Abstract
ABSTRACTA novel type of liposomal vector for gene therapy is described (Artificial Virus Particles; AVPs). This vector is based on the composition of retroviral envelopes, serum-resistant and non-toxic and smaller than 200 nm in size. The DNA is condensed using low molecular weight branched PEI. Equipment of these particles with a cyclic RGD peptide ligand as targeting device renders them selective for tumor endothelial and melanoma cells expressing high levels of αvβ3-integrins, and allows for an efficient delivery of the enclosed genetic material. The specificity of the vector system for melanoma cells could be further improved by using a melanocyte-specific tyrosinase promoter to drive transgene expression.
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