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. 1986 Jul;59(1):37–44. doi: 10.1128/jvi.59.1.37-44.1986

Neutralizing antibodies to visna lentivirus: mechanism of action and possible role in virus persistence.

S Kennedy-Stoskopf, O Narayan
PMCID: PMC253035  PMID: 3012120

Abstract

Lentiviruses are nononcogenic retroviruses that cause persistent infections and slowly progressive diseases. Visna virus, a lentivirus of sheep, persists in cells of the macrophage lineage despite the presence of neutralizing antibodies in the animal. These antibodies are measured by prevention of virus replication in sheep fibroblast cell cultures. In this study we have compared the antiviral properties of the antibodies in sheep fibroblast and macrophage cell cultures, the latter being more relevant to infection in the animal. Using infectivity assays, binding of radiolabeled virus to cell membranes, cellular processing of labeled virus into acid-precipitable and acid-soluble components, and in situ hybridization of viral nucleic acid, we show that the antibodies prevented virus replication in both fibroblasts and macrophages. However, the site of neutralization differed between the two cell types. In fibroblasts, the site of virus neutralization was at the cell membrane, when the antibodies prevented virus attachment. In macrophages, virus incubated with the antibodies was phagocytized rapidly, followed by uncoating of the virions. However, virus RNA was not transcribed. Despite this ability of the antibodies to abort virus replication in macrophages, the kinetics of binding of the antibodies to the virus was much slower than the binding of virus to the macrophages. Therefore, persistent virus replication in immune sheep may be the result of virus spreading from macrophage to macrophage before the agent can be neutralized by antibodies in the plasma.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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