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Shin E, Park C, Park T, Chung H, Hwang H, Bak SH, Chung KS, Yoon SR, Kim TD, Choi I, Lee CH, Jung H, Noh JY. Deficiency of thioredoxin-interacting protein results in age-related thrombocytopenia due to megakaryocyte oxidative stress. J Thromb Haemost 2024; 22:834-850. [PMID: 38072375 DOI: 10.1016/j.jtha.2023.11.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 11/28/2023] [Accepted: 11/29/2023] [Indexed: 01/06/2024]
Abstract
BACKGROUND Platelets are generated from megakaryocytes (MKs), mainly located in the bone marrow (BM). Megakaryopoiesis can be affected by genetic disorders, metabolic diseases, and aging. The molecular mechanisms underlying platelet count regulation have not been fully elucidated. OBJECTIVES In the present study, we investigated the role of thioredoxin-interacting protein (TXNIP), a protein that regulates cellular metabolism in megakaryopoiesis, using a Txnip-/- mouse model. METHODS Wild-type (WT) and Txnip-/- mice (2-27-month-old) were studied. BM-derived MKs were analyzed to investigate the role of TXNIP in megakaryopoiesis with age. The global transcriptome of BM-derived CD41+ megakaryocyte precursors (MkPs) of WT and Txnip-/- mice were compared. The CD34+ hematopoietic stem cells isolated from human cord blood were differentiated into MKs. RESULTS Txnip-/- mice developed thrombocytopenia at 4 to 5 months that worsened with age. During ex vivo megakaryopoiesis, Txnip-/- MkPs remained small, with decreased levels of MK-specific markers. Critically, Txnip-/- MkPs exhibited reduced mitochondrial reactive oxygen species, which was related to AKT activity. Txnip-/- MkPs also showed elevated glycolysis alongside increased glucose uptake for ATP production. Total RNA sequencing revealed enrichment for oxidative stress- and apoptosis-related genes in differentially expressed genes between Txnip-/- and WT MkPs. The effects of TXNIP on MKs were recapitulated during the differentiation of human cord blood-derived CD34+ hematopoietic stem cells. CONCLUSION We provide evidence that the megakaryopoiesis pathway becomes exhausted with age in Txnip-/- mice with a decrease in terminal, mature MKs that response to thrombocytopenic challenge. Overall, this study demonstrates the role of TXNIP in megakaryopoiesis, regulating mitochondrial metabolism.
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Affiliation(s)
- Eunju Shin
- Aging Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Korea; College of Pharmacy, Chungnam National University, Yuseong-gu, Daejeon, Korea
| | - Charny Park
- Bioinformatics Team, Research Institute, National Cancer Center, Ilsandong-gu, Gyeonggi-do, Korea
| | - Taeho Park
- Aging Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Korea; Department of Functional Genomics, Korea University of Science and Technology, Yuseong-gu, Daejeon, Korea
| | - Hyunmin Chung
- College of Pharmacy, Chungnam National University, Yuseong-gu, Daejeon, Korea; Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Korea
| | - Hyeyeong Hwang
- Bioinformatics Team, Research Institute, National Cancer Center, Ilsandong-gu, Gyeonggi-do, Korea
| | - Seong Ho Bak
- Aging Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Korea; Department of Functional Genomics, Korea University of Science and Technology, Yuseong-gu, Daejeon, Korea
| | - Kyung-Sook Chung
- Department of Functional Genomics, Korea University of Science and Technology, Yuseong-gu, Daejeon, Korea; Stem Cell Convergence Research Center and Biomedical Translational Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Korea
| | - Suk Ran Yoon
- Department of Functional Genomics, Korea University of Science and Technology, Yuseong-gu, Daejeon, Korea; Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Korea
| | - Tae-Don Kim
- Department of Functional Genomics, Korea University of Science and Technology, Yuseong-gu, Daejeon, Korea; Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Korea
| | - Inpyo Choi
- Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Korea
| | - Chang Hoon Lee
- R&D Center, SCBIO Co, Ltd, Munji-ro, Yuseong-gu, Daejeon, Korea; Therapeutics and Biotechnology Division, Drug Discovery Platform Research Center, Korea Research Institute of Chemical Technology, Yuseong-gu, Daejeon, Korea
| | - Haiyoung Jung
- Aging Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Korea; Department of Functional Genomics, Korea University of Science and Technology, Yuseong-gu, Daejeon, Korea
| | - Ji-Yoon Noh
- Aging Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Korea; Department of Functional Genomics, Korea University of Science and Technology, Yuseong-gu, Daejeon, Korea.
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2
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Liao R, Babatunde A, Qiu S, Harikumar H, Coon JJ, Overmyer KA, Hannun YA, Luberto C, Bresnick EH. A transcriptional network governing ceramide homeostasis establishes a cytokine-dependent developmental process. Nat Commun 2023; 14:7262. [PMID: 37945603 PMCID: PMC10636182 DOI: 10.1038/s41467-023-42978-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 10/24/2023] [Indexed: 11/12/2023] Open
Abstract
Transcriptional mechanisms controlling developmental processes establish and maintain proteomic networks, which can govern the levels of intracellular small molecules. Although dynamic changes in bioactive small molecules can link transcription factor and genome activity with cell state transitions, many mechanistic questions are unresolved. Using quantitative lipidomics and multiomics, we discover that the hematopoietic transcription factor GATA1 establishes ceramide homeostasis during erythroid differentiation by regulating genes encoding sphingolipid metabolic enzymes. Inhibiting a GATA1-induced sphingolipid biosynthetic enzyme, delta(4)-desaturase, or disrupting ceramide homeostasis with cell-permeable dihydroceramide or ceramide is detrimental to erythroid, but not myeloid, progenitor activity. Coupled with genetic editing-based rewiring of the regulatory circuitry, we demonstrate that ceramide homeostasis commissions vital stem cell factor and erythropoietin signaling by opposing an inhibitory protein phosphatase 2A-dependent, dual-component mechanism. Integrating bioactive lipids as essential components of GATA factor mechanisms to control cell state transitions has implications for diverse cell and tissue types.
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Affiliation(s)
- Ruiqi Liao
- Wisconsin Blood Cancer Research Institute, Department of Cell and Regenerative Biology, Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Abiola Babatunde
- Wisconsin Blood Cancer Research Institute, Department of Cell and Regenerative Biology, Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Stephanie Qiu
- Wisconsin Blood Cancer Research Institute, Department of Cell and Regenerative Biology, Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Hamsini Harikumar
- Wisconsin Blood Cancer Research Institute, Department of Cell and Regenerative Biology, Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Joshua J Coon
- Department of Biomolecular Chemistry, National Center for Quantitative Biology of Complex Systems, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Morgridge Institute for Research, Madison, WI, USA
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, USA
| | - Katherine A Overmyer
- Department of Biomolecular Chemistry, National Center for Quantitative Biology of Complex Systems, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
- Morgridge Institute for Research, Madison, WI, USA
| | - Yusuf A Hannun
- Department of Medicine, Stony Book University, Stony Brook, NY, USA
- Northport Veterans Affairs Medical Center, Northport, NY, USA
| | - Chiara Luberto
- Department of Physiology and Biophysics, Stony Brook University, Stony Brook, NY, USA
| | - Emery H Bresnick
- Wisconsin Blood Cancer Research Institute, Department of Cell and Regenerative Biology, Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA.
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Goyal A, Agrawal A, Verma A, Dubey N. The PI3K-AKT pathway: A plausible therapeutic target in Parkinson's disease. Exp Mol Pathol 2023; 129:104846. [PMID: 36436571 DOI: 10.1016/j.yexmp.2022.104846] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 11/14/2022] [Accepted: 11/19/2022] [Indexed: 11/27/2022]
Abstract
Parkinson's disease is a common progressive and multifactorial neurodegenerative disease, characterized by the loss of midbrain dopaminergic neurons. Numerous pathological processes including, inflammation, oxidative stress, mitochondrial dysfunction, neurotransmitter imbalance, and apoptosis as well as genetic factors may lead to neuronal degeneration. With the emergence of aging population, the health problem and economic burden caused by PD also increase. Phosphatidylinositol 3-kinases-protein kinase B (PI3K-AKT) signaling pathway regulates signal transduction and biological processes such as cell proliferation, apoptosis and metabolism. According to reports, it regulates neurotoxicity and mediates the survival of neurons. Accumulating evidences indicate that some natural products can play a neuroprotective role by activating PI3K-AKT pathway, providing an effective resource for the discovery of potential therapeutic drugs. The current review provides an overview of the PI3K-AKT signaling pathway and review the relationship between this signaling pathway and PD.
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Affiliation(s)
- Ahsas Goyal
- Institute of Pharmaceutical Research, GLA University, Mathura, Uttar Pradesh, India.
| | - Anant Agrawal
- Institute of Pharmaceutical Research, GLA University, Mathura, Uttar Pradesh, India
| | - Aanchal Verma
- Institute of Pharmaceutical Research, GLA University, Mathura, Uttar Pradesh, India
| | - Nandini Dubey
- Institute of Pharmaceutical Research, GLA University, Mathura, Uttar Pradesh, India
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Cyrus C, Vatte C, Al-Nafie A, Chathoth S, Akhtar MS, Darwish M, Almohazey D, AlDubayan SH, Steinberg MH, Al-Ali A. miRNA Expression Associated with HbF in Saudi Sickle Cell Anemia. Medicina (B Aires) 2022; 58:medicina58101470. [PMID: 36295630 PMCID: PMC9611475 DOI: 10.3390/medicina58101470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 10/08/2022] [Accepted: 10/12/2022] [Indexed: 11/16/2022] Open
Abstract
Background and Objectives: Sickle cell anemia (SCA) is a hereditary monogenic disease due to a single β-globin gene mutation that codes for the production of sickle hemoglobin. Its phenotype is modulated by fetal hemoglobin (HbF), a product of γ-globin genes. Exploring the molecules that regulate γ-globin genes at both transcriptional and translational levels, including microRNA (miRNA), might help identify alternative therapeutic targets. Materials and Methods: Using next-generation sequencing we identified pre-miRNAs and mature miRNA expression signatures associated with different HbF levels in patients homozygous for the sickle hemoglobin gene. The involvement of identified miRNAs in potential SCD-related pathways was investigated with the DIANA TOOL and miRWalk 2.0 database. Results: miR-184 were most highly upregulated in reticulocytes. miR-3609 and miR-483-5p were most highly downregulated in sickle cell anemia with high HbF. miR-370-3p that regulates LIN28A, and miR-451a which is effective in modulating α- and β- globin levels were also significantly upregulated. miRNA targeted gene pathway interaction identified BCL7A, BCL2L1, LIN28A, KLF6, GATA6, solute carrier family genes and ZNF genes associated with erythropoiesis, cell cycle regulation, glycosphingolipid biosynthesis, cAMP, cGMP-PKG, mTOR, MAPK and PI3K-AKT signaling pathways and cancer pathways. Conclusions: miRNA signatures and their target genes identified novel miRNAs that could regulate fetal hemoglobin production and might be exploited therapeutically.
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Affiliation(s)
- Cyril Cyrus
- Department of Biochemistry, College of Medicine, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
- Correspondence: ; Tel.: +966-553241441
| | - Chittibabu Vatte
- Department of Biochemistry, College of Medicine, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
| | - Awatif Al-Nafie
- Department of Pathology, King Fahd Hospital of the University, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam 34445, Saudi Arabia
| | - Shahanas Chathoth
- Department of Biochemistry, College of Medicine, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
| | - Mohammed S. Akhtar
- Department of Biochemistry, College of Medicine, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
| | - Mohammed Darwish
- Ministry of Health, Qatif Central Hospital, Qatif 32654, Saudi Arabia
| | - Dana Almohazey
- Department of Stem Cell Research, Institute for Research and Medical Consultations, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi Arabia
| | - Saud H. AlDubayan
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Martin H. Steinberg
- Department of Medicine, Division of Hematology and Medical Oncology, Boston University School of Medicine, Boston, MA 02118, USA
| | - Amein Al-Ali
- Department of Biochemistry, College of Medicine, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
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5
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Hidalgo D, Bejder J, Pop R, Gellatly K, Hwang Y, Maxwell Scalf S, Eastman AE, Chen JJ, Zhu LJ, Heuberger JAAC, Guo S, Koury MJ, Nordsborg NB, Socolovsky M. EpoR stimulates rapid cycling and larger red cells during mouse and human erythropoiesis. Nat Commun 2021; 12:7334. [PMID: 34921133 PMCID: PMC8683474 DOI: 10.1038/s41467-021-27562-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 11/19/2021] [Indexed: 11/08/2022] Open
Abstract
The erythroid terminal differentiation program couples sequential cell divisions with progressive reductions in cell size. The erythropoietin receptor (EpoR) is essential for erythroblast survival, but its other functions are not well characterized. Here we use Epor-/- mouse erythroblasts endowed with survival signaling to identify novel non-redundant EpoR functions. We find that, paradoxically, EpoR signaling increases red cell size while also increasing the number and speed of erythroblast cell cycles. EpoR-regulation of cell size is independent of established red cell size regulation by iron. High erythropoietin (Epo) increases red cell size in wild-type mice and in human volunteers. The increase in mean corpuscular volume (MCV) outlasts the duration of Epo treatment and is not the result of increased reticulocyte number. Our work shows that EpoR signaling alters the relationship between cycling and cell size. Further, diagnostic interpretations of increased MCV should now include high Epo levels and hypoxic stress.
