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長谷川 菜摘大学院保健学研究科 保健学専攻助教
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■ 論文- Matrix Gla protein (MGP), a modulator of the BMP-SMAD signals, inhibits arterial calcification in a Glu γ-carboxylation dependent manner but the role of MGP highly expressed in a subset of bone marrow (BM) mesenchymal stem/stromal cells is unknown. Here we provide evidence that MGP might be a niche factor for both normal and malignant myelopoiesis. When mouse BM hematopoietic cells were cocultured with mitomycin C-treated BM stromal cells in the presence of anti-MGP antibody, growth of hematopoietic cells was reduced by half, and maintenance of long-term culture-initiating cells (LTC-ICs) was profoundly attenuated. Antibody-mediated blockage of MGP also inhibited growth (by a fifth) and cobblestone formation (by half) of stroma-dependent MB-1 myeloblastoma cells. MGP was undetectable in normal hematopoietic cells but was expressed in various mesenchymal cells and was aberrantly high in MB-1 cells. MGP and bone morphogenetic protein (BMP)-4 were co-induced in stromal cells cocultured with both normal hematopoietic cells and MB-1 myeloblastoma cells in an oscillating several days-periodic manner. BMP-2 was also induced in stromal cells cocultured with normal hematopoietic cells but was barely expressed when cocultured with MB-1 cells. GST-pulldown and luciferase reporter assays showed that uncarboxylated MGP interacted with BMP-4 and that anti-MGP antibody abolished this interaction. LDN-193189, a selective BMP signaling inhibitor, inhibited growth and cobblestone formation of MB-1 cells. The addition of warfarin, a selective inhibitor of vitamin K-dependent Glu γ-carboxylation, did not affect MB-1 cell growth, suggesting that uncarboxylated MGP has a biological effect in niche. These results indicate that MGP may maintain normal and malignant hematopoietic progenitor cells, possibly by modulating BMP signals independently of Glu γ-carboxylation. Aberrant MGP by leukemic cells and selective induction of BMP-4 relative to BMP-2 in stromal cells might specify malignant niche.2020年04月, Heliyon, 6(4) (4), e03743, 英語, 国際誌[査読有り]研究論文(学術雑誌)
- Translin, a ubiquitous RNA/DNA-binding protein that forms a hetero-octamer together with Translin-associated factor X (TRAX), possesses endoribonuclease activity and plays a physiological role in restricting the size and differentiation of mesenchymal precursor cells. However, the precise role of Translin in epithelial cells remains unclear. Here, we show evidence that Translin restricts the growth of pubertal mammary epithelial cells. The mammary epithelia of Translin-null females exhibited retarded growth before puberty, but highly enhanced growth and DNA synthesis with increased ramification after the onset of puberty. Primary cultures of Translin-null mammary epithelial cells showed augmented DNA synthesis in a ligand-independent and ligand-enhanced manner. Translin-null ovariectomized mice implanted with slow-release estrogen pellets showed enhanced length and ramification of the mammary glands. Mammary epithelial growth was also observed in ovariectomized Translin-null mice implanted with placebo pellets. Luciferase reporter assays using embryonic fibroblasts from Translin-null mice showed unaltered estrogen receptor α function. These results indicate that Translin plays a physiological role in restricting intrinsic growth, beyond mesenchymal cells, of pubertal mammary epithelial cells.Elsevier BV, 2020年01月, Biochemical and Biophysical Research Communications, 521(3) (3), 562 - 568, 英語, 国際誌研究論文(学術雑誌)
