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Bhowmick J, Nag M, Ghosh P, Rajmani RS, Chatterjee R, Karmakar K, Chandra K, Chatterjee J, Chakravortty D, Varadarajan R. A CcdB toxin-derived peptide acts as a broad-spectrum antibacterial therapeutic in infected mice. EMBO Rep 2023; 24:e55338. [PMID: 37166011 PMCID: PMC10328072 DOI: 10.15252/embr.202255338] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Revised: 04/16/2023] [Accepted: 04/21/2023] [Indexed: 05/12/2023] Open
Abstract
The bacterial toxin CcdB (Controller of Cell death or division B) targets DNA Gyrase, an essential bacterial topoisomerase, which is also the molecular target for fluoroquinolones. Here, we present a short cell-penetrating 24-mer peptide, CP1-WT, derived from the Gyrase-binding region of CcdB and examine its effect on growth of Escherichia coli, Salmonella Typhimurium, Staphylococcus aureus and a carbapenem- and tigecycline-resistant strain of Acinetobacter baumannii in both axenic cultures and mouse models of infection. The CP1-WT peptide shows significant improvement over ciprofloxacin in terms of its in vivo therapeutic efficacy in treating established infections of S. Typhimurium, S. aureus and A. baumannii. The molecular mechanism likely involves inhibition of Gyrase or Topoisomerase IV, depending on the strain used. The study validates the CcdB binding site on bacterial DNA Gyrase as a viable and alternative target to the fluoroquinolone binding site.
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Grants
- Department of Biotechnology, Ministry of Science and Technology, India - Indian Institute of Science (DBT-IISc) partnership program
- BT/COE/34/SP15219/2015 Department of Biotechnology, Ministry of Science and Technology, India
- DT.20/11/2015 Department of Biotechnology, Ministry of Science and Technology, India
- Department of Science and Technology, Ministry of Science and Technology, India (DST FIST)
- Ministry of Education, India (MHRD)
- University Grants Commission, Ministry of Education, India (UGC Centre for Advanced Studies)
- Department of Biotechnology, Ministry of Science and Technology, India
- Ministry of Education, India (MHRD)
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Affiliation(s)
- Jayantika Bhowmick
- Molecular Biophysics Unit (MBU)Indian Institute of ScienceBangaloreIndia
| | - Manish Nag
- Molecular Biophysics Unit (MBU)Indian Institute of ScienceBangaloreIndia
| | - Pritha Ghosh
- Molecular Biophysics Unit (MBU)Indian Institute of ScienceBangaloreIndia
| | - Raju S Rajmani
- Molecular Biophysics Unit (MBU)Indian Institute of ScienceBangaloreIndia
| | - Ritika Chatterjee
- Department of Microbiology and Cell BiologyIndian Institute of ScienceBangaloreIndia
| | - Kapudeep Karmakar
- Department of Microbiology and Cell BiologyIndian Institute of ScienceBangaloreIndia
| | - Kasturi Chandra
- Department of Microbiology and Cell BiologyIndian Institute of ScienceBangaloreIndia
| | - Jayanta Chatterjee
- Molecular Biophysics Unit (MBU)Indian Institute of ScienceBangaloreIndia
| | - Dipshikha Chakravortty
- Department of Microbiology and Cell BiologyIndian Institute of ScienceBangaloreIndia
- School of BiologyIndian Institute of Science Education and Research Thiruvananthapuram (IISER TVM)ThiruvananthapuramIndia
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Almehdar HA, Abd El-Baky N, Mattar EH, Albiheyri R, Bamagoos A, Aljaddawi A, Uversky VN, Redwan EM. Exploring the mechanisms by which camel lactoferrin can kill Salmonella enterica serovar typhimurium and Shigella sonnei. PeerJ 2023; 11:e14809. [PMID: 36743956 PMCID: PMC9893911 DOI: 10.7717/peerj.14809] [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: 09/15/2022] [Accepted: 01/05/2023] [Indexed: 01/31/2023] Open
Abstract
There is a continuously increasing pressure associated with the appearance of Salmonella enterica Serovar typhimurium (S. typhimurium) and Shigella sonnei (S. sonnei) that have developed pathogenic multiple antibiotic resistance and the cost of cure and control of these enterobacteriaceae infections increases annually. The current report for first time demonstrated the distinguished antimicrobial action of camel lactoferrin (cLf) obtained from the milk of different clans of camel in Saudi Arabia against S. typhimurium and S. sonnei. These cLf subtypes showed comparable antimicrobial potential when tested against the two bacterial strains but were superior to either bovine (bLf) or human lactoferrin (hLf). The synergism between lactoferrins and antibiotics concerning their antibacterial efficacies against the two bacterial strains was evident. Exploring mechanisms by which camel lactoferrin can kill S. typhimurium and S. sonnei revealed that cLf affects bacterial protein profile. Besides, it interacts with bacterial lipopolysaccharides (LPS) and numerous membrane proteins of S. typhimurium and S. sonnei, with each bacterial strain possessing distinctive binding membrane proteins for lactoferrin. Furthermore, as evidenced by electron microscopy analysis, cLf induces extracellular and intracellular morphological changes in the test bacterial strains when used alone or in combination treatment with antibiotics. Lactoferrin and antibiotics combination strongly disrupts the integrity of the bacterial cells and their membranes. Therefore, cLf can kill S. typhimurium and S. sonnei by four different mechanisms, such as iron chelation, affecting some bacterial proteins, binding to bacterial LPS and membrane proteins, and impairing the integrity of the bacterial cells and their membranes.
