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Wu J, Fang S, Feng P, Cai C, Zhang L, Yang L. Changes in expression levels of Nod-like receptors in the spleen of ewes. Anim Reprod 2023; 20:e20220093. [PMID: 37228386 PMCID: PMC10205055 DOI: 10.1590/1984-3143-ar2022-0093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 03/07/2023] [Indexed: 05/27/2023] Open
Abstract
Nucleotide-binding oligomerization domain receptors (NOD-like receptors, NLRs) have critical effects on interfaces of the immune and reproductive systems, and the spleen plays a key role in both innate and adaptive immune functions. It is hypothesized that NLR family participates in maternal splenic immune regulation during early pregnancy in sheep. In this study, maternal spleens were collected on day 16 of the estrous cycle, and days 13, 16 and 25 of gestation (n = 6 for each group) in ewes. Expression of NLR family, including NOD1, NOD2, class II transactivator (CIITA), NLR family apoptosis inhibitory protein (NAIP), nucleotide-binding oligomerization domain, Leucine rich repeat and Pyrin domain containing 1 (NLRP1), NLRP3 and NLRP7, was analyzed using quantitative real-time PCR, Western blot and immunohistochemistry analysis. The results revealed that expression levels of NOD1, NOD2, CIITA and NLRP3 were downregulated at days 13 and 16 of pregnancy, but expression of NLRP3 was increased at day 25 of pregnancy. In addition, expression values of NAIP and NLRP7 mRNA and proteins were improved at days 16 and 25 of pregnancy, and NLRP1 was peaked at days 13 and 16 of pregnancy in the maternal spleen. Furthermore, NOD2 and NLRP7 proteins were limited to the capsule, trabeculae and splenic cords. In summary, early pregnancy changes expression of NLR family in the maternal spleen, which may be related with the maternal splenic immunomodulation during early pregnancy in sheep.
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Affiliation(s)
- Jiaxuan Wu
- Department of Animal Science, School of Life Sciences and Food Engineering, Hebei University of Engineering, Handan, China
| | - Shengya Fang
- Department of Animal Science, School of Life Sciences and Food Engineering, Hebei University of Engineering, Handan, China
| | - Pengfei Feng
- Department of Animal Science, School of Life Sciences and Food Engineering, Hebei University of Engineering, Handan, China
| | - Chunjiang Cai
- Department of Animal Science, School of Life Sciences and Food Engineering, Hebei University of Engineering, Handan, China
| | - Leying Zhang
- Department of Animal Science, School of Life Sciences and Food Engineering, Hebei University of Engineering, Handan, China
| | - Ling Yang
- Department of Animal Science, School of Life Sciences and Food Engineering, Hebei University of Engineering, Handan, China
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2
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Khare S, Devi S, Radian AD, Dorfleutner A, Stehlik C. Methods to Measure NLR Oligomerization I: Size Exclusion Chromatography, Co-immunoprecipitation, and Cross-Linking. Methods Mol Biol 2023; 2696:55-71. [PMID: 37578715 DOI: 10.1007/978-1-0716-3350-2_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
Protein oligomerization is a common principle of regulating cellular responses. Oligomerization of NLRs is essential for the formation of NLR signaling platforms and can be detected by several biochemical techniques. Some of these biochemical methods can be combined with functional assays, such as caspase-1 activity assay. Size exclusion chromatography (SEC) allows separation of native protein lysates into different sized complexes by FPLC for follow-up analysis. Using co-immunoprecipitation (co-IP), combined with SEC or on its own, enables subsequent antibody-based purification of NLR complexes and associated proteins, which can then be analyzed by immunoblot and/or subjected to functional caspase-1 activity assay. Native gel electrophoresis also allows detection of the NLR oligomerization state by immunoblot. Chemical cross-linking covalently joins two or more molecules, thus capturing the oligomeric state with high sensitivity and stability. ASC oligomerization has been successfully used as readout for NLR/ALR inflammasome activation in response to various PAMPs and DAMPs in human and mouse macrophages and THP-1 cells. Here, we provide a detailed description of the methods used for NLRP7 oligomerization in response to infection with Staphylococcus aureus (S. aureus) in primary human macrophages, co-immunoprecipitation, and immunoblot analysis of NLRP7 and NLRP3 inflammasome complexes as well as caspase-1 activity assays. Also, ASC oligomerization is shown in response to dsDNA, LPS/ATP, and LPS/nigericin in mouse bone marrow-derived macrophages (BMDMs) and/or THP-1 cells or human primary macrophages.
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Affiliation(s)
- Sonal Khare
- Department of Academic Pathology, Department of Biomedical Sciences and Samuel Oschin Comprehensive Cancer Institute, Cedars Sinai Medical Center, Los Angeles, CA, USA
| | - Savita Devi
- Department of Academic Pathology, Department of Biomedical Sciences and Samuel Oschin Comprehensive Cancer Institute, Cedars Sinai Medical Center, Los Angeles, CA, USA
| | - Alexander D Radian
- Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Andrea Dorfleutner
- Department of Academic Pathology, Department of Biomedical Sciences and Samuel Oschin Comprehensive Cancer Institute, Cedars Sinai Medical Center, Los Angeles, CA, USA
| | - Christian Stehlik
- Department of Academic Pathology, Department of Biomedical Sciences and Samuel Oschin Comprehensive Cancer Institute, Cedars Sinai Medical Center, Los Angeles, CA, USA.
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3
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Duan Y, Wang J, Cai J, Kelley N, He Y. The leucine-rich repeat (LRR) domain of NLRP3 is required for NLRP3 inflammasome activation in macrophages. J Biol Chem 2022; 298:102717. [PMID: 36403854 PMCID: PMC9763864 DOI: 10.1016/j.jbc.2022.102717] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 10/25/2022] [Accepted: 11/04/2022] [Indexed: 11/19/2022] Open
Abstract
The NLRP3 inflammasome is a critical component of innate immunity that defends the host from microbial infections. However, its aberrant activation contributes to the pathogenesis of several inflammatory diseases. Activation of the NLRP3 inflammasome induces the secretion of proinflammatory cytokines IL-1β and IL-18 and pyroptotic cell death. NLRP3 contains a leucine-rich repeat (LRR) domain at its C terminus. Although posttranslational modifications in this LRR domain have been shown to regulate NLRP3 inflammasome activation, the role of the entire LRR domain in NLRP3 inflammasome activation remains controversial. Here, we generated mouse macrophages that express an endogenous NLRP3 mutant lacking the LRR domain. Deletion of the LRR domain diminished NLRP3 inflammasome activation in macrophages. Furthermore, using NLRP3-deficient macrophages that are reconstituted with NLRP3 mutants lacking the LRR domain, we found that deletion of the LRR domain inhibited NLRP3 inflammasome activation. Mechanistically, deletion of the LRR domain inhibited NLRP3 self-association, oligomerization, and interaction with the essential regulator NEK7. Our results demonstrate a critical role for the LRR domain in NLRP3 inflammasome activation.
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Affiliation(s)
- Yanhui Duan
- Department of Biochemistry, Microbiology, and Immunology, Wayne State University, Detroit, Michigan, USA
| | - Jihong Wang
- Department of Biochemistry, Microbiology, and Immunology, Wayne State University, Detroit, Michigan, USA
| | - Juan Cai
- Department of Biochemistry, Microbiology, and Immunology, Wayne State University, Detroit, Michigan, USA
| | - Nathan Kelley
- Department of Biochemistry, Microbiology, and Immunology, Wayne State University, Detroit, Michigan, USA
| | - Yuan He
- Department of Biochemistry, Microbiology, and Immunology, Wayne State University, Detroit, Michigan, USA.
