SARS-CoV-2蛋白納米顆粒疫苗可激發有效的中和抗體反應
作者:
小柯機器人發布時間:2020/11/4 16:30:59
美國華盛頓大學Neil P. King、David Veesler等研究人員合作發現,SARS-CoV-2蛋白納米顆粒疫苗可激發有效的中和抗體反應。2020年10月30日,《細胞》雜誌在線發表了這項成果。
研究人員報導了基於結構的自組裝蛋白納米顆粒免疫原,其在小鼠中引發針對SARS-CoV-2的有效和保護性抗體反應。納米粒子疫苗在高度免疫原性的陣列中顯示了60個SARS-CoV-2刺突受體結合域(RBD);儘管劑量降低了五倍,但誘導的中和抗體滴度卻比融合前穩定的刺突高了十倍。RBD納米顆粒引發的抗體靶向了多個不同的表位,表明它們可能不容易逃脫突變,並且與恢復期的人血清相比具有較低的結合:中和率,這可以使與疫苗相關的增強呼吸道疾病的風險最小化。組裝後納米顆粒的高產率和穩定性表明,納米顆粒疫苗的生產將具有高度的可量產性。
這些結果凸顯了強大抗原展示平臺的實用性,並啟動了cGMP製造來將SARS-CoV-2-RBD納米顆粒疫苗推進臨床。
研究人員表示,目前需要一種安全、有效且可大量生產的疫苗來阻止SARS-CoV-2的大流行。
附:英文原文
Title: Elicitation of potent neutralizing antibody responses by designed protein nanoparticle vaccines for SARS-CoV-2
Author: Alexandra C. Walls, Brooke Fiala, Alexandra Schfer, Samuel Wrenn, Minh N. Pham, Michael Murphy, Longping V. Tse, Laila Shehata, Megan A. OConnor, Chengbo Chen, Mary Jane Navarro, Marcos C. Miranda, Deleah Pettie, Rashmi Ravichandran, John C. Kraft, Cassandra Ogohara, Anne Palser, Sara Chalk, E-Chiang Lee, Kathryn Guerriero, Elizabeth Kepl, Cameron M. Chow, Claire Sydeman, Edgar A. Hodge, Brieann Brown, Jim T. Fuller, Kenneth H. Dinnon, Lisa E. Gralinski, Sarah R. Leist, Kendra L. Gully, Thomas B. Lewis, Miklos Guttman, Helen Y. Chu, Kelly K. Lee, Deborah H. Fuller, Ralph S. Baric, Paul Kellam, Lauren Carter, Marion Pepper, Timothy P. Sheahan, David Veesler, Neil P. King
Issue&Volume: 2020-10-30
Abstract: A safe, effective, and scalable vaccine is needed to halt the ongoing SARS-CoV-2 pandemic. We describe the structure-based design of self-assembling protein nanoparticle immunogens that elicit potent and protective antibody responses against SARS-CoV-2 in mice. The nanoparticle vaccines display 60 SARS-CoV-2 spike receptor-binding domains (RBDs) in a highly immunogenic array and induce neutralizing antibody titers ten-fold higher than the prefusion-stabilized spike despite a five-fold lower dose. Antibodies elicited by the RBD-nanoparticles target multiple distinct epitopes, suggesting they may not be easily susceptible to escape mutations, and exhibit a lower binding:neutralizing ratio than convalescent human sera, which may minimize the risk of vaccine-associated enhanced respiratory disease. The high yield and stability of the assembled nanoparticles suggest that manufacture of the nanoparticle vaccines will be highly scalable. These results highlight the utility of robust antigen display platforms and have launched cGMP manufacturing efforts to advance the SARS-CoV-2-RBD nanoparticle vaccine into the clinic.
DOI: 10.1016/j.cell.2020.10.043
Source: https://www.cell.com/cell/fulltext/S0092-8674(20)31450-1
Cell:《細胞》,創刊於1974年。隸屬於細胞出版社,最新IF:36.216