Okadaic Acid is a potent non-TPA type tumor promoter and vasodilator. It induces hyperphosphorylation of the P53 oncoprotein

Leptomycin B is an important tool in the study of nuclear export. Leptomycin B is twice as potent as Leptomycin A Leptomycin B (LPB) was originally discovered as a potent anti-fungal antibiotic from Streptomyces sp. However, recent data (2003) showed that Leptomycin causes G1 cell cycle arrest in mammalian cells and is a potent anti-tumor agent against murine experimental tumors. Leptomycin B is a potent and specific nuclear export inhibitor. Leptomycin B alkylates and inhibits CRM1 (chromosomal region maintenance)/exportin 1, a protein required for nuclear export of proteins containing a nuclear export sequence (NES). In addition to antifungal and antibacterial activities, Leptomycin B blocks the cell cycle and is a potent anti-tumor agent. At low nM concentrations, Leptomycin B blocks the nuclear export of many proteins including HIV-1 Rev, MAPK/ERK, and NF-κB/IκB, and it stabilizes the expression of p53. Leptomycin B also inhibits the export and translation of many RNAs, including COX-2 and c-Fos mRNAs, by inhibiting export of ribonucleoproteins.

KT5823 induces apoptotic fragmentation of DNA

K252c inhibits protein kinase C. Its reported IC50 value of 214 nM on rat brain enzyme K252c is cytotoxic for A549 and P388 cancer celllines showing IC50 = 2-3 μM

K252a is a highly potent cell permeable inhibitor of CaM kinase and phosphorylase kinase . At high concentrations it also inhibitors of serine/threonine protein kinases. K252a inhibits tyrosine phosphorylation of Trk A induced by NGF K252a is reported to promote myogenic differentiation in C2 mouse myoblasts

Cordycepin inhibits growth of various tumor cells in vitro. It may be converted to 3'-deoxyadenosine triphosphate , thus inhibiting ATP-dependent DNA synthesis. Cordycepin is used in the study of messenger RNA transcription.