Abstract
Sinusoidal fenestrae may restrict the transport of gene transfer vectors according to their size. Using Vitrobot technology and cryo-electron microscopy, we show that the diameter of human adenoviral serotype 5 vectors is 93 nm with protruding fibers of 30 nm. Thus, a diameter of fenestrae of 150 nm or more is likely to be sufficient for passage of vectors from the sinusoidal lumen to the space of Disse and subsequent uptake of vectors in hepatocytes. The average diameter of fenestrae in New Zealand White rabbits (103±1.3 nm) was 1.4-fold (P<0.0001) lower than in C57BL/6 mice (141±5.4 nm). The percentage of sinusoidal fenestrae with a diameter larger than 150 nm was 10-fold (P<0.01) lower in rabbits (3.2±0.24%) than in C57BL/6 mice (32±5%), and this resulted in 8.8-fold (P=0.01) lower transgene DNA levels in hepatocytes in rabbits after adenoviral transfer. Injection of N-acetylcysteine combined with transient liver ischemia preceding intraportal transfer in rabbits increased the percentage of sinusoidal fenestrae above 150 nm 2.0-fold (P<0.001) and increased transgene DNA levels in hepatocytes 6.6-fold (P<0.05). In conclusion, species differences in transgene DNA uptake in hepatocytes after adenoviral transfer correlate with the diameter of fenestrae.
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Abbreviations
- EDTA:
-
ethylenediamine tetra-acetic acid
- IPT:
-
intraportal transfer
- MVT:
-
marginal ear vein transfer
- NPC:
-
non-parenchymal liver cells
- NZW:
-
New Zealand White
- PC:
-
parenchymal liver cells
- s.e.m.:
-
standard error of the mean
- VEGF:
-
vascular endothelial growth factor.
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Acknowledgements
This work was supported by Grants G.0563.05 and G.0322.06 of the Fonds voor Wetenschappelijk Onderzoek-Vlaanderen. The Center for Molecular and Vascular Biology is supported by the Excellentiefinanciering KU Leuven (EF/05/013). Joke Lievens and Frank Jacobs are Research Assistants of the Instituut voor de Aanmoediging van Innovatie door Wetenschap en Technologie in Vlaanderen. We thank J Hendrix and Z Zhang for excellent technical assistance.
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Snoeys, J., Lievens, J., Wisse, E. et al. Species differences in transgene DNA uptake in hepatocytes after adenoviral transfer correlate with the size of endothelial fenestrae. Gene Ther 14, 604–612 (2007). https://doi.org/10.1038/sj.gt.3302899
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DOI: https://doi.org/10.1038/sj.gt.3302899
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