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Anti-nociceptive effect of Arbutus andrachne L. methanolic leaf extract mediated by CB1, TRPV1 and PPARs in mouse pain models

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Abstract

Arbutus andrachne L. is a medicinal plant that grows in Jordan and has many valuable effects. In the present study, the anti-nociceptive effect of A. andrachne methanolic leaf extract was determined in mice using thermal and chemical tests. Our findings show that different doses of A. andrachne extract reduced the number of writhings significantly compared to control group. The leaf extract also reduced the time of paw licking in the early and late phases of formalin test. In all the conducted tests, 300 mg/kg body wt. was the best effective dose. A peroxisome proliferator-activated receptor alpha (PPARα) antagonist reversed the action of the plant extract in the early phase of formalin test while antagonists of the PPARα, PPAR gamma (PPARγ) and cannabinoid 1 (CB1) receptors were responsible for abolishing its effect in the late phase of this test. Also, the extract administration increased the latency time in hot plate and tail flick, an effect that was reversed by the antagonists of PPARγ, CB1 and transient receptor potential vanilloid 1 (TRPV1). No effect was noticed for α2-adrenergic receptor antagonist in the action of A. andrachne in any of the conducted tests in this study. Furthermore, analysis of the constituents in the methanolic leaf extract using liquid chromatography mass spectrometry (LCMS) showed that the extract is rich in compounds that have anti-nociceptive and/or anti-inflammatory effects such as arbutin, rutin, linalool, linoleic acid, gallic acid, lauric acid, myristic acid, hydroquinone, β-sitosterol, ursolic acid, isoquercetin, quercetin, (+)-gallocatechin, kaempferol, α-tocopherol, myricetin 3-O-rhamnoside and catechin gallate. In conclusion, A. andrachne showed promising anti-nociceptive effects in thermal and chemical models of pain. These findings can open an avenue for natural pain relief.

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Acknowledgements

The authors acknowledge the Deanship of Scientific Research, The University of Jordan for the financial support.

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  1. Department of Biological Sciences, Faculty of Science, The University of Jordan, Amman, 11942, Jordan

    Sahar M. Jaffal & Sawsan A. Oran

  2. Department of Anatomy and Histology, Faculty of Medicine, The University of Jordan, Amman, 11942, Jordan

    Mohammad Alsalem

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  1. Sahar M. Jaffal
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Jaffal, S.M., Oran, S.A. & Alsalem, M. Anti-nociceptive effect of Arbutus andrachne L. methanolic leaf extract mediated by CB1, TRPV1 and PPARs in mouse pain models. Inflammopharmacol 28, 1567–1577 (2020). https://doi.org/10.1007/s10787-020-00746-y

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