1
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Gu B, Le GH, Herrera S, Blair SJ, Meissner TB, Strominger JL. HLA-C expression in extravillous trophoblasts is determined by an ELF3-NLRP2/NLRP7 regulatory axis. Proc Natl Acad Sci U S A 2024; 121:e2404229121. [PMID: 39052836 PMCID: PMC11295039 DOI: 10.1073/pnas.2404229121] [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: 03/01/2024] [Accepted: 06/03/2024] [Indexed: 07/27/2024] Open
Abstract
The distinct human leukocyte antigen (HLA) class I expression pattern of human extravillous trophoblasts (EVT) endows them with unique tolerogenic properties that enable successful pregnancy. Nevertheless, how this process is elaborately regulated remains elusive. Previously, E74 like ETS transcription factor 3 (ELF3) was identified to govern high-level HLA-C expression in EVT. In the present study, ELF3 is found to bind to the enhancer region of two adjacent NOD-like receptor (NLR) genes, NLR family pyrin domain-containing 2 and 7 (NLRP2, NLRP7). Notably, our analysis of ELF3-deficient JEG-3 cells, a human choriocarcinoma cell line widely used to study EVT biology, suggests that ELF3 transactivates NLRP7 while suppressing the expression of NLRP2. Moreover, we find that NLRP2 and NLRP7 have opposing effects on HLA-C expression, thus implicating them in immune evasion at the maternal-fetal interface. We confirmed that NLRP2 suppresses HLA-C levels and described a unique role for NLRP7 in promoting HLA-C expression in JEG-3. These results suggest that these two NLR genes, which arose via gene duplication in primates, are fine-tuned by ELF3 yet have acquired divergent functions to enable proper expression levels of HLA-C in EVT, presumably through modulating the degradation kinetics of IkBα. Targeting the ELF3-NLRP2/NLRP7-HLA-C axis may hold therapeutic potential for managing pregnancy-related disorders, such as recurrent hydatidiform moles and fetal growth restriction, and thus improve placental development and pregnancy outcomes.
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Affiliation(s)
- Bowen Gu
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA02138
| | - Gia-Han Le
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA02138
| | - Sebastian Herrera
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA02138
| | - Steven J. Blair
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA02138
| | - Torsten B. Meissner
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA02138
- Department of Surgery, Beth Israel Deaconess Medical Center, Boston, MA02115
- Department of Surgery, Harvard Medical School, Boston, MA02115
| | - Jack L. Strominger
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA02138
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2
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Tovar Perez JE, Zhang S, Hodgeman W, Kapoor S, Rajendran P, Kobayashi KS, Dashwood RH. Epigenetic regulation of major histocompatibility complexes in gastrointestinal malignancies and the potential for clinical interception. Clin Epigenetics 2024; 16:83. [PMID: 38915093 PMCID: PMC11197381 DOI: 10.1186/s13148-024-01698-8] [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: 11/10/2023] [Accepted: 06/18/2024] [Indexed: 06/26/2024] Open
Abstract
BACKGROUND Gastrointestinal malignancies encompass a diverse group of cancers that pose significant challenges to global health. The major histocompatibility complex (MHC) plays a pivotal role in immune surveillance, orchestrating the recognition and elimination of tumor cells by the immune system. However, the intricate regulation of MHC gene expression is susceptible to dynamic epigenetic modification, which can influence functionality and pathological outcomes. MAIN BODY By understanding the epigenetic alterations that drive MHC downregulation, insights are gained into the molecular mechanisms underlying immune escape, tumor progression, and immunotherapy resistance. This systematic review examines the current literature on epigenetic mechanisms that contribute to MHC deregulation in esophageal, gastric, pancreatic, hepatic and colorectal malignancies. Potential clinical implications are discussed of targeting aberrant epigenetic modifications to restore MHC expression and 0 the effectiveness of immunotherapeutic interventions. CONCLUSION The integration of epigenetic-targeted therapies with immunotherapies holds great potential for improving clinical outcomes in patients with gastrointestinal malignancies and represents a compelling avenue for future research and therapeutic development.
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Affiliation(s)
| | - Shilan Zhang
- Department of Cardiovascular Medicine, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, 200070, China
| | - William Hodgeman
- Wolfson Medical School, The University of Glasgow, Glasgow, G12 8QQ, UK
| | - Sabeeta Kapoor
- Center for Epigenetics and Disease Prevention, Texas A&M Health, Houston, TX, 77030, USA
| | - Praveen Rajendran
- Center for Epigenetics and Disease Prevention, Texas A&M Health, Houston, TX, 77030, USA
- Department of Translational Medical Sciences, and Antibody & Biopharmaceuticals Core, Texas A&M Medicine, Houston, TX, 77030, USA
| | - Koichi S Kobayashi
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, 060-8638, Japan
- Hokkaido University Institute for Vaccine Research and Development, Sapporo, 060-8638, Japan
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health, Bryan, TX, 77087, USA
| | - Roderick H Dashwood
- Center for Epigenetics and Disease Prevention, Texas A&M Health, Houston, TX, 77030, USA.
- Department of Translational Medical Sciences, and Antibody & Biopharmaceuticals Core, Texas A&M Medicine, Houston, TX, 77030, USA.
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3
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Zhu B, Ouda R, An N, Tanaka T, Kobayashi KS. The balance between nuclear import and export of NLRC5 regulates MHC class I transactivation. J Biol Chem 2024; 300:107205. [PMID: 38519032 PMCID: PMC11044055 DOI: 10.1016/j.jbc.2024.107205] [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: 05/29/2023] [Revised: 02/08/2024] [Accepted: 03/06/2024] [Indexed: 03/24/2024] Open
Abstract
Major histocompatibility complex (MHC) class I molecules play an essential role in regulating the adaptive immune system by presenting antigens to CD8 T cells. CITA (MHC class I transactivator), also known as NLRC5 (NLR family, CARD domain-containing 5), regulates the expression of MHC class I and essential components involved in the MHC class I antigen presentation pathway. While the critical role of the nuclear distribution of NLRC5 in its transactivation activity has been known, the regulatory mechanism to determine the nuclear localization of NLRC5 remains poorly understood. In this study, a comprehensive analysis of all domains in NLRC5 revealed that the regulatory mechanisms for nuclear import and export of NLRC5 coexist and counterbalance each other. Moreover, GCN5 (general control non-repressed 5 protein), a member of HATs (histone acetyltransferases), was found to be a key player to retain NLRC5 in the nucleus, thereby contributing to the expression of MHC class I. Therefore, the balance between import and export of NLRC5 has emerged as an additional regulatory mechanism for MHC class I transactivation, which would be a potential therapeutic target for the treatment of cancer and virus-infected diseases.
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Affiliation(s)
- Baohui Zhu
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Ryota Ouda
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Ning An
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Tsutomu Tanaka
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan; Institute for Vaccine Research and Development (HU-IVReD), Hokkaido University, Sapporo, Japan
| | - Koichi S Kobayashi
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan; Institute for Vaccine Research and Development (HU-IVReD), Hokkaido University, Sapporo, Japan; Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, Texas, USA.
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4
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Zhu B, Ouda R, de Figueiredo P, Kobayashi KS. ORF6, a repressor of the MHC class I pathway: new molecular target for SARS-CoV-2 drug discovery? Expert Opin Ther Targets 2023; 27:639-644. [PMID: 37602463 DOI: 10.1080/14728222.2023.2248377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 07/19/2023] [Accepted: 08/10/2023] [Indexed: 08/22/2023]
Affiliation(s)
- Baohui Zhu
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Ryota Ouda
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Paul de Figueiredo
- Christopher S. Bond Life Sciences Center, Department of Molecular Microbiology and Immunology, and Department of Veterinary Pathobiology, University of Missouri, Columbia, MO, USA
| | - Koichi S Kobayashi
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
- Hokkaido University, Institute for Vaccine Research and Development (HU-IVReD), Sapporo, Japan
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, Bryan, TX, USA
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5
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Qi Z, Xu Y, Liu Y, Zhang Q, Wang Z, Mei J, Wang D. Transcriptome analysis of largemouth bass (Micropterus salmoides) challenged with LPS and polyI:C. FISH & SHELLFISH IMMUNOLOGY 2023; 133:108534. [PMID: 36649809 DOI: 10.1016/j.fsi.2023.108534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 01/07/2023] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
Largemouth bass (Micropterus salmoides) is a worldwide commercially important aquatic species. In recent years, pathogenic diseases cause great economic losses and hinder the industry of largemouth bass. To further understand the immune response against pathogens in largemouth bass, splenic transcriptome libraries of largemouth bass were respectively constructed at 12 h post-challenged with phosphate-buffered saline (PBS), lipopolysaccharide (LPS) and polyinosinic-polycytidylic acid (polyI:C) by using RNA sequencing technology (RNA-seq). RNA libraries were constructed using 9 RNA splenic samples isolated from three biological replicates of the three groups and sequenced on the DNBSEQ platform. A total number of 86,306 unigenes were obtained. Through pairwise comparisons among the three groups, we identified 11,295 different expression genes (DEGs) exhibiting significant differences at the transcript level. There were 7, 7, and 13 signal pathways were significantly enriched in LPS-PBS comparison, polyI:C-PBS comparison, and LPS-polyI:C comparison, respectively, indicating that the immune response to different pathogens was distinct in largemouth bass. To the best of our knowledge, this is the first report on the immune response of largemouth bass against different pathogen-associated molecular patterns (PAMPs) stimuli using transcriptomic analysis. Our results provide a valuable resource and new insights to understanding the immune characteristics of largemouth bass against different pathogens.