- Transcriptional activation by PML-RARα, an acute promyelocytic leukemia-related oncofusion protein, requires pharmacological concentrations of all-trans retinoic acid (ATRA). However, the mechanism by which the liganded PML-RARα complex leads to the formation of the preinitiation complex has been unidentified. Here we demonstrate that the Mediator subunit MED1 plays an important role in the ATRA-dependent activation of the PML-RARα-bound promoter. Luciferase reporter assays showed that PML-RARα induced significant transcription at pharmacological doses (1 μM) of ATRA; however, this was submaximal and equivalent to the level of transcription driven by intact RARα at physiological doses (1 nM) of ATRA. Transcription depended upon the interaction of PML-RARα with the two LxxLL nuclear receptor recognition motifs of MED1, and LxxLL→LxxAA mutations led to minimal transcription. Mechanistically, MED1 interacted ATRA-dependently with the RARα portion of PML-RARα through the two LxxLL motifs of MED1. These results suggest that PML-RARα initiates ATRA-induced transcription through its interaction with MED1.2019年06月, Transcription, 10(3) (3), 147 - 156, 英語, 国際誌研究論文(学術雑誌)
- Elsevier B.V., 2018年09月, Biochemical and Biophysical Research Communications, 504(1) (1), 115 - 122, 英語研究論文(学術雑誌)
- 2016年09月, BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 478(4) (4), 1706 - 1712, 英語[査読有り]研究論文(学術雑誌)
- 2014年01月, GENES TO CELLS, 19(1) (1), 28 - 51, 英語[査読有り]研究論文(学術雑誌)
- 2013年10月, Biochem Biophys Res Commun., 440(1) (1), 184 - 189, 英語[査読有り]研究論文(学術雑誌)
- 2013年10月, BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 440(1) (1), 125 - 131, 英語[査読有り]研究論文(学術雑誌)
- 2012年04月, MOLECULAR AND CELLULAR BIOLOGY, 32(8) (8), 1483 - 1495, 英語[査読有り]研究論文(学術雑誌)
- MED1/TRAP220, a subunit of the transcriptional Mediator/TRAP complex, is crucial for various biological events through its interaction with distinct activators, such as nuclear receptors and GATA family activators. In hematopoiesis, MED1 plays a pivotal role in optimal nuclear receptor-mediated myelomonopoiesis and GATA-1-induced erythropoiesis. In this study, we present evidence that MED1 in stromal cells is involved in supporting hematopoietic stem and/or progenitor cells (HSPCs) through osteopontin (OPN) expression. We found that the proliferation of bone marrow (BM) cells cocultured with MED1 knockout (Med1(-/-)) mouse embryonic fibroblasts (MEFs) was significantly suppressed compared to the control. Furthermore, the number of long-term culture-initiating cells (LTC-ICs) was attenuated for BM cells cocultured with Med1(-/-) MEFs. The vitamin D receptor (VDR)- and Runx2-mediated expression of OPN, as well as Mediator recruitment to the Opn promoter, was specifically attenuated in the Med1(-/-) MEFs. Addition of OPN to these MEFs restored the growth of cocultured BM cells and the number of LTC-ICs, both of which were attenuated by the addition of the anti-OPN antibody to Med1(+/+) MEFs and to BM stromal cells. Consequently, MED1 in niche appears to play an important role in supporting HSPCs by upregulating VDR- and Runx2-mediated transcription on the Opn promoter.2010年10月, Molecular and cellular biology, 30(20) (20), 4818 - 27, 英語, 国際誌研究論文(学術雑誌)
- 2008年11月, BLOOD, 112(11) (11), 1225 - 1225, 英語Involvement of Transcriptional Mediator Subunit TRAP220/MED1 in Action of Niche Cells to Support Hematopoietic Stem/Progenitor Cells.[査読有り]研究論文(その他学術会議資料等)
