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Fang F, Xue Y, Xu X, Fang D, Liu W, Zhong Y, Han J, Li Y, Tao Q, Lu R, Ma C, Kumar A, Wang D. L-glutamine protects against enterohemorrhagic Escherichia coli infection by inhibiting bacterial virulence and enhancing host defense concurrently. Microbiol Spectr 2023; 11:e0097523. [PMID: 37815335 PMCID: PMC10714755 DOI: 10.1128/spectrum.00975-23] [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: 03/07/2023] [Accepted: 08/24/2023] [Indexed: 10/11/2023] Open
Abstract
IMPORTANCE The type 3 secretion system (T3SS) was obtained in many Gram-negative bacterial pathogens, and it is crucial for their pathogenesis. Environmental signals were found to be involved in the expression regulation of T3SS, which was vital for successful bacterial infection in the host. Here, we discovered that L-glutamine (Gln), the most abundant amino acid in the human body, could repress enterohemorrhagic Escherichia coli (EHEC) T3SS expression via nitrogen metabolism and therefore had potential as an antivirulence agent. Our in vitro and in vivo evidence demonstrated that Gln could decline EHEC infection by attenuating bacterial virulence and enhancing host defense simultaneously. We repurpose Gln as a potential treatment for EHEC infection accordingly.
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Affiliation(s)
- Fang Fang
- Department of Laboratory Medicine, Xiamen Key Laboratory of Perinatal-Neonatal Infection, Women and Children's Hospital, State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedical Laboratory, School of Public Health and School of Medicine, Xiamen University, Xiamen, Fujian Province, China
| | - Yunxin Xue
- Department of Laboratory Medicine, Xiamen Key Laboratory of Perinatal-Neonatal Infection, Women and Children's Hospital, State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedical Laboratory, School of Public Health and School of Medicine, Xiamen University, Xiamen, Fujian Province, China
| | - Xuefang Xu
- State Key Laboratory of Infectious Disease Prevention and Control and National Institute for Communicable Diseases Control and Prevention, Chinese Center for Disease Control and Prevention, Changping, Beijing, China
| | - Dingli Fang
- Department of Laboratory Medicine, Xiamen Key Laboratory of Perinatal-Neonatal Infection, Women and Children's Hospital, State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedical Laboratory, School of Public Health and School of Medicine, Xiamen University, Xiamen, Fujian Province, China
| | - Weijia Liu
- Department of Laboratory Medicine, Xiamen Key Laboratory of Perinatal-Neonatal Infection, Women and Children's Hospital, State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedical Laboratory, School of Public Health and School of Medicine, Xiamen University, Xiamen, Fujian Province, China
| | - Ying Zhong
- Department of Laboratory Medicine, Xiamen Key Laboratory of Perinatal-Neonatal Infection, Women and Children's Hospital, State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedical Laboratory, School of Public Health and School of Medicine, Xiamen University, Xiamen, Fujian Province, China
| | - Jinping Han
- Department of Laboratory Medicine, Xiamen Key Laboratory of Perinatal-Neonatal Infection, Women and Children's Hospital, State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedical Laboratory, School of Public Health and School of Medicine, Xiamen University, Xiamen, Fujian Province, China
| | - Yunhe Li
- Department of Laboratory Medicine, Xiamen Key Laboratory of Perinatal-Neonatal Infection, Women and Children's Hospital, State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedical Laboratory, School of Public Health and School of Medicine, Xiamen University, Xiamen, Fujian Province, China
| | - Qian Tao
- Department of Pathology, Women and Children's Hospital, State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Innovation Platform for Industry-Education Integration in Vaccine Research, Xiamen University, Xiamen, Fujian Province, China
| | - Rong Lu
- Department of Laboratory Medicine, Xiamen Key Laboratory of Perinatal-Neonatal Infection, Women and Children's Hospital, State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedical Laboratory, School of Public Health and School of Medicine, Xiamen University, Xiamen, Fujian Province, China
| | - Cong Ma
- Department of Nephrology, Lishan Hospital, Anshan Central Hospital, Anshan, Liaoning Province, China
| | | | - Dai Wang
