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Nature protocols

In vivo antigen-driven plasmablast enrichment in combination with antigen-specific cell sorting to facilitate the isolation of rare monoclonal antibodies from human B cells.


PMID 24901740

Abstract

The ability to rapidly generate large panels of antigen-specific human antibodies in a rodent would enable the efficient discovery of novel therapeutically useful antibodies. We have developed a system wherein human antigen-specific antibody-secreting plasmablasts can be enriched in vivo, in a severe combined immunodeficient (SCID)/beige mouse host. The antigen-specific plasmablasts can then be sorted by flow cytometry, enabling single-cell cloning and expression of fully human immunoglobulin-G. By using this technique, we have generated four broadly reactive anti-influenza A antibodies. Therefore, the method described here is useful for the identification of rare functional antibodies. This protocol takes ∼1 month to complete, from the time of human vaccination to the cloning of heavy- and light-chain genes. For additional small-scale transient expression, purification and binding analysis, the protocol would take an additional month.

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