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Affiliation(s)
- Hussein A. Almehdar
- Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Nawal Abd El-Baky
- Therapeutic and Protective Proteins Laboratory, Protein Research Department, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications, Alexandria, Egypt
| | - Ehab H. Mattar
- Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Raed Albiheyri
- Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Atif Bamagoos
- Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Abdullah Aljaddawi
- Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Vladimir N. Uversky
- Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia,Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, United States of America
| | - Elrashdy M. Redwan
- Department of Biological Sciences, Faculty of Sciences, King Abdulaziz University, Jeddah, Saudi Arabia,Therapeutic and Protective Proteins Laboratory, Protein Research Department, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications, Alexandria, Egypt
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Blasey N, Rehrmann D, Riebisch AK, Mühlen S. Targeting bacterial pathogenesis by inhibiting virulence-associated Type III and Type IV secretion systems. Front Cell Infect Microbiol 2023; 12:1065561. [PMID: 36704108 PMCID: PMC9872159 DOI: 10.3389/fcimb.2022.1065561] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Accepted: 12/19/2022] [Indexed: 01/12/2023] Open
Abstract
Infections caused by Gram-negative pathogens pose a major health burden. Both respiratory and gastrointestinal infections are commonly associated with these pathogens. With the increase in antimicrobial resistance (AMR) over the last decades, bacterial infections may soon become the threat they have been before the discovery of antibiotics. Many Gram-negative pathogens encode virulence-associated Type III and Type IV secretion systems, which they use to inject bacterial effector proteins across bacterial and host cell membranes into the host cell cytosol, where they subvert host cell functions in favor of bacterial replication and survival. These secretion systems are essential for the pathogens to cause disease, and secretion system mutants are commonly avirulent in infection models. Hence, these structures present attractive targets for anti-virulence therapies. Here, we review previously and recently identified inhibitors of virulence-associated bacterial secretions systems and discuss their potential as therapeutics.
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Lessard M, Talbot G, Bergeron N, Lo Verso L, Morissette B, Yergeau É, Matte JJ, Bissonnette N, Blais M, Gong J, Wang Q, Quessy S, Guay F. Weaning diet supplemented with health-promoting feed additives influences microbiota and immune response in piglets challenged with Salmonella. Vet Immunol Immunopathol 2023; 255:110533. [PMID: 36563567 DOI: 10.1016/j.vetimm.2022.110533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 11/09/2022] [Accepted: 12/06/2022] [Indexed: 12/12/2022]
Abstract
The aim of this study was to evaluate the potential of micronutrients and feed additives to modulate intestinal microbiota and systemic and mucosal immune responses in weaned pigs infected with Salmonella. At weaning, 32 litters of 12 piglets each were allocated to four dietary treatments: 1) control diet (CTRL), 2) CTRL supplemented with chlortetracycline (ATB), 3) CTRL supplemented with a cocktail of feed additives (CKTL); and 4) CKTL diet containing bovine colostrum in replacement of spray-dry animal plasma (CKTL+COL). The CKTL supplement included cranberry extract, encapsulated carvacrol and yeast-derived products and an enriched selenium and vitamin premix. Three weeks after weaning, four pigs per litter were orally inoculated with Salmonella Typhimurium DT104. Half of them were euthanized 3 days post-infection (dpi) and the other half, 7 dpi. The expression of IL6, TNF, IL8, monocyte chemoattractant protein 1 (MCP1), IFNG, cyclooxygenase 2 (COX2), glutathione peroxidase 2 (GPX2) and β-defensin 2 (DEFB2) showed a peaked response at 3 dpi (P < 0.05). Results also revealed that DEFB2 expression was higher at 3 dpi in CTRL and CKTL groups than in ATB (P = 0.01 and 0.06, respectively) while GPX2 gene was markedly increased at 3 and 7 dpi in pigs fed CKTL or CKTL+COL diet compared to CTRL pigs (P < 0.05). In piglets fed CKTL or CKTL+COL diet, intestinal changes in microbial communities were less pronounced after exposure to Salmonella compared to CTRL and progressed faster toward the status before Salmonella challenge (AMOVA P < 0.01). Furthermore, the relative abundance of several families was either up- or down-regulated in pigs fed CKTL or CKTL+COL diet after Salmonella challenge. In conclusion, weaning diet enriched with bovine colostrum, vitamins and mixture of feed additives mitigated the influence of Salmonella infection on intestinal microbial populations and modulate systemic and intestinal immune defences.
