4.6 Article

Poorly Neutralizing Cross-Reactive Antibodies against the Fusion Loop of West Nile Virus Envelope Protein Protect In Vivo via Fcγ Receptor and Complement-Dependent Effector Mechanisms

Journal

JOURNAL OF VIROLOGY
Volume 85, Issue 22, Pages 11567-11580

Publisher

AMER SOC MICROBIOLOGY
DOI: 10.1128/JVI.05859-11

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Funding

  1. NIH [U01 AI061373, R01-AI077955]
  2. Midwest Regional Center of Excellence for Biodefense and Emerging Infectious Diseases Research [U54 AI057160]
  3. NIAID
  4. [HHSN272201D000401/HHSN27200004/D04]

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The human antibody response to flavivirus infection is dominantly directed against a cross-reactive epitope on the fusion loop of domain II (DII-FL) of the envelope (E) protein. Although antibodies against this epitope fail to recognize fully mature West Nile virus (WNV) virions and accordingly neutralize infection poorly in vitro, their functional properties in vivo remain less well understood. Here, we show that while passive transfer of poorly neutralizing monoclonal antibodies (MAb) and polyclonal antibodies against the DII-FL epitope protect against lethal WNV infection in wild-type mice, they fail to protect mice lacking activating Fc gamma receptors (Fc gamma R) and the complement opsonin C1q. Consistent with this, an aglycosyl chimeric mouse-human DII-FL MAb (E28) variant that lacks the ability to engage Fc gamma R and C1q also did not protect against WNV infection in wild-type mice. Using a series of immunodeficient mice and antibody depletions of individual immune cell populations, we demonstrate that the nonneutralizing DII-FL MAb E28 does not require T, B, or NK cells, inflammatory monocytes, or neutrophils for protection. Rather, E28 treatment decreased viral load in the serum early in the course of infection, which resulted in blunted dissemination to the brain, an effect that required phagocytic cells, C1q, and Fc gamma RIII (CD16). Overall, these studies enhance our understanding of the functional significance of immunodominant, poorly neutralizing antibodies in the polyclonal human antiflavivirus response and highlight the limitations of current in vitro surrogate markers of protection, such as cell-based neutralization assays, which cannot account for the beneficial effects conferred by these antibodies.

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