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The aim of this work was to study the anti-tumor effect by combined treatment of arsenic trioxide and interferon-α (IFN-α) in mice injected murine Lewis lung carcinoma (LL2) cells. As a experimental model, LL2 cells (1×10?/mouse) were injected subcutaneously into the back region of mice. When the tumor volume reached about 100 ㎣, mice were treated with 1 ㎎/㎏ arsenic trioxide, 50,000 IU IFN-α, or arsenic trioxide plus IFN-α, respectively. The development of tumor cells was significantly inhibited by combined treatment with arsenic trioxide and IFN-α. In arsenic trioxide and IFN-α treated group, the expression of proliferating cell nuclear antigen (PCNA) was reached a peak level at 0 hr and it was decreased from 12 hr to 48 hr after the treatment. PCNA is known to be associated with S phase and DNA replication of the cell cycle. Whereas, apoptotic index was reached a peak level at 48 hr after the treatment and it was nearly restored to the control level at 8 days. In conclusion, our results suggest that the combined treatment with arsenic trioxide and IFN-α inhibited the growth of LL2 tumor cells through the suppression of cell proliferation and the induction of apoptosis.

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UCI(KEPA) : I410-ECN-0101-2009-510-016362292