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Affiliation(s)
- Martin Lessard
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC J1M 0C8, Canada; Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine (FMV), Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada; Département de Biologie, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, QC J1K 2R1, Canada; Faculté des sciences de l'agriculture et de l'alimentation, Département de sciences animales, Université Laval, Québec, QC G1V 0A6, Canada
| | - Guylaine Talbot
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC J1M 0C8, Canada; Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine (FMV), Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada; Département de Biologie, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, QC J1K 2R1, Canada.
| | - Nadia Bergeron
- Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine (FMV), Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada
| | - Luca Lo Verso
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC J1M 0C8, Canada; Faculté des sciences de l'agriculture et de l'alimentation, Département de sciences animales, Université Laval, Québec, QC G1V 0A6, Canada
| | - Bruno Morissette
- Département de Biologie, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, QC J1K 2R1, Canada
| | - Étienne Yergeau
- Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine (FMV), Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada; Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique, Université du Québec, Laval, QC, Canada
| | - Jacques J Matte
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC J1M 0C8, Canada
| | - Nathalie Bissonnette
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC J1M 0C8, Canada
| | - Mylène Blais
- Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC J1M 0C8, Canada; Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine (FMV), Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada
| | - Joshua Gong
- Guelph Research and Development Centre, Agriculture and Agri-Food Canada, Guelph, ON N1G 5C9, Canada
| | - Qi Wang
- Guelph Research and Development Centre, Agriculture and Agri-Food Canada, Guelph, ON N1G 5C9, Canada
| | - Sylvain Quessy
- Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine (FMV), Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada
| | - Frédéric Guay
- Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine (FMV), Université de Montréal, St-Hyacinthe, QC J2S 7C6, Canada; Faculté des sciences de l'agriculture et de l'alimentation, Département de sciences animales, Université Laval, Québec, QC G1V 0A6, Canada
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Lactoferrin and Metoprolol Supplementation Increase Mouse Survival in an Experimental LPS-Induced Sepsis Model. Int J Pept Res Ther 2022. [DOI: 10.1007/s10989-022-10447-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Zhang T, Yuan Y, Lu R, Xu S, Zhou M, Yuan T, Lu Y, Yan K, Cheng Y. The goat β‑casein/CMV chimeric promoter drives the expression of hLF in transgenic goats produced by cell transgene microinjection. Int J Mol Med 2019; 44:2057-2064. [PMID: 31661123 PMCID: PMC6844622 DOI: 10.3892/ijmm.2019.4382] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Accepted: 09/05/2019] [Indexed: 12/24/2022] Open
Abstract
There is growing interest in the application of lactoferrin (LF) as a drug or food additive for animals and humans. The objective of this study was to produce transgenic cloned goats that would serve as living bioreactors, expressing high levels of recombinant human LF (rhLF) in their milk. We designed a pCL25 expression vector containing goat β-casein/CMV chimeric promoter in order to facilitate rhLF expression. This pCL25-rhLF-Neo vector was microinjected into goat fetal fibroblasts. G418 selection and PCR analysis were used to identify transgenic donor cells suitable for somatic cell nuclear transfer (SCNT). After SCNT and embryo transplantation, goats harboring the hLF gene were produced, as confirmed via PCR and southern blotting. The average rhLF concentration in milk from this transgenic goat was 3.89 mg/ml as determined via ELISA. We also used an optimized buffer in order to effectively elute high-purity (95.8%) rhLF from a cation-exchange column, with the recovered rhLF exhibiting high biological activity. Findings from this study demonstrated that it is possible to generate a transgenic goat harboring the hLF transgene driven by the goat β-casein/CMV chimeric promoter. It represents an initial step towards the production of rhLF, potentially allowing for industrialized purification in the future.
