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Schistosoma mansoni: evidence that ‘non-permissiveness’ in 129/Ola mice involves worm relocation and attrition in the lungs

Published online by Cambridge University Press:  06 April 2009

A. A. F. Elsaghier ,
P. M. Knopf ,
G. F. Mitchell  and
D. J. Mclaren
A. A. F. Elsaghier
Affiliation:
National Institute for Medical Research, Mill Hill, London NW7 1A A, UK
P. M. Knopf
Affiliation:
Brown University, Rhode Island, USA
G. F. Mitchell
Affiliation:
Walter & Eliza Hall Institute of Medical Research, Melbourne, Australia
D. J. Mclaren
Affiliation:
National Institute for Medical Research, Mill Hill, London NW7 1A A, UK
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Summary

129/Ola mice resemble WEHI 129J mice in that around 70% of the individuals in any given population resist a primary infection with Schistosoma mansoni. Squashed-organ autoradiographic tracking of [Se]selenomethionine-labelled parasites has shown that the kinetics of worm migration in 129/Ola mice follows the expected pattern, and that all rodents harbour essentially similar numbers of worms on day 14 post-infection. Combined lung and liver worm recovery techniques have revealed, however, that segregation of mice into ‘permissive’ and ‘non-permissive’ individuals can first be detected on day 20. ‘Non-permissive’ mice are characterized by the absence of schistosome eggs at all times in the liver parenchyma and, in consequence, lack the attendant manifestations of pathology; they do, however, harbour a few stunted worms in the liver and significant numbers of adult schistosomes in the pulmonary vasculature. Histological analysis of sectioned lung tissue from such animals indicates that some lung-located schistosomes feed, pair and lay eggs. Nevertheless, eosinophil-enriched inflammatory reactions develop around such worms and the parasites themselves exhibit various manifestations of trauma, ranging from minor vacuolation to gut herniation and extrusion. The phenomenon of ‘non-permissiveness’ thus involves retardation of worm development in the liver and, in consequence, relocation of the parasites to the lungs, where they become subject to host effector responses.

Keywords

Schistosoma mansoni129/Ola micenon-permissivenessautoradiographic trackingrelocationlung inflammation.
Type
Research Article
Information
Parasitology , Volume 99 , Issue 3 , December 1989 , pp. 365 - 375
Copyright
Copyright © Cambridge University Press 1989

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