* IgG recycling also occurs in other cell types (eg, monocytes); only endothelial cells shown for illustration.
The neonatal Fc receptor (FcRn) is known to extend half-life and availability of pathogenic IgG antibodies.
FcRn has been shown to bind IgGs and rescue them from lysosomal degradation, extending IgG half-life (~21 days) compared to IgM or IgA (~5 days), not recycled by FcRn3-5.
Prolonged half-life of pathogenic IgGs has been shown to increase their ability to impair the neuromuscular transmission6.