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Related Experiment Video

Updated: Jul 15, 2026

Cercarial Transformation and in vitro Cultivation of Schistosoma mansoni Schistosomules

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Ecdysteroids as regulators of host and parasite interactions: a study of interrelationships between Schistosoma

C J Shiff¹, S F Dossaji

¹Johns Hopkins University, School of Hygiene and Public Health, Baltimore, Maryland.

Tropical Medicine and Parasitology : Official Organ of Deutsche Tropenmedizinische Gesellschaft and of Deutsche Gesellschaft Fur Technische Zusammenarbeit (GTZ)

|March 1, 1991

Summary

Ecdysteroids, hormones found in snails and parasites, can influence host-parasite interactions. Beta-ecdysterone aids snail growth and parasite location, but plant-derived versions show no effect.

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Mass Isolation and In Vitro Cultivation of Intramolluscan Stages of the Human Blood Fluke Schistosoma Mansoni

Mass Isolation and In Vitro Cultivation of Intramolluscan Stages of the Human Blood Fluke Schistosoma Mansoni

Published on: January 14, 2018

Area of Science:

Endocrinology
Parasitology
Malacology

Background:

Ecdysteroids are insect and crustacean hormones also found in trematode parasites and gastropod snails.
Hormones may regulate complex host-parasite interactions, particularly in snail-schistosome systems.

Purpose of the Study:

To investigate the role of ecdysteroids in the host-parasite relationship between the trematode Schistosoma mansoni and its snail host Biomphalaria glabrata.
To determine the effects of beta-ecdysterone and plant-derived phytoecdysteroids on parasite behavior and snail physiology.

Main Methods:

Administered beta-ecdysterone and plant extracts rich in phytoecdysteroids to Biomphalaria glabrata snails and Schistosoma mansoni miracidia.
Assessed the impact on miracidial host-location behavior, snail growth rates, and snail egg production.

Main Results:

Beta-ecdysterone significantly stimulated host-location behavior in S. mansoni miracidia.
Beta-ecdysterone administration enhanced growth and egg production in B. glabrata snails.
Plant extracts containing phytoecdysteroids did not attract miracidia or affect snail growth and egg production.

Conclusions:

Ecdysteroids play a role in modulating host-parasite interactions between S. mansoni and B. glabrata.
Beta-ecdysterone shows potential as a factor influencing parasite infectivity and host fitness.
Phytoecdysteroids from plants are unlikely to be useful in disrupting schistosome-snail interactions.