Immune cells and immunoregulatory factors in glioma TME.
(A) Immune cells include glioma-associated microglia and macrophages (GAMs), T regulatory lymphocytes (Tregs), myeloid-derived suppressor cells (MDSCs), tumor-infiltrating dendritic cells (TIDCs), natural killer (NK), CD4/CD8 T cells. (B) Immunoregulatory factors include hepatocyte growth factor (HGF)/scatter factor (SF), glial-derived neurotrophic factor (GDNF), monocyte chemotactic proteins (MCPs), CCL/CCR families, vascular endothelial growth factor (VEGF), cyclooxygenase-2 (COX-2), fibroblast growth factor (FGF), interleukin-6/ interleukin-8 (IL-6/IL-8), glycoprotein A repetition predominant (GARP), interleukin-10 (IL-10), programmed cell death protein 1 (PD1) or its ligand (PD-L1), transforming growth factor β (TGF-β), interleukin-4 (IL-4), macrophage and granulocyte-macrophage colony-stimulating factors (M-CSF, GM-CSF), epidermal growth factor (EGF)/epidermal growth factor receptor (EGFR).