JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Expression of HIV-1 broadly neutralizing antibodies mediated by recombinant adeno-associated virus 8 in vitro and in vivo.

Molecular Immunology 2016 December
Despite unremitting efforts since the discovery of human immunodeficiency virus type 1 (HIV-1), an effective vaccine has not been generated. Viral vector-mediated transfer for expression of HIV-1 broadly neutralizing antibodies (BnAbs) is an attractive strategy. In this study, a recombinant adeno-associated virus 8 (rAAV8) vector was used to encode full-length antibodies against HIV-1 in 293T cells and Balb/c mice after gene transfer. The 10E8 or NIH45-46 BnAb was expressed from a single open reading frame by linking the heavy and light chains with a furin cleavage and a 2A self-processing peptide (F2A). The results showed that the BnAbs could be expressed in the 293T cell culture medium. A single intramuscular injection of rAAV8 led to long-term expression of BnAbs in Balb/c mice. The expressed antibodies in the supernatant of 293T cells and in Balb/c mice showed neutralization effects against HIV-1 pseudoviruses. Combined immunization of rAAV8 expressing 10E8 and rAAV8 expressing NIH45-46 in Balb/c mice could increase these neutralization effects on strains of HIV-1 sensitive to 10E8 or NIH45-46 antibody compared with a single injection of rAAV8 expressing either antibody alone. Therefore, the combined immunization may be a potential vaccine approach against HIV-1.

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