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Previous studies using different techniques have shown that adenoviral-mediated gene transfer to different tissues, including the kidney, is more efficient in neonatal mice. In this study, we report a simple technique that allows an efficient and long term expression of beta-galactosidase (beta-gal) in the heart of newborn mice. Newborn and adult C57BL6/J mice were subjected to a single retro-orbital venous plexus injection of recombinant adenoviral vectors (rAd) (2 x 10(9) particles/g body weight) carrying the lac Z gene. Seven days after the injection, positive beta-gal staining was systematically observed in the heart, lung, intestine, liver, kidney and spleen of newborn mice. However, only the heart showed persistent expression of beta-gal one year after the initial injection. In contrast, adult mice showed only significant but transient beta-gal expression mainly in the liver. In summary, we have found that a single retro-orbital intravenous injection can be used to establish a long-term adenoviral-mediated gene transfer to cardiac cells of newborn mice.

A Simple Technique to Establish a Long-Term Adenovirus Mediated Gene Transfer to the Heart of Newborn Mice