title: A prospective longitudinal analysis of cytomegalovirus (CMV)-specific CD4+ and CD8+ T cells in kidney allograft recipients at risk of CMV infection.
abstract: Cytomegalovirus (CMV)-specific cellular immunity is essential in controlling CMV infection after transplantation. We investigated whether CMV-specific T cell levels predict CMV DNAemia after kidney transplantation. Using cytokine-flow cytometry, we enumerated interferon-gamma producing CMV-specific CD4+ and CD8+ T cells at serial time points among CMV-mismatched (D+/R-) and seropositive (R+) kidney recipients who received 3 months of valganciclovir prophylaxis. Among 44 patients, eight (18%) developed CMV DNAemia at a mean (+ or - SD) time of 151 (+ or - 33) days after transplantation, including two (5%) with CMV syndrome and three (7%) with tissue-invasive CMV disease. Cox proportional hazards regression analysis showed that CMV mismatch (D+/R-) status (HR: 13, 95% CI: 1.6-106.4; P = 0.02) and diabetes mellitus (HR: 5.6; 95%CI: 1.1-27.9; P = 0.03) were significantly associated with CMV DNAemia. In contrast, the percentage or change-over-time in CMV-specific CD4+ [pp65 (P = 0.45), or CMV lysate (P = 0.22)] and CD8+ [pp65 (P = 0.43), or IE-1 (P = 0.37)] T cells were not significantly associated with CMV DNAemia. CMV-specific T cell assays have limited clinical utility among CMV R+ kidney recipients who received valganciclovir prophylaxis. On the other hand, the clinical utility of CMV-specific T cell assays will need to be assessed in a larger cohort of CMV D+/R- kidney recipients who remain at high-risk of delayed-onset CMV disease.
authors: Divisions of Infectious Diseases, Department of Medicine, College of Medicine, Mayo Clinic, Rochester, MN, USA.
authors: Albert J
authors: AJ
authors: Eid
authors: Robert A
authors: RA
authors: Brown
authors: Supha K
authors: SK
authors: Arthurs
authors: Brian D
authors: BD
authors: Lahr
authors: Jeanette E
authors: JE
authors: Eckel-Passow
authors: Timothy S
authors: TS
authors: Larson
authors: Raymund R
authors: RR
authors: Razonable
mesh_terms: D000368:Aged; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D016207:Cytokines / Q000378:metabolism; D003587:Cytomegalovirus / Q000378:metabolism*; D003586:Cytomegalovirus Infections / Q000175:diagnosis*; D005260:Female; D005434:Flow Cytometry / Q000379:methods; D006801:Humans; D007668:Kidney / Q000821:virology; D016030:Kidney Transplantation / Q000009:adverse effects* / Q000379:methods*; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D016016:Proportional Hazards Models; D011446:Prospective Studies; D012044:Regression Analysis
chemical_list: D016207:Cytokines