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Wang J, Erlacher M, Fernandez-Orth J. The role of inflammation in hematopoiesis and bone marrow failure: What can we learn from mouse models? Front Immunol 2022; 13:951937. [PMID: 36032161 PMCID: PMC9403273 DOI: 10.3389/fimmu.2022.951937] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 07/25/2022] [Indexed: 11/17/2022] Open
Abstract
Hematopoiesis is a remarkable system that plays an important role in not only immune cell function, but also in nutrient transport, hemostasis and wound healing among other functions. Under inflammatory conditions, steady-state hematopoiesis switches to emergency myelopoiesis to give rise to the effector cell types necessary to fight the acute insult. Sustained or aberrant exposure to inflammatory signals has detrimental effects on the hematopoietic system, leading to increased proliferation, DNA damage, different forms of cell death (i.e., apoptosis, pyroptosis and necroptosis) and bone marrow microenvironment modifications. Together, all these changes can cause premature loss of hematopoiesis function. Especially in individuals with inherited bone marrow failure syndromes or immune-mediated aplastic anemia, chronic inflammatory signals may thus aggravate cytopenias and accelerate disease progression. However, the understanding of the inflammation roles in bone marrow failure remains limited. In this review, we summarize the different mechanisms found in mouse models regarding to inflammatory bone marrow failure and discuss implications for future research and clinical practice.
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Affiliation(s)
- Jun Wang
- Division of Pediatric Hematology and Oncology, Department of Pediatrics and Adolescent Medicine, Faculty of Medicine, University Medical Center Freiburg, University of Freiburg, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Miriam Erlacher
- Division of Pediatric Hematology and Oncology, Department of Pediatrics and Adolescent Medicine, Faculty of Medicine, University Medical Center Freiburg, University of Freiburg, Freiburg, Germany
| | - Juncal Fernandez-Orth
- Division of Pediatric Hematology and Oncology, Department of Pediatrics and Adolescent Medicine, Faculty of Medicine, University Medical Center Freiburg, University of Freiburg, Freiburg, Germany
- *Correspondence: Juncal Fernandez-Orth,
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2
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Yigit BI, Fernandez-Orth J, Weiss JM, Molnar C, Andrieux G, Gonzalez-Mendez I, Börries M, Niemeyer CM, Teichert-von Lüttichau I, Erlacher M. Identification of functional defects promoting leukemogenesis in
GATA2-deficient individuals. KLINISCHE PADIATRIE 2022. [DOI: 10.1055/s-0042-1748716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- BI Yigit
- University Medical Center Freiburg, Center for Pediatrics, Department
of Pediatric Hematology and Oncology, Freiburg, Germany
- Kinderklinik Muenchen Schwabing, Department of Pediatrics and
Children's Cancer Research Center, TUM School of Medicine, Technical
University of Munich, Munich, Germany
| | - J Fernandez-Orth
- University Medical Center Freiburg, Center for Pediatrics, Department
of Pediatric Hematology and Oncology, Freiburg, Germany
| | - JM Weiss
- University Medical Center Freiburg, Center for Pediatrics, Department
of Pediatric Hematology and Oncology, Freiburg, Germany
| | - C Molnar
- University Medical Center Freiburg, Center for Pediatrics, Department
of Pediatric Hematology and Oncology, Freiburg, Germany
| | - G Andrieux
- University Medical Center Freiburg, Institute of Medical Bioinformatics
und Systems Medicine IBSM, Freiburg, Germany
| | - I Gonzalez-Mendez
- University of Tübingen, Institute of Pathology and
Neuropathology, Tübingen, Germany
| | - M Börries
- University Medical Center Freiburg, Institute of Medical Bioinformatics
und Systems Medicine IBSM, Freiburg, Germany
| | - CM Niemeyer
- University Medical Center Freiburg, Center for Pediatrics, Department
of Pediatric Hematology and Oncology, Freiburg, Germany
| | - I Teichert-von Lüttichau
- Kinderklinik Muenchen Schwabing, Department of Pediatrics and
Children's Cancer Research Center, TUM School of Medicine, Technical
University of Munich, Munich, Germany
| | - M Erlacher
- University Medical Center Freiburg, Center for Pediatrics, Department
of Pediatric Hematology and Oncology, Freiburg, Germany
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3
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Hagenbourger F, Fernandez-Orth J, Bohler S, Weiss JM, Andrieux G, Börries M, Niemeyer CM, Erlacher M. Characterization of cooperating mechanisms in GATA2
syndrome. KLINISCHE PADIATRIE 2022. [DOI: 10.1055/s-0042-1748717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- F Hagenbourger
- University Medical Center Freiburg, Center for Pediatrics and
Adolescent Medicine, Department of Pediatric Hematology and Oncology, Freiburg,
Germany
- MOTI-VATE Graduate School, Faculty of Medicine, University of Freiburg,
Freiburg, Germany
| | - J Fernandez-Orth
- University Medical Center Freiburg, Center for Pediatrics and
Adolescent Medicine, Department of Pediatric Hematology and Oncology, Freiburg,
Germany
| | - S Bohler
- University Medical Center Freiburg, Center for Pediatrics and
Adolescent Medicine, Department of Pediatric Hematology and Oncology, Freiburg,
Germany
| | - JM Weiss
- University Medical Center Freiburg, Center for Pediatrics and
Adolescent Medicine, Department of Pediatric Hematology and Oncology, Freiburg,
Germany
| | - G Andrieux
- University Medical Center Freiburg, Institute of Medical Bioinformatics
und Systems Medicine IBSM, Freiburg, Germany
| | - M Börries
- University Medical Center Freiburg, Institute of Medical Bioinformatics
und Systems Medicine IBSM, Freiburg, Germany
| | - CM Niemeyer
- University Medical Center Freiburg, Center for Pediatrics and
Adolescent Medicine, Department of Pediatric Hematology and Oncology, Freiburg,
Germany
| | - M Erlacher
- University Medical Center Freiburg, Center for Pediatrics and
Adolescent Medicine, Department of Pediatric Hematology and Oncology, Freiburg,
Germany
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4
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Bohler S, Afreen S, Fernandez-Orth J, Demmerath EM, Molnar C, Wu Y, Weiss JM, Mittapalli VR, Konstantinidis L, Schmal H, Kunze M, Erlacher M. Inhibition of the anti-apoptotic protein MCL-1 severely suppresses human hematopoiesis. Haematologica 2020; 106:3136-3148. [PMID: 33241675 PMCID: PMC8634190 DOI: 10.3324/haematol.2020.252130] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Indexed: 11/16/2022] Open
Abstract
BH3-mimetics inhibiting anti-apoptotic BCL-2 proteins represent a novel and promising class of antitumor drugs. While the BCL-2 inhibitor venetoclax is already approved by the Food and Drug Administration, BCL-XL and MCL-1 inhibitors are currently in early clinical trials. To predict side effects of therapeutic MCL-1 inhibition on the human hematopoietic system, we used RNA interference and the small molecule inhibitor S63845 on cord blood-derived CD34+ cells. Both approaches resulted in almost complete depletion of human hematopoietic stem and progenitor cells. As a consequence, maturation into the different hematopoietic lineages was severely restricted and CD34+ cells expressing MCL-1 shRNA showed a very limited engraftment potential upon xenotransplantation. In contrast, mature blood cells survived normally in the absence of MCL-1. Combined inhibition of MCL-1 and BCL-XL resulted in synergistic effects with relevant loss of colony-forming hematopoietic stem and progenitor cells already at inhibitor concentrations of 0.1 mM each, indicating “synthetic lethality” of the two BH3- mimetics in the hematopoietic system.
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Affiliation(s)
- Sheila Bohler
- Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg, Germany; Faculty of Biology, University of Freiburg
| | - Sehar Afreen
- Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg
| | - Juncal Fernandez-Orth
- Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg
| | - Eva-Maria Demmerath
- Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg
| | - Christian Molnar
- Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg, Germany; Faculty of Biology, University of Freiburg, Germany; Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg
| | - Ying Wu
- Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg, Germany; Faculty of Biology, University of Freiburg
| | - Julia Miriam Weiss
- Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg
| | - Venugopal Rao Mittapalli
- Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg
| | - Lukas Konstantinidis
- Department of Orthopedics and Trauma Surgery, Medical Center, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg
| | - Hagen Schmal
- Department of Orthopedics and Trauma Surgery, Medical Center, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Freiburg
| | - Mirjam Kunze
- Department of Obstetrics and Gynecology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg
| | - Miriam Erlacher
- Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg, Germany; German Cancer Consortium (DKTK), Freiburg, Germany and German Cancer Research Center (DKFZ), Heidelberg
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5
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Hundehege P, Cerina M, Eichler S, Thomas C, Herrmann AM, Göbel K, Müntefering T, Fernandez-Orth J, Bock S, Narayanan V, Budde T, Speckmann EJ, Wiendl H, Schubart A, Ruck T, Meuth SG. The next-generation sphingosine-1 receptor modulator BAF312 (siponimod) improves cortical network functionality in focal autoimmune encephalomyelitis. Neural Regen Res 2019; 14:1950-1960. [PMID: 31290453 PMCID: PMC6676873 DOI: 10.4103/1673-5374.259622] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Autoimmune diseases of the central nervous system (CNS) like multiple sclerosis (MS) are characterized by inflammation and demyelinated lesions in white and grey matter regions. While inflammation is present at all stages of MS, it is more pronounced in the relapsing forms of the disease, whereas progressive MS (PMS) shows significant neuroaxonal damage and grey and white matter atrophy. Hence, disease-modifying treatments beneficial in patients with relapsing MS have limited success in PMS. BAF312 (siponimod) is a novel sphingosine-1-phosphate receptor modulator shown to delay progression in PMS. Besides reducing inflammation by sequestering lymphocytes in lymphoid tissues, BAF312 crosses the blood-brain barrier and binds its receptors on neurons, astrocytes and oligodendrocytes. To evaluate potential direct neuroprotective effects, BAF312 was systemically or locally administered in the CNS of experimental autoimmune encephalomyelitis mice with distinct grey- and white-matter lesions (focal experimental autoimmune encephalomyelitis using an osmotic mini-pump). Ex-vivo flow cytometry revealed that systemic but not local BAF312 administration lowered immune cell infiltration in animals with both grey and white matter lesions. Ex-vivo voltage-sensitive dye imaging of acute brain slices revealed an altered spatio-temporal pattern of activation in the lesioned cortex compared to controls in response to electrical stimulation of incoming white-matter fiber tracts. Here, BAF312 administration showed partial restore of cortical neuronal circuit function. The data suggest that BAF312 exerts a neuroprotective effect after crossing the blood-brain barrier independently of peripheral effects on immune cells. Experiments were carried out in accordance with German and EU animal protection law and approved by local authorities (Landesamt für Natur, Umwelt und Verbraucherschutz Nordrhein-Westfalen; 87-51.04.2010.A331) on December 28, 2010.
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Affiliation(s)
- Petra Hundehege
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Manuela Cerina
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Susann Eichler
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Christian Thomas
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Alexander M Herrmann
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Kerstin Göbel
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Thomas Müntefering
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Juncal Fernandez-Orth
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Stefanie Bock
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Venu Narayanan
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-Universität, Münster, Germany
| | | | - Heinz Wiendl
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Anna Schubart
- Novartis Institutes of Biomedical Research, Basel, Switzerland
| | - Tobias Ruck
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Sven G Meuth
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
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6
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Hundehege P, Fernandez-Orth J, Römer P, Ruck T, Müntefering T, Eichler S, Cerina M, Epping L, Albrecht S, Menke AF, Birkner K, Göbel K, Budde T, Zipp F, Wiendl H, Gorji A, Bittner S, Meuth SG. Targeting Voltage-Dependent Calcium Channels with Pregabalin Exerts a Direct Neuroprotective Effect in an Animal Model of Multiple Sclerosis. Neurosignals 2018; 26:77-93. [PMID: 30481775 DOI: 10.1159/000495425] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 11/08/2018] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Multiple sclerosis (MS) is a prototypical autoimmune central nervous system (CNS) disease. Particularly progressive forms of MS (PMS) show significant neuroaxonal damage as consequence of demyelination and neuronal hyperexcitation. Immuno-modulatory treatment strategies are beneficial in relapsing MS (RMS), but mostly fail in PMS. Pregabalin (Lyrica®) is prescribed to MS patients to treat neuropathic pain. Mechanistically, it targets voltage-dependent Ca2+ channels and reduces harmful neuronal hyperexcitation in mouse epilepsy models. Studies suggest that GABA analogues like pregabalin exert neuroprotective effects in animal models of ischemia and trauma. METHODS We tested the impact of pregabalin in a mouse model of MS (experimental autoimmune encephalomyelitis, EAE) and performed histological and immunological evaluations as well as intravital two-photon-microscopy of brainstem EAE lesions. RESULTS Both prophylactic and therapeutic treatments ameliorated the clinical symptoms of EAE and reduced immune cell infiltration into the CNS. On neuronal level, pregabalin reduced long-term potentiation in hippocampal brain slices indicating an impact on mechanisms of learning and memory. In contrast, T cells, microglia and brain endothelial cells were unaffected by pregabalin. However, we found a direct impact of pregabalin on neurons during CNS inflammation as it reversed the pathological elevation of neuronal intracellular Ca2+ levels in EAE lesions. CONCLUSION The presented data suggest that pregabalin primarily acts on neuronal Ca2+ channel trafficking thereby reducing Ca2+-mediated cytotoxicity and neuronal damage in an animal model of MS. Future clinical trials need to assess the benefit for neuronal survival by expanding the indication for pregabalin administration to MS patients in further disease phases.
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Affiliation(s)
- Petra Hundehege
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany,
| | - Juncal Fernandez-Orth
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Pia Römer
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Tobias Ruck
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Thomas Müntefering
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Susann Eichler
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Manuela Cerina
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Lisa Epping
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Sarah Albrecht
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Amélie F Menke
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Katharina Birkner
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Kerstin Göbel
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, University of Münster, Münster, Germany
| | - Frauke Zipp
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Heinz Wiendl
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Ali Gorji
- Neurology Department with Institute of Translational Neurology and Neurosurgery Department, University of Münster, Münster, Germany
| | - Stefan Bittner
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Sven G Meuth
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
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7
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Hucke S, Herold M, Liebmann M, Freise N, Lindner M, Fleck AK, Zenker S, Thiebes S, Fernandez-Orth J, Buck D, Luessi F, Meuth SG, Zipp F, Hemmer B, Engel DR, Roth J, Kuhlmann T, Wiendl H, Klotz L. The farnesoid-X-receptor in myeloid cells controls CNS autoimmunity in an IL-10-dependent fashion. Acta Neuropathol 2016; 132:413-31. [PMID: 27383204 DOI: 10.1007/s00401-016-1593-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Revised: 06/09/2016] [Accepted: 06/26/2016] [Indexed: 12/24/2022]
Abstract
Innate immune responses by myeloid cells decisively contribute to perpetuation of central nervous system (CNS) autoimmunity and their pharmacologic modulation represents a promising strategy to prevent disease progression in Multiple Sclerosis (MS). Based on our observation that peripheral immune cells from relapsing-remitting and primary progressive MS patients exhibited strongly decreased levels of the bile acid receptor FXR (farnesoid-X-receptor, NR1H4), we evaluated its potential relevance as therapeutic target for control of established CNS autoimmunity. Pharmacological FXR activation promoted generation of anti-inflammatory macrophages characterized by arginase-1, increased IL-10 production, and suppression of T cell responses. In mice, FXR activation ameliorated CNS autoimmunity in an IL-10-dependent fashion and even suppressed advanced clinical disease upon therapeutic administration. In analogy to rodents, pharmacological FXR activation in human monocytes from healthy controls and MS patients induced an anti-inflammatory phenotype with suppressive properties including control of effector T cell proliferation. We therefore, propose an important role of FXR in control of T cell-mediated autoimmunity by promoting anti-inflammatory macrophage responses.
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Affiliation(s)
- Stephanie Hucke
- Department of Neurology, University of Muenster, Albert-Schweitzer-Campus 1, Building A1, 48149, Muenster, Germany
| | - Martin Herold
- Department of Neurology, University of Muenster, Albert-Schweitzer-Campus 1, Building A1, 48149, Muenster, Germany
| | - Marie Liebmann
- Institute of Immunology, University of Muenster, Muenster, Germany
| | - Nicole Freise
- Institute of Immunology, University of Muenster, Muenster, Germany
| | - Maren Lindner
- Department of Neurology, University of Muenster, Albert-Schweitzer-Campus 1, Building A1, 48149, Muenster, Germany
| | - Ann-Katrin Fleck
- Department of Neurology, University of Muenster, Albert-Schweitzer-Campus 1, Building A1, 48149, Muenster, Germany
| | - Stefanie Zenker
- Institute of Immunology, University of Muenster, Muenster, Germany
| | - Stephanie Thiebes
- Institute of Experimental Immunology and Imaging, University Duisburg-Essen, Essen, Germany
| | - Juncal Fernandez-Orth
- Department of Neurology, University of Muenster, Albert-Schweitzer-Campus 1, Building A1, 48149, Muenster, Germany
| | - Dorothea Buck
- Department of Neurology, Technische Universität München, Munich, Germany
| | - Felix Luessi
- Department of Neurology, University of Mainz, Mainz, Germany
| | - Sven G Meuth
- Department of Neurology, University of Muenster, Albert-Schweitzer-Campus 1, Building A1, 48149, Muenster, Germany
- Cluster of Excellence Cells in Motion, University of Muenster, Muenster, Germany
| | - Frauke Zipp
- Department of Neurology, University of Mainz, Mainz, Germany
| | - Bernhard Hemmer
- Department of Neurology, Technische Universität München, Munich, Germany
- Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Daniel Robert Engel
- Institute of Experimental Immunology and Imaging, University Duisburg-Essen, Essen, Germany
| | - Johannes Roth
- Institute of Immunology, University of Muenster, Muenster, Germany
| | - Tanja Kuhlmann
- Institute of Neuropathology, University of Muenster, Muenster, Germany
| | - Heinz Wiendl
- Department of Neurology, University of Muenster, Albert-Schweitzer-Campus 1, Building A1, 48149, Muenster, Germany
- Cluster of Excellence Cells in Motion, University of Muenster, Muenster, Germany
| | - Luisa Klotz
- Department of Neurology, University of Muenster, Albert-Schweitzer-Campus 1, Building A1, 48149, Muenster, Germany.
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8
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Wemhöner K, Kanyshkova T, Silbernagel N, Fernandez-Orth J, Bittner S, Kiper AK, Rinné S, Netter MF, Meuth SG, Budde T, Decher N. An N-terminal deletion variant of HCN1 in the epileptic WAG/Rij strain modulates HCN current densities. Front Mol Neurosci 2015; 8:63. [PMID: 26578877 PMCID: PMC4630678 DOI: 10.3389/fnmol.2015.00063] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 10/13/2015] [Indexed: 11/26/2022] Open
Abstract
Rats of the Wistar Albino Glaxo/Rij (WAG/Rij) strain show symptoms resembling human absence epilepsy. Thalamocortical neurons of WAG/Rij rats are characterized by an increased HCN1 expression, a negative shift in Ih activation curve, and an altered responsiveness of Ih to cAMP. We cloned HCN1 channels from rat thalamic cDNA libraries of the WAG/Rij strain and found an N-terminal deletion of 37 amino acids. In addition, WAG-HCN1 has a stretch of six amino acids, directly following the deletion, where the wild-type sequence (GNSVCF) is changed to a polyserine motif. These alterations were found solely in thalamus mRNA but not in genomic DNA. The truncated WAG-HCN1 was detected late postnatal in WAG/Rij rats and was not passed on to rats obtained from pairing WAG/Rij and non-epileptic August Copenhagen Irish rats. Heterologous expression in Xenopus oocytes revealed 2.2-fold increased current amplitude of WAG-HCN1 compared to rat HCN1. While WAG-HCN1 channels did not have altered current kinetics or changed regulation by protein kinases, fluorescence imaging revealed a faster and more pronounced surface expression of WAG-HCN1. Using co-expression experiments, we found that WAG-HCN1 channels suppress heteromeric HCN2 and HCN4 currents. Moreover, heteromeric channels of WAG-HCN1 with HCN2 have a reduced cAMP sensitivity. Functional studies revealed that the gain-of-function of WAG-HCN1 is not caused by the N-terminal deletion alone, thus requiring a change of the N-terminal GNSVCF motif. Our findings may help to explain previous observations in neurons of the WAG/Rij strain and indicate that WAG-HCN1 may contribute to the genesis of absence seizures in WAG/Rij rats.
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Affiliation(s)
- Konstantin Wemhöner
- Institute for Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg Marburg, Germany
| | - Tatyana Kanyshkova
- Institute for Physiology I, Westfälische Wilhelms-Universität Münster, Germany
| | - Nicole Silbernagel
- Institute for Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg Marburg, Germany
| | | | - Stefan Bittner
- Department of Neurology, University Medical Center, Johannes Gutenberg-University Mainz Mainz, Germany
| | - Aytug K Kiper
- Institute for Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg Marburg, Germany
| | - Susanne Rinné
- Institute for Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg Marburg, Germany
| | - Michael F Netter
- Institute for Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg Marburg, Germany
| | - Sven G Meuth
- Department of Neurology, Westfälische Wilhelms-Universität Münster, Germany
| | - Thomas Budde
- Institute for Physiology I, Westfälische Wilhelms-Universität Münster, Germany
| | - Niels Decher
- Institute for Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg Marburg, Germany
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9
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Gomis-Perez C, Alaimo A, Fernandez-Orth J, Alberdi A, Aivar-Mateo P, Bernardo-Seisdedos G, Malo C, Areso P, Felipe A, Villarroel A. An unconventional calmodulin-anchoring site within the AB module of Kv7.2 channels. J Cell Sci 2015; 128:3155-63. [PMID: 26148514 DOI: 10.1242/jcs.174128] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 06/23/2015] [Indexed: 11/20/2022] Open
Abstract
Calmodulin (CaM) binding to the AB module is crucial for multiple mechanisms governing the function of Kv7.2 (also known as KCNQ2) K(+) channel subunits, which mediate one of the main components of the non-inactivating K(+) M-current, a key controller of neuronal excitability. Structural analysis indicates that the CaM N-lobe engages with helix B, whereas the C-lobe anchors to the IQ site within helix A. Here, we report the identification of a new site between helices A and B that assists in CaM binding whose sequence is reminiscent of the TW helix within the CaM C-lobe anchoring site of SK2 K(+) channels (also known as KCNN2). Mutations that disrupt CaM binding within the TW site, helix B or helix A yield functional channels, whereas no function is observed when the TW site and helix A, or the TW site and helix B are mutated simultaneously. Our data indicate that the TW site is dispensable for function, contributes to the stabilization of the CaM-Kv7.2 complex and becomes essential when docking to either helix A or when helix B is perturbed.
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Affiliation(s)
- Carolina Gomis-Perez
- Unidad de Biofísica, Consejo Superior de Investigaciones Científicas, CSIC, UPV/EHU, Universidad del País Vasco, Barrio Sarriena s/n, Leioa 48940, Spain
| | - Alessandro Alaimo
- Unidad de Biofísica, Consejo Superior de Investigaciones Científicas, CSIC, UPV/EHU, Universidad del País Vasco, Barrio Sarriena s/n, Leioa 48940, Spain
| | - Juncal Fernandez-Orth
- Unidad de Biofísica, Consejo Superior de Investigaciones Científicas, CSIC, UPV/EHU, Universidad del País Vasco, Barrio Sarriena s/n, Leioa 48940, Spain
| | - Araitz Alberdi
- Unidad de Biofísica, Consejo Superior de Investigaciones Científicas, CSIC, UPV/EHU, Universidad del País Vasco, Barrio Sarriena s/n, Leioa 48940, Spain
| | - Paloma Aivar-Mateo
- Unidad de Biofísica, Consejo Superior de Investigaciones Científicas, CSIC, UPV/EHU, Universidad del País Vasco, Barrio Sarriena s/n, Leioa 48940, Spain
| | - Ganeko Bernardo-Seisdedos
- Unidad de Biofísica, Consejo Superior de Investigaciones Científicas, CSIC, UPV/EHU, Universidad del País Vasco, Barrio Sarriena s/n, Leioa 48940, Spain
| | - Covadonga Malo
- Unidad de Biofísica, Consejo Superior de Investigaciones Científicas, CSIC, UPV/EHU, Universidad del País Vasco, Barrio Sarriena s/n, Leioa 48940, Spain
| | - Pilar Areso
- Dept. Farmacología, UPV/EHU, Universidad del País Vasco, Barrio Sarriena s/n, Leioa 48940, Spain
| | - Antonio Felipe
- Molecular Physiology Laboratory, Departament de Bioquímica i Biologia Molecular, Institut de Biomedicina (IBUB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Alvaro Villarroel
- Unidad de Biofísica, Consejo Superior de Investigaciones Científicas, CSIC, UPV/EHU, Universidad del País Vasco, Barrio Sarriena s/n, Leioa 48940, Spain
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Padilla-Parra S, las Heras GD, Fernandez-Orth J, Lopez-Fernandez S, Villarroel A, Requejo-Isidro J. Quantitative TCSPC FRET-FLIM Applied to Donors Exhibiting Multi-Exponential Decays: Spatio-Temporal Interaction Between Calmodulin and the Kv7.2 Potassium Channel in Living Cells. Biophys J 2011. [DOI: 10.1016/j.bpj.2010.12.1217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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11
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Villarroel A, Gomez-Posada JC, Aivar P, Alaimo A, Etxeberria A, Fernandez-Orth J, Areso P, Alberdi A. Calmodulin Independent Trafficking of Kv7.2 Channels. Biophys J 2011. [DOI: 10.1016/j.bpj.2010.12.2434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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