Abstract
The continuous emergence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants poses challenges to the effectiveness of neutralizing antibodies. Rational design of antibody cocktails is a realizable approach addressing viral immune evasion. However, evaluating the breadth of antibody cocktails is essential for understanding the development potential. Here, based on a replication competent vesicular stomatitis virus model that incorporates the spike of SARS-CoV-2 (VSV-SARS-CoV-2), we evaluated the breadth of a number of antibody cocktails consisting of monoclonal antibodies and bispecific antibodies by long-term passaging the virus in the presence of the cocktails. Results from over two-month passaging of the virus showed that 9E12 + 10D4 + 2G1 and 7B9-9D11 + 2G1 from these cocktails were highly resistant to random mutation, and there was no breakthrough after 30 rounds of passaging. As a control, antibody REGN10933 was broken through in the third passage. Next generation sequencing was performed and several critical mutations related to viral evasion were identified. These mutations caused a decrease in neutralization efficiency, but the reduced replication rate and ACE2 susceptibility of the mutant virus suggested that they might not have the potential to become epidemic strains. The 9E12 + 10D4 + 2G1 and 7B9-9D11 + 2G1 cocktails that picked from the VSV-SARS-CoV-2 system efficiently neutralized all current variants of concern and variants of interest including the most recent variants Delta and Omicron, as well as SARS-CoV-1. Our results highlight the feasibility of using the VSV-SARS-CoV-2 system to develop SARS-CoV-2 antibody cocktails and provide a reference for the clinical selection of therapeutic strategies to address the mutational escape of SARS-CoV-2.
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Acknowledgements
We would like to acknowledge following organizations and individuals for their assistances in the preparation of the manuscript: Professor Tao Sun of SJTU for providing technical and material supports in generating the VSV-SARS-CoV-2 system. This work was funded by the National Natural Science Foundation of China (81773621, 82073751 to JWZ); the National Science and Technology Major Project “Key New Drug Creation and Manufacturing Program” of China (No.2019ZX09732001-019 to JWZ); the Key R&D Supporting Program (Special support for developing medicine for infectious diseases) from the Administration of Chinese and Singapore Tianjin Eco-city to Jecho Biopharmaceuticals Ltd. Co.; Zhejiang University special COVID-19 grant 2020XGZX099 and Shanghai Jiao Tong University “Crossing Medical and Engineering” grant 20×190020003 to JWZ.
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LH, YQX and JWZ conceived the study and designed the experiments. HM, HFZ, JJL, YLY, YK, YJL, HNT and LW conducted the experiments. HM and JWZ wrote and revised the manuscript. SSW, YSY, MYW, YLB, BHZ, HYY, HJ and TS provided technical assistance. TS All authors read and approved the final manuscript.
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Ma, H., Zong, Hf., Liu, Jj. et al. Long-term passaging of pseudo-typed SARS-CoV-2 reveals the breadth of monoclonal and bispecific antibody cocktails. Acta Pharmacol Sin 44, 1455–1463 (2023). https://doi.org/10.1038/s41401-022-01043-w
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DOI: https://doi.org/10.1038/s41401-022-01043-w


