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Phagocytosis of microvilli of the metacestode of Hymenolepis diminuta by Tenebrio molitor haemocytes

Published online by Cambridge University Press:  06 April 2009

K.Sylvia Richards  and
C. Arme
K.Sylvia Richards
Affiliation:
Parasitology Research Laboratory, Department of Biological Sciences, University of Keele, Keele, Staffs. ST5 5BG
C. Arme
Affiliation:
Parasitology Research Laboratory, Department of Biological Sciences, University of Keele, Keele, Staffs. ST5 5BG
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Extract

A limited number of metacestodes of Hymenolepis diminuta from Tenebrio molitor had host plasmatocytes and cell debris of coagulocyte origin associated with the microvillar surface. There was evidence of phagocytosis of microvilli by plasmatocytes, involving clathrin-like endocytotic vesicles. In contrast to these otherwise ‘normal’ cysticercoids, occasional batches were ‘sticky’ and, on flushing into saline, rapidly developed large bladders possibly associated with osmotic stress. In addition, numerous small surface blebs were present. These ‘surface-stressed’ cysticercoids also had host plasmatocytes and cell debris associated with the bladder bases and the blebs, and phagocytosis of microvilli was observed. In no case had precipitation of haemolymph, melanization or encapsulation (features typical of the insect immune response) occurred. The possibility that the limited host response indicates a spatially restricted impairment of the surface compatibility of the parasite, and thus insufficient to elicit the full immune response, is discussed.

Type
Research Article
Information
Parasitology , Volume 90 , Issue 2 , April 1985 , pp. 365 - 374
Copyright
Copyright © Cambridge University Press 1985

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