title: Impairment of lymphopoiesis and myelopoiesis in mice reconstituted with bone marrow-hematopoietic progenitor cells expressing SDF-1-intrakine.
abstract: Both SDF-1 and CXCR4 disruption are lethal to mice at the embryonic stage and cause abnormalities in B lymphopoiesis, myelopoiesis, cardiogenesis, vasculogenesis, and cerebellar development. To investigate the role of SDF-1 and CXCR4 in hematopoiesis during the adult stage, mice reconstituted with bone marrow-derived hematopoietic progenitor cells transduced with either the SDF-1 or a genetically modified SDF-1-intrakine gene using a retroviral expression vector were analyzed. Flow cytometric (FCM) analysis showed a dramatic reduction of CXCR4 expression on the cells of intrakine-transduced mice, whereas CCR7 and CCR1 expression was unchanged or marginally decreased on splenocytes. Migration of splenocytes and bone marrow cells to SDF-1 was markedly suppressed in intrakine-transduced mice. FCM analysis of bone marrow cells of intrakine-transduced mice exhibited decreased numbers of pro-B (B220(+) CD43(+)), pre-B (B220(+) CD43(-)), and immature B (B220(+) IgM(+)) cells and a decreased number of granulocytes/myeloid (Gr1(+) CD11b(+)) cells. Impaired B lymphopoiesis and myelopoiesis in intrakine-transduced mice were confirmed by an in vitro colony-forming assay of bone marrow cells. In contrast, B lymphopoiesis and myelopoiesis were enhanced in SDF-1-transduced mice. Interestingly, T-cell maturation in the thymus was impaired both in intrakine- and SDF-1-transduced mice, suggesting that SDF-1 and CXCR4 play an important role in T lymphopoiesis as well as in B lymphopoiesis and myelopoiesis in adults. These results demonstrate an essential role of CXCR4 and its ligand SDF-1 in adult hematopoiesis, and they indicate the intrakine method as a powerful tool for functional analysis of chemokines/chemokine receptors in vivo and as a potential therapeutic approach for acquired immunodeficiency syndrome.
authors.affiliation: Department of Molecular Preventive Medicine and CREST, School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Onai
authors.forename: Y y
authors.initials: Yy
authors.lastname: Zhang
authors.forename: H
authors.initials: H
authors.lastname: Yoneyama
authors.forename: T
authors.initials: T
authors.lastname: Kitamura
authors.forename: S
authors.initials: S
authors.lastname: Ishikawa
authors.forename: K
authors.initials: K
authors.lastname: Matsushima
mesh_terms: D000818:Animals; D054377:Chemokine CXCL12; D019743:Chemokines, CXC / Q000502:physiology*; D005786:Gene Expression Regulation / Q000502:physiology; D018014:Gene Transfer Techniques; D005822:Genetic Vectors; D006412:Hematopoietic Stem Cells / Q000502:physiology*; D006801:Humans; D019891:Leukopoiesis / Q000502:physiology*; D051379:Mice; D019718:Receptors, CXCR4 / Q000502:physiology
chemical_list: C515255:CXCL12 protein, human; D054377:Chemokine CXCL12; D019743:Chemokines, CXC; C515256:Cxcl12 protein, mouse; D019718:Receptors, CXCR4