CXCL1/2/8, NF-κB, AKT and PD-L1 expressions after transfection. Supernatant CXCL1 (A), CXCL2 (B), CXCL8 (C) levels, and cell NF-κB p65, p-NF-κB p65, AKT, p-AKT, PD-L1 (D) expressions among groups in U-87 MG cells. Supernatant CXCL1 (E), CXCL2 (F), CXCL8 (G) levels, and cell NF-κB p65, p-NF-κB p65, AKT, p-AKT, PD-L1 (H) expressions among groups in U-251 MG cells. AKIP1, A-kinase-interacting protein 1; NC, negative control; CXCL, C-X-C motif chemokine ligand.