土贝母苷甲诱导的人宫颈癌HeLa细胞凋亡的超微结构变化及环孢菌素A的保护作用

目的 观察土贝母苷甲(TBMS1)诱导的人宫颈癌HeLa细胞凋亡的超微结构变化及环孢菌素A的保护效果,探讨以线粒体为中心的内源性凋亡途径在TBMS1诱导人宫颈癌HeLa细胞凋亡时的作用.方法 利用透射电镜观察不同浓度TBMS1作用不同时间引起的细胞超微结构的变化,以及环孢菌素A预处理对TBMS1作用的影响.结果 随着土贝母TBMS1浓度的增高和作用时间的延长,人HeLa细胞的结构发生了连续性变化.肿瘤细胞逐渐减小,细胞间隙逐渐增大,线粒体逐渐肿胀、退化,粗面内质网逐渐扩张,核逐渐变小、核碎裂.在TBMS1低浓度时,环孢菌素A能够在一定程度上保护细胞免受TBMS1的损伤.环孢菌素A对TBMS1的损伤有保护效果.但当TBMS1浓度增大时,环孢菌素A的这种保护就不起作用了.结论 TBMS1诱导HeLa细胞发生一系列凋亡特征的超微结构变化,线粒体肿胀、退化为其特征之一,从形态学角度提供了以线粒体为中心的内源性凋亡途径起一定作用.

Tubeimoside I-induced ultrastructural changes of human cervical carcinoma HeLa cell line and the protective effect of cyclosporine A

OBJECTIVE: To observe the ultrastructural changes of HeLa cells in response to tubeimoside I (TBMS1) treatment and the protective effect of cyclosporine A (CsA), and explore the role of intrinsic apoptosis pathway in TBMS1-induced HeLa cell apoptosis. METHODS: HeLa cells were treated with TBMS1 (10-50 micromo/L) alone or in combination with 2 micromol/L CsA for 12 and 24 h and observed with transmission electron microscope (TEM) for the ultrastructural changes of the cells. RESULTS: TBMS1 induced apoptosis of HeLa cells in a concentration- and time-dependant manner. Under TEM, the treated cells progressively shrunk and the intercellular space widened with loss of microvillus, mitochondrial swelling, rough endoplasmic reticulum enlargement, chromatin condensation, nuclear shrinkage and nuclear pyknosis as TBMS1 concentration increased. At low concentrations, CsA offered partial protection of the mitochondria from TBMS1-induced damage whereas high-concentration CsA did not. CONCLUSION: TBMS1 induces ultrastructural changes typical for apoptosis of the HeLa cells, which provides morphological evidence for the role of intrinsic apoptosis pathway in TBMS1-induced apoptosis.