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Inhibition of heat shock protein 90 suppresses Bombyx mori nucleopolyhedrovirus replication in B. mori.
Insect Molecular Biology ( IF 2.3 ) Pub Date : 2019-11-14 , DOI: 10.1111/imb.12625
Q Shang 1 , P Wu 1, 2, 3 , H L Huang 1 , S L Zhang 1 , X D Tang 1, 2 , X J Guo 1, 2
Affiliation  

Heat shock protein 90 (Hsp90) plays a very important role in facilitating the replication of many viruses. Until now, little has been known about the role of Hsp90 in Bombyx mori virus infection. In this study, we explored the role of BmHsp90 in B. mori nucleopolyhedrovirus (BmNPV) replication. We found that BmHsp90 inhibition by geldanamycin (GA) significantly reduced the BmNPV titre, the protein expression level of BmNPV nucleocapsid protein 39 (VP39) and the transcript level of BmNPV genes. Silencing the hsp90 gene in BmN cells by small interfering RNA suppressed BmNPV replication whereas overexpression of hsp90 promoted the replication of BmNPV. After inhibition of Hsp90, the expression of three key genes [signal transducing activator of transcription (stat), suppressor of cytokine signalling protein 2 (socs2), socs6] involved in the Janus kinase/STAT pathway significantly changed, with up‐regulation of stat and down‐regulation of socs2 and socs6. In addition, the expression of two antiapoptosis genes, BmNPV inhibitor of apoptosis protein1 (BmNPV‐iap1) and Bmiap2, was greatly decreased in GA‐treated cells, whereas their expression was significantly increased in hsp90‐overexpressed silkworm larvae. Our results indicated that inhibition of Hsp90 can suppress BmNPV proliferation in B. mori. Our findings may provide new clues to elucidate the molecular mechanisms of silkworm–virus interactions.

中文翻译:

抑制热激蛋白90可抑制家蚕中的家蚕核多角体病毒复制。

热休克蛋白90(Hsp90)在促进许多病毒的复制中起着非常重要的作用。迄今为止,人们对Hsp90在家蚕病毒感染中的作用了解甚少。在这项研究中,我们探讨了BmHsp90在桑蚕核仁多角体病毒(BmNPV)复制中的作用。我们发现格尔德霉素(GA)抑制BmHsp90显着降低了BmNPV滴度,BmNPV核衣壳蛋白39(VP39)的蛋白表达水平和BmNPV基因的转录水平。通过小的干扰RNA沉默BmN细胞中的hsp90基因可抑制BmNPV复制,而过表达hsp90促进了BmNPV的复制。抑制Hsp90后,参与Janus激酶/ STAT通路的三个关键基因[信号转导转录激活因子stat),细胞因子信号蛋白2的抑制因子socs2,socs6 ]的表达发生了显着变化,且stat上调以及下调socs2socs6。此外,GA处理的细胞中两个抗凋亡基因BmNPV凋亡抑制蛋白1(BmNPV- iap1)和Bmiap2的表达大大降低,而在hsp90中它们的表达显着增加过表达的蚕幼虫。我们的结果表明,抑制Hsp90可以抑制B.NPV在桑蚕中的增殖。我们的发现可能为阐明家蚕与病毒相互作用的分子机制提供新的线索。
更新日期:2019-11-14
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