotto F, Lancibidad G, Varela G. Prevalence and serotype distribution of Listeria monocytogenes isolated from foods in Montevideo-Uruguay. Braz J Microbiol 2017. [PMID: 28629969 PMCID: PMC5628299 DOI: 10.1016/j.bjm.2017.01.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The aim of this work was to study the prevalence of Listeria monocytogenes in foods obtained in retail shops and food industries located in Montevideo-Uruguay, and to identify the serogroups of the obtained isolates. Three-thousand one-hundred and seventy-five food samples (frozen, deli meats, ready-to-eat and cheese) were analyzed. The obtained isolates were serogrouped by multiplex PCR and serotyped by conventional procedure. Genetic comparisons were performed using pulsed-field gel electrophoresis on a sub-set of isolates belonging to the same serotype successively recovered from the same establishment. L. monocytogenes was isolated from 11.2% of samples. The highest prevalence was observed in frozen foods (38%), followed by cheese (10%). 1/2b and 4b were the most frequently identified serotypes. In six of 236 analyzed establishments we successively recovered L. monocytogenes isolates belonging to the same serotype. Most of them corresponded to serotype 1/2b. Pulsed-field gel electrophoresis profiles suggest that at least 33% of L. monocytogenes 1/2b isolates are genetically related and that may remain viable for prolonged periods. The observed prevalence of L. monocytogenes was lower than reported in neighboring countries. Our findings highlight the role that frozen foods may play in the spread of this pathogen, and the relevance of serotypes 1/2b and 4b.
Collapse
Affiliation(s)
- Valeria Braga
- Laboratorio de Bromatología - Intendencia de Montevideo, Isla de Flores 1323, Montevideo, Uruguay; Departamento de Bacteriología y Virología - Instituto de Higiene, Facultad de Medicina - UdelaR, Montevideo, Uruguay
| | - Sylvia Vázquez
- Laboratorio de Bromatología - Intendencia de Montevideo, Isla de Flores 1323, Montevideo, Uruguay
| | - Victoria Vico
- Departamento de Bacteriología y Virología - Instituto de Higiene, Facultad de Medicina - UdelaR, Montevideo, Uruguay
| | - Valeria Pastorino
- Laboratorio de Bromatología - Intendencia de Montevideo, Isla de Flores 1323, Montevideo, Uruguay
| | - María Inés Mota
- Departamento de Bacteriología y Virología - Instituto de Higiene, Facultad de Medicina - UdelaR, Montevideo, Uruguay
| | - Marcela Legnani
- Laboratorio de Bromatología - Intendencia de Montevideo, Isla de Flores 1323, Montevideo, Uruguay
| | - Felipe Schelotto
- Departamento de Bacteriología y Virología - Instituto de Higiene, Facultad de Medicina - UdelaR, Montevideo, Uruguay
| | - Gustavo Lancibidad
- Laboratorio de Bromatología - Intendencia de Montevideo, Isla de Flores 1323, Montevideo, Uruguay
| | - Gustavo Varela
- Departamento de Bacteriología y Virología - Instituto de Higiene, Facultad de Medicina - UdelaR, Montevideo, Uruguay.
| |
Collapse
|
60
|
Shenoy AG, Oliver HF, Deering AJ. Listeria monocytogenes Internalizes in Romaine Lettuce Grown in Greenhouse Conditions. J Food Prot 2017; 80:573-581. [PMID: 28271926 DOI: 10.4315/0362-028x.jfp-16-095] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Listeria monocytogenes has been implicated in a number of outbreaks involving fresh produce, including an outbreak in 2016 resulting from contaminated packaged salads. The persistence and internalization potential of L. monocytogenes in romaine lettuce was evaluated, and the persistence of two L. monocytogenes strains was assessed on three romaine lettuce cultivars. Seeds were germinated, and plants grown in three soil types (i.e., standard potting mix, autoclaved potting mix, and top soil) and sterile soft-top agar for up to 21 days. Average CFU per gram of L. monocytogenes on seeds and plants was calculated from five replicates per harvest day. Up to 8.2 log CFU/g L. monocytogenes persisted on romaine lettuce plants (Braveheart cultivar) grown in soft-top agar, while those grown in commercial potting mix (initial soil aerobic plate count of 4.0 × 104 CFU/g) had a final concentration of 5.4 log CFU/g, and autoclaved commercial potting mix had a final concentration of 3.8 ± 0.2 log CFU/g after a 21-day period. Pathogen levels dropped below the limit of detection (2 log CFU/g) by day 18 in 75% topsoil (initial soil aerobic plate count of 4.0 × 101 CFU/g); this did not occur in sterile media. Although L. monocytogenes strain differences and presence of a clay coating on seeds did not affect persistence, differences were observed in L. monocytogenes growth and survival among cultivars. To assess internalization, seeds were inoculated with L. monocytogenes expressing green fluorescent protein. Three plants were fixed, paraffin embedded, and sectioned; localization was studied by using standard immunohistochemistry techniques. A total of 539 internalized L. monocytogenes cells were visualized among three 20-day seedlings. L. monocytogenes cells were located in all major tissue types (pith followed by cortex, xylem, phloem, and epidermis). The presence of L. monocytogenes in the plant vasculature suggests potential for transport throughout the plant into edible tissue.
Collapse
Affiliation(s)
- Archana G Shenoy
- Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, Indiana 47907, USA
| | - Haley F Oliver
- Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, Indiana 47907, USA
| | - Amanda J Deering
- Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, Indiana 47907, USA
| |
Collapse
|
61
|
Listeria monocytogenes ability to survive desiccation: Influence of serotype, origin, virulence, and genotype. Int J Food Microbiol 2017; 248:82-89. [PMID: 28288399 DOI: 10.1016/j.ijfoodmicro.2017.02.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 01/12/2017] [Accepted: 02/18/2017] [Indexed: 11/22/2022]
Abstract
Listeria monocytogenes, a bacterium that is responsible for listeriosis, is a very diverse species. Desiccation resistance has been rarely studied in L. monocytogenes, although it is a stress that is largely encountered by this microorganism in food-processing environments and that could be managed to prevent its presence. The objective of this study was to evaluate the resistance of 30 L. monocytogenes strains to moderate desiccation (75% relative humidity) and evaluate the correlation of such resistance with the strains' virulence, serotype and genotype. The results showed a great heterogeneity of strains regarding their ability to survive (loss of cultivability between 0.4 and 2.0 log). Strains were classified into three groups according to desiccation resistance (sensitive, intermediate, or resistant), and the strain repartition was analyzed relative to serotype, virulence level and environmental origin of the strains. No correlation was found between isolate origin and desiccation resistance. All serotype 1/2b strains were classified into the group of resistant strains. Virulent and hypovirulent strains were distributed among the three groups of desiccation resistance. Finally, a genomic comparison was performed based on 31 genes that were previously identified as being involved in desiccation resistance. The presence of those genes was localized among the genomes of some strains and compared regarding strain-resistance levels. High nucleotide conservation was identified between resistant and desiccation-sensitive strains. In conclusion, the findings regarding the strains of serotype 1/2b indicate potential serotype-specific resistance to desiccation, and thus, to relative humidity fluctuations potentially encountered in food-related environments. The genomic comparison of 31 genes associated to desiccation tolerance did not reveal differences among four strains which have different level of resistance to desiccation.
Collapse
|
62
|
Sharma S, Sharma V, Dahiya DK, Khan A, Mathur M, Sharma A. Prevalence, Virulence Potential, and Antibiotic Susceptibility Profile of Listeria monocytogenes Isolated From Bovine Raw Milk Samples Obtained From Rajasthan, India. Foodborne Pathog Dis 2017; 14:132-140. [PMID: 28085487 DOI: 10.1089/fpd.2016.2118] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Listeriosis is a serious foodborne disease of a global concern, and can effectively be controlled by a continuous surveillance of the virulent and multidrug-resistant strains of Listeria monocytogenes. This study was planned to investigate prevalence of L. monocytogenes in bovine raw milk samples. A total of 457 raw milk samples collected from 15 major cities in Rajasthan, India, were analyzed for the presence of L. monocytogenes by using standard microbiological and molecular methods. Five of the 457 samples screen tested positive for L. monocytogenes. Multiplex serotyping showed that 3/5 strains belonged to serotype 4b followed by one strain each to 1/2a and to 1/2c. Further virulence potential assessment indicated that all strains possessed inlA and inlC internalins, and, in addition, two strains also possessed the gene for inlB. All strains were positive for Listeriolysin O (LLO) and showed phosphatidylinositol-specific phospholipase C (PI-PLC) activity on an in vitro agar medium with variations in production levels among the strains. A good correlation between the in vitro pathogenicity test and the chick embryo test was observed, as the strains showing higher LLO and PI-PLC activity were found to be lethal to fertilized chick embryos. All strains were resistant to the majority of antibiotics and were designated as multidrug-resistant strains. However, these strains were susceptible to 9 of the 22 tested antibiotics. The maximum zone of inhibition (mm) and acceptable minimum inhibitory concentration were observed with azithromycin, and thus it could be the first choice of a treatment. Overall, the presence of multidrug-resistant L. monocytogenes strains in the raw milk of Rajasthan region is an indicator of public health hazard and highlighting the need of consumer awareness in place and implementation of stricter food safety regulations at all levels of milk production.
