紫柳珊瑚中抗肿瘤活性成分LC1诱导A549细胞凋亡机制研究

来源 :全国第二届海洋与陆地多糖多肽及天然创新药物研发学术会议 | 被引量 : 0次 | 上传用户:yulong19841001
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南海海洋柳珊瑚中含有多种独特结构及生理活性的天然活性成分,其中甾体类是柳珊瑚中提取分离代谢产物的代表,对多种肿瘤细胞株具有生长抑制作用.对南海紫柳珊瑚中单体成分进行抗肿瘤活性筛选,寻找到抑制肿瘤细胞生长、诱导肿瘤细胞凋亡效果好的成分;并对其中的LC1诱导A549肺癌细胞株凋亡的具体机制进行探讨,研究其抗肿瘤信号途径和作用靶点,为临床开发抗肿瘤新药提供一定的实验理论依据.紫柳珊瑚提取物LC1诱导A549肿瘤细胞的凋亡是伴随着细胞形态学改变,细胞核固缩,DNA断裂,磷脂酰丝氨酸暴露:并能诱导线粒体膜通透性改变导致线粒体膜电位(MMP)的急剧下降。LC1可激活A549细胞内C-Jun N-末端激酶(JNK)途径,JNK被激活后通过进一步磷酸化激活转录因子AP-1蛋白(c-Jun),说明LC1可能通过转录依赖的方式介导A549细胞线粒体途径的细胞凋亡。此外,细胞凋亡的最后阶段通过非Caspases依赖的线粒体途径,可能是由于凋亡诱导因子(AIF)的核转位引起。
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