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Acute Oral Toxicity and Vasorelaxant Effects of Hydroethanolic Extract from Lannea microcarpa Engl. & K. Krause (Anacardiaceae) Trunk Barks in mice Aortas: Possible Involvement of Intracellular Ca²⁺ mobilization

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Pharmacology & Pharmacy 2023年第12期14卷 530-549页

作者： mathieu Nitiéma Bertrand Kafando Windingoudi Rimwagna Christian Ouédraogo Bibata Sawadogo Boukaré Kaboré Wendkouni Leila marie Esther Bélem-Kabré Tata Kadiatou Traoré Jean Claude Romaric Pingdwindé Ouédraogo Salfo Ouédraogo Lazare Belemnaba Aristide Traoré moussa Ouédraogo Noufou Ouédraogo Bondo Félix Kini Sylvin Ouédraogo laboratoirede recherche-développement de phytomédicaments et médicaments Institut de Recherche en Sciences de la Santé/Centre National de la Recherche Scientifique et Technologique Ouagadougou Burkina Faso laboratoirede développement du médicament (LAdmE)/CEA-CFOREm Université Joseph KI-ZERBO Ouagadougou Burkina Faso

Lannea microcrapa Engl. & K. Krause (Anacardiaceae) is a fruit and medicinal plant widely used in Burkina Faso. This plant is traditionally used in the treatment of hypertension. The aim of the present study was to evaluate the vasorelaxant effects of the hydroethanolic extract from Lannea microcarpa trunk barks (HE_ELm) on the aorta isolated from NmRI mice. Phytochemical screening by HPTLC, assay of phenolic and flavonoid compounds, assessment of antioxidant activity (dPPH, ABTS, FRAP, and LPO), and myography of HE_ELm (1 - 2000 μg/mL) on mice thoracic aortas in the presence and absence of endothelium were carried out. Endothelium-dependent and endothelium-independant vasodilation were assessed by cumulative addition of Ach (1 nm - 10 μm) on aortic rings precontracted with the thromboxane analogue A2 agonist, 9,11-dideoxy9α,11α-methanoepoxy PGF2α (U46619). L-NAmE was used to verify the involvement of NO production in the relaxation mechanism of the extract. Acute oral toxicity of HE_ELm was also evaluated. A phytochemical study revealed the presence of tannins, flavonoids, sterols and triterpenes, saponosides, and high levels of total phenolics and flavonoids. These compounds are thought to be responsible for the extract’s antioxidant and vasorelaxant properties. HE_ELm demonstrated significant antioxidant potential and induced aortic relaxation. Indeed, pharmacological parameters gave EC50 values ranging from 596.45 ± 95.82 μg/mL to 749.48 ± 133.40 μg/mL and Emax values from 85.51% ± 9.59% to 96.81% ± 8.60% for the three conditions of vasodilation of the extract (p > 0.05). A complete antagonism of the contractile effect of U46619 was noted with 1 mg/mL HE_ELm. These results suggest that HE_ELm induces aortic relaxation through a concentration-dependent, endothelium-independent mechanism, possibly involving intracellular calcium mobilization of vascular cells. Acute oral toxicity tests of HE_ELm (2000 mg/kg) showed no mortality or adverse effects, sugge

关键词： Lannea macrocarpa Hydroethanolic Extract Phytoconstituents Antioxidant Vasorelaxant Effects Safety

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