Fig. 6

Schematic diagram of TSLP in the initiation of IgG4-RD. Unknown triggers promote epithelial cells or fibroblasts to release TSLP. TSLP binds to the receptors TSLPR and IL7Ra on B cells, activating JAK-STAT signaling pathway and encouraging the proliferation and IgG4 antibody secretion of B cells. Activated B cells upregulated the expression of OX40L and enhance the differentiation of Tfh cells