Analgesic and Antioxidant Activity of Mangiferin and Its Derivatives: the Structure Activity Relationship
作者:Ahsana Dar、Shaheen Faizi、Sabira Naqvi、Talat Roome、Sadia Zikr-ur-Rehman、Muhammad Ali、Sadiqa Firdous、Syed Tarique Moin
DOI:10.1248/bpb.28.596
日期:——
Mangiferin, 2-β-D-glucopyranosyl-1,3,6,7-tetrahydroxy-9H-xanthen-9-one, obtained directly from methanolic extracts of Bombax ceiba leaves in substantial amounts demonstrated strong antioxidant activity (EC50 5.8±0.96 μg/ml or 13.74 μM) using DPPH assay comparable to rutin, commonly used as antioxidant for medical purposes. The acetyl and cinnamoyl derivatives were found to be less active than mangiferin whereas, methyl and 3,6,7-trimethylether tetraacetate derivatives were inactive implying that for antioxidant activity, free hydroxyl groups and catechol moiety are essential. Moreover, mangiferin showed hepatoprotective activity against carbon tetrachloride induced liver injury further supporting the free radical scavenging property in the in vivo system. Additionally, plant extracts and mangiferin failed to exhibit acute anti-inflammatory activity whereas, it displayed significant analgesic effect in acetic acid-induced writhing and hot plate tests in mice. Using naloxone, it was revealed that plant extracts induced analgesia was independent of opioid receptor, whereas, mangiferin demonstrated significant interaction with it at peripheral site with a slight contribution at the neuronal level.
芒果苷,2-β-<小>D小>-吡喃葡萄糖基-1,3,6,7-四羟基-9H-xanthen-9-one,直接从木棉叶的甲醇提取物中提取,大量显示出强大的抗氧化作用使用 DPPH 测定得出的活性(EC50 5.8±0.96 μg/ml 或 13.74 μM)与芦丁相当,芦丁通常用作医疗用途的抗氧化剂。发现乙酰基和肉桂酰基衍生物的活性低于芒果苷,而甲基和 3,6,7-三甲醚四乙酸酯衍生物则无活性,这意味着对于抗氧化活性,游离羟基和儿茶酚部分是必不可少的。此外,芒果苷对四氯化碳引起的肝损伤具有保肝活性,进一步支持了体内系统的自由基清除特性。此外,植物提取物和芒果苷未能表现出急性抗炎活性,但在乙酸诱导的小鼠扭体和热板试验中表现出显着的镇痛作用。使用纳洛酮,发现植物提取物诱导的镇痛独立于阿片受体,而芒果苷在外周部位表现出显着的相互作用,在神经元水平上有轻微的贡献。