Journal: Journal for Immunotherapy of Cancer
Article Title: Overcoming tumor heterogeneity by ex vivo arming of T cells using multiple bispecific antibodies
doi: 10.1136/jitc-2021-003771
Figure Lengend Snippet: Ex vivo armed T cells with multiple BsAbs (multi-EATs). (A) Surface BsAb density on multi-EAT was analyzed using anti-human IgG Fc-specific antibody and quantified using quantum beads. Geometric mean fluorescence intensities (MFIs) of EATs were measured with increasing arming doses of each BsAb, and BsAb density (MFI) of EAT was referenced to antibody-binding capacity (ABC). (B) In vitro cytotoxicity of multi-EATs and CD33-EATs against CD33(+) MOLM13 cell line at increasing E:T ratios and increasing BsAb arming doses. The optimal BsAb densities on T cells were extrapolated from the ADTC assays. (C) In vitro cytotoxicity of multi-EATs was tested against a panel of tumor cell lines (E:T ratio was 10:1) and compared with mono-EATs. ABC, antibody binding capacity; ADTC, antibody-dependent T cell-mediated cytotoxicity; BsAbs, bispecific antibodies; EATs, ex vivo armed T cells; E:T, effector to target.
Article Snippet: Neuroblastoma cell line, IMR-32 (ATCC Cat# CCL-127, RRID:CVCL_0346), osteosarcoma cell line, 143B (ATCC Cat# CRL-8303, RRID:CVCL_2270), primitive neuroectodermal tumor cell line TC-32 (RRID:CVCL-7151), breast cancer cell line HCC1954 (ATCC Cat# CRL-2338, RRID:CVCL_1259), gastric cancer cell line NCI-N87 (ATCC Cat# CRL-2338, RRID:CVCL_1259), acute monocytic leukemia (AML-M5a) cell line MOLM13 (DSMZ Cat# ACC-554, RRID:CVCL_2119), prostate cancer cell line LNCaP-AR (ATCC Cat# CRL-1740, RRID:CVCL_1379), and melanoma cell line M14 (NCI-DTP Cat# M14, RRID:CVCL_1395) were used for experiments.
Techniques: Ex Vivo, Fluorescence, Binding Assay, In Vitro