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Affiliation(s)
- Ting Zhang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
| | - Yuguo Yuan
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
| | - Rui Lu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
| | - Sheng Xu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
| | - Minya Zhou
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
| | - Tingting Yuan
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225001, P.R. China
| | - Yaoyao Lu
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225001, P.R. China
| | - Kunning Yan
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu 225001, P.R. China
| | - Yong Cheng
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
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Straw Wine Melanoidins as Potential Multifunctional Agents: Insight into Antioxidant, Antibacterial, and Angiotensin-I-Converting Enzyme Inhibition Effects. Biomedicines 2018; 6:biomedicines6030083. [PMID: 30072595 PMCID: PMC6163464 DOI: 10.3390/biomedicines6030083] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 07/23/2018] [Accepted: 07/25/2018] [Indexed: 01/17/2023] Open
Abstract
Numerous studies provide robust evidence for a protective effect of red wine against many diseases. This bioactivity has been mainly associated with phenolic fractions of wines. However, the health effects of melanoidins in red sweet wines has been ignored. The goal of the present work was to unravel the antioxidant, antimicrobial, and angiotensin-I-converting enzyme (ACE) inhibitory properties of straw sweet wine melanoidins. Results demonstrated that melanoidins have a potential antioxidant activity, determined by 2,2-Diphenyl-1-picrylhydrazyl (DPPH) and Ferric reducing antioxidant power (FRAP) assays. The antimicrobial activity of melanoidins was also tested against Listeria monocytogenes, Salmonella Enteritidis, and Escherichia coli. Minimum inhibitory concentration (MIC) of isolated melanoidins against three bacterial strains ranged from 5 mg mL−1 to 10 mg mL−1. Finally, the ACE inhibitory effect of isolated melanoidins was evaluated, as it is linked with antihypertensive activity. Results showed that they have ACE-inhibitory activity ranging from 58.2 ± 5.4% to 75.3 ± 6.4% at a concentration level of 2 mg mL−1. Furthermore, the chemical properties of isolated melanoidins were determined. Results demonstrated that the skeleton of straw wine melanoidins is mainly composed of carbohydrates, and bear significant numbers of phenolic compounds that may play critical roles in their functional properties. Overall, this study describing the chemical composition and functional properties of melanoidin fractions isolated from a straw wine highlights that they can be exploited as functional agents for multiple purposes. Finally, melanoidins are an unexplored source of bioactive molecules in straw wines except from polyphenols that contribute to the health effects.
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Drago-Serrano ME, Campos-Rodríguez R, Carrero JC, de la Garza M. Lactoferrin: Balancing Ups and Downs of Inflammation Due to Microbial Infections. Int J Mol Sci 2017; 18:E501. [PMID: 28257033 PMCID: PMC5372517 DOI: 10.3390/ijms18030501] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Revised: 02/13/2017] [Accepted: 02/22/2017] [Indexed: 02/07/2023] Open
Abstract
Lactoferrin (Lf) is a glycoprotein of the primary innate immune-defense system of mammals present in milk and other mucosal secretions. This protein of the transferrin family has broad antimicrobial properties by depriving pathogens from iron, or disrupting their plasma membranes through its highly cationic charge. Noteworthy, Lf also exhibits immunomodulatory activities performing up- and down-regulation of innate and adaptive immune cells, contributing to the homeostasis in mucosal surfaces exposed to myriad of microbial agents, such as the gastrointestinal and respiratory tracts. Although the inflammatory process is essential for the control of invasive infectious agents, the development of an exacerbated or chronic inflammation results in tissue damage with life-threatening consequences. In this review, we highlight recent findings in in vitro and in vivo models of the gut, lung, oral cavity, mammary gland, and liver infections that provide experimental evidence supporting the therapeutic role of human and bovine Lf in promoting some parameters of inflammation and protecting against the deleterious effects of bacterial, viral, fungal and protozoan-associated inflammation. Thus, this new knowledge of Lf immunomodulation paves the way to more effective design of treatments that include native or synthetic Lf derivatives, which may be useful to reduce immune-mediated tissue damage in infectious diseases.
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Affiliation(s)
- Maria Elisa Drago-Serrano
- Departamento de Sistemas Biológicos, Universidad Autónoma Metropolitana Unidad Xochimilco (UAM-X), CdMx 04960, Mexico.
| | - Rafael Campos-Rodríguez
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Medicina, Instituto Politécnico Nacional (ESM-IPN), CdMx 11340, Mexico.
| | - Julio César Carrero
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México (IIB-UNAM), CdMx 70228, Mexico.
| | - Mireya de la Garza
- Departamento de Biología Celular, Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), CdMx 07360, Mexico.
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Wu J, Hu Y, Du C, Piao J, Yang L, Yang X. The effect of recombinant human lactoferrin from the milk of transgenic cows on Salmonella enterica serovar typhimurium infection in mice. Food Funct 2016; 7:308-14. [PMID: 26469086 DOI: 10.1039/c5fo00817d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Lactoferrin (LF) is a multifunctional protein with antibacterial and immunomodulatory activities. Given this beneficial effect, transgenic approaches have been used to produce lactoferrin. The aim of the current study was to investigate the in vivo effect of recombinant human lactoferrin (rhLF) from the milk of transgenic cows on Salmonella enterica serovar typhimurium (ST) infection in mice. Two hours before the infection with 0.3 ml at 2 × 10(5) CFU ml(-1) of ST, each animal in the ST + rhLF group received 0.3 ml of rhLF with 20 mg ml(-1) concentration while the ST group received PBS as placebos with the same volume through oral gavage. The mice were infected with ST once only on the first day. After the infection, the mice received 0.3 ml of rhLF with 20 mg ml(-1) (6 mg d(-1)) concentration or PBS, respectively, for 7 days. Mortality and weight were monitored daily. Bacterial enumeration in the blood, liver, and spleen and histopathological analysis of the liver, spleen, kidney and intestine were conducted. The results showed that rhLF decreased the bacterial load in the liver and spleen of mice, reduced the degree of mice hepatomegaly and splenomegaly, and attenuated infectious inflammation with less histopathological abnormalities in the liver, spleen and kidney of mice in the ST infection. This study showed that rhLF with 6 mg per day had antibacterial activity of alleviating the infection caused by ST bacteria, which indicated that rhLF could be used as a supplement in special products.
