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Pharmaceuticals (Basel, Switzerland)2021; 14(6); 505; doi: 10.3390/ph14060505

Action of Carvacrol on Parascaris sp. and Antagonistic Effect on Nicotinic Acetylcholine Receptors.

Abstract: sp. is the only ascarid parasitic nematode in equids and one of the most threatening infectious organisms in horses. Only a limited number of compounds are available for treatment of horse helminthiasis, and sp. worms have developed resistance to the three major anthelmintic families. In order to overcome the appearance of resistance, there is an urgent need for new therapeutic strategies. The active ingredients of herbal essential oils are potentially effective antiparasitic drugs. Carvacrol is one of the principal chemicals of essential oil from , , , , and herbs. However, the antiparasitic mode of action of carvacrol is poorly understood. Here, the objective of the work was to characterize the activity of carvacrol on sp. nicotinic acetylcholine receptor (nAChR) function both in vivo with the use of worm neuromuscular flap preparations and in vitro with two-electrode voltage-clamp electrophysiology on nAChRs expressed in oocytes. We developed a neuromuscular contraction assay for body flaps and obtained acetylcholine concentration-dependent contraction responses. Strikingly, we observed that 300 µM carvacrol fully and irreversibly abolished sp. muscle contractions elicited by acetylcholine. Similarly, carvacrol antagonized acetylcholine-induced currents from both the nicotine-sensitive AChR and the morantel-sensitive AChR subtypes. Thus, we show for the first time that body muscle flap preparation is a tractable approach to investigating the pharmacology of sp. neuromuscular system. Our results suggest an intriguing mode of action for carvacrol, being a potent antagonist of muscle nAChRs of sp. worms, which may account for its antiparasitic potency.
Publication Date: 2021-05-26 PubMed ID: 34073197PubMed Central: PMC8226574DOI: 10.3390/ph14060505Google Scholar: Lookup
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  • Journal Article

Summary

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The research investigates the effects of carvacrol, a compound in certain essential oils, on Parascaris sp., a parasitic worm in horses and discusses how it inhibits the function of specific receptors in these worms, potentially providing an effective treatment.

Objective of the Research

  • The research aimed to understand the modality, or mode of action, of carvacrol, an active ingredient in essential oils derived from various herbs, on Parascaris sp., a type of parasitic worm prevalent in horses.

Methods of the Study

  • This study examined the effects of carvacrol on the worm’s nicotinic acetylcholine receptor (nAChR) both live (in vivo) and in a controlled lab setting (in vitro).
  • Neuromuscular flap preparations of the worm were used for in vivo studies, while the in vitro studies involved acetylcholine receptors expressed in Xenopus oocytes (immature egg cells commonly used in scientific research).
  • A neuromuscular contraction assay was also developed for Parascaris sp. body flaps, providing acetylcholine concentration-dependent contraction responses.

Findings of the Study

  • The assays revealed that a concentration of 300 µM carvacrol completely abolished the parasitic worm’s muscle contractions elicited by acetylcholine, suggesting an antagonistic effect on the nAChR.
  • The in vitro tests also revealed that carvacrol inhibited acetylcholine-induced currents from both the nicotine-sensitive AChR and the morantel-sensitive AChR subtypes.

Significance of the Study

  • The research demonstrates the potential of carvacrol as an influential antagonist of muscle nAChRs in Parascaris sp. worms, which may account for its significant antiparasitic properties.
  • This study is the first to show that body muscle flap preparation can help investigate the pharmacology of the Parascaris sp. neuromuscular system, offering a unique approach to exploring potential treatments for parasitic infections in horses.

Cite This Article

APA
Trailovic SM, Rajkovic M, Marjanovic DS, Neveu C, Charvet CL. (2021). Action of Carvacrol on Parascaris sp. and Antagonistic Effect on Nicotinic Acetylcholine Receptors. Pharmaceuticals (Basel), 14(6), 505. https://doi.org/10.3390/ph14060505

Publication

ISSN: 1424-8247
NlmUniqueID: 101238453
Country: Switzerland
Language: English
Volume: 14
Issue: 6
PII: 505

Researcher Affiliations

Trailovic, Sasa M
  • Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Belgrade, 11000 Belgrade, Serbia.
Rajkovic, Milan
  • Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Belgrade, 11000 Belgrade, Serbia.
  • Department of Biology, Faculty of Veterinary Medicine, University of Belgrade, 11000 Belgrade, Serbia.
Marjanovic, Djordje S
  • Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Belgrade, 11000 Belgrade, Serbia.
Neveu, Cédric
  • INRAE, Université de Tours, ISP, 37380 Nouzilly, France.
Charvet, Claude L
  • INRAE, Université de Tours, ISP, 37380 Nouzilly, France.

Conflict of Interest Statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses or interpretation of data; in the writing of the manuscript or in the decision to publish the results.

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Citations

This article has been cited 1 times.
  1. Cain JL, Nielsen MK. The equine ascarids: resuscitating historic model organisms for modern purposes.. Parasitol Res 2022 Oct;121(10):2775-2791.
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