Journal: bioRxiv
Article Title: Targeting CHEK2-YBX1&YBX3 regulatory hub to potentiate immune checkpoint blockade response in gliomas
doi: 10.1101/2025.03.09.642289
Figure Lengend Snippet: (A) Schematic representation of the experimental targeting engagement of SU056 timeline. C57BL/6 mice implanted intracranially with GL261 glioma cells, and administration of SUO56 started on day 21. Tumors were collected for WB and IHC analysis between on day 24. (B) Immunoblots of Chk2, Ybx1 and Ybx3 of tumor lysates harvested from brain tumor tissue of mice treated with SU056 or vehicle captisol. (C-D) Representative IHC staining of glioma sections for CD8a in vehicle-treated (C) and SU056-treated (D) mice. Black arrows indicate CD8a+ T cell infiltration into the tumor and brain microenvironment. Insets show magnified views of CD8a+ cells within the tumor. Scale bars: 50 µm, for small images. Scale bars: 2.5 mm, for full image. (E) Quantification of CD8a+ T cell infiltration in glioma sections from C. SU056 treatment significantly increased CD8a+ T cell infiltration compared with the control group. (**, P < 0.01, Student’s t-test). (F) Schematic of the treatment regimen for survival studies. Mice bearing intracranial GL261 gliomas treated with SU056 alone, PD-1 blockade alone, or the combination of SU056 and anti– PD-1 starting on day 7. (F) Kaplan–Meier survival curves for GL261 glioma-bearing mice. Mice were randomized into four groups (n = 10 per group): vehicle + IgG (VC + IgG), VC + anti–PD-1, SU056 + IgG, and SU056 + anti–PD-1. The median survival durations for each group were as follows: VC + IgG, 31.5 days; VC + anti–PD-1, 38.5 days; SU056 + IgG, 51.5 days; and SU056 + anti–PD-1, 71.5 days. Statistical comparisons: VC + IgG vs. SU056 + IgG (P =0.0002); and VC + IgG vs. SU056 + anti– PD-1 (P < 0.0001). (H) Schematic of the treatment regimen for survival studies in NPA glioma-bearing mice. Mice treated with SU056, PD-1 blockade, or their combination following tumor implantation. (I) Kaplan–Meier survival curves for NPA glioma-bearing mice treated as in G. Combination therapy with SU056 and PD-1 blockade significantly improved survival compared with single-agent treatments. Mice were randomized into four groups (n = 10 or n=9 per group): vehicle + IgG (VC + IgG), VC + anti–PD-1, SU056 + IgG, and SU056 + anti–PD-1. The median survival durations for each group were as follows: VC + IgG, 20 days; VC + anti–PD-1, 22 days; SU056 + IgG, 32 days; and SU056 + anti–PD-1, 49.5 days. Statistical comparisons: VC + IgG vs. SU056 + IgG (P =0.0003); and VC + IgG vs. SU056 + anti–PD-1 (P < 0.0001). (J) Schematic of the treatment regimen incorporating PD-L1 blockade in NPA glioma-bearing mice. Mice received SU056, PD-L1 blockade, or their combination. (K) Kaplan–Meier survival curves for NPA glioma-bearing mice treated. Mice were randomized into four groups (n = 10 or n=9 per group): vehicle + IgG (VC + IgG), VC + anti-PD-L1, SU056 + IgG, and SU056 + anti-PD-L1. The median survival durations for each group were as follows: VC + IgG, 20 days; VC + anti-PD-L1, 22 days; SU056 + IgG, 32 days; and SU056 + anti-PD-L1, 65 days. Statistical comparisons: VC + IgG vs. SU056 + IgG (P =0.0003); and VC + IgG vs. SU056 + anti-PD-L1 (P < 0.0001).
Article Snippet: Membranes were incubated overnight at 4°C with primary antibodies: CHK2 (#2662S), YBX1 (#4202S), β-Actin (#4970S), ATM (#2873S), and CHK1 (#2360S) from Cell Signaling, and YBX3 (#TA324558) from Origene.
Techniques: Western Blot, Immunohistochemistry, Control, Tumor Implantation