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This study was designed to isolate the compounds responsible for the cytotoxic properties of South Indian Elephantopus scaber L. and further investigate their effects on quiescent and proliferating cells. Bioassay-guided isolation of the whole plant of chloroform extract of South Indian Elephantopus scaber afforded the known sesquiterpene lactone, deoxyelephantopin, and isodeoxyelephantopin whose structures were determined by spectroscopic methods. These compounds caused a dose dependent reduction in the viability of L-929 tumour cells in 72 h culture (IC50 value of 2.7 μg/mL and 3.3 μg/mL) by the cell viability assay. Both the compounds act selectively on quiescent and PHA-stimulated proliferating human lymphocytes and inhibited tritiated thymidine incorporation into cellular DNA of DLA tumour cells. The compound deoxyelephantopin at a concentration of 3 μg/mL caused maximum apoptotic cells. It also exhibited significant in vivo antitumour efficacy against DLA tumour cells. The results, therefore, indicate that the antiproliferative property of deoxyelephantopin and isodeoxyelephantopin could be used in regimens for treating tumors with extensive proliferative potencies

journal of biomedicine and biotechnology

Sesquiterpene Lactones Isolated from<i>Elephantopus scaber</i>L. Inhibits Human Lymphocyte Proliferation and the Growth of Tumour Cell Lines and Induces Apoptosis<i>In Vitro</i>

Sesquiterpene Lactones Isolated fromElephantopus scaberL. Inhibits Human Lymphocyte Proliferation and the Growth of Tumour Cell Lines and Induces ApoptosisIn Vitro