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. 1983 Dec;48(3):697–708. doi: 10.1128/jvi.48.3.697-708.1983

Cell receptors for baboon endogenous virus recognized by monoclonal antibodies.

L Thiry, J Cogniaux-LeClerc, R Olislager, S Sprecher-Goldberger, P Buekens
PMCID: PMC255402  PMID: 6415296

Abstract

Hybridomas from mice immunized with baboon endogenous virus (BaEV) from A204(M7) cells produced several antiviral monoclonal antibodies and, in addition, antibodies D-12 and E-4, which appeared to be virus specific because they reacted with BaEV but not with Mason-Pfizer virus or RD-114 virus. However, they also bound to human virus-free cells, and they did not recognize BaEV from bat or canine host cells. Cell membrane targets for these antibodies comigrated with an 18,000-dalton protein, which may contain specific determinants of BaEV receptors since antibody masking of these cell sites prevented BaEV but not Mason-Pfizer virus or RD-114 virus adsorption. However, RD-114 virus interfered with BaEV adsorption. Thus, the two viral receptors must be adjacent, but the antibody D-12 and E-4 targets are not within the active site of RD-114 virus receptor. Conversely, cell coating with BaEV from bat or canine hosts inhibited antibody D-12 binding. Noncultivated human lymphocytes and cells from fetal organs bound much less antibody D-12 than did cells from established cell lines, with a correlation between amounts of antibody D-12 acceptor sites and BaEV receptors. Thus, in vivo, BaEV infection of human cells may be inefficient. In vitro, antibody D-12 treatment of chronically infected A204(M7) cells caused intracellular accumulation of viral proteins and decreased virus release, with no such effect on RD-114 virus-producing cells. Canine cells bound antibody D-12 only if coated with BaEV from A204(M7) cells, indicating that the human determinant coadsorbed with the virions to animal cells. Possibly, determinants of cell receptors participate in BaEV maturation and become associated with the virions.

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Selected References

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