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Anti-immune complex antibodies are elicited during repeated immunization with HIV Env immunogens.

Sci Immunol

January 2025

Department of Integrative, Structural and Computational Biology, Scripps Research, La Jolla, CA, USA.

Vaccination strategies against HIV-1 aim to elicit broadly neutralizing antibodies (bnAbs) using prime-boost regimens with HIV envelope (Env) immunogens. Epitope mapping has shown that early antibody responses are directed to easily accessible nonneutralizing epitopes on Env instead of bnAb epitopes. Autologously neutralizing antibody responses appear upon boosting, once immunodominant epitopes are saturated.

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Background: Vertical HIV-1 transmission despite antiretroviral therapy may be mitigated by use of long-acting, broadly neutralizing, monoclonal antibodies (bNAb) such as VRC07523LS. The present study was designed to determine the safety and pharmacokinetics of VRC07523LS.

Methods: VRC07523LS, 80 mg/dose, was administered subcutaneously after birth to non-breastfed (Cohort 1; N=11, enrolled in USA) and breastfed (Cohort 2; N=11, enrolled in South Africa and Zimbabwe) infants exposed to HIV-1.

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The Antibody Mediated Prevention (AMP) trials showed that passively infused VRC01, a broadly neutralizing antibody (bNAb) targeting the CD4 binding site (CD4bs) on the HIV-1 envelope protein (Env), protected against neutralization-sensitive viruses. We identified six individuals from the VRC01 treatment arm with multi-lineage breakthrough HIV-1 infections from HVTN703, where one variant was sensitive to VRC01 (IC < 25 ug/mL) but another was resistant. By comparing Env sequences of resistant and sensitive clones from each participant, we identified sites predicted to affect VRC01 neutralization and assessed the effect of their reversion in the VRC01-resistant clone on neutralization sensitivity.

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Impact of SARS-CoV-2 inactivated vaccine on symptoms following omicron variant breakthrough infection.

Vaccine

January 2025

Department of Microbiology and Infectious Disease Center, School of Basic Medical Sciences, Peking University, Beijing 100191, China.. Electronic address:

The SARS-CoV-2 Omicron variant and its sublineages continue to circulate widely. Clinical outcomes with this variant differ among individuals, primarily influenced by host immunity. Previous studies have explored the relationship between immune responses and severe diseases in infected or convalescent patients.

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