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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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Taxus brevifolia
Pacific Northwest coniferous tree original source of paclitaxel; nearly harvested to extinction for cancer drug production.
Taxus brevifolia, the Pacific yew, is a coniferous tree historically used in Native American medicine for minor ailments and later recognized as the original source of paclitaxel, a potent anticancer agent. Its bark contains the diterpenoid paclitaxel, along with toxic taxine alkaloids, making the raw plant extremely poisonous. Today, paclitaxel is produced via semi-synthesis from 10-deacetylbaccatin, a more sustainable precursor found in other yew species, while T. brevifolia itself is primarily of conservation interest.
Paclitaxel exerts its anticancer effects by binding to β-tubulin, stabilizing microtubules and preventing their depolymerization, thereby arresting cell division at the G2/M phase and inducing apoptosis. The taxine alkaloids, particularly taxine B, act as cardiotoxins by blocking voltage-gated sodium and calcium channels in cardiac myocytes, leading to bradycardia, hypotension, and potentially fatal arrhythmias. Baccatin III serves as a key intermediate in paclitaxel semisynthesis but lacks significant direct pharmacological activity.
Pacific Northwest coniferous tree original source of paclitaxel; nearly harvested to extinction for cancer drug production.
Taxus brevifolia, the Pacific yew, is a coniferous tree historically used in Native American medicine for minor ailments and later recognized as the original source of paclitaxel, a potent anticancer agent. Its bark contains the diterpenoid paclitaxel, along with toxic taxine alkaloids, making the raw plant extremely poisonous. Today, paclitaxel is produced via semi-synthesis from 10-deacetylbaccatin, a more sustainable precursor found in other yew species, while T. brevifolia itself is primarily of conservation interest.
Paclitaxel exerts its anticancer effects by binding to β-tubulin, stabilizing microtubules and preventing their depolymerization, thereby arresting cell division at the G2/M phase and inducing apoptosis. The taxine alkaloids, particularly taxine B, act as cardiotoxins by blocking voltage-gated sodium and calcium channels in cardiac myocytes, leading to bradycardia, hypotension, and potentially fatal arrhythmias. Baccatin III serves as a key intermediate in paclitaxel semisynthesis but lacks significant direct pharmacological activity.