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Affiliation(s)
- Daniel Hidalgo
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Chan Medical School, Worcester, MA, USA
| | - Jacob Bejder
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Ramona Pop
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Chan Medical School, Worcester, MA, USA
- Harvard Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA, USA
| | - Kyle Gellatly
- Program in Bioinformatics and Computational Biology, University of Massachusetts Chan Medical School, Worcester, MA, USA
| | - Yung Hwang
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Chan Medical School, Worcester, MA, USA
| | - S Maxwell Scalf
- Department of Cell Biology and Yale Stem Cell Center, Yale University, New Haven, CT, USA
| | - Anna E Eastman
- Department of Cell Biology and Yale Stem Cell Center, Yale University, New Haven, CT, USA
| | - Jane-Jane Chen
- Institute for Medical Engineering & Science, MIT, Cambridge, MA, USA
| | - Lihua Julie Zhu
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Chan Medical School, Worcester, MA, USA
- Program in Bioinformatics and Computational Biology, University of Massachusetts Chan Medical School, Worcester, MA, USA
- Department of Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, MA, USA
| | | | - Shangqin Guo
- Department of Cell Biology and Yale Stem Cell Center, Yale University, New Haven, CT, USA
| | - Mark J Koury
- Department of Medicine, Division of Hematology and Oncology, Vanderbilt University Medical Center, Nashville, TN, USA
| | | | - Merav Socolovsky
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Chan Medical School, Worcester, MA, USA.
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6
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Malik MNH, Waqas SFH, Zeitvogel J, Cheng J, Geffers R, Gouda ZAE, Elsaman AM, Radwan AR, Schefzyk M, Braubach P, Auber B, Olmer R, Müsken M, Roesner LM, Gerold G, Schuchardt S, Merkert S, Martin U, Meissner F, Werfel T, Pessler F. Congenital deficiency reveals critical role of ISG15 in skin homeostasis. J Clin Invest 2021; 132:141573. [PMID: 34847081 PMCID: PMC8803340 DOI: 10.1172/jci141573] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 11/24/2021] [Indexed: 12/02/2022] Open
Abstract
Ulcerating skin lesions are manifestations of human ISG15 deficiency, a type I interferonopathy. However, chronic inflammation may not be their exclusive cause. We describe two siblings with recurrent skin ulcers that healed with scar formation upon corticosteroid treatment. Both had a homozygous nonsense mutation in the ISG15 gene, leading to unstable ISG15 protein lacking the functional domain. We characterized ISG15–/– dermal fibroblasts, HaCaT keratinocytes, and human induced pluripotent stem cell–derived vascular endothelial cells. ISG15-deficient cells exhibited the expected hyperinflammatory phenotype, but also dysregulated expression of molecules critical for connective tissue and epidermis integrity, including reduced collagens and adhesion molecules, but increased matrix metalloproteinases. ISG15–/– fibroblasts exhibited elevated ROS levels and reduced ROS scavenger expression. As opposed to hyperinflammation, defective collagen and integrin synthesis was not rescued by conjugation-deficient ISG15. Cell migration was retarded in ISG15–/– fibroblasts and HaCaT keratinocytes, but normalized under ruxolitinib treatment. Desmosome density was reduced in an ISG15–/– 3D epidermis model. Additionally, there were loose architecture and reduced collagen and desmoglein expression, which could be reversed by treatment with ruxolitinib/doxycycline/TGF-β1. These results reveal critical roles of ISG15 in maintaining cell migration and epidermis and connective tissue homeostasis, whereby the latter likely requires its conjugation to yet unidentified targets.
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Affiliation(s)
- Muhammad Nasir Hayat Malik
- Biomarkers for Infectious Diseases, Centre for Experimental and Clinical Infection Research, Twincore, Hannover, Germany
| | - Syed F Hassnain Waqas
- Biomarkers for Infectious Diseases, Centre for Experimental and Clinical Infection Research, Twincore, Hannover, Germany
| | - Jana Zeitvogel
- Institute for Dermatology, Allergology and Venerology, Hannover Medical School (MHH), Hannover, Germany
| | - Jingyuan Cheng
- Experimental Systems Immunology, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Robert Geffers
- Genome Analytics, Helmholtz Center for Infection Research, Braunschweig, Germany
| | | | | | - Ahmed R Radwan
- Department of Rheumatology and Rehabilitation, Sohag University, Sohag, Egypt
| | - Matthias Schefzyk
- Institute for Dermatology, Allergology and Venerology, Hannover Medical School (MHH), Hannover, Germany
| | - Peter Braubach
- Institute for Pathology, Hannover Medical School (MHH), Hannover, Germany
| | - Bernd Auber
- Institute for Human Genetics, Hannover Medical School (MHH), Hannover, Germany
| | - Ruth Olmer
- LEBAO, Hannover Medical School (MHH), Hannover, Germany
| | - Mathias Müsken
- Central Facility for Microscopy, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Lennart M Roesner
- Genome Analytics, Helmholtz Center for Infection Research, Braunschweig, Germany
| | - Gisa Gerold
- Institute for Experimental Virology, TWINCORE, Centre for Experimental and Clinical Infection Research, Hannover, Germany
| | - Sven Schuchardt
- Department of Bio and Environmental Analytics, Fraunhofer Institute for Toxicology and Experimental Medicine, Hannover, Germany
| | | | - Ulrich Martin
- LEBAO, Hannover Medical School (MHH), Hannover, Germany
| | - Felix Meissner
- Experimental Systems Immunology, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Thomas Werfel
- Genome Analytics, Helmholtz Center for Infection Research, Braunschweig, Germany
| | - Frank Pessler
- Biomarkers for Infectious Diseases, Centre for Experimental and Clinical Infection Research, Twincore, Hannover, Germany
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7
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FAM122A Inhibits Erythroid Differentiation through GATA1. Stem Cell Reports 2020; 15:721-734. [PMID: 32763160 PMCID: PMC7486200 DOI: 10.1016/j.stemcr.2020.07.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 07/11/2020] [Accepted: 07/11/2020] [Indexed: 12/15/2022] Open
Abstract
FAM122A is a highly conserved housekeeping gene, but its physiological and pathophysiological roles remain greatly elusive. Based on the fact that FAM122A is highly expressed in human CD71+ early erythroid cells, herein we report that FAM122A is downregulated during erythroid differentiation, while its overexpression significantly inhibits erythrocytic differentiation in primary human hematopoietic progenitor cells and erythroleukemia cells. Mechanistically, FAM122A directly interacts with the C-terminal zinc finger domain of GATA1, a critical transcriptional factor for erythropoiesis, and reduces GATA1 chromatin occupancy on the promoters of its target genes, thus resulting in the decrease of GATA1 transcriptional activity. The public datasets show that FAM122A is abnormally upregulated in patients with β-thalassemia. Collectively, our results demonstrate that FAM122A plays an inhibitory role in the regulation of erythroid differentiation, and it would be a potentially therapeutic target for GATA1-related dyserythropoiesis or an important regulator for amplifying erythroid cells ex vivo. FAM122A inhibits terminal erythroid differentiation FAM122A directly interacts with GATA1 FAM122A suppresses the DNA binding and transcriptional activities of GATA1 FAM122A is downregulated during terminal erythroid differentiation
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8
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Goupille O, Kadri Z, Langelé A, Luccantoni S, Badoual C, Leboulch P, Chrétien S. The integrity of the FOG-2 LXCXE pRb-binding motif is required for small intestine homeostasis. Exp Physiol 2019; 104:1074-1089. [PMID: 31012180 DOI: 10.1113/ep087369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 04/16/2019] [Indexed: 11/08/2022]
Abstract
NEW FINDINGS What is the central question of this study? Do Fog2Rb- / Rb- mice present a defect of small intestine homeostasis? What is the main finding and its importance? The importance of interactions between FOG-2 and pRb in adipose tissue physiology has previously been demonstrated. Here it is shown that this interaction is also intrinsic to small intestine homeostasis and exerts extrinsic control over mouse metabolism. Thus, this association is involved in maintaining small intestine morphology, and regulating crypt proliferation and lineage differentiation. It therefore affects mouse growth and adaptation to a high-fat diet. ABSTRACT GATA transcription factors and their FOG cofactors play a key role in tissue-specific development and differentiation, from worms to humans. We have shown that GATA-1 and FOG-2 contain an LXCXE pRb-binding motif. Interactions between retinoblastoma protein (pRb) and GATA-1 are crucial for erythroid proliferation and differentiation, whereas the LXCXE pRb-binding site of FOG-2 is involved in adipogenesis. Fog2-knock-in mice have defective pRb binding and are resistant to obesity, due to efficient white-into-brown fat conversion. Our aim was to investigate the pathophysiological impact of FOG-2-pRb interaction on the small intestine and mouse growth. Histological analysis of the small intestine revealed architectural changes in Fog2Rb- / Rb- mice, including villus shortening, with crypt expansion and a change in muscularis propria thickness. These differences were more marked in the proximo-distal part of the small intestine and were associated with an increase in crypt cell proliferation and disruption of the goblet and Paneth cell lineage. The small intestine of the mutants was unable to adapt to a high-fat diet, and had significantly lower plasma lipid levels on such a diet. Fog2Rb- / Rb- mice displayed higher levels of glucose-dependent insulinotropic peptide release, and lower levels of insulin-like growth factor I release on a regular diet. Their intestinal lipid absorption was impaired, resulting in restricted weight gain. In addition to the intrinsic effects of the mutation on adipose tissue, we show here an extrinsic relationship between the intestine and the effect of FOG-2 mutation on mouse metabolism. In conclusion, the interaction of FOG-2 with pRb coordinates the crypt-villus axis and controls small intestine homeostasis.
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Affiliation(s)
- Olivier Goupille
- Division of Innovative Therapies, UMR E007, Institute of Biology François Jacob, CEA, Université Paris Sud, Université Paris-Saclay, Fontenay aux Roses, France
| | - Zahra Kadri
- Division of Innovative Therapies, UMR E007, Institute of Biology François Jacob, CEA, Université Paris Sud, Université Paris-Saclay, Fontenay aux Roses, France
| | - Amandine Langelé
- Division of Innovative Therapies, UMR E007, Institute of Biology François Jacob, CEA, Université Paris Sud, Université Paris-Saclay, Fontenay aux Roses, France
| | - Sophie Luccantoni
- Immunology of Viral Infections and Autoimmune Diseases, IDMIT Department, Institute of Biology François Jacob, CEA - Université Paris Sud 11 - INSERM U1184, Fontenay-aux-Roses, France
| | - Cécile Badoual
- Department of Pathology, G. Pompidou European Hospital APHP - Université Paris, Descartes, Paris, France
| | - Philippe Leboulch
- Division of Innovative Therapies, UMR E007, Institute of Biology François Jacob, CEA, Université Paris Sud, Université Paris-Saclay, Fontenay aux Roses, France.,Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.,Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Stany Chrétien
- Division of Innovative Therapies, UMR E007, Institute of Biology François Jacob, CEA, Université Paris Sud, Université Paris-Saclay, Fontenay aux Roses, France.,INSERM, Paris, France
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9
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Single-cell analyses demonstrate that a heme-GATA1 feedback loop regulates red cell differentiation. Blood 2018; 133:457-469. [PMID: 30530752 DOI: 10.1182/blood-2018-05-850412] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 12/01/2018] [Indexed: 01/07/2023] Open
Abstract
Erythropoiesis is the complex, dynamic, and tightly regulated process that generates all mature red blood cells. To understand this process, we mapped the developmental trajectories of progenitors from wild-type, erythropoietin-treated, and Flvcr1-deleted mice at single-cell resolution. Importantly, we linked the quantity of each cell's surface proteins to its total transcriptome, which is a novel method. Deletion of Flvcr1 results in high levels of intracellular heme, allowing us to identify heme-regulated circuitry. Our studies demonstrate that in early erythroid cells (CD71+Ter119neg-lo), heme increases ribosomal protein transcripts, suggesting that heme, in addition to upregulating globin transcription and translation, guarantees ample ribosomes for globin synthesis. In later erythroid cells (CD71+Ter119lo-hi), heme decreases GATA1, GATA1-target gene, and mitotic spindle gene expression. These changes occur quickly. For example, in confirmatory studies using human marrow erythroid cells, ribosomal protein transcripts and proteins increase, and GATA1 transcript and protein decrease, within 15 to 30 minutes of amplifying endogenous heme synthesis with aminolevulinic acid. Because GATA1 initiates heme synthesis, GATA1 and heme together direct red cell maturation, and heme stops GATA1 synthesis, our observations reveal a GATA1-heme autoregulatory loop and implicate GATA1 and heme as the comaster regulators of the normal erythroid differentiation program. In addition, as excessive heme could amplify ribosomal protein imbalance, prematurely lower GATA1, and impede mitosis, these data may help explain the ineffective (early termination of) erythropoiesis in Diamond Blackfan anemia and del(5q) myelodysplasia, disorders with excessive heme in colony-forming unit-erythroid/proerythroblasts, explain why these anemias are macrocytic, and show why children with GATA1 mutations have DBA-like clinical phenotypes.
