C16- Caractères microscopiques, physico-chimiques et phytochimiques des poudres de quatre Méliacées à propriété anti-inflammatoire

Introduction : Les meliaceae sont des espèces végétales utilisées dans le traitement des douleurs d'origine inflammatoire. Cependant les insuffisances de données pour la standardisation et le contrôle qualité de leur matière première limitent le développement de phytomédicaments sûrs et efficaces. Notre étude recherche des caractères de standardisation microscopique, physico-chimiques et phytochimiques des poudres de feuilles et d’écorces de Ekebergia senegalensis, Khaya senegalensis, Pseudocedrela kotschyi et Trichilia emetica. Méthodologie : Après la description macroscopique des organes, nous avons mesuré l’intensité des couleurs, réalisé une observation microscopique puis déterminé les paramètres de pureté et d'identité des poudres. Résultats : Les poudres de feuilles et des écorces présentent des teneurs en humidité inférieures à 5%. La comparaison de la coloration des écorces indique une plus forte intensité pour Khaya senegalensis comparée à Pseudocedrela kotschyi. La microscopie a révélé des fibres, des trichomes et des cristaux d’oxalates de calcium. Les cendres totales sont inférieures à 10% excepté pour les écorces de Pseudocedrela kotschyi (20,09%). Les plus grandes teneurs en calcium sont retrouvées dans les poudres de Pseudocedrela kotschyi suivi de Khaya senegalensis ainsi que les plus grandes teneurs en phénoliques totaux et en terpenoïdes totaux. Les composés phénoliques, analogues structuraux des anti- inflammatoires non stéroïdien, et les composés terpéniques, analogues aux stéroïdees, retrouvés dans ses drogues, agissent sur différentes composantes de l'inflammation et constituent le support de l'activité anti-inflammatoire reconnue des méliacées. Conclusion : Nos résultats présentés sont des données factuelles qui permettront le contrôle qualité et la standardisation des poudres de ces meliaceae d’intérêt thérapeutique

Antioxidant and anticancer activities of polyphenolic compounds from three Acanthaceae medicinal species from Burkina Faso

Phytochemical screening and biological activities of methanol extracts from three Acanthaceae species namely Hygrophila auriculata (H. auriculata), Nelsonia canescens (N. canescens) and Peristrophe bicalyculata (P. bicalyculata), widely used in local ethnomedicine, were carried out. Phenolic content quantification indicated that H. auriculata extract possessed the highest polyphenolics content followed by N. canescens and P. bicalyculata. Biological activities assessment showed that H. auriculata extract has the best antioxidant (through DPPH, FRAP and ABTS methods) capacity. Acetylcholinesterase and Lipoxygenase inhibition tests revealed interesting activities from P. bicalyculata. Testing cancer cells antiproliferation, it was showed that H. auriculata and N. canescens) were of good interest (27.00±1.55 and 29.70±3.11 µg/mL).These results showed that the phenolic compounds of these plants could justify their local traditional use to treat inflammatory and tumoral diseases

Antioxidant and anticancer activities of polyphenolic compounds from three Acanthaceae medicinal species from Burkina Faso

Phytochemical screening and biological activities of methanol extracts from three Acanthaceae species namely Hygrophila auriculata (H auriculata), Nelsonia canescens (N canescenŝ) and Peristrophe bicalyculata (P. bicalyculata), widely used in local ethnomedicine, were carried out. Phenolic content quantification indicated that H auriculata extract possessed the highest polyphenolics content followed by N canescens and P. bicalyculata. Biological activities assessment showed that H. auriculata extract has the best antioxidant (through DPPH, FRAP and ABTS methods) capacity. Acetylcholinesterase and Lipoxygenase inhibition tests revealed interesting activities from P bicalyculata. Testing cancer cells antiproliferation, it was showed that H auriculata and N canescens) wereof good interest (27.00±1.55 and 29.70±3.11 μg/mL). These results showed that the phenolic compounds of these plants could justify their local traditional use to treat inflammatory and tumoral diseases.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

The Major Stilbene Compound Accumulated in the Roots of a Resistant Variety of Phoenix dactylifera L. Activates Proteasome for a Path in Anti-Aging Strategy

The main objective of the present study is to estimate, through differential analysis, various biological activities of total phenolics content in alcoholic extracts of three date palm varieties sensitive or resistant to Fusarium oxysporum. sp Albidinis. Here, stilbene products with antioxidant and bioactive capacities were evidenced in resistant variety Taabdount (TAAR). Furthermore, the methanolic fraction of the TAAR-resistant date palm variety contains a significant product, determined by LC-MS/MS and 1H, 13C NMR, belonging to the family of hydroxystilbenes, which exhibits antioxidant capacities, inhibits the mushroom tyrosinase activity, and activates and exerts a protective effect on hypochlorite-induced damage in 20S proteasome of human dermal fibroblast aged cells. Altogether, the present results indicate that hydroxystilbene present in resistant Phoenix dactylifera L. should be studied to understand the way that the stilbene could exert anti-aging ability

Potent antiproliferative cembrenoids accumulate in tobacco upon infection with Rhodococcus fascians and trigger unusual microtubule dynamics in human glioblastoma cells.

Though plant metabolic changes are known to occur during interactions with bacteria, these were rarely challenged for pharmacologically active compounds suitable for further drug development. Here, the occurrence of specific chemicals with antiproliferative activity against human cancer cell lines was evidenced in hyperplasia (leafy galls) induced when plants interact with particular phytopathogens, such as the Actinomycete Rhodococcus fascians.Journal ArticleResearch Support, Non-U.S. Gov'tSCOPUS: ar.jinfo:eu-repo/semantics/publishe

Cytological analysis of control (Ct) and F3.1.1-treated U373 cells.

<p>All treatments with fraction F3.1.1 were done at 4 µg/mL for 72 h. (A) F-actin filament immunostaining with phalloidin conjugated to Alexa Fluor 488 (red) and visualization of nuclei with DAPI staining (blue). Arrows indicate irregularly shaped nuclei. (B) Flow cytometry analysis of the cell size distribution of the entire cell population as measured by electronic volume (EV). (C) Cytoskeleton immunostaining for F-actin (red) and with anti-α/β-tubulin antibodies for the microtubule arrangement (green). The scale is the same in all panels (bar  = 20 µm).</p

GC-MS analysis of fraction F3.1.1.

<p>(A) GC chromatogram of fraction F3.1.1. (B) Mass spectrum of the peak eluted at 68.43 min.</p

Crude chloroformic extract and sub-fraction F3.1.1. of <i>N. tabacum</i> (leafy galls (LG) and non-infected plants (NIP)) with antiproliferative activity against the glioblastoma U373 cell growth.

<p>Cells were treated for 72± SEM (n = 6).</p

Analysis of cell division-related processes in control (Ct), F3.1.1-, and cembrene-treated U373 cells.

<p>Cells were treated with 4 µg/mL of F3.1.1 or cembrene. (A, B) <i>In vitro</i> cell global growth after 24 and 48 h of culture of (A) cembrene- and (B) F3.1.1-treated cells. (C, D) Cell division duration over a time period of 48 h of growth in (C) cembrene- and (D) F.3.1.1- treated cells. The data are represented as the mean ± SD (n = 3).</p