High PD-L1/CD86 Ratio on Plasmacytoid Dendritic Cells Correlates With Elevated T-Regulatory Cells in Liver Transplant Tolerance

These novel findings suggest a possible functional relationship between the enhanced incidence of precursor plasmacytoid DC, their comparatively high relative expression of the coinhibitory molecule PD-L1, and the elevated frequency of Treg in operational liver transplant tolerance.