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Yan Y, Cao M, Ma J, Suo J, Bai X, Ge W, Lv X, Zhang Q, Chen J, Cui S, Yang B. Use of proteomics to elucidate characteristics of Cronobacter sakazakii under mild heat stress. Int J Food Microbiol 2024; 425:110885. [PMID: 39178661 DOI: 10.1016/j.ijfoodmicro.2024.110885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Revised: 08/13/2024] [Accepted: 08/17/2024] [Indexed: 08/26/2024]
Abstract
Cronobacter sakazakii is an opportunistic pathogen known for causing severe diseases. Mild heat treatment is commonly used in food processing, however, the pathogenic characteristics and underlying mechanisms of Cronobacter sakazakii strains remain poorly understood. In this study, we found that mild heat stress (MHS) at 52 °C can induce several deleterious effects in Cronobacter sakazakii, including damage to the cell wall, genomic DNA breakage, and misfolding of cytoplasmic proteins. These conditions lead to a decreased survival ability under acid, desiccation, and osmotic stress; a reduction in biofilm formation; and diminished motility. Notably, surviving C. sakazakii cells retain their pathogenicity, causing significant intestinal damage in newborn mice. This damage is characterized by epithelial sloughing and disruption of the intestinal structure. Tandem mass tag (TMT)-based proteomics identified 736 proteins with differential abundance across C. sakazakii strains subjected to mild heat stress, highlighting adaptations in biofilm formation, motility, and stress tolerance. Key regulatory changes were observed in phospholipid metabolism and protein synthesis, which underpin this complex stress response. This data illustrates a sophisticated balance between environmental adaptability and pathogenic potential. The metabolic and pathogenic responses of C. sakazakii to mild heat stress are closely linked to its phospholipid metabolism and the production of secretory proteins, both crucial for its virulence and reliant on membrane transport. This complex interplay emphasizes the need to understand these mechanisms to develop effective control strategies.
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Affiliation(s)
- Yanfei Yan
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Mengyuan Cao
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Jiaqi Ma
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Jia Suo
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Xiaobao Bai
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China
| | - Wupeng Ge
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; Shaanxi Engineering Research Centre of Dairy Products Quality, Safety and Health, Yangling, Shaanxi 712100, China
| | - Xin Lv
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; Shaanxi Engineering Research Centre of Dairy Products Quality, Safety and Health, Yangling, Shaanxi 712100, China
| | - Qiang Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; Shaanxi Engineering Research Centre of Dairy Products Quality, Safety and Health, Yangling, Shaanxi 712100, China.
| | - Jia Chen
- College of Chemical Technology, Shijiazhuang University, Shijiazhuang 050035, China.
| | - Shenghui Cui
- National Institutes for Food and Drug Control, Beijing 100050, China.
| | - Baowei Yang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; Shaanxi Engineering Research Centre of Dairy Products Quality, Safety and Health, Yangling, Shaanxi 712100, China.
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Xia RF, Wei YR, Zhang CQ, Huang Y, Chen MS, Yuan XY, Zha HJ, Lai KD, Xia X, Wan LS. Structurally diverse triterpenoids with antibacterial activities from Euphorbia humifusa. Bioorg Chem 2024; 153:107915. [PMID: 39471543 DOI: 10.1016/j.bioorg.2024.107915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2024] [Revised: 10/20/2024] [Accepted: 10/21/2024] [Indexed: 11/01/2024]
Abstract
An exploration of antibacterial components from the whole plant of Euphorbia humifusa led to the isolation of 14 new triterpenoids, euphohumifusoids A-N (1-7 and 9-15), as well as four known analogues (8 and 16-18). Their structures were elucidated by extensively analysis of the spectroscopic data and X-ray crystallography using Cu Kα radiation. Among them, euphohumifusoid A (1) bears an unique 6(7 → 8)abeo scaffold originated from a D:C-friedo-oleanane skeleton for the first time, euphohumifusoids H and I (9 and 10) possess a rare α,β-unsaturated-γ-lactone chain originated from 25,26,27-trinordammaranes, and euphohumifusoid L (13) is a highly modified 3,4-seco-25,26,27-trinorcycloartane. Notably, in antibacterial bioassay, compound 1 displayed excellent antibacterial activities against Bacillus cereus, Staphylococcus aureus, and S.epidermidis with MIC of 12.5, 25, and 25 μg/mL, comparable to the positive controls. Upon exposure to 1 and 2 MIC of 1, B.cereus underwent drastic morphological changes, resulting in complete disruption of the cells. Meanwhile, compound 1 also exhibited remarkable antibiofilm activity against B.cereus at 1 MIC and 2 MIC.
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Affiliation(s)
- Ru-Feng Xia
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Yu-Ru Wei
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, Hubei Normal University, Huangshi 435002, PR China
| | - Cheng-Qi Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Yan Huang
- Guangxi Key Laboratory of Traditional Chinese Medicine Quality Standards, Guangxi Institute of Chinese Medicine & Pharmaceutical Science, Nanning 530022, PR China
| | - Ming-Sheng Chen
- Guangxi Key Laboratory of Traditional Chinese Medicine Quality Standards, Guangxi Institute of Chinese Medicine & Pharmaceutical Science, Nanning 530022, PR China
| | - Xiao-Yu Yuan
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Hong-Jing Zha
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
| | - Ke-Dao Lai
- Guangxi Key Laboratory of Traditional Chinese Medicine Quality Standards, Guangxi Institute of Chinese Medicine & Pharmaceutical Science, Nanning 530022, PR China.
| | - Xian Xia
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, Hubei Normal University, Huangshi 435002, PR China.
| | - Luo-Sheng Wan
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China.
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Chantapakul B, Parreira VR, Farber JM. Effect of Bacterial Endophytes Isolated from Tropical Fruits against Listeria monocytogenes and Cronobacter sakazakii in Model Food Products. J Food Prot 2024; 87:100330. [PMID: 39025261 DOI: 10.1016/j.jfp.2024.100330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Revised: 07/02/2024] [Accepted: 07/12/2024] [Indexed: 07/20/2024]
Abstract
Listeria monocytogenes and Cronobacter sakazakii are two important foodborne bacterial pathogens. Bacterial endophytes, which reside in plant cells, can produce antimicrobial compounds to protect the host organism or inhibit pathogens. This study investigated the bacterial community of tropical fruits for their potential to inactivate L. monocytogenes or C. sakazakii in cantaloupe and liquid infant formula, respectively. Tropical fruits including papayas, dragon fruits, and sugar apples, were sourced from several countries. Candidate bacterial endophytes were recovered from these tropical fruits using blood agar and Reasoner's 2A (R2A) agar and tested for potential inhibition against L. monocytogenes and C. sakazakii. A total of 196 bacterial endophytes were recovered from papayas, dragon fruits, and sugar apples. Among these bacterial endophytes, 33 (16.8%) and 13 (6.6%) of them demonstrated an inhibition zone against L. monocytogenes and C. sakazakii, respectively. The inhibitory strains were identified using 16S rRNA sequencing as Bacillus spp., Enterobacter spp., Klebsiella spp., Microbacterium spp., Pantoea spp., and Pseudomonas spp. A cocktail of Pantoea spp. and Enterobacter spp. was used in challenge studies with cantaloupe and significantly reduced the number of L. monocytogenes by approximately 2.5 log10 CFU/g. In addition, P. stewartii demonstrated antagonistic activity against C. sakazakii in liquid infant formula, i.e., it significantly decreased the number of C. sakazakii by at least 1 log10 CFU/mL. Thus, the use of bacterial endophytes recovered from fruits and vegetables could be a promising area of research. Their use as potential biocontrol agents to control bacterial pathogens in ready-to-eat foods warrants further investigation.
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Affiliation(s)
- Bowornnan Chantapakul
- Canadian Research Institute for Food Safety, Department of Food Science, Ontario Agriculture College, University of Guelph, Ontario, Canada.
| | - Valeria R Parreira
- Canadian Research Institute for Food Safety, Department of Food Science, Ontario Agriculture College, University of Guelph, Ontario, Canada
| | - Jeffrey M Farber
- Canadian Research Institute for Food Safety, Department of Food Science, Ontario Agriculture College, University of Guelph, Ontario, Canada
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Samadpour M, Benoit L, Myoda S, Hans B, Nadala C, Kim SH, Themeli E, Cantera R, Nguyen T, Richter H. Microbiological survey and genomic analysis of Cronobacter sakazakii strains isolated from US households and retail foods. Appl Environ Microbiol 2024; 90:e0070024. [PMID: 38953659 PMCID: PMC11267904 DOI: 10.1128/aem.00700-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Accepted: 06/12/2024] [Indexed: 07/04/2024] Open
Abstract
Cronobacter species are opportunistic pathogens that are capable of causing morbidity and mortality, particularly in infants. Although the transmission dynamics involved in Cronobacter infections remain largely unknown, contaminated powdered infant formula (PIF) has been linked to 30% of Cronobacter sakazakii cases involving invasive illness in infants. As several lines of evidence have implicated the domestic environment in PIF contamination, we undertook a microbiological survey of homes (N = 263) across the US. Cronobacter spp. and C. sakazakii were isolated from 36.1% and 24.7% of US homes, respectively, with higher recovery rates observed for floor and kitchen surfaces. Multi-locus sequence typing indicated that the dominant strain was C. sakazakii ST4, the sequence type most commonly associated with neonatal meningitis. For comparison purposes, retail foods (N = 4,009) were also surveyed, with the highest contamination frequencies (10.1%-26.3%) seen for nut products, seeds, and grains/baked goods/flours. The sequence type profile of isolates recovered from homes mirrored that of isolates recovered from retail foods, with increased representation of ST1, ST4, ST13, ST17, and ST40. Analysis of 386 whole genomic sequences revealed significant diversity. Redundancies were only observed for isolates recovered from within the same domicile, and there were no identical matches with sequences archived at the NCBI pathogen database. Genes coding for putative virulence and antibiotic resistance factors did not segregate with clinically significant sequence types. Collectively, these findings support the possibility that contamination events occurring within the home should not be overlooked as a contributor to community-onset Cronobacter infections. IMPORTANCE Cronobacter sakazakii is an opportunistic pathogen that can cause significant morbidity and mortality in neonates. Its transmission dynamics are poorly understood, though powered infant formula (PIF) is thought to be the major transmission vehicle. How the PIF becomes contaminated remains unknown. Our survey shows that roughly 1/4 of US homes are contaminated with Cronobacter sakazakii, particularly in the kitchen setting. Our analyses suggest that the domestic environment may contribute to contamination of PIF and provides insights into mitigating the risk of transmission.
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Affiliation(s)
- Mansour Samadpour
- IEH Laboratories and Consulting Group Inc., Lake Forest Park, Washington, USA
| | - Lora Benoit
- IEH Laboratories and Consulting Group Inc., Lake Forest Park, Washington, USA
| | - Sam Myoda
- IEH Laboratories and Consulting Group Inc., Lake Forest Park, Washington, USA
| | - Bada Hans
- IEH Laboratories and Consulting Group Inc., Lake Forest Park, Washington, USA
| | - Cesar Nadala
- IEH Laboratories and Consulting Group Inc., Lake Forest Park, Washington, USA
| | - Seong Hong Kim
- IEH Laboratories and Consulting Group Inc., Lake Forest Park, Washington, USA
| | - Eni Themeli
- IEH Laboratories and Consulting Group Inc., Lake Forest Park, Washington, USA
| | - Ruth Cantera
- IEH Laboratories and Consulting Group Inc., Lake Forest Park, Washington, USA
| | - Truyen Nguyen
- IEH Laboratories and Consulting Group Inc., Lake Forest Park, Washington, USA
| | - Hans Richter
- IEH Laboratories and Consulting Group Inc., Lake Forest Park, Washington, USA
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Imdad A, Sherwani R, Wall K. Pediatric Formulas: An Update. Pediatr Rev 2024; 45:394-405. [PMID: 38945989 DOI: 10.1542/pir.2023-006002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 01/30/2024] [Accepted: 02/06/2024] [Indexed: 07/02/2024]
Abstract
The recent shortage of pediatric formulas in the United States, caused by supply chain issues and contamination of formula products in 1 of the major manufacturing plants, led many families to seek an alternate formula for their children. The Food and Drug Administration (FDA) allowed import of infant formulas from selected European and non-European countries. The European infant formulas differ from those produced in the United States regarding the primary source of the formula, age category, mixing instructions, labeling requirements, and formula composition in terms of macronutrients and micronutrients. Although most European infant formulas are nutritionally adequate, pediatricians and families need to be aware of the differences between the European and FDA-regulated formulas for their correct use and preparation for infants and young children. Supplementation with cow milk is recommended for children beyond infancy, and older infant formulas are not recommended for otherwise healthy growing children. However, pediatric formulas have been used to support the nutrition needs of children with feeding difficulties, especially those dependent on tube feeding and with certain medical conditions. The FDA does not regulate the production of pediatric formulas beyond infant formula, and significant variations exist in their composition. The pediatric formulas are available as polymeric (intact), hydrolyzed, elemental, or food-based blenderized formulas. The plant-based nonformula (milk) drinks are being used increasingly for children. These products might not be nutritionally complete and should be avoided in infants and children dependent on liquid nutrition.
