Regulation of acute graft-versus-host disease by microRNA-155

Blood
Parvathi RanganathanRamiro Garzon

Abstract

Acute graft-versus-host disease (aGVHD) remains a major complication of allogeneic hematopoietic stem cell transplant (alloHSCT), underscoring the need to further elucidate its mechanisms and develop novel treatments. Based on recent observations that microRNA-155 (miR-155) is up-regulated during T-cell activation, we hypothesized that miR-155 is involved in the modulation of aGVHD. Here we show that miR-155 expression was up-regulated in T cells from mice developing aGVHD after alloHSCT. Mice receiving miR-155-deficient donor lymphocytes had markedly reduced lethal aGVHD, whereas lethal aGVHD developed rapidly in mice recipients of miR-155 overexpressing T cells. Blocking miR-155 expression using a synthetic anti-miR-155 after alloHSCT decreased aGVHD severity and prolonged survival in mice. Finally, miR-155 up-regulation was shown in specimens from patients with pathologic evidence of intestinal aGVHD. Altogether, our data indicate a role for miR-155 in the regulation of GVHD and point to miR-155 as a novel target for therapeutic intervention in this disease.

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Related Concepts

T-Lymphocyte
Spleen
Lymphocytes as Percentage of Blood Leukocytes (Lab Test)
Acute GVH Disease
Graft-vs-Host Disease
RNA, Small Temporal
Acute Disease
Mice, Inbred DBA
Lymphocyte Activation
T-Cell Activation

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