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Effects of three anthelmintics on the tegument of Hymenolepis fraterna (Cestoda)

Published online by Cambridge University Press:  06 April 2009

S. R. Stoitsova ,
L. N. Gorchilova  and
J. Daněk
S. R. Stoitsova
Affiliation:
Institute of Parasitology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 25, 1113 Sofia, Bulgaria
L. N. Gorchilova
Affiliation:
Institute of Parasitology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 25, 1113 Sofia, Bulgaria
J. Daněk
Affiliation:
Center for Veterinary Drugs, Research Institute for Feed Supplements and Veterinary Drugs, Pohoří-Chotouň, 254 49 Jilové near Prague, Czechoslovakia
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Summary

The in vivo effects of the anthelmintics taenifugin, VÚFB 14170 and VÚFB 15269 on the tegument of Hymenolepis fraterna have been examined by SEM, TEM and cytochemistry. The drugs were given to H. fraterna-infected mice on the 14th day post-infection in a single oral dose of 150, 200 and 200 mg/kg, respectively. By 72 h post-treatment, the drug-induced pathomorphological changes in the tegument indicated that all three drugs had a significant effect. Changes were most pronounced on the brush border and in the intercellular material. On the apical surface, there was blebbing as well as accumulation of membrane fragments over the microthrix tips and erosion of the brush border. The intercellular material was changed in structure, showing increased electron density in some areas and oedema of the intercellular spaces in other areas. There were also fractures of the tegument of variable depth, sometimes reaching to the parenchyma. These results suggest altered tegumental integrity and, occasionally, complete disruption of the selective permeability barrier created by the normal tegument. This suggestion is further supported by the penetration of ruthenium red into some tegumental areas and its distribution into the intercellular spaces, down to the parenchyma. The intrategumental lysosomes also appeared to be significantly activated. There was evidence of autophagy in both distal cytoplasm and tegumental cells. Mature and gravid proglottides were more susceptible to drug damage than those in the anterior strobila and neck.

Keywords

Hymenolepis fraternaanthelminticstegumental ultrastructure
Type
Research Article
Information
Parasitology , Volume 104 , Issue 1 , February 1992 , pp. 143 - 152
Copyright
Copyright © Cambridge University Press 1992

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