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Histochemical Studies of Esterases in the Cuticle and Nerve Cords of Four Cyclophyllidean Cestodes

James L. Schardein and J. Allan Waitz
The Journal of Parasitology
Vol. 51, No. 3 (Jun., 1965), pp. 356-363
DOI: 10.2307/3275953
Stable URL: http://www.jstor.org/stable/3275953
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Histochemical Studies of Esterases in the Cuticle and Nerve Cords of Four Cyclophyllidean Cestodes
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Abstract

The histochemical localization of nonspecific (simple) esterase and cholinesterase and the effects of esterase inhibitors on these enzymes have been studied in Hymenolepis diminuta, H. nana, Dipylidium caninum, and Hydatigera taeniaeformis. The enzymes are primarily localized in the cuticle and nervous system, but with quantitative and qualitative differences from species to species. Inhibition studies suggest that the enzyme hydrolyzing both acetate and thiocholine substrates is an eserine-, fluoride-, and organic phosphate-sensitive cholinesterase. Partial inhibition by a strong ammonium base and hydrolysis of two different choline esters indicate that both acetylcholinesterase and pseudocholinesterase are involved.

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