Abstract
Insulin gene therapy in clinical medicine is currently hampered by the inability to regulate insulin secretion in a physiological manner, the inefficiency with which the gene is delivered, and the short duration of gene expression. To address these issues, we injected the liver of streptozotocin-induced diabetic rats with hemagglutinating virus of Japan-envelope (HVJ-E) vectors containing Epstein–Barr virus (EBV) plasmids encoding the genes for insulin and the GLUT 2 transporter. Efficient delivery of the genes was achieved with the HVJ-E vector, and the use of the EBV replicon vector led to prolonged hepatic gene expression. Blood glucose levels were normalized for at least 3 weeks as a result of the gene therapy. Cotransfection of GLUT 2 with insulin permitted the diabetic rats to regulate their blood glucose levels upon exogenous glucose loading in a physiologically appropriate manner and improved postprandial glucose levels. Moreover, cotransfection with insulin and GLUT 2 genes led to in vitro glucose-stimulated insulin secretion that involved the closure of KATP channels. The present study represents a new way to efficiently deliver insulin gene in vivo that is regulated by ambient glucose level with prolonged gene expression. This may provide a basis to overcome limitations of insulin gene therapy in humans.
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Acknowledgements
This work was supported by the Grant No. RTI04-01-01 and RTI04-03-02 from the Regional Technology Innovation Program of the Ministry of Commerce, Industry and Energy (MOCIE). We thank Ishihara Sangyo Kaisha, Ltd (Osaka, Japan) for donating HVJ-E vector.
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Kim, Y., Park, KG., Morishita, R. et al. Liver-directed gene therapy of diabetic rats using an HVJ-E vector containing EBV plasmids expressing insulin and GLUT 2 transporter. Gene Ther 13, 216–224 (2006). https://doi.org/10.1038/sj.gt.3302644
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DOI: https://doi.org/10.1038/sj.gt.3302644
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