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Induction of broadly neutralizing antibodies (bnAbs) capable of inhibiting infection with diverse variants of human immunodeficiency virus type 1 (HIV-1) is a key, as-yet-unachieved goal of prophylactic HIV-1 vaccine strategies. However, some HIV-infected individuals develop bnAbs after approximately 2-4 years of infection, enabling analysis of features of these antibodies and the immunological environment that enables their induction. Distinct subsets of CD4+ T cells play opposing roles in the regulation of humoral responses: T follicular helper (Tfh) cells support germinal center formation and provide help for affinity maturation and the development of memory B cells and plasma cells, while regulatory CD4+ (Treg) cells including T follicular regulatory (Tfr) cells inhibit the germinal center reaction to limit autoantibody production. BnAbs exhibit high somatic mutation frequencies, long third heavy-chain complementarity determining regions, and/or autoreactivity, suggesting that bnAb generation is likely to be highly dependent on the activity of CD4+ Tfh cells, and may be constrained by host tolerance controls. This review discusses what is known about the immunological environment during HIV-1 infection, in particular alterations in CD4+ Tfh, Treg, and Tfr populations and autoantibody generation, and how this is related to bnAb development, and considers the implications for HIV-1 vaccine design.

Original publication

DOI

10.1111/imr.12504

Type

Journal article

Journal

Immunol Rev

Publication Date

01/2017

Volume

275

Pages

62 - 78

Keywords

CD4+ T follicular helper cell, CD4+ T follicular regulatory cell, autoantibody, broadly neutralizing antibody, human immunodeficiency virus, regulatory T cell, AIDS Vaccines, Animals, Antibodies, Neutralizing, B-Lymphocytes, Germinal Center, HIV Antibodies, HIV Infections, HIV-1, Humans, Immunity, Humoral, Immunologic Memory, T-Lymphocyte Subsets