Inconsistent Responses of Cytomegalovirus-Specific T Cells to pp65 and IE-1 versus Infected Dendritic Cells in Organ Transplant Recipients

CD4and CD8T cells specific for human cytomegalovirus (HCMV) and two immunodominant HCMV antigens (pp65 and IE-1) were monitored in 20 solid organ transplant recipients undergoing primary (n 4) or reactivated (n 16) HCMV infection during the first year after transplantation by using as a stimulator either HCMV-infected autologous dendritic cells (DCs) or pp65- or IE-1 peptide mixtures. Turnaround times for test performance were 7 days for infected DCs and 24 h for peptides. Using infected DCs, HCMV-specific T-cell restoration occurred in all patients for CD8and in 1820 (90) for CD4T-cell subpopulations, resulting in virus clearance from blood. Using peptide mixtures, T-cell responses were less frequently detected. In detail, 14 (70) patients showed pp65-specific CD8T cells and 10 (50) patients IE-1-specific CD8T cells, whereas pp65-specific CD4T cells were detected in 14 (70) patients, and IE-1-specific CD4T cells in three (15) patients only. Protection from HCMV infection was associated with the presence of a HCMV-specific T-cell response directed against multiple viral proteins, but not against pp65 or IE-1 only. In conclusion, the use of pp65 and IE-1 peptide mixtures for rapid monitoring of HCMV-specific T-cell responses in solid organ transplant recipients underestimates the actual T-cell immune response against HCMV.