A: Serum IgA; serum IgA was determined by mouse IgA ELISA quantitation kit. Data were compared between WT control and Was-KO mice at different age groups.
B: In vitro IgA production; splenic B cells were isolated by immunomagnetic isolation kit and the cells were cultured in vitro in the presence of LPS and various cytokines. After 4 d, supernatant samples were harvested and IgA levels determined. Data were compared between WT control and Was-KO mice. Circulating IgA containing immune complexes were also determined by ELISA. Data were compared between WT and Was-KO mice and expressed as OD′ at 405 nm.
C: Serum circulating IgA-containing immune complex (IgA–C3)
D: Serum circulating IgA-containing immune complex (IgA–IgG)