Abstract
To test whether hepatocytes engineered in vivo can serve as surrogate β cells by similarly secreting mature insulin in a glucose-sensitive manner, we prepared adenoviral vectors encoding wild-type proinsulin (hIns-wt), a modified proinsulin cleavable by the ubiquitously expressed protease furin (hIns-M3), or each of the two β cell specific pro-insulin convertases PC2 and PC3. Following a detailed in vitro characterization of the proteins produced by our vectors, we infected the liver and, for comparison, the muscle of a chemically induced murine model of type I diabetes. Insulin expression from the transduced tissues was extensively characterized and showed to be constitutive rather than regulated. To obtain regulated expression, we placed expression of hIns-M3 under the control of the dimerizer-inducible transcription system. Hormone secretion from mouse liver was negligible in the absence of the dimerizer drug rapamycin, was inducible in a dose-dependent manner upon its administration, and reversible following drug withdrawal. These data confirm liver as a promising target for in vivo expression of processed insulin. While suggesting that hepatocytes cannot provide authentic glucose-responsive regulation, these results demonstrate that pharmacological regulation is a promising alternative route to the controlled delivery of insulin following hepatic gene transfer.
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Acknowledgements
The technical assistance of the Animal Models group, Vector and Cell Morphology Cores of the Institute for Human Gene Therapy and of Xiurong Wang is gratefully acknowledged. We thank Alex Shifrin for helping with the animal studies. This work was supported by the NIH (P30 DK47757-07) and the Juvenile Diabetes Foundation. JMW holds equity in Targeted Genetics. AA is recipient of a fellowship from Telethon-Italia (371/B).
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Auricchio, A., Gao, GP., Yu, Q. et al. Constitutive and regulated expression of processed insulin following in vivo hepatic gene transfer. Gene Ther 9, 963–971 (2002). https://doi.org/10.1038/sj.gt.3301746
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DOI: https://doi.org/10.1038/sj.gt.3301746
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