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Gao R, Song SJ, Tian MY, Wang LB, Zhang Y, Li X. Myelin debris phagocytosis in demyelinating disease. Glia 2024. [PMID: 39073200 DOI: 10.1002/glia.24602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 07/16/2024] [Accepted: 07/18/2024] [Indexed: 07/30/2024]
Abstract
Demyelinating diseases are often caused by a variety of triggers, including immune responses, viral infections, malnutrition, hypoxia, or genetic factors, all of which result in the loss of myelin in the nervous system. The accumulation of myelin debris at the lesion site leads to neuroinflammation and inhibits remyelination; therefore, it is crucial to promptly remove the myelin debris. Initially, Fc and complement receptors on cellular surfaces were the primary clearance receptors responsible for removing myelin debris. However, subsequent studies have unveiled the involvement of additional receptors, including Mac-2, TAM receptors, and the low-density lipoprotein receptor-related protein 1, in facilitating the removal process. In addition to microglia and macrophages, which serve as the primary effector cells in the disease phase, a variety of other cell types such as astrocytes, Schwann cells, and vascular endothelial cells have been demonstrated to engage in the phagocytosis of myelin debris. Furthermore, we have concluded that oligodendrocyte precursor cells, as myelination precursor cells, also exhibit this phagocytic capability. Moreover, our research group has innovatively identified the low-density lipoprotein receptor as a potential phagocytic receptor for myelin debris. In this article, we discuss the functional processes of various phagocytes in demyelinating diseases. We also highlight the alterations in signaling pathways triggered by phagocytosis, and provide a comprehensive overview of the various phagocytic receptors involved. Such insights are invaluable for pinpointing potential therapeutic strategies for the treatment of demyelinating diseases by targeting phagocytosis.
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Affiliation(s)
- Rui Gao
- The Ministry of Education, College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi, China
| | - Sheng-Jiao Song
- The Ministry of Education, College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi, China
| | - Meng-Yuan Tian
- The Ministry of Education, College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi, China
| | - Li-Bin Wang
- Neurosurgery Department, Huazhong University of Science and Technology Union Shenzhen Hospital/Shenzhen Nanshan Hospital, Shenzhen, Guangdong, China
| | - Yuan Zhang
- The Ministry of Education, College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi, China
| | - Xing Li
- The Ministry of Education, College of Life Sciences, Shaanxi Normal University, Xi'an, Shaanxi, China
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2
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Tiwari V, Prajapati B, Asare Y, Damkou A, Ji H, Liu L, Naser N, Gouna G, Leszczyńska KB, Mieczkowski J, Dichgans M, Wang Q, Kawaguchi R, Shi Z, Swarup V, Geschwind DH, Prinz M, Gokce O, Simons M. Innate immune training restores pro-reparative myeloid functions to promote remyelination in the aged central nervous system. Immunity 2024:S1074-7613(24)00348-0. [PMID: 39053462 DOI: 10.1016/j.immuni.2024.07.001] [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: 04/26/2023] [Revised: 11/21/2023] [Accepted: 07/01/2024] [Indexed: 07/27/2024]
Abstract
The reduced ability of the central nervous system to regenerate with increasing age limits functional recovery following demyelinating injury. Previous work has shown that myelin debris can overwhelm the metabolic capacity of microglia, thereby impeding tissue regeneration in aging, but the underlying mechanisms are unknown. In a model of demyelination, we found that a substantial number of genes that were not effectively activated in aged myeloid cells displayed epigenetic modifications associated with restricted chromatin accessibility. Ablation of two class I histone deacetylases in microglia was sufficient to restore the capacity of aged mice to remyelinate lesioned tissue. We used Bacillus Calmette-Guerin (BCG), a live-attenuated vaccine, to train the innate immune system and detected epigenetic reprogramming of brain-resident myeloid cells and functional restoration of myelin debris clearance and lesion recovery. Our results provide insight into aging-associated decline in myeloid function and how this decay can be prevented by innate immune reprogramming.
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Affiliation(s)
- Vini Tiwari
- Institute of Neuronal Cell Biology, Technical University Munich, 81377 Munich, Germany; German Center for Neurodegenerative Diseases (DZNE), 81377 Munich, Germany
| | - Bharat Prajapati
- Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, 41390 Gothenburg, Sweden
| | - Yaw Asare
- Institute for Stroke and Dementia Research, University Hospital of Munich, LMU Munich, 81377 Munich, Germany
| | - Alkmini Damkou
- Institute of Neuronal Cell Biology, Technical University Munich, 81377 Munich, Germany; German Center for Neurodegenerative Diseases (DZNE), 81377 Munich, Germany
| | - Hao Ji
- Institute for Stroke and Dementia Research, University Hospital of Munich, LMU Munich, 81377 Munich, Germany
| | - Lu Liu
- German Center for Neurodegenerative Diseases (DZNE), 81377 Munich, Germany; Institute for Stroke and Dementia Research, University Hospital of Munich, LMU Munich, 81377 Munich, Germany
| | - Nawraa Naser
- Institute for Stroke and Dementia Research, University Hospital of Munich, LMU Munich, 81377 Munich, Germany
| | - Garyfallia Gouna
- Institute of Neuronal Cell Biology, Technical University Munich, 81377 Munich, Germany; German Center for Neurodegenerative Diseases (DZNE), 81377 Munich, Germany
| | - Katarzyna B Leszczyńska
- Laboratory of Molecular Neurobiology, Nencki Institute of Experimental Biology of the Polish Academy of Sciences, 02093 Warsaw, Poland
| | - Jakub Mieczkowski
- Laboratory of Molecular Neurobiology, Nencki Institute of Experimental Biology of the Polish Academy of Sciences, 02093 Warsaw, Poland; 3P-Medicine Laboratory, Medical University of Gdańsk, 80211 Gdańsk, Poland
| | - Martin Dichgans
- German Center for Neurodegenerative Diseases (DZNE), 81377 Munich, Germany; Munich Cluster of Systems Neurology (SyNergy), 81377 Munich, Germany; Institute for Stroke and Dementia Research, University Hospital of Munich, LMU Munich, 81377 Munich, Germany
| | - Qing Wang
- Departments of Neurology and Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Riki Kawaguchi
- Departments of Neurology and Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095, USA; Psychiatry, Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Zechuan Shi
- Department of Neurobiology and Behavior, University of California, Irvine, CA, USA
| | - Vivek Swarup
- Department of Neurobiology and Behavior, University of California, Irvine, CA, USA
| | - Daniel H Geschwind
- Departments of Neurology and Human Genetics, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Marco Prinz
- Institute of Neuropathology, Faculty of Medicine, University of Freiburg, 79085 Freiburg, Germany; Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
| | - Ozgun Gokce
- Munich Cluster of Systems Neurology (SyNergy), 81377 Munich, Germany; Institute for Stroke and Dementia Research, University Hospital of Munich, LMU Munich, 81377 Munich, Germany; German Center for Neurodegenerative Diseases (DZNE), 53127 Bonn, Germany; Department of Neurodegenerative Diseases and Geriatric Psychiatry, University Hospital Bonn, 53127 Bonn, Germany
| | - Mikael Simons
- Institute of Neuronal Cell Biology, Technical University Munich, 81377 Munich, Germany; German Center for Neurodegenerative Diseases (DZNE), 81377 Munich, Germany; Munich Cluster of Systems Neurology (SyNergy), 81377 Munich, Germany; Institute for Stroke and Dementia Research, University Hospital of Munich, LMU Munich, 81377 Munich, Germany.
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Ou Z, Cheng Y, Ma H, Chen K, Lin Q, Chen J, Guo R, Huang Z, Cheng Q, Alaeiilkhchi N, Zhu Q, Huang Z, Jiang H. miR-223 accelerates lipid droplets clearance in microglia following spinal cord injury by upregulating ABCA1. J Transl Med 2024; 22:659. [PMID: 39010173 PMCID: PMC11247820 DOI: 10.1186/s12967-024-05480-5] [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: 01/30/2024] [Accepted: 07/03/2024] [Indexed: 07/17/2024] Open
Abstract
BACKGROUND Spinal cord injury (SCI) is characterized by extensive demyelination and inflammatory responses. Facilitating the clearance of lipid droplets (LDs) within microglia contributes to creating a microenvironment that favors neural recovery and provides essential materials for subsequent remyelination. Therefore, investigating MicroRNAs (miRNAs) that regulate lipid homeostasis after SCI and elucidating their potential mechanisms in promoting LDs clearance in microglia have become focal points of SCI research. METHODS We established a subacute C5 hemicontusion SCI model in mice and performed transcriptomic sequencing on the injury epicenter to identify differentially expressed genes and associated pathways. Confocal imaging was employed to observe LDs accumulation. Multi-omics analyses were conducted to identify differentially expressed mRNA and miRNA post-SCI. Pathway enrichment analysis and protein-protein interaction network construction were performed using bioinformatics methods, revealing miR-223-Abca1 as a crucial miRNA-mRNA pair in lipid metabolism regulation. BV2 microglia cell lines overexpressing miR-223 were engineered, and immunofluorescence staining, western blot, and other techniques were employed to assess LDs accumulation, relevant targets, and inflammatory factor expression, confirming its role in regulating lipid homeostasis in microglia. RESULTS Histopathological results of our hemicontusion SCI model confirmed LDs aggregation at the injury epicenter, predominantly within microglia. Our transcriptomic analysis during the subacute phase of SCI in mice implicated ATP-binding cassette transporter A1 (Abca1) as a pivotal gene in lipid homeostasis, cholesterol efflux and microglial activation. Integrative mRNA-miRNA multi-omics analysis highlighted the crucial role of miR-223 in the neuroinflammation process following SCI, potentially through the regulation of lipid metabolism via Abca1. In vitro experiments using BV2 cells overexpressing miR-223 demonstrated that elevated levels of miR-223 enhance ABCA1 expression in myelin debris and LPS-induced BV2 cells. This promotes myelin debris degradation and LDs clearance, and induces a shift toward an anti-inflammatory M2 phenotype. CONCLUSIONS In summary, our study unveils the critical regulatory role of miR-223 in lipid homeostasis following SCI. The mechanism by which this occurs involves the upregulation of ABCA1 expression, which facilitates LDs clearance and myelin debris degradation, consequently alleviating the lipid burden, and inhibiting inflammatory polarization of microglia. These findings suggest that strategies to enhance miR-223 expression and target ABCA1, thereby augmenting LDs clearance, may emerge as appealing new clinical targets for SCI treatment.
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Affiliation(s)
- Zhilin Ou
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Yongquan Cheng
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Hao Ma
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Kai Chen
- The First School of Clinical Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Qiong Lin
- School of Anesthesiology, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Jiayu Chen
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Ruqin Guo
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Zhiping Huang
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Qixian Cheng
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Nima Alaeiilkhchi
- International Collaboration on Repair Discoveries (ICORD), Blusson Spinal Cord Centre, University of British Columbia, Vancouver, Canada
| | - Qingan Zhu
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Zucheng Huang
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.
| | - Hui Jiang
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.
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Wang X, Cheng Z, Tai W, Shi M, Ayazi M, Liu Y, Sun L, Yu C, Fan Z, Guo B, He X, Sun D, Young W, Ren Y. Targeting foamy macrophages by manipulating ABCA1 expression to facilitate lesion healing in the injured spinal cord. Brain Behav Immun 2024; 119:431-453. [PMID: 38636566 DOI: 10.1016/j.bbi.2024.04.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 04/03/2024] [Accepted: 04/16/2024] [Indexed: 04/20/2024] Open
Abstract
Spinal cord injury (SCI) triggers a complex cascade of events, including myelin loss, neuronal damage, neuroinflammation, and the accumulation of damaged cells and debris at the injury site. Infiltrating bone marrow derived macrophages (BMDMϕ) migrate to the epicenter of the SCI lesion, where they engulf cell debris including abundant myelin debris to become pro-inflammatory foamy macrophages (foamy Mϕ), participate neuroinflammation, and facilitate the progression of SCI. This study aimed to elucidate the cellular and molecular mechanisms underlying the functional changes in foamy Mϕ and their potential implications for SCI. Contusion at T10 level of the spinal cord was induced using a New York University (NYU) impactor (5 g rod from a height of 6.25 mm) in male mice. ABCA1, an ATP-binding cassette transporter expressed by Mϕ, plays a crucial role in lipid efflux from foamy cells. We observed that foamy Mϕ lacking ABCA1 exhibited increased lipid accumulation and a higher presence of lipid-accumulated foamy Mϕ as well as elevated pro-inflammatory response in vitro and in injured spinal cord. We also found that both genetic and pharmacological enhancement of ABCA1 expression accelerated lipid efflux from foamy Mϕ, reduced lipid accumulation and inhibited the pro-inflammatory response of foamy Mϕ, and accelerated clearance of cell debris and necrotic cells, which resulted in functional recovery. Our study highlights the importance of understanding the pathologic role of foamy Mϕ in SCI progression and the potential of ABCA1 as a therapeutic target for modulating the inflammatory response, promoting lipid metabolism, and facilitating functional recovery in SCI.
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Affiliation(s)
- Xi Wang
- W. M. Keck Center for Collaborative Neuroscience, Rutgers, State University of New Jersey, New Brunswick, NJ 08854, USA; Institute of Neurosciences, Fourth Military Medical University, Xi'an 710032, China; College of Life Sciences and Medicine, Northwest University, Xi'an 710069, China.
| | - Zhijian Cheng
- Department of Biomedical Sciences, Florida State University College of Medicine, 1115 West Call Street, Tallahassee, FL 32306, USA
| | - Wenjiao Tai
- Department of Biomedical Sciences, Florida State University College of Medicine, 1115 West Call Street, Tallahassee, FL 32306, USA
| | - Mingjun Shi
- Department of Biomedical Sciences, Florida State University College of Medicine, 1115 West Call Street, Tallahassee, FL 32306, USA
| | - Maryam Ayazi
- Department of Biomedical Sciences, Florida State University College of Medicine, 1115 West Call Street, Tallahassee, FL 32306, USA
| | - Yang Liu
- Department of Biomedical Sciences, Florida State University College of Medicine, 1115 West Call Street, Tallahassee, FL 32306, USA
| | - Li Sun
- Department of Biomedical Sciences, Florida State University College of Medicine, 1115 West Call Street, Tallahassee, FL 32306, USA
| | - Caiyong Yu
- Institute of Neurosciences, Fourth Military Medical University, Xi'an 710032, China
| | - Zhongmin Fan
- Department of Critical Care Medicine and Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Xi'an 710032, China
| | - Bin Guo
- Department of Pathology, Guizhou Medical University, Guiyang 550025, China
| | - Xijing He
- Department of Orthopedics, Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Dongming Sun
- W. M. Keck Center for Collaborative Neuroscience, Rutgers, State University of New Jersey, New Brunswick, NJ 08854, USA
| | - Wise Young
- W. M. Keck Center for Collaborative Neuroscience, Rutgers, State University of New Jersey, New Brunswick, NJ 08854, USA
| | - Yi Ren
- W. M. Keck Center for Collaborative Neuroscience, Rutgers, State University of New Jersey, New Brunswick, NJ 08854, USA; Department of Biomedical Sciences, Florida State University College of Medicine, 1115 West Call Street, Tallahassee, FL 32306, USA.
