Journal: Research

Article Title: Novel Combination of Irreversible Electroporation and Allogenic Chimeric Antigen Receptor T-Cell Therapy Synergizes Therapeutic Outcomes in a Preclinical Human Pancreatic Cancer Mouse Model

doi: 10.34133/research.1105

Figure Lengend Snippet: Chimeric antigen receptor (CAR) target binding analysis following irreversible electroporation. (A) Viable and intact cells following electroporation are still available for cell membrane mesothelin (MSLN) binding, while necrotic cells experience a decrease in binding. (B) Flow cytometry gating to isolate single cells and plots of calcein AM versus mesothelin at 3 h following IRE delivery using 0 V/cm (control), 1,000 V/cm, and 2,000 V/cm. (C) Control using mesothelin-negative Jurkats. (D) Mesothelin expression in AsPC-1 cells compared to that in Jurkats. (E) Cell viability 3 h after electroporation at different electric field strengths; one-way analysis of variance (ANOVA) with Tukey’s posttest and correction; mean ± SD; n = 4. (F) Percent mesothelin (Mes) expression of high-viability and low-viability cell populations 3 h after electroporation; multiple 2-tailed t test; mean ± SD; n = 4. (G) Live (green) and dead (red) imaging at 3 h and 7 d after treatment; the scale bar is 1 mm. (H) Viable cell count at different electric fields after IRE and following recovery; one-way ANOVA with Tukey’s posttest and correction within each timepoint; mean ± SD; n = 4. (I) Mesothelin binding for recovered cells at day 7; one-way ANOVA with Tukey’s posttest and correction within each timepoint; mean ± SD; n = 4. ns, not significant; ** P < 0.01; *** P < 0.001; **** P < 0.0001. IL-2, interleukin-2; IL-15, interleukin-15; IFNγ, interferon-γ; FSC-H, forward scatter height; FSC-A, forward scatter area.

Article Snippet: The cells were again centrifuged and resuspended with 1 μl (10 μl/10 6 cells) Human Mesothelin Alexa Fluor 488-conjugated Antibody (R&D Systems, FAB32652G) and 0.5 μl of Invitrogen CellTrace Calcein Red-Orange, AM (Fisher Scientific, 50-113-7411) in 500 μl of flow cytometry buffer.

Techniques: Binding Assay, Electroporation, Membrane, Flow Cytometry, Control, Expressing, Imaging, Cell Characterization