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Koushik S, Joshi N, Nagaraju S, Mahmood S, Mudeenahally K, Padmavathy R, Jegatheesan SK, Mullangi R, Rajagopal S. PAD4: pathophysiology, current therapeutics and future perspective in rheumatoid arthritis. Expert Opin Ther Targets 2017; 21:433-447. [PMID: 28281906 DOI: 10.1080/14728222.2017.1294160] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
INTRODUCTION Peptidyl arginine deiminase 4 (PAD4) is an enzyme that plays an important role in gene expression, turning out genetic code into functional products in the body. It is involved in a key post translational modification, which involves the conversion of arginine to citrulline. It regulates various processes such as apoptosis, innate immunity and pluripotency, while its dysregulation has a great impact on the genesis of various diseases. Over the last few years PAD4 has emerged as a potential therapeutic target for the treatment of rheumatoid arthritis (RA). Areas covered: In this review, we discuss the basic structure and function of PAD4, along with the role of altered PAD4 activity in the onset of RA and other maladies. We also elucidate the role of PAD4 variants in etiology of RA among several ethnic groups and the current pre-clinical inhibitors to regulate PAD4. Expert opinion: Citrullination has a crucial role in RA and several other disorders. Since PAD4 is an initiator of the citrullination, it is an important therapeutic target for inflammatory diseases. Therefore, an in depth knowledge of the roles and activity of PAD4 is required to explore more effective ways to conquer PAD4 related ailments, especially RA.
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Affiliation(s)
- Sindhu Koushik
- a Bioinformatics , Jubilant Biosys Ltd ., Bangalore , India
| | - Nivedita Joshi
- a Bioinformatics , Jubilant Biosys Ltd ., Bangalore , India
| | | | - Sameer Mahmood
- a Bioinformatics , Jubilant Biosys Ltd ., Bangalore , India
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Westhorpe CL, Bayard JE, O'Sullivan KM, Hall P, Cheng Q, Kitching AR, Hickey MJ. In Vivo Imaging of Inflamed Glomeruli Reveals Dynamics of Neutrophil Extracellular Trap Formation in Glomerular Capillaries. THE AMERICAN JOURNAL OF PATHOLOGY 2017; 187:318-331. [DOI: 10.1016/j.ajpath.2016.10.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 10/04/2016] [Accepted: 10/06/2016] [Indexed: 12/23/2022]
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Protective effect of Cl-amidine against CLP-induced lethal septic shock in mice. Sci Rep 2016; 6:36696. [PMID: 27819302 PMCID: PMC5098180 DOI: 10.1038/srep36696] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 10/19/2016] [Indexed: 12/11/2022] Open
Abstract
Production of innate and adaptive immune cells from hematopoietic stem cells, and maturation of T lymphocytes are effective immune responses to fight severe microbial infection. In sepsis, this emergency myelopoiesis is damaged, leading to failure of bacterial clearance, and excessive stress-induced steroids cause immature T-lymphocyte apoptosis in thymus. We recently found that Cl-amidine, a peptidylarginine deiminase (PAD) inhibitor, improves survival in a mouse model of cecal ligation and puncture (CLP)-induced septic shock. In the present study we investigated how Cl-amidine promotes survival, focusing on protective effects of Cl-amidine on immune response. We confirmed survival-improving effect of Cl-amidine and are the first to explore the role of Cl-amidine in immune response. CLP caused bone marrow (BM) and thymus atrophy, decreased innate immune cells in BM. CLP increased levels of cytokines (IL-1β, IL-6, and TNF-α) and bacteria load in blood/liver. In primary splenocyte culture, lipopolysaccharide increased TNF-α production. In contrast, Cl-amidine attenuated these CLP and lipopolysaccharide-induced alterations. Moreover, Cl-amidine increased circulating monocytes. Collectively, our results demonstrate Cl-amidine plays protective roles by significantly decreasing BM and thymus atrophy, restoring innate immune cells in BM, increasing blood monocytes and blood/liver bacteria clearance, and attenuating pro-inflammatory cytokine production in a murine model of lethal sepsis.
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104
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Witalison EE, Cui X, Causey CP, Thompson PR, Hofseth LJ. Molecular targeting of protein arginine deiminases to suppress colitis and prevent colon cancer. Oncotarget 2016; 6:36053-62. [PMID: 26440311 PMCID: PMC4742161 DOI: 10.18632/oncotarget.5937] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 09/16/2015] [Indexed: 12/19/2022] Open
Abstract
Ulcerative colitis (UC) is a chronic disease, in which the lining of the colon becomes inflamed and develops ulcers leading to abdominal pain, diarrhea, and rectal bleeding. The extent of these symptoms depends on disease severity. The protein arginine deiminase (PAD) family of enzymes converts peptidyl-Arginine to peptidyl-Citrulline through citrullination. PADs are dysregulated, with abnormal citrullination in many diseases, including UC and colorectal cancer (CRC). We have developed the small molecule, pan-PAD inhibitor, Chlor-amidine (Cl-amidine), with multiple goals, including treating UC and preventing CRC. Building off our recent results showing that: 1) Cl-amidine suppresses colitis in vivo in a dextran sulfate sodium (DSS) mouse model; and 2) Cl-amidine induces microRNA (miR)-16 in vitro causing cell cycle arrest, we tested the hypothesis that Cl-amidine can prevent tumorigenesis and that miR-16 induction, by Cl-amidine, may be involved in vivo. Consistent with our hypothesis, we present evidence that Cl-amidine, delivered in the drinking water, prevents colon tumorigenesis in our mouse model of colitis-associated CRC where mice are given carcinogenic azoxymethane (AOM), followed by multiple cycles of 2% DSS to induce colitis. To begin identifying mechanisms, we examined the effects of Cl-amidine on miR-16. Results show miR-16 suppression during the colitis-to-cancer sequence in colon epithelial cells, which was rescued by drinking Cl-amidine. Likewise, Ki67 and cellular proliferation targets of miR-16 (Cyclins D1 and E1) were suppressed by Cl-amidine. The decrease in cell proliferation markers and increase in tumor suppressor miRNA expression potentially define a mechanism of how Cl-amidine is suppressing tumorigenesis in vivo.
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Affiliation(s)
- Erin E Witalison
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, SC, USA
| | - Xiangli Cui
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, SC, USA.,Shanxi Medical University, Taiyun, China
| | - Corey P Causey
- Department of Chemistry, University of North Florida, Jacksonville, FL, USA
| | - Paul R Thompson
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA, USA
| | - Lorne J Hofseth
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, SC, USA
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Inhibition of NET Release Fails to Reduce Adipose Tissue Inflammation in Mice. PLoS One 2016; 11:e0163922. [PMID: 27701440 PMCID: PMC5049774 DOI: 10.1371/journal.pone.0163922] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 09/17/2016] [Indexed: 11/19/2022] Open
Abstract
Obesity-associated diseases such as Type 2 diabetes, liver disease and cardiovascular diseases are profoundly mediated by low-grade chronic inflammation of the adipose tissue. Recently, the importance of neutrophils and neutrophil-derived myeloperoxidase and neutrophil elastase on the induction of insulin resistance has been established. Since neutrophil elastase and myeloperoxidase are critically involved in the release of neutrophil extracellular traps (NETs), we here hypothesized that NETs may be relevant to early adipose tissue inflammation. Thus, we tested the effect of the Peptidyl Arginine Deiminase 4 inhibitor Cl-amidine, a compound preventing histone citrullination and subsequent NET release, in a mouse model of adipose tissue inflammation. C57BL6 mice received a 60% high fat diet for 10 weeks and were treated with either Cl-amidine or vehicle. Flow cytometry of adipose tissue and liver, immunohistological analysis and glucose and insulin tolerance tests were performed to determine the effect of the treatment and diet. Although high fat diet feeding induced insulin resistance no significant effect was observed between the treatment groups. In addition no effect was found in leukocyte infiltration and activation in the adipose tissue and liver. Therefore we concluded that inhibition of neutrophil extracellular trap formation may have no clinical relevance for early obesity-mediated pathogenesis of the adipose tissue and liver.
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106
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Citrullination of glial intermediate filaments is an early response in retinal injury. Mol Vis 2016; 22:1137-1155. [PMID: 27703308 PMCID: PMC5040453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 09/23/2016] [Indexed: 11/06/2022] Open
Abstract
PURPOSE A hallmark of retinal gliosis is the increased detection and modification of the type III intermediate filament (IF) proteins vimentin and glial fibrillary acidic protein (GFAP). Here, we investigated vimentin and GFAP in Müller glia in a mouse model of alkali injury, focusing on the posttranslational modification of citrullination. METHODS Mice were injured by corneal exposure to 1.0 N NaOH, and eyes were enucleated at different time points following injury. The levels of soluble and cytoskeletal forms of IF proteins and citrullination were measured using western blot analysis. Citrullinated GFAP was identified by immunoprecipitation followed by two-dimensional (2D) isoelectric focusing-polyacrylamide gel electrophoresis (IEF-PAGE) western blotting using a specific antibody that recognizes citrullinated GFAP. Vimentin, GFAP, and citrullinated proteins were localized in the retina by immunohistochemistry (IHC). Drug treatments were investigated in retinal explant cultures of posterior eyecups obtained from mouse eyes that were injured in vivo. RESULTS Detection of GFAP in injured retinas increased over a period of 1 to 7 days, showing increased levels in both soluble and cytoskeletal forms of this IF protein. The global level of citrullinated proteins was also induced over this period, with low-salt buffer extraction showing the most abundant early changes in citrullination. Using IHC, we found that GFAP filaments assembled at Müller glial end feet, growing in size with time through the inner layers of the retina at 1-3 h postinjury. Interestingly, over this early time period, levels of soluble citrullinated proteins also increased within the retina, as detected by western blotting, coincident with the localization of the citrullinated epitopes on growing GFAP filaments and existing vimentin filaments by 3 h after injury. Taking advantage of the in vivo injury model to promote a robust gliotic response, posterior eyecups from 7-day postinjured eyes were treated in explant cultures with the peptidyl arginine deiminase inhibitor Cl-amidine, which was found to reduce global citrullination. Surprisingly, the detection of injury-induced high-molecular-weight GFAP species containing citrullinated epitopes was also reduced by Cl-amidine treatment. Using a low dose of the potent type III IF drug withaferin A (WFA), we showed that Cl-amidine treatment in combination with WFA reduced global protein citrullination further, suggesting that GFAP may be a key component of pathological citrullinated targets. CONCLUSIONS Our findings illuminate citrullination as a potential novel target for trauma-induced retinal gliosis. We also propose that strategies for combining drugs targeting type III IFs and citrullination may potentiate tissue repair, which is an idea that needs to be validated in vivo.
