4 research outputs found

    Neoboutonia melleri var velutina (Prain) Pax & K. Hoffm (Euphorbiaceae) : évaluation des propriétés hépatoprotectrice et antioxydante

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    Hepatitis is a liver inflammation caused by different agents. It remains a public health problem worldwide since current treatment methods are increasingly expensive. Medicinal plants are known as an important source of new molecules. A better knowledge of these natural resources appears interesting to develop alternative treatments. The aim of this study was then to evaluate the hepatoprotective effect of Neoboutonia velutina (NV), a Cameroonian medicinal plant, and decipher underlying mechanisms.NV aqueous (NVH) and ethanol (NVE) extracts have been prepared referring to the traditional use. Phytochemical and toxicological analyses were performed in vitro and in vivo. Similarly, extracts antioxidant and antiinflammatory potential was assessed on cells (or not) and in mice. Acute hepatitis was induced with carbon tetrachloride (CCl4) or Concanavalin A (ConA), in mice receiving or not different extracts doses by gavage. NVH fractionation was done to identify active compounds.NVE was containing sterols and polyterpens. Though it displayed a high radical scavenging capacity compared to NVH, it appeared more toxic. Thus, for assays, priority was given to NVH, containing saponins and glycosides. NVH showed a radical scavenging capacity with a very low toxicity. It remarkably protected mice from CCl4-induced liver injuries. As shown by significant dose dependent transaminases serum level decrease and liver injury important limitation. These, associated with NVH anti-inflammatory capacity. Furthermore, NVH fractionation led to a radical scavenging compound isolation. Otherwise, in ConA model NVH displayed weak effects. These findings suggested a selective NVH efficacy. In summary, we showed that NVH presents a model dependent hepatoprotective effect that may be mediated at least, through its radical scavenging property. Our findings are in line with Neoboutonia velutina traditional use and provide the first scientific arguments in favor of the traditional use of NV against hepatitis. Additional studies are needed to better understand NV mechanisms of action and then ensured its safe use. NVE mimics the traditional preparation. Even though that extract appeared toxic, it exhibited a therapeutic potential that could be interesting at very low doses.L’hĂ©patite est une inflammation du foie pouvant ĂȘtre causĂ©e par divers agents. Elle reste un problĂšme de santĂ© publique majeur dans le monde, compte tenu du coĂ»t de plus en plus Ă©levĂ© des mĂ©dicaments. Une meilleure comprĂ©hension des mĂ©canismes d’action des plantes mĂ©dicinales apparaĂźt intĂ©ressante pour dĂ©velopper des traitements alternatifs. L’objectif de cette Ă©tude Ă©tait donc d’évaluer les propriĂ©tĂ©s hĂ©patoprotectrice, puis d’identifier les mĂ©canismes qui pourraient soutendre l’action de Neoboutonia velutina (NV), une plante mĂ©dicinale camerounaise.Les extraits aqueux (NVH) et Ă©thanolique (NVE) de NV ont Ă©tĂ© prĂ©parĂ©s, se rĂ©fĂ©rant Ă  la prĂ©paration traditionnelle. Les analyses phytochimique et toxicologique ont Ă©tĂ© effectuĂ©es et le potentiel antioxydant Ă©valuĂ© in vitro et in vivo. De mĂȘme, l’effet antiinflammatoire des deux extraits a Ă©tĂ© Ă©valuĂ© sur les cellules et chez la souris. L’hĂ©patite aiguĂ« a Ă©tĂ© induite par le tĂ©trachlorure de carbone (CCl4) ou la Concanavalin A (ConA), chez la souris qui recevait ou non diffĂ©rentes doses d’extrait par gavage. De plus, l’extrait aqueux a Ă©tĂ© fractionnĂ© pour l’identification des composĂ©s bioactifs.NVE contiendrait ainsi des stĂ©rols et polyterpĂšnes. Cet extrait a prĂ©sentĂ© une capacitĂ© anti-radicalaire meilleure que celle de NVH. Mais, il s’est avĂ©rĂ© plus toxique que NVH; ce qui a limitĂ© nos investigations sur cet extrait. En revanche, NVH contiendrait des saponines et glycosides et a rĂ©vĂ©lĂ© une trĂšs faible toxicitĂ©. De plus, un remarquable effet protecteur de NVH a Ă©tĂ© notĂ© contre les dommages causĂ©s par le CCl4. Cet effet protecteur s’est traduit par une diminution dose-dĂ©pendante et significative des transaminases sĂ©riques et une importante diminution des lĂ©sions hĂ©patiques. Ceci, associĂ© Ă  la capacitĂ© antiinflammatoire in vitro et in vivo. En outre, un composĂ© anti-radicalaire a Ă©tĂ© isolĂ© de NVH. Par ailleurs, dans le modĂšle ConA, NVH n’a prĂ©sentĂ© qu’un faible effet protecteur. Ce qui suggĂšre une efficacitĂ© sĂ©lective de cet extrait.En conclusion, nous avons dĂ©montrĂ© dans notre Ă©tude, un effet hĂ©patoprotecteur de NV Ă  travers l’extrait aqueux qui a prĂ©sentĂ© un effet hĂ©patoprotecteur modĂšle dĂ©pendant. Cet effet, semble ĂȘtre mĂ©diĂ© au moins, par la capacitĂ© anti-radicalaire de la plante. Nos rĂ©sultats prĂ©sentent ainsi les premiers arguments en faveur de l’utilisation traditionnelle de NV contre les hĂ©patites. Des Ă©tudes plus poussĂ©es permettraient de mieux comprendre les mĂ©canismes d’action de cette plante et d’exploiter au mieux son potentiel thĂ©rapeutique, sans risque de toxicitĂ©. Ainsi, bien que prĂ©sentant une toxicitĂ©, l’extrait Ă©thanolique qui mime la prĂ©paration traditionnelle, a rĂ©vĂ©lĂ© un potentiel thĂ©rapeutique qui pourrait ĂȘtre trĂšs intĂ©ressant Ă  trĂšs faibles doses

