Abstract:
:During mouse cytomegalovirus (CMV) infection, a population of Ly49H(+) natural killer (NK) cells expands and is responsible for disease clearance through the induction of a "memory NK-cell response." Whether similar events occur in human CMV infection is unknown. In the present study, we characterized the kinetics of the NK-cell response to CMV reactivation in human recipients after hematopoietic cell transplantation. During acute infection, NKG2C(+) NK cells expanded and were potent producers of IFNγ. NKG2C(+) NK cells predominately expressed killer cell immunoglobulin-like receptor, and self-killer cell immunoglobulin-like receptors were required for robust IFNγ production. During the first year after transplantation, CMV reactivation induced a more mature phenotype characterized by an increase in CD56(dim) NK cells. Strikingly, increased frequencies of NKG2C(+) NK cells persisted and continued to increase in recipients who reactivated CMV, whereas these cells remained at low frequency in recipients without CMV reactivation. Persisting NKG2C(+) NK cells lacked NKG2A, expressed CD158b, preferentially acquired CD57, and were potent producers of IFNγ during the first year after transplantation. Recipients who reactivated CMV also expressed higher amounts of IFNγ, T-bet, and IL-15Rα mRNA transcripts. Our findings support the emerging concept that CMV-induced innate memory-cell populations may contribute to malignant disease relapse protection and infectious disease control long after transplantation.
journal_name
Bloodjournal_title
Bloodauthors
Foley B,Cooley S,Verneris MR,Pitt M,Curtsinger J,Luo X,Lopez-Vergès S,Lanier LL,Weisdorf D,Miller JSdoi
10.1182/blood-2011-10-386995subject
Has Abstractpub_date
2012-03-15 00:00:00pages
2665-74issue
11eissn
0006-4971issn
1528-0020pii
blood-2011-10-386995journal_volume
119pub_type
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