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10
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Jafari M, Ghadami E, Dadkhah T, Akhavan-Niaki H. PI3k/AKT signaling pathway: Erythropoiesis and beyond. J Cell Physiol 2018; 234:2373-2385. [PMID: 30192008 DOI: 10.1002/jcp.27262] [Citation(s) in RCA: 190] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 07/24/2018] [Indexed: 12/20/2022]
Abstract
Erythropoiesis is a multi-step process that involves the differentiation of hematopoietic stem cells into mature red blood cells (RBCs). This process is regulated by several signaling pathways, transcription factors and microRNAs (miRNAs). Many studies have shown that dysregulation of this process can lead to hematologic disorders. PI3K/AKT is one of the most important pathways that control many cellular processes including, cell division, autophagy, survival, and differentiation. In this review, we focus on the role of PI3K/AKT pathway in erythropoiesis and discuss the function of some of the most important genes, transcription factors, and miRNAs that regulate different stages of erythropoiesis which play roles in differentiation and maturation of RBCs, prevention of apoptosis, and autophagy induction. Understanding the role of the PI3K pathway in erythropoiesis may provide new insights into diagnosing erythrocyte disorders.
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Affiliation(s)
- Mahjoobeh Jafari
- Department of Genetics, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran
| | - Elham Ghadami
- Department of Genetics, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran
| | - Tahereh Dadkhah
- Department of Genetics, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran
| | - Haleh Akhavan-Niaki
- Department of Genetics, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran
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11
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Goupille O, Penglong T, Kadri Z, Granger-Locatelli M, Denis R, Luquet S, Badoual C, Fucharoen S, Maouche-Chrétien L, Leboulch P, Chrétien S. The LXCXE Retinoblastoma Protein-Binding Motif of FOG-2 Regulates Adipogenesis. Cell Rep 2018; 21:3524-3535. [PMID: 29262331 DOI: 10.1016/j.celrep.2017.11.098] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 10/12/2017] [Accepted: 11/28/2017] [Indexed: 02/08/2023] Open
Abstract
GATA transcription factors and their FOG cofactors play a key role in tissue-specific development and differentiation, from worms to humans. Mammals have six GATA and two FOG factors. We recently demonstrated that interactions between retinoblastoma protein (pRb) and GATA-1 are crucial for erythroid proliferation and differentiation. We show here that the LXCXE pRb-binding site of FOG-2 is involved in adipogenesis. Unlike GATA-1, which inhibits cell division, FOG-2 promotes proliferation. Mice with a knockin of a Fog2 gene bearing a mutated LXCXE pRb-binding site are resistant to obesity and display higher rates of white-to-brown fat conversion. Thus, each component of the GATA/FOG complex (GATA-1 and FOG-2) is involved in pRb/E2F regulation, but these molecules have markedly different roles in the control of tissue homeostasis.
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Affiliation(s)
- Olivier Goupille
- Service des Thérapies Innovantes, Institute Jacob, CEA 92265 Fontenay-aux-Roses and University Paris Saclay UMR-E007, 91405 Orsay Cedex, France
| | - Tipparat Penglong
- Service des Thérapies Innovantes, Institute Jacob, CEA 92265 Fontenay-aux-Roses and University Paris Saclay UMR-E007, 91405 Orsay Cedex, France; Thalassemia Research Center, Institute of Molecular Biosciences, Mahidol University, 73170 Nakhon Pathom, Thailand
| | - Zahra Kadri
- Service des Thérapies Innovantes, Institute Jacob, CEA 92265 Fontenay-aux-Roses and University Paris Saclay UMR-E007, 91405 Orsay Cedex, France
| | - Marine Granger-Locatelli
- Service des Thérapies Innovantes, Institute Jacob, CEA 92265 Fontenay-aux-Roses and University Paris Saclay UMR-E007, 91405 Orsay Cedex, France
| | - Raphaël Denis
- Unité de Biologie Fonctionnelle et Adaptative, Centre National la Recherche scientifique, UMR 8251, Université Paris Diderot, Sorbonne Paris Cité, 75205 Paris, France
| | - Serge Luquet
- Unité de Biologie Fonctionnelle et Adaptative, Centre National la Recherche scientifique, UMR 8251, Université Paris Diderot, Sorbonne Paris Cité, 75205 Paris, France
| | - Cécile Badoual
- Department of Pathology, G. Pompidou European Hospital APHP-Université Paris Descartes, Paris, France
| | - Suthat Fucharoen
- Thalassemia Research Center, Institute of Molecular Biosciences, Mahidol University, 73170 Nakhon Pathom, Thailand
| | - Leila Maouche-Chrétien
- Service des Thérapies Innovantes, Institute Jacob, CEA 92265 Fontenay-aux-Roses and University Paris Saclay UMR-E007, 91405 Orsay Cedex, France; INSERM, Paris, France
| | - Philippe Leboulch
- Service des Thérapies Innovantes, Institute Jacob, CEA 92265 Fontenay-aux-Roses and University Paris Saclay UMR-E007, 91405 Orsay Cedex, France; Thalassemia Research Center, Institute of Molecular Biosciences, Mahidol University, 73170 Nakhon Pathom, Thailand; Genetics Division, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02215, USA
| | - Stany Chrétien
- Service des Thérapies Innovantes, Institute Jacob, CEA 92265 Fontenay-aux-Roses and University Paris Saclay UMR-E007, 91405 Orsay Cedex, France; INSERM, Paris, France.
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12
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13
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Abstract
The discovery of the GATA binding protein (GATA factor) transcription factor family revolutionized hematology. Studies of GATA proteins have yielded vital contributions to our understanding of how hematopoietic stem and progenitor cells develop from precursors, how progenitors generate red blood cells, how hemoglobin synthesis is regulated, and the molecular underpinnings of nonmalignant and malignant hematologic disorders. This thrilling journey began with mechanistic studies on a β-globin enhancer- and promoter-binding factor, GATA-1, the founding member of the GATA family. This work ushered in the cloning of related proteins, GATA-2-6, with distinct and/or overlapping expression patterns. Herein, we discuss how the hematopoietic GATA factors (GATA-1-3) function via a battery of mechanistic permutations, which can be GATA factor subtype, cell type, and locus specific. Understanding this intriguing protein family requires consideration of how the mechanistic permutations are amalgamated into circuits to orchestrate processes of interest to the hematologist and more broadly.
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14
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Merryweather-Clarke AT, Tipping AJ, Lamikanra AA, Fa R, Abu-Jamous B, Tsang HP, Carpenter L, Robson KJH, Nandi AK, Roberts DJ. Distinct gene expression program dynamics during erythropoiesis from human induced pluripotent stem cells compared with adult and cord blood progenitors. BMC Genomics 2016; 17:817. [PMID: 27769165 PMCID: PMC5073849 DOI: 10.1186/s12864-016-3134-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 09/27/2016] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Human-induced pluripotent stem cells (hiPSCs) are a potentially invaluable resource for regenerative medicine, including the in vitro manufacture of blood products. HiPSC-derived red blood cells are an attractive therapeutic option in hematology, yet exhibit unexplained proliferation and enucleation defects that presently preclude such applications. We hypothesised that substantial differential regulation of gene expression during erythroid development accounts for these important differences between hiPSC-derived cells and those from adult or cord-blood progenitors. We thus cultured erythroblasts from each source for transcriptomic analysis to investigate differential gene expression underlying these functional defects. RESULTS Our high resolution transcriptional view of definitive erythropoiesis captures the regulation of genes relevant to cell-cycle control and confers statistical power to deploy novel bioinformatics methods. Whilst the dynamics of erythroid program elaboration from adult and cord blood progenitors were very similar, the emerging erythroid transcriptome in hiPSCs revealed radically different program elaboration compared to adult and cord blood cells. We explored the function of differentially expressed genes in hiPSC-specific clusters defined by our novel tunable clustering algorithms (SMART and Bi-CoPaM). HiPSCs show reduced expression of c-KIT and key erythroid transcription factors SOX6, MYB and BCL11A, strong HBZ-induction, and aberrant expression of genes involved in protein degradation, lysosomal clearance and cell-cycle regulation. CONCLUSIONS Together, these data suggest that hiPSC-derived cells may be specified to a primitive erythroid fate, and implies that definitive specification may more accurately reflect adult development. We have therefore identified, for the first time, distinct gene expression dynamics during erythroblast differentiation from hiPSCs which may cause reduced proliferation and enucleation of hiPSC-derived erythroid cells. The data suggest several mechanistic defects which may partially explain the observed aberrant erythroid differentiation from hiPSCs.
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Affiliation(s)
- Alison T Merryweather-Clarke
- Radcliffe Department of Medicine, University of Oxford, Headington, Oxford, OX3 9DU, UK.,National Health Service Blood and Transplant, John Radcliffe Hospital, Headington, Oxford, OX3 9BQ, UK
| | - Alex J Tipping
- Radcliffe Department of Medicine, University of Oxford, Headington, Oxford, OX3 9DU, UK.,National Health Service Blood and Transplant, John Radcliffe Hospital, Headington, Oxford, OX3 9BQ, UK
| | - Abigail A Lamikanra
- Radcliffe Department of Medicine, University of Oxford, Headington, Oxford, OX3 9DU, UK. .,National Health Service Blood and Transplant, John Radcliffe Hospital, Headington, Oxford, OX3 9BQ, UK.
| | - Rui Fa
- Department of Electronic and Computer Engineering, Brunel University London, Middlesex, UB8 3PH, UK
| | - Basel Abu-Jamous
- Department of Electronic and Computer Engineering, Brunel University London, Middlesex, UB8 3PH, UK
| | - Hoi Pat Tsang
- Radcliffe Department of Medicine, University of Oxford, Headington, Oxford, OX3 9DU, UK.,National Health Service Blood and Transplant, John Radcliffe Hospital, Headington, Oxford, OX3 9BQ, UK
| | - Lee Carpenter
- Radcliffe Department of Medicine, University of Oxford, Headington, Oxford, OX3 9DU, UK.,National Health Service Blood and Transplant, John Radcliffe Hospital, Headington, Oxford, OX3 9BQ, UK
| | - Kathryn J H Robson
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, Headington, OX3 9DU, Oxford, UK
| | - Asoke K Nandi
- Department of Electronic and Computer Engineering, Brunel University London, Middlesex, UB8 3PH, UK.,Distinguished Visiting Professor, The Key Laboratory of Embedded Systems and Service Computing, College of Electronic and Information Engineering, Tongji University, Shanghai, People's Republic of China
| | - David J Roberts
- Radcliffe Department of Medicine, University of Oxford, Headington, Oxford, OX3 9DU, UK. .,National Health Service Blood and Transplant, John Radcliffe Hospital, Headington, Oxford, OX3 9BQ, UK.
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15
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Chen YQ, Zhao J, Jin CW, Li YH, Tang MX, Wang ZH, Zhang W, Zhang Y, Li L, Zhong M. Testosterone delays vascular smooth muscle cell senescence and inhibits collagen synthesis via the Gas6/Axl signaling pathway. AGE (DORDRECHT, NETHERLANDS) 2016; 38:60. [PMID: 27206970 PMCID: PMC5005950 DOI: 10.1007/s11357-016-9910-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Accepted: 03/29/2016] [Indexed: 06/05/2023]
Abstract
Testosterone deficiency is associated with a higher incidence of cardiovascular diseases in men. However, its effect on cell senescence, which plays a causal role in vascular aging, remains unclear. Here, we tested the hypothesis that testosterone alleviated vascular smooth muscle cell (VSMC) senescence and collagen synthesis via growth arrest-specific protein 6 (Gas6)/Axl- and Akt/FoxO1a-dependent pathways. Testosterone significantly ameliorated angiotensin II-induced VSMC senescence and collagen overexpression. In addition, testosterone inhibited angiotensin II-induced matrix metalloproteinase-2 (MMP-2) activity, which played a pivotal role in facilitating age-related collagen deposition. Testosterone increased the expression of tissue inhibitor of metalloproteinase-2 but decreased the expression of MMP-2 and membrane type-1 metalloproteinase which contributed to increase MMP-2 activity. The effects on VSMCs senescence and collagen synthesis were mediated by restoration of angiotensin II-induced downregulation of Gas6 and Axl expression and a subsequent reduction of Akt and FoxO1a phosphorylation. The effects of testosterone were reversed by a Gas6 blocker, Axl-Fc, and a specific inhibitor of Axl, R428. Treatment of VSMCs with PI3K inhibitor LY294002 abrogated the downregulating effect of testosterone on MMP-2 activity. Furthermore, when FoxO1a expression was silenced by using a specific siRNA, the inhibitory effect of testosterone on MMP-2 activity was revered as well, that indicated this process was Akt/FoxO1a dependence. Taken together, Gas6/Axl and Akt/FoxO1a were involved in protective effects of testosterone on VSMCs senescence and collagen synthesis. Our results provide a novel mechanism underlying the protective effect of testosterone on vascular aging and may serve as a theoretical basis for testosterone replacement therapy.
