title: Reconstitution of lymphoid development and function in ZAP-70-deficient mice following gene transfer into bone marrow cells.
abstract: Mutations in the ZAP-70 protein tyrosine kinase gene result in a severe combined immunodeficiency (SCID) characterized by a selective inability to produce CD8(+) T cells and a signal transduction defect in peripheral CD4(+) cells. Transplantation of genetically modified hematopoietic progenitor cells that express the wild-type ZAP-70 gene may provide significant benefit to some of these infants. The feasibility of stem cell gene correction for human ZAP-70 deficiency was assessed using a ZAP-70 knock-out model. ZAP-70-deficient murine bone marrow progenitor cells were transduced with a retroviral vector expressing the human ZAP-70 gene. Engraftment of these cells in irradiated ZAP-70-deficient animals resulted in the development of mature CD4(+) and CD8(+) T cells. In marked contrast, both populations were absent in ZAP-70(-/-) mice undergoing transplantation with bone marrow progenitor cells transduced with a control vector. Importantly, ZAP-70-reconstituted T cells proliferated in response to T-cell receptor stimulation. Moreover, these ZAP-70-expressing T cells demonstrated a diverse T-cell receptor repertoire as monitored by the relative usage of each T-cell receptor beta chain hypervariable region subfamily. The presence of ZAP-70 in B cells did not affect either lipopolysaccharide- or lipopolysaccharide/interleukin-4-mediated immunoglobulin isotype switching. Altogether, these data indicate that retroviral-mediated gene transfer of the ZAP-70 gene may prove to have a therapeutic benefit for patients with ZAP-70-SCID.
authors.affiliation: Genetics and Molecular Biology Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, USA.
authors.forename: Makoto
authors.initials: M
authors.lastname: Otsu
authors.forename: Marcos
authors.initials: M
authors.lastname: Steinberg
authors.forename: Christophe
authors.initials: C
authors.lastname: Ferrand
authors.forename: Peggy
authors.initials: P
authors.lastname: Merida
authors.forename: Cosette
authors.initials: C
authors.lastname: Rebouissou
authors.forename: Pierre
authors.initials: P
authors.lastname: Tiberghien
authors.forename: Naomi
authors.initials: N
authors.lastname: Taylor
authors.forename: Fabio
authors.initials: F
authors.lastname: Candotti
authors.forename: Nelly
authors.initials: N
authors.lastname: Noraz
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000378:metabolism*; D015496:CD4-Positive T-Lymphocytes / Q000502:physiology; D018414:CD8-Positive T-Lymphocytes / Q000502:physiology; D002454:Cell Differentiation; D015870:Gene Expression; D005822:Genetic Vectors; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000378:metabolism*; D016130:Immunophenotyping; D008214:Lymphocytes / Q000276:immunology / Q000502:physiology*; D051379:Mice; D018345:Mice, Knockout; D016133:Polymerase Chain Reaction; D011505:Protein-Tyrosine Kinases / Q000172:deficiency* / Q000235:genetics*; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics; D012190:Retroviridae / Q000235:genetics; D016511:Severe Combined Immunodeficiency / Q000235:genetics / Q000628:therapy; D014162:Transfection; D051746:ZAP-70 Protein-Tyrosine Kinase
chemical_list: D016693:Receptors, Antigen, T-Cell, alpha-beta; D011505:Protein-Tyrosine Kinases; D051746:ZAP-70 Protein-Tyrosine Kinase; C497262:Zap70 protein, mouse