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4
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Lee EJ, Napier RJ, Vance EE, Lashley SJ, Truax AD, Ting JP, Rosenzweig HL. The innate immune receptor Nlrp12 suppresses autoimmunity to the retina. J Neuroinflammation 2022; 19:69. [PMID: 35313917 PMCID: PMC8939070 DOI: 10.1186/s12974-022-02425-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 02/27/2022] [Indexed: 12/23/2022] Open
Abstract
Background Nod-like receptors (NLRs) are critical to innate immune activation and induction of adaptive T cell responses. Yet, their role in autoinflammatory diseases of the central nervous system (CNS) remains incompletely defined. The NLR, Nlrp12, has been reported to both inhibit and promote neuroinflammation in an animal model of multiple sclerosis (experimental autoimmune encephalomyelitis, EAE), where its T cell-specific role has been investigated. Uveitis resulting from autoimmunity of the neuroretina, an extension of the CNS, involves a breach in immune privilege and entry of T cells into the eye. Here, we examined the contribution of Nlrp12 in a T cell-mediated model of uveitis, experimental autoimmune uveitis (EAU). Methods Mice were immunized with interphotoreceptor retinoid-binding protein peptide 1–20 (IRBP1–20) emulsified in Complete Freund’s adjuvant, CFA. Uveitis was evaluated by clinical and histopathological scoring, and comparisons were made in WT vs. Nlrp12−/− mice, lymphopenic Rag1−/− mice reconstituted with WT vs. Nlrp12−/− CD4+ T cells, or among bone marrow (BM) chimeric mice. Antigen-specific Th-effector responses were evaluated by ELISA and intracellular cytokine staining. Cellular composition of uveitic eyes from WT or Nlrp12−/− mice was compared using flow cytometry. Expression of Nlrp12 and of cytokines/chemokines within the neuroretina was evaluated by immunoblotting and quantitative PCR. Results Nlrp12−/− mice developed exacerbated uveitis characterized by extensive vasculitis, chorioretinal infiltrates and photoreceptor damage. Nlrp12 was dispensable for T cell priming and differentiation of peripheral Th1 or Th17 cells, and uveitis in immunodeficient mice reconstituted with either Nlrp12−/− or WT T cells was similar. Collectively, this ruled out T cells as the source of Nlrp12-mediated protection to EAU. Uveitic Nlrp12−/− eyes had more pronounced myeloid cell accumulation than uveitic WT eyes. Transplantation of Nlrp12−/− BM resulted in increased susceptibility to EAU regardless of host genotype, but interestingly, a non-hematopoietic origin for Nlrp12 function was also observed. Indeed, Nlrp12 was found to be constitutively expressed in the neuroretina, where it suppressed chemokine/cytokine induction. Conclusions Our data identify a combinatorial role for Nlrp12 in dampening autoimmunity of the neuroretina. These findings could provide a pathway for development of therapies for uveitis and potentially other autoinflammatory/autoimmune diseases of the CNS. Supplementary Information The online version contains supplementary material available at 10.1186/s12974-022-02425-x.
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Affiliation(s)
- Ellen J Lee
- VA Portland Health Care System, Portland, OR, USA.,Dept. of Molecular Microbiology & Immunology, Oregon Health & Science University, Portland, OR, USA
| | - Ruth J Napier
- VA Portland Health Care System, Portland, OR, USA.,Dept. of Molecular Microbiology & Immunology, Oregon Health & Science University, Portland, OR, USA
| | - Emily E Vance
- VA Portland Health Care System, Portland, OR, USA.,Dept. of Molecular Microbiology & Immunology, Oregon Health & Science University, Portland, OR, USA
| | | | - Agnieszka D Truax
- Lineberger Comprehensive Cancer Center, University North Carolina, Chapel Hill, NC, USA
| | - Jenny P Ting
- Lineberger Comprehensive Cancer Center, Depts. Genetics and Microbiology-Immunology, University of North Carolina, Chapel Hill, NC, USA
| | - Holly L Rosenzweig
- VA Portland Health Care System, Portland, OR, USA. .,Dept. of Molecular Microbiology & Immunology, Oregon Health & Science University, Portland, OR, USA. .,Oregon Health & Science University, VA Portland Health Care System, 3710 SW US Veterans Hospital Rd., Bldg 103, Room E-222, Mail stop: VA R&D-14, Portland, OR, 97239, USA.
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5
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Hafez HM, Ibrahim MA, Yehia Abdelzaher W, Gad AA, Mohammed Naguib Abdel Hafez S, Abdel-Gaber SA. Protective effect of mirtazapine against acetic acid-induced ulcerative colitis in rats: Role of NLRP3 inflammasome pathway. Int Immunopharmacol 2021; 101:108174. [PMID: 34601335 DOI: 10.1016/j.intimp.2021.108174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 09/11/2021] [Accepted: 09/16/2021] [Indexed: 01/06/2023]
Abstract
AIMS Ulcerative colitis (UC) is an inflammatory bowel disease (IBD) that causes long-lasting inflammation on the innermost lining of the colon and rectum. Mirtazapine (MRT) is a well-known antidepressant that was proven to have anti-inflammatory activity; however, to date, its role has not been investigated in UC. The current study aimed to investigate the role and mechanism of MRT in UC. MAIN METHOD Acetic acid (AA) was used for UC induction, and sulfasalazine (SLZ) was used as a positive control. Rats were divided into five equal groups; as follows; normal control, AA, SLZ (received SLZ in a dose of 250 mg/kg for 14 days), MRT10 (received MRT in a dose of 10 mg/kg/day for 14 days), and MRT30 (received MRT in a dose of 30 mg/kg/day for 14 days) groups. Macroscopic and microscopic examinations together with oxidative stress parameters evaluation were done. NOD-like receptors-3 (NLRP3), caspase-1, TNF-α, and nuclear factor kappa B (NF-κB) expression together with interleukin (IL)-1β and IL-18 levels were examined. KEY FINDING MRT, in a dose-dependent manner, prevented the macroscopic and microscopic colonic damage and corrected the oxidative stress induced by AA. Moreover, MRT decreased the colonic tissue NLRP3 inflammasome, caspase-1, NF-κB, TNF-α expressions, IL-1β, and IL-18 levels that were elevated in colonic tissue by the AA. SIGNIFICANCE MRT has a dose-dependent protective effect against UC that was mediated mainly by its anti-inflammatory activity with modulation of NLRP3/caspase-1 inflammatory pathway.
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6
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Queiroga TBD, Pereira NDS, da Silva DD, Andrade CDM, de Araújo Júnior RF, Brito CRDN, Galvão LMDC, da Câmara ACJ, Nascimento MSL, Guedes PMM. Virulence of Trypanosoma cruzi Strains Is Related to the Differential Expression of Innate Immune Receptors in the Heart. Front Cell Infect Microbiol 2021; 11:696719. [PMID: 34336720 PMCID: PMC8321543 DOI: 10.3389/fcimb.2021.696719] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Accepted: 06/25/2021] [Indexed: 11/13/2022] Open
Abstract
Resistance or susceptibility to T. cruzi infection is dependent on the host immunological profile. Innate immune receptors, such as Toll-like receptors (TLRs/TLR2, TLR4, TLR7, and TLR9) and Nod-like receptors (NLRs/NOD1 and NLRP3 inflammasome) are involved with the resistance against acute experimental T. cruzi infection. Here, we evaluated the impact of T. cruzi virulence on the expression of innate immune receptors and its products in mice. For that, we used six T. cruzi strains/isolates that showed low (AM64/TcIV and 3253/Tc-V), medium (PL1.10.14/TcIII and CL/TcVI), or high (Colombian/Tc-I and Y/TcII) virulence and pathogenicity to the vertebrate host and belonging to the six discrete typing units (DTUs)—TcI to TcVI. Parasitemia, mortality, and myocarditis were evaluated and correlated to the expression of TLRs, NLRs, adapter molecules, cytokines, and iNOS in myocardium by real time PCR. Cytokines (IL-1β, IL-12, TNF-α, and IFN-γ) were quantified in sera 15 days after infection. Our data indicate that high virulent strains of T. cruzi, which generate high parasitemia, severe myocarditis, and 100% mortality in infected mice, inhibit the expression of TLR2, TLR4, TLR9, TRIF, and Myd88 transcripts, leading to a low IL-12 production, when compared to medium and low virulent T. cruzi strains. On the other hand, the high virulent T. cruzi strains induce the upregulation of NLRP3, caspase-1, IL-1β, TNF-α, and iNOS mRNA in heart muscle, compared to low and medium virulent strains, which may contribute to myocarditis and death. Moreover, high virulent strains induce higher levels of IL-1β and TNF-α in sera compared to less virulent parasites. Altogether the data indicate that differential TLR and NLR expression in heart muscle is correlated with virulence and pathogenicity of T cruzi strains. A better knowledge of the immunological mechanisms involved in resistance to T. cruzi infection is important to understand the natural history of Chagas disease, can lead to identification of immunological markers and/or to serve as a basis for alternative therapies.