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MESH Headings
- Aging/genetics
- Androgens/pharmacology
- Animals
- Apoptosis
- Blotting, Western
- Cattle
- Cells, Cultured
- Cellular Senescence
- Collagen/antagonists & inhibitors
- Collagen/biosynthesis
- DNA/genetics
- Enzyme-Linked Immunosorbent Assay
- Gene Expression Regulation, Developmental
- Intercellular Signaling Peptides and Proteins/biosynthesis
- Intercellular Signaling Peptides and Proteins/genetics
- Male
- Mice
- Mice, Inbred C57BL
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Polymerase Chain Reaction
- Proto-Oncogene Proteins/biosynthesis
- Proto-Oncogene Proteins/genetics
- Receptor Protein-Tyrosine Kinases/biosynthesis
- Receptor Protein-Tyrosine Kinases/genetics
- Signal Transduction/drug effects
- Testosterone/pharmacology
- Axl Receptor Tyrosine Kinase
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Affiliation(s)
- Yan-qing Chen
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
| | - Jing Zhao
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
| | - Cheng-wei Jin
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
- Department of Cardiology, Central Hospital of Zibo, Zibo, People's Republic of China
| | - Yi-hui Li
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
| | - Meng-xiong Tang
- The Department of Emergency Medicine, Qilu Hospital of Shandong University, Ji'nan, People's Republic of China
| | - Zhi-hao Wang
- Department of Geriatrics, Qilu Hospital of Shandong University, Ji'nan, People's Republic of China
| | - Wei Zhang
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
| | - Yun Zhang
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
| | - Li Li
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China.
| | - Ming Zhong
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China.
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16
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Lv B, Song C, Wu L, Zhang Q, Hou D, Chen P, Yu S, Wang Z, Chu Y, Zhang J, Yang D, Liu J. Netrin-4 as a biomarker promotes cell proliferation and invasion in gastric cancer. Oncotarget 2016; 6:9794-806. [PMID: 25909166 PMCID: PMC4496398 DOI: 10.18632/oncotarget.3400] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 02/15/2015] [Indexed: 12/28/2022] Open
Abstract
Gastric cancer (GC) is the second most common cause of cancer-related death with limited serum biomarkers for diagnosis and prognosis. Netrin-4 (Ntn4) is a laminin-related secreted molecule found to regulate tumor progression and metastasis. However, it is completely unknown whether Ntn4 has roles in GC development. Here, we first reported Ntn4 knockdown significantly suppressed cell proliferation and motility, while overexpression or addition of exogenous Ntn4 reversed these effects. In addition, Ntn4 receptor, neogenin (Neo) was also found highly expressed in GC cells and mediated the Ntn4-induced cell proliferation and invasion. Moreover, Ntn4 or Neo silencing decreased the phosphorylation of Stat3, ERK, Akt and p38, indicating multi-oncogenic pathways (Jak/Stat, PI3K/Akt, and ERK/MAPK) were involved in Ntn4-induced effects on the GC cells. Importantly, Ntn4 level was significantly increased in 82 tumor tissues (p = 0.001) and 52 serum samples (p < 0.0001) from GC patients and positively correlated with Neo expression (p = 0.003). Ntn4 expression was negatively correlated with the survival period (p = 0.038), and positively associated with the severity of pathological stages of the tumors (p = 0.008). Taken together, Ntn4 promoted the proliferation and motility of GC cells which was mediated by its receptor Neo and through further activation of multi-oncogenic pathways. Elevated Ntn4 was detected in both tumor tissues and serum samples of GC patients and suggested a relatively poor survival, indicating Ntn4 may be used as a potential non-invasive biomarker for diagnosis and prognosis of GC.
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Affiliation(s)
- Bin Lv
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai, China
| | - Chunhua Song
- Department of Pediatrics, Pennsylvania State University College of Medicine, Hershey, PA, USA
| | - Lijun Wu
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai, China
| | - Qi Zhang
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai, China.,Institutes of Biomedical Sciences of Shanghai Medical School, Fudan University, Shanghai, China
| | - Daisen Hou
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai, China.,Institutes of Biomedical Sciences of Shanghai Medical School, Fudan University, Shanghai, China
| | - Ping Chen
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai, China.,Institutes of Biomedical Sciences of Shanghai Medical School, Fudan University, Shanghai, China
| | - Shunji Yu
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai, China.,Institutes of Biomedical Sciences of Shanghai Medical School, Fudan University, Shanghai, China
| | - Zhicheng Wang
- Department of Laboratory Medicine of Huashan Hospital, Fudan University, Shanghai, China
| | - Yiwei Chu
- Department of Immunology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Jun Zhang
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai, China
| | - Dongqin Yang
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai, China
| | - Jie Liu
- Department of Digestive Diseases of Huashan Hospital, Fudan University, Shanghai, China
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17
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Kadri Z, Lefevre C, Goupille O, Penglong T, Granger-Locatelli M, Fucharoen S, Maouche-Chretien L, Leboulch P, Chretien S. Erythropoietin and IGF-1 signaling synchronize cell proliferation and maturation during erythropoiesis. Genes Dev 2016; 29:2603-16. [PMID: 26680303 PMCID: PMC4699388 DOI: 10.1101/gad.267633.115] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Kadri et al. show that erythropoietin activates AKT, which phosphorylates GATA-1 at Ser310, thereby increasing GATA-1 affinity for FOG-1. In turn, FOG-1 displaces pRb/E2F-2 from GATA-1, ultimately releasing free, proproliferative E2F-2. Mice bearing a GATA-1S310A mutation suffer from fatal anemia when a compensatory pathway for E2F-2 production involving IGF-1 signaling is simultaneously abolished. Tight coordination of cell proliferation and differentiation is central to red blood cell formation. Erythropoietin controls the proliferation and survival of red blood cell precursors, while variations in GATA-1/FOG-1 complex composition and concentrations drive their maturation. However, clear evidence of cross-talk between molecular pathways is lacking. Here, we show that erythropoietin activates AKT, which phosphorylates GATA-1 at Ser310, thereby increasing GATA-1 affinity for FOG-1. In turn, FOG-1 displaces pRb/E2F-2 from GATA-1, ultimately releasing free, proproliferative E2F-2. Mice bearing a Gata-1S310A mutation suffer from fatal anemia when a compensatory pathway for E2F-2 production involving insulin-like growth factor-1 (IGF-1) signaling is simultaneously abolished. In the context of the GATA-1V205G mutation resulting in lethal anemia, we show that the Ser310 cannot be phosphorylated and that constitutive phosphorylation at this position restores partial erythroid differentiation. This study sheds light on the GATA-1 pathways that synchronize cell proliferation and differentiation for tissue homeostasis.
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Affiliation(s)
- Zahra Kadri
- Commissariat à l'Energie Atomique et aux Énergies Alternatives, Institute of Emerging Diseases and Innovative Therapies (iMETI), 92265 Fontenay-aux-Roses, France; UMR-E 007, Université Paris-Saclay, 91400 Orsay, France
| | - Carine Lefevre
- Commissariat à l'Energie Atomique et aux Énergies Alternatives, Institute of Emerging Diseases and Innovative Therapies (iMETI), 92265 Fontenay-aux-Roses, France; UMR-E 007, Université Paris-Saclay, 91400 Orsay, France
| | - Olivier Goupille
- Commissariat à l'Energie Atomique et aux Énergies Alternatives, Institute of Emerging Diseases and Innovative Therapies (iMETI), 92265 Fontenay-aux-Roses, France; UMR-E 007, Université Paris-Saclay, 91400 Orsay, France
| | - Tipparat Penglong
- Commissariat à l'Energie Atomique et aux Énergies Alternatives, Institute of Emerging Diseases and Innovative Therapies (iMETI), 92265 Fontenay-aux-Roses, France; UMR-E 007, Université Paris-Saclay, 91400 Orsay, France; Thalassemia Research Center, Institute of Molecular Biosciences, Mahidol University, 73170 Nakhon Pathom, Thailand
| | - Marine Granger-Locatelli
- Commissariat à l'Energie Atomique et aux Énergies Alternatives, Institute of Emerging Diseases and Innovative Therapies (iMETI), 92265 Fontenay-aux-Roses, France; UMR-E 007, Université Paris-Saclay, 91400 Orsay, France
| | - Suthat Fucharoen
- Thalassemia Research Center, Institute of Molecular Biosciences, Mahidol University, 73170 Nakhon Pathom, Thailand
| | - Leila Maouche-Chretien
- Commissariat à l'Energie Atomique et aux Énergies Alternatives, Institute of Emerging Diseases and Innovative Therapies (iMETI), 92265 Fontenay-aux-Roses, France; UMR-E 007, Université Paris-Saclay, 91400 Orsay, France; Institut National de la Santé et de la Recherche Médicale, 75013 Paris, France
| | - Philippe Leboulch
- Commissariat à l'Energie Atomique et aux Énergies Alternatives, Institute of Emerging Diseases and Innovative Therapies (iMETI), 92265 Fontenay-aux-Roses, France; UMR-E 007, Université Paris-Saclay, 91400 Orsay, France; Thalassemia Research Center, Institute of Molecular Biosciences, Mahidol University, 73170 Nakhon Pathom, Thailand; Genetics Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02215, USA
| | - Stany Chretien
- Commissariat à l'Energie Atomique et aux Énergies Alternatives, Institute of Emerging Diseases and Innovative Therapies (iMETI), 92265 Fontenay-aux-Roses, France; UMR-E 007, Université Paris-Saclay, 91400 Orsay, France; Institut National de la Santé et de la Recherche Médicale, 75013 Paris, France
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18
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Akt1-mediated Gata3 phosphorylation controls the repression of IFNγ in memory-type Th2 cells. Nat Commun 2016; 7:11289. [PMID: 27053161 PMCID: PMC4829694 DOI: 10.1038/ncomms11289] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 03/09/2016] [Indexed: 12/21/2022] Open
Abstract
Th2 cells produce Th2 cytokines such as IL-4, IL-5 and IL-13, but repress Th1 cytokine IFNγ. Recent studies have revealed various distinct memory-type Th2 cell subsets, one of which produces a substantial amount of IFNγ in addition to Th2 cytokines, however it remains unclear precisely how these Th2 cells produce IFNγ. We herein show that phosphorylation of Gata3 at Ser308, Thr315 and Ser316 induces dissociation of a histone deacetylase Hdac2 from the Gata3/Chd4 repressive complex in Th2 cells. We also identify Akt1 as a Gata3-phosphorylating kinase, and the activation of Akt1 induces derepression of Tbx21 and Ifng expression in Th2 cells. Moreover, T-bet-dependent IFNγ expression in IFNγ-producing memory Th2 cells appears to be controlled by the phosphorylation status of Gata3 in human and murine systems. Thus, this study highlights the molecular basis for posttranslational modifications of Gata3 that control the regulation of IFNγ expression in memory Th2 cells.
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DeVilbiss AW, Tanimura N, McIver SC, Katsumura KR, Johnson KD, Bresnick EH. Navigating Transcriptional Coregulator Ensembles to Establish Genetic Networks: A GATA Factor Perspective. Curr Top Dev Biol 2016; 118:205-44. [PMID: 27137658 DOI: 10.1016/bs.ctdb.2016.01.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Complex developmental programs require orchestration of intrinsic and extrinsic signals to control cell proliferation, differentiation, and survival. Master regulatory transcription factors are vital components of the machinery that transduce these stimuli into cellular responses. This is exemplified by the GATA family of transcription factors that establish cell type-specific genetic networks and control the development and homeostasis of systems including blood, vascular, adipose, and cardiac. Dysregulated GATA factor activity/expression underlies anemia, immunodeficiency, myelodysplastic syndrome, and leukemia. Parameters governing the capacity of a GATA factor expressed in multiple cell types to generate cell type-specific transcriptomes include selective coregulator usage and target gene-specific chromatin states. As knowledge of GATA-1 mechanisms in erythroid cells constitutes a solid foundation, we will focus predominantly on GATA-1, while highlighting principles that can be extrapolated to other master regulators. GATA-1 interacts with ubiquitous and lineage-restricted transcription factors, chromatin modifying/remodeling enzymes, and other coregulators to activate or repress transcription and to maintain preexisting transcriptional states. Major unresolved issues include: how does a GATA factor selectively utilize diverse coregulators; do distinct epigenetic landscapes and nuclear microenvironments of target genes dictate coregulator requirements; and do gene cohorts controlled by a common coregulator ensemble function in common pathways. This review will consider these issues in the context of GATA factor-regulated hematopoiesis and from a broader perspective.
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Affiliation(s)
- A W DeVilbiss
- UW-Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States; UW-Madison Blood Research Program, Madison, WI, United States
| | - N Tanimura
- UW-Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States; UW-Madison Blood Research Program, Madison, WI, United States
| | - S C McIver
- UW-Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States; UW-Madison Blood Research Program, Madison, WI, United States
| | - K R Katsumura
- UW-Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States; UW-Madison Blood Research Program, Madison, WI, United States
| | - K D Johnson
- UW-Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States; UW-Madison Blood Research Program, Madison, WI, United States
| | - E H Bresnick
- UW-Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States; UW-Madison Blood Research Program, Madison, WI, United States.
