Journal
CLINICAL AND LABORATORY HAEMATOLOGY
Volume 28, Issue 6, Pages 382-390Publisher
WILEY
DOI: 10.1111/j.1365-2257.2006.00825.x
Keywords
stem cell transplantation; graft-versus-host disease; regulatory T cell; immunoregulation; human
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The mechanisms that induce and control the alloimmune inflammation of graft-versus-host disease (GvHD) after allogeneic stem cell transplantation (allo-SCT) are still incompletely understood. In the murine system, GvHD can be suppressed by CD4(+)CD25(+) regulatory T cells (TREG), which are generally involved in the suppression of inflammatory reactions. A disruption of the homeostasis between TREG and conventional T cells might therefore be associated with the inflammatory reactions of GvHD. We repetitively measured the frequency of TREG in the peripheral blood of 29 patients within the first 71-373 days after allo-SCT and correlated the results with the clinical course. We demonstrate that the initial phase of GvHD is associated with a significant reduction of TREG in the peripheral blood, while at later stages and during intensified immunosuppressive therapy, increased numbers of TREG appear. These results might indicate a pathogenic role for reduced numbers of TREG in the induction of human GvHD.
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