红螯光壳螯虾细胞自噬过程中自噬体与微管相互作用
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天津市自然科学基金(17JCYBJC29700);国家自然科学基金(31472299)


Study on interaction of autophagosome and microtubule during autophagy process in Cherax quadricarinatus
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    摘要:

    昆虫方面研究提示自噬在病毒侵染增殖中发挥了重要作用,而虾类自噬研究报道极少,了解虾类细胞自噬将为虾病害免疫研究开辟新的思路。自噬相关蛋白LC3是自噬过程的标志性蛋白,存在于自噬体膜上,前期生物信息学分析发现,红螯光壳螯虾自噬相关蛋白LC3(CqLC3)和微管蛋白α-tubulin (Cqα-tubulin)具有互作关系。为深入揭示红螯光壳螯虾细胞自噬体的运输途径,本实验通过体外重组构建了蛋白表达载体pET-HIS-CqLC3和pET-GST-Cqα-tubulin,并诱导表达,利用亲和层析法分别纯化获得HIS和GST融合表达蛋白HIS-CqLC3和GST-Cqα-tubulin,利用GST pull-down实验验证发现,CqLC3与Cqα-tubulin存在相互作用。微管抑制剂长春新碱解聚微管后,利用MDC染色法检测自噬体发现,红螯光壳螯虾细胞微管解聚破坏后自噬体积累增多,细胞不能正常完成自噬反应,因此可知,红螯光壳螯虾细胞自噬体可通过CqLC3与微管相互作用,微管在红螯光壳螯虾细胞自噬过程中对自噬体的运输具有重要作用。本文首次揭示了虾类细胞自噬反应中自噬体的运输途径,研究结果为虾类细胞自噬的研究奠定了基础。

    Abstract:

    Insect research suggests that autophagy plays an important role in virus infection and proliferation, while shrimp autophagy research reports are rare. Understanding the autophagy of shrimp cells will open up new ideas for shrimp disease immunity research. Autophagy related protein LC3 is a marker protein of autophagy, existing in the membrane of autophagosome during the whole autophagy process. Our bioinformatics analysis found that Cherax quadricarinatus LC3 (CqLC3) and α-tubulin (Cqα-tubulin) had the interaction relations. To further reveal transport way of autophagosome during autophagy process, in this study, recombinant plasmids pET-HIS-CqLC3 and pET-GST-Cqα-tubulin were constructed and induced for protein expression in vitro. Then HIS and GST tagged fusion proteins HIS-CqLC3 and GST-Cqα-tubulin were purified by using affinity chromatography respectively. Recombinant proteins HIS-CqLC3 and GST-Cqα-tubulin were found binding each other by the GST pull-down assay. In order to further reveal the role of microtubules for autophagosome transport, C. quadricarinatus cell microtubules were depolymerized by vincristine which was a microtubule inhibitor, then the autophagosomes were detected by MDC staining. The results showed that autophagic reaction was incomplete, and autophagosomes increased after microtubule depolymerization. Therefore, the autophagosomes in C. quadricarinatus cells can interact with microtubules through CqLC3, and microtubules play an important role in autophagosome transport during autophagy process. This paper for the first time revealed the transport pathway of autophagosomes in shrimp autophagy, and the results laid the foundation for the study of autophagy in shrimp cells.

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孟凡娟,张广成,尹文娟,王丽燕,孙金生.红螯光壳螯虾细胞自噬过程中自噬体与微管相互作用[J].水产学报,2019,43(12):2494~2500

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  • 收稿日期:2018-08-13
  • 最后修改日期:2019-01-04
  • 录用日期:2019-01-20
  • 在线发布日期: 2019-12-20
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