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Tan KS, Inoue T, Kulkeaw K, Tanaka Y, Lai MI, Sugiyama D. Localized SCF and IGF-1 secretion enhances erythropoiesis in the spleen of murine embryos. Biol Open 2015; 4:596-607. [PMID: 25887124 PMCID: PMC4434811 DOI: 10.1242/bio.201410686] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Fetal spleen is a major hematopoietic site prior to initiation of bone marrow hematopoiesis. Morphologic analysis suggested erythropoietic activity in fetal spleen, but it remained unclear how erythropoiesis was regulated. To address this question, we performed flow cytometric analysis and observed that the number of spleen erythroid cells increased 18.6-fold from 16.5 to 19.5 days post-coitum (dpc). Among erythropoietic cytokines, SCF and IGF-1 were primarily expressed in hematopoietic, endothelial and mesenchymal-like fetal spleen cells. Cultures treated with SCF and/or IGF-1R inhibitors showed significantly decreased CD45−c-Kit−CD71+/−Ter119+ erythroid cells and downregulated Gata1, Klf1 and β-major globin expression. Administration of these inhibitors to pregnant mice significantly decreased the number of CD45−c-Kit−CD71+/−Ter119+ cells and downregulated β-major globin gene expression in embryos derived from these mice. We conclude that fetal spleen is a major erythropoietic site where endothelial and mesenchymal-like cells primarily accelerate erythropoietic activity through SCF and IGF-1 secretion.
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Affiliation(s)
- Keai Sinn Tan
- Department of Research and Development of Next Generation Medicine, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582 Japan Department of Pathology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia
| | - Tomoko Inoue
- Department of Research and Development of Next Generation Medicine, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582 Japan
| | - Kasem Kulkeaw
- Department of Research and Development of Next Generation Medicine, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582 Japan
| | - Yuka Tanaka
- Center for Clinical and Translational Research, Kyushu University Hospital, Fukuoka 812-8582 Japan Department of Clinical Study, Center for Advanced Medical Innovation, Kyushu University, Fukuoka 812-8582 Japan
| | - Mei I Lai
- Department of Pathology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia
| | - Daisuke Sugiyama
- Department of Research and Development of Next Generation Medicine, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582 Japan Center for Clinical and Translational Research, Kyushu University Hospital, Fukuoka 812-8582 Japan Department of Clinical Study, Center for Advanced Medical Innovation, Kyushu University, Fukuoka 812-8582 Japan
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Kummalue T, Inoue T, Miura Y, Narusawa M, Inoue H, Komatsu N, Wanachiwanawin W, Sugiyama D, Tani K. Ribosomal protein L11- and retinol dehydrogenase 11-induced erythroid proliferation without erythropoietin in UT-7/Epo erythroleukemic cells. Exp Hematol 2015; 43:414-423.e1. [PMID: 25829192 DOI: 10.1016/j.exphem.2015.01.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2014] [Revised: 01/08/2015] [Accepted: 01/11/2015] [Indexed: 12/31/2022]
Abstract
Erythropoiesis is the process of proliferation, differentiation, and maturation of erythroid cells. Understanding these steps will help to elucidate the basis of specific diseases associated with abnormal production of red blood cells. In this study, we continued our efforts to identify genes involved in erythroid proliferation. Lentivirally transduced UT-7/Epo erythroleukemic cells expressing ribosomal protein L11 (RPL11) or retinol dehydrogenase 11 (RDH11) could proliferate in the absence of erythropoietin, and their cell-cycle profiles revealed G0/G1 prolongation and low percentages of apoptosis. RPL11-expressing cells proliferated more rapidly than the RDH11-expressing cells. The antiapoptotic proteins BCL-XL and BCL-2 were expressed in both cell lines. Unlike the parental UT-7/Epo cells, the expression of hemoglobins (Hbs) in the transduced cells had switched from adult to fetal type. Several signal transduction pathways, including STAT5, were highly activated in transduced cells; furthermore, expression of the downstream target genes of STAT5, such as CCND1, was upregulated in the transduced cells. Taken together, the data indicate that RPL11 and RDH11 accelerate erythroid cell proliferation by upregulating the STAT5 signaling pathway with phosphorylation of Lyn and cyclic AMP response element-binding protein (CREB).
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Affiliation(s)
- Tanawan Kummalue
- Department of Clinical Pathology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Tomoko Inoue
- Division of Molecular and Clinical Genetics, Department of Molecular Genetics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan; Department of Research and Development of Next Generation Medicine, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Yoshie Miura
- Division of Molecular and Clinical Genetics, Department of Molecular Genetics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Megumi Narusawa
- Division of Molecular and Clinical Genetics, Department of Molecular Genetics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
| | - Hiroyuki Inoue
- Division of Molecular and Clinical Genetics, Department of Molecular Genetics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan; Department of Advanced Molecular and Cell Therapy, Kyushu University Hospital, Fukuoka, Japan
| | - Norio Komatsu
- Department of Hematology, School of Medicine, Juntendo University, Tokyo, Japan
| | - Wanchai Wanachiwanawin
- Division of Hematology, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Daisuke Sugiyama
- Department of Research and Development of Next Generation Medicine, Faculty of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Kenzaburo Tani
- Division of Molecular and Clinical Genetics, Department of Molecular Genetics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan; Department of Advanced Molecular and Cell Therapy, Kyushu University Hospital, Fukuoka, Japan.
