Toosendanin is a natural diterpenoid compound found in the barks of Melia toosendan Sieb. et Zucc. Toosendanin shows hepatotoxicity and is also an effective insecticide for Ae.Toosendanin (TSN) was used as a digestive tract-parasiticide and agricultural insecticide in ancient China;TSN is a selective presynaptic blocker, a L-type Ca 2+ channel agonist and an effective antibotulismic agent, by interfering with neurotransmitter release through an initial facilitation followed by a subsequent depression. TSN has effects on the growth, cell cycle arrest, induction of apoptosis and the involved signaling pathway in human promyelocytic leukemia HL-60 cells.