Linked Life Data

12351384

Source:http://linkedlifedata.com/resource/pubmed/id/12351384

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pubmed-article:12351384pubmed:abstractTextIn the search for genes expressed in hematopoietic stem cells, we identified that the expression of Gfi-1B (growth factor independence-1B) is highly restricted to hematopoietic stem cells, erythroblasts, and megakaryocytes. Gfi-1 and Gfi-1B are zinc finger proteins that share highly conserved SNAG and 6 zinc finger domains. Gfi-1 has been characterized as an oncogene involved in lymphoid malignancies in mice. In contrast, role of Gfi-1B in hematopoiesis has not been well characterized. In this study, we analyzed its function in human hematopoiesis. Enforced expression of Gfi-1B in human CD34(+) hematopoietic progenitors induced a drastic expansion of erythroblasts in an erythropoietin-independent manner. Expression of Gfi-1B did not promote erythroid commitment, but enhanced proliferation of immature erythroblasts. Erythroblasts expanded by exogenous Gfi-1B, however, failed to differentiate beyond proerythroblast stage and showed massive apoptosis. These biologic effects of Gfi-1B were mediated through its zinc finger domain, but not by the SNAG or non-zinc finger domain. Proliferation of erythroblasts was associated with sustained expression of GATA-2 but not of GATA-1, indicating a potential link between Gfi-1B and GATA family regulators. Importantly, the function of Gfi-1B to modulate transcription was dependent on promoter context. In addition, activation of transcription of an artificial promoter was mediated through its zinc finger domain. These findings establish Gfi-1B as a novel erythroid regulator and reveal its specific involvement in the regulation of erythroid cell growth through modulating erythroid-specific gene expression.lld:pubmed
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pubmed-article:12351384pubmed:articleTitleErythroid expansion mediated by the Gfi-1B zinc finger protein: role in normal hematopoiesis.lld:pubmed
pubmed-article:12351384pubmed:affiliationDepartment of Immunology, Institute of Basic Medical Sciences, University of Tsukuba, and Core Research for Evolutional Science and Technology of Japan Science and Technology, Japan.lld:pubmed
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