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Decreased immune reactivity towards a knobless, affibody-targeted adenovirus type 5 vector
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2007 (English)In: Gene Therapy, ISSN 0969-7128, E-ISSN 1476-5462, Vol. 14, no 4, 376-381 p.Article in journal (Refereed) Published
Abstract [en]

In this study, a prototype Adenovirus type 5 (Ad5) vector deleted of the fiber knob domain and carrying an Affibody molecule as the targeting ligand showed decreased susceptibility to human pre-existing antibodies. This vector, Ad5/R7-Z(taq)Z(taq), has short fibers carrying seven shaft repeats, a non-native trimerization signal and an affibody molecule (Z(taq)) reactive to Taq polymerase. Ad5/R7-Z(taq)Z(taq) could be specifically targeted to 293 cells stably expressing membrane-bound anti-Z(taq) idiotypic affibody called Z(ztaq) (293Z(ztaq)). Sera from 50 blood donors were analyzed for neutralization activity (NA) against the parental Ad5/Fiwt vector and knobless Ad5/R7-Z(taq)Z(taq) on 293Z(ztaq) cells. Twenty-three sera had NA titers (>= 1:64) against Ad5/Fiwt (46%) and only two against Ad5/R7-Z(taq)Z(taq) (4%). Characterization of sera with NA titers showed that the knob domain is one of the targets of the antibodies. Neutralization assays using sera pre-adsorbed on knob and hexon proteins showed that the NA of the sera was carried mainly by anti-knob and anti-hexon antibodies, but in certain sera the anti-hexon antibodies represent the major population of the neutralizing antibodies (NAbs). Our results suggested that a combination of knob deletion and hexon switching could be an effective strategy for Ad vectors to better evade the anti-Ad NAbs.

Place, publisher, year, edition, pages
2007. Vol. 14, no 4, 376-381 p.
Keyword [en]
adenovirus, virus neutralization, neutralizing antibodies, hexon, fiber, penton base, knob, staphylococcal protein-a, neutralizing antibodies, recombinant adenovirus, virus, gene, humans, determinants, mechanism, libraries, receptor
URN: urn:nbn:se:kth:diva-16370DOI: 10.1038/ 000244031600010ScopusID: 2-s2.0-33846921294OAI: diva2:334412
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Nygren, Per-Åke
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