- 第40回日本分子生物学会, 2017年, 日本語, 国内会議転写共役因子MED1の核内受容体結合能は低温環境での体温維持に必須であるポスター発表
- 第40回日本分子生物学会, 2017年, 日本語, 国内会議転写共役因子MED1によるIL-33誘導性の2型自然リンパ球の動員調節ポスター発表
- 第40回日本分子生物学会, 2017年, 日本語, 国内会議MED1 の核内受容体結合能を廃絶した変異マウスにおける脂質代謝制御因子の発現ポスター発表
- 第40回日本分子生物学会, 2017年, 日本語, 国内会議GATA1のN端活性化ドメインを介する転写活性化におけるメディエーターの関与の可能性ポスター発表
- 第38回日本分子生物学会, 2016年, 日本語, 国内会議乳癌発症が遺伝要因と環境要因に依存する可能性−乳癌モデルマウスの検討ポスター発表
- 第38回日本分子生物学会, 2016年, 日本語, 国内会議骨髄間質細胞が産生するオステオポンチンは造血幹・前駆細胞をCD44を介して支持するポスター発表
- 第39回日本分子生物学会, 2016年, 日本語, 国内会議The role of MED1 in breast carcinogenesis and progressionポスター発表
- 第78回日本血液学会学術集会, 2016年, 日本語, 国内会議RAR-binding ability of MED1 is required for high-concentrationATRA-dependent activation of PML-RARαポスター発表
- 第38回日本分子生物学会, 2016年, 日本語, 国内会議Periostin supports normal and malignant hematopoietic stem/progenitor cells in vitro.ポスター発表
- 第38回日本分子生物学会, 2016年, 日本語, 国内会議Periostin supports hematopoietic stem/progenitor cells and niche-dependent myeloblastoma cells.ポスター発表
- 58th ASH Annual Meeting and Exposition, 2016年, 英語, 国際会議Periostin supports hematopoietic stem:progenitor cells and niche-dependent myeloblastoma cells in vitroポスター発表
- 第38回日本分子生物学会, 2016年, 日本語, 国内会議Mediator subunit MED1 is required for PML-RARα fusion protein-induced transcriptional activation in response high concentration all-trans retinoic acid.ポスター発表
- 第38回日本分子生物学会, 2016年, 日本語, 国内会議MED1結合蛋白CCAR1とCoCoAはPPARγ2誘導性の白色脂肪細胞分化を司るポスター発表
- 第78回日本血液学会学術集会, 2016年, 日本語, 国内会議MED1-dependent and -independent coactivation mechanism of Mediator for GATA1 actionポスター発表
- 日本血液学会, 2016年, 日本語, 国内会議High-concentration ATRA-dependent activation of PML-RARα requires Mediator subunit MED1.ポスター発表
- 第38回日本分子生物学会, 2016年, 日本語, 国内会議GATA1による転写活性化におけるMED1依存性と非依存性の機序ポスター発表
- International Conference on The Tumour Microenvironment in the Haematological Malignancies and its Therapeutic Targeting, European, 2015年05月, 英語, 国際会議Periostin supports normal and malignant hematopoietic stem/progenitor cells in vitro.ポスター発表
- 第38回日本分子生物学会, 2015年, 日本語, 国内会議乳癌発症が遺伝要因と環境要因に依存する可能性−乳癌モデルマウスの検討ポスター発表
- 第38回日本分子生物学会, 2015年, 日本語, 国内会議骨髄間質細胞が産生するオステオポンチンは造血幹・前駆細胞をCD44を介して支持するポスター発表
- 第38回日本分子生物学会, 2015年, 日本語, 国内会議Periostin supports normal and malignant hematopoietic stem:progenitor cells in vitro.ポスター発表
- 第38回日本分子生物学会, 2015年, 日本語, 国内会議Periostin supports hematopoietic stem:progenitor cells and niche-dependent myeloblastoma cells.ポスター発表
- 第38回日本分子生物学会, 2015年, 日本語, 国内会議Mediator subunit MED1 is required for PML-RARα fusion protein-induced transcriptional activation in response high concentration all-trans retinoic acid.ポスター発表
- 第38回日本分子生物学会, 2015年, 日本語, 国内会議MED1結合蛋白CCAR1とCoCoAはPPARγ2誘導性の白色脂肪細胞分化を司るポスター発表
- 第77回日本血液学会学術集会, 2015年, 日本語, 国内会議High-concentration ATRA-dependent activation of PML-RARα requires Mediator subunit MED1.ポスター発表
- 第38回日本分子生物学会, 2015年, 日本語, 国内会議GATA1による転写活性化におけるMED1依存性と非依存性の機序ポスター発表
- Highlights of ASH in Asia, 2014年03月, 英語, 国際会議FGF8 supports hematopoietic stem and progenitor cells and niche-dependent myeloblastoma cells via autocrine action on bone marrow stromal cells in vitro.[招待有り]口頭発表(招待・特別)
- 55th Annual Meeting of the American Society of Hematology, 2013年12月, 英語, 国際会議FGF7 supports hematopoietic stem and progenitor cells and niche-dependent myeloblastoma cells via autocrine action on bone marrow stromal cells in vitro.ポスター発表
- MECHANISMS OF EUKARYOTIC TRANSCRIPTION 2013, 2013年08月, 英語, Cold Spring Harbor Laboratory, 国際会議PHYSICAL INTERACTION BETWEEN PPARγ AND MEDIATOR SUBUNIT MED1 IS CRUCIAL FOR INDUCED ADIPOCYTE HYPERTROPHYポスター発表
■ 共同研究・競争的資金等の研究課題