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Ma H, Ou ZL, Alaeiilkhchi N, Cheng YQ, Chen K, Chen JY, Guo RQ, He MY, Tang SY, Zhang X, Huang ZP, Liu J, Liu J, Zhu QA, Huang ZC, Jiang H. MiR-223 enhances lipophagy by suppressing CTSB in microglia following lysolecithin-induced demyelination in mice. Lipids Health Dis 2024; 23:194. [PMID: 38909243 PMCID: PMC11193262 DOI: 10.1186/s12944-024-02185-y] [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: 02/07/2024] [Accepted: 06/13/2024] [Indexed: 06/24/2024] Open
Abstract
BACKGROUND Lipid droplet (LD)-laden microglia is a key pathological hallmark of multiple sclerosis. The recent discovery of this novel microglial subtype, lipid-droplet-accumulating microglia (LDAM), is notable for increased inflammatory factor secretion and diminished phagocytic capability. Lipophagy, the autophagy-mediated selective degradation of LDs, plays a critical role in this context. This study investigated the involvement of microRNAs (miRNAs) in lipophagy during demyelinating diseases, assessed their capacity to modulate LDAM subtypes, and elucidated the potential underlying mechanisms involved. METHODS C57BL/6 mice were used for in vivo experiments. Two weeks post demyelination induction at cervical level 4 (C4), histological assessments and confocal imaging were performed to examine LD accumulation in microglia within the lesion site. Autophagic changes were observed using transmission electron microscopy. miRNA and mRNA multi-omics analyses identified differentially expressed miRNAs and mRNAs under demyelinating conditions and the related autophagy target genes. The role of miR-223 in lipophagy under these conditions was specifically explored. In vitro studies, including miR-223 upregulation in BV2 cells via lentiviral infection, validated the bioinformatics findings. Immunofluorescence staining was used to measure LD accumulation, autophagy levels, target gene expression, and inflammatory mediator levels to elucidate the mechanisms of action of miR-223 in LDAM. RESULTS Oil Red O staining and confocal imaging revealed substantial LD accumulation in the demyelinated spinal cord. Transmission electron microscopy revealed increased numbers of autophagic vacuoles at the injury site. Multi-omics analysis revealed miR-223 as a crucial regulatory gene in lipophagy during demyelination. It was identified that cathepsin B (CTSB) targets miR-223 in autophagy to integrate miRNA, mRNA, and autophagy gene databases. In vitro, miR-223 upregulation suppressed CTSB expression in BV2 cells, augmented autophagy, alleviated LD accumulation, and decreased the expression of the inflammatory mediator IL-1β. CONCLUSION These findings indicate that miR-223 plays a pivotal role in lipophagy under demyelinating conditions. By inhibiting CTSB, miR-223 promotes selective LD degradation, thereby reducing the lipid burden and inflammatory phenotype in LDAM. This study broadens the understanding of the molecular mechanisms of lipophagy and proposes lipophagy induction as a potential therapeutic approach to mitigate inflammatory responses in demyelinating diseases.
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Grants
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No.81902217 National Natural Science Foundation of China
- No. 81972064 National Natural Science Foundation of China
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- 2020A1515011415 Natural Science Foundation of Guangdong Province
- 2023A1515010565 Natural Science Foundation of Guangdong Province
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- No.2023A024 President Foundation of Nanfang Hospital, Southern Medical University
- 202102021244 Guangzhou Science and Technology Plan Project
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Affiliation(s)
- Hao Ma
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Zhi-Lin Ou
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Nima Alaeiilkhchi
- International Collaboration on Repair Discoveries (ICORD), Blusson Spinal Cord Centre, University of British Columbia, Vancouver, Canada
| | - Yong-Quan Cheng
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Kai Chen
- The First School of Clinical Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Jia-Yu Chen
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Ru-Qin Guo
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Min-Yue He
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Shi-Yi Tang
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Xin Zhang
- Department of Laboratory Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Zhi-Ping Huang
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Junhao Liu
- Division of Spine Surgery, Department of Orthopaedics, Guangzhou First People's Hospital, School of Medicine, South China University of Technology, Guangzhou, 51000, China
| | - Jie Liu
- The 3rd Affiliated Hospital of Xinxiang Medical University, Henan, China
| | - Qing-An Zhu
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China
| | - Zu-Cheng Huang
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.
| | - Hui Jiang
- Division of Spine Surgery, Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, Guangdong, China.
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Loix M, Zelcer N, Bogie JFJ, Hendriks JJA. The ubiquitous role of ubiquitination in lipid metabolism. Trends Cell Biol 2024; 34:416-429. [PMID: 37770289 DOI: 10.1016/j.tcb.2023.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 08/17/2023] [Accepted: 09/01/2023] [Indexed: 09/30/2023]
Abstract
Lipids are essential molecules that play key roles in cell physiology by serving as structural components, for storage of energy, and in signal transduction. Hence, efficient regulation and maintenance of lipid homeostasis are crucial for normal cellular and tissue function. In the past decade, increasing research has shown the importance of ubiquitination in regulating the stability of key players in different aspects of lipid metabolism. This review describes recent insights into the regulation of lipid metabolism by ubiquitin signaling, discusses how ubiquitination can be targeted in diseases characterized by lipid dysregulation, and identifies areas that require further research.
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Affiliation(s)
- Melanie Loix
- Biomedical Research Institute, School of Life Sciences, Hasselt University, Diepenbeek, Belgium; University MS Center Hasselt, Pelt, Belgium
| | - Noam Zelcer
- Department of Medical Biochemistry, Amsterdam UMC, Amsterdam Cardiovascular Sciences and Gastroenterology and Metabolism, University of Amsterdam, Amsterdam, The Netherlands
| | - Jeroen F J Bogie
- Biomedical Research Institute, School of Life Sciences, Hasselt University, Diepenbeek, Belgium; University MS Center Hasselt, Pelt, Belgium
| | - Jerome J A Hendriks
- Biomedical Research Institute, School of Life Sciences, Hasselt University, Diepenbeek, Belgium; University MS Center Hasselt, Pelt, Belgium.
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7
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Villa M, Wu J, Hansen S, Pahnke J. Emerging Role of ABC Transporters in Glia Cells in Health and Diseases of the Central Nervous System. Cells 2024; 13:740. [PMID: 38727275 PMCID: PMC11083179 DOI: 10.3390/cells13090740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 04/15/2024] [Accepted: 04/20/2024] [Indexed: 05/13/2024] Open
Abstract
ATP-binding cassette (ABC) transporters play a crucial role for the efflux of a wide range of substrates across different cellular membranes. In the central nervous system (CNS), ABC transporters have recently gathered significant attention due to their pivotal involvement in brain physiology and neurodegenerative disorders, such as Alzheimer's disease (AD). Glial cells are fundamental for normal CNS function and engage with several ABC transporters in different ways. Here, we specifically highlight ABC transporters involved in the maintenance of brain homeostasis and their implications in its metabolic regulation. We also show new aspects related to ABC transporter function found in less recognized diseases, such as Huntington's disease (HD) and experimental autoimmune encephalomyelitis (EAE), as a model for multiple sclerosis (MS). Understanding both their impact on the physiological regulation of the CNS and their roles in brain diseases holds promise for uncovering new therapeutic options. Further investigations and preclinical studies are warranted to elucidate the complex interplay between glial ABC transporters and physiological brain functions, potentially leading to effective therapeutic interventions also for rare CNS disorders.
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Affiliation(s)
- Maria Villa
- Translational Neurodegeneration Research and Neuropathology Lab, Department of Clinical Medicine (KlinMed), Medical Faculty, University of Oslo (UiO) and Section of Neuropathology Research, Department of Pathology (PAT), Clinics for Laboratory Medicine (KLM), Oslo University Hospital (OUS), Sognsvannsveien 20, NO-0372 Oslo, Norway
| | - Jingyun Wu
- Translational Neurodegeneration Research and Neuropathology Lab, Department of Clinical Medicine (KlinMed), Medical Faculty, University of Oslo (UiO) and Section of Neuropathology Research, Department of Pathology (PAT), Clinics for Laboratory Medicine (KLM), Oslo University Hospital (OUS), Sognsvannsveien 20, NO-0372 Oslo, Norway
| | - Stefanie Hansen
- Translational Neurodegeneration Research and Neuropathology Lab, Department of Clinical Medicine (KlinMed), Medical Faculty, University of Oslo (UiO) and Section of Neuropathology Research, Department of Pathology (PAT), Clinics for Laboratory Medicine (KLM), Oslo University Hospital (OUS), Sognsvannsveien 20, NO-0372 Oslo, Norway
| | - Jens Pahnke
- Translational Neurodegeneration Research and Neuropathology Lab, Department of Clinical Medicine (KlinMed), Medical Faculty, University of Oslo (UiO) and Section of Neuropathology Research, Department of Pathology (PAT), Clinics for Laboratory Medicine (KLM), Oslo University Hospital (OUS), Sognsvannsveien 20, NO-0372 Oslo, Norway
- Institute of Nutritional Medicine (INUM)/Lübeck Institute of Dermatology (LIED), University of Lübeck (UzL) and University Medical Center Schleswig-Holstein (UKSH), Ratzeburger Allee 160, D-23538 Lübeck, Germany
- Department of Pharmacology, Faculty of Medicine, University of Latvia (LU), Jelgavas iela 3, LV-1004 Rīga, Latvia
- School of Neurobiology, Biochemistry and Biophysics, The Georg S. Wise Faculty of Life Sciences, Tel Aviv University (TAU), Tel Aviv IL-6997801, Israel
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8
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Hamilton LK, M'Bra PEH, Mailloux S, Galoppin M, Aumont A, Fernandes KJL. Central inhibition of stearoyl-CoA desaturase has minimal effects on the peripheral metabolic symptoms of the 3xTg Alzheimer's disease mouse model. Sci Rep 2024; 14:7742. [PMID: 38565895 PMCID: PMC10987571 DOI: 10.1038/s41598-024-58272-8] [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: 09/18/2023] [Accepted: 03/27/2024] [Indexed: 04/04/2024] Open
Abstract
Evidence from genetic and epidemiological studies point to lipid metabolism defects in both the brain and periphery being at the core of Alzheimer's disease (AD) pathogenesis. Previously, we reported that central inhibition of the rate-limiting enzyme in monounsaturated fatty acid synthesis, stearoyl-CoA desaturase (SCD), improves brain structure and function in the 3xTg mouse model of AD (3xTg-AD). Here, we tested whether these beneficial central effects involve recovery of peripheral metabolic defects, such as fat accumulation and glucose and insulin handling. As early as 3 months of age, 3xTg-AD mice exhibited peripheral phenotypes including increased body weight and visceral and subcutaneous white adipose tissue as well as diabetic-like peripheral gluco-regulatory abnormalities. We found that intracerebral infusion of an SCD inhibitor that normalizes brain fatty acid desaturation, synapse loss and learning and memory deficits in middle-aged memory-impaired 3xTg-AD mice did not affect these peripheral phenotypes. This suggests that the beneficial effects of central SCD inhibition on cognitive function are not mediated by recovery of peripheral metabolic abnormalities. Given the widespread side-effects of systemically administered SCD inhibitors, these data suggest that selective inhibition of SCD in the brain may represent a clinically safer and more effective strategy for AD.
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Affiliation(s)
- Laura K Hamilton
- Research Center of the University of Montreal Hospital (CRCHUM), Montreal, Canada
- Department of Neurosciences, Faculty of Medicine, Université de Montréal, Montreal, Canada
| | - Paule E H M'Bra
- Research Center on Aging, CIUSSS de l'Estrie-CHUS, Sherbrooke, Canada
- Department of Medicine, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Canada
| | - Sophia Mailloux
- Research Center of the University of Montreal Hospital (CRCHUM), Montreal, Canada
- Department of Neurosciences, Faculty of Medicine, Université de Montréal, Montreal, Canada
| | - Manon Galoppin
- Research Center of the University of Montreal Hospital (CRCHUM), Montreal, Canada
- Department of Neurosciences, Faculty of Medicine, Université de Montréal, Montreal, Canada
| | - Anne Aumont
- Research Center on Aging, CIUSSS de l'Estrie-CHUS, Sherbrooke, Canada
- Department of Medicine, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Canada
| | - Karl J L Fernandes
- Research Center of the University of Montreal Hospital (CRCHUM), Montreal, Canada.
- Department of Neurosciences, Faculty of Medicine, Université de Montréal, Montreal, Canada.
- Research Center on Aging, CIUSSS de l'Estrie-CHUS, Sherbrooke, Canada.
- Department of Medicine, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Canada.
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9
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Gan H, Ma Q, Hao W, Yang N, Chen ZS, Deng L, Chen J. Targeting autophagy to counteract neuroinflammation: A novel antidepressant strategy. Pharmacol Res 2024; 202:107112. [PMID: 38403256 DOI: 10.1016/j.phrs.2024.107112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 02/01/2024] [Accepted: 02/19/2024] [Indexed: 02/27/2024]
Abstract
Depression is a common disease that affects physical and mental health and imposes a considerable burden on afflicted individuals and their families worldwide. Depression is associated with a high rate of disability and suicide. It causes a severe decline in productivity and quality of life. Unfortunately, the pathophysiological mechanisms underlying depression have not been fully elucidated, and the risk of its treatment is still presented. Studies have shown that the expression of autophagic markers in the brain and peripheral inflammatory mediators are dysregulated in depression. Autophagy-related genes regulate the level of autophagy and change the inflammatory response in depression. Depression is related to several aspects of immunity. The regulation of the immune system and inflammation by autophagy may lead to the development or deterioration of mental disorders. This review highlights the role of autophagy and neuroinflammation in the pathophysiology of depression, sumaries the autophagy-targeting small moleculars, and discusses a novel therapeutic strategy based on anti-inflammatory mechanisms that target autophagy to treat the disease.
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Affiliation(s)
- Hua Gan
- Guangzhou Key Laboratory of Formula-Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou 510632, China
| | - Qingyu Ma
- Guangzhou Key Laboratory of Formula-Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou 510632, China
| | - Wenzhi Hao
- Guangzhou Key Laboratory of Formula-Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou 510632, China
| | - Nating Yang
- Guangzhou Key Laboratory of Formula-Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou 510632, China
| | - Zhe-Sheng Chen
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, Queens, NY 11439, USA.
| | - Lijuan Deng
- Guangzhou Key Laboratory of Formula-Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou 510632, China.
| | - Jiaxu Chen
- Guangzhou Key Laboratory of Formula-Pattern Research Center, School of Traditional Chinese Medicine, Jinan University, Guangzhou 510632, China; School of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China.
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10
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Namiecinska M, Piatek P, Lewkowicz P. Nervonic Acid Synthesis Substrates as Essential Components in Profiled Lipid Supplementation for More Effective Central Nervous System Regeneration. Int J Mol Sci 2024; 25:3792. [PMID: 38612605 PMCID: PMC11011827 DOI: 10.3390/ijms25073792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 03/26/2024] [Accepted: 03/27/2024] [Indexed: 04/14/2024] Open
Abstract
Central nervous system (CNS) damage leads to severe neurological dysfunction as a result of neuronal cell death and axonal degeneration. As, in the mature CNS, neurons have little ability to regenerate their axons and reconstruct neural loss, demyelination is one of the hallmarks of neurological disorders such as multiple sclerosis (MS). Unfortunately, remyelination, as a regenerative process, is often insufficient to prevent axonal loss and improve neurological deficits after demyelination. Currently, there are still no effective therapeutic tools to restore neurological function, but interestingly, emerging studies prove the beneficial effects of lipid supplementation in a wide variety of pathological processes in the human body. In the future, available lipids with a proven beneficial effect on CNS regeneration could be included in supportive therapy, but this topic still requires further studies. Based on our and others' research, we review the role of exogenous lipids, pointing to substrates that are crucial in the remyelination process but are omitted in available studies, justifying the properly profiled supply of lipids in the human diet as a supportive therapy during CNS regeneration.
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Affiliation(s)
- Magdalena Namiecinska
- Department of Immunogenetics, Medical University of Lodz, Pomorska 251/A4 Street, 92-213 Lodz, Poland; (P.P.); (P.L.)