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Biron BM, Chung CS, O'Brien XM, Chen Y, Reichner JS, Ayala A. Cl-Amidine Prevents Histone 3 Citrullination and Neutrophil Extracellular Trap Formation, and Improves Survival in a Murine Sepsis Model. J Innate Immun 2016; 9:22-32. [PMID: 27622642 DOI: 10.1159/000448808] [Citation(s) in RCA: 110] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 08/02/2016] [Indexed: 01/24/2023] Open
Abstract
Sepsis refers to the presence of a serious infection that correlates with systemic and uncontrolled immune activation. Posttranslational histone modification plays an important role in chromatin decondensation, which is regulated by citrullination. Citrullinated histone H3 (H3cit) has been identified as a component of neutrophil extracellular traps (NETs), which are released into the extracellular space as part of the neutrophil response to infection. The conversion of arginine to citrulline residues on histones is catalyzed by peptidylarginine deiminase 4 (PAD4). This study's goals were to characterize the presence of PAD4-catalyzed H3cit and NET formation during the onset of sepsis and elucidate the effects on the immune response when this mechanism of action is blocked. Adult C57BL/6 male mice were treated with Cl-amidine, an inhibitor of PAD4, 1 h prior to sepsis induced by cecal ligation and puncture (CLP). Twenty-four hours after CLP, cytokine levels, H3cit protein expression, neutrophil counts, and NET production were evaluated in the peritoneal cavity. Survival studies were also performed. Here we demonstrate that Cl-amidine treatment prior to CLP improves overall survival in sepsis and the abrogation of PAD4 has minimal effects on the proinflammatory immune response to sepsis, while it has no effect on overall neutrophil migration to the peritoneum.
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Affiliation(s)
- Bethany M Biron
- Division of Surgical Research, Department of Surgery, Rhode Island Hospital, Brown University, Providence, R.I., USA
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Muller S, Radic M. Citrullinated Autoantigens: From Diagnostic Markers to Pathogenetic Mechanisms. Clin Rev Allergy Immunol 2016; 49:232-9. [PMID: 25355199 DOI: 10.1007/s12016-014-8459-2] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The conversion of an arginine residue in a protein to a citrulline residue, a reaction carried out by enzymes called peptidylarginine deiminases (PADs), is rather subtle. One of the terminal imide groups in arginine is replaced by oxygen in citrulline, thus resulting in the loss of positive charge and the gain of 1 dalton. This post-translational modification by PAD enzymes is conserved in vertebrates and affects specific substrates during development and in various mature cell lineages. Citrullination offers a unique perspective on autoimmunity because PAD activity is stringently regulated, yet autoantibodies to citrullinated proteins predictably arise. Autoantigens recognized by anti-citrullinated protein antibodies (ACPA) include extracellular proteins such as filaggrin, collagen II, fibrinogen, and calreticulin; membrane-associated proteins such as myelin basic protein; cytoplasmic proteins such as vimentin and enolase; and even nuclear proteins such as histones. Some ACPA are remarkably effective as diagnostics in autoimmune disorders, most notably rheumatoid arthritis (RA). Several ACPA can be observed before other clinical RA manifestations are apparent. In patients with RA, ACPA may attain a sensitivity that exceeds 70 % and specificity that approaches 96-98 %. The biological context that may account for the induction of ACPA emerges from studies of the cellular response of the innate immune system to acute or chronic stimuli. In response to infections or inflammation, neutrophil granulocytes activate PAD, citrullinate multiple autoantigens, and expel chromatin from the cell. The externalized chromatin is called a neutrophil extracellular "trap" (NET). Citrullination of core and linker histones occurs prior to the release of chromatin from neutrophils, thus implicating the regulation of citrullinated chromatin release in the development of autoreactivity. The citrullination of extracellular autoantigens likely follows the release of NETs and associated PADs. Autoantibodies to citrullinated histones arise in RA, systemic lupus erythematosus, and Felty's syndrome patients. The citrullination of linker histone H1 may play a key role in NET release because the H1 histone regulates the entry and exit of DNA from the nucleosome. Juxtaposition of citrullinated histones with infectious pathogens and complement and immune complexes may compromise tolerance of nuclear autoantigens and promote autoimmunity.
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Affiliation(s)
- Sylviane Muller
- Immunopathology and Therapeutic Chemistry/Laboratory of Excellence MEDALIS, CNRS, Institut de Biologie Moléculaire et Cellulaire, Strasbourg, France
| | - Marko Radic
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN, USA.
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109
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NETosis markers: Quest for specific, objective, and quantitative markers. Clin Chim Acta 2016; 459:89-93. [DOI: 10.1016/j.cca.2016.05.029] [Citation(s) in RCA: 125] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 05/24/2016] [Accepted: 05/30/2016] [Indexed: 01/13/2023]
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110
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Bawadekar M, Gendron-Fitzpatrick A, Rebernick R, Shim D, Warner TF, Nicholas AP, Lundblad LKA, Thompson PR, Shelef MA. Tumor necrosis factor alpha, citrullination, and peptidylarginine deiminase 4 in lung and joint inflammation. Arthritis Res Ther 2016; 18:173. [PMID: 27450561 PMCID: PMC4957385 DOI: 10.1186/s13075-016-1068-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Accepted: 06/29/2016] [Indexed: 01/08/2023] Open
Abstract
Background The relationship between lung and joint inflammation in rheumatoid arthritis is poorly understood. Lung inflammation with resultant protein citrullination may trigger anti-citrullinated protein antibodies, inflammation, and arthritis. Alternatively, lung and joint inflammation may be two manifestations of a single underlying pathology. The lung has increased citrullination and TNF-α levels are high in rheumatoid arthritis; however, it is unknown if TNF-α can induce lung protein citrullination. The citrullinating enzyme peptidylarginine deiminase 4 (PAD4) exacerbates TNF-α-induced arthritis, but a role for PAD4 in lung citrullination and TNF-α-induced lung inflammation has not been explored. Our aim was to use TNF-α-overexpressing mice to clarify the intersection of TNF-α, citrullination, PAD4, arthritis, and lung inflammation. Methods Lung protein citrullination in wild-type mice, mice that overexpress TNF-α systemically (TNF+), TNF+PAD4+/+, and TNF+PAD4-/- mice was quantified by both gel electrophoresis using a citrulline probe and western blot. Hematoxylin and eosin (H&E)-stained lung sections from TNF+PAD4+/+ and TNF+PAD4-/- mice were scored for lung inflammation. H&E-stained ankle joint sections from mice that overexpress TNF-α only in the lungs were assessed for arthritis. Results TNF+ mice have increased lung protein citrullination. TNF+PAD4-/- mice do not have significantly reduced lung protein citrullination, but do have decreased lung inflammation compared to TNF+PAD4+/+ mice. Mice that overexpress TNF-α only in the lungs do not develop arthritis. Conclusions PAD4 exacerbates lung inflammation downstream of TNF-α without having a major role in generalized protein citrullination in inflamed lungs. Also, TNF-α-induced lung inflammation is not sufficient to drive murine arthritis. Electronic supplementary material The online version of this article (doi:10.1186/s13075-016-1068-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Mandar Bawadekar
- Department of Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Annette Gendron-Fitzpatrick
- Research Animal Resource Center Comparative Pathology Lab and Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Ryan Rebernick
- Department of Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Daeun Shim
- Department of Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Thomas F Warner
- Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, Madison, WI, USA
| | - Anthony P Nicholas
- Department of Neurology and Center for Neurodegeneration and Experimental Therapeutics, University of Alabama at Birmingham and Birmingham VA Medical Center, Birmingham, AL, USA
| | | | - Paul R Thompson
- Departments of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA, USA
| | - Miriam A Shelef
- Department of Medicine, University of Wisconsin-Madison and William S. Middleton Memorial Veterans Hospital, Madison, WI, USA.
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iPAD or PADi-'tablets' with therapeutic disease potential? Curr Opin Chem Biol 2016; 33:169-78. [PMID: 27372273 DOI: 10.1016/j.cbpa.2016.06.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 06/07/2016] [Accepted: 06/17/2016] [Indexed: 12/30/2022]
Abstract
Over the last five years, a growing body of literature has strengthened the rationale for the involvement of PAD (protein arginine deiminase) enzymes in diverse diseases, through direct roles of citrullination in mechanisms such as neutrophil extracellular trap formation and immune complex formation. The recent development of inhibitors of the PAD family, coupled with the availability of mice genetically deficient in PAD2 or PAD4, has accelerated understanding of the role of these targets in varied disease models. This review surveys the recent literature to confirm the therapeutic potential of PAD inhibitors as a new class of drugs to treat human autoimmune disease.
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Cantariño N, Musulén E, Valero V, Peinado MA, Perucho M, Moreno V, Forcales SV, Douet J, Buschbeck M. Downregulation of the Deiminase PADI2 Is an Early Event in Colorectal Carcinogenesis and Indicates Poor Prognosis. Mol Cancer Res 2016; 14:841-8. [PMID: 27280713 DOI: 10.1158/1541-7786.mcr-16-0034] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 05/23/2016] [Indexed: 11/16/2022]
Abstract
UNLABELLED Peptidyl arginine deiminases (PADI) are a family of enzymes that catalyze the poorly understood posttranslational modification converting arginine residues into citrullines. In this study, the role of PADIs in the pathogenesis of colorectal cancer was investigated. Specifically, RNA expression was analyzed and its association with survival in a cohort of 98 colorectal cancer patient specimens with matched adjacent mucosa and 50 controls from donors without cancer. Key results were validated in an independent collection of tumors with matched adjacent mucosa and by mining of a publicly available expression data set. Protein expression was analyzed by immunoblotting for cell lines or IHC for patient specimens that further included 24 cases of adenocarcinoma with adjacent dysplasia and 11 cases of active ulcerative colitis. The data indicate that PADI2 is the dominantly expressed PADI enzyme in colon mucosa and is upregulated during differentiation. PADI2 expression is low or absent in colorectal cancer. Frequently, this occurs already at the stage of low-grade dysplasia. Mucosal PADI2 expression is also low in ulcerative colitis. The expression level of PADI2 in tumor and adjacent mucosa correlates with differential survival: low levels associate with poor prognosis. IMPLICATIONS Downregulation of PADI2 is an early event in the pathogenesis of colorectal cancer associated with poor prognosis and points toward a possible role of citrullination in modulating tumor cells and their microenvironment. Mol Cancer Res; 14(9); 841-8. ©2016 AACR.
