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Al-Dalahmah O, Lam M, McInvale JJ, Qu W, Nguyen T, Mun JY, Kwon S, Ifediora N, Mahajan A, Humala N, Winters T, Angeles E, Jakubiak KA, Kühn R, Kim YA, De Rosa MC, Doege CA, Paryani F, Flowers X, Dovas A, Mela A, Lu H, DeTure MA, Vonsattel JP, Wszolek ZK, Dickson DW, Kuhlmann T, Zaehres H, Schöler HR, Sproul AA, Siegelin MD, De Jager PL, Goldman JE, Menon V, Canoll P, Hargus G. Osteopontin drives neuroinflammation and cell loss in MAPT-N279K frontotemporal dementia patient neurons. Cell Stem Cell 2024; 31:676-693.e10. [PMID: 38626772 DOI: 10.1016/j.stem.2024.03.013] [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: 04/04/2023] [Revised: 01/07/2024] [Accepted: 03/19/2024] [Indexed: 05/05/2024]
Abstract
Frontotemporal dementia (FTD) is an incurable group of early-onset dementias that can be caused by the deposition of hyperphosphorylated tau in patient brains. However, the mechanisms leading to neurodegeneration remain largely unknown. Here, we combined single-cell analyses of FTD patient brains with a stem cell culture and transplantation model of FTD. We identified disease phenotypes in FTD neurons carrying the MAPT-N279K mutation, which were related to oxidative stress, oxidative phosphorylation, and neuroinflammation with an upregulation of the inflammation-associated protein osteopontin (OPN). Human FTD neurons survived less and elicited an increased microglial response after transplantation into the mouse forebrain, which we further characterized by single nucleus RNA sequencing of microdissected grafts. Notably, downregulation of OPN in engrafted FTD neurons resulted in improved engraftment and reduced microglial infiltration, indicating an immune-modulatory role of OPN in patient neurons, which may represent a potential therapeutic target in FTD.
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Affiliation(s)
- Osama Al-Dalahmah
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA; Taub Institute for Research on Alzheimer's Disease & the Aging Brain, Columbia University, New York, NY 10032, USA
| | - Matti Lam
- Center for Translational & Computational Neuroimmunology, Department of Neurology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Julie J McInvale
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Wenhui Qu
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Trang Nguyen
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Jeong-Yeon Mun
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Sam Kwon
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Nkechime Ifediora
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Aayushi Mahajan
- Department of Neurosurgery, Columbia University, New York, NY 10032, USA
| | - Nelson Humala
- Department of Neurosurgery, Columbia University, New York, NY 10032, USA
| | - Tristan Winters
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Ellen Angeles
- Taub Institute for Research on Alzheimer's Disease & the Aging Brain, Columbia University, New York, NY 10032, USA
| | - Kelly A Jakubiak
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Rebekka Kühn
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Yoon A Kim
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Maria Caterina De Rosa
- Division of Molecular Genetics, Department of Pediatrics, Columbia University, New York, NY 10032, USA
| | - Claudia A Doege
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Fahad Paryani
- Center for Translational & Computational Neuroimmunology, Department of Neurology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Xena Flowers
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Athanassios Dovas
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Angeliki Mela
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Hong Lu
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Michael A DeTure
- Department of Neuroscience, The Mayo Clinic Florida, Jacksonville, FL 32224, USA
| | - Jean Paul Vonsattel
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Zbigniew K Wszolek
- Department of Neurology, The Mayo Clinic Florida, Jacksonville, FL 32224, USA
| | - Dennis W Dickson
- Department of Neuroscience, The Mayo Clinic Florida, Jacksonville, FL 32224, USA
| | - Tanja Kuhlmann
- Institute of Neuropathology, University Hospital Münster, Münster 48149, Germany
| | - Holm Zaehres
- Institute of Anatomy, Ruhr University Bochum, Medical Faculty, Bochum 44801, Germany; Max Planck Institute for Molecular Biomedicine, Münster 48149, Germany
| | - Hans R Schöler
- Max Planck Institute for Molecular Biomedicine, Münster 48149, Germany
| | - Andrew A Sproul
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA; Taub Institute for Research on Alzheimer's Disease & the Aging Brain, Columbia University, New York, NY 10032, USA
| | - Markus D Siegelin
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Philip L De Jager
- Taub Institute for Research on Alzheimer's Disease & the Aging Brain, Columbia University, New York, NY 10032, USA; Center for Translational & Computational Neuroimmunology, Department of Neurology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - James E Goldman
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA; Taub Institute for Research on Alzheimer's Disease & the Aging Brain, Columbia University, New York, NY 10032, USA
| | - Vilas Menon
- Taub Institute for Research on Alzheimer's Disease & the Aging Brain, Columbia University, New York, NY 10032, USA; Center for Translational & Computational Neuroimmunology, Department of Neurology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Peter Canoll
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA
| | - Gunnar Hargus
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA; Taub Institute for Research on Alzheimer's Disease & the Aging Brain, Columbia University, New York, NY 10032, USA.
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2
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Stephenson EL, Jain RW, Ghorbani S, Gorter RP, D’Mello C, Yong VW. Uncovering Novel Extracellular Matrix Transcriptome Alterations in Lesions of Multiple Sclerosis. Int J Mol Sci 2024; 25:1240. [PMID: 38279239 PMCID: PMC10816920 DOI: 10.3390/ijms25021240] [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: 12/10/2023] [Revised: 01/13/2024] [Accepted: 01/16/2024] [Indexed: 01/28/2024] Open
Abstract
The extracellular matrix (ECM) of the central nervous system (CNS) is an interconnected network of proteins and sugars with critical roles in both homeostasis and disease. In neurological diseases, excessive ECM deposition and remodeling impact both injury and repair. CNS lesions of multiple sclerosis (MS), a chronic inflammatory and degenerative disease, cause prominent alterations of the ECM. However, there are a lack of data investigating how the multitude of ECM members change in relation to each other and how this affects the MS disease course. Here, we evaluated ECM changes in MS lesions compared to a control brain using databases generated in-house through spatial mRNA-sequencing and through a public resource of single-nucleus RNA sequencing previously published by Absinta and colleagues. These results underline the importance of publicly available datasets to find new targets of interest, such as the ECM. Both spatial and public datasets demonstrated widespread changes in ECM molecules and their interacting proteins, including alterations to proteoglycans and glycoproteins within MS lesions. Some of the altered ECM members have been described in MS, but other highly upregulated members, including the SPARC family of proteins, have not previously been highlighted. SPARC family members are upregulated in other conditions by reactive astrocytes and may influence immune cell activation and MS disease course. The profound changes to the ECM in MS lesions deserve more scrutiny as they impact neuroinflammation, injury, and repair.
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Affiliation(s)
- Erin Laurel Stephenson
- Department of Pathology and Laboratory Medicine, University of Calgary, Calgary, AB T2N 2T9, Canada;
| | - Rajiv William Jain
- Hotchkiss Brain Institute and Department of Clinical Neurosciences, University of Calgary, Calgary, AB T2N 4N1, Canada; (R.W.J.); (S.G.); (R.P.G.); (C.D.)
| | - Samira Ghorbani
- Hotchkiss Brain Institute and Department of Clinical Neurosciences, University of Calgary, Calgary, AB T2N 4N1, Canada; (R.W.J.); (S.G.); (R.P.G.); (C.D.)
| | - Rianne Petra Gorter
- Hotchkiss Brain Institute and Department of Clinical Neurosciences, University of Calgary, Calgary, AB T2N 4N1, Canada; (R.W.J.); (S.G.); (R.P.G.); (C.D.)
| | - Charlotte D’Mello
- Hotchkiss Brain Institute and Department of Clinical Neurosciences, University of Calgary, Calgary, AB T2N 4N1, Canada; (R.W.J.); (S.G.); (R.P.G.); (C.D.)
| | - Voon Wee Yong
- Hotchkiss Brain Institute and Department of Clinical Neurosciences, University of Calgary, Calgary, AB T2N 4N1, Canada; (R.W.J.); (S.G.); (R.P.G.); (C.D.)
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3
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Sun C, Rahman MSU, Enkhjargal B, Peng J, Zhou K, Xie Z, Wu L, Zhang T, Zhu Q, Tang J, Zeng Y, Zhang JH, Xu S. Osteopontin modulates microglial activation states and attenuates inflammatory responses after subarachnoid hemorrhage in rats. Exp Neurol 2024; 371:114585. [PMID: 37884185 DOI: 10.1016/j.expneurol.2023.114585] [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: 05/15/2023] [Revised: 10/10/2023] [Accepted: 10/23/2023] [Indexed: 10/28/2023]
Abstract
AIMS Osteopontin (OPN) has demonstrated neuroprotective effects in various stroke models. Its role in neuroinflammation after brain injury remains to be elucidated. This study aims to clarify the effect of OPN on neuroinflammation, particularly on the functional states of microglia after subarachnoid hemorrhage (SAH). METHODS 77 rats were randomly divided into the following groups: Sham, SAH 24 h, SAH + rOPN, SAH + Vehicle (PBS), SAH + OPN siRNA, and SAH + Scr siRNA, SAH + rOPN+Fib-14 and SAH + rOPN+DMSO. Modified Garcia and beam balance tests were used to evaluate neurobehavioral outcomes. Semi-quantitative immunofluorescence staining was performed to measure expression of myeloperoxidase (MPO) and microglia activation state markers CD16, CD206 after SAH and recombinant OPN treatment. The quantification of microglia activation and functional markers CD16, CD206, TNF-α and IL-10 were further evaluated using Western-blotting. RESULTS Nasal administration of rOPN improved neurological dysfunction, attenuated neutrophil infiltration, and decreased expression of phenotypic and functional markers of pro-inflammatory microglia CD16 and TNF-α. It also promoted an anti-inflammatory microglial state, as evidenced by increased expression of CD206 and IL-10. Furthermore, after blocking the phosphorylation of FAK signaling, the effects of rOPN on microglial activation states were partially reversed. The downstream pathways of STAT3 and NF-κB also exhibited consistent changes, suggesting the involvement of the STAT3 and NF-κB pathways in OPN's modulation of microglial activation via integrin-FAK signaling. CONCLUSION OPN attenuates inflammatory responses after SAH by promoting an anti-inflammatory microglial state, potentially mediated through the integrin-FAK-STAT3 and NF-κB signaling pathways.
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Affiliation(s)
- Chengmei Sun
- Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China; College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Muhammad Saif Ur Rahman
- Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China; College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Budbazar Enkhjargal
- Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92354, USA
| | - Jianhua Peng
- Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92354, USA
| | - Keren Zhou
- Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92354, USA
| | - Zhiyi Xie
- Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92354, USA
| | - Lingyun Wu
- Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92354, USA
| | - Tongyu Zhang
- Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92354, USA
| | - Qiquan Zhu
- Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92354, USA
| | - Jiping Tang
- Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92354, USA
| | - Yujia Zeng
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - John H Zhang
- Department of Physiology and Pharmacology, Loma Linda University, Loma Linda, CA 92354, USA.
| | - Shanshan Xu
- Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China.
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Lalwani RC, Volmar CH, Wahlestedt C, Webster KA, Shehadeh LA. Contextualizing the Role of Osteopontin in the Inflammatory Responses of Alzheimer's Disease. Biomedicines 2023; 11:3232. [PMID: 38137453 PMCID: PMC10741223 DOI: 10.3390/biomedicines11123232] [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: 10/25/2023] [Revised: 12/01/2023] [Accepted: 12/03/2023] [Indexed: 12/24/2023] Open
Abstract
Alzheimer's disease (AD) is characterized by progressive accumulations of extracellular amyloid-beta (Aβ) aggregates from soluble oligomers to insoluble plaques and hyperphosphorylated intraneuronal tau, also from soluble oligomers to insoluble neurofibrillary tangles (NFTs). Tau and Aβ complexes spread from the entorhinal cortex of the brain to interconnected regions, where they bind pattern recognition receptors on microglia and astroglia to trigger inflammation and neurotoxicity that ultimately lead to neurodegeneration and clinical AD. Systemic inflammation is initiated by Aβ's egress into the circulation, which may be secondary to microglial activation and can confer both destructive and reparative actions. Microglial activation pathways and downstream drivers of Aβ/NFT neurotoxicity, including inflammatory regulators, are primary targets for AD therapy. Osteopontin (OPN), an inflammatory cytokine and biomarker of AD, is implicated in Aβ clearance and toxicity, microglial activation, and inflammation, and is considered to be a potential therapeutic target. Here, using the most relevant works from the literature, we review and contextualize the evidence for a central role of OPN and associated inflammation in AD.
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Affiliation(s)
- Roshni C. Lalwani
- Interdisciplinary Stem Cell Institute, Leonard M. Miller School of Medicine, University of Miami, Miami, FL 33136, USA;
| | - Claude-Henry Volmar
- Department of Psychiatry, Leonard M. Miller School of Medicine, University of Miami, Miami, FL 33136, USA; (C.-H.V.); (C.W.)
- Center for Therapeutic Innovation, Leonard M. Miller School of Medicine, University of Miami, Miami, FL 33136, USA
| | - Claes Wahlestedt
- Department of Psychiatry, Leonard M. Miller School of Medicine, University of Miami, Miami, FL 33136, USA; (C.-H.V.); (C.W.)
- Center for Therapeutic Innovation, Leonard M. Miller School of Medicine, University of Miami, Miami, FL 33136, USA
| | - Keith A. Webster
- Integene International Holdings, LLC, Miami, FL 33137, USA;
- Department of Ophthalmology, Baylor College of Medicine, Houston, TX 77030, USA
- Everglades BioPharma, Houston, TX 77098, USA
| | - Lina A. Shehadeh
- Interdisciplinary Stem Cell Institute, Leonard M. Miller School of Medicine, University of Miami, Miami, FL 33136, USA;
- Department of Medicine, Leonard M. Miller School of Medicine, University of Miami, Miami, FL 33136, USA
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5
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Lin EYH, Xi W, Aggarwal N, Shinohara ML. Osteopontin (OPN)/SPP1: from its biochemistry to biological functions in the innate immune system and the central nervous system (CNS). Int Immunol 2023; 35:171-180. [PMID: 36525591 PMCID: PMC10071791 DOI: 10.1093/intimm/dxac060] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022] Open
Abstract
Osteopontin (OPN) is a multifunctional protein, initially identified in osteosarcoma cells with its role of mediating osteoblast adhesion. Later studies revealed that OPN is associated with many inflammatory conditions caused by infections, allergic responses, autoimmunity and tissue damage. Many cell types in the peripheral immune system express OPN with various functions, which could be beneficial or detrimental. Also, more recent studies demonstrated that OPN is highly expressed in the central nervous system (CNS), particularly in microglia during CNS diseases and development. However, understanding of mechanisms underlying OPN's functions in the CNS is still limited. In this review, we focus on peripheral myeloid cells and CNS-resident cells to discuss the expression and functions of OPN.
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Affiliation(s)
- Elliot Yi-Hsin Lin
- Department of Immunology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Wen Xi
- Department of Immunology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Nupur Aggarwal
- Department of Immunology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Mari L Shinohara
- Department of Immunology, Duke University School of Medicine, Durham, NC 27710, USA
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC 27710, USA
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6
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Drake SS, Zaman A, Simas T, Fournier AE. Comparing RNA-sequencing datasets from astrocytes, oligodendrocytes, and microglia in multiple sclerosis identifies novel dysregulated genes relevant to inflammation and myelination. WIREs Mech Dis 2023; 15:e1594. [PMID: 36600404 DOI: 10.1002/wsbm.1594] [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: 06/20/2022] [Revised: 09/25/2022] [Accepted: 12/14/2022] [Indexed: 01/06/2023]
Abstract
Central nervous system (CNS) inflammation is a key factor in multiple sclerosis (MS). Invasion of peripheral immune cells into the CNS resulting from an unknown signal or combination of signals results in activation of resident immune cells and the hallmark feature of the disease: demyelinating lesions. These lesion sites are an amalgam of reactive peripheral and central immune cells, astrocytes, damaged and dying oligodendrocytes, and injured neurons and axons. Sustained inflammation affects cells directly located within the lesion site and further abnormalities are apparent diffusely throughout normal-appearing white matter and grey matter. It is only relatively recently, using animal models, new tissue sampling techniques, and next-generation sequencing, that molecular changes occurring in CNS resident cells have been broadly captured. Advances in cell isolation through Fluorescence Activated Cell Sorting (FACS) and laser-capture microdissection together with the emergence of single-cell sequencing have enabled researchers to investigate changes in gene expression in astrocytes, microglia, and oligodendrocytes derived from animal models of MS as well as from primary patient tissue. The contribution of some dysregulated pathways has been followed up in individual studies; however, corroborating results often go unreported between sequencing studies. To this end, we have consolidated results from numerous RNA-sequencing studies to identify and review novel patterns of differentially regulated genes and pathways occurring within CNS glial cells in MS. This article is categorized under: Neurological Diseases > Molecular and Cellular Physiology.
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Affiliation(s)
- Sienna S Drake
- McGill University, Montreal Neurological Institute, Montreal, Quebec, Canada
| | - Aliyah Zaman
- McGill University, Montreal Neurological Institute, Montreal, Quebec, Canada
| | - Tristan Simas
- McGill University, Montreal Neurological Institute, Montreal, Quebec, Canada
| | - Alyson E Fournier
- McGill University, Montreal Neurological Institute, Montreal, Quebec, Canada
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Klein I, Boenert J, Lange F, Christensen B, Wassermann MK, Wiesen MHJ, Olschewski DN, Rabenstein M, Müller C, Lehmann HC, Fink GR, Schroeter M, Rueger MA, Vay SU. Glia from the central and peripheral nervous system are differentially affected by paclitaxel chemotherapy via modulating their neuroinflammatory and neuroregenerative properties. Front Pharmacol 2022; 13:1038285. [PMID: 36408236 PMCID: PMC9666700 DOI: 10.3389/fphar.2022.1038285] [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: 09/06/2022] [Accepted: 10/06/2022] [Indexed: 11/07/2022] Open
Abstract
Glia are critical players in defining synaptic contacts and maintaining neuronal homeostasis. Both astrocytes as glia of the central nervous system (CNS), as well as satellite glial cells (SGC) as glia of the peripheral nervous system (PNS), intimately interact with microglia, especially under pathological conditions when glia regulate degenerative as well as regenerative processes. The chemotherapeutic agent paclitaxel evokes peripheral neuropathy and cognitive deficits; however, the mechanisms underlying these diverse clinical side effects are unclear. We aimed to elucidate the direct effects of paclitaxel on the function of astrocytes, microglia, and SGCs, and their glia-glia and neuronal-glia interactions. After intravenous application, paclitaxel was present in the dorsal root ganglia of the PNS and the CNS of rodents. In vitro, SGC enhanced the expression of pro-inflammatory factors and reduced the expression of neurotrophic factor NT-3 upon exposure to paclitaxel, resulting in predominantly neurotoxic effects. Likewise, paclitaxel induced a switch towards a pro-inflammatory phenotype in microglia, exerting neurotoxicity. In contrast, astrocytes expressed neuroprotective markers and increasingly expressed S100A10 after paclitaxel exposure. Astrocytes, and to a lesser extent SGCs, had regulatory effects on microglia independent of paclitaxel exposure. Data suggest that paclitaxel differentially modulates glia cells regarding their (neuro-) inflammatory and (neuro-) regenerative properties and also affects their interaction. By elucidating those processes, our data contribute to the understanding of the mechanistic pathways of paclitaxel-induced side effects in CNS and PNS.
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Affiliation(s)
- Ines Klein
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
| | - Janne Boenert
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
| | - Felix Lange
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
| | - Britt Christensen
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
| | - Meike K. Wassermann
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
| | - Martin H. J. Wiesen
- Center of Pharmacology, Therapeutic Drug Monitoring, University Hospital of Cologne, Cologne, Germany
| | - Daniel Navin Olschewski
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
| | - Monika Rabenstein
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
| | - Carsten Müller
- Center of Pharmacology, Therapeutic Drug Monitoring, University Hospital of Cologne, Cologne, Germany
| | - Helmar C. Lehmann
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
| | - Gereon Rudolf Fink
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
- Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Michael Schroeter
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
- Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Maria Adele Rueger
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
- Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Sabine Ulrike Vay
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Department of Neurology, Cologne, Germany
- *Correspondence: Sabine Ulrike Vay,
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8
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Kaisey M, Lashgari G, Fert-Bober J, Ontaneda D, Solomon AJ, Sicotte NL. An Update on Diagnostic Laboratory Biomarkers for Multiple Sclerosis. Curr Neurol Neurosci Rep 2022; 22:675-688. [PMID: 36269540 DOI: 10.1007/s11910-022-01227-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/12/2022] [Indexed: 01/27/2023]
Abstract
PURPOSE For many patients, the multiple sclerosis (MS) diagnostic process can be lengthy, costly, and fraught with error. Recent research aims to address the unmet need for an accurate and simple diagnostic process through discovery of novel diagnostic biomarkers. This review summarizes recent studies on MS diagnostic fluid biomarkers, with a focus on blood biomarkers, and includes discussion of technical limitations and practical applicability. RECENT FINDINGS This line of research is in its early days. Accurate and easily obtainable biomarkers for MS have not yet been identified and validated, but several approaches to uncover them are underway. Continue efforts to define laboratory diagnostic biomarkers are likely to play an increasingly important role in defining MS at the earliest stages, leading to better long-term clinical outcomes.
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Affiliation(s)
- Marwa Kaisey
- Cedars-Sinai Medical Center Department of Neurology, 127 S. San Vicente Blvd, A6600, Los Angeles, CA, 90048, USA.
| | - Ghazal Lashgari
- Cedars-Sinai Medical Center Department of Neurology, 127 S. San Vicente Blvd, A6600, Los Angeles, CA, 90048, USA
| | - Justyna Fert-Bober
- Cedars-Sinai Medical Center Department of Neurology, 127 S. San Vicente Blvd, A6600, Los Angeles, CA, 90048, USA
| | - Daniel Ontaneda
- Mellen Center for Multiple Sclerosis, Neurological Institute, Cleveland Clinic, 9500 Euclid Ave. U10 Mellen Center, Cleveland, OH, 44106, USA
| | - Andrew J Solomon
- Department of Neurological Sciences, Larner College of Medicine at the University of Vermont University Health Center, Arnold 2, 1 South Prospect Street, Burlington, VT, 05401, USA
| | - Nancy L Sicotte
- Cedars-Sinai Medical Center Department of Neurology, 127 S. San Vicente Blvd, A6600, Los Angeles, CA, 90048, USA
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9
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Rosmus DD, Lange C, Ludwig F, Ajami B, Wieghofer P. The Role of Osteopontin in Microglia Biology: Current Concepts and Future Perspectives. Biomedicines 2022; 10:biomedicines10040840. [PMID: 35453590 PMCID: PMC9027630 DOI: 10.3390/biomedicines10040840] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/26/2022] [Accepted: 03/27/2022] [Indexed: 12/14/2022] Open
Abstract
The innate immune landscape of the central nervous system (CNS), including the brain and the retina, consists of different myeloid cell populations with distinct tasks to fulfill. Whereas the CNS borders harbor extraparenchymal CNS-associated macrophages whose main duty is to build up a defense against invading pathogens and other damaging factors from the periphery, the resident immune cells of the CNS parenchyma and the retina, microglia, are highly dynamic cells with a plethora of functions during homeostasis and disease. Therefore, microglia are constantly sensing their environment and closely interacting with surrounding cells, which is in part mediated by soluble factors. One of these factors is Osteopontin (OPN), a multifunctional protein that is produced by different cell types in the CNS, including microglia, and is upregulated in neurodegenerative and neuroinflammatory conditions. In this review, we discuss the current literature about the interaction between microglia and OPN in homeostasis and several disease entities, including multiple sclerosis (MS), Alzheimer’s and cerebrovascular diseases (AD, CVD), amyotrophic lateral sclerosis (ALS), age-related macular degeneration (AMD) and diabetic retinopathy (DR), in the context of the molecular pathways involved in OPN signaling shaping the function of microglia. As nearly all CNS diseases are characterized by pathological alterations in microglial cells, accompanied by the disturbance of the homeostatic microglia phenotype, the emergence of disease-associated microglia (DAM) states and their interplay with factors shaping the DAM-signature, such as OPN, is of great interest for therapeutical interventions in the future.
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Affiliation(s)
| | - Clemens Lange
- Eye Center, Freiburg Medical Center, University of Freiburg, 79106 Freiburg, Germany; (C.L.); (F.L.)
- Ophtha-Lab, Department of Ophthalmology, St. Franziskus Hospital, 48145 Muenster, Germany
| | - Franziska Ludwig
- Eye Center, Freiburg Medical Center, University of Freiburg, 79106 Freiburg, Germany; (C.L.); (F.L.)
| | - Bahareh Ajami
- Department of Microbiology and Immunology, Oregon Health and Science University, Portland, OR 97239, USA;
| | - Peter Wieghofer
- Institute of Anatomy, Leipzig University, 04103 Leipzig, Germany;
- Cellular Neuroanatomy, Institute of Theoretical Medicine, Medical Faculty, Augsburg University, 86159 Augsburg, Germany
- Correspondence:
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10
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Stuckey SM, Ong LK, Collins-Praino LE, Turner RJ. Neuroinflammation as a Key Driver of Secondary Neurodegeneration Following Stroke? Int J Mol Sci 2021; 22:ijms222313101. [PMID: 34884906 PMCID: PMC8658328 DOI: 10.3390/ijms222313101] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/25/2021] [Accepted: 12/01/2021] [Indexed: 01/13/2023] Open
Abstract
Ischaemic stroke involves the rapid onset of focal neurological dysfunction, most commonly due to an arterial blockage in a specific region of the brain. Stroke is a leading cause of death and common cause of disability, with over 17 million people worldwide suffering from a stroke each year. It is now well-documented that neuroinflammation and immune mediators play a key role in acute and long-term neuronal tissue damage and healing, not only in the infarct core but also in distal regions. Importantly, in these distal regions, termed sites of secondary neurodegeneration (SND), spikes in neuroinflammation may be seen sometime after the initial stroke onset, but prior to the presence of the neuronal tissue damage within these regions. However, it is key to acknowledge that, despite the mounting information describing neuroinflammation following ischaemic stroke, the exact mechanisms whereby inflammatory cells and their mediators drive stroke-induced neuroinflammation are still not fully understood. As a result, current anti-inflammatory treatments have failed to show efficacy in clinical trials. In this review we discuss the complexities of post-stroke neuroinflammation, specifically how it affects neuronal tissue and post-stroke outcome acutely, chronically, and in sites of SND. We then discuss current and previously assessed anti-inflammatory therapies, with a particular focus on how failed anti-inflammatories may be repurposed to target SND-associated neuroinflammation.
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Affiliation(s)
- Shannon M. Stuckey
- Discipline of Anatomy and Pathology, School of Biomedicine, Faculty of Health and Medical Sciences, The University of Adelaide, Adelaide 5005, Australia; (S.M.S.); (L.E.C.-P.)
| | - Lin Kooi Ong
- School of Pharmacy, Monash University Malaysia, Subang Jaya 47500, Malaysia;
- School of Biomedical Sciences and Pharmacy and the Priority Research Centre for Stroke and Brain Injury, The University of Newcastle, Callaghan 2308, Australia
| | - Lyndsey E. Collins-Praino
- Discipline of Anatomy and Pathology, School of Biomedicine, Faculty of Health and Medical Sciences, The University of Adelaide, Adelaide 5005, Australia; (S.M.S.); (L.E.C.-P.)
| | - Renée J. Turner
- Discipline of Anatomy and Pathology, School of Biomedicine, Faculty of Health and Medical Sciences, The University of Adelaide, Adelaide 5005, Australia; (S.M.S.); (L.E.C.-P.)
- Correspondence: ; Tel.: +61-8-8313-3114
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11
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Nilsson G, Baburamani AA, Rutherford MA, Zhu C, Mallard C, Hagberg H, Vontell R, Wang X. White matter injury but not germinal matrix hemorrhage induces elevated osteopontin expression in human preterm brains. Acta Neuropathol Commun 2021; 9:166. [PMID: 34654477 PMCID: PMC8518254 DOI: 10.1186/s40478-021-01267-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 09/26/2021] [Indexed: 11/10/2022] Open
Abstract
Osteopontin (OPN) is a matricellular protein that mediates various physiological functions and is implicated in neuroinflammation, myelination, and perinatal brain injury. However, its expression in association with brain injury in preterm infants is unexplored. Here we examined the expression of OPN in postmortem brains of preterm infants and explored how this expression is affected in brain injury. We analyzed brain sections from cases with white matter injury (WMI) and cases with germinal matrix hemorrhage (GMH) and compared them to control cases having no brain injury. WMI cases displayed moderate to severe tissue injury in the periventricular and deep white matter that was accompanied by an increase of microglia with amoeboid morphology. Apart from visible hemorrhage in the germinal matrix, GMH cases displayed diffuse white matter injury in the periventricular and deep white matter. In non-injured preterm brains, OPN was expressed at low levels in microglia, astrocytes, and oligodendrocytes. OPN expression was significantly increased in regions with white matter injury in both WMI cases and GMH cases. The main cellular source of OPN in white matter injury areas was amoeboid microglia, although a significant increase was also observed in astrocytes in WMI cases. OPN was not expressed in the germinal matrix of any case, regardless of whether there was hemorrhage. In conclusion, preterm brain injury induces elevated OPN expression in microglia and astrocytes, and this increase is found in sites closely related to injury in the white matter regions but not with the hemorrhage site in the germinal matrix. Thus, it appears that OPN takes part in the inflammatory process in white matter injury in preterm infants, and these findings facilitate our understanding of OPN's role under both physiological and pathological conditions in the human brain that may lead to greater elucidation of disease mechanisms and potentially better treatment strategies.
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Affiliation(s)
- Gisela Nilsson
- Centre of Perinatal Medicine and Health, Institute of Neuroscience and Physiology, Department of Physiology, Sahlgrenska Academy, University of Gothenburg, 40530, Gothenburg, Sweden
| | - Ana A Baburamani
- Centre for the Developing Brain, Department of Perinatal Imaging and Health, School of Biomedical Engineering and Imaging Sciences, King's College London, King's Health Partners, St Thomas' Hospital, London, UK
| | - Mary A Rutherford
- Centre for the Developing Brain, Department of Perinatal Imaging and Health, School of Biomedical Engineering and Imaging Sciences, King's College London, King's Health Partners, St Thomas' Hospital, London, UK
| | - Changlian Zhu
- Department of Clinical Neuroscience, Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
- Henan Key Laboratory of Child Brain Injury and Pediatric Clinical Research Center, Institute of Neuroscience and Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Carina Mallard
- Centre of Perinatal Medicine and Health, Institute of Neuroscience and Physiology, Department of Physiology, Sahlgrenska Academy, University of Gothenburg, 40530, Gothenburg, Sweden
| | - Henrik Hagberg
- Centre of Perinatal Medicine and Health, Institute of Clinical Sciences, Department of Obstetrics and Gynecology, Sahlgrenska Academy, Gothenburg University, 40530, Gothenburg, Sweden
| | - Regina Vontell
- Centre for the Developing Brain, Department of Perinatal Imaging and Health, School of Biomedical Engineering and Imaging Sciences, King's College London, King's Health Partners, St Thomas' Hospital, London, UK
- University of Miami Brain Endowment Bank, Miami, FL, 33136, USA
| | - Xiaoyang Wang
- Centre of Perinatal Medicine and Health, Institute of Clinical Sciences, Department of Obstetrics and Gynecology, Sahlgrenska Academy, Gothenburg University, 40530, Gothenburg, Sweden.
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12
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Davaanyam D, Kim ID, Lee JK. Intranasal Delivery of RGD-Containing Osteopontin Heptamer Peptide Confers Neuroprotection in the Ischemic Brain and Augments Microglia M2 Polarization. Int J Mol Sci 2021; 22:ijms22189999. [PMID: 34576163 PMCID: PMC8466884 DOI: 10.3390/ijms22189999] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 09/07/2021] [Accepted: 09/13/2021] [Indexed: 11/16/2022] Open
Abstract
Osteopontin (OPN), a phosphorylated glycoprotein, is induced in response to tissue damage and inflammation in various organs, including the brain. In our previous studies, we reported the robust neuroprotective effects of the icosamer OPN peptide OPNpt20, containing arginine-glycine-aspartic acid (RGD) and serine-leucine-alanine-tyrosine (SLAY) motifs, in an animal model of transient focal ischemia and demonstrated that its anti-inflammatory, pro-angiogenic, and phagocytosis inducing functions are responsible for the neuroprotective effects. In the present study, we truncated OPNpt20 to 13 or 7 amino acid peptides containing RGD (R) and/or SLAY (S) motifs (OPNpt13RS, OPNpt7R, OPNpt7RS, and OPNpt7S), and their neuroprotective efficacy was examined in a rat middle cerebral artery occlusion (MCAO) model. Intranasal administration of all four peptides significantly reduced infarct volume; OPNpt7R (VPNGRGD), the 7-amino-acid peptide containing an RGD motif, was determined to be the most potent, with efficacy comparable to that of OPNpt20. Additionally, sensory–motor functional deficits of OPNpt7R-administered MCAO animals were significantly improved, as indicated by the modified neurological severity scores and rotarod test. Notably, the expression of M1 markers was suppressed, whereas that of M2 markers (Arginase 1, CD206, and VEGF) was significantly enhanced in OPNpt7R-treated primary microglia cultures. Inflammation resolution by OPNpt7R was further confirmed in MCAO animals, in which upregulation of anti-inflammatory cytokines (Arg1, IL-10, IL-4, and CD36) and enhanced efferocytosis were detected. Moreover, studies using three mutant peptides (OPNpt7R-RAA or OPNpt7R-RAD, where RGD was replaced with RAA or RAD, respectively, and OPNpt7R-sc containing scrambled sequences) revealed that the RGD motif plays a vital role in conferring neuroprotection. In conclusion, the RGD-containing OPN heptamer OPNpt7R exhibits neuroprotective effects in the post-ischemic brain by suppressing M1 markers and augmenting M2 polarization of microglia and the RGD motif plays a critical role in these activities.
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Vay SU, Olschewski DN, Petereit H, Lange F, Nazarzadeh N, Gross E, Rabenstein M, Blaschke SJ, Fink GR, Schroeter M, Rueger MA. Osteopontin regulates proliferation, migration, and survival of astrocytes depending on their activation phenotype. J Neurosci Res 2021; 99:2822-2843. [PMID: 34510519 DOI: 10.1002/jnr.24954] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 07/28/2021] [Accepted: 08/17/2021] [Indexed: 12/31/2022]
Abstract
The glycoprotein osteopontin is highly upregulated in central nervous system (CNS) disorders such as ischemic stroke. Osteopontin regulates cell growth, cell adhesion, homeostasis, migration, and survival of various cell types. Accordingly, osteopontin is considered an essential regulator of regeneration and repair in the ischemic milieu. Astrocytes are the most abundant cells in the CNS and play significant roles in health and disease. Astrocytes are involved in homeostasis, promote neuroprotection, and regulate synaptic plasticity. Upon activation, astrocytes may adopt different phenotypes, termed A1 and A2. The direct effects of osteopontin on astrocytes, especially in distinct activation states, are yet unknown. The current study aimed to elucidate the impact of osteopontin on resting and active astrocytes. We established an inflammatory in vitro model of activated (A1) primary astrocytes derived from neonatal wistar rats by exposure to a distinct combination of proinflammatory cytokines. To model ischemic stroke in vitro, astrocytes were subjected to oxygen and glucose deprivation (OGD) in the presence or absence of osteopontin. Osteopontin modulated the activation phenotype by attenuating A1- and restoring A2-marker expression without compromising the active astrocytes' immunocompetence. Osteopontin promoted the proliferation of active and the migration of resting astrocytes. Following transient OGD, osteopontin mitigated the delayed ongoing death of primary astrocytes, promoting their survival. Data suggest that osteopontin differentially regulates essential functions of resting and active astrocytes and confirm a significant regulatory role of osteopontin in an in vitro ischemia model. Furthermore, the data suggest that osteopontin constitutes a promising target for experimental therapies modulating neuroregeneration and repair.
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Affiliation(s)
- Sabine Ulrike Vay
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Daniel Navin Olschewski
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Helena Petereit
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Felix Lange
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Nilufar Nazarzadeh
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Elena Gross
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Monika Rabenstein
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Stefan Johannes Blaschke
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Gereon Rudolf Fink
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Michael Schroeter
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Maria Adele Rueger
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
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14
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Pedrero-Prieto CM, Frontiñán-Rubio J, Alcaín FJ, Durán-Prado M, Peinado JR, Rabanal-Ruiz Y. Biological Significance of the Protein Changes Occurring in the Cerebrospinal Fluid of Alzheimer's Disease Patients: Getting Clues from Proteomic Studies. Diagnostics (Basel) 2021; 11:1655. [PMID: 34573996 PMCID: PMC8467255 DOI: 10.3390/diagnostics11091655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/18/2021] [Accepted: 08/26/2021] [Indexed: 11/16/2022] Open
Abstract
The fact that cerebrospinal fluid (CSF) deeply irrigates the brain together with the relative simplicity of sample extraction from patients make this biological fluid the best target for biomarker discovery in neurodegenerative diseases. During the last decade, biomarker discovery has been especially fruitful for the identification new proteins that appear in the CSF of Alzheimer's disease (AD) patients together with amyloid-β (Aβ42), total tau (T-tau), and phosphorylated tau (P-tau). Thus, several proteins have been already stablished as important biomarkers, due to an increase (i.e., CHI3L1) or a decrease (i.e., VGF) in AD patients' CSF. Notwithstanding this, only a deep analysis of a database generated with all the changes observed in CSF across multiple proteomic studies, and especially those using state-of-the-art methodologies, may expose those components or metabolic pathways disrupted at different levels in AD. Deep comparative analysis of all the up- and down-regulated proteins across these studies revealed that 66% of the most consistent protein changes in CSF correspond to intracellular proteins. Interestingly, processes such as those associated to glucose metabolism or RXR signaling appeared inversely represented in CSF from AD patients in a significant manner. Herein, we discuss whether certain cellular processes constitute accurate indicators of AD progression by examining CSF. Furthermore, we uncover new CSF AD markers, such as ITAM, PTPRZ or CXL16, identified by this study.
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Affiliation(s)
- Cristina M. Pedrero-Prieto
- Department of Medical Sciences, Ciudad Real Medical School, Oxidative Stress and Neurodegeneration Group, CRIB, University of Castilla-La Mancha (UCLM), Paseo de Moledores SN, 13071 Ciudad Real, Spain; (C.M.P.-P.); (J.F.-R.); (F.J.A.); (M.D.-P.)
- Neuroplasticity and Neurodegeneration Laboratory, Ciudad Real Medical School, CRIB, University of Castilla-La Mancha (UCLM), 13005 Ciudad Real, Spain
| | - Javier Frontiñán-Rubio
- Department of Medical Sciences, Ciudad Real Medical School, Oxidative Stress and Neurodegeneration Group, CRIB, University of Castilla-La Mancha (UCLM), Paseo de Moledores SN, 13071 Ciudad Real, Spain; (C.M.P.-P.); (J.F.-R.); (F.J.A.); (M.D.-P.)
| | - Francisco J. Alcaín
- Department of Medical Sciences, Ciudad Real Medical School, Oxidative Stress and Neurodegeneration Group, CRIB, University of Castilla-La Mancha (UCLM), Paseo de Moledores SN, 13071 Ciudad Real, Spain; (C.M.P.-P.); (J.F.-R.); (F.J.A.); (M.D.-P.)
| | - Mario Durán-Prado
- Department of Medical Sciences, Ciudad Real Medical School, Oxidative Stress and Neurodegeneration Group, CRIB, University of Castilla-La Mancha (UCLM), Paseo de Moledores SN, 13071 Ciudad Real, Spain; (C.M.P.-P.); (J.F.-R.); (F.J.A.); (M.D.-P.)
| | - Juan R. Peinado
- Department of Medical Sciences, Ciudad Real Medical School, Oxidative Stress and Neurodegeneration Group, CRIB, University of Castilla-La Mancha (UCLM), Paseo de Moledores SN, 13071 Ciudad Real, Spain; (C.M.P.-P.); (J.F.-R.); (F.J.A.); (M.D.-P.)
| | - Yoana Rabanal-Ruiz
- Department of Medical Sciences, Ciudad Real Medical School, Oxidative Stress and Neurodegeneration Group, CRIB, University of Castilla-La Mancha (UCLM), Paseo de Moledores SN, 13071 Ciudad Real, Spain; (C.M.P.-P.); (J.F.-R.); (F.J.A.); (M.D.-P.)
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15
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Xiao Y, Hu X, Fan S, Zhong J, Mo X, Liu X, Hu Y. Single-Cell Transcriptome Profiling Reveals the Suppressive Role of Retinal Neurons in Microglia Activation Under Diabetes Mellitus. Front Cell Dev Biol 2021; 9:680947. [PMID: 34434927 PMCID: PMC8381733 DOI: 10.3389/fcell.2021.680947] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 07/20/2021] [Indexed: 01/16/2023] Open
Abstract
Diabetic retinopathy, as one of the common complications of diabetes mellitus, is the leading cause of blindness in the working-age population worldwide. The disease is characterized by damage to retinal vasculature, which is associated with the activation of retina microglial and induces chronic neurodegeneration. Previous studies have identified the effects of activated microglial on the retinal neurons, but the cellular and molecular mechanisms underlying microglial activation is largely unknown. Here, we performed scRNA-seq on the retina of non-human primates with diabetes mellitus, and identified cell-type-specific molecular changes of the six major cell types. By identifying the ligand-receptor expression patterns among different cells, we established the interactome of the whole retina. The data showed that TNF-α signal mediated the activation of microglia through an autocrine manner. And we found TGFβ2, which was upregulated in cone dramatically by hyperglycemia, inhibited microglia activation at the early stage of diabetic retinopathy. In summary, our study is the first to profile cell-specific molecular changes and the cell-cell interactome of retina under diabetes mellitus, paving a way to dissect the cellular and molecular mechanisms underlying early-stage diabetic retinopathy.
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Affiliation(s)
- Yuhua Xiao
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
| | - Xing Hu
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
| | - Shuxin Fan
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
| | - Jiawei Zhong
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
| | - Xinzhi Mo
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
| | - Xialin Liu
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
| | - Youjin Hu
- Zhongshan Ophthalmic Center, State Key Laboratory of Ophthalmology, Sun Yat-sen University, Guangzhou, China
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16
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Shi L, Sun Z, Su W, Xu F, Xie D, Zhang Q, Dai X, Iyer K, Hitchens TK, Foley LM, Li S, Stolz DB, Chen K, Ding Y, Thomson AW, Leak RK, Chen J, Hu X. Treg cell-derived osteopontin promotes microglia-mediated white matter repair after ischemic stroke. Immunity 2021; 54:1527-1542.e8. [PMID: 34015256 DOI: 10.1016/j.immuni.2021.04.022] [Citation(s) in RCA: 144] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 03/05/2021] [Accepted: 04/20/2021] [Indexed: 12/13/2022]
Abstract
The precise mechanisms underlying the beneficial effects of regulatory T (Treg) cells on long-term tissue repair remain elusive. Here, using single-cell RNA sequencing and flow cytometry, we found that Treg cells infiltrated the brain 1 to 5 weeks after experimental stroke in mice. Selective depletion of Treg cells diminished oligodendrogenesis, white matter repair, and functional recovery after stroke. Transcriptomic analyses revealed potent immunomodulatory effects of brain-infiltrating Treg cells on other immune cells, including monocyte-lineage cells. Microglia depletion, but not T cell lymphopenia, mitigated the beneficial effects of transferred Treg cells on white matter regeneration. Mechanistically, Treg cell-derived osteopontin acted through integrin receptors on microglia to enhance microglial reparative activity, consequently promoting oligodendrogenesis and white matter repair. Increasing Treg cell numbers by delivering IL-2:IL-2 antibody complexes after stroke improved white matter integrity and rescued neurological functions over the long term. These findings reveal Treg cells as a neurorestorative target for stroke recovery.
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Affiliation(s)
- Ligen Shi
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Zeyu Sun
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Wei Su
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Fei Xu
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA; Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA 15261, USA
| | - Di Xie
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Qingxiu Zhang
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Xuejiao Dai
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Kartik Iyer
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - T Kevin Hitchens
- Animal Imaging Center and Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA 15203, USA
| | - Lesley M Foley
- Animal Imaging Center and Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA 15203, USA
| | - Sicheng Li
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Donna B Stolz
- Center for Biologic Imaging, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Kong Chen
- Department of Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Ying Ding
- Department of Biostatistics, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Angus W Thomson
- Starzl Transplantation Institute, Department of Surgery and Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Rehana K Leak
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA; Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Jun Chen
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA; Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA 15261, USA
| | - Xiaoming Hu
- Pittsburgh Institute of Brain Disorders and Recovery and Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA; Geriatric Research, Education and Clinical Center, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, PA 15261, USA.
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17
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Microstructural and functional brain abnormalities in multiple sclerosis predicted by osteopontin and neurofilament light. Mult Scler Relat Disord 2021; 51:102923. [PMID: 33813096 DOI: 10.1016/j.msard.2021.102923] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 03/18/2021] [Accepted: 03/21/2021] [Indexed: 01/22/2023]
Abstract
BACKGROUND Osteopontin (OPN) is a proinflammatory biomarker, and neurofilament light chain (NFL) levels reflect axonal damage. Resting-state functional MRI (rs-fMRI) defines brain networks during wakeful rest. OBJECTIVE To examine, if levels of OPN and NFL are associated on the long term with (i) lesion evolution, (ii) changes in normal-appearing white matter (NAWM) microstructure and (iii) functional connectivity in multiple sclerosis (MS). METHODS Concentration of NFL and OPN in the blood and CSF were related to MRI findings 10.3 ± 2.8 years later in 53 patients with MS. NFL was examined by Simoa method, OPN by ELISA. Lesion volume in the brain and cervical spinal cord was examined by 3D FLAIR images. Voxel-wise images of fractional anisotropy (FA), axial diffusivity (AD), mean diffusivity (MD), and radial diffusivity (RD) were examined by tract-based spatial statistics corrected for gender, age and lesion volume. Metabolites were examined by single-voxel MR-spectroscopy in the NAWM. Fifty-five default mode network connections were examined by rs-fMRI corrected for gender, age, MS subtype and current therapy as covariates. RESULTS While NFL in paired serum and CSF positively correlated (p = 0.019), there was no correlation between serum and CSF OPN. Higher OPN levels in the CSF but not in the serum showed association with increased brain WM lesion volume (p = 0.009) in 10.3 ± 2.8 years. Higher OPN in the CSF was associated with reduced FA, increased MD, and reduced RD in different NAWM areas 10.3 ± 2.8 years later. Higher OPN in the serum and CSF were associated with increased connectivity strength between the medial prefrontal cortex (MPFC) and other regions except with inferior parietal lobule. NFL in the CSF and in the serum was associated with decreased connectivity strength except for ventral MPFC-hippocampal formation. Neither serum OPN nor NFL at the time of the MRI were associated with functional connectivity changes. CONCLUSION While serum NFL levels reflects CNS production, OPN in serum and CSF may have different cellular sources. OPN within the CSF but not in the serum may forecast development of lesions and microstructural abnormalities in 10 years, indicating the detrimental role of CNS inflammation on the long-term. Although both OPN and NFL in the CSF were associated with functional connectivity changes in 10 years, NFL was associated with decreased strength possibly indicating general axonal loss. In contrast, the positive association of OPN levels in the CSF with increased connectivity strength in 10 years may point to adaptive re-organization due to inflammatory WM lesions and microstructural changes.
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18
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Yu H, Zhong H, Li N, Chen K, Chen J, Sun J, Xu L, Wang J, Zhang M, Liu X, Deng L, Huang P, Huang S, Shen X, Zhong Y. Osteopontin activates retinal microglia causing retinal ganglion cells loss via p38 MAPK signaling pathway in glaucoma. FASEB J 2021; 35:e21405. [PMID: 33559950 DOI: 10.1096/fj.202002218r] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 12/30/2020] [Accepted: 01/15/2021] [Indexed: 02/07/2023]
Abstract
Microglia activation and release of pro-inflammatory cytokines have been closely linked to glaucoma. However, the mechanisms that initiate these pathways remain unclear. Here, we investigated the role of a pro-inflammatory cytokine--osteopontin (OPN), in retinal microglia activation process along with the underlying mechanisms in glaucoma. A rat chronic ocular hypertension (COH) model was established presenting an increase in retinal OPN level and activation of microglia. Primary microglia cells were isolated and cultured under a pressure culture system showing heightened expressions of microglia-derived OPN with changes in inflammatory factors (TNF-α, IL-1β, and IL-6). OPN and OPN neutralizing antibody (Anti-OPN) interventions were both applied systems for comparison, and cross-referenced with OPN knockdown in vitro. JAK/STAT, NF-κB, ERK1/2, and p38 MAPK, recognized as the primary signaling pathways related to microglia activation, were then screened on whether they can facilitate OPN to act on microglia and their impact on specific inhibitors. Thereafter, retrograde labeling of retinal ganglion cells (RGCs) and flash visual evoked potentials (F-VEP) were used to investigate neuron protection in context of each blockade. Results suggest that OPN is able to enhance the proliferation and activation of retinal microglia in experimental glaucoma which may play a role in the glaucomatous optic neuropathy, and contribute to the eventual RGCs loss and vision function impairment. Such effect may be mediated through the regulation of p38 MAPK signaling pathway.
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Affiliation(s)
- Huan Yu
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Huimin Zhong
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Na Li
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Kaizhe Chen
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Traumatology and Orthopaedics, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Junjue Chen
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Jun Sun
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Lili Xu
- Department of Emergency, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Jing Wang
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Mingui Zhang
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Xiaohong Liu
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Lianfu Deng
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Traumatology and Orthopaedics, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Ping Huang
- Shanghai Key Laboratory for Bone and Joint Diseases, Shanghai Institute of Traumatology and Orthopaedics, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Shouyue Huang
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Xi Shen
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
| | - Yisheng Zhong
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Shanghai, China
- Department of Ophthalmology, Zhoushan Branch of Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, Zhoushan, China
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19
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Plasma osteopontin as a biomarker of Alzheimer's disease and vascular cognitive impairment. Sci Rep 2021; 11:4010. [PMID: 33597603 PMCID: PMC7889621 DOI: 10.1038/s41598-021-83601-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 01/21/2021] [Indexed: 12/22/2022] Open
Abstract
Cerebrovascular disease (CeVD) and neurodegenerative dementia such as Alzheimer’s disease (AD) are frequently associated comorbidities in the elderly, sharing common risk factors and pathophysiological mechanisms including neuroinflammation. Osteopontin (OPN) is an inflammatory marker found upregulated in vascular diseases as well as in AD. However, its involvement in vascular dementia (VaD) and pre-dementia stages, namely cognitive impairment no dementia (CIND), both of which fall under the spectrum of vascular cognitive impairment (VCI), has yet to be examined. Its correlations with inflammatory cytokines in cognitive impairment also await investigation. 80 subjects with no cognitive impairment (NCI), 160 with CIND and 144 with dementia were included in a cross-sectional study on a Singapore-based memory clinic cohort. All subjects underwent comprehensive clinical, neuropsychological and brain neuroimaging assessments, together with clinical diagnoses based on established criteria. Blood samples were collected and OPN as well as inflammatory cytokines interleukin (IL)-6, IL-8 and tumor necrosis factor (TNF) were measured using immunoassays. Multivariate regression analyses showed significant associations between increased OPN and VCI groups, namely CIND with CeVD, AD with CeVD and VaD. Interestingly, higher OPN was also significantly associated with AD even in the absence of CeVD. We further showed that increased OPN significantly associated with neuroimaging markers of CeVD and neurodegeneration, including cortical infarcts, lacunes, white matter hyperintensities and brain atrophy. OPN also correlated with elevated levels of IL-6, IL-8 and TNF. Our findings suggest that OPN may play a role in both VCI and neurodegenerative dementias. Further longitudinal analyses are needed to assess the prognostic utility of OPN in disease prediction and monitoring.
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20
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Sørensen MD, Nielsen O, Reifenberger G, Kristensen BW. The presence of TIM-3 positive cells in WHO grade III and IV astrocytic gliomas correlates with isocitrate dehydrogenase mutation status. Brain Pathol 2021; 31:e12921. [PMID: 33244787 PMCID: PMC8412096 DOI: 10.1111/bpa.12921] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 11/23/2020] [Indexed: 12/23/2022] Open
Abstract
Diffuse gliomas are aggressive brain tumors that respond poorly to immunotherapy including immune checkpoint inhibition. This resistance may arise from an immunocompromised microenvironment and deficient immune recognition of tumor cells because of low mutational burden. The most prominent genetic alterations in diffuse glioma are mutations in the isocitrate dehydrogenase (IDH) genes that generate the immunosuppressive oncometabolite d-2-hydroxyglutarate. Our objective was to explore the association between IDH mutation and presence of cells expressing the immune checkpoint proteins galectin-9 and/or T cell immunoglobulin and mucin-domain containing-3 (TIM-3). Astrocytic gliomas of World Health Organization (WHO) grades III or IV (36 IDH-mutant and 36 IDH-wild-type) from 72 patients were included in this study. A novel multiplex chromogenic immunohistochemistry panel was applied using antibodies against galectin-9, TIM-3, and the oligodendrocyte transcription factor 2 (OLIG2). Validation studies were performed using data from The Cancer Genome Atlas (TCGA) project. IDH mutation was associated with decreased levels of TIM-3+ cells (p < 0.05). No significant association was found between galectin-9 and IDH status (p = 0.10). Most TIM-3+ and galectin-9+ cells resembled microglia/macrophages, and very few TIM-3+ and/or galectin-9+ cells co-expressed OLIG2. The percentage of TIM-3+ T cells was generally low, however, IDH-mutant tumors contained significantly fewer TIM-3+ T cells (p < 0.01) and had a lower interaction rate between TIM-3+ T cells and galectin-9+ microglia/macrophages (p < 0.05). TCGA data confirmed lower TIM-3 mRNA expression in IDH-mutant compared to IDH-wild-type astrocytic gliomas (p = 0.013). Our results show that IDH mutation is associated with diminished levels of TIM-3+ cells and fewer interactions between TIM-3+ T cells and galectin-9+ microglia/macrophages, suggesting reduced activity of the galectin-9/TIM-3 immune checkpoint pathway in IDH-mutant astrocytic gliomas.
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Affiliation(s)
- Mia D Sørensen
- Department of Pathology, Odense University Hospital, Odense, Denmark.,Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Ole Nielsen
- Department of Pathology, Odense University Hospital, Odense, Denmark
| | - Guido Reifenberger
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark.,Institute of Neuropathology, Heinrich Heine University, Düsseldorf, Germany.,German Cancer Consortium (DKT), partner site Essen/Düsseldorf, Essen, Germany
| | - Bjarne W Kristensen
- Department of Pathology, Odense University Hospital, Odense, Denmark.,Department of Clinical Research, University of Southern Denmark, Odense, Denmark.,Department of Pathology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.,Department of Clinical Medicine and Biotech Research and Innovation Center (BRIC), University of Copenhagen, Copenhagen, Denmark
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21
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Schlecht A, Zhang P, Wolf J, Thien A, Rosmus DD, Boneva S, Schlunck G, Lange C, Wieghofer P. Secreted Phosphoprotein 1 Expression in Retinal Mononuclear Phagocytes Links Murine to Human Choroidal Neovascularization. Front Cell Dev Biol 2021; 8:618598. [PMID: 33585455 PMCID: PMC7876283 DOI: 10.3389/fcell.2020.618598] [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: 10/17/2020] [Accepted: 12/01/2020] [Indexed: 01/08/2023] Open
Abstract
Age-related macular degeneration (AMD) represents the most common cause of blindness in the elderly in the Western world. An impairment of the outer blood-retina barrier and a localized inflammatory microenvironment cause sprouting of choroidal neovascular membranes (CNV) in neovascular AMD that are in intimate contact with surrounding myeloid cells, such as retinal microglia, and ultimately lead to visual impairment. The discovery of novel target molecules to interfere with angiogenesis and inflammation is vital for future treatment approaches in AMD patients. To explore the transcriptional profile and the function of retinal microglia at sites of CNV, we performed a comprehensive RNA-seq analysis of retinal microglia in the mouse model of laser-induced choroidal neovascularization (mCNV). Here, we identified the angiogenic factor Osteopontin (Opn), also known as "secreted phosphoprotein 1" (Spp1), as one of the most highly expressed genes in retinal microglia in the course of CNV formation. We confirmed the presence of SPP1 at the lesion site in recruited retinal microglia in Cx3cr1 CreER:Rosa26-tdTomato reporter mice by confocal microscopy and in whole retinal tissue lysates by ELISA highlighting a massive local production of SPP1. Inhibition of SPP1 by intravitreal injection of an anti-SPP1 antibody significantly increased the lesion size compared to IgG-treated control eyes. In line with our results in rodents, we found an increased SPP1 mRNA expression in surgically extracted human choroidal neovascular (hCNV) membranes by the quantitative RNA-seq approach of massive analysis of cDNA ends (MACE). Numerous IBA1+SPP1+ myeloid cells were detected in human CNV membranes. Taken together, these results highlight the importance of SPP1 in the formation of CNV and potentially offer new opportunities for therapeutic intervention by modulating the SPP1 pathway.
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Affiliation(s)
- Anja Schlecht
- Eye Center, Medical Center, Medical Faculty, University of Freiburg, Freiburg, Germany
| | - Peipei Zhang
- Eye Center, Medical Center, Medical Faculty, University of Freiburg, Freiburg, Germany
| | - Julian Wolf
- Eye Center, Medical Center, Medical Faculty, University of Freiburg, Freiburg, Germany
| | - Adrian Thien
- Eye Center, Medical Center, Medical Faculty, University of Freiburg, Freiburg, Germany
| | | | - Stefaniya Boneva
- Eye Center, Medical Center, Medical Faculty, University of Freiburg, Freiburg, Germany
| | - Günther Schlunck
- Eye Center, Medical Center, Medical Faculty, University of Freiburg, Freiburg, Germany
| | - Clemens Lange
- Eye Center, Medical Center, Medical Faculty, University of Freiburg, Freiburg, Germany
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22
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Kawai T, Takao K, Akter S, Abe M, Sakimura K, Miyakawa T, Okamura Y. Heterogeneity of microglial proton channel in different brain regions and its relationship with aging. J Neurochem 2021; 157:624-641. [PMID: 33404063 DOI: 10.1111/jnc.15292] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 12/24/2020] [Accepted: 12/26/2020] [Indexed: 12/13/2022]
Abstract
The properties of microglia largely differ depending on aging as well as on brain regions. However, there are few studies that investigated the functional importance of such heterogeneous properties of microglia at the molecular level. Voltage-gated proton channel, Hv1/VSOP, could be one of the candidates which confers functional heterogeneity among microglia since it regulates brain oxidative stress in age-dependent manner. In this study, we found that Hv1/VSOP shows brain region-dependent heterogeneity of gene expression with the highest level in the striatum. We studied the importance of Hv1/VSOP in two different brain regions, the cerebral cortex and striatum, and examined their relationship with aging (using mice of different ages). In the cortex, we observed the age-dependent impact of Hv1/VSOP on oxidative stress, microglial morphology, and gene expression profile. On the other hand, we found that the age-dependent significance of Hv1/VSOP was less obvious in the striatum than the cortex. Finally, we performed a battery of behavioral experiments on Hv1/VSOP-deficient mice both at young and aged stages to examine the effect of aging on Hv1/VSOP function. Hv1/VSOP-deficient mice specifically showed a marked difference in behavior in light/dark transition test only at aged stages, indicating that anxiety state is altered in aged Hv1/VSOP mice. This study suggests that a combination of brain region heterogeneity and animal aging underscores the functional importance of Hv1/VSOP in microglia.
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Affiliation(s)
- Takafumi Kawai
- Integrative Physiology, Graduate School of Medicine & Frontier Biosciences, Osaka University, Suita, Japan
| | - Keizo Takao
- Section of Behavior Patterns, Center for Genetic Analysis of Behavior, National Institute for Physiological Sciences, Okazaki, Japan.,Life Science Research Center, University of Toyama, Toyama, Japan
| | - Sharmin Akter
- Integrative Physiology, Graduate School of Medicine & Frontier Biosciences, Osaka University, Suita, Japan
| | - Manabu Abe
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Kenji Sakimura
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Tsuyoshi Miyakawa
- Section of Behavior Patterns, Center for Genetic Analysis of Behavior, National Institute for Physiological Sciences, Okazaki, Japan.,Division of Systems Medical Science, Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Japan
| | - Yasushi Okamura
- Integrative Physiology, Graduate School of Medicine & Frontier Biosciences, Osaka University, Suita, Japan.,Graduate School of Frontier Bioscience, Osaka University, Suita, Japan
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23
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Cappellano G, Vecchio D, Magistrelli L, Clemente N, Raineri D, Barbero Mazzucca C, Virgilio E, Dianzani U, Chiocchetti A, Comi C. The Yin-Yang of osteopontin in nervous system diseases: damage versus repair. Neural Regen Res 2021; 16:1131-1137. [PMID: 33269761 PMCID: PMC8224140 DOI: 10.4103/1673-5374.300328] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Osteopontin is a broadly expressed pleiotropic protein, and is attracting increased attention because of its role in the pathophysiology of several inflammatory, degenerative, autoimmune, and oncologic diseases. In fact, in the last decade, several studies have shown that osteopontin contributes to tissue damage not only by recruiting harmful inflammatory cells to the site of lesion, but also increasing their survival. The detrimental role of osteopontin has been indeed well documented in the context of different neurological conditions (i.e., multiple sclerosis, Parkinson's, and Alzheimer's diseases). Intriguingly, recent findings show that osteopontin is involved not only in promoting tissue damage (the Yin), but also in repair/regenerative mechanisms (the Yang), mostly triggered by the inflammatory response. These two apparently discordant roles are partly related to the presence of different functional domains in the osteopontin molecule, which are exposed after thrombin or metalloproteases cleavages. Such functional domains may in turn activate intracellular signaling pathways and mediate cell-cell and cell-matrix interactions. This review describes the current knowledge on the Yin and Yang features of osteopontin in nervous system diseases. Understanding the mechanisms behind the Yin/Yang would be relevant to develop highly specific tools targeting this multifunctional protein.
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Affiliation(s)
- Giuseppe Cappellano
- Department of Health Sciences, Interdisciplinary Research Center of Autoimmune Diseases (IRCAD); Center for Translational Research on Autoimmune and Allergic Disease-CAAD, University of Piemonte Orientale, Novara, Italy
| | - Domizia Vecchio
- Department of Translational Medicine, Neurology Unit, Interdisciplinary Research Center of Autoimmune Diseases (IRCAD), University of Piemonte Orientale, Novara, Italy
| | - Luca Magistrelli
- Department of Translational Medicine, Neurology Unit, Interdisciplinary Research Center of Autoimmune Diseases (IRCAD), University of Piemonte Orientale, Novara; PhD Program in Clinical and Experimental Medicine and Medical Humanities, University of Insubria, Varese, Italy
| | - Nausicaa Clemente
- Department of Health Sciences, Interdisciplinary Research Center of Autoimmune Diseases (IRCAD), University of Piemonte Orientale, Novara, Italy
| | - Davide Raineri
- Department of Health Sciences, Interdisciplinary Research Center of Autoimmune Diseases (IRCAD); Center for Translational Research on Autoimmune and Allergic Disease-CAAD, University of Piemonte Orientale, Novara, Italy
| | - Camilla Barbero Mazzucca
- Department of Health Sciences, Interdisciplinary Research Center of Autoimmune Diseases (IRCAD); Center for Translational Research on Autoimmune and Allergic Disease-CAAD, University of Piemonte Orientale, Novara, Italy
| | - Eleonora Virgilio
- Department of Translational Medicine, Neurology Unit, Interdisciplinary Research Center of Autoimmune Diseases (IRCAD), University of Piemonte Orientale, Novara, Italy
| | - Umberto Dianzani
- Department of Health Sciences, Interdisciplinary Research Center of Autoimmune Diseases (IRCAD); Center for Translational Research on Autoimmune and Allergic Disease-CAAD, University of Piemonte Orientale, Novara, Italy
| | - Annalisa Chiocchetti
- Department of Health Sciences, Interdisciplinary Research Center of Autoimmune Diseases (IRCAD); Center for Translational Research on Autoimmune and Allergic Disease-CAAD, University of Piemonte Orientale, Novara, Italy
| | - Cristoforo Comi
- Department of Translational Medicine, Neurology Unit, Interdisciplinary Research Center of Autoimmune Diseases (IRCAD), University of Piemonte Orientale, Novara, Italy
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24
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Blaschke SJ, Demir S, König A, Abraham JA, Vay SU, Rabenstein M, Olschewski DN, Hoffmann C, Hoffmann M, Hersch N, Merkel R, Hoffmann B, Schroeter M, Fink GR, Rueger MA. Substrate Elasticity Exerts Functional Effects on Primary Microglia. Front Cell Neurosci 2020; 14:590500. [PMID: 33250714 PMCID: PMC7674555 DOI: 10.3389/fncel.2020.590500] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Accepted: 10/12/2020] [Indexed: 12/11/2022] Open
Abstract
Microglia-the brain's primary immune cells-exert a tightly regulated cascade of pro- and anti-inflammatory effects upon brain pathology, either promoting regeneration or neurodegeneration. Therefore, harnessing microglia emerges as a potential therapeutic concept in neurological research. Recent studies suggest that-besides being affected by chemokines and cytokines-various cell entities in the brain relevantly respond to the mechanical properties of their microenvironment. For example, we lately reported considerable effects of elasticity on neural stem cells, regarding quiescence and differentiation potential. However, the effects of elasticity on microglia remain to be explored.Under the hypothesis that the elasticity of the microenvironment affects key characteristics and functions of microglia, we established an in vitro model of primary rat microglia grown in a polydimethylsiloxane (PDMS) elastomer-based cell culture system. This way, we simulated the brain's physiological elasticity range and compared it to supraphysiological stiffer PDMS controls. We assessed functional parameters of microglia under "resting" conditions, as well as when polarized towards a pro-inflammatory phenotype (M1) by lipopolysaccharide (LPS), or an anti-inflammatory phenotype (M2) by interleukin-4 (IL-4). Microglia viability was unimpaired on soft substrates, but we found various significant effects with a more than two-fold increase in microglia proliferation on soft substrate elasticities mimicking the brain (relative to PDMS controls). Furthermore, soft substrates promoted the expression of the activation marker vimentin in microglia. Moreover, the M2-marker CD206 was upregulated in parallel to an increase in the secretion of Insulin-Like Growth Factor-1 (IGF-1). The upregulation of CD206 was abolished by blockage of stretch-dependent chloride channels. Our data suggest that the cultivation of microglia on substrates of brain-like elasticity promotes a basic anti-inflammatory activation state via stretch-dependent chloride channels. The results highlight the significance of the omnipresent but mostly overlooked mechanobiological effects exerted on microglia and contribute to a better understanding of the complex spatial and temporal interactions between microglia, neural stem cells, and glia, in health and disease.
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Affiliation(s)
- Stefan J Blaschke
- Department of Neurology, Faculty of Medicine and University Hospital, The University of Cologne, Cologne, Germany.,Department of Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany
| | - Seda Demir
- Department of Neurology, Faculty of Medicine and University Hospital, The University of Cologne, Cologne, Germany
| | - Anna König
- Department of Neurology, Faculty of Medicine and University Hospital, The University of Cologne, Cologne, Germany
| | - Jella-Andrea Abraham
- Department of Neurology, Faculty of Medicine and University Hospital, The University of Cologne, Cologne, Germany.,Department of Mechanobiology, Institute of Biological Information Processing (IBI-2), Research Centre Jülich, Jülich, Germany
| | - Sabine U Vay
- Department of Neurology, Faculty of Medicine and University Hospital, The University of Cologne, Cologne, Germany
| | - Monika Rabenstein
- Department of Neurology, Faculty of Medicine and University Hospital, The University of Cologne, Cologne, Germany
| | - Daniel N Olschewski
- Department of Neurology, Faculty of Medicine and University Hospital, The University of Cologne, Cologne, Germany
| | - Christina Hoffmann
- Department of Mechanobiology, Institute of Biological Information Processing (IBI-2), Research Centre Jülich, Jülich, Germany
| | - Marco Hoffmann
- Department of Mechanobiology, Institute of Biological Information Processing (IBI-2), Research Centre Jülich, Jülich, Germany
| | - Nils Hersch
- Department of Mechanobiology, Institute of Biological Information Processing (IBI-2), Research Centre Jülich, Jülich, Germany
| | - Rudolf Merkel
- Department of Mechanobiology, Institute of Biological Information Processing (IBI-2), Research Centre Jülich, Jülich, Germany
| | - Bernd Hoffmann
- Department of Mechanobiology, Institute of Biological Information Processing (IBI-2), Research Centre Jülich, Jülich, Germany
| | - Michael Schroeter
- Department of Neurology, Faculty of Medicine and University Hospital, The University of Cologne, Cologne, Germany
| | - Gereon R Fink
- Department of Neurology, Faculty of Medicine and University Hospital, The University of Cologne, Cologne, Germany.,Department of Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany
| | - Maria A Rueger
- Department of Neurology, Faculty of Medicine and University Hospital, The University of Cologne, Cologne, Germany.,Department of Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany
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25
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Recombinant osteopontin provides protection for cerebral infarction by inhibiting the NLRP3 inflammasome in microglia. Brain Res 2020; 1751:147170. [PMID: 33157099 DOI: 10.1016/j.brainres.2020.147170] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 10/16/2020] [Accepted: 10/17/2020] [Indexed: 12/25/2022]
Abstract
Neuroinflammation is one of the most important secondary pathological events after cerebral infarction. Activation of NLRP3 inflammasome is a pivotal form of neuroinflammation. Osteopontin (OPN) is expressed during the subacute phase after cerebral infarction and has an important chemotactic effect on microglia. The aim of this study was to reveal the effect of recombinant OPN on brain injury after cerebral infarction and the regulation of NLRP3 inflammasome. We used the middle cerebral artery occlusion (MCAO) method-established focal cerebral ischemia model and LPS-induced inflammation model on neonate rat primary microglia. The effects of OPN on cerebral ischemic injury, neural function, microglia inflammation and NLRP3 inflammasome function were studied by immunofluorescence, staining, enzyme-linked immunosorbent assay and Western blot assay. We established MCAO cerebral ischemia and reperfusion injury model, and found that recombinant OPN reduced the volume of cerebral infarction and alleviated the ischemic injury degree of cerebral tissues, neurons, and neurological function. We found that OPN was also involved in the negative regulation of inflammasome and microglia activity in cerebral ischemic injury, and that OPN inhibited the activation of NLRP3 inflammasome and the function of microglia in a LPS-induced inflammatory model. Our findings show that recombinant OPN can reduce the ischemic infarct size and alleviate the cerebral ischemic injury of rats, which may be related to its efficient involvement in the inhibitory regulation of inflammasome and microglia inflammatory activation.
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26
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Moschetta D, Di Minno MND, Porro B, Perrucci GL, Valerio V, Alfieri V, Massaiu I, Orekhov AN, Di Minno A, Songia P, Cavalca V, Myasoedova VA, Poggio P. Relationship Between Plasma Osteopontin and Arginine Pathway Metabolites in Patients With Overt Coronary Artery Disease. Front Physiol 2020; 11:982. [PMID: 32848891 PMCID: PMC7424048 DOI: 10.3389/fphys.2020.00982] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 07/20/2020] [Indexed: 11/13/2022] Open
Abstract
Introduction Osteopontin (OPN) is involved in ectopic calcification. Its circulating form is upregulated in coronary artery disease (CAD) patients. Circulating OPN levels positively correlate with oxidative stress, one of the major triggers of endothelial dysfunction. Endothelial dysfunction is, in turn, associated with reduced nitric oxide (NO) bioavailability due to the impaired arginine pathway. The aim of this study was to better understand the correlations between OPN, oxidative stress markers, and the arginine pathway metabolites. Methods and Results ELISA and mass spectrometry techniques have been used to evaluate circulating OPN and arginine pathway/oxidative stress metabolites, respectively, in twenty-five control subjects and thirty-three patients with overt atherosclerosis. OPN positively correlates with 2,3-dinor-8isoPGF2a levels (p = 0.02), ornithine (p = 0.01), ADMA (p = 0.001), SDMA (p = 0.03), and citrulline (p = 0.008) levels only in CAD patients. In addition, citrulline positively correlated with ADMA (p = 0.02) levels, possibly as result of other sources of citrulline biosynthetic pathways. Conclusion The association between OPN and impaired arginine/NO pathway could play a role in the inhibition of endothelial NO synthase (eNOS) and/or in the arginase activation in the context of CAD patients. However, further studies are needed to verify the cause-effect relationship between OPN, oxidative stress, and arginine/NO pathway dysregulation.
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Affiliation(s)
- Donato Moschetta
- Unità per lo Studio delle Patologie Aortiche, Valvolari e Coronariche, Centro Cardiologico Monzino IRCCS, Milan, Italy.,Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy
| | | | - Benedetta Porro
- Unità di Metabolomica, Centro Cardiologico Monzino IRCCS, Milan, Italy
| | - Gianluca L Perrucci
- Unità di Medicina Rigenerativa e Biologia Vascolare, Centro Cardiologico Monzino IRCCS, Milan, Italy
| | - Vincenza Valerio
- Unità per lo Studio delle Patologie Aortiche, Valvolari e Coronariche, Centro Cardiologico Monzino IRCCS, Milan, Italy.,Dipartimento di Medicina Clinica e Chirurgia, Università degli Studi di Napoli Federico II, Naples, Italy
| | - Valentina Alfieri
- Unità per lo Studio delle Patologie Aortiche, Valvolari e Coronariche, Centro Cardiologico Monzino IRCCS, Milan, Italy
| | - Ilaria Massaiu
- Unità per lo Studio delle Patologie Aortiche, Valvolari e Coronariche, Centro Cardiologico Monzino IRCCS, Milan, Italy
| | - Alexander N Orekhov
- Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Alessandro Di Minno
- Dipartimento di Farmacia, Università degli Studi di Napoli Federico II, Naples, Italy
| | - Paola Songia
- Unità per lo Studio delle Patologie Aortiche, Valvolari e Coronariche, Centro Cardiologico Monzino IRCCS, Milan, Italy
| | - Viviana Cavalca
- Unità di Metabolomica, Centro Cardiologico Monzino IRCCS, Milan, Italy
| | - Veronika A Myasoedova
- Unità per lo Studio delle Patologie Aortiche, Valvolari e Coronariche, Centro Cardiologico Monzino IRCCS, Milan, Italy
| | - Paolo Poggio
- Unità per lo Studio delle Patologie Aortiche, Valvolari e Coronariche, Centro Cardiologico Monzino IRCCS, Milan, Italy
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27
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The Role of Osteopontin in Amyotrophic Lateral Sclerosis: A Systematic Review. ARCHIVES OF NEUROSCIENCE 2020. [DOI: 10.5812/ans.94205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Context: Osteopontin (OPN) is a matrix phosphoprotein expressed by a variety of tissues and cells, including the immune system and the nervous system. Previous studies have shown that OPN may have a role in neurodegenerative diseases, including multiple sclerosis, Parkinson’s disease, and Alzheimer’s disease. Objectives: The present study aimed to systematically review studies investigating the role of OPN in amyotrophic lateral sclerosis (ALS) patients or the disease animal model. Evidence Acquisition: We searched the Cochrane Library, PubMed, Web of Science, and Scopus to find relevant articles published up to January 20, 2019. Both human and animal model studies of ALS were considered. Results: A total of nine articles (four human studies and five animal model studies) were included. Two of the human studies reported that the CSF levels of OPN were higher among ALS patients compared to controls. The other two human studies found that OPN levels in cortical neurons did not differ significantly between ALS cases and the non-neurological control group. One of the studies found that the expression level of OPN in astrocytes was similar between ALS patients and the control group, but the level of microglial OPN significantly increased in ALS cases. Four of the animal model studies reported that the expression of OPN mRNA in spinal cord microglia significantly increased during the disease progression. The remaining animal model study found that OPN was selectively expressed by fast fatigue-resistant and slow motor neurons (MNs), which are resistant to ALS, and that the OPN expression was low among fast-fatigable MNs. Conclusions: Prompt microglial activation is a hallmark pathology of ALS, and OPN is among the most widely expressed proteins by these activated glial cells. Therefore, OPN might have a role in ALS pathogenesis. The existing evidence is not sufficient to justify whether OPN has a neurotoxic or neuroprotective role in ALS. We encourage researchers to investigate the role of OPN in ALS pathogenesis more extensively.
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28
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Ratliff WA, Qubty D, Delic V, Pick CG, Citron BA. Repetitive Mild Traumatic Brain Injury and Transcription Factor Modulation. J Neurotrauma 2020; 37:1910-1917. [PMID: 32292111 DOI: 10.1089/neu.2020.7005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The worldwide incidence of traumatic brain injury (TBI) is ∼0.5% per year and the frequency is significantly higher among military personnel and athletes. Repetitive TBIs are associated with military and athletic activities, and typically involve more severe consequences. The majority of TBIs are mild; however, these still can result in long-term cognitive deficits, and there is currently no effective treatment. tert-Butylhydroquinone (tBHQ) and pioglitazone can activate the nuclear factor (erythroid-derived 2)-like 2 (Nrf2) and peroxisome proliferator-activated receptor-gamma (PPAR-γ) transcription factors, respectively, and each has been shown to be neuroprotective in various model systems. We examined behavioral and gene expression changes after repetitive mild TBI followed by simultaneous treatment with both factors. We used a repetitive closed head injury of mice involving five injuries with a 1-week interval between each TBI. We found that memory performance was significantly reduced by the injuries, unless the TBIs were followed by the tBHQ and pioglitazone administrations. Certain genes; for example, growth hormone and osteopontin, were downregulated by the injury, and this was reversed by the treatment, whereas other genes; for example, a tumor necrosis factor receptor, were upregulated by the injury and restored if the post-injury treatment was administered. Analysis of gene expression levels affected by the injury and/or the treatment point to potential mechanisms that could be exploited therapeutically.
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Affiliation(s)
- Whitney A Ratliff
- Laboratory of Molecular Biology, Bay Pines VA Healthcare System, Research and Development, Bay Pines, Florida, USA
| | - Doaa Qubty
- Department of Anatomy and Anthropology, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Vedad Delic
- Laboratory of Molecular Biology, VA New Jersey Health Care System, Research and Development, East Orange, New Jersey, USA
| | - Chaim G Pick
- Department of Anatomy and Anthropology, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.,Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel.,Dr. Miriam and Sheldon G. Adelson Chair and Center for the Biology of Addictive Diseases, Tel Aviv University, Tel Aviv, Israel
| | - Bruce A Citron
- Laboratory of Molecular Biology, Bay Pines VA Healthcare System, Research and Development, Bay Pines, Florida, USA.,Laboratory of Molecular Biology, VA New Jersey Health Care System, Research and Development, East Orange, New Jersey, USA.,Department of Pharmacology, Physiology, and Neuroscience, Rutgers-New Jersey Medical School, Newark, New Jersey, USA
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29
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Vay SU, Flitsch LJ, Rabenstein M, Monière H, Jakovcevski I, Andjus P, Bijelic D, Blaschke S, Walter HL, Fink GR, Schroeter M, Rueger MA. The impact of hyperpolarization-activated cyclic nucleotide-gated (HCN) and voltage-gated potassium KCNQ/Kv7 channels on primary microglia function. J Neuroinflammation 2020; 17:100. [PMID: 32248813 PMCID: PMC7132998 DOI: 10.1186/s12974-020-01779-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Accepted: 03/18/2020] [Indexed: 01/03/2023] Open
Abstract
Background Microglia are essential to maintain cell homeostasis in the healthy brain and are activated after brain injury. Upon activation, microglia polarize towards different phenotypes. The course of microglia activation is complex and depends on signals in the surrounding milieu. Recently, it has been suggested that microglia respond to ion currents, as a way of regulating their activity and function. Methods and results Under the hypothesis that HCN and KCNQ/Kv7 channels impact on microglia, we studied primary rat microglia in the presence or absence of specific pharmacological blockade or RNA silencing. Primary microglia expressed the subunits HCN1-4, Kv7.2, Kv7.3, and Kv7.5. The expression of HCN2, as well as Kv7.2 and Kv7.3, varied among different microglia phenotypes. The pharmacological blockade of HCN channels by ZD7288 resulted in cell depolarization with slowly rising intracellular calcium levels, leading to enhanced survival and reduced proliferation rates of resting microglia. Furthermore, ZD7288 treatment, as well as knockdown of HCN2 RNA by small interfering RNA, resulted in an attenuation of later microglia activation—both towards the anti- and pro-inflammatory phenotype. However, HCN channel inhibition enhanced the phagocytic capacity of IL4-stimulated microglia. Blockade of Kv7/KCNQ channel by XE-991 exclusively inhibited the migratory capacity of resting microglia. Conclusion These observations suggest that the HCN current contributes to various microglia functions and impacts on the course of microglia activation, while the Kv7/KCNQ channels affect microglia migration. Characterizing the role of HCN channels in microglial functioning may offer new therapeutic approaches for targeted modulation of neuroinflammation as a hallmark of various neurological disorders.
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Affiliation(s)
- Sabine Ulrike Vay
- Department of Neurology, Faculty of Medicine and University Hospital, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.
| | - Lea Jessica Flitsch
- Department of Neurology, Faculty of Medicine and University Hospital, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Monika Rabenstein
- Department of Neurology, Faculty of Medicine and University Hospital, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Helena Monière
- Department of Neurology, Faculty of Medicine and University Hospital, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Igor Jakovcevski
- Institute for Molecular and Behavioural Neuroscience and Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany
| | - Pavle Andjus
- Center for Laser Microscopy-CLM, Faculty of Biology, University of Belgrade, Belgrade, Serbia
| | - Dunja Bijelic
- Center for Laser Microscopy-CLM, Faculty of Biology, University of Belgrade, Belgrade, Serbia
| | - Stefan Blaschke
- Department of Neurology, Faculty of Medicine and University Hospital, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Helene Luise Walter
- Department of Neurology, Faculty of Medicine and University Hospital, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Gereon Rudolf Fink
- Department of Neurology, Faculty of Medicine and University Hospital, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Michael Schroeter
- Department of Neurology, Faculty of Medicine and University Hospital, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Maria Adele Rueger
- Department of Neurology, Faculty of Medicine and University Hospital, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
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30
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Rabenstein M, Vay SU, Blaschke S, Walter HL, Ladwig A, Fink GR, Rueger MA, Schroeter M. Crosstalk between stressed brain cells: direct and indirect effects of ischemia and aglycemia on microglia. J Neuroinflammation 2020; 17:33. [PMID: 31980036 PMCID: PMC6982395 DOI: 10.1186/s12974-020-1697-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 01/02/2020] [Indexed: 12/17/2022] Open
Abstract
Background In cerebral ischemia, microglia have a dichotomous role in keeping the balance between pro- and anti-inflammatory mediators to avoid deleterious chronic inflammation and to leverage repair processes. Methods We examined functional and inflammatory markers in primary rat microglia in vitro after oxygen-glucose deprivation (OGD) or glucose deprivation (aglycemia). We then investigated the preconditioning effect of OGD or aglycemia upon a subsequent strong inflammatory stimulus, here lipopolysaccharides (LPS). Moreover, an “in vitro brain model” of neurons and glia, differentiated from primary rat neural stem cells, was exposed to OGD or aglycemia. Conditioned medium (CM) of this neuronal/glial co-culture was then used to condition microglia, followed by LPS as a “second hit.” Results OGD or aglycemia at sublethal doses did not significantly affect microglia function, including the expression of inflammatory markers. However, preconditioning with either OGD or aglycemia led to a decreased pro-inflammatory response to a subsequent stimulus with LPS. Interestingly, the anti-inflammatory markers IGF-1 and IL-10 were additionally reduced after such preconditioning, while expression of CD206 remained unaffected. Treatment with CM from the neuronal/glial co-culture alone did not affect the expression of inflammatory markers in microglia. In contrast, treatment with CM increased the expression of both pro- and anti-inflammatory markers in microglia upon a second hit with LPS. Interestingly, this effect could be attenuated in microglia treated with CM from neuronal/glia co-cultures preconditioned with OGD or aglycemia. Conclusions Data suggest specific and distinct microglia signatures in response to metabolic stress. While metabolic stress directly and indirectly applied to microglia did not mitigate their subsequent response to inflammation, preconditioning with metabolic stress factors such as OGD and aglycemia elicited a decreased inflammatory response to a subsequent inflammation stimulus.
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Affiliation(s)
- Monika Rabenstein
- Department of Neurology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Sabine Ulrike Vay
- Department of Neurology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Stefan Blaschke
- Department of Neurology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Research Centre Juelich, Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Juelich, Germany
| | - Helene Luise Walter
- Department of Neurology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Anne Ladwig
- Department of Neurology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Gereon Rudolf Fink
- Department of Neurology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Research Centre Juelich, Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Juelich, Germany
| | - Maria Adele Rueger
- Department of Neurology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Research Centre Juelich, Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Juelich, Germany
| | - Michael Schroeter
- Department of Neurology, Faculty of Medicine and University Hospital, University of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany. .,Research Centre Juelich, Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Juelich, Germany.
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31
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Rabenstein M, Unverricht-Yeboah M, Keuters MH, Pikhovych A, Hucklenbroich J, Vay SU, Blaschke S, Ladwig A, Walter HL, Beiderbeck M, Fink GR, Schroeter M, Kriehuber R, Rueger MA. Transcranial Current Stimulation Alters the Expression of Immune-Mediating Genes. Front Cell Neurosci 2019; 13:461. [PMID: 31708742 PMCID: PMC6824260 DOI: 10.3389/fncel.2019.00461] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 09/27/2019] [Indexed: 11/13/2022] Open
Abstract
Despite its extensive use in clinical studies, the molecular mechanisms underlying the effects of transcranial direct current stimulation (tDCS) remain to be elucidated. We previously described subacute effects of tDCS on immune- and stem cells in the rat brain. To investigate the more immediate effects of tDCS regulating those cellular responses, we treated rats with a single session of either anodal or cathodal tDCS, and analyzed the gene expression by microarray; sham-stimulated rats served as control. Anodal tDCS increased expression of several genes coding for the major histocompatibility complex I (MHC I), while cathodal tDCS increased the expression of the immunoregulatory protein osteopontin (OPN). We confirmed the effects of gene upregulation by immunohistochemistry at the protein level. Thus, our data show a novel mechanism for the actions of tDCS on immune- and inflammatory processes, providing a target for future therapeutic studies.
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Affiliation(s)
- Monika Rabenstein
- Department of Neurology, University Hospital of Cologne, Cologne, Germany
| | - Marcus Unverricht-Yeboah
- Radiation Biology Unit, Department of Safety and Radiation Protection, Research Centre Jülich, Jülich, Germany
| | - Meike Hedwig Keuters
- Department of Neurology, University Hospital of Cologne, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany.,A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Anton Pikhovych
- Department of Neurology, University Hospital of Cologne, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany
| | - Joerg Hucklenbroich
- Department of Neurology, University Hospital of Cologne, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany
| | - Sabine Ulrike Vay
- Department of Neurology, University Hospital of Cologne, Cologne, Germany
| | - Stefan Blaschke
- Department of Neurology, University Hospital of Cologne, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany
| | - Anne Ladwig
- Department of Neurology, University Hospital of Cologne, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany
| | | | | | - Gereon Rudolf Fink
- Department of Neurology, University Hospital of Cologne, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany
| | - Michael Schroeter
- Department of Neurology, University Hospital of Cologne, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany
| | - Ralf Kriehuber
- Radiation Biology Unit, Department of Safety and Radiation Protection, Research Centre Jülich, Jülich, Germany
| | - Maria Adele Rueger
- Department of Neurology, University Hospital of Cologne, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Jülich, Jülich, Germany
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Elevated TREM2 Gene Dosage Reprograms Microglia Responsivity and Ameliorates Pathological Phenotypes in Alzheimer's Disease Models. Neuron 2019. [PMID: 29518357 DOI: 10.1016/j.neuron.2018.02.002] [Citation(s) in RCA: 212] [Impact Index Per Article: 42.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Variants of TREM2 are associated with Alzheimer's disease (AD). To study whether increasing TREM2 gene dosage could modify the disease pathogenesis, we developed BAC transgenic mice expressing human TREM2 (BAC-TREM2) in microglia. We found that elevated TREM2 expression reduced amyloid burden in the 5xFAD mouse model. Transcriptomic profiling demonstrated that increasing TREM2 levels conferred a rescuing effect, which includes dampening the expression of multiple disease-associated microglial genes and augmenting downregulated neuronal genes. Interestingly, 5xFAD/BAC-TREM2 mice showed further upregulation of several reactive microglial genes linked to phagocytosis and negative regulation of immune cell activation. Moreover, these mice showed enhanced process ramification and phagocytic marker expression in plaque-associated microglia and reduced neuritic dystrophy. Finally, elevated TREM2 gene dosage led to improved memory performance in AD models. In summary, our study shows that a genomic transgene-driven increase in TREM2 expression reprograms microglia responsivity and ameliorates neuropathological and behavioral deficits in AD mouse models.
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Riew TR, Kim S, Jin X, Kim HL, Lee JH, Lee MY. Osteopontin and its spatiotemporal relationship with glial cells in the striatum of rats treated with mitochondrial toxin 3-nitropropionic acid: possible involvement in phagocytosis. J Neuroinflammation 2019; 16:99. [PMID: 31088570 PMCID: PMC6518780 DOI: 10.1186/s12974-019-1489-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 04/25/2019] [Indexed: 12/16/2022] Open
Abstract
Background Osteopontin (OPN, SPP1) is upregulated in response to acute brain injury, and based on its immunoreactivity, two distinct forms have been identified: intracellular OPN within brain macrophages and small granular OPN, identified as OPN-coated degenerated neurites. This study investigates the spatiotemporal relationship between punctate OPN deposition and astroglial and microglial reactions elicited by 3-nitropropionic acid (3-NP). Methods Male Sprague-Dawley rats were intraperitoneally injected with mitochondrial toxin 3-NP and euthanized at 3, 7, 14, and 28 days. Quantitative and qualitative light and electron microscopic techniques were used to assess the relationship between OPN and glial cells. Statistical significance was determined by Student’s t test or a one-way analysis of variance followed by Tukey’s multiple comparisons test. Results Punctate OPN-immunoreactive profiles were synthesized and secreted by amoeboid-like brain macrophages in the lesion core, but not by reactive astrocytes and activated microglia with a stellate shape in the peri-lesional area. Punctate OPN accumulation was detected only in the lesion core away from reactive astrocytes in the peri-lesional area at day 3, but had direct contact with, and even overlapped with astroglial processes at day 7. The distance between the OPN-positive area and the astrocytic scar significantly decreased from days 3 to 7. By days 14 and 28 post-lesion, when the glial scar was fully formed, punctate OPN distribution mostly overlapped with the astrocytic scar. Three-dimensional reconstructions and quantitative image analysis revealed numerous granular OPN puncta inside the cytoplasm of reactive astrocytes and brain macrophages. Reactive astrocytes showed prominent expression of the lysosomal marker lysosomal-associated membrane protein 1, and ultrastructural analysis confirmed OPN-coated degenerating neurites inside astrocytes, suggesting the phagocytosis of OPN puncta by reactive astrocytes after injury. Conclusions Punctate OPN-immunoreactive profiles corresponded to OPN-coated degenerated neurites, which were closely associated with, or completely engulfed by, the reactive astrocytes forming the astroglial scar in 3-NP lesioned striatum, suggesting that OPN may cause astrocytes to migrate towards these degenerated neurites in the lesion core to establish physical contact with, and possibly, to phagocytose them. Our results provide novel insights essential to understanding the recovery and repair of the central nervous system tissue. Electronic supplementary material The online version of this article (10.1186/s12974-019-1489-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Tae-Ryong Riew
- Department of Anatomy, Catholic Neuroscience Institute, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seoul, 06591, Republic of Korea
| | - Soojin Kim
- Department of Anatomy, Catholic Neuroscience Institute, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seoul, 06591, Republic of Korea
| | - Xuyan Jin
- Department of Anatomy, Catholic Neuroscience Institute, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seoul, 06591, Republic of Korea.,Department of Biomedicine and Health Sciences, College of Medicine, The Catholic University of Korea, Seoul, 06591, Republic of Korea
| | - Hong Lim Kim
- Integrative Research Support Center, Laboratory of Electron Microscope, College of Medicine, The Catholic University of Korea, Seoul, 06591, Republic of Korea
| | - Jeong-Hwa Lee
- Department of Biochemistry, College of Medicine, The Catholic University of Korea, Seoul, 06591, Republic of Korea.,The Institute for Aging and Metabolic Diseases, College of Medicine, The Catholic University of Korea, Seoul, 06591, Republic of Korea
| | - Mun-Yong Lee
- Department of Anatomy, Catholic Neuroscience Institute, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seoul, 06591, Republic of Korea. .,Department of Biomedicine and Health Sciences, College of Medicine, The Catholic University of Korea, Seoul, 06591, Republic of Korea.
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Kovács MÁ, Tényi T, Kugyelka R, Prenek L, Hau L, Magyar ÉE, Herold R, Balogh P, Simon D. Elevated Osteopontin and Interferon Gamma Serum Levels and Increased Neutrophil-to-Lymphocyte Ratio Are Associated With the Severity of Symptoms in Schizophrenia. Front Psychiatry 2019; 10:996. [PMID: 32038330 PMCID: PMC6989480 DOI: 10.3389/fpsyt.2019.00996] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 12/17/2019] [Indexed: 12/13/2022] Open
Abstract
Inflammation and immune dysregulation could contribute to the pathogenesis of schizophrenia. Osteopontin (OPN) is a cytokine-like glycoprotein involved in inflammation and in modulating immune responses, and it can also directly modify the cytokine expression and survival of microglia. Furthermore, elevated gene expression of OPN in first episode psychosis has recently been described, but to date OPN level has not been investigated in schizophrenia. Imbalance of T-helper subtypes could also represent a vulnerability factor for schizophrenia. In this study, we analyzed the concentration of OPN, levels of cytokines associated with T-helper subtypes: interferon gamma (IFNy) for Th1, interleukin (IL)-10 for Th2, IL-8 for Th17, and neutrophil-to-lymphocyte ratio (NLR) in 22 patients with schizophrenia assessed for the intensity of their symptoms by the Positive and Negative Syndrome Scale (PANSS) and Clinical Global Impression scale (CGI) scores. Serum OPN, IFNy, IL-10, and IL-8 concentrations were measured by ELISA kits and NLR was calculated from blood count. We found significant correlation between the level of OPN and PANSS-total and PANSS-general scores. IFNy level and NLR showed significant correlation with PANSS-total, PANSS-positive, PANSS-general, and CGI score. Among the measured markers antipsychotic therapy only had significant effects on NLR and OPN level, both of which were significantly reduced after long-term antipsychotic treatment. Our results indicate that elevated OPN and IFNy concentrations, and increased NLR are associated with severe symptoms in schizophrenia and suggest the importance of Th1 subtype in patients with high PANSS-positive and PANSS-general subscore. Significant correlation between NLR and PANSS scores strengthens the inflammation hypothesis of schizophrenia.
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Affiliation(s)
- Márton Áron Kovács
- Department of Psychiatry and Psychotherapy, Clinical Center, University of Pécs Medical School, Pécs, Hungary.,Department of Immunology and Biotechnology, Clinical Center, University of Pécs Medical School, Pécs, Hungary
| | - Tamás Tényi
- Department of Psychiatry and Psychotherapy, Clinical Center, University of Pécs Medical School, Pécs, Hungary
| | - Réka Kugyelka
- Department of Immunology and Biotechnology, Clinical Center, University of Pécs Medical School, Pécs, Hungary
| | - Lilla Prenek
- Department of Immunology and Biotechnology, Clinical Center, University of Pécs Medical School, Pécs, Hungary
| | - Lídia Hau
- Department of Psychiatry and Psychotherapy, Clinical Center, University of Pécs Medical School, Pécs, Hungary
| | - Éva Erzsébet Magyar
- Department of Psychiatry and Psychotherapy, Clinical Center, University of Pécs Medical School, Pécs, Hungary
| | - Róbert Herold
- Department of Psychiatry and Psychotherapy, Clinical Center, University of Pécs Medical School, Pécs, Hungary
| | - Péter Balogh
- Department of Immunology and Biotechnology, Clinical Center, University of Pécs Medical School, Pécs, Hungary
| | - Diána Simon
- Department of Immunology and Biotechnology, Clinical Center, University of Pécs Medical School, Pécs, Hungary
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35
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Gimba E, Brum M, Nestal De Moraes G. Full-length osteopontin and its splice variants as modulators of chemoresistance and radioresistance (Review). Int J Oncol 2018; 54:420-430. [DOI: 10.3892/ijo.2018.4656] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 10/25/2018] [Indexed: 11/06/2022] Open
Affiliation(s)
- Etel Gimba
- Program of Cellular and Molecular Oncobiology, National Cancer Institute, Rio de Janeiro 20231-050, Brazil
| | - Mariana Brum
- Program of Cellular and Molecular Oncobiology, National Cancer Institute, Rio de Janeiro 20231-050, Brazil
| | - Gabriela Nestal De Moraes
- Cellular and Molecular Hemato-Oncology Laboratory, Molecular Hemato-Oncology Program, National Cancer Institute, Rio de Janeiro 20230-130, Brazil
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Ladwig A, Rogall R, Hucklenbroich J, Willuweit A, Schoeneck M, Langen KJ, Fink GR, Rueger MA, Schroeter M. Osteopontin Attenuates Secondary Neurodegeneration in the Thalamus after Experimental Stroke. J Neuroimmune Pharmacol 2018; 14:295-311. [PMID: 30488353 DOI: 10.1007/s11481-018-9826-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 11/21/2018] [Indexed: 12/28/2022]
Abstract
Cortical cerebral ischemia elicits neuroinflammation as well as secondary neuronal degeneration in remote areas. Locally distinct and specific secondary neurodegeneration affecting thalamic nuclei connected to cortical areas highlights such processes. Osteopontin (OPN) is a cytokine-like glycoprotein that is excreted in high amounts after cerebral ischemia and exerts various immunomodulatory functions. We here examined putative protective effects of OPN in secondary thalamic degeneration. We subjected male Wistar rats to photothrombosis and subsequently injected OPN or placebo intracerebroventricularly. Immunohistochemical and fluorescence staining was used to detect the extent of neuronal degeneration and microglia activation. Ex vivo autoradiography with radiotracers available for human in vivo PET studies, i.e., CIS-4-[18F]Fluor-D-Proline (D-cis-[18F]FPRO), and [6-3H]thymidine ([3H]thymidine), confirmed degeneration and proliferation, respectively. We found secondary neurodegeneration in the thalamus characterized by microglial activation and neuronal loss. Neuronal loss was restricted to areas of microglial infiltration. Treatment with OPN significantly decreased neurodegeneration, inflammation and microglial proliferation. Microglia displayed morphological signs of activation without expressing markers of M1 or M2 polarization. D-CIS-[18F]FPRO-uptake mirrored attenuated degeneration in OPN-treated animals. Notably, [3H]thymidine and BrdU-staining revealed increased stem cell proliferation after treatment with OPN. The data suggest that OPN is able to ameliorate secondary neurodegeneration in thalamic nuclei. These effects can be visualized by radiotracers D-CIS-[18F]FPRO and [3H]thymidine, opening new vistas for translational studies. Graphical Abstract Intracerebroventricular injection of osteopontin attenuates thalamic degeneration after cortical ischemia (pink area). Disruption of thalamocortical connections (blue) and degeneration of thalamic nuclei (encircled) leads to microglia activation. Osteopontin protects from both neurodegeneration and microglia activation as assessed by histological analysis and autoradiograpic studies.
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Affiliation(s)
- Anne Ladwig
- Department of Neurology, University Hospital Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Rebecca Rogall
- Department of Neurology, University Hospital Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Jörg Hucklenbroich
- Department of Neurology, University Hospital Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | | | | | | | - Gereon R Fink
- Department of Neurology, University Hospital Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,INM-3, Research Centre Juelich, Juelich, Germany
| | - M Adele Rueger
- Department of Neurology, University Hospital Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,INM-3, Research Centre Juelich, Juelich, Germany
| | - Michael Schroeter
- Department of Neurology, University Hospital Cologne, Kerpener Strasse 62, 50924, Cologne, Germany. .,INM-3, Research Centre Juelich, Juelich, Germany.
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37
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Vay SU, Flitsch LJ, Rabenstein M, Rogall R, Blaschke S, Kleinhaus J, Reinert N, Bach A, Fink GR, Schroeter M, Rueger MA. The plasticity of primary microglia and their multifaceted effects on endogenous neural stem cells in vitro and in vivo. J Neuroinflammation 2018; 15:226. [PMID: 30103769 PMCID: PMC6090672 DOI: 10.1186/s12974-018-1261-y] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 07/27/2018] [Indexed: 02/07/2023] Open
Abstract
Background Microglia—the resident immune cells of the brain—are activated after brain lesions, e.g., cerebral ischemia, and polarize towards a classic “M1” pro-inflammatory or an alternative “M2” anti-inflammatory phenotype following characteristic temporo-spatial patterns, contributing either to secondary tissue damage or to regenerative responses. They closely interact with endogenous neural stem cells (NSCs) residing in distinct niches of the adult brain. The current study aimed at elucidating the dynamics of microglia polarization and their differential effects on NSC function. Results Primary rat microglia in vitro were polarized towards a M1 phenotype by LPS, or to a M2 phenotype by IL4, while simultaneous exposure to LPS plus IL4 resulted in a hybrid phenotype expressing both M1- and M2-characteristic markers. M2 microglia migrated less but exhibit higher phagocytic activity than M1 microglia. Defined mediators switched microglia from one polarization state to the other, a process more effective when transforming M2 microglia towards M1 than vice versa. Polarized microglia had differential effects on the differentiation potential of NSCs in vitro and in vivo, with M1 microglia promoting astrocytogenesis, while M2 microglia supported neurogenesis. Regardless of their polarization, microglia inhibited NSC proliferation, increased NSC migration, and accelerated NSC differentiation. Conclusion Overall, this study shed light on the complex conditions governing microglia polarization and the effects of differentially polarized microglia on critical functions of NSCs in vitro and in vivo. Refining the understanding of microglia activation and their modulatory effects on NSCs is likely to facilitate the development of innovative therapeutic concepts supporting the innate regenerative capacity of the brain. Electronic supplementary material The online version of this article (10.1186/s12974-018-1261-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Sabine Ulrike Vay
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany.
| | - Lea Jessica Flitsch
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany
| | - Monika Rabenstein
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany
| | - Rebecca Rogall
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany
| | - Stefan Blaschke
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Judith Kleinhaus
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany
| | - Noémie Reinert
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany
| | - Annika Bach
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany
| | - Gereon Rudolf Fink
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Michael Schroeter
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Maria Adele Rueger
- Department of Neurology, University Hospital of Cologne, Kerpener Str. 62, 50924, Cologne, Germany.,Cognitive Neuroscience, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
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Feldbrin Z, Omelchenko E, Lipkin A, Shargorodsky M. Osteopontin levels in plasma, muscles, and bone in patient with non-healing diabetic foot ulcers: A new player in wound healing process? J Diabetes Complications 2018; 32:795-798. [PMID: 29871782 DOI: 10.1016/j.jdiacomp.2018.05.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 03/15/2018] [Accepted: 05/12/2018] [Indexed: 02/06/2023]
Abstract
BACKGROUND The present study was designed to investigate the impact of osteopontin (OPN) in different tissue (e.g., plasma, muscles and bone) on amputation rate (in-hospital and during one year follow-up) for non-healing diabetic foot ulcers (DFUs). METHODS This pilot study consisted of 30 diabetic patients, hospitalized due to non-healing DFUs. Patients were divided into two groups: Group 1 included 14 patients who underwent limb-preserved debridement procedure without amputation; Group 2 included 16 subjects who underwent amputation. Additionally, recurrent amputation rate during 1 year follow-up was investigated. RESULTS Plasma OPN was higher and bone OPN was lower in Group 2 compared to Group 1 (p = 0.016 and p = 0.004, respectively). In the logistic regression analysis, bone OPN emerged as a significant independent predictor of amputation (OR = 0.042, 95% CI 0.003-0.699, p = 0.027). Plasma OPN was also associated with amputation such that each unit increase in plasma OPN was associated with an increase in odds of amputation of 17.7% (95% CI 0.997-1.388, p = 0.045). During 1 year follow-up 11 patients underwent recurrent amputation. Plasma OPN were higher and bone osteopontin was lower in patients who underwent amputation compared to patients who did not need amputation at one year follow-up. However, in GLM analysis bone OPN was only marginally associated with one year amputation (OR 0.001, 95% CI 0.000-2.0, p = 0.076). CONCLUSIONS Decreased levels of OPN in bone and increased plasma OPN are independently associated with in-hospital amputation. Consequently, plasma OPN may be relevant in the routine assessment of amputation risk in this patient population.
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Affiliation(s)
- Z Feldbrin
- Department of Diabetic Foot, Wolfson Medical Center, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - E Omelchenko
- Department of Diabetic Foot, Wolfson Medical Center, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - A Lipkin
- Department of Diabetic Foot, Wolfson Medical Center, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - M Shargorodsky
- Department of Endocrinology, Wolfson Medical Center, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
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Rogall R, Rabenstein M, Vay S, Bach A, Pikhovych A, Baermann J, Hoehn M, Couillard-Despres S, Fink GR, Schroeter M, Rueger MA. Bioluminescence imaging visualizes osteopontin-induced neurogenesis and neuroblast migration in the mouse brain after stroke. Stem Cell Res Ther 2018; 9:182. [PMID: 29973246 PMCID: PMC6032781 DOI: 10.1186/s13287-018-0927-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 05/24/2018] [Accepted: 06/13/2018] [Indexed: 11/26/2022] Open
Abstract
Background Osteopontin (OPN), an acidic phosphoglycoprotein, is upregulated in the brain after cerebral ischemia. We previously reported that OPN supports migration, survival, and proliferation of neural stem cells (NSC) in primary cell culture, as well as their differentiation into neurons. We here analyzed the effects of OPN on neuroblasts in vivo in the context of cerebral ischemia. Methods Transgenic mice expressing luciferase under the control of the neuroblast-specific doublecortin (DCX)-promoter, allowing visualization of neuroblasts in vivo using bioluminescence imaging (BLI), were injected with OPN intracerebroventricularly while control mice were injected with vehicle buffer. To assess the effects of OPN after ischemia, additional mice were subjected to photothrombosis and injected with either OPN or vehicle. Results OPN enhanced the migration of neuroblasts both in the healthy brain and after ischemia, as quantified by BLI in vivo. Moreover, the number of neural progenitors was increased following OPN treatment, with the maximum effect on the second day after OPN injection into the healthy brain, and 14 days after OPN injection following ischemia. After ischemia, OPN quantitatively promoted the endogenous, ischemia-induced neuroblast expansion, and additionally recruited progenitors from the contralateral hemisphere. Conclusions Our results strongly suggest that OPN constitutes a promising substance for the targeted activation of neurogenesis in ischemic stroke.
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Affiliation(s)
- Rebecca Rogall
- Department of Neurology, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany
| | - Monika Rabenstein
- Department of Neurology, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Sabine Vay
- Department of Neurology, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Annika Bach
- Department of Neurology, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany
| | - Anton Pikhovych
- Department of Neurology, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany
| | - Johannes Baermann
- Department of Neurology, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany
| | - Mathias Hoehn
- Max Planck Institute for Metabolism Research, Cologne, Germany
| | - Sébastien Couillard-Despres
- Institute of Experimental Neuroregeneration, Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
| | - Gereon Rudolf Fink
- Department of Neurology, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Cognitive Neuroscience Section, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Michael Schroeter
- Department of Neurology, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany.,Max Planck Institute for Metabolism Research, Cologne, Germany.,Cognitive Neuroscience Section, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany
| | - Maria Adele Rueger
- Department of Neurology, University Hospital of Cologne, Kerpener Strasse 62, 50924, Cologne, Germany. .,Max Planck Institute for Metabolism Research, Cologne, Germany. .,Cognitive Neuroscience Section, Institute of Neuroscience and Medicine (INM-3), Research Centre Juelich, Juelich, Germany.
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Osteopontin Augments M2 Microglia Response and Separates M1- and M2-Polarized Microglial Activation in Permanent Focal Cerebral Ischemia. Mediators Inflamm 2017; 2017:7189421. [PMID: 29104378 PMCID: PMC5632451 DOI: 10.1155/2017/7189421] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 07/30/2017] [Accepted: 08/29/2017] [Indexed: 01/17/2023] Open
Abstract
Background Focal cerebral ischemia induces distinct neuroinflammatory processes. We recently reported the extracellular phosphor-glyco-protein osteopontin (OPN) to directly affect primary microglia in vitro, promoting survival while shifting their inflammatory profile towards a more neutral phenotype. We here assessed the effects of OPN on microglia after stroke in vivo, with focus on infarct demarcation. Methods Animals underwent focal photothrombotic stroke and were injected intracerebroventricularly with 500 μg OPN or vehicle. Immunohistochemistry assessed neuronal damage and infarct volume, neovascularisation, glial scar formation, microglial activation, and M1 and M2 polarisation. Results After photothrombotic stroke, areas covered by M1 and M2 microglia substantially overlapped. OPN treatment reduced that overlap, with microglia appearing more spread out and additionally covering the infarct core. OPN additionally modulated the quantity of microglia subpopulations, reducing iNOS+ M1 cells while increasing M2 microglia, shifting the M1/M2 balance towards an M2 phenotype. Moreover, OPN polarized astrocytes towards the infarct. Conclusion Microglial activation and M1 and M2 polarization have distinct but overlapping spatial patterns in permanent focal ischemia. Data suggest that OPN is involved in separating M1 and M2 subpopulations, as well as in shifting microglia polarization towards the M2 phenotype modulating beneficially inflammatory responses after focal infarction.
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The Effect of Osteopontin on Microglia. BIOMED RESEARCH INTERNATIONAL 2017; 2017:1879437. [PMID: 28698867 PMCID: PMC5494082 DOI: 10.1155/2017/1879437] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 04/29/2017] [Accepted: 05/24/2017] [Indexed: 12/16/2022]
Abstract
Osteopontin (OPN) is a proinflammatory cytokine that can be secreted from many cells, including activated macrophages and T-lymphocytes, and is widely distributed in many tissues and cells. OPN, a key factor in tissue repairing and extracellular matrix remodeling after injury, is a constituent of the extracellular matrix of the central nervous system (CNS). Recently, the role of OPN in neurodegenerative diseases has gradually caused widespread concern. Microglia are resident macrophage-like immune cells in CNS and play a vital role in both physiological and pathological conditions, including restoring the integrity of the CNS and promoting the progression of neurodegenerative disorders. Microglia's major function is to maintain homeostasis and the normal function of the CNS, both during development and in response to CNS injury. Although the functional mechanism of OPN in CNS neurodegenerative diseases has yet to be fully elucidated, most studies suggest that OPN play a role in pathogenesis of neurodegenerative diseases or in neuroprotection by regulating the activation and function of microglia. Here, we summarize the functions of OPN on microglia in response to various stimulations in vitro and in vivo.
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