Meriem RAHMANI BERBOUCHA, Grégory DA COSTA, Nadjet DEBBACHE-BENAIDA, Karima AYOUNI, Tristan RICHARD, Nadjia AHMANE, Nassima CHAHER, Dina ATMANI-KILANI, Djebbar ATMANI

Identification of bioactive compounds from Fraxinus angustifolia extracts with antiNADH oxidase activity of bovine milk xanthine oxidoreductase

Fraxinus angustifolia leaves and bark are used in traditional medicine against various inflammatory-related pathologiesincumbent to reactive oxygen species (ROS) generation by the NADH oxidase activity of enzymes such as xanthine oxidoreductase(XOR). This study was designed to investigate the in vitro and in vivo inhibitory activities of this enzyme by Fraxinus angustifoliaextracts. The leaf organic phase of ethyl acetate (LFA) and its bark aqueous counterpart (BFA) showed the strongest anti-NADH oxidaseactivity in vitro (IC50 = 38.51 and 42.04 µg mL-1, respectively). They consequently suppressed superoxide generation both enzymatically(53% and 19%, respectively) and nonenzymatically (34% and 19%, respectively). These results were corroborated in vivo, with high antiNADH oxidase potential of the leaves and bark extracts (75.32% and 51.32%, respectively) concomitant with moderate hypouricemicactivities (36.84% and 38.59%, respectively). Bio-guided fractionation led to the identification, by LC-DAD-MS/MS, of esculin andcalcelarioside in bark and kaempferol glucoside in leaves as the main compounds responsible for the anti-NADH oxidase activity ofXOR. These results plead in favor of the use of F. angustifolia as a source of potentially interesting therapeutic substances.

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