Development of anti-severe acute respiratory syndrome associated coronavirus (SARS-CoV) agents is pivotal to prevent the reemergence of the life-threatening disease, SARS. In this study, more than 200 extracts from Chinese medicinal herbs were evaluated for anti-SARS-CoV activities using a cell-based assay that measured SARS-CoV-induced cytopathogenic effect (CPE) in vitro on Vero E6 cells. Six herbal extracts, one each from Gentianae Radix ( lóng dan; the dried rhizome of Gentiana scabra), Dioscoreae Rhizoma ( shan yào; the tuber of Dioscorea batatas), Cassiae Semen (jué míng zi; the dried seed of Cassia tora) and Loranthi Ramus (sang jì sheng; the dried stem, with leaf of Taxillus chinensis) (designated as GSH, DBM, CTH and TCH, respectively), and two from Rhizoma Cibotii (gou ji; the dried rhizome of Cibotium barometz) (designated as CBE and CBM), were found to be potent inhibitors of SARS-CoV at concentrations between 25 and 200 μg/ml. The concentrations of the six extracts needed to inhibit 50% of Vero E6 cell proliferation (CC50) and 50% of viral replication (EC50) were determined. The resulting selective index values (SI = CC50/EC50) of the most effective extracts CBE, GSH, DBM, CTH and TCH were > 59.4, > 57.5, > 62.1, > 59.4, and > 92.9, respectively. Among these extracts, CBM and DBM also showed significant inhibition of SARS-CoV 3CL protease activity with IC50 values of 39 μg/ml and 44 μg/ml, respectively. Our findings suggest that these six herbal extracts may have potential as candidates for future development of anti-SARS therapeutics. Copyright © 2011 Committee on Chinese Medicine and Pharmacy, Taiwan.
Wen, C. C., Shyur, L. F., Jan, J. T., Liang, P. H., Kuo, C. J., Arulselvan, P., … Yang, N. S. (2011). Traditional chinese medicine herbal extracts of cibotium barometz, gentiana scabra, dioscorea batatas, cassia tora, and taxillus chinensis inhibit sars-cov replication. Journal of Traditional and Complementary Medicine, 1(1), 41–50. https://doi.org/10.1016/S2225-4110(16)30055-4