Reduced O-GlcNAcylation of SNAP-23 promotes cisplatin resistance by inducing exosome secretion in ovarian cancer.

Reduced O-GlcNAcylation of SNAP-23 promotes cisplatin resistance by inducing exosome secretion in ovarian cancer.
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SNAP-23的O-Glcnacylation降低通过诱导外泌体分泌卵巢癌促进了顺铂的耐药性。

DOI:
10.1038/s41420-021-00489-x
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发表时间:
2021-05-18
影响因子:
7
通讯作者:
Chen B
Chen B
中科院分区:
医学2区
文献类型:
--
作者:
Qian L;Yang X;Li S;Zhao H;Gao Y;Zhao S;Lv X;Zhang X;Li L;Zhai L;Zhou F;Chen B

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外泌体与各种癌症的化疗耐药性有关,但在卵巢癌中的作用尚不清楚。在这里,使用体外基于细胞和体内小鼠模型实验,我们表明,下调O-GlcNAc化,一个关键的翻译后蛋白质修饰,促进外泌体分泌。这增加了外泌体介导的顺铂从癌细胞的流出,导致化学抗性。从机制上讲,我们的数据表明,下调O-GlcNA化转移酶(OGT)减少了SNAP-23的O-GlcNA化。值得注意的是,SNAP-23的O-GlcNAc酰化对于调节卵巢癌细胞中的外泌体释放至关重要。SNAP-23的减少的O-GlcNA化随后促进由SNAP-23、VAMP 8和Stx 4蛋白组成的可溶性N-乙基马来酰亚胺敏感因子附着蛋白受体(SNARE)复合物的形成。这增强了外泌体释放,通过增加细胞内顺铂的流出而引起化学抗性。
Exosomes have been associated with chemoresistance in various cancers, but such a role in ovarian cancer is not yet clear. Here, using in vitro cell-based and in vivo mouse model experiments, we show that downregulation of O-GlcNAcylation, a key post-translational protein modification, promotes exosome secretion. This increases exosome-mediated efflux of cisplatin from cancer cells resulting in chemoresistance. Mechanistically, our data indicate that downregulation of O-GlcNAclation transferase (OGT) reduces O-GlcNAclation of SNAP-23. Notably, O-GlcNAcylation of SNAP-23 is vital for regulating exosome release in ovarian cancer cells. Reduced O-GlcNAclation of SNAP-23 subsequently promotes the formation of soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) complex consisting of SNAP-23, VAMP8, and Stx4 proteins. This enhances exosome release causing chemoresistance by increasing the efflux of intracellular cisplatin.
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