Calcium and survivin are involved in the induction of apoptosis by dihydroartemisinin in human lung cancer SPC-A-1 cells

Dihydroartemisinin (DHA), a semisynthetic derivative of artemisinin isolated from the traditional Chinese herb Artemisia annua. is an effective novel antimalarial drug. Recent studies suggest that it also has anticancer effects. The present study investigated the apoptosis activity of DHA in cultured human lung cancer cells by terminal deoxynucleotidyl transferase dUTP nick-end labelling (TUNEL) assay and flow cytometry. Intracellular free calcium concentrations in the lung cancer cells were evaluated by laser scanning confocal microscopy using Fura-3/AM as probe. The observations also indicated that DHA downregulated the mRNA and protein expression level of survivin in the lung cancer cell line SPC-A-1 cells, whereas it did not affect those of caspase-4. These results demonstrated that DHA can induce apoptosis of lung cancer cell line SPC-A-1 cells and that calcium and survivin participated in the apoptotic signalling pathways. (c) 2007 Prous Science. All rights reserved.