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- W2096551536 abstract "Abstract Selective depletion (SD) of host-reactive donor T cells from allogeneic stem-cell transplants (SCTs) using an anti-CD25 immunotoxin (IT) is a strategy to prevent acute graft-versus-host disease (aGvHD). There is concern that concurrent removal of regulatory T cells (Tregs) with incomplete removal of alloactivated CD25+ T cells could increase the risk of aGvHD. We therefore measured Tregs in the blood of 16 patients receiving a T-cell–depleted allograft together with anti–CD25-IT–treated SD lymphocytes, in 13 of their HLA-identical donors, and in 10 SD products. Tregs were characterized by intracellular staining for forkhead box protein 3 (FOXP3) and by quantitative reverse-transcription–polymerase chain reaction (qRT-PCR) for FOXP3 gene in CD4+ cells. Patients received a median of 1.0 × 108/kg SD T cells and a stem cell product containing a median of 0.25 × 104/kg residual T cells. Tregs reconstituted promptly after SCT and underwent further expansion. Of the CD4+ T cells in SD products, 1.5% to 4.8% were CD25− Tregs. Acute GvHD (≥ grade II) was restricted to 5 patients whose donors had significantly (P = .019) fewer Tregs compared with those without clinically significant aGvHD. These results suggest that rapid Treg reconstitution can occur following SD allografts, either from CD25− Tregs escaping depletion, or from residual CD25− and CD25+ Tregs contained in the stem-cell product that expand after transplantation and may confer additional protection against GvHD." @default.
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- W2096551536 date "2007-09-01" @default.
- W2096551536 modified "2023-10-03" @default.
- W2096551536 title "Reconstitution of FOXP3+ regulatory T cells (Tregs) after CD25-depleted allotransplantion in elderly patients and association with acute graft-versus-host disease" @default.
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- W2096551536 doi "https://doi.org/10.1182/blood-2007-03-079160" @default.
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