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Biol Blood Marrow Transplant. 2014 Jan;20(1):128-32. doi: 10.1016/j.bbmt.2013.10.006. Epub 2013 Oct 15.

Reduced IL-7 responsiveness defined by signal transducer and activator of transcription 5 phosphorylation in T cells may be a marker for increased risk of developing cytomegalovirus disease in patients after hematopoietic stem cell transplantation.

Author information

1
Department of Medicine Huddinge, Section of Hematology, Karolinska Institutet, Stockholm, Sweden; Department of Pediatrics, Karolinska University Hospital, Stockholm, Sweden. Electronic address: lena.bercoff@gmail.com.
2
Department of Immunobiology, Yale University, New Haven, Connecticut.
3
Department of Pathology and Laboratory Medicine, Emory Vaccine Center, Emory University, Atlanta, Georgia.
4
Centrum för Allogen Stamcellstransplantation, Karolinska University Hospital, Stockholm, Sweden.
5
Centrum för Allogen Stamcellstransplantation, Karolinska University Hospital, Stockholm, Sweden; Division of Therapeutic Immunology, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden.
6
Department of Medicine Huddinge, Section of Hematology, Karolinska Institutet, Stockholm, Sweden; Division of Hematology, Karolinska University Hospital, Stockholm, Sweden.

Abstract

Cytomegalovirus (CMV) reactivation may lead to CMV disease associated with high morbidity and mortality in patients after hematopoietic stem cell transplantation (HSCT); the identification of clinically relevant markers may aid in the identification of patients at increased risk for developing CMV-associated complications. We evaluated the phosphorylation of signal transducer and activator of transcription 5 (STAT5) in CD4(+) T cells, CD8(+) T cells, and TCRγδ T cells in response to stimulation with IL-7 or IL-2 after HSCT by analyzing blood samples taken monthly 1 to 6 months after HSCT. Patients were monitored weekly with a quantitative PCR from the time of engraftment for CMV viral load in whole blood until at least day 100 after HSCT. We identified a correlation between clinical outcome regarding CMV replication and the ability to respond to IL-7 and IL-2 defined by STAT5 phosphorylation (pSTAT5). Patients with recurrent or prolonged CMV replications had significantly lower pSTAT5 upon stimulation of T cells with either IL-7 or IL-2 at time points 1 through 3 than those without CMV replication (P < .05). This was also found after stimulation of CD8(+) T cells at time point 2 (P < .05). We conclude that reduced responses to IL-7, reflected by pSTAT5, may represent a clinically relevant functional biomarker for individuals at increased risk for CMV reactivation; our data may also aid in designing better strategies to improve anti-CMV immune responses without increasing the risk of developing graft-versus-host disease.

KEYWORDS:

Cytomegalovirus; Graft-versus-host disease; HSCT; Interleukin-2; Interleukin-7; Signal transducer and activator of transcription 5 (STAT5)

PMID:
24140122
DOI:
10.1016/j.bbmt.2013.10.006
[Indexed for MEDLINE]
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