Induction of HIV-1 broad neutralizing antibodies in 2F5 knock-in mice: selection against membrane proximal external region-associated autoreactivity limits T-dependent responses.
Induction of HIV-1 broad neutralizing antibodies in 2F5 knock-in mice: selection against membrane proximal external region-associated autoreactivity limits T-dependent responses.
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DOI:
10.4049/jimmunol.1300971
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发表时间:
2013-09-01
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影响因子:
--
通讯作者:
Haynes BF
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文献类型:
--
作者:
Verkoczy L;Chen Y;Zhang J;Bouton-Verville H;Newman A;Lockwood B;Scearce RM;Montefiori DC;Dennison SM;Xia SM;Hwang KK;Liao HX;Alam SM;Haynes BF
A goal of HIV-1 vaccine development is to elicit broadly neutralizing antibodies (BnAbs). Using a knock-in (KI) model of 2F5, a human HIV-1 gp41 MPER-specific BnAb, we previously demonstrated that a key obstacle to BnAb induction is clonal deletion of BnAb-expressing B-cells. Here, in this model, we provide a proof-of-principle that robust serum neutralizing IgG responses can be induced from pre-existing, residual self-reactive BnAb-expressing B-cells in vivo, using a structurally compatible gp41 MPER immunogen. Furthermore, in CD40L-deficient 2F5 KI mice, we demonstrate that these BnAb responses are elicited via a type II T-independent pathway, coinciding with expansion and activation of transitional splenic B-cells specific for 2F5's nominal gp41 MPER-binding epitope (containing the 2F5 neutralization domain ELDKWA). In contrast, constitutive production of non-neutralizing serum IgGs in 2F5 KI mice is T-dependent, and originates from a subset of splenic mature B2-cells that have lost their ability to bind 2F5's gp41 MPER epitope. These results suggest that residual, mature B-cells expressing autoreactive BnAbs like 2F5 as BCR, may be limited in their ability to participate in T-dependent responses, by purifying selection that selectively eliminates reactivity for neutralization epitope-containing/mimicked host antigens.
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