Characterization of 5-HT receptors in the parasitic nematode, Ascaris suum
Trim, J.E., Holden-Dye, L., Willson, J., Lockyer, M. and Walker, R.J. (2001) Characterization of 5-HT receptors in the parasitic nematode, Ascaris suum. Parasitology, 122, (2), 207-217. (doi:10.1017/S003118200100703X).
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Description/Abstract
The pharmacological profiles of the 5-hydroxytryptamine (5-HT) receptors on Ascaris suum pharyngeal and somatic body wall muscles were investigated. The mechanisms involved following activation of these receptors were also studied. 5-HT activated and maintained pumping in isolated pharynxes with an EC-50 value of 44±1·7μM. The 5-HT agonists, tryptamine, sumatriptan 8-OH-DPAT and 5-carboxyamidotryptamine all failed to stimulate pumping. The 5-HT2 antagonist, ketanserin, initially excited and then inhibited pumping while the 5-HT3 antagonist, ondansetron, had no effect. 5-HT and 5-HT agonists, 8-OH-DPAT, 5-carboxyamidotryptamine, α-methyl-5-HT and tryptamine all inhibited ACh-induced contractions of a somatic body wall muscle strip. Ketanserin partially blocked the inhibitory effect of α-methyl-5-HT and ACh-induced contractions while the 5-HT uptake blocker, fluoxetine, potentiated the effect of 5-HT on ACh-induced contractions. Basal levels of cAMP, 1540±232pmol/mg, in pharyngeal muscle and 1721±134pmol/mg, somatic body wall muscle, were both increased by forskolin. 5-HT had no effect on pharyngeal muscle cAMP levels but raised cAMP levels in somatic body wall muscle, e.g. 100μM 5-HT, raised the level to 2851±212pmol/mg and 1000μM raised levels to 4578±1234pmol/mg., 1000μM, increased inositol phosphate levels in pharyngeal muscle. These results provide some evidence for a 5-HT2-like receptor on pharyngeal muscle. In contrast, the situation on somatic body wall muscle is more confusing since the pharmacological profile partly indicates a 5-HT2-like receptor but this receptor is linked to a rise in cAMP levels. Further studies are required to resolve the position but they must be based on the rational design of ligands specifically for nematode 5-HT receptors and not simply using ligands developed for the classification of mammalian 5-HT receptors. Such a design must take into account data from molecular biology studies of nematode 5-HT receptors.
| Item Type: | Article |
|---|---|
| ISSNs: | 0031-1820 (print) |
| Related URLs: | |
| Keywords: | 5-hydroxytryptamine, ascaris suum, nematode, acetylcholine, cAMP |
| Subjects: | Q Science > Q Science (General) R Medicine > R Medicine (General) |
| Divisions: | University Structure - Pre August 2011 > School of Biological Sciences |
| Item ID: | 56524 |
| Date Deposited: | 08 Aug 2008 |
| Last Modified: | 01 Jun 2011 14:45 |
| Contributors: | Trim, J.E. (Author) Holden-Dye, L. (Author) Willson, J. (Author) Lockyer, M. (Author) Walker, R.J. (Author) |
| Date: | 21 May 2001 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/56524 |
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