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Affiliation(s)
| | - Nathalie de Sena Pereira
- Graduate Program Health and Biological Sciences, Federal University of Vale do São Francisco, Petrolina, Brazil
| | - Denis Dantas da Silva
- Graduate Program Parasitary Biology, Federal University of Rio Grande do Norte, Natal, Brazil
| | | | - Raimundo Fernandes de Araújo Júnior
- Laboratory of Investigation of the Inflammation and Cancer (LAICI)/Department of Morphology, Federal University of Rio Grande do Norte, Natal, Brazil
| | | | | | | | | | - Paulo Marcos Matta Guedes
- Department of Microbiology and Parasitology, Federal University of Rio Grande do Norte, Natal, Brazil
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7
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Devi S, Stehlik C, Dorfleutner A. An Update on CARD Only Proteins (COPs) and PYD Only Proteins (POPs) as Inflammasome Regulators. Int J Mol Sci 2020; 21:ijms21186901. [PMID: 32962268 PMCID: PMC7555848 DOI: 10.3390/ijms21186901] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 09/17/2020] [Accepted: 09/17/2020] [Indexed: 12/18/2022] Open
Abstract
Inflammasomes are protein scaffolds required for the activation of caspase-1 and the subsequent release of interleukin (IL)-1β, IL-18, and danger signals, as well as the induction of pyroptotic cell death to restore homeostasis following infection and sterile tissue damage. However, excessive inflammasome activation also causes detrimental inflammatory disease. Therefore, extensive control mechanisms are necessary to prevent improper inflammasome responses and inflammatory disease. Inflammasomes are assembled by sequential nucleated polymerization of Pyrin domain (PYD) and caspase recruitment domain (CARD)-containing inflammasome components. Once polymerization is nucleated, this process proceeds in a self-perpetuating manner and represents a point of no return. Therefore, regulation of this key step is crucial for a controlled inflammasome response. Here, we provide an update on two single domain protein families containing either a PYD or a CARD, the PYD-only proteins (POPs) and CARD-only proteins (COPs), respectively. Their structure allows them to occupy and block access to key protein–protein interaction domains necessary for inflammasome assembly, thereby regulating the threshold of these nucleated polymerization events, and consequently, the inflammatory host response.
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Affiliation(s)
- Savita Devi
- Department of Pathology and Laboratory Medicine, Cedars Sinai, Los Angeles, CA 90048, USA;
| | - Christian Stehlik
- Department of Pathology and Laboratory Medicine, Cedars Sinai, Los Angeles, CA 90048, USA;
- Department of Biomedical Sciences, and Samuel Oschin Comprehensive Cancer Institute, Cedars Sinai, Los Angeles, CA 90048, USA
- Correspondence: (C.S.); (A.D.); Tel.: +1-424-315-2670 (C.S.); +1-424-315-2397 (A.D.)
| | - Andrea Dorfleutner
- Department of Pathology and Laboratory Medicine, Cedars Sinai, Los Angeles, CA 90048, USA;
- Department of Biomedical Sciences, Cedars Sinai, Los Angeles, CA 90048, USA
- Correspondence: (C.S.); (A.D.); Tel.: +1-424-315-2670 (C.S.); +1-424-315-2397 (A.D.)
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8
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Xiao G, Zhuang W, Wang T, Lian G, Luo L, Ye C, Wang H, Xie L. Transcriptomic analysis identifies Toll-like and Nod-like pathways and necroptosis in pulmonary arterial hypertension. J Cell Mol Med 2020; 24:11409-11421. [PMID: 32860486 PMCID: PMC7576255 DOI: 10.1111/jcmm.15745] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/16/2020] [Accepted: 07/30/2020] [Indexed: 12/11/2022] Open
Abstract
Inflammation and immunity play a causal role in the pathogenesis of pulmonary vascular remodelling and pulmonary arterial hypertension (PAH). However, the pathways and mechanisms by which inflammation and immunity contribute to pulmonary vascular remodelling remain unknown. RNA sequencing was used to analyse the transcriptome in control and rats injected with monocrotaline (MCT) for various weeks. Using the transcriptional profiling of MCT‐induced PAH coupled with bioinformatics analysis, we clustered the differentially expressed genes (DEGs) and chose the increased expression patterns associated with inflammatory and immune response. We found the enrichment of Toll‐like receptor (TLR) and Nod‐like receptor (NLR) pathways and identified NF‐κB‐mediated inflammatory and immune profiling in MCT‐induced PAH. Pathway‐based data integration and visualization showed the dysregulated TLR and NLR pathways, including increased expression of TLR2 and NLRP3, and their downstream molecules. Further analysis revealed that the activation of TLR and NLR pathways was associated with up‐regulation of damage‐associated molecular patterns (DAMPs) and RIPK3‐mediated necroptosis was involved in the generation of DAMPs in MCT‐induced PAH. Collectively, we identify RIPK3‐mediated necroptosis and its triggered TLR and NLR pathways in the progression of pulmonary vascular remodelling, thus providing novel insights into the mechanisms underlying inflammation and immunity in the pathogenesis of PAH.
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Affiliation(s)
- Genfa Xiao
- Department of Geriatrics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian, People's Republic of China.,Department of General Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou, People's Republic of China.,Fujian Hypertension Research Institute, The First Affiliated Hospital of Fujian Medical University, People's Republic of China
| | - Wei Zhuang
- Fujian Hypertension Research Institute, The First Affiliated Hospital of Fujian Medical University, People's Republic of China
| | - Tingjun Wang
- Department of Geriatrics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian, People's Republic of China.,Department of General Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou, People's Republic of China.,Fujian Hypertension Research Institute, The First Affiliated Hospital of Fujian Medical University, People's Republic of China
| | - Guili Lian
- Fujian Hypertension Research Institute, The First Affiliated Hospital of Fujian Medical University, People's Republic of China
| | - Li Luo
- Department of Geriatrics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian, People's Republic of China.,Department of General Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou, People's Republic of China.,Fujian Hypertension Research Institute, The First Affiliated Hospital of Fujian Medical University, People's Republic of China
| | - Chaoyi Ye
- Fujian Hypertension Research Institute, The First Affiliated Hospital of Fujian Medical University, People's Republic of China
| | - Huajun Wang
- Fujian Hypertension Research Institute, The First Affiliated Hospital of Fujian Medical University, People's Republic of China
| | - Liangdi Xie
- Department of Geriatrics, The First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian, People's Republic of China.,Department of General Medicine, The First Affiliated Hospital of Fujian Medical University, Fuzhou, People's Republic of China.,Fujian Hypertension Research Institute, The First Affiliated Hospital of Fujian Medical University, People's Republic of China
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9
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Trindade BC, Chen GY. NOD1 and NOD2 in inflammatory and infectious diseases. Immunol Rev 2020; 297:139-161. [PMID: 32677123 DOI: 10.1111/imr.12902] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/23/2020] [Accepted: 06/24/2020] [Indexed: 12/12/2022]
Abstract
It has been long recognized that NOD1 and NOD2 are critical players in the host immune response, primarily by their sensing bacterial peptidoglycan-conserved motifs. Significant advances have been made from efforts that characterize their upstream activators, assembly of signaling complexes, and activation of downstream signaling pathways. Disruption in NOD1 and NOD2 signaling has also been associated with impaired host defense and resistance to the development of inflammatory diseases. In this review, we will describe how NOD1 and NOD2 sense microbes and cellular stress to regulate host responses that can affect disease pathogenesis and outcomes.
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Affiliation(s)
- Bruno C Trindade
- Division of Hematology and Oncology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Grace Y Chen
- Division of Hematology and Oncology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
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10
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Tupik JD, Nagai-Singer MA, Allen IC. To protect or adversely affect? The dichotomous role of the NLRP1 inflammasome in human disease. Mol Aspects Med 2020; 76:100858. [PMID: 32359693 DOI: 10.1016/j.mam.2020.100858] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 03/23/2020] [Accepted: 04/11/2020] [Indexed: 01/06/2023]
Abstract
NLRP1 is an inflammasome forming pattern recognition receptor (PRR). When activated by pathogen- and damage- associated molecular patterns (PAMPS/DAMPS), NLRP1 inflammasome formation leads to inflammation through the production of proinflammatory cytokines IL-18 and IL-1β. As with other inflammasome forming NLR family members, NLRP1 also regulates cell death processes, termed pyroptosis. The domain structure of NLRP1 differs between mice and humans, making it possible for the function of the inflammasome to differ between species and adds complexity to the study of this NLR family member. In humans, mutations in both coding and non-coding regions of the NLRP1 gene are linked to a variety of diseases. Likewise, interruption of NLRP1 inhibitors or changes in the prevalence of NLRP1 activators can also impact disease pathobiology. Adding to its complexity, the NLRP1 inflammasome plays a dichotomous role in human diseases, functioning to either attenuate or augment miscellaneous biological processes in a tissue specific manner. For example, NLRP1 plays a protective role in the gastrointestinal tract by modulating the microbiome composition; however, it augments neurological disorders, cardio-pulmonary diseases, and cancer through promoting inflammation. Thus, it is critical that the role of NLRP1 in each of these disease processes be robustly defined. In this review, we summarize the current research landscape to provide a better understanding of the mechanisms associated with NLRP1 function and dysfunction in human disease pathobiology. We propose that a better understanding of these mechanisms will ultimately result in improved insight into immune system dysfunction and therapeutic strategies targeting inflammasome function in multiple human diseases.
