1
|
Zhang Y, Zhou Y, Li X, Pan X, Bai J, Chen Y, Lai Z, Chen Q, Ma F, Dong Y. Small-molecule α-lipoic acid targets ELK1 to balance human neutrophil and erythrocyte differentiation. Stem Cell Res Ther 2024; 15:100. [PMID: 38589882 PMCID: PMC11003016 DOI: 10.1186/s13287-024-03711-6] [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: 10/30/2022] [Accepted: 03/31/2024] [Indexed: 04/10/2024] Open
Abstract
BACKGROUND Erythroid and myeloid differentiation disorders are commonly occurred in leukemia. Given that the relationship between erythroid and myeloid lineages is still unclear. To find the co-regulators in erythroid and myeloid differentiation might help to find new target for therapy of myeloid leukemia. In hematopoiesis, ALA (alpha lipoic acid) is reported to inhibit neutrophil lineage determination by targeting transcription factor ELK1 in granulocyte-monocyte progenitors via splicing factor SF3B1. However, further exploration is needed to determine whether ELK1 is a common regulatory factor for erythroid and myeloid differentiation. METHODS In vitro culture of isolated CD34+, CMPs (common myeloid progenitors) and CD34+ CD371- HSPCs (hematopoietic stem progenitor cells) were performed to assay the differentiation potential of monocytes, neutrophils, and erythrocytes. Overexpression lentivirus of long isoform (L-ELK1) or the short isoform (S-ELK1) of ELK1 transduced CD34+ HSPCs were transplanted into NSG mice to assay the human lymphocyte and myeloid differentiation differences 3 months after transplantation. Knocking down of SRSF11, which was high expressed in CD371+GMPs (granulocyte-monocyte progenitors), upregulated by ALA and binding to ELK1-RNA splicing site, was performed to analyze the function in erythroid differentiation derived from CD34+ CD123mid CD38+ CD371- HPCs (hematopoietic progenitor cells). RNA sequencing of L-ELK1 and S-ELK1 overexpressed CD34+ CD123mid CD38+ CD371- HPCs were performed to assay the signals changed by ELK1. RESULTS Here, we presented new evidence that ALA promoted erythroid differentiation by targeting the transcription factor ELK1 in CD34+ CD371- hematopoietic stem progenitor cells (HSPCs). Overexpression of either the long isoform (L-ELK1) or the short isoform (S-ELK1) of ELK1 inhibited erythroid-cell differentiation, but knockdown of ELK1 did not affect erythroid-cell differentiation. RNAseq analysis of CD34+ CD123mid CD38+ CD371- HPCs showed that L-ELK1 upregulated the expression of genes related to neutrophil activity, phosphorylation, and hypoxia signals, while S-ELK1 mainly regulated hypoxia-related signals. However, most of the genes that were upregulated by L-ELK1 were only moderately upregulated by S-ELK1, which might be due to a lack of serum response factor interaction and regulation domains in S-ELK1 compared to L-ELK1. In summary, the differentiation of neutrophils and erythrocytes might need to rely on the dose of L-ELK1 and S-ELK1 to achieve precise regulation via RNA splicing signals at early lineage commitment. CONCLUSIONS ALA and ELK1 are found to regulate both human granulopoiesis and erythropoiesis via RNA spliceosome, and ALA-ELK1 signal might be the target of human leukemia therapy.
Collapse
Affiliation(s)
- Yimeng Zhang
- Department of Immunology, School of Basic Medical Sciences, Chengdu Medical College, Xindu Road 783, Chengdu, 610500, China
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu, China
| | - Ya Zhou
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu, China
| | - Xiaohong Li
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu, China
| | - Xu Pan
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu, China
| | - Ju Bai
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu, China
| | - Yijin Chen
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu, China
| | | | - Qiang Chen
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu, China
| | - Feng Ma
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu, China.
| | - Yong Dong
- Department of Immunology, School of Basic Medical Sciences, Chengdu Medical College, Xindu Road 783, Chengdu, 610500, China.
