Parasitology Research

, Volume 100, Issue 5, pp 935–942

Effects of protoscoleces and AgB from Echinococcus granulosus on human neutrophils: possible implications on the parasite’s immune evasion mechanisms

  • Veridiana Gomes Virginio
  • Lorena Taroco
  • Ana Lía Ramos
  • Ana Maria Ferreira
  • Arnaldo Zaha
  • Henrique Bunselmeyer Ferreira
  • Ana Hernández
Original Paper

DOI: 10.1007/s00436-006-0366-x

Cite this article as:
Virginio, V.G., Taroco, L., Ramos, A.L. et al. Parasitol Res (2007) 100: 935. doi:10.1007/s00436-006-0366-x

Abstract

The factors affecting the innate susceptibility to Echinococcus granulosus infections are largely unknown. We assessed the interaction of healthy human neutrophils with protoscoleces (PSC) and antigen B (AgB) of E. granulosus by analysis of CD11b upregulation and H2O2 production by flow cytometry. PSC induced neutrophil activation, but their viability was not affected. In contrast, no effects were observed with AgB in both assays. Neutrophil-enriched fractions were also incubated with PSC or AgB, and interleukin 8 (IL-8) production was measured by ELISA. Significant increment in IL-8 production was detected only in supernatants from neutrophil-enriched fractions cultured with PSC. The possible effect of a prior incubation with AgB on the phorbol myristate acetate-induced activation was also evaluated. No changes were observed in CD11b expression, but the H2O2 production was significantly reduced in platelet-activating factor (PAF)-primed neutrophils. These results suggest a possible AgB-mediated mechanism of evasion of the host immune response, which would operate upon events of spillage of the fertile hydatid cyst content.

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Veridiana Gomes Virginio
    • 1
  • Lorena Taroco
    • 2
  • Ana Lía Ramos
    • 2
  • Ana Maria Ferreira
    • 2
  • Arnaldo Zaha
    • 1
  • Henrique Bunselmeyer Ferreira
    • 1
  • Ana Hernández
    • 2
  1. 1.Laboratório de Biologia Molecular de Cestódeos, Centro de BiotecnologiaUniversidade Federal do Rio Grande do SulPorto Alegre, RSBrazil
  2. 2.Instituto de Higiene, Cátedra de Inmunología, Facultad de Química–Facultad de CienciasUniversidad de la RepúblicaMontevideoUruguay

Personalised recommendations