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菌物学报  2015 

椭圆嗜蓝孢孔菌中四种甾类化合物的抗肿瘤活性及构效关系分析

DOI: DOI:10.13346/j.mycosystema.140032, PP. 293-300

Keywords: 椭圆嗜蓝孢孔菌,甾类化合物,抗肿瘤活性,构效关系

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Abstract:

采用硅胶色谱法、重结晶法从椭圆嗜蓝孢孔菌Fomitiporiaellipsoidea子实体的石油醚提取物中分离得到4个甾类化合物,单体化合物通过与已知标准品比对确定化合物结构,分别为麦角甾醇(麦角甾-5,7,22-三烯-3β-醇)、麦角甾醇过氧化物(5α,8α-过氧麦角甾-6,22-二烯-3β-醇)、麦角甾-7,22-二烯-3β-醇-棕榈酸酯和麦角甾-4,6,8(14),22(23)-四烯-3-酮。采用MTT法检测甾类化合物对人肿瘤细胞的抑制活性。采用H22裸鼠移植模型法评价甾类化合物的体内抗肿瘤活性。结果表明:在细胞毒实验中,麦角甾醇和麦角甾醇过氧化物对人肝癌细胞株HepG2、人乳腺癌细胞株MCF-7、人宫颈癌细胞株Hela和人肺癌细胞株A549均有较好的抑制活性,麦角甾醇效果最佳,在浓度为50mg/mL时抑制率分别达到82.89%、74.33%、50.03%和69.33%,IC50值分别为20.61mg/mL、37.18mg/mL、49.89mg/mL和38.74mg/mL,对HepG2的抑制能力优于其他细胞系。在体内实验中,麦角甾醇和麦角甾-4,6,8(14),22(23)-四烯-3-酮在剂量为50mg/kg/d时抑瘤率分别为60.75%和63.21%,并且麦角甾醇组瘤鼠的脾指数有显著增加。构效关系分析认为甾核的C-3位被羟基或羰基取代后,化合物的抗肿瘤活性较显著。

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