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. 1992 Jun;60(6):2459–2464. doi: 10.1128/iai.60.6.2459-2464.1992

Antigens of Brucella abortus S19 immunodominant for bovine lymphocytes as identified by one- and two-dimensional cellular immunoblotting.

B M Brooks-Worrell 1, G A Splitter 1
PMCID: PMC257181  PMID: 1587614

Abstract

Cellular immune responses are influential for protection against intracellular bacteria such as brucellae. Therefore, identification of Brucella abortus antigens that activate primed bovine lymphocytes is fundamental for discerning the breadth of cellular response in bovine brucellosis. Potentially antigenic components of B. abortus S19 were isolated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis followed by nitrocellulose blotting. Specific one-dimensional blot segments induced proliferation of peripheral blood lymphocytes from all 25 of the vaccinated cattle tested and were defined as immunodominant. Individual proteins that stimulated lymphocyte proliferation were further characterized by two-dimensional cellular immunoblotting by two different approaches. Individual one-dimensional stimulatory blot segments were eluted, concentrated, and then subjected to two-dimensional cellular immunoblotting. Alternatively, entire two-dimensional gels containing all of the B. abortus components were blotted and nitrocellulose sections containing individual proteins were assayed for lymphocyte activation. Thirty-eight Brucella proteins that induced lymphocyte proliferation were resolved by both procedures. Phenotypic analysis of the proliferating cell population demonstrated the presence of CD4+, CD8+, and immunoglobulin M+ lymphocytes. Two immunogenic proteins, 12 and 31 kDa, identified by two-dimensional cellular immunoblotting, were subjected to partial N-terminal amino acid analysis. The 12-kDa protein was within the area of greatest lymphocyte proliferation, while the 31-kDa protein was chosen for comparison with a 31-kDa protein previously reported by others. A search of the National Biomedical Research Foundation protein data bank showed that the sequences were not homologous with other known proteins. Identification of Brucella proteins immunogenic for bovine lymphocytes provides an important step in distinguishing the various proteins involved in pathogenicity and/or disease resistance.

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Selected References

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