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Affiliation(s)
- Neus Cantariño
- Institute of Predictive and Personalized Medicine of Cancer (IMPPC), Campus Can Ruti, Badalona, Spain
| | - Eva Musulén
- Department of Pathology, Hospital Universitari Germans Trias i Pujol (HGTP), Campus Can Ruti, Badalona, Spain
| | - Vanesa Valero
- Institute of Predictive and Personalized Medicine of Cancer (IMPPC), Campus Can Ruti, Badalona, Spain. Josep Carreras Leukaemia Research Institute (IJC), Campus ICO-Germans Trias i Pujol, Campus Can Ruti, Badalona, Spain
| | - Miquel Angel Peinado
- Institute of Predictive and Personalized Medicine of Cancer (IMPPC), Campus Can Ruti, Badalona, Spain
| | - Manuel Perucho
- Institute of Predictive and Personalized Medicine of Cancer (IMPPC), Campus Can Ruti, Badalona, Spain
| | - Victor Moreno
- Cancer Prevention and Control Program, Catalan Institute of Oncology (ICO), Bellvitge Biomedical Research Institute (IDIBELL) and CIBERESP, Barcelona, Spain. Department of Clinical Sciences, Faculty of Medicine, University of Barcelona (UB), Barcelona, Spain
| | - Sònia-Vanina Forcales
- Institute of Predictive and Personalized Medicine of Cancer (IMPPC), Campus Can Ruti, Badalona, Spain
| | - Julien Douet
- Institute of Predictive and Personalized Medicine of Cancer (IMPPC), Campus Can Ruti, Badalona, Spain. Josep Carreras Leukaemia Research Institute (IJC), Campus ICO-Germans Trias i Pujol, Campus Can Ruti, Badalona, Spain
| | - Marcus Buschbeck
- Institute of Predictive and Personalized Medicine of Cancer (IMPPC), Campus Can Ruti, Badalona, Spain. Josep Carreras Leukaemia Research Institute (IJC), Campus ICO-Germans Trias i Pujol, Campus Can Ruti, Badalona, Spain.
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113
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Kusunoki Y, Nakazawa D, Shida H, Hattanda F, Miyoshi A, Masuda S, Nishio S, Tomaru U, Atsumi T, Ishizu A. Peptidylarginine Deiminase Inhibitor Suppresses Neutrophil Extracellular Trap Formation and MPO-ANCA Production. Front Immunol 2016; 7:227. [PMID: 27375623 PMCID: PMC4896908 DOI: 10.3389/fimmu.2016.00227] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 05/26/2016] [Indexed: 01/13/2023] Open
Abstract
Myeloperoxidase-antineutrophil cytoplasmic antibody (MPO-ANCA)-associated vasculitis is a systemic small-vessel vasculitis, wherein, MPO-ANCA plays a critical role in the pathogenesis. Neutrophil extracellular traps (NETs) released from activated neutrophils are composed of extracellular web-like DNA and antimicrobial proteins, including MPO. Diverse stimuli, such as phorbol myristate acetate (PMA) and ligands of toll-like receptors (TLR), induce NETs. Although TLR-mediated NET formation can occur with preservation of living neutrophilic functions (called vital NETosis), PMA-stimulated neutrophils undergo cell death with NET formation (called suicidal NETosis). In the process of suicidal NETosis, histones are citrullinated by peptidylarginine deiminase 4 (PAD4). Since this step is necessary for decondensation of DNA, PAD4 plays a pivotal role in suicidal NETosis. Although NETs are essential for elimination of microorganisms, excessive formation of NETs has been suggested to be implicated in MPO-ANCA production. This study aimed to determine if pan-PAD inhibitors could suppress MPO-ANCA production in vivo. At first, NETs were induced in peripheral blood neutrophils derived from healthy donors (1 × 106/ml) by stimulation with 20 nM PMA with or without 20 μM propylthiouracil (PTU), an anti-thyroid drug. We then determined that the in vitro NET formation was inhibited completely by 200 μM Cl-amidine, a pan-PAD inhibitor. Next, we established mouse models with MPO-ANCA production. BALB/c mice were given intraperitoneal (i.p.) injection of PMA (50 ng at days 0 and 7) and oral PTU (2.5 mg/day) for 2 weeks. These mice were divided into two groups; the first group was given daily i.p. injection of PBS (200 μl/day) (n = 13) and the other group with daily i.p. injection of Cl-amidine (0.3 mg/200 μl PBS/day) (n = 7). Two weeks later, citrullination as an indicator of NET formation in the peritoneum and serum MPO-ANCA titer was compared between the two groups. Results demonstrated that citrullination in the peritoneum was significantly reduced in the Cl-amidine-treated mice compared with the vehicle-injected control mice (38% reduction). Additionally, the serum MPO-ANCA titer of the Cl-amidine-treated mice (32.3 ± 31.0 ng/ml) was significantly lower than that in the vehicle-injected mice (132.1 ± 41.6 ng/ml). The collective findings indicate that excessive formation of NETs may be implicated in MPO-ANCA production in vivo.
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Affiliation(s)
- Yoshihiro Kusunoki
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Daigo Nakazawa
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Haruki Shida
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Fumihiko Hattanda
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Arina Miyoshi
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Sakiko Masuda
- Faculty of Health Sciences, Hokkaido University , Sapporo , Japan
| | - Saori Nishio
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Utano Tomaru
- Department of Pathology, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Tatsuya Atsumi
- Division of Rheumatology, Endocrinology and Nephrology, Hokkaido University Graduate School of Medicine , Sapporo , Japan
| | - Akihiro Ishizu
- Faculty of Health Sciences, Hokkaido University , Sapporo , Japan
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Witalison EE, Thompson PR, Hofseth LJ. Protein Arginine Deiminases and Associated Citrullination: Physiological Functions and Diseases Associated with Dysregulation. Curr Drug Targets 2016; 16:700-10. [PMID: 25642720 DOI: 10.2174/1389450116666150202160954] [Citation(s) in RCA: 210] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 01/24/2015] [Indexed: 11/22/2022]
Abstract
Human proteins are subjected to more than 200 known post-translational modifications (PTMs) (e.g., phosphorylation, glycosylation, ubiquitination, S-nitrosylation, methylation, Nacetylation, and citrullination) and these PTMs can alter protein structure and function with consequent effects on the multitude of pathways necessary for maintaining the physiological homeostasis. When dysregulated, however, the enzymes that catalyze these PTMs can impact the genesis of countless diseases. In this review, we will focus on protein citrullination, a PTM catalyzed by the Protein Arginine Deiminase (PAD) family of enzymes. Specifically, we will describe the roles of the PADs in both normal human physiology and disease. The development of PAD inhibitors and their efficacy in a variety of autoimmune disorders and cancer will also be discussed.
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Affiliation(s)
| | | | - Lorne J Hofseth
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy 770 Sumter St., Coker Life Sciences, Rm. 513C University of South Carolina Columbia, SC 29208.
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115
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Kawalkowska J, Quirke AM, Ghari F, Davis S, Subramanian V, Thompson PR, Williams RO, Fischer R, La Thangue NB, Venables PJ. Abrogation of collagen-induced arthritis by a peptidyl arginine deiminase inhibitor is associated with modulation of T cell-mediated immune responses. Sci Rep 2016; 6:26430. [PMID: 27210478 PMCID: PMC4876390 DOI: 10.1038/srep26430] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 05/03/2016] [Indexed: 12/15/2022] Open
Abstract
Proteins containing citrulline, a post-translational modification of arginine, are generated by peptidyl arginine deiminases (PAD). Citrullinated proteins have pro-inflammatory effects in both innate and adaptive immune responses. Here, we examine the therapeutic effects in collagen-induced arthritis of the second generation PAD inhibitor, BB-Cl-amidine. Treatment after disease onset resulted in the reversal of clinical and histological changes of arthritis, associated with a marked reduction in citrullinated proteins in lymph nodes. There was little overall change in antibodies to collagen or antibodies to citrullinated peptides, but a shift from pro-inflammatory Th1 and Th17-type responses to pro-resolution Th2-type responses was demonstrated by serum cytokines and antibody subtypes. In lymph node cells from the arthritic mice treated with BB-Cl-amidine, there was a decrease in total cell numbers but an increase in the proportion of Th2 cells. BB-Cl-amidine had a pro-apoptotic effect on all Th subsets in vitro with Th17 cells appearing to be the most sensitive. We suggest that these immunoregulatory effects of PAD inhibition in CIA are complex, but primarily mediated by transcriptional regulation. We suggest that targeting PADs is a promising strategy for the treatment of chronic inflammatory disease.