    Neoboutonia melleri var velutina (Prain) Pax & K. Hoffm (Euphorbiaceae) : hepatoprotective and antioxidant properties assessment

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    L’hĂ©patite est une inflammation du foie pouvant ĂȘtre causĂ©e par divers agents. Elle reste un problĂšme de santĂ© publique majeur dans le monde, compte tenu du coĂ»t de plus en plus Ă©levĂ© des mĂ©dicaments. Une meilleure comprĂ©hension des mĂ©canismes d’action des plantes mĂ©dicinales apparaĂźt intĂ©ressante pour dĂ©velopper des traitements alternatifs. L’objectif de cette Ă©tude Ă©tait donc d’évaluer les propriĂ©tĂ©s hĂ©patoprotectrice, puis d’identifier les mĂ©canismes qui pourraient soutendre l’action de Neoboutonia velutina (NV), une plante mĂ©dicinale camerounaise.Les extraits aqueux (NVH) et Ă©thanolique (NVE) de NV ont Ă©tĂ© prĂ©parĂ©s, se rĂ©fĂ©rant Ă  la prĂ©paration traditionnelle. Les analyses phytochimique et toxicologique ont Ă©tĂ© effectuĂ©es et le potentiel antioxydant Ă©valuĂ© in vitro et in vivo. De mĂȘme, l’effet antiinflammatoire des deux extraits a Ă©tĂ© Ă©valuĂ© sur les cellules et chez la souris. L’hĂ©patite aiguĂ« a Ă©tĂ© induite par le tĂ©trachlorure de carbone (CCl4) ou la Concanavalin A (ConA), chez la souris qui recevait ou non diffĂ©rentes doses d’extrait par gavage. De plus, l’extrait aqueux a Ă©tĂ© fractionnĂ© pour l’identification des composĂ©s bioactifs.NVE contiendrait ainsi des stĂ©rols et polyterpĂšnes. Cet extrait a prĂ©sentĂ© une capacitĂ© anti-radicalaire meilleure que celle de NVH. Mais, il s’est avĂ©rĂ© plus toxique que NVH; ce qui a limitĂ© nos investigations sur cet extrait. En revanche, NVH contiendrait des saponines et glycosides et a rĂ©vĂ©lĂ© une trĂšs faible toxicitĂ©. De plus, un remarquable effet protecteur de NVH a Ă©tĂ© notĂ© contre les dommages causĂ©s par le CCl4. Cet effet protecteur s’est traduit par une diminution dose-dĂ©pendante et significative des transaminases sĂ©riques et une importante diminution des lĂ©sions hĂ©patiques. Ceci, associĂ© Ă  la capacitĂ© antiinflammatoire in vitro et in vivo. En outre, un composĂ© anti-radicalaire a Ă©tĂ© isolĂ© de NVH. Par ailleurs, dans le modĂšle ConA, NVH n’a prĂ©sentĂ© qu’un faible effet protecteur. Ce qui suggĂšre une efficacitĂ© sĂ©lective de cet extrait.En conclusion, nous avons dĂ©montrĂ© dans notre Ă©tude, un effet hĂ©patoprotecteur de NV Ă  travers l’extrait aqueux qui a prĂ©sentĂ© un effet hĂ©patoprotecteur modĂšle dĂ©pendant. Cet effet, semble ĂȘtre mĂ©diĂ© au moins, par la capacitĂ© anti-radicalaire de la plante. Nos rĂ©sultats prĂ©sentent ainsi les premiers arguments en faveur de l’utilisation traditionnelle de NV contre les hĂ©patites. Des Ă©tudes plus poussĂ©es permettraient de mieux comprendre les mĂ©canismes d’action de cette plante et d’exploiter au mieux son potentiel thĂ©rapeutique, sans risque de toxicitĂ©. Ainsi, bien que prĂ©sentant une toxicitĂ©, l’extrait Ă©thanolique qui mime la prĂ©paration traditionnelle, a rĂ©vĂ©lĂ© un potentiel thĂ©rapeutique qui pourrait ĂȘtre trĂšs intĂ©ressant Ă  trĂšs faibles doses.Hepatitis is a liver inflammation caused by different agents. It remains a public health problem worldwide since current treatment methods are increasingly expensive. Medicinal plants are known as an important source of new molecules. A better knowledge of these natural resources appears interesting to develop alternative treatments. The aim of this study was then to evaluate the hepatoprotective effect of Neoboutonia velutina (NV), a Cameroonian medicinal plant, and decipher underlying mechanisms.NV