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Adaptability of the coccidian Coelotropha to parasitism
Adaptability of the coccidian Coelotropha to parasitism
- Source :
- Developmental & Comparative Immunology. 16:263-274
- Publication Year :
- 1992
- Publisher :
- Elsevier BV, 1992.
-
Abstract
- The coccidian, Coelotropha durchoni, manages to develop in its host, the polycheate annelid, Nereis diversicolor, because of its ability to circumvent the host's internal defence system. First, it avoids phagocytes by penetrating other cells, principally eleocytes and muscular cells, where it undergoes a phase of intracellular development. After becoming extracellular, a thick coat protects it from being attacked by granulocytes. This coat then breaks and is shed from its surface to permit fertilization. Parasites that have lost their coats and remain unfertilized are surrounded with granulocytes and destroyed by encapsulation. A strict hormonal correlation exists between the biological cycles of the parasite and its host. Thus, the mature spores of the coccidian parasite are disseminated when the worm lays its gametes by rupture of teguments. C. durchoni and N. diversicolor have established a biological equilibrium that permits mutual survival of both partners and constitutes a simple model for the study of the host-parasite relationship.
- Subjects :
- Annelid
Ecology
Immunology
Parasitism
Polychaeta
Granulocyte
Biology
biology.organism_classification
Adaptation, Physiological
Neurosecretory Systems
Coccidia
Host-Parasite Interactions
Spore
Cell biology
medicine.anatomical_structure
Immunity
Extracellular
medicine
Animals
Parasite hosting
Protozoa
Developmental Biology
Subjects
Details
- ISSN :
- 0145305X
- Volume :
- 16
- Database :
- OpenAIRE
- Journal :
- Developmental & Comparative Immunology
- Accession number :
- edsair.doi.dedup.....edc86264f0c899931aac5b6001c95ec6
- Full Text :
- https://doi.org/10.1016/0145-305x(92)90001-s