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Affiliation(s)
- Zhitao Qi
- Jiangsu Key Laboratory of Biochemistry and Biotechnology of Marine Wetland, Yancheng Institute of Technology, Yancheng, Jiangsu Province, 224051, China.
| | - Yang Xu
- Jiangsu Key Laboratory of Biochemistry and Biotechnology of Marine Wetland, Yancheng Institute of Technology, Yancheng, Jiangsu Province, 224051, China; College of Animal Science and Technology, Hunan Agricultural University, Changsha, Hunan Province, China
| | - Yuhao Liu
- Jiangsu Key Laboratory of Biochemistry and Biotechnology of Marine Wetland, Yancheng Institute of Technology, Yancheng, Jiangsu Province, 224051, China
| | - Qihuan Zhang
- Jiangsu Key Laboratory of Biochemistry and Biotechnology of Marine Wetland, Yancheng Institute of Technology, Yancheng, Jiangsu Province, 224051, China
| | - Zisheng Wang
- Jiangsu Key Laboratory of Biochemistry and Biotechnology of Marine Wetland, Yancheng Institute of Technology, Yancheng, Jiangsu Province, 224051, China
| | - Jie Mei
- College of Fisheries, Huazhong Agricultural University, Wuhan, Hubei Province, 430070, China
| | - Dezhong Wang
- Sheyang Kangyu Aquatic Products Technology Co., Ltd, Yancheng, Jiangsu Province, 224300, China
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6
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Hu Y, Shen Y, Wu X, Ba R, Xu H, Lu K, Shao Y, Sun C, Zhang Y, Miao F, Shen Y, Zhang J. Expression pattern of NLRC5 in the postnatal mouse brain. Acta Histochem 2022; 124:151939. [PMID: 35952483 DOI: 10.1016/j.acthis.2022.151939] [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: 02/17/2022] [Revised: 07/31/2022] [Accepted: 08/01/2022] [Indexed: 12/01/2022]
Abstract
Nucleotide oligomerization domain-like receptors (NLRs), belonging to a large family of pattern recognition receptors, participate in the host's first line of defense against invading pathogens. Caspase recruitment domain containing 5 (NLRC5), the largest member in the NLR family, is demonstrated to be involved in the innate immune response and inflammatory diseases far and wide. Recent studies report that NLRC5 is associated with some central nervous system (CNS) diseases. Besides, NLRC5 is a mastery regulator for the expression of MHC class I both in the immune system and the CNS, while MHC class I is expressed and exerts its function in the brain. Therefore, it is necessary to investigate the expression pattern of NLRC5 in the developing and adult CNS. In our study, postnatal brain sections of C57BL/6 J mice are analyzed for the expression of NLRC5 protein by immunofluorescence. In the postnatal stages of developing telencephalon, NLRC5 exhibits a spatial and temporal expression pattern. NLRC5 is time-specifically expressed in subfields of hippocampus and different layers of prefrontal cortex. Moreover, it is shown that NLRC5 is highly cell type specific. It can be expressed in large quantities by neurons and microglia, but rarely expressed by astrocytes. Taken together, our research is important for further understanding the biological characteristics of NLRC5 and its function in the CNS.
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Affiliation(s)
- Yue Hu
- Key Laboratory of Developmental Genes and Human Disease, Ministry of Education, Southeast University, Nanjing, China
| | - Yi Shen
- Key Laboratory of Developmental Genes and Human Disease, Ministry of Education, Southeast University, Nanjing, China
| | - Xiaojing Wu
- Department of Critical Care Medicine, Zhongda Hospital, Jiangsu Provincial Key Laboratory of Critical Care Medicine, School of Medicine, Southeast University, Nanjing, China
| | - Ru Ba
- Key Laboratory of Developmental Genes and Human Disease, Ministry of Education, Southeast University, Nanjing, China
| | - Hongwei Xu
- Key Laboratory of Developmental Genes and Human Disease, Ministry of Education, Southeast University, Nanjing, China
| | - Keze Lu
- Key Laboratory of Developmental Genes and Human Disease, Ministry of Education, Southeast University, Nanjing, China
| | - Yong Shao
- Key Laboratory of Developmental Genes and Human Disease, Ministry of Education, Southeast University, Nanjing, China
| | - Chen Sun
- Department of Microbiology and Immunology, Medical School, Southeast University, Nanjing, China
| | - Ying Zhang
- Department of Microbiology and Immunology, Medical School, Southeast University, Nanjing, China
| | - Fengqin Miao
- Department of Microbiology and Immunology, Medical School, Southeast University, Nanjing, China
| | - Yuqing Shen
- Department of Microbiology and Immunology, Medical School, Southeast University, Nanjing, China; Department of Critical Care Medicine, Zhongda Hospital, Jiangsu Provincial Key Laboratory of Critical Care Medicine, School of Medicine, Southeast University, Nanjing, China
| | - Jianqiong Zhang
- Key Laboratory of Developmental Genes and Human Disease, Ministry of Education, Southeast University, Nanjing, China; Jiangsu Key Laboratory of Molecular and Functional Imaging, Zhongda Hospital, Medical School, Southeast University, Nanjing, China
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7
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Taylor BC, Balko JM. Mechanisms of MHC-I Downregulation and Role in Immunotherapy Response. Front Immunol 2022; 13:844866. [PMID: 35296095 PMCID: PMC8920040 DOI: 10.3389/fimmu.2022.844866] [Citation(s) in RCA: 79] [Impact Index Per Article: 39.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 02/09/2022] [Indexed: 12/14/2022] Open
Abstract
Immunotherapy has become a key therapeutic strategy in the treatment of many cancers. As a result, research efforts have been aimed at understanding mechanisms of resistance to immunotherapy and how anti-tumor immune response can be therapeutically enhanced. It has been shown that tumor cell recognition by the immune system plays a key role in effective response to T cell targeting therapies in patients. One mechanism by which tumor cells can avoid immunosurveillance is through the downregulation of Major Histocompatibility Complex I (MHC-I). Downregulation of MHC-I has been described as a mechanism of intrinsic and acquired resistance to immunotherapy in patients with cancer. Depending on the mechanism, the downregulation of MHC-I can sometimes be therapeutically restored to aid in anti-tumor immunity. In this article, we will review current research in MHC-I downregulation and its impact on immunotherapy response in patients, as well as possible strategies for therapeutic upregulation of MHC-I.
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Affiliation(s)
- Brandie C. Taylor
- Department of Medicine, Cancer Biology, Vanderbilt University, Nashville, TN, United States
| | - Justin M. Balko
- Department of Medicine, Cancer Biology, Vanderbilt University, Nashville, TN, United States
- Department of Medicine, Hematology and Oncology, Vanderbilt University Medical Center, Nashville, TN, United States
- *Correspondence: Justin M. Balko,
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8
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Structural and Evolutionary Adaptation of NOD-Like Receptors in Birds. BIOMED RESEARCH INTERNATIONAL 2021; 2021:5546170. [PMID: 33997004 PMCID: PMC8105094 DOI: 10.1155/2021/5546170] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/07/2021] [Accepted: 04/20/2021] [Indexed: 11/17/2022]
Abstract
NOD-like receptors (NLRs) are intracellular sensors of the innate immune system that recognize intracellular pathogen-associated molecular patterns (PAMPs) and danger-associated molecular patterns (DAMPs). Little information exists regarding the incidence of positive selection in the evolution of NLRs of birds or the structural differences between bird and mammal NLRs. Evidence of positive selection was identified in four avian NLRs (NOD1, NLRC3, NLRC5, and NLRP3) using the maximum likelihood approach. These NLRs are under different selection pressures which is indicative of different evolution patterns. Analysis of these NLRs showed a lower percentage of codons under positive selection in the LRR domain than seen in the studies of Toll-like receptors (TLRs), suggesting that the LRR domain evolves differently between NLRs and TLRs. Modeling of human, chicken, mammalian, and avian ancestral NLRs revealed the existence of variable evolution patterns in protein structure that may be adaptively driven.
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9
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Xu X, Shi Y, Luan P, Kou W, Li B, Zhai M, You S, Yu Q, Zhuang J, Jian W, Feinberg MW, Peng W. The subcellular redistribution of NLRC5 promotes angiogenesis via interacting with STAT3 in endothelial cells. Theranostics 2021; 11:4483-4501. [PMID: 33754073 PMCID: PMC7977449 DOI: 10.7150/thno.54473] [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: 10/14/2020] [Accepted: 02/09/2021] [Indexed: 12/20/2022] Open
Abstract
Angiogenesis is a critical step in repair of tissue injury. The pattern recognition receptors (PRRs) recognize pathogen and damage associated molecular patterns (DAMPs) during injury and achieve host defense directly. However, the role of NLR family CARD domain containing 5 (NLRC5), an important member of PPRs, beyond host defense in angiogenesis during tissue repair remains unknown. Methods: In vitro, western blot and real-time PCR (RT-PCR) were used to detect the expression of NLRC5 in endothelial cells (ECs). Immunofluorescence microscopy was used to reveal the subcellular location of NLRC5 in ECs. Cell proliferation, wound healing, tube formation assays of ECs were performed to study the role of NLRC5 in angiogenesis. By using Tie2Cre-NLRC5flox/flox mice and bone marrow transplantation studies, we defined an EC-specific role for NLRC5 in angiogenesis. Mechanistically, co-immunoprecipitation studies and RNA sequencing indicated that signal transducer and activator of transcription 3 (STAT3) was the target of NLRC5 in the nucleus. And Co-IP was used to verify the specific domain of NLRC5 binding with STAT3. ChIP assay determined the genes regulated by interaction of STAT3 and NLRC5. Results: Knockdown of NLRC5 in vitro or in vivo inhibited pathological angiogenesis, but had no effect on physiological angiogenesis. NLRC5 was also identified to bind to STAT3 in the nucleus required the integrated death-domain and nucleotide-binding domain (DD+NACHT domain) of NLRC5. And the interaction of STAT3 and NLRC5 could enhance the transcription of angiopoietin-2 (Ang2) and cyclin D1 (CCND1) to participate in angiogenesis. Conclusions: In the ischemic microenvironment, NLRC5 protein accumulates in the nucleus of ECs and enhances STAT3 transcriptional activity for angiogenesis. These findings establish NLRC5 as a novel modulator of VEGFA signaling, providing a new target for angiogenic therapy to foster tissue regeneration.