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Affiliation(s)
- Juselyn D Tupik
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA, USA
| | - Margaret A Nagai-Singer
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA, USA
| | - Irving C Allen
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA, USA; Department of Basic Science Education, Virginia Tech Carilion School of Medicine, Roanoke, VA, USA.
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11
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Ringel-Scaia VM, Qin Y, Thomas CA, Huie KE, McDaniel DK, Eden K, Wade PA, Allen IC. Maternal Influence and Murine Housing Confound Impact of NLRP1 Inflammasome on Microbiome Composition. J Innate Immun 2019; 11:416-431. [PMID: 30759441 DOI: 10.1159/000495850] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 11/21/2018] [Indexed: 12/17/2022] Open
Abstract
The NLRP1 inflammasome attenuates inflammatory bowel disease (IBD) progression and colitis-associated tumorigenesis. A possible mechanism postulates that the lack of the NLRP1 inflammasome creates permissive niches in the gut for pathogenic bacteria to flourish, causing dysbiosis and increased IBD susceptibility. To evaluate this hypothesis, we characterized the gut microbiome of wild-type, Nlrp1b-/-, and Asc-/- mice under naïve conditions by sequencing the V3 region of the 16s rRNA gene. For both genetically modified mouse lines, the microbiome composition reflected overrepresentation of bacteria associated with dysbiosis relative to wild-type animals. Measurement of short- and medium-chain fatty acids by mass spectrometry further revealed significant differences between genotypes. However, prior to concluding that the NLRP1 inflammasome plays a role in regulating the composition of the microbiome, we evaluated two additional strategies for cohousing wild-type and Nlrp1b-/- mice: breeding homozygous parents and cohousing at weaning, and breeding from heterozygous parents and cohousing littermates. We found that maternal influence was the greater predictor of microbiome composition rather than genotype. With the rise in microbiome research across disciplines, our study should be viewed as a cautionary example that illustrates the importance of careful breeding and housing strategies when evaluating host-microbiome interactions.
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Affiliation(s)
- Veronica M Ringel-Scaia
- Graduate Program in Translational Biology, Medicine, and Health, Virginia Tech, Blacksburg, Virginia, USA.,Department of Biomedical Sciences and Pathobiology, Virginia Tech, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA
| | - Yufeng Qin
- Eukaryotic Transcriptional Regulation Group, Epigenetics and Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Cassidy A Thomas
- Department of Biomedical Sciences and Pathobiology, Virginia Tech, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA
| | - Kathleen E Huie
- Department of Biomedical Sciences and Pathobiology, Virginia Tech, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA
| | - Dylan K McDaniel
- Department of Biomedical Sciences and Pathobiology, Virginia Tech, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA
| | - Kristin Eden
- Department of Biomedical Sciences and Pathobiology, Virginia Tech, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA.,Department of Basic Science Education, Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA
| | - Paul A Wade
- Eukaryotic Transcriptional Regulation Group, Epigenetics and Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Irving C Allen
- Graduate Program in Translational Biology, Medicine, and Health, Virginia Tech, Blacksburg, Virginia, USA, .,Department of Biomedical Sciences and Pathobiology, Virginia Tech, Virginia-Maryland College of Veterinary Medicine, Blacksburg, Virginia, USA, .,Department of Basic Science Education, Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA,
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12
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Dubois H, van Loo G, Wullaert A. Nucleic Acid Induced Interferon and Inflammasome Responses in Regulating Host Defense to Gastrointestinal Viruses. Int Rev Cell Mol Biol 2019; 345:137-71. [PMID: 30904192 DOI: 10.1016/bs.ircmb.2018.08.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The gut bacterial and fungal communities residing in the gastrointestinal tract have undisputed far-reaching effects in regulating host health. In the meantime, however, metagenomic sequencing efforts are revealing enteric viruses as the most abundant dimension of the intestinal gut ecosystem, and the first gut virome-wide association studies showed that inflammatory bowel disease as well as type 1 diabetes could be linked to the presence or absence of particular viral inhabitants in the intestine. In line with the genetic component of these human diseases, mouse model studies demonstrated how beneficial functions of a resident virus can switch to detrimental inflammatory effects in a genetically predisposed host. Such viral-induced intestinal immune disturbances are also recapitulated by several gastrointestinal infectious viruses such as rotavirus and human norovirus. This wide range of viral effects on intestinal immunity emphasizes the need for understanding the innate immune responses to gastrointestinal viruses. Numerous nucleic acid sensors such as DexD/H helicases and AIM2 serve as cytosolic viral guardians to induce antiviral interferon and/or pro-inflammatory inflammasome responses. In both cases, pioneering examples are emerging in which RNA helicases cooperate with particular Nod-like receptors to trigger these cellular responses to enteric viruses. Here we summarize the reported beneficial versus detrimental effects of enteric viruses in the intestinal immune system, and we zoom in on the mechanisms through which sensing of nucleic acids from these enteric viruses trigger interferon and inflammasome responses.
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13
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Mulla MJ, Pasternak MC, Salmon JE, Chamley LW, Abrahams VM. Role of NOD2 in antiphospholipid antibody-induced and bacterial MDP amplification of trophoblast inflammation. J Autoimmun 2018; 98:103-112. [PMID: 30594350 DOI: 10.1016/j.jaut.2018.12.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 12/14/2018] [Accepted: 12/16/2018] [Indexed: 10/27/2022]
Abstract
Women with antiphospholipid antibodies (aPL) are at high risk for pregnancy complications, such as preeclampsia. We previously demonstrated that aPL recognizing β2GPI promote an extravillous trophoblast pro-inflammatory, anti-migratory and anti-angiogenic profile similar to that seen in preeclampsia. Since preeclampsia in the absence of aPL may have an underlying infectious element, women with aPL may be at increased risk for preeclampsia or other adverse outcomes if an infection is present. Our objective was to determine the impact the common bacterial component, muramyl dipeptide (MDP), has on trophoblast responses to aPL. Herein, we report that bacterial MDP amplifies trophoblast IL-1β expression, processing, and secretion in the presence of aPL through activation of NOD2. In the absence of MDP, NOD2 also mediates anti- β2GPI antibody-induced trophoblast IL-1β and VEGF secretion. Additionally, we report a role for extravillous trophoblast vimentin as a novel danger signal that contributes to the aPL-induced trophoblast IL-1β production. Together our data indicate that NOD2 mediates trophoblast inflammatory and angiogenic responses to aPL alone, and mediates trophoblast inflammation in the presence of bacterial MDP. These findings suggest that a bacterial infection at the maternal-fetal interface may exacerbate the impact aPL have on trophoblast inflammation and, thus, on pregnancy outcome.
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Affiliation(s)
- Melissa J Mulla
- Department of Obstetrics, Gynecology & Reproductive Sciences, Yale University, New Haven, CT, USA
| | - Monica C Pasternak
- Department of Obstetrics, Gynecology & Reproductive Sciences, Yale University, New Haven, CT, USA
| | - Jane E Salmon
- Department of Medicine, Hospital for Special Surgery, New York, NY, USA
| | - Lawrence W Chamley
- Department of Obstetrics & Gynecology, University of Auckland, Auckland, New Zealand
| | - Vikki M Abrahams
- Department of Obstetrics, Gynecology & Reproductive Sciences, Yale University, New Haven, CT, USA.
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14
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Grandjean T, Boucher A, Thepaut M, Monlezun L, Guery B, Faudry E, Kipnis E, Dessein R. The human NAIP-NLRC4-inflammasome senses the Pseudomonas aeruginosa T3SS inner-rod protein. Int Immunol 2018; 29:377-384. [PMID: 28992059 DOI: 10.1093/intimm/dxx047] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2017] [Accepted: 08/26/2017] [Indexed: 12/12/2022] Open
Abstract
While NLRC4-dependent sensing of intracellular Gram-negative pathogens such as Salmonella enterica serovar typhimurium is a beneficial host response, NLRC4-dependent sensing of the Pseudomonas aeruginosa type 3 secretion system (T3SS) has been shown to be involved in pathogenicity. In mice, different pathogen-associated microbial patterns are sensed by the combination of the NLRC4-inflammasome with different neuronal apoptosis inhibitory proteins (NAIPs). NAIP2 is involved in sensing PscI, an inner-rod protein of the P. aeruginosa T3SS. Surprisingly, only a single human NAIP (hNAIP) has been found. Moreover, there is no description of hNAIP-NLRC4 inflammasome recognition of T3SS inner-rod proteins in humans. Here, we show that the P. aeruginosa T3SS inner-rod protein PscI and needle protein PscF are both sensed by the hNAIP-NLRC4 inflammasome in human macrophages and PBMCs from healthy donors, allowing caspase-1 and IL-1β maturation and resulting in a robust inflammatory response. TLR4 and TLR2 are involved in redundantly sensing these two T3SS components.
