Extracellular vesicles originating from autophagy mediate an antibody-resistant spread of classical swine fever virus in cell culture


Posted: 2021-11-06 19:00:00
Free spread is a classical mode for mammalian virus transmission. However, the efficiency of this transmission approach is generally low as there are structural barriers or immunological surveillances in the extracellular environment under physiological conditions. In this study, we systematically analyzed the spreading of classical swine fever virus (CSFV) using multiple viral replication analysis in combination with antibody neutralization, transwell assay, and electron microscopy, and identified an extracellular vesicle (EV)-mediated spreading of CSFV in cell cultures. In this approach, intact CSFV virions are enclosed within EVs and transferred into uninfected cells with the movement of EVs, leading to an antibody-resistant infection of the virus. Using fractionation assays, immunostaining, and electron microscopy, we characterized the CSFV-containing EVs and demonstrated that the EVs originated from macroautophagy/autophagy. Taken together, our results showed a new spreading mechanism for CSFV and demonstrated that the EVs in CSFV spreading are closely related to autophagy. These findings shed light on the immune evasion mechanisms of CSFV transmission, as well as new functions of cellular vesicles in virus lifecycles.Abbreviations: 3-MA: 3-methyladenine; CCK-8: Cell Counting Kit-8; CSF: classical swine fever; CQ: chloroquine; CSFV: classical swine fever virus; DAPI, 4-,6-diamidino-2-phenylindole; EVs: extracellular vesicles; hpi: h post infection; IEM: immunoelectron microscopy; MAP1LC3B/LC3B: microtubule associated protein 1 light chain 3 beta; MOI: multiplicity of infection; MVs: microvesicles; ND50: half neutralizing dose; PCR: polymerase chain reaction; PBS: phosphate-buffered saline; SEC: size-exclusion chromatography; siRNA: small interfering RNA; TEM: transmission electron microscopy. Keywords: Classical swine fever virus (CSFV); LC3B; extracellular vesicles (EVs); size-exclusion chromatography (SEC); transmission electron microscopy (TEM).

参考サイト PubMed: exsome



バイオクイックニュース日本語版:エクソソーム特集

バイオクイックニュース日本語版
12月 17, 2019 バイオアソシエイツ

エクソソームが重度の前立腺癌促進伝達因子の送達をしていることが判明。 エクソソーム放出阻害が治療に有用であることが証明された。

ニューロン機能を支援する転写因子は、すでに再発した癌をさらに致命的にする可能性のある前立腺の細胞変換を可能にするようだ。 転写因子BRN4は主に中枢神経系と内耳で発現するが、稀であるが神経内分泌前立腺癌の患者でも増幅され過剰発現する最初の証拠がClinical Cancer Researchジャーナルで公開された。 この論文は「BRN4は去勢抵抗性前立腺癌における神経内分泌分化の新規ドライバーであり、BRN2を含む細胞外小胞で選択的に放出される(BRN4 Is a Novel Driver of…

ゲスト 908人 と メンバー 7人 がオンラインです