Article (Scientific journals)
Evidence for neo-generation of T cells by the thymus after non-myeloablative conditioning.
Castermans, Emilie; Baron, Frédéric; Willems, Evelyne et al.
2008In Haematologica, 93 (2), p. 240-7
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Keywords :
Adult; Aged; Anesthesia Recovery Period; CD8-Positive T-Lymphocytes/immunology; Cyclosporine/administration & dosage; Female; Flow Cytometry; Graft vs Host Disease/immunology/prevention & control; Histocompatibility Testing; Humans; Immunosuppressive Agents/administration & dosage; Lymphocyte Depletion; Male; Middle Aged; Mycophenolic Acid/administration & dosage/analogs & derivatives; Myeloablative Agonists/administration & dosage; Neoplasms; Peripheral Blood Stem Cell Transplantation; Receptors, Antigen, T-Cell, alpha-beta/immunology; Thymus Gland/immunology; Time Factors; Tissue Donors; Transplantation Conditioning; Transplantation, Homologous; Vidarabine/administration & dosage/analogs & derivatives; Whole-Body Irradiation
Abstract :
[en] BACKGROUND: Background and objective. We investigated immune recovery in 50 patients given either unmanipulated or CD8-depleted allogeneic peripheral blood stem cells after non-myeloablative conditioning. DESIGN AND METHODS: Fifty patients were randomized to receive either CD8-depleted (n=22) or non-manipulated (n=28) peripheral blood stem cells. The median patients age was 57 (range 36-69) years. The conditioning regimen consisted of 2 Gy total body irradiation with or without added fludarabine. Twenty patients received grafts from related donors, 14 from 10/10 HLA-allele matched unrelated donors, and 16 from HLA-mismatched unrelated donors. Graft-versus-host disease pro-phylaxis consisted of mycophenolate mofetil and cyclosporine. Immune recovery during the first year after hematopoietic cell transplantation was assessed by flow cytometry phenotyping, analyses of the diversity of the TCRBV repertoire, and quantification of signal-joint T-cell receptor excision circles (sjTREC). RESULTS: CD8-depletion of the graft reduced the recovery of CD8(+) T-cell counts in the first 6 months following transplantation (p<0.0001) but had no significant impact on the restoration of other T-cell subsets. Both sjTREC concentration and CD3(+) T-cell counts increased significantly between day 100 and 365 (p=0.010 and p=0.0488, respectively) demonstrating neo-production of T cells by the thymus. Factors associated with high sjTREC concentration 1 year after transplantation included an HLA-matched unrelated donor (p=0.029), a high content of T cells in the graft (p=0.002), and the absence of chronic graft-versus-host disease (p<0.0001). CONCLUSIONS: Our data suggest that while immune recovery is mainly driven by peripheral expansion of the graft-contained mature T cells during the first months after non-myeloablative transplantation, T-cell neo-generation by the thymus plays an important role in long term immune reconstitution in transplanted patients.
Research center :
GIGA-I3 - Giga-Infection, Immunity and Inflammation - ULiège
Disciplines :
Hematology
Author, co-author :
Castermans, Emilie  ;  Université de Liège - ULiège > Département des sciences cliniques > Hématologie - Oncologie médicale
Baron, Frédéric   ;  Centre Hospitalier Universitaire de Liège - CHU > Hématologie clinique
Willems, Evelyne ;  Université de Liège - ULiège > Département des sciences cliniques > Hématologie
Schaaf-Lafontaine, Nicole ;  Centre Hospitalier Universitaire de Liège - CHU > Hématologie biologique et immuno hématologie
Meuris, Nathalie ;  Centre Hospitalier Universitaire de Liège - CHU > Génétique
Gothot, André ;  Centre Hospitalier Universitaire de Liège - CHU > Hématologie biologique et immuno hématologie
Vanbellinghen, Jean-François ;  Centre Hospitalier Universitaire de Liège - CHU > Génétique
Herens, Christian ;  Université de Liège - ULiège > Département des sciences de la santé publique > Informatique médicale et biostatistique
Seidel, Laurence  ;  Université de Liège - ULiège > Centre d'immunologie - Embryologie
Geenen, Vincent 
Cheynier, Rémi;  Centre Hospitalier Universitaire de Liège - CHU > Hématologie clinique
Beguin, Yves  
 These authors have contributed equally to this work.
Language :
English
Title :
Evidence for neo-generation of T cells by the thymus after non-myeloablative conditioning.
Publication date :
2008
Journal title :
Haematologica
ISSN :
0390-6078
eISSN :
1592-8721
Publisher :
Ferrata Storti Foundation, Pavia, Italy
Volume :
93
Issue :
2
Pages :
240-7
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Fondation contre le Cancer [BE]
Commentary :
Obtained from Haematologica/the Hematology Journal website http://www.haematologica.org
Available on ORBi :
since 10 February 2009

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