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Affiliation(s)
- Joanna Kawalkowska
- Kennedy Institute, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Roosevelt Drive, Oxford OX3 7FY, UK
| | - Anne-Marie Quirke
- Kennedy Institute, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Roosevelt Drive, Oxford OX3 7FY, UK
| | - Fatemeh Ghari
- Laboratory of Cancer Biology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford OX3 7DQ, UK
| | - Simon Davis
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7FZ, UK
| | - Venkataraman Subramanian
- Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, LRB 826, 364 Plantation Street, Worcester, MA, 01605, USA
| | - Paul R. Thompson
- Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, LRB 826, 364 Plantation Street, Worcester, MA, 01605, USA
| | - Richard O. Williams
- Kennedy Institute, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Roosevelt Drive, Oxford OX3 7FY, UK
| | - Roman Fischer
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7FZ, UK
| | - Nicholas B. La Thangue
- Laboratory of Cancer Biology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford OX3 7DQ, UK
| | - Patrick J. Venables
- Kennedy Institute, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Roosevelt Drive, Oxford OX3 7FY, UK
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116
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Decreased severity of experimental autoimmune arthritis in peptidylarginine deiminase type 4 knockout mice. BMC Musculoskelet Disord 2016; 17:205. [PMID: 27150598 PMCID: PMC4858923 DOI: 10.1186/s12891-016-1055-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 08/10/2015] [Indexed: 02/05/2023] Open
Abstract
Background Peptidylarginine deiminase type 4 (PADI4) has been identified as a susceptibility gene for rheumatoid arthritis (RA) by genome-wide association studies. PADI4 is highly expressed in the bone marrow, macrophages, neutrophils, and monocytes. Peptidyl citrulline is an interesting molecule in RA because it is a target antigen for anti-citrullinated peptide antibodies, and only PADs (translated proteins from PADI genes) can provide peptidyl citrulline via the modification of protein substrates. The aim of this study was to evaluate the importance of the PADI4 gene in the progression of RA. Methods We generated Padi4 knockout (Padi4−/−) DBA1J mice. The Padi4−/− DBA1J and wild-type mice were immunized with bovine type II collagen (CII) to develop collagen-induced arthritis (CIA). The expression of various inflammatory cytokines and Padi genes in immune cells was detected by the real-time TaqMan assay. Cytokine concentrations in sera were measured by enzyme-linked immunosorbent assays. Localization of the PAD4 and PAD2 proteins was indicated by immunohistochemistry. Results We demonstrated that the clinical disease score was significantly decreased in the Padi4−/− mice and Padi4 expression was induced by CII immunization. In the Padi4−/− mice, serum anti-type II collagen (CII) immunoglobulin M (IgM), IgG, and inflammatory cytokine levels were significantly decreased compared with those in the wild-type mice. Padi2 expression was induced in the immune cells of the Padi4−/− mice as a compensation for the defect in Padi4. Conclusions Padi4 affected disease severity in the CIA mice and was involved in the enhancement of the collagen-initiated inflammatory responses. Electronic supplementary material The online version of this article (doi:10.1186/s12891-016-1055-2) contains supplementary material, which is available to authorized users.
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Abstract
The post-translational modification of arginine residues represents a key mechanism for the epigenetic control of gene expression. Aberrant levels of histone arginine modifications have been linked to the development of several diseases including cancer. In recent years, great progress has been made in understanding the physiological role of individual arginine modifications and their effects on chromatin function. The present review aims to summarize the structural and functional aspects of histone arginine modifying enzymes and their impact on gene transcription. We will discuss the potential for targeting these proteins with small molecules in a variety of disease states.
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Affiliation(s)
- Jakob Fuhrmann
- Department
of Chemistry, The Scripps Research Institute, 130 Scripps Way, Jupiter, Florida 33458, United States
| | - Paul R. Thompson
- Department
of Biochemistry and Molecular Pharmacology, UMass Medical School, 364 Plantation Street, Worcester, Massachusetts 01605, United States
- Program
in Chemical Biology, UMass Medical School, 364 Plantation Street, Worcester, Massachusetts 01605, United States
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118
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Bicker KL, Thompson PR. The protein arginine deiminases: Structure, function, inhibition, and disease. Biopolymers 2016; 99:155-63. [PMID: 23175390 DOI: 10.1002/bip.22127] [Citation(s) in RCA: 168] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Revised: 06/24/2012] [Accepted: 07/06/2012] [Indexed: 12/11/2022]
Abstract
The post-translational modification of histones has significant effects on overall chromatin function. One such modification is citrullination, which is catalyzed by the protein arginine deiminases (PADs), a unique family of enzymes that catalyzes the hydrolysis of peptidyl-arginine to form peptidyl-citrulline on histones, fibrinogen, and other biologically relevant proteins. Overexpression and/or increased PAD activity is observed in several diseases, including rheumatoid arthritis, Alzheimer's disease, multiple sclerosis, lupus, Parkinson's disease, and cancer. This review discusses the important structural and mechanistic characteristics of the PADs, as well as recent investigations into the role of the PADs in increasing disease severity in RA and colitis and the importance of PAD activity in mediating neutrophil extracellular trap formation through chromatin decondensation. Lastly, efforts to develop PAD inhibitors with excellent potency, selectivity and in vivo efficacy are discussed, highlighting the most promising inhibitors.
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Affiliation(s)
- Kevin L Bicker
- Department of Chemistry, The Scripps Research Institute, Scripps Florida, 120 Scripps Way, Jupiter, FL 33458
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119
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Peptidylarginine Deiminase 3 (PAD3) Is Upregulated by Prolactin Stimulation of CID-9 Cells and Expressed in the Lactating Mouse Mammary Gland. PLoS One 2016; 11:e0147503. [PMID: 26799659 PMCID: PMC4723263 DOI: 10.1371/journal.pone.0147503] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 01/05/2016] [Indexed: 12/13/2022] Open
Abstract
Peptidylarginine deiminases (PADs) post-translationally convert arginine into neutral citrulline residues. Our past work shows that PADs are expressed in the canine and murine mammary glands; however, the mechanisms regulating PAD expression and the function of citrullination in the normal mammary gland are unclear. Therefore, the first objective herein was to investigate regulation of PAD expression in mammary epithelial cells. We first examined PAD levels in CID-9 cells, which were derived from the mammary gland of mid-pregnant mice. PAD3 expression is significantly higher than all other PAD isoforms and mediates protein citrullination in CID-9 cells. We next hypothesized that prolactin regulates PAD3 expression. To test this, CID-9 cells were stimulated with 5 μg/mL of prolactin for 48 hours which significantly increases PAD3 mRNA and protein expression. Use of a JAK2 inhibitor and a dominant negative (DN)-STAT5 adenovirus indicate that prolactin stimulation of PAD3 expression is mediated by the JAK2/STAT5 signaling pathway in CID-9 cells. In addition, the human PAD3 gene promoter is prolactin responsive in CID-9 cells. Our second objective was to investigate the expression and activity of PAD3 in the lactating mouse mammary gland. PAD3 expression in the mammary gland is highest on lactation day 9 and coincident with citrullinated proteins such as histones. Use of the PAD3 specific inhibitor, Cl4-amidine, indicates that PAD3, in part, can citrullinate proteins in L9 mammary glands. Collectively, our results show that upregulation of PAD3 is mediated by prolactin induction of the JAK2/STAT5 signaling pathway, and that PAD3 appears to citrullinate proteins during lactation.
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120
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Blachère NE, Parveen S, Fak J, Frank MO, Orange DE. Inflammatory but not apoptotic death of granulocytes citrullinates fibrinogen. Arthritis Res Ther 2015; 17:369. [PMID: 26684871 PMCID: PMC4704541 DOI: 10.1186/s13075-015-0890-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 12/08/2015] [Indexed: 12/16/2022] Open
Abstract
Background Neutrophil activation induces citrullination of intracellular targets of anticitrullinated peptide antibodies (ACPA), which are specific for rheumatoid arthritis (RA). Citrullinated fibrinogen is bound by ACPA but it is less well understood how extracellular proteins are citrullinated. The cells that produce fibrinogen, hepatocytes, do not express peptidyl arginine deiminase (PAD) enzymes nor do PAD enzymes include N-terminal signal peptides to direct them into the secretory pathway. We hypothesized that dying neutrophils release PAD in the extracellular space, and that this could cause citrullination of target extracellular antigens relevant to RA such as fibrinogen. Methods HL60 cells were differentiated into neutrophil-like cells by treatment with all-trans retinoic acid (ATRA). Differentiation was confirmed by CD11b staining, PAD4, PAD2 and myeloperoxidase expression, cell division, and nuclear morphology. Death was induced with various stimuli, including freeze-thaw to induce necrosis, Ionomycin and PMA to induce NETosis, and UV-B to induce apoptosis. Death markers were assessed by immunohistochemistry and flow cytometry. To quantify extracellular citrullination, dying ATRA-differentiated HL60 cells were cultured with fibrinogen for 24 hours and supernatants were probed for fibrinogen citrullination, PAD2 and PAD4 by western blot. Results While both NETotic and necrotic ATRA differentiated HL60 cells citrullinated fibrinogen, apoptotic cells did not citrullinate fibrinogen, even when allowed to undergo secondary necrosis. Incubation of necrotic neutrophil lysates with fibrinogen also causes fibrinogen citrullination. PAD2 and PAD4 were detected by western blot of supernatants of ATRA-differentiated HL60 cells undergoing necrotic and NETotic death, but not apoptotic or secondarily necrotic cell death. Conclusion We implicate granulocytes undergoing inflammatory cell death as a mechanism for altering extracellular self-proteins that may be targets of autoimmunity linked to inflammatory diseases such as rheumatoid arthritis. Electronic supplementary material The online version of this article (doi:10.1186/s13075-015-0890-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Nathalie E Blachère
- Laboratory of Neuro-Oncology, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, USA. .,Howard Hughes Medical Institute, New York, New York, 10065, USA.
| | - Salina Parveen
- Laboratory of Neuro-Oncology, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, USA.
| | - John Fak
- Laboratory of Neuro-Oncology, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, USA.
| | - Mayu O Frank
- Laboratory of Neuro-Oncology, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, USA. .,New York Genome Center, 101 Avenue of the Americas, New York, NY, 10013, USA.
| | - Dana E Orange
- Laboratory of Neuro-Oncology, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, USA. .,Division of Rheumatology, Hospital for Special Surgery, New York, NY, 10021, USA. .,New York Genome Center, 101 Avenue of the Americas, New York, NY, 10013, USA.