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TGF-beta-1 up-regulates extra-cellular matrix production in mouse hepatoblasts. Mech Dev 2012; 130:195-206. [PMID: 23041440 DOI: 10.1016/j.mod.2012.09.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Revised: 09/09/2012] [Accepted: 09/15/2012] [Indexed: 12/12/2022]
Abstract
Fetal liver is the major embryonic hematopoietic organ and is extrinsically colonized by circulating hematopoietic stem cells (HSCs). Integrin beta-1 expression on HSCs is crucial for colonization, suggesting that interaction of Integrin beta-1 with extra-cellular matrix (ECM) factors promotes HSC adherence to fetal liver. However, little is known about how ECM production is regulated in fetal liver. Here we used flow cytometry to sort fetal liver compartments and detected ECM gene and protein expression predominantly in sorted hepatoblasts. mRNA and protein analysis suggested that TGF-beta-1 expressed by hepatoblasts, sinusoid endothelial cells and hematopoietic cells, binds to the TGF-beta receptor type-2 expressed on hepatoblasts to stimulate ECM production. Intra-cardiac injection of TGF-inhibitors into mouse embryos dramatically decreased fetal liver ECM gene expression. Taken together, our observations suggest that hepatoblasts predominantly produce ECM factors under control of TGF-beta-1 in fetal liver.
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Ectopic expression of Hmgn2 antagonizes mouse erythroid differentiation in vitro. Cell Biol Int 2012; 36:195-202. [PMID: 21988615 DOI: 10.1042/cbi20110169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Hmgn2 (high mobility group nucleosomal 2), a ubiquitous nucleosome-binding protein that unfolds chromatin fibres and enhances DNA replication, reportedly regulates differentiation of epithelial and mesenchymal cells. To investigate how Hmgn2 regulates HC (haemopoietic cell) differentiation, we quantified Hmgn2 expression in HCs of mouse FL (fetal liver) during erythroid differentiation. Hmgn2 expression levels were >10-fold higher in immature erythroid progenitors than in mature erythroid cells, suggesting that Hmgn2 antagonizes erythroid differentiation. To address this issue, Hmgn2 were transfected into both Friend erythroleukaemia cells and FL HCs. There was a 3.3-fold decrease in relatively mature c-Kit(+)/CD71(+) erythroid cells, a 2.9-fold increase in immature c-Kit(+)/CD71(-) erythroid cells in transfected Friend cells, a 1.1-fold decrease in relatively mature CD71(+)/Ter119(+) erythroid cells, and a 1.7-fold increase in relatively immature c-Kit(+)/CD71(+) erythroid cells in FL HCs accompanied by down-regulation of genes encoding the erythroid transcription factors, Gata1 and Klf1. Two days after Hmgn2 transfection of Friend erythroleukaemia cells, the number of S-phase cells increased, whereas the number of cells in G(1) decreased, while that of mitotic cells remained unchanged. We conclude that ectopic expression of Hmgn2 antagonizes mouse erythroid differentiation in vitro, which may be due to enhancement of DNA replication and/or blocking entry of mitosis at S-phase.
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Sugiyama D, Kulkeaw K, Mizuochi C, Horio Y, Okayama S. Hepatoblasts comprise a niche for fetal liver erythropoiesis through cytokine production. Biochem Biophys Res Commun 2011; 410:301-6. [PMID: 21664343 DOI: 10.1016/j.bbrc.2011.05.137] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Accepted: 05/23/2011] [Indexed: 11/24/2022]
Abstract
In mammals, definitive erythropoiesis first occurs in fetal liver (FL), although little is known about how the process is regulated. FL consists of hepatoblasts, sinusoid endothelial cells and hematopoietic cells. To determine niche cells for fetal liver erythropoiesis, we isolated each FL component by flow cytometry. mRNA analysis suggested that Dlk-1-expressing hepatoblasts primarily expressed EPO and SCF, genes encoding erythropoietic cytokines. EPO protein was detected predominantly in hepatoblasts, as assessed by ELISA and immunohistochemistry, and was not detected in sinusoid endothelial cells and hematopoietic cells. To characterize hepatoblast function in FL, we analyzed Map2k4(-/-) mouse embryos, which lack hepatoblasts, and observed down-regulation of EPO and SCF expression in FL relative to wild-type mice. Our observations demonstrate that hepatoblasts comprise a niche for erythropoiesis through cytokine secretion.
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Affiliation(s)
- Daisuke Sugiyama
- Division of Hematopoietic Stem Cells, Advanced Medical Initiatives, Department of Advanced Medical Initiatives, Kyushu University Faculty of Medical Sciences, Fukuoka 812-8582, Japan
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