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Li Y, Ke Q, Shao Y, Zhu G, Li Y, Geng N, Jin F, Li F. GATA1 induces epithelial-mesenchymal transition in breast cancer cells through PAK5 oncogenic signaling. Oncotarget 2015; 6:4345-56. [PMID: 25726523 PMCID: PMC4414194 DOI: 10.18632/oncotarget.2999] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Accepted: 12/21/2014] [Indexed: 11/25/2022] Open
Abstract
Epithelial-mesenchymal transition (EMT) is a key process in tumor metastatic cascade that is characterized by the loss of cell-cell junctions, resulting in the acquisition of migratory and invasive properties. E-cadherin is a major component of intercellular junctions and the reduction or loss of its expression is a hallmark of EMT. Transcription factor GATA1 has a critical anti-apoptotic role in breast cancer, but its function for metastasis has not been investigated. Here, we found that GATA1, as a novel E-cadherin repressor, promotes EMT in breast cancer cells. GATA1 binds to E-cadherin promoter, down-regulates E-cadherin expression, disrupts intercellular junction and promotes metastasis of breast cancer cell in vivo. Moreover, GATA1 is a new substrate of p21-activated kinase 5 (PAK5), which is phosphorylated on serine 161 and 187 (S161 and S187). GATA1 recruits HDAC3/4 to E-cadherin promoter, which is reduced by GATA1 S161A S187A mutant. These data indicate that phosphorylated GATA1 recruits more HDAC3/4 to promote transcriptional repression of E-cadherin, leading to the EMT of breast cancer cells. Our findings provide insights into the novel function of GATA1, contributing to a better understanding of the EMT, indicating that GATA1 and its phosphorylation may play an important role in the metastasis of breast cancer.
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Affiliation(s)
- Yang Li
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China
| | - Qiang Ke
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China
| | - Yangguang Shao
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China
| | - Ge Zhu
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China
| | - Yanshu Li
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China
| | - Nanxi Geng
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China
| | - Feng Jin
- Department of Breast Surgery, Department of Surgical Oncology, Research Unit of General Surgery, The First Affiliated Hospital of China Medical University, Shenyang, China
| | - Feng Li
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China
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Matsunaga H, Sasaki S, Suzuki S, Matsushita A, Nakamura H, Nakamura HM, Hirahara N, Kuroda G, Iwaki H, Ohba K, Morita H, Oki Y, Suda T. Essential Role of GATA2 in the Negative Regulation of Type 2 Deiodinase Gene by Liganded Thyroid Hormone Receptor β2 in Thyrotroph. PLoS One 2015; 10:e0142400. [PMID: 26571013 PMCID: PMC4646574 DOI: 10.1371/journal.pone.0142400] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 10/21/2015] [Indexed: 12/30/2022] Open
Abstract
The inhibition of thyrotropin (thyroid stimulating hormone; TSH) by thyroid hormone (T3) and its receptor (TR) is the central mechanism of the hypothalamus-pituitary-thyroid axis. Two transcription factors, GATA2 and Pit-1, determine thyrotroph differentiation and maintain the expression of the β subunit of TSH (TSHβ). We previously reported that T3-dependent repression of the TSHβ gene is mediated by GATA2 but not by the reported negative T3-responsive element (nTRE). In thyrotrophs, T3 also represses mRNA of the type-2 deiodinase (D2) gene, where no nTRE has been identified. Here, the human D2 promoter fused to the CAT or modified Renilla luciferase gene was co-transfected with Pit-1 and/or GATA2 expression plasmids into cell lines including CV1 and thyrotroph-derived TαT1. GATA2 but not Pit-1 activated the D2 promoter. Two GATA responsive elements (GATA-REs) were identified close to cAMP responsive element. The protein kinase A activator, forskolin, synergistically enhanced GATA2-dependent activity. Gel-shift and chromatin immunoprecipitation assays with TαT1 cells indicated that GATA2 binds to these GATA-REs. T3 repressed the GATA2-induced activity of the D2 promoter in the presence of the pituitary-specific TR, TRβ2. The inhibition by T3-bound TRβ2 was dominant over the synergism between GATA2 and forskolin. The D2 promoter is also stimulated by GATA4, the major GATA in cardiomyocytes, and this activity was repressed by T3 in the presence of TRα1. These data indicate that the GATA-induced activity of the D2 promoter is suppressed by T3-bound TRs via a tethering mechanism, as in the case of the TSHβ gene.
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Affiliation(s)
- Hideyuki Matsunaga
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431–3192, Japan
| | - Shigekazu Sasaki
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431–3192, Japan
| | - Shingo Suzuki
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431–3192, Japan
| | - Akio Matsushita
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431–3192, Japan
| | - Hirotoshi Nakamura
- Kuma Hospital, 8-2-35 Shimoyamate-dori, Chuo-ku, Kobe, Hyogo, 650–0011, Japan
| | - Hiroko Misawa Nakamura
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431–3192, Japan
| | - Naoko Hirahara
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431–3192, Japan
| | - Go Kuroda
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431–3192, Japan
| | - Hiroyuki Iwaki
- Division of Endocrinology, Seirei Hamamatsu General Hospital, 2-12-12 Sumiyoshi, Naka-ku, Hamamatsu, Shizuoka, 430–0906, Japan
| | - Kenji Ohba
- Duke-NUS Graduate Medical School Singapore, No 8 College Road, Level 8th, 169857, Singapore
| | - Hiroshi Morita
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431–3192, Japan
| | - Yutaka Oki
- Department of Family and Community Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431–3192, Japan
| | - Takafumi Suda
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431–3192, Japan
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Xue G, Zippelius A, Wicki A, Mandala M, Tang F, Massi D, Hemmings BA. Integrated Akt/PKB Signaling in Immunomodulation and Its Potential Role in Cancer Immunotherapy. J Natl Cancer Inst 2015; 107:djv171. [DOI: 10.1093/jnci/djv171] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 05/22/2015] [Indexed: 12/17/2022] Open
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Lengyel JNG, Park EY, Brunson AR, Pinali D, Lane MA. Phosphatidylinositol 3-kinase mediates the ability of retinol to decrease colorectal cancer cell invasion. Nutr Cancer 2014; 66:1352-61. [PMID: 25356626 DOI: 10.1080/01635581.2014.956258] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Previously, we showed that retinol (vitamin A) decreased both colorectal cancer cell invasion and phosphatidylinositol 3-kinase (PI3K) activity through a retinoic acid receptor-independent mechanism. Here, we determined if these phenomena were related by using parental HCT-116 cells that harbor 1 allele of wild-type PI3K and 1 allele of constitutively active (ca) PI3K and 2 mutant HCT-116 cell lines homozygous for caPI3K. In vitro, treatment of parental HCT-116 cells with 10 μM retinol reduced cell invasion whereas treatment of mutant HCT-116 cell lines with retinol did not. Treatment with 10 μM retinol also decreased the activity of matrixmetalloproteinase-9 and increased tissue inhibitor of matrixmetalloproteinase-I levels in parental, but not mutant, HCT-116 cells. Finally, parental or mutant cells were intrasplenically injected into athymic mice consuming diets with or without supplemental vitamin A. As expected, vitamin A supplementation tended (P = 0.18) to reduce the incidence of metastases in mice injected with the parental cell line and consuming the supplemented diet. In contrast, metastatic incidence was not affected (P = 1.00) by vitamin A supplementation in mice injected with mutant cells. These data indicate that the capacity of retinol to inhibit PI3K activity confers its ability to decrease colorectal cancer metastasis.
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Affiliation(s)
- Jennifer N Griffin Lengyel
- a School of Family and Consumer Sciences, Nutrition and Foods Program , Texas State University-San Marcos , San Marcos , Texas , USA
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Wang R, Wu X, Liang J, Qi Z, Liu X, Min L, Ji X, Luo Y, Zhao H. Intra-artery infusion of recombinant human erythropoietin reduces blood-brain barrier disruption in rats following cerebral ischemia and reperfusion. Int J Neurosci 2014; 125:693-702. [PMID: 25226558 DOI: 10.3109/00207454.2014.966354] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVES Intra-artery infusion of recombinant human erythropoietin (rhEPO) has recently been reported to confer neuroprotection against cerebral ischemia-reperfusion injury in animal models; however, the molecular mechanisms are still under investigation. The present study focused on the specific mechanism involved in blood-brain barrier (BBB) disruption. METHODS Thirty-six male and nine female Sprague Dawley rats were subjected to middle cerebral artery (MCA) occlusion to induce focal cerebral ischemia, and administrated rhEPO at a dose of 800 U/kg through MCA infusion at the beginning of reperfusion. Neurobehavioral deficits, brain edema, and infarct volume were evaluated after 2 h of ischemia and 24 h of reperfusion. BBB permeability was assessed by quantifying the extravasation of Evans blue (EB) dye. The expression of tight junction proteins and matrix metalloproteinases (MMPs) (Claudin-5, Occludin, MMP-2, and MMP-9) in microvessels were detected by immunofluorescence and western blot. The activities of MMPs in the cerebral microvessels were determined by gelatin zymography. RESULTS Treatment with rhEPO through the MCA strongly alleviated infarct volume, brain edema, and improved neurobehavioral outcomes in male and female rats. In addition, rhEPO remarkably suppressed the EB extravasation induced by brain ischemia. Furthermore, rhEPO prevented degradation of Claudin-5 and Occludin, and reduced the expression and activity of MMP-2 and MMP-9 in isolated brain microvessels. CONCLUSIONS Treatment with rhEPO through MCA infusion prevented brain edema formation and infarction through inhibition of MMP-mediated BBB disruption in acute ischemic stroke.
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Affiliation(s)
- Rongliang Wang
- 1Cerebrovascular Diseases Research Institute, Xuanwu Hospital of Capital Medical University, Beijing, China
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Zhang X, Campreciós G, Rimmelé P, Liang R, Yalcin S, Mungamuri SK, Barminko J, D'Escamard V, Baron MH, Brugnara C, Papatsenko D, Rivella S, Ghaffari S. FOXO3-mTOR metabolic cooperation in the regulation of erythroid cell maturation and homeostasis. Am J Hematol 2014; 89:954-63. [PMID: 24966026 DOI: 10.1002/ajh.23786] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2014] [Accepted: 06/11/2014] [Indexed: 12/24/2022]
Abstract
Ineffective erythropoiesis is observed in many erythroid disorders including β-thalassemia and anemia of chronic disease in which increased production of erythroblasts that fail to mature exacerbate the underlying anemias. As loss of the transcription factor FOXO3 results in erythroblast abnormalities similar to the ones observed in ineffective erythropoiesis, we investigated the underlying mechanisms of the defective Foxo3(-/-) erythroblast cell cycle and maturation. Here we show that loss of Foxo3 results in overactivation of the JAK2/AKT/mTOR signaling pathway in primary bone marrow erythroblasts partly mediated by redox modulation. We further show that hyperactivation of mTOR signaling interferes with cell cycle progression in Foxo3 mutant erythroblasts. Importantly, inhibition of mTOR signaling, in vivo or in vitro enhances significantly Foxo3 mutant erythroid cell maturation. Similarly, in vivo inhibition of mTOR remarkably improves erythroid cell maturation and anemia in a model of β-thalassemia. Finally we show that FOXO3 and mTOR are likely part of a larger metabolic network in erythroblasts as together they control the expression of an array of metabolic genes some of which are implicated in erythroid disorders. These combined findings indicate that a metabolism-mediated regulatory network centered by FOXO3 and mTOR control the balanced production and maturation of erythroid cells. They also highlight physiological interactions between these proteins in regulating erythroblast energy. Our results indicate that alteration in the function of this network might be implicated in the pathogenesis of ineffective erythropoiesis.