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121
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Lewallen DM, Bicker KL, Subramanian V, Clancy KW, Slade DJ, Martell J, Dreyton CJ, Sokolove J, Weerapana E, Thompson PR. Chemical Proteomic Platform To Identify Citrullinated Proteins. ACS Chem Biol 2015; 10:2520-8. [PMID: 26360112 PMCID: PMC4729336 DOI: 10.1021/acschembio.5b00438] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Anti-citrullinated protein antibodies (ACPAs) are a hallmark of rheumatoid arthritis (RA) and are routinely used for disease diagnosis. Protein citrullination is also increased in cancer and other autoimmune disorders, suggesting that citrullinated proteins may serve as biomarkers for diseases beyond RA. To identify these citrullinated proteins, we developed biotin-conjugated phenylglyoxal (biotin-PG). Using this probe and our platform technology, we identified >50 intracellular citrullinated proteins. More than 20 of these are involved in RNA splicing, suggesting, for the first time, that citrullination modulates RNA biology. Overall, this chemical proteomic platform will play a key role in furthering our understanding of protein citrullination in rheumatoid arthritis and potentially a wider spectrum of inflammatory diseases.
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Affiliation(s)
| | | | - Venkataraman Subramanian
- Department
of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, United States
| | - Kathleen W. Clancy
- Department
of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, United States
| | | | - Julianne Martell
- Department
of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Christina J. Dreyton
- Department
of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, United States
| | - Jeremy Sokolove
- Division
of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine, Stanford, California 94305, United States
| | - Eranthie Weerapana
- Department
of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Paul R. Thompson
- Department
of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, United States
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122
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Detection and identification of protein citrullination in complex biological systems. Curr Opin Chem Biol 2015; 30:1-6. [PMID: 26517730 DOI: 10.1016/j.cbpa.2015.10.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 10/11/2015] [Indexed: 11/21/2022]
Abstract
Protein citrullination is a post-translational modification of arginine that is catalyzed by the Protein Arginine Deiminase (PAD) family of enzymes. Aberrantly increased citrullination is associated with a host of inflammatory diseases and cancer and PAD inhibitors have shown remarkable efficacy in a range of diseases including rheumatoid arthritis, lupus, atherosclerosis, and ulcerative colitis. In rheumatoid arthritis, citrullinated proteins serve as key antigens for rheumatoid arthritis-associated autoantibodies. These data suggest that citrullinated proteins may serve more generally as biomarkers of specific disease states, however, the identification of citrullinated residues remains challenging due to the small 1Da mass change that occurs upon citrullination. Herein, we highlight the available techniques to identify citrullinated proteins/residues focusing on advanced MS techniques as well as chemical derivatization strategies that are currently being employed to identify citrullinated proteins as well as the specific residues modified within those proteins.
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123
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Maezawa Y, Paltser G, Tsui H, Cheung R, Wu P, Nicholas AP, Dosch HM. 2-Chloroacetamidine, a novel immunomodulator, suppresses antigen-induced mouse airway inflammation. Allergy 2015; 70:1130-8. [PMID: 25969859 DOI: 10.1111/all.12651] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/09/2015] [Indexed: 11/28/2022]
Abstract
BACKGROUND Citrullination is a presently under-recognized posttranslational protein modification catalyzed by PAD enzymes. Immune responses to citrullinated neo-epitopes are identified in a growing number of inflammatory and autoimmune diseases. However, the involvement of hypercitrullination in the pathogenesis of bronchial asthma is still unknown. METHODS As main experimental tool, we examined the effect of 2-chloroacetamidine (2CA), a PAD enzyme inhibitor, on OVA-immunized and airway-challenged BALB/c mice; a commonly used model of allergic airway inflammation. We also measured the effect of 2CA on ex vivo lymphocytes and cell lines. RESULTS In vivo, 2CA dramatically suppressed lung tissue hypercitrullination, inflammatory cell recruitment, and airway-Th2 cytokine secretion. 2CA also suppressed systemic OVA-specific and total IgE production dramatically, effectively preventing de novo and diminishing established disease without measurably impacting general immunocompetence. In vitro, 2CA markedly inhibited the proliferation of mouse and human T cells with cell cycle block and apoptosis during a limited, postactivation phase. CONCLUSIONS 2CA acts as narrow-spectrum immunosuppressant that selectively targets lymphocyte populations involved in active inflammatory tissue lesions. If hypercitrullination is generated in patients with asthma, 2CA may represent a novel disease modulator for human asthmatics/allergic diseases.
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Affiliation(s)
- Y. Maezawa
- The Hospital for Sick Children Research Institute; Neuroscience and Mental Health; University of Toronto; Toronto ON Canada
| | - G. Paltser
- The Hospital for Sick Children Research Institute; Neuroscience and Mental Health; University of Toronto; Toronto ON Canada
| | - H. Tsui
- The Hospital for Sick Children Research Institute; Neuroscience and Mental Health; University of Toronto; Toronto ON Canada
| | - R. Cheung
- The Hospital for Sick Children Research Institute; Neuroscience and Mental Health; University of Toronto; Toronto ON Canada
| | - P. Wu
- The Hospital for Sick Children Research Institute; Neuroscience and Mental Health; University of Toronto; Toronto ON Canada
| | - A. P. Nicholas
- Department of Neurology and Center for Neuroimmunology; University of Alabama at Birmingham; Birmingham AL USA
- Birmingham VA Medical Center; Birmingham AL USA
| | - H.-M. Dosch
- The Hospital for Sick Children Research Institute; Neuroscience and Mental Health; University of Toronto; Toronto ON Canada
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124
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Fuhrmann J, Clancy K, Thompson PR. Chemical biology of protein arginine modifications in epigenetic regulation. Chem Rev 2015; 115:5413-61. [PMID: 25970731 PMCID: PMC4463550 DOI: 10.1021/acs.chemrev.5b00003] [Citation(s) in RCA: 204] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2015] [Indexed: 01/10/2023]
Affiliation(s)
- Jakob Fuhrmann
- Department
of Chemistry, The Scripps Research Institute, 130 Scripps Way, Jupiter, Florida 33458, United States
| | - Kathleen
W. Clancy
- Department of Biochemistry and Molecular Pharmacology and Program in Chemical
Biology, University of Massachusetts Medical
School, 364 Plantation
Street, Worcester, Massachusetts 01605, United States
| | - Paul R. Thompson
- Department of Biochemistry and Molecular Pharmacology and Program in Chemical
Biology, University of Massachusetts Medical
School, 364 Plantation
Street, Worcester, Massachusetts 01605, United States
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125
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Slade DJ, Fang P, Dreyton CJ, Zhang Y, Fuhrmann J, Rempel D, Bax BD, Coonrod SA, Lewis HD, Guo M, Gross ML, Thompson PR. Protein arginine deiminase 2 binds calcium in an ordered fashion: implications for inhibitor design. ACS Chem Biol 2015; 10:1043-53. [PMID: 25621824 PMCID: PMC4569063 DOI: 10.1021/cb500933j] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
![]()
Protein
arginine deiminases (PADs) are calcium-dependent histone-modifying
enzymes whose activity is dysregulated in inflammatory diseases and
cancer. PAD2 functions as an Estrogen Receptor (ER) coactivator in
breast cancer cells via the citrullination of histone tail arginine
residues at ER binding sites. Although an attractive therapeutic target,
the mechanisms that regulate PAD2 activity are largely unknown, especially
the detailed role of how calcium facilitates enzyme activation. To
gain insights into these regulatory processes, we determined the first
structures of PAD2 (27 in total), and through calcium-titrations by
X-ray crystallography, determined the order of binding and affinity
for the six calcium ions that bind and activate this enzyme. These
structures also identified several PAD2 regulatory elements, including
a calcium switch that controls proper positioning of the catalytic
cysteine residue, and a novel active site shielding mechanism. Additional
biochemical and mass-spectrometry-based hydrogen/deuterium exchange
studies support these structural findings. The identification of multiple
intermediate calcium-bound structures along the PAD2 activation pathway
provides critical insights that will aid the development of allosteric
inhibitors targeting the PADs.
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Affiliation(s)
- Daniel J. Slade
- Department
of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, United States
- Department
of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, United States
| | - Pengfei Fang
- Department
of Cancer Biology, The Scripps Research Institute, Jupiter, Florida 33458, United States
| | - Christina J. Dreyton
- Department
of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, United States
- Department
of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, United States
| | - Ying Zhang
- Department
of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Jakob Fuhrmann
- Department
of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, United States
| | - Don Rempel
- Department
of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Benjamin D. Bax
- Molecular
Discovery Research, GlaxoSmithKline, Medicines Research Centre, Gunnels
Wood Road, Stevenage, Herts., SG1 2NY, United Kingdom
| | - Scott A. Coonrod
- Department
of Biomedical Sciences, Baker Institute for Animal Health, Cornell University, Ithaca, New York 14853, United States
| | - Huw D. Lewis
- EpiNova DPU,
Immuno-Inflammation Therapy Area, GlaxoSmithKline, Medicines Research Centre, Gunnels Wood Road, Stevenage, Herts., SG1 2NY, United Kingdom
| | - Min Guo
- Department
of Cancer Biology, The Scripps Research Institute, Jupiter, Florida 33458, United States
| | - Michael L. Gross
- Department
of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Paul R. Thompson
- Department
of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, United States
- Department
of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, United States
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126
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Boe DM, Curtis BJ, Chen MM, Ippolito JA, Kovacs EJ. Extracellular traps and macrophages: new roles for the versatile phagocyte. J Leukoc Biol 2015; 97:1023-35. [PMID: 25877927 DOI: 10.1189/jlb.4ri1014-521r] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 02/20/2015] [Indexed: 12/13/2022] Open
Abstract
MΦ are multipurpose phagocytes with a large repertoire of well-characterized abilities and functions, including regulation of inflammation, wound healing, maintenance of tissue homeostasis, as well as serving as an integral component of the innate-immune defense against microbial pathogens. Working along with neutrophils and dendritic cells, the other myeloid-derived professional phagocytes, MΦ are one of the key effector cells initiating and directing the host reaction to pathogenic organisms and resolving subsequent responses once the threat has been cleared. ETs are a relatively novel strategy of host defense involving expulsion of nuclear material and embedded proteins from immune cells to immobilize and kill bacteria, fungi, and viruses. As research on ETs expands, it has begun to encompass many immune cell types in unexpected ways, including various types of MΦ, which are not only capable of generating METs in response to various stimuli, but recent preclinical data suggest that they are an important agent in clearing ETs and limiting ET-mediated inflammation and tissue damage. This review aims to summarize historical and recent findings of biologic research regarding ET formation and function and discuss the role of MΦ in ET physiology and associated pathologies.
