Abstract:
BACKGROUND:Transfusion-related acute lung injury (TRALI) is one of the most serious adverse events following transfusion, and there is no specific treatment in clinical practice. However, regulatory T cells (Tregs) have been suggested to play a potential role in the treatment of TRALI. This study investigated whether interleukin (IL)-2 or IL-2/anti-IL-2 complexes (IL-2c), which are mediators of Treg expansion, can modulate the severity of antibody-mediated TRALI in vivo. STUDY DESIGN AND METHODS:This study utilized a mouse model of the "two-hit" mechanism: BALB/c mice were primed with lipopolysaccharide (LPS) as the first hit, and then TRALI was induced by injecting major histocompatibility complex Class I antibodies. Mice injected with LPS only or LPS combined with isotype control antibodies served as controls. For the Treg-depleted groups, mice were infused with anti-mouse IL-2Rα first and then subjected to the same treatments as the TRALI group. Regarding IL-2- and IL-2c-treated mice, recombinant murine IL-2 or IL-2c was intraperitoneally administered to mice for 5 consecutive days before induction of the TRALI model. Samples were collected 2 hours after TRALI induction. RESULTS:Prophylactic administration of IL-2 or IL-2c to mice prevented the onset of edema, pulmonary protein levels, and proinflammatory factors that inhibited polymorphonuclear neutrophil aggregation in the lungs. Furthermore, the percentage of CD4+ CD25+ FoxP3+ Tregs was expanded in vivo using IL-2 and IL-2c compared to TRALI mice, as was confirmed through analysis of the spleen, blood, and lung. CONCLUSION:This study validates that the protective mechanisms against TRALI involve CD4+ CD25+ FoxP3+ Tregs, which can be expanded in vivo by IL-2 and IL-2c. This results in increased IL-10 levels and decreased IL-17A, thereby prophylactically preventing antibody-mediated murine TRALI.
journal_name
Transfusionjournal_title
Transfusionauthors
He R,Li L,Kong Y,Tian L,Tian X,Fang P,Bian M,Liu Zdoi
10.1111/trf.15064subject
Has Abstractpub_date
2019-02-01 00:00:00pages
534-544issue
2eissn
0041-1132issn
1537-2995journal_volume
59pub_type
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