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Affiliation(s)
- Jinghuan Wu
- The Key Laboratory of Trace Element Nutrition MOH, National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Room 103, 29 Nan Wei Road, Xicheng District, Beijing 100050, P.R. China.
| | - Yujie Hu
- Foodborne Disease Surveillance Department, China National Center for Food Safety Risk Assessment, 7 Panjiayuan Nanli, Chaoyang District, Beijing, 100050, P.R. China
| | - Chunming Du
- Foodborne Disease Surveillance Department, China National Center for Food Safety Risk Assessment, 7 Panjiayuan Nanli, Chaoyang District, Beijing, 100050, P.R. China
| | - Jianhua Piao
- The Key Laboratory of Trace Element Nutrition MOH, National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Room 103, 29 Nan Wei Road, Xicheng District, Beijing 100050, P.R. China.
| | - Lichen Yang
- The Key Laboratory of Trace Element Nutrition MOH, National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Room 103, 29 Nan Wei Road, Xicheng District, Beijing 100050, P.R. China.
| | - Xiaoguang Yang
- The Key Laboratory of Trace Element Nutrition MOH, National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Room 103, 29 Nan Wei Road, Xicheng District, Beijing 100050, P.R. China.
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McShan AC, De Guzman RN. The bacterial type III secretion system as a target for developing new antibiotics. Chem Biol Drug Des 2015; 85:30-42. [PMID: 25521643 DOI: 10.1111/cbdd.12422] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 08/25/2014] [Accepted: 08/26/2014] [Indexed: 01/14/2023]
Abstract
Antibiotic resistance in pathogens requires new targets for developing novel antibacterials. The bacterial type III secretion system (T3SS) is an attractive target for developing antibacterials as it is essential in the pathogenesis of many Gram-negative bacteria. The T3SS consists of structural proteins, effectors, and chaperones. Over 20 different structural proteins assemble into a complex nanoinjector that punctures a hole on the eukaryotic cell membrane to allow the delivery of effectors directly into the host cell cytoplasm. Defects in the assembly and function of the T3SS render bacteria non-infective. Two major classes of small molecules, salicylidene acylhydrazides and thiazolidinones, have been shown to inhibit multiple genera of bacteria through the T3SS. Many additional chemically and structurally diverse classes of small molecule inhibitors of the T3SS have been identified as well. While specific targets within the T3SS of a few inhibitors have been suggested, the vast majority of specific protein targets within the T3SS remain to be identified or characterized. Other T3SS inhibitors include polymers, proteins, and polypeptides mimics. In addition, T3SS activity is regulated by its interaction with biologically relevant molecules, such as bile salts and sterols, which could serve as scaffolds for drug design.
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Affiliation(s)
- Andrew C McShan
- Department of Molecular Biosciences, University of Kansas, Lawrence, KS, 66045, USA
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Gupta I, Sehgal R, Kanwar RK, Punj V, Kanwar JR. Nanocapsules loaded with iron-saturated bovine lactoferrin have antimicrobial therapeutic potential and maintain calcium, zinc and iron metabolism. Nanomedicine (Lond) 2014; 10:1289-314. [PMID: 25442715 DOI: 10.2217/nnm.14.209] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
AIM This study aimed to evaluate the potential antimicrobial efficacy of alginate gel-encapsulated ceramic nanocarriers loaded with iron-saturated bovine lactoferrin (Fe-bLf) nanocarriers/nanocapsules (AEC-CP-Fe-bLf NCs). MATERIALS & METHODS The antimicrobial activities of non-nanoformulated apo (iron free), Fe-bLf and native forms of Australian bLf against pathogenic Salmonella typhimurium (wild strain) were studied in vitro. The efficacy of AEC-CP-Fe-bLf NCs were checked in vivo using Balb/c mice model. RESULTS The study revealed that native bLf is more effective in combating infection than the conventional drug ciprofloxacin (0.4 mg/ml). The efficacy of the drug was also revealed in vivo when BALB/c mice that, after being challenged with S. typhimurium (200 μl of 10(8) CFU/ml suspension), were fed orally with a nanoformulated bLf diet and the infection was observed to be eliminated. However, chronic infection developed in the group of infected mice that did not receive any drug treatment, as well as the mice treated with ciprofloxacin. The immune response to bacterial infection and to various drug treatments thereafter was studied in the mice. CONCLUSION The study concludes that bLf and nanoformulated Fe-bLf are more effective in the treatment of Salmonella-infected mice than ciprofloxacin.