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Affiliation(s)
- Devin M Boe
- *Alcohol Research Program, Burn and Shock Trauma Research Institute, Department of Surgery, Loyola University Chicago Health Sciences Campus, Maywood, Illinois, USA
| | - Brenda J Curtis
- *Alcohol Research Program, Burn and Shock Trauma Research Institute, Department of Surgery, Loyola University Chicago Health Sciences Campus, Maywood, Illinois, USA
| | - Michael M Chen
- *Alcohol Research Program, Burn and Shock Trauma Research Institute, Department of Surgery, Loyola University Chicago Health Sciences Campus, Maywood, Illinois, USA
| | - Jill A Ippolito
- *Alcohol Research Program, Burn and Shock Trauma Research Institute, Department of Surgery, Loyola University Chicago Health Sciences Campus, Maywood, Illinois, USA
| | - Elizabeth J Kovacs
- *Alcohol Research Program, Burn and Shock Trauma Research Institute, Department of Surgery, Loyola University Chicago Health Sciences Campus, Maywood, Illinois, USA
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127
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Witalison EE, Cui X, Hofseth AB, Subramanian V, Causey CP, Thompson PR, Hofseth LJ. Inhibiting protein arginine deiminases has antioxidant consequences. J Pharmacol Exp Ther 2015; 353:64-70. [PMID: 25635139 DOI: 10.1124/jpet.115.222745] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Ulcerative colitis is a dynamic, idiopathic, chronic inflammatory condition that carries a high colon cancer risk. We previously showed that Cl-amidine, a small-molecule inhibitor of the protein arginine deiminases, suppresses colitis in mice. Because colitis is defined as inflammation of the colon associated with infiltration of white blood cells that release free radicals and citrullination is an inflammation-dependent process, we asked whether Cl-amidine has antioxidant properties. Here we show that colitis induced with azoxymethane via intraperitoneal injection + 2% dextran sulfate sodium in the drinking water is suppressed by Cl-amidine (also given in the drinking water). Inducible nitric oxide synthase, an inflammatory marker, was also downregulated in macrophages by Cl-amidine. Because epithelial cell DNA damage associated with colitis is at least in part a result of an oxidative burst from overactive leukocytes, we tested the hypothesis that Cl-amidine can inhibit leukocyte activation, as well as subsequent target epithelial cell DNA damage in vitro and in vivo. Results are consistent with this hypothesis, and because DNA damage is a procancerous mechanism, our data predict that Cl-amidine will not only suppress colitis, but we hypothesize that it may prevent colon cancer associated with colitis.
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Affiliation(s)
- Erin E Witalison
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina (E.E.W., X.C., A.B.H., L.J.H.); Shanxi Medical University, Taiyuan, Shanxi, China (X.C.); Department of Chemistry, The Scripps Research Institute, Scripps Florida, Jupiter, Florida (V.S.); Department of Chemistry, University of North Florida, Jacksonville, Florida (C.P.C.); and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts (P.R.T.)
| | - Xiangli Cui
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina (E.E.W., X.C., A.B.H., L.J.H.); Shanxi Medical University, Taiyuan, Shanxi, China (X.C.); Department of Chemistry, The Scripps Research Institute, Scripps Florida, Jupiter, Florida (V.S.); Department of Chemistry, University of North Florida, Jacksonville, Florida (C.P.C.); and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts (P.R.T.)
| | - Anne B Hofseth
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina (E.E.W., X.C., A.B.H., L.J.H.); Shanxi Medical University, Taiyuan, Shanxi, China (X.C.); Department of Chemistry, The Scripps Research Institute, Scripps Florida, Jupiter, Florida (V.S.); Department of Chemistry, University of North Florida, Jacksonville, Florida (C.P.C.); and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts (P.R.T.)
| | - Venkataraman Subramanian
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina (E.E.W., X.C., A.B.H., L.J.H.); Shanxi Medical University, Taiyuan, Shanxi, China (X.C.); Department of Chemistry, The Scripps Research Institute, Scripps Florida, Jupiter, Florida (V.S.); Department of Chemistry, University of North Florida, Jacksonville, Florida (C.P.C.); and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts (P.R.T.)
| | - Corey P Causey
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina (E.E.W., X.C., A.B.H., L.J.H.); Shanxi Medical University, Taiyuan, Shanxi, China (X.C.); Department of Chemistry, The Scripps Research Institute, Scripps Florida, Jupiter, Florida (V.S.); Department of Chemistry, University of North Florida, Jacksonville, Florida (C.P.C.); and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts (P.R.T.)
| | - Paul R Thompson
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina (E.E.W., X.C., A.B.H., L.J.H.); Shanxi Medical University, Taiyuan, Shanxi, China (X.C.); Department of Chemistry, The Scripps Research Institute, Scripps Florida, Jupiter, Florida (V.S.); Department of Chemistry, University of North Florida, Jacksonville, Florida (C.P.C.); and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts (P.R.T.)
| | - Lorne J Hofseth
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina (E.E.W., X.C., A.B.H., L.J.H.); Shanxi Medical University, Taiyuan, Shanxi, China (X.C.); Department of Chemistry, The Scripps Research Institute, Scripps Florida, Jupiter, Florida (V.S.); Department of Chemistry, University of North Florida, Jacksonville, Florida (C.P.C.); and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts (P.R.T.)
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128
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Subramanian V, Knight JS, Parelkar S, Anguish L, Coonrod SA, Kaplan MJ, Thompson PR. Design, synthesis, and biological evaluation of tetrazole analogs of Cl-amidine as protein arginine deiminase inhibitors. J Med Chem 2015; 58:1337-44. [PMID: 25559347 PMCID: PMC4610306 DOI: 10.1021/jm501636x] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
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Protein
arginine deiminases (PADs) catalyze the post-translational
hydrolysis of arginine residues to form citrulline. This once obscure
modification is now known to play a key role in the etiology of multiple
autoimmune diseases (e.g., rheumatoid arthritis, multiple sclerosis,
lupus, and ulcerative colitis) and in some forms of cancer. Among
the five human PADs (PAD1, -2, -3, -4, and -6), it is unclear which
isozyme contributes to disease pathogenesis. Toward the identification
of potent, selective, and bioavailable PAD inhibitors that can be
used to elucidate the specific roles of each isozyme, we describe
tetrazole analogs as suitable backbone amide bond bioisosteres for
the parent pan PAD inhibitor Cl-amidine. These tetrazole based analogs
are highly potent and show selectivity toward particular isozymes.
Importantly, one of the compounds, biphenyl tetrazole tert-butyl Cl-amidine (compound 13), exhibits enhanced cell
killing in a PAD4 expressing osteosarcoma bone marrow (U2OS) cell
line and can also block the formation of neutrophil extracellular
traps. These bioisosteres represent an important step in our efforts
to develop stable, bioavailable, and selective inhibitors for the
PADs.
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Affiliation(s)
- Venkataraman Subramanian
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School , 364 Plantation Street, Worcester, Massachusetts, 01605, United States
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129
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Gudmann NS, Hansen NUB, Jensen ACB, Karsdal MA, Siebuhr AS. Biological relevance of citrullinations: diagnostic, prognostic and therapeutic options. Autoimmunity 2014; 48:73-9. [PMID: 25520183 DOI: 10.3109/08916934.2014.962024] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
OBJECTIVE Citrullination has become a hot topic within recent years due to its involvement in diseases such as rheumatoid arthritis (RA), multiple sclerosis and fibrosis. Citrullinations are the conversion of arginine to citrulline by peptidylarginine deiminase (PAD) enzymes, which affect protein properties. The aim of this review is to summarize the advances in citrullination research and further explore the potential of citrullination as a diagnostic tool as well as inhibition of PAD enzymes as a target for treatment. METHOD We reviewed current literature with emphasis on the role of citrullination in health and disease, the nature of enzymes responsible for citrullination, and the potential of applying citrullinations in diagnostics and pharmaceuticals. CONCLUSION Current literature suggests that increased levels of citrullinated proteins are found in several if not all inflammatory diseases. In RA measurement of anti-citrullinated protein antibodies (ACPA) against citrullinated protein fragments are widely used as a prognostic biomarker. More recently, it has been indicated that levels of selected citrullinated proteins carries additional potential as biomarkers. This includes citrullinated vimentin which provide prognostic information in diseases as fibrosis and ankylosing spondylitis. In addition, recent studies suggest that inhibition of PAD is a target for treatment of diseases such as RA and cancer where proteins that are citrullinated are believed to influence the disease activity.
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130
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Jang B, Kim HW, Kim JS, Kim WS, Lee BR, Kim S, Kim H, Han SJ, Ha SJ, Shin SJ. Peptidylarginine deiminase inhibition impairs Toll-like receptor agonist-induced functional maturation of dendritic cells, resulting in the loss of T cell-proliferative capacity: a partial mechanism with therapeutic potential in inflammatory settings. J Leukoc Biol 2014; 97:351-62. [PMID: 25420918 DOI: 10.1189/jlb.3a0314-142rr] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Cl-amidine, which is a small-molecule inhibitor of PAD, has therapeutic potential for inflammation-mediated diseases. However, little is known regarding the manner by which PAD inhibition by Cl-amidine regulates inflammatory conditions. Here, we investigated the effects of PAD inhibition by Cl-amidine on the functioning of DCs, which are pivotal immune cells that mediate inflammatory diseases. When DC maturation was induced by TLR agonists, reduced cytokine levels (IL-6, IL-1β, and IL-12p70) were observed in Cl-amidine-treated DCs. Cl-amidine-treated, LPS-activated DCs exhibited alterations in their mature and functional statuses with up-regulated antigen uptake, down-regulated CD80, and MHC molecules. In addition, Cl-amidine-treated DCs dysregulated peptide-MHC class formations. Interestingly, the decreased cytokines were independent of MAPK/NF-κB signaling pathways and transcription levels, indicating that PAD inhibition by Cl-amidine may be involved in post-transcriptional steps of cytokine production. Transmission electron microscopy revealed morphotypical changes with reduced dendrites in the Cl-amidine-treated DCs, along with altered cellular compartments, including fragmented ERs and the formation of foamy vesicles. Furthermore, in vitro and in vivo Cl-amidine treatments impaired the proliferation of naïve CD4(+) and CD8(+) T cells. Overall, our findings suggest that Cl-amidine has therapeutic potential for treating inflammation-mediated diseases.