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Affiliation(s)
- Aamer Imdad
- Division of Gastroenterology, Hepatology, Pancreatology, and Nutrition, Department of Pediatrics, Stead Family Children's Hospital, University of Iowa, Iowa City, IA
| | - Rida Sherwani
- Department of Pediatrics, State University of New York Upstate Medical University, Syracuse, NY
| | - Kellie Wall
- Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, State University of New York Upstate Medical University, Syracuse, NY
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Dessartine MM, Kosta A, Doan T, Cascales É, Côté JP. Type 1 fimbriae-mediated collective protection against type 6 secretion system attacks. mBio 2024; 15:e0255323. [PMID: 38497656 PMCID: PMC11005336 DOI: 10.1128/mbio.02553-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 01/25/2024] [Indexed: 03/19/2024] Open
Abstract
Bacterial competition may rely on secretion systems such as the type 6 secretion system (T6SS), which punctures and releases toxic molecules into neighboring cells. To subsist, bacterial targets must counteract the threats posed by T6SS-positive competitors. In this study, we used a comprehensive genome-wide high-throughput screening approach to investigate the dynamics of interbacterial competition. Our primary goal was to identify deletion mutants within the well-characterized E. coli K-12 single-gene deletion library, the Keio collection, that demonstrated resistance to T6SS-mediated killing by the enteropathogenic bacterium Cronobacter malonaticus. We identified 49 potential mutants conferring resistance to T6SS and focused our interest on a deletion mutant (∆fimE) exhibiting enhanced expression of type 1 fimbriae. We demonstrated that the presence of type 1 fimbriae leads to the formation of microcolonies and thus protects against T6SS-mediated assaults. Collectively, our study demonstrated that adhesive structures such as type 1 fimbriae confer collective protective behavior against T6SS attacks.IMPORTANCEType 6 secretion systems (T6SS) are molecular weapons employed by gram-negative bacteria to eliminate neighboring microbes. T6SS plays a pivotal role as a virulence factor, enabling pathogenic gram-negative bacteria to compete with the established communities to colonize hosts and induce infections. Gaining a deeper understanding of bacterial interactions will allow the development of strategies to control the action of systems such as the T6SS that can manipulate bacterial communities. In this context, we demonstrate that bacteria targeted by T6SS attacks from the enteric pathogen Cronobacter malonaticus, which poses a significant threat to infants, can develop a collective protective mechanism centered on the production of type I fimbriae. These adhesive structures promote the aggregation of bacterial preys and the formation of microcolonies, which protect the cells from T6SS attacks.
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Affiliation(s)
- Margot Marie Dessartine
- Département de biologie, Faculté des sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Artemis Kosta
- Plateforme de microscopie, Institut de Microbiologie de la Méditerranée (IMM, FR3479), Aix-Marseille Univ, CNRS, Marseille, France
| | - Thierry Doan
- Laboratoire d'Ingénierie des Systèmes Macromoléculaires (LISM, UMR7255), Institut de Microbiologie de la Méditerranée, Aix Marseille Univ, CNRS, Marseille, France
| | - Éric Cascales
- Laboratoire d'Ingénierie des Systèmes Macromoléculaires (LISM, UMR7255), Institut de Microbiologie de la Méditerranée, Aix Marseille Univ, CNRS, Marseille, France
| | - Jean-Philippe Côté
- Département de biologie, Faculté des sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
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Kim HR, Joe C, Hwang ET, Gu MB, Kim BC. Group selective aptamers: Broad-spectrum recognition of target groups in Cronobacter species and implementation of electrochemical biosensors as receptors. Biosens Bioelectron 2024; 246:115843. [PMID: 38006700 DOI: 10.1016/j.bios.2023.115843] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 11/02/2023] [Accepted: 11/14/2023] [Indexed: 11/27/2023]
Abstract
Aptamers are a versatile class of receptors with a high affinity and selectivity for specific targets. Although their ability to recognize individual targets has been extensively studied, some scenarios require the development of receptors capable of identifying all target groups. This study investigated the use of aptamers to achieve the broad-spectrum recognition of groups instead of individual targets. Aptamers were screened for selectively distinct groups of Cronobacter species associated with foodborne diseases. Seven Cronobacter spp. were divided into Group A (C. sakazakii, C. malonaticus, C. turicensis, and C. muytjensii) and Group B (C. dublinensis, C. condimenti, and C. universalis). Aptamers with exclusive selectivity for each group were identified, allowing binding to the species within their designated group while excluding those from the other group. The screened aptamers demonstrated reliable affinity and specificity with dissociation constants ranging from 1.3 to 399.7 nM for Group A and 4.0-24.5 nM for Group B. These aptamers have also been successfully employed as receptors in an electrochemical biosensor platform, enabling the selective detection of each group based on the corresponding aptamer (limit of detection was 7.8 and 3.2 CFU for Group A and Group B, respectively). The electrochemical sensor effectively detected the extent of infection in each group in powdered infant formula samples. This study highlights the successful screening and application of group-selective aptamers as sensing receptors, emphasizing their potential for diverse applications in different fields such as food safety, environmental monitoring, and clinical diagnostics, where the selective biosensing of target groups is crucial.
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Affiliation(s)
- Hye Ri Kim
- Center for Sustainable Environment Research, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Cheulmin Joe
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea
| | - Ee Taek Hwang
- Department of Food Biotechnology, Dong-A University, Busan, Republic of Korea
| | - Man Bock Gu
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea.
| | - Byoung Chan Kim
- Center for Sustainable Environment Research, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea; Division of Energy and Environment Technology, KIST School, University of Science and Technology (UST), Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 02792, Republic of Korea.
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Wang Y, Ling N, Wang Y, Ou D, Liang Z, Li G, Zhao H, Ye Y. Effect of ferric ions on Cronobacter sakazakii growth, biofilm formation, and swarming motility. Int J Food Microbiol 2024; 408:110418. [PMID: 37857020 DOI: 10.1016/j.ijfoodmicro.2023.110418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 09/22/2023] [Accepted: 09/23/2023] [Indexed: 10/21/2023]
Abstract
Cronobacter sakazakii (C. sakazakii) is a common food-borne pathogen that induces meningitis, sepsis, and necrotizing enterocolitis, primarily in newborns and infants. Iron plays a pivotal role in the growth of cells and biofilm formation. However, the effects of hemin (ferric ion donor) on C. sakazakii cells are scarcely known. Here, we explored the effect of ferric ions on the growth of planktonic C. sakazakii, biofilm formation, and swarming motility by crystal violet staining (CVS), scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM), and swarming assay. Our study demonstrated that ferric ions facilitated the growth of planktonic C. sakazakii, while hemin at concentrations ranging from 50 to 800 μmol/L promoted biofilm formation and at concentrations between 50 and 200 μmol/L enhanced the swarming motility of C. sakazakii. Furthermore, high hemin concentrations (400-800 μmol/L) were found to reduce flagellar length, as confirmed by transmission electron microscopy (TEM). These findings indicated that ferric ions mediated the swarming motility of C. sakazakii by regulating flagellar assembly. Finally, transcriptomic analysis of C. sakazakii was performed at hemin concentrations of 0, 50, and 200 μmol/L, which revealed that several genes associated with iron transport and metabolism, and flagellar assembly were essential for the survival of C. sakazakii under hemin treatment. Our findings revealed the molecular basis of ferric ions on C. sakazakii growth and biofilm formation, thus providing a novel perspective for its prevention and control.
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Affiliation(s)
- Yang Wang
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230601, China
| | - Na Ling
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230601, China
| | - Yaping Wang
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230601, China
| | - Dexin Ou
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230601, China
| | - Zhao Liang
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230601, China
| | - Guoqing Li
- Institute of Horticulture Research, Anhui Academy of Agricultural Sciences, Hefei 230031, China
| | - Hongyuan Zhao
- Institute of Horticulture Research, Anhui Academy of Agricultural Sciences, Hefei 230031, China.
| | - Yingwang Ye
- School of Food and Biological Engineering, Hefei University of Technology, Hefei 230601, China.
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Ping L, Zhengyang Z, Mohan S, Ruihong W, Zhengang L, Wen L, Xuemeng J, Yue C, Xinjun D, Shuo W. Effects and molecular mechanism of sugar transporter ESA_RS15745 on desiccation resistance, motility, and biofilm formation of Cronobacter sakazakii. J Food Sci 2024; 89:581-595. [PMID: 38126106 DOI: 10.1111/1750-3841.16872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 11/05/2023] [Accepted: 11/21/2023] [Indexed: 12/23/2023]
Abstract
Cronobacter sakazakii, an important Gram-negative foodborne pathogen, can cause neonatal meningitis and sepsis with high rates of infection and death. Gene ESA_RS15745 encodes a sugar transporter protein, which is not only essential for osmotic pressure maintenance during bacterial growth and reproduction but also associated with their desiccation tolerance, motility, and biofilm formation. Here, a mutant strain of ESA_RS15745 (ΔESA_RS15745) and the complementation strain (cpESA_RS15745) were constructed using a suicide vector knockout and gene complementation. ΔESA_RS15745 was found to have a decrease in its ability to transport maltose and trehalose and resist desiccation, whereas an increase in the ability of motility and biofilm formation, implying that ESA_RS15745 may positively regulate sugar transport and desiccation tolerance and negatively regulate motility and biofilm formation. To further investigate the molecular mechanisms underlying the function of related genes, RNA-seq was performed to explore the differentially expressed genes in the mutants. RNA-seq results showed the upregulation of 114 genes (mainly including those regulating chemotaxis and flagellar motility) and the downregulation of 22 genes (mainly including those regulating sugar transport). qRT-PCR analysis supported the RNA-seq results and showed that ESA_RS15745 may influence the dehydration tolerance though decreasing the intracellular trehalose content and negatively regulate the motility though the chemotactic signaling pathway. In addition, the biofilm formation of C. sakazakii should also be speculated to negatively regulate by ESA_RS15745 by consuming the extracellular carbohydrates concentration and then downregulating the intracellular cyclic diguanosine monophosphate. This study offers a reference for comprehending the molecular mechanism of gene ESA_RS15745 in C. sakazakii.
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Affiliation(s)
- Li Ping
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, China
| | - Zhang Zhengyang
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, China
| | - Si Mohan
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, China
| | - Wang Ruihong
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, China
| | - Li Zhengang
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, China
| | - Lv Wen
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, China
| | - Ji Xuemeng
- Tianjin Key Laboratory of Food Science and Health, College of Medicine, Nankai University, Tianjin, China
| | - Cheng Yue
- School of Science, Tianjin University, Tianjin, China
| | - Du Xinjun
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, China
| | - Wang Shuo
- State Key Laboratory of Food Nutrition and Safety, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, China
- Tianjin Key Laboratory of Food Science and Health, College of Medicine, Nankai University, Tianjin, China
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10
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Cao B, Gao J, Zhang Q, Xu X, Zhao R, Li H, Wei B. Melatonin supplementation protects against traumatic colon injury by regulating SERPINA3N protein expression. IMETA 2023; 2:e141. [PMID: 38868216 PMCID: PMC10989984 DOI: 10.1002/imt2.141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 09/25/2023] [Indexed: 06/14/2024]
Abstract
Traumatic colon injury (TCI) is a typical injury with high mortality. Prolongation of the intervention time window is a potentially useful approach to improving the outcomes of TCI casualties. This study aimed to identify the pathological mechanisms of TCI and to develop effective strategies to extend the survival time. A semicircular incision was made to prepare a TCI model using C57BL/6 mice. An overview of microbiota dysregulation was achieved by metagenome sequencing. Protein expression reprogramming in the intestinal epithelium was investigated using proteomics profiling. The mice that were subjected to TCI died within a short period of time when not treated. Gut symbiosis showed abrupt turbulence, and specific pathogenic bacteria rapidly proliferated. The protein expression in the intestinal epithelium was also reprogrammed. Among the differentially expressed proteins, SERPINA3N was overexpressed after TCI modeling. Deletion of Serpina3n prolonged the posttraumatic survival time of mice with TCI by improving gut homeostasis in vivo. To promote the translational application of this research, the effects of melatonin (MLT), an oral inhibitor of the SERPINA3N protein, were further investigated. MLT effectively downregulated SERPINA3N expression and mitigated TCI-induced death by suppressing the NF-κB signaling pathway. Our findings prove that preventive administration of MLT serves as an effective regimen to prolong the posttraumatic survival time by restoring gut homeostasis perturbed by TCI. It may become a novel strategy for improving the prognosis of patients suffering from TCI.
