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T cells expand after solid organ transplantation in the absence of CMV disease.
T cells expand after solid organ transplantation in the absence of CMV disease. American journal of transplantation Higdon, L. E., Trofe-Clark, J., Liu, S., Margulies, K. B., Sahoo, M. K., Blumberg, E., Pinsky, B. A., Maltzman, J. S. 2017Abstract
Cytomegalovirus (CMV) is a major cause of morbidity and mortality in solid-organ transplant recipients. Approximately 60% of adults are CMV seropositive indicating previous exposure. Following resolution of primary infection, CMV remains in a latent state. Reactivation is controlled by memory T cells in healthy individuals; transplant recipients have reduced memory T cell function due to chronic immunosuppressive therapies. In this study, CD8(+) T cell responses to CMV polypeptides IE-1 and pp65 were analyzed in sixteen CMV seropositive renal and cardiac transplant recipients longitudinally pre- and post-transplant. All patients received standard of care maintenance immunosuppression, antiviral prophylaxis and CMV viral load monitoring, with approximately half receiving T cell depleting induction therapy. The frequency of CMV-responsive CD8(+) T cells, defined by production of effector molecules in response to CMV peptides, increased during the course of a year post-transplant. The increase commenced after the completion of antiviral prophylaxis, and these T cells tended to be terminally differentiated effector cells. Based on this small cohort, these data suggest that even in the absence of disease, antigenic exposure may continually shape the CMV-responsive T cell population post-transplant. This article is protected by copyright. All rights reserved.
View details for DOI 10.1111/ajt.14227
View details for PubMedID 28199780