Collapse
Affiliation(s)
- Sanjita Sharma
- Advanced Milk Testing Research Laboratory, Post Graduate Institute of Veterinary Education and Research , Mansarovar, Jaipur, Rajasthan, India
| | - Vishnu Sharma
- Advanced Milk Testing Research Laboratory, Post Graduate Institute of Veterinary Education and Research , Mansarovar, Jaipur, Rajasthan, India
| | - Dinesh Kumar Dahiya
- Advanced Milk Testing Research Laboratory, Post Graduate Institute of Veterinary Education and Research , Mansarovar, Jaipur, Rajasthan, India
| | - Aarif Khan
- Advanced Milk Testing Research Laboratory, Post Graduate Institute of Veterinary Education and Research , Mansarovar, Jaipur, Rajasthan, India
| | - Manisha Mathur
- Advanced Milk Testing Research Laboratory, Post Graduate Institute of Veterinary Education and Research , Mansarovar, Jaipur, Rajasthan, India
| | - Amit Sharma
- Advanced Milk Testing Research Laboratory, Post Graduate Institute of Veterinary Education and Research , Mansarovar, Jaipur, Rajasthan, India
| |
Collapse
|
63
|
Wieczorek K, Osek J. Prevalence, genetic diversity and antimicrobial resistance of Listeria monocytogenes isolated from fresh and smoked fish in Poland. Food Microbiol 2017; 64:164-171. [PMID: 28213022 DOI: 10.1016/j.fm.2016.12.022] [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: 08/23/2016] [Revised: 12/28/2016] [Accepted: 12/28/2016] [Indexed: 11/30/2022]
Abstract
A total of 57 out of 301 (18.9%) fresh and smoked fish samples in Poland were positive for Listeria monocytotgenes. The bacteria were most frequently identified in fresh and smoked salmon (32.0% and 33.8% respectively) as well as in fresh cod (31.8%). Only three samples of smoked salmon were contaminated with the bacteria above 100 CFU/g. Four molecular serogroups were identified and the most prevalent, 1/2a-3a (40 isolates; 70.2%), was present in samples from both marine (33 strains; 71.7%) and freshwater fish (7 isolates; 63.6%). Similar duality of prevalence was observed only for L. monocytogenes of 1/2b-3b-7 serogroup (14 strains; 24.6%), which was identified in 11 (23.9%) marine and 3 (27.3%) freshwater fish. All isolates harboured 10 virulence-associated genes (inlA, inlB, inlC, inlJ, lmo2672, plcA, plcB, hlyA, actA, and mpl) and most of them (56; 98.2%) also possessed the flaA marker. Several strains displayed resistance to oxacillin (33; 57.9%), ceftriaxone (18; 31.6%), or clindamycin (5; 8.8%), and two isolates of serogroup 1/2a-3a showed multiresistance to all three. Genetic subtyping showed the presence of different pulsotypes belonging to six PFGE clusters. The obtained results provide useful information regarding fish contamination with L. monocytogenes which may have implications for public health.
Collapse
Affiliation(s)
- Kinga Wieczorek
- Department of Hygiene of Food of Animal Origin, National Veterinary Research Institute, Partyzantow 57, 24-100 Pulawy, Poland
| | - Jacek Osek
- Department of Hygiene of Food of Animal Origin, National Veterinary Research Institute, Partyzantow 57, 24-100 Pulawy, Poland.
| |
Collapse
|
64
|
Rapid detection of Listeria monocytogenes in food by biofunctionalized magnetic nanoparticle based on nuclear magnetic resonance. Food Control 2017. [DOI: 10.1016/j.foodcont.2016.06.028] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
65
|
Alhogail S, Suaifan GA, Zourob M. Rapid colorimetric sensing platform for the detection of Listeria monocytogenes foodborne pathogen. Biosens Bioelectron 2016; 86:1061-1066. [DOI: 10.1016/j.bios.2016.07.043] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 07/05/2016] [Accepted: 07/12/2016] [Indexed: 12/16/2022]
|
66
|
Calderon-Gonzalez R, Teran-Navarro H, Marimon JM, González-Rico C, Calvo-Montes J, Frande-Cabanes E, Alkorta-Gurrutxaga M, Fariñas MC, Martínez-Martínez L, Perez-Trallero E, Alvarez-Dominguez C. Biomarker Tools to Design Clinical Vaccines Determined from a Study of Annual Listeriosis Incidence in Northern Spain. Front Immunol 2016; 7:541. [PMID: 27965668 PMCID: PMC5126465 DOI: 10.3389/fimmu.2016.00541] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 11/16/2016] [Indexed: 12/23/2022] Open
Abstract
Two regions of northern Spain, Gipuzkoa, and Cantabria present high annual incidence of listeriosis (1.86 and 1.71 cases per 100,000 inhabitants, respectively). We report that the high annual incidences are a consequence of infection with highly virulent Listeria monocytogenes isolates linked to fatal outcomes in elderly patients with cancer. In addition, listeriosis patients with cancer present low IL-17A/IL-6 ratios and significantly reduced levels of anti-GAPDH1–22 antibodies, identified as two novel biomarkers of poor prognosis. Analysis of these biomarkers may aid in reducing the incidence of listeriosis. Moreover, GAPDH1–22-activated monocyte-derived dendritic cells of listeriosis patients with cancer seem useful tools to prepare clinical vaccines as they produce mainly Th1 cytokines.
Collapse
Affiliation(s)
- Ricardo Calderon-Gonzalez
- Grupo de Nanovacunas y vacunas celulares basadas en Listeria y sus aplicaciones en biomedicine, Instituto de Investigación Marqués de Valdecilla (IDIVAL) , Santander , Spain
| | - Hector Teran-Navarro
- Grupo de Nanovacunas y vacunas celulares basadas en Listeria y sus aplicaciones en biomedicine, Instituto de Investigación Marqués de Valdecilla (IDIVAL) , Santander , Spain
| | - José María Marimon
- Servicio de Microbiología, Instituto de Investigación Sanitaria Biodonostia, Hospital Universitario Donostia, San Sebastián, Spain; CIBER de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Claudia González-Rico
- Sección de Enfermedades Infecciosas, Hospital Universitario Marques de Valdecilla , Santander , Spain
| | - Jorge Calvo-Montes
- Servicio de Microbiología, Hospital Universitario Marques de Valdecilla , Santander , Spain
| | - Elisabet Frande-Cabanes
- Grupo de Nanovacunas y vacunas celulares basadas en Listeria y sus aplicaciones en biomedicine, Instituto de Investigación Marqués de Valdecilla (IDIVAL) , Santander , Spain
| | - Miriam Alkorta-Gurrutxaga
- Servicio de Microbiología, Instituto de Investigación Sanitaria Biodonostia, Hospital Universitario Donostia, San Sebastián, Spain; CIBER de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - M C Fariñas
- Sección de Enfermedades Infecciosas, Hospital Universitario Marques de Valdecilla, Santander, Spain; Departamento de Medicina y Psiquiatría, Universidad de Cantabria, Santander, Spain
| | - Luis Martínez-Martínez
- Servicio de Microbiología, Hospital Universitario Marques de Valdecilla, Santander, Spain; Departamento de Biología Molecular, Universidad de Cantabria, Santander, Spain
| | - Emilio Perez-Trallero
- Servicio de Microbiología, Instituto de Investigación Sanitaria Biodonostia, Hospital Universitario Donostia, San Sebastián, Spain; CIBER de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Carmen Alvarez-Dominguez
- Grupo de Nanovacunas y vacunas celulares basadas en Listeria y sus aplicaciones en biomedicine, Instituto de Investigación Marqués de Valdecilla (IDIVAL) , Santander , Spain
| |
Collapse
|
67
|
Haubert L, Mendonça M, Lopes GV, de Itapema Cardoso MR, da Silva WP. Listeria monocytogenes isolates from food and food environment harbouring tetM and ermB resistance genes. Lett Appl Microbiol 2016; 62:23-9. [PMID: 26518475 DOI: 10.1111/lam.12516] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 10/23/2015] [Accepted: 10/25/2015] [Indexed: 11/30/2022]
Abstract
UNLABELLED Listeria monocytogenes is a foodborne pathogen that has become an important cause of human and animal diseases worldwide. The purpose of this study was to evaluate the serotypes, virulence potential, antimicrobial resistance profile, and genetic relationships of 50 L. monocytogenes isolates from food and food environment in southern Brazil. In this study, the majority of L. monocytogenes isolates belonged to the serotypes 1/2b (42%) and 4b (26%), which are the main serotypes associated with human listeriosis. In addition, all isolates harboured internalin genes (inlA, inlC, inlJ), indicating a virulence potential. The isolates were sensitive to most of the antimicrobial compounds analysed, and five isolates (10%) were multi-resistant. Two isolates harboured antimicrobial resistance genes (tetM and ermB) and in one of them, the gene was present in the plasmid. Moreover, according to the pulsed field gel electrophoresis assay, two multi-resistant isolates were a single clone isolated from food and the processing plant. The isolates were susceptible to the most frequently used antibiotics for listeriosis treatment. However, the presence of multidrug-resistant isolates and antimicrobial resistance genes including in the plasmid could even be transferred between bacterial species, suggesting a potential health risk to consumers and a potential risk of spreading multi-resistance genes to other bacteria. SIGNIFICANCE AND IMPACT OF THE STUDY Listeria monocytogenes is an important agent of foodborne diseases. The results of this study suggest a potential capacity of L. monocytogenes isolates from food and food environment to cause human infections. Antimicrobial multi-resistance profiles were detected in 10%, and two isolates harboured tetM and ermB resistance genes. Moreover, the present research can help to build up a better knowledge about antimicrobial resistance of L. monocytogenes. Additionally, we found one isolate carrying tetM resistance gene in a plasmid, that suggests a possible transmission between commensal and/or other pathogenic bacteria of food environment, thereby raising up concerns regarding bacterial resistance.
