Acquisition of Serum Antibodies Reactive With Enterohemorrhagic Escherichia coli Virulence-Associated Factors by Healthy Brazilian Children and Adults

Acquisition of Serum Antibodies Reactive With Enterohemorrhagic Escherichia coli Virulence-Associated Factors by Healthy Brazilian Children and Adults

Author Palmeira, Patricia Google Scholar
Carbonare, Solange B. Google Scholar
Guth, Beatriz E. C. Autor UNIFESP Google Scholar
Carbonare, Cristiane B. Google Scholar
Pontes, Gerlandia N. Google Scholar
Tino-De-Franco, Milene Google Scholar
Zapata-Quintanilla, Lucy B. Google Scholar
Carneiro-Sampaio, Magda Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Butantan Inst
Abstract Background: Patients with hemorrhagic colitis or hemolytic uremic syndrome due to enterohemorrhagic Escherichia coli (EHEC) develop serum IgM and IgG response to lipopolysaccharide (LPS) and to virulence factors such as intimin. the small numbers of cases of diarrhea associated with EHEC strains in Brazil suggests a pre-existing immunity probably due to previous contact with diarrheagenic E. coli. Our aim was to evaluate the development of the serum antibody repertoire to EHEC virulence factors in Brazilian children and adults.Methods: Serum IgM and IgG antibodies were determined by enzyme-linked immunosorbent assay with LPS O111, LPS O26, and LPS O157 in 101 children between 2 months and 10 years of age and in 100 adult sera, by immunoblotting with protein membrane extracts and purified beta intimin; the ability of adult sera to neutralize Shiga toxin2 was also investigated.Results: Children older than 24 months had IgM concentrations reactive with the 3 LPS equivalent to those seen in the adult group, and significantly higher than the group of younger children (P < 0.05). Anti-O26 and anti-O157 LPS IgG concentrations were equivalent between the 2 groups of children and were significantly different from the adult group (P < 0.05). the anti-O111 LPS IgG levels in older children were intermediate between the younger group, and adults (P < 0.05). Immunoblotting revealed strong protein reactivity, including the conserved and variable regions of beta intimin and more than 50% of the adult samples neutralized Shiga toxin 2.Conclusions: Our results demonstrate an increasing anti-LPS and antiprotein antibody response with age, which could provide protection against EHEC infections.
Keywords enterohemorrhagic Escherichia coli
lipopolysaccharide
Stx2
intimin
antibody response
IgG antibodies
IgM antibodies
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Grant number FAPESP: 02/03596-7
FAPESP: 03/13250-3
Date 2009-12-01
Published in Pediatric Infectious Disease Journal. Philadelphia: Lippincott Williams & Wilkins, v. 28, n. 12, p. 1089-1094, 2009.
ISSN 0891-3668 (Sherpa/Romeo, impact factor)
Publisher Lippincott Williams & Wilkins
Extent 1089-1094
Origin http://dx.doi.org/10.1097/INF.0b013e3181aa6b2d
Access rights Closed access
Type Article
Web of Science ID WOS:000272225200012
URI http://repositorio.unifesp.br/handle/11600/32002

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