Effect of IVIg on the expression of costimulatory molecules of DCs implicated in Treg expansion. DCs were cultured in GM-CSF and IL-4 alone (Ctr) or with IVIg for 24 hours. (A) The expression of PD-L1, PD-L2, OX-40L, and ICOSL depicted as percent positive cells (mean ± SEM, n = 7-8) and (B) mean fluorescence intensity (MFI). The difference in expression levels of costimulatory molecules between Ctr and IVIg groups was not statistically significant.