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10
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Shukla A, Cloutier M, Appiya Santharam M, Ramanathan S, Ilangumaran S. The MHC Class-I Transactivator NLRC5: Implications to Cancer Immunology and Potential Applications to Cancer Immunotherapy. Int J Mol Sci 2021; 22:ijms22041964. [PMID: 33671123 PMCID: PMC7922096 DOI: 10.3390/ijms22041964] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 02/03/2021] [Accepted: 02/08/2021] [Indexed: 12/13/2022] Open
Abstract
The immune system constantly monitors the emergence of cancerous cells and eliminates them. CD8+ cytotoxic T lymphocytes (CTLs), which kill tumor cells and provide antitumor immunity, select their targets by recognizing tumor antigenic peptides presented by MHC class-I (MHC-I) molecules. Cancer cells circumvent immune surveillance using diverse strategies. A key mechanism of cancer immune evasion is downregulation of MHC-I and key proteins of the antigen processing and presentation machinery (APM). Even though impaired MHC-I expression in cancers is well-known, reversing the MHC-I defects remains the least advanced area of tumor immunology. The discoveries that NLRC5 is the key transcriptional activator of MHC-I and APM genes, and genetic lesions and epigenetic modifications of NLRC5 are the most common cause of MHC-I defects in cancers, have raised the hopes for restoring MHC-I expression. Here, we provide an overview of cancer immunity mediated by CD8+ T cells and the functions of NLRC5 in MHC-I antigen presentation pathways. We describe the impressive advances made in understanding the regulation of NLRC5 expression, the data supporting the antitumor functions of NLRC5 and a few reports that argue for a pro-tumorigenic role. Finally, we explore the possible avenues of exploiting NLRC5 for cancer immunotherapy.
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Affiliation(s)
- Akhil Shukla
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada; (A.S.); (M.C.); (M.A.S.); (S.R.)
| | - Maryse Cloutier
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada; (A.S.); (M.C.); (M.A.S.); (S.R.)
| | - Madanraj Appiya Santharam
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada; (A.S.); (M.C.); (M.A.S.); (S.R.)
| | - Sheela Ramanathan
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada; (A.S.); (M.C.); (M.A.S.); (S.R.)
- CRCHUS, Centre Hospitalier de l’Université de Sherbrooke, Sherbrooke, QC J1H5N4, Canada
| | - Subburaj Ilangumaran
- Department of Immunology and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC J1H 5N4, Canada; (A.S.); (M.C.); (M.A.S.); (S.R.)
- CRCHUS, Centre Hospitalier de l’Université de Sherbrooke, Sherbrooke, QC J1H5N4, Canada
- Correspondence: ; Tel.: +1-819-346-1110 (ext. 14834)
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11
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NLRC5/CITA expression correlates with efficient response to checkpoint blockade immunotherapy. Sci Rep 2021; 11:3258. [PMID: 33547395 PMCID: PMC7865024 DOI: 10.1038/s41598-021-82729-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 01/21/2021] [Indexed: 12/17/2022] Open
Abstract
Checkpoint blockade-mediated immunotherapy is emerging as an effective treatment modality for multiple cancer types. However, cancer cells frequently evade the immune system, compromising the effectiveness of immunotherapy. It is crucial to develop screening methods to identify the patients who would most benefit from these therapies because of the risk of the side effects and the high cost of treatment. Here we show that expression of the MHC class I transactivator (CITA), NLRC5, is important for efficient responses to anti-CTLA-4 and anti-PD1 checkpoint blockade therapies. Melanoma tumors derived from patients responding to immunotherapy exhibited significantly higher expression of NLRC5 and MHC class I-related genes compared to non-responding patients. In addition, multivariate analysis that included the number of tumor-associated non-synonymous mutations, predicted neo-antigen load and PD-L2 expression was capable of further stratifying responders and non-responders to anti-CTLA4 therapy. Moreover, expression or methylation of NLRC5 together with total somatic mutation number were significantly correlated with increased patient survival. These results suggest that NLRC5 tumor expression, alone or together with tumor mutation load constitutes a valuable predictive biomarker for both prognosis and response to anti-CTLA-4 and potentially anti-PD1 blockade immunotherapy in melanoma patients.
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12
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Kienes I, Weidl T, Mirza N, Chamaillard M, Kufer TA. Role of NLRs in the Regulation of Type I Interferon Signaling, Host Defense and Tolerance to Inflammation. Int J Mol Sci 2021; 22:1301. [PMID: 33525590 PMCID: PMC7865845 DOI: 10.3390/ijms22031301] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/22/2021] [Accepted: 01/26/2021] [Indexed: 12/12/2022] Open
Abstract
Type I interferon signaling contributes to the development of innate and adaptive immune responses to either viruses, fungi, or bacteria. However, amplitude and timing of the interferon response is of utmost importance for preventing an underwhelming outcome, or tissue damage. While several pathogens evolved strategies for disturbing the quality of interferon signaling, there is growing evidence that this pathway can be regulated by several members of the Nod-like receptor (NLR) family, although the precise mechanism for most of these remains elusive. NLRs consist of a family of about 20 proteins in mammals, which are capable of sensing microbial products as well as endogenous signals related to tissue injury. Here we provide an overview of our current understanding of the function of those NLRs in type I interferon responses with a focus on viral infections. We discuss how NLR-mediated type I interferon regulation can influence the development of auto-immunity and the immune response to infection.
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Affiliation(s)
- Ioannis Kienes
- Department of Immunology, Institute for Nutritional Medicine, University of Hohenheim, 70599 Stuttgart, Germany; (I.K.); (T.W.); (N.M.)
| | - Tanja Weidl
- Department of Immunology, Institute for Nutritional Medicine, University of Hohenheim, 70599 Stuttgart, Germany; (I.K.); (T.W.); (N.M.)
| | - Nora Mirza
- Department of Immunology, Institute for Nutritional Medicine, University of Hohenheim, 70599 Stuttgart, Germany; (I.K.); (T.W.); (N.M.)
| | | | - Thomas A. Kufer
- Department of Immunology, Institute for Nutritional Medicine, University of Hohenheim, 70599 Stuttgart, Germany; (I.K.); (T.W.); (N.M.)
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13
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Cho SX, Vijayan S, Yoo JS, Watanabe T, Ouda R, An N, Kobayashi KS. MHC class I transactivator NLRC5 in host immunity, cancer and beyond. Immunology 2020; 162:252-261. [PMID: 32633419 DOI: 10.1111/imm.13235] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 07/01/2020] [Indexed: 12/12/2022] Open
Abstract
The presentation of antigenic peptides by major histocompatibility complex (MHC) class I and class II molecules is crucial for activation of the adaptive immune system. The nucleotide-binding domain and leucine-rich repeat receptor family members CIITA and NLRC5 function as the major transcriptional activators of MHC class II and class I gene expression, respectively. Since the identification of NLRC5 as the master regulator of MHC class I and class-I-related genes, there have been major advances in understanding the function of NLRC5 in infectious diseases and cancer. Here, we discuss the biological significance and mechanism of NLRC5-dependent MHC class I expression.
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Affiliation(s)
- Steven X Cho
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Saptha Vijayan
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX, USA
| | - Ji-Seung Yoo
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Toshiyuki Watanabe
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Ryota Ouda
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Ning An
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Koichi S Kobayashi
- Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.,Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX, USA
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Avian Pattern Recognition Receptor Sensing and Signaling. Vet Sci 2020; 7:vetsci7010014. [PMID: 32012730 PMCID: PMC7157566 DOI: 10.3390/vetsci7010014] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Revised: 01/16/2020] [Accepted: 01/23/2020] [Indexed: 02/07/2023] Open
Abstract
Pattern recognition receptors (PRRs) are a class of immune sensors that play a critical role in detecting and responding to several conserved patterns of microorganisms. As such, they play a major role in the maintenance of immune homeostasis and anti-microbial defense. Fundamental knowledge pertaining to the discovery of PRR functions and their ligands continue to advance the understanding of immune system and disease resistance, which led to the rational design and/or application of various PRR ligands as vaccine adjuvants. In addition, the conserved nature of many PRRs throughout the animal kingdom has enabled the utilization of the comparative genomics approach in PRR identification and the study of evolution, structural features, and functions in many animal species including avian. In the present review, we focused on PRR sensing and signaling functions in the avian species, domestic chicken, mallard, and domestic goose. In addition to summarizing recent advances in the understanding of avian PRR functions, the present review utilized a comparative biology approach to identify additional PRRs, whose functions have been well studied in mammalians but await functional characterization in avian.
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Abstract
Recent decades, there is significant progress in understanding the mechanisms of tumor progression and immune evasion. The newly discovered protein NLRC5 is demonstrated to participate in regulating cancer immune escape through enhancing MHC class I genes expression in certain tumors. Nevertheless, increasing evidence has revealed that NLRC5 is up-regulated in some other tumors and promote tumor development and progression. The purpose of this review is to describe the role of NLRC5 in tumors and discuss whether NLRC5 can be a potential target in cancer treatment.
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Affiliation(s)
- Feng Tang
- Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, 678 Fu Rong Road, Hefei, 230601, Anhui, China.
- Cerebral Vascular Disease Research Center, Anhui Medical University, Hefei, 230601, China.
| | - Yadi Xu
- Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, 678 Fu Rong Road, Hefei, 230601, Anhui, China
- Cerebral Vascular Disease Research Center, Anhui Medical University, Hefei, 230601, China
| | - Bing Zhao
- Department of Neurosurgery, The Second Affiliated Hospital of Anhui Medical University, 678 Fu Rong Road, Hefei, 230601, Anhui, China.
- Cerebral Vascular Disease Research Center, Anhui Medical University, Hefei, 230601, China.
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16
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Distinct epigenetic profiles in children with perinatally-acquired HIV on antiretroviral therapy. Sci Rep 2019; 9:10495. [PMID: 31324826 PMCID: PMC6642153 DOI: 10.1038/s41598-019-46930-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 07/02/2019] [Indexed: 12/11/2022] Open
Abstract
Perinatally-acquired HIV has persistent effects on long-term health outcomes, even after early treatment. We hypothesize that epigenetic indicators, such as DNA methylation, may elucidate cellular processes that explain these effects. Here, we compared DNA methylation profiles in whole blood from 120 HIV-infected children on antiretroviral therapy (ART) and 60 frequency age-matched HIV-uninfected children aged 4–9 years in Johannesburg, South Africa. Using an individual CpG site approach, we found 1,309 differentially-methylated (DM) CpG sites between groups, including 1,271 CpG sites that were hyper-methylated in the HIV-infected group and 38 CpG sites that were hypo-methylated in the HIV-infected group. Six hyper-methylated CpG sites were in EBF4, which codes for a transcription factor involved in B-cell maturation. The top hypomethylated site was in the promoter region of NLRC5, encoding a transcription factor that regulates major histocompatibility complex (MHC) class I molecule expression. Using a differentially-methylated region (DMR) approach, we found 315 DMRs between groups, including 28 regions encompassing 686 CpG sites on chromosome 6. A large number of the genes identified in both the CpG site and DMR approaches were located in the MHC region on chromosome 6, which plays an important role in the adaptive immune system. This study provides the first evidence that changes in the epigenome are detectable in children with perinatally-acquired HIV infection on suppressive ART started at an early age.