- Department of Laboratory Medicine, Xiamen Key Laboratory of Perinatal-Neonatal Infection, Women and Children's Hospital, State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedical Laboratory, School of Public Health and School of Medicine, Xiamen University, Xiamen, Fujian Province, China
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Ajuwon BI, Babatunde SK, Kolawole OM, Ajiboye AE, Lawal AH. Prevalence and antibiotic resistance of Escherichia coli O157:H7 in beef at a commercial slaughterhouse in Moro, Kwara State, Nigeria. Access Microbiol 2021; 3:000289. [PMID: 35018331 PMCID: PMC8742587 DOI: 10.1099/acmi.0.000289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 09/26/2021] [Indexed: 12/03/2022] Open
Abstract
Background Gastroenteritis due to foodborne disease is a leading cause of death in developing countries. In Nigeria, there is an increasing demand for beef. Yet, there is no surveillance for Escherichia coli O157:H7 contamination of raw beef and little is known about the carriage of this pathogen in Nigeria’s livestock. Methods A total of 415 samples, including 180 cow carcass swabs, 180 caecal content samples, 16 water samples, 25 hand swabs and 14 knife swabs were collected at a large abattoir in the Moro region of Kwara State, Nigeria. The samples were enriched in modified tryptone broth containing novobiocine, and plated onto Sorbitol–MacConkey agar (Oxoid SR0172E) supplemented with 0.05 mg l−1 cefixime and 2.5 mg l−1 potassium tellurite (Oxoid) (CT-SMAC). Indole-producing isolates were confirmed serologically by serotyping with antisera specific for the O157 and H7 antigens. The E. coli O157:H7 isolates were further tested for their susceptibility to antibiotic agents using the disc diffusion method. Commercially available Gram-negative multi-discs (Oxoid) comprising nitrofurantoin (30 µg), ampicillin (5 µg), ceftazidime (30 µg), gentamicin (10 µg), ciprofloxacin (5 µg), augmentin (30 µg), ofloxacin (5 µg) and cefuroxime (30 µg) were tested. Results Overall, 16 (3.9 %) samples were contaminated with E. coli O157:H7, of which 10 (5.6 %) were isolated from carcass swabs, 4 (2.2 %) from caecal content samples and 2 (12.5 %) from water. All isolates were multidrug-resistant (MDR), with resistance to ampicillin, ceftazidime and cefuroxime being the most common. Conclusion This study provides evidence to suggest that E. coli O157:H7 exists in the beef production chain. The pathogen reveals a high frequency of multidrug resistance, suggesting that consumers and handlers of such meat are at risk of contracting antibiotic-resistant E. coli O157:H7-associated foodborne disease. Routine monitoring of antibiotic resistance is critical to uncovering novel therapeutic strategies that will help inform clinical practice guidelines.
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Affiliation(s)
- Busayo I. Ajuwon
- National Centre for Epidemiology and Population Health, Research School of Population Health, College of Health and Medicine, The Australian National University, Canberra, ACT 2601, Australia
- Department of Biosciences and Biotechnology, Faculty of Pure and Applied Sciences, Kwara State University, Malete, Nigeria
| | - Sola K. Babatunde
- Department of Natural and Environmental Sciences, Faculty of Science, Crown-Hill University, Ilorin, Kwara State, Nigeria
| | - Olatunji M. Kolawole
- Department of Microbiology, Faculty of Life Sciences, University of Ilorin, Ilorin, Nigeria
| | - Adeyinka E. Ajiboye
- Department of Biosciences and Biotechnology, Faculty of Pure and Applied Sciences, Kwara State University, Malete, Nigeria
| | - Abosede H. Lawal
- Centre for Occupational and Environmental Public Health, Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
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Su Z, Tong P, Zhang L, Zhang M, Wang D, Ma K, Zhang Y, Liu Y, Xia L, Xie J. First Isolation and Molecular Characterization of bla CTX-M-121 -Producing Escherichia coli O157:H7 From Cattle in Xinjiang, China. Front Vet Sci 2021; 8:574801. [PMID: 34113667 PMCID: PMC8185162 DOI: 10.3389/fvets.2021.574801] [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: 06/25/2020] [Accepted: 04/12/2021] [Indexed: 01/09/2023] Open
Abstract