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Affiliation(s)
- Byungki Jang
- *Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Ho Won Kim
- *Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Jong-Seok Kim
- *Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Woo Sik Kim
- *Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Bo Ryeong Lee
- *Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Sojeong Kim
- *Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Hongmin Kim
- *Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Seung Jung Han
- *Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Sang-Jun Ha
- *Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Sung Jae Shin
- *Department of Microbiology, Institute for Immunology and Immunological Diseases, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
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131
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Tough DF, Lewis HD, Rioja I, Lindon MJ, Prinjha RK. Epigenetic pathway targets for the treatment of disease: accelerating progress in the development of pharmacological tools: IUPHAR Review 11. Br J Pharmacol 2014; 171:4981-5010. [PMID: 25060293 PMCID: PMC4253452 DOI: 10.1111/bph.12848] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 05/22/2014] [Accepted: 06/13/2014] [Indexed: 02/06/2023] Open
Abstract
The properties of a cell are determined both genetically by the DNA sequence of its genes and epigenetically through processes that regulate the pattern, timing and magnitude of expression of its genes. While the genetic basis of disease has been a topic of intense study for decades, recent years have seen a dramatic increase in the understanding of epigenetic regulatory mechanisms and a growing appreciation that epigenetic misregulation makes a significant contribution to human disease. Several large protein families have been identified that act in different ways to control the expression of genes through epigenetic mechanisms. Many of these protein families are finally proving tractable for the development of small molecules that modulate their function and represent new target classes for drug discovery. Here, we provide an overview of some of the key epigenetic regulatory proteins and discuss progress towards the development of pharmacological tools for use in research and therapy.
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Affiliation(s)
- David F Tough
- Immuno-Inflammation Therapy Area, GlaxoSmithKline R&D, Medicines Research Centre, Epinova DPU, Stevenage, UK
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132
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McElwee JL, Mohanan S, Horibata S, Sams KL, Anguish LJ, McLean D, Cvitaš I, Wakshlag JJ, Coonrod SA. PAD2 overexpression in transgenic mice promotes spontaneous skin neoplasia. Cancer Res 2014; 74:6306-17. [PMID: 25213324 DOI: 10.1158/0008-5472.can-14-0749] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Peptidylarginine deiminase 2 (PAD2/PADI2) has been implicated in various inflammatory diseases and, more recently, cancer. The goal of this study was to test the hypothesis that PAD2 promotes oncogenesis using a transgenic mouse model. We found that about 37% of transgenic mice overexpressing human FLAG-PAD2 downstream of the MMTV-LTR promoter develop spontaneous neoplastic skin lesions. Molecular and histopathologic analyses of the resulting lesions find that they contain increased levels of markers for invasion, inflammation, and epithelial-to-mesenchymal transition (EMT) and that a subset of the lesions progress to invasive squamous cell carcinoma (SCC). We then stably overexpressed FLAG-PAD2 in the human SCC cell line, A431, and found that the PAD2-overexpressing cells were more tumorigenic in vitro and also contained elevated levels of markers for inflammation and EMT. Collectively, these studies provide the first genetic evidence that PAD2 functions as an oncogene and suggest that PAD2 may promote tumor progression by enhancing inflammation within the tumor microenvironment.
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Affiliation(s)
- John L McElwee
- Department of Nutritional Sciences, College of Human Ecology, Cornell University, Ithaca, New York
| | | | - Sachi Horibata
- Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, New York
| | - Kelly L Sams
- Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, New York
| | - Lynne J Anguish
- Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, New York
| | - Dalton McLean
- Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, New York
| | - Iva Cvitaš
- Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia
| | - Joseph J Wakshlag
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York
| | - Scott A Coonrod
- Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, New York.
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133
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Ham A, Rabadi M, Kim M, Brown KM, Ma Z, D'Agati V, Lee HT. Peptidyl arginine deiminase-4 activation exacerbates kidney ischemia-reperfusion injury. Am J Physiol Renal Physiol 2014; 307:F1052-62. [PMID: 25164081 DOI: 10.1152/ajprenal.00243.2014] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Peptidyl arginine deiminase (PAD)4 is a nuclear enzyme that catalyzes the posttranslational conversion of arginine residues to citrulline. Posttranslational protein citrullination has been implicated in several inflammatory autoimmune diseases, including rheumatoid arthritis, colitis, and multiple sclerosis. Here, we tested the hypothesis that PAD4 contributes to ischemic acute kidney injury (AKI) by exacerbating the inflammatory response after renal ischemia-reperfusion (I/R). Renal I/R injury in mice increased PAD4 activity as well as PAD4 expression in the mouse kidney. After 30 min of renal I/R, vehicle-treated mice developed severe AKI with large increases in plasma creatinine. In contrast, mice pretreated with PAD4 inhibitors (2-chloroamidine or streptonigrin) had significantly reduced renal I/R injury. Further supporting a critical role for PAD4 in generating ischemic AKI, mice pretreated with recombinant human PAD4 (rPAD4) protein and subjected to mild (20 min) renal I/R developed exacerbated ischemic AKI. Consistent with the hypothesis that PAD4 regulates renal tubular inflammation after I/R, mice treated with a PAD4 inhibitor had significantly reduced renal neutrophil chemotactic cytokine (macrophage inflammatory protein-2 and keratinocyte-derived cytokine) expression and had decreased neutrophil infiltration. Furthermore, mice treated with rPAD4 had significantly increased renal tubular macrophage inflammatory protein-2 and keratinocyte-derived cytokine expression as well as increased neutrophil infiltration and necrosis. Finally, cultured mouse kidney proximal tubules treated with rPAD4 had significantly increased proinflammatory chemokine expression compared with vehicle-treated cells. Taken together, our results suggest that PAD4 plays a critical role in renal I/R injury by increasing renal tubular inflammatory responses and neutrophil infiltration after renal I/R.
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Affiliation(s)
- Ahrom Ham
- Department of Anesthesiology, College of Physicians and Surgeons of Columbia University, New York, New York; and
| | - May Rabadi
- Department of Anesthesiology, College of Physicians and Surgeons of Columbia University, New York, New York; and
| | - Mihwa Kim
- Department of Anesthesiology, College of Physicians and Surgeons of Columbia University, New York, New York; and
| | - Kevin M Brown
- Department of Anesthesiology, College of Physicians and Surgeons of Columbia University, New York, New York; and
| | - Zhe Ma
- Department of Anesthesiology, College of Physicians and Surgeons of Columbia University, New York, New York; and
| | - Vivette D'Agati
- Department of Pathology, College of Physicians and Surgeons of Columbia University, New York, New York
| | - H Thomas Lee
- Department of Anesthesiology, College of Physicians and Surgeons of Columbia University, New York, New York; and
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134
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Knight JS, Subramanian V, O'Dell AA, Yalavarthi S, Zhao W, Smith CK, Hodgin JB, Thompson PR, Kaplan MJ. Peptidylarginine deiminase inhibition disrupts NET formation and protects against kidney, skin and vascular disease in lupus-prone MRL/lpr mice. Ann Rheum Dis 2014; 74:2199-206. [PMID: 25104775 DOI: 10.1136/annrheumdis-2014-205365] [Citation(s) in RCA: 301] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 07/17/2014] [Indexed: 12/12/2022]
Abstract
OBJECTIVES An imbalance between neutrophil extracellular trap (NET) formation and degradation has been described in systemic lupus erythematosus (SLE), potentially contributing to autoantigen externalisation, type I interferon synthesis and endothelial damage. We have demonstrated that peptidylarginine deiminase (PAD) inhibition reduces NET formation and protects against lupus-related vascular damage in the New Zealand Mixed model of lupus. However, another strategy for inhibiting NETs--knockout of NOX2--accelerates lupus in a different murine model, MRL/lpr. Here, we test the effects of PAD inhibition on MRL/lpr mice in order to clarify whether some NET inhibitory pathways may be consistently therapeutic across models of SLE. METHODS NET formation and autoantibodies to NETs were characterised in lupus-prone MRL/lpr mice. MRL/lpr mice were also treated with two different PAD inhibitors, Cl-amidine and the newly described BB-Cl-amidine. NET formation, endothelial function, interferon signature, nephritis and skin disease were examined in treated mice. RESULTS Neutrophils from MRL/lpr mice demonstrate accelerated NET formation compared with controls. MRL/lpr mice also form autoantibodies to NETs and have evidence of endothelial dysfunction. PAD inhibition markedly improves endothelial function, while downregulating the expression of type I interferon-regulated genes. PAD inhibition also reduces proteinuria and immune complex deposition in the kidneys, while protecting against skin disease. CONCLUSIONS PAD inhibition reduces NET formation, while protecting against lupus-related damage to the vasculature, kidneys and skin in various lupus models. The strategy by which NETs are inhibited will have to be carefully considered if human studies are to be undertaken.