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11
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McCallum S, Suresh KB, Islam T, Saustad AW, Shelest O, Patil A, Lee D, Kwon B, Yenokian I, Kawaguchi R, Beveridge CH, Manchandra P, Randolph CE, Meares GP, Dutta R, Plummer J, Knott SRV, Chopra G, Burda JE. Lesion-remote astrocytes govern microglia-mediated white matter repair. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.03.15.585251. [PMID: 38558977 PMCID: PMC10979953 DOI: 10.1101/2024.03.15.585251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Spared regions of the damaged central nervous system undergo dynamic remodeling and exhibit a remarkable potential for therapeutic exploitation. Here, lesion-remote astrocytes (LRAs), which interact with viable neurons, glia and neural circuitry, undergo reactive transformations whose molecular and functional properties are poorly understood. Using multiple transcriptional profiling methods, we interrogated LRAs from spared regions of mouse spinal cord following traumatic spinal cord injury (SCI). We show that LRAs acquire a spectrum of molecularly distinct, neuroanatomically restricted reactivity states that evolve after SCI. We identify transcriptionally unique reactive LRAs in degenerating white matter that direct the specification and function of local microglia that clear lipid-rich myelin debris to promote tissue repair. Fueling this LRA functional adaptation is Ccn1 , which encodes for a secreted matricellular protein. Loss of astrocyte CCN1 leads to excessive, aberrant activation of local microglia with (i) abnormal molecular specification, (ii) dysfunctional myelin debris processing, and (iii) impaired lipid metabolism, culminating in blunted debris clearance and attenuated neurological recovery from SCI. Ccn1 -expressing white matter astrocytes are specifically induced by local myelin damage and generated in diverse demyelinating disorders in mouse and human, pointing to their fundamental, evolutionarily conserved role in white matter repair. Our findings show that LRAs assume regionally divergent reactivity states with functional adaptations that are induced by local context-specific triggers and influence disorder outcome. Astrocytes tile the central nervous system (CNS) where they serve vital roles that uphold healthy nervous system function, including regulation of synapse development, buffering of neurotransmitters and ions, and provision of metabolic substrates 1 . In response to diverse CNS insults, astrocytes exhibit disorder-context specific transformations that are collectively referred to as reactivity 2-5 . The characteristics of regionally and molecularly distinct reactivity states are incompletely understood. The mechanisms through which distinct reactivity states arise, how they evolve or resolve over time, and their consequences for local cell function and CNS disorder progression remain enigmatic. Immediately adjacent to CNS lesions, border-forming astrocytes (BFAs) undergo transcriptional reprogramming and proliferation to form a neuroprotective barrier that restricts inflammation and supports axon regeneration 6-9 . Beyond the lesion, spared but dynamic regions of the injured CNS exhibit varying degrees of synaptic circuit remodeling and progressive cellular responses to secondary damage that have profound consequences for neural repair and recovery 10,11 . Throughout these cytoarchitecturally intact, but injury-reactive regions, lesion-remote astrocytes (LRAs) intermingle with neurons and glia, undergo little to no proliferation, and exhibit varying degrees of cellular hypertrophy 7,12,13 . The molecular and functional properties of LRAs remain grossly undefined. Therapeutically harnessing spared regions of the injured CNS will require a clearer understanding of the accompanying cellular and molecular landscape. Here, we leveraged integrative transcriptional profiling methodologies to identify multiple spatiotemporally resolved, molecularly distinct states of LRA reactivity within the injured spinal cord. Computational modeling of LRA-mediated heterotypic cell interactions, astrocyte-specific conditional gene deletion, and multiple mouse models of acute and chronic CNS white matter degeneration were used to interrogate a newly identified white matter degeneration-reactive astrocyte subtype. We define how this reactivity state is induced and its role in governing the molecular and functional specification of local microglia that clear myelin debris from the degenerating white matter to promote repair.
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12
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Goldberg G, Coelho L, Mo G, Adang LA, Patne M, Chen Z, Garcia-Bassets I, Mesci P, Muotri AR. TREX1 is required for microglial cholesterol homeostasis and oligodendrocyte terminal differentiation in human neural assembloids. Mol Psychiatry 2024; 29:566-579. [PMID: 38129659 PMCID: PMC11153041 DOI: 10.1038/s41380-023-02348-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 11/22/2023] [Accepted: 11/27/2023] [Indexed: 12/23/2023]
Abstract
Three Prime Repair Exonuclease 1 (TREX1) gene mutations have been associated with Aicardi-Goutières Syndrome (AGS) - a rare, severe pediatric autoimmune disorder that primarily affects the brain and has a poorly understood etiology. Microglia are brain-resident macrophages indispensable for brain development and implicated in multiple neuroinflammatory diseases. However, the role of TREX1 - a DNase that cleaves cytosolic nucleic acids, preventing viral- and autoimmune-related inflammatory responses - in microglia biology remains to be elucidated. Here, we leverage a model of human embryonic stem cell (hESC)-derived engineered microglia-like cells, bulk, and single-cell transcriptomics, optical and transmission electron microscopy, and three-month-old assembloids composed of microglia and oligodendrocyte-containing organoids to interrogate TREX1 functions in human microglia. Our analyses suggest that TREX1 influences cholesterol metabolism, leading to an active microglial morphology with increased phagocytosis in the absence of TREX1. Notably, regulating cholesterol metabolism with an HMG-CoA reductase inhibitor, FDA-approved atorvastatin, rescues these microglial phenotypes. Functionally, TREX1 in microglia is necessary for the transition from gliogenic intermediate progenitors known as pre-oligodendrocyte precursor cells (pre-OPCs) to precursors of the oligodendrocyte lineage known as OPCs, impairing oligodendrogenesis in favor of astrogliogenesis in human assembloids. Together, these results suggest routes for therapeutic intervention in pathologies such as AGS based on microglia-specific molecular and cellular mechanisms.
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Affiliation(s)
- Gabriela Goldberg
- Department of Pediatrics, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
- Department of Cellular & Molecular Medicine, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
- Biomedical Sciences Graduate Program, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
| | - Luisa Coelho
- Department of Pediatrics, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
| | - Guoya Mo
- Universal Sequencing Technology Corporation, Carlsbad, CA, 92011, USA
| | - Laura A Adang
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Meenakshi Patne
- Department of Pediatrics, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
| | - Zhoutao Chen
- Universal Sequencing Technology Corporation, Carlsbad, CA, 92011, USA
| | | | - Pinar Mesci
- Department of Pediatrics, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA.
- Axiom Space, Houston, TX, 77058, USA.
| | - Alysson R Muotri
- Department of Pediatrics, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA.
- Department of Cellular & Molecular Medicine, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA.
- Kavli Institute for Brain and Mind, University of California San Diego, La Jolla, CA, 92093, USA.
- Center for Academic Research and Training in Anthropogeny (CARTA) and Archealization (ArchC), University of California San Diego, La Jolla, CA, 92093, USA.
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13
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Cavallero S, Roustaei M, Satta S, Cho JM, Phan H, Baek KI, Blázquez-Medela AM, Gonzalez-Ramos S, Vu K, Park SK, Yokota T, Sumner J, Mack JJ, Sigmund CD, Reddy ST, Li R, Hsiai TK. Exercise mitigates flow recirculation and activates metabolic transducer SCD1 to catalyze vascular protective metabolites. SCIENCE ADVANCES 2024; 10:eadj7481. [PMID: 38354249 PMCID: PMC10866565 DOI: 10.1126/sciadv.adj7481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 01/11/2024] [Indexed: 02/16/2024]
Abstract
Exercise promotes pulsatile shear stress in the arterial circulation and ameliorates cardiometabolic diseases. However, exercise-mediated metabolic transducers for vascular protection remain under-investigated. Untargeted metabolomic analysis demonstrated that wild-type mice undergoing voluntary wheel running exercise expressed increased endothelial stearoyl-CoA desaturase 1 (SCD1) that catalyzes anti-inflammatory lipid metabolites, namely, oleic (OA) and palmitoleic acids (PA), to mitigate NF-κB-mediated inflammatory responses. In silico analysis revealed that exercise augmented time-averaged wall shear stress but mitigated flow recirculation and oscillatory shear index in the lesser curvature of the mouse aortic arch. Following exercise, endothelial Scd1-deleted mice (Ldlr-/- Scd1EC-/-) on high-fat diet developed persistent VCAM1-positive endothelium in the lesser curvature and the descending aorta, whereas SCD1 overexpression via adenovirus transfection mitigated endoplasmic reticulum stress and inflammatory biomarkers. Single-cell transcriptomics of the aorta identified Scd1-positive and Vcam1-negative endothelial subclusters interacting with other candidate genes. Thus, exercise mitigates flow recirculation and activates endothelial SCD1 to catalyze OA and PA for vascular endothelial protection.
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Affiliation(s)
- Susana Cavallero
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
- Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, CA, USA
| | - Mehrdad Roustaei
- Department of Bioengineering, School of Engineering and Applied Science, University of California, Los Angeles, CA, USA
| | - Sandro Satta
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
- Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, CA, USA
| | - Jae Min Cho
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
- Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, CA, USA
| | - Henry Phan
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
| | - Kyung In Baek
- Department of Bioengineering, School of Engineering and Applied Science, University of California, Los Angeles, CA, USA
| | - Ana M. Blázquez-Medela
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
- Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, CA, USA
| | - Sheila Gonzalez-Ramos
- Department of Bioengineering, School of Engineering and Applied Science, University of California, Los Angeles, CA, USA
| | - Khoa Vu
- Department of Bioengineering, School of Engineering and Applied Science, University of California, Los Angeles, CA, USA
| | - Seul-Ki Park
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
| | - Tomohiro Yokota
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
- Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, CA, USA
| | - Jennifer Sumner
- Department of Psychology, College of Life Sciences, University of California, Los Angeles, CA, USA
| | - Julia J. Mack
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
| | - Curt D. Sigmund
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Srinivasa T. Reddy
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
- Department of Molecular and Medical Pharmacology, University of California, Los Angeles, CA, USA
| | - Rongsong Li
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
- Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, CA, USA
| | - Tzung K. Hsiai
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at University of California, Los Angeles, CA, USA
- Department of Medicine, VA Greater Los Angeles Health Care System, Los Angeles, CA, USA
- Department of Bioengineering, School of Engineering and Applied Science, University of California, Los Angeles, CA, USA
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14
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Tripathi S, Nathan CL, Tate MC, Horbinski CM, Templer JW, Rosenow JM, Sita TL, James CD, Deneen B, Miller SD, Heimberger AB. The immune system and metabolic products in epilepsy and glioma-associated epilepsy: emerging therapeutic directions. JCI Insight 2024; 9:e174753. [PMID: 38193532 PMCID: PMC10906461 DOI: 10.1172/jci.insight.174753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024] Open
Abstract
Epilepsy has a profound impact on quality of life. Despite the development of new antiseizure medications (ASMs), approximately one-third of affected patients have drug-refractory epilepsy and are nonresponsive to medical treatment. Nearly all currently approved ASMs target neuronal activity through ion channel modulation. Recent human and animal model studies have implicated new immunotherapeutic and metabolomic approaches that may benefit patients with epilepsy. In this Review, we detail the proinflammatory immune landscape of epilepsy and contrast this with the immunosuppressive microenvironment in patients with glioma-related epilepsy. In the tumor setting, excessive neuronal activity facilitates immunosuppression, thereby contributing to subsequent glioma progression. Metabolic modulation of the IDH1-mutant pathway provides a dual pathway for reversing immune suppression and dampening seizure activity. Elucidating the relationship between neurons and immunoreactivity is an area for the prioritization and development of the next era of ASMs.
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Affiliation(s)
- Shashwat Tripathi
- Department of Neurological Surgery
- Malnati Brain Tumor Institute of the Robert H. Lurie Comprehensive Cancer Center
| | | | | | - Craig M. Horbinski
- Malnati Brain Tumor Institute of the Robert H. Lurie Comprehensive Cancer Center
- Department of Pathology, and
| | | | | | - Timothy L. Sita
- Department of Neurological Surgery
- Department of Radiation Oncology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Charles D. James
- Department of Neurological Surgery
- Malnati Brain Tumor Institute of the Robert H. Lurie Comprehensive Cancer Center
| | - Benjamin Deneen
- Department of Neurosurgery, Baylor College of Medicine, Houston, Texas, USA
| | - Stephen D. Miller
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Amy B. Heimberger
- Department of Neurological Surgery
- Malnati Brain Tumor Institute of the Robert H. Lurie Comprehensive Cancer Center
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15
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Sun Q, Xing X, Wang H, Wan K, Fan R, Liu C, Wang Y, Wu W, Wang Y, Wang R. SCD1 is the critical signaling hub to mediate metabolic diseases: Mechanism and the development of its inhibitors. Biomed Pharmacother 2024; 170:115586. [PMID: 38042113 DOI: 10.1016/j.biopha.2023.115586] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Revised: 09/23/2023] [Accepted: 09/25/2023] [Indexed: 12/04/2023] Open
Abstract
Metabolic diseases, featured with dysregulated energy homeostasis, have become major global health challenges. Patients with metabolic diseases have high probability to manifest multiple complications in lipid metabolism, e.g. obesity, insulin resistance and fatty liver. Therefore, targeting the hub genes in lipid metabolism may systemically ameliorate the metabolic diseases, along with the complications. Stearoyl-CoA desaturase 1(SCD1) is a key enzyme that desaturates the saturated fatty acids (SFAs) derived from de novo lipogenesis or diet to generate monounsaturated fatty acids (MUFAs). SCD1 maintains the metabolic and tissue homeostasis by responding to, and integrating the multiple layers of endogenous stimuli, which is mediated by the synthesized MUFAs. It critically regulates a myriad of physiological processes, including energy homeostasis, development, autophagy, tumorigenesis and inflammation. Aberrant transcriptional and epigenetic activation of SCD1 regulates AMPK/ACC, SIRT1/PGC1α, NcDase/Wnt, etc, and causes aberrant lipid accumulation, thereby promoting the progression of obesity, non-alcoholic fatty liver, diabetes and cancer. This review critically assesses the integrative mechanisms of the (patho)physiological functions of SCD1 in metabolic homeostasis, inflammation and autophagy. For translational perspective, potent SCD1 inhibitors have been developed to treat various types of cancer. We thus discuss the multidisciplinary advances that greatly accelerate the development of SCD1 new inhibitors. In conclusion, besides cancer treatment, SCD1 may serve as the promising target to combat multiple metabolic complications simultaneously.
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Affiliation(s)
- Qin Sun
- School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China
| | - Xiaorui Xing
- School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China
| | - Huanyu Wang
- School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China
| | - Kang Wan
- School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China
| | - Ruobing Fan
- School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China
| | - Cheng Liu
- School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China
| | - Yongjian Wang
- School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China
| | - Wenyi Wu
- School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China
| | - Yibing Wang
- School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China.
| | - Ru Wang
- School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China.
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16
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Vanherle S, Guns J, Loix M, Mingneau F, Dierckx T, Wouters F, Kuipers K, Vangansewinkel T, Wolfs E, Lins PP, Bronckaers A, Lambrichts I, Dehairs J, Swinnen JV, Verberk SGS, Haidar M, Hendriks JJA, Bogie JFJ. Extracellular vesicle-associated cholesterol supports the regenerative functions of macrophages in the brain. J Extracell Vesicles 2023; 12:e12394. [PMID: 38124258 PMCID: PMC10733568 DOI: 10.1002/jev2.12394] [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: 01/30/2023] [Revised: 11/15/2023] [Accepted: 11/23/2023] [Indexed: 12/23/2023] Open
Abstract
Macrophages play major roles in the pathophysiology of various neurological disorders, being involved in seemingly opposing processes such as lesion progression and resolution. Yet, the molecular mechanisms that drive their harmful and benign effector functions remain poorly understood. Here, we demonstrate that extracellular vesicles (EVs) secreted by repair-associated macrophages (RAMs) enhance remyelination ex vivo and in vivo by promoting the differentiation of oligodendrocyte precursor cells (OPCs). Guided by lipidomic analysis and applying cholesterol depletion and enrichment strategies, we find that EVs released by RAMs show markedly elevated cholesterol levels and that cholesterol abundance controls their reparative impact on OPC maturation and remyelination. Mechanistically, EV-associated cholesterol was found to promote OPC differentiation predominantly through direct membrane fusion. Collectively, our findings highlight that EVs are essential for cholesterol trafficking in the brain and that changes in cholesterol abundance support the reparative impact of EVs released by macrophages in the brain, potentially having broad implications for therapeutic strategies aimed at promoting repair in neurodegenerative disorders.