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Affiliation(s)
- Bo Cao
- Department of General Surgery, First Medical CenterChinese PLA General HospitalBeijingChina
| | - Jing‐Wang Gao
- Department of General Surgery, First Medical CenterChinese PLA General HospitalBeijingChina
- Medical School of Chinese PLABeijingChina
| | - Qing‐Peng Zhang
- Department of General Surgery, First Medical CenterChinese PLA General HospitalBeijingChina
| | - Xing‐Ming Xu
- Department of General Surgery, First Medical CenterChinese PLA General HospitalBeijingChina
| | - Rui‐Yang Zhao
- Department of General Surgery, First Medical CenterChinese PLA General HospitalBeijingChina
- Medical School of Chinese PLABeijingChina
| | - Hang‐Hang Li
- Department of General Surgery, First Medical CenterChinese PLA General HospitalBeijingChina
- Medical School of Chinese PLABeijingChina
| | - Bo Wei
- Department of General Surgery, First Medical CenterChinese PLA General HospitalBeijingChina
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11
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Bălbărău A, Ivanescu LM, Martinescu G, Rîmbu CM, Acatrinei D, Lazar M, Cocean I, Gurlui S, Cocean A, Miron L. Septicemic Outbreak in A Rainbow Trout Intensive Aquaculture System: Clinical Finds, Etiological Agents, and Predisposing Factors. Life (Basel) 2023; 13:2083. [PMID: 37895464 PMCID: PMC10607993 DOI: 10.3390/life13102083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 10/06/2023] [Accepted: 10/08/2023] [Indexed: 10/29/2023] Open
Abstract
On the 23rd of September 2022, a small intensive aquaculture unit populated with rainbow trout (Oncorhynchus mykiss) reported increased mortality in adults and juvenile fish. The unit comprised 12 enclosed concrete basins with a capacity of ten cubic meters of water, populated with 150 kg of fish each. Fish were subjected to a clinical examination on the site, after which whole fish were harvested for a bacteriological and histopathological examination. Water quality parameters were examined using classic biochemical methods and Fourier Transform Infrared Spectroscopy in order to find out whether the environment in which the fish live is also a predisposing factor that could facilitate different pathogens and induce a state of disease in the fish. Real-time PCR was performed on strains of Aeromonas spp. sampled from the fish to accurately identify the pathogen species. The goal was to accurately identify the problems and predisposing factors that lead to disease outbreaks.
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Affiliation(s)
- Adrian Bălbărău
- Faculty of Veterinary Medicine, “Ion Ionescu de la Brad” Iași University of Life Sciences, Aleea Mihail Sadoveanu nr. 8, 700489 Iaşi, Romania (C.M.R.); (D.A.); (L.M.)
| | - Larisa Maria Ivanescu
- Faculty of Veterinary Medicine, “Ion Ionescu de la Brad” Iași University of Life Sciences, Aleea Mihail Sadoveanu nr. 8, 700489 Iaşi, Romania (C.M.R.); (D.A.); (L.M.)
| | - Gabriela Martinescu
- Faculty of Veterinary Medicine, “Ion Ionescu de la Brad” Iași University of Life Sciences, Aleea Mihail Sadoveanu nr. 8, 700489 Iaşi, Romania (C.M.R.); (D.A.); (L.M.)
| | - Cristina Mihaela Rîmbu
- Faculty of Veterinary Medicine, “Ion Ionescu de la Brad” Iași University of Life Sciences, Aleea Mihail Sadoveanu nr. 8, 700489 Iaşi, Romania (C.M.R.); (D.A.); (L.M.)
| | - Dumitru Acatrinei
- Faculty of Veterinary Medicine, “Ion Ionescu de la Brad” Iași University of Life Sciences, Aleea Mihail Sadoveanu nr. 8, 700489 Iaşi, Romania (C.M.R.); (D.A.); (L.M.)
| | - Mircea Lazar
- Faculty of Veterinary Medicine, “Ion Ionescu de la Brad” Iași University of Life Sciences, Aleea Mihail Sadoveanu nr. 8, 700489 Iaşi, Romania (C.M.R.); (D.A.); (L.M.)
| | - Iuliana Cocean
- Faculty of Physics, Atmosphere Optics, Spectroscopy and Laser Laboratory (LOASL), “Alexandru Ioan Cuza” University of Iasi, 11 Carol I Bld., 700506 Iasi, Romania
| | - Silviu Gurlui
- Faculty of Physics, Atmosphere Optics, Spectroscopy and Laser Laboratory (LOASL), “Alexandru Ioan Cuza” University of Iasi, 11 Carol I Bld., 700506 Iasi, Romania
| | - Alexandru Cocean
- Faculty of Physics, Atmosphere Optics, Spectroscopy and Laser Laboratory (LOASL), “Alexandru Ioan Cuza” University of Iasi, 11 Carol I Bld., 700506 Iasi, Romania
- Laboratory of Applied Meteorology and Climatology, A Building, Physics, Research Center with Integrated Techniques for Atmospheric Aerosol Investigation in Romania, RECENT AIR, “Alexandru Ioan Cuza” University of Iasi, 11 Carol I, 700506 Iasi, Romania
| | - Liviu Miron
- Faculty of Veterinary Medicine, “Ion Ionescu de la Brad” Iași University of Life Sciences, Aleea Mihail Sadoveanu nr. 8, 700489 Iaşi, Romania (C.M.R.); (D.A.); (L.M.)
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12
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Kim M, Reyes GA, Cheng X, Stasiewicz MJ. Simulation Evaluation of Power of Sampling Plans to Detect Cronobacter in Powdered Infant Formula Production. J Food Prot 2023:100115. [PMID: 37295498 DOI: 10.1016/j.jfp.2023.100115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/17/2023] [Accepted: 06/03/2023] [Indexed: 06/12/2023]
Abstract
Cronobacteris a hazard in Powdered Infant Formula (PIF) products that is hard to detect due to localized and low-level contamination. We adapted a previously published sampling simulation to PIF sampling and benchmarked industry-relevant sampling plans across different numbers of grabs, total sample mass, and sampling patterns. We evaluated performance to detect published Cronobacter contamination profiles for a recalled PIF batch [42% prevalence, -1.8±0.7 log(CFU/g)] and a reference, non-recalled, PIF batch [1% prevalence, -2.4±0.8 log(CFU/g)]. Simulating a range of numbers of grabs [n=1 to 22,000 (representing testing every finished package)] with 300 g total composite mass showed that taking 30 or more grabs detected contamination reliably (<1% median probability to accept the recalled batch). Benchmarking representative sampling plans ([n=30, mass grab=10g], [n=30, m=25g], [n=60, m=25g], [n=180, m=25g]) showed that all plans would reject the recalled batch (<1% median probability to accept) but would rarely reject the reference batch (>50% median probability of acceptance, all plans). Overall, (i) systematic or stratified random sampling patterns are equal to or more powerful than random sampling of the same sample size and total sampled mass, and, (ii) taking more samples, even if smaller, can increase the power to detect contamination.
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Affiliation(s)
- Minho Kim
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, IL 61801.
| | - Gustavo A Reyes
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, IL 61801.
| | - Xianbin Cheng
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, IL 61801.
| | - Matthew J Stasiewicz
- Department of Food Science and Human Nutrition, University of Illinois Urbana-Champaign, IL 61801.
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13
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Mousavi ZE, Hunt K, Koolman L, Butler F, Fanning S. Cronobacter Species in the Built Food Production Environment: A Review on Persistence, Pathogenicity, Regulation and Detection Methods. Microorganisms 2023; 11:1379. [PMID: 37374881 DOI: 10.3390/microorganisms11061379] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 05/17/2023] [Accepted: 05/22/2023] [Indexed: 06/29/2023] Open
Abstract
The powdered formula market is large and growing, with sales and manufacturing increasing by 120% between 2012 and 2021. With this growing market, there must come an increasing emphasis on maintaining a high standard of hygiene to ensure a safe product. In particular, Cronobacter species pose a risk to public health through their potential to cause severe illness in susceptible infants who consume contaminated powdered infant formula (PIF). Assessment of this risk is dependent on determining prevalence in PIF-producing factories, which can be challenging to measure with the heterogeneity observed in the design of built process facilities. There is also a potential risk of bacterial growth occurring during rehydration, given the observed persistence of Cronobacter in desiccated conditions. In addition, novel detection methods are emerging to effectively track and monitor Cronobacter species across the food chain. This review will explore the different vehicles that lead to Cronobacter species' environmental persistence in the food production environment, as well as their pathogenicity, detection methods and the regulatory framework surrounding PIF manufacturing that ensures a safe product for the global consumer.
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Affiliation(s)
- Zeinab Ebrahimzadeh Mousavi
- UCD-Centre for Food Safety, School of Public Health, Physiotherapy and Sports Science, University College Dublin, D04 V1W8 Dublin, Ireland
- School of Biosystems and Food Engineering, University College Dublin, Belfield, Dublin 4, D04 V1W8 Dublin, Ireland
- Department of Food Science and Engineering, Faculties of Agriculture and Natural Resources, University of Tehran, Karaj 6719418314, Iran
| | - Kevin Hunt
- School of Biosystems and Food Engineering, University College Dublin, Belfield, Dublin 4, D04 V1W8 Dublin, Ireland
| | - Leonard Koolman
- UCD-Centre for Food Safety, School of Public Health, Physiotherapy and Sports Science, University College Dublin, D04 V1W8 Dublin, Ireland
| | - Francis Butler
- School of Biosystems and Food Engineering, University College Dublin, Belfield, Dublin 4, D04 V1W8 Dublin, Ireland
| | - Séamus Fanning
- UCD-Centre for Food Safety, School of Public Health, Physiotherapy and Sports Science, University College Dublin, D04 V1W8 Dublin, Ireland
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14
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Zufüttern zum Stillen bei reifen Neugeborenen in der ersten Lebenswoche und alimentäre Allergieprävention bei nichtgestillten Säuglingen. Monatsschr Kinderheilkd 2023. [DOI: 10.1007/s00112-023-01725-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2023]
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15
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Zhang T, Yue Y, Jeong SJ, Ryu MS, Wu X, Yang HJ, Li C, Jeong DY, Park S. Improvement of Estrogen Deficiency Symptoms by the Intake of Long-Term Fermented Soybeans (Doenjang) Rich in Bacillus Species through Modulating Gut Microbiota in Estrogen-Deficient Rats. Foods 2023; 12:foods12061143. [PMID: 36981070 PMCID: PMC10048008 DOI: 10.3390/foods12061143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 03/02/2023] [Accepted: 03/06/2023] [Indexed: 03/30/2023] Open
Abstract
Traditionally made doenjang (TMD) produced by the long-term fermentation of soybeans with salt may improve symptoms of estrogen deficiency. We aimed to evaluate the effects of four TMD types, containing low and high amounts of Bacillus species and biogenic amines (HBHA, HBLA, LBHA, and LBLA), on energy, glucose, and lipid metabolism, by altering the gut microbiota in estrogen-deficient ovariectomized (OVX) rats. Their mechanisms were also examined. The OVX rats were divided into the control, cooked soybean (CSB), HBHA, LBHA, HBLA, and LBLA groups. Sham-operated rats were the normal control group. Serum 17β-estradiol concentrations were similar among all OVX groups. Tail skin temperatures, which are indicative of hot flashes, were higher in the control than the HBHA and HBLA groups and were similar to the normal control group. Weight gain and visceral fat mass were lower in the TMD and CSB intake groups but not as low as in the normal control group. Lean body mass showed a trend opposite to that of visceral fat in the respective groups. The hepatic triglyceride content decreased with the TMD intake compared to the control and CSB groups. mRNA expressions of the peroxisome proliferator-activated receptor-γ (PPAR-γ) and carnitine palmitoyltransferase-1 in the TMD and CSB groups were as high as in the normal control group, and the PPAR-γ mRNA expression was more elevated in the HBLA group than in the normal control group. The morphology of the intestines improved in the TMD groups compared to the control, and the HBHA and HBLA groups showed an enhanced improvement compared to the CSB group. The HBHA, HBLA, and LBHA groups increased the α-diversity of the cecal microbiota compared to the control. Akkermenia and Lactobacillus were higher in the HBLA and LBLA groups compared to the control. The expression of the estrogen, forkhead box proteins of the class-O subgroup, and insulin-signaling pathways were lower in the control group, and HBHA and HBLA prevented their decrement. In conclusion, long-term treatment with TMD containing high amounts of Bacillus potentially improves estrogen deficiency symptoms more than unfermented soybeans.