aqueous (NVH) and ethanol (NVE) extracts have been prepared referring to the traditional use. Phytochemical and toxicological analyses were performed in vitro and in vivo. Similarly, extracts antioxidant and antiinflammatory potential was assessed on cells (or not) and in mice. Acute hepatitis was induced with carbon tetrachloride (CCl4) or Concanavalin A (ConA), in mice receiving or not different extracts doses by gavage. NVH fractionation was done to identify active compounds.NVE was containing sterols and polyterpens. Though it displayed a high radical scavenging capacity compared to NVH, it appeared more toxic. Thus, for assays, priority was given to NVH, containing saponins and glycosides. NVH showed a radical scavenging capacity with a very low toxicity. It remarkably protected mice from CCl4-induced liver injuries. As shown by significant dose dependent transaminases serum level decrease and liver injury important limitation. These, associated with NVH anti-inflammatory capacity. Furthermore, NVH fractionation led to a radical scavenging compound isolation. Otherwise, in ConA model NVH displayed weak effects. These findings suggested a selective NVH efficacy. In summary, we showed that NVH presents a model dependent hepatoprotective effect that may be mediated at least, through its radical scavenging property. Our findings are in line with Neoboutonia velutina traditional use and provide the first scientific arguments in favor of the traditional use of NV against hepatitis. Additional studies are needed to better understand NV mechanisms of action and then ensured its safe use. NVE mimics the traditional preparation. Even though that extract appeared toxic, it exhibited a therapeutic potential that could be interesting at very low doses

    Neoboutonia melleri var velutina Prain: in vitro and in vivo hepatoprotective effects of the aqueous stem bark extract on acute hepatitis models

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    International audienceBackgroundHepatitis is a liver inflammation caused by different agents and remains a public health problem worldwide. Medicinal plants are an important source of new molecules being considered for treatment of this disease. Our work aims at evaluating the hepatoprotective properties of Neoboutonia velutina, a Cameroonian medicinal plant.MethodsThe aqueous extract has been prepared using phytochemical methods. HepG2 cells were used to assess anti-inflammatory properties of the extract at different concentrations. Acute hepatitis models (Carbon tetrachloride and Concanavalin A) were performed in mice receiving or not receiving, different extract doses by gavage. Liver injury was assessed using histology, transaminases and pro-inflammatory markers. Extract antioxidant and radical scavenging capacities were evaluated.ResultsThe extract led to a significant decrease in pro-inflammatory cytokine expression in vitro and to a remarkable protection of mice from carbon tetrachloride-induced liver injury, as shown by a significant decrease in dose-dependent transaminases level. Upon extract treatment, inflammatory markers were significantly decreased and liver injuries were limited as well. In the Concanavalin A model, the extract displayed weak effects.ConclusionsTaking into account underlying mechanisms in both hepatitis models, we demonstrate the extract’s radical scavenging capacity. Neoboutonia velutina displays a potent hepatoprotective effect mediated through radical scavenging properties
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