Inhibition of SF3b1 by pladienolide B evokes cycle arrest, apoptosis induction and p73 splicing in human cervical carcinoma cells

Inhibition of SF3b1 by pladienolide B evokes cycle arrest, apoptosis induction and p73 splicing in human cervical carcinoma cells
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pladienolide B 抑制 SF3b1 可引起人宫颈癌细胞周期停滞、细胞凋亡诱导和 p73 剪接

DOI:
10.1080/21691401.2019.1596922
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发表时间:
2019-04
影响因子:
5.8
通讯作者:
Zhang Hong
Zhang Hong
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhang Qianjing;Di Cuixia;Yan Junfang;Wang Fang;Qu Tao;Wang Yupei;Chen Yuhong;Zhang Xuetian;Liu Yang;Yang Hongying;Zhang Hong

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Pladienolide B是一种有效的癌细胞生长抑制剂,靶向剪接体的SF3b1亚基。人们对该化合物作为研究SF3b1在癌症中的功能的工具非常感兴趣。然而,SF3b1诱导癌细胞凋亡的分子机制目前知之甚少。本研究探讨SF3b1诱导人宫颈癌细胞凋亡的分子机制。我们证明了铂烯内酯B对SF3b1的抑制作用在低纳摩尔浓度下以剂量和时间依赖的方式抑制HeLa细胞的增殖。诱导G2/M期阻滞,凋亡细胞明显增多。此外,铂烯内酯B抑制SF3b1可诱导Tap73/ΔNp73表达,从而下调Bax/Bcl-2比值、细胞色素c释放和caspase-3表达。因此,我们的研究结果表明SF3b1在人宫颈癌细胞的周期阻滞、细胞凋亡诱导和p73剪接中起关键作用,表明SF3b1可以作为宫颈癌治疗的潜在候选者。
Abstract Pladienolide B is a potent cancer cell growth inhibitor that targets the SF3b1 subunit of the spliceosome. There is considerable interest in the compound as a tool to study SF3b1 function in cancer. However, so far little information is available on the molecular mechanism of SF3b1 eliciting apoptosis in cancer cells. Here, we investigated the molecular mechanism of SF3b1 eliciting apoptosis in human cervical carcinoma cells. We demonstrated that inhibition of SF3b1 by pladienolide B inhibited proliferation of HeLa cells at low nanomolar concentrations in a dose- and time-dependent manner. It also induced G2/M phase arrest and significant rise of apoptotic cells. Moreover, it is indicated that inhibition of SF3b1 by pladienolide B induced Tap73/ΔNp73 expression and consequently down-regulated Bax/Bcl-2 ratio, cytochrome c release and caspase-3 expression. Thus, our results showed that SF3b1 plays a pivotal role in cycle arrest, apoptosis induction, and p73 splicing in human cervical carcinoma cells, suggesting that SF3b1 could be used as a potential candidate for cervical cancer therapy.
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