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2062 Bio-Orthogonally Redirected Bispecific Lentiviral Vectors for In Vivo CAR-T Cell Generation

Program: Oral and Poster Abstracts
Session: 703. Cellular Immunotherapies: Basic and Translational: Poster I
Hematology Disease Topics & Pathways:
Biological therapies, Research, Lymphomas, Translational Research, B Cell lymphoma, Chimeric Antigen Receptor (CAR)-T Cell Therapies, Diseases, Therapies, Immunotherapy, immunology, Lymphoid Malignancies, Biological Processes, emerging technologies, Technology and Procedures, gene editing, Study Population, Animal model
Saturday, December 9, 2023, 5:30 PM-7:30 PM

Heng Mei1,2*, Zhaozhao Chen, Doctor3,4*, Yu Hu, MD2,5,6* and Heng Mei6,7*

1Department of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
2Hubei Clinical and Research Centre of Thrombosis and Haemostasis, Wuhan, China
3Hubei Clinical Medical Center of Cell Therapy for Neoplastic Disease, Wuhan, China
4Institute of Hematology, Union Hospital,, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
5Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
6Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
7Union hospital of Huazhong University of Science and Technology, Wuhan, CHN

Background: Chimeric antigen receptor T-cell (CAR-T) therapy has emerged as a remarkably efficacious treatment modality in recent years for refractory and relapsed hematopoietic malignancies. However, the exorbitant cost and intricate manufacturing procedure of ex vivo CAR-T cell generation have impeded its broader application. In vivo induced CAR-T therapy offers the potential to circumvent cumbersome manufacturing logistics, thereby providing novel insights into the field of CAR-T treatment. In this study, we have developed a bio-orthogonally redirected bispecific lentiviral vector platform for the reprogramming of circulating T lymphocytes into CAR-T cells and subsequent elimination of tumor cells in vivo.

Methods: To engineer dual-targeting lentiviral vectors (D-LVs), the packing cell lines 293T was labelled with azide groups by glycometabolic bio-orthogonal chemistry (designated N3-293T) firstly, and a CD3 promoter (CD3p) was fused to CAR transfer plasmid. Secondly, azide groups modified LVs were further surface engineered with anti-CD3 antibody (OKT3) via click chemistry. The conjunction of OKT3 and was analyzed using dot immunobinding assay, confocal microscopy and the in vitro transduction efficiency was evaluated using flow cytometry. To demonstrate the ability of targeted transduction and specific cytotoxicity in vivo, D-LVs were intravenously infused into humanized NOD-scid-IL2Rγnull (huNSG) mice engrafted with Nalm6-luc cells. Subsequently, the tumor burden was monitored using a noninvasive bioluminescence imaging system and the in-vivo CD19-CAR-T cells existence were detected by flow cytometry.

Results: By displaying OKT3 on the single lentiviral surface and fused CD3p into the key construct, we could achieve targeted delivery of CD19-CAR genes to T cells both in vitro and in vivo.

Conclusion: These results demonstrate the great potential applications of this engineered lentiviral system as a new strategy for inducing CAR-T immunotherapy in vivo and a promising approach for leading personalized treatment.

Disclosures: No relevant conflicts of interest to declare.

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