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. 1973 Jul;8(1):19–24. doi: 10.1128/iai.8.1.19-24.1973

Type-Specific Inhibition of Preopsonization Versus Immunoprecipitation by Streptococcal M Proteins

Edwin H Beachey 1, Madeleine Cunningham 1
PMCID: PMC422803  PMID: 4124154

Abstract

Purified M protein of group A streptococci inhibits in vitro phagocytosis of bacteria nonspecifically when it is mixed directly with the test blood. We devised a method of preopsonization inhibition that avoids direct contact between the test blood and the opsonic inhibitory agent. Each of the M proteins tested by this method inhibited opsonization and phagocytosis of only homologous-type streptococci. Titration of the M antigen in various purified preparations demonstrated a clear dissociation between titers of type-specific precipitating M antigen and type-specific opsonic inhibitory M antigen. Since opsonization reflects protective antibody, assays of M protein based on reaction with opsonic antibody should reflect more accurately the presence of the type-specific M determinant involved in protective immunity against streptococcal infections.

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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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