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17
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Luan P, Jian W, Xu X, Kou W, Yu Q, Hu H, Li D, Wang W, Feinberg MW, Zhuang J, Xu Y, Peng W. NLRC5 inhibits neointima formation following vascular injury and directly interacts with PPARγ. Nat Commun 2019; 10:2882. [PMID: 31253783 PMCID: PMC6599027 DOI: 10.1038/s41467-019-10784-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Accepted: 05/29/2019] [Indexed: 12/16/2022] Open
Abstract
NLR Family CARD Domain Containing 5 (NLRC5), an important immune regulator in innate immunity, is involved in regulating inflammation and antigen presentation. However, the role of NLRC5 in vascular remodeling remains unknown. Here we report the role of NLRC5 on vascular remodeling and provide a better understanding of its underlying mechanism. Nlrc5 knockout (Nlrc5−/−) mice exhibit more severe intimal hyperplasia compared with wild-type mice after carotid ligation. Ex vivo data shows that NLRC5 deficiency leads to increased proliferation and migration of human aortic smooth muscle cells (HASMCs). NLRC5 binds to PPARγ and inhibits HASMC dedifferentiation. NACHT domain of NLRC5 is essential for the interaction with PPARγ and stimulation of PPARγ activity. Pioglitazone significantly rescues excessive intimal hyperplasia in Nlrc5−/− mice and attenuates the increased proliferation and dedifferentiation in NLRC5-deficient HASMCs. Our study demonstrates that NLRC5 regulates vascular remodeling by directly inhibiting SMC dysfunction via its interaction with PPARγ. NLRC5 is known for its role in inflammation and antigen presentation. Here Luan et al. find that NLRC5 protects mice from intimal hyperplasia following vascular injury, and regulates the response of vascular smooth muscle cells to injury through direct interaction with PPARγ.
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Affiliation(s)
- Peipei Luan
- Department of Cardiology, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, 200072, China.,Department of Endocrinology, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Weixia Jian
- Department of Endocrinology, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Xu Xu
- Department of Cardiology, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, 200072, China
| | - Wenxin Kou
- Department of Cardiology, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, 200072, China
| | - Qing Yu
- Department of Cardiology, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, 200072, China
| | - Handan Hu
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Dali Li
- Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, 200241, China
| | - Wei Wang
- Columbia Center for Translational Immunology, Columbia University Medical Center, New York, 10032, USA
| | - Mark W Feinberg
- Cardiovascular Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, 02115, USA
| | - Jianhui Zhuang
- Department of Cardiology, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, 200072, China.
| | - Yawei Xu
- Department of Cardiology, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, 200072, China.
| | - Wenhui Peng
- Department of Cardiology, Shanghai Tenth People's Hospital, School of Medicine, Tongji University, Shanghai, 200072, China.
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18
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Vijayan S, Sidiq T, Yousuf S, van den Elsen PJ, Kobayashi KS. Class I transactivator, NLRC5: a central player in the MHC class I pathway and cancer immune surveillance. Immunogenetics 2019; 71:273-282. [PMID: 30706093 DOI: 10.1007/s00251-019-01106-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 01/10/2019] [Indexed: 12/19/2022]
Abstract
Major histocompatibility complex (MHC) class I and class II molecules play critical roles in the activation of the adaptive immune system by presenting antigens to CD8+ and CD4+ T cells, respectively. Although it has been well known that CIITA (MHC class II transactivator), an NLR (nucleotide-binding domain, leucine-rich-repeat containing) protein, as a master regulator of MHC class II gene expression, the mechanism of MHC class I gene transactivation was unclear. Recently, another NLR protein, NLRC5 (NLR family, CARD domain-containing 5), was identified as an MHC class I transactivator (CITA). NLRC5 is a critical regulator for the transcriptional activation of MHC class I genes and other genes involved in the MHC class I antigen presentation pathway. CITA/NLRC5 plays a crucial role in human cancer immunity through the recruitment and activation of tumor killing CD8+ T cells. Here, we discuss the molecular function and mechanism of CITA/NLRC5 in the MHC class I pathway and its role in cancer.
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Affiliation(s)
- Saptha Vijayan
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX, 77843, USA
| | - Tabasum Sidiq
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX, 77843, USA
| | - Suhail Yousuf
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX, 77843, USA
| | - Peter J van den Elsen
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, The Netherlands.,Department of Pathology, VU University Medical Center, Amsterdam, The Netherlands
| | - Koichi S Kobayashi
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX, 77843, USA. .,Department of Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan.
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19
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Wang Q, Ding H, He Y, Li X, Cheng Y, Xu Q, Yang Y, Liao G, Meng X, Huang C, Li J. NLRC5 mediates cell proliferation, migration, and invasion by regulating the Wnt/β-catenin signalling pathway in clear cell renal cell carcinoma. Cancer Lett 2018; 444:9-19. [PMID: 30543814 DOI: 10.1016/j.canlet.2018.11.024] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Revised: 11/03/2018] [Accepted: 11/21/2018] [Indexed: 12/12/2022]
Abstract
NLRC5, a newly discovered member of the NLR family, has been reported to regulate immune responses and promote cell proliferation, migration, and invasion in hepatocellular carcinoma. However, to date, the potential regulatory roles and molecular mechanisms by which NLRC5 affects the development and progression of clear cell renal cell carcinoma (ccRCC) remain largely unknown. In this study, human clinical data from The Cancer Genome Atlas database revealed that increased NLRC5 expression was associated with advanced stage and poor prognosis in ccRCC patients. Moreover, experimental results showed that NLRC5 is aberrantly overexpressed in human ccRCC tissues and cell lines. Depletion of NLRC5 attenuated ccRCC cell proliferation, migration, and invasion and suppressed ccRCC growth in a nude mouse model. By contrast, overexpression of NLRC5 promoted the proliferation, migration, and invasion of ccRCC cells in vitro. Additionally, NLRC5 expression is not only positively correlated with β-catenin but also coordinates the activation of the downstream Wnt/β-catenin signalling pathway. Together, our data suggest that NLRC5 may be a potential therapeutic target for ccRCC therapy.
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Affiliation(s)
- Qin Wang
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, 230032, China; Institute for Liver Diseases of Anhui Medical University, Hefei, 230032, China
| | - Handong Ding
- Department of Urology, The First Affiliated Hospital of Anhui Medical University, Hefei, 230032, China; Institute of Urology, Anhui Medical University, Hefei, 230032, China; Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, China
| | - Yinghua He
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, 230032, China; Institute for Liver Diseases of Anhui Medical University, Hefei, 230032, China
| | - Xiaofeng Li
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, 230032, China; Institute for Liver Diseases of Anhui Medical University, Hefei, 230032, China
| | - Yahui Cheng
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, 230032, China; Institute for Liver Diseases of Anhui Medical University, Hefei, 230032, China
| | - Qingqing Xu
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, 230032, China; Institute for Liver Diseases of Anhui Medical University, Hefei, 230032, China
| | - Yue Yang
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, 230032, China; Institute for Liver Diseases of Anhui Medical University, Hefei, 230032, China
| | - Guiyi Liao
- Department of Urology, The First Affiliated Hospital of Anhui Medical University, Hefei, 230032, China; Institute of Urology, Anhui Medical University, Hefei, 230032, China; Anhui Province Key Laboratory of Genitourinary Diseases, Anhui Medical University, China
| | - Xiaoming Meng
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, 230032, China; Institute for Liver Diseases of Anhui Medical University, Hefei, 230032, China
| | - Cheng Huang
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, 230032, China; Institute for Liver Diseases of Anhui Medical University, Hefei, 230032, China.
| | - Jun Li
- Anhui Province Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, Anhui Medical University, Hefei, 230032, China; The Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, Hefei, 230032, China; Institute for Liver Diseases of Anhui Medical University, Hefei, 230032, China.
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20
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Tilburgs T, Meissner TB, Ferreira LMR, Mulder A, Musunuru K, Ye J, Strominger JL. NLRP2 is a suppressor of NF-ƙB signaling and HLA-C expression in human trophoblasts†,‡. Biol Reprod 2018; 96:831-842. [PMID: 28340094 DOI: 10.1093/biolre/iox009] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 02/28/2017] [Indexed: 01/06/2023] Open
Abstract
During pregnancy, fetal extravillous trophoblasts (EVT) play a key role in the regulation of maternal T cell and NK cell responses. EVT display a unique combination of human leukocyte antigens (HLA); EVT do not express HLA-A and HLA-B, but do express HLA-C, HLA-E, and HLA-G. The mechanisms establishing this unique HLA expression pattern have not been fully elucidated. The major histocompatibility complex (MHC) class I and class II transcriptional activators NLRC5 and CIITA are expressed neither by EVT nor by the EVT model cell line JEG3, which has an MHC expression pattern identical to that of EVT. Therefore, other MHC regulators must be present to control HLA-C, HLA-E, and HLA-G expression in these cells. CIITA and NLRC5 are both members of the nucleotide-binding domain, leucine-rich repeat (NLR) family of proteins. Another member of this family, NLRP2, is highly expressed by EVT and JEG3, but not in maternal decidual stromal cells. In this study, transcription activator-like effector nuclease technology was used to delete NLRP2 in JEG3. Furthermore, lentiviral delivery of shRNA was used to knockdown NLRP2 in JEG3 and primary EVT. Upon NLRP2 deletion, Tumor Necrosis Factor-α (TNFα)-induced phosphorylation of NF-KB p65 increased in JEG3 and EVT, and more surprisingly a significant increase in constitutive HLA-C expression was observed in JEG3. These data suggest a broader role for NLR family members in the regulation of MHC expression during inflammation, thus forming a bridge between innate and adaptive immune responses. As suppressor of proinflammatory responses, NLRP2 may contribute to preventing unwanted antifetal responses.