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Affiliation(s)
- Ting Zhang
- Department of Bioconvergence, Hoseo University, 20 hoseoro79bun-gil, Baebang-yup, Asan 31499, Republic of Korea
| | - Yu Yue
- Obesity/Diabetes Research Center, Department of Food and Nutrition, Hoseo University, Asan 31499, Republic of Korea
| | - Su-Ji Jeong
- Sunchang Research Center for Fermentation Microbes, Department of R & D, Microbial Institute for Fermentation Industry, 61-27 Minsokmaeul-gil, Sunchang-Gun 56048, Republic of Korea
| | - Myeong-Seon Ryu
- Sunchang Research Center for Fermentation Microbes, Department of R & D, Microbial Institute for Fermentation Industry, 61-27 Minsokmaeul-gil, Sunchang-Gun 56048, Republic of Korea
| | - Xuangao Wu
- Department of Bioconvergence, Hoseo University, 20 hoseoro79bun-gil, Baebang-yup, Asan 31499, Republic of Korea
| | - Hee-Jong Yang
- Sunchang Research Center for Fermentation Microbes, Department of R & D, Microbial Institute for Fermentation Industry, 61-27 Minsokmaeul-gil, Sunchang-Gun 56048, Republic of Korea
| | - Chen Li
- Obesity/Diabetes Research Center, Department of Food and Nutrition, Hoseo University, Asan 31499, Republic of Korea
| | - Do-Youn Jeong
- Sunchang Research Center for Fermentation Microbes, Department of R & D, Microbial Institute for Fermentation Industry, 61-27 Minsokmaeul-gil, Sunchang-Gun 56048, Republic of Korea
| | - Sunmin Park
- Department of Bioconvergence, Hoseo University, 20 hoseoro79bun-gil, Baebang-yup, Asan 31499, Republic of Korea
- Obesity/Diabetes Research Center, Department of Food and Nutrition, Hoseo University, Asan 31499, Republic of Korea
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16
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Yang G, Xu J, Xu Y, Li R, Wang S. Analysis of Dynamics and Diversity of Microbial Community during Production of Germinated Brown Rice. Foods 2023; 12:foods12040755. [PMID: 36832830 PMCID: PMC9956166 DOI: 10.3390/foods12040755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/30/2023] [Accepted: 02/06/2023] [Indexed: 02/11/2023] Open
Abstract
Sprouts may be contaminated with different pathogenic and spoilage microorganisms, which lead far too easily to foodborne outbreaks. The elucidations of microbial profiles in germinated brown rice (BR) are important, but the changes in the microbial composition during germination are unknown. This study aimed to investigate the microbiota composition and to monitor the dominant microbial dynamics in BR during germination using both culture-independent and -dependent methods. BR samples (HLJ2 and HN) were collected from each stage of the germination processing. The populations of microbes (total viable counts, yeast/mold counts, Bacillus cereus, and Enterobacteriaceae) of two BR cultivars increased markedly with the prolongation of the germination time. High-throughput sequencing (HTS) showed that the germination process significantly influenced the microbial composition and reduced the microbial diversity. Similar microbial communities were observed between the HLJ2 and the HN samples, but with different microbial richness. The bacterial and fungal alpha diversity achieved the maximum for ungerminated samples and declined significantly after soaking and germination. During germination, Pantoea, Bacillus, and Cronobacter were the dominant bacterial genera, but Aspergillus, Rhizopus, and Coniothyrium dominated for the fungi in the BR samples. The predominance of harmful and spoilage microorganisms in BR during germination is mainly from contaminated seeds, which highlights the potential risk of foodborne illness from sprouted BR products. The results provide new insight into the microbiome dynamics of BR and may help to establish effective decontamination measures against pathogenic microorganisms during sprout production.
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Affiliation(s)
- Gaoji Yang
- College of Mechanical and Electronic Engineering, Northwest A & F University, Xianyang 712100, China
| | - Juanjuan Xu
- College of Mechanical and Electronic Engineering, Northwest A & F University, Xianyang 712100, China
| | - Yuanmei Xu
- College of Mechanical and Electronic Engineering, Northwest A & F University, Xianyang 712100, China
| | - Rui Li
- College of Mechanical and Electronic Engineering, Northwest A & F University, Xianyang 712100, China
| | - Shaojin Wang
- College of Mechanical and Electronic Engineering, Northwest A & F University, Xianyang 712100, China
- Department of Biological Systems Engineering, Washington State University, 213 L.J. Smith Hall, Pullman, WA 99164-6120, USA
- Correspondence: ; Tel.: +86-29-87092391; Fax: +86-29-87091737
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17
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Wang H, Li Y, Li Z, Ma R, Bai X, Zhan X, Luo K, Su R, Li X, Xia X, Shi C. Inhibition of Cronobacter sakazakii by Litsea cubeba Essential Oil and the Antibacterial Mechanism. Foods 2022; 11:foods11233900. [PMID: 36496708 PMCID: PMC9736361 DOI: 10.3390/foods11233900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 11/16/2022] [Accepted: 11/17/2022] [Indexed: 12/12/2022] Open
Abstract
Litsea cubeba essential oil (LC-EO) has anti-insecticidal, antioxidant, and anticancer proper-ties; however, its antimicrobial activity toward Cronobacter sakazakii has not yet been researched extensively. The objective of this study was to investigate the antimicrobial and antibiofilm effects of LC-EO toward C. sakazakii, along with the underlying mechanisms. The minimum inhibitory concentrations of LC-EO toward eight different C. sakazakii strains ranged from 1.5 to 4.0 μL/mL, and LC-EO exposure showed a longer lag phase and lower specific growth compared to untreated bacteria. LC-EO increased reactive oxygen species production, decreased the integrity of the cell membrane, caused cell membrane depolarization, and decreased the ATP concentration in the cell, showing that LC-EO caused cellular damage associated with membrane permeability. LC-EO induced morphological changes in the cells. LC-EO inhibited C. sakazakii in reconstituted infant milk formula at 50 °C, and showed effective inactivation of C. sakazakii biofilms on stainless steel surfaces. Confocal laser scanning and attenuated total reflection-Fourier-transform infrared spectrometry indicated that the biofilms were disrupted by LC-EO. These findings suggest a potential for applying LC-EO in the prevention and control of C. sakazakii in the dairy industry as a natural antimicrobial and antibiofilm agent.
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Affiliation(s)
- Haoran Wang
- College of Food Science and Engineering, Northwest A&F University, Xianyang 712100, China
| | - Yulu Li
- College of Food Science and Engineering, Northwest A&F University, Xianyang 712100, China
| | - Zhuo Li
- College of Food Science and Engineering, Northwest A&F University, Xianyang 712100, China
| | - Run Ma
- College of Food Science and Engineering, Northwest A&F University, Xianyang 712100, China
| | - Xiangyang Bai
- College of Food Science and Engineering, Northwest A&F University, Xianyang 712100, China
| | - Xiangjun Zhan
- College of Food Science and Engineering, Northwest A&F University, Xianyang 712100, China
| | - Kunyao Luo
- College of Food Science and Engineering, Northwest A&F University, Xianyang 712100, China
| | - Ruiying Su
- College of Food Science and Engineering, Northwest A&F University, Xianyang 712100, China
| | - Xuejiao Li
- College of Food Science and Engineering, Northwest A&F University, Xianyang 712100, China
| | - Xiaodong Xia
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116304, China
| | - Chao Shi
- College of Food Science and Engineering, Northwest A&F University, Xianyang 712100, China
- Correspondence: ; Tel.: +86-29-87092486; Fax: +86-29-87091391
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18
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Draft Genome Sequence of Cronobacter sakazakii H05, Sequence Type 156, Isolated from a Spiced Ground Beef Dish, Kitfo. Microbiol Resour Announc 2022; 11:e0064322. [PMID: 36227094 PMCID: PMC9670895 DOI: 10.1128/mra.00643-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Cronobacter sakazakii is a foodborne pathogen that causes severe illness in neonates and the elderly. Here, we present the genome sequence of C. sakazakii H05 sequence type 156 (ST156), CC21 strain from Kitfo, resulting in a genome size of 4,495,386 bp, with 4,340 coding sequences and a G+C content of 56.85% after assembly and annotation.
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19
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Said MM, El-barbary YA, Ahmed OM. Assessment of Performance, Microbial Community, Bacterial Food Quality, and Gene Expression of Whiteleg Shrimp ( Litopenaeus vannamei) Reared under Different Density Biofloc Systems. AQUACULTURE NUTRITION 2022; 2022:3499061. [PMID: 36860427 PMCID: PMC9973138 DOI: 10.1155/2022/3499061] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 09/08/2022] [Indexed: 06/18/2023]
Abstract
Biofloc shrimp culture, as a way of improving shrimp production, gains worldwide consideration. However, the effects of the biofloc system on shrimp culture at high densities could be a challenge. Here, this study is aimed at identifying a better stocking density of whiteleg shrimp (Litopenaeus vannamei) between two intensive biofloc systems of 100 and 300 org./m2. Achieving that was done by comparing growth performance, water quality, feed utilization, microbial loads from water and shrimps, and gene expression of growth, stress, and immune-related genes. Shrimp postlarvae with a mean weight of 35.4 ± 3.7 mg were reared in six indoor cement tanks (36 m3 total capacity each) at two stocking densities (3 replicates each) for a rearing period of 135 days. Better final weight, weight gain, average daily weight gain, specific growth rate, biomass increase percentage, and survival rate were associated with lower density (100/m2), whereas high-density showed significantly higher total biomass. Better feed utilization was found in the lower density treatment. Lower density treatment enhanced water quality parameters, including higher dissolved oxygen and lower nitrogenous wastes. Heterotrophic bacterial count in water samples was recorded as 5.28 ± 0.15 and 5.11 ± 0.28 log CFU/ml from the high- and low-density systems, respectively, with no significant difference. Beneficial bacteria such as Bacillus spp. were identified in water samples from both systems, still, the Vibrio-like count was developed in the higher density system. Regarding shrimp food bacterial quality, the total bacterial count in the shrimp was recorded as 5.09 ± 0.1 log CFU/g in the 300 org./m2 treatment compared to 4.75 ± 0.24 log CFU/g in the lower density. Escherichia coli was isolated from the shrimps in a lower density group while Aeromonas hydrophila and Citrobacter freundii were associated with shrimps from a higher density system. Immune-related genes including prophenoloxidase, superoxide dismutase (SOD), and lysozyme (LYZ) expressions were all significantly higher expressed in the shrimp from the lower density treatment. Toll receptor (LvToll), penaiedin4 (PEN4), and stress-related gene (HSP 70) showed a decreased gene expression in the shrimp raised in the lower density. Significant upregulation of growth-related gene (Ras-related protein-RAP) expression was associated with the lower stocking density system. In conclusion, the current study found that applying high stocking density (300 org./m2) contributes negatively to performance, water quality, microbial community, bacterial food quality, and gene expression of immune, stress, and growth-related genes when compared with the lower stocking density system (100 org./m2) under biofloc system.
