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Falkowski L, Buddenkotte J, Datsi A. Epigenetics in T-cell driven inflammation and cancer. Semin Cell Dev Biol 2024; 154:250-260. [PMID: 36641367 DOI: 10.1016/j.semcdb.2023.01.008] [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: 09/18/2022] [Revised: 01/06/2023] [Accepted: 01/08/2023] [Indexed: 01/15/2023]
Abstract
For decades, scientists have been investigating how processes such as gene expression, stem cell plasticity, and cell differentiation can be modulated. The discovery of epigenetics helped unravel these processes and enabled the identification of major underlying mechanisms that, for example, are central for T cell maturation. T cells go through various stages in their development evolving from progenitor cells into double positive CD4/CD8 T cells that finally leave the thymus as naïve T cells. One major mechanism driving T cell maturation is the modulation of gene activity by temporally sequenced transcription of spatially exposed gene loci. DNA methylation, demethylation, and acetylation are key processes that enable a sequenced gene expression required for T cell differentiation. In vivo, differentiated T cells are subjected to enormous pressures originating from the microenvironment. Signals from this environment, particularly from an inflammatory or a tumor microenvironment, can push T cells to differentiate into specific effector and memory T cells, and even prompt T cells to adopt a state of dysfunctional exhaustion, en route of an epigenetically controlled mechanism. Fundamentals of these processes will be discussed in this review highlighting potential therapeutic interventions, in particular those beneficial to revive exhausted T cells.
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Affiliation(s)
- Lea Falkowski
- Institute for Transplantational Diagnostics and Cell Therapeutics, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Joerg Buddenkotte
- Department of Dermatology and Venereology, Hamad Medical Corporation, Doha, Qatar; Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha, Qatar.
| | - Angeliki Datsi
- Institute for Transplantational Diagnostics and Cell Therapeutics, University Hospital Düsseldorf, Düsseldorf, Germany
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Xu X, Liu R, Li Y, Zhang C, Guo C, Zhu J, Dong J, Ouyang L, Momeni MR. Spinal Cord Injury: From MicroRNAs to Exosomal MicroRNAs. Mol Neurobiol 2024:10.1007/s12035-024-03954-7. [PMID: 38261255 DOI: 10.1007/s12035-024-03954-7] [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: 11/05/2023] [Accepted: 01/12/2024] [Indexed: 01/24/2024]
Abstract
Spinal cord injury (SCI) is an unfortunate experience that may generate extensive sensory and motor disabilities due to the destruction and passing of nerve cells. MicroRNAs are small RNA molecules that do not code for proteins but instead serve to regulate protein synthesis by targeting messenger RNA's expression. After SCI, secondary damage like apoptosis, oxidative stress, inflammation, and autophagy occurs, and differentially expressed microRNAs show a function in these procedures. Almost all animal and plant cells release exosomes, which are sophisticated formations of lipid membranes. These exosomes have the capacity to deliver significant materials, such as proteins, RNAs and lipids, to cells in need, regulating their functions and serving as a way of communication. This new method offers a fresh approach to treating spinal cord injury. Obviously, the exosome has the benefit of conveying the transported material across performing regulatory activities and the blood-brain barrier. Among the exosome cargoes, microRNAs, which modulate their mRNA targets, show considerable promise in the pathogenic diagnosis, process, and therapy of SCI. Herein, we describe the roles of microRNAs in SCI. Furthermore, we emphasize the importance of exosomal microRNAs in this disease.
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Affiliation(s)
- Xiangyang Xu
- Spinal Surgery, Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Traditional Chinese Medicine), Zhengzhou, Henan, 450003, China
| | - Ruyin Liu
- Spinal Surgery, Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Traditional Chinese Medicine), Zhengzhou, Henan, 450003, China
| | - Yunpeng Li
- Spinal Surgery, Henan Province Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Henan University of Traditional Chinese Medicine), Zhengzhou, Henan, 450003, China
| | - Cheng Zhang
- College of Traditional Chinese Medicine Orthopedics and Traumatology, Henan University of Traditional Chinese Medicine, Zhengzhou, Henan, 450003, China
| | - Chuanghao Guo
- College of Traditional Chinese Medicine Orthopedics and Traumatology, Henan University of Traditional Chinese Medicine, Zhengzhou, Henan, 450003, China
| | - Jiong Zhu
- College of Traditional Chinese Medicine Orthopedics and Traumatology, Henan University of Traditional Chinese Medicine, Zhengzhou, Henan, 450003, China
| | - Jiaan Dong
- College of Traditional Chinese Medicine Orthopedics and Traumatology, Henan University of Traditional Chinese Medicine, Zhengzhou, Henan, 450003, China
| | - Liyun Ouyang
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang, 11700, Malaysia.