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Affiliation(s)
- Xin Zhang
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
| | - Genís Campreciós
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
| | - Pauline Rimmelé
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
| | - Raymond Liang
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
- Developmental and Stem Cell Biology Multidisciplinary Training Area; Icahn School of Medicine at Mount Sinai; New York New York 10029
| | - Safak Yalcin
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
| | - Sathish Kumar Mungamuri
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
| | - Jeffrey Barminko
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
- Division of Hematology and Medical Oncology; Department of Medicine; Icahn School of Medicine at Mount Sinai; New York New York 10029
| | - Valentina D'Escamard
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
| | - Margaret H. Baron
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
- Developmental and Stem Cell Biology Multidisciplinary Training Area; Icahn School of Medicine at Mount Sinai; New York New York 10029
- Division of Hematology and Medical Oncology; Department of Medicine; Icahn School of Medicine at Mount Sinai; New York New York 10029
- Departments of Pediatrics Hematology-Oncology and Cell and Developmental Biology; Weill Cornell Medical College; New York New York 10021
- Tisch Cancer Institute; Icahn School of Medicine at Mount Sinai; New York New York 10029. Department of Oncological Sciences; Icahn School of Medicine at Mount Sinai; New York New York 10029
| | - Carlo Brugnara
- Department of Lab Medicine; Children's Hospital; Boston Massachusetts 02115
| | - Dmitri Papatsenko
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
- Black Family Stem Cell Institute; Icahn School of Medicine at Mount Sinai; New York New York 10029
| | - Stefano Rivella
- Departments of Pediatrics Hematology-Oncology and Cell and Developmental Biology; Weill Cornell Medical College; New York New York 10021
| | - Saghi Ghaffari
- Department of Developmental and Regenerative Biology; Icahn School of Medicine at Mount Sinai; New York New York 10029
- Developmental and Stem Cell Biology Multidisciplinary Training Area; Icahn School of Medicine at Mount Sinai; New York New York 10029
- Division of Hematology and Medical Oncology; Department of Medicine; Icahn School of Medicine at Mount Sinai; New York New York 10029
- Tisch Cancer Institute; Icahn School of Medicine at Mount Sinai; New York New York 10029
- Black Family Stem Cell Institute; Icahn School of Medicine at Mount Sinai; New York New York 10029
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Roy A, Haldar S, Basak NP, Banerjee S. Molecular cross talk between Notch1, Shh and Akt pathways during erythroid differentiation of K562 and HEL cell lines. Exp Cell Res 2013; 320:69-78. [PMID: 24095799 DOI: 10.1016/j.yexcr.2013.09.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 09/04/2013] [Accepted: 09/26/2013] [Indexed: 11/20/2022]
Abstract
Erythropoiesis is a tightly regulated process dependent on extrinsic signals conveyed by the bone marrow niche. The signalling pathways thus activated or repressed do not act in isolation; rather an intricate cross talk among these pathways ensues homoeostasis within the erythroid compartment. In this study, we describe the effects of two such signalling pathways namely the Notch1 and the Shh pathway on erythropoiesis in immortalised K562 and HEL cell lines as well as the cross talk that ensues between them. We show that while activation of the Notch1 pathway inhibits differentiation of erythroid lineage cell lines as well as in in-vitro primary erythroid cultures from the human CD34(+) cells; Shh pathway favours erythroid differentiation. Further, the Notch1 pathway activates the Akt pathway and constitutively active Akt partially mimics the effect of Notch1 activation on erythropoiesis. Moreover, the Notch1, Akt and Shh pathways were found to cross talk with each other. In this process, activation of Notch1 was found to down regulate the Shh pathway independent of Akt activation. Significantly, Notch1 not only down regulated the Shh pathway, but also inhibited recombinant Shh mediated erythropoiesis. Our study thus reveals an intricate crosstalk among the Notch1, Shh and Akt pathways wherein Notch1 emerges as a key regulator of erythropoiesis.
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Affiliation(s)
- Anita Roy
- Structural Genomics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata-700064, India
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Katsumura KR, DeVilbiss AW, Pope NJ, Johnson KD, Bresnick EH. Transcriptional mechanisms underlying hemoglobin synthesis. Cold Spring Harb Perspect Med 2013; 3:a015412. [PMID: 23838521 PMCID: PMC3753722 DOI: 10.1101/cshperspect.a015412] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The physiological switch in expression of the embryonic, fetal, and adult β-like globin genes has garnered enormous attention from investigators interested in transcriptional mechanisms and the molecular basis of hemoglobinopathies. These efforts have led to the discovery of cell type-specific transcription factors, unprecedented mechanisms of transcriptional coregulator function, genome biology principles, unique contributions of nuclear organization to transcription and cell function, and promising therapeutic targets. Given the vast literature accrued on this topic, this article will focus on the master regulator of erythroid cell development and function GATA-1, its associated proteins, and its frontline role in controlling hemoglobin synthesis. GATA-1 is a crucial regulator of genes encoding hemoglobin subunits and heme biosynthetic enzymes. GATA-1-dependent mechanisms constitute an essential regulatory core that nucleates additional mechanisms to achieve the physiological control of hemoglobin synthesis.
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Affiliation(s)
- Koichi R Katsumura
- Department of Cell and Regenerative Biology, UW-Madison Blood Research Program, Wisconsin Institute for Medical Research, Carbone Cancer Center, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin 53705
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Constitutive phosphorylation of GATA-1 at serine²⁶ attenuates the colony-forming activity of erythrocyte-committed progenitors. PLoS One 2013; 8:e64269. [PMID: 23717580 PMCID: PMC3661471 DOI: 10.1371/journal.pone.0064269] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Accepted: 04/09/2013] [Indexed: 11/30/2022] Open
Abstract
We previously reported that IL-3 signaling induces phosphorylation of GATA-1 at the serine26 position, which contributes to IL-3-mediated anti-apoptotic response. Here, we demonstrate that phosphorylation of GATA-1 at serine26 is also transiently induced in cells of the erythroid lineage (primary erythroblasts and erythrocyte-committed progenitors [EPs]) by erythropoietin (EPO), the principal cytokine regulating erythropoiesis. To examine whether phosphorylation of GATA-1 at serine26 would have any impact on erythropoiesis, mutant mice carrying either a glutamic acid (GATA-1S26E) or alanine (GATA-1S26A) substitution at serine26 were generated. Neither GATA-1S26E nor GATA-1S26A mice showed any significant difference from control mice in peripheral blood cell composition under either steady state or stress conditions. The erythroblast differentiation in both mutant mice also appeared to be normal. However, a moderate reduction in the CFU-E progenitor population was consistently observed in the bone marrow of GATA-1S26E, but not GATA-1S26A mice, suggesting that such defect was compensated for within the bone marrow. Surprisingly, reduced CFU-E progenitor population in GATA-1S26E mice was mainly due to EPO-induced growth suppression of GATA-1S26E EPs, albeit in the absence of EPO these cells manifested a survival advantage. Further analyses revealed that EPO-induced growth suppression of GATA-1S26E EPs was largely due to the proliferation block resulted from GATA-1S26E-mediated transcriptional activation of the gene encoding the cell cycle inhibitor p21Waf1/Cip1. Taken together, these results suggest that EPO-induced transient phosphorylation of GATA-1 at serine26 is dispensable for erythropoiesis. However, failure to dephosphorylate this residue following its transient phosphorylation significantly attenuates the colony-forming activity of EPs.
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Rahim F, Allahmoradi H, Salari F, Shahjahani M, Fard AD, Hosseini SA, Mousakhani H. Evaluation of Signaling Pathways Involved in γ-Globin Gene Induction Using Fetal Hemoglobin Inducer Drugs. Int J Hematol Oncol Stem Cell Res 2013; 7:41-6. [PMID: 24505534 PMCID: PMC3913148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Accepted: 06/15/2013] [Indexed: 11/08/2022] Open
Abstract
Potent induction of fetal hemoglobin (HbF) production results in alleviating the complications of β-thalassemia and sickle cell disease (SCD). HbF inducer agents can trigger several molecular signaling pathways critical for erythropoiesis. Janus kinase/Signal transducer and activator of transcription (JAK/STAT), mitogen activated protein kinas (MAPK) and Phosphoinositide 3-kinase (PI3K) are considered as main signaling pathways, which may play a significant role in HbF induction. All these signaling pathways are triggered by erythropoietin (EPO) as the main growth factor inducing erythroid differentiation, when it binds to its cell surface receptor, erythropoietin receptor (EPO-R) HbF inducer agents have been shown to upregulate HbF production level by triggering certain signaling pathways. As a result, understanding the pivotal signaling pathways influencing HbF induction leads to effective upregulation of HbF. In this mini review article, we try to consider the correlation between HbF inducer agents and their molecular mechanisms of γ-globin upregulation. Several studies suggest that activating P38 MAPK, RAS and STAT5 signaling pathways result in efficient HbF induction. Nevertheless, the role of other erythroid signaling pathways in HbF induction seems to be indispensible and should be emphasized.
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Affiliation(s)
- Fakher Rahim
- Toxicology Research Center, Ahvaz University of Medical Sciences, Ahvaz, Iran
| | - Hossein Allahmoradi
- General Practitioner, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fatemeh Salari
- Research Center of Thalassemia & Hemoglobinopathy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Mohammad Shahjahani
- Department of Hematology and Blood Banking, School of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Ali Dehghani Fard
- Sarem Cell Research Center- SCRC, Sarem Women's Hospital, Tehran, Iran
| | - Seyed Ahmad Hosseini
- Department of nutrition, Allied Health Sciences School, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Hadi Mousakhani
- Research Center of Thalassemia & Hemoglobinopathy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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30
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Shen YH, Zhang L, Ren P, Nguyen MT, Zou S, Wu D, Wang XL, Coselli JS, LeMaire SA. AKT2 confers protection against aortic aneurysms and dissections. Circ Res 2012; 112:618-32. [PMID: 23250987 DOI: 10.1161/circresaha.112.300735] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
RATIONALE Aortic aneurysm and dissection (AAD) are major diseases of the adult aorta caused by progressive medial degeneration of the aortic wall. Although the overproduction of destructive factors promotes tissue damage and disease progression, the role of protective pathways is unknown. OBJECTIVE In this study, we examined the role of AKT2 in protecting the aorta from developing AAD. METHODS AND RESULTS AKT2 and phospho-AKT levels were significantly downregulated in human thoracic AAD tissues, especially within the degenerative medial layer. Akt2-deficient mice showed abnormal elastic fibers and reduced medial thickness in the aortic wall. When challenged with angiotensin II, these mice developed aortic aneurysm, dissection, and rupture with features similar to those in humans, in both thoracic and abdominal segments. Aortas from Akt2-deficient mice displayed profound tissue destruction, apoptotic cell death, and inflammatory cell infiltration that were not observed in aortas from wild-type mice. In addition, angiotensin II-infused Akt2-deficient mice showed significantly elevated expression of matrix metalloproteinase-9 (MMP-9) and reduced expression of tissue inhibitor of metalloproteinase-1 (TIMP-1). In cultured human aortic vascular smooth muscle cells, AKT2 inhibited the expression of MMP-9 and stimulated the expression of TIMP-1 by preventing the binding of transcription factor forkhead box protein O1 to the MMP-9 and TIMP-1 promoters. CONCLUSIONS Impaired AKT2 signaling may contribute to increased susceptibility to the development of AAD. Our findings provide evidence of a mechanism that underlies the protective effects of AKT2 on the aortic wall and that may serve as a therapeutic target in the prevention of AAD.
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Affiliation(s)
- Ying H Shen
- Division of Cardiothoracic Surgery, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX 77030, USA
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31
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Protein kinase D-HDAC5 signaling regulates erythropoiesis and contributes to erythropoietin cross-talk with GATA1. Blood 2012; 120:4219-28. [PMID: 22983445 DOI: 10.1182/blood-2011-10-387050] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
In red cell development, the differentiation program directed by the transcriptional regulator GATA1 requires signaling by the cytokine erythropoietin, but the mechanistic basis for this signaling requirement has remained unknown. Here we show that erythropoietin regulates GATA1 through protein kinase D activation, promoting histone deacetylase 5 (HDAC5) dissociation from GATA1, and subsequent GATA1 acetylation. Mice deficient for HDAC5 show resistance to anemic challenge and altered marrow responsiveness to erythropoietin injections. In ex vivo studies, HDAC5(-/-) progenitors display enhanced entry into and passage through the erythroid lineage, as well as evidence of erythropoietin-independent differentiation. These results reveal a molecular pathway that contributes to cytokine regulation of hematopoietic differentiation and offer a potential mechanism for fine tuning of lineage-restricted transcription factors by lineage-specific cytokines.
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32
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Bresnick EH, Katsumura KR, Lee HY, Johnson KD, Perkins AS. Master regulatory GATA transcription factors: mechanistic principles and emerging links to hematologic malignancies. Nucleic Acids Res 2012; 40:5819-31. [PMID: 22492510 PMCID: PMC3401466 DOI: 10.1093/nar/gks281] [Citation(s) in RCA: 139] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Numerous examples exist of how disrupting the actions of physiological regulators of blood cell development yields hematologic malignancies. The master regulator of hematopoietic stem/progenitor cells GATA-2 was cloned almost 20 years ago, and elegant genetic analyses demonstrated its essential function to promote hematopoiesis. While certain GATA-2 target genes are implicated in leukemogenesis, only recently have definitive insights emerged linking GATA-2 to human hematologic pathophysiologies. These pathophysiologies include myelodysplastic syndrome, acute myeloid leukemia and an immunodeficiency syndrome with complex phenotypes including leukemia. As GATA-2 has a pivotal role in the etiology of human cancer, it is instructive to consider mechanisms underlying normal GATA factor function/regulation and how dissecting such mechanisms may reveal unique opportunities for thwarting GATA-2-dependent processes in a therapeutic context. This article highlights GATA factor mechanistic principles, with a heavy emphasis on GATA-1 and GATA-2 functions in the hematopoietic system, and new links between GATA-2 dysregulation and human pathophysiologies.
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Affiliation(s)
- Emery H Bresnick
- Wisconsin Institutes for Medical Research, Paul Carbone Cancer Center, Department of Cell and Regenerative Biology, University of Wisconsin School of Medicine and Public Health, Madison, WI 53705, USA.
