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Penetration stimuli of fish skin for Acanthostomum brauni cercariae

Published online by Cambridge University Press:  06 April 2009

M. Ostrowski De Nuñez
Affiliation:
Institut für Zoologie I, Universität Erlangen-Nürnberg, Staudtstrasse 5, D-8520 Erlangen, Federal Republic of, Germany
W. Haas
Affiliation:
Institut für Zoologie I, Universität Erlangen-Nürnberg, Staudtstrasse 5, D-8520 Erlangen, Federal Republic of, Germany

Summary

The cercaria of Acanthostomum brauni penetrates the skin of its fish host in response to a combination of two chemical signals from the fish skin surface: free fatty acids and a macro-molecular mucus component. The latter seems to be a protein, as the penetration-stimulating activity of fish skin surface mucus is eliminated by digestion with proteinase, but not by digestion with glycosidases, nor by a removal of glycosaminoglycans. These penetration-stimulating host signals differ from the glycoproteins that stimulate the attachment of A. brauni cercariae to the host and also from the macro-molecular fish host signals which have been found to stimulate the attachment and penetration by Opisthorchis viverrini cercariae.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1991

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