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Genetically modified oncolytic adenoviruses have been proposed as a vehicle for cancer therapy. However, several concerns, such as toxicity to normal cells and organs, lack of suitable cell surface receptors to allow viral entry to the desired cell type(s), and activation of both innate and adaptive immune systems in patients, restrict the successful clinical application of adenoviral-mediated cancer gene therapy. Successful virotherapy will require efficient transductional and transcriptional targeting to enhance therapeutic efficacy by ensuring targeted adenoviral infection, replication, and/or therapeutic transgene expression. Targeted modification of viral components, such as viral capsid, fiber knob, and the insertion of transgenes for expression, are prerequisites for the necessary transductional and transcriptional targeting of adenovirus. However, the conventional approach to modify the adenoviral genome is …