Localisation of serotonin and dopamine in Haemonchus contortus |
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Authors: | Rao Vijayaraghava T S Forrester Sean G Keller Kathy Prichard Roger K |
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Affiliation: | a Institute of Parasitology, McGill University, Macdonald Campus, 21,111 Lakeshore Road, Ste. Anne de Bellevue, Quebec, Canada H9X 3V9 b University of Ontario Institute of Technology, Faculty of Science, 2000 Simcoe Street North, Oshawa, ON, Canada L1H 7K4 |
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Abstract: | Serotonin and dopamine play important roles in the biology of nematodes where they exert their effect on feeding, locomotion and reproductive behavior. Haemonchus contortus, a parasitic nematode which infects small ruminants, is responsible for considerable economic losses in agriculture. In the current study we have mapped the localisation of these two neurotransmitters in this parasite using immuno-staining. Serotonin localised in amphidial and pharyngeal neurons in both adult female and male worms. Serotonin was also found in ray sensory neurons as well as in a few ventral cord motor neurons exclusively in adult males. Surprisingly, dopamine was only detected in the neuronal commissures linking the lateral and sub-lateral nerve cords in both sexes. We also studied the effect of these two molecules on female adult worms in vitro. Serotonin mainly inhibited movement whereas dopamine had a profound paralytic effect on the mid-body of the worms. |
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Keywords: | Biogenic amines Immuno-staining Neurotransmitter Amphidial neurons Commissures Nervous system Nematode anatomy |
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