Résumé
L’effet antihypertenseur de l’extrait aqueux (EA) des feuilles d’Inula viscosa a été évalué sur des rats rendus hypertendus par un traitement au L-NAME (NG-nitro-L-arginine méthyle ester). L’évolution de la pression artérielle est évaluée en mesurant la pression artérielle systolique (PAS) à l’aide d’un plétysmographe. Nos investigations ont porté sur trois groupes de rats: un groupe témoin, un groupe traité au L-NAME (30 mg/kg par jour) et un groupe traité au L-NAME (30 mg/kg par jour) et à l’EA d’Inula viscosa à 250 mg/kg par jour. Après quatre semaines de traitement, on note un développement de l’hypertension artérielle (HTA) chez le groupe traité au L-NAME (PAS = 164 ± 3 mmHg), alors que le groupe recevant le L-NAMEet l’EA d’Inula viscosa a développé une PAS de 145 ± 2 mmHg seulement. Ces résultats montrent un effet antihypertenseur de cet extrait. De plus, l’étude de l’effet cardiaque de l’EA d’Inula viscosa sur le modèle de coeur isolé et perfusé de rats selon la méthode de Langendorff a montré un effet inotrope négatif dosedépendant qui pourrait expliquer en partie l’effet antihypertenseur trouvé.
Abstract
Inula viscosa (Asteraceae) is amedicinal plant widely used by Mediterranean population in folk medicine to treat different diseases. The antihypertensive effect of the aqueous extract obtained from Inula viscosa leaves was studied in hypertensive rats. Systolic blood pressure was measured using the indirect tail-cuff plethysmographic method (TCP). Three groups of rats were used: control group received water; L-NAME treated group received NG-nitro-L-arginine methylester (30 mg/kg per day) and group received simultaneously L-NAME (30 mg/kg per day) and aqueous extract of Inula viscose (250 mg/kg per day). After four weeks of treatment, the group receiving the L-NAME alone have developed an arterial hypertension (systolic blood pressure (SBP) = 164 ± 3 mmHg), whereas the group receiving the L-NAME and the aqueous extract of Inula viscosa have developed a SBP of 145 ± 2 mmHg. These results showed that the studied extract prevented significantly the development of hypertension induced by L-NAME. Moreover, the study of the cardiac effect of the Inula viscosa aqueous extract on the model of isolated and perfused rat heart, according to the method of Langendorff, showed a dose-dependent negative inotropic effect, which may contribute to antihypertensive effect.
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Kattouf, J., Belmoukhtar, M., Harnafi, H. et al. Effet antihypertenseur des feuilles d’Inula viscosa . Phytothérapie 7, 309–312 (2009). https://doi.org/10.1007/s10298-009-0517-1
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DOI: https://doi.org/10.1007/s10298-009-0517-1