Lipopolysaccharide O-antigen of enterohemorrhagic Escherichia coli O157:H7 is required for killing both insects and mammals

Abstract Studies of enterohemorrhagic Escherichia coli (EHEC) infection mechanisms using mammals require large numbers of animals and are both costly and associated with ethical problems. Here, we evaluated the pathogenic mechanisms of EHEC in the silkworm model. Injection of a clinically isolated E...

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Veröffentlicht in:FEMS microbiology letters 2012-08, Vol.333 (1), p.59-68
Hauptverfasser: Miyashita, Atsushi, Iyoda, Sunao, Ishii, Kenichi, Hamamoto, Hiroshi, Sekimizu, Kazuhisa, Kaito, Chikara
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container_start_page 59
container_title FEMS microbiology letters
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creator Miyashita, Atsushi
Iyoda, Sunao
Ishii, Kenichi
Hamamoto, Hiroshi
Sekimizu, Kazuhisa
Kaito, Chikara
description Abstract Studies of enterohemorrhagic Escherichia coli (EHEC) infection mechanisms using mammals require large numbers of animals and are both costly and associated with ethical problems. Here, we evaluated the pathogenic mechanisms of EHEC in the silkworm model. Injection of a clinically isolated EHEC O157:H7 Sakai into either the silkworm hemolymph or intraperitoneal fluid of mice killed the host animals. EHEC O157:H7 Sakai deletion mutants of the rfbE gene, which encodes perosamine synthetase, a monosaccharide component synthetase of the O-antigen, or deletion mutants of the waaL gene, which encodes O-antigen ligase against the lipid A-core region of lipopolysaccharide (LPS), had attenuated killing ability in both silkworms and mice. Introduction of the rfbE gene or the waaL gene into the respective mutants restored the killing ability in silkworms. Growth of both mutants was inhibited by a major antimicrobial peptide in the silkworm hemolymph, moricin. The viability of both mutants was decreased in swine serum. The bactericidal effect of swine serum against both mutants was inactivated by heat treatment. These findings suggest that the LPS O-antigen of EHEC O157:H7 plays an important defensive role against antimicrobial factors in the host body fluid and is thus essential to the lethal effects of EHEC in animals.
doi_str_mv 10.1111/j.1574-6968.2012.02599.x
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Here, we evaluated the pathogenic mechanisms of EHEC in the silkworm model. Injection of a clinically isolated EHEC O157:H7 Sakai into either the silkworm hemolymph or intraperitoneal fluid of mice killed the host animals. EHEC O157:H7 Sakai deletion mutants of the rfbE gene, which encodes perosamine synthetase, a monosaccharide component synthetase of the O-antigen, or deletion mutants of the waaL gene, which encodes O-antigen ligase against the lipid A-core region of lipopolysaccharide (LPS), had attenuated killing ability in both silkworms and mice. Introduction of the rfbE gene or the waaL gene into the respective mutants restored the killing ability in silkworms. Growth of both mutants was inhibited by a major antimicrobial peptide in the silkworm hemolymph, moricin. The viability of both mutants was decreased in swine serum. The bactericidal effect of swine serum against both mutants was inactivated by heat treatment. 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Psychology ; Gene deletion ; Genes, Bacterial ; Heat treatment ; Hemolymph ; Hemolymph - immunology ; Hot Temperature ; Insect Proteins - immunology ; Insects ; Lethal Dose 50 ; Lethal effects ; Lipid A ; Lipids ; lipopolysaccharide O‐antigen ; Lipopolysaccharides ; Mammals ; Mice ; Microbial Viability ; Microbiology ; Miscellaneous ; Monosaccharides ; O Antigens - genetics ; O Antigens - toxicity ; RfbE gene ; Sequence Deletion ; silkworm model ; Silkworms ; Swine ; Swine - immunology ; Transaminases - genetics ; Transaminases - metabolism ; Viability ; virulence</subject><ispartof>FEMS microbiology letters, 2012-08, Vol.333 (1), p.59-68</ispartof><rights>Copyright © 2012 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved 2012</rights><rights>2012 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. 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source MEDLINE; Wiley Journals; Oxford University Press Journals All Titles (1996-Current)
subjects Adhesins, Bacterial - genetics
Adhesins, Bacterial - metabolism
Animals
Anti-Bacterial Agents - immunology
Antigens
Antigens, Bacterial - immunology
Antiinfectives and antibacterials
Antimicrobial Cationic Peptides - immunology
Antimicrobial peptides
Bacteria
Bacteriology
Biological and medical sciences
Body fluids
Bombyx - immunology
Bombyx - microbiology
Bombyx mori
Carbohydrate Epimerases - genetics
Carbohydrate Epimerases - metabolism
Carbon-Oxygen Ligases - genetics
Carbon-Oxygen Ligases - metabolism
Deletion mutant
Disease Models, Animal
E coli
enterohemorrhagic Escherichia coli
Escherichia coli
Escherichia coli Infections - immunology
Escherichia coli Infections - microbiology
Escherichia coli O157 - genetics
Escherichia coli O157 - growth & development
Escherichia coli O157 - pathogenicity
Escherichia coli Proteins - genetics
Escherichia coli Proteins - metabolism
Fundamental and applied biological sciences. Psychology
Gene deletion
Genes, Bacterial
Heat treatment
Hemolymph
Hemolymph - immunology
Hot Temperature
Insect Proteins - immunology
Insects
Lethal Dose 50
Lethal effects
Lipid A
Lipids
lipopolysaccharide O‐antigen
Lipopolysaccharides
Mammals
Mice
Microbial Viability
Microbiology
Miscellaneous
Monosaccharides
O Antigens - genetics
O Antigens - toxicity
RfbE gene
Sequence Deletion
silkworm model
Silkworms
Swine
Swine - immunology
Transaminases - genetics
Transaminases - metabolism
Viability
virulence
title Lipopolysaccharide O-antigen of enterohemorrhagic Escherichia coli O157:H7 is required for killing both insects and mammals
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