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Inhibition of lymphocyte activation by hatching fluid from Schistosoma mansoni eggs
Infection and Immunity
|April 1, 1982
Abstract:
A preparation of the fluid released upon hatching of the miracidia from Schistosoma mansoni eggs was found to have a potent inhibitory effect on the in vitro activation of hamster lymphocytes by mitogens. The effect was concentration dependent, not cytotoxic, and was the same on cells from healthy and schistosome-infected animals.
Insights
Fluid from hatching Schistosoma mansoni miracidia inhibits hamster lymphocyte activation by mitogens. This potent, non-cytotoxic effect is concentration-dependent and observed in both healthy and infected animals, suggesting a key immunomodulatory role.
Area of Science:
- Immunology
- Parasitology
- Cell Biology
Background:
- Schistosoma mansoni is a parasitic flatworm causing schistosomiasis.
- Lymphocyte activation is crucial for adaptive immunity.
- Parasitic infections can modulate host immune responses.
Purpose of the Study:
- To investigate the immunomodulatory properties of hatching fluid from Schistosoma mansoni miracidia.
- To determine the effect of this fluid on lymphocyte activation in vitro.
- To assess if the effect is dose-dependent, cytotoxic, or specific to infection status.
Main Methods:
- Preparation of hatching fluid from Schistosoma mansoni miracidia.
- In vitro lymphocyte activation assays using mitogens.
- Assessment of cell viability and dose-response.
- Comparison of effects on lymphocytes from healthy and infected hamsters.
Main Results:
- The hatching fluid demonstrated potent inhibition of lymphocyte activation.
- The inhibitory effect was concentration-dependent.
- The fluid was not cytotoxic to lymphocytes.
- The inhibition was consistent in lymphocytes from both healthy and schistosome-infected hamsters.
Conclusions:
- Hatching fluid from Schistosoma mansoni miracidia possesses significant immunomodulatory capabilities.
- This fluid actively suppresses lymphocyte activation, independent of host infection status.
- These findings highlight a potential mechanism by which Schistosoma mansoni manipulates the host immune system during early infection stages.