Department of Microbiology and Immunology, University of Mississippi Medical Center, Jackson, MS, 39216, USA.
Department of Medicine, University of Mississippi Medical Center, Jackson, MS, 39216, USA.
Sci Rep. 2020 Nov 5;10(1):19076. doi: 10.1038/s41598-020-76135-w.
Pseuodotyped particles have significant importance and use in virology as tools for studying the biology of highly pathogenic viruses in a lower biosafety environment. The biological, chemical, and serological studies of the recently emerged SARS-CoV-2 will be greatly aided by the development and optimization of a suitable pseudotyping system. Here, we pseudotyped the SARS-CoV-2 Spike glycoprotein (SPG) on a traditional retroviral (MMLV) as well as a third generation lentiviral (pLV) vector and tested the transduction efficiency in several mammalian cell lines expressing SARS-CoV-2 receptor hACE2. While MMLV pseudotyped the vesicular stomatitis virus G glycoprotein (VSV-G) efficiently, it could not pseudotype the full-length SPG. In contrast, pLV pseudotyped both glycoproteins efficiently; however, much higher titers of pLV-G particles were produced. Among all the tested mammalian cells, 293Ts expressing hACE2 were most efficiently transduced using the pLV-S system. The pLV-S particles were efficiently neutralized by diluted serum (>:640) from recently recovered COVID-19 patients who showed high SARS-CoV-2 specific IgM and IgG levels. In summary, pLV-S pseudotyped virus provides a valid screening tool for the presence of anti SARS-CoV-2 specific neutralizing antibodies in convalescent patient serum.
伪型病毒颗粒在病毒学中具有重要意义和用途,可用作在较低生物安全环境中研究高致病性病毒生物学的工具。最近出现的 SARS-CoV-2 的生物学、化学和血清学研究将极大地受益于合适的伪型系统的开发和优化。在这里,我们将 SARS-CoV-2 的刺突糖蛋白(SPG)伪型化为传统逆转录病毒(MMLV)和第三代慢病毒(pLV)载体,并在表达 SARS-CoV-2 受体 hACE2 的几种哺乳动物细胞系中测试了转导效率。虽然 MMLV 能够有效地伪型化水疱性口炎病毒 G 糖蛋白(VSV-G),但它不能伪型化全长 SPG。相比之下,pLV 能够有效地伪型化这两种糖蛋白;然而,pLV-G 颗粒的产量要高得多。在所有测试的哺乳动物细胞中,表达 hACE2 的 293Ts 使用 pLV-S 系统被有效地转导。来自最近康复的 COVID-19 患者的稀释血清(>:640)能够有效地中和 pLV-S 颗粒,这些患者表现出高 SARS-CoV-2 特异性 IgM 和 IgG 水平。总之,pLV-S 伪型病毒为在恢复期患者血清中筛选针对 SARS-CoV-2 的特异性中和抗体提供了有效的工具。