Long-term outcome of non-ablative booster BMT in patients with SCID.
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2013-08
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SCID is a fatal syndrome caused by mutations in at least 13 different genes. It is characterized by the absence of T cells. Immune reconstitution can be achieved through nonablative related donor BMT. However, the first transplant may not provide sufficient immunity. In these cases, booster transplants may be helpful. A prospective/retrospective study was conducted of 49 SCID patients (28.7% of 171 SCIDs transplanted over 30 years) who had received booster transplants to define the long-term outcome, factors contributing to a need for a booster and factors that predicted success. Of the 49 patients, 31 (63%) are alive for up to 28 years. Age at initial transplantation was found to have a significant effect on outcome (mean of 194 days old for patients currently alive, versus a mean of 273 days old for those now deceased, P=0.0401). Persistent viral infection was present in most deceased booster patients. In several patients, the use of two parents as sequential donors resulted in striking T-and B-cell immune reconstitution. A majority of the patients alive today have normal or adequate T-cell function and are healthy. Nonablative booster BMT can be lifesaving for SCID.
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Teigland, CL, RE Parrott and RH Buckley (2013). Long-term outcome of non-ablative booster BMT in patients with SCID. Bone Marrow Transplant, 48(8). pp. 1050–1055. 10.1038/bmt.2013.6 Retrieved from https://hdl.handle.net/10161/13739.
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Rebecca Hatcher Buckley
The overall emphasis of Dr. Buckley's research is in human T,B and NK cell development and in aberrations in their development and regulation. The work involves three particular areas of investigation: 1) the cellular and molecular bases of genetically-determined human immunodeficiency diseases, 2) the use of bone marrow stem cells to cure genetically-determined immunodeficiency diseases, and 3) the use of human SCID bone marrow stem cell chimeras to study human thymic education, T and B cell ontogeny, tolerance induction and MHC restriction mechanisms. Methodology includes monoclonal antibody (mAb) analyses of lymphocyte phenotypes, a variety of T cell and natural killer (NK) cell functional assays, studies of thymic output by T cell receptor recombination excision circle measurement, studies of T cell diversity by spectratyping, studies of T cell longevity by telomere analysis and assessment of B cell differentiation and function. A unique resource available for her studies is the largest population of patients with genetically-determined immunodeficiency diseases in the U.S., which includes the largest population in the world of longterm SCID chimeras treated at a single center, some of whom have been studied and followed for more than 37 years. The administration of rigorously T cell depleted haploidentical bone marrow stem cells to SCID recipients without pre-transplant conditioning or post-transplant use of immunosuppressive drugs to prevent GVHD provides an unmanipulated system for studying human thymic education, T and B cell ontogeny, MHC restriction mechanisms and tolerance induction. Studies to identify mutations in patients with primary immunodeficiency are continuing, particularly in those with SCID.
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