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Hymenolepis diminuta: an investigation of juvenile hormone titre, degradation and supplementation in the intermediate host, Tenebrio molitor

Published online by Cambridge University Press:  06 April 2009

H. Hurd ,
C. Strambi  and
N. E. Beckage
H. Hurd
Affiliation:
Parasitology Research Laboratory, Department of Biological Sciences, University of Keele, Keele, Staffs ST5 5BG, UK
C. Strambi
Affiliation:
CNRS-Laboratoire de Neurobiologie, BP 71, 13402 Marseille Cedex 9, France
N. E. Beckage
Affiliation:
Stored Products Insect Research Unit, ARS, USDA, Wisconsin, Department of Entomology, University of Wisconsin, Madison 53706, USA
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Summary

Metacestodes of Hymenolepis diminuta cause a perturbance of vitellogenesis in the intermediate host Tenebrio molitor. The reduction in host reproductive output associated with infection may be due to this pathophysiology. Many of these events are regulated by host juvenile hormone (JH). A comparison of the titre of JH and its rate of degradation in female control and parasitized 15-day-old insects has been made. Haemolymph from female beetles contained 1·27 pMol JH equivalents/100 µl. No significant difference was associated with infection. However, topical application of a JH analogue, methoprene, at the time of infecion or 8 days post-infection reduced the significant accumulation of vitellogenin usually found in the haemolymph of females 12 days or more post-infection. These findings indicate that parasite-induced alteration of host vitellogenesis is not mediated via alteration in JH titres, although observations made after hormone supplementation suggest some form of interaction between the parasite and the host endocrine system.

Keywords

host—parasite interactionscestodeHymenolepis diminuta metacestodesTenebrio molitorhost vitellogenesishost juvenile hormonehost juvenile hormone esterase
Type
Research Article
Information
Parasitology , Volume 100 , Issue 3 , June 1990 , pp. 445 - 452
Copyright
Copyright © Cambridge University Press 1990

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