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The effect of the anthelmintic emodepside at the neuromuscular junction of the parasitic nematode Ascaris suum

The effect of the anthelmintic emodepside at the neuromuscular junction of the parasitic nematode Ascaris suum
The effect of the anthelmintic emodepside at the neuromuscular junction of the parasitic nematode Ascaris suum
Here we report on the action of the novel cyclo-depsipeptide anthelmintic, emodepside, on the body wall muscle of the parasitic nematode, Ascaris suum. Emodepside caused (i) muscle relaxation, (ii) inhibition of muscle contraction elicited by either acetylcholine (ACh), or the neuropeptide, AF2 (KHEYLRFamide) and (iii) a rapid relaxation of muscle tonically contracted by ACh. The inhibitory action of emodepside on the response to ACh was not observed in a denervated muscle strip, indicating that it may exert this action through the nerve cord, and not directly on the muscle. Electrophysiological recordings showed emodepside elicited a Ca++-dependent hyperpolarization of muscle cells. Furthermore, the response to emodepside was dependent on extracellular K+, similar to the action of the inhibitory neuropeptides PF1 and PF2 (SDPNFLRFamide and SADPNFLRFamide). Thus emodepside may act at the neuromuscular junction to stimulate release of an inhibitory neurotransmitter or neuromodulator, with a similar action to the PF1/PF2 neuropeptides.
anthelmintic, ascaris suum, neuropeptide
0031-1820
79-86
Willson, J.
3fe4cbeb-fd6f-4e81-af4f-3b753e358e5c
Amliwala, K.
e71463eb-6480-4395-8e2a-57a005809be8
Harder, A.
0cf8ea99-09fd-416c-ab07-4c7f4d63d44c
Holden-Dye, L.
8032bf60-5db6-40cb-b71c-ddda9d212c8e
Walker, R.J.
b6597591-587e-488a-8a54-89156c42ce8d
Willson, J.
3fe4cbeb-fd6f-4e81-af4f-3b753e358e5c
Amliwala, K.
e71463eb-6480-4395-8e2a-57a005809be8
Harder, A.
0cf8ea99-09fd-416c-ab07-4c7f4d63d44c
Holden-Dye, L.
8032bf60-5db6-40cb-b71c-ddda9d212c8e
Walker, R.J.
b6597591-587e-488a-8a54-89156c42ce8d

Willson, J., Amliwala, K., Harder, A., Holden-Dye, L. and Walker, R.J. (2003) The effect of the anthelmintic emodepside at the neuromuscular junction of the parasitic nematode Ascaris suum. Parasitology, 126 (1), 79-86. (doi:10.1017/S0031182002002639).

Record type: Article

Abstract

Here we report on the action of the novel cyclo-depsipeptide anthelmintic, emodepside, on the body wall muscle of the parasitic nematode, Ascaris suum. Emodepside caused (i) muscle relaxation, (ii) inhibition of muscle contraction elicited by either acetylcholine (ACh), or the neuropeptide, AF2 (KHEYLRFamide) and (iii) a rapid relaxation of muscle tonically contracted by ACh. The inhibitory action of emodepside on the response to ACh was not observed in a denervated muscle strip, indicating that it may exert this action through the nerve cord, and not directly on the muscle. Electrophysiological recordings showed emodepside elicited a Ca++-dependent hyperpolarization of muscle cells. Furthermore, the response to emodepside was dependent on extracellular K+, similar to the action of the inhibitory neuropeptides PF1 and PF2 (SDPNFLRFamide and SADPNFLRFamide). Thus emodepside may act at the neuromuscular junction to stimulate release of an inhibitory neurotransmitter or neuromodulator, with a similar action to the PF1/PF2 neuropeptides.

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More information

Published date: January 2003
Keywords: anthelmintic, ascaris suum, neuropeptide

Identifiers

Local EPrints ID: 56382
URI: http://eprints.soton.ac.uk/id/eprint/56382
ISSN: 0031-1820
PURE UUID: dfe95d11-0ea0-4b9d-8493-0e70e369effa
ORCID for L. Holden-Dye: ORCID iD orcid.org/0000-0002-9704-1217

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Date deposited: 08 Aug 2008
Last modified: 16 Mar 2024 02:35

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Contributors

Author: J. Willson
Author: K. Amliwala
Author: A. Harder
Author: L. Holden-Dye ORCID iD
Author: R.J. Walker

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