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Affiliation(s)
- Tamara Tilburgs
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, Massachusetts, USA
| | - Torsten B Meissner
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, Massachusetts, USA
| | - Leonardo M R Ferreira
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, Massachusetts, USA.,Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts, USA
| | - Arend Mulder
- Department of Immunohematology and Blood transfusion, Leiden University Medical Center, Leiden, Netherlands
| | - Kiran Musunuru
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, Massachusetts, USA
| | - Junqiang Ye
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts, USA.,Department of Biochemistry and Molecular Biophysics, Columbia University Medical Center, New York, New York, USA
| | - Jack L Strominger
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, Massachusetts, USA
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21
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Zeng Q, Chen X, Ning C, Zhu Q, Yao Y, Zhao Y, Luan F. Methylation of the genes ROD1, NLRC5, and HKR1 is associated with aging in Hainan centenarians. BMC Med Genomics 2018; 11:7. [PMID: 29394898 PMCID: PMC5797414 DOI: 10.1186/s12920-018-0334-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 01/25/2018] [Indexed: 12/18/2022] Open
Abstract
Background Human aging is a hot topic in biology, and it has been associated with DNA methylation changes at specific genomic sites. We aimed to study the changes of DNA methylation at a single-CpG-site resolution using peripheral blood samples from centenarians. Methods Using Illumina 450 K Methylation BeadChip microarray assays, we carried out a pool-based, epigenome-wide investigation of DNA methylation of blood samples from 12 centenarians and 12 healthy controls. Differentially methylated cytosine-phosphate-guanosine (CpG) sites were selected for further pyrosequencing analysis of blood samples from 30 centenarians and 30 healthy controls. Result We identified a total of 31 high-confidence CpG sites with differential methylation profiles between the groups: 9 (29%) were hypermethylated and 22 (71%) were hypomethylated in centenarians. It was also found that hypermethylation of HKR1 and hypomethylation of ROD1 and NLRC5 genes strongly correlated with age in centenarians. Conclusion Our results indicate that the methylation profile combination of HKR1, ROD1, and NLRC5 could be a promising biomarker for aging in Hainan centenarians. Electronic supplementary material The online version of this article (10.1186/s12920-018-0334-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Qian Zeng
- Hainan branch of PLA General Hospital, Sanya, 572000, China
| | - Xiaoping Chen
- Hainan branch of PLA General Hospital, Sanya, 572000, China
| | - Chaoxue Ning
- Hainan branch of PLA General Hospital, Sanya, 572000, China
| | - Qiao Zhu
- Hainan branch of PLA General Hospital, Sanya, 572000, China
| | - Yao Yao
- Hainan branch of PLA General Hospital, Sanya, 572000, China
| | - Yali Zhao
- Hainan branch of PLA General Hospital, Sanya, 572000, China.
| | - Fuxin Luan
- Hainan branch of PLA General Hospital, Sanya, 572000, China.
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22
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Jongsma MLM, Guarda G, Spaapen RM. The regulatory network behind MHC class I expression. Mol Immunol 2017; 113:16-21. [PMID: 29224918 DOI: 10.1016/j.molimm.2017.12.005] [Citation(s) in RCA: 103] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 11/28/2017] [Accepted: 12/05/2017] [Indexed: 12/22/2022]
Abstract
The MHC class I pathway, presenting endogenously derived peptides to T lymphocytes, is hijacked in many pathological conditions. This affects MHC class I levels and peptide presentation at the cell surface leading to immune escape of cancer cells or microbes. It is therefore important to identify the molecular mechanisms behind MHC class I expression, processing and antigen presentation. The identification of NLRC5 as regulator of MHC class I transcription was a huge step forward in understanding the transcriptional mechanism involved. Nevertheless, many questions concerning MHC class I transcription are yet unsolved. Here we illuminate current knowledge on MHC class I and NLRC5 transcription, we highlight some remaining questions and discuss the use of quickly developing high-content screening tools to reveal unknowns in MHC class I transcription in the near future.
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Affiliation(s)
- Marlieke L M Jongsma
- Department of Immunopathology, Sanquin Research and Landsteiner Laboratory AMC/UvA, Plesmanlaan 125, 1066 CX Amsterdam, The Netherlands
| | - Greta Guarda
- Department of Biochemistry, University of Lausanne, 1066 Epalinges, Switzerland
| | - Robbert M Spaapen
- Department of Immunopathology, Sanquin Research and Landsteiner Laboratory AMC/UvA, Plesmanlaan 125, 1066 CX Amsterdam, The Netherlands.
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23
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NLRC5/CITA: A Key Player in Cancer Immune Surveillance. Trends Cancer 2017; 3:28-38. [PMID: 28718425 DOI: 10.1016/j.trecan.2016.12.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 12/05/2016] [Accepted: 12/06/2016] [Indexed: 12/31/2022]
Abstract
Cancer cells need to escape immune surveillance for successful tumor growth. Loss of MHC class I has been described as a major immune evasion strategy in many cancers. MHC class I transactivator (CITA), NLRC5 [nucleotide-binding domain and leucine-rich repeats containing (NLR) family, caspase activation and recruitment domain (CARD) domain containing 5], is a key transcription coactivator of MHC class I genes. Recent genetic studies have revealed that NLRC5 is a major target for cancer immune evasion mechanisms. The reduced expression or activity of NLRC5 caused by promoter methylation, copy number loss, or somatic mutations is associated with defective MHC class I expression, impaired cytotoxic T cell activation, and poor patient prognosis. Here, we review the role of NLRC5 in cancer immune evasion and the future prospects for cancer research.
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24
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Chelbi S, Dang A, Guarda G. Emerging Major Histocompatibility Complex Class I-Related Functions of NLRC5. Adv Immunol 2017; 133:89-119. [DOI: 10.1016/bs.ai.2016.11.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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25
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Sidiq T, Yoshihama S, Downs I, Kobayashi KS. Nod2: A Critical Regulator of Ileal Microbiota and Crohn's Disease. Front Immunol 2016; 7:367. [PMID: 27703457 PMCID: PMC5028879 DOI: 10.3389/fimmu.2016.00367] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 09/06/2016] [Indexed: 12/19/2022] Open
Abstract
The human intestinal tract harbors large bacterial community consisting of commensal, symbiotic, and pathogenic strains, which are constantly interacting with the intestinal immune system. This interaction elicits a non-pathological basal level of immune responses and contributes to shaping both the intestinal immune system and bacterial community. Recent studies on human microbiota are revealing the critical role of intestinal bacterial community in the pathogenesis of both systemic and intestinal diseases, including Crohn’s disease (CD). NOD2 plays a key role in the regulation of microbiota in the small intestine. NOD2 is highly expressed in ileal Paneth cells that provide critical mechanism for the regulation of ileal microbiota through the secretion of anti-bacterial compounds. Genome mapping of CD patients revealed that loss of function mutations in NOD2 are associated with ileal CD. Genome-wide association studies further demonstrated that NOD2 is one of the most critical genetic factor linked to ileal CD. The bacterial community in the ileum is indeed dysregulated in Nod2-deficient mice. Nod2-deficient ileal epithelia exhibit impaired ability of killing bacteria. Thus, altered interactions between ileal microbiota and mucosal immunity through NOD2 mutations play significant roles in the disease susceptibility and pathogenesis in CD patients, thereby depicting NOD2 as a critical regulator of ileal microbiota and CD.
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Affiliation(s)
- Tabasum Sidiq
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M University , College Station, TX , USA
| | - Sayuri Yoshihama
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M University , College Station, TX , USA
| | - Isaac Downs
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M University , College Station, TX , USA
| | - Koichi S Kobayashi
- Department of Microbial Pathogenesis and Immunology, College of Medicine, Texas A&M University , College Station, TX , USA
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26
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Guo XM, Liu XP, Chang GB, Xu L, Bi YL, Wang HZ, Zhang Y, Zhu PF, Wu Y, Chen GH. Characterization of the NLRC5 promoter in chicken: SNPs, regulatory elements and CpG islands. Anim Genet 2016; 47:579-87. [PMID: 27429394 DOI: 10.1111/age.12450] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/24/2016] [Indexed: 01/07/2023]
Abstract
NLRC5 plays an important role in the innate immunity and cellular immunity in many species, but the regulatory mechanism of NLRC5 expression in chickens remains unclear. In this study, a series of deletion fragments of the NLRC5 promoter region were constructed and dual-luciferase assay was performed. Then, we detected the SNP in the core region and its function. Important transcriptional regulatory elements were predicted and identified. Methylation of CpG islands was measured. The results revealed that the two core regions of -4372 to -3756 and -2925 to -2265 in the NLRC5 promoter were essential for NLRC5 mRNA expression in which a SNP (A/G), located at -2470, was found to have an effect on the transcriptional activity. Also, the STAT1 element in the second core region of the NLRC5 promoter was identified to bind with the STAT1 transcription factor, which was necessary for the transcriptional activity. In addition, many other elements in the NLRC5 promoter, including YY1 and CEBP, may contribute significantly to the expression activity of NLRC5. Moreover, two CpG islands were searched. Part of one was located in the first core region, which suggests that epigenetic modification may regulate the activity of the first promoter region, and the other was mostly in an unmethylated state. Collectively, these results suggest the complex regulation of NLRC5 expression includes SNPs, transcription factors and methylation.
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Affiliation(s)
- X M Guo
- College of Animal Science & Technology, Yangzhou University, Yangzhou, 225009, China
| | - X P Liu
- Chinese Academy of Agricultural Sciences, Poultry Institute, Yangzhou, 225003, China
| | - G B Chang
- College of Animal Science & Technology, Yangzhou University, Yangzhou, 225009, China.
| | - L Xu
- College of Animal Science & Technology, Yangzhou University, Yangzhou, 225009, China
| | - Y L Bi
- College of Animal Science & Technology, Yangzhou University, Yangzhou, 225009, China
| | - H Z Wang
- Chinese Academy of Agricultural Sciences, Poultry Institute, Yangzhou, 225003, China
| | - Y Zhang
- College of Animal Science & Technology, Yangzhou University, Yangzhou, 225009, China
| | - P F Zhu
- College of Animal Science & Technology, Yangzhou University, Yangzhou, 225009, China
| | - Y Wu
- College of Animal Science & Technology, Yangzhou University, Yangzhou, 225009, China
| | - G H Chen
- College of Animal Science & Technology, Yangzhou University, Yangzhou, 225009, China
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Downs I, Vijayan S, Sidiq T, Kobayashi KS. CITA/NLRC5: A critical transcriptional regulator of MHC class I gene expression. Biofactors 2016; 42:349-57. [PMID: 27087581 DOI: 10.1002/biof.1285] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 03/07/2016] [Accepted: 03/09/2016] [Indexed: 01/01/2023]
Abstract
Major histocompatibility complex (MHC) class I and class II molecules play essential roles in the development and activation of the human adaptive immune system. An NLR protein, CIITA (MHC class II transactivator) has been recognized as a master regulator of MHC class II gene expression, albeit knowledge about the regulatory mechanism of MHC class I gene expression had been limited. Recently identified MHC class I transactivator (CITA), or NLRC5, also belongs to the NLR protein family and constitutes a critical regulator for the transcriptional activation of MHC class I genes. In addition to MHC class I genes, CITA/NLRC5 induces the expression of β2 -microglobulin, TAP1 and LMP2, essential components of the MHC class I antigen presentation pathway. Therefore, CITA/NLRC5 and CIITA are transcriptional regulators that orchestrate the concerted expression of critical components in the MHC class I and class II pathways, respectively. © 2016 BioFactors, 42(4):349-357, 2016.
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Affiliation(s)
- Isaac Downs
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX
| | - Saptha Vijayan
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX
| | - Tabasum Sidiq
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX
| | - Koichi S Kobayashi
- Department of Microbial Pathogenesis and Immunology, Texas A&M Health Science Center, College Station, TX
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NLRC5/MHC class I transactivator is a target for immune evasion in cancer. Proc Natl Acad Sci U S A 2016; 113:5999-6004. [PMID: 27162338 DOI: 10.1073/pnas.1602069113] [Citation(s) in RCA: 180] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Cancer cells develop under immune surveillance, thus necessitating immune escape for successful growth. Loss of MHC class I expression provides a key immune evasion strategy in many cancers, although the molecular mechanisms remain elusive. MHC class I transactivator (CITA), known as "NLRC5" [NOD-like receptor (NLR) family, caspase recruitment (CARD) domain containing 5], has recently been identified as a critical transcriptional coactivator of MHC class I gene expression. Here we show that the MHC class I transactivation pathway mediated by CITA/NLRC5 constitutes a target for cancer immune evasion. In all the 21 tumor types we examined, NLRC5 expression was highly correlated with the expression of MHC class I, with cytotoxic T-cell markers, and with genes in the MHC class I antigen-presentation pathway, including LMP2/LMP7, TAP1, and β2-microglobulin. Epigenetic and genetic alterations in cancers, including promoter methylation, copy number loss, and somatic mutations, were most prevalent in NLRC5 among all MHC class I-related genes and were associated with the impaired expression of components of the MHC class I pathway. Strikingly, NLRC5 expression was significantly associated with the activation of CD8(+) cytotoxic T cells and patient survival in multiple cancer types. Thus, NLRC5 constitutes a novel prognostic biomarker and potential therapeutic target of cancers.
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29
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Rodriguez GM, Bobbala D, Serrano D, Mayhue M, Champagne A, Saucier C, Steimle V, Kufer TA, Menendez A, Ramanathan S, Ilangumaran S. NLRC5 elicits antitumor immunity by enhancing processing and presentation of tumor antigens to CD8(+) T lymphocytes. Oncoimmunology 2016; 5:e1151593. [PMID: 27471621 PMCID: PMC4938303 DOI: 10.1080/2162402x.2016.1151593] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 01/18/2016] [Accepted: 02/01/2016] [Indexed: 11/10/2022] Open
Abstract
Cancers can escape immunesurveillance by diminishing the expression of MHC class-I molecules (MHC-I) and components of the antigen-processing machinery (APM). Developing new approaches to reverse these defects could boost the efforts to restore antitumor immunity. Recent studies have shown that the expression of MHC-I and antigen-processing molecules is transcriptionally regulated by NOD-like receptor CARD domain containing 5 (NLRC5). To investigate whether NLRC5 could be used to improve tumor immunogenicity, we established stable lines of B16-F10 melanoma cells expressing NLRC5 (B16-5), the T cell co-stimulatory molecule CD80 (B16-CD80) or both (B16-5/80). Cells harboring NLRC5 constitutively expressed MHC-I and LMP2, LMP7 and TAP1 genes of the APM. The B16-5 cells efficiently presented the melanoma antigenic peptide gp10025–33 to Pmel-1 TCR transgenic CD8+ T cells and induced their proliferation. In the presence of CD80, B16-5 cells stimulated Pmel-1 cells even without the addition of gp100 peptide, indicating that NLRC5 facilitated the processing and presentation of endogenous tumor antigen. Upon subcutaneous implantation, B16-5 cells showed markedly reduced tumor growth in C57BL/6 hosts but not in immunodeficient hosts, indicating that the NLRC5-expressing tumor cells elicited antitumor immunity. Following intravenous injection, B16-5 and B16-5/80 cells formed fewer lung tumor foci compared to control cells. In mice depleted of CD8+ T cells, B16-5 cells formed large subcutaneous and lung tumors. Finally, immunization with irradiated B16-5 cells conferred protection against challenge by parental B16 cells. Collectively, our findings indicate that NLRC5 could be exploited to restore tumor immunogenicity and to stimulate protective antitumor immunity.
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Affiliation(s)
| | | | | | | | - Audrey Champagne
- Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke , Sherbrooke, Quebec, Canada
| | - Caroline Saucier
- Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada; CRCHUS, Sherbrooke, Québec, Canada
| | - Viktor Steimle
- Department of Biology, Faculty of Sciences, Université de Sherbrooke , Sherbrooke, Quebec, Canada
| | - Thomas A Kufer
- Department of Immunology, Institute of Nutritional Medicine, University of Hohenheim , Stuttgart, Germany
| | - Alfredo Menendez
- CRCHUS, Sherbrooke, Québec, Canada; Department of Microbiology and Infectious diseases, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Sheela Ramanathan
- Immunology division, Department of Pediatrics; CRCHUS, Sherbrooke, Québec, Canada
| | - Subburaj Ilangumaran
- Immunology division, Department of Pediatrics; CRCHUS, Sherbrooke, Québec, Canada
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Abstract
Pattern recognition receptors, including members of the NLR and PYHIN families, are essential for recognition of both pathogen- and host-derived danger signals. A number of molecules in these families are capable of forming multiprotein complexes termed inflammasomes that result in the activation of caspase-1. In addition to NLRP1, NLRP3, NLRC4, and AIM2, which form well-described inflammasome complexes, IFI16, NLRP6, NLRP7, NLRP12, and NLRC5 have also been proposed to form inflammasomes under specific conditions. The structure and function of these atypical inflammasomes will be highlighted here.
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Affiliation(s)
- Ann M Janowski
- Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA, USA
| | - Fayyaz S Sutterwala
- Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA, USA.
- Inflammation Program, Department of Internal Medicine, University of Iowa Carver College of Medicine, 2501 Crosspark Road, D156 MTF, Iowa City, IA, 52241, USA.
- Veterans Affairs Medical Center, Iowa City, IA, USA.
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31
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Li X, Guo F, Liu Y, Chen HJ, Wen F, Zou B, Li D, Qin Q, Liu X, Shen Y, Wang Y. NLRC5 expression in tumors and its role as a negative prognostic indicator in stage III non-small-cell lung cancer patients. Oncol Lett 2015; 10:1533-1540. [PMID: 26622704 DOI: 10.3892/ol.2015.3471] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 05/20/2015] [Indexed: 02/05/2023] Open
Abstract
Major histocompatibility complex (MHC) class I molecules have a crucial role in tumor immune evasion; however, the association of MHC class I molecules with outcomes in cancer patients remains controversial. Nucleotide-binding oligomerization-like receptor family caspase recruitment domain-containing 5 (NLRC5) has been reported to be a MHC class I transactivator. However, the expression and function of NLRC5 in cancer remains to be elucidated. The present study aimed to retrospectively examine NLRC5 expression in human tumor tissues and its association with clinical outcomes of non-small-cell lung cancer (NSCLC) stage III patients. The expression of MHC class I and NLRC5 in NSCLC were detected using immunohistochemistry (IHC). The association between their expression levels was assessed using the Pearson's χ2 test and their association with survival was assessed using Kaplan-Meier analysis and the log-rank test. In addition, the expression of NLRC5 and MHC class I were examined in 323 cases of seven other types of tumors and their correlations were studied. The results revealed that the expression of NLRC5 was correlated with that of MHC class I in NSCLC patients (P=0.008). MHC class I-positive and nuclear NLRC5-positive NSCLC patients were found to have shorter overall survival (OS) rates (log-rank, P=0.032 and P=0.039, respectively). In addition, in the seven different tumor types, there was a significant correlation between MHC class I and NLRC5 nuclear expression (P<0.001) as well as MHC class I and NLRC5 cytoplasmic expression (P=0.003). In conclusion, NLRC5 was demonstrated to be widely expressed in eight tumor tissues and its expression was correlated with that of MHC class I. Of note, nuclear NLRC5-negative and MHC class I-negative stage III NSCLC patients had improved OS rates compared to those with positive expression. Therefore, NLRC5 and MHC class I may be negative prognostic indicators in NSCLC stage III patients.
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Affiliation(s)
- Xiaoyu Li
- Department of Thoracic Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Fuchun Guo
- Department of Thoracic Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Yongmei Liu
- Department of Thoracic Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Hui-Jiao Chen
- Department of Pathology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Feng Wen
- Department of Thoracic Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Binwen Zou
- Department of Thoracic Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Dan Li
- Department of Thoracic Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Qin Qin
- Department of Thoracic Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Xiaoke Liu
- Department of Thoracic Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Yali Shen
- Department of Abdomen Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Yongsheng Wang
- Department of Thoracic Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
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32
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Radian AD, Khare S, Chu LH, Dorfleutner A, Stehlik C. ATP binding by NLRP7 is required for inflammasome activation in response to bacterial lipopeptides. Mol Immunol 2015; 67:294-302. [PMID: 26143398 DOI: 10.1016/j.molimm.2015.06.013] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Revised: 06/11/2015] [Accepted: 06/15/2015] [Indexed: 02/07/2023]
Abstract
Nucleotide-binding oligimerization domain (NOD)-like receptors (NLRs) are pattern recognition receptors (PRRs) involved in innate immune responses. NLRs encode a central nucleotide-binding domain (NBD) consisting of the NAIP, CIITA, HET-E and TP1 (NACHT) domain and the NACHT associated domain (NAD), which facilitates receptor oligomerization and downstream inflammasome signaling. The NBD contains highly conserved regions, known as Walker motifs, that are required for nucleotide binding and hydrolysis. The NLR containing a PYRIN domain (PYD) 7 (NLRP7) has been recently shown to assemble an ASC and caspase-1-containing high molecular weight inflammasome complex in response to microbial acylated lipopeptides and Staphylococcus aureus infection. However, the molecular mechanism responsible for NLRP7 inflammasome activation is still elusive. Here we demonstrate that the NBD of NLRP7 is an ATP binding domain and has ATPase activity. We further show that an intact nucleotide-binding Walker A motif is required for NBD-mediated nucleotide binding and hydrolysis, oligomerization, and NLRP7 inflammasome formation and activity. Accordingly, THP-1 cells expressing a mutated Walker A motif display defective NLRP7 inflammasome activation, interleukin (IL)-1β release and pyroptosis in response to acylated lipopeptides and S. aureus infection. Taken together, our results provide novel insights into the mechanism of NLRP7 inflammasome assembly.
