Low-dose in vivo protection and neutralization across SARS-CoV-2 variants by monoclonal antibody combinations

Nat Immunol. 2021 Dec;22(12):1503-1514. doi: 10.1038/s41590-021-01068-z. Epub 2021 Oct 29.

Abstract

Prevention of viral escape and increased coverage against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern require therapeutic monoclonal antibodies (mAbs) targeting multiple sites of vulnerability on the coronavirus spike glycoprotein. Here we identify several potent neutralizing antibodies directed against either the N-terminal domain (NTD) or the receptor-binding domain (RBD) of the spike protein. Administered in combinations, these mAbs provided low-dose protection against SARS-CoV-2 infection in the K18-human angiotensin-converting enzyme 2 mouse model, using both neutralization and Fc effector antibody functions. The RBD mAb WRAIR-2125, which targets residue F486 through a unique heavy-chain and light-chain pairing, demonstrated potent neutralizing activity against all major SARS-CoV-2 variants of concern. In combination with NTD and other RBD mAbs, WRAIR-2125 also prevented viral escape. These data demonstrate that NTD/RBD mAb combinations confer potent protection, likely leveraging complementary mechanisms of viral inactivation and clearance.

Publication types

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

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Antibodies, Monoclonal / administration & dosage
  • Antibodies, Monoclonal / immunology*
  • Antibodies, Monoclonal / metabolism
  • Antibodies, Neutralizing / chemistry
  • Antibodies, Neutralizing / immunology*
  • Antibodies, Neutralizing / metabolism
  • Antibodies, Viral / immunology
  • Antibodies, Viral / metabolism
  • Binding Sites / genetics
  • COVID-19 / immunology*
  • COVID-19 / metabolism
  • COVID-19 / prevention & control
  • Disease Models, Animal
  • Dose-Response Relationship, Drug
  • Epitope Mapping
  • Epitopes / chemistry
  • Epitopes / immunology
  • Epitopes / metabolism
  • Humans
  • Mice, Transgenic
  • Neutralization Tests
  • Protein Binding
  • Protein Conformation
  • SARS-CoV-2 / genetics
  • SARS-CoV-2 / immunology*
  • SARS-CoV-2 / metabolism
  • Sequence Homology, Amino Acid
  • Spike Glycoprotein, Coronavirus / genetics
  • Spike Glycoprotein, Coronavirus / immunology*
  • Spike Glycoprotein, Coronavirus / metabolism
  • Survival Analysis

Substances

  • Antibodies, Monoclonal
  • Antibodies, Neutralizing
  • Antibodies, Viral
  • Epitopes
  • Spike Glycoprotein, Coronavirus

Supplementary concepts

  • SARS-CoV-2 variants