Autophagy induced by farnesyltransferase inhibitors in cancer cells

Autophagy induced by farnesyltransferase inhibitors in cancer cells
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法尼基转移酶抑制剂诱导癌细胞自噬

DOI:
10.4161/cbt.7.10.6661
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发表时间:
2008-10
期刊:
Cancer Biol Ther
影响因子:
--
通讯作者:
S. C. Yeung
S. C. Yeung
中科院分区:
其他
文献类型:
--
作者:
C. H. Su;L. Sun;R. Zhao;J. Pan;B. Chen;Z. X. Xu;M. H. Lee;S. C. Yeung

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法尼基转移酶抑制剂(FTIs)的作用机制涉及Rheb和磷脂酰肌苷3-激酶/Akt/哺乳动物雷帕霉素靶蛋白(mTOR)途径。尤其是mTOR在自噬的调控中起着关键作用。总的来说,文献表明fti很可能诱导自噬,但迄今为止还没有关于fti影响与癌细胞生物学相关的自噬过程的报道。我们假设fti可以诱导自噬。在这项研究中,我们发现FTIs马霉素A、FTI-276和lonafarnib诱导了两种人类癌细胞系的自噬。我们还发现,用泛caspase抑制剂抑制细胞凋亡和抑制自噬都不能增加lonafarnib处理的U2OS骨肉瘤细胞在软琼脂中形成的克隆数量。尽管自噬是FTI治疗后的细胞死亡还是细胞存活机制尚不清楚,但我们的数据表明,癌细胞在FTI治疗后一旦死亡,显然可以在凋亡和自噬之间转换。
The mechanisms of action of farnesyltransferase inhibitors (FTIs) involve Rheb and the phosphatidylinositide 3-kinase/Akt/mammalian target of rapamycin (mTOR) pathway. mTOR in particular plays a key role in the regulation of autophagy. Collectively, the literature suggests that FTIs very likely induce autophagy, but thus far there have been no reports that FTIs affect this process relevant to cancer cell biology. We hypothesized that FTIs can induce autophagy. In this study, we found that the FTIs manumycin A, FTI-276, and lonafarnib induced autophagy in two human cancer cell lines. We also found that neither inhibition of apoptosis with a pan-caspase inhibitor nor inhibition of autophagy increased the number of clones of lonafarnib-treated U2OS osteosarcoma cells that formed in soft agar. Although whether autophagy is a cell death or cell survival mechanism after FTI treatment remains unresolved, our data show that cancer cells apparently can shift between apoptosis and autophagy once they are committed to die after FTI treatment.
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