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Persistence of hAQP1 expression in human salivary gland cells following AdhAQP1 transduction is associated with a lack of methylation of hCMV promoter

Gene Therapy volume 22, pages 758–766 (2015)Cite this article

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Abstract

In 2012, we reported that 5 out of 11 subjects in a clinical trial (NCT00372320) administering AdhAQP1 to radiation-damaged parotid glands showed increased saliva flow rates and decreased symptoms over the initial 42 days. AdhAQP1 is a first-generation, E1-deleted, replication-defective, serotype 5 adenoviral vector encoding human aquaporin-1 (hAQP1). This vector uses the human cytomegalovirus enhancer/promoter (hCMVp). As subject peak responses were at times much longer (7–42 days) than expected, we hypothesized that the hCMVp may not be methylated in human salivary gland cells to the extent previously observed in rodent salivary gland cells. This hypothesis was supported in human salivary gland primary cultures and human salivary gland cell lines after transduction with AdhAQP1. Importantly, hAQP1 maintained its function in those cells. Conversely, when we transduced mouse and rat cell lines in vitro and submandibular glands in vivo with AdhAQP1, the hCMVp was gradually methylated over time and associated with decreased hAQP1 expression and function in vitro and decreased hAQP1 expression in vivo. These data suggest that the hCMVp in AdhAQP1was probably not methylated in transduced human salivary gland cells of responding subjects, resulting in an unexpectedly longer functional expression of hAQP1.

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Acknowledgements

We thank Cindy Clark, NIH Library Editing Service, for reviewing the manuscript. The Division of Intramural Research, National Institute of Dental and Craniofacial Research, National Institutes of Health, provided all support for this research.

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Authors and Affiliations

  1. Molecular Physiology and Therapeutics Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD, USA,

    C Zheng, B J Baum, X Liu, C M Goldsmith, P Perez, S-I Jang, A P Cotrim, L McCullagh, I S Ambudkar & I Alevizos

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Zheng, C., Baum, B., Liu, X. et al. Persistence of hAQP1 expression in human salivary gland cells following AdhAQP1 transduction is associated with a lack of methylation of hCMV promoter. Gene Ther 22, 758–766 (2015). https://doi.org/10.1038/gt.2015.55

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