• Bone Marrow Transplant. · Oct 2000

    Case Reports

    Lymphocyte subset reconstitution after HLA-identical placental blood transplantation (PBT) or PBT plus bone marrow transplantation (BMT) in three children with beta-thalassemia major.

    • A Vitucci, G Lucivero, F Locatelli, M Capocasale, N Tannoia, and A Pietrapertosa.
    • Division of Hematology II University of Bari, Italy.
    • Bone Marrow Transplant. 2000 Oct 1; 26 (7): 743-7.

    AbstractThe kinetics of circulating lymphoid cells were evaluated in three children suffering from beta-thalassemia major after HLA-identical sibling placental blood transplant (PBT) in one patient and placental blood plus bone marrow transplantation (BMT) in two patients. Recovery of the main lymphocyte subsets, as determined by phenotype analysis of circulating PBMCs, was complete within 2 months after transplant. NK (CD56+) cells were the first to appear in peripheral blood, followed by T (CD3+, CD2+, CD7+) and B (CD19+) cells. Of the T lymphocytes, the CD8+ were the first to reconstitute, but recovery of CD4+ cells was also rapid and within 6 months these T cells reached normal values. The expression of CD57 by NK or T cells was slightly delayed. The evaluation of RA and RO isoform expression of the CD45 molecule showed a prevalence of the CD45RA antigen with a ratio of 2-3:1. In the PBT only patient, T cells expressing the CD45RO antigen prevailed in the early post-transplant period. Severe or chronic GVHD was not observed. This experience demonstrates that reconstitution of lymphocyte subsets is successful in genetic hematological diseases after transplantation of HLA-identical placental blood or placental blood plus bone marrow from healthy or heterozygous siblings. Bone Marrow Transplantation (2000) 26, 743-747.

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