GPD2 and glioma: demonstrated that interleukin 1β (IL-1β) produced by M2 macrophages activated phosphorylation of the glycolytic enzyme glycerol-3-phosphate dehydrogenase (GPD2) at threonine 10 (GPD2 pT10) through phosphatidylinositol-3-kinase-mediated activation of protein kinase-delta (PKCδ) in glioma cells.