APOPTOSIS INDUCED BY TNF-α COMBINED WITH 5-Fu AND WITH EXPRESSION OF BCL-2 GENE IN COLON CANCER CELLS

Objective:To study the effect of recombined TNF α combined with induction of apoptosis and its relation with expression of bcl 2 in SW480 human colon cancer cells.Methods:The inhibitive effect of 5 Fu and TNF α was measured by MTT.Apoptosis of colon cancer cells was studied by TUNEL.The expression of bcl 2 gene was determined by immunohistochemical analysis.Results:After SW480 colon cancer cells were treated with combination in various concentration of 5 Fu and 3 000 U/mL of TNF α for 48 h,MTT assay revealed a significant decrease of relative viability in compasrison to the control.When SW480 colon cancer cells were treated with 3 000 U/mL of TNF α and 125 ug/mL of 5 Fu in combination for 48 h,TUNEL method showed the number of nick end positive cells was significantly increased in comparison to the control.The expression level of bcl 2 gene lowered significantly than that of the control group.Conclusion:These results confirmed that combined TNF α and 5 Fu could synergistically induce apoptosis in SW480 cells and decrease the expression level of bcl 2 gene.