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Affiliation(s)
- Mohamed M. Said
- Department of Aquaculture, Faculty of Fish Resources, Suez University, Suez, Egypt
| | - Y. A. El-barbary
- Department of Fish Health and Diseases, Faculty of Fish Resources, Suez University, Suez, Egypt
| | - O. M. Ahmed
- Department of Fish Processing and Technology, Faculty of Fish Resources, Suez University, Suez, Egypt
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20
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The Role of ptsH in Stress Adaptation and Virulence in Cronobacter sakazakii BAA-894. Foods 2022; 11:foods11172680. [PMID: 36076869 PMCID: PMC9455513 DOI: 10.3390/foods11172680] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/21/2022] [Accepted: 08/30/2022] [Indexed: 11/17/2022] Open
Abstract
Cronobacter sakazakii, an emerging foodborne pathogen that was isolated primarily from powdered infant formula, poses an important issue in food safety due to its high stress tolerance and pathogenicity. The Hpr (encoded by ptsH gene) has been shown to regulate carbon metabolism as well as stress response and virulence. However, the functional properties of ptsH in C. sakzakii have not been investigated. In this study, we clarified the role of ptsH in the C. sakzakii stress response and virulence, and explored its possible regulatory mechanism by RNA-seq. Compared with wild-type, the ΔptsH mutant showed a slower growth rate in the log phase but no difference in the stationary phase. Moreover, the resistance to heat stress (65 °C, 55 °C), simulated gastric fluid (pH = 2.5), biofilm formation and adhesion to HT-29 cells of ΔptsH mutant were significantly decreased, whereas the oxidative resistance (1, 5, 10 mM H2O2), osmotic resistance (10%, 15%, 20% NaCl), and superoxide dismutase activity were enhanced. Finally, RNA-seq analysis revealed the sulfur metabolism pathway is significantly upregulated in the ΔptsH mutant, but the bacterial secretion system pathway is dramatically downregulated. The qRT-PCR assay further demonstrated that the ΔptsH mutant has elevated levels of genes that are related to oxidative and osmotic stress (sodA, rpoS, cpxA/R, osmY). This study provides a great understanding of the role of ptsH in diverse stress responses and virulence in C. sakazakii, and it contributes to our understanding of the genetic determinant of stress resistance and pathogenicity of this important foodborne pathogen.
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Li H, Zhao Y, Zhang J, Li W, You Q, Zeng X, Xu H. Silver nanoparticles reduce the tolerance of Cronobacter sakazakii to environmental stress by inhibiting expression of related genes. J Dairy Sci 2022; 105:6469-6482. [PMID: 35840406 DOI: 10.3168/jds.2022-21833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 04/25/2022] [Indexed: 11/19/2022]
Abstract
Cronobacter sakazakii is a food-borne pathogen that is resistant to a variety of environmental stress conditions. It can survive in harsh environments. We studied the effects of silver nanoparticles (AgNP) on the environmental tolerance and biofilm formation of C. sakazakii. First, we determined the minimum inhibitory concentration (MIC) of AgNP to C. sakazakii and determined the growth curve of C. sakazakii treated with different concentrations of AgNP by using the plate counting method. After determining the sub-inhibition concentrations (SIC) of AgNP on C. sakazakii, we studied the effects of AgNP on the resistance of C. sakazakii to heat, desiccation, osmotic pressure, and acid. The antibiofilm activity of AgNP was also studied. Finally, real-time quantitative PCR was used to analyze the transcription levels of 16 genes related to the environmental tolerance of C. sakazakii. The SIC of AgNP significantly reduced the survival rate of C. sakazakii under various environmental stress conditions. The results showed that AgNP at 0.625 and 1.25 μg/mL significantly inhibited the formation of C. sakazakii biofilms. The expression levels of most genes were significantly downregulated in C. sakazakii cells treated with 0.625 and 1.25 μg/mL AgNP. Therefore, AgNP may reduce the environmental tolerance of C. sakazakii by inhibiting the expression of genes related to stress tolerance. Moreover, AgNP inhibited the production of ATP in C. sakazakii cells and the formation of C. sakazakii biofilms. Our research provides a theoretical basis for the application of AgNP in food packaging, bactericidal coatings, and other fields.
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Affiliation(s)
- Hui Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, China
| | - Yi Zhao
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, China
| | - Jingjing Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, China
| | - Wen Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, China
| | - Qixiu You
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, China
| | - Xianxiang Zeng
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, China
| | - Hengyi Xu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, China.
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Sentongo T, Velez DS, Huynh P, Abdelhadi R, Chan A, Goday P, Karjoo S, Kinberg S, Merritt R, Pai N, Quiros-Tejeira RE, Duro D. Managing the Impact of Cronobacter sakazakii , the Nemesis of Powdered Formula. J Pediatr Gastroenterol Nutr 2022; 75:113-115. [PMID: 35666843 DOI: 10.1097/mpg.0000000000003508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Affiliation(s)
| | | | | | | | - Alvin Chan
- the University of California, Los Angeles, CA
| | | | - Sara Karjoo
- the John Hopkins Medicine, St Petersburg, FL
| | | | | | - Nikhil Pai
- the McMaster University, Hamilton ON, Canada
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A Newly Identified Group of P-like (PL) Fimbria Genes from Extraintestinal Pathogenic Escherichia coli (ExPEC) Encode Distinct Adhesin Subunits and Mediate Adherence to Host Cells. Appl Environ Microbiol 2022; 88:e0142121. [PMID: 35758695 PMCID: PMC9275220 DOI: 10.1128/aem.01421-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Fimbrial adhesins promote bacterial adherence and biofilm formation. Sequencing of avian pathogenic Escherichia coli (APEC) strain QT598 identified new fimbriae belonging to the π group, which we named PL (P-like) fimbriae since the genetic organization and sequence are similar to those of P and related fimbriae. Genes encoding PL fimbriae located on IncF plasmids are present in diverse E. coli isolates from poultry, human systemic infections, and other sources. As with P fimbriae, PL fimbriae exhibit divergence in adhesin-encoding genes and could be divided into 5 classes based on sequence differences in the PlfG adhesin. plf genes from two predominant PlfG adhesin classes, PlfG class I (PlfGI) and PlfGII, were cloned. PL fimbriae were visualized by electron microscopy, associated with increased biofilm, demonstrated distinct hemagglutination profiles, and promoted adherence to human bladder and kidney epithelial cells. The genes encoding hybrid fimbriae were comprised of genes from plfQT598, wherein plfG was replaced by papG; the adhesin-encoding genes were also functional and mediated adherence to epithelial cells, demonstrating compatibility between the components of these two types of fimbriae. Deletion of plf genes did not reduce colonization of the mouse urinary tract in a single-strain infection model. In contrast, loss of plf genes significantly reduced competitive colonization in the mouse kidneys. Furthermore, plf gene expression was increased over 40-fold in the bladder compared to during in vitro culture. Overall, PL fimbriae represent a new group of fimbriae demonstrating both functional differences from and similarities to P fimbriae, which mediated adherence to host cells and improved competitive colonization of the mouse kidney. IMPORTANCE Fimbriae are important colonization factors in many bacterial species. The identification of a new type of fimbriae encoded on some IncF plasmids in E. coli was investigated. Genomic sequences demonstrated these fimbrial gene clusters have genetic diversity, particularly in the adhesin-encoding plfG gene. Functional studies demonstrated differences in hemagglutination specificity, although both types of Plf adhesin under study mediated adherence to human urinary epithelial cells. A plf mutant also showed decreased colonization of the kidneys in a mouse competitive infection model. PL fimbriae may represent previously unrecognized adhesins that could contribute to host specificity and tissue tropism of some E. coli strains.
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Xie Y, Zhou L, Dai J, Chen J, Yang X, Wang X, Wang Z, Feng L. Effects of the C/N ratio on the microbial community and lignocellulose degradation, during branch waste composting. Bioprocess Biosyst Eng 2022; 45:1163-1174. [DOI: 10.1007/s00449-022-02732-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Accepted: 04/27/2022] [Indexed: 11/30/2022]
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Xu X, Zhu L, Wang X, Lan X, Chu H, Tian H, Xu W. Sandwich capture ultrasensitive sensor based on biohybrid interface for the detection of Cronobacter sakazakii. Appl Microbiol Biotechnol 2022; 106:4287-4296. [PMID: 35616722 DOI: 10.1007/s00253-022-11978-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 05/04/2022] [Accepted: 05/10/2022] [Indexed: 11/29/2022]
Abstract
A simple, rapid and ultrasensitive visual sensing method for the detection of Cronobacter sakazakii (C. sakazakii) based on a biohybrid interface was established. During the entire sensing process, quadruple-cascade amplification showed its superior sensing performance. First, the prepared immunomagnetic beads (IMB) were used to isolate and enrich specific targets from the food matrix. After adding the fusion aptamer, the aptamer sequence specifically recognized the target and formed the immune sandwich structure of antibody-target-fusion aptamer. In addition, the fusion aptamer also included the template sequence of exponential amplification reaction (EXPAR), which contained the antisense sequence of the G-rich sequence. Therefore, a large number of G-rich sequences can be generated after EXPAR can be triggered in the presence of Bst. DNA polymerase, nicking endonuclease, cDNA, and dNTP. They were self-assembled into G-quadruplex structures and then combined with hemin to form G4/hemin DNAzyme, resulting in visible coloration and measuring absorbance at 450 nm for quantitative detection. The assay showed a limit of detection (LOD) of 2 CFU/mL in pure culture and 12 CFU/g in milk powder in optimal conditions. This method provides a promising strategy for rapid and point-of-care testing (POCT) since it does not require DNA extraction, medium culturing, and expensive instrumentation. KEY POINTS: •Single-cell level detection of C. sakazakii with ultrasensitive and rapidness •The fusion aptamer integrated recognition and amplification •Sensing analysis of C. sakazakii based on cascade amplification of biohybrid interface.
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Affiliation(s)
- Xiuyuan Xu
- College of Food Science and Technology, Hebei Agricultural University, Baoding, Hebei, 071001, People's Republic of China
| | - Longjiao Zhu
- Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health (Institute of Nutrition and Health), China Agricultural University, Tianxiu Road 10, Beijing, 100083, People's Republic of China
| | - Xinxin Wang
- College of Food Science and Technology, Hebei Agricultural University, Baoding, Hebei, 071001, People's Republic of China
| | - Xinyue Lan
- Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health (Institute of Nutrition and Health), China Agricultural University, Tianxiu Road 10, Beijing, 100083, People's Republic of China
| | - Huashuo Chu
- Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety) (MOA), Beijing Laboratory for Food Quality and Safety, College of Food Science & Nutritional Engineering, Beijing, 100083, People's Republic of China
| | - Hongtao Tian
- College of Food Science and Technology, Hebei Agricultural University, Baoding, Hebei, 071001, People's Republic of China.
| | - Wentao Xu
- Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health (Institute of Nutrition and Health), China Agricultural University, Tianxiu Road 10, Beijing, 100083, People's Republic of China. .,Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety) (MOA), Beijing Laboratory for Food Quality and Safety, College of Food Science & Nutritional Engineering, Beijing, 100083, People's Republic of China.
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Virulence and DNA sequence analysis of Cronobacter spp. isolated from infant cereals. Int J Food Microbiol 2022; 376:109745. [DOI: 10.1016/j.ijfoodmicro.2022.109745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 05/21/2022] [Accepted: 05/23/2022] [Indexed: 11/20/2022]
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Fei P, Xing M, Feng Y, Liu S, Chang Y, Wang Y, Yu Y, Shi E, Zhang Y, Bian X, Chen J. Occurrence, Molecular Characterization, and Antibiotic Resistance of Cronobacter sakazakii in Goat Milk-Based Infant Formula from Shaanxi Province, China. Foodborne Pathog Dis 2022; 19:304-310. [PMID: 35447050 DOI: 10.1089/fpd.2021.0095] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
This study aimed to investigate the prevalence of Cronobacter sakazakii in goat milk-based infant formula (GIF) collected from Shaanxi Province, China, and reveal the molecular characterization and antibiotic resistance profile of these isolates. A total of 750 GIF samples were collected from the retail markets in 5 cities in Shaanxi Province from February 2019 to February 2021. Molecular characterization was investigated using multilocus sequence typing and O-antigen serotyping. Antibiotic resistance of C. sakazakii isolates was assessed using antimicrobial susceptibility testing. Thirty-two strains of C. sakazakii were isolated from GIF samples with a prevalence rate of 4.27% and were divided into 16 sequence types (STs); among them, ST4 (6/32, 18.75%) and ST21 (5/32, 15.63%) were dominant. Five C. sakazakii serotypes (O2, O1, O7, O4, and O3) were detected, and C. sakazakii serotype O2 (15/32, 46.88%) was the main. Of the 21 antimicrobials, isolates showed higher resistance against cephalothin (87.5%), amoxicillin (25%), azithromycin (18.75%), oxytetracycline (18.75%), ampicillin (12.5%), and streptomycin (12.5%). In addition, three isolates were found to be resistant to three antimicrobials. These findings revealed the potential epidemiological risk and characterization of C. sakazakii in GIF from Shaanxi Province, China, and provided reference data for the effective prevention and control of C. sakazakii in powdered infant formula.
