[Therapeutic effects of recombinant mutant human tumor necrosis factor-related apoptosis-inducing ligand on non-small lung cell cancer: an experimental with rats].

OBJECTIVE: To evaluate the therapeutic effects of recombinant mutant human tumor necrosis factor-related apoptosis-inducing ligand (rmhTRAIL) on non-small cell cancer (NSCLC). METHODS: NSCLC cells of the line NCI-H460 were cultured and underwent agarose gel electrophoresis. rmhTRAIL of different concentrations was added into the culture fluid to observe the influence of rmhTRAIL. Nude BALB/c rats were transplanted with rat NCI-H460 tumor. Then the rats carrying xenografts were randomly divided into 5 groups of 8 rats: negative control group to be injected intraperitoneally with normal saline; positive control group to be injected with vancristine; low-dose rmhTRAIL group, to be injected with 1.7 mg/kg rmhTRAIL, middle-dose rmhTRAIL group to be injected with rmhTRAIL 5.0 mg/kg, and high-dose rmhTRAIL group to be injected with 15.0 mg/kg rmhTRAIL. The size of tumor was measured every 3 approximately 4 days. Ten days after the administration of different drugs the rats were killed and the tumors were taken out to undergo TUNEL staining for microscopy. RESULTS: The relative tumor volume of the low-dose rmhTRAIL group and high-dose rmhTRAIL group were 3.19 +/- 2.05 and 1.47 +/- 0.77 respectively, both significantly smaller than that of the negative group (8.48 +/- 5.87, P < 0.05 and P < 0.01). The relative tumor growth rate of the low-dose rmhTRAIL group and high-dose rmhTRAIL group were 37.6% and 17.3% respectively. The tumor weight of low-dose rmhTRAIL group and high-dose rmhTRAIL group were 1.09 g +/- 0.55 g and 0.31 g +/- 0.09 g respectively, both significantly lighter than that of the negative control group (2.78 +/- 0.77, both P < 0.01). Large amount of apoptotic cells were seen in the tumor tissues of the rmhTRAIL -treated rats and tumors cells cultured with rmhTRAIL. Agarose gel electrophoresis showed apoptosis-characteristic ladder in the DNA extracted from the rmhTRAIL -treated tumors cells. CONCLUSION: rmhTRAIL dose-dependently inhibit the growth of NSCLC cells, primarily by inducing apoptosis of tumor cells.