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The possible role of the frontal and sub-parietal gland systems of the pentastomid Reighardia sternae (Diesing, 1864) in the evasion of the host immune response

Published online by Cambridge University Press:  06 April 2009

J. Riley ,
J. L. James  and
A. A. Banaja
J. Riley
Affiliation:
Department of Biological Sciences, The University, Dundee DD1 4HN
J. L. James
Affiliation:
Department of Biological Sciences, The University, Dundee DD1 4HN
A. A. Banaja
Affiliation:
Department of Biological Sciences, The University, Dundee DD1 4HN
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Summary

The frontal and sub-parietal glands of the pentastomid Reighardia sternae elaborate lamellate secretion which is poured on to the cuticle. The entire surface of the cuticle, including the mouth, hook pits and reproductive apertures, is coated with secretion. Electron microscope studies indicate that the glands are continuously active, which implies a turnover of surface membranes. The postulated function of these membranes is to protect certain vital areas of the host–parasite interface, notably the pores of ion-transporting cells, from the host immune response. The available evidence suggests that pentastomids do evoke a strong immune response but since most are long-lived they must circumvent it. We believe the surface membrane system to be instrumental in this. Studies on another pentastomid, Porocephalus crotali in rats have shown that an immune response stimulated by a primary infection will kill subsequent infections and that the surface membranes are strongly immunogenic. Obvious parallels between this situation and that of schistosome infections in mammals are discussed. An alternative explanation of concomitant immunity is proposed.

Type
Research Article
Information
Parasitology , Volume 78 , Issue 1 , February 1979 , pp. 53 - 66
Copyright
Copyright © Cambridge University Press 1979

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References

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