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Adjuvants influence the maturation of VRC01-like antibodies during immunization

Knudsen, M.L.; Agrawal, P.; MacCamy, A.; Parks, K.R.; Gray, M.D.; Takushi, B.N.; Khechaduri, A.; Salladay, K.R.; Coler, R.N.; LaBranche, C.C.; Montefiori, D.; Stamatatos, L.

Iscience 25(11): 105473

2022

ISSN/ISBN: 2589-0042
PMID: 36405776
Accession: 080671999

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Summary
Once naive B cells expressing germline VRC01-class B cell receptors become activated by germline-targeting immunogens, they enter germinal centers and undergo affinity maturation. Booster immunizations with heterologous Envs are required for the full maturation of VRC01-class antibodies. Here, we examined whether and how three adjuvants, Poly(I:C), GLA-LSQ, or Rehydragel, that activate different pathways of the innate immune system, influence the rate and type of somatic mutations accumulated by VRC01-class BCRs that become activated by the germline-targeting 426c.Mod.Core immunogen and the heterologous HxB2.WT.Core booster immunogen. We report that although the adjuvant used had no influence on the durability of plasma antibody responses after the prime, it influenced the plasma VRC01 antibody titers after the boost and the accumulation of somatic mutations on the elicited VRC01 antibodies.

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