1
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Krumm L, Pozner T, Zagha N, Coras R, Arnold P, Tsaktanis T, Scherpelz K, Davis MY, Kaindl J, Stolzer I, Süß P, Khundadze M, Hübner CA, Riemenschneider MJ, Baets J, Günther C, Jayadev S, Rothhammer V, Krach F, Winkler J, Winner B, Regensburger M. Neuroinflammatory disease signatures in SPG11-related hereditary spastic paraplegia patients. Acta Neuropathol 2024; 147:28. [PMID: 38305941 PMCID: PMC10837238 DOI: 10.1007/s00401-023-02675-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 12/15/2023] [Accepted: 12/22/2023] [Indexed: 02/03/2024]
Abstract
Biallelic loss of SPG11 function constitutes the most frequent cause of complicated autosomal recessive hereditary spastic paraplegia (HSP) with thin corpus callosum, resulting in progressive multisystem neurodegeneration. While the impact of neuroinflammation is an emerging and potentially treatable aspect in neurodegenerative diseases and leukodystrophies, the role of immune cells in SPG11-HSP patients is unknown. Here, we performed a comprehensive immunological characterization of SPG11-HSP, including examination of three human postmortem brain donations, immunophenotyping of patients' peripheral blood cells and patient-specific induced pluripotent stem cell-derived microglia-like cells (iMGL). We delineate a previously unknown role of innate immunity in SPG11-HSP. Neuropathological analysis of SPG11-HSP patient brain tissue revealed profound microgliosis in areas of neurodegeneration, downregulation of homeostatic microglial markers and cell-intrinsic accumulation of lipids and lipofuscin in IBA1+ cells. In a larger cohort of SPG11-HSP patients, the ratio of peripheral classical and intermediate monocytes was increased, along with increased serum levels of IL-6 that correlated with disease severity. Stimulation of patient-specific iMGLs with IFNγ led to increased phagocytic activity compared to control iMGL as well as increased upregulation and release of proinflammatory cytokines and chemokines, such as CXCL10. On a molecular basis, we identified increased STAT1 phosphorylation as mechanism connecting IFNγ-mediated immune hyperactivation and SPG11 loss of function. STAT1 expression was increased both in human postmortem brain tissue and in an Spg11-/- mouse model. Application of an STAT1 inhibitor decreased CXCL10 production in SPG11 iMGL and rescued their toxic effect on SPG11 neurons. Our data establish neuroinflammation as a novel disease mechanism in SPG11-HSP patients and constitute the first description of myeloid cell/ microglia activation in human SPG11-HSP. IFNγ/ STAT1-mediated neurotoxic effects of hyperreactive microglia upon SPG11 loss of function indicate that immunomodulation strategies may slow down disease progression.
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Affiliation(s)
- Laura Krumm
- Department of Stem Cell Biology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Tatyana Pozner
- Department of Stem Cell Biology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Naime Zagha
- Department of Stem Cell Biology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Roland Coras
- Department of Neuropathology, FAU Erlangen-Nürnberg, Erlangen, Germany
| | - Philipp Arnold
- Institute of Functional and Clinical Anatomy, FAU Erlangen-Nürnberg, Erlangen, Germany
| | - Thanos Tsaktanis
- Department of Neurology, University Hospital Erlangen, FAU Erlangen-Nürnberg, Erlangen, Germany
| | - Kathryn Scherpelz
- Division of Neuropathology, Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, USA
| | - Marie Y Davis
- Department of Neurology, University of Washington Medical Center, Seattle, WA, USA
- VA Puget Sound Healthcare System, Seattle, WA, USA
| | - Johanna Kaindl
- Department of Stem Cell Biology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Iris Stolzer
- Department of Medicine 1, University Hospital Erlangen, FAU Erlangen-Nürnberg, Erlangen, Germany
| | - Patrick Süß
- Department of Neurology, University Hospital Erlangen, FAU Erlangen-Nürnberg, Erlangen, Germany
| | - Mukhran Khundadze
- Institute of Human Genetics, Jena University Hospital Friedrich-Schiller-University Jena, Jena, Germany
| | - Christian A Hübner
- Institute of Human Genetics, Jena University Hospital Friedrich-Schiller-University Jena, Jena, Germany
- Center for Rare Diseases, Jena University Hospital, Friedrich Schiller University Jena, Jena, Germany
| | | | - Jonathan Baets
- Translational Neurosciences, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
- Laboratory of Neuromuscular Pathology, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
- Neuromuscular Reference Centre, Department of Neurology, Antwerp University Hospital, Antwerp, Belgium
| | - Claudia Günther
- Department of Medicine 1, University Hospital Erlangen, FAU Erlangen-Nürnberg, Erlangen, Germany
- Deutsches Zentrum Immuntherapie (DZI), University Hospital Erlangen, Kussmaulallee 4, 91054, Erlangen, Germany
| | - Suman Jayadev
- Department of Neurology, University of Washington Medical Center, Seattle, WA, USA
- Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA, USA
- Division of Medical Genetics, University of Washington, Seattle, WA, USA
| | - Veit Rothhammer
- Department of Neurology, University Hospital Erlangen, FAU Erlangen-Nürnberg, Erlangen, Germany
| | - Florian Krach
- Department of Stem Cell Biology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Jürgen Winkler
- Center for Rare Diseases Erlangen (ZSEER), University Hospital Erlangen, FAU Erlangen-Nürnberg, Erlangen, Germany
- Department of Molecular Neurology, FAU Erlangen-Nürnberg, Erlangen, Germany
| | - Beate Winner
- Department of Stem Cell Biology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
- Center for Rare Diseases Erlangen (ZSEER), University Hospital Erlangen, FAU Erlangen-Nürnberg, Erlangen, Germany
| | - Martin Regensburger
- Department of Stem Cell Biology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany.
- Deutsches Zentrum Immuntherapie (DZI), University Hospital Erlangen, Kussmaulallee 4, 91054, Erlangen, Germany.
- Center for Rare Diseases Erlangen (ZSEER), University Hospital Erlangen, FAU Erlangen-Nürnberg, Erlangen, Germany.
- Department of Molecular Neurology, FAU Erlangen-Nürnberg, Erlangen, Germany.
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2
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Hobson BD, Stanley AT, De Los Santos MB, Culbertson B, Mosharov EV, Sims PA, Sulzer D. Conserved and cell type-specific transcriptional responses to IFN-γ in the ventral midbrain. Brain Behav Immun 2023; 111:277-291. [PMID: 37100211 PMCID: PMC10460506 DOI: 10.1016/j.bbi.2023.04.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 03/28/2023] [Accepted: 04/23/2023] [Indexed: 04/28/2023] Open
Abstract
Dysregulated inflammation within the central nervous system (CNS) contributes to neuropathology in infectious, autoimmune, and neurodegenerative disease. With the exception of microglia, major histocompatibility complex (MHC) proteins are virtually undetectable in the mature, healthy central nervous system (CNS). Neurons have generally been considered incapable of antigen presentation, and although interferon gamma (IFN-γ) can elicit neuronal MHC class I (MHC-I) expression and antigen presentation in vitro, it has been unclear whether similar responses occur in vivo. Here we directly injected IFN-γ into the ventral midbrain of mature mice and analyzed gene expression profiles of specific CNS cell types. We found that IFN-γ upregulated MHC-I and associated mRNAs in ventral midbrain microglia, astrocytes, oligodendrocytes, and GABAergic, glutamatergic, and dopaminergic neurons. The core set of IFN-γ-induced genes and their response kinetics were similar in neurons and glia, but with a lower amplitude of expression in neurons. A diverse repertoire of genes was upregulated in glia, particularly microglia, which were the only cells to undergo cellular proliferation and express MHC classII (MHC-II) and associated genes. To determine if neurons respond directly via cell-autonomous IFN-γ receptor (IFNGR) signaling, we produced mutant mice with a deletion of the IFN-γ-binding domain of IFNGR1 in dopaminergic neurons, which resulted in a complete loss of dopaminergic neuronal responses to IFN-γ. Our results demonstrate that IFN-γ induces neuronal IFNGR signaling and upregulation of MHC-I and related genes in vivo, although the expression level is low compared to oligodendrocytes, astrocytes, and microglia.
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Affiliation(s)
- Benjamin D Hobson
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032, United States; Medical Scientist Training Program, Columbia University Irving Medical Center, New York, NY 10032, United States; Department of Psychiatry, Columbia University Irving Medical Center, New York, NY 10032, United States; Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY 10032, United States
| | - Adrien T Stanley
- Department of Psychiatry, Columbia University Irving Medical Center, New York, NY 10032, United States; Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY 10032, United States
| | - Mark B De Los Santos
- Department of Psychiatry, Columbia University Irving Medical Center, New York, NY 10032, United States; Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY 10032, United States
| | - Bruce Culbertson
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032, United States; Medical Scientist Training Program, Columbia University Irving Medical Center, New York, NY 10032, United States
| | - Eugene V Mosharov
- Department of Psychiatry, Columbia University Irving Medical Center, New York, NY 10032, United States; Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY 10032, United States
| | - Peter A Sims
- Department of Systems Biology, Columbia University Irving Medical Center, New York, NY 10032, United States; Department of Biochemistry & Molecular Biophysics, Columbia University Irving Medical Center, New York, NY 10032, United States; Sulzberger Columbia Genome Center, Columbia University Irving Medical Center, New York, NY 10032, United States; Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD, United States.
| | - David Sulzer
- Department of Neurology, Columbia University Irving Medical Center, New York, NY 10032, United States; Department of Psychiatry, Columbia University Irving Medical Center, New York, NY 10032, United States; Department of Pharmacology, Columbia University Irving Medical Center, New York, NY 10032, United States; Division of Molecular Therapeutics, New York State Psychiatric Institute, New York, NY 10032, United States; Aligning Science Across Parkinson's (ASAP) Collaborative Research Network, Chevy Chase, MD, United States.
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3
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Chen Y, Tian B. IFN-γ promotes the development of systemic lupus erythematosus through the IFNGR1/2-PSTAT1-TBX21 signaling axis. Am J Transl Res 2022; 14:6874-6888. [PMID: 36398225 PMCID: PMC9641460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 08/18/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND Systemic lupus erythematosus (SLE) is a chronic disease that causes inflammation in cartilage and the lining of blood vessels. Emerging evidence implicates IFN-γ as a major effector molecule in SLE during both active and stable stages. Here, we investigated the effects of IFN-γ on cytokines that play an autoimmune disease-promoting role and Th1-versus-Th2 and B cell dualism in SLE patients and mouse models of SLE. METHODS The levels of pro-inflammatory factors CXCL11, IFN-γ, IL-1β and IL-4, and immune complexes IgG, anti-dsDNA and anti-RNP were assessed through enzyme-linked immunosorbent assays (ELISA). Flow cytometry was performed to measure Th1, Th2 and B cell counts and IFNGR1, IFNGR2, pSTAT1 and TBX21 expression. The pathology of renal tissue from mouse SLE models was investigated through Hematoxylin eosin (H&E) staining. The levels of IgG, anti-dsDNA and anti-RNP were determined through immunofluorescence (IF) assays. RESULTS Skin damage was observed in SLE patients in both active and stable stages. ELISA analysis showed that SLE patients displayed higher levels of pro-inflammatory factors (CXCL11, IFN-γ, IL-1β and IL-4) and immune complexes (IgG, anti-dsDNA and anti-RNP). The percentage of Th1 and B cells was increased in blood samples from SLE patients with skin lesions (SL) or lupus nephritis (LN). The percentage of Th2 cells among the groups were comparable. Higher levels of IFNGR1, IFNGR2, pSTAT1 and TBX21 were observed in Th1 but not Th2 cells. In SLE mouse models, H&E staining revealed fewer immune complexes in glomerular endothelial cells and decreased hyaline thrombus in the capillary lumen following treatment with anti-IFN-γ antibodies or following IFNGR1 or STAT1 silencing. CONCLUSION IFN-γ contributes to the pathogenesis of SLE through the IFNGR1/2-pSTAT1-TBX21 axis and regulates inflammation and immune complex formation in SLE mice.
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Affiliation(s)
- Ying Chen
- Department of Nephrology, First Affiliated Hospital of China Medical UniversityShenyang 100012, Liaoning, China
| | - Bailing Tian
- Department of Rheumatology and Immunology, First Affiliated Hospital of China Medical UniversityShenyang 100012, Liaoning, China
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4
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Kouraki A, Doherty M, Fernandes GS, Zhang W, Walsh DA, Kelly A, Valdes AM. Different genes may be involved in distal and local sensitisation: a genome-wide gene-based association study and meta-analysis. Eur J Pain 2021; 26:740-753. [PMID: 34958702 PMCID: PMC9303629 DOI: 10.1002/ejp.1902] [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: 07/12/2021] [Revised: 11/11/2021] [Accepted: 12/25/2021] [Indexed: 11/22/2022]
Abstract
Background Neuropathic pain symptoms and signs of increased pain sensitization in osteoarthritis (OA) patients may explain persistent pain after total joint replacement (TJR). Therefore, identifying genetic markers associated with pain sensitization and neuropathic‐like pain phenotypes could be clinically important in identifying targets for early intervention. Methods We performed a genome‐wide gene‐based association study (GWGAS) using pressure pain detection thresholds (PPTs) from distal pain‐free sites (anterior tibia), a measure of distal sensitization, and from proximal pain‐affected sites (lateral joint line), a measure of local sensitization, in 320 knee OA participants from the Knee Pain and related health in the Community (KPIC) cohort. We next performed gene‐based fixed‐effects meta‐analysis of PPTs and a neuropathic‐like pain phenotype using genome‐wide association study (GWAS) data from KPIC and from an independent cohort of 613 post‐TJR participants, respectively. Results The most significant genes associated with distal and local sensitization were OR5B3 and BRDT, respectively. We also found previously identified neuropathic pain‐associated genes—KCNA1, MTOR, ADORA1 and SCN3B—associated with PPT at the anterior tibia and an inflammatory pain gene—PTAFR—associated with PPT at the lateral joint line. Meta‐analysis results of anterior tibia and neuropathic‐like pain phenotypes revealed genes associated with bone morphogenesis, neuro‐inflammation, obesity, type 2 diabetes, cardiovascular disease and cognitive function. Conclusions Overall, our results suggest that different biological processes might be involved in distal and local sensitization, and common genetic mechanisms might be implicated in distal sensitization and neuropathic‐like pain. Future studies are needed to replicate these findings. Significance To the best of our knowledge, this is the first GWAS for pain sensitization and the first gene‐based meta‐analysis of pain sensitization and neuropathic‐like pain. Higher pain sensitization and neuropathic pain symptoms are associated with persistent pain after surgery hence, identifying genetic biomarkers and molecular pathways associated with these traits is clinically relevant.
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Affiliation(s)
- A Kouraki
- Academic Rheumatology, School of Medicine, University of Nottingham, Nottingham City Hospital, Nottingham, NG5 1PB, United Kingdom.,NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, NG5 1PB, United Kingdom
| | - M Doherty
- Academic Rheumatology, School of Medicine, University of Nottingham, Nottingham City Hospital, Nottingham, NG5 1PB, United Kingdom.,Pain Centre Versus Arthritis, University of Nottingham, Nottingham, NG5 1PB, United Kingdom.,Versus Arthritis Centre for Sports, Exercise and Osteoarthritis, University of Nottingham, Nottingham, NG7 2UH, United Kingdom.,NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, NG5 1PB, United Kingdom
| | - G S Fernandes
- Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, BS1 6EH, United Kingdom
| | - W Zhang
- Academic Rheumatology, School of Medicine, University of Nottingham, Nottingham City Hospital, Nottingham, NG5 1PB, United Kingdom.,Pain Centre Versus Arthritis, University of Nottingham, Nottingham, NG5 1PB, United Kingdom.,Versus Arthritis Centre for Sports, Exercise and Osteoarthritis, University of Nottingham, Nottingham, NG7 2UH, United Kingdom.,NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, NG5 1PB, United Kingdom
| | - D A Walsh
- Academic Rheumatology, School of Medicine, University of Nottingham, Nottingham City Hospital, Nottingham, NG5 1PB, United Kingdom.,Pain Centre Versus Arthritis, University of Nottingham, Nottingham, NG5 1PB, United Kingdom.,Versus Arthritis Centre for Sports, Exercise and Osteoarthritis, University of Nottingham, Nottingham, NG7 2UH, United Kingdom.,NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, NG5 1PB, United Kingdom
| | - A Kelly
- Academic Rheumatology, School of Medicine, University of Nottingham, Nottingham City Hospital, Nottingham, NG5 1PB, United Kingdom.,NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, NG5 1PB, United Kingdom
| | - A M Valdes
- Academic Rheumatology, School of Medicine, University of Nottingham, Nottingham City Hospital, Nottingham, NG5 1PB, United Kingdom.,Pain Centre Versus Arthritis, University of Nottingham, Nottingham, NG5 1PB, United Kingdom.,NIHR Nottingham Biomedical Research Centre, University of Nottingham, Nottingham, NG5 1PB, United Kingdom
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5
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Wang G, Zhang H, Sun J, Zhang Y, He F, Zou J. Cyclosporin A impairs neurogenesis and cognitive abilities in brain development via the IFN-γ-Shh-BDNF pathway. Int Immunopharmacol 2021; 96:107744. [PMID: 33993101 DOI: 10.1016/j.intimp.2021.107744] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 04/15/2021] [Accepted: 04/29/2021] [Indexed: 01/07/2023]
Abstract
A wealth of evidence indicate that the peripheral immune activation alters brain development. However, it is still largely unclear whether and how peripheral immunosuppression affects neurodevelopment. Here, we found that the immunosuppressant cyclosporin A (CsA) decreased the number of BrdU+, BrdU+/DCX+, BrdU+/NeuN + cells in the hippocampus, impaired learning and memory and inhibited protein levels of the shh signaling pathway, including Shh, Smo and Gli1. However, the shh pathway receptor agonist SAG could block the impairment of cognitive ability and the decrease of hippocampal neurogenesis and brain-derived neurotrophic factor (BDNF) level induced by CsA. We also found that CsA decreased the level of interferon-gamma (IFN-γ), while up-regulation of IFN-γ altered the inhibitory effect of the shh signaling pathway and the decrease of BDNF induced by CsA. Collectively, these data indicate that peripheral CsA impairs neurogenesis and cognition in brain development through downregulating the IFN-γ-Shh-BDNF pathway. The present study guides us to correctly apply immunomodulatory drugs in early life and suggests that the IFN-γ-Shh-BDNF pathway may represent a novel protective target for neurodevelopment under the condition of immunosuppression.
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Affiliation(s)
- Ge Wang
- Department of Anatomy and Neurobiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, People's Republic of China; Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, 200032 Shanghai, People's Republic of China
| | - Hongyang Zhang
- Department of Anatomy and Neurobiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, People's Republic of China
| | - Jiancong Sun
- Department of Radiation Oncology, First Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Yuwei Zhang
- Department of Anatomy, Wannan Medical College, Wuhu, Anhui, People's Republic of China
| | - Fen He
- Department of Radiation Oncology, First Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong, People's Republic of China.
| | - Juntao Zou
- Department of Anatomy and Neurobiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, People's Republic of China.
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6
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Koller EJ, Gonzalez De La Cruz E, Machula T, Ibanez KR, Lin WL, Williams T, Riffe CJ, Ryu D, Strang KH, Liu X, Janus C, Golde TE, Dickson D, Giasson BI, Chakrabarty P. Combining P301L and S320F tau variants produces a novel accelerated model of tauopathy. Hum Mol Genet 2020; 28:3255-3269. [PMID: 31261380 DOI: 10.1093/hmg/ddz151] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 05/22/2019] [Accepted: 06/21/2019] [Indexed: 01/14/2023] Open
Abstract
Understanding the biological functions of tau variants can illuminate differential etiologies of Alzheimer's disease (AD) and primary tauopathies. Though the end-stage neuropathological attributes of AD and primary tauopathies are similar, the etiology and behavioral outcomes of these diseases follow unique and divergent trajectories. To study the divergent physiological properties of tau variants on a uniform immunogenetic background, we created somatic transgenesis CNS models of tauopathy utilizing neonatal delivery of adeno-associated viruses expressing wild-type (WT) or mutant tau in non-transgenic mice. We selected four different tau variants-WT tau associated with AD, P301L mutant tau associated with frontotemporal dementia (FTD), S320F mutant tau associated with Pick's disease and a combinatorial approach using P301L/S320F mutant tau. CNS-targeted expression of WT and P301L mutant tau results in robust tau hyperphosphorylation without tangle pathology, gradually developing age-progressive memory deficits. In contrast, the S320F variant, especially in combination with P301L, produces an AD-type tangle pathology, focal neuroinflammation and memory impairment on an accelerated time scale. Using the doubly mutated P301L/S320F tau variant, we demonstrate that combining different mutations can have an additive effect on neuropathologies and associated co-morbidities, possibly hinting at involvement of unique functional pathways. Importantly, we also show that overexpression of wild-type tau as well as an FTD-associated tau variant can lead to cognitive deficits even in the absence of tangles. Together, our data highlights the synergistic neuropathologies and associated cognitive and synaptic alterations of the combinatorial tau variant leading to a robust model of tauopathy.
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Affiliation(s)
- Emily J Koller
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.,Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA
| | - Elsa Gonzalez De La Cruz
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA
| | - Timothy Machula
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA
| | - Kristen R Ibanez
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA
| | - Wen-Lang Lin
- Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, USA
| | - Tosha Williams
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.,Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA
| | - Cara J Riffe
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA
| | - Daniel Ryu
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA
| | - Kevin H Strang
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.,Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA
| | - Xuefei Liu
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA
| | - Christopher Janus
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.,Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA
| | - Todd E Golde
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.,Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA.,McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Dennis Dickson
- Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, USA
| | - Benoit I Giasson
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.,Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA.,McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Paramita Chakrabarty
- Department of Neuroscience, University of Florida, Gainesville, FL, USA.,Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, USA.,McKnight Brain Institute, University of Florida, Gainesville, FL, USA
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7
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Diffusion magnetic resonance imaging-derived free water detects neurodegenerative pattern induced by interferon-γ. Brain Struct Funct 2020; 225:427-439. [PMID: 31894407 DOI: 10.1007/s00429-019-02017-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Accepted: 12/17/2019] [Indexed: 12/18/2022]
Abstract
Imaging biomarkers for immune activation may be valuable for early-stage detection, therapeutic testing, and research on neurodegenerative conditions. In the present study, we determined whether diffusion magnetic resonance imaging-derived free water signal is a sensitive marker for neuroinflammatory effects of interferon-gamma (Ifn-γ). Neonatal wild-type mice were injected in the cerebral ventricles with recombinant adeno-associated viruses expressing the inflammatory cytokine Ifn-γ. Groups of mice expressing Ifn-γ and age-matched controls were imaged at 1, 5 and 8 months. Mice deficient in Ifngr1-/- and Stat1-/- were scanned at 5 months as controls for the signaling cascades activated by Ifn-γ. The results indicate that Ifn-γ affected fractional anisotropy (FA), mean diffusivity (MD), and free water (FW) in white matter structures, midline cortical areas, and medial thalamic areas. In these structures, FA and MD decreased progressively from 1 to 8 months of age, while FW increased significantly. The observed reductions in FA and MD and increased FW with elevated brain Ifn-γ was not observed in Ifngr1-/- or Stat1-/- mice. These results suggest that the observed microstructure changes involve the Ifn-gr1 and Stat1 signaling. Interestingly, increases in FW were observed in midbrain of Ifngr1-/- mice, which suggests alternative Ifn-γ signaling in midbrain. Although initial evidence is offered in relation to the sensitivity of the FW signal to neurodegenerative and/or inflammatory patterns specific to Ifn-γ, further research is needed to determine applicability and specificity across animal models of neuroinflammatory and degenerative disorders.
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8
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Mortezaei Z, Cazier JB, Mehrabi AA, Cheng C, Masoudi-Nejad A. Novel putative drugs and key initiating genes for neurodegenerative disease determined using network-based genetic integrative analysis. J Cell Biochem 2018; 120:5459-5471. [PMID: 30302804 DOI: 10.1002/jcb.27825] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 09/12/2018] [Indexed: 12/26/2022]
Abstract
Understanding the genetic causes of neurodegenerative disease (ND) can be useful for their prevention and treatment. Among the genetic variations responsible for ND, heritable germline variants have been discovered in genome-wide association studies (GWAS), and nonheritable somatic mutations have been discovered in sequencing projects. Distinguishing the important initiating genes in ND and comparing the importance of heritable and nonheritable genetic variants for treating ND are important challenges. In this study, we analysed GWAS results, somatic mutations and drug targets of ND from large databanks by performing directed network-based analysis considering a randomised network hypothesis testing procedure. A disease-associated biological network was created in the context of the functional interactome, and the nonrandom topological characteristics of directed-edge classes were interpreted. Hierarchical network analysis indicated that drug targets tend to lie upstream of somatic mutations and germline variants. Furthermore, using directed path length information and biological explanations, we provide information on the most important genes in these created node classes and their associated drugs. Finally, we identified nine germline variants overlapping with drug targets for ND, seven somatic mutations close to drug targets from the hierarchical network analysis and six crucial genes in controlling other genes from the network analysis. Based on these findings, some drugs have been proposed for treating ND via drug repurposing. Our results provide new insights into the therapeutic actionability of GWAS results and somatic mutations for ND. The interesting properties of each node class and the existing relationships between them can broaden our knowledge of ND.
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Affiliation(s)
- Zahra Mortezaei
- Laboratory of Systems Biology and Bioinformatics (LBB), Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - Jean-Baptiste Cazier
- Centre for Computational Biology, Haworth Building, University of Birmingham, Birmingham, UK
| | - Ali Ashraf Mehrabi
- Department of Biometry and Plant Genetics, University of Ilam, Ilam, Iran
| | - Chao Cheng
- Department of Biomedical Data Sciences, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire
| | - Ali Masoudi-Nejad
- Laboratory of Systems Biology and Bioinformatics (LBB), Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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