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Related Experiment Videos

Echinococcus granulosus: interactions with host complement in secondary infection in mice

A Díaz1, A M Ferreira, A Nieto

  • 1Cátedra de Inmunología, Facultad de Química, Montevideo, Uruguay.

Experimental Parasitology
|May 1, 1995
PubMed
Summary

Complement depletion significantly reduced Echinococcus granulosus cysts in mice, suggesting complement plays a crucial role in infection establishment despite parasite evasion mechanisms. Further local studies are needed.

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Area of Science:

  • Immunology
  • Parasitology
  • Infectious Diseases

Background:

  • The complement system can lyse Echinococcus granulosus protoscoleces.
  • Parasite-derived products may consume complement, acting as an evasion strategy.
  • The in vivo role of complement in hydatidosis establishment is not fully understood.

Purpose of the Study:

  • To assess in vivo complement consumption by Echinococcus granulosus.
  • To determine the role of complement in the establishment of secondary hydatidosis.
  • To investigate parasite burden in normal versus complement-depleted mice.

Main Methods:

  • Murine secondary hydatidosis model with intraperitoneal inoculation.
  • Measurement of systemic C3 activation, total C3, and hemolytic complement.

Related Experiment Videos

  • Complement depletion using cobra venom factor.

    • Main Results:

    • No evidence of systemic complement consumption by the parasite was found.
    • Complement depletion led to a significant 79% reduction in cyst numbers (P < 0.05).
    • Host complement-mediated lysis or opsonization appears ineffective against the establishing parasite.

    Conclusions:

    • Complement plays a significant, unexpected role in controlling Echinococcus granulosus infection establishment.
    • Systemic complement consumption by the parasite was not evident, but local consumption remains a possibility.
    • Future research should focus on the local significance of complement activation by the parasite.