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33
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Manavathi B, Lo D, Bugide S, Dey O, Imren S, Weiss MJ, Humphries RK. Functional regulation of pre-B-cell leukemia homeobox interacting protein 1 (PBXIP1/HPIP) in erythroid differentiation. J Biol Chem 2011; 287:5600-14. [PMID: 22187427 DOI: 10.1074/jbc.m111.289843] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Pre-B-cell leukemia homeobox interacting protein 1 or human PBX1 interacting protein (PBXIP1/HPIP) is a co-repressor of pre-B-cell leukemia homeobox 1 (PBX1) and is also known to regulate estrogen receptor functions by associating with the microtubule network. Despite its initial discovery in the context of hematopoietic cells, little is yet known about the role of HPIP in hematopoiesis. Here, we show that lentivirus-mediated overexpression of HPIP in human CD34(+) cells enhances hematopoietic colony formation in vitro, whereas HPIP knockdown leads to a reduction in the number of such colonies. Interestingly, erythroid colony number was significantly higher in HPIP-overexpressing cells. In addition, forced expression of HPIP in K562 cells, a multipotent erythro-megakaryoblastic leukemia cell line, led to an induction of erythroid differentiation. HPIP overexpression in both CD34(+) and K562 cells was associated with increased activation of the PI3K/AKT pathway, and corresponding treatment with a PI3K-specific inhibitor, LY-294002, caused a reduction in clonogenic progenitor number in HPIP-expressing CD34(+) cells and decreased K562 cell differentiation. Combined, these findings point to an important role of the PI3K/AKT pathway in mediating HPIP-induced effects on the growth and differentiation of hematopoietic cells. Interestingly, HPIP gene expression was found to be induced in K562 cells in response to erythroid differentiation signals such as DMSO and erythropoietin. The erythroid lineage-specific transcription factor GATA1 binds to the HPIP promoter and activates HPIP gene transcription in a CCCTC-binding factor (CTCF)-dependent manner. Co-immunoprecipitation and co-localization experiments revealed the association of CTCF with GATA1 indicating the recruitment of CTCF/GATA1 transcription factor complex onto the HPIP promoter. Together, this study provides evidence that HPIP is a target of GATA1 and CTCF in erythroid cells and plays an important role in erythroid differentiation by modulating the PI3K/AKT pathway.
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Affiliation(s)
- Bramanandam Manavathi
- Molecular and Cellular Oncology Laboratory, Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad-500046, India.
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Ohba K, Sasaki S, Matsushita A, Iwaki H, Matsunaga H, Suzuki S, Ishizuka K, Misawa H, Oki Y, Nakamura H. GATA2 mediates thyrotropin-releasing hormone-induced transcriptional activation of the thyrotropin β gene. PLoS One 2011; 6:e18667. [PMID: 21533184 PMCID: PMC3077393 DOI: 10.1371/journal.pone.0018667] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Accepted: 03/08/2011] [Indexed: 11/19/2022] Open
Abstract
Thyrotropin-releasing hormone (TRH) activates not only the secretion of thyrotropin (TSH) but also the transcription of TSHβ and α-glycoprotein (αGSU) subunit genes. TSHβ expression is maintained by two transcription factors, Pit1 and GATA2, and is negatively regulated by thyroid hormone (T3). Our prior studies suggest that the main activator of the TSHβ gene is GATA2, not Pit1 or unliganded T3 receptor (TR). In previous studies on the mechanism of TRH-induced activation of the TSHβ gene, the involvements of Pit1 and TR have been investigated, but the role of GATA2 has not been clarified. Using kidney-derived CV1 cells and pituitary-derived GH3 and TαT1 cells, we demonstrate here that TRH signaling enhances GATA2-dependent activation of the TSHβ promoter and that TRH-induced activity is abolished by amino acid substitution in the GATA2-Zn finger domain or mutation of GATA-responsive element in the TSHβ gene. In CV1 cells transfected with TRH receptor expression plasmid, GATA2-dependent transactivation of αGSU and endothelin-1 promoters was enhanced by TRH. In the gel shift assay, TRH signal potentiated the DNA-binding capacity of GATA2. While inhibition by T3 is dominant over TRH-induced activation, unliganded TR or the putative negative T3-responsive element are not required for TRH-induced stimulation. Studies using GH3 cells showed that TRH-induced activity of the TSHβ promoter depends on protein kinase C but not the mitogen-activated protein kinase, suggesting that the signaling pathway is different from that in the prolactin gene. These results indicate that GATA2 is the principal mediator of the TRH signaling pathway in TSHβ expression.
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Affiliation(s)
- Kenji Ohba
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Shigekazu Sasaki
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
- * E-mail:
| | - Akio Matsushita
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Hiroyuki Iwaki
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Hideyuki Matsunaga
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Shingo Suzuki
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Keiko Ishizuka
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Hiroko Misawa
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Yutaka Oki
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
| | - Hirotoshi Nakamura
- Second Division, Department of Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu, Shizuoka, Japan
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Abstract
TLR2, a functional, inflammatory-related receptor, is known to be expressed on megakaryocytes and platelets and to lead to infection and immune-mediated activation of platelets; however, the role of this receptor in megakaryocytes is not understood. Using Meg-01 cells and mouse megakaryocytes, we found that NFκB, ERK-MAPK, and PI3K/Akt pathways, known downstream pathways of TLRs, are activated by Pam3CSK4, a TLR2-specific ligand. In addition, transcription factors associated with megakaryocyte maturation, GATA-1, NF-E2, and mammalian target of rapamycin (mTOR), are all increased in the presence of Pam3CSK4. The effect of Pam3CSK4 on megakaryocyte maturation was verified by the increase in DNA content and adhesion to extracellular matrix proteins by TLR2-dependent stimulation. In addition, TLR2 stimulation resulted in an increase in reactive oxygen species (ROS) production. Gene expression and protein levels of GP1b, CD41, MCP-1, COX2, NFκB1, and TLR2 were up-regulated in megakaryocytes after TLR2 stimulation through NFκB, PI3K/Akt, and ERK-MAPK pathways. Treatment of wild-type mice with Pam3CSK4 resulted in a return to normal platelet levels and an increase in megakaryocyte maturation, which did not occur in the TLR2(-/-) mice. Therefore, inflammation, through TLR2, can increase maturation and modulate the phenotype of megakaryocytes, contributing to the interrelationship between inflammation and hemostasis.
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36
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Claudin 13, a member of the claudin family regulated in mouse stress induced erythropoiesis. PLoS One 2010; 5. [PMID: 20844758 PMCID: PMC2937028 DOI: 10.1371/journal.pone.0012667] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2010] [Accepted: 08/15/2010] [Indexed: 11/19/2022] Open
Abstract
Mammals are able to rapidly produce red blood cells in response to stress. The molecular pathways used in this process are important in understanding responses to anaemia in multiple biological settings. Here we characterise the novel gene Claudin 13 (Cldn13), a member of the Claudin family of tight junction proteins using RNA expression, microarray and phylogenetic analysis. We present evidence that Cldn13 appears to be co-ordinately regulated as part of a stress induced erythropoiesis pathway and is a mouse-specific gene mainly expressed in tissues associated with haematopoietic function. CLDN13 phylogenetically groups with its genomic neighbour CLDN4, a conserved tight junction protein with a putative role in epithelial to mesenchymal transition, suggesting a recent duplication event. Mechanisms of mammalian stress erythropoiesis are of importance in anaemic responses and expression microarray analyses demonstrate that Cldn13 is the most abundant Claudin in spleen from mice infected with Trypanosoma congolense. In mice prone to anaemia (C57BL/6), its expression is reduced compared to strains which display a less severe anaemic response (A/J and BALB/c) and is differentially regulated in spleen during disease progression. Genes clustering with Cldn13 on microarrays are key regulators of erythropoiesis (Tal1, Trim10, E2f2), erythrocyte membrane proteins (Rhd and Gypa), associated with red cell volume (Tmcc2) and indirectly associated with erythropoietic pathways (Cdca8, Cdkn2d, Cenpk). Relationships between genes appearing co-ordinately regulated with Cldn13 post-infection suggest new insights into the molecular regulation and pathways involved in stress induced erythropoiesis and suggest a novel, previously unreported role for claudins in correct cell polarisation and protein partitioning prior to erythroblast enucleation.
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37
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Cho GW, Koh SH, Kim MH, Yoo AR, Noh MY, Oh S, Kim SH. The neuroprotective effect of erythropoietin-transduced human mesenchymal stromal cells in an animal model of ischemic stroke. Brain Res 2010; 1353:1-13. [DOI: 10.1016/j.brainres.2010.06.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Revised: 06/03/2010] [Accepted: 06/07/2010] [Indexed: 10/19/2022]
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38
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Martelli AM, Evangelisti C, Chiarini F, Grimaldi C, Cappellini A, Ognibene A, McCubrey JA. The emerging role of the phosphatidylinositol 3-kinase/Akt/mammalian target of rapamycin signaling network in normal myelopoiesis and leukemogenesis. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2010; 1803:991-1002. [DOI: 10.1016/j.bbamcr.2010.04.005] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2010] [Revised: 04/06/2010] [Accepted: 04/06/2010] [Indexed: 12/19/2022]
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39
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Boidot R, Végran F, Jacob D, Chevrier S, Cadouot M, Feron O, Solary E, Lizard-Nacol S. The transcription factor GATA-1 is overexpressed in breast carcinomas and contributes to survivin upregulation via a promoter polymorphism. Oncogene 2010; 29:2577-84. [DOI: 10.1038/onc.2009.525] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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40
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High-mobility group protein HMGB2 regulates human erythroid differentiation through trans-activation of GFI1B transcription. Blood 2009; 115:687-95. [PMID: 19965638 DOI: 10.1182/blood-2009-06-230094] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Gfi-1B is a transcriptional repressor that is crucial for erythroid differentiation: inactivation of the GFI1B gene in mice leads to embryonic death due to failure to produce differentiated red cells. Accordingly, GFI1B expression is tightly regulated during erythropoiesis, but the mechanisms involved in such regulation remain partially understood. We here identify HMGB2, a high-mobility group HMG protein, as a key regulator of GFI1B transcription. HMGB2 binds to the GFI1B promoter in vivo and up-regulates its trans-activation most likely by enhancing the binding of Oct-1 and, to a lesser extent, of GATA-1 and NF-Y to the GFI1B promoter. HMGB2 expression increases during erythroid differentiation concomitantly to the increase of GfI1B transcription. Importantly, knockdown of HMGB2 in immature hematopoietic progenitor cells leads to decreased Gfi-1B expression and impairs their erythroid differentiation. We propose that HMGB2 potentiates GATA-1-dependent transcription of GFI1B by Oct-1 and thereby controls erythroid differentiation.
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Direct binding of pRb/E2F-2 to GATA-1 regulates maturation and terminal cell division during erythropoiesis. PLoS Biol 2009; 7:e1000123. [PMID: 19513100 PMCID: PMC2684697 DOI: 10.1371/journal.pbio.1000123] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Accepted: 04/24/2009] [Indexed: 11/19/2022] Open
Abstract
Cell differentiation is often coupled with cell cycle arrest. Here, we show that direct binding of the erythroid transcription factor GATA-1 to the retinoblastoma protein and the pRb/E2F transcription factor complex is critical for red blood cell formation. How cell proliferation subsides as cells terminally differentiate remains largely enigmatic, although this phenomenon is central to the existence of multicellular organisms. Here, we show that GATA-1, the master transcription factor of erythropoiesis, forms a tricomplex with the retinoblastoma protein (pRb) and E2F-2. This interaction requires a LXCXE motif that is evolutionary conserved among GATA-1 orthologs yet absent from the other GATA family members. GATA-1/pRb/E2F-2 complex formation stalls cell proliferation and steers erythroid precursors towards terminal differentiation. This process can be disrupted in vitro by FOG-1, which displaces pRb/E2F-2 from GATA-1. A GATA-1 mutant unable to bind pRb fails to inhibit cell proliferation and results in mouse embryonic lethality by anemia. These findings clarify the previously suspected cell-autonomous role of pRb during erythropoiesis and may provide a unifying molecular mechanism for several mouse phenotypes and human diseases associated with GATA-1 mutations. Red blood cell production, or erythropoiesis, proceeds by a tight coupling of proliferation and differentiation. The earliest erythroid progenitor identifiable possesses remnant stem cell characteristics as it both self-renews and differentiates. Each progenitor gives rise to more than 10,000 cells, including secondary progenitors. Yet, during the next stage of differentiation, much of this renewal capability is lost, and terminal erythroid differentiation progresses in a stepwise manner through several stages separated by a single mitosis. The transcription factor GATA-1 is essential for erythroid differentiation because it induces the expression of all the known erythroid-specific genes. Here, we show that GATA-1 directly interacts with proteins that are central to the process of cell division: the retinoblastoma protein pRb and the transcription factor E2F. Specifically, E2F becomes inactivate after engaging in a GATA-1/pRb/E2F tricomplex. Another erythroid transcription factor, termed FOG-1, is able to displace pRb/E2F from this complex in vitro upon binding to GATA-1. We hypothesize that the liberated pRb/E2F can then be the target of subsequent regulation to ultimately release free E2F, which triggers cell division. The physiological role of this new pathway is evidenced by transgenic mouse experiments with GATA-1 mutants unable to bind pRb/E2F, which result in embryonic lethality by anemia.
