Journal: Biomaterials Research

Article Title: A Peptide Inhibitor of Lymphocyte Activation Gene-3 Interaction with Fibrinogen-like Protein 1 Synergizes with Programmed Death-Ligand 1 Blockade to Restore T Cell Activity and Inhibit Tumor Growth

doi: 10.34133/bmr.0364

Figure Lengend Snippet: Combined treatment with LAG3pep-2 and anti-programmed death-ligand 1 (anti-PD-L1) antibody restores T cell activity against tumor cells. (A) Experimental schemes. CD8+ T cells were isolated from the spleen of MC38 tumor-bearing mice and incubated for 48 h with anti-CD3/CD28 beads (activation) and interleukin-2 (IL-2)/interleukin-15 (IL-15) (proliferation). The activated T cells were co-cultured with MC38 cells in the absence or presence of LAG3pep-2 and anti-mouse PD-L1 antibody alone or in combination. Created with BioRender.com . (B) Activated CD8+ T cells were stained with carboxyfluorescein succinimidyl ester (CFSE) dye and co-cultured with tumor cells for 24 h. The population of CD3+/CFSE− cells was measured. (C to E) After co-culturing for 24 h, the culture medium was collected, and the percentage of cell death (lactate dehydrogenase [LDH] release) (C) and the concentrations of interferon-γ (IFN-γ) (D) and granzyme B (E) were measured. Data are presented as the mean ± SD of 3 independent experiments. * P < 0.05; ** P < 0.01; *** P < 0.001; ns, not significant by one-way analysis of variance (ANOVA).

Article Snippet: The CD8+ T cells were stained with 5 μM of carboxyfluorescein succinimidyl ester (CFSE) dye (Thermo Fisher Scientific) in an incubator at 37 °C for 20 min and then co-cultured with tumor cells for 24 h. Next, cell proliferation was examined by counting the CD3+ T cells using a flow cytometer.

Techniques: Activity Assay, Isolation, Incubation, Activation Assay, Cell Culture, Staining