Programming isotype specific plasma cell differentiation
Higgins, B. W.; Shuparski, A. G.; Miller, K. B.; Robinson, A. M.; McHeyzer-Williams, L. J.; McHeyzer-Williams, M. G.
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Antibodies are produced across multiple isotypes with distinct properties that coordinate initial antigen clearance and confer long-term antigen-specific immune protection. Here, we interrogate the molecular programs of isotype-specific murine plasma cells (PC) following helper T cell dependent immunization and within established steady-state immunity. Using integrated single cell strategies, we reveal conserved and divergent components of the rapid effector phase of antigen-specific IgM+ versus inflammation modulating programs dictated by IgG2a/b+ PC differentiation. During antibody affinity maturation, the germinal center (GC) cycle imparts separable programs for post-GC inhibitory IgG1+ and inflammatory IgG2a/b+ PC to direct long-term cellular function. In the steady-state, two subsets of IgM+ and separate IgG2b+ PC programs clearly segregate from splenic IgA+ PC programs that emphasize mucosal barrier protection. These diverse isotype-specific molecular pathways of PC differentiation control complementary modules of antigen clearance and immune protection that could be selectively targeted for immunotherapeutic applications and vaccine design.
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