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Thorne M, Moore CS, Robertson GS. Lack of TIMP-1 increases severity of experimental autoimmune encephalomyelitis: Effects of darbepoetin alfa on TIMP-1 null and wild-type mice. J Neuroimmunol 2009; 211:92-100. [DOI: 10.1016/j.jneuroim.2009.04.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2009] [Revised: 04/02/2009] [Accepted: 04/08/2009] [Indexed: 12/27/2022]
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Missiroli S, Etro D, Buontempo F, Ye K, Capitani S, Neri LM. Nuclear translocation of active AKT is required for erythroid differentiation in erythropoietin treated K562 erythroleukemia cells. Int J Biochem Cell Biol 2008; 41:570-7. [PMID: 18694847 DOI: 10.1016/j.biocel.2008.07.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2008] [Revised: 06/25/2008] [Accepted: 07/10/2008] [Indexed: 11/28/2022]
Abstract
Erythroid differentiation of human erythroleukemia cell line K562 induced by erythropoietin is a complex process that involves modifications at nuclear level, including nuclear translocation of phosphatidyl-inositol 3-kinase. In this work we show that erythropoietin stimulation of K562 cells can induce nuclear translocation of active Akt, a downstream molecule of the phosphatidyl-inositol 3-kinase signaling pathway. Akt shows a peak of activity in whole cell homogenates at earlier stage when compared to the nucleus, which shows a peak delayed of 10 min. Akt increases its intranuclear amount and activity rapidly and transiently in response to EPO. Almost all Akt kinase that translocates to the nucleus shows a marked phosphorylation on serine 473. Nuclear enzyme translocation is blocked by the phosphatidyl-inositol 3-kinase inhibitor Ly294002 or Wortmannin. The specific Akt pharmacological inhibitor VI, VII and VIII that act as blocking enzyme activation inhibited translocation as well, whereas Akt inhibitor IX, that inhibits Akt activity, did not block Akt nuclear translocation. When cells were treated by means of siRNA sequences or with the Akt inhibitors the differentiation process was arrested, thus showing the requirement of the nuclear translocation of the active enzyme to differentiate. These findings strongly suggest that the intranuclear translocation of active Akt kinase represents an important step in the signaling pathway that mediates erythropoietin-induced erythroid differentiation.
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Affiliation(s)
- Silvia Missiroli
- Dipartimento di Morfologia ed Embriologia, Sezione di Anatomia Umana, Signal Transduction Unit, Universita' di Ferrara, Ferrara, Italy
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44
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RETRACTED: Local erythropoietin signaling enhances regeneration in peripheral axons. Neuroscience 2008; 154:767-83. [DOI: 10.1016/j.neuroscience.2008.03.052] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Revised: 03/18/2008] [Accepted: 03/19/2008] [Indexed: 12/12/2022]
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45
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Ghinassi B, Verrucci M, Jelicic K, Di Noia A, Migliaccio G, Migliaccio AR. Interleukin-3 and erythropoietin cooperate in the regulation of the expression of erythroid-specific transcription factors during erythroid differentiation. Exp Hematol 2007; 35:735-47. [PMID: 17577923 DOI: 10.1016/j.exphem.2007.02.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To characterize how interleukin-3 and erythropoietin regulate cell fate by modulating the expression of lineage-specific transcription factors. METHODS This study analyzed mRNA and protein levels, gene transcription rates, and mRNA and protein stabilities of erythroid-specific transcription factors in lineage-restricted cells derived from the 32D cell line cultured either in interleukin-3 or erythropoietin. RESULTS Erythroid 32D subclones expressed levels of Idl, Gata-2, and Scl comparable and levels of Eklf and Gata-1 higher than those expressed by myeloid subclones. While maintained in interleukin-3, erythroid cells remained immature despite their high expression of Gata-1, Gata-2, Scl, Eklf, and Idl. Switching the erythroid cells to erythropoietin induced cell maturation (within 48 hours) and reduced expression of Gata-2 and Idl (in 24 hours) but did not alter the expression of Gata-1. The effects of interleukin-3 were mostly mediated by increases in transcription rates (Scl and Gata-2), and that of erythropoietin was apparently due to increased mRNA and protein (Gata-1, Scl, and Eklf) stability. In particular, erythropoietin increased the stability of the processed and transcriptionally more active form of GATA-1 protein. CONCLUSIONS These results suggest that interleukin-3 and erythropoietin cooperate to establish the lineage-specific transcription factor milieu of erythroid cells: interleukin-3 regulates mainly gene transcription and erythropoietin consistently increases mRNA and protein stability.
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Affiliation(s)
- Barbara Ghinassi
- Department of Hematology, Oncology and Molecular Medicine, Istituto Superiore Sanità, Rome, Italy
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46
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Rimmelé P, Kosmider O, Mayeux P, Moreau-Gachelin F, Guillouf C. Spi-1/PU.1 participates in erythroleukemogenesis by inhibiting apoptosis in cooperation with Epo signaling and by blocking erythroid differentiation. Blood 2007; 109:3007-14. [PMID: 17132716 DOI: 10.1182/blood-2006-03-006718] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Overexpression of the transcription factor Spi-1/PU.1 in mice leads to acute erythroleukemia characterized by a differentiation block at the proerythroblastic stage. In this study, we made use of a new cellular system allowing us to reach graded expression of Spi-1 in preleukemic cells to dissect mechanisms of Spi-1/ PU-1 in erythroleukemogenesis. This system is based on conditional production of 1 or 2 spi-1-interfering RNAs stably inserted into spi-1 transgenic proerythroblasts. We show that Spi-1 knock-down was sufficient to reinstate the erythroid differentiation program. This differentiation process was associated with an exit from the cell cycle. Evidence is provided that in the presence of erythropoietin (Epo), Spi-1 displays an antiapoptotic role that is independent of its function in blocking erythroid differentiation. Apoptosis inhibited by Spi-1 did not involve activation of the Fas/FasL signaling pathway nor a failure to activate Epo receptor (EpoR). Furthermore, we found that reducing the Spi-1 level yields to ERK dephosphorylation and increased phosphorylation of AKT and STAT5, suggesting that Spi-1 may affect major signaling pathways downstream of the EpoR in erythroid cells. These findings reveal 2 distinct roles for Spi-1 during erythroleukemogenesis: Spi-1 blocks the erythroid differentiation program and acts to impair apoptotic death in cooperation with an Epo signaling.
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MESH Headings
- Animals
- Apoptosis/physiology
- Base Sequence
- Cell Cycle/physiology
- Cell Differentiation
- Erythroblasts/pathology
- Erythroblasts/physiology
- Erythropoiesis/physiology
- Erythropoietin/physiology
- Humans
- Leukemia, Erythroblastic, Acute/etiology
- Leukemia, Erythroblastic, Acute/genetics
- Leukemia, Erythroblastic, Acute/pathology
- Leukemia, Erythroblastic, Acute/physiopathology
- Mice
- Mice, Transgenic
- Proto-Oncogene Proteins/antagonists & inhibitors
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins/physiology
- RNA, Small Interfering/genetics
- Receptors, Erythropoietin/physiology
- Signal Transduction/physiology
- Trans-Activators/antagonists & inhibitors
- Trans-Activators/genetics
- Trans-Activators/physiology
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Affiliation(s)
- Pauline Rimmelé
- Institut Curie, Institut National de la Santé et de la Recherche Médicale (INSERM) Unite 528, Paris, France
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47
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Dassé E, Bridoux L, Baranek T, Lambert E, Salesse S, Sowa ML, Martiny L, Trentesaux C, Petitfrère E. Tissue inhibitor of metalloproteinase-1 promotes hematopoietic differentiation via caspase-3 upstream the MEKK1/MEK6/p38alpha pathway. Leukemia 2007; 21:595-603. [PMID: 17301822 DOI: 10.1038/sj.leu.2404540] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Besides its matrix metalloproteinases inhibitory activity, TIMP-1 exhibits other biological activities such as cell survival and proliferation. The intracellular signalling pathway elicited by TIMP-1 begins to be elucidated. We have shown previously that the caspase-3 and the p38alpha MAP kinase were activated during TIMP-1-induced UT-7 cells erythroid differentiation. In this study, we demonstrated that TIMP-1 differentiating effect can be extended to the IL-3-dependent myeloid murine 32D cell line and human erythroid progenitors derived from cord blood CD34(+) cells. By performing small interfering RNA transfection and using chemical inhibitors, we evidenced that caspase-3 was involved in TIMP-1 differentiating effect. We then identified the MEKK1 kinase as a caspase-3 substrate and demonstrated that the MEKK1/MEK6/p38alpha pathway was activated downstream the caspase-3 in TIMP-1-induced hematopoietic differentiation.
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Affiliation(s)
- E Dassé
- Laboratoire de Biochimie, CNRS 6198, IFR 53 Biomolécules, UFR Sciences Exactes et Naturelles, BP 1039, Université de Reims Champagne Ardenne, Reims, France
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48
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Ludolph B, Bloch W, Kelm M, Schulz R, Kleinbongard P. Short-term effect of the HMG-CoA reductase inhibitor rosuvastatin on erythrocyte nitric oxide synthase activity. Vasc Health Risk Manag 2007; 3:1069-73. [PMID: 18200826 PMCID: PMC2350149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Prevention and treatment of cardiovascular disorders by HMG-CoA reductase inhibitors (or statins), beyond their lipid-lowering properties, have been demonstrated including activation of the endothelial nitric oxide synthase (eNOS). Beside endothelial cells, red blood cells (RBCs) possess NOS and produce nitric oxide (NO), which contributes to RBC deformability. The present study tested the capacity of statins to activate NOS in RBCs and subsequently to modulate RBC deformability in vitro. Blood samples of healthy young volunteers were incubated with or without rosuvastatin. Afterwards RBC-NOS activity and RBC deformability were determined. Rosuvastatin incubation significantly increased NOS phosphorylation, NOS dependent NO-formation, and RBC deformability. The NOS inhibitor NG- monomethyl-L-arginine reversed the stimulatory effect of rosuvastatin on RBC-NOS activity. This NO dependent effect of rosuvastatin might have an important influence on microcirculation and may offer new perspectives for the therapeutic use of statins.
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Affiliation(s)
- Barbara Ludolph
- Department of Medicine, Medical Clinic I, University Hospital RTWH AachenGermany
| | - Wilhelm Bloch
- Department of Molecular and Cellular Sport Medicine, Sport University CologneGermany
| | - Malte Kelm
- Department of Medicine, Medical Clinic I, University Hospital RTWH AachenGermany
| | - Rainer Schulz
- Institute of Pathophysiology, Medical School, University of EssenGermany
| | - Petra Kleinbongard
- Department of Medicine, Medical Clinic I, University Hospital RTWH AachenGermany
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49
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Sivertsen EA, Hystad ME, Gutzkow KB, Døsen G, Smeland EB, Blomhoff HK, Myklebust JH. PI3K/Akt-dependent Epo-induced signalling and target genes in human early erythroid progenitor cells. Br J Haematol 2006; 135:117-28. [PMID: 16965383 DOI: 10.1111/j.1365-2141.2006.06252.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Erythropoietin (Epo) is the major regulator of differentiation, proliferation and survival of erythroid progenitors, but the Epo-induced changes in gene expression that lead to these effects are not fully understood. The aim of this study was to examine how Epo, via activation of phosphatidylinositol 3-kinase (PI3K)/Akt, exerts its role in the development of erythroid progenitors from CD34+ cells, and to identify early Epo target genes in human erythroid progenitors. In CD34+ progenitor cells, Epo alone was able to induce cell cycle progression as demonstrated by upregulation of cyclin D3, E and A leading to hyperphosphorylation of the retinoblastoma protein (RB). These effects were completely counteracted by the PI3K inhibitor LY294002. Furthermore, enforced expression of an activated form of Akt kinase highly augmented Epo-induced erythropoiesis. Fluorescent-activated cell sorting (FACS)-sorted CD34+CD71+CD45RA-GPA- erythroid progenitors stimulated with Epo in the presence or absence of LY294002 were subjected to gene expression profiling. Several novel target genes of Epo were identified, and the majority were regulated in a PI3K-dependent manner, including KIT (CD117) and CDH1 (E-cadherin). FACS analysis of Epo-stimulated erythroid progenitors showed that the increased mRNA expression of KIT and CDH1 was accompanied by an induction of the corresponding proteins CD117 and E-cadherin.
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Affiliation(s)
- Einar Andreas Sivertsen
- Department of Immunology, Institute of Cancer Research, Rikshospitalet-Radiumhospitalet Medical Centre, Oslo, Norway
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50
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Abstract
Tissue inhibitors of metalloproteinases (TIMPs) are endogenous inhibitors of matrix metalloproteinases (MMPs) and the balance between MMPs/TIMPs regulates the extracellular matrix (ECM) turnover and remodeling during normal development and pathogenesis. Increasing evidence indicates a much more complex role for TIMPs during tumor progression and angiogenesis, in addition to their regulation of MMP-mediated ECM degradation. In this article, we review both the MMP-dependent and -independent actions of TIMPs for the regulation of cell death, cell proliferation, and angiogenesis, with a particular emphasis on TIMP-1 in the regulation of tetraspanin/integrin-mediated cell survival signal transduction pathways.
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Affiliation(s)
- Rosemarie Chirco
- Department of Pathology, Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, 540 East Canfield Avenue, Detroit, Michigan 48201, USA.
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