Abstract
Human CD46 (membrane cofactor protein), which serves as a receptor for a variety of pathogens, including strains of measles virus, human herpesvirus type 6 and Neisseria, is rapidly downregulated from the cell surface following infection by these pathogens. Here, we report that replication-incompetent adenovirus (Ad) serotype 35 (Ad35) vectors, which belong to subgroup B and recognize human CD46 as a receptor, downregulate CD46 following infection. A decline in the surface expression of CD46 in human peripheral blood mononuclear cells was detectable 6 h after infection, and reached maximum (72%) 12 h after infection. Ad35 vector-induced downregulation of surface CD46 levels gradually recovered after the removal of Ad35 vectors, however, complete recovery of CD46 expression was not observed even at 96 h after removal. The surface expression of CD46 was also reduced after incubation with fiber-substituted Ad serotype 5 (Ad5) vectors bearing Ad35 fiber proteins, ultraviolet-irradiated Ad35, vectors and recombinant Ad35 fiber knob proteins; in contrast, conventional Ad5 vectors did not induce surface CD46 downregulation, suggesting that the fiber knob protein of Ad35 plays a crucial role in the downregulation of surface CD46 density. These results have important implications for gene therapy using CD46-utilizing Ad vectors and for the pathogenesis of Ads that interact with CD46.
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Abbreviations
- Ad:
-
adenovirus
- APC:
-
allophycocyanin
- BSA:
-
bovine serum albumin
- CAR:
-
coxsackievirus and adenovirus receptor
- FBS:
-
fetal bovine serum
- FITC:
-
fluorescein isothiocyanate
- GAPDH:
-
glyceraldehyde-3-phosphate dehydrogenase
- GFP:
-
green fluorescence protein
- HHV6:
-
herpesvirus type 6
- MV:
-
measles virus
- MVH:
-
measles virus hemagglutinin
- MFI:
-
mean fluorescence intensity
- MOI:
-
multiplicity of infection
- PBMCs:
-
peripheral blood mononuclear cells
- PBS:
-
phosphate-buffered saline
- RT-PCR:
-
reverse transcriptase-polymerase chain reaction
- SCRs:
-
short consensus repeats
- VP:
-
vector particle
- PE:
-
phycoerythrin.
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Acknowledgements
We thank Ms Naoko Funakoshi, Ms Tomomi Sasaki and Ms Noriko Tada for their technical assistance. We also thank Dr Tsukasa Seya (Hokkaido University, Japan) for providing anti-CD46 rabbit serum. This work was supported by grants for Health and Labour Sciences Research from the Ministry of Health, Labour, and Welfare of Japan, and by Grants-in-Aid for Scientific Research on Priority Areas (B).
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Sakurai, F., Akitomo, K., Kawabata, K. et al. Downregulation of human CD46 by adenovirus serotype 35 vectors. Gene Ther 14, 912–919 (2007). https://doi.org/10.1038/sj.gt.3302946
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DOI: https://doi.org/10.1038/sj.gt.3302946
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