ELISA
The levels of IgG, IgM, and IgA in culture supernatants were measured with Human IgG/IgM/IgA Precoated ELISA Kit (1128162, 1128182, 1128172 DAKEWE, China) respectively. The level of IFNα in plasma from pSS patients and matched HCs was determined by Human IFN-α Precoated ELISA Kit (1110012, DAKEWE, China) following the manufacturer’s instructions.