A T cell-dependent mechanism for the induction of human mucosal homing immunoglobulin A-secreting plasmablasts.

Immunity
Melissa DullaersSangkon Oh

Abstract

Mucosal immunoglobulin A (IgA) secreted by local plasma cells (PCs) is a critical component of mucosal immunity. Although IgA class switching can occur at mucosal sites, high-affinity PCs are optimally generated in germinal centers (GCs) in a T cell-dependent fashion. However, how CD4(+) helper T cells induce mucosal-homing IgA-PCs remains unclear. Here, we show that transforming growth factor beta1 (TGFbeta1) and interleukin 21 (IL-21), produced by follicular helper T cells (Tfh), synergized to generate abundant IgA-plasmablasts (PBs). In the presence of IL-21, TGFbeta1 promoted naive B cell proliferation and differentiation and overrode IL-21-induced IgG class switching in favor of IgA. Furthermore, TGFbeta1 and IL-21 downregulated CXCR5 while upregulating CCR10 on plasmablasts, enabling their exit from GCs and migration toward local mucosa. This was supported by the presence of CCR10(+)IgA(+)PBs in tonsil GCs. These findings show that Tfh contribute to mucosal IgA. Thus, mucosal vaccines should aim to induce robust Tfh responses.

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