Cook SR, Maiti PK, DeVinney R, Allen-Vercoe E, Bach SJ, McAllister TA. Avian- and mammalian-derived antibodies against adherence-associated proteins inhibit host cell colonization byEscherichia coliO157:H7.
J Appl Microbiol 2007;
103:1206-19. [PMID:
17897225 DOI:
10.1111/j.1365-2672.2007.03334.x]
[Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
AIM
To evaluate the potential for polyclonal antibodies targeting enterohaemorrhagic Escherichia coli (EHEC) virulence determinants to prevent colonization of host cells by E. coli O157:H7.
METHODS AND RESULTS
Rats and laying hens were immunized with recombinant proteins from E. coli O157:H7, EspA, C-terminal intimin or EscF. Rat antisera (IgG) or chicken egg powders (IgY) were assessed for their ability to inhibit growth and colonization-associated processes of E. coli O157:H7. Mammalian antisera with antibodies to intimin, EspA or EscF effectively reduced adherence of the pathogen to HeLa cells (P<0.05) and prevented type III secretion of Tir. Similarly, HeLa cells treated with chicken egg powder containing antibodies against intimin or EspA were protected from EHEC adherence (P<0.05). Neither egg nor rat antibody preparations had any antibacterial effect on the growth of EHEC (P>0.05).
CONCLUSIONS
Antibody preparations targeting EHEC adherence-associated factors were effective at preventing adhesion and intimate colonization-associated events.
SIGNIFICANCE AND IMPACT OF THE STUDY
This work indicates that immunotherapy with anti-adherence antibodies can reduce E. coli O157:H7 colonization of host cells. Passive immunization with specific antibodies may have the potential to reduce E. coli O157:H7 colonization in hosts such as cattle or humans.
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