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Affiliation(s)
- Peng Fei
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, China.,School of Zhang Zhongjing Health Care and Food, Nanyang Institute of Technology, Nanyang, China.,College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, China
| | - Min Xing
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, China
| | - Yage Feng
- School of Zhang Zhongjing Health Care and Food, Nanyang Institute of Technology, Nanyang, China
| | - Shun Liu
- School of Zhang Zhongjing Health Care and Food, Nanyang Institute of Technology, Nanyang, China
| | - Yajing Chang
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, China
| | - Yao Wang
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, China
| | - Yaping Yu
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, China
| | - Encong Shi
- Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, China
| | - Yaqing Zhang
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, China
| | - Xin Bian
- Key Laboratory of Food Science and Engineering of Heilongjiang Province, College of Food Engineering, Harbin University of Commerce, Harbin, China
| | - Junliang Chen
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, China
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Infection prevention requirements for the medical care of immunosuppressed patients: recommendations of the Commission for Hospital Hygiene and Infection Prevention (KRINKO) at the Robert Koch Institute. GMS HYGIENE AND INFECTION CONTROL 2022; 17:Doc07. [PMID: 35707229 PMCID: PMC9174886 DOI: 10.3205/dgkh000410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In Germany, guidelines for hygiene in hospitals are given in form of recommendations by the Commission for Hospital Hygiene and Infection Prevention (Kommission für Krankenhaushygiene und Infektionsprävention, "KRINKO"). The KRINKO and its voluntary work are legitimized by the mandate according to § 23 of the Infection Protection Act (Infektionsschutzgesetz, "IfSG"). The original German version of this document was published in February 2021 and has now been made available to the international professional public in English. The guideline provides recommendations on infection prevention and control for immunocompromised individuals in health care facilities. This recommendation addresses not only measures related to direct medical care of immunocompromised patients, but also management aspects such as surveillance, screening, antibiotic stewardship, and technical/structural aspects such as patient rooms, air quality, and special measures during renovations.
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Antibiotic Resistance and Molecular Characterization of Cronobacter sakazakii Strains Isolated from Powdered Infant Formula Milk. Foods 2022; 11:foods11081093. [PMID: 35454680 PMCID: PMC9029396 DOI: 10.3390/foods11081093] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 03/28/2022] [Accepted: 04/04/2022] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Cronobacter sakazakii is a new emerging foodborne bacterial pathogen associated with severe lethal diseases such as meningitis, necrotizing enterocolitis, and septicemia in infants and neonates. Powdered infant formula milk (PIFM) has been recognized as one of the main transmission vehicles and contaminated sources of this pathogen. This study aimed to investigate the prevalence rate, genotypic and phenotypic antibiotic resistance profile, and clonal relatedness of C. sakazakii strains isolated from 364 PIFM samples collected from Tehran city, Iran. METHODS Culture-based methods, Kirby-Bauer disk diffusion antibiotic resistance testing, conventional Polymerase Chain Reaction (PCR), and Enterobacterial Repetitive Intergenic Consensus PCR (ERIC-PCR) assays were used in this study to detect and characterize the C. sakazakii isolates. RESULTS We isolated 25 C. sakazakii strains from PIFM samples (6.86%). The isolates were highly resistant to amoxicillin-clavulanic acid, amoxicillin, ampicillin, cefoxitin, cefepime, erythromycin, ceftriaxone, ciprofloxacin, and chloramphenicol and susceptible to gentamicin, tetracycline, norfloxacin, and azithromycin antibiotics. The blaCTX-M-1 gene was detected in 96% of the isolates. The isolates were categorized into eight distinct clonal types using the ERIC-PCR method, showing a high genetic diversity among the isolates. However, there was a significant correlation between the genotypic and phenotypic antibiotic resistance properties of the isolates. CONCLUSIONS Novel microbial surveillance systems for detecting multi-drug-resistant C. sakazakii are required to control the contamination of this foodborne pathogen in infant foods.
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Crystal structures of YeiE from Cronobacter sakazakii and the role of sulfite tolerance in gram-negative bacteria. Proc Natl Acad Sci U S A 2022; 119:e2118002119. [PMID: 35271389 PMCID: PMC8931317 DOI: 10.1073/pnas.2118002119] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
YeiE has been identified as a master virulence factor of Cronobacter sakazakii. In this study, we determined the crystal structures of the regulatory domain of YeiE in complex with its physiological ligand sulfite ion (SO32−). The structure provides the basis for the molecular mechanisms for sulfite sensing and the ligand-dependent conformational changes of the regulatory domain. The genes under the control of YeiE in response to sulfite were investigated to reveal the functional roles of YeiE in the sulfite tolerance of the bacteria. We propose the molecular mechanism underlying the ability of gram-negative pathogens to defend against the innate immune response involving sulfite, thus providing a strategy to control the pathogenesis of bacteria. Cronobacter sakazakii is an emerging gram-negative pathogenic bacterium that causes meningitis, bacteremia, and necrotizing enterocolitis in infants and has a high mortality rate. The YeiE homolog (gpESA_01081) was identified as a global virulence regulator of bacterial pathogenesis in C. sakazakii. YeiE is a LysR-type transcriptional regulator (LTTR) composed of a DNA binding domain and a regulatory domain to recognize the unknown ligand. To reveal the molecular mechanism and function of YeiE, we determined the crystal structure of the regulatory domain of YeiE. A sulfite ion was bound at the putative ligand-binding site, and subsequent studies revealed that the sulfite is the physiological ligand for YeiE. Structural comparisons to its sulfite-free structure further showed the sulfite-dependent conformational change of YeiE. The essential role of YeiE in defending against toxicity from sulfite during the growth of C. sakazakii and Escherichia coli was examined. Furthermore, the target genes and functional roles of YeiE in H2S production and survival capability from neutrophils were investigated. Our findings provide insights into the sophisticated behaviors of pathogenic gram-negative bacteria in response to sulfite from the environment and host.
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Genome sequence analysis of Cronobacter phage PF-CE2 and proposal of a new species in the genus Pseudotevenvirus. Arch Virol 2021; 166:3467-3472. [PMID: 34601635 DOI: 10.1007/s00705-021-05255-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 08/16/2021] [Indexed: 10/20/2022]
Abstract
The genome of a Cronobacter sakazakii M1 phage named PF-CE2 was characterized in this work, and a new species named "Cronobacter virus PF-CE2", in the genus Pseudotevenvirus of the subfamily Tevenvirinae of the family Myoviridae is proposed. The Gp190 gene of phage PF-CE2 is predicted to encode a bacteriophage-borne glycanase that is capable of degrading fucose-containing exopolysaccharides produced by C. sakazakii M1. Furthermore, we propose changing the taxonomic status of eight additional phages based on nucleotide sequence comparisons. This work provides a theoretical basis for subsequent heterologous expression of the phage PF-CE2 glycanase and provides an important reference for the preservation and sharing of these phages.
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Ecology and Function of the Transmissible Locus of Stress Tolerance in Escherichia coli and Plant-Associated Enterobacteriaceae. mSystems 2021; 6:e0037821. [PMID: 34402641 PMCID: PMC8407380 DOI: 10.1128/msystems.00378-21] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The transmissible locus of stress tolerance (tLST) is a genomic island which confers resistance to heat and chlorine. In this study, we determined that the tLST is frequent in genomes of those Enterobacteriaceae that occur in association with plants as well as the intestines of humans and animals and are relevant as nosocomial pathogens, e.g., Klebsiella and Cronobacter species. The tLST is more frequent in environmental and clinical isolates of Klebsiella pneumoniae than in animal isolates, and heat and chlorine resistance of tLST-positive strains of K. pneumoniae matched the resistance of tLST-positive strains of Escherichia coli. The function of 13 tLST genes was determined by assessing the heat and chlorine resistance of E. coli MG1655 mutants. The deletion of sHsp20, clpKGI, sHspGI, pscA, pscB, and hdeDGI reduced both heat and chlorine resistance; deletion of kefB reduced only chlorine resistance. Genes coding for heat shock proteins sHsp20, clpKGI, and sHspGI decreased the oxidation of cytoplasmic proteins, while kefB decreased the oxidation of membrane lipids. The fitness cost of the tLST for E. coli MG1655 was assessed by pairwise competition experiments with isogenic tLST-positive or tLST-negative strains. The tLST imposes a fitness cost that is compensated for by frequent and lethal challenges with chlorine. All core genes need to be present to maintain the ecological advantage relative to the fitness cost. Taken together, core tLST genes are necessary to provide protection for E. coli against heat and chlorine stress, and the selective pressure for the tLST maintains core genes. IMPORTANCE The transmissible locus of stress tolerance (tLST) is a genomic island comprising 10 core genes that occurs in diverse Enterobacteriaceae and confers resistance to heat and chlorine. Experimentation described in the manuscript describes the physiological function of the core genes by characterization of the resistance of 13 single-knockout (KO) mutants and by characterization of protein and membrane oxidation in these strains after chlorine challenge. Results identify tLST resistance as a genomic island that is specific for those Enterobacteriaceae that occur in plant-associated habitats as well in the intestines of vertebrates. In addition, the ecological function of the genomic island was characterized by large-scale genomic analysis and competition experiments of wild-type and mutant strains. Results suggest that tLST-mediated resistance to chlorine may contribute to the persistence of nosocomial pathogens in hospitals.
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Berthold-Pluta A, Garbowska M, Stefańska I, Stasiak-Różańska L, Aleksandrzak-Piekarczyk T, Pluta A. Microbiological Quality of Nuts, Dried and Candied Fruits, Including the Prevalence of Cronobacter spp. Pathogens 2021; 10:900. [PMID: 34358048 PMCID: PMC8308658 DOI: 10.3390/pathogens10070900] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/13/2021] [Accepted: 07/14/2021] [Indexed: 11/21/2022] Open
Abstract
Cronobacter genus bacteria are food-borne pathogens. Foods contaminated with Cronobacter spp. may pose a risk to infants or immunocompromised adults. The aim of this study was to determine the microbiological quality of nuts, seeds and dried fruits with special emphasis on the occurrence of Cronobacter spp. Analyses were carried out on 64 samples of commercial nuts (20 samples), dried fruits (24), candied fruits (8), seeds (4), and mixes of seeds, dried fruits and nuts (8). The samples were tested for the total plate count of bacteria (TPC), counts of yeasts and molds, and the occurrence of Cronobacter spp. Cronobacter isolates were identified and differentiated by PCR-RFLP (Polymerase Chain Reaction - Restriction Fragments Length Polymorphism) and RAPD-PCR (Random Amplified Polymorphic DNA by PCR) analysis. TPC, and yeasts and molds were not detected in 0.1 g of 23.4%, 89.1%, and 32.8% of the analyzed samples. In the remaining samples, TPC were in the range of 1.2-5.3 log CFU g-1. The presence/absence of Cronobacter species was detected in 12 (18.8%) samples of: nuts (10 samples), and mixes (2 samples). The 12 strains of Cronobacter spp. included: C. sakazakii (3 strains), C. malonaticus (5), and C. turicensis (4). The results of this study contribute to the determination of the presence and species identification of Cronobacter spp. in products of plant origin intended for direct consumption.
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Affiliation(s)
- Anna Berthold-Pluta
- Department of Technology and Food Assessment, Division of Milk Technology, Institute of Food Sciences, Warsaw University of Life Sciences—SGGW, 02-787 Warsaw, Poland; (M.G.); (L.S.-R.); (A.P.)
| | - Monika Garbowska
- Department of Technology and Food Assessment, Division of Milk Technology, Institute of Food Sciences, Warsaw University of Life Sciences—SGGW, 02-787 Warsaw, Poland; (M.G.); (L.S.-R.); (A.P.)
| | - Ilona Stefańska
- Department of Preclinical Sciences, Institute of Veterinary Medicine, Warsaw University of Life Sciences—SGGW, 02-787 Warsaw, Poland;
| | - Lidia Stasiak-Różańska
- Department of Technology and Food Assessment, Division of Milk Technology, Institute of Food Sciences, Warsaw University of Life Sciences—SGGW, 02-787 Warsaw, Poland; (M.G.); (L.S.-R.); (A.P.)
| | | | - Antoni Pluta
- Department of Technology and Food Assessment, Division of Milk Technology, Institute of Food Sciences, Warsaw University of Life Sciences—SGGW, 02-787 Warsaw, Poland; (M.G.); (L.S.-R.); (A.P.)
