Novel Biological Response Modifiers: Phthalimides with Tumor Necrosis Factor-α Production-Regulating Activity

Novel N-substituted phthalimides (2-substituted 1H-isoindole-1,3-diones) were prepared, and their effects on tumor necrosis factor-α (TNF-α) production by human leukemia cell line HL-60 stimulated with 12-O-tetradecanoylphorbol 13-acetate (TPA) or okadaic acid (OA) were examined. A structure−activity relationship study of the N-phenylphthalimides and N-benzylphthalimides revealed that their enhancing effect on TPA-induced TNF-α production by HL-60 cells and their inhibiting effect on OA-induced TNF-α production by HL-60 cells are only partially correlated.