Enhancing the sweeping of small immune complexes
The expression of FcγRIIb on LSEC and its action in the “sweeping” or removal of small immune complexes has opened up new possibilities for the application of FcγRIIb‐enhancing modifications.17 Antibodies or Fc fusion proteins, whose primary MOA is the neutralization of soluble molecules such as IgE or cytokines, are particularly attractive candidates for this approach. Proof‐of‐concept for this strategy has been demonstrated in experimental models.48 Indeed, this may be a significant component of the rapid disappearance of IgE from the circulation of patients treated with the anti‐IgE XmAb7195 containing the FcγRIIb enhancing “SELF” modifications, as described previously.