RESUMEN
Objective To make better use of the antitumor effects of TNF related apopotosis inducing ligand (TRAIL) ,we con-struct a new fusion protein including TRAIL ,for the sake of improving its purity and targeting to hepatocytes .Methods Fusion protein concluding His label protein and human recombinant TRAIL which linked by constructed specifically u-PA cleavage site . TRAIL protein was obtained by disintigrating from the fusion protein which had been purified .Results The purified His-rh-sTRAIL was demonstrated to be cleavable by u-PA and possess enhanced antitumor effect ,it′s toxicity to hepatocytes was reduced . Conclusion The fusion protein His-rhsTRAIL has antitumor effect on colon cancer cell with high efficiency ,highly targeting and low-toxicity .