Adenovirus capsid-display of the retro-oriented human complement inhibitor DAF reduces Ad vector-triggered immune responses in vitro and in vivo.
Adenovirus (Ad) vectors are widely used in human clinical trials. However, at higher dosages, Ad vector-triggered innate toxicities remain a major obstacle to many applications. Ad interactions with the complement system significantly contribute to innate immune responses in several models of Ad-mediated gene transfer. We constructed a novel class of Ad vectors, genetically engineered to "capsid-display" native and retro-oriented versions of the human complement inhibitor decay-accelerating factor (DAF), as a fusion protein from the C-terminus of the Ad capsid protein IX. In contrast to conventional Ad vectors, DAF-displaying Ads dramatically minimized complement activation in vitro and complement-dependent immune responses in vivo. DAF-displaying Ads did not trigger thrombocytopenia, minimized endothelial cell activation, and had diminished inductions of proinflammatory cytokine and chemokine responses. The retro-oriented display of DAF facilitated the greatest improvements in vivo, with diminished activation of innate immune cells, such as dendritic and natural killer cells. In conclusion, Ad vectors can capsid-display proteins in a manner that not only retains the functionality of the displayed proteins but also potentially can be harnessed to improve the efficacy of this important gene transfer platform for numerous gene transfer applications.
Seregin
Sergey S
SS
Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI 48823, USA.
Aldhamen
Yasser A
YA
Appledorn
Daniel M
DM
Hartman
Zachary C
ZC
Schuldt
Nathaniel J
NJ
Scott
Jeannine
J
Godbehere
Sarah
S
Jiang
Haixiang
H
Frank
Michael M
MM
Amalfitano
Andrea
A
D000256:Adenoviridae / Q000235:genetics*; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D018958:CD55 Antigens / Q000235:genetics*; D036022:Capsid Proteins / Q000235:genetics*; D003167:Complement Activation / Q000276:immunology; D003176:Complement C3 / Q000172:deficiency / Q000235:genetics / Q000276:immunology; D003713:Dendritic Cells / Q000276:immunology / Q000378:metabolism; D005434:Flow Cytometry; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007113:Immunity, Innate / Q000276:immunology; D018836:Inflammation Mediators / Q000276:immunology / Q000378:metabolism; D008099:Liver / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008969:Molecular Sequence Data; D011993:Recombinant Fusion Proteins / Q000235:genetics* / Q000276:immunology / Q000378:metabolism; D013601:T-Lymphocytes / Q000276:immunology / Q000378:metabolism
D018958:CD55 Antigens; D036022:Capsid Proteins; D003176:Complement C3; D018836:Inflammation Mediators; D011993:Recombinant Fusion Proteins; D049452:Green Fluorescent Proteins