1
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Chen X, Yan Y, Liu Z, Yang S, Li W, Wang Z, Wang M, Guo J, Li Z, Zhu W, Yang J, Yin J, Dai Q, Li Y, Wang C, Zhao L, Yang X, Guo X, Leng L, Xu J, Obukhov AG, Cao R, Zhong W. In vitro and in vivo inhibition of the host TRPC4 channel attenuates Zika virus infection. EMBO Mol Med 2024:10.1038/s44321-024-00103-4. [PMID: 39009885 DOI: 10.1038/s44321-024-00103-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 06/24/2024] [Accepted: 07/01/2024] [Indexed: 07/17/2024] Open
Abstract
Zika virus (ZIKV) infection may lead to severe neurological consequences, including seizures, and early infancy death. However, the involved mechanisms are still largely unknown. TRPC channels play an important role in regulating nervous system excitability and are implicated in seizure development. We investigated whether TRPCs might be involved in the pathogenesis of ZIKV infection. We found that ZIKV infection increases TRPC4 expression in host cells via the interaction between the ZIKV-NS3 protein and CaMKII, enhancing TRPC4-mediated calcium influx. Pharmacological inhibition of CaMKII decreased both pCREB and TRPC4 protein levels, whereas the suppression of either TRPC4 or CaMKII improved the survival rate of ZIKV-infected cells and reduced viral protein production, likely by impeding the replication phase of the viral life cycle. TRPC4 or CaMKII inhibitors also reduced seizures and increased the survival of ZIKV-infected neonatal mice and blocked the spread of ZIKV in brain organoids derived from human-induced pluripotent stem cells. These findings suggest that targeting CaMKII or TRPC4 may offer a promising approach for developing novel anti-ZIKV therapies, capable of preventing ZIKV-associated seizures and death.
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Affiliation(s)
- Xingjuan Chen
- Institute of Medical Research, Northwestern Polytechnical University, 710072, Xi'an, Shanxi, China
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Yunzheng Yan
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Zhiqiang Liu
- Beijing Institute of Basic Medical Sciences, Beijing, China
| | - Shaokang Yang
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Wei Li
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Zhuang Wang
- Institute of Medical Research, Northwestern Polytechnical University, 710072, Xi'an, Shanxi, China
| | - Mengyuan Wang
- Institute of Medical Research, Northwestern Polytechnical University, 710072, Xi'an, Shanxi, China
| | - Juan Guo
- Institute of Medical Research, Northwestern Polytechnical University, 710072, Xi'an, Shanxi, China
| | - Zhenyang Li
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Weiyan Zhu
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Jingjing Yang
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
- School of Pharmaceutical Sciences, Hainan University, Haikou, China
| | - Jiye Yin
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Qingsong Dai
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Yuexiang Li
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Cui Wang
- Beijing Institute of Basic Medical Sciences, Beijing, China
| | - Lei Zhao
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Xiaotong Yang
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Xiaojia Guo
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China
| | - Ling Leng
- State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jiaxi Xu
- Department of Physiology and Pathophysiology, Xi'an Jiaotong University Health Science Center, 710061, Xi'an, Shanxi, China
| | - Alexander G Obukhov
- The Department of Anatomy, Cell Biology & Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - Ruiyuan Cao
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China.
| | - Wu Zhong
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, China.
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2
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Ma Z, Song J, Hua Y, Wang Y, Cao W, Wang H, Hou L. The role of DDX46 in breast cancer proliferation and invasiveness: A potential therapeutic target. Cell Biol Int 2023; 47:283-291. [PMID: 36200534 DOI: 10.1002/cbin.11930] [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: 08/10/2022] [Revised: 09/14/2022] [Accepted: 09/24/2022] [Indexed: 01/19/2023]
Abstract
DDX46, a member of DEAD-box (DDX) proteins, is associated with various cancers, while its involvement in the pathogenesis of breast cancer hasn't been reported so far. The study demonstrated the overexpression of DDX46 in human breast cancer cells and tissue samples, and correlated with high histological grade and lymph node metastasis. Downregulation of DDX46 in the breast cancer cell lines inhibited their proliferation and invasiveness in vitro. Furthermore, the growth of MDA-MB-231 xenografts was suppressed in nude mice by DDX46 knockingdown. Taken together, our findings suggest that DDX46 is an oncogenic factor in human breast cancer, and a potential therapeutic target.
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Affiliation(s)
- Zhongliang Ma
- Department of Breast Center, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Jinlian Song
- Department of Laboratory, Qingdao University Affiliated Qingdao Women and Childrens Hospital, Qingdao, China
| | - Yanan Hua
- Chongqing Key Laboratory of Sichuan-Chongqing Co-construction for Diagnosis and Treatment of Infectious Diseases Integrated Traditional Chinese and Western Medicine, College of Medical Technology, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Yu Wang
- Department of Breast Center, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Weihong Cao
- Department of Breast Center, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Haibo Wang
- Department of Breast Center, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Lin Hou
- Department of Biochemistry and Molecular Biology, Qingdao University Medical College
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3
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Alonso A, Larraga J, Loayza FJ, Martínez E, Valladares B, Larraga V, Alcolea PJ. Stable Episomal Transfectant Leishmania infantum Promastigotes Over-Expressing the DEVH1 RNA Helicase Gene Down-Regulate Parasite Survival Genes. Pathogens 2022; 11:pathogens11070761. [PMID: 35890006 PMCID: PMC9323391 DOI: 10.3390/pathogens11070761] [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: 05/19/2022] [Revised: 06/10/2022] [Accepted: 06/20/2022] [Indexed: 12/10/2022] Open
Abstract
The compartmentalization of untranslated mRNA molecules in granules occurring in many eukaryotic organisms including trypanosomatids involves the formation of complexes between mRNA molecules and RNA-binding proteins (RBPs). The putative ATP-dependent DEAD/H RNA helicase (DEVH1) from Leishmania infantum (Kinetoplastida: Trypanosomatidae) is one such proteins. The objective of this research is finding differentially expressed genes in a stable episomal transfectant L. infantum promastigote line over-expressing DEVH1 in the stationary phase of growth in axenic culture to get insight into the biological roles of this RNA helicase in the parasite. Interestingly, genes related to parasite survival and virulence factors, such as the hydrophilic surface protein/small hydrophilic endoplasmic reticulum protein (HASP/SHERP) gene cluster, an amastin, and genes related to reactive oxygen species detoxification are down-regulated in DEVH1 transfectant promastigotes.
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Affiliation(s)
- Ana Alonso
- Laboratory of Molecular Parasitology and Vaccines, Biological, Immunological, and Chemical Drug Development for Global Health Unit (BICS), Department of Cellular and Molecular Biology, Center for Biological Research Margarita Salas, Spanish Research Council (CIBMS-CSIC), Calle Ramiro de Maeztu 9, 28040 Madrid, Spain; (A.A.); (J.L.); (F.J.L.); (V.L.)
| | - Jaime Larraga
- Laboratory of Molecular Parasitology and Vaccines, Biological, Immunological, and Chemical Drug Development for Global Health Unit (BICS), Department of Cellular and Molecular Biology, Center for Biological Research Margarita Salas, Spanish Research Council (CIBMS-CSIC), Calle Ramiro de Maeztu 9, 28040 Madrid, Spain; (A.A.); (J.L.); (F.J.L.); (V.L.)
| | - Francisco Javier Loayza
- Laboratory of Molecular Parasitology and Vaccines, Biological, Immunological, and Chemical Drug Development for Global Health Unit (BICS), Department of Cellular and Molecular Biology, Center for Biological Research Margarita Salas, Spanish Research Council (CIBMS-CSIC), Calle Ramiro de Maeztu 9, 28040 Madrid, Spain; (A.A.); (J.L.); (F.J.L.); (V.L.)
| | - Enrique Martínez
- Department of Obstetrics and Gynecology, Pediatrics, Preventive Medicine and Public Health, Toxicology, Legal and Forensic Medicine and Parasitology, Faculty of Pharmacy, University Institute of Public Health of the Canary Islands (IUETSPC), University of La Laguna (ULL), Avda, Astrofísico Francisco, Sánchez s/n, Campus de Anchieta, 38207 La Laguna, Spain; (E.M.); (B.V.)
| | - Basilio Valladares
- Department of Obstetrics and Gynecology, Pediatrics, Preventive Medicine and Public Health, Toxicology, Legal and Forensic Medicine and Parasitology, Faculty of Pharmacy, University Institute of Public Health of the Canary Islands (IUETSPC), University of La Laguna (ULL), Avda, Astrofísico Francisco, Sánchez s/n, Campus de Anchieta, 38207 La Laguna, Spain; (E.M.); (B.V.)
| | - Vicente Larraga
- Laboratory of Molecular Parasitology and Vaccines, Biological, Immunological, and Chemical Drug Development for Global Health Unit (BICS), Department of Cellular and Molecular Biology, Center for Biological Research Margarita Salas, Spanish Research Council (CIBMS-CSIC), Calle Ramiro de Maeztu 9, 28040 Madrid, Spain; (A.A.); (J.L.); (F.J.L.); (V.L.)
| | - Pedro José Alcolea
- Laboratory of Molecular Parasitology and Vaccines, Biological, Immunological, and Chemical Drug Development for Global Health Unit (BICS), Department of Cellular and Molecular Biology, Center for Biological Research Margarita Salas, Spanish Research Council (CIBMS-CSIC), Calle Ramiro de Maeztu 9, 28040 Madrid, Spain; (A.A.); (J.L.); (F.J.L.); (V.L.)
- Correspondence: ; Tel.: +34-9-1837-3112; Fax: +34-9-1536-0432
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Loh D, Reiter RJ. Melatonin: Regulation of Biomolecular Condensates in Neurodegenerative Disorders. Antioxidants (Basel) 2021; 10:1483. [PMID: 34573116 PMCID: PMC8465482 DOI: 10.3390/antiox10091483] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 09/10/2021] [Accepted: 09/13/2021] [Indexed: 12/12/2022] Open
Abstract
Biomolecular condensates are membraneless organelles (MLOs) that form dynamic, chemically distinct subcellular compartments organizing macromolecules such as proteins, RNA, and DNA in unicellular prokaryotic bacteria and complex eukaryotic cells. Separated from surrounding environments, MLOs in the nucleoplasm, cytoplasm, and mitochondria assemble by liquid-liquid phase separation (LLPS) into transient, non-static, liquid-like droplets that regulate essential molecular functions. LLPS is primarily controlled by post-translational modifications (PTMs) that fine-tune the balance between attractive and repulsive charge states and/or binding motifs of proteins. Aberrant phase separation due to dysregulated membrane lipid rafts and/or PTMs, as well as the absence of adequate hydrotropic small molecules such as ATP, or the presence of specific RNA proteins can cause pathological protein aggregation in neurodegenerative disorders. Melatonin may exert a dominant influence over phase separation in biomolecular condensates by optimizing membrane and MLO interdependent reactions through stabilizing lipid raft domains, reducing line tension, and maintaining negative membrane curvature and fluidity. As a potent antioxidant, melatonin protects cardiolipin and other membrane lipids from peroxidation cascades, supporting protein trafficking, signaling, ion channel activities, and ATPase functionality during condensate coacervation or dissolution. Melatonin may even control condensate LLPS through PTM and balance mRNA- and RNA-binding protein composition by regulating N6-methyladenosine (m6A) modifications. There is currently a lack of pharmaceuticals targeting neurodegenerative disorders via the regulation of phase separation. The potential of melatonin in the modulation of biomolecular condensate in the attenuation of aberrant condensate aggregation in neurodegenerative disorders is discussed in this review.
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Affiliation(s)
- Doris Loh
- Independent Researcher, Marble Falls, TX 78654, USA
| | - Russel J. Reiter
- Department of Cellular and Structural Biology, UT Health Science Center, San Antonio, TX 78229, USA
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5
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Membraneless organelles: phasing out of equilibrium. Emerg Top Life Sci 2021; 4:331-342. [PMID: 32744309 DOI: 10.1042/etls20190190] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 07/12/2020] [Accepted: 07/15/2020] [Indexed: 12/17/2022]
Abstract
Over the past years, liquid-liquid phase separation (LLPS) has emerged as a ubiquitous principle of cellular organization implicated in many biological processes ranging from gene expression to cell division. The formation of biological condensates, like the nucleolus or stress granules, by LLPS is at its core a thermodynamic equilibrium process. However, life does not operate at equilibrium, and cells have evolved multiple strategies to keep condensates in a non-equilibrium state. In this review, we discuss how these non-equilibrium drivers counteract solidification and potentially detrimental aggregation, and at the same time enable biological condensates to perform work and control the flux of substrates and information in a spatial and temporal manner.
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6
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Detanico T, Virgen-Slane R, Steen-Fuentes S, Lin WW, Rhode-Kurnow A, Chappell E, Correa RG, DiCandido MJ, Mbow ML, Li J, Ware CF. Co-expression Networks Identify DHX15 RNA Helicase as a B Cell Regulatory Factor. Front Immunol 2019; 10:2903. [PMID: 31921164 PMCID: PMC6915936 DOI: 10.3389/fimmu.2019.02903] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 11/26/2019] [Indexed: 12/30/2022] Open
Abstract
Genome-wide co-expression analysis is often used for annotating novel gene functions from high-dimensional data. Here, we developed an R package with a Shiny visualization app that creates immuno-networks from RNAseq data using a combination of Weighted Gene Co-expression Network Analysis (WGCNA), xCell immune cell signatures, and Bayesian Network Learning. Using a large publicly available RNAseq dataset we generated a Gene Module-Immune Cell (GMIC) network that predicted causal relationships between DEAH-box RNA helicase (DHX)15 and genes associated with humoral immunity, suggesting that DHX15 may regulate B cell fate. Deletion of DHX15 in mouse B cells led to impaired lymphocyte development, reduced peripheral B cell numbers, and dysregulated expression of genes linked to antibody-mediated immune responses similar to the genes predicted by the GMIC network. Moreover, antigen immunization of mice demonstrated that optimal primary IgG1 responses required DHX15. Intrinsic expression of DHX15 was necessary for proliferation and survival of activated of B cells. Altogether, these results support the use of co-expression networks to elucidate fundamental biological processes.
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Affiliation(s)
- Thiago Detanico
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
| | - Richard Virgen-Slane
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
| | - Seth Steen-Fuentes
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
| | - Wai W. Lin
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
| | - Antje Rhode-Kurnow
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
| | - Elizabeth Chappell
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
| | - Ricardo G. Correa
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
| | - Michael J. DiCandido
- Department of Immunology & Respiratory Disease Research, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, CT, United States
| | - M. Lamine Mbow
- Department of Immunology & Respiratory Disease Research, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, CT, United States
| | - Jun Li
- Department of Immunology & Respiratory Disease Research, Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, CT, United States
| | - Carl F. Ware
- Infectious and Inflammatory Disease Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, United States
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7
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Stroberg W, Schnell S. On the origin of non-membrane-bound organelles, and their physiological function. J Theor Biol 2017; 434:42-49. [PMID: 28392184 DOI: 10.1016/j.jtbi.2017.04.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Revised: 03/29/2017] [Accepted: 04/05/2017] [Indexed: 12/28/2022]
Abstract
The origin of cellular compartmentalization has long been viewed as paralleling the origin of life. Historically, membrane-bound organelles have been presented as the canonical examples of compartmentalization. However, recent interest in cellular compartments that lack encompassing membranes has forced biologists to reexamine the form and function of cellular organization. The intracellular environment is now known to be full of transient macromolecular structures that are essential to cellular function, especially in relation to RNA regulation. Here we discuss key findings regarding the physicochemical principles governing the formation and function of non-membrane-bound organelles. Particularly, we focus how the physiological function of non-membrane-bound organelles depends on their molecular structure. We also present a potential mechanism for the formation of non-membrane-bound organelles. We conclude with suggestions for future inquiry into the diversity of roles played by non-membrane bound organelles.
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Affiliation(s)
- Wylie Stroberg
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
| | - Santiago Schnell
- Department of Molecular & Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109, USA; Department of Computational Medicine & Bioinformatics, University of Michigan Medical School, Ann Arbor, MI 48109, USA; Brehm Center for Diabetes Research, University of Michigan Medical School, Ann Arbor, MI 48105, USA.
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8
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The multiple functions of RNA helicases as drivers and regulators of gene expression. Nat Rev Mol Cell Biol 2016; 17:426-38. [PMID: 27251421 DOI: 10.1038/nrm.2016.50] [Citation(s) in RCA: 178] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
RNA helicases comprise the largest family of enzymes involved in the metabolism of mRNAs, the processing and fate of which rely on their packaging into messenger ribonucleoprotein particles (mRNPs). In this Review, we describe how the capacity of some RNA helicases to either remodel or lock the composition of mRNP complexes underlies their pleiotropic functions at different steps of the gene expression process. We illustrate the roles of RNA helicases in coordinating gene expression steps and programmes, and propose that RNA helicases function as molecular drivers and guides of the progression of their mRNA substrates from one RNA-processing factory to another, to a productive mRNA pool that leads to protein synthesis or to unproductive mRNA pools that are stored or degraded.
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9
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Brenner AK, Reikvam H, Bruserud Ø. A Subset of Patients with Acute Myeloid Leukemia Has Leukemia Cells Characterized by Chemokine Responsiveness and Altered Expression of Transcriptional as well as Angiogenic Regulators. Front Immunol 2016; 7:205. [PMID: 27252705 PMCID: PMC4879142 DOI: 10.3389/fimmu.2016.00205] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 05/11/2016] [Indexed: 12/29/2022] Open
Abstract
Acute myeloid leukemia (AML) is an aggressive and heterogeneous bone marrow malignancy, the only curative treatment being intensive chemotherapy eventually in combination with allogeneic stem cell transplantation. Both the AML and their neighboring stromal cells show constitutive chemokine release, but chemokines seem to function as regulators of AML cell proliferation only for a subset of patients. Chemokine targeting is therefore considered not only for immunosuppression in allotransplanted patients but also as a possible antileukemic strategy in combination with intensive chemotherapy or as part of disease-stabilizing treatment at least for the subset of patients with chemokine-responsive AML cells. In this study, we characterized more in detail the leukemia cell phenotype of the chemokine-responsive patients. We investigated primary AML cells derived from 79 unselected patients. Standardized in vitro suspension cultures were used to investigate AML cell proliferation, and global gene expression profiles were compared for chemokine responders and non-responders identified through the proliferation assays. CCL28-induced growth modulation was used as marker of chemokine responsiveness, and 38 patients were then classified as chemokine-responsive. The effects of exogenous CCL28 (growth inhibition/enhancement/no effect) thus differed among patients and was also dependent on the presence of exogenous hematopoietic growth factors as well as constitutive AML cell cytokine release. The effect of CCR1 inhibition in the presence of chemokine-secreting mesenchymal stem cells also differed among patients. Chemokine-responsive AML cells showed altered expression of genes important for (i) epigenetic transcriptional regulation, particularly lysine acetylation; (ii) helicase activity, especially DExD/H RNA helicases; and (iii) angioregulatory proteins important for integrin binding. Thus, chemokine responsiveness is part of a complex AML cell phenotype with regard to extracellular communication and transcriptional regulation. Chemokine targeting in chemokine-responsive patients may thereby alter AML cell trafficking and increase their susceptibility toward antileukemic treatment, e.g., conventional chemotherapy or targeting of other phenotypic characteristics of the chemokine-responsive cells.
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Affiliation(s)
- Annette K Brenner
- Section for Hematology, Department of Clinical Science, University of Bergen , Bergen , Norway
| | - Håkon Reikvam
- Department of Medicine, Haukeland University Hospital , Bergen , Norway
| | - Øystein Bruserud
- Section for Hematology, Department of Clinical Science, University of Bergen, Bergen, Norway; Department of Medicine, Haukeland University Hospital, Bergen, Norway
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10
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Afonso-Lehmann RN, Thomas MC, Santana-Morales MA, Déniz D, López MC, Valladares B, Martínez-Carretero E. A DEVH-box RNA Helicase from Leishmania braziliensis is Associated to mRNA Cytoplasmic Granules. Protist 2015; 166:457-67. [PMID: 26284493 DOI: 10.1016/j.protis.2015.07.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 07/01/2015] [Accepted: 07/06/2015] [Indexed: 11/25/2022]
Abstract
RNA helicases are ubiquitous enzymes that participate in almost all aspects of RNA processing, including RNA and RNA-protein complex remodelling. In trypanosomatids, which post-transcriptionally regulate gene expression, the formation of different kinds of ribonucleoprotein granules under stress conditions modulates the parasite's RNA metabolism. This paper describes the isolation of a putative DEVH-box RNA helicase produced by promastigotes of Leishmania braziliensis. Using a Cy3-labelled dT30 oligo, FISH showed the localization of this protein to mRNA granules under starvation stress conditions. The central region of the protein was shown to be responsible for this behaviour.
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Affiliation(s)
- Raquel N Afonso-Lehmann
- Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Universidad de La Laguna, Avda. Astrofisico Fco. Sánchez s/n, 38207 Tenerife, Spain; Departamento de Biología Molecular, Instituto de Parasitología y Biomedicina López Neyra-CSIC, Parque Tecnológico de Ciencias de la Salud, 18016 Granada, Spain
| | - Maria C Thomas
- Departamento de Biología Molecular, Instituto de Parasitología y Biomedicina López Neyra-CSIC, Parque Tecnológico de Ciencias de la Salud, 18016 Granada, Spain
| | - Maria A Santana-Morales
- Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Universidad de La Laguna, Avda. Astrofisico Fco. Sánchez s/n, 38207 Tenerife, Spain
| | - Daniel Déniz
- Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Universidad de La Laguna, Avda. Astrofisico Fco. Sánchez s/n, 38207 Tenerife, Spain
| | - Manuel C López
- Departamento de Biología Molecular, Instituto de Parasitología y Biomedicina López Neyra-CSIC, Parque Tecnológico de Ciencias de la Salud, 18016 Granada, Spain
| | - Basilio Valladares
- Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Universidad de La Laguna, Avda. Astrofisico Fco. Sánchez s/n, 38207 Tenerife, Spain
| | - Enrique Martínez-Carretero
- Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias, Universidad de La Laguna, Avda. Astrofisico Fco. Sánchez s/n, 38207 Tenerife, Spain.
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11
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Crater AK, Manni E, Ananvoranich S. Utilization of inherent miRNAs in functional analyses of Toxoplasma gondii genes. J Microbiol Methods 2015; 108:92-102. [DOI: 10.1016/j.mimet.2014.11.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 11/26/2014] [Accepted: 11/26/2014] [Indexed: 10/24/2022]
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12
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Holmes M, Itaas V, Ananvoranich S. Sustained translational repression of lactate dehydrogenase 1 inToxoplasma gondiibradyzoites is conferred by a small regulatory RNA hairpin. FEBS J 2014; 281:5077-91. [DOI: 10.1111/febs.13048] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 09/04/2014] [Accepted: 09/09/2014] [Indexed: 12/24/2022]
Affiliation(s)
- Michael Holmes
- Department of Chemistry and Biochemistry; University of Windsor; Canada
| | - Vaunell Itaas
- Department of Chemistry and Biochemistry; University of Windsor; Canada
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13
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Cherry AA, Ananvoranich S. Characterization of a homolog of DEAD-box RNA helicases in Toxoplasma gondii as a marker of cytoplasmic mRNP stress granules. Gene 2014; 543:34-44. [PMID: 24709106 DOI: 10.1016/j.gene.2014.04.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 03/23/2014] [Accepted: 04/03/2014] [Indexed: 11/27/2022]
Abstract
Toxoplasma gondii is an obligate intracellular protozoan which infects one-third of the human population. Due to its high infection prevalence, Toxoplasma offers an ideal system for the study of host-parasite interaction. Similar to other eukaryotes, Toxoplasma maintains levels and localization of cytoplasmic mRNAs throughout its life cycle as part of a gene regulation network to meet all cellular and biochemical requirements. More recently, it was reported that the presence of cytoplasmic mRNA granules could contribute to the parasite pathogenesis and viability. Here we identified a novel Toxoplasma DEAD-box RNA helicase, referred to as Toxoplasma gondiiHomolog of DOZI (TgHoDI), because of its high homology (81%) to Plasmodium DOZI. TgHoDI is the functional ortholog of yeast DHH1, and its function was authenticated by complementation studies in Δdhh1 yeast strain. We demonstrated that TgHoDI is a marker of cytoplasmic RNA stress granules, which assemble when the parasites experience cellular stresses and translational arrest.
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Affiliation(s)
- Ahmed Adnan Cherry
- The Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B3P4, Canada
| | - Sirinart Ananvoranich
- The Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B3P4, Canada.
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