Abstract
There have been consistent efforts in concomitant administration of chemotherapeutic agents such as doxorubicin beside other more tumor-specific drugs in order to increase sensitivity of tumor cells to the cytotoxicity of doxorubicin and reduce necessary chemotherapeutic dosage. Telomerase-targeted therapy for cancer has received great attention because telomerase is expressed in almost all cancer cells but is inactive in most normal somatic cells. The present study was aimed to investigate the effect of telomerase inhibitor MST-312, a chemically modified derivative of epigallocatechin gallate (EGCG), on doxorubicin-induced apoptosis in pre-B acute lymphoblastic leukemia cells. The pre-B ALL cell lines (NALM-6 and REH) were cultured and treated with MST-312 and doxorubicin, separately and in combination. Cell viability was measured by trypan blue staining and MTT assay. Annexin-V/7-AAD staining by flow cytometry was used for evaluation of apoptosis. Gene expression of hTERT, c-Myc, Bax and Bcl-2, was detected by the quantitative Real-Time PCR. Our results showed that MST-312 exerted dose-dependent short-term cytotoxic and apoptotic effects on pre-B ALL cells. Combination of MST-312 and doxorubicin synergistically enhanced the c...Continue Reading
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