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Ma Y, Wang W, Liu S, Qiao X, Xing Y, Zhou Q, Zhang Z. Epigenetic Regulation of Neuroinflammation in Alzheimer's Disease. Cells 2023; 13:79. [PMID: 38201283 PMCID: PMC10778497 DOI: 10.3390/cells13010079] [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: 11/28/2023] [Revised: 12/25/2023] [Accepted: 12/28/2023] [Indexed: 01/12/2024] Open
Abstract
Alzheimer's disease (AD) is a chronic and progressive neurodegenerative disease and clinically manifests with cognitive decline and behavioral disabilities. Over the past years, mounting studies have demonstrated that the inflammatory response plays a key role in the onset and development of AD, and neuroinflammation has been proposed as the third major pathological driving factor of AD, ranking after the two well-known core pathologies, amyloid β (Aβ) deposits and neurofibrillary tangles (NFTs). Epigenetic mechanisms, referring to heritable changes in gene expression independent of DNA sequence alterations, are crucial regulators of neuroinflammation which have emerged as potential therapeutic targets for AD. Upon regulation of transcriptional repression or activation, epigenetic modification profiles are closely involved in inflammatory gene expression and signaling pathways of neuronal differentiation and cognitive function in central nervous system disorders. In this review, we summarize the current knowledge about epigenetic control mechanisms with a focus on DNA and histone modifications involved in the regulation of inflammatory genes and signaling pathways in AD, and the inhibitors under clinical assessment are also discussed.
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Affiliation(s)
- Yajing Ma
- College of Biology and Food, Shangqiu Normal University, Shangqiu 476000, China;
| | - Wang Wang
- Department of Physiology and Neurobiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (W.W.); (Y.X.)
| | - Sufang Liu
- Department of Biomedical Sciences, College of Dentistry, Texas A&M University, Dallas, TX 75246, USA;
| | - Xiaomeng Qiao
- Department of Pathology and Forensic Medicine, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China;
| | - Ying Xing
- Department of Physiology and Neurobiology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China; (W.W.); (Y.X.)
| | - Qingfeng Zhou
- College of Biology and Food, Shangqiu Normal University, Shangqiu 476000, China;
| | - Zhijian Zhang
- College of Biology and Food, Shangqiu Normal University, Shangqiu 476000, China;
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Walther J, Kirsch EM, Hellwig L, Schmerbeck SS, Holloway PM, Buchan AM, Mergenthaler P. Reinventing the Penumbra - the Emerging Clockwork of a Multi-modal Mechanistic Paradigm. Transl Stroke Res 2023; 14:643-666. [PMID: 36219377 PMCID: PMC10444697 DOI: 10.1007/s12975-022-01090-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 09/16/2022] [Accepted: 09/21/2022] [Indexed: 11/25/2022]
Abstract
The concept of the ischemic penumbra was originally defined as the area around a necrotic stroke core and seen as the tissue at imminent risk of further damage. Today, the penumbra is generally considered as time-sensitive hypoperfused brain tissue with decreased oxygen and glucose availability, salvageable tissue as treated by intervention, and the potential target for neuroprotection in focal stroke. The original concept entailed electrical failure and potassium release but one short of neuronal cell death and was based on experimental stroke models, later confirmed in clinical imaging studies. However, even though the basic mechanisms have translated well, conferring brain protection, and improving neurological outcome after stroke based on the pathophysiological mechanisms in the penumbra has yet to be achieved. Recent findings shape the modern understanding of the penumbra revealing a plethora of molecular and cellular pathophysiological mechanisms. We now propose a new model of the penumbra, one which we hope will lay the foundation for future translational success. We focus on the availability of glucose, the brain's central source of energy, and bioenergetic failure as core pathophysiological concepts. We discuss the relation of mitochondrial function in different cell types to bioenergetics and apoptotic cell death mechanisms, autophagy, and neuroinflammation, to glucose metabolism in what is a dynamic ischemic penumbra.
