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Polyphenols isolated from Acacia mearnsii bark with anti-inflammatory and carbolytic enzyme inhibitory activities / 中国天然药物
Chinese Journal of Natural Medicines (English Ed.) ; (6): 816-824, 2017.
Article in English | WPRIM | ID: wpr-812053
ABSTRACT
The present study was designed to characterize the polyphenols isolated from Acacia mearnsii bark crude extract (B) and fractions (B1-B7) obtained by high-speed counter-current chromatography (HSCCC) and evaluate their anti-inflammatory and carbolytic enzymes (α-glucosidase and α-amylase) inhibitory activities. Fractions B4, B5, B6, B7 (total phenolics 850.3, 983.0, 843.9, and 572.5 mg·g, respectively; proanthocyanidins 75.7, 90.5, 95.0, and 44.8 mg·g, respectively) showed significant activities against reactive oxygen species (ROS), nitric oxide (NO) production, and expression of pro-inflammatory genes interleukin-1β (IL-1β) and inducible nitric oxide synthase (iNOS) in a lipopolysaccharide (LPS)-stimulated mouse macrophage cell line RAW 264.7. All the extracts suppressed α-glucosidase and α-amylase activities, two primary enzymes responsible for carbohydrate digestion. A. mearnsii bark samples possessed significantly stronger inhibitory effects against α-glucosidase enzyme (IC of 0.4-1.4 μg·mL) than the pharmaceutical acarbose (IC 141.8 μg·mL). B6 and B7 (IC 17.6 and 11.7 μg·mL, respectively) exhibited α-amylase inhibitory activity as efficacious as acarbose (IC 15.4 μg·mL). Moreover, B extract, at 25 µg·mL, significantly decreased the non-mitochondrial oxidative burst that is often associated with inflammatory response in human monocytic macrophages.
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Full text: Available Index: WPRIM (Western Pacific) Main subject: Pharmacology / Plant Extracts / Chemistry / Lipopolysaccharides / Plant Bark / Proanthocyanidins / Acacia / Nitric Oxide Synthase Type II / Alpha-Amylases / Carbohydrate Metabolism Limits: Animals Language: English Journal: Chinese Journal of Natural Medicines (English Ed.) Year: 2017 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Pharmacology / Plant Extracts / Chemistry / Lipopolysaccharides / Plant Bark / Proanthocyanidins / Acacia / Nitric Oxide Synthase Type II / Alpha-Amylases / Carbohydrate Metabolism Limits: Animals Language: English Journal: Chinese Journal of Natural Medicines (English Ed.) Year: 2017 Type: Article