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Affiliation(s)
- Isha Gupta
- Nanomedicine-Laboratory of Immunology & Molecular Biomedical Research (NLIMBR), Molecular & Medical Research (MMR) Strategic Research Centre, School of Medicine (SoM), Faculty of Health, Deakin University, Waurn Ponds, VIC 3217, Australia
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Patel S, McCormick BA. Mucosal Inflammatory Response to Salmonella typhimurium Infection. Front Immunol 2014; 5:311. [PMID: 25071772 PMCID: PMC4082011 DOI: 10.3389/fimmu.2014.00311] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Accepted: 06/20/2014] [Indexed: 12/24/2022] Open
Abstract
The human intestinal epithelium consists of a single layer of epithelial cells that forms a barrier against food antigens and the resident microbiota within the lumen. This delicately balanced organ functions in a highly sophisticated manner to uphold the fidelity of the intestinal epithelium and to eliminate pathogenic microorganisms. On the luminal side, this barrier is fortified by a thick mucus layer, and on the serosal side exists the lamina propria containing a resident population of immune cells. Pathogens that are able to breach this barrier disrupt the healthy epithelial lining by interfering with the regulatory mechanisms that govern the normal balance of intestinal architecture and function. This disruption results in a coordinated innate immune response deployed to eliminate the intruder that includes the release of antimicrobial peptides, activation of pattern-recognition receptors, and recruitment of a variety of immune cells. In the case of Salmonella enterica serovar typhimurium (S. typhimurium) infection, induction of an inflammatory response has been linked to its virulence mechanism, the type III secretion system (T3SS). The T3SS secretes protein effectors that exploit the host’s cell biology to facilitate bacterial entry and intracellular survival, and to modulate the host immune response. As the role of the intestinal epithelium in initiating an immune response has been increasingly realized, this review will highlight recent research that details progress made in understanding mechanisms underlying the mucosal inflammatory response to Salmonella infection, and how such inflammatory responses impact pathogenic fitness of this organism.
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Affiliation(s)
- Samir Patel
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School , Worcester, MA , USA
| | - Beth A McCormick
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School , Worcester, MA , USA
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Yang C, Zhu X, Liu N, Chen Y, Gan H, Troy FA, Wang B. Lactoferrin up-regulates intestinal gene expression of brain-derived neurotrophic factors BDNF, UCHL1 and alkaline phosphatase activity to alleviate early weaning diarrhea in postnatal piglets. J Nutr Biochem 2014; 25:834-42. [PMID: 24824862 DOI: 10.1016/j.jnutbio.2014.03.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 03/14/2014] [Accepted: 03/17/2014] [Indexed: 01/19/2023]
Abstract
The molecular mechanisms underlying how dietary lactoferrin (Lf) impacts gut development and maturation and protects against early weaning diarrhea are not well understood. In this study, we supplemented postnatal piglets with an Lf at a dose level of 155 and 285 mg/kg/day from 3 to 38 days following birth. Our findings show that the high dose of Lf up-regulated messenger RNA expression levels of genes encoding brain-derived neurotrophic factor (BDNF) and ubiquitin carboxy-terminal hydrolase L1 (ubiquitin thiolesterase (UCHL1) and, to a lesser extent, glial cell line-derived neurotrophic factor, in the duodenum (P<.05). Piglets in the high and low Lf group had 30% and 7% larger jejunal crypts compared with the control group (P<.05). Escherichia coli 16S rRNA copy number per gram of ascending colon contents was significantly reduced (P=.001), while the copy number of Bifidobacteria and Lactobacillus spp. was not affected. In addition, Lf increased intestinal alkaline phosphatase activity (P<.05) and delayed the onset of food transitional diarrhea, reducing its frequency and duration (P<.05). The incidence of diarrhea in the high and low Lf groups was decreased 54% and 15%, respectively, compared with the control group (P=.035). In summary, these findings provide new evidence that dietary Lf supplementation up-regulated gene expression of BDNF and UCHL1, decreased the colon microbiota of E. coli, improved gut maturation and reduced early weaning diarrhea in piglets. The molecular basis underlying these findings suggests that Lf may enhance gut development and immune function by providing new insight into the gut-brain-microbe axis that has not been previously reported.
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Affiliation(s)
- Changwei Yang
- School of Medicine, Xiamen University, Xiamen, 361102, China
| | - Xi Zhu
- School of Medicine, Xiamen University, Xiamen, 361102, China
| | - Ni Liu
- School of Medicine, Xiamen University, Xiamen, 361102, China
| | - Yue Chen
- School of Medicine, Xiamen University, Xiamen, 361102, China
| | - Hexia Gan
- School of Medicine, Xiamen University, Xiamen, 361102, China
| | - Frederic A Troy
- School of Medicine, Xiamen University, Xiamen, 361102, China; Department of Biochemistry and Molecular Medicine, University of California School of Medicine, Davis, CA 95616, USA
| | - Bing Wang
- School of Medicine, Xiamen University, Xiamen, 361102, China; School of Animal and Veterinary Science, Charles Sturt University NSW 2678, Australia.
