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Kusakabe, Manabu; Hasegawa, Kazuteru; Hamada, Michito; Nakamura, Megumi; Ohsumi, Takayuki; Suzuki, Hirona; Mai, Tran Thi Nhu; Kudo, Takashi; Uchida, Kazuhiko; Ninomiya, Haruhiko; Chiba, Shigeru; Takahashi, Satoru
Blood, 08/2011, Letnik: 118, Številka: 5Journal Article
c-Maf is one of the large Maf (musculoaponeurotic fibrosarcoma) transcription factors that belong to the activated protein-1 super family of basic leucine zipper proteins. Despite its overexpression in hematologic malignancies, the physiologic roles c-Maf plays in normal hematopoiesis have been largely unexplored. On a C57BL/6J background, c-Maf−/− embryos succumbed from severe erythropenia between embryonic day (E) 15 and E18. Flow cytometric analysis of fetal liver cells showed that the mature erythroid compartments were significantly reduced in c-Maf−/− embryos compared with c-Maf+/+ littermates. Interestingly, the CFU assay indicated there was no significant difference between c-Maf+/+ and c-Maf−/− fetal liver cells in erythroid colony counts. This result indicated that impaired definitive erythropoiesis in c-Maf−/− embryos is because of a non–cell-autonomous effect, suggesting a defective erythropoietic microenvironment in the fetal liver. As expected, the number of erythroblasts surrounding the macrophages in erythroblastic islands was significantly reduced in c-Maf−/− embryos. Moreover, decreased expression of VCAM-1 was observed in c-Maf−/− fetal liver macrophages. In conclusion, these results strongly suggest that c-Maf is crucial for definitive erythropoiesis in fetal liver, playing an important role in macrophages that constitute erythroblastic islands.
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