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. 1988 Oct;56(10):2581–2586. doi: 10.1128/iai.56.10.2581-2586.1988

Determination of bovine lymphocyte responses to extracted proteins of Brucella abortus by using protein immunoblotting.

B Brooks-Alder 1, G A Splitter 1
PMCID: PMC259615  PMID: 3138178

Abstract

Isolation and identification of Brucella antigenic determinants important to cellular responses have been difficult. In this study, bovine peripheral blood mononuclear (PBM) cells from cattle vaccinated with Brucella abortus 19 proliferated to extracted bacterial proteins blotted onto nitrocellulose. Proteins were extracted from gamma-irradiated B. abortus 19 with a sodium dodecyl sulfate extraction buffer. The extracted proteins were separated electrophoretically by sodium dodecyl sulfate-polyacrylamide gel electrophoresis prior to electroblotting onto nitrocellulose. Nitrocellulose sections corresponding to individual lanes of the gel (containing all separated proteins) were then cultured with the PBM cells. Primary and secondary stimulation responses of the PBM cells with the whole protein blots were similar kinetically to the responses of the PBM cells stimulated with whole irradiated B. abortus 19 or with whole irradiated B. abortus 19 blotted onto nitrocellulose. Although lipopolysaccharide was determined to be associated with the extracted proteins and transferred onto the blots, the lipopolysaccharide did not stimulate cellular proliferation, as indicated by the antigen-specific secondary responses. Stimulating PBM cells with portions of the blot containing high (greater than 45,000)-, medium (25,000 to 45,000)- or low (25,000)-molecular-weight proteins demonstrated that the responding cells were specific only to the proteins of corresponding molecular weights. These results indicate that cellular responses to individual proteins can be studied without cloning the bacterial genes or purifying the individual proteins.

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Selected References

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