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Affiliation(s)
- Teddy Grandjean
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France
| | - Anne Boucher
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France
| | - Marion Thepaut
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France
| | - Laura Monlezun
- Université Grenoble Alpes, F-38041 Grenoble, France.,CNRS, Bacterial Pathogenesis and Cellular Responses, ERL 5261, F-38054 Grenoble, France.,INSERM, UMR-S 1036, Biology of Cancer and Infection, F-38054 Grenoble, France.,CEA, DSV/iRTSV, F-38054 Grenoble, France
| | - Benoit Guery
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France.,Infectious Diseases Service, Centre Hospitalier Universitaire Vaudois and University of Lausanne, CH-1011 Lausanne, Switzerland
| | - Eric Faudry
- Université Grenoble Alpes, F-38041 Grenoble, France.,CNRS, Bacterial Pathogenesis and Cellular Responses, ERL 5261, F-38054 Grenoble, France.,INSERM, UMR-S 1036, Biology of Cancer and Infection, F-38054 Grenoble, France.,CEA, DSV/iRTSV, F-38054 Grenoble, France
| | - Eric Kipnis
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France
| | - Rodrigue Dessein
- EA 7366, Host-Pathogens Translational Research Group, Faculty of Medicine of Lille, University of Lille Nord de France, F-59000 Lille, France.,Microbiological Institute, Center of Biology and Pathology, Teaching University Hospital of Lille, Univ Lille Nord de France, F-59000 Lille, France
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15
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Moghaddas F, Zeng P, Zhang Y, Schützle H, Brenner S, Hofmann SR, Berner R, Zhao Y, Lu B, Chen X, Zhang L, Cheng S, Winkler S, Lehmberg K, Canna SW, Czabotar PE, Wicks IP, De Nardo D, Hedrich CM, Zeng H, Masters SL. Autoinflammatory mutation in NLRC4 reveals a leucine-rich repeat (LRR)-LRR oligomerization interface. J Allergy Clin Immunol 2018; 142:1956-1967.e6. [PMID: 29778503 PMCID: PMC6281029 DOI: 10.1016/j.jaci.2018.04.033] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 04/22/2018] [Accepted: 04/27/2018] [Indexed: 12/28/2022]
Abstract
Background Monogenic autoinflammatory disorders are characterized by dysregulation of the innate immune system, for example by gain-of-function mutations in inflammasome-forming proteins, such as NOD-like receptor family CARD-containing 4 protein (NLRC4). Objective Here we investigate the mechanism by which a novel mutation in the leucine-rich repeat (LRR) domain of NLRC4 (c.G1965C, p.W655C) contributes to autoinflammatory disease. Methods: We studied 2 unrelated patients with early-onset macrophage activation syndrome harboring the same de novo mutation in NLRC4. In vitro inflammasome complex formation was quantified by using flow cytometric analysis of apoptosis-associated speck-like protein containing a caspase recruitment domain (ASC) specks. Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)/Cas9 techniques and lentiviral transduction were used to generate THP-1 cells with either wild-type or mutant NLRC4 cDNA. Cell death and release of IL-1β/IL-18 were quantified by using flow cytometry and ELISA, respectively. Results The p.W655C NLRC4 mutation caused increased ASC speck formation, caspase-1–dependent cell death, and IL-1β/IL-18 production. ASC contributed to p.W655C NLRC4–mediated cytokine release but not cell death. Mutation of p.W655 activated the NLRC4 inflammasome complex by engaging with 2 interfaces on the opposing LRR domain of the oligomer. One key set of residues (p.D1010, p.D1011, p.L1012, and p.I1015) participated in LRR-LRR oligomerization when triggered by mutant NLRC4 or type 3 secretion system effector (PrgI) stimulation of the NLRC4 inflammasome complex. Conclusion This is the first report of a mutation in the LRR domain of NLRC4 causing autoinflammatory disease. c.G1965C/p.W655C NLRC4 increased inflammasome activation in vitro. Data generated from various NLRC4 mutations provides evidence that the LRR-LRR interface has an important and previously unrecognized role in oligomerization of the NLRC4 inflammasome complex.
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Affiliation(s)
- Fiona Moghaddas
- Inflammation Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Ping Zeng
- Department of Rheumatology, Guangzhou Women and Children's Medical Centre, Guangzhou, China
| | - Yuxia Zhang
- Immunology Laboratory, Guangzhou Institute of Paediatrics, Guangzhou, China
| | - Heike Schützle
- Department of Pediatrics, University Hospital and Faculty of Medicine Carl Gustav Carus, TU Dresden, Dresden, Germany
| | - Sebastian Brenner
- Department of Pediatrics, University Hospital and Faculty of Medicine Carl Gustav Carus, TU Dresden, Dresden, Germany
| | - Sigrun R Hofmann
- Department of Pediatrics, University Hospital and Faculty of Medicine Carl Gustav Carus, TU Dresden, Dresden, Germany
| | - Reinhard Berner
- Department of Pediatrics, University Hospital and Faculty of Medicine Carl Gustav Carus, TU Dresden, Dresden, Germany
| | - Yuanbo Zhao
- Immunology Laboratory, Guangzhou Institute of Paediatrics, Guangzhou, China; Department of Chemical Biology, Guizhou Medical University, Guiyang, China
| | - Bingtai Lu
- Immunology Laboratory, Guangzhou Institute of Paediatrics, Guangzhou, China
| | - Xiaoyun Chen
- Immunology Laboratory, Guangzhou Institute of Paediatrics, Guangzhou, China
| | - Li Zhang
- Immunology Laboratory, Guangzhou Institute of Paediatrics, Guangzhou, China
| | - Suyun Cheng
- Department of Rheumatology, Guangzhou Women and Children's Medical Centre, Guangzhou, China
| | - Stefan Winkler
- Department of Pediatrics, University Hospital and Faculty of Medicine Carl Gustav Carus, TU Dresden, Dresden, Germany
| | - Kai Lehmberg
- Division of Pediatric Stem Cell Transplantation and Immunology, University Medical Center Hamburg Eppendorf, Hamburg, Germany
| | - Scott W Canna
- Pediatric Rheumatology/RK Mellon Institute, Children's Hospital of Pittsburgh of UPMC, Pittsburgh, Pa
| | - Peter E Czabotar
- Department of Medical Biology, University of Melbourne, Parkville, Australia; Structural Biology Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Australia
| | - Ian P Wicks
- Inflammation Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia; Rheumatology Department, Royal Melbourne Hospital, Parkville, Australia
| | - Dominic De Nardo
- Inflammation Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia
| | - Christian M Hedrich
- Department of Pediatrics, University Hospital and Faculty of Medicine Carl Gustav Carus, TU Dresden, Dresden, Germany; Department of Women's & Children's Health, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom; Department of Paediatric Rheumatology, Alder Hey Children's NHS Foundation Trust Hospital, Liverpool, United Kingdom
| | - Huasong Zeng
- Department of Rheumatology, Guangzhou Women and Children's Medical Centre, Guangzhou, China
| | - Seth L Masters
- Inflammation Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Australia; Department of Medical Biology, University of Melbourne, Parkville, Australia; Immunology Laboratory, Guangzhou Institute of Paediatrics, Guangzhou, China.
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16
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Abstract
Over the last decade, invasive fungal infections have emerged as a growing threat to human health worldwide and novel treatment strategies are urgently needed. In this context, investigations into host-pathogen interactions represent an important and promising field of research. Antigen presenting cells such as macrophages and dendritic cells are strategically located at the frontline of defence against potential invaders. Importantly, these cells express germline encoded pattern recognition receptors (PRRs), which sense conserved entities from pathogens and orchestrate innate immune responses. Herein, we review the latest findings regarding the biology and functions of the different classes of PRRs involved in pathogenic fungal recognition. We also discuss recent literature on PRR collaboration/crosstalk and the mechanisms involved in inhibiting/regulating PRR signalling. Finally, we discuss how the accumulated knowledge on PRR biology, especially Dectin-1, has been used for the design of new immunotherapies against fungal infections.
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Affiliation(s)
- Emmanuel C Patin
- Division of Infection and Immunity, School of Medicine, Cardiff University, Cardiff CF14 4XN, Wales, United Kingdom
| | - Aiysha Thompson
- Division of Infection and Immunity, School of Medicine, Cardiff University, Cardiff CF14 4XN, Wales, United Kingdom
| | - Selinda J Orr
- Division of Infection and Immunity, School of Medicine, Cardiff University, Cardiff CF14 4XN, Wales, United Kingdom.
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17
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Townsend PD, Dixon CH, Slootweg EJ, Sukarta OCA, Yang AWH, Hughes TR, Sharples GJ, Pålsson LO, Takken FLW, Goverse A, Cann MJ. The intracellular immune receptor Rx1 regulates the DNA-binding activity of a Golden2-like transcription factor. J Biol Chem 2018; 293:3218-3233. [PMID: 29217772 PMCID: PMC5836133 DOI: 10.1074/jbc.ra117.000485] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 11/14/2017] [Indexed: 12/22/2022] Open
Abstract
Plant nucleotide-binding leucine-rich repeat (NLR) proteins enable the immune system to recognize and respond to pathogen attack. An early consequence of immune activation is transcriptional reprogramming, and some NLRs have been shown to act in the nucleus and interact with transcription factors. The Rx1 NLR protein of potato is further able to bind and distort double-stranded DNA. However, Rx1 host targets that support a role for Rx1 in transcriptional reprogramming at DNA are unknown. Here, we report a functional interaction between Rx1 and NbGlk1, a Golden2-like transcription factor. Rx1 binds to NbGlk1 in vitro and in planta. NbGlk1 binds to known Golden2-like consensus DNA sequences. Rx1 reduces the binding affinity of NbGlk1 for DNA in vitro. NbGlk1 activates cellular responses to potato virus X, whereas Rx1 associates with NbGlk1 and prevents its assembly on DNA in planta unless activated by PVX. This study provides new mechanistic insight into how an NLR can coordinate an immune signaling response at DNA following pathogen perceptions.
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Affiliation(s)
- Philip D Townsend
- From the Department of Biosciences
- Biophysical Sciences Institute, and
| | | | - Erik J Slootweg
- the Laboratory of Nematology, Department of Plant Sciences, Wageningen University, 6708 PB Wageningen, The Netherlands
| | - Octavina C A Sukarta
- the Laboratory of Nematology, Department of Plant Sciences, Wageningen University, 6708 PB Wageningen, The Netherlands
| | - Ally W H Yang
- the Donnelly Centre, University of Toronto, Toronto, Ontario M5S 3E1, Canada, and
| | - Timothy R Hughes
- the Donnelly Centre, University of Toronto, Toronto, Ontario M5S 3E1, Canada, and
| | - Gary J Sharples
- From the Department of Biosciences
- Biophysical Sciences Institute, and
| | - Lars-Olof Pålsson
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - Frank L W Takken
- Molecular Plant Pathology, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Aska Goverse
- the Laboratory of Nematology, Department of Plant Sciences, Wageningen University, 6708 PB Wageningen, The Netherlands
| | - Martin J Cann
- From the Department of Biosciences,
- Biophysical Sciences Institute, and
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18
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Coutermarsh-Ott S, Simmons A, Capria V, LeRoith T, Wilson JE, Heid B, Philipson CW, Qin Q, Hontecillas-Magarzo R, Bassaganya-Riera J, Ting JPY, Dervisis N, Allen IC. NLRX1 suppresses tumorigenesis and attenuates histiocytic sarcoma through the negative regulation of NF-κB signaling. Oncotarget 2018; 7:33096-110. [PMID: 27105514 PMCID: PMC5078078 DOI: 10.18632/oncotarget.8861] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 03/28/2016] [Indexed: 11/25/2022] Open
Abstract
Histiocytic sarcoma is an uncommon malignancy in both humans and veterinary species. Research exploring the pathogenesis of this disease is scarce; thus, diagnostic and therapeutic options for patients are limited. Recent publications have suggested a role for the NLR, NLRX1, in acting as a tumor suppressor. Based on these prior findings, we hypothesized that NLRX1 would function to inhibit tumorigenesis and thus the development of histiocytic sarcoma. To test this, we utilized Nlrx1-/- mice and a model of urethane-induced tumorigenesis. Nlrx1-/- mice exposed to urethane developed splenic histiocytic sarcoma that was associated with significant up-regulation of the NF-κB signaling pathway. Additionally, development of these tumors was also significantly associated with the increased regulation of genes associated with AKT signaling, cell death and autophagy. Together, these data show that NLRX1 suppresses tumorigenesis and reveals new genetic pathways involved in the pathobiology of histiocytic sarcoma.
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Affiliation(s)
- Sheryl Coutermarsh-Ott
- Department of Biological Sciences and Pathobiology, Virginia Tech, VA-MD Regional College of Veterinary Medicine, Blacksburg, VA, USA
| | - Alysha Simmons
- Department of Biological Sciences and Pathobiology, Virginia Tech, VA-MD Regional College of Veterinary Medicine, Blacksburg, VA, USA
| | - Vittoria Capria
- Department of Biological Sciences and Pathobiology, Virginia Tech, VA-MD Regional College of Veterinary Medicine, Blacksburg, VA, USA
| | - Tanya LeRoith
- Department of Biological Sciences and Pathobiology, Virginia Tech, VA-MD Regional College of Veterinary Medicine, Blacksburg, VA, USA
| | - Justin E Wilson
- Department of Genetics, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Bettina Heid
- Department of Biological Sciences and Pathobiology, Virginia Tech, VA-MD Regional College of Veterinary Medicine, Blacksburg, VA, USA
| | - Casandra W Philipson
- Virginia Tech, Virginia Bioinformatics Institute, Nutritional Immunology and Molecular Medicine Laboratory, Blacksburg, VA, USA
| | - Qizhi Qin
- Department of Biological Sciences and Pathobiology, Virginia Tech, VA-MD Regional College of Veterinary Medicine, Blacksburg, VA, USA
| | - Raquel Hontecillas-Magarzo
- Virginia Tech, Virginia Bioinformatics Institute, Nutritional Immunology and Molecular Medicine Laboratory, Blacksburg, VA, USA
| | - Josep Bassaganya-Riera
- Virginia Tech, Virginia Bioinformatics Institute, Nutritional Immunology and Molecular Medicine Laboratory, Blacksburg, VA, USA
| | - Jenny P-Y Ting
- Department of Genetics, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Nikolaos Dervisis
- Department of Small Animal Clinical Sciences, Virginia Tech, VA-MD Regional College of Veterinary Medicine, Blacksburg, VA, USA
| | - Irving C Allen
- Department of Biological Sciences and Pathobiology, Virginia Tech, VA-MD Regional College of Veterinary Medicine, Blacksburg, VA, USA
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19
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Khare S, Radian AD, Dorfleutner A, Stehlik C. Measuring NLR Oligomerization I: Size Exclusion Chromatography, Co-immunoprecipitation, and Cross-Linking. Methods Mol Biol 2016; 1417:131-43. [PMID: 27221486 DOI: 10.1007/978-1-4939-3566-6_8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
Oligomerization of nod-like receptors (NLRs) can be detected by several biochemical techniques dependent on the stringency of protein-protein interactions. Some of these biochemical methods can be combined with functional assays, such as caspase-1 activity assay. Size exclusion chromatography (SEC) allows separation of native protein lysates into different sized complexes by fast protein liquid chromatography (FPLC) for follow-up analysis. Using co-immunoprecipitation (co-IP), combined with SEC or on its own, enables subsequent antibody-based purification of NLR complexes and associated proteins, which can then be analyzed by immunoblot and/or subjected to functional caspase-1 activity assay. Chemical cross-linking covalently joins two or more molecules, thus capturing the oligomeric state with high sensitivity and stability. Apoptosis-associated speck-like protein containing a caspase activation domain (ASC) oligomerization has been successfully used as readout for NLR or AIM2-like receptor (ALR) inflammasome activation in response to various pathogen- or damage-associated molecular patterns (PAMPs or DAMPs) in human and mouse macrophages and THP-1 cells. Here, we provide a detailed description of the methods used for NLRP7 oligomerization in response to infection with Staphylococcus aureus (S. aureus) in primary human macrophages, co-immunoprecipitation and immunoblot analysis of NLRP7 and NLRP3 inflammasome complexes, as well as caspase-1 activity assays. Also, ASC oligomerization is shown in response to dsDNA, LPS/ATP, and LPS/nigericin in mouse bone marrow-derived macrophages (BMDMs) and/or THP-1 cells or human primary macrophages.
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20
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Lupfer CR, Stokes KL, Kuriakose T, Kanneganti TD. Deficiency of the NOD-Like Receptor NLRC5 Results in Decreased CD8 + T Cell Function and Impaired Viral Clearance. J Virol 2017; 91:e00377-17. [PMID: 28615208 DOI: 10.1128/JVI.00377-17] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 06/05/2017] [Indexed: 12/30/2022] Open
Abstract
Pathogen recognition receptors are vital components of the immune system. Engagement of these receptors is important not only for instigation of innate immune responses to invading pathogens but also for initiating the adaptive immune response. Members of the NOD-like receptor (NLR) family of pathogen recognition receptors have important roles in orchestrating this response. The NLR family member NLRC5 regulates major histocompatibility complex class I (MHC-I) expression during various types of infections, but its role in immunity to influenza A virus (IAV) is not well studied. Here we show that Nlrc5-/- mice exhibit an altered CD8+ T cell response during IAV infection compared to that of wild-type (WT) mice. Nlrc5-/- mice have decreased MHC-I expression on hematopoietic cells and fewer CD8+ T cells prior to infection. NLRC5 deficiency does not affect the generation of antigen-specific CD8+ T cells following IAV infection; however, a change in epitope dominance is observed in Nlrc5-/- mice. Moreover, IAV-specific CD8+ T cells from Nlrc5-/- mice have impaired effector functions. This change in the adaptive immune response is associated with impaired viral clearance in Nlrc5-/- mice. Collectively, our results demonstrate an important role for NLRC5 in regulation of antiviral immune responses and viral clearance during IAV infection.IMPORTANCE The NOD-like receptor family member NLRC5 is known to regulate expression of MHC-I as well as other genes required for antigen processing. In addition, NLRC5 also regulates various immune signaling pathways. In this study, we investigated the role of NLRC5 during influenza virus infection and found a major role for NLRC5 in restricting virus replication and promoting viral clearance. The observed increases in viral titers in NLRC5-deficient mice correlated with impaired effector CD8+ T cell responses. Although NLRC5-deficient mice were defective at clearing the virus, they did not show an increase in morbidity or mortality following influenza virus infection because of other compensatory immune mechanisms. Therefore, our study highlights how NLRC5 regulates multiple immune effector mechanisms to promote the host defense during influenza virus infection.
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González García A, Patier de la Peña JL, Ortego Centeno N. Autoinflammatory diseases in adults. Clinical characteristics and prognostic implications. Rev Clin Esp 2016; 217:108-116. [PMID: 27702442 DOI: 10.1016/j.rce.2016.08.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 08/07/2016] [Accepted: 08/17/2016] [Indexed: 02/06/2023]
Abstract
Autoinflammatory diseases are clinical conditions with inflammatory manifestations that present in a periodic or persistent manner and are caused by acquired or hereditary disorders of the innate immune response. In general, these diseases are more common in childhood, but cases have been reported in adults and are therefore important for all specialists. There are few references on these diseases in adults due to their low prevalence and underdiagnosis. The aim of this study is to review the scientific literature on these disorders to systematise their clinical, prognostic and treatment response characteristics in adults.
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Affiliation(s)
- A González García
- Servicio de Medicina Interna, Hospital Universitario Ramón y Cajal , Madrid, España.
| | | | - N Ortego Centeno
- Unidad de Enfermedades Autoinmunes Sistémicas, Complejo Hospitalario Universitario Granada , Granada, España
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Zou PF, Chang MX, Li Y, Xue NN, Li JH, Chen SN, Nie P. NOD2 in zebrafish functions in antibacterial and also antiviral responses via NF-κB, and also MDA5, RIG-I and MAVS. Fish Shellfish Immunol 2016; 55:173-185. [PMID: 27235368 DOI: 10.1016/j.fsi.2016.05.031] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 05/21/2016] [Accepted: 05/22/2016] [Indexed: 06/05/2023]
Abstract
NOD2/RIPK2 signalling plays essential role in the modulation of innate and adaptive immunity in mammals. In this study, NOD2 was functionally characterized in zebrafish (Danio rerio), and its interaction with a receptor-interaction protein, RIPK2, and RLRs such as MDA5 and RIG-I, as well as the adaptor, MAVS was revealed in fish innate immunity. The expression of NOD2 and RIPK2 in ZF4 cells has been constitutive and can be induced by the infection of Edwardsiella tarda and SVCV. The NOD2 can sense MDP in PGN from Gram-negative and -positive bacteria. It is further revealed that the NOD2 and RIPK2 can activate NF-κB and IFN promoters, inducing significantly antiviral defense against SVCV infection. As observed in the reduced bacterial burden in RIPK2 overexpressed cells, RIPK2 also has a role in inhibiting the bacterial replication. The overexpression of NOD2 in zebrafish embryos resulted in the increase of immune gene expression, especially those encoding PRRs and cytokines involved in antiviral response such as MDA5, RIG-I, and type I IFNs, etc. Luciferase reporter assays and co-immunoprecipitation assays demonstrated that zebrafish NOD2 is associated with MDA5 and RIG-I in signalling pathway. In addition, it is further demonstrated that RIPK2 and MAVS in combination with NOD2 have an enhanced role in NOD2-mediated NF-κB and type I IFN activation. It is concluded that teleost fish NOD2 can not only sense MDP for activating innate immunity as reported in mammals, but can also interact with other PRRs to form a network in antiviral innate response.
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Affiliation(s)
- Peng Fei Zou
- College of Fisheries, Jimei University, 43 Yindou Road, Xiamen, Fujian Province, 361021, China; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
| | - Ming Xian Chang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
| | - Ying Li
- Department of Environmental Science and Engineering, Xiamen University, Tan Kah Kee College, Zhangzhou, Fujian Province, 363105, China
| | - Na Na Xue
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
| | - Jun Hua Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
| | - Shan Nan Chen
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China
| | - Pin Nie
- College of Fisheries, Jimei University, 43 Yindou Road, Xiamen, Fujian Province, 361021, China; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei Province, 430072, China.
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Abstract
The interleukin-1 (IL-1) family consists of several pro- or anti-inflammatory proteins, with pro-inflammatory IL-1β being its best characterized member. IL-1β is one of the most prominent mediators of inflammation resulting in fever and immune activation via binding to IL-1 receptor 1. Due to its potency, its secretion is tightly regulated. First the transcription of the biologically inactive proform is induced by TLR activation, TNF, or IL-1 receptor activation by mature IL-1α or IL-1β. For the secretion of IL-1β, inflammasome activation as second stimulus is needed. Inflammasomes are cytosolic protein complexes whose activation results in the maturation of inflammatory caspases such as caspase-1. Caspase-1 then cleaves the inactive pro-IL-1β into its mature form which is then being secreted. While IL-1α and IL-1β are considered pro-inflammatory, IL-1Ra as a naturally occurring receptor antagonist acts as an inhibitor on IL-1 receptor signaling. Further members of the IL-1 family, such as IL-18, IL-33, or IL-36, are even involved in T-helper-cell differentiation and will also be discussed in this chapter.
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Jaworska J, Coulombe F, Downey J, Tzelepis F, Shalaby K, Tattoli I, Berube J, Rousseau S, Martin JG, Girardin SE, McCullers JA, Divangahi M. NLRX1 prevents mitochondrial induced apoptosis and enhances macrophage antiviral immunity by interacting with influenza virus PB1-F2 protein. Proc Natl Acad Sci U S A 2014; 111:E2110-9. [PMID: 24799673 DOI: 10.1073/pnas.1322118111] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
To subvert host immunity, influenza A virus (IAV) induces early apoptosis in innate immune cells by disrupting mitochondria membrane potential via its polymerase basic protein 1-frame 2 (PB1-F2) accessory protein. Whether immune cells have mechanisms to counteract PB1-F2-mediated apoptosis is currently unknown. Herein, we define that the host mitochondrial protein nucleotide-binding oligomerization domain-like receptor (NLR)X1 binds to viral protein PB1-F2, preventing IAV-induced macrophage apoptosis and promoting both macrophage survival and type I IFN signaling. We initially observed that Nlrx1-deficient mice infected with IAV exhibited increased pulmonary viral replication, as well as enhanced inflammatory-associated pulmonary dysfunction and morbidity. Analysis of the lungs of IAV-infected mice revealed markedly enhanced leukocyte recruitment but impaired production of type I IFN in Nlrx1(-/-) mice. Impaired type I IFN production and enhanced viral replication was recapitulated in Nlrx1(-/-) macrophages and was associated with increased mitochondrial mediated apoptosis. Through gain- and loss-of-function strategies for protein interaction, we identified that NLRX1 directly bound PB1-F2 in the mitochondria of macrophages. Using a recombinant virus lacking PB1-F2, we confirmed that deletion of PB1-F2 abrogated NLRX1-dependent macrophage type I IFN production and apoptosis. Thus, our results demonstrate that NLRX1 acts as a mitochondrial sentinel protecting macrophages from PB1-F2-induced apoptosis and preserving their antiviral function. We further propose that NLRX1 is critical for macrophage immunity against IAV infection by sensing the extent of viral replication and maintaining a protective balance between antiviral immunity and excessive inflammation within the lungs.
