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Related Experiment Videos

Immunomodulation by hydatid cyst fluid toxin (Echinococcus granulosus)

D Janssen1, M C Rueda, P H De Rycke

  • 1Institute of Biotechnology, Faculty of Sciences, Granada, Spain.

Parasite Immunology
|April 1, 1997
PubMed
Summary

Hydatid fluid (HF) contains toxins that harm immune cells, affecting T-cell density and antibody production. These findings shed light on the host-parasite relationship in hydatidosis.

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Area of Science:

  • Immunology
  • Parasitology
  • Biochemistry

Background:

  • Hydatid cysts (Echinococcus granulosus) infection in mice modulates host immunity.
  • Hydatid fluid (HF) contains various components that may influence immune responses.

Purpose of the Study:

  • To investigate the immunomodulatory effects of hydatid fluid (HF) and its purified fractions.
  • To identify specific toxic components within HF and their impact on immune cells.

Main Methods:

  • Fractionation of HF using ammonium sulphate precipitation, chloroform/methanol extraction, and thin-layer chromatography (TLC).
  • In vitro assessment of toxicity on murine peritoneal macrophages.
  • In vivo studies involving antibody production assays and flow-cytometric analysis of lymphocytes, T-cells, and thymocytes.

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Main Results:

  • HF exhibited toxicity towards murine macrophages in vitro.
  • A specific TLC-purified fraction demonstrated significant toxicity and adjuvant-like effects on antibody production.
  • Treatment with the toxic fraction reduced peripheral blood lymphocytes and altered T-cell marker expression (CD3, CD4, CD8) in mice.
  • In vitro, the toxin down-regulated CD4 and CD8 expression on thymocytes, dependent on macrophage presence.

Conclusions:

  • Specific toxins within hydatid fluid play a role in the immunomodulation observed during hydatidosis.
  • These toxins can impair immune cell function, potentially contributing to the host-parasite relationship.