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The Role of Maternal Breast Milk in Preventing Infantile Diarrhea in the Developing World. CURRENT TROPICAL MEDICINE REPORTS 2014; 1:97-105. [PMID: 24883263 DOI: 10.1007/s40475-014-0015-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Multiple interventions have been designed to decrease mortality and disability in children. Among these, breastfeeding is the most cost effective intervention for protecting children against diarrhea and all causes of mortality. Human milk is uniquely suited to the human infant, both in its nutritional composition and in the nonnutritive bioactive factors that promote survival and healthy development. Suboptimal breastfeeding has been linked with numerous adverse child health outcomes including increased incidence of diarrhea and pneumonia. This review provides an update regarding recent studies on the effect of breastfeeding on diarrhea morbidity and mortality in children in developing countries, describes major human milk components responsible for this protective effect (oligosaccharides, secretory immunoglobulins, lactoferrin, bacterial microbiota, etc.), and highlights areas for future research in this topic. Breastfeeding promotion remains an intervention of enormous public health potential to decrease global mortality and promote better growth and neurodevelopment in children.
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Christen L, Lai CT, Hartmann B, Hartmann PE, Geddes DT. The effect of UV-C pasteurization on bacteriostatic properties and immunological proteins of donor human milk. PLoS One 2013; 8:e85867. [PMID: 24376898 PMCID: PMC3871660 DOI: 10.1371/journal.pone.0085867] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Accepted: 12/06/2013] [Indexed: 12/28/2022] Open
Abstract
Background Human milk possesses bacteriostatic properties, largely due to the presence of immunological proteins. Heat treatments such as Holder pasteurization reduce the concentration of immunological proteins in human milk and consequently increase the bacterial growth rate. This study investigated the bacterial growth rate and the immunological protein concentration of ultraviolet (UV-C) irradiated, Holder pasteurized and untreated human milk. Methods Samples (n=10) of untreated, Holder pasteurized and UV-C irradiated human milk were inoculated with E. coli and S. aureus and the growth rate over 2 hours incubation time at 37°C was observed. Additionally, the concentration of sIgA, lactoferrin and lysozyme of untreated and treated human milk was analyzed. Results The bacterial growth rate of untreated and UV-C irradiated human milk was not significantly different. The bacterial growth rate of Holder pasteurized human milk was double compared to untreated human milk (p<0.001). The retention of sIgA, lactoferrin and lysozyme after UV-C irradiation was 89%, 87%, and 75% respectively, which were higher than Holder treated with 49%, 9%, and 41% respectively. Conclusion UV-C irradiation of human milk preserves significantly higher levels of immunological proteins than Holder pasteurization, resulting in bacteriostatic properties similar to those of untreated human milk.
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Affiliation(s)
- Lukas Christen
- School of Chemistry and Biochemistry, Faculty of Science, The University of Western Australia, Crawley, Western Australia, Australia
- Carag AG, Baar, Switzerland
- * E-mail:
| | - Ching Tat Lai
- School of Chemistry and Biochemistry, Faculty of Science, The University of Western Australia, Crawley, Western Australia, Australia
| | - Ben Hartmann
- Perron Rotary Express Milk Bank, King Edward Memorial Hospital, Subiaco, Western Australia, Australia
- Centre for Neonatal Research and Education, The University of Western Australia, Crawley, Western Australia, Australia
| | - Peter E. Hartmann
- School of Chemistry and Biochemistry, Faculty of Science, The University of Western Australia, Crawley, Western Australia, Australia
| | - Donna T. Geddes
- School of Chemistry and Biochemistry, Faculty of Science, The University of Western Australia, Crawley, Western Australia, Australia
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Laparra J, Hernandez-Hernandez O, Moreno F, Sanz Y. Neoglycoconjugates of caseinomacropeptide and galactooligosaccharides modify adhesion of intestinal pathogens and inflammatory response(s) of intestinal (Caco-2) cells. Food Res Int 2013. [DOI: 10.1016/j.foodres.2012.10.034] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ochoa TJ, Chea-Woo E, Baiocchi N, Pecho I, Campos M, Prada A, Valdiviezo G, Lluque A, Lai D, Cleary TG. Randomized double-blind controlled trial of bovine lactoferrin for prevention of diarrhea in children. J Pediatr 2013; 162:349-56. [PMID: 22939927 PMCID: PMC3547155 DOI: 10.1016/j.jpeds.2012.07.043] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Revised: 06/19/2012] [Accepted: 07/18/2012] [Indexed: 12/29/2022]
Abstract
OBJECTIVE To determine the effect of bovine lactoferrin (bLF) on prevention of diarrhea in children. STUDY DESIGN We conducted a community-based randomized double-blind placebo controlled trial comparing supplementation with bLF vs placebo. Previously weaned children were enrolled at 12-18 months and followed for 6 months with daily home visits for data collection and supplement administration. Anthropometric measures were done monthly. RESULTS Five hundred fifty-five children were randomized: 277 to bLF and 278 to placebo; 65 dropped out; 147 894 doses were administered (92% compliance). Overall there were 91 446 child-days of observation and 1235 diarrhea episodes lasting 6219 days. The main pathogens isolated during diarrheal episodes were norovirus (35.0%), enteropathogenic E coli (11.4%), Campylobacter (10.6%), enteroaggregative E coli (8.4%), enterotoxigenic E coli (6.9%), and Shigella (6.6%). The diarrhea incidence was not different between groups: 5.4 vs 5.2 episodes/child/year for bLF and placebo, respectively (P = .375). However, the diarrhea longitudinal prevalence was lower in the bLF group vs placebo (6.6% vs 7.0%, P = .017), as well as the median duration of episodes (4.8 vs 5.3 days, P = .046), proportion of episodes with moderate or severe dehydration (1.0% vs 2.6%, P = .045), and liquid stools load (95.0 vs 98.6) liquid stools/child/year, P < .001). There were no adverse events related to the intervention. CONCLUSIONS Although there was no decrease in diarrhea incidence, longitudinal prevalence and severity were decreased with LF.
