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[Inhibitory effects of a combination of rmhTRAIL and gemcitabine on human non-small cell lung cancer cell line NCI-H460 cells in vitro and in vivo].

OBJECTIVE: To evaluate the inhibitory effects of recombinant mutant tumor necrosis factor-related apoptosis-inducing ligand (rmhTRAIL) combined with chemotherapeutic agent gemcitabine (GEM) on human lung cancer cell line NCI-H460 cells in vitro and in vivo.

METHODS: MTT was used to evaluate the cytotoxic effects of rmhTRAIL and GEM either used alone or in combination treatment on NCI-H460 cells. BAL B/c nude mice were transplanted with NCI-H460 tumor. The tumor-bearing nude mice were randomly divided into 6 groups (n = 6): negative control group (to be injected intraperitoneally with normal saline); rmhTRAIL group; GEM group; rmhTRAIL plus GEM group; GEM plus DDP group; rmhTRAIL plus GEM andDDP group. The tumor size was measured every 3 - 4 days. Twenty one days after the administration of different drugs the mice were killed and the tumors were taken out and weighed.

RESULTS: The growth inhibition of NCI-H460 cells was dose-dependent after exposure to rmhTRAIL, GEM alone or together. The combination of rmhTRAIL and GEM showed a synergistic inhibitory effect at different concentrations. The relative tumor volume of rmhTRAIL group, rmhTRAIL plus GEM group, GEM plus DDP group and rmhTRAIL plus GEM and DDP group were 4.75 +/- 3.04, 2.53 +/- 1.25, 4.52 +/- 2.87, and 1.69 +/- 0.97, respectively, all significantly smaller than that of the negative control group (8.82 +/- 5.62, P < 0.05 or P < 0.01). The tumor weight of these four groups were (2.23 +/- 0.29) g, (1.12 +/- 0.77) g, (2.51 +/- 0.87) g, and 0.60 +/- 0.18 g, respectively, all significantly less then that of the negative control group (4.71 g +/- 0.97 g, all P < 0.01). Both the relative tumor volume and tumor weight of rmhTRAIL plus GEM group were significantly smaller than those of either rmhTRAIL group or GEM group (P < 0.05 and P < 0.01, respectively). Both the relative tumor volume and tumor weight of rmhTRAIL plus GEM and DDP group were significantly smaller than those of either rmhTRAIL group or GEM plus DDP group (P < 0.05 and P < 0.01, respectively).

CONCLUSION: The combination of rmhTRAIL and GEM has a synergistic inhibitory effect on human NSCLC cell line NCI-H460 cells either in vitro and in vivo.

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