Aggregate complexes of HIV-1 induced by multimeric antibodies

Daniel J. Stieh, Deborah F. King, Katja Klein, Pinghuang Liu, Xiaoying Shen, Kwan K. Hwang, Guido Ferrari, David C. Montefiori, Barton Haynes, Punnee Pitisuttithum, Jaranit Kaewkungwal, Sorachai Nitayaphan, Supachai Rerks-Ngarm, Nelson L. Michael, Merlin L. Robb, Jerome H. Kim, Thomas N. Denny, Georgia D. Tomaras, Robin J. Shattock*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Background: Antibody mediated viral aggregation may impede viral transfer across mucosal surfaces by hindering viral movement in mucus, preventing transcytosis, or reducing inter-cellular penetration of epithelia thereby limiting access to susceptible mucosal CD4 T cells and dendritic cells. These functions may work together to provide effective immune exclusion of virus from mucosal tissue; however little is known about the antibody characteristics required to induce HIV aggregation. Such knowledge may be critical to the design of successful immunization strategies to facilitate viral immune exclusion at the mucosal portals of entry.Results: The potential of neutralizing and non-neutralizing IgG and IgA monoclonals (mAbs) to induce HIV-1 aggregation was assessed by Dynamic light scattering (DLS). Although neutralizing and non-neutralizing IgG mAbs and polyclonal HIV-Ig efficiently aggregated soluble Env trimers, they were not capable of forming viral aggregates. In contrast, dimeric (but not monomeric) IgA mAbs induced stable viral aggregate populations that could be separated from uncomplexed virions. Epitope specificity influenced both the degree of aggregation and formation of higher order complexes by dIgA. IgA purified from serum of uninfected RV144 vaccine trial responders were able to efficiently opsonize viral particles in the absence of significant aggregation, reflective of monomeric IgA.Conclusions: These results collectively demonstrate that dIgA is capable of forming stable viral aggregates providing a plausible basis for testing the effectiveness of aggregation as a potential protection mechanism at the mucosal portals of viral entry.

Original languageEnglish
Article number78
JournalRetrovirology
Volume11
Issue number1
DOIs
StatePublished - 2 Oct 2014
Externally publishedYes

Keywords

  • Aggregation
  • HIV-1
  • Immunoglobulin A
  • Mucosal immunity

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