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Affiliation(s)
- Theresa J. Ochoa
- Instituto de Medicina Tropical, Universidad Peruana Cayetano Heredia, Perú,Departamento de Pediatría, Universidad Peruana Cayetano Heredia, Perú,Center for Infectious Diseases, University of Texas School of Public Health, USA,Corresponding author: Theresa J. Ochoa, MD, Department of Pediatrics, Instituto de Medicina Tropical “Alexander von Humboldt”, Universidad Peruana Cayetano Heredia, Av. Honorio Delgado 430, San Martin de Porras, Lima 31, Perú, Phone 51-1-482-3910; Fax: 51-1-482-3404, ;
| | - Elsa Chea-Woo
- Departamento de Pediatría, Universidad Peruana Cayetano Heredia, Perú
| | - Nelly Baiocchi
- Departamento de Pediatría, Universidad Peruana Cayetano Heredia, Perú
| | - Iris Pecho
- Departamento de Salud Pública, Administración y Ciencias Sociales, Universidad Peruana Cayetano Heredia, Perú
| | - Miguel Campos
- Departamento de Matemáticas, Universidad Peruana Cayetano Heredia, Perú
| | - Ana Prada
- Instituto de Medicina Tropical, Universidad Peruana Cayetano Heredia, Perú
| | - Gladys Valdiviezo
- Instituto de Medicina Tropical, Universidad Peruana Cayetano Heredia, Perú
| | - Angela Lluque
- Instituto de Medicina Tropical, Universidad Peruana Cayetano Heredia, Perú
| | - Dejian Lai
- Division of Biostatistics, University of Texas School of Public Health, USA
| | - Thomas G. Cleary
- Center for Infectious Diseases, University of Texas School of Public Health, USA
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Lactoferrin increases both resistance to Salmonella typhimurium infection and the production of antibodies in mice. Immunol Lett 2010; 134:35-46. [PMID: 20727369 DOI: 10.1016/j.imlet.2010.08.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2009] [Revised: 07/16/2010] [Accepted: 08/10/2010] [Indexed: 02/06/2023]
Abstract
Lactoferrin (Lf) is a multifunctional iron-binding glycoprotein with antibacterial and immunomodulatory activities. The antibacterial influence of orally administered bovine Lf (bLf) against murine infection caused by Salmonella typhimurium (S. typhimurium) has scarcely been explored. In the current study, Balb/c mice were treated orally for 7 days with either 5 or 100mg of bovine lactoferrin (bLf). On day 7 of treatment, mice were intragastrically infected with a lethal or sublethal dose of colony forming units (CFU) of S. typhimurium. During treatment with bLf, feces from mice sublethally infected were harvested daily to prepare fecal suspensions, which were serially diluted and plated onto Salmonella Shigella agar to estimate CFU/g of feces. After sacrificing the animals on day 7, 14 or 21 post-infection, samples of intestinal fluid, Peyer's patches (PP), liver and spleen were collected to count the number of CFU by plate dilution. Intestinal secretions were also employed, along with serum samples, to evaluate total IgA, IgG and IgM antibodies, and those against Salmonella surface proteins and bLf by ELISA assay. In lethally infected mice both bLf doses decreased mortality. In sublethally infected mice, both bLf doses decreased bacterial shedding in feces and intestinal fluid, and also reduced bacterial colonization at PP and bacterial translocation in the liver and spleen. Levels of total and those IgG and IgM in serum and IgA in intestinal secretions against Salmonella surface proteins and bLf were enhanced with both doses of bLf. These findings suggest that the effect of bLf against the infection by S. typhimurium in mice may be the result of an antimicrobial activity linked with its modulatory effect on immunocompetent cells (from intestinal and peripheral organs) involved in antibody production.
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