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Although gene therapy has brought new insights into the treatment of malignant melanoma, targeting delivery of nucleic acid which targets critical oncogene/anti-oncogene in vivo is still a bottleneck in the therapeutic application. Our previous in vitro studies have found that the oncogene Livin could serve as a potential molecular target by small interfering RNA for gene therapy of malignant melanoma. However, how to transport Livin small interfering RNA into malignant melanoma cells specifically and efficiently in vivo needs further investigation. Cumulative evidence has suggested that single-chain antibody–mediated small interfering RNA targeted delivery is an effective way to silence specific genes in human cancer cells. Indeed, this study designed a protamine–single-chain antibody fusion protein, anti-MM scFv-tP, to deliver Livin small interfering RNA into LiBr cells. Further experiments confirmed the induction of cell apoptosis and suppression of cell proliferation by anti-MM scFv-tP in LiBr cells, along with efficient silence of Livin gene both in vitro and in vivo. Altogether, our findings provide a feasible approach to transport Livin small interfering RNA to malignant melanoma cells which would be a new therapeutic strategy for combating malignant melanoma.

Single-chain antibody–delivered Livin siRNA inhibits human malignant melanoma growth in vitro and in vivo