Collapse
Affiliation(s)
- L Haubert
- Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas (UFPel), Pelotas, RS, Brazil.,Núcleo de Biotecnologia, Centro de Desenvolvimento Tecnológico, Universidade Federal de Pelotas (UFPel), Pelotas, RS, Brazil
| | - M Mendonça
- Núcleo de Biotecnologia, Centro de Desenvolvimento Tecnológico, Universidade Federal de Pelotas (UFPel), Pelotas, RS, Brazil
| | - G V Lopes
- Departamento de Medicina Veterinária Preventiva, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - M R de Itapema Cardoso
- Departamento de Medicina Veterinária Preventiva, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - W P da Silva
- Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas (UFPel), Pelotas, RS, Brazil.,Núcleo de Biotecnologia, Centro de Desenvolvimento Tecnológico, Universidade Federal de Pelotas (UFPel), Pelotas, RS, Brazil
| |
Collapse
|
68
|
Identification of Surface Protein Biomarkers of Listeria monocytogenes via Bioinformatics and Antibody-Based Protein Detection Tools. Appl Environ Microbiol 2016; 82:5465-76. [PMID: 27342549 DOI: 10.1128/aem.00774-16] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 06/01/2016] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED The Gram-positive bacterium Listeria monocytogenes causes a significant percentage of the fatalities among foodborne illnesses in humans. Surface proteins specifically expressed in a wide range of L. monocytogenes serotypes under selective enrichment culture conditions could serve as potential biomarkers for detection and isolation of this pathogen via antibody-based methods. Our study aimed to identify such biomarkers. Interrogation of the L. monocytogenes serotype 4b strain F2365 genome identified 130 putative or known surface proteins. The homologues of four surface proteins, LMOf2365_0578, LMOf2365_0581, LMOf2365_0639, and LMOf2365_2117, were assessed as biomarkers due to the presence of conserved regions among strains of L. monocytogenes which are variable among other Listeria species. Rabbit polyclonal antibodies against the four recombinant proteins revealed the expression of only LMOf2365_0639 on the surface of serotype 4b strain LI0521 cells despite PCR detection of mRNA transcripts for all four proteins in the organism. Three of 35 monoclonal antibodies (MAbs) to LMOf2365_0639, MAbs M3643, M3644, and M3651, specifically recognized 42 (91.3%) of 46 L. monocytogenes lineage I and II isolates grown in nonselective brain heart infusion medium. While M3644 and M3651 reacted with 14 to 15 (82.4 to 88.2%) of 17 L. monocytogenes lineage I and II isolates, M3643 reacted with 22 (91.7%) of 24 lineage I, II, and III isolates grown in selective enrichment media (UVM1, modified Fraser, Palcam, and UVM2 media). The three MAbs exhibited only weak reactivities (the optical densities at 414 nm were close to the cutoff value) to some other Listeria species grown in selective enrichment media. Collectively, the data indicate the potential of LMOf2365_0639 as a surface biomarker of L. monocytogenes, with the aid of specific MAbs, for pathogen detection, identification, and isolation in clinical, environmental, and food samples. IMPORTANCE L. monocytogenes is traditionally divided into at least 12 serotypes. Currently, there are no monoclonal antibodies (MAbs) available that are capable of binding to the surface of L. monocytogenes strains representing all 12 serotypes. Such antibodies would be useful and are needed for the development of methods to detect and isolate L. monocytogenes from food samples. In our study, we aimed to identify surface proteins that possess regions of well-conserved amino acid sequences among various serotypes and then to employ them as antigen targets (biomarkers) for the development of MAbs. Through bioinformatics and protein expression analysis, we identified one of the four putative surface protein candidates, LMOf2365_0639, encoded by the genome of the L. monocytogenes serotype 4b strain F2365, as a useful surface biomarker. Extensive assessment of 35 MAbs raised against LMOf2365_0639 in our study revealed three MAbs (M3643, M3644, and M3651) that recognized a wide range of L. monocytogenes isolates.
Collapse
|
69
|
Molecular Characterization and Phylogenetic Analysis of Listeria monocytogenes Isolated from Milk and Milk Products in Kaduna, Nigeria. CANADIAN JOURNAL OF INFECTIOUS DISEASES & MEDICAL MICROBIOLOGY 2016; 2016:4313827. [PMID: 27597873 PMCID: PMC4997079 DOI: 10.1155/2016/4313827] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2016] [Revised: 06/28/2016] [Accepted: 07/11/2016] [Indexed: 11/17/2022]
Abstract
In this study, Listeria (L.) monocytogenes isolated from milk and milk products in Kaduna, Nigeria, were subjected to a multiplex PCR assay to identify virulence-associated genes (such as prf A, inl A, hly A, act A, and iap). Of the 36 isolates, 9 (25%) were positive for one or two virulence-associated genes. Based on the sample type, 6 (16.9%) of the isolates that possessed virulence-associated genes were obtained from raw milk, 2 (3.2%) from “Manshanu,” and 1 (2.8%) from “Kindrimo.” Sequence and phylogenetic analysis based on the 16S rRNA revealed that Nigerian L. monocytogenes isolates (NGA 34A, NGA 35A, NGA 41A, and NGA 38A), when compared with reference L. monocytogenes, were grouped into two distinct clusters, A and B, with sequence (NGA 34A, NGA 35A, and NGA 41A) phylogenetically closer to J1776; N1-011A; R2-502; J1816; and J2-031, whereas L. monocytogenes isolate (NGA 38A) clustered with EDG; J1-220; J1926; J1817; and J2-1091. The separation of the Nigerian L. monocytogenes isolates into linage A (responsible for epidemic listeriosis) and lineage B (responsible for sporadic cases of listeriosis) is of public health concern and that local isolates might have potentials for human food borne listeriosis based on the virulence factors so far identified.
Collapse
|
70
|
Camargo AC, Woodward JJ, Nero LA. The Continuous Challenge of Characterizing the Foodborne Pathogen Listeria monocytogenes. Foodborne Pathog Dis 2016; 13:405-16. [PMID: 27120361 DOI: 10.1089/fpd.2015.2115] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Listeria monocytogenes is an important foodborne pathogen commonly isolated from food processing environments and food products. This organism can multiply at refrigeration temperatures, form biofilms on different materials and under various conditions, resist a range of environmental stresses, and contaminate food products by cross-contamination. L. monocytogenes is recognized as the causative agent of listeriosis, a serious disease that affects mainly individuals from high-risk groups, such as pregnant women, newborns, the elderly, and immunocompromised individuals. Listeriosis can be considered a disease that has emerged along with changing eating habits and large-scale industrial food processing. This disease causes losses of billions of dollars every year with recalls of contaminated foods and patient medical treatment expenses. In addition to the immune status of the host and the infecting dose, the virulence potential of each strain is crucial for the development of disease symptoms. While many isolates are naturally virulent, other isolates are avirulent and unable to cause disease; this may vary according to the presence of molecular determinants associated with virulence. In the last decade, the characterization of genetic profiles through the use of molecular methods has helped track and demonstrate the genetic diversity among L. monocytogenes isolates obtained from various sources. The purposes of this review were to summarize the main methods used for isolation, identification, and typing of L. monocytogenes and also describe its most relevant virulence characteristics.
Collapse
Affiliation(s)
- Anderson Carlos Camargo
- 1 Departamento de Veterinária, Universidade Federal de Viçosa , Viçosa, Minas Gerais, Brazil
| | | | - Luís Augusto Nero
- 1 Departamento de Veterinária, Universidade Federal de Viçosa , Viçosa, Minas Gerais, Brazil
| |
Collapse
|
71
|
Supa-Amornkul S, Chantratita W, Srichunrusami C, Janchompoo P, Chaturongakul S. Listeria monocytogenes MerR-Like Regulator NmlRlm: Its Transcriptome and Role in Stress Response. Foodborne Pathog Dis 2016; 13:369-78. [PMID: 27058117 DOI: 10.1089/fpd.2015.2101] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
NmlR, a negative transcription regulator in the MerR family, is involved in oxidative and nitrosative stress response in Neisseria gonorrhoeae and Haemophilus influenzae. In this study, the objective was to characterize the role and the regulon of NmlR in the foodborne Listeria monocytogenes. An L. monocytogenes nmlR null mutant strain was constructed. Transcriptomes of strain 10403S wild type (WT) and ΔnmlRlm strains grown to the stationary phase were determined by mRNA sequencing. Differential expression analyses revealed 74 genes with altered expression levels (>9-fold difference), comprising 46 negatively and 28 positively regulated genes. Twenty-four NmlRlm-dependent genes overlap with the members of previously identified regulons of HrcA, a negative regulator of heat response in L. monocytogenes, and of alternative sigma factor σ(H). Phenotypic characterization revealed that the ΔnmlRlm strain survived significantly less than the WT under acid stress (pH 2.5 for 1 h) and oxidative stress (3% hydrogen peroxide for 1 h). In addition, nmlRlm deletion also resulted in a significant decrease (p < 0.0005) of cell length and enhanced intracellular growth in a differentiated macrophage-like U937 cell line during entry into stationary phase. These findings indicate that NmlRlm is not only involved in oxidative stress response but also contributes to other characteristics such as acid tolerance and intracellular growth, either through direct regulation or co-regulation with other regulators such as HrcA and σ(H).
