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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1980 Mar;77(3):1622–1626. doi: 10.1073/pnas.77.3.1622

Specificity of human antibodies to oncovirus glycoproteins: recognition of antigen by natural antibodies directed against carbohydrate structures.

H W Snyder Jr, E Fleissner
PMCID: PMC348549  PMID: 6246496

Abstract

Antibodies in human sera from healthy individuals were shown to be reactive with highly purified 70,000-dalton envelope glycoprotein (gp70) of the simian sarcoma virus-simian sarcoma-associated virus (SSV-SSAV) complex in radioimmunoprecipitation assays under certain conditions. The specificity of the reaction was analyzed in absorption tests with normal human serum proteins, assays of viral gp70 antigenicity after exposure to exo- and endoglycosidases or trypsin, and carbohydrate hapten inhibition studies. On the basis of the results obtained in these experiments we have concluded that immune recognition of SSV-SSAV gp70 can be mediated by naturally occurring heterophil antibodies in human sera that are reactive by virtue of binding to the carbohydrate moiety of the viral gp70 molecules. The results are consistent with the idea that the antibodies in question are elicited as a result of exposure to many natural substances possessing widely crossreacting antigens and are not a result of widespread infection of man with replication-competent oncoviruses.

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Selected References

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