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Ling N, Ou D, Shen Y, Zhang D, Wang Y, Tong L, Ding Y, Wang J, Yang X, Zhang J, Wu Q, Ye Y. Proteomics analysis mediated by quorum sensing luxS involved in oxidative stress in Cronobacter malonaticus. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.111576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Point-of-care and visual detection of Salmonella spp. and Cronobacter spp. by multiplex loop-mediated isothermal amplification label-based lateral flow dipstick in powdered infant formula. Int Dairy J 2021. [DOI: 10.1016/j.idairyj.2021.105022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Zhou A, Wang L, Zhang J, Yang X, Ou Z, Zhao L. Survival of viable but nonculturable Cronobacter sakazakii in macrophages contributes to infections. Microb Pathog 2021; 158:105064. [PMID: 34171399 DOI: 10.1016/j.micpath.2021.105064] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 04/09/2021] [Accepted: 06/16/2021] [Indexed: 02/04/2023]
Abstract
Cronobacter sakazakii (C. sakazakii), a pathogen that exists in dry and low-moisture environments, such as powder infant formula (PIF), can enter a viable but nonculturable (VBNC) state under harsh conditions, which enables it to escape traditional detection methods and thus poses a potential public health risk. This study aimed at assessing the virulent nature of VBNC C. sakazakii. Our results showed that VBNC C. sakazakii induced intestinal inflammation in neonatal rats. However, the degree of inflammation was significantly lower than that of culturable bacteria due to decreasing endotoxin production, motility, adhesion, and invasion ability in the VBNC state. From the perspective of bacterial translocation, the numbers of C. sakazakii in the blood, liver, and spleen of rats treated with VBNC cells were in the same order of magnitude as those treated with its culturable counterpart and may lead to the same degree of bacteremia. According to the macrophage survival assays, the survival rate of VBNC C. sakazakii within macrophages was 4.7 times higher than that of culturable cells. Based on these findings, we hypothesize that VBNC C. sakazakii evaded the host immune defense system, penetrated the tissue barrier, and translocated to the bloodstream, liver, and spleen through macrophages. Thus, our study reveals that VBNC C. sakazakii could be a potential risk for infants' health.
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Affiliation(s)
- Aidi Zhou
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Wu Shan Road 483, Guangzhou 510642, PR China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, PR China
| | - Li Wang
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Wu Shan Road 483, Guangzhou 510642, PR China.
| | - Jingfeng Zhang
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Wu Shan Road 483, Guangzhou 510642, PR China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, PR China
| | - Xiaoqing Yang
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Wu Shan Road 483, Guangzhou 510642, PR China
| | - Zhihua Ou
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Wu Shan Road 483, Guangzhou 510642, PR China
| | - Lichao Zhao
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Wu Shan Road 483, Guangzhou 510642, PR China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, PR China.
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Sahra S, Jahangir A, Mobarakai N, Glaser A, Jahangir A, Sharif MA. First case report of acute cholangitis secondary to Cronobacter sakazakii. BMC Infect Dis 2021; 21:493. [PMID: 34044785 PMCID: PMC8161626 DOI: 10.1186/s12879-021-06195-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 05/17/2021] [Indexed: 11/16/2022] Open
Abstract
Introduction Cronobacter sakazakii is an opportunistic Gram-negative, rod-shaped bacterium which may be a causative agent of meningitis in premature infants and enterocolitis and bacteremia in neonates and adults. While there have been multiple cases of C. sakazakii infections, there have been no acute cholangitis cases reported in humans. Case presentation An 81-year-old male with a past medical history of basal cell carcinoma, alcoholic liver cirrhosis, transjugular intrahepatic portosystemic shunt procedure, complicated by staphylococcus bacteremia, pituitary tumor, glaucoma, and hypothyroidism presented to the emergency room with the complaint of diffuse and generalized 10/10 abdominal pain of 1 day’s duration. There was a concern for pancreatitis, acute cholangitis, and possible cholecystitis, and the patient underwent a percutaneous cholecystostomy tube placement. Blood cultures from admission and biliary fluid cultures both grew C. sakazakii. The patient was treated with a carbapenem and clinically improved. Conclusions The case study described a patient with multiple medical comorbidities that presented with C. sakazakii bacteremia and cholangitis. While this bacterium has been implicated in other infections, we believe this is the first time the bacteria is being documented to have caused acute cholangitis.
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Affiliation(s)
- Syeda Sahra
- Staten Island University Hospital, 475-Seaview Avenue, Staten Island, NY, 10305, USA.
| | - Abdullah Jahangir
- Staten Island University Hospital, 475-Seaview Avenue, Staten Island, NY, 10305, USA
| | - Neville Mobarakai
- Staten Island University Hospital, 475-Seaview Avenue, Staten Island, NY, 10305, USA
| | - Allison Glaser
- Staten Island University Hospital, 475-Seaview Avenue, Staten Island, NY, 10305, USA
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Lv X, Wang L, Zhang J, He X, Shi L, Zhao L. Quantitative detection of trace VBNC Cronobacter sakazakii by immunomagnetic separation in combination with PMAxx-ddPCR in dairy products. Food Microbiol 2021; 99:103831. [PMID: 34119116 DOI: 10.1016/j.fm.2021.103831] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 05/10/2021] [Accepted: 05/12/2021] [Indexed: 01/20/2023]
Abstract
One immunomagnetic separation (IMS) assay based on immunomagnetic beads (IMBs) has been evaluated as a potential pretreatment tool for the separation and enrichment of target bacteria. In this study, we successfully immobilized antibodies onto magnetic bead surfaces to form IMBs through biotin and a streptavidin (SA) system to capture viable but nonculturable (VBNC) Cronobacter sakazakii (C. sakazakii) from dairy products. Various parameters that affected the capture efficiency (CE) of IMS, including the number of antibodies, IMBs dose, incubation time, magnetic separation time, and immunoreaction temperature, were systematically investigated. We further determined the optimal enrichment conditions for different dairy substrates to ensure maximum enrichment of target pathogens in the system. An IMS technique combining improved propidium monoazide (PMAxx) and droplet digital PCR (ddPCR) was established to detect the pathogenic VBNC C. sakazakii. The IMS-PMAxx-ddPCR method after IMBs enrichment showed higher accuracy when the VBNC C. sakazakii was under 1 Log10 copies/g. The detection limit for this method in a background of powdered infant formula (PIF) was 5.6 copies/g. In summary, the developed IMS-PMAxx-ddPCR method has great potential for the analysis and detection of VBNC bacteria in food.
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Affiliation(s)
- Xinrui Lv
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, China
| | - Li Wang
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, China
| | - Jingfeng Zhang
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, China
| | - Xiaoxin He
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, China
| | - Lei Shi
- Institute of Food Safety and Nutrition, Jinan University, Guangzhou, 510632, China.
| | - Lichao Zhao
- Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods, College of Food Science, South China Agricultural University, Guangzhou, 510642, China.
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Modernization of Control of Pathogenic Micro-Organisms in the Food-Chain Requires a Durable Role for Immunoaffinity-Based Detection Methodology-A Review. Foods 2021; 10:foods10040832. [PMID: 33920486 PMCID: PMC8069916 DOI: 10.3390/foods10040832] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 03/28/2021] [Accepted: 04/02/2021] [Indexed: 01/03/2023] Open
Abstract
Food microbiology is deluged by a vastly growing plethora of analytical methods. This review endeavors to color the context into which methodology has to fit and underlines the importance of sampling and sample treatment. The context is that the highest risk of food contamination is through the animal and human fecal route with a majority of foodborne infections originating from sources in mass and domestic kitchens at the end of the food-chain. Containment requires easy-to-use, failsafe, single-use tests giving an overall risk score in situ. Conversely, progressive food-safety systems are relying increasingly on early assessment of batches and groups involving risk-based sampling, monitoring environment and herd/flock health status, and (historic) food-chain information. Accordingly, responsible field laboratories prefer specificity, multi-analyte, and high-throughput procedures. Under certain etiological and epidemiological circumstances, indirect antigen immunoaffinity assays outperform the diagnostic sensitivity and diagnostic specificity of e.g., nucleic acid sequence-based assays. The current bulk of testing involves therefore ante- and post-mortem probing of humoral response to several pathogens. In this review, the inclusion of immunoglobulins against additional invasive micro-organisms indicating the level of hygiene and ergo public health risks in tests is advocated. Immunomagnetic separation, immunochromatography, immunosensor, microsphere array, lab-on-a-chip/disc platforms increasingly in combination with nanotechnologies, are discussed. The heuristic development of portable and ambulant microfluidic devices is intriguing and promising. Tant pis, many new platforms seem unattainable as the industry standard. Comparability of results with those of reference methods hinders the implementation of new technologies. Whatever the scientific and technological excellence and incentives, the decision-maker determines this implementation after weighing mainly costs and business risks.
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Isolation and Identification of Cronobacter spp. from Fish and Shellfish Sold in Retail Markets. Curr Microbiol 2021; 78:1973-1980. [PMID: 33774683 DOI: 10.1007/s00284-021-02447-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 03/10/2021] [Indexed: 10/21/2022]
Abstract
In this study, we investigated the incidence of Cronobacter spp. in seafood collected from retail fish markets of Mumbai, India. A total of 50 samples comprising fresh finfish (n = 32), shellfish (n = 6), dried fish (n = 9) and water (n = 3) were analyzed for Cronobacter spp. by selective enrichment, isolation and biochemical tests. Of 145 isolates presumptively identified as Cronobacter spp. by biochemical tests, 37 were confirmed as Cronobacter spp. by Polymerase Chain Reaction (PCR) specific to the internal transcribed spacer (ITS) regions. Based on the partial ITS gene sequence analysis, 35 isolates were identified as Cronobacter malonaticus and two as Cronobacter sakazakii. The highest incidence of Cronobacter spp. was in dried fish (55.6%), followed by shellfish (33.3%). The virulence gene ompA was detected in two Cronobacter sakazakii isolates. This is the first report of the incidence of Cronobacter spp. in fresh and dried seafood from India, which highlights the need to focus on this emerging pathogen in tropical seafood.
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Xu Z, Liu Z, Soteyome T, Hua J, Zhang L, Yuan L, Ye Y, Cai Z, Yang L, Chen L, Harro JM, Kjellerup BV, Liu J, Li Y. Impact of pmrA on Cronobacter sakazakii planktonic and biofilm cells: A comprehensive transcriptomic study. Food Microbiol 2021; 98:103785. [PMID: 33875213 DOI: 10.1016/j.fm.2021.103785] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 12/30/2020] [Accepted: 03/05/2021] [Indexed: 10/21/2022]
Abstract
Cronobacter sakazakii is an emerging opportunistic foodborne pathogen causing rare but severe infections in neonates. Furthermore, the formation of biofilm allows C. sakazakii to persist in different environments. We have demonstrated that the mutator phenotype ascribed to deficiency of the pmrA gene results in more biomass in the first 24 h but less during the post maturation stage (7-14 d) compared with BAA 894. The present study aimed to investigate the regulatory mechanism modulating biofilm formation due to pmrA mutation. The transcriptomic analyses of BAA 894 and s-3 were performed by RNA-sequencing on planktonic and biofilm cells collected at different time points. According to the results, when comparing biofilm to planktonic cells, expression of genes encoding outer membrane proteins, lysozyme, etc. were up-regulated, with LysR family transcriptional regulators, periplasmic proteins, etc. down-regulated. During biofilm formation, cellulose synthase operon genes, flagella-related genes, etc. played essential roles in different stages. Remarkably, pmrA varies the expression of a number of genes related to motility, biofilm formation, and antimicrobial resistance, including srfB, virK, mviM encoding virulence factor, flgF, fliN, etc. encoding flagellar assembly, and marA, ramA, etc. encoding AraC family transcriptional regulators in C. sakazakii. This study provides valuable insights into transcriptional regulation of C. sakazakii pmrA mutant during biofilm formation.
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Affiliation(s)
- Zhenbo Xu
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, 510640, China; Department of Clinical Pharmacy and Translational Science, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, 38103, USA; Home Economics Technology, Rajamangala University of Technology Phra Nakhon, Bangkok, Thailand; National Institute of Fundamental Studies, Hantana Road, Kandy, Sri Lanka; Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou, 510640, China
| | - Ziqi Liu
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, 510640, China
| | - Thanapop Soteyome
- National Institute of Fundamental Studies, Hantana Road, Kandy, Sri Lanka
| | - Jingjing Hua
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China
| | - Liang Zhang
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, 214122, China.
| | - Lei Yuan
- College of Food Science and Engineering, Yangzhou University, Yangzhou, China
| | - Yanrui Ye
- School of Biological Science and Engineering, South China University of Technology, Guangzhou, 510640, China
| | - Zhao Cai
- School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, China
| | - Liang Yang
- School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, China
| | - Ling Chen
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou, 510640, China
| | - Janette M Harro
- Department of Microbial Pathogenesis, School of Dentistry, University of Maryland, Baltimore, MD, 21201, USA
| | - Birthe Veno Kjellerup
- Department of Civil and Environmental Engineering, University of Maryland, College Park, MD, 20742, USA
| | - Junyan Liu
- Department of Civil and Environmental Engineering, University of Maryland, College Park, MD, 20742, USA
| | - Yanyan Li
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, 18 Shilongshan Road, Xihu District, Hangzhou, 310024, Zhejiang Province, China.