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Affiliation(s)
- Jakob Walther
- Charité - Universitätsmedizin Berlin, Department of Neurology with Experimental Neurology, Charitéplatz 1, 10117, Berlin, Germany
- Charité - Universitätsmedizin Berlin, Center for Stroke Research Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Elena Marie Kirsch
- Charité - Universitätsmedizin Berlin, Department of Neurology with Experimental Neurology, Charitéplatz 1, 10117, Berlin, Germany
- Charité - Universitätsmedizin Berlin, Center for Stroke Research Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Lina Hellwig
- Charité - Universitätsmedizin Berlin, Department of Neurology with Experimental Neurology, Charitéplatz 1, 10117, Berlin, Germany
- Charité - Universitätsmedizin Berlin, Center for Stroke Research Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Sarah S Schmerbeck
- Charité - Universitätsmedizin Berlin, Department of Neurology with Experimental Neurology, Charitéplatz 1, 10117, Berlin, Germany
- Charité - Universitätsmedizin Berlin, Center for Stroke Research Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Paul M Holloway
- Acute Stroke Programme, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 9DU, UK
| | - Alastair M Buchan
- Charité - Universitätsmedizin Berlin, Center for Stroke Research Berlin, Charitéplatz 1, 10117, Berlin, Germany.
- Acute Stroke Programme, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 9DU, UK.
| | - Philipp Mergenthaler
- Charité - Universitätsmedizin Berlin, Department of Neurology with Experimental Neurology, Charitéplatz 1, 10117, Berlin, Germany.
- Charité - Universitätsmedizin Berlin, Center for Stroke Research Berlin, Charitéplatz 1, 10117, Berlin, Germany.
- Charité - Universitätsmedizin Berlin, NeuroCure Clinical Research Center, Charitéplatz 1, 10117, Berlin, Germany.
- Acute Stroke Programme, Radcliffe Department of Medicine, University of Oxford, Oxford, OX3 9DU, UK.
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Van Roy Z, Shi W, Kak G, Duan B, Kielian T. Epigenetic Regulation of Leukocyte Inflammatory Mediator Production Dictates Staphylococcus aureus Craniotomy Infection Outcome. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2023; 211:414-428. [PMID: 37314520 PMCID: PMC10524781 DOI: 10.4049/jimmunol.2300050] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Accepted: 05/18/2023] [Indexed: 06/15/2023]
Abstract
Staphylococcus aureus is a common cause of surgical-site infections, including those arising after craniotomy, which is performed to access the brain for the treatment of tumors, epilepsy, or hemorrhage. Craniotomy infection is characterized by complex spatial and temporal dynamics of leukocyte recruitment and microglial activation. We recently identified unique transcriptional profiles of these immune populations during S. aureus craniotomy infection. Epigenetic processes allow rapid and reversible control over gene transcription; however, little is known about how epigenetic pathways influence immunity to live S. aureus. An epigenetic compound library screen identified bromodomain and extraterminal domain-containing (BET) proteins and histone deacetylases (HDACs) as critical for regulating TNF, IL-6, IL-10, and CCL2 production by primary mouse microglia, macrophages, neutrophils, and granulocytic myeloid-derived suppressor cells in response to live S. aureus. Class I HDACs (c1HDACs) were increased in these cell types in vitro and in vivo during acute disease in a mouse model of S. aureus craniotomy infection. However, substantial reductions in c1HDACs were observed during chronic infection, highlighting temporal regulation and the importance of the tissue microenvironment for dictating c1HDAC expression. Microparticle delivery of HDAC and BET inhibitors in vivo caused widespread decreases in inflammatory mediator production, which significantly increased bacterial burden in the brain, galea, and bone flap. These findings identify histone acetylation as an important mechanism for regulating cytokine and chemokine production across diverse immune cell lineages that is critical for bacterial containment. Accordingly, aberrant epigenetic regulation may be important for promoting S. aureus persistence during craniotomy infection.
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Affiliation(s)
- Zachary Van Roy
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE 68198
| | - Wen Shi
- Mary & Dick Holland Regenerative Medicine Program; Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198
| | - Gunjan Kak
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE 68198
| | - Bin Duan
- Mary & Dick Holland Regenerative Medicine Program; Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE 68198
| | - Tammy Kielian
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE 68198
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Lukens JR, Williams JL. An introduction to neuroimmunology. Immunol Rev 2022; 311:5-8. [PMID: 36039857 PMCID: PMC9489657 DOI: 10.1111/imr.13133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- John R. Lukens
- Center for Brain Immunology and Glia (BIG), Department of Neuroscience, University of Virginia, Charlottesville, VA, USA
| | - Jessica L. Williams
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Brain Health Research Institute, Kent State University, Kent, Ohio, USA
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