Germline-Encoded Affinity for Cognate Antigen Enables Vaccine Amplification of a Human Broadly Neutralizing Response against Influenza Virus

Immunity. 2019 Oct 15;51(4):735-749.e8. doi: 10.1016/j.immuni.2019.09.001. Epub 2019 Sep 25.

Abstract

Antibody paratopes are formed by hypervariable complementarity-determining regions (CDRH3s) and variable gene-encoded CDRs. The latter show biased usage in human broadly neutralizing antibodies (bnAbs) against both HIV and influenza virus, suggesting the existence of gene-endowed targeting solutions that may be amenable to pathway amplification. To test this, we generated transgenic mice with human CDRH3 diversity but simultaneously constrained to individual user-defined human immunoglobulin variable heavy-chain (VH) genes, including IGHV1-69, which shows biased usage in human bnAbs targeting the hemagglutinin stalk of group 1 influenza A viruses. Sequential immunization with a stalk-only hemagglutinin nanoparticle elicited group 1 bnAbs, but only in IGHV1-69 mice. This VH-endowed response required minimal affinity maturation, was elicited alongside pre-existing influenza immunity, and when IGHV1-69 B cells were diluted to match the frequency measured in humans. These results indicate that the human repertoire could, in principle, support germline-encoded bnAb elicitation using a single recombinant hemagglutinin immunogen.

Keywords: BCR; conserved site of vulnerability; influenza; innate-like; rational vaccine; universal.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Antibodies, Viral / genetics
  • Antibodies, Viral / metabolism*
  • Antibody Affinity
  • B-Lymphocytes / immunology*
  • Broadly Neutralizing Antibodies / genetics
  • Broadly Neutralizing Antibodies / metabolism*
  • Complementarity Determining Regions / genetics
  • Germ-Line Mutation / genetics
  • Hemagglutinin Glycoproteins, Influenza Virus / immunology
  • Humans
  • Immunity, Humoral
  • Immunization, Secondary
  • Immunoglobulin Heavy Chains / genetics
  • Influenza A virus / physiology*
  • Influenza Vaccines / immunology*
  • Influenza, Human / immunology*
  • Mice
  • Mice, Transgenic
  • Nanoparticles
  • Protein Engineering
  • Receptors, Antigen, B-Cell / genetics*

Substances

  • Antibodies, Viral
  • Broadly Neutralizing Antibodies
  • Complementarity Determining Regions
  • Hemagglutinin Glycoproteins, Influenza Virus
  • Immunoglobulin Heavy Chains
  • Influenza Vaccines
  • Receptors, Antigen, B-Cell
  • hemagglutinin, human influenza A virus