Abstract
Recent studies have demonstrated that cardiac and skeletal myocytes share the ability to take up and stably express plasmid DNA injected directly into myocardium or skeletal muscle in vivo. Although this is a relatively inefficient process, with less than 1% of the myocytes expressing the injected recombinant DNA, expression in these cells is stable for periods of at least 6 months. The majority of the injected DNA is maintained in myocytes as an episome and apparently does not undergo DNA replication. The direct DNA injection approach has been used to map cardiac-specific transcriptional regulatory elements in cellular promoter/enhancers. Expression of recombinant proteins in the heart following direct DNA injection also holds promise for the treatment of a variety of acquired and inherited cardiovascular diseases.
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