<abstract xmlns="http://www.w3.org/1999/xhtml">

Resistance of parasitic nematodes to anthelmintic drugs is a growing problem in human and veterinary medicine. The molecular mechanisms by which nematodes become resistant are different, but certainly one of the possible processes involves changing the drug binding site on the specific receptor. The significance of changes in individual subtypes of nicotinic acetylcholine receptors (nAChRs) for the development of resistance has not been clarified in detail. This study investigates the interaction of antinematodal drugs, agonist of different types of nAChRs and carvacrol with gamma aminobutyric acid (GABA) on the contractions of parasitic nematode <italic>A. suum</italic>. In our study, GABA (3 μM) produced significant increase of contractile EC50 value for pyrantel, and nonsignificant for bephenium and morantel, from 8.44 to 28.11 nM, 0.62 to 0.96 µM, and 3.72 to 5.69 nM, respectively. On the other hand, the maximal contractile effect (<italic>R</italic>
max) did not change in the presence of GABA. However, when <italic>A. summ</italic> muscle flaps were incubated with GABA 3 μM and carvacrol 100 μM, the EC50 value of pyrantel, bephenium, and morantel was increased significantly to 44.62 nM, 1.40 μM, and nonsignificantly to 7.94 nM, respectively. Furthermore, <italic>R</italic>
max decreased by 70, 60, and 65%. Presented results indicate that the combined use of GABA receptor agonists and nicotinic receptor antagonists can effectively inhibit the neuromuscular system of nematodes, even when one of the nicotinic receptor subtypes is dysfunctional, due to the potential development of resistance.
</abstract>

Resistance of parasitic nematodes to anthelmintic drugs is a growing problem in human and veterinary medicine. The molecular mechanisms by which nematodes become resistant are different, but certainly one of the possible processes involves changing the drug binding site on the specific receptor. The significance of changes in individual subtypes of nicotinic acetylcholine receptors (nAChRs) for the development of resistance has not been clarified in detail. This study investigates the interaction of antinematodal drugs, agonist of different types of nAChRs and carvacrol with gamma aminobutyric acid (GABA) on the contractions of parasitic nematode A. suum. In our study, GABA (3 μM) produced significant increase of contractile EC50 value for pyrantel, and nonsignificant for bephenium and morantel, from 8.44 to 28.11 nM, 0.62 to 0.96 µM, and 3.72 to 5.69 nM, respectively. On the other hand, the maximal contractile effect (R
max) did not change in the presence of GABA. However, when A. summ muscle flaps were incubated with GABA 3 μM and carvacrol 100 μM, the EC50 value of pyrantel, bephenium, and morantel was increased significantly to 44.62 nM, 1.40 μM, and nonsignificantly to 7.94 nM, respectively. Furthermore, R
max decreased by 70, 60, and 65%. Presented results indicate that the combined use of GABA receptor agonists and nicotinic receptor antagonists can effectively inhibit the neuromuscular system of nematodes, even when one of the nicotinic receptor subtypes is dysfunctional, due to the potential development of resistance.

<article-title xml:lang="en">Interaction of agonists of a different subtype of the nAChR and carvacrol with GABA in <italic>Ascaris suum</italic> somatic muscle contractions

Journal of Nematology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Interaction of agonists of a different subtype of the nAChR and carvacrol with GABA in  somatic muscle contractions

Resistance of parasitic nematodes to anthelmintic drugs is a growing problem in human and veterinary medicine. The molecular mechanisms by which nematodes...

Interaction of agonists of a different subtype of the nAChR and carvacrol with GABA in Ascaris suum somatic muscle contractions

Published Online: Jan 01, 2021

Page range: 1 - 8

DOI: https://doi.org/10.21307/jofnem-2021-022

Keywords
nAChR, GABA, Carvacrol, Interaction, Resistance

© 2021 Authors, published by Sciendo.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Interaction of agonists of a different subtype of the nAChR and carvacrol with GABA in Ascaris suum somatic muscle contractions

Published Online: Jan 01, 2021

Page range: 1 - 8

DOI: https://doi.org/10.21307/jofnem-2021-022

KeywordsnAChR, GABA, Carvacrol, Interaction, Resistance

© 2021 Authors, published by Sciendo.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
nAChR, GABA, Carvacrol, Interaction, Resistance