Original articles
Zhihao Fu, Hongchuan Liu, Lan Wang, Chuanfei Yu, Yalan Yang, Meiqing Feng, Junzhi Wang. A reporter gene assay for determining the biological activity of therapeutic antibodies targeting TIGIT[J]. Acta Pharmaceutica Sinica B, 2021, 11(12): 3925-3934

A reporter gene assay for determining the biological activity of therapeutic antibodies targeting TIGIT
Zhihao Fua, Hongchuan Liub, Lan Wanga, Chuanfei Yua, Yalan Yanga, Meiqing Fengb, Junzhi Wanga
a. Key Laboratory of the Ministry of Health for Research on Quality and Standardization of Biotech Products, National Institutes for Food and Drug Control, Beijing 102629, China;
b. Department of Biological Medicines & Shanghai Engineering Research Center of Immunotherapeutics, School of Pharmacy, Fudan University, Shanghai 201203, China
T cell immunoglobulin and ITIM domain (TIGIT) is a novel immune checkpoint that has been considered as a target in cancer immunotherapy. Current available bioassays for measuring the biological activity of therapeutic antibodies targeting TIGIT are restricted to mechanistic investigations because donor primary T cells are highly variable. Here, we designed a reporter gene assay comprising two cell lines, namely, CHO-CD112-CD3 scFv, which stably expresses CD112 (PVRL2, nectin-2) and a membrane-bound anti-CD3 single-chain fragment variable (scFv) as the target cell, and Jurkat-NFAT-TIGIT, which stably expresses TIGIT as well as the nuclear factor of activated T-cells (NFAT) response element-controlled luciferase gene, as the effector cell. The anti-CD3 scFv situated on the target cells activates Jurkat-NFAT-TIGIT cells through binding and crosslinking CD3 molecules of the effector cell, whereas interactions between CD112 and TIGIT prevent activation. The presence of anti-TIGIT mAbs disrupts their interaction, which in turn reverses the inactivation and luciferase expression. Optimization and validation studies have demonstrated that this assay is superior in terms of specificity, accuracy, linearity, and precision. In summary, this reliable and effective reporter gene assay may potentially be utilized in lot release control, stability assays, screening, and development of novel TIGIT-targeted therapeutic antibodies.
Key words:    TIGIT    Therapeutic antibodies    Bioactivity determination    Reporter gene assay    Method validation   
Received: 2021-04-25     Revised: 2021-07-08
DOI: 10.1016/j.apsb.2021.09.011
Funds: This work was supported by the Major Scientific and Technological Special Project for “Significant New Drugs Development” (Grant No. 2018ZX09736016-007, China).
Corresponding author: Junzhi Wang,E-mail:wangjz_nifdc2014@163.com     Email:wangjz_nifdc2014@163.com
Author description:
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Zhihao Fu
Hongchuan Liu
Lan Wang
Chuanfei Yu
Yalan Yang
Meiqing Feng
Junzhi Wang

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