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Kim SH, Chelliah R, Ramakrishnan SR, Perumal AS, Bang WS, Rubab M, Daliri EBM, Barathikannan K, Elahi F, Park E, Jo HY, Hwang SB, Oh DH. Review on Stress Tolerance in Campylobacter jejuni. Front Cell Infect Microbiol 2021; 10:596570. [PMID: 33614524 PMCID: PMC7890702 DOI: 10.3389/fcimb.2020.596570] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 12/03/2020] [Indexed: 01/17/2023] Open
Abstract
Campylobacter spp. are the leading global cause of bacterial colon infections in humans. Enteropathogens are subjected to several stress conditions in the host colon, food complexes, and the environment. Species of the genus Campylobacter, in collective interactions with certain enteropathogens, can manage and survive such stress conditions. The stress-adaptation mechanisms of Campylobacter spp. diverge from other enteropathogenic bacteria, such as Escherichia coli, Salmonella enterica serovar Typhi, S. enterica ser. Paratyphi, S. enterica ser. Typhimurium, and species of the genera Klebsiella and Shigella. This review summarizes the different mechanisms of various stress-adaptive factors on the basis of species diversity in Campylobacter, including their response to various stress conditions that enhance their ability to survive on different types of food and in adverse environmental conditions. Understanding how these stress adaptation mechanisms in Campylobacter, and other enteric bacteria, are used to overcome various challenging environments facilitates the fight against resistance mechanisms in Campylobacter spp., and aids the development of novel therapeutics to control Campylobacter in both veterinary and human populations.
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Affiliation(s)
- Se-Hun Kim
- Food Microbiology Division, Food Safety Evaluation Department, National Institute of Food and Drug Safety Evaluation, Cheongju, South Korea.,College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, South Korea
| | - Ramachandran Chelliah
- College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, South Korea
| | - Sudha Rani Ramakrishnan
- School of Food Science, Department of Food Science and Biotechnology, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, South Korea
| | | | - Woo-Suk Bang
- Department of Food and Nutrition, College of Human Ecology and Kinesiology, Yeungnam University, Gyeongsan, South Korea
| | - Momna Rubab
- College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, South Korea
| | - Eric Banan-Mwine Daliri
- College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, South Korea
| | - Kaliyan Barathikannan
- College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, South Korea
| | - Fazle Elahi
- College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, South Korea
| | - Eunji Park
- College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, South Korea
| | - Hyeon Yeong Jo
- College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, South Korea
| | - Su-Bin Hwang
- College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, South Korea
| | - Deog Hwan Oh
- College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, South Korea
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Anforderungen an die Infektionsprävention bei der medizinischen Versorgung von immunsupprimierten Patienten. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz 2021; 64:232-264. [PMID: 33394069 PMCID: PMC7780910 DOI: 10.1007/s00103-020-03265-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Yu Z, Joossens M, Kerkhof PJ, Houf K. Bacterial shifts on broiler carcasses at retail upon frozen storage. Int J Food Microbiol 2021; 340:109051. [PMID: 33485099 DOI: 10.1016/j.ijfoodmicro.2021.109051] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 12/21/2020] [Accepted: 01/06/2021] [Indexed: 01/18/2023]
Abstract
Freezing broiler carcasses, industrially or at home, not only delays spoilage, but also is expected to increase food safety by hampering growth of food pathogens. However, detailed knowledge on microbial changes after a short or longer freezing period of fresh broiler meat in home freezing setting is lacking and no comparison between different freezing periods has been published yet. The present study combined classical isolation techniques and identification by MALDI-TOF MS with 16S rRNA amplicon sequencing to assess bacterial contamination on broiler carcasses that were either bought fresh and then frozen for short periods (total n = 20) in home freezing, or industrial frozen one (total n = 4) at retail. Changes in total aerobic bacteria (TAB) were also studied on 78 freshly bought broiler carcasses that were then stored frozen for up to 6 months in domestic freezers. Salmonella and Campylobacter were examined to assess the effect of freezing on controlling common foodborne pathogens. The contamination level of mesophilic and psychrotrophic TAB was numerically equal on carcasses at retail, either fresh or frozen at different time points. After short and long freezing period, a decrease in counts of mesophilic TAB was observed, while changes in counts of psychrotrophic TAB were rarely observed. No correlation between home freezing period and TAB load, either mesophilic (R = -0.006, p = 0.949) or psychrotrophic (R = 0.080, p = 0.389), was observed. No Salmonella and Campylobacter was detected on industrial frozen carcasses but on fresh carcasses at retail, either pre-freezing or after freezing. The bacterial communities were influenced by freezing, in which some genera showed significantly changes in relative abundance after freezing. In conclusion, from a food safety point of view, freezing of meat products does not serve as safety hurdle, and freezing should only be considered as a method for extending shelf life compared with fresh chicken meat. Applying hygienic slaughter procedures to keep the initial contamination as low as possible, and the maintenance of the cold chain during further processing are the key factors in food safety.
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Affiliation(s)
- Zhongjia Yu
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Marie Joossens
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Karel Lodewijk Ledeganckstraat 35, Ghent, Belgium
| | - Pieter-Jan Kerkhof
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Kurt Houf
- Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium; Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Karel Lodewijk Ledeganckstraat 35, Ghent, Belgium.
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Al-Maawali SS, Al-Sadi AM, Ali Khalifa Alsheriqi S, Nasser Al-Sabahi J, Velazhahan R. The potential of antagonistic yeasts and bacteria from tomato phyllosphere and fructoplane in the control of Alternaria fruit rot of tomato. ALL LIFE 2020. [DOI: 10.1080/26895293.2020.1858975] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Affiliation(s)
- Samiya Saleh Al-Maawali
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat, Sultanate of Oman
| | - Abdullah Mohammed Al-Sadi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat, Sultanate of Oman
| | - Salama Ali Khalifa Alsheriqi
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat, Sultanate of Oman
| | - Jamal Nasser Al-Sabahi
- Central Instrument Laboratory, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat, Sultanate of Oman
| | - Rethinasamy Velazhahan
- Department of Plant Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Al-Khoud, Muscat, Sultanate of Oman
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Polat Yemiş G, Delaquis P. Natural Compounds With Antibacterial Activity Against Cronobacter spp. in Powdered Infant Formula: A Review. Front Nutr 2020; 7:595964. [PMID: 33330595 PMCID: PMC7731913 DOI: 10.3389/fnut.2020.595964] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 10/08/2020] [Indexed: 12/15/2022] Open
Abstract
Bacteria from the genus Cronobacter are opportunistic foodborne pathogens capable of causing severe infections in neonates, the elderly and immunocompromised adults. The majority of neonatal infections have been linked epidemiologically to dehydrated powdered infant formulas (PIFs), the majority of which are manufactured using processes that do not ensure commercial sterility. Unfortunately, the osmotolerance, desiccation resistance, mild thermotolerance and wide-ranging minimum, optimum and maximum growth temperatures of Cronobacter spp. are conducive to survival and/or growth during the processing, reconstitution and storage of reconstituted PIFs. Consequently, considerable research has been directed at the development of alternative strategies for the control of Cronobacter spp. in PIFs, including approaches that employ antimicrobial compounds derived from natural sources. The latter include a range of phytochemicals ranging from crude extracts or essential oils derived from various plants (e.g., thyme, cinnamon, clove, marjoram, cumin, mint, fennel), to complex polyphenolic extracts (e.g., muscadine seed, pomegranate peel, olive oil, and cocoa powder extracts), purified simple phenolic compounds (e.g., carvacrol, citral, thymol, eugenol, diacetyl, vanillin, cinnamic acid, trans-cinnamaldehyde, ferulic acid), and medium chain fatty acids (monocaprylin, caprylic acid). Antimicrobials derived from microbial sources (e.g., nisin, other antibacterial peptides, organic acids, coenzyme Q0) and animal sources (e.g., chitosan, lactoferrin, antibacterial peptides from milk) have also been shown to exhibit antibacterial activity against the species. The selection of antimicrobials for the control of Cronobacter spp. requires an understanding of activity at different temperatures, knowledge about their mode of action, and careful consideration for toxicological and nutritional effects on neonates. Consequently, the purpose of the present review is to provide a comprehensive summary of currently available data pertaining to the antibacterial effects of natural antimicrobial compounds against Cronobacter spp. with a view to provide information needed to inform the selection of compounds suitable for control of the pathogen during the manufacture or preparation of PIFs by end users.
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Affiliation(s)
- Gökçe Polat Yemiş
- Department of Food Engineering, Sakarya University, Serdivan, Turkey
| | - Pascal Delaquis
- Summerland Research and Development Research Centre, Agriculture and AgriFood Canada, Summerland, BC, Canada
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Chauhan R, Singh N, Pal GK, Goel G. Trending biocontrol strategies against Cronobacter sakazakii: A recent updated review. Food Res Int 2020; 137:109385. [DOI: 10.1016/j.foodres.2020.109385] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Revised: 05/27/2020] [Accepted: 06/02/2020] [Indexed: 12/29/2022]
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Bifidobacteriumlongum subsp. infantis CECT7210 ( B. infantis IM-1 ®) Displays In Vitro Activity against Some Intestinal Pathogens. Nutrients 2020; 12:nu12113259. [PMID: 33114404 PMCID: PMC7693895 DOI: 10.3390/nu12113259] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/25/2020] [Accepted: 10/21/2020] [Indexed: 02/06/2023] Open
Abstract
Certain non-digestible oligosaccharides (NDO) are specifically fermented by bifidobacteria along the human gastrointestinal tract, selectively favoring their growth and the production of health-promoting metabolites. In the present study, the ability of the probiotic strain Bifidobacterium longum subsp. infantis CECT7210 (herein referred to as B. infantis IM-1®) to utilize a large range of oligosaccharides, or a mixture of oligosaccharides, was investigated. The strain was able to utilize all prebiotics screened. However, galactooligosaccharides (GOS), and GOS-containing mixtures, effectively increased its growth to a higher extent than the other prebiotics. The best synbiotic combination was used to examine the antimicrobial activity against Escherichia coli, Cronobacter sakazakii, Listeria monocytogenes and Clostridium difficile in co-culture experiments. C. difficile was inhibited by the synbiotic, but it failed to inhibit E. coli. Moreover, Cr. sakazakii growth decreased during co-culture with B. infantis IM-1®. Furthermore, adhesion experiments using the intestinal cell line HT29 showed that the strain IM-1® was able to displace some pathogens from the enterocyte layer, especially Cr. sakazakii and Salmonella enterica, and prevented the adhesion of Cr. sakazakii and Shigella sonnei. In conclusion, a new synbiotic (probiotic strain B. infantis IM-1® and GOS) appears to be a potential effective supplement for maintaining infant health. However, further studies are needed to go more deeply into the mechanisms that allow B.infantis IM-1® to compete with enteropathogens.
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Evaluating of Phage as Bio-control Agent in Enumeration of Food Borne Pathogenic Pseudomonas aeruginosa. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2020. [DOI: 10.22207/jpam.14.3.52] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Phage acts as a bio-controlling agent to overcome chemical supplement in the treatment food pathogens. Bacterial pathogens mainly cause food borne diseases; these are harmful to human health and also threat to nutritional economy. Due to aggregating in the multidrug resistance among the pathogens, the conventional methods for food safety are drawn in the use of chemicals and causes toxicity. In our present study, the P. aeruginosa isolates were determined from food samples on specific Cetrimide agar and a specific phage was isolated against the strain. The microbial enumeration growth was carried out on meat samples. The preservative activity was performed on banana samples. The present phage has indicated a prominent agent in enumeration of microbial growth against meat and mutton samples. It also showed a quality preservative for storage in banana samples. The potential advantage of using phage is their specificity and ability to multiply; hence, it can be used in food safety and provide a natural alternative to conventional synthetic preservatives used in food industries. The phage has ability in decreasing the growth microbes in food samples and long storage as preservative in fruits.
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