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The Occurrence and Distribution of 5-Hydroxytryptamine in Hymenolepis diminuta and H. nana

1978; American Society of Parasitologists; Volume: 64; Issue: 2 Linguagem: Inglês

10.2307/3279668

1937-2345

Marilyn B. Lee, Ernest Bueding, Everett L. Schiller,

Nematode management and characterization studies

The presence of 5-HT in Hymenolepis diminuta and Hymenolepis nana was detected by 2 biochemical methods and as yellow fluorescence in a histochemical method. In H. diminuta, 5-HT was found in a concentration of about 1.2 micron/g; this amount did not vary significantly in worms aged 6 to 18 days or more or in various regions of the worm. In H. nana, 5-HT was found in a concentration of about 1.8 micron/g. It was histochemically localized in H. diminuta and H. nana in a pattern similar to that of acetylcholinesterase previously described in these 2 cestodes, and it may be the opposing neuro-transmitter to acetylcholine. The lack of 5-HT in the vestigial rostellum of H. diminuta may be correlated with loss of function of this organ.