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<dc:title xml:lang="en">Cardiovascular protective effects of Lindera obtusiloba</dc:title>
<dcterms:alternative xml:lang="fr">Les effets de "Lindera obtusiloba" pour la protection cardiovasculaire</dcterms:alternative>
<dc:subject xml:lang="fr">Maladies cardiovasculaires</dc:subject>
<dc:subject xml:lang="fr">Dysfonction endothéliale</dc:subject>
<dc:subject xml:lang="fr">Lindera obtusiloba</dc:subject>
<dc:subject xml:lang="fr">Hypertension</dc:subject>
<dc:subject xml:lang="fr">Diabètes</dc:subject>
<dc:subject xml:lang="fr">Athérosclérose</dc:subject>
<dc:subject xml:lang="fr">Thrombotiques</dc:subject>
<dc:subject xml:lang="fr">Agrégation plaquettaire</dc:subject>
<dc:subject xml:lang="en">Endothelial dysfunction</dc:subject>
<dc:subject xml:lang="en">Vascular diseases</dc:subject>
<dc:subject xml:lang="en">Lindera obtusiloba</dc:subject>
<dc:subject xml:lang="en">Hypertention</dc:subject>
<dc:subject xml:lang="en">Type 2 diabetic mice model</dc:subject>
<dc:subject xml:lang="en">Atherosclerotic mice model</dc:subject>
<dc:subject xml:lang="en">Thromboembolism mice model</dc:subject>
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<tef:elementdEntree autoriteExterne="02727067X" autoriteSource="Sudoc">Pharmacologie cardiovasculaire</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="064821242" autoriteSource="Sudoc.FMesh">Lindera</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La dysfonction endothéliale est un problème majeur au niveau mondial du fait de son implication dans de nombreuses pathologies. Ainsi, la dysfonction endothéliale est considérée comme un facteur pronostique défavorable dans les maladies cardiovasculaires. Les principaux mécanismes impliqués dans la dysfonction endothéliale sont la réduction de la formation et/ou de la biodisponibilité du monoxyde d’azote (NO), et la présence d’un stress oxydant. Le but de ce travail était d’évaluer des traitements phytothérapeutiques pouvant prévenir et/ou améliorer la dysfonction endothéliale. Le criblage de plus de trois cent plantes en fonction de leur capacité à induire une relaxation vasculaire et une inhibition de la NADPH oxydase (données confidentielles) a conduit à s’intéresser à Lindera obtusiloba. Ensuite, la capacité d’un extrait alcoolique de Lindera obtusiloba (LOE) à améliorer in vitro et in vivo la dysfonction endothéliale en activant la eNOS et en réduisant le stress oxydant a été testée. En conclusion, ces travaux indiquent que LOE possède des effets vasoprotecteurs in vitro et in vivo dans plusieurs modèles expérimentaux comme l’hypertension artérielle induite par l’angiotensine II, le diabète de type 2, l’athérosclérose et la thrombose pulmonaire. Ces effets bénéfiques impliquent, au moins en partie, la stimulation de la formation endothéliale du NO, la réduction du stress oxydant vasculaire via l’inhibition de la NADPH oxydase et l’inhibition de l’agrégation plaquettaire. Ainsi, LOE pourrait être un excellent candidat pour la prévention et/ou le traitement phytothérapeutique des maladies cardiovasculaires associées à une dysfonction endothéliale.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Endothelial dysfunction is a major worldwide topic because it is an important component and risk factor of a number of common human diseases. Therefore, endothelial dysfunction is considered a hallmark for vascular diseases, and has also been shown to be predictive of future adverse cardiovascular events. The main characteristic is a reduced NO production and bioavailability, and an increased vascular oxidative stress. The goal of the present research was to find a candidate for cardiovascular protective herbal medicine for the treatment of endothelial dysfunction. Through measurement of changes in isometric tension of porcine coronary artery rings, Lindera obtusiloba was selected amongst three hundred plants. Thereafter, the aim of our research was to determine whether an ethanolic extract of L. obtusiloba stems (LOE) improves endothelial dysfunction via activation of endothelial nitric oxide synthase and reduction of oxidative stress oxidase in vitro and in several animal models of cardiovascular diseases, and, if so, to elucidate the underlying mechanism. Altogether, the present findings indicate that LOE has vasoprotective effects both in vitro and in vivo including the Ang II-induced hypertention in rats, a type 2 diabetic mice model, and an atherosclerotic mice model, and a thromboembolism mice model, which involve its ability to stimulate the formation of NO, to reduce oxidative stress in the arterial wall, and to inhibit platelet aggregation. In conclusion, our studies reveal that LOE might be an interesting candidate as a cardiovascular protective herbal medicine in pathologies with endothelial dysfunction.</dcterms:abstract>
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