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Affiliation(s)
- Jason S Knight
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | | | - Alexander A O'Dell
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Srilakshmi Yalavarthi
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Wenpu Zhao
- Systemic Autoimmunity Branch, Intramural Research Program, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Carolyne K Smith
- Systemic Autoimmunity Branch, Intramural Research Program, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Jeffrey B Hodgin
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - Paul R Thompson
- Department of Chemistry, The Scripps Research Institute, Jupiter, Florida, USA
| | - Mariana J Kaplan
- Systemic Autoimmunity Branch, Intramural Research Program, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland, USA
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135
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Radic M. Clearance of Apoptotic Bodies, NETs, and Biofilm DNA: Implications for Autoimmunity. Front Immunol 2014; 5:365. [PMID: 25126089 PMCID: PMC4115591 DOI: 10.3389/fimmu.2014.00365] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 07/15/2014] [Indexed: 12/11/2022] Open
Affiliation(s)
- Marko Radic
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center , Memphis, TN , USA
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136
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Dreyton CJ, Knuckley B, Jones JE, Lewallen DM, Thompson PR. Mechanistic studies of protein arginine deiminase 2: evidence for a substrate-assisted mechanism. Biochemistry 2014; 53:4426-33. [PMID: 24989433 PMCID: PMC4100781 DOI: 10.1021/bi500554b] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
![]()
Citrullination, which is catalyzed
by protein arginine deiminases
(PADs 1–4 and 6), is a post-translational modification (PTM)
that effectively neutralizes the positive charge of a guanidinium
group by its replacement with a neutral urea. Given the sequence similarity
of PAD2 across mammalian species and the genomic organization of the
PAD2 gene, PAD2 is predicted to be the ancestral homologue of the
PADs. Although PAD2 has long been known to play a role in myelination,
it has only recently been linked to other cellular processes, including
gene transcription and macrophage extracellular trap formation. For
example, PAD2 deiminates histone H3 at R26, and this PTM leads to
the increased transcription of more than 200 genes under the control
of the estrogen receptor. Given that our understanding of PAD2 biology
remains incomplete, we initiated mechanistic studies on this enzyme
to aid the development of PAD2-specific inhibitors. Herein, we report
that the substrate specificity and calcium dependence of PAD2 are
similar to those of PADs 1, 3, and 4. However, unlike those isozymes,
PAD2 appears to use a substrate-assisted mechanism of catalysis in
which the positively charged substrate guanidinium depresses the pKa of the nucleophilic cysteine. By contrast,
PADs 1, 3, and 4 use a reverse-protonation mechanism. These mechanistic
differences will aid the development of isozyme-specific inhibitors.
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Affiliation(s)
- Christina J Dreyton
- Department of Chemistry and The Kellogg School of Graduate Studies, The Scripps Research Institute-Florida , 130 Scripps Way, Jupiter, Florida 33458, United States
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137
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Shelef MA, Sokolove J, Lahey LJ, Wagner CA, Sackmann EK, Warner TF, Wang Y, Beebe DJ, Robinson WH, Huttenlocher A. Peptidylarginine deiminase 4 contributes to tumor necrosis factor α-induced inflammatory arthritis. Arthritis Rheumatol 2014; 66:1482-91. [PMID: 24497204 PMCID: PMC4148484 DOI: 10.1002/art.38393] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 01/30/2014] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Peptidylarginine deiminase 4 (PAD4) is a citrullinating enzyme that has multiple associations with inflammation. In rheumatoid arthritis, PAD4 and protein citrullination are increased in inflamed joints, and anti-citrullinated protein antibodies (ACPAs) form against citrullinated antigens are formed. ACPA immune complexes can deposit in the joint and induce the production of tumor necrosis factor α (TNFα), a critical inflammatory cytokine in the pathogenesis of rheumatoid arthritis. Further, in other settings, TNFα has been shown to induce PAD4 activity and modulate antibody formation. We undertook this study to investigate whether TNFα and PAD4 may synergistically exacerbate autoantibody production and inflammatory arthritis. METHODS To determine whether TNFα and PAD4 augment autoantibody production and inflammatory arthritis, we first used a multiplex assay to determine whether mice with chronic inflammatory arthritis due to overexpression of TNFα develop autoantibodies against native and citrullinated antigens. With TNF(+) PAD4(+/+) and TNF(+) PAD4(-/-) mice, we then compared serum autoantibody levels by multiplex array, lymphocyte activation by flow cytometry, total serum IgG levels by enzyme-linked immunosorbent assay, arthritis by clinical and histologic scoring, and systemic inflammation using microfluidic devices. RESULTS TNFα-overexpressing mice had increased levels of autoantibodies reactive against native and citrullinated antigens. PAD4(-/-) mice with TNFα-induced arthritis had lower levels of autoantibodies reactive against native and citrullinated antigens, decreased T cell activation and total IgG levels, and reduced inflammation and arthritis compared to PAD4(+/+) TNFα-overexpressing mice. CONCLUSION PAD4 mediates autoantibody production and inflammatory arthritis downstream of TNFα.
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Affiliation(s)
- Miriam A. Shelef
- University of Wisconsin–Madison and William S. Middleton Memorial VA Hospital, Madison, Wisconsin
| | - Jeremy Sokolove
- Stanford University and VA Palo Alto Health Care System, Palo Alto, California
| | - Lauren J. Lahey
- Stanford University and VA Palo Alto Health Care System, Palo Alto, California
| | - Catriona A. Wagner
- Stanford University and VA Palo Alto Health Care System, Palo Alto, California
| | | | | | | | | | - William H. Robinson
- Stanford University and VA Palo Alto Health Care System, Palo Alto, California
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138
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Slade DJ, Horibata S, Coonrod SA, Thompson PR. A novel role for protein arginine deiminase 4 in pluripotency: the emerging role of citrullinated histone H1 in cellular programming. Bioessays 2014; 36:736-40. [PMID: 24889365 DOI: 10.1002/bies.201400057] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Histone post-translational modifications (PTMs) alter the chromatin architecture, generating "open" and "closed" states, and these structural changes can modulate gene expression under specific cellular conditions. While methylation and acetylation are the best-characterized histone PTMs, citrullination by the protein arginine deiminases (PADs) represents another important player in this process. In addition to "fine tuning" chromatin structure at specific loci, histone citrullination can also promote rapid global chromatin decondensation during the formation of extracellular traps (ETs) in immune cells. Recent studies now show that PAD4-mediated citrullination of histone H1 at promoter elements can also promote localized chromatin decondensation in stem cells, thus regulating the pluripotent state. These observations suggest that PAD-mediated histone deimination profoundly affects chromatin structure, possibly above and beyond that of other PTMs. Additionally, these recent findings further enhance our understanding of PAD biology and the important contributions that these enzymes play in development, health, and disease.
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Affiliation(s)
- Daniel J Slade
- Department of Chemistry, The Scripps Research Institute, Jupiter, FL, USA
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139
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Döring Y, Soehnlein O, Weber C. Neutrophils cast NETs in atherosclerosis: employing peptidylarginine deiminase as a therapeutic target. Circ Res 2014; 114:931-4. [PMID: 24625721 DOI: 10.1161/circresaha.114.303479] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Yvonne Döring
- From Institute for Cardiovascular Prevention, Ludwig-Maximilians-University Munich, Germany (Y.D., O.S., C.W.); Academic Medical Center, Department of Pathology, Amsterdam University, the Netherlands (O.S.); and DZHK (German Centre for Cardiovascular Research), partner site Munich Heart Alliance, Germany (O.S., C.W.)
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140
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Lewallen DM, Bicker KL, Madoux F, Chase P, Anguish L, Coonrod S, Hodder P, Thompson PR. A FluoPol-ABPP PAD2 high-throughput screen identifies the first calcium site inhibitor targeting the PADs. ACS Chem Biol 2014; 9:913-21. [PMID: 24467619 PMCID: PMC4108211 DOI: 10.1021/cb400841k] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
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The protein arginine deiminases (PADs)
catalyze the post-translational
hydrolysis of peptidyl-arginine to form peptidyl-citrulline in a process
termed deimination or citrullination. PADs likely play a role in the
progression of a range of disease states because dysregulated PAD
activity is observed in a host of inflammatory diseases and cancer.
For example, recent studies have shown that PAD2 activates ERα
target gene expression in breast cancer cells by citrullinating histone
H3 at ER target promoters. To date, all known PAD inhibitors bind
directly to the enzyme active site. PADs, however, also require calcium
ions to drive a conformational change between the inactive apo-state
and the fully active calcium bound holoenzyme, suggesting that it
would be possible to identify inhibitors that bind the apoenzyme and
prevent this conformational change. As such, we set out to develop
a screen that can identify PAD2 inhibitors that bind to either the
apo or calcium bound form of PAD2. Herein, we provide definitive proof
of concept for this approach and report the first PAD inhibitor, ruthenium
red (Ki of 17 μM), to preferentially
bind the apoenzyme.
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Affiliation(s)
| | | | - Franck Madoux
- Baker
Institute for Animal Health, College of Veterinary Medicine, Cornell University, Hungerford Hill Rd., Ithaca, New York 14850, United States
| | - Peter Chase
- Baker
Institute for Animal Health, College of Veterinary Medicine, Cornell University, Hungerford Hill Rd., Ithaca, New York 14850, United States
| | | | | | - Peter Hodder
- Baker
Institute for Animal Health, College of Veterinary Medicine, Cornell University, Hungerford Hill Rd., Ithaca, New York 14850, United States
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141
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U KP, Subramanian V, Nicholas AP, Thompson PR, Ferretti P. Modulation of calcium-induced cell death in human neural stem cells by the novel peptidylarginine deiminase-AIF pathway. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1843:1162-71. [PMID: 24607566 PMCID: PMC3996523 DOI: 10.1016/j.bbamcr.2014.02.018] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 02/19/2014] [Accepted: 02/24/2014] [Indexed: 11/29/2022]
Abstract
PADs (peptidylarginine deiminases) are calcium-dependent enzymes that change protein-bound arginine to citrulline (citrullination/deimination) affecting protein conformation and function. PAD up-regulation following chick spinal cord injury has been linked to extensive tissue damage and loss of regenerative capability. Having found that human neural stem cells (hNSCs) expressed PAD2 and PAD3, we studied PAD function in these cells and investigated PAD3 as a potential target for neuroprotection by mimicking calcium-induced secondary injury responses. We show that PAD3, rather than PAD2 is a modulator of cell growth/death and that PAD activity is not associated with caspase-3-dependent cell death, but is required for AIF (apoptosis inducing factor)-mediated apoptosis. PAD inhibition prevents association of PAD3 with AIF and AIF cleavage required for its translocation to the nucleus. Finally, PAD inhibition also hinders calcium-induced cytoskeleton disassembly and association of PAD3 with vimentin, that we show to be associated also with AIF; together this suggests that PAD-dependent cytoskeleton disassembly may play a role in AIF translocation to the nucleus. This is the first study highlighting a role of PAD activity in balancing hNSC survival/death, identifying PAD3 as an important upstream regulator of calcium-induced apoptosis, which could be targeted to reduce neural loss, and shedding light on the mechanisms involved.
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Affiliation(s)
- Kin Pong U
- Developmental Biology Unit, UCL Institute of Child Health, London WC1N 1EH, UