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Mathavarajah S, Dellaire G. LINE-1: an emerging initiator of cGAS-STING signalling and inflammation that is dysregulated in disease. Biochem Cell Biol 2024; 102:38-46. [PMID: 37643478 DOI: 10.1139/bcb-2023-0134] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023] Open
Abstract
The cGAS-STING (cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING)) axis integrates DNA damage and cellular stress with type I interferon (IFN) signalling to facilitate transcriptional changes underlying inflammatory stress responses. The cGAS-STING pathway responds to cytosolic DNA in the form of double-stranded DNA, micronuclei, and long interspersed nuclear element 1 (L1) retroelements. L1 retroelements are a class of self-propagating non-long terminal repeat transposons that have remained highly active in mammalian genomes. L1 retroelements are emerging as important inducers of cGAS-STING and IFN signalling, which are often dysregulated in several diseases, including cancer. A key repressor of cGAS-STING and L1 activity is the exonuclease three prime repair exonuclease 1 (TREX1), and loss of TREX1 promotes the accumulation of L1. In addition, L1 dysregulation is a common theme among diseases with chronic induction of type I IFN signalling through cGAS-STING, such as Aicardi-Goutières syndrome, Fanconi anemia, and dermatomyositis. Although TREX1 is highly conserved in tetrapod species, other suppressor proteins exist that inhibit L1 retrotransposition. These suppressor genes when mutated are often associated with diseases characterized by unchecked inflammation that is associated with high cGAS-STING activity and elevated levels of L1 expression. In this review, we discuss these interconnected pathways of L1 suppression and their role in the regulation of cGAS-STING and inflammation in disease.
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Affiliation(s)
| | - Graham Dellaire
- Department of Pathology, Faculty of Medicine, Dalhousie University, Halifax, NS, Canada
- Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS, Canada
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Marmen MB, Orfi Z, Dort J, Proulx-Gauthier JP, Chrestian N, Dumont NA, Ellezam B. Decreased dystrophin expression and elevated dystrophin-targeting miRNAs in anti-HMGCR immune-mediated necrotizing myopathy. Acta Neuropathol 2023; 146:655-658. [PMID: 37543531 DOI: 10.1007/s00401-023-02619-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Revised: 08/02/2023] [Accepted: 08/02/2023] [Indexed: 08/07/2023]
Affiliation(s)
- Maude B Marmen
- Division of Rheumatology, CHU de Québec-Université Laval, Québec, Québec, Canada
| | - Zakaria Orfi
- CHU Sainte-Justine Research Centre, Montréal, Québec, Canada
- Department of Pharmacology and Physiology, Université de Montréal, Montréal, Québec, Canada
| | - Junio Dort
- CHU Sainte-Justine Research Centre, Montréal, Québec, Canada
- Department of Pharmacology and Physiology, Université de Montréal, Montréal, Québec, Canada
| | | | - Nicolas Chrestian
- Division of Pediatric Neurology, CHU de Québec-Université Laval, Québec, Québec, Canada
| | - Nicolas A Dumont
- CHU Sainte-Justine Research Centre, Montréal, Québec, Canada
- School of Rehabilitation, Université de Montréal, Montréal, Québec, Canada
| | - Benjamin Ellezam
- Division of Pathology, Department of Pathology and Cell Biology, CHU Sainte-Justine, Université de Montréal, 3175 Chemin de La Côte-Sainte-Catherine, Montréal, Québec, H3T 1C5, Canada.
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Awuah WA, Huang H, Kalmanovich J, Mehta A, Mikhailova T, Ng JC, Abdul-Rahman T, Adebusoye FT, Tan JK, Kamanousa K, Ferreira T, Roy S, Kundu M, Yarlagadda R, Mukerjee N, Alexiou A, Papadakis M. Circadian rhythm in systemic autoimmune conditions: Potential of chrono-immunology in clinical practice: A narrative review. Medicine (Baltimore) 2023; 102:e34614. [PMID: 37565922 PMCID: PMC10419593 DOI: 10.1097/md.0000000000034614] [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: 06/06/2023] [Accepted: 07/14/2023] [Indexed: 08/12/2023] Open
Abstract
The circadian rhythm (CR) is a fundamental biological process regulated by the Earth's rotation and solar cycles. It plays a critical role in various bodily functions, and its dysregulation can have systemic effects. These effects impact metabolism, redox homeostasis, cell cycle regulation, gut microbiota, cognition, and immune response. Immune mediators, cycle proteins, and hormones exhibit circadian oscillations, supporting optimal immune function and defence against pathogens. Sleep deprivation and disruptions challenge the regulatory mechanisms, making immune responses vulnerable. Altered CR pathways have been implicated in diseases such as diabetes, neurological conditions, and systemic autoimmune diseases (SADs). SADs involve abnormal immune responses to self-antigens, with genetic and environmental factors disrupting self-tolerance and contributing to conditions like Systemic Lupus Erythematosus, Rheumatoid Arthritis, and Inflammatory Myositis. Dysregulated CR may lead to increased production of pro-inflammatory cytokines, contributing to the systemic responses observed in SADs. Sleep disturbances significantly impact the quality of life of patients with SADs; however, they are often overlooked. The relationship between sleep and autoimmune conditions, whether causal or consequential to CR dysregulation, remains unclear. Chrono-immunology investigates the role of CR in immunity, offering potential for targeted therapies in autoimmune conditions. This paper provides an overview of the connections between sleep and autoimmune conditions, highlighting the importance of recognizing sleep disturbances in SADs and the need for further research into the complex relationship between the CR and autoimmune diseases.
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Affiliation(s)
| | - Helen Huang
- Royal College of Surgeons in Ireland, University of Medicine and Health Sciences, Dublin, Ireland
| | | | - Aashna Mehta
- University of Debrecen-Faculty of Medicine, Debrecen, Hungary
| | | | - Jyi Cheng Ng
- Faculty of Medicine and Health Sciences, University of Putra Malaysia, Serdang, Malaysia
| | | | | | | | | | - Tomas Ferreira
- School of Clinical Medicine, University of Cambridge, Cambridge, UK
| | - Sakshi Roy
- School of Medicine, Queen’s University Belfast, Belfast, UK
| | - Mrinmoy Kundu
- Institute of Medical Sciences and SUM Hospital, Bhubaneswar, India
| | | | - Nobendu Mukerjee
- Department of Microbiology, West Bengal State University, Barasat, India
- Department of Health Sciences, Novel Global Community Educational Foundation, Hebersham, NSW
| | - Athanasios Alexiou
- Department of Science and Engineering, Novel Global Community Educational Foundation, Hebersham, NSW
| | - Marios Papadakis
- Department of Surgery II, University Hospital Witten-Herdecke, Heusnerstrasse 40, University of Witten-Herdecke, Wuppertal, Germany
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Huang C, Li W, Ren X, Tang M, Zhang K, Zhuo F, Dou X, Yu B. The Crucial Roles and Research Advances of cGAS-STING Pathway in Cutaneous Disorders. Inflammation 2023:10.1007/s10753-023-01812-7. [PMID: 37083899 PMCID: PMC10119538 DOI: 10.1007/s10753-023-01812-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 03/14/2023] [Accepted: 03/29/2023] [Indexed: 04/22/2023]
Abstract
The cGAS-STING signaling pathway senses the presence of cytosolic DNA, induces strong type I interferon responses, and enhances inflammatory cytokine production, placing it as an important axis in infection, autoimmunity, and tumor immunity. Recent studies have shown that the abnormalities and/or dysfunctions of cGAS-STING signaling are closely related to the pathogenesis of skin diseases and/or cancers. Additionally, a variety of new therapeutics targeting the cGAS-STING signaling are in development for the treatment of skin disorders. However, the precise molecular mechanisms of cGAS-STING-mediated cutaneous disorders have not been fully elucidated. In this review, we will summarize the regulatory roles and mechanisms of cGAS-STING signaling in skin disorders and recent progresses of cGAS-STING-related drugs as well as their potential clinical applications.
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Affiliation(s)
- Cong Huang
- Department of Dermatology, Skin Research Institute of Peking University Shenzhen Hospital, Peking University Shenzhen Hospital, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, 518036, China
| | - Wenting Li
- Department of Dermatology, Skin Research Institute of Peking University Shenzhen Hospital, Peking University Shenzhen Hospital, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, 518036, China
| | - Xuanyao Ren
- Biomedical Research Institute, Shenzhen Peking University - the Hong Kong University of Science and Technology Medical Center, Shenzhen, 518036, China
| | - Mindan Tang
- Biomedical Research Institute, Shenzhen Peking University - the Hong Kong University of Science and Technology Medical Center, Shenzhen, 518036, China
| | - Kaoyuan Zhang
- Biomedical Research Institute, Shenzhen Peking University - the Hong Kong University of Science and Technology Medical Center, Shenzhen, 518036, China
| | - Fan Zhuo
- Department of Dermatology, Skin Research Institute of Peking University Shenzhen Hospital, Peking University Shenzhen Hospital, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, 518036, China
| | - Xia Dou
- Department of Dermatology, Skin Research Institute of Peking University Shenzhen Hospital, Peking University Shenzhen Hospital, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, 518036, China
| | - Bo Yu
- Department of Dermatology, Skin Research Institute of Peking University Shenzhen Hospital, Peking University Shenzhen Hospital, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, 518036, China.
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