The cytotoxicity of coxsackievirus B3 is associated with a blockage of autophagic flux mediated by reduced syntaxin 17 expression.

The cytotoxicity of coxsackievirus B3 is associated with a blockage of autophagic flux mediated by reduced syntaxin 17 expression.
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柯萨奇病毒 B3 的细胞毒性与突触蛋白 17 表达减少介导的自噬流阻断有关

DOI:
10.1038/s41419-018-0271-0
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发表时间:
2018-02-14
影响因子:
9
通讯作者:
Yang Z
Yang Z
中科院分区:
生物学1区
文献类型:
--
作者:
Tian L;Yang Y;Li C;Chen J;Li Z;Li X;Li S;Wu F;Hu Z;Yang Z

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柯萨奇病毒B3(CVB3)是一种重要的人类病原体,与心律失常和急性心力衰竭有关。据报道,CVB3感染可以诱导自噬小体的形成,从而支持病毒在宿主细胞中的复制。有趣的是,我们的研究表明,CVB3感染过程中自噬小体的积累是由自噬小体-溶酶体融合受阻而不是自噬小体生物发生的诱导引起的。此外,CVB3还降低了合成素17(STX17)的转录和翻译,合成素17是一种参与自噬小体-溶酶体融合的SNARE(可溶性N-乙基马来酰亚胺敏感因子激活蛋白受体)蛋白。过表达STX17可恢复自噬通量,减轻病毒诱导的溶酶体功能障碍,减少CVB3感染诱导的HeLa细胞凋亡。综上所述,我们的结果提示,CVB3感染通过阻断自噬小体-溶酶体融合而损害自噬通量。因此,这些发现指出了针对STX17或自噬小体-溶酶体融合治疗CVB3相关疾病的潜在新治疗策略。
Coxsackievirus B3 (CVB3) is an important human pathogen linked to cardiac arrhythmias and acute heart failure. CVB3 infection has been reported to induce the formation of autophagosomes that support the viral replication in host cells. Interestingly, our study shows that the accumulation of autophagosomes during CVB3 infection is caused by a blockage of autophagosome–lysosome fusion rather than the induction of autophagosome biogenesis. Moreover, CVB3 decreases the transcription and translation of syntaxin 17 (STX17), a SNARE (soluble N-ethylmaleimide-sensitive factor activating protein receptor) protein involved in autophagosome–lysosome fusion. Overexpression of STX17 restored the autophagic flux, alleviated the virus-induced lysosomal dysfunction, and decreased the apoptosis induced by CVB3 infection in HeLa cells. Taken together, our results suggest that CVB3 infection impairs the autophagic flux by blocking autophagosome–lysosome fusion. These findings thus point to potential new therapeutic strategies targeting STX17 or autophagosome–lysosome fusion for treating CVB3-associated diseases.
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