Objective To evaluate the possibility and efficiency of nanoparticle as a new vector in specific gene transference. Methods Nanoparticle DNA complex was prepared with PLGA bearing antisense monocyte chemotactic protein 1 (A MCP 1), a specific expression gene, and the package efficiency, release progress in vitro, and size of the complex were determined. The nanoparticl DNA was trasnsfected into the cultured smooth muscle cells. PCR was used to evaluate the transfection of A MCP 1. Cationic lipid (l...