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Affiliation(s)
- Sam Vanherle
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
| | - Jeroen Guns
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
| | - Melanie Loix
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
| | - Fleur Mingneau
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
| | - Tess Dierckx
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
| | - Flore Wouters
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
| | - Koen Kuipers
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
| | - Tim Vangansewinkel
- Department of Cardio and Organs Systems, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- VIB, Center for Brain & Disease Research, Laboratory of NeurobiologyUniversity of LeuvenLeuvenBelgium
| | - Esther Wolfs
- Department of Cardio and Organs Systems, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
| | - Paula Pincela Lins
- Department of Cardio and Organs Systems, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- Health DepartmentFlemish Institute for Technological ResearchMolBelgium
| | - Annelies Bronckaers
- Department of Cardio and Organs Systems, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
| | - Ivo Lambrichts
- Department of Cardio and Organs Systems, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
| | - Jonas Dehairs
- Department of Oncology, Laboratory of Lipid Metabolism and Cancer, Leuven Cancer InstituteUniversity of LeuvenLeuvenBelgium
| | - Johannes V. Swinnen
- Department of Oncology, Laboratory of Lipid Metabolism and Cancer, Leuven Cancer InstituteUniversity of LeuvenLeuvenBelgium
| | - Sanne G. S. Verberk
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
| | - Mansour Haidar
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
| | - Jerome J. A. Hendriks
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
| | - Jeroen F. J. Bogie
- Department of Immunology and Infection, Biomedical Research InstituteHasselt UniversityDiepenbeekBelgium
- University MS Center HasseltPeltBelgium
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17
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Yin J, Li S, Li J, Gong R, Jia Z, Liu J, Jin Z, Yang J, Liu Y. Association of serum oleic acid level with depression in American adults: a cross-sectional study. BMC Psychiatry 2023; 23:845. [PMID: 37974120 PMCID: PMC10652490 DOI: 10.1186/s12888-023-05271-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 10/11/2023] [Indexed: 11/19/2023] Open
Abstract
BACKGROUND As the most abundant fatty acid in plasma, oleic acid has been found to be associated with multiple neurological diseases; however, results from studies of the relationship between oleic acid and depression are inconsistent. METHODS This cross-sectional study analyzed 4,459 adults from the National Health and Nutrition Examination Survey 2011-2014. The following covariates were adjusted in multivariable logistic regression models: age, sex, race/ethnicity, education level, marital status, body mass index, physical activity, smoking status, alcohol status, metabolic syndrome, omega-3 polyunsaturated fatty acids, and total cholesterol. RESULTS Serum oleic acid levels were positively associated with depression. After adjusting for all covariates, for every 1 mmol/L increase in oleic acid levels, the prevalence of depression increased by 40% (unadjusted OR: 1.35, 95%CI: 1.16-1.57; adjusted OR: 1.40, 95% CI: 1.03-1.90). CONCLUSIONS Our study suggests that oleic acid may play a role in depression. Further research is needed to investigate the potential benefits of changing oleic acid levels for the treatment and prevention of depression.
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Affiliation(s)
- Jiahui Yin
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Siyuan Li
- Department of Psychiatry, Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jinling Li
- College of Acupuncture and Massage, Shandong University of Traditional Chinese Medicine, Jinan, China
| | | | - Zhixia Jia
- First Clinical Medical College, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Junjun Liu
- Nanjing Meishan Hospital, Nanjing, China
| | - Zhi Jin
- Department of Neurology, Shanghai Fifth People's Hospital, Fudan University, Shanghai, China
| | - Jiguo Yang
- College of Acupuncture and Massage, Shandong University of Traditional Chinese Medicine, Jinan, China.
| | - Yuanxiang Liu
- Department of Neurology, Shandong University of Traditional Chinese Medicine Affiliated Hospital, Jinan, China.
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18
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Wei H, Zhen L, Wang S, Yang L, Zhang S, Zhang Y, Jia P, Wang T, Wang K, Zhang Y, Ma L, Lv J, Zhang P. Glyceryl triacetate promotes blood-brain barrier recovery after ischemic stroke through lipogenesis-mediated IL-33 in mice. J Neuroinflammation 2023; 20:264. [PMID: 37968698 PMCID: PMC10648711 DOI: 10.1186/s12974-023-02942-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 10/30/2023] [Indexed: 11/17/2023] Open
Abstract
BACKGROUND Lipid metabolism has a crucial role in neural repair in neurodegenerative diseases. We recently revealed that lipogenesis-mediated interleukin-33 (IL-33) upregulation lead to blood-brain barrier (BBB) repair after ischemic stroke. However, manipulating the key enzyme fatty acid synthase (FASN) to enhance lipogenesis was very challenging. Glyceryl triacetate (GTA) was used as a donor of acetate and precursor of acetyl coenzyme A, the key substrate for de novo lipogenesis catalyzed by FASN. Therefore, we hypothesized that GTA would promote lipogenesis the peri-infarct after ischemic stroke and contribute to the BBB repair through IL-33. METHODS Middle cerebral artery occlusion (MCAO) was performed on C57BL mice and GTA was gavage administrated (4 g/kg) on day 2 and 4 after MCAO. Lipogenesis was evaluated by assessment of the protein level of FASN, lipid droplets, and fatty acid products through liquid chromatography-mass spectrometry in the peri-infarct area on day 3 after MCAO, respectively. BBB permeability was determined by extravasation of Evans blue, IgG and dextran, and levels of tight junction proteins in the peri-infarct area on day 7 after MCAO, respectively. Infarct size and neurological defects were assessed on day 7 after MCAO. Brain atrophy on day 30 and long-term sensorimotor abilities after MCAO were analyzed as well. The inhibitor of FASN, C75 and the virus-delivered FASN shRNA were used to evaluate the role of FASN-driven lipogenesis in GTA-improved BBB repair. Finally, the therapeutic potential of recombinant IL-33 on BBB repair and neurological recovery was evaluated. RESULTS We found that treatment with GTA increased the lipogenesis as evidenced by lipid droplets level and lauric acid content, but not the FASN protein level. Treatment with GTA increased the IL-33 level in the peri-infarct area and decreased the BBB permeability after MCAO. However, infarct size and neurological defect score were unchanged on day 7 after MCAO, while the long-term recovery of sensorimotor function and brain atrophy were improved by GTA. Inhibition of lipogenesis using C75 or FASN shRNA reversed the beneficial effect of GTA. Finally, exogenous IL-33 improved BBB repair and long-term functional recovery after stroke. CONCLUSION Collectively, we concluded that treatment with GTA improved the BBB repair and functional recovery after ischemic stroke, probably by the enhancement of lipogenesis and IL-33 expression.
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Affiliation(s)
- Haidong Wei
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Luming Zhen
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Shiquan Wang
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, Shaanxi, China
| | - Liufei Yang
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Shuyue Zhang
- Department of Anesthesiology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, Shaanxi, China
| | - Yuanyuan Zhang
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Pengyu Jia
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Tianyue Wang
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Kui Wang
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Yan Zhang
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Lei Ma
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Jianrui Lv
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Pengbo Zhang
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China.
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19
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Garcia Corrales AV, Verberk SGS, Haidar M, Grajchen E, Dehairs J, Vanherle S, Loix M, Weytjens T, Gervois P, Matsuzaka T, Lambrichts I, Swinnen JV, Bogie JFJ, Hendriks JJA. Fatty acid elongation by ELOVL6 hampers remyelination by promoting inflammatory foam cell formation during demyelination. Proc Natl Acad Sci U S A 2023; 120:e2301030120. [PMID: 37669365 PMCID: PMC10500284 DOI: 10.1073/pnas.2301030120] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Accepted: 07/24/2023] [Indexed: 09/07/2023] Open
Abstract
A hallmark of multiple sclerosis (MS) is the formation of multiple focal demyelinating lesions within the central nervous system (CNS). These lesions mainly consist of phagocytes that play a key role in lesion progression and remyelination, and therefore represent a promising therapeutic target in MS. We recently showed that unsaturated fatty acids produced by stearoyl-CoA desaturase-1 induce inflammatory foam cell formation during demyelination. These fatty acids are elongated by the "elongation of very long chain fatty acids" proteins (ELOVLs), generating a series of functionally distinct lipids. Here, we show that the expression and activity of ELOVLs are altered in myelin-induced foam cells. Especially ELOVL6, an enzyme responsible for converting saturated and monounsaturated C16 fatty acids into C18 species, was found to be up-regulated in myelin phagocytosing phagocytes in vitro and in MS lesions. Depletion of Elovl6 induced a repair-promoting phagocyte phenotype through activation of the S1P/PPARγ pathway. Elovl6-deficient foamy macrophages showed enhanced ABCA1-mediated lipid efflux, increased production of neurotrophic factors, and reduced expression of inflammatory mediators. Moreover, our data show that ELOVL6 hampers CNS repair, as Elovl6 deficiency prevented demyelination and boosted remyelination in organotypic brain slice cultures and the mouse cuprizone model. These findings indicate that targeting ELOVL6 activity may be an effective strategy to stimulate CNS repair in MS and other neurodegenerative diseases.
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Affiliation(s)
- Aida V. Garcia Corrales
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
| | - Sanne G. S. Verberk
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
| | - Mansour Haidar
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
| | - Elien Grajchen
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
| | - Jonas Dehairs
- Department of Oncology, Laboratory of Lipid Metabolism and Cancer, Leuven Cancer Institute, University of Leuven, Leuven3000, Belgium
| | - Sam Vanherle
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
| | - Melanie Loix
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
| | - Tine Weytjens
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
| | - Pascal Gervois
- Department of Cardiology and Organ Systems, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
| | - Takashi Matsuzaka
- Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki305-8575, Japan
| | - Ivo Lambrichts
- Department of Cardiology and Organ Systems, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
| | - Johannes V. Swinnen
- Department of Oncology, Laboratory of Lipid Metabolism and Cancer, Leuven Cancer Institute, University of Leuven, Leuven3000, Belgium
| | - Jeroen F. J. Bogie
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
| | - Jerome J. A. Hendriks
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek3590, Belgium
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20
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Lin JB, Mora A, Wang TJ, Santeford A, Usmani D, Ligon MM, Mysorekar IU, Apte RS. Loss of stearoyl-CoA desaturase 2 disrupts inflammatory response in macrophages. mBio 2023; 14:e0092523. [PMID: 37417745 PMCID: PMC10470784 DOI: 10.1128/mbio.00925-23] [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: 05/01/2023] [Accepted: 05/15/2023] [Indexed: 07/08/2023] Open
Abstract
Macrophages are innate immune cells that patrol tissues and are the first responders to detect infection. They orchestrate the host immune response in eliminating invading pathogens and the subsequent transition from inflammation to tissue repair. Macrophage dysfunction contributes to age-related pathologies, including low-grade inflammation in advanced age that is termed "inflammaging." Our laboratory has previously identified that macrophage expression of a fatty acid desaturase, stearoyl-CoA desaturase 2 (SCD2), declines with age. Herein, we delineate the precise cellular effects of SCD2 deficiency in murine macrophages. We found that deletion of Scd2 from macrophages dysregulated basal and bacterial lipopolysaccharide (LPS)-stimulated transcription of numerous inflammation-associated genes. Specifically, deletion of Scd2 from macrophages decreased basal and LPS-induced expression of Il1b transcript that corresponded to decreased production of precursor IL1B protein and release of mature IL1B. Furthermore, we identified disruptions in autophagy and depletion of unsaturated cardiolipins in SCD2-deficient macrophages. To assess the functional relevance of SCD2 in the macrophage response to infection, we challenged SCD2-deficient macrophages with uropathogenic Escherichia coli and found that there was impaired clearance of intracellular bacteria. This increased burden of intracellular bacteria was accompanied by increased release of pro-inflammatory cytokines IL6 and TNF but decreased IL1B. Taken together, these results indicate that macrophage expression of Scd2 is necessary for maintaining the macrophage response to inflammatory stimuli. This link between fatty acid metabolism and fundamental macrophage effector functions may potentially be relevant to diverse age-related pathologies. IMPORTANCE Macrophages are immune cells that respond to infection, but their dysfunction is implicated in many age-related diseases. Recent evidence showed that macrophage expression of a fatty acid enzyme, stearoyl-CoA desaturase 2, declines in aged organisms. In this work, we characterize the effects when stearoyl-CoA desaturase 2 is deficient in macrophages. We identify aspects of the macrophage inflammatory response to infection that may be affected when expression of a key fatty acid enzyme is decreased, and these findings may provide cellular insight into how macrophages contribute to age-related diseases.
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Affiliation(s)
- Joseph B. Lin
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, USA
- Neurosciences Graduate Program, Roy and Diana Vagelos Division of Biology & Biomedical Sciences, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Amy Mora
- Department of Obstetrics & Gynecology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Tzu Jui Wang
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Andrea Santeford
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Darksha Usmani
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Marianne M. Ligon
- Department of Obstetrics & Gynecology, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Indira U. Mysorekar
- Department of Obstetrics & Gynecology, Washington University School of Medicine, St. Louis, Missouri, USA
- Department of Medicine, Section of Infectious Diseases, Baylor College of Medicine, Houston, Texas, USA
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas, USA
| | - Rajendra S. Apte
- John F. Hardesty, MD Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, USA
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, USA
- Center of Regenerative Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
- Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
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21
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Gu YY, Cui XB, Jiang J, Zhang YX, Liu MH, Cheng SB, Li YY, Liu LL, Liao RX, Zhao P, Jin W, Jia YH, Wang J, Zhou FH. Dingxin recipe Ⅲ ameliorates hyperlipidemia injury in SD rats by improving the gut barrier, particularly the SCFAs/GPR43 pathway. JOURNAL OF ETHNOPHARMACOLOGY 2023; 312:116483. [PMID: 37059245 DOI: 10.1016/j.jep.2023.116483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 04/03/2023] [Accepted: 04/09/2023] [Indexed: 05/08/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Dingxin Recipe Ⅲ (DXR Ⅲ) is a traditional Chinese medicine compound used for hyperlipidemia treatment in clinical practice. However, its curative effects and pharmacological mechanisms in hyperlipidemia have not been clarified to date. AIM OF THE STUDY Studies have demonstrated that gut barrier was strongly implicated in lipid deposition. Based on gut barrier and lipid metabolism, this study examined the effects and molecular mechanisms of DXR Ⅲ in hyperlipidemia. MATERIALS AND METHODS The bioactive compounds of DXR Ⅲ were detected by ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry, and its effects were evaluated in high-fat diet-fed rats. Specifically, the serum levels of lipids and hepatic enzymes were measured using the appropriate kits; colon and liver sections were obtained for histological analyses; gut microbiota and metabolites were analyzed by 16S rDNA sequencing and liquid chromatography-MS/MS; and the expression of genes and proteins was determined by real-time quantitative polymerase chain reaction and western blotting and immunohistochemistry, respectively. The pharmacological mechanisms of DXR Ⅲ were further explored by fecal microbiota transplantation and short-chain fatty acid (SCFAs)-based interventions. RESULTS DXR Ⅲ treatment significantly downregulated serum lipid levels, mitigated hepatocyte steatosis and improved lipid metabolism. Moreover, DXR Ⅲ improved the gut barrier, specifically by improving the physical barrier in the colon, causing part composition changes in the gut microbiota, and increasing the serum SCFAs level. DXR Ⅲ also upregulated the expression of colon GPR43/GPR109A. Fecal microbiota transplantation from rats treated with DXR Ⅲ downregulated part hyperlipidemia-related phenotypes, while the SCFAs intervention significantly improved most of the hyperlipidemia-related phenotypes and upregulated the expression of GPR43. Moreover, both DXR Ⅲ and SCFAs upregulated the expression of colon ABCA1. CONCLUSION DXR Ⅲ protects against hyperlipidemia by improving the gut barrier, particularly the SCFAs/GPR43 pathway.
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Affiliation(s)
- Yu-Yan Gu
- Third Level Research Laboratory of State Administration of Traditional Chinese Medicine, School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, China; School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, China
| | - Xiao-Bing Cui
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510405, China; Department of Cardiology, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510315, China
| | - Jing Jiang
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, China
| | - Ya-Xin Zhang
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, China
| | - Meng-Hua Liu
- School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Sai-Bo Cheng
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, China
| | - Yu-Ye Li
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, China
| | - Lin-Ling Liu
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, China
| | - Rong-Xin Liao
- Center of TCM Preventive Treatment, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510315, China
| | - Peng Zhao
- Center of TCM Preventive Treatment, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510315, China
| | - Wen Jin
- Department of Cardiac Intensive Care Unit, Cardiovascular Hospital, Guangdong Second Provincial General Hospital, Guangzhou, 510317, China
| | - Yu-Hua Jia
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, China.
| | - Jing Wang
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, China.
| | - Feng-Hua Zhou
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510515, China; Center of TCM Preventive Treatment, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510315, China.
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22
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Müller MA, Zweig N, Spengler B, Weinert M, Heiles S. Lipid Signatures and Inter-Cellular Heterogeneity of Naı̈ve and Lipopolysaccharide-Stimulated Human Microglia-like Cells. Anal Chem 2023; 95:11672-11679. [PMID: 37506282 DOI: 10.1021/acs.analchem.3c01533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
Microglia are non-neuronal cells, which reside in the central nervous system and are known to play an important role in health and disease. We investigated the lipidomic phenotypes of human naı̈ve and stimulated microglia-like cells by atmospheric-pressure scanning microprobe matrix-assisted laser desorption/ionization mass spectrometry imaging (AP-SMALDI MSI). With lateral resolutions between 5 and 1.5 μm pixel size, we were able to chart lipid compositions of individual cells, enabling differentiation of cell lines and stimulation conditions. This allowed us to reveal local lipid heterogeneities in naı̈ve and lipopolysaccharide (LPS)-stimulated cells. We were able to identify individual cells with elevated triglyceride (TG) levels and could show that the number of these TG-enriched cells increased with LPS stimulation as a hallmark for a proinflammatory phenotype. Additionally, the observed local abundance alterations of specific phosphatidylinositols (PIs) indicate a cell specific regulation of the PI metabolism.
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Affiliation(s)
- Max A Müller
- Institute of Inorganic and Analytical Chemistry, Analytical Chemistry, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Norman Zweig
- Institute of Inorganic and Analytical Chemistry, Analytical Chemistry, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Bernhard Spengler
- Institute of Inorganic and Analytical Chemistry, Analytical Chemistry, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Maria Weinert
- Department of Brain Sciences, Imperial College London, Hammersmith Hospital, W12 0NN London, U.K
| | - Sven Heiles
- Institute of Inorganic and Analytical Chemistry, Analytical Chemistry, Justus Liebig University Giessen, 35392 Giessen, Germany
- Leibniz-Institut für Analytische Wissenschaften─ISAS─e.V., 44139 Dortmund, Germany
- Faculty of Chemistry, University of Duisburg-Essen, 45141 Essen, Germany
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23
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Bombarda-Rocha V, Silva D, Badr-Eddine A, Nogueira P, Gonçalves J, Fresco P. Challenges in Pharmacological Intervention in Perilipins (PLINs) to Modulate Lipid Droplet Dynamics in Obesity and Cancer. Cancers (Basel) 2023; 15:4013. [PMID: 37568828 PMCID: PMC10417315 DOI: 10.3390/cancers15154013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 08/01/2023] [Accepted: 08/04/2023] [Indexed: 08/13/2023] Open
Abstract
Perilipins (PLINs) are the most abundant proteins in lipid droplets (LD). These LD-associated proteins are responsible for upgrading LD from inert lipid storage structures to fully functional organelles, fundamentally integrated in the lipid metabolism. There are five distinct perilipins (PLIN1-5), each with specific expression patterns and metabolic activation, but all capable of regulating the activity of lipases on LD. This plurality creates a complex orchestrated mechanism that is directly related to the healthy balance between lipogenesis and lipolysis. Given the essential role of PLINs in the modulation of the lipid metabolism, these proteins can become interesting targets for the treatment of lipid-associated diseases. Since reprogrammed lipid metabolism is a recognized cancer hallmark, and obesity is a known risk factor for cancer and other comorbidities, the modulation of PLINs could either improve existing treatments or create new opportunities for the treatment of these diseases. Even though PLINs have not been, so far, directly considered for pharmacological interventions, there are many established drugs that can modulate PLINs activity. Therefore, the aim of this study is to assess the involvement of PLINs in diseases related to lipid metabolism dysregulation and whether PLINs can be viewed as potential therapeutic targets for cancer and obesity.
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Affiliation(s)
- Victória Bombarda-Rocha
- Laboratory of Pharmacology, Department of Drug Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal; (V.B.-R.); (D.S.); (A.B.-E.); (P.N.); (P.F.)
- UCIBIO–Applied Molecular Biosciences Unit, Associate Laboratory i4HB, Institute for Health and Bioeconomy, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal
| | - Dany Silva
- Laboratory of Pharmacology, Department of Drug Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal; (V.B.-R.); (D.S.); (A.B.-E.); (P.N.); (P.F.)
- UCIBIO–Applied Molecular Biosciences Unit, Associate Laboratory i4HB, Institute for Health and Bioeconomy, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal
| | - Allal Badr-Eddine
- Laboratory of Pharmacology, Department of Drug Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal; (V.B.-R.); (D.S.); (A.B.-E.); (P.N.); (P.F.)
| | - Patrícia Nogueira
- Laboratory of Pharmacology, Department of Drug Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal; (V.B.-R.); (D.S.); (A.B.-E.); (P.N.); (P.F.)
- UCIBIO–Applied Molecular Biosciences Unit, Associate Laboratory i4HB, Institute for Health and Bioeconomy, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal
| | - Jorge Gonçalves
- Laboratory of Pharmacology, Department of Drug Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal; (V.B.-R.); (D.S.); (A.B.-E.); (P.N.); (P.F.)
- UCIBIO–Applied Molecular Biosciences Unit, Associate Laboratory i4HB, Institute for Health and Bioeconomy, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal
| | - Paula Fresco
- Laboratory of Pharmacology, Department of Drug Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal; (V.B.-R.); (D.S.); (A.B.-E.); (P.N.); (P.F.)
- UCIBIO–Applied Molecular Biosciences Unit, Associate Laboratory i4HB, Institute for Health and Bioeconomy, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal
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24
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Hu M, Li T, Ma X, Liu S, Li C, Huang Z, Lin Y, Wu R, Wang S, Lu D, Lu T, Men X, Shen S, Huang H, Liu Y, Song K, Jian B, Jiang Y, Qiu W, Liu Q, Lu Z, Cai W. Macrophage lineage cells-derived migrasomes activate complement-dependent blood-brain barrier damage in cerebral amyloid angiopathy mouse model. Nat Commun 2023; 14:3945. [PMID: 37402721 DOI: 10.1038/s41467-023-39693-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 06/16/2023] [Indexed: 07/06/2023] Open
Abstract
Accumulation of amyloid beta protein (Aβ) in brain vessels damages blood brain barrier (BBB) integrity in cerebral amyloid angiopathy (CAA). Macrophage lineage cells scavenge Aβ and produce disease-modifying mediators. Herein, we report that Aβ40-induced macrophage-derived migrasomes are sticky to blood vessels in skin biopsy samples from CAA patients and brain tissue from CAA mouse models (Tg-SwDI/B and 5xFAD mice). We show that CD5L is packed in migrasomes and docked to blood vessels, and that enrichment of CD5L impairs the resistance to complement activation. Increased migrasome-producing capacity of macrophages and membrane attack complex (MAC) in blood are associated with disease severity in both patients and Tg-SwDI/B mice. Of note, complement inhibitory treatment protects against migrasomes-mediated blood-brain barrier injury in Tg-SwDI/B mice. We thus propose that macrophage-derived migrasomes and the consequent complement activation are potential biomarkers and therapeutic targets in CAA.
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Affiliation(s)
- Mengyan Hu
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Guangzhou, 510630, China
- Center of Clinical Immunology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Tiemei Li
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Xiaomeng Ma
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Sanxin Liu
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Chunyi Li
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Zhenchao Huang
- Department of Neurosurgery, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510630, China
| | - Yinyao Lin
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Ruizhen Wu
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Shisi Wang
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Danli Lu
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Tingting Lu
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Xuejiao Men
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Shishi Shen
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Huipeng Huang
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Yuxin Liu
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Kangyu Song
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Banghao Jian
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Yuxuan Jiang
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Wei Qiu
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China
| | - Quentin Liu
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Guangzhou, 510060, China.
| | - Zhengqi Lu
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China.
| | - Wei Cai
- Department of Neurology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China.
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Guangzhou, 510630, China.
- Center of Clinical Immunology, Mental and Neurological Disease Research Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510630, China.
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Dixit A, Savage HS, Greer JM. An appraisal of emerging therapeutic targets for multiple sclerosis derived from current preclinical models. Expert Opin Ther Targets 2023; 27:553-574. [PMID: 37438986 DOI: 10.1080/14728222.2023.2236301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 07/09/2023] [Indexed: 07/14/2023]
Abstract
INTRODUCTION Multiple sclerosis (MS) is a chronic inflammatory, demyelinating, and neurodegenerative condition affecting the central nervous system (CNS). Although therapeutic approaches have become available over the last 20 years that markedly slow the progression of disease, there is no cure for MS. Furthermore, the capacity to repair existing CNS damage caused by MS remains very limited. AREAS COVERED Several animal models are widely used in MS research to identify potential druggable targets for new treatment of MS. In this review, we look at targets identified since 2019 in studies using these models, and their potential for effecting a cure for MS. EXPERT OPINION Refinement of therapeutic strategies targeting key molecules involved in the activation of immune cells, cytokine, and chemokine signaling, and the polarization of the immune response have dominated recent publications. While some progress has been made in identifying effective targets to combat chronic demyelination and neurodegeneration, much more work is required. Progress is largely limited by the gaps in knowledge of how the immune system and the nervous system interact in MS and its animal models, and whether the numerous targets present in both systems respond in the same way in each system to the same therapeutic manipulation.
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Affiliation(s)
- Aakanksha Dixit
- The University of Queensland, UQ Centre for Clinical Research, Royal Brisbane & Women's Hospita, Brisbane, QLD, Australia
| | - Hannah S Savage
- The University of Queensland, UQ Centre for Clinical Research, Royal Brisbane & Women's Hospita, Brisbane, QLD, Australia
| | - Judith M Greer
- The University of Queensland, UQ Centre for Clinical Research, Royal Brisbane & Women's Hospita, Brisbane, QLD, Australia
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Abstract
Niacin (vitamin B3) is an essential nutrient that treats pellagra, and prior to the advent of statins, niacin was commonly used to counter dyslipidemia. Recent evidence has posited niacin as a promising therapeutic for several neurological disorders. In this review, we discuss the biochemistry of niacin, including its homeostatic roles in NAD+ supplementation and metabolism. Niacin also has roles outside of metabolism, largely through engaging hydroxycarboxylic acid receptor 2 (Hcar2). These receptor-mediated activities of niacin include regulation of immune responses, phagocytosis of myelin debris after demyelination or of amyloid beta in models of Alzheimer's disease, and cholesterol efflux from cells. We describe the neurological disorders in which niacin has been investigated or has been proposed as a candidate medication. These are multiple sclerosis, Alzheimer's disease, Parkinson's disease, glioblastoma and amyotrophic lateral sclerosis. Finally, we explore the proposed mechanisms through which niacin may ameliorate neuropathology. While several questions remain, the prospect of niacin as a therapeutic to alleviate neurological impairment is promising.
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Affiliation(s)
- Emily Wuerch
- Hotchkiss Brain Institute, 3330 Hospital Drive NW, Calgary, AB, Canada
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Gloria Roldan Urgoiti
- Hotchkiss Brain Institute, 3330 Hospital Drive NW, Calgary, AB, Canada
- Arnie Charbonneau Cancer Institute, Calgary, AB, Canada
- Department of Oncology, University of Calgary, Calgary, AB, Canada
| | - V Wee Yong
- Hotchkiss Brain Institute, 3330 Hospital Drive NW, Calgary, AB, Canada.
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada.
- Department of Oncology, University of Calgary, Calgary, AB, Canada.
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Distéfano-Gagné F, Bitarafan S, Lacroix S, Gosselin D. Roles and regulation of microglia activity in multiple sclerosis: insights from animal models. Nat Rev Neurosci 2023:10.1038/s41583-023-00709-6. [PMID: 37268822 DOI: 10.1038/s41583-023-00709-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/28/2023] [Indexed: 06/04/2023]
Abstract
As resident macrophages of the CNS, microglia are critical immune effectors of inflammatory lesions and associated neural dysfunctions. In multiple sclerosis (MS) and its animal models, chronic microglial inflammatory activity damages myelin and disrupts axonal and synaptic activity. In contrast to these detrimental effects, the potent phagocytic and tissue-remodelling capabilities of microglia support critical endogenous repair mechanisms. Although these opposing capabilities have long been appreciated, a precise understanding of their underlying molecular effectors is only beginning to emerge. Here, we review recent advances in our understanding of the roles of microglia in animal models of MS and demyelinating lesions and the mechanisms that underlie their damaging and repairing activities. We also discuss how the structured organization and regulation of the genome enables complex transcriptional heterogeneity within the microglial cell population at demyelinating lesions.
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Affiliation(s)
- Félix Distéfano-Gagné
- Axe Neuroscience, Centre de Recherche du CHU de Québec - Université Laval, Québec, Québec, Canada
- Département de Médecine Moléculaire de la Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Sara Bitarafan
- Axe Neuroscience, Centre de Recherche du CHU de Québec - Université Laval, Québec, Québec, Canada
- Département de Médecine Moléculaire de la Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Steve Lacroix
- Axe Neuroscience, Centre de Recherche du CHU de Québec - Université Laval, Québec, Québec, Canada
- Département de Médecine Moléculaire de la Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - David Gosselin
- Axe Neuroscience, Centre de Recherche du CHU de Québec - Université Laval, Québec, Québec, Canada.
- Département de Médecine Moléculaire de la Faculté de Médecine, Université Laval, Québec, Québec, Canada.
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28
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Jeon YG, Kim YY, Lee G, Kim JB. Physiological and pathological roles of lipogenesis. Nat Metab 2023; 5:735-759. [PMID: 37142787 DOI: 10.1038/s42255-023-00786-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 03/15/2023] [Indexed: 05/06/2023]
Abstract
Lipids are essential metabolites, which function as energy sources, structural components and signalling mediators. Most cells are able to convert carbohydrates into fatty acids, which are often converted into neutral lipids for storage in the form of lipid droplets. Accumulating evidence suggests that lipogenesis plays a crucial role not only in metabolic tissues for systemic energy homoeostasis but also in immune and nervous systems for their proliferation, differentiation and even pathophysiological roles. Thus, excessive or insufficient lipogenesis is closely associated with aberrations in lipid homoeostasis, potentially leading to pathological consequences, such as dyslipidaemia, diabetes, fatty liver, autoimmune diseases, neurodegenerative diseases and cancers. For systemic energy homoeostasis, multiple enzymes involved in lipogenesis are tightly controlled by transcriptional and post-translational modifications. In this Review, we discuss recent findings regarding the regulatory mechanisms, physiological roles and pathological importance of lipogenesis in multiple tissues such as adipose tissue and the liver, as well as the immune and nervous systems. Furthermore, we briefly introduce the therapeutic implications of lipogenesis modulation.
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Affiliation(s)
- Yong Geun Jeon
- Center for Adipocyte Structure and Function, Institute of Molecular Biology and Genetics, School of Biological Sciences, Seoul National University, Seoul, South Korea
| | - Ye Young Kim
- Center for Adipocyte Structure and Function, Institute of Molecular Biology and Genetics, School of Biological Sciences, Seoul National University, Seoul, South Korea
| | - Gung Lee
- Center for Adipocyte Structure and Function, Institute of Molecular Biology and Genetics, School of Biological Sciences, Seoul National University, Seoul, South Korea
| | - Jae Bum Kim
- Center for Adipocyte Structure and Function, Institute of Molecular Biology and Genetics, School of Biological Sciences, Seoul National University, Seoul, South Korea.
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29
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Klotz L, Antel J, Kuhlmann T. Inflammation in multiple sclerosis: consequences for remyelination and disease progression. Nat Rev Neurol 2023; 19:305-320. [PMID: 37059811 DOI: 10.1038/s41582-023-00801-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/15/2023] [Indexed: 04/16/2023]
Abstract
Despite the large number of immunomodulatory or immunosuppressive treatments available to treat relapsing-remitting multiple sclerosis (MS), treatment of the progressive phase of the disease has not yet been achieved. This lack of successful treatment approaches is caused by our poor understanding of the mechanisms driving disease progression. Emerging concepts suggest that a combination of persisting focal and diffuse inflammation within the CNS and a gradual failure of compensatory mechanisms, including remyelination, result in disease progression. Therefore, promotion of remyelination presents a promising intervention approach. However, despite our increasing knowledge regarding the cellular and molecular mechanisms regulating remyelination in animal models, therapeutic increases in remyelination remain an unmet need in MS, which suggests that mechanisms of remyelination and remyelination failure differ fundamentally between humans and demyelinating animal models. New and emerging technologies now allow us to investigate the cellular and molecular mechanisms underlying remyelination failure in human tissue samples in an unprecedented way. The aim of this Review is to summarize our current knowledge regarding mechanisms of remyelination and remyelination failure in MS and in animal models of the disease, identify open questions, challenge existing concepts, and discuss strategies to overcome the translational roadblock in the field of remyelination-promoting therapies.
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Affiliation(s)
- Luisa Klotz
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Jack Antel
- Neuroimmunology Unit, Montreal Neurological Institute, McGill University, Québec, Canada
| | - Tanja Kuhlmann
- Neuroimmunology Unit, Montreal Neurological Institute, McGill University, Québec, Canada.
- Institute of Neuropathology, University Hospital Münster, Münster, Germany.
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30
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Cai W, Hu M, Li C, Wu R, Lu D, Xie C, Zhang W, Li T, Shen S, Huang H, Qiu W, Liu Q, Lu Y, Lu Z. FOXP3+ macrophage represses acute ischemic stroke-induced neural inflammation. Autophagy 2023; 19:1144-1163. [PMID: 36170234 PMCID: PMC10012925 DOI: 10.1080/15548627.2022.2116833] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 08/19/2022] [Accepted: 08/19/2022] [Indexed: 11/02/2022] Open
Abstract
Proper termination of cell-death-induced neural inflammation is the premise of tissue repair in acute ischemic stroke (AIS). Macrophages scavenge cell corpses/debris and produce inflammatory mediators that orchestrate immune responses. Here, we report that FOXP3, the key immune-repressive transcription factor of Tregs, is conditionally expressed in macrophages in stroke lesion. FOXP3 ablation in macrophages results in detrimental stroke outcomes, emphasizing the beneficial role of FOXP3+ macrophages. FOXP3+ macrophages are distinct from the M1 or M2 subsets and display superactive efferocytic capacity. With scRNAseq and analysis of FOXP3-bound-DNA isolated with CUT & RUN, we show that FOXP3 facilitates macrophage phagocytosis through enhancing cargo metabolism. FOXP3 expression is controlled by macroautophagic/autophagic protein degradation in resting macrophages, while initiation of LC3-associated phagocytosis (LAP) competitively occupies the autophagic machineries, and thus permits FOXP3 activation. Our data demonstrate a distinct set of FOXP3+ macrophages with enhanced scavenging capability, which could be a target in immunomodulatory therapy against AIS.Abbreviations: ADGRE1/F4/80: adhesion G protein-coupled receptor E1; AIF1/Iba1: allograft inflammatory factor 1; AIS: acute ischemic stroke; ARG1: arginase 1; ATP: adenosine triphosphate; BECN1/Beclin1: Beclin 1, autophagy related; BMDM: bone marrow-derived macrophages; CKO: conditional knockout; CSF1/M-CSF: colony stimulating factor 1 (macrophage); CSF2/GM-CSF: colony stimulating factor 2; CSF3/G-CSF: colony stimulating factor 3; CUT & RUN: cleavage under targets and release using nuclease; CyD: cytochalasin D; DAMP: danger/damage-associated molecular pattern; DIL: dioctadecyl-3,3,3,3-tetramethylin docarbocyanine; ELISA: enzyme linked immunosorbent assay; GO: Gene Ontology; FCGR3/CD16: Fc receptor, IgG, low affinity III; HMGB1: high mobility group box 1; IFNG/IFNγ: interferon gamma; IP: immunoprecipitation; KEGG: Kyoto Encyclopedia of Genes and Genomes; ITGAM/CD11b: integrin subunit alpha M; ITGAX/CD11c: integrin subunit alpha X; LAP: LC3-associated phagocytosis; LC-MS: liquid chromatography-mass spectrometry; LPS: lipopolysaccharide; MRC1/CD206: mannose receptor, C type 1; O4: oligodendrocyte marker O4; PBMC: peripheral blood mononuclear cells; RBC: red blood cells; PTPRC/CD45: protein tyrosine phosphatase, receptor type, C; RBFOX3/NeuN: RNA binding protein, fox 1 homolog (C. elegans) 3; RUBCN/Rubicon: RUN domain and cysteine-rich domain containing, Beclin 1-interacting protein; scRNAseq: single cell RNA sequencing; SQSTM1/p62 (sequestosome 1); TGFB/TGFβ: transforming growth factor, beta; tMCAO: transient middle cerebral artery occlusion; TNF/TNFα: tumor necrosis factor; Treg: regulatory T cell.
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Affiliation(s)
- Wei Cai
- Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Mengyan Hu
- Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Chunyi Li
- Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Ruizhen Wu
- Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Danli Lu
- Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Chichu Xie
- Center of Clinical Immunology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Wei Zhang
- Center of Clinical Immunology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Tiemei Li
- Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Shishi Shen
- Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Huipeng Huang
- Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Wei Qiu
- Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Quentin Liu
- State Key Laboratory of Oncology in South China, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Yan Lu
- Center of Clinical Immunology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Zhengqi Lu
- Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
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Goffin N, Buache E, Charpentier C, Lehrter V, Morjani H, Gobinet C, Piot O. Trajectory Inference for Unraveling Dynamic Biological Processes from Raman Spectral Data. Anal Chem 2023; 95:4395-4403. [PMID: 36788139 DOI: 10.1021/acs.analchem.2c04901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Cell heterogeneity is a crucial parameter for understanding the complexity of numerous biomedical issues. Trajectory inference-based approaches are recent tools developed for single-cell transcriptomics (scRNA-seq) data analysis. They aim to reconstruct evolving pathways from the variety of cell states that coexist simultaneously in a cell population. We propose to expand this concept to Raman spectroscopy, a label-free modality that probes the global molecular nature of a sample, by investigating the dynamics of adipocyte differentiation.
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Affiliation(s)
- Nicolas Goffin
- University of Reims Champagne Ardenne, BioSpecT EA 7506, SFR Santé, France
| | - Emilie Buache
- University of Reims Champagne Ardenne, BioSpecT EA 7506, SFR Santé, France
| | - Celine Charpentier
- University of Reims Champagne Ardenne, BioSpecT EA 7506, SFR Santé, France
| | - Véronique Lehrter
- University of Reims Champagne Ardenne, BioSpecT EA 7506, SFR Santé, France
| | - Hamid Morjani
- University of Reims Champagne Ardenne, BioSpecT EA 7506, SFR Santé, France
| | - Cyril Gobinet
- University of Reims Champagne Ardenne, BioSpecT EA 7506, SFR Santé, France
| | - Olivier Piot
- University of Reims Champagne Ardenne, BioSpecT EA 7506, SFR Santé, France.,University of Reims Champagne Ardenne, Platform of Cellular and Tissular Imaging (PICT) EA 7506, SFR Santé, France
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32
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Moore JM, Bell EL, Hughes RO, Garfield AS. ABC transporters: human disease and pharmacotherapeutic potential. Trends Mol Med 2023; 29:152-172. [PMID: 36503994 DOI: 10.1016/j.molmed.2022.11.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/24/2022] [Accepted: 11/01/2022] [Indexed: 12/12/2022]
Abstract
Adenosine triphosphate (ATP)-binding cassette (ABC) transporters are a 48-member superfamily of membrane proteins that actively transport a variety of biological substrates across lipid membranes. Their functional diversity defines an expansive involvement in myriad aspects of human biology. At least 21 ABC transporters underlie rare monogenic disorders, with even more implicated in the predisposition to and symptomology of common and complex diseases. Such broad (patho)physiological relevance places this class of proteins at the intersection of disease causation and therapeutic potential, underlining them as promising targets for drug discovery, as exemplified by the transformative CFTR (ABCC7) modulator therapies for cystic fibrosis. This review will explore the growing relevance of ABC transporters to human disease and their potential as small-molecule drug targets.
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The role of ApoE-mediated microglial lipid metabolism in brain aging and disease. IMMUNOMETABOLISM (COBHAM (SURREY, ENGLAND)) 2023; 5:e00018. [PMID: 36710921 PMCID: PMC9869962 DOI: 10.1097/in9.0000000000000018] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 12/20/2022] [Indexed: 01/31/2023]
Abstract
Microglia are a unique population of immune cells resident in the brain that integrate complex signals and dynamically change phenotypes in response to the brain microenvironment. In recent years, single-cell sequencing analyses have revealed profound cellular heterogeneity and context-specific transcriptional plasticity of microglia during brain development, aging, and disease. Emerging evidence suggests that microglia adapt phenotypic plasticity by flexibly reprogramming cellular metabolism to fulfill distinct immune functions. The control of lipid metabolism is central to the appropriate function and homeostasis of the brain. Microglial lipid metabolism regulated by apolipoprotein E (ApoE), a crucial lipid transporter in the brain, has emerged as a critical player in regulating neuroinflammation. The ApoE gene allelic variant, ε4, is associated with a greater risk for neurodegenerative diseases. In this review, we explore novel discoveries in microglial lipid metabolism mediated by ApoE. We elaborate on the functional impact of perturbed microglial lipid metabolism on the underlying pathogenesis of brain aging and disease.
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34
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Staged suppression of microglial autophagy facilitates regeneration in CNS demyelination by enhancing the production of linoleic acid. Proc Natl Acad Sci U S A 2023; 120:e2209990120. [PMID: 36577069 PMCID: PMC9910603 DOI: 10.1073/pnas.2209990120] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Microglia play a critical role in the clearance of myelin debris, thereby ensuring functional recovery from neural injury. Here, using mouse model of demyelination following two-point LPC injection, we show that the microglial autophagic-lysosomal pathway becomes overactivated in response to severe demyelination, leading to lipid droplet accumulation and a dysfunctional and pro-inflammatory microglial state, and finally failed myelin debris clearance and spatial learning deficits. Data from genetic approaches and pharmacological modulations, via microglial Atg5 deficient mice and intraventricular BAF A1 administration, respectively, demonstrate that staged suppression of excessive autophagic-lysosomal activation in microglia, but not sustained inhibition, results in better myelin debris degradation and exerts protective effects against demyelination. Combined multi-omics results in vitro further showed that enhanced lipid metabolism, especially the activation of the linoleic acid pathway, underlies this protective effect. Supplementation with conjugated linoleic acid (CLA), both in vivo and in vitro, could mimic these effects, including attenuating inflammation and restoring microglial pro-regenerative properties, finally resulting in better recovery from demyelination injuries and improved spatial learning function, by activating the peroxisome proliferator-activated receptor (PPAR-γ) pathway. Therefore, we propose that pharmacological inhibition targeting microglial autophagic-lysosomal overactivation or supplementation with CLA could represent a potential therapeutic strategy in demyelinated disorders.
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35
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Raas Q, Tawbeh A, Tahri-Joutey M, Gondcaille C, Keime C, Kaiser R, Trompier D, Nasser B, Leoni V, Bellanger E, Boussand M, Hamon Y, Benani A, Di Cara F, Truntzer C, Cherkaoui-Malki M, Andreoletti P, Savary S. Peroxisomal defects in microglial cells induce a disease-associated microglial signature. Front Mol Neurosci 2023; 16:1170313. [PMID: 37138705 PMCID: PMC10149961 DOI: 10.3389/fnmol.2023.1170313] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 03/27/2023] [Indexed: 05/05/2023] Open
Abstract
Microglial cells ensure essential roles in brain homeostasis. In pathological condition, microglia adopt a common signature, called disease-associated microglial (DAM) signature, characterized by the loss of homeostatic genes and the induction of disease-associated genes. In X-linked adrenoleukodystrophy (X-ALD), the most common peroxisomal disease, microglial defect has been shown to precede myelin degradation and may actively contribute to the neurodegenerative process. We previously established BV-2 microglial cell models bearing mutations in peroxisomal genes that recapitulate some of the hallmarks of the peroxisomal β-oxidation defects such as very long-chain fatty acid (VLCFA) accumulation. In these cell lines, we used RNA-sequencing and identified large-scale reprogramming for genes involved in lipid metabolism, immune response, cell signaling, lysosome and autophagy, as well as a DAM-like signature. We highlighted cholesterol accumulation in plasma membranes and observed autophagy patterns in the cell mutants. We confirmed the upregulation or downregulation at the protein level for a few selected genes that mostly corroborated our observations and clearly demonstrated increased expression and secretion of DAM proteins in the BV-2 mutant cells. In conclusion, the peroxisomal defects in microglial cells not only impact on VLCFA metabolism but also force microglial cells to adopt a pathological phenotype likely representing a key contributor to the pathogenesis of peroxisomal disorders.
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Affiliation(s)
- Quentin Raas
- Laboratoire Bio-PeroxIL EA7270, University of Bourgogne, Dijon, France
| | - Ali Tawbeh
- Laboratoire Bio-PeroxIL EA7270, University of Bourgogne, Dijon, France
| | - Mounia Tahri-Joutey
- Laboratoire Bio-PeroxIL EA7270, University of Bourgogne, Dijon, France
- Laboratory of Biochemistry, Neurosciences, Natural Resources and Environment, Faculty of Sciences and Techniques, University Hassan I, Settat, Morocco
| | | | - Céline Keime
- Plateforme GenomEast, IGBMC, CNRS UMR 7104, Inserm U1258, University of Strasbourg, Illkirch, France
| | - Romain Kaiser
- Plateforme GenomEast, IGBMC, CNRS UMR 7104, Inserm U1258, University of Strasbourg, Illkirch, France
| | - Doriane Trompier
- Laboratoire Bio-PeroxIL EA7270, University of Bourgogne, Dijon, France
| | - Boubker Nasser
- Laboratory of Biochemistry, Neurosciences, Natural Resources and Environment, Faculty of Sciences and Techniques, University Hassan I, Settat, Morocco
| | - Valerio Leoni
- Laboratory of Clinical Biochemistry, Hospital of Desio, ASST-Brianza and Department of Medicine and Surgery, University of Milano-Bicocca, Monza, Italy
| | - Emma Bellanger
- Aix Marseille Univ, CNRS, INSERM, CIML, Marseille, France
| | - Maud Boussand
- Aix Marseille Univ, CNRS, INSERM, CIML, Marseille, France
| | - Yannick Hamon
- Aix Marseille Univ, CNRS, INSERM, CIML, Marseille, France
| | - Alexandre Benani
- Centre des Sciences du Goût et de l’Alimentation, CNRS, INRAE, Institut Agro Dijon, University of Bourgogne Franche-Comté, Dijon, France
| | - Francesca Di Cara
- Department of Microbiology and Immunology, IWK Health Centre, Dalhousie University, Halifax, NS, Canada
| | - Caroline Truntzer
- Platform of Transfer in Biological Oncology, Georges François Leclerc Cancer Center–Unicancer, Dijon, France
| | | | | | - Stéphane Savary
- Laboratoire Bio-PeroxIL EA7270, University of Bourgogne, Dijon, France
- *Correspondence: Stéphane Savary,
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Yang D, Wang X, Zhang L, Fang Y, Zheng Q, Liu X, Yu W, Chen S, Ying J, Hua F. Lipid metabolism and storage in neuroglia: role in brain development and neurodegenerative diseases. Cell Biosci 2022; 12:106. [PMID: 35831869 PMCID: PMC9277953 DOI: 10.1186/s13578-022-00828-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 06/05/2022] [Indexed: 11/13/2022] Open
Abstract
The importance of neuroglia in maintaining normal brain function under physiological and pathological conditions has been supported by growing evidence in recent years. The most important issues regarding glial metabolism and function include the cooperation between glial populations and neurons, morphological and functional changes in pathological states, and the role in the onset and progression of neurodegenerative diseases. Although lipid accumulation and further lipid droplet production in neurodegenerative disease brain models have been observed for a long time, the dynamic development of brain lipid droplet research in recent years suggests its role in the development and progression of neurodegenerative diseases was previously underestimated. First recognized as organelles of lipid storage, lipid droplets (LDs) have emerged as an important organelle in metabolic diseases, inflammation, and host defense. Dynamic changes in lipid metabolism within neurons and glial cells resulting in lipid accumulation and lipid droplet formation are present in brain models of various neurodegenerative diseases, yet their role in the brain remains largely unexplored. This paper first reviews the metabolism and accumulation of several major lipids in the brain and discusses the regulation of lipid accumulation in different types of brain cells. We explore the potential role of intracellular lipid accumulation in the pathogenesis of neurodegeneration, starting from lipid metabolism and LDs biogenesis in glial cells, and discuss several pathological factors that promote lipid droplet formation, mainly focusing on oxidative stress, energy metabolism and glial cell-neuron coupling, which are closely related to the etiology and progression of neurodegenerative diseases. Finally, the directions and challenges of intracellular lipid metabolism in glial cells in neurodegeneration are discussed.
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Shen S, Cheng X, Zhou L, Zhao Y, Wang H, Zhang J, Sun X, Wang Y, Shu Y, Xu Y, Tao Y, Li M, Lu Z, Cai W, Nie G, Qiu W. Neutrophil Nanovesicle Protects against Experimental Autoimmune Encephalomyelitis through Enhancing Myelin Clearance by Microglia. ACS NANO 2022; 16:18886-18897. [PMID: 36288210 DOI: 10.1021/acsnano.2c07798] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Timely clearance of myelin debris is the premise of neuroinflammation termination and tissue regeneration in multiple sclerosis (MS). Microglia are the main scavengers of myelin debris in MS lesions, but its phagocytic capability is limited in MS patients. Here, we develop neutrophil-derived nanovesicles (NNVs) to enhance the efficiency of myelin debris clearance in microglia for MS therapy. RNA sequencing (RNAseq) results demonstrate that NNVs treatment ameliorates lesional neuroinflammation of experimental autoimmune encephalomyelitis (EAE), a mouse model of MS. Consequently, EAE mice exhibit favorable neurological functions and white matter integrity after NNVs treatment. Specifically, NNVs treatment upregulates the expression of nuclear factor E2-related factor 2 (NRF2) in microglia, as revealed by Assay for Transposase Accessible Chromatin using sequencing (ATACseq). We also demonstrate that NRF2 can activate the transcription of RUBCN (RUN domain and cysteine-rich domain containing Beclin 1-interacting protein), which in turn enhances LC3-associated phagocytosis (LAP) in microglia. As a result, myelin debris engulfed by microglia can be efficiently catabolized in NNVs-treated EAE mice without obvious side effects. Together, this study proves that NNVs can modulate neuroinflammation by clearing myelin debris and is a promising MS treatment strategy.
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Affiliation(s)
- Shishi Shen
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China
- CAS Key Laboratory for Biomedical Effects of Nanomaterials & Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
| | - Xi Cheng
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China
| | - Luyao Zhou
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China
| | - Yipeng Zhao
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China
| | - Hai Wang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials & Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jie Zhang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials & Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
| | - Xiaobo Sun
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China
| | - Yuge Wang
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China
| | - Yaqing Shu
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China
| | - Yanteng Xu
- Laboratory of Biomaterials and Translational Medicine, Center for Nanomedicine, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou 510630, China
| | - Yu Tao
- Laboratory of Biomaterials and Translational Medicine, Center for Nanomedicine, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou 510630, China
| | - Mingqiang Li
- Laboratory of Biomaterials and Translational Medicine, Center for Nanomedicine, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou 510630, China
| | - Zhengqi Lu
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China
| | - Wei Cai
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China
| | - Guangjun Nie
- CAS Key Laboratory for Biomedical Effects of Nanomaterials & Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wei Qiu
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510000, China
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38
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Franklin RJM, Simons M. CNS remyelination and inflammation: From basic mechanisms to therapeutic opportunities. Neuron 2022; 110:3549-3565. [PMID: 36228613 DOI: 10.1016/j.neuron.2022.09.023] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 09/09/2022] [Accepted: 09/19/2022] [Indexed: 11/06/2022]
Abstract
Remyelination, the myelin regenerative response that follows demyelination, restores saltatory conduction and function and sustains axon health. Its declining efficiency with disease progression in the chronic autoimmune disease multiple sclerosis (MS) contributes to the currently untreatable progressive phase of the disease. Although some of the bona fide myelin regenerative medicine clinical trials have succeeded in demonstrating proof-of-principle, none of these compounds have yet proceeded toward approval. There therefore remains a need to increase our understanding of the fundamental biology of remyelination so that existing targets can be refined and new ones discovered. Here, we review the role of inflammation, in particular innate immunity, in remyelination, describing its many and complex facets and discussing how our evolving understanding can be harnessed to translational goals.
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Affiliation(s)
- Robin J M Franklin
- Altos Labs - Cambridge Institute of Science, Granta Park, Cambridge CB21 6GP, UK.
| | - Mikael Simons
- Institute of Neuronal Cell Biology, Technical University Munich, Munich, Germany; German Center for Neurodegenerative Diseases, Munich, Germany; Cluster of Systems Neurology (SyNergy), Munich, Germany; Institute for Stroke and Dementia Research, Munich, Germany.
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39
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Vanherle S, Jorissen W, Dierckx T, Loix M, Grajchen E, Mingneau F, Guns J, Gervois P, Lambrichts I, Dehairs J, Swinnen JV, Mulder MT, Remaley AT, Haidar M, Hendriks JJ, Bogie JJ. The ApoA-I mimetic peptide 5A enhances remyelination by promoting clearance and degradation of myelin debris. Cell Rep 2022; 41:111591. [DOI: 10.1016/j.celrep.2022.111591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 09/09/2022] [Accepted: 10/11/2022] [Indexed: 11/09/2022] Open
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40
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Haidar M, Loix M, Vanherle S, Dierckx T, Vangansewinkel T, Gervois P, Wolfs E, Lambrichts I, Bogie JFJ, Hendriks JJA. Targeting lipophagy in macrophages improves repair in multiple sclerosis. Autophagy 2022; 18:2697-2710. [PMID: 35282773 PMCID: PMC9629102 DOI: 10.1080/15548627.2022.2047343] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Foamy macrophages containing abundant intracellular myelin remnants are an important pathological hallmark of multiple sclerosis. Reducing the intracellular lipid burden in foamy macrophages is considered a promising therapeutic strategy to induce a phagocyte phenotype that promotes central nervous system repair. Recent research from our group showed that sustained intracellular accumulation of myelin-derived lipids skews these phagocytes toward a disease-promoting and more inflammatory phenotype. Our data now demonstrate that disturbed lipophagy, a selective form of autophagy that helps with the degradation of lipid droplets, contributes to the induction of this phenotype. Stimulating autophagy using the natural disaccharide trehalose reduced the lipid load and inflammatory phenotype of myelin-laden macrophages. Importantly, trehalose was able to boost remyelination in the ex vivo brain slice model and the in vivo cuprizone-induced demyelination model. In summary, our results provide a molecular rationale for impaired metabolism of myelin-derived lipids in macrophages, and identify lipophagy induction as a promising treatment strategy to promote remyelination.Abbreviations: Baf: bafilomycin a1; BMDM: bone marrow-derived macrophage; CD68: CD68 antigen; CNS: central nervous system; LD: lipid droplet; LIPE/HSL: lipase, hormone sensitive; LPS: lipopolysaccharide; MAP1LC3/LC3: microtubule-associated protein 1 light chain 3; MBP: myelin basic protein; MGLL: monoglyceride lipase; MS: multiple sclerosis; NO: nitric oxide; NOS2/iNOS: nitric oxide synthase 2, inducible; ORO: oil red o; PNPLA2: patatin-like phospholipase domain containing 2; PLIN2: perilipin 2; TEM: transmission electron microscopy; TFEB: transcription factor EB; TOH: trehalose.
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Affiliation(s)
- Mansour Haidar
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Melanie Loix
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Sam Vanherle
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Tess Dierckx
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Tim Vangansewinkel
- Department of Cardio and Organs Systems, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Pascal Gervois
- Department of Cardio and Organs Systems, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Esther Wolfs
- Department of Cardio and Organs Systems, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Ivo Lambrichts
- Department of Cardio and Organs Systems, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Jeroen F J Bogie
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Jerome J A Hendriks
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
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41
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Loix M, Wouters E, Vanherle S, Dehairs J, McManaman JL, Kemps H, Swinnen JV, Haidar M, Bogie JFJ, Hendriks JJA. Perilipin-2 limits remyelination by preventing lipid droplet degradation. Cell Mol Life Sci 2022; 79:515. [PMID: 36100764 DOI: 10.1007/s00018-022-04547-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 09/01/2022] [Accepted: 09/01/2022] [Indexed: 12/09/2022]
Abstract
Foamy macrophages and microglia containing lipid droplets (LDs) are a pathological hallmark of demyelinating disorders affecting the central nervous system (CNS). We and others showed that excessive accumulation of intracellular lipids drives these phagocytes towards a more inflammatory phenotype, thereby limiting CNS repair. To date, however, the mechanisms underlying LD biogenesis and breakdown in lipid-engorged phagocytes in the CNS, as well as their impact on foamy phagocyte biology and lesion progression, remain poorly understood. Here, we provide evidence that LD-associated protein perilipin-2 (PLIN2) controls LD metabolism in myelin-containing phagocytes. We show that PLIN2 protects LDs from lipolysis-mediated degradation, thereby impairing intracellular processing of myelin-derived lipids in phagocytes. Accordingly, loss of Plin2 stimulates LD turnover in foamy phagocytes, driving them towards a less inflammatory phenotype. Importantly, Plin2-deficiency markedly improves remyelination in the ex vivo brain slice model and in the in vivo cuprizone-induced demyelination model. In summary, we identify PLIN2 as a novel therapeutic target to prevent the pathogenic accumulation of LDs in foamy phagocytes and to stimulate remyelination.
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Affiliation(s)
- Melanie Loix
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Elien Wouters
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Sam Vanherle
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Jonas Dehairs
- Department of Oncology, Laboratory of Lipid Metabolism and Cancer, LKI-Louvain Cancer Institute, KU Leuven-University of Leuven, Leuven, Belgium
| | - James L McManaman
- Department of Obstetrics and Gynaecology, School of Medicine, University of Colorado, Denver, USA
| | - Hannelore Kemps
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Johannes V Swinnen
- Department of Oncology, Laboratory of Lipid Metabolism and Cancer, LKI-Louvain Cancer Institute, KU Leuven-University of Leuven, Leuven, Belgium
| | - Mansour Haidar
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Jeroen F J Bogie
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
- University MS Center Hasselt, Pelt, Belgium
| | - Jerome J A Hendriks
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium.
- University MS Center Hasselt, Pelt, Belgium.
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42
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Yu L, Wang L, Hu G, Ren L, Qiu C, Li S, Zhou X, Chen S, Chen R. Reprogramming alternative macrophage polarization by GATM-mediated endogenous creatine synthesis: A potential target for HDM-induced asthma treatment. Front Immunol 2022; 13:937331. [PMID: 36177049 PMCID: PMC9513582 DOI: 10.3389/fimmu.2022.937331] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 08/22/2022] [Indexed: 11/13/2022] Open
Abstract
Cellular energy metabolism plays a crucial role in the regulation of macrophage polarization and in the execution of immune functions. A recent study showed that Slc6a8-mediated creatine uptake from exogenous supplementation modulates macrophage polarization, yet little is known about the role of the de novo creatine de novobiosynthesis pathway in macrophage polarization. Here, we observed that glycine amidinotransferase (GATM), the rate-limiting enzyme for creatine synthesis, was upregulated in alternative (M2) polarized macrophages, and was dependent on the transcriptional factor STAT6, whereas GATM expression was suppressed in the classical polarized (M1) macrophage. Next, we revealed that exogenous creatine supplementation enhanced IL-4-induced M2 polarization, confirming recent work. Furthermore, we revealed that genetic ablation of GATM did not affect expression of M1 marker genes (Nos2, IL1b, IL12b) or the production of nitric oxide in both peritoneal macrophages (PMs) and bone marrow-derived macrophages (BMDMs). By contrast, expression levels of M2 markers (Arg1, Mrc1, Ccl17 and Retnla) were lower following GATM deletion. Moreover, we found that deletion of GATM in resident alveolar macrophages (AMs) significantly blocked M2 polarization but with no obvious effect on the number of cells in knockout mice. Lastly, an upregulation of GATM was found in lung tissue and bronchoalveolar lavage fluid macrophages from HDM-induced asthmatic mice. Our study uncovers a previously uncharacterized role for the de novo creatine biosynthesis enzyme GATM in M2 macrophage polarization, which may be involved in the pathogenesis of related inflammatory diseases such as an T helper 2 (Th2)-associated allergic asthma.
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Affiliation(s)
- Li Yu
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Lingwei Wang
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Guang Hu
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Laibin Ren
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Chen Qiu
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Shun Li
- Department of Animal Model, Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
- *Correspondence: Rongchang Chen, ; Shanze Chen, ; Xiaohui Zhou, ; Shun Li,
| | - Xiaohui Zhou
- Department of Animal Model, Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
- *Correspondence: Rongchang Chen, ; Shanze Chen, ; Xiaohui Zhou, ; Shun Li,
| | - Shanze Chen
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
- *Correspondence: Rongchang Chen, ; Shanze Chen, ; Xiaohui Zhou, ; Shun Li,
| | - Rongchang Chen
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
- *Correspondence: Rongchang Chen, ; Shanze Chen, ; Xiaohui Zhou, ; Shun Li,
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43
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Yu L, Wang L, Hu G, Ren L, Qiu C, Li S, Zhou X, Chen S, Chen R. Reprogramming alternative macrophage polarization by GATM-mediated endogenous creatine synthesis: A potential target for HDM-induced asthma treatment. Front Immunol 2022; 13:937331. [PMID: 36177049 PMCID: PMC9513582 DOI: 10.3389/fimmu.2022.937331 10.3389/fimmu.2022.937331] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Cellular energy metabolism plays a crucial role in the regulation of macrophage polarization and in the execution of immune functions. A recent study showed that Slc6a8-mediated creatine uptake from exogenous supplementation modulates macrophage polarization, yet little is known about the role of the de novo creatine de novobiosynthesis pathway in macrophage polarization. Here, we observed that glycine amidinotransferase (GATM), the rate-limiting enzyme for creatine synthesis, was upregulated in alternative (M2) polarized macrophages, and was dependent on the transcriptional factor STAT6, whereas GATM expression was suppressed in the classical polarized (M1) macrophage. Next, we revealed that exogenous creatine supplementation enhanced IL-4-induced M2 polarization, confirming recent work. Furthermore, we revealed that genetic ablation of GATM did not affect expression of M1 marker genes (Nos2, IL1b, IL12b) or the production of nitric oxide in both peritoneal macrophages (PMs) and bone marrow-derived macrophages (BMDMs). By contrast, expression levels of M2 markers (Arg1, Mrc1, Ccl17 and Retnla) were lower following GATM deletion. Moreover, we found that deletion of GATM in resident alveolar macrophages (AMs) significantly blocked M2 polarization but with no obvious effect on the number of cells in knockout mice. Lastly, an upregulation of GATM was found in lung tissue and bronchoalveolar lavage fluid macrophages from HDM-induced asthmatic mice. Our study uncovers a previously uncharacterized role for the de novo creatine biosynthesis enzyme GATM in M2 macrophage polarization, which may be involved in the pathogenesis of related inflammatory diseases such as an T helper 2 (Th2)-associated allergic asthma.
