Abstract
The adenovirus (Ad) penton base protein facilitates viral infection by binding cell surface integrins, triggering receptor-mediated endocytosis and mediating endosomal penetration. Given these multiple functions, recombinant penton base proteins have been utilized as non-viral vehicles for gene transfer by our lab and others. Although we have previously demonstrated that penton base-derived vectors undergo integrin-specific binding and cell entry, less than desirable levels of gene expression have led us to re-evaluate the recombinant penton base as an agent for gene delivery. To do so, we have examined here the intracellular trafficking of an Ad serotype 5 (Ad5) recombinant penton base protein (PB). Here, we not only observed that PB utilizes a similar, typical trafficking pathway of whole Ad, but also found that PB entered HeLa cells through pathways not yet identified as contributing to cell entry by the whole virus. We show by high-resolution confocal microscopy and biochemical methods that binding to αv-integrins is a requirement for cell entry, but that early internalization stages did not substantially pass through clathrin-positive and early endosomal compartments. Moreover, a subpopulation of internalized protein localized with caveolin-positive compartments and Golgi markers, suggesting that a certain percentage of proteins pass through non-clathrin-mediated pathways. Similar to the virus, trafficking toward the nucleus was affected by disruption of microtubules and dynein. The majority of penton base molecules avoided the lysosome while facilitating early vesicle release of low molecular weight dextran molecules. In further support of a vesicle escape capacity, a subpopulation of internalized penton base appeared to enter the nucleus, as observed by high-resolution confocal microscopy and cell fractionation. As a confirmation of these findings, we demonstrate that a recombinant penton base facilitated cytosolic entry of an siRNA molecule as observed by RNA interference of a marker gene. Based on our findings here, we suggest that whereas soluble penton base proteins may enter cells through clathrin- and non-clathrin-mediated pathways, vesicle escape and nuclear delivery appear to be supported by a clathrin-mediated pathway. As our previous efforts have focused on utilizing recombinant penton base proteins as delivery agents for therapeutics, these findings allow us to evaluate the use of the penton base as a cell entry and intracellular trafficking agent, and may be of interest concerning the development of vectors for efficient delivery of therapeutics to cells.
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Acknowledgements
We thank the following people for helpful discussions on this work: Raj Batra, Maria Castro, Xinhua Chen, Nori Kasahara, Larry Kedes, Pedro Lowenstein and Kolja Wawrowsky. This work was supported by grants to LKM-K from the National Institutes of Health (CA102126), the Susan G Komen Breast Cancer Foundation (BCTR02-1194), the American Cancer Society (IRG individual allocation) and the Donna and Jesse Garber award. SHA and JX were supported by EY-13949 from the National Eye Institute. SHA was additionally supported by EY-11386, EY-05081, DK-56040 and GM-59297. MM was supported by NIH P30 DK48522 (Confocal Microscopy Subcore, USC Center for Liver Diseases).
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Rentsendorj, A., Xie, J., MacVeigh, M. et al. Typical and atypical trafficking pathways of Ad5 penton base recombinant protein: implications for gene transfer. Gene Ther 13, 821–836 (2006). https://doi.org/10.1038/sj.gt.3302729
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DOI: https://doi.org/10.1038/sj.gt.3302729
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