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Ce produit n'est pas destiné à diagnostiquer, traiter, guérir ou prévenir toute maladie. Ces déclarations n'ont pas été évaluées par la Food and Drug Administration.
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Ces informations sont fournies à titre éducatif uniquement et ne remplacent pas un avis médical professionnel, un diagnostic ou un traitement. Consultez toujours votre professionnel de santé avant d'utiliser des plantes, surtout si vous êtes enceinte, allaitez, prenez des médicaments ou avez une condition médicale.
Acokanthera oppositifolia
Arbuste sud-africain contenant des glycosides cardiaques hautement toxiques, utilisé dans des préparations traditionnelles extrêmement diluées pour la douleur et comme poison d'arc de chasse.
Acokanthera oppositifolia is a highly toxic South African shrub containing potent cardiac glycosides, including ouabain and acokantherine. Traditionally used as an arrow poison and for topical applications such as toothache and snakebite, it is strictly contraindicated for internal use due to its narrow therapeutic index. Modern research focuses on its cardiac glycoside constituents for potential cardiotonic applications, but clinical use remains limited by extreme toxicity.
The primary active compounds, ouabain and other cardenolides, act as selective inhibitors of the Na+/K+-ATPase pump, particularly the α1 and α2 isoforms. This inhibition increases intracellular sodium, which via the Na+/Ca2+ exchanger elevates intracellular calcium, enhancing myocardial contractility. At therapeutic doses, this produces positive inotropy; however, due to a narrow therapeutic window, minimal overdose leads to calcium overload, delayed afterdepolarizations, and fatal ventricular arrhythmias. Topical analgesic effects may involve local modulation of nociceptive ion channels, but mechanisms remain poorly characterized.
Arbuste sud-africain contenant des glycosides cardiaques hautement toxiques, utilisé dans des préparations traditionnelles extrêmement diluées pour la douleur et comme poison d'arc de chasse.
Acokanthera oppositifolia is a highly toxic South African shrub containing potent cardiac glycosides, including ouabain and acokantherine. Traditionally used as an arrow poison and for topical applications such as toothache and snakebite, it is strictly contraindicated for internal use due to its narrow therapeutic index. Modern research focuses on its cardiac glycoside constituents for potential cardiotonic applications, but clinical use remains limited by extreme toxicity.
The primary active compounds, ouabain and other cardenolides, act as selective inhibitors of the Na+/K+-ATPase pump, particularly the α1 and α2 isoforms. This inhibition increases intracellular sodium, which via the Na+/Ca2+ exchanger elevates intracellular calcium, enhancing myocardial contractility. At therapeutic doses, this produces positive inotropy; however, due to a narrow therapeutic window, minimal overdose leads to calcium overload, delayed afterdepolarizations, and fatal ventricular arrhythmias. Topical analgesic effects may involve local modulation of nociceptive ion channels, but mechanisms remain poorly characterized.