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Ratsimandresy RA, Dorfleutner A, Stehlik C. An Update on PYRIN Domain-Containing Pattern Recognition Receptors: From Immunity to Pathology. Front Immunol 2013; 4:440. [PMID: 24367371 PMCID: PMC3856626 DOI: 10.3389/fimmu.2013.00440] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 11/25/2013] [Indexed: 12/11/2022] Open
Abstract
Cytosolic pattern recognition receptors (PRRs) sense a wide range of endogenous danger-associated molecular patterns as well as exogenous pathogen-associated molecular patterns. In particular, Nod-like receptors containing a pyrin domain (PYD), called NLRPs, and AIM2-like receptors (ALRs) have been shown to play a critical role in host defense by facilitating clearance of pathogens and maintaining a healthy gut microflora. NLRPs and ALRs both encode a PYD, which is crucial for relaying signals that result in an efficient innate immune response through activation of several key innate immune signaling pathways. However, mutations in these PRRs have been linked to the development of auto-inflammatory and autoimmune diseases. In addition, they have been implicated in metabolic diseases. In this review, we summarize the function of PYD-containing NLRPs and ALRs and address their contribution to innate immunity, host defense, and immune-linked diseases.
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Affiliation(s)
- Rojo A Ratsimandresy
- Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University , Chicago, IL , USA
| | - Andrea Dorfleutner
- Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University , Chicago, IL , USA
| | - Christian Stehlik
- Division of Rheumatology, Department of Medicine, Feinberg School of Medicine, Northwestern University , Chicago, IL , USA ; Robert H. Lurie Comprehensive Cancer Center, Interdepartmental Immunobiology Center and Skin Disease Research Center, Feinberg School of Medicine, Northwestern University , Chicago, IL , USA
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26
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Jin C, Flavell RA. Innate sensors of pathogen and stress: linking inflammation to obesity. J Allergy Clin Immunol 2013; 132:287-94. [PMID: 23905917 DOI: 10.1016/j.jaci.2013.06.022] [Citation(s) in RCA: 140] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 06/20/2013] [Accepted: 06/21/2013] [Indexed: 12/11/2022]
Abstract
Pathogen and nutrient response pathways are evolutionarily conserved and highly integrated to regulate metabolic and immune homeostasis. Excessive nutrients can be sensed by innate pattern recognition receptors as danger signals either directly or through production of endogenous ligands or modulation of intestinal microbiota. This triggers the activation of downstream inflammatory cascades involving nuclear factor κB and mitogen-activated protein kinase and ultimately induces the production of inflammatory cytokines and immune cell infiltration in various metabolic tissues. The chronic low-grade inflammation in the brain, islet, liver, muscle, and adipose tissue further promotes insulin resistance, energy imbalance, and impaired glucose/lipid metabolism, contributing to the metabolic complications of obesity, such as diabetes and atherosclerosis. In addition, innate pathogen receptors have now emerged as a critical link between the intestinal microbiota and host metabolism. In this review we summarize recent studies demonstrating the important roles of innate pathogen receptors, including Toll-like receptors, nucleotide oligomerization domain containing proteins, and inflammasomes in mediating the inflammatory response to metabolic stress in different tissues and highlight the interaction of innate pattern recognition receptors, gut microbiota, and nutrients during the development of obesity and related metabolic disorders.
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Jakopin Ž, Gobec M, Kodela J, Hazdovac T, Mlinarič-Raščan I, Sollner Dolenc M. Synthesis of conformationally constrained γ-D-glutamyl-meso-diaminopimelic acid derivatives as ligands of nucleotide-binding oligomerization domain protein 1 (Nod1). Eur J Med Chem 2013; 69:232-43. [PMID: 24044936 DOI: 10.1016/j.ejmech.2013.08.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 06/07/2013] [Accepted: 08/12/2013] [Indexed: 11/26/2022]
Abstract
Nod1, an important member of the pattern recognition receptor family, remains a virtually unexploited target. Harnessing its innate immune stimulatory properties still remains an unfulfilled goal of medicinal chemistry. Nucleotide-binding oligomerization domain protein 1 (Nod1) agonists have been shown to boost the inflammatory responses against pathogenic microbes and could thus constitute a new class of broad spectrum antimicrobial agents. To gain additional insight into the structure/activity relationships of Nod1 agonistic compounds, a series of novel, conformationally constrained γ-D-glutamyl-meso-diaminopimelic acid (iE-DAP) analogs have been designed and synthesized. Ramos-Blue cells expressing Nod1 were used to screen and validate our compounds for their Nod1-agonist activity. Their immunomodulatory properties were subsequently determined in vitro, by evaluating their capacity to induce pro-inflammatory cytokine and chemokine production from human peripheral blood mononuclear cells (PBMC), by themselves and in synergy with lipopolysaccharide (LPS), a Toll-like receptor 4 (TLR4) ligand. The synthesized iE-DAP analogs were shown to possess immuno-enhancing properties as a result of their potent and specific Nod1-agonistic effect. The activity of the compound exhibiting the greatest capacity to induce pro-inflammatory cytokine release from PBMC surpassed that of lauroyl-γ-D-glutamyl-meso-diaminopimelic acid (C12-iE-DAP).
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Affiliation(s)
- Žiga Jakopin
- Faculty of Pharmacy, University of Ljubljana, Aškerčeva 7, SI-1000 Ljubljana, Slovenia.
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28
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Radian AD, de Almeida L, Dorfleutner A, Stehlik C. NLRP7 and related inflammasome activating pattern recognition receptors and their function in host defense and disease. Microbes Infect 2013; 15:630-9. [PMID: 23618810 DOI: 10.1016/j.micinf.2013.04.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Revised: 04/09/2013] [Accepted: 04/09/2013] [Indexed: 12/16/2022]
Abstract
Host defense requires the maturation and release of the pro-inflammatory cytokines interleukin (IL)-1β and IL-18 and the induction of pyroptotic cell death, which depends on the activation of inflammatory Caspases within inflammasomes by innate immune cells. Several cytosolic pattern recognition receptors (PRRs) have been implicated in this process in response to infectious and sterile agonists. Here we summarize the current knowledge on inflammasome-organizing PRRs, emphasizing the recently described NLRP7, and their implications in human disease.
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29
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Ganz M, Csak T, Nath B, Szabo G. Lipopolysaccharide induces and activates the Nalp3 inflammasome in the liver. World J Gastroenterol 2011; 17:4772-8. [PMID: 22147977 PMCID: PMC3229625 DOI: 10.3748/wjg.v17.i43.4772] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2010] [Revised: 05/26/2011] [Accepted: 05/30/2011] [Indexed: 02/06/2023] Open
Abstract
AIM: To examine the activation of the Nalp3 inflammasome and its downstream targets following lipopolysaccharide (LPS)-induced stimulation in the liver.
METHODS: Six-to-eight-week-old C57BL/6 chow fed mice were injected intraperitoneally with 0.5 μg/g bodyweight LPS and sacrificed 2, 4, 6, 18 or 24 h later. LPS-induced liver damage was confirmed by a biochemical assay to detect alanine aminotransferase (ALT) levels. To determine if LPS stimulation in the liver led to activation of the inflammasome, real-time quantitative polymerase chain reaction was used to evaluate the mRNA expression of components of the Nalp3 inflammasome. Enzyme-linked immunosorbent assays were used to determine the protein expression levels of several downstream targets of the Nalp3 inflammasome, including caspase-1 and two cytokine targets of caspase-1, interleukin (IL)-1β and IL-18.
RESULTS: We found that LPS injection resulted in liver damage as indicated by elevated ALT levels. This was associated with a significant increase in both mRNA and protein levels of the proinflammatory cytokine tumor necrosis factor (TNF)-α in the liver, as well as increased levels of TNFs in serum. We showed that LPS stimulation led to upregulation of mRNA levels in the liver for all the receptor components of the inflammasome, including Nalp3, Nalp1, pannexin-1 and the adaptor molecule apoptosis-associated speck-like, caspase recruitment domain-domain containing protein. We also found increased levels of mRNA and protein for caspase-1, a downstream target of the inflammasome. In addition, LPS challenge led to increased levels of both mRNA and protein in the liver for two cytokine targets of caspase-1, IL-1β and IL-18. Interestingly, substantial baseline expression of pre-IL-1β and pre-IL-18 was found in the liver. Inflammasome and caspase-1 activation was indicated by the significant increase in the active forms of IL-1β and IL-18 after LPS stimulation.
CONCLUSION: Our results show that the Nalp3 inflammasome is upregulated and activated in the liver in response to LPS stimulation.
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Affiliation(s)
- J M Uronis
- Department of Medicine and Center for GI Biology and Disease, University of North Carolina at Chapel Hill, Chapel Hill, NC, U.S.A
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