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The Role of 5-Hydroxytryptamine (5-HT; Serotonin) in Glucose Transport, Intermediary Carbohydrate Metabolism and Helminth Neurobiology

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Comparative Biochemistry of Parasitic Helminths

Abstract

5-HT is synthesised in the enterochromaffin cells of the intestinal mucosa of mammals, particularly in the proximal intestine. 5-HT is secreted into the intestinal lumen; some enters the blood stream where it is taken up by blood platelets. 5-HT stimulates glucose uptake by Hymenolepis diminuta and Schistosoma mansoni, but reduces worm glycogen levels; 5-HT does not stimulate glucose uptake in H. microstoma, but does reduce glycogen levels. The primary function of 5-HT appears to be an increase in the rate of carbon flux through the intermediary pathways of carbohydrate metabolism. 5-HT also acts as putative neurotransmitter in Fasciola hepatica, H. diminuta and Dipylidium caninum. In H. diminuta 5-HT has more consistent excitatory effects on the circular muscles than on the longitudinal muscles. Motility responses to 5-HT by the scolex suckers and the strobila are concentration dependent There is evidence that glutamate, and not 5-HT, acts as an excitatoiy putative neurotransmitter on the longitudinal musculature of H. diminuta.

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Mettrick, D.F. (1989). The Role of 5-Hydroxytryptamine (5-HT; Serotonin) in Glucose Transport, Intermediary Carbohydrate Metabolism and Helminth Neurobiology. In: Bennet, EM., Behm, C., Bryant, C. (eds) Comparative Biochemistry of Parasitic Helminths. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0833-8_2

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