The bovine Escherichia coli O157:H7 is a major foodborne pathogen causing severe bloody diarrhea, hemorrhagic colitis, and hemolytic uremic syndrome in humans. Cattle are recognized major reservoir and source of E. coli O157:H7. We investigated the antibiotic resistance, molecular profiles, and intrinsic relationship between 21 isolates of E. coli O157:H7 from cattle farms and slaughtering houses in Xinjiang. Using pulsed-field gel electrophoresis (PFGE) molecular typing, two types of PFGE were revealed through cluster analysis, including clusters I and II, with 66 and 100% similarity of PFGE spectra between 21 isolates. We also detected that 18 isolates (86%) carried at least one virulence gene, 16 isolates (76%) carried the eae gene, and 7 (33%) carried the stx1 + stx2 + eae + hly + tccp genes. Eighteen isolates were susceptible to antibiotics. Three isolates were resistant to antibiotics, and two were multidrug resistant. One of the two multidrug-resistant isolates detectably carried the bla CTX-M-121 gene. This is the first finding of the bla CTX-M-121 gene detected in E. coli O157:H7 isolated from cattle in Xinjiang. The bla CTX-M-121 gene is transferable between the bacterial strains via plasmid transmission. The results indicated that E. coli O157:H7 may have undergone clonal propagation in cattle population and cross-regional transmission in Xinjiang, China.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Lining Xia
- College of Veterinary Medicine, Xinjiang Agricultural University, Urumqi, China
| | - Jinxin Xie
- College of Veterinary Medicine, Xinjiang Agricultural University, Urumqi, China
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Costa M, Londero A, Brusa V, Galli L, Van Der Ploeg C, Roge A, Leotta GA. Characterization and molecular subtyping of Shiga toxin-producing Escherichia coli strains in provincial abattoirs from the Province of Buenos Aires, Argentina, during 2016-2018. Prev Vet Med 2020; 183:105133. [PMID: 32979660 DOI: 10.1016/j.prevetmed.2020.105133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 08/25/2020] [Accepted: 08/26/2020] [Indexed: 12/01/2022]
Abstract
We characterized Shiga toxin-producing Escherichia coli (STEC) O157 (n = 20) and non-O157 (n = 68) isolated from carcasses (n = 54), the environment (n = 20), head meat (n = 3) and viscera washing and chilling water (n = 11) in provincial abattoirs before and after implementing improvement actions. The strains were tested for eae, saa, ehxA and fliCH7 genes. Variants stx1 and stx2 were also determined. Pulsed-field gel electrophoresis (PFGE) was carried out with restriction enzymes XbaI and BlnI. All twenty O157 STEC strains [H7; H21; HNM] carried genes rfbO157 and ehxA; 90.0 % were positive for eae and 15.0 % were negative for fliCH7 and positive for saa. Results of PFGE showed 17 XbaI patterns, of which 14 were unique and three formed clusters. From the 68 non-O157 STEC strains, 66.2 %, 55.9 % and 2.9 % were positive for ehxA, saa and eae genes, respectively. Fifty-three XbaI patterns were obtained (49 unique and four forming clusters). Cross-contamination between products and between the environment and products was confirmed in all abattoirs. While the proposed improvements reduced the risk of contamination, Good Hygiene Practices and Good Manufacturing Practices should be implemented in provincial abattoirs, stressing the importance of having a uniform national food safety standard.
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Affiliation(s)
- Magdalena Costa
- IGEVET - Instituto de Genética Veterinaria "Ing. Fernando N. Dulout" (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias Av. 60 y 118 s/n. CC 296 UNLP (1900), La Plata, Buenos Aires, Argentina.
| | - Alejandra Londero
- IGEVET - Instituto de Genética Veterinaria "Ing. Fernando N. Dulout" (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias Av. 60 y 118 s/n. CC 296 UNLP (1900), La Plata, Buenos Aires, Argentina
| | - Victoria Brusa
- IGEVET - Instituto de Genética Veterinaria "Ing. Fernando N. Dulout" (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias Av. 60 y 118 s/n. CC 296 UNLP (1900), La Plata, Buenos Aires, Argentina
| | - Lucía Galli
- IGEVET - Instituto de Genética Veterinaria "Ing. Fernando N. Dulout" (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias Av. 60 y 118 s/n. CC 296 UNLP (1900), La Plata, Buenos Aires, Argentina
| | - Claudia Van Der Ploeg
- Servicio Antígenos y Antisueros, Instituto Nacional de Producción de Biológicos, Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán", Av. Vélez Sarsfield 563, (1282), Buenos Aires, Argentina
| | - Ariel Roge
- Servicio Antígenos y Antisueros, Instituto Nacional de Producción de Biológicos, Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán", Av. Vélez Sarsfield 563, (1282), Buenos Aires, Argentina
| | - Gerardo A Leotta
- IGEVET - Instituto de Genética Veterinaria "Ing. Fernando N. Dulout" (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias Av. 60 y 118 s/n. CC 296 UNLP (1900), La Plata, Buenos Aires, Argentina
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