Long-Term and Low-Level Envelope C2V3 Stimulation by Highly Diverse Virus Isolates Leads to Frequent Development of Broad and Elite Antibody Neutralization in HIV-1-Infected Individuals

Martin, Francisco; Marcelino, José Maria; Palladino, Claudia; Bártolo, Inês; Tracana, Susana; Moranguinho, Inês; Gonçalves, Paloma; Mateus, Rita; Calado, Rita; Borrego, Pedro; Leitner, Thomas; Clemente, Sofia; Taveira, Nuno

doi:10.1128/spectrum.01634-22

Long-Term and Low-Level Envelope C2V3 Stimulation by Highly Diverse Virus Isolates Leads to Frequent Development of Broad and Elite Antibody Neutralization in HIV-1-Infected Individuals

Journal Article · Tue Nov 29 00:00:00 EST 2022 · Microbiology Spectrum

DOI:https://doi.org/10.1128/spectrum.01634-22· OSTI ID:2470526

Martin, Francisco ^[1]; Marcelino, José Maria ^[2]; ^[1]; Bártolo, Inês ^[1]; Tracana, Susana ^[1]; Moranguinho, Inês ^[1]; Gonçalves, Paloma ^[1]; Mateus, Rita ^[1]; Calado, Rita ^[1]; Borrego, Pedro ^[1]; Leitner, Thomas ^[3]; Clemente, Sofia ^[4]; ^[2]

Univ. of Lisbon (Portugal)
Univ. of Lisbon (Portugal); Univ. of Egas Moniz, Caparica (Portugal)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Hospital da Divina Providência, Luanda (Angola)

A minority of HIV-1-infected patients produce broadly neutralizing antibodies (bNAbs). Identification of viral and host correlates of bNAb production may help develop vaccines. We aimed to characterize the neutralizing response and viral and host-associated factors in Angola, which has one of the oldest, most dynamic, and most diverse HIV-1 epidemics in the world. Three hundred twenty-two HIV-1-infected adults from Angola were included in this retrospective study. Phylogenetic analysis of C2V3C3 env gene sequences was used for virus subtyping. Env-binding antibody reactivity was tested against polypeptides comprising the C2, V3, and C3 regions. Neutralizing-antibody responses were determined against a reference panel of tier 2 Env pseudoviruses in TZM-bl cells; neutralizing epitope specificities were predicted using ClustVis. All subtypes were found, along with untypeable strains and recombinant forms. Notably, 56% of the patients developed cross neutralizing, broadly neutralizing, or elite neutralizing responses. Broad and elite neutralization was associated with longer infection time, subtype C, lower CD4⁺ T cell counts, higher age, and higher titer of C2V3C3-specific antibodies relative to failure to develop bNAbs. Neutralizing antibodies targeted the V3-glycan supersite in most patients. V3 and C3 regions were significantly less variable in elite neutralizers than in weak neutralizers and nonneutralizers, suggesting an active role of V3C3-directed bNAbs in controlling HIV-1 replication and diversification. In conclusion, prolonged and low-level envelope V3C3 stimulation by highly diverse and ancestral HIV-1 isolates promotes the frequent elicitation of bNAbs. These results provide important clues for the development of an effective HIV-1 vaccine. Studies on neutralization by antibodies and their determinants in HIV-1-infected individuals have mostly been conducted in relatively recent epidemics caused by subtype B and C viruses. Results have suggested that elicitation of broadly neutralizing antibodies (bNAbs) is uncommon. The mechanisms underlying the elicitation of bNAbs are still largely unknown. We performed the first characterization of the plasma neutralizing response in a cohort of HIV-1-infected patients from Angola. Angola is characterized by an old and dynamic epidemic caused by highly diverse HIV-1 variants. Remarkably, more than half of the patients produced bNAbs, mostly targeting the V3-glycan supersite in HIV-1. This was associated with higher age, longer infection time, lower CD4⁺ T cell counts, subtype C infection, or higher titer of C2V3C3-specific antibodies relative to patients that did not develop bNAbs. These results may help develop the next generation of vaccine candidates for HIV-1.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2470526

Journal Information:: Microbiology Spectrum, Journal Name: Microbiology Spectrum Journal Issue: 6 Vol. 10; ISSN 2165-0497

Publisher:: American Society for MicrobiologyCopyright Statement

Country of Publication:: United States

Language:: English

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