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Affiliation(s)
- Alexander D Radian
- Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA; Driskill Graduate Program in Life Sciences (DGP), Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Sonal Khare
- Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Lan H Chu
- Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA; Driskill Graduate Program in Life Sciences (DGP), Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Andrea Dorfleutner
- Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
| | - Christian Stehlik
- Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA; Robert H. Lurie Comprehensive Cancer Center, Interdepartmental Immunobiology Center and Skin Disease Research Center, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
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33
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Ranjan P, Singh N, Kumar A, Neerincx A, Kremmer E, Cao W, Davis WG, Katz JM, Gangappa S, Lin R, Kufer TA, Sambhara S. NLRC5 interacts with RIG-I to induce a robust antiviral response against influenza virus infection. Eur J Immunol 2015; 45:758-72. [PMID: 25404059 PMCID: PMC11298762 DOI: 10.1002/eji.201344412] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 10/15/2014] [Accepted: 11/13/2014] [Indexed: 12/16/2023]
Abstract
The NLR protein, NLRC5 is an important regulator of MHC class I gene expression, however, the role of NLRC5 in other innate immune responses is less well defined. In the present study, we report that NLRC5 binds RIG-I and that this interaction is critical for robust antiviral responses against influenza virus. Overexpression of NLRC5 in the human lung epithelial cell line, A549, and normal human bronchial epithelial cells resulted in impaired replication of influenza virus A/Puerto Rico/8/34 virus (PR8) and enhanced IFN-β expression. Influenza virus leads to induction of IFN-β that drives RIG-I and NLRC5 expression in host cells. Our results suggest that NLRC5 extends and stabilizes influenza virus induced RIG-I expression and delays expression of the viral inhibitor protein NS1. We show that NS1 binds to NLRC5 to suppress its function. Interaction domain mapping revealed that NLRC5 interacts with RIG-I via its N-terminal death domain and that NLRC5 enhanced antiviral activity in an leucine-rich repeat domain independent manner. Taken together, our findings identify a novel role for NLRC5 in RIG-I-mediated antiviral host responses against influenza virus infection, distinguished from the role of NLRC5 in MHC class I gene regulation.
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Affiliation(s)
- Priya Ranjan
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Neetu Singh
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Amrita Kumar
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | | | - Elisabeth Kremmer
- Helmholtz Zentrum München, Institute of Molecular Immunology, Munich, Germany
| | - Weiping Cao
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - William G. Davis
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Jacqueline M. Katz
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Shivaprakash Gangappa
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Rongtuan Lin
- Department of Medicine, McGill University, Montreal, Canada
| | - Thomas A. Kufer
- Department of Immunology, Institute of Nutritional Medicine, University of Hohenheim, Stuttgart, Germany
| | - Suryaprakash Sambhara
- Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
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Jha S, Pan-Yun Ting J. Holding the inflammatory system in check: NLRs keep it cool. F1000PRIME REPORTS 2015; 7:15. [PMID: 25750733 PMCID: PMC4335796 DOI: 10.12703/p7-15] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Inflammation is a double-edged sword. While short-lived, acute inflammation is essential for the repair and resolution of infection and damage, uncontrolled and unresolved chronic inflammation is central to several diseases, including cancer, autoimmune diseases, allergy, metabolic disease, and cardiovascular disease. This report aims to review the literature regarding several members of the nucleotide-binding domain, leucine-rich repeat-containing receptor (NLR) family of pattern recognition sensors/receptors that serve as checkpoints for inflammation. Understanding the negative regulation of inflammation is highly relevant to the development of therapeutics for inflammatory as well as infectious diseases.
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Affiliation(s)
- Sushmita Jha
- Centre for Biologically Inspired System Science, Indian Institute of Technology JodhpurRajasthan, 342011India
| | - Jenny Pan-Yun Ting
- Lineberger Comprehensive Cancer Center, Department of Microbiology and Immunology, University of North CarolinaChapel Hill, North Carolina 27599-7295USA
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35
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Neerincx A, Jakobshagen K, Utermöhlen O, Büning H, Steimle V, Kufer TA. The N-Terminal Domain of NLRC5 Confers Transcriptional Activity for MHC Class I and II Gene Expression. THE JOURNAL OF IMMUNOLOGY 2014; 193:3090-100. [DOI: 10.4049/jimmunol.1401065] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Barbé F, Douglas T, Saleh M. Advances in Nod-like receptors (NLR) biology. Cytokine Growth Factor Rev 2014; 25:681-97. [PMID: 25070125 DOI: 10.1016/j.cytogfr.2014.07.001] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 07/03/2014] [Indexed: 12/27/2022]
Abstract
The innate immune system is composed of a wide repertoire of conserved pattern recognition receptors (PRRs) able to trigger inflammation and host defense mechanisms in response to endogenous or exogenous pathogenic insults. Among these, nucleotide-binding and oligomerization domain (NOD)-like receptors (NLRs) are intracellular sentinels of cytosolic sanctity capable of orchestrating innate immunity and inflammatory responses following the perception of noxious signals within the cell. In this review, we elaborate on recent advances in the signaling mechanisms of NLRs, operating within inflammasomes or through alternative inflammatory pathways, and discuss the spectrum of their effector functions in innate immunity. We describe the progressive characterization of each NLR with associated controversies and cutting edge discoveries.
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Affiliation(s)
- François Barbé
- Department of Microbiology and Immunology, McGill University, Montréal, Québec H3A 2B4, Canada
| | - Todd Douglas
- Department of Microbiology and Immunology, McGill University, Montréal, Québec H3A 2B4, Canada
| | - Maya Saleh
- Department of Microbiology and Immunology, McGill University, Montréal, Québec H3A 2B4, Canada; Department of Medicine, McGill University, Montréal, Québec H3G 0B1, Canada.
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37
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Neerincx A, Castro W, Guarda G, Kufer TA. NLRC5, at the Heart of Antigen Presentation. Front Immunol 2013; 4:397. [PMID: 24319445 PMCID: PMC3837245 DOI: 10.3389/fimmu.2013.00397] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Accepted: 11/07/2013] [Indexed: 01/25/2023] Open
Abstract
Nucleotide-binding domain and leucine-rich repeat containing receptors (NLRs) are intracellular proteins mainly involved in pathogen recognition, inflammatory responses, and cell death. Until recently, the function of the family member NLR caspase recruitment domain (CARD) containing 5 (NLRC5) has been a matter of debate. It is now clear that NLRC5 acts as a transcriptional regulator of the major-histocompatibility complex class I. In this review we detail the development of our understanding of NLRC5 function, discussing both the accepted and the controversial aspects of NLRC5 activity. We give insight into the molecular mechanisms, and the potential implications, of NLRC5 function in health and disease.
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Affiliation(s)
- Andreas Neerincx
- Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne , Cologne , Germany
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38
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A molecular model of the full-length human NOD-like receptor family CARD domain containing 5 (NLRC5) protein. BMC Bioinformatics 2013; 14:275. [PMID: 24044430 PMCID: PMC3848420 DOI: 10.1186/1471-2105-14-275] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 08/30/2013] [Indexed: 11/25/2022] Open
Abstract
Background Pattern recognition receptors of the immune system have key roles in the regulation of pathways after the recognition of microbial- and danger-associated molecular patterns in vertebrates. Members of NOD-like receptor (NLR) family typically function intracellularly. The NOD-like receptor family CARD domain containing 5 (NLRC5) is the largest member of this family that also contains the largest number of leucine-rich repeats (LRRs). Due to the lack of crystal structures of full-length NLRs, projects have been initiated with the aim to model certain or all members of the family, but systematic studies did not model the full-length NLRC5 due to its unique domain architecture. Our aim was to analyze the LRR sequences of NLRC5 and some NLRC5-related proteins and to build a model for the full-length human NLRC5 by homology modeling. Results LRR sequences of NLRC5 were aligned and were compared with the consensus pattern of ribonuclease inhibitor protein (RI)-like LRR subfamily. Two types of alternating consensus patterns previously identified for RI repeats were also found in NLRC5. A homology model for full-length human NLRC5 was prepared and, besides the closed conformation of monomeric NLRC5, a heptameric platform was also modeled for the opened conformational NLRC5 monomers. Conclusions Identification of consensus patterns of leucine-rich repeat sequences helped to identify LRRs in NLRC5 and to predict their number and position within the protein. In spite of the lack of fully adequate template structures, the presence of an untypical CARD domain and unusually high number of LRRs in NLRC5, we were able to construct a homology model for both the monomeric and homo-heptameric full-length human NLRC5 protein.
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Expression regulation and function of NLRC5. Protein Cell 2013; 4:168-75. [PMID: 23483478 DOI: 10.1007/s13238-012-2109-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Accepted: 12/10/2012] [Indexed: 02/01/2023] Open
Abstract
The NOD like receptors (NLRs), a class of intracellular receptors that respond to pathogen attack or cellular stress, have gained increasing attention. NLRC5, the largest member of the NLR protein family, has recently been identified as a critical regulator of immune responses. While NLRC5 is constitutively and widely expressed, it can be dramatically induced by interferons during pathogen infections. Both in vitro and in vivo studies have demonstrated that NLRC5 is a specific and master regulator of major mistocompatibility complex (MHC) class I genes as well as related genes involved in MHC class I antigen presentation. The expression of MHC class I genes is regulated by NLRC5 in coordination with the RFX components through an enhanceosome-dependent manner. And the involvement of NLRC5 in MHC class I mediated CD8+ T cell activation, proliferation and cytotoxicity is proved to be critical for host defense against intracellular bacterial infections. Nevertheless, the role of NLRC5 in innate immunity remains to be further explored. Here, we review the research advances on the structure, expression regulation and function of NLRC5.
