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Isolation And Dendritic Cell-Uptake of Small Extracellular Vesicles from Echinococcus granulosus
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Crustacean-acanthocephalan interaction and host cell-mediated immunity: parasite encapsulation and melanization
Bahram Sayyaf Dezfuli1, Edi Simoni, Laura Duclos
1Department of Biology and Evolution, University of Ferrara, St. Borsari, 46, 44100 Ferrara, Italy. dzb@unife.it
Folia Parasitologica
|June 27, 2008
Summary
Pomphorhynchus laevis larvae in Echinogammarus stammeri amphipods cause organ displacement but no damage. Interestingly, only P. laevis larvae showed melanization, unlike other acanthocephalans in this host.
Area of Science:
- Parasitology
- Invertebrate Zoology
- Ecology
Background:
- Host-parasite interactions are crucial in understanding ecosystem dynamics.
- Acanthocephalan parasites, like Pomphorhynchus laevis, utilize intermediate hosts such as amphipods.
- Echinogammarus stammeri is a freshwater amphipod found in European rivers.
Purpose of the Study:
- To describe the host-parasite interactions between Pomphorhynchus laevis and its intermediate host Echinogammarus stammeri.
- To investigate the host's immune response to P. laevis infection.
- To compare the interaction of P. laevis with other acanthocephalan species in E. stammeri.
Main Methods:
- Field collection of naturally infected E. stammeri from the Brenta River, Italy.
- Microscopic examination of infected amphipods to observe parasite morphology and host tissue response.
- Identification and characterization of haemocytes in E. stammeri.
- Histological analysis to assess larval encapsulation and melanization.
Main Results:
- Pomphorhynchus laevis larvae occupied the haemocoel, displacing host organs without causing apparent damage.
- A membranous layer formed by microvilli surrounded P. laevis larvae, maintaining contact with host haemocytes.
- Three types of haemocytes (hyaline, semi-granular, granular) were identified in E. stammeri.
- Melanization of P. laevis larvae was observed in E. stammeri, a response not seen with other acanthocephalan species (Echinorhynchus truttae, Polymorphus minutus, Acanthocephalus clavula).
Conclusions:
- Echinogammarus stammeri exhibits a specific immune response, including melanization, towards Pomphorhynchus laevis infection.
- The absence of melanization in other acanthocephalan species suggests varying host-parasite compatibility.
- These findings contribute to understanding the intricate dynamics of host-parasite relationships in aquatic ecosystems.
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