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Schistosoma mansoni: an ultrastructural examination of pulmonary migration

Published online by Cambridge University Press:  06 April 2009

Jean E. Crabtree  and
R. A. Wilson
Jean E. Crabtree
Affiliation:
Department of Biology, University of York, Heslington, York YO1 5DD
R. A. Wilson
Affiliation:
Department of Biology, University of York, Heslington, York YO1 5DD
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Summary

The migration of schistosomula through the lungs of mice has been investigated at the ultrastructural level. On Days 4 and 7 post-infection schistosomula were located only within the vasculature. Newly arrived Day 4 schistosomula were highly convoluted and completely occluded vessels measuring approximately 15–25μm in diameter. By Day 7 parasites were located in pulmonary capillaries, often causing considerable distension. The subtegumentary fibrous interstitial layer was absent in elongated lung schistosomula. The minimum diameter of such parasites was 8μm, and their tegument was usually unridged and flattened against the vascular endothelium, thus resulting in close apposition of endothelial and tegumental membranes. The tight fit of schistosomula in the pulmonary capillaries implies that migration through them is both a strenuous and slow process. The migratory delay in the lungs after arrival from the skin occurs because dimensional changes are necessary for successful capillary migration.

Type
Research Article
Information
Parasitology , Volume 92 , Issue 2 , April 1986 , pp. 343 - 354
Copyright
Copyright © Cambridge University Press 1986

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