Salivary glands are an attractive target for gene transfer. Salivary epithelial cells are considered to be highly differentiated and have low rates of cell division (∼6 months), affording the opportunity to obtain relatively long-term transgene expression in the absence of genomic integration. Here, we report a novel modified hybrid adenoretroviral vector, which provides stable transgene expression in salivary epithelial cells in vivo for up to 6 months in the absence of genomic integration. This modified hybrid vector, AdΔE1/3LTR2EF1α-hEPO, encodes human erythropoietin (hEPO) and differs from a previously developed hybrid vector, AdLTR2EF1α-hEPO, by having more extensive E3 gene deletion. Following direct salivary gland gene transfer by retroductal cannulation, rats transduced with AdΔE1/3LTR2EF1α-hEPO had sustained, elevated serum hEPO levels and hematocrits for 6 months (length of experiment), as compared with ∼2 months for animals administered the AdLTR2EF1α-hEPO vector. Immunohistochemistry demonstrated that this novel vector could transduce both acinar and ductal cells. Interestingly, the AdΔE1/3LTR2EF1α-hEPO vector evoked much weaker local (salivary gland) immune responses than seen after AdLTR2EF1α-hEPO vector delivery, which likely permits its significantly lengthened transgene expression in this tissue.
Zheng and colleagues describe a novel modified hybrid adenoretroviral vector, which can provide stable transgene expression in salivary epithelial cells in rats in vivo for up to six months in the absence of genomic integration. Immunohistochemistry demonstrates that this novel vector could transduce both acinar and ductal cells.
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