(-)-Cryptopleurine is an alkaloid that has been found inLauraceaeand has diverse biological activities.¹It inhibits the growth of human A375 melanoma, A431 epidermoid carcinoma, A549 lung, MES-SA uterine sarcoma, and MCF-7 breast cancer cells (IC₅₀= 3 nM for all).²(-)-Cryptopleurine inhibits hypoxia-induced gene expression in a hypoxia response element (HRE) reporter assay (IC₅₀= 8.7 nM).³(-)-Cryptopleurine (500 ?g/ml) prevents lesion formation in tobacco (N. tabacum) plants infected with tobacco mosaic virus (TMV).¹It also inhibits protein synthesis by yeast and mammalian ribosomes.^4,5

1.Wang, Z., Feng, A., Cui, M., et al.First discovery and stucture-activity relationship study of phenanthroquinolizidines as novel antiviral agents against Tobacco Mosaic Virus (TMV)PLoS One7(12)e52933(2012) 2.Banwell, M.G., Bezos, A., Burns, C., et al.C8c-C15 monoseco-analogues of the phenanthroquinolizidine alkaloids julandine and cryptopleurine exhibiting potent anti-angiogenic propertiesBioorg. Med. Chem. Lett.16(1)181-185(2006) 3.Cai, X.F., Jin, X., Lee, D., et al.Phenanthroquinolizidine alkaloids from the roots of Boehmeria pannosa potently inhibit hypoxia-inducible factor-1 in AGS human gastric cancer cellsJ. Nat. Prod.69(7)1095-1097(2006) 4.Battaner, E., and Vazquez, D.Inhibitors of protein synthesis by ribosomes of the 80-S typeBiochim. Biophys. Acta254(2)316-330(1971) 5.Pestka, S., Rosenfeld, H., Harris, R., et al.Studies on transfer ribonucleic acid-ribosome complexes. XXI. Effect of antibiotics on peptidyl-puromycin synthesis by mammalian polyribosomesJ. Biol. Chem.247(21)6895-6900(1972)