1
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Liu Y, Song R, Lu Z, Zhao L, Zhan X, Li Y, Cao X. The RNA m 6A demethylase ALKBH5 drives emergency granulopoiesis and neutrophil mobilization by upregulating G-CSFR expression. Cell Mol Immunol 2024; 21:6-18. [PMID: 38114747 PMCID: PMC10757716 DOI: 10.1038/s41423-023-01115-9] [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: 03/10/2023] [Accepted: 11/29/2023] [Indexed: 12/21/2023] Open
Abstract
Emergency granulopoiesis and neutrophil mobilization that can be triggered by granulocyte colony-stimulating factor (G-CSF) through its receptor G-CSFR are essential for antibacterial innate defense. However, the epigenetic modifiers crucial for intrinsically regulating G-CSFR expression and the antibacterial response of neutrophils remain largely unclear. N6-methyladenosine (m6A) RNA modification and the related demethylase alkB homolog 5 (ALKBH5) are key epigenetic regulators of immunity and inflammation, but their roles in neutrophil production and mobilization are still unknown. We used cecal ligation and puncture (CLP)-induced polymicrobial sepsis to model systemic bacterial infection, and we report that ALKBH5 is required for emergency granulopoiesis and neutrophil mobilization. ALKBH5 depletion significantly impaired the production of immature neutrophils in the bone marrow of septic mice. In addition, Alkbh5-deficient septic mice exhibited higher retention of mature neutrophils in the bone marrow and defective neutrophil release into the circulation, which led to fewer neutrophils at the infection site than in their wild-type littermates. During bacterial infection, ALKBH5 imprinted production- and mobilization-promoting transcriptome signatures in both mouse and human neutrophils. Mechanistically, ALKBH5 erased m6A methylation on the CSF3R mRNA to increase the mRNA stability and protein expression of G-CSFR, consequently upregulating cell surface G-CSFR expression and downstream STAT3 signaling in neutrophils. The RIP-qPCR results confirmed the direct binding of ALKBH5 to the CSF3R mRNA, and the binding strength declined upon bacterial infection, accounting for the decrease in G-CSFR expression on bacteria-infected neutrophils. Considering these results collectively, we define a new role of ALKBH5 in intrinsically driving neutrophil production and mobilization through m6A demethylation-dependent posttranscriptional regulation, indicating that m6A RNA modification in neutrophils is a potential target for treating bacterial infections and neutropenia.
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Affiliation(s)
- Yang Liu
- Department of Immunology, Center for Immunotherapy, Institute of Basic Medical Sciences, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China.
- Suzhou Institute of Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China.
- Frontier Research Center for Cell Response, Institute of Immunology, College of Life Sciences, Nankai University, Tianjin, China.
| | - Renjie Song
- Department of Immunology, Center for Immunotherapy, Institute of Basic Medical Sciences, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Zhike Lu
- School of Life Sciences, Westlake University, Hangzhou, China
| | - Lu Zhao
- Department of Immunology, Center for Immunotherapy, Institute of Basic Medical Sciences, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Xinyi Zhan
- Department of Immunology, Center for Immunotherapy, Institute of Basic Medical Sciences, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
| | - Yini Li
- School of Life Sciences, Westlake University, Hangzhou, China
| | - Xuetao Cao
- Department of Immunology, Center for Immunotherapy, Institute of Basic Medical Sciences, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China
- Suzhou Institute of Systems Medicine, Chinese Academy of Medical Sciences, Suzhou, China
- Frontier Research Center for Cell Response, Institute of Immunology, College of Life Sciences, Nankai University, Tianjin, China
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2
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Williams O, Hu L, Huang W, Patel P, Bartom ET, Bei L, Hjort E, Hijiya C, Eklund EA. Nore1 inhibits age-associated myeloid lineage skewing and clonal hematopoiesis but facilitates termination of emergency (stress) granulopoiesis. J Biol Chem 2023; 299:104867. [PMID: 37247756 PMCID: PMC10404618 DOI: 10.1016/j.jbc.2023.104867] [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: 10/20/2022] [Revised: 05/18/2023] [Accepted: 05/21/2023] [Indexed: 05/31/2023] Open
Abstract
Age-associated bone marrow changes include myeloid skewing and mutations that lead to clonal hematopoiesis. Molecular mechanisms for these events are ill defined, but decreased expression of Irf8/Icsbp (interferon regulatory factor 8/interferon consensus sequence binding protein) in aging hematopoietic stem cells may contribute. Irf8 functions as a leukemia suppressor for chronic myeloid leukemia, and young Irf8-/- mice have neutrophilia with progression to acute myeloid leukemia (AML) with aging. Irf8 is also required to terminate emergency granulopoiesis during the innate immune response, suggesting this may be the physiologic counterpart to leukemia suppression by this transcription factor. Identifying Irf8 effectors may define mediators of both events and thus contributors to age-related bone marrow disorders. In this study, we identified RASSF5 (encoding Nore1) as an Irf8 target gene and investigated the role of Nore1 in hematopoiesis. We found Irf8 activates RASSF5 transcription and increases Nore1a expression during emergency granulopoiesis. Similar to Irf8-/- mice, we found that young Rassf5-/- mice had increased neutrophils and progressed to AML with aging. We identified enhanced DNA damage, excess clonal hematopoiesis, and a distinct mutation profile in hematopoietic stem cells from aging Rassf5-/- mice compared with wildtype. We found sustained emergency granulopoiesis in Rassf5-/- mice, with repeated episodes accelerating AML, also similar to Irf8-/- mice. Identifying Nore1a downstream from Irf8 defines a pathway involved in leukemia suppression and the innate immune response and suggests a novel molecular mechanism contributing to age-related clonal myeloid disorders.
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Affiliation(s)
- Olatundun Williams
- Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center, New York, New York, USA
| | - Liping Hu
- The Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA; Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois, USA
| | - Weiqi Huang
- The Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA; Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois, USA; Medicine Service, Jesse Brown VA Medical Center, Chicago, Illinois, USA
| | - Priyam Patel
- The Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA; Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois, USA
| | - Elizabeth T Bartom
- The Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA; Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois, USA
| | - Ling Bei
- RxD Nova Pharmaceuticals, Inc, Vacaville, California, USA
| | | | - Christina Hijiya
- Yale School of Public Health, Yale University, New Haven, Connecticut, USA
| | - Elizabeth A Eklund
- The Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA; Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois, USA; Medicine Service, Jesse Brown VA Medical Center, Chicago, Illinois, USA.
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3
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Ma W, Wan Y, Zhang J, Yao J, Wang Y, Lu J, Liu H, Huang X, Zhang X, Zhou H, He Y, Wu D, Wang J, Zhao Y. Growth arrest‐specific protein 2 (
GAS2
) interacts with
CXCR4
to promote T‐cell leukemogenesis partially via
c‐MYC. Mol Oncol 2022; 16:3720-3734. [PMID: 36054080 PMCID: PMC9580887 DOI: 10.1002/1878-0261.13306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 08/08/2022] [Accepted: 08/19/2022] [Indexed: 11/29/2022] Open
Abstract
Although growth arrest‐specific protein 2 (GAS2) promotes the growth of T‐cell acute lymphoblastic leukemia (T‐ALL) cells in culture, the effect of GAS2 on T‐cell leukemogenesis has not been studied, and the mechanism remains unclear. In the present study, xenograft studies showed that GAS2 silencing impaired T‐cell leukemogenesis and decreased leukemic cell infiltration. Mechanistically, GAS2 regulated the protein expression of C‐X‐C chemokine receptor type 4 (CXCR4) rather than its transcript expression. Immunoprecipitation revealed that GAS2 interacted with CXCR4, and confocal analysis showed that GAS2 was partially co‐expressed with CXCR4, which provided a strong molecular basis for GAS2 to regulate CXCR4 expression. Importantly, CXCR4 overexpression alleviated the inhibitory effect of GAS2 silencing on the growth and migration of T‐ALL cells. Moreover, GAS2 or CXCR4 silencing inhibited the expression of NOTCH1 and c‐MYC. Forced expression of c‐MYC rescued the growth suppression induced by GAS2 or CXCR4 silencing. Meanwhile, GAS2 deficiency, specifically in blood cells, had a mild effect on normal hematopoiesis, including T‐cell development, and GAS2 silencing did not affect the growth of normal human CD3+ or CD34+ cells. Overall, our data indicate that GAS2 promotes T‐cell leukemogenesis through its interaction with CXCR4 to activate NOTCH1/c‐MYC, whereas impaired GAS2 expression has a mild effect on normal hematopoiesis. Therefore, our study suggests that targeting the GAS2/CXCR4 axis is a potential therapeutic strategy for T‐ALL.
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Affiliation(s)
- Wenjuan Ma
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
| | - Yan Wan
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
| | - Jianxiang Zhang
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
| | - Jianan Yao
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
| | - Yifei Wang
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
| | - Jinchang Lu
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
| | - Hong Liu
- The First Affiliated Hospital of Soochow University Key Laboratory of Thrombosis and Hemostasis, Ministry of Health Suzhou 215006 China
- National Clinical Research Center for Hematologic Diseases Suzhou 215006 China
| | - Xiaorui Huang
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
| | - Xiuyan Zhang
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
| | - Haixia Zhou
- The First Affiliated Hospital of Soochow University Key Laboratory of Thrombosis and Hemostasis, Ministry of Health Suzhou 215006 China
- National Clinical Research Center for Hematologic Diseases Suzhou 215006 China
| | - Yulong He
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
- National Clinical Research Center for Hematologic Diseases Suzhou 215006 China
- Cam‐Su Genomic Resources Center Soochow University Suzhou 215123 China
- State Key Laboratory of Radiation Medicine and Radioprotection Soochow University Suzhou 215123 China
- MOE Engineering Center of Hematological Disease Soochow University Suzhou 215123 China
| | - Depei Wu
- The First Affiliated Hospital of Soochow University Key Laboratory of Thrombosis and Hemostasis, Ministry of Health Suzhou 215006 China
- National Clinical Research Center for Hematologic Diseases Suzhou 215006 China
- MOE Engineering Center of Hematological Disease Soochow University Suzhou 215123 China
| | - Jianrong Wang
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
- National Clinical Research Center for Hematologic Diseases Suzhou 215006 China
- State Key Laboratory of Radiation Medicine and Radioprotection Soochow University Suzhou 215123 China
- MOE Engineering Center of Hematological Disease Soochow University Suzhou 215123 China
- Key Laboratory of Stem Cells and Biomedical Materials of Jiangsu Province and Chinese Ministry of Science and Technology Suzhou 215123 China
| | - Yun Zhao
- Cyrus Tang Medical Institute, Collaborative Innovation Center of Hematology Soochow University Suzhou 215123 China
- National Clinical Research Center for Hematologic Diseases Suzhou 215006 China
- MOE Engineering Center of Hematological Disease Soochow University Suzhou 215123 China
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4
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Pulianmackal AJ, Kanakousaki K, Flegel KA, Grushko OG, Gourley E, Rozich E, Buttitta LA. Misregulation of the Nucleoporins 98 and 96 lead to defects in protein synthesis that promote hallmarks of tumorigenesis. Dis Model Mech 2022; 15:274202. [PMID: 35107131 PMCID: PMC8938402 DOI: 10.1242/dmm.049234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 01/15/2022] [Indexed: 11/20/2022] Open
Abstract
Nucleoporin 98KD (Nup98) is a promiscuous translocation partner in hematological malignancies. Most disease models of Nup98 translocations involve ectopic expression of the fusion protein under study, leaving the endogenous Nup98 loci unperturbed. Overlooked in these approaches is the loss of one copy of normal Nup98 in addition to the loss of Nup96 – a second Nucleoporin encoded within the same mRNA and reading frame as Nup98 – in translocations. Nup98 and Nup96 are also mutated in a number of other cancers, suggesting that their disruption is not limited to blood cancers. We found that reducing Nup98-96 function in Drosophila melanogaster (in which the Nup98-96 shared mRNA and reading frame is conserved) de-regulates the cell cycle. We found evidence of overproliferation in tissues with reduced Nup98-96, counteracted by elevated apoptosis and aberrant signaling associated with chronic wounding. Reducing Nup98-96 function led to defects in protein synthesis that triggered JNK signaling and contributed to hallmarks of tumorigenesis when apoptosis was inhibited. We suggest that partial loss of Nup98-96 function in translocations could de-regulate protein synthesis, leading to signaling that cooperates with other mutations to promote tumorigenesis. Editor's choice: Compromising Nucleoporins 98 and 96 leads to defects in protein synthesis and stress signaling via JNK that triggers compensatory and apoptosis-induced proliferation.
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Affiliation(s)
- Ajai J Pulianmackal
- Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Kiriaki Kanakousaki
- Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Kerry A Flegel
- Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Olga G Grushko
- Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Ella Gourley
- Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Emily Rozich
- Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Laura A Buttitta
- Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
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5
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Paudel S, Ghimire L, Jin L, Jeansonne D, Jeyaseelan S. Regulation of emergency granulopoiesis during infection. Front Immunol 2022; 13:961601. [PMID: 36148240 PMCID: PMC9485265 DOI: 10.3389/fimmu.2022.961601] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Accepted: 08/15/2022] [Indexed: 11/13/2022] Open
Abstract
During acute infectious and inflammatory conditions, a large number of neutrophils are in high demand as they are consumed in peripheral organs. The hematopoietic system rapidly responds to the demand by turning from steady state to emergency granulopoiesis to expedite neutrophil generation in the bone marrow (BM). How the hematopoietic system integrates pathogenic and inflammatory stress signals into the molecular cues of emergency granulopoiesis has been the subject of investigations. Recent studies in the field have highlighted emerging concepts, including the direct sensing of pathogens by BM resident or sentinel hematopoietic stem and progenitor cells (HSPCs), the crosstalk of HSPCs, endothelial cells, and stromal cells to convert signals to granulopoiesis, and the identification of novel inflammatory molecules, such as C/EBP-β, ROS, IL-27, IFN-γ, CXCL1 with direct effects on HSPCs. In this review, we will provide a detailed account of emerging concepts while reassessing well-established cellular and molecular players of emergency granulopoiesis. While providing our views on the discrepant results and theories, we will postulate an updated model of granulopoiesis in the context of health and disease.
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Affiliation(s)
- Sagar Paudel
- Center for Lung Biology and Disease, Louisiana State University (LSU) School of Veterinary Medicine, Baton Rouge, LA, United States.,Department of Pathobiological Sciences, Louisiana State University (LSU) School of Veterinary Medicine, Baton Rouge, LA, United States
| | - Laxman Ghimire
- Center for Lung Biology and Disease, Louisiana State University (LSU) School of Veterinary Medicine, Baton Rouge, LA, United States.,Department of Pathobiological Sciences, Louisiana State University (LSU) School of Veterinary Medicine, Baton Rouge, LA, United States
| | - Liliang Jin
- Center for Lung Biology and Disease, Louisiana State University (LSU) School of Veterinary Medicine, Baton Rouge, LA, United States.,Department of Pathobiological Sciences, Louisiana State University (LSU) School of Veterinary Medicine, Baton Rouge, LA, United States
| | - Duane Jeansonne
- Center for Lung Biology and Disease, Louisiana State University (LSU) School of Veterinary Medicine, Baton Rouge, LA, United States.,Department of Pathobiological Sciences, Louisiana State University (LSU) School of Veterinary Medicine, Baton Rouge, LA, United States
| | - Samithamby Jeyaseelan
- Center for Lung Biology and Disease, Louisiana State University (LSU) School of Veterinary Medicine, Baton Rouge, LA, United States.,Department of Pathobiological Sciences, Louisiana State University (LSU) School of Veterinary Medicine, Baton Rouge, LA, United States.,Section of Pulmonary and Critical Care, Department of Medicine, LSU Health Sciences Center, New Orleans, LA, United States
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6
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Lack of Interferon Regulatory Factor 8 Associated with Restricted IFN-gamma expression Augmented Japanese Encephalitis Virus Replication in the Mouse Brain. J Virol 2021; 95:e0040621. [PMID: 34379515 PMCID: PMC8513486 DOI: 10.1128/jvi.00406-21] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Interferon Regulatory Factor 8 (IRF8), a myeloid lineage transcription factor, emerges as an essential regulator for microglia activation. However, the precise role of IRF8 during Japanese encephalitis virus (JEV) infection in the brain remains elusive. Here we report that JEV infection enhances IRF8 expression in the infected mice brain. Comparative transcriptional profiling of whole-brain RNA analysis and validation by qRT-PCR reveals an impaired IFNγ and related gene expression in Irf8 knockout (Irf8-/-) infected mice. Further, Ifnγ knockout (Ifnγ-/-) mice exhibit a reduced level of Irf8. Both Ifnγ-/- and Irf8-/- mice exhibit significantly reduced levels of activated (CD11b+CD45hi, CD11b+CD45lo, Cd68, and CD86) and infiltrating immune cells (Ly6C+, CD4, and CD8) in the infected brain as compared to WT mice. However, a higher level of granulocyte cells (Ly6G+) infiltration is evident in Irf8-/- mice and the increased concentration of TNFα, IL6, MCP1 levels in the brain. Interestingly, neither Irf8-/- nor Ifnγ-/- has conferred protection against lethal JEV challenge to mice and exhibits augmentation in JEV replication in the brain. The gain of function of Irf8 by overexpressing functional IRF8 in an IRF8 deficient cell line attenuates viral replication and enhances IFNγ production. Overall, we summarise that in the murine model of JEV encephalitis, IRF8 modulation affects JEV replication. We also evidence that lack of Irf8 affects immune cells abundance in circulation and the infected brain leading to a reduction in IFNγ level and increased viral load in the brain. Importance Microglial cells, the resident macrophages in the brain, play a vital role in Japanese encephalitis virus (JEV) pathogenesis. The deregulated activity of microglia can be lethal for the brain. Therefore, it is crucial to understand the regulators that drive microglia's phenotype changes and induce inflammation in the brain. Interferon regulatory factor 8 (IRF8) is a myeloid lineage transcription factor involved in microglial activation. However, the impact of IRF8 modulation on JEV replication remains elusive. Moreover, the pathways regulated by IRF8 to initiate and amplify pathological neuroinflammation are not well understood. Here, we demonstrated the effect of IRF8 modulation on JEV replication, microglial activation, and immune cells infiltration in the brain.
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7
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Olson OC, Kang YA, Passegué E. Normal Hematopoiesis Is a Balancing Act of Self-Renewal and Regeneration. Cold Spring Harb Perspect Med 2020; 10:cshperspect.a035519. [PMID: 31988205 DOI: 10.1101/cshperspect.a035519] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The hematopoietic system is highly organized to maintain its functional integrity and to meet lifelong organismal demands. Hematopoietic stem cells (HSCs) must balance self-renewal with differentiation and the regeneration of the blood system. It is a complex balancing act between these competing HSC functions. Although highly quiescent at steady state, HSCs become activated in response to inflammatory cytokines and regenerative challenges. This activation phase leads to many intrinsic stresses such as replicative, metabolic, and oxidative stress, which can cause functional decline, impaired self-renewal, and exhaustion of HSCs. To cope with these insults, HSCs use both built-in and emergency-triggered stress-response mechanisms to maintain homeostasis and to defend against disease development. In this review, we discuss how the hematopoietic system operates in steady state and stress conditions, what strategies are used to maintain functional integrity, and how deregulation in the balance between self-renewal and regeneration can drive malignant transformation.
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Affiliation(s)
- Oakley C Olson
- Columbia Stem Cell Initiative, Department of Genetics & Development, Columbia University Irving Medical Center, New York, New York 10032, USA
| | - Yoon-A Kang
- Columbia Stem Cell Initiative, Department of Genetics & Development, Columbia University Irving Medical Center, New York, New York 10032, USA
| | - Emmanuelle Passegué
- Columbia Stem Cell Initiative, Department of Genetics & Development, Columbia University Irving Medical Center, New York, New York 10032, USA
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8
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Zhang N, Zhao C, Zhang X, Cui X, Zhao Y, Yang J, Gao X. Growth arrest-specific 2 protein family: Structure and function. Cell Prolif 2020; 54:e12934. [PMID: 33103301 PMCID: PMC7791176 DOI: 10.1111/cpr.12934] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 09/29/2020] [Accepted: 10/03/2020] [Indexed: 12/15/2022] Open
Abstract
Members of the growth arrest–specific 2 (GAS2) protein family consist of a putative actin‐binding (CH) domain and a microtubule‐binding (GAR) domain and are considered miniversions of spectraplakins. There are four members in the GAS2 family, viz. GAS2, GAS2L1, GAS2L2 and GAS2L3. Although GAS2 is defined as a family of growth arrest–specific proteins, the significant differences in the expression patterns, interaction characteristics and biological issues or diseases among the different GAS2 family members have not been systemically reviewed to date. Therefore, we summarized the available evidence on the structures and functions of GAS2 family members. This review facilitates a comprehensive molecular understanding of the involvement of the GAS2 family members in an array of biological processes, including cytoskeleton reorganization, cell cycle, apoptosis and cancer development.
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Affiliation(s)
- Nan Zhang
- Department of Biochemistry and Molecular Biology, Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Key Laboratory of Immune Microenvironment and Disease, Ministry of Education, Key Laboratory of Cellular and Molecular Immunology in Tianjin, Excellent Talent Project, Tianjin Medical University, Tianjin, China
| | - Chunyan Zhao
- Department of Biochemistry and Molecular Biology, Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Key Laboratory of Immune Microenvironment and Disease, Ministry of Education, Key Laboratory of Cellular and Molecular Immunology in Tianjin, Excellent Talent Project, Tianjin Medical University, Tianjin, China
| | - Xinxin Zhang
- Department of Biochemistry and Molecular Biology, Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Key Laboratory of Immune Microenvironment and Disease, Ministry of Education, Key Laboratory of Cellular and Molecular Immunology in Tianjin, Excellent Talent Project, Tianjin Medical University, Tianjin, China
| | - Xiaoteng Cui
- Department of Biochemistry and Molecular Biology, Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Key Laboratory of Immune Microenvironment and Disease, Ministry of Education, Key Laboratory of Cellular and Molecular Immunology in Tianjin, Excellent Talent Project, Tianjin Medical University, Tianjin, China.,Laboratory of Neuro-Oncology, Tianjin Neurological Institute, Department of Neurosurgery, Tianjin Medical University General Hospital and Key Laboratory of Neurotrauma, Variation, and Regeneration, Ministry of Education and Tianjin Municipal Government, Tianjin, China
| | - Yan Zhao
- Department of Biochemistry and Molecular Biology, Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Key Laboratory of Immune Microenvironment and Disease, Ministry of Education, Key Laboratory of Cellular and Molecular Immunology in Tianjin, Excellent Talent Project, Tianjin Medical University, Tianjin, China
| | - Jie Yang
- Department of Biochemistry and Molecular Biology, Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Key Laboratory of Immune Microenvironment and Disease, Ministry of Education, Key Laboratory of Cellular and Molecular Immunology in Tianjin, Excellent Talent Project, Tianjin Medical University, Tianjin, China
| | - Xingjie Gao
- Department of Biochemistry and Molecular Biology, Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China.,Key Laboratory of Immune Microenvironment and Disease, Ministry of Education, Key Laboratory of Cellular and Molecular Immunology in Tianjin, Excellent Talent Project, Tianjin Medical University, Tianjin, China
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9
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Huang W, Liu B, Eklund EA. Investigating the role of the innate immune response in relapse or blast crisis in chronic myeloid leukemia. Leukemia 2020; 34:2364-2374. [PMID: 32080344 PMCID: PMC7438233 DOI: 10.1038/s41375-020-0771-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 02/08/2020] [Accepted: 02/12/2020] [Indexed: 01/04/2023]
Abstract
Chronic myeloid leukemia (CML) is characterized by expression of the tyrosine kinase oncogene, Bcr–abl. Tyrosine kinase inhibitors (TKI) induce prolonged remission in CML, and therapy discontinuation is an accepted approach to patients with reduction in Bcr–abl transcripts of four logs or greater. Half such individuals sustain a therapy free remission, but molecular mechanisms predicting relapse are undefined. We found relative calpain inhibition in CML cells with stabilization of calpain substrates, including βcatenin and Xiap1. Since the Survivin gene is activated by βcatenin, this identified two apoptosis-resistance mechanisms. We found that Survivin impaired apoptosis in leukemia stem cells (LSCs) and Xiap1 in CML granulocytes. Consistent with this, we determined treatment with an inhibitor of Survivin, but not Xiap1, prevented relapse during TKI treatment and after therapy discontinuation in a murine CML model. By transcriptome profiling, we identified activation of innate immune response pathways in murine CML bone marrow progenitors. This was increased by TKI treatment alone, but normalized with addition of a Survivin inhibitor. We found that activation of the innate immune response induced rapid blast crisis in untreated CML mice, and chronic phase relapse during a TKI discontinuation attempt. These results suggest that extrinsic stress exerts adverse effects on CML-LSCs.
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Affiliation(s)
- Weiqi Huang
- The Feinberg School, Northwestern University, Chicago, IL, USA.,Jesse Brown Veterans Health Administration Medical Center, Chicago, IL, USA
| | - Bin Liu
- The Feinberg School, Northwestern University, Chicago, IL, USA
| | - Elizabeth A Eklund
- The Feinberg School, Northwestern University, Chicago, IL, USA. .,Jesse Brown Veterans Health Administration Medical Center, Chicago, IL, USA.
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10
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Melero-Jerez C, Suardíaz M, Lebrón-Galán R, Marín-Bañasco C, Oliver-Martos B, Machín-Díaz I, Fernández Ó, de Castro F, Clemente D. The presence and suppressive activity of myeloid-derived suppressor cells are potentiated after interferon-β treatment in a murine model of multiple sclerosis. Neurobiol Dis 2019; 127:13-31. [PMID: 30798007 DOI: 10.1016/j.nbd.2019.02.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 12/13/2018] [Accepted: 02/20/2019] [Indexed: 02/06/2023] Open
Abstract
Multiple sclerosis (MS) is an autoimmune demyelinating disease of the human central nervous system (CNS), mainly affecting young adults. Among the immunomodulatory disease modifying treatments approved up to date to treat MS, IFN-β remains to be one of the most widely prescribed for the Relapsing-Remitting (RR) variant of the disease, although its mechanism of action is still partially understood. RR-MS variant is characterized by phases with increasing neurological symptoms (relapses) followed by periods of total or partial recovery (remissions), which implies the existence of immunomodulatory agents to promote the relapsing-to-remitting transition. Among these agents, it has been described the immunosuppressive role of a heterogeneous population of immature myeloid cells, namely the myeloid-derived suppressor cells (MDSCs) during the clinical course of the experimental autoimmune encephalomyelitis (EAE), the most used MS model to study RRMS. However, it is still unknown how the current MS disease modifying treatments, e.g. IFN- β, affects to MDSCs number or activity. Our present results show that a single injection of IFN-β at the onset of the clinical course reduces the severity of the EAE, enhancing the presence of MDSCs within the smaller demyelinated areas. Moreover, the single dose of IFN-β promotes MDSC immunosuppressive activity both in vivo and in vitro, augmenting T cell apoptosis. Finally, we show that IFN-ß preserves MDSC immaturity, preventing their differentiation to mature and less suppressive myeloid cell subsets. Taking together, all these data add new insights into the mechanism of IFN-β treatment in EAE and point to MDSCs as a putative endogenous mediator of its beneficial role in this animal model of MS.
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Affiliation(s)
- Carolina Melero-Jerez
- Grupo de Neuroinmuno-Reparación, Hospital Nacional de Parapléjicos, Finca La Peraleda s/n, 45071 Toledo, Spain; Grupo de Neurobiología del Desarrollo-GNDe, Instituto Cajal-CSIC, Avenida Doctor Arce 37, 28002 Madrid, Spain
| | - Margarita Suardíaz
- Unidad de Gestión Clínica Inter-centros de Neurociencias, Laboratorio de Investigación y Servicio de Neurología, Instituto de Investigación Biomédica de Málaga (IBIMA), Hospital Regional Universitario de Málaga, Madrid, Spain
| | - Rafael Lebrón-Galán
- Grupo de Neuroinmuno-Reparación, Hospital Nacional de Parapléjicos, Finca La Peraleda s/n, 45071 Toledo, Spain
| | - Carmen Marín-Bañasco
- Unidad de Gestión Clínica Inter-centros de Neurociencias, Laboratorio de Investigación y Servicio de Neurología, Instituto de Investigación Biomédica de Málaga (IBIMA), Hospital Regional Universitario de Málaga, Madrid, Spain
| | - Begoña Oliver-Martos
- Unidad de Gestión Clínica Inter-centros de Neurociencias, Laboratorio de Investigación y Servicio de Neurología, Instituto de Investigación Biomédica de Málaga (IBIMA), Hospital Regional Universitario de Málaga, Madrid, Spain
| | - Isabel Machín-Díaz
- Grupo de Neuroinmuno-Reparación, Hospital Nacional de Parapléjicos, Finca La Peraleda s/n, 45071 Toledo, Spain
| | - Óscar Fernández
- Unidad de Gestión Clínica Inter-centros de Neurociencias, Laboratorio de Investigación y Servicio de Neurología, Instituto de Investigación Biomédica de Málaga (IBIMA), Hospital Regional Universitario de Málaga, Madrid, Spain
| | - Fernando de Castro
- Grupo de Neurobiología del Desarrollo-GNDe, Instituto Cajal-CSIC, Avenida Doctor Arce 37, 28002 Madrid, Spain.
| | - Diego Clemente
- Grupo de Neuroinmuno-Reparación, Hospital Nacional de Parapléjicos, Finca La Peraleda s/n, 45071 Toledo, Spain.
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11
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Bigley V, Maisuria S, Cytlak U, Jardine L, Care MA, Green K, Gunawan M, Milne P, Dickinson R, Wiscombe S, Parry D, Doffinger R, Laurence A, Fonseca C, Stoevesandt O, Gennery A, Cant A, Tooze R, Simpson AJ, Hambleton S, Savic S, Doody G, Collin M. Biallelic interferon regulatory factor 8 mutation: A complex immunodeficiency syndrome with dendritic cell deficiency, monocytopenia, and immune dysregulation. J Allergy Clin Immunol 2018; 141:2234-2248. [PMID: 29128673 PMCID: PMC5986711 DOI: 10.1016/j.jaci.2017.08.044] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 08/08/2017] [Accepted: 08/31/2017] [Indexed: 12/22/2022]
Abstract
BACKGROUND The homozygous K108E mutation of interferon regulatory factor 8 (IRF8) is reported to cause dendritic cell (DC) and monocyte deficiency. However, more widespread immune dysfunction is predicted from the multiple roles ascribed to IRF8 in immune cell development and function. OBJECTIVE We sought to describe the effect on hematopoiesis and immunity of the compound heterozygous R83C/R291Q mutation of IRF8, which is present in a patient with recurrent viral infection, granuloproliferation, and intracerebral calcification. METHODS Variant IRF8 alleles were identified by means of exome sequencing, and their function was tested by using reporter assays. The cellular phenotype was studied in detail by using flow cytometry, functional immunologic assay transcriptional profiling, and antigen receptor profiling. RESULTS Both mutations affected conserved residues, and R291Q is orthologous to R294, which is mutated in the BXH2 IRF8-deficient mouse. R83C showed reduced nuclear translocation, and neither mutant was able to regulate the Ets/IRF composite element or interferon-stimulated response element, whereas R291Q retained BATF/JUN interactions. DC deficiency and monocytopenia were observed in blood, dermis, and lung lavage fluid. Granulocytes were consistently increased, dysplastic, and hypofunctional. Natural killer cell development and maturation were arrested. TH1, TH17, and CD8+ memory T-cell differentiation was significantly reduced, and T cells did not express CXCR3. B-cell development was impaired, with fewer memory cells, reduced class-switching, and lower frequency and complexity of somatic hypermutation. Cell-specific gene expression was widely disturbed in interferon- and IRF8-regulated transcripts. CONCLUSIONS This analysis defines the clinical features of human biallelic IRF8 deficiency, revealing a complex immunodeficiency syndrome caused by DC and monocyte deficiency combined with widespread immune dysregulation.
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Affiliation(s)
- Venetia Bigley
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom; Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom.
| | - Sheetal Maisuria
- Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, United Kingdom
| | - Urszula Cytlak
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Laura Jardine
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom; Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
| | - Matthew A Care
- Leeds Institute of Cancer and Pathology, University of Leeds, Leeds, United Kingdom
| | - Kile Green
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Merry Gunawan
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Paul Milne
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Rachel Dickinson
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Sarah Wiscombe
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - David Parry
- Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, United Kingdom
| | - Rainer Doffinger
- Department of Clinical Biochemistry and Immunology, Addenbrookes Hospital, Cambridge, United Kingdom
| | - Arian Laurence
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom; Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
| | - Claudia Fonseca
- Cambridge Protein Arrays, Babraham Research Campus, Cambridge, United Kingdom
| | - Oda Stoevesandt
- Cambridge Protein Arrays, Babraham Research Campus, Cambridge, United Kingdom
| | - Andrew Gennery
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom; Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
| | - Andrew Cant
- Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
| | - Reuben Tooze
- Leeds Institute of Cancer and Pathology, University of Leeds, Leeds, United Kingdom
| | - A John Simpson
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom; Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
| | - Sophie Hambleton
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom; Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
| | - Sinisa Savic
- National Institute for Health Research-Leeds Musculoskeletal Biomedical Research Unit and Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, United Kingdom
| | - Gina Doody
- Leeds Institute of Cancer and Pathology, University of Leeds, Leeds, United Kingdom
| | - Matthew Collin
- Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom; Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
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12
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Gianni M, Fratelli M, Bolis M, Kurosaki M, Zanetti A, Paroni G, Rambaldi A, Borleri G, Rochette-Egly C, Terao M, Garattini E. RARα2 and PML-RAR similarities in the control of basal and retinoic acid induced myeloid maturation of acute myeloid leukemia cells. Oncotarget 2018; 8:37041-37060. [PMID: 27419624 PMCID: PMC5514891 DOI: 10.18632/oncotarget.10556] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 07/01/2016] [Indexed: 02/02/2023] Open
Abstract
Treatment of acute promyelocytic leukemia (APL) with all-trans retinoic acid (ATRA) is the first example of targeted therapy. In fact, the oncogenic fusion-protein (PML-RAR) typical of this leukemia contains the retinoid-nuclear-receptor RARα. PML-RAR is responsible for the differentiation block of the leukemic blast. Besides PML-RAR, two endogenous RARα proteins are present in APL blasts, i.e. RARα1 and RARα2. We developed different cell populations characterized by PML-RAR, RARα2 and RARα1 knock-down in the APL-derived NB4 cell-line. Unexpectedly, silencing of PML-RAR and RARα2 results in similar increases in the constitutive expression of several granulocytic differentiation markers. This is accompanied by enhanced expression of the same granulocytic markers upon exposure of the NB4 blasts to ATRA. Silencing of PML-RAR and RARα2 causes also similar perturbations in the whole genome gene-expression profiles of vehicle and ATRA treated NB4 cells. Unlike PML-RAR and RARα2, RARα1 knock-down blocks ATRA-dependent induction of several granulocytic differentiation markers. Many of the effects on myeloid differentiation are confirmed by over-expression of RARα2 in NB4 cells. RARα2 action on myeloid differentiation does not require the presence of PML-RAR, as it is recapitulated also upon knock-down in PML-RAR-negative HL-60 cells. Thus, relative to RARα1, PML-RAR and RARα2 exert opposite effects on APL-cell differentiation. These contrasting actions may be related to the fact that both PML-RAR and RARα2 interact with and inhibit the transcriptional activity of RARα1. The interaction surface is located in the carboxy-terminal domain containing the D/E/F regions and it is influenced by phosphorylation of Ser-369 of RARα1.
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Affiliation(s)
- Maurizio Gianni
- Laboratory of Molecular Biology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", 20156 Milano, Italy
| | - Maddalena Fratelli
- Laboratory of Molecular Biology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", 20156 Milano, Italy
| | - Marco Bolis
- Laboratory of Molecular Biology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", 20156 Milano, Italy
| | - Mami Kurosaki
- Laboratory of Molecular Biology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", 20156 Milano, Italy
| | - Adriana Zanetti
- Laboratory of Molecular Biology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", 20156 Milano, Italy
| | - Gabriela Paroni
- Laboratory of Molecular Biology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", 20156 Milano, Italy
| | - Alessandro Rambaldi
- Hematology and Bone Marrow Transplant Unit, Azienda Ospedaliera Papa Giovanni XXIII, 24127 Bergamo, Italy
| | - Gianmaria Borleri
- Hematology and Bone Marrow Transplant Unit, Azienda Ospedaliera Papa Giovanni XXIII, 24127 Bergamo, Italy
| | - Cecile Rochette-Egly
- Department of Functional Genomics and Cancer, IGBMC (Institut de Génétique et de Biologie Moléculaire et Cellulaire), INSERM, U964, CNRS, UMR7104, Université de Strasbourg, 67404 Illkirch Cedex, France
| | - Mineko Terao
- Laboratory of Molecular Biology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", 20156 Milano, Italy
| | - Enrico Garattini
- Laboratory of Molecular Biology, IRCCS-Istituto di Ricerche Farmacologiche "Mario Negri", 20156 Milano, Italy
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13
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Hasan S, Naqvi AR, Rizvi A. Transcriptional Regulation of Emergency Granulopoiesis in Leukemia. Front Immunol 2018; 9:481. [PMID: 29593731 PMCID: PMC5858521 DOI: 10.3389/fimmu.2018.00481] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 02/23/2018] [Indexed: 12/16/2022] Open
Abstract
Neutropenic conditions are prevalent in leukemia patients and are often associated with increased susceptibility to infections. In fact, emergency granulopoiesis (EG), a process regulating neutrophil homeostasis in inflammatory conditions and infections, may occur improperly in leukemic conditions, leading to reduced neutrophil counts. Unfortunately, the mechanisms central to dysfunctional EG remain understudied in both leukemia patients and leukemic mouse models. However, despite no direct studies on EG response in leukemia are reported, recently certain transcription factors (TFs) have been found to function at the crossroads of leukemia and EG. In this review, we present an update on TFs that can potentially govern the fate of EG in leukemia. Transcriptional control of Fanconi DNA repair pathway genes is also highlighted, as well as the newly discovered role of Fanconi proteins in innate immune response and EG. Identifying the TFs regulating EG in leukemia and dissecting their underlying mechanisms may facilitate the discovery of therapeutic drugs for the treatment of neutropenia.
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Affiliation(s)
- Shirin Hasan
- Feinberg School of Medicine, Northwestern University, Chicago, IL, United States
| | - Afsar R Naqvi
- Department of Periodontics, University of Illinois at Chicago, Chicago, IL, United States
| | - Asim Rizvi
- Department of Biochemistry, Aligarh Muslim University, Aligarh, India
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14
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Hu L, Huang W, Bei L, Broglie L, Eklund EA. TP53 Haploinsufficiency Rescues Emergency Granulopoiesis in FANCC-/- Mice. THE JOURNAL OF IMMUNOLOGY 2018; 200:2129-2139. [PMID: 29427417 DOI: 10.4049/jimmunol.1700931] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 01/14/2018] [Indexed: 01/09/2023]
Abstract
Emergency (stress) granulopoiesis is an episodic process for the production of granulocytes in response to infectious challenge. We previously determined that Fanconi C, a component of the Fanconi DNA-repair pathway, is necessary for successful emergency granulopoiesis. Fanconi anemia results from mutation of any gene in this pathway and is characterized by bone marrow failure (BMF) in childhood and clonal progression in adolescence. Although murine Fanconi anemia models exhibit relatively normal steady-state hematopoiesis, FANCC-/- mice are unable to mount an emergency granulopoiesis response. Instead, these mice develop BMF and die during repeated unsuccessful emergency granulopoiesis attempts. In FANCC-/- mice, BMF is associated with extensive apoptosis of hematopoietic stem and progenitor cells through an undefined mechanism. In this study, we find that TP53 haploinsufficiency completely rescues emergency granulopoiesis in FANCC-/- mice and protects them from BMF during repeated emergency granulopoiesis episodes. Instead, such recurrent challenges accelerated clonal progression in FANCC-/-TP53+/- mice. In FANCC-/- mice, BMF during multiple emergency granulopoiesis attempts was associated with increased ataxia telangiectasia and Rad3-related protein (Atr) and p53 activation with each attempt. In contrast, we found progressive attenuation of expression and activity of Atr, and consequent p53 activation and apoptosis, in the bone marrow of FANCC-/-TP53+/- mice during this process. Therefore, activation of Atr-with consequent Fanconi-mediated DNA repair or p53-dependent apoptosis-is an essential component of emergency granulopoiesis and it protects the bone marrow from genotoxic stress during this process.