Collapse
Affiliation(s)
- Sirirak Supa-Amornkul
- 1 Faculty of Science, Department of Microbiology, Mahidol University , Bangkok, Thailand
| | - Wasun Chantratita
- 2 Virology Laboratory, Faculty of Medicine, Department of Pathology, Ramathibodi Hospital, Mahidol University , Bangkok, Thailand
| | - Chutatip Srichunrusami
- 3 Faculty of Science, Center for Emerging Bacterial Infections, Mahidol University , Bangkok, Thailand
| | - Pareena Janchompoo
- 2 Virology Laboratory, Faculty of Medicine, Department of Pathology, Ramathibodi Hospital, Mahidol University , Bangkok, Thailand
| | - Soraya Chaturongakul
- 1 Faculty of Science, Department of Microbiology, Mahidol University , Bangkok, Thailand .,3 Faculty of Science, Center for Emerging Bacterial Infections, Mahidol University , Bangkok, Thailand
| |
Collapse
|
72
|
Budiati T, Rusul G, Wan-Abdullah WN, Chuah LO, Ahmad R, Thong KL. Genetic Relatedness of Salmonella Serovars Isolated from Catfish (Clarias gariepinus) and Tilapia (Tilapia mossambica) Obtained from Wet Markets and Ponds in Penang, Malaysia. J Food Prot 2016; 79:659-65. [PMID: 27052872 DOI: 10.4315/0362-028x.jfp-15-372] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A total of 43 Salmonella enterica isolates belonging to different serovars (Salmonella Albany, Salmonella Agona, Salmonella Corvallis, Salmonella Stanley, Salmonella Typhimurium, Salmonella Mikawasima, and Salmonella Bovismorbificans) were isolated from catfish (Clarias gariepinus) and tilapia (Tilapia mossambica) obtained from nine wet markets and eight ponds in Penang, Malaysia. Thirteen, 19, and 11 isolates were isolated from 9 of 32 catfish, 14 of 32 tilapia, and 11 of 44 water samples, respectively. Fish reared in ponds were fed chicken offal, spoiled eggs, and commercial fish feed. The genetic relatedness of these Salmonella isolates was determined by random amplified polymorphic DNA PCR (RAPD-PCR) using primer OPC2, repetitive extragenic palindromic PCR (REP-PCR), and pulsed-field gel electrophoresis (PFGE). Composite analysis of the RAPD-PCR, REP-PCR, and PFGE results showed that the Salmonella serovars could be differentiated into six clusters and 15 singletons. RAPD-PCR differentiated the Salmonella isolates into 11 clusters and 10 singletons, while REP-PCR differentiated them into 4 clusters and 1 singleton. PFGE differentiated the Salmonella isolates into seven clusters and seven singletons. The close genetic relationship of Salmonella isolates from catfish or tilapia obtained from different ponds, irrespective of the type of feed given, may be caused by several factors, such as the quality of the water, density of fish, and size of ponds.
Collapse
Affiliation(s)
- Titik Budiati
- Food Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia; Food Technology Department, State Polytechnic of Jember, 68121 Jember, Indonesia
| | - Gulam Rusul
- Food Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia.
| | - Wan Nadiah Wan-Abdullah
- Bioprocess Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia
| | - Li-Oon Chuah
- Food Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia
| | - Rosma Ahmad
- Bioprocess Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia
| | - Kwai Lin Thong
- Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
| |
Collapse
|
73
|
Nori P, Szymczak W, Park C, Gialanella P, Munjal I, Chung P, Guo Y, Williamson J, Ostrowsky B, Levi M. Matrix-Assisted Laser Desorption Ionization–Time of Flight Mass Spectrometry as a First-Line Diagnostic Modality in Bacterial Meningitis and Septicemia: a Report of Five Cases. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.clinmicnews.2016.03.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
74
|
Maćkiw E, Modzelewska M, Mąka Ł, Ścieżyńska H, Pawłowska K, Postupolski J, Korsak D. Antimicrobial resistance profiles of Listeria monocytogenes isolated from ready-to-eat products in Poland in 2007–2011. Food Control 2016. [DOI: 10.1016/j.foodcont.2015.05.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
75
|
Camargo AC, Vallim DC, Hofer E, Nero LA. Molecular Serogrouping of Listeria monocytogenes from Brazil Using PCR. J Food Prot 2016; 79:144-7. [PMID: 26735041 DOI: 10.4315/0362-028x.jfp-15-294] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We assessed the serotype distribution of Listeria monocytogenes isolates from clinical, beef, and environment samples using two PCR-based protocols for serogrouping. A panel of 134 isolates (22 clinical samples, 79 samples of beef cuts, and 33 samples from the beef processing environment) were subjected to conventional serology and identified as serotypes 1/2a (n = 12), 1/2b (n = 21), 1/2c (n = 71), and 4b (n = 30). Isolates from clinical samples were predominantly serotype 4b, and the most prevalent serotype among the beef cut and environment samples was 1/2c. The protocol described by M. Doumith, C. Buchrieser, P. Glaser, C. Jacquet, and P. Martin (J. Clin. Microbiol. 42:3819-3822, 2004) produced contradictory results for seven 1/2a isolates, which were positive for lmo1118 and had the profile IIc (serotypes 1/2c and 3c). Fifteen serotype 4b isolates amplified the target lmo0737, with the atypical profile IVb variant 1. The results obtained with the protocol described by M. K. Borucki and D. R. Call (J. Clin. Microbiol. 41:5537-5540, 2003) were in full agreement with those of the conventional serology. We recommend using this multiplex PCR approach by adding one pair of the reported primers to the panel to reduce total effort by one PCR while maintaining specificity. We present additional recommendations to improve the efficiency and reproducibility of this serogrouping assay.
Collapse
Affiliation(s)
| | - Deyse Christina Vallim
- Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Laboratório de Zoonoses Bacterianas, Rio de Janeiro, RJ, Brazil
| | - Ernesto Hofer
- Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Laboratório de Zoonoses Bacterianas, Rio de Janeiro, RJ, Brazil
| | - Luís Augusto Nero
- Universidade Federal de Viçosa, Departamento de Veterinária, Viçosa, MG, Brazil.
| |
Collapse
|
76
|
Shaul P, Benhamou RI, Herzog IM, Louzoun Zada S, Ebenstein Y, Fridman M. Synthesis and evaluation of membrane permeabilizing properties of cationic amphiphiles derived from the disaccharide trehalose. Org Biomol Chem 2016; 14:3012-5. [DOI: 10.1039/c6ob00031b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Cationic amphiphiles derived from trehalose have been synthesized; trehalose analogues substituted withn-pentyl orn-hexyl ethers exhibited membrane disrupting activities against clinically important Gram positive and Gram negative bacteria and fungi.
Collapse
Affiliation(s)
- P. Shaul
- School of Chemistry
- Raymond and Beverly Sackler Faculty of Exact Sciences
- Tel Aviv University
- Tel Aviv
- Israel
| | - R. I. Benhamou
- School of Chemistry
- Raymond and Beverly Sackler Faculty of Exact Sciences
- Tel Aviv University
- Tel Aviv
- Israel
| | - I. M. Herzog
- School of Chemistry
- Raymond and Beverly Sackler Faculty of Exact Sciences
- Tel Aviv University
- Tel Aviv
- Israel
| | - S. Louzoun Zada
- School of Chemistry
- Raymond and Beverly Sackler Faculty of Exact Sciences
- Tel Aviv University
- Tel Aviv
- Israel
| | - Y. Ebenstein
- School of Chemistry
- Raymond and Beverly Sackler Faculty of Exact Sciences
- Tel Aviv University
- Tel Aviv
- Israel
| | - M. Fridman
- School of Chemistry
- Raymond and Beverly Sackler Faculty of Exact Sciences
- Tel Aviv University
- Tel Aviv
- Israel
| |
Collapse
|
77
|
García JA, Micheloud JF, Campero CM, Morrell EL, Odriozola ER, Moreira AR. Enteric listeriosis in grazing steers supplemented with spoiled silage. J Vet Diagn Invest 2015; 28:65-9. [DOI: 10.1177/1040638715616658] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
An outbreak of enteric listeriosis in steers that were fed spoiled silage is reported. The outbreak started 2 days after ~200 animals in a single paddock were given a supplement of spoiled silage. Forty animals (20%) were affected, and 13 (6.5%) died over a period of 10 days. Affected animals were recumbent, depressed, and had diarrhea with mucus and fibrin. Gross and microscopic findings in 3 animals that were subjected to autopsy included excess peritoneal fluid, congestion and edema of abomasum, suppurative enteritis and colitis, and suppurative mesenteric lymphadenitis. Two strains of Listeria monocytogenes were isolated, one of serotype 1/2c from the gallbladder and one of serotype 1/2b from the spoiled silage. Listeria monocytogenes was detected in the mesenteric lymph nodes and intestinal wall of 1 animal by immunohistochemistry (IHC). Clinical history and signs, gross and microscopic findings, bacterial isolation, and IHC results confirmed a diagnosis of enteric listeriosis. The source of infection was likely the spoiled silage.
