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. 1976 Apr;13(4):1273–1288. doi: 10.1128/iai.13.4.1273-1288.1976

Antigenic analysis of Neisseria gonorrhoeae by crossed immunoelectrophoresis.

C J Smyth, A E Friedman-Kien, M R Salton
PMCID: PMC420749  PMID: 819376

Abstract

Crossed immunoelectrophoresis was used to study two complex antigenic preparations from Neisseria gonorrhoeae, one of cytoplasmic origin and the other derived by Triton X-100 extraction of isolated washed gonococcal envelopes, with the aim of developing suitable reference antigen-antibody systems that could be subsequently used to investigate the immune response to gonococcal infection and to monitor envelope preparations for cytoplasmic contamination. A number of parameters were investigated to optimized and standardize antigen preparation, e.g., harvesting and washing of gonococci, methods of bacterial disruption, and washing of envelopes. The effects of Triton X-100 concentration, initial total envelope protein concentration, and the composition, pH, and concentration of buffer on cell envelope extractability were studied to obviate the need to concentrate material before use in crossed immunoelectrophoresis. The electroendoosmotic properties of agarose were a major determining factor in resolving envelope antigens. From 25 to 30 immunoprecipitates were revealed in the envelope antigen-antibody system; 75 to 80 were revealed in the cytoplasmic sytem. Envelope immunoprecipitates with reduced nicotinamide adenine dinucleotide and lactate dehydrogenase activities were identified. Crossed immunoelectrophoresis with intermediate gels revealed the presence of antibodies in a preimmune rabbit antiserum pool to a distinctive fact-moving component in both the envelope and cytoplasmic antigen preparations. The intermediate gel technique also demonstrated that extensive washing of envelope preparations with buffer did not remove cytoplasmic ontamination completely. The method provides a much more sensitive means of monitoring the purity of envelope fractions than the use of single enzy,e markers as indexes of such contamination. The use of rabbit antisera raised to formolized gonococci in intermediate gels indicated that both reference antigen-antibody systems were of potential use in screening immune responses to N. gonorrhoeae.

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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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