Abstract
B cell ELISpot enables a sensitive analysis of antigen-specific B cells at the single cell level but is limited to the analysis of reactivity with a single antigen. By reversing the B cell ELISpot and using anti-IgG capture antibodies instead of coated antigen, the specificity of antibodies secreted by B cells can be defined using soluble tagged antigen for detection. When combining this approach with fluorescent detection of the antigen in a B cell FluoroSpot assay, reactivity with multiple antigens can be defined. In the protocol described herein, splenocytes from a mouse immunized with an antigen were analyzed for their reactivity with the antigen used for immunization and for cross-reactivity with a different but structurally related antigen. Using this assay, we found that at least 15% of the B cells displayed detectable cross-reactivity. B cell FluoroSpot utilizing multiple antigens provides a tool for a single-cell analysis of B cell cross-reactivity, for example, with variable and polymorphic antigens found in various pathogens; or analysis of other types of immune responses where analysis of cross-reactivity is of interest. It is also possible to simultaneously analyze B cell reactivity to completely different antigens.
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Acknowledgment
The authors would like to thank Kajsa Prokopec, Bernt Axelsson, and Gun Kesa for critical reading of the manuscript. Peter Jahnmatz is a graduate student financed by The Swedish Foundation for Strategic Research (ID14-0070) and Mabtech.
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Jahnmatz, P., Ahlborg, N. (2018). Detection of Cross-Reactive B Cells Using the FluoroSpot Assay. In: Kalyuzhny, A. (eds) Handbook of ELISPOT . Methods in Molecular Biology, vol 1808. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-8567-8_6
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DOI: https://doi.org/10.1007/978-1-4939-8567-8_6
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