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Affiliation(s)
- Li Yu
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Lingwei Wang
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Guang Hu
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Laibin Ren
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Chen Qiu
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Shun Li
- Department of Animal Model, Shanghai Public Health Clinical Center, Fudan University, Shanghai, China,*Correspondence: Rongchang Chen, ; Shanze Chen, ; Xiaohui Zhou, ; Shun Li,
| | - Xiaohui Zhou
- Department of Animal Model, Shanghai Public Health Clinical Center, Fudan University, Shanghai, China,*Correspondence: Rongchang Chen, ; Shanze Chen, ; Xiaohui Zhou, ; Shun Li,
| | - Shanze Chen
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China,*Correspondence: Rongchang Chen, ; Shanze Chen, ; Xiaohui Zhou, ; Shun Li,
| | - Rongchang Chen
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital (Shenzhen People’s Hospital) and School of Medicine, Southern University of Science and Technology, Shenzhen, China,*Correspondence: Rongchang Chen, ; Shanze Chen, ; Xiaohui Zhou, ; Shun Li,
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Stearoyl-CoA Desaturase inhibition reverses immune, synaptic and cognitive impairments in an Alzheimer's disease mouse model. Nat Commun 2022; 13:2061. [PMID: 35443751 PMCID: PMC9021296 DOI: 10.1038/s41467-022-29506-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 03/15/2022] [Indexed: 11/09/2022] Open
Abstract
The defining features of Alzheimer’s disease (AD) include alterations in protein aggregation, immunity, lipid metabolism, synapses, and learning and memory. Of these, lipid abnormalities are the least understood. Here, we investigate the role of Stearoyl-CoA desaturase (SCD), a crucial regulator of fatty acid desaturation, in AD pathogenesis. We show that inhibiting brain SCD activity for 1-month in the 3xTg mouse model of AD alters core AD-related transcriptomic pathways in the hippocampus, and that it concomitantly restores essential components of hippocampal function, including dendritic spines and structure, immediate-early gene expression, and learning and memory itself. Moreover, SCD inhibition dampens activation of microglia, key mediators of spine loss during AD and the main immune cells of the brain. These data reveal that brain fatty acid metabolism links AD genes to downstream immune, synaptic, and functional impairments, identifying SCD as a potential target for AD treatment. Alzheimer’s disease (AD) is characterized by lipid abnormalities which are not well understood. Here, the authors investigate the role of Stearoyl-CoA desaturase (SCD) in a mouse model of AD. They show that inhibiting SCD activity induces major brain and immune cell transcriptional changes and restores dendritic structure and learning and memory.
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45
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Dong Y, Yong VW. Oxidized phospholipids as novel mediators of neurodegeneration. Trends Neurosci 2022; 45:419-429. [PMID: 35393134 DOI: 10.1016/j.tins.2022.03.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Revised: 02/19/2022] [Accepted: 03/08/2022] [Indexed: 10/18/2022]
Abstract
Neurodegeneration drives the progression of many neurological diseases. Inflammation and oxidative stress occurring in the CNS promote lipid peroxidation, leading to the generation of oxidized phospholipids such as oxidized phosphatidylcholines (OxPCs). OxPCs have been proposed as biomarkers of oxidative stress, where their detection in lesions in multiple sclerosis (MS), frontotemporal lobe dementia, spinal cord injury, and amyotrophic lateral sclerosis (ALS) implies that oxidative insult had occurred. However, recent findings highlight OxPCs as potent neurotoxic species requiring neutralization by microglia. Here, we summarize the science of OxPCs, including lessons from non-CNS diseases. We discuss the potential of OxPCs as common drivers of injury across neurological conditions and encourage investigations of OxPCs as novel neurotoxins.
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Affiliation(s)
- Yifei Dong
- Hotchkiss Brain Institute and the Department of Clinical Neuroscience, University of Calgary, Calgary, Alberta, Canada
| | - V Wee Yong
- Hotchkiss Brain Institute and the Department of Clinical Neuroscience, University of Calgary, Calgary, Alberta, Canada.
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Pacwa A, Machowicz J, Wojtyniak A, Pietrucha-Dutczak M, Toropainen E, Koskela A, Mrukwa-Kominek E, Lewin-Kowalik J, Smedowski A. SCD1-Fatty Acid Desaturase Inhibitor MF-438 Alleviates Latent Inflammation Induced by Preservative-Free Prostaglandin Analog Eye Drops. J Inflamm Res 2022; 15:793-806. [PMID: 35173454 PMCID: PMC8840838 DOI: 10.2147/jir.s347784] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 12/17/2021] [Indexed: 12/15/2022] Open
Abstract
Introduction Prostaglandin analogs are the first line of treatment in patients with glaucoma. Recently, many preservative-free prostaglandin analogs have been marketed to increase their tolerance in chronic use. However, potentially safer formulations have been reported to induce inflammation within ocular surface and adnexa, associated with pronounced activation of tissue macrophages. Aim We aimed to evaluate the effect of a Stearoyl-CoA desaturase-1 (SCD1) inhibitor, MF-438, on the differentiation of monocytes exposed to eye drop detergents, representing saturated fatty acid derivatives. Methods A culture of human peripheral blood monocytes was exposed to eye drops containing fatty acid derivatives (eye drop detergents), pf-latanoprost (Monoprost®, hydroxystearate macrogolglycerol – MGHS40) or pf-tafluprost (Taflotan®, polysorbate 80 – PS80), as well as pf-latanoprost+MF-438, MGHS40, and PS80. For the negative control C(-), monocytes were cultured in basal medium, and for the positive controls, monocytes were stimulated with Lipopolysaccharide (LPS) and Interferon γ (IFNγ) (M1 macrophages) or Interleukin-4 (IL-4) (M2 macrophages). The concentration of desaturase in the cell homogenates was determined by ELISA. The number of cells was counted under a microscope at 20x magnification. Results The following concentrations of SCD1 (ng/mL) were measured: 7.8±0.3 – pf-latanoprost group; 1.5±0.4 – pf-tafluprost group; 6.8±0.7 – MGHS40 group; 0.4±0.002 – PS80 group; 0.9±0.02 – pf-latanoprost+MF-438 group; 5.4±1.6 – C(-) control; 0.5±0.04 – M1 control; 2.2±0.13 – M2 control. The percentages of macrophages in culture were 33.6%, 17.6%, 33%, 0%, 13.5%, 18.6%, 36.3%, and 39.3% for the pf-latanoprost, pf-tafluprost, MGHS40, PS80, pf-latanoprost+MF-438, C(-), M1, and M2 cultures, respectively. There was a strong correlation between SCD1 concentration and macrophage count in the culture (r=0.8, p<0.05). Conclusion Inhibition of SCD1 in monocytes prevents their transformation into macrophages after exposure to saturated fatty acid derivatives contained in eye drops, which may contribute to the limitation of latent inflammation within ocular adnexa and could possibly translate into better tolerability of the topical treatment. ![]()
Point your SmartPhone at the code above. If you have a QR code reader the video abstract will appear. Or use: https://youtu.be/6BHgWVB-VRU
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Affiliation(s)
- Anna Pacwa
- Department of Physiology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
- GlaucoTech Co, Katowice, Poland
| | - Joanna Machowicz
- Department of Physiology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
| | - Alicja Wojtyniak
- Department of Physiology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
| | - Marita Pietrucha-Dutczak
- Department of Physiology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
| | - Elisa Toropainen
- School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
- Department of Ophthalmology, University of Eastern Finland, Kuopio, Finland
| | - Ali Koskela
- Department of Ophthalmology, University of Eastern Finland, Kuopio, Finland
| | - Ewa Mrukwa-Kominek
- Department of Ophthalmology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
- Department of Ophthalmology, Professor K. Gibinski University Clinical Center, Medical University of Silesia, Katowice, Poland
| | - Joanna Lewin-Kowalik
- Department of Physiology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
- GlaucoTech Co, Katowice, Poland
| | - Adrian Smedowski
- Department of Physiology, Faculty of Medical Sciences in Katowice, Medical University of Silesia, Katowice, Poland
- GlaucoTech Co, Katowice, Poland
- Department of Ophthalmology, Professor K. Gibinski University Clinical Center, Medical University of Silesia, Katowice, Poland
- Correspondence: Adrian Smedowski, Department of Physiology, Medical University of Silesia, Medykow 18, Katowice, 40-752, Poland, Tel +48 530813996, Fax +48 322525087, Email
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Berghoff SA, Spieth L, Saher G. Local cholesterol metabolism orchestrates remyelination. Trends Neurosci 2022; 45:272-283. [DOI: 10.1016/j.tins.2022.01.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 01/07/2022] [Accepted: 01/21/2022] [Indexed: 12/19/2022]
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Cantuti-Castelvetri L, Gokce O, Simons M. Reparative inflammation in multiple sclerosis. Semin Immunol 2022; 59:101630. [PMID: 35750551 DOI: 10.1016/j.smim.2022.101630] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 04/09/2022] [Accepted: 06/13/2022] [Indexed: 01/15/2023]
Affiliation(s)
- Ludovico Cantuti-Castelvetri
- Institute of Neuronal Cell Biology, Technical University Munich, 80802 Munich, Germany; German Center for Neurodegenerative Diseases (DZNE), 81377 Munich, Germany
| | - Ozgun Gokce
- Institute for Stroke and Dementia Research, University Hospital of Munich, LMU Munich, Munich, Germany; Munich Cluster of Systems Neurology (SyNergy), 81377 Munich, Germany
| | - Mikael Simons
- Institute of Neuronal Cell Biology, Technical University Munich, 80802 Munich, Germany; German Center for Neurodegenerative Diseases (DZNE), 81377 Munich, Germany; Munich Cluster of Systems Neurology (SyNergy), 81377 Munich, Germany.
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Spaas J, Franssen WMA, Keytsman C, Blancquaert L, Vanmierlo T, Bogie J, Broux B, Hellings N, van Horssen J, Posa DK, Hoetker D, Baba SP, Derave W, Eijnde BO. Carnosine quenches the reactive carbonyl acrolein in the central nervous system and attenuates autoimmune neuroinflammation. J Neuroinflammation 2021; 18:255. [PMID: 34740381 PMCID: PMC8571880 DOI: 10.1186/s12974-021-02306-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 10/22/2021] [Indexed: 12/28/2022] Open
Abstract
Background Multiple sclerosis (MS) is a chronic autoimmune disease driven by sustained inflammation in the central nervous system. One of the pathological hallmarks of MS is extensive free radical production. However, the subsequent generation, potential pathological role, and detoxification of different lipid peroxidation-derived reactive carbonyl species during neuroinflammation are unclear, as are the therapeutic benefits of carbonyl quenchers. Here, we investigated the reactive carbonyl acrolein and (the therapeutic effect of) acrolein quenching by carnosine during neuroinflammation. Methods The abundance and localization of acrolein was investigated in inflammatory lesions of MS patients and experimental autoimmune encephalomyelitis (EAE) mice. In addition, we analysed carnosine levels and acrolein quenching by endogenous and exogenous carnosine in EAE. Finally, the therapeutic effect of exogenous carnosine was assessed in vivo (EAE) and in vitro (primary mouse microglia, macrophages, astrocytes). Results Acrolein was substantially increased in inflammatory lesions of MS patients and EAE mice. Levels of the dipeptide carnosine (β-alanyl-l-histidine), an endogenous carbonyl quencher particularly reactive towards acrolein, and the carnosine-acrolein adduct (carnosine-propanal) were ~ twofold lower within EAE spinal cord tissue. Oral carnosine treatment augmented spinal cord carnosine levels (up to > tenfold), increased carnosine-acrolein quenching, reduced acrolein-protein adduct formation, suppressed inflammatory activity, and alleviated clinical disease severity in EAE. In vivo and in vitro studies indicate that pro-inflammatory microglia/macrophages generate acrolein, which can be efficiently quenched by increasing carnosine availability, resulting in suppressed inflammatory activity. Other properties of carnosine (antioxidant, nitric oxide scavenging) may also contribute to the therapeutic effects. Conclusions Our results identify carbonyl (particularly acrolein) quenching by carnosine as a therapeutic strategy to counter inflammation and macromolecular damage in MS. Supplementary Information The online version contains supplementary material available at 10.1186/s12974-021-02306-9.
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Affiliation(s)
- Jan Spaas
- University MS Center (UMSC) Hasselt - Pelt, Hasselt, Belgium. .,BIOMED Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Hasselt, Belgium. .,Department of Movement and Sports Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium.
| | - Wouter M A Franssen
- BIOMED Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Hasselt, Belgium.,REVAL Rehabilitation Research Center, Faculty of Rehabilitation Sciences, Hasselt University, Hasselt, Belgium
| | - Charly Keytsman
- University MS Center (UMSC) Hasselt - Pelt, Hasselt, Belgium.,BIOMED Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Hasselt, Belgium.,REVAL Rehabilitation Research Center, Faculty of Rehabilitation Sciences, Hasselt University, Hasselt, Belgium
| | - Laura Blancquaert
- Department of Movement and Sports Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Tim Vanmierlo
- University MS Center (UMSC) Hasselt - Pelt, Hasselt, Belgium.,Neuro-Immune Connections and Repair Lab, Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium.,Division of Translational Neuroscience, Department Psychiatry and Neuropsychology, European Graduate School of Neuroscience, School for Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands
| | - Jeroen Bogie
- University MS Center (UMSC) Hasselt - Pelt, Hasselt, Belgium.,BIOMED Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Hasselt, Belgium
| | - Bieke Broux
- University MS Center (UMSC) Hasselt - Pelt, Hasselt, Belgium.,Neuro-Immune Connections and Repair Lab, Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium.,Department of Internal Medicine, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
| | - Niels Hellings
- University MS Center (UMSC) Hasselt - Pelt, Hasselt, Belgium.,Neuro-Immune Connections and Repair Lab, Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Jack van Horssen
- University MS Center (UMSC) Hasselt - Pelt, Hasselt, Belgium.,BIOMED Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Hasselt, Belgium.,Department of Molecular Cell Biology and Immunology, Amsterdam Neuroscience, MS Center Amsterdam, Amsterdam University Medical Center, Location VUmc, Amsterdam, The Netherlands
| | - Dheeraj Kumar Posa
- Diabetes and Obesity Center, University of Louisville, Louisville, KY, USA
| | - David Hoetker
- Diabetes and Obesity Center, University of Louisville, Louisville, KY, USA
| | - Shahid P Baba
- Diabetes and Obesity Center, University of Louisville, Louisville, KY, USA
| | - Wim Derave
- Department of Movement and Sports Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Bert O Eijnde
- University MS Center (UMSC) Hasselt - Pelt, Hasselt, Belgium.,BIOMED Biomedical Research Institute, Faculty of Medicine and Life Sciences, Hasselt University, Hasselt, Belgium
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Haidar M, Loix M, Bogie JFJ, Hendriks JJA. Lipophagy: a new player in CNS disorders. Trends Endocrinol Metab 2021; 32:941-951. [PMID: 34561114 DOI: 10.1016/j.tem.2021.08.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 08/23/2021] [Accepted: 08/30/2021] [Indexed: 01/18/2023]
Abstract
Lipophagy is the process of selective degradation of lipid droplets (LDs) by autophagy. Several studies have highlighted the importance of lipophagy in regulating cellular lipid levels in various tissues and disease conditions. In recent years, disruption of autophagy and accumulation of LDs have been reported as pathological hallmarks in several neurodegenerative and neuroinflammatory diseases, raising the question whether lipophagy is a process that is important in the progression of these disorders. This supports the growing interest in lipid metabolism as a major player in neurodegeneration, and the emerging understanding of several neurological pathologies as not only proteinopathies but also lipidopathies. In this review we discuss the importance of lipophagy in the most common central nervous system diseases. We examine the latest evidence for the reported interplay between abnormalities in lipid accumulation and autophagy, and propose lipophagy as a potentially important mechanism in neurodegeneration.
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Affiliation(s)
- Mansour Haidar
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Melanie Loix
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Jeroen F J Bogie
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Jerome J A Hendriks
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium.
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