Figure 5: Modulation of complement-driven inflammation through FcgRIIB and dectin-1. Highly galactosylation IgG1 immune complexes bind to FcgRIIB. Galactosylation links FcgRIIB to dectin-1 resulting in tyrosine phosphorylation of the ITAM-like motif downstream of dectin-1 and transient phosphorylation of Syk. This pathway inhibits C5a-mediated ERK1/2 phosphorylation and several cellular effector functions of C5aR.