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Kobayashi KS, van den Elsen PJ. NLRC5: a key regulator of MHC class I-dependent immune responses. Nat Rev Immunol 2013; 12:813-20. [PMID: 23175229 DOI: 10.1038/nri3339] [Citation(s) in RCA: 256] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The expression of MHC class I molecules is crucial for the initiation and regulation of adaptive immune responses against pathogens. NOD-, LRR- and CARD-containing 5 (NLRC5) was recently identified as a specific transactivator of MHC class I genes (CITA). NLRC5 and the master regulator for MHC class II genes, class II transactivator (CIITA), interact with similar MHC promoter-bound factors. Here, we provide a broad overview of the molecular mechanisms behind MHC class I transcription and the role of the class I transactivator NLRC5 in MHC class I-dependent immune responses.
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Affiliation(s)
- Koichi S Kobayashi
- Department of Microbial and Molecular Pathogenesis, College of Medicine, Texas A&M Health Science Center, College Station, Texas 77843, USA.
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Wirthmueller L, Roth C, Banfield MJ, Wiermer M. Hop-on hop-off: importin-α-guided tours to the nucleus in innate immune signaling. FRONTIERS IN PLANT SCIENCE 2013; 4:149. [PMID: 23734157 PMCID: PMC3659281 DOI: 10.3389/fpls.2013.00149] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Accepted: 05/02/2013] [Indexed: 05/19/2023]
Abstract
Nuclear translocation of immune regulatory proteins and signal transducers is an essential process in animal and plant defense signaling against pathogenic microbes. Import of proteins containing a nuclear localization signal (NLS) into the nucleus is mediated by nuclear transport receptors termed importins, typically dimers of a cargo-binding α-subunit and a β-subunit that mediates translocation through the nuclear pore complex. Here, we review recent reports of importin-α cargo specificity and mutant phenotypes in plant- and animal-microbe interactions. Using homology modeling of the NLS-binding cleft of nine predicted Arabidopsis α-importins and analyses of their gene expression patterns, we discuss functional redundancy and specialization within this transport receptor family. In addition, we consider how pathogen effector proteins that promote infection by manipulating host cell nuclear processes might compete with endogenous cargo proteins for nuclear uptake.
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Affiliation(s)
- Lennart Wirthmueller
- Department of Biological Chemistry, John Innes Centre, Norwich Research ParkNorwich, UK
- *Correspondence: Lennart Wirthmueller, Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK. e-mail: ; Marcel Wiermer, Albrecht-von-Haller-Institute for Plant Sciences, Department of Plant Cell Biology, Georg-August-University Göttingen, Julia-Lermontowa-Weg 3, 37077 Göttingen, Germany. e-mail:
| | - Charlotte Roth
- Albrecht-von-Haller-Institute for Plant Sciences, Department of Plant Cell Biology, Georg-August-University GöttingenGöttingen, Germany
| | - Mark J. Banfield
- Department of Biological Chemistry, John Innes Centre, Norwich Research ParkNorwich, UK
| | - Marcel Wiermer
- Albrecht-von-Haller-Institute for Plant Sciences, Department of Plant Cell Biology, Georg-August-University GöttingenGöttingen, Germany
- *Correspondence: Lennart Wirthmueller, Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK. e-mail: ; Marcel Wiermer, Albrecht-von-Haller-Institute for Plant Sciences, Department of Plant Cell Biology, Georg-August-University Göttingen, Julia-Lermontowa-Weg 3, 37077 Göttingen, Germany. e-mail:
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Biswas A, Meissner TB, Kawai T, Kobayashi KS. Cutting edge: impaired MHC class I expression in mice deficient for Nlrc5/class I transactivator. THE JOURNAL OF IMMUNOLOGY 2012; 189:516-20. [PMID: 22711889 DOI: 10.4049/jimmunol.1200064] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
MHC class I and class II are crucial for the adaptive immune system. Although regulation of MHC class II expression by CIITA has long been recognized, the mechanism of MHC class I transactivation has been largely unknown until the recent discovery of NLRC5/class I transactivator. In this study, we show using Nlrc5-deficient mice that NLRC5 is required for both constitutive and inducible MHC class I expression. Loss of Nlrc5 resulted in severe reduction in the expression of MHC class I and related genes such as β(2)-microglobulin, Tap1, or Lmp2, but did not affect MHC class II levels. IFN-γ stimulation could not overcome the impaired MHC class I expression in Nlrc5-deficient cells. Upon infection with Listeria monocyogenes, Nlrc5-deficient mice displayed impaired CD8(+) T cell activation, accompanied with increased bacterial loads. These findings illustrate critical roles of NLRC5/class I transactivator in MHC class I gene regulation and host defense by CD8(+) T cell responses.
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Affiliation(s)
- Amlan Biswas
- Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA 02215, USA
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Robbins GR, Truax AD, Davis BK, Zhang L, Brickey WJ, Ting JPY. Regulation of class I major histocompatibility complex (MHC) by nucleotide-binding domain, leucine-rich repeat-containing (NLR) proteins. J Biol Chem 2012; 287:24294-303. [PMID: 22645137 DOI: 10.1074/jbc.m112.364604] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Most of the nucleotide-binding domain, leucine-rich repeat (NLR) proteins regulate responses to microbial and damage-associated products. Class II transactivator (CIITA) has a distinct function as the master regulator of class II major histocompatibility complex (MHC-II) transcription. Recently, human NLRC5 was found to regulate MHC-I in cell lines; however, a host of conflicting positive and negative functions has been attributed to this protein. To address the function of NLRC5 in a physiologic setting, we generated an Nlrc5(-/-) strain that contains a deletion in the exon that encodes the nucleotide-binding domain. We have not detected a role for this protein in cytokine induction by pathogen-associated molecular patterns and viruses. However, Nlrc5(-/-) cells showed a dramatic decrease of classical (H-2K) and nonclassical (Tla) MHC-I expression by T/B lymphocytes, natural killer (NK) cells, and myeloid-monocytic lineages. As a comparison, CIITA did not affect mouse MHC-I expression. Nlrc5(-/-) splenocytes and bone marrow-derived macrophages were able to up-regulate MHC-I in response to IFN-γ; however, the absolute levels of MHC-I expression were significantly lower than WT controls. Chromatin immunoprecipitation of IFN-γ-treated cells indicates that Nlrc5 reduced the silencing H3K27me3 histone modification, but did not affect the activating AcH3 modification on a MHC-I promoter. In summary, we conclude that Nlrc5 is important in the regulation of MHC-I expression by reducing H3K27me3 on MHC-I promoter and joins CIITA as an NLR subfamily that controls MHC gene transcription.
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Affiliation(s)
- Gregory R Robbins
- Department of Microbiology and Immunology, Lineberger Comprehensive Cancer Center, the Institute of Inflammatory Diseases and Center of Translational Immunology, University of North Carolina, Chapel Hill, North Carolina 27599-7295, USA
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NLRC5 regulates MHC class I antigen presentation in host defense against intracellular pathogens. Cell Res 2012; 22:836-47. [PMID: 22491475 DOI: 10.1038/cr.2012.56] [Citation(s) in RCA: 114] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
NOD-like receptors (NLRs) are a family of intracellular proteins that play critical roles in innate immunity against microbial infection. NLRC5, the largest member of the NLR family, has recently attracted much attention. However, in vitro studies have reported inconsistent results about the roles of NLRC5 in host defense and in regulating immune signaling pathways. The in vivo function of NLRC5 remains unknown. Here, we report that NLRC5 is a critical regulator of host defense against intracellular pathogens in vivo. NLRC5 was specifically required for the expression of genes involved in MHC class I antigen presentation. NLRC5-deficient mice showed a profound defect in the expression of MHC class I genes and a concomitant failure to activate L. monocytogenes-specific CD8(+) T cell responses, including activation, proliferation and cytotoxicity, and the mutant mice were more susceptible to the pathogen infection. NLRP3-mediated inflammasome activation was also partially impaired in NLRC5-deficient mice. However, NLRC5 was dispensable for pathogen-induced expression of NF-κB-dependent pro-inflammatory genes as well as type I interferon genes. Thus, NLRC5 critically regulates MHC class I antigen presentation to control intracellular pathogen infection.
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Meissner TB, Liu YJ, Lee KH, Li A, Biswas A, van Eggermond MCJA, van den Elsen PJ, Kobayashi KS. NLRC5 cooperates with the RFX transcription factor complex to induce MHC class I gene expression. THE JOURNAL OF IMMUNOLOGY 2012; 188:4951-8. [PMID: 22490869 DOI: 10.4049/jimmunol.1103160] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Tight regulation of MHC class I gene expression is critical for CD8 T cell activation and host adaptive-immune responses. The promoters of MHC class I genes contain a well-conserved core module, the W/S-X-Y motif, which assembles a nucleoprotein complex termed MHC enhanceosome. A member of the nucleotide-binding domain, leucine-rich repeat (NLR) protein family, NLRC5, is a newly identified transcriptional regulator of MHC class I genes. NLRC5 associates with and transactivates the proximal promoters of MHC class I genes, although the molecular mechanism of transactivation has not been understood. In this article, we show that NLRC5-mediated MHC class I gene induction requires the W/S and X1, X2 cis-regulatory elements. The transcription factors RFX5, RFXAP, and RFXANK/B, which compose the RFX protein complex and associate with the X1 box, cooperate with NLRC5 for MHC class I expression. Coimmunoprecipitation experiments revealed that NLRC5 specifically interacts with the RFX subunit RFXANK/B via its ankyrin repeats. In addition, we show that NLRC5 can cooperate with ATF1 and the transcriptional coactivators CBP/p300 and general control nonderepressible 5, which display histone acetyltransferase activity. Taken together, our data suggest that NLRC5 participates in an MHC class I-specific enhanceosome, which assembles on the conserved W/S-X-Y core module of the MHC class I proximal promoters, including the RFX factor components and CREB/ATF1 family transcription factors, to promote MHC class I gene expression.
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Affiliation(s)
- Torsten B Meissner
- Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA 02215, USA
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Kobayashi KS. NLRC5/CITA: a novel regulator of class I major histocompatibility complex genes. ACTA ACUST UNITED AC 2012; 1. [PMID: 24490178 DOI: 10.4172/2324-853x.1000e102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Koichi S Kobayashi
- Department of Cancer Immunology & AIDS, Dana-Farber Cancer Institute, Boston, MA 02215
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