- Center for Stem Cell Research and Application, Institute of Blood Transfusion, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Chengdu, China.
| |
Collapse
|
2
|
Wang X, Zhang W, Zhao S, Yan H, Xin Z, Cui T, Zang R, Zhao L, Wang H, Zhou J, Li X, Yue W, Xi J, Zhang Z, Fang X, Pei X. Decoding human in vitro terminal erythropoiesis originating from umbilical cord blood mononuclear cells and pluripotent stem cells. Cell Prolif 2024:e13614. [PMID: 38499435 DOI: 10.1111/cpr.13614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 12/18/2023] [Accepted: 01/30/2024] [Indexed: 03/20/2024] Open
Abstract
Ex vivo red blood cell (RBC) production generates unsatisfactory erythroid cells. A deep exploration into terminally differentiated cells is required to understand the impairments for RBC generation and the underlying mechanisms. Here, we mapped an atlas of terminally differentiated cells from umbilical cord blood mononuclear cells (UCBMN) and pluripotent stem cells (PSC) and observed their dynamic regulation of erythropoiesis at single-cell resolution. Interestingly, we detected a few progenitor cells and non-erythroid cells from both origins. In PSC-derived erythropoiesis (PSCE), the expression of haemoglobin switch regulators (BCL11A and ZBTB7A) were significantly absent, which could be the restraint for its adult globin expression. We also found that PSCE were less active in stress erythropoiesis than in UCBMN-derived erythropoiesis (UCBE), and explored an agonist of stress erythropoiesis gene, TRIB3, could enhance the expression of adult globin in PSCE. Compared with UCBE, there was a lower expression of epigenetic-related proteins (e.g., CASPASE 3 and UBE2O) and transcription factors (e.g., FOXO3 and TAL1) in PSCE, which might restrict PSCE's enucleation. Moreover, we characterized a subpopulation with high proliferation capacity marked by CD99high in colony-forming unit-erythroid cells. Inhibition of CD99 reduced the proliferation of PSC-derived cells and facilitated erythroid maturation. Furthermore, CD99-CD99 mediated the interaction between macrophages and erythroid cells, illustrating a mechanism by which macrophages participate in erythropoiesis. This study provided a reference for improving ex vivo RBC generation.
Collapse
Affiliation(s)
- Xiaoling Wang
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Wei Zhang
- Beijing Institute of Genomics & China National Center for Bioinformation, Chinese Academy of Sciences, Beijing, PR China
| | - Siqi Zhao
- Beijing Institute of Genomics & China National Center for Bioinformation, Chinese Academy of Sciences, Beijing, PR China
| | - Hao Yan
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Zijuan Xin
- Beijing Institute of Genomics & China National Center for Bioinformation, Chinese Academy of Sciences, Beijing, PR China
| | - Tiantian Cui
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Ruge Zang
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Lingping Zhao
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Haiyang Wang
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Junnian Zhou
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Xuan Li
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Wen Yue
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Jiafei Xi
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Zhaojun Zhang
- Beijing Institute of Genomics & China National Center for Bioinformation, Chinese Academy of Sciences, Beijing, PR China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, PR China
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing, PR China
- Beijing Key Laboratory of Genome and Precision Medicine Technologies, Beijing, PR China
| | - Xiangdong Fang
- Beijing Institute of Genomics & China National Center for Bioinformation, Chinese Academy of Sciences, Beijing, PR China
- Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, PR China
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing, PR China
- Beijing Key Laboratory of Genome and Precision Medicine Technologies, Beijing, PR China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, PR China
- Savaid Medical School, University of Chinese Academy of Sciences, Beijing, PR China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing, PR China
| | - Xuetao Pei
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Radiation Medicine, Beijing, PR China
| |
Collapse
|
3
|
Bhoopalan SV, Huang LJS, Weiss MJ. Erythropoietin regulation of red blood cell production: from bench to bedside and back. F1000Res 2020; 9:F1000 Faculty Rev-1153. [PMID: 32983414 PMCID: PMC7503180 DOI: 10.12688/f1000research.26648.1] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/04/2020] [Indexed: 12/18/2022] Open
Abstract
More than 50 years of efforts to identify the major cytokine responsible for red blood cell (RBC) production (erythropoiesis) led to the identification of erythropoietin (EPO) in 1977 and its receptor (EPOR) in 1989, followed by three decades of rich scientific discovery. We now know that an elaborate oxygen-sensing mechanism regulates the production of EPO, which in turn promotes the maturation and survival of erythroid progenitors. Engagement of the EPOR by EPO activates three interconnected signaling pathways that drive RBC production via diverse downstream effectors and simultaneously trigger negative feedback loops to suppress signaling activity. Together, the finely tuned mechanisms that drive endogenous EPO production and facilitate its downstream activities have evolved to maintain RBC levels in a narrow physiological range and to respond rapidly to erythropoietic stresses such as hypoxia or blood loss. Examination of these pathways has elucidated the genetics of numerous inherited and acquired disorders associated with deficient or excessive RBC production and generated valuable drugs to treat anemia, including recombinant human EPO and more recently the prolyl hydroxylase inhibitors, which act partly by stimulating endogenous EPO synthesis. Ongoing structure-function studies of the EPOR and its essential partner, tyrosine kinase JAK2, suggest that it may be possible to generate new "designer" drugs that control selected subsets of cytokine receptor activities for therapeutic manipulation of hematopoiesis and treatment of blood cancers.
Collapse
Affiliation(s)
- Senthil Velan Bhoopalan
- Department of Hematology, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, MS #355, Memphis, TN, 38105, USA
| | - Lily Jun-shen Huang
- Department of Cell Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX, 75390, USA
| | - Mitchell J. Weiss
- Department of Hematology, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, MS #355, Memphis, TN, 38105, USA
| |
Collapse
|
4
|
Örd T, Puurand T, Örd D, Annilo T, Möls M, Remm M, Örd T. A human-specific VNTR in the TRIB3 promoter causes gene expression variation between individuals. PLoS Genet 2020; 16:e1008981. [PMID: 32745133 PMCID: PMC7425993 DOI: 10.1371/journal.pgen.1008981] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 08/13/2020] [Accepted: 07/06/2020] [Indexed: 02/07/2023] Open
Abstract
Tribbles homolog 3 (TRIB3) is pseudokinase involved in intracellular regulatory processes and has been implicated in several diseases. In this article, we report that human TRIB3 promoter contains a 33-bp variable number tandem repeat (VNTR) and characterize the heterogeneity and function of this genetic element. Analysis of human populations around the world uncovered the existence of alleles ranging from 1 to 5 copies of the repeat, with 2-, 3- and 5-copy alleles being the most common but displaying considerable geographical differences in frequency. The repeated sequence overlaps a C/EBP-ATF transcriptional regulatory element and is highly conserved, but not repeated, in various mammalian species, including great apes. The repeat is however evident in Neanderthal and Denisovan genomes. Reporter plasmid experiments in human cell culture reveal that an increased copy number of the TRIB3 promoter 33-bp repeat results in increased transcriptional activity. In line with this, analysis of whole genome sequencing and RNA-Seq data from human cohorts demonstrates that the copy number of TRIB3 promoter 33-bp repeats is positively correlated with TRIB3 mRNA expression level in many tissues throughout the body. Moreover, the copy number of the TRIB3 33-bp repeat appears to be linked to known TRIB3 eQTL SNPs as well as TRIB3 SNPs reported in genetic association studies. Taken together, the results indicate that the promoter 33-bp VNTR constitutes a causal variant for TRIB3 expression variation between individuals and could underlie the results of SNP-based genetic studies.
Collapse
Affiliation(s)
- Tiit Örd
- Estonian Biocentre, Institute of Genomics, University of Tartu, Tartu, Estonia
| | - Tarmo Puurand
- Institute of Molecular and Cell Biology, University of Tartu, Tartu, Estonia
| | - Daima Örd
- Estonian Biocentre, Institute of Genomics, University of Tartu, Tartu, Estonia
| | - Tarmo Annilo
- Estonian Genome Center, Institute of Genomics, University of Tartu, Tartu, Estonia
| | - Märt Möls
- Institute of Molecular and Cell Biology, University of Tartu, Tartu, Estonia
- Institute of Mathematics and Statistics, University of Tartu, Tartu, Estonia
| | - Maido Remm
- Institute of Molecular and Cell Biology, University of Tartu, Tartu, Estonia
| | - Tõnis Örd
- Estonian Biocentre, Institute of Genomics, University of Tartu, Tartu, Estonia
| |
Collapse
|
5
|
Salomé M, Hopcroft L, Keeshan K. Inverse and correlative relationships between TRIBBLES genes indicate non-redundant functions during normal and malignant hemopoiesis. Exp Hematol 2018; 66:63-78.e13. [PMID: 30031847 DOI: 10.1016/j.exphem.2018.07.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 07/11/2018] [Accepted: 07/12/2018] [Indexed: 01/31/2023]
Abstract
TRIBBLES pseudokinases (TRIB1, TRIB2, and TRIB3) are important regulators of normal and malignant hemopoiesis. The relative abundance of each TRIBBLES family member may be important for distinct oncogenic or tumor suppressor functions. We map the expression profiles of TRIB1, TRIB2, and TRIB3 in human and murine hemopoietic stem, progenitor and mature cells, and in human leukemia datasets. Our data show that TRIB1-TRIB2 have an inverse expression relationship in normal hemopoiesis, whereas TRIB1-TRIB3 have a positive correlation. We reveal that TRIB3 expression is high in the dormant hemopoietic stem cell (HSC) population, implicating a novel role for TRIB3 in stem cell quiescence. These analyses support a non-redundant role for each TRIBBLES member during normal hemopoietic differentiation. We show that TRIB1-TRIB2 display a significant negative correlation in myelodysplastic syndrome and acute myeloid leukemia (AML) subtypes, but not in acute lymphoid leukemia. This inverse relationship is specific to certain subtypes of AML. A positive correlation exists in different leukemia subtypes between TRIB1-TRIB3. The TRIB1-TRIB2 and TRIB1-TRIB3 correlations are consistent with a correlative relationship with C/EBP transcription factor family members. Our results have implications for the development of strategies to therapeutically target these genes in different types of leukemia.
Collapse
Affiliation(s)
- Mara Salomé
- Paul O'Gorman Leukaemia Research Centre, Institute of Cancer Sciences, University of Glasgow, Scotland, UK
| | - Lisa Hopcroft
- Paul O'Gorman Leukaemia Research Centre, Institute of Cancer Sciences, University of Glasgow, Scotland, UK
| | - Karen Keeshan
- Paul O'Gorman Leukaemia Research Centre, Institute of Cancer Sciences, University of Glasgow, Scotland, UK.
| |
Collapse
|
6
|
Örd T, Örd D, Örd T. TRIB3 limits FGF21 induction during in vitro and in vivo nutrient deficiencies by inhibiting C/EBP-ATF response elements in the Fgf21 promoter. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2018; 1861:271-281. [PMID: 29378327 DOI: 10.1016/j.bbagrm.2018.01.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 01/21/2018] [Accepted: 01/22/2018] [Indexed: 12/11/2022]
Abstract
Mammals must be able to endure periods of limited food availability, and the liver plays a central role in the adaptation to nutritional stresses. TRIB3 (Tribbles homolog 3) is a cellular stress-inducible gene with a liver-centric expression pattern and it has been implicated in stress response regulation and metabolic control. In the current article, we study the involvement of TRIB3 in responses to nutrient deficiencies, including fasting for up to 48 h in mice. We show that hepatic expression of Trib3 is increased after 48 h of fasting and mice with a targeted deletion of the Trib3 gene present elevated hepatic triglyceride content and liver weight at 48 h, along with an upregulation of lipid utilization genes in the liver. Further, hepatic and serum levels of the metabolic stress hormone FGF21 are considerably increased in 48-h-fasted Trib3 knockout mice compared to wild type. Trib3 deficiency also leads to elevated FGF21 levels in the mouse liver during essential amino acid deficiency and in cultured mouse embryonic fibroblasts during glucose starvation. Reporter assays reveal that TRIB3 regulates FGF21 by inhibiting ATF4-mediated, C/EBP-ATF site-dependent activation of Fgf21 transcription. Based on chromatin immunoprecipitation from mouse liver, the binding of TRIB3 and ATF4, a transcription factor known to physically interact with TRIB3, is significantly increased at the Fgf21 promoter following 48 h of fasting. Thus, under nutrient-limiting conditions that stimulate ATF4 activity, TRIB3 is implicated in the regulation of metabolic adaptation by restraining the transcription of Fgf21.
Collapse
Affiliation(s)
- Tiit Örd
- Estonian Biocentre, Institute of Genomics, University of Tartu, Riia 23b, 51010 Tartu, Estonia
| | - Daima Örd
- Estonian Biocentre, Institute of Genomics, University of Tartu, Riia 23b, 51010 Tartu, Estonia
| | - Tõnis Örd
- Estonian Biocentre, Institute of Genomics, University of Tartu, Riia 23b, 51010 Tartu, Estonia.
| |
Collapse
|
7
|
Butcher L, Ahluwalia M, Örd T, Johnston J, Morris RH, Kiss-Toth E, Örd T, Erusalimsky JD. Evidence for a role of TRIB3 in the regulation of megakaryocytopoiesis. Sci Rep 2017; 7:6684. [PMID: 28751721 PMCID: PMC5532315 DOI: 10.1038/s41598-017-07096-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 06/27/2017] [Indexed: 12/23/2022] Open
Abstract
Megakaryocytopoiesis is a complex differentiation process driven by the hormone thrombopoietin by which haematopoietic progenitor cells give rise to megakaryocytes, the giant bone marrow cells that in turn break down to form blood platelets. The Tribbles Pseudokinase 3 gene (TRIB3) encodes a pleiotropic protein increasingly implicated in the regulation of cellular differentiation programmes. Previous studies have hinted that TRIB3 could be also involved in megakaryocytopoiesis but its role in this process has so far not been investigated. Using cellular model systems of haematopoietic lineage differentiation here we demonstrate that TRIB3 is a negative modulator of megakaryocytopoiesis. We found that in primary cultures derived from human haematopoietic progenitor cells, thrombopoietin-induced megakaryocytic differentiation led to a time and dose-dependent decrease in TRIB3 mRNA levels. In the haematopoietic cell line UT7/mpl, silencing of TRIB3 increased basal and thrombopoietin-stimulated megakaryocyte antigen expression, as well as basal levels of ERK1/2 phosphorylation. In primary haematopoietic cell cultures, silencing of TRIB3 facilitated megakaryocyte differentiation. In contrast, over-expression of TRIB3 in these cells inhibited the differentiation process. The in-vitro identification of TRIB3 as a negative regulator of megakaryocytopoiesis suggests that in-vivo this gene could be important for the regulation of platelet production.
Collapse
Affiliation(s)
- Lee Butcher
- School of Health Sciences, Cardiff Metropolitan University, Cardiff, UK
| | | | - Tiit Örd
- Estonian Biocentre, Tartu, Estonia
| | - Jessica Johnston
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | - Roger H Morris
- School of Health Sciences, Cardiff Metropolitan University, Cardiff, UK
| | - Endre Kiss-Toth
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield, UK
| | | | | |
Collapse
|
8
|
Kurkewich JL, Hansen J, Klopfenstein N, Zhang H, Wood C, Boucher A, Hickman J, Muench DE, Grimes HL, Dahl R. The miR-23a~27a~24-2 microRNA cluster buffers transcription and signaling pathways during hematopoiesis. PLoS Genet 2017; 13:e1006887. [PMID: 28704388 PMCID: PMC5531666 DOI: 10.1371/journal.pgen.1006887] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 07/27/2017] [Accepted: 06/21/2017] [Indexed: 02/07/2023] Open
Abstract
MicroRNA cluster mirn23a has previously been shown to promote myeloid development at the expense of lymphoid development in overexpression and knockout mouse models. This polarization is observed early in hematopoietic development, with an increase in common lymphoid progenitors (CLPs) and a decrease in all myeloid progenitor subsets in adult bone marrow. The pool size of multipotential progenitors (MPPs) is unchanged; however, in this report we observe by flow cytometry that polarized subsets of MPPs are changed in the absence of mirn23a. Additionally, in vitro culture of MPPs and sorted MPP transplants showed that these cells have decreased myeloid and increased lymphoid potential in vitro and in vivo. We investigated the mechanism by which mirn23a regulates hematopoietic differentiation and observed that mirn23a promotes myeloid development of hematopoietic progenitors through regulation of hematopoietic transcription factors and signaling pathways. Early transcription factors that direct the commitment of MPPs to CLPs (Ikzf1, Runx1, Satb1, Bach1 and Bach2) are increased in the absence of mirn23a miRNAs as well as factors that commit the CLP to the B cell lineage (FoxO1, Ebf1, and Pax5). Mirn23a appears to buffer transcription factor levels so that they do not stochastically reach a threshold level to direct differentiation. Intriguingly, mirn23a also inversely regulates the PI3 kinase (PI3K)/Akt and BMP/Smad signaling pathways. Pharmacological inhibitor studies, coupled with dominant active/dominant negative biochemical experiments, show that both signaling pathways are critical to mirn23a’s regulation of hematopoietic differentiation. Lastly, consistent with mirn23a being a physiological inhibitor of B cell development, we observed that the essential B cell transcription factor EBF1 represses expression of mirn23a. In summary, our data demonstrates that mirn23a regulates a complex array of transcription and signaling pathways to modulate adult hematopoiesis. MicroRNAs (miRNAs) are small ~22 nucleotide long RNA molecules that are involved in regulating multiple cellular processes through inhibiting the expression of target proteins. We previously identified a gene (mirn23a) that codes for 3 miRNAs that control the development of immune cells in the bone marrow. The miRNAs promote the development of innate immune cells, macrophages and granulocytes, while repressing the development of B cells. Here we show that mirn23a miRNAs negatively affect the expression of multiple proteins that are involved in directing blood progenitor cells to become B cells. Additionally, we observed that modulation of FoxO1 and Smad proteins, downstream effectors of two signaling pathways (PI3 kinase/ Akt and BMP/ Smad), is critical to direct immune cell development. This is the first observation that these pathways are potentially coregulated during the commitment of blood progenitors to mature cells of the immune system. Consistent with mirn23a being a critical gene for committing progenitors to innate immune cells at the expense of B cells, we observed that a critical B cell protein represses the expression of mirn23a. In conclusion, we demonstrate the mirn23a regulation of blood development is due to a complex regulation of both transcription factors and signaling pathways.
Collapse
Affiliation(s)
- Jeffrey L. Kurkewich
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Harper Cancer Research Institute, South Bend, IN, United States of America
| | - Justin Hansen
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Harper Cancer Research Institute, South Bend, IN, United States of America
| | - Nathan Klopfenstein
- Harper Cancer Research Institute, South Bend, IN, United States of America
- Department of Microbiology and Immunology, Indiana University School of Medicine, South Bend, IN, United States of America
| | - Helen Zhang
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Harper Cancer Research Institute, South Bend, IN, United States of America
| | - Christian Wood
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Harper Cancer Research Institute, South Bend, IN, United States of America
| | - Austin Boucher
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Harper Cancer Research Institute, South Bend, IN, United States of America
| | - Joseph Hickman
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Harper Cancer Research Institute, South Bend, IN, United States of America
| | - David E. Muench
- Division of Immunobiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States of America
| | - H. Leighton Grimes
- Division of Immunobiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States of America
| | - Richard Dahl
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Harper Cancer Research Institute, South Bend, IN, United States of America
- Department of Microbiology and Immunology, Indiana University School of Medicine, South Bend, IN, United States of America
- * E-mail:
| |
Collapse
|
9
|
Abstract
The t(15;17) translocation generates a PML-RARα fusion protein causative for acute promyelocytic leukemia (APL). Li et al. now identify the pseudokinase stress protein TRIB3 as an important factor in APL disease progression and therapy resistance. Targeting the interaction of TRIB3 and PML-RARα using peptide technology provides a novel therapeutic approach.
Collapse
Affiliation(s)
- Ruaidhrí Carmody
- Centre for Immunobiology, Institute of Infection, Immunity and Inflammation, College of Medicine, Veterinary and Life Sciences, University of Glasgow, Glasgow, G12 8TA, UK
| | - Karen Keeshan
- Paul O'Gorman Leukaemia Research Centre, College of Medicine, Veterinary and Life Sciences, Institute of Cancer Sciences, University of Glasgow, Glasgow, G12 0XB, UK.
| |
Collapse
|