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Affiliation(s)
- Liping Hu
- Northwestern University, Chicago, IL 60611
| | - Weiqi Huang
- Northwestern University, Chicago, IL 60611.,Jesse Brown VA Medical Center, Chicago, IL 60612; and
| | - Ling Bei
- Northwestern University, Chicago, IL 60611.,Jesse Brown VA Medical Center, Chicago, IL 60612; and
| | | | - Elizabeth A Eklund
- Northwestern University, Chicago, IL 60611; .,Jesse Brown VA Medical Center, Chicago, IL 60612; and
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15
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Shah CA, Broglie L, Hu L, Bei L, Huang W, Dressler DB, Eklund EA. Stat3 and CCAAT enhancer-binding protein β (C/ebpβ) activate Fanconi C gene transcription during emergency granulopoiesis. J Biol Chem 2018; 293:3937-3948. [PMID: 29382715 PMCID: PMC5857980 DOI: 10.1074/jbc.ra117.000528] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 01/25/2018] [Indexed: 01/06/2023] Open
Abstract
Interferon consensus sequence–binding protein (Icsbp) is required for terminating emergency granulopoiesis, an episodic event responsible for granulocyte production in response to infections and a key component of the innate immune response. Icsbp inhibits the expression of Stat3 and C/ebpβ, transcription factors essential for initiating and sustaining granulopoiesis, and activates transcription of Fanconi C (FANCC), a DNA repair protein. In prior studies, we noted accelerated bone marrow failure in Fancc−/− mice undergoing multiple episodes of emergency granulopoiesis, associated with apoptosis of bone marrow cells with unrepaired DNA damage. Additionally, we found increased expression of Fanconi C and F proteins during emergency granulopoiesis. These findings suggest that Icsbp protects the bone marrow from DNA damage by increasing activity of the Fanconi DNA repair pathway, but the mechanisms for FANCC activation during initiation of emergency granulopoiesis are unclear. In this study, we observed that Stat3 and C/ebpβ activate FANCC transcription and contribute to DNA repair. Our findings indicate that FancC expression is increased during Stat3- and C/ebpβ-induced initiation of emergency granulopoiesis by these transcription factors and is maintained through termination by Icsbp. Our work reveals that Stat3- and C/ebpβ-mediated FancC expression is a critical component for initiating and sustaining key innate immune responses.
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Affiliation(s)
- Chirag A Shah
- From the Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60605.,the Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois 60612, and
| | - Larisa Broglie
- the Children's Hospital of Wisconsin, Medical College of Wisconsin, Milwaukee, Wisconsin 53213
| | - Liping Hu
- From the Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60605
| | - Ling Bei
- From the Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60605.,the Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois 60612, and
| | - Weiqi Huang
- From the Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60605.,the Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois 60612, and
| | - Danielle B Dressler
- From the Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60605
| | - Elizabeth A Eklund
- From the Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60605, .,the Jesse Brown Veterans Affairs Medical Center, Chicago, Illinois 60612, and
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16
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Abstract
Purpose of review Dendritic cells are specialized antigen-presenting cells which link innate and adaptive immunity, through recognition and presentation of antigen to T cells. Although the importance of dendritic cells has been demonstrated in many animal models, their contribution to human immunity remains relatively unexplored in vivo. Given their central role in infection, autoimmunity, and malignancy, dendritic cell deficiency or dysfunction would be expected to have clinical consequences. Recent findings Human dendritic cell deficiency disorders, related to GATA binding protein 2 (GATA2) and interferon regulatory factor 8 (IRF8) mutations, have highlighted the importance of dendritic cells and monocytes in primary immunodeficiency diseases and begun to shed light on their nonredundant roles in host defense and immune regulation in vivo. The contribution of dendritic cell and monocyte dysfunction to the pathogenesis of primary immunodeficiency disease phenotypes is becoming increasingly apparent. However, dendritic cell analysis is not yet a routine part of primary immunodeficiency disease workup. Summary Widespread uptake of dendritic cell/monocyte screening in clinical practice will facilitate the discovery of novel dendritic cell and monocyte disorders as well as advancing our understanding of human dendritic cell biology in health and disease.
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17
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Huang W, Bei L, Hjort EE, Eklund EA. Decreased calpain activity in chronic myeloid leukemia impairs apoptosis by increasing survivin in myeloid progenitors and xiap1 in differentiating granulocytes. Oncotarget 2017; 8:50629-50641. [PMID: 28881589 PMCID: PMC5584179 DOI: 10.18632/oncotarget.16884] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 03/27/2017] [Indexed: 01/10/2023] Open
Abstract
Chronic Myeloid Leukemia (CML) is characterized by translocations between chromosomes 9 and 22, resulting in expression of Bcr-abl oncogenes. Although the clinical course of CML was revolutionized by development of Bcr-abl-directed tyrosine kinase inhibitors (TKIs), CML is not cured by these agents. Specifically, the majority of subjects relapsed in clinical trials attempting TKI discontinuation, suggesting persistence of leukemia stem cells (LSCs) even in molecular remission. Identifying mechanisms of CML-LSC persistence may suggest rationale therapeutic targets to augment TKI efficacy and lead to cure. Apoptosis resistance is one proposed mechanism. In prior studies, we identified increased expression of Growth Arrest Specific 2 (Gas2; a Calpain inhibitor) in Bcr-abl+ bone marrow progenitor cells. A number of previously described Calpain substrates might influence apoptosis in CML, including βcatenin and the X-linked Inhibitor of Apoptosis Protein 1 (Xiap1). We previously found Gas2/Calpain dependent stabilization of βcatenin in CML, and increased expression of βcatenin target genes, including Survivin (also an IAP). In the current work, we investigate contributions of Survivin and Xiap1 to Fas-resistance in Bcr-abl+ bone marrow cells. Inhibitors of these proteins are currently in clinical trials for other malignancies, but a role for either IAP in CML-LSC persistence is unknown.
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Affiliation(s)
- Weiqi Huang
- The Feinberg School at Northwestern University, Chicago, IL, USA.,Jesse Brown VA Medical Center, Chicago, IL, USA
| | - Ling Bei
- The Feinberg School at Northwestern University, Chicago, IL, USA.,Jesse Brown VA Medical Center, Chicago, IL, USA
| | - Elizabeth E Hjort
- The Feinberg School at Northwestern University, Chicago, IL, USA.,Jesse Brown VA Medical Center, Chicago, IL, USA
| | - Elizabeth A Eklund
- The Feinberg School at Northwestern University, Chicago, IL, USA.,Jesse Brown VA Medical Center, Chicago, IL, USA
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