Collapse
Affiliation(s)
- Juan A. García
- Residence Veterinary Program (Garcia, Micheloud) and Animal Health Group (Campero, Odriozola, Morrell, Moreira) of the National Institute of Agrarian Technology (INTA), Balcarce, Argentina
| | - Juan F. Micheloud
- Residence Veterinary Program (Garcia, Micheloud) and Animal Health Group (Campero, Odriozola, Morrell, Moreira) of the National Institute of Agrarian Technology (INTA), Balcarce, Argentina
| | - Carlos M. Campero
- Residence Veterinary Program (Garcia, Micheloud) and Animal Health Group (Campero, Odriozola, Morrell, Moreira) of the National Institute of Agrarian Technology (INTA), Balcarce, Argentina
| | - Eleonora L. Morrell
- Residence Veterinary Program (Garcia, Micheloud) and Animal Health Group (Campero, Odriozola, Morrell, Moreira) of the National Institute of Agrarian Technology (INTA), Balcarce, Argentina
| | - Ernesto R. Odriozola
- Residence Veterinary Program (Garcia, Micheloud) and Animal Health Group (Campero, Odriozola, Morrell, Moreira) of the National Institute of Agrarian Technology (INTA), Balcarce, Argentina
| | - Ana R. Moreira
- Residence Veterinary Program (Garcia, Micheloud) and Animal Health Group (Campero, Odriozola, Morrell, Moreira) of the National Institute of Agrarian Technology (INTA), Balcarce, Argentina
| |
Collapse
|
78
|
Coroneo V, Carraro V, Aissani N, Sanna A, Ruggeri A, Succa S, Meloni B, Pinna A, Sanna C. Detection of Virulence Genes and Growth Potential inListeria monocytogenesStrains Isolated from Ricotta Salata Cheese. J Food Sci 2015; 81:M114-20. [DOI: 10.1111/1750-3841.13173] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 11/01/2015] [Indexed: 01/20/2023]
Affiliation(s)
- Valentina Coroneo
- Dept. of Public Health, Clinical and Molecular Medicine; Univ. of Cagliari; Italy Via Porcell 4 09124 Cagliari Italy
| | - Valentina Carraro
- Dept. of Public Health, Clinical and Molecular Medicine; Univ. of Cagliari; Italy Via Porcell 4 09124 Cagliari Italy
| | - Nadhem Aissani
- Dept. of Life and Environmental Sciences; Univ. of Cagliari; Via Ospedale, 72 09124 Cagliari Italy
| | - Adriana Sanna
- Dept. of Public Health, Clinical and Molecular Medicine; Univ. of Cagliari; Italy Via Porcell 4 09124 Cagliari Italy
| | - Alessandra Ruggeri
- Dept. of Public Health, Clinical and Molecular Medicine; Univ. of Cagliari; Italy Via Porcell 4 09124 Cagliari Italy
| | - Sara Succa
- Dept. of Public Health, Clinical and Molecular Medicine; Univ. of Cagliari; Italy Via Porcell 4 09124 Cagliari Italy
| | - Barbara Meloni
- Dept. of Public Health, Clinical and Molecular Medicine; Univ. of Cagliari; Italy Via Porcell 4 09124 Cagliari Italy
| | - Antonella Pinna
- Dept. of Public Health, Clinical and Molecular Medicine; Univ. of Cagliari; Italy Via Porcell 4 09124 Cagliari Italy
| | - Clara Sanna
- Dept. of Public Health, Clinical and Molecular Medicine; Univ. of Cagliari; Italy Via Porcell 4 09124 Cagliari Italy
| |
Collapse
|
79
|
Ojima-Kato T, Hashimura D, Kojima T, Minabe S, Nakano H. In vitro generation of rabbit anti-Listeria monocytogenes monoclonal antibody using single cell based RT-PCR linked cell-free expression systems. J Immunol Methods 2015; 427:58-65. [DOI: 10.1016/j.jim.2015.10.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 10/03/2015] [Accepted: 10/05/2015] [Indexed: 01/14/2023]
|
80
|
Nyarko EB, Donnelly CW. Listeria monocytogenes: Strain Heterogeneity, Methods, and Challenges of Subtyping. J Food Sci 2015; 80:M2868-78. [PMID: 26588067 DOI: 10.1111/1750-3841.13133] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 10/02/2015] [Indexed: 12/28/2022]
Abstract
Listeria monocytogenes is a food-borne bacterial pathogen that is associated with 20% to 30% case fatality rate. L. monocytogenes is a genetically heterogeneous species, with a small fraction of strains (serotypes 1/2a, 1/2b, 4b) implicated in human listeriosis. Monitoring and source tracking of L. monocytogenes involve the use of subtyping methods, with the performance of genetic-based methods found to be superior to phenotypic-based ones. Various methods have been used to subtype L. monocytogenes isolates, with the pulsed-field gel electrophoresis (PFGE) being the gold standard. Although PFGE has had a massive impact on food safety through the establishment of the PulseNet, there is no doubt that whole genome sequence (WGS) typing is accurate, has a discriminatory power superior to any known method, and allows genome-wide differences between strains to be quantified through the comparison of nucleotide sequences. This review focuses on the different techniques that have been used to type L. monocytogenes strains, their performance challenges, and the tremendous impact WGS typing could have on the food safety landscape.
Collapse
Affiliation(s)
- Esmond B Nyarko
- Dept. of Animal and Food Science, Univ. of Delaware, 044 Townsend Hall, 531 S. College Avenue, Newark, Del., 19716, U.S.A
| | - Catherine W Donnelly
- Dept. of Nutrition and Food Science, Univ. of Vermont, 109 Carrigan Drive, 256 Carrigan Wing, Burlington, Vt., 05405, U.S.A
| |
Collapse
|
81
|
Law JWF, Ab Mutalib NS, Chan KG, Lee LH. An insight into the isolation, enumeration, and molecular detection of Listeria monocytogenes in food. Front Microbiol 2015; 6:1227. [PMID: 26579116 PMCID: PMC4630303 DOI: 10.3389/fmicb.2015.01227] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 10/20/2015] [Indexed: 12/23/2022] Open
Abstract
Listeria monocytogenes, a foodborne pathogen that can cause listeriosis through the consumption of food contaminated with this pathogen. The ability of L. monocytogenes to survive in extreme conditions and cause food contaminations have become a major concern. Hence, routine microbiological food testing is necessary to prevent food contamination and outbreaks of foodborne illness. This review provides insight into the methods for cultural detection, enumeration, and molecular identification of L. monocytogenes in various food samples. There are a number of enrichment and plating media that can be used for the isolation of L. monocytogenes from food samples. Enrichment media such as buffered Listeria enrichment broth, Fraser broth, and University of Vermont Medium (UVM) Listeria enrichment broth are recommended by regulatory agencies such as Food and Drug Administration-bacteriological and analytical method (FDA-BAM), US Department of Agriculture-Food and Safety (USDA-FSIS), and International Organization for Standardization (ISO). Many plating media are available for the isolation of L. monocytogenes, for instance, polymyxin acriflavin lithium-chloride ceftazidime aesculin mannitol, Oxford, and other chromogenic media. Besides, reference methods like FDA-BAM, ISO 11290 method, and USDA-FSIS method are usually applied for the cultural detection or enumeration of L. monocytogenes. most probable number technique is applied for the enumeration of L. monocytogenes in the case of low level contamination. Molecular methods including polymerase chain reaction, multiplex polymerase chain reaction, real-time/quantitative polymerase chain reaction, nucleic acid sequence-based amplification, loop-mediated isothermal amplification, DNA microarray, and next generation sequencing technology for the detection and identification of L. monocytogenes are discussed in this review. Overall, molecular methods are rapid, sensitive, specific, time- and labor-saving. In future, there are chances for the development of new techniques for the detection and identification of foodborne with improved features.
Collapse
Affiliation(s)
- Jodi Woan-Fei Law
- Biomedical Research Laboratory, Jeffrey Cheah School of Medicine and Health Sciences, Monash UniversityBandar Sunway, Malaysia
| | | | - Kok-Gan Chan
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of MalayaKuala Lumpur, Malaysia
| | - Learn-Han Lee
- Biomedical Research Laboratory, Jeffrey Cheah School of Medicine and Health Sciences, Monash UniversityBandar Sunway, Malaysia
| |
Collapse
|
82
|
Wijetunge DSS, Gongati S, DebRoy C, Kim KS, Couraud PO, Romero IA, Weksler B, Kariyawasam S. Characterizing the pathotype of neonatal meningitis causing Escherichia coli (NMEC). BMC Microbiol 2015; 15:211. [PMID: 26467858 PMCID: PMC4606507 DOI: 10.1186/s12866-015-0547-9] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 10/02/2015] [Indexed: 11/26/2022] Open
Abstract
Background Neonatal meningitis-causing Escherichia coli (NMEC) is the predominant Gram-negative bacterial pathogen associated with meningitis in newborn infants. High levels of heterogeneity and diversity have been observed in the repertoire of virulence traits and other characteristics among strains of NMEC making it difficult to define the NMEC pathotype. The objective of the present study was to identify genotypic and phenotypic characteristics of NMEC that can be used to distinguish them from commensal E. coli. Methods A total of 53 isolates of NMEC obtained from neonates with meningitis and 48 isolates of fecal E. coli obtained from healthy individuals (HFEC) were comparatively evaluated using five phenotypic (serotyping, serum bactericidal assay, biofilm assay, antimicorbial susceptibility testing, and in vitro cell invasion assay) and three genotypic (phylogrouping, virulence genotyping, and pulsed-field gel electrophoresis) methods. Results A majority (67.92 %) of NMEC belonged to B2 phylogenetic group whereas 59 % of HFEC belonged to groups A and D. Serotyping revealed that the most common O and H types present in NMEC tested were O1 (15 %), O8 (11.3 %), O18 (13.2 %), and H7 (25.3 %). In contrast, none of the HFEC tested belonged to O1 or O18 serogroups. The most common serogroup identified in HFEC was O8 (6.25 %). The virulence genotyping reflected that more than 70 % of NMEC carried kpsII, K1, neuC, iucC, sitA, and vat genes with only less than 27 % of HFEC possessing these genes. All NMEC and 79 % of HFEC tested were able to invade human cerebral microvascular endothelial cells. No statistically significant difference was observed in the serum resistance phenotype between NMEC and HFEC. The NMEC strains demonstrated a greater ability to form biofilms in Luria Bertani broth medium than did HFEC (79.2 % vs 39.9 %). Conclusion The results of our study demonstrated that virulence genotyping and phylogrouping may assist in defining the potential NMEC pathotype. Electronic supplementary material The online version of this article (doi:10.1186/s12866-015-0547-9) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- D S S Wijetunge
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University, 115 Henning Bldg, University Park, Pennsylvania, USA.
| | - S Gongati
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University, 115 Henning Bldg, University Park, Pennsylvania, USA.
| | - C DebRoy
- E. coli Reference Center, Department of Veterinary and Biomedical Sciences, Pennsylvania State University, University Park, Pennsylvania, USA.
| | - K S Kim
- Division of Pediatric Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
| | - P O Couraud
- Department of Cell Biology, University of Paris Descartes, Paris, France.
| | - I A Romero
- Department of Biological Sciences, Open University, Milton Keynes, UK.
| | - B Weksler
- Department of Medicine, Weill Cornell Medical College in New York, New York, USA.
| | - S Kariyawasam
- Department of Veterinary and Biomedical Sciences, Pennsylvania State University, 115 Henning Bldg, University Park, Pennsylvania, USA. .,Center for Molecular Immunology and Infectious Disease, Pennsylvania State University, University Park, Pennsylvania, USA.
| |
Collapse
|
83
|
Ariza-Miguel J, Fernández-Natal MI, Soriano F, Hernández M, Stessl B, Rodríguez-Lázaro D. Molecular Epidemiology of Invasive Listeriosis due to Listeria monocytogenes in a Spanish Hospital over a Nine-Year Study Period, 2006-2014. BIOMED RESEARCH INTERNATIONAL 2015; 2015:191409. [PMID: 26539467 PMCID: PMC4619764 DOI: 10.1155/2015/191409] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2015] [Revised: 06/23/2015] [Accepted: 07/01/2015] [Indexed: 02/04/2023]
Abstract
We investigated the pathogenicity, invasiveness, and genetic relatedness of 17 clinical Listeria monocytogenes stains isolated over a period of nine years (2006-2014). All isolates were phenotypically characterised and growth patterns were determined. The antimicrobial susceptibility of L. monocytogenes isolates was determined in E-tests. Invasion assays were performed with epithelial HeLa cells. Finally, L. monocytogenes isolates were subtyped by PFGE and MLST. All isolates had similar phenotypic characteristics (β-haemolysis and lecithinase activity), and three types of growth curve were observed. Bacterial recovery rates after invasion assays ranged from 0.09% to 7.26% (1.62 ± 0.46). MLST identified 11 sequence types (STs), and 14 PFGE profiles were obtained, indicating a high degree of genetic diversity. Genetic studies unequivocally revealed the occurrence of one outbreak of listeriosis in humans that had not previously been reported. This outbreak occurred in October 2009 and affected three patients from neighbouring towns. In conclusion, the molecular epidemiological analysis clearly revealed a cluster (three human cases, all ST1) of not previously reported listeriosis cases in northwestern Spain. Our findings indicate that molecular subtyping, in combination with epidemiological case analysis, is essential and should be implemented in routine diagnosis, to improve the tracing of the sources of outbreaks.
Collapse
Affiliation(s)
| | - María Isabel Fernández-Natal
- Department of Clinical Microbiology, Complejo Asistencial Universitario de León, León, Spain
- Institute of Biomedicine (IBIOMED), University of León, León, Spain
| | | | - Marta Hernández
- Instituto Tecnológico Agrario de Castilla y León, Valladolid, Spain
| | - Beatrix Stessl
- Institute of Milk Hygiene, Milk Technology and Food Science, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine, Vienna, Austria
| | - David Rodríguez-Lázaro
- Instituto Tecnológico Agrario de Castilla y León, Valladolid, Spain
- Microbiology Section, Department of Biotechnology and Food Science, Faculty of Sciences, University of Burgos, Burgos, Spain
| |
Collapse
|
84
|
Novel PCR Assays Complement Laser Biosensor-Based Method and Facilitate Listeria Species Detection from Food. SENSORS 2015; 15:22672-91. [PMID: 26371000 PMCID: PMC4610479 DOI: 10.3390/s150922672] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 09/01/2015] [Indexed: 11/17/2022]
Abstract
The goal of this study was to develop the Listeria species-specific PCR assays based on a house-keeping gene (lmo1634) encoding alcohol acetaldehyde dehydrogenase (Aad), previously designated as Listeria adhesion protein (LAP), and compare results with a label-free light scattering sensor, BARDOT (bacterial rapid detection using optical scattering technology). PCR primer sets targeting the lap genes from the species of Listeria sensu stricto were designed and tested with 47 Listeria and 8 non-Listeria strains. The resulting PCR primer sets detected either all species of Listeria sensu stricto or individual L. innocua, L. ivanovii and L. seeligeri, L. welshimeri, and L. marthii without producing any amplified products from other bacteria tested. The PCR assays with Listeria sensu stricto-specific primers also successfully detected all species of Listeria sensu stricto and/or Listeria innocua from mixed culture-inoculated food samples, and each bacterium in food was verified by using the light scattering sensor that generated unique scatter signature for each species of Listeria tested. The PCR assays based on the house-keeping gene aad (lap) can be used for detection of either all species of Listeria sensu stricto or certain individual Listeria species in a mixture from food with a detection limit of about 10⁴ CFU/mL.
Collapse
|
85
|
Kalia VC, Kumar P, Kumar R, Mishra A, Koul S. Genome Wide Analysis for Rapid Identification of Vibrio Species. Indian J Microbiol 2015; 55:375-83. [PMID: 26543262 DOI: 10.1007/s12088-015-0553-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 09/01/2015] [Indexed: 12/17/2022] Open
Abstract
The highly conserved 16S rRNA (rrs) gene is generally used for bacterial identification. In organisms possessing multiple copies of rrs, high intra-genomic heterogeneity does not allow easy distinction among different species. In order to identify Vibrio species, a wide range of genes have been employed. There is an urgent requirement of a consensus gene, which can be used as biomarker for rapid identification. Eight sequenced genomes of Vibrio species were screened for selecting genes which were common among all the genomes. Out of 108 common genes, 24 genes of sizes varying from 0.11 to 3.94 kb were subjected to in silico digestion with 10 type II restriction endonucleases (RE). A few unique genes-dapF, fadA, hisD, ilvH, lpxC, recF, recR, rph and ruvB in combination with certain REs provided unique digestion patterns, which can be used as biomarkers. This protocol can be exploited for rapid diagnosis of Vibrio species.
Collapse
Affiliation(s)
- Vipin Chandra Kalia
- Microbial Biotechnology and Genomics, CSIR - Institute of Genomics and Integrative Biology (IGIB), Delhi University Campus, Mall Road, New Delhi, 110007 India ; Academy of Scientific and Innovative Research (AcSIR), 2, Rafi Marg, Anusandhan Bhawan, New Delhi, 110001 India
| | - Prasun Kumar
- Microbial Biotechnology and Genomics, CSIR - Institute of Genomics and Integrative Biology (IGIB), Delhi University Campus, Mall Road, New Delhi, 110007 India
| | - Ravi Kumar
- Microbial Biotechnology and Genomics, CSIR - Institute of Genomics and Integrative Biology (IGIB), Delhi University Campus, Mall Road, New Delhi, 110007 India
| | - Anjali Mishra
- Microbial Biotechnology and Genomics, CSIR - Institute of Genomics and Integrative Biology (IGIB), Delhi University Campus, Mall Road, New Delhi, 110007 India
| | - Shikha Koul
- Microbial Biotechnology and Genomics, CSIR - Institute of Genomics and Integrative Biology (IGIB), Delhi University Campus, Mall Road, New Delhi, 110007 India ; Academy of Scientific and Innovative Research (AcSIR), 2, Rafi Marg, Anusandhan Bhawan, New Delhi, 110001 India
| |
Collapse
|
86
|
Doijad S, Weigel M, Barbuddhe S, Blom J, Goesmann A, Hain T, Chakraborty T. Phylogenomic grouping of Listeria monocytogenes. Can J Microbiol 2015; 61:637-46. [DOI: 10.1139/cjm-2015-0281] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The precise delineation of lineages and clonal groups are a prerequisite to examine within-species genetic variations, particularly with respect to pathogenic potential. A whole-genome-based approach was used to subtype and subgroup isolates of Listeria monocytogenes. Core-genome typing was performed, employing 3 different approaches: total core genes (CG), high-scoring segment pairs (HSPs), and average nucleotide identity (ANI). Examination of 113 L. monocytogenes genomes available in-house and in public domains revealed 33 phylogenomic groups (PGs). Each PG could be differentiated into a number of genomic types (GTs), depending on the approach used: HSPs (n = 57 GTs), CG (n = 71 GTs), and ANI (n = 83 GTs). Demarcation of the PGs was concordant with the 4 known lineages and led to the identification of sublineages in the lineage groups I, II, and III. In addition, PG assignments had discriminatory power similar to multi-virulence-locus sequence typing types and clonal complexes of multilocus sequence typing. Clustering of genomically highly similar isolates from different countries, sources, and isolation dates using whole-genome-based PG suggested that dispersion of phylogenomic clones of L. monocytogenes preceded their subsequent evolution. Classification according to PG may act as a guideline for future epidemiological studies.
Collapse
Affiliation(s)
- Swapnil Doijad
- Institute of Medical Microbiology, Justus Liebig University and German Center for Infection Research (DZIF), Partner site Giessen-Marburg-Langen, Giessen, Germany 35392
| | - Markus Weigel
- Institute of Medical Microbiology, Justus Liebig University and German Center for Infection Research (DZIF), Partner site Giessen-Marburg-Langen, Giessen, Germany 35392
| | - Sukhadeo Barbuddhe
- National Institute of Biotic Stress Management, Raipur, Chhattisgarh, India
| | - Jochen Blom
- Bioinformatics and Systems Biology, Justus Liebig University, Giessen, Germany 35392
| | - Alexander Goesmann
- Bioinformatics and Systems Biology, Justus Liebig University, Giessen, Germany 35392
| | - Torsten Hain
- Institute of Medical Microbiology, Justus Liebig University and German Center for Infection Research (DZIF), Partner site Giessen-Marburg-Langen, Giessen, Germany 35392
| | - Trinad Chakraborty
- Institute of Medical Microbiology, Justus Liebig University and German Center for Infection Research (DZIF), Partner site Giessen-Marburg-Langen, Giessen, Germany 35392
| |
Collapse
|
87
|
Guldimann C, Bärtschi M, Frey J, Zurbriggen A, Seuberlich T, Oevermann A. Increased spread and replication efficiency of Listeria monocytogenes in organotypic brain-slices is related to multilocus variable number of tandem repeat analysis (MLVA) complex. BMC Microbiol 2015; 15:134. [PMID: 26138984 PMCID: PMC4490720 DOI: 10.1186/s12866-015-0454-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 05/28/2015] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Listeria (L.) monocytogenes causes fatal infections in many species including ruminants and humans. In ruminants, rhombencephalitis is the most prevalent form of listeriosis. Using multilocus variable number tandem repeat analysis (MLVA) we recently showed that L. monocytogenes isolates from ruminant rhombencephalitis cases are distributed over three genetic complexes (designated A, B and C). However, the majority of rhombencephalitis strains and virtually all those isolated from cattle cluster in MLVA complex A, indicating that strains of this complex may have increased neurotropism and neurovirulence. The aim of this study was to investigate whether ruminant rhombencephalitis strains have an increased ability to propagate in the bovine hippocampal brain-slice model and can be discriminated from strains of other sources. For this study, forty-seven strains were selected and assayed on brain-slice cultures, a bovine macrophage cell line (BoMac) and a human colorectal adenocarcinoma cell line (Caco-2). They were isolated from ruminant rhombencephalitis cases (n = 21) and other sources including the environment, food, human neurolisteriosis cases and ruminant/human non-encephalitic infection cases (n = 26). RESULTS All but one L. monocytogenes strain replicated in brain slices, irrespectively of the source of the isolate or MLVA complex. The replication of strains from MLVA complex A was increased in hippocampal brain-slice cultures compared to complex C. Immunofluorescence revealed that microglia are the main target cells for L. monocytogenes and that strains from MLVA complex A caused larger infection foci than strains from MLVA complex C. Additionally, they caused larger plaques in BoMac cells, but not CaCo-2 cells. CONCLUSIONS Our brain slice model data shows that all L. monocytogenes strains should be considered potentially neurovirulent. Secondly, encephalitis strains cannot be conclusively discriminated from non-encephalitis strains with the bovine organotypic brain slice model. The data indicates that MLVA complex A strains are particularly adept at establishing encephalitis possibly by virtue of their higher resistance to antibacterial defense mechanisms in microglia cells, the main target of L. monocytogenes.
Collapse
Affiliation(s)
- Claudia Guldimann
- Division of Neurological Sciences, Neurocenter, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
- Graduate school for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland.
| | - Michelle Bärtschi
- Division of Neurological Sciences, Neurocenter, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - Joachim Frey
- Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - Andreas Zurbriggen
- Division of Neurological Sciences, Neurocenter, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - Torsten Seuberlich
- Division of Neurological Sciences, Neurocenter, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| | - Anna Oevermann
- Division of Neurological Sciences, Neurocenter, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
| |
Collapse
|
88
|
Defining and Evaluating a Core Genome Multilocus Sequence Typing Scheme for Whole-Genome Sequence-Based Typing of Listeria monocytogenes. J Clin Microbiol 2015; 53:2869-76. [PMID: 26135865 PMCID: PMC4540939 DOI: 10.1128/jcm.01193-15] [Citation(s) in RCA: 202] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 06/13/2015] [Indexed: 11/20/2022] Open
Abstract
Whole-genome sequencing (WGS) has emerged today as an ultimate typing tool to characterize Listeria monocytogenes outbreaks. However, data analysis and interlaboratory comparability of WGS data are still challenging for most public health laboratories. Therefore, we have developed and evaluated a new L. monocytogenes typing scheme based on genome-wide gene-by-gene comparisons (core genome multilocus the sequence typing [cgMLST]) to allow for a unique typing nomenclature. Initially, we determined the breadth of the L. monocytogenes population based on MLST data with a Bayesian approach. Based on the genome sequence data of representative isolates for the whole population, cgMLST target genes were defined and reappraised with 67 L. monocytogenes isolates from two outbreaks and serotype reference strains. The Bayesian population analysis generated five L. monocytogenes groups. Using all available NCBI RefSeq genomes (n = 36) and six additionally sequenced strains, all genetic groups were covered. Pairwise comparisons of these 42 genome sequences resulted in 1,701 cgMLST targets present in all 42 genomes with 100% overlap and ≥90% sequence similarity. Overall, ≥99.1% of the cgMLST targets were present in 67 outbreak and serotype reference strains, underlining the representativeness of the cgMLST scheme. Moreover, cgMLST enabled clustering of outbreak isolates with ≤10 alleles difference and unambiguous separation from unrelated outgroup isolates. In conclusion, the novel cgMLST scheme not only improves outbreak investigations but also enables, due to the availability of the automatically curated cgMLST nomenclature, interlaboratory exchange of data that are crucial, especially for rapid responses during transsectorial outbreaks.
Collapse
|
89
|
Nayak DN, Savalia CV, Kalyani IH, Kumar R, Kshirsagar DP. Isolation, identification, and characterization of Listeria spp. from various animal origin foods. Vet World 2015; 8:695-701. [PMID: 27065632 PMCID: PMC4825267 DOI: 10.14202/vetworld.2015.695-701] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 04/15/2015] [Accepted: 04/25/2015] [Indexed: 11/23/2022] Open
Abstract
AIM The present study was undertaken with the prime objective of isolating and identifying Listeria spp. from various foods of animal origin sold at retail market outlets in the city of Navsari, Gujarat. MATERIALS AND METHODS Total 200 samples comprising of milk, milk products, meat, and fish (50 each) collected aseptically from local market which were subjected first to pre-enrichment in half strength Fraser broth followed by enrichment in full strength Fraser broth and subsequent plating on PALCAM agar. The growth with the typical colony characteristics were further identified up to species level on the basis of their morphological and biochemical characteristics. Cultures identified as Listeria monocytogenes were further subjected to in vitro pathogenicity tests and detection of different virulence-associated genes viz. actA, hlyA, and iap using polymerase chain reaction. RESULTS Of the total 200 food samples of animal origin; 18 (9%) were found positive for Listeria spp. which were identified as Listeria seeligeri (6, 33.3%), Listeria innocua (5, 27.7%), Listeria welshimeri (4, 22.2%), and L. monocytogenes (3, 16.6%). The highest prevalence was observed in milk samples (8). Species wise, 6 isolates of L. seeligeri which included two each from cow milk, buffalo milk, and meat samples; 5 L. innocua isolates included four recovered from fish and one from meat sample; 4 L. welshimeri comprised of two isolates from ice cream and one each from buffalo milk and meat sample; and 3 isolates of L. monocytogenes recovered from milk (1 cow and 2 buffalo milk). All 3 L. monocytogenes isolates screened for the presence of virulence genes viz. actA, hlyA, and iap using the specific primers revealed the presence of all the genes suggesting the possibility of danger of foodborne listeriosis among raw milk consumers. CONCLUSION Listeria spp. was isolated from 9% (18/200) of the animal origin food samples viz.; milk, milk products, meat, and fish with the highest prevalence in the milk samples. L. monocytogenes was isolated from 3 milk samples only. L. seeligeri was the predominant species isolated followed by L. innocua, L. welshimeri, and L. monocytogenes in this study. L. monocytogenes were found to carry virulence genes like actA, hly A, and iap genes suggesting the pathogenic potential of these isolates.
Collapse
Affiliation(s)
- Deepti N. Nayak
- Department of Veterinary Public Health and Epidemiology, Vanbandhu College of Veterinary Science and Animal Husbandry, Navsari Agricultural University, Navsari - 396 450, Gujarat, India
| | - C. V. Savalia
- Department of Veterinary Public Health and Epidemiology, Vanbandhu College of Veterinary Science and Animal Husbandry, Navsari Agricultural University, Navsari - 396 450, Gujarat, India
| | - I. H. Kalyani
- Department of Veterinary Microbiology, Vanbandhu College of Veterinary Science and Animal Husbandry, Navsari Agricultural University, Navsari - 396 450, Gujarat, India
| | - Rajeev Kumar
- Department of Veterinary Public Health and Epidemiology, Vanbandhu College of Veterinary Science and Animal Husbandry, Navsari Agricultural University, Navsari - 396 450, Gujarat, India
| | - D. P. Kshirsagar
- Department of Veterinary Public Health and Epidemiology, Vanbandhu College of Veterinary Science and Animal Husbandry, Navsari Agricultural University, Navsari - 396 450, Gujarat, India
| |
Collapse
|
90
|
|
91
|
Effect of chitosan on spoilage bacteria, Escherichia coli and Listeria monocytogenes in cured chicken meat. Int J Biol Macromol 2015; 76:303-9. [DOI: 10.1016/j.ijbiomac.2015.02.033] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Revised: 02/23/2015] [Accepted: 02/23/2015] [Indexed: 11/23/2022]
|
92
|
Serotypes and Pulsotypes Diversity of Listeria monocytogenes in a Beef-Processing Environment. Foodborne Pathog Dis 2015; 12:323-6. [DOI: 10.1089/fpd.2014.1875] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
93
|
Salazar JK, Wang Y, Yu S, Wang H, Zhang W. Polymerase chain reaction-based serotyping of pathogenic bacteria in food. J Microbiol Methods 2015; 110:18-26. [DOI: 10.1016/j.mimet.2015.01.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 01/09/2015] [Accepted: 01/14/2015] [Indexed: 10/24/2022]
|
94
|
Genotypic analyses and virulence characterization of Listeria monocytogenes isolates from crayfish (Procambarus clarkii). Curr Microbiol 2015; 70:704-9. [PMID: 25586079 DOI: 10.1007/s00284-015-0778-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Accepted: 12/12/2014] [Indexed: 10/24/2022]
Abstract
Listeria monocytogenes is a foodborne pathogen that can cause invasive illness in humans and farm animals. It is frequently isolated from dairy products and poultry. However, there have been few literatures on the genetic diversity and virulence potential of L. monocytogenes from freshwater animal. Thirty-nine L. monocytogenes strains from crayfish were isolated and identified in this study. Molecular subtyping and polymorphism of each isolate were analyzed by multilocus sequence typing (MLST). MLST divided the isolates into eight sequence types (STs), six of which from crayfish were the same with the isolates from environment and clinic. PCR detection of the eight genes related to virulence and multiplex PCR for serotyping showed that the eight virulence factors were present in the isolates and all the isolates belonged to four major L. monocytogenes serotype groups (1/2a, 1/2b, 1/2c, and 4b) frequently isolated from patients. In vivo pathogenicity of isolates was also evaluated in murine model and survival curve of infected mice suggested that ST1, ST4, and ST9 isolates were as virulent as the reference strain EGDe. This study provides preliminary insights into the genetic diversity of L. monocytogenes from crayfish and the genetic correlation between crayfish and clinical L. monocytogenes isolates. The results indicate the contamination in aquaculture could be the source of Listeria contamination and the isolates are likely to cause human listeriosis.
Collapse
|
95
|
Spanu C, Scarano C, Ibba M, Spanu V, De Santis EPL. Occurrence and traceability of Listeria monocytogenes strains isolated from sheep's milk cheese-making plants environment. Food Control 2015. [DOI: 10.1016/j.foodcont.2014.07.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
96
|
Tonk M, Cabezas-Cruz A, Valdés JJ, Rego ROM, Chrudimská T, Strnad M, Šíma R, Bell-Sakyi L, Franta Z, Vilcinskas A, Grubhoffer L, Rahnamaeian M. Defensins from the tick Ixodes scapularis are effective against phytopathogenic fungi and the human bacterial pathogen Listeria grayi. Parasit Vectors 2014; 7:554. [PMID: 25443032 PMCID: PMC4269947 DOI: 10.1186/s13071-014-0554-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 11/21/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Ixodes scapularis is the most common tick species in North America and a vector of important pathogens that cause diseases in humans and animals including Lyme disease, anaplasmosis and babesiosis. Tick defensins have been identified as a new source of antimicrobial agents with putative medical applications due to their wide-ranging antimicrobial activities. Two multigene families of defensins were previously reported in I. scapularis. The objective of the present study was to characterise the potential antimicrobial activity of two defensins from I. scapularis with emphasis on human pathogenic bacterial strains and important phytopathogenic fungi. METHODS Scapularisin-3 and Scapularisin-6 mature peptides were chemically synthesised. In vitro antimicrobial assays were performed to test the activity of these two defensins against species of different bacterial genera including Gram-positive bacteria Staphylococcus aureus, Staphylococcus epidermidis, and Listeria spp. as well as Gram-negative bacteria Escherichia coli, Pseudomonas aeruginosa along with two plant-pathogenic fungi from the genus Fusarium. In addition, the tissue-specific expression patterns of Scapularisin-3 and Scapularisin-6 in I. scapularis midgut, salivary glands and embryo-derived cell lines were determined using PCR. Finally, tertiary structures of the two defensins were predicted and structural analyses were conducted. RESULTS Scapularisin-6 efficiently killed L. grayi, and both Scapularisin-3 and Scapularisin-6 caused strong inhibition (IC50 value: ~1 μM) of the germination of plant-pathogenic fungi Fusarium culmorum and Fusarium graminearum. Scapularisin-6 gene expression was observed in I. scapularis salivary glands and midgut. However, Scapularisin-3 gene expression was only detected in the salivary glands. Transcripts from the two defensins were not found in the I. scapularis tick cell lines ISE6 and ISE18. CONCLUSION Our results have two main implications. Firstly, the anti-Listeria and antifungal activities of Scapularisin-3 and Scapularisin-6 suggest that these peptides may be useful for (i) treatment of antibiotic-resistant L. grayi in humans and (ii) plant protection. Secondly, the antimicrobial properties of the two defensins described in this study may pave the way for further studies regarding pathogen invasion and innate immunity in I. scapularis.
Collapse
Affiliation(s)
- Miray Tonk
- Biology Centre of the AS CR, Institute of Parasitology, Branišovská 31, 37005, České Budějovice, Czech Republic. .,Faculty of Science, University of South Bohemia, Branišovská 31, 37005, České Budějovice, Czech Republic.
| | - Alejandro Cabezas-Cruz
- SaBio. Instituto de Investigación en Recursos Cinegéticos IREC, CSIC-UCLM-JCCM, Ronda de Toledo s/n, 13005, Ciudad Real, Spain. .,Center for Infection and Immunity of Lille (CIIL), INSERM U1019 - CNRS UMR 8204, Université Lille Nord de France, Institut Pasteur de Lille, Lille, France.
| | - James J Valdés
- Biology Centre of the AS CR, Institute of Parasitology, Branišovská 31, 37005, České Budějovice, Czech Republic.
| | - Ryan O M Rego
- Biology Centre of the AS CR, Institute of Parasitology, Branišovská 31, 37005, České Budějovice, Czech Republic.
| | - Tereza Chrudimská
- Biology Centre of the AS CR, Institute of Parasitology, Branišovská 31, 37005, České Budějovice, Czech Republic. .,Faculty of Science, University of South Bohemia, Branišovská 31, 37005, České Budějovice, Czech Republic.
| | - Martin Strnad
- Biology Centre of the AS CR, Institute of Parasitology, Branišovská 31, 37005, České Budějovice, Czech Republic. .,Faculty of Science, University of South Bohemia, Branišovská 31, 37005, České Budějovice, Czech Republic.
| | - Radek Šíma
- Biology Centre of the AS CR, Institute of Parasitology, Branišovská 31, 37005, České Budějovice, Czech Republic.
| | | | - Zdeněk Franta
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Department of Bioresources, Winchester Strasse, D-35394, Giessen, Germany.
| | - Andreas Vilcinskas
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Department of Bioresources, Winchester Strasse, D-35394, Giessen, Germany. .,Institute for Phytopathology and Applied Zoology, Justus-Liebig-University of Giessen, Heinrich-Buff-Ring 26-32, D-35392, Giessen, Germany.
| | - Libor Grubhoffer
- Biology Centre of the AS CR, Institute of Parasitology, Branišovská 31, 37005, České Budějovice, Czech Republic. .,Faculty of Science, University of South Bohemia, Branišovská 31, 37005, České Budějovice, Czech Republic.
| | - Mohammad Rahnamaeian
- Fraunhofer Institute for Molecular Biology and Applied Ecology, Department of Bioresources, Winchester Strasse, D-35394, Giessen, Germany. .,Institute for Phytopathology and Applied Zoology, Justus-Liebig-University of Giessen, Heinrich-Buff-Ring 26-32, D-35392, Giessen, Germany.
| |
Collapse
|
97
|
Gao H, Liu C. Biochemical and morphological alteration of Listeria monocytogenes under environmental stress caused by chloramine-T and sodium hypochlorite. Food Control 2014. [DOI: 10.1016/j.foodcont.2014.05.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
98
|
Genotypic characterization and antimicrobial resistance of Listeria monocytogenes from ready-to-eat foods. Food Control 2014. [DOI: 10.1016/j.foodcont.2014.03.038] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
99
|
Masuku S, Babu D, Martin E, O'Bryan C, Crandall P, Ricke S. Lethality of moist heat and silver dihydrogen citrate sanitizer combinations on Listeria spp. adhered to components of a deli meat slicer. Food Control 2014. [DOI: 10.1016/j.foodcont.2014.03.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
100
|
Wang J, Qiu J, Tan W, Zhang Y, Wang H, Zhou X, Liu S, Feng H, Li W, Niu X, Deng X. Fisetin inhibits Listeria monocytogenes virulence by interfering with the oligomerization of listeriolysin O. J Infect Dis 2014; 211:1376-87. [PMID: 25231018 DOI: 10.1093/infdis/jiu520] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Accepted: 08/04/2014] [Indexed: 11/14/2022] Open
Abstract
Listeriolysin O (LLO), an essential virulence determinant of Listeria monocytogenes, is a pore-forming toxin whose primary function is to facilitate cytosolic bacterial replication by breaching the phagosomal membranes, which is critical for the pathogen to evade host immune recognition. The critical role of LLO in the virulence of L. monocytogenes renders it an ideal target for designing novel antivirulence therapeutics. We found that fisetin, a natural flavonoid without antimicrobial activity, is a potent antagonist of LLO-mediated hemolysis. Fisetin effectively inhibits L. monocytogenes infection in both tissue culture and animal infection models. Molecular modeling and mutational analysis revealed that fisetin directly engages loop 2 and loop 3 of LLO, leading to the blockage of cholesterol binding and the reduction of its oligomerization, thus inhibiting its hemolytic activity. Our results establish fisetin as an effective antitoxin agent for LLO, which can be further developed into novel therapeutics against infections caused by L. monocytogenes.
Collapse
Affiliation(s)
- Jianfeng Wang
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine
| | - Jiazhang Qiu
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine
| | - Wei Tan
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine
| | - Yu Zhang
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine
| | - Hongshu Wang
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine
| | - Xuan Zhou
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine
| | - Shui Liu
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine
| | - Haihua Feng
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine
| | - Wenhua Li
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine
| | - Xiaodi Niu
- Department of Food Quality and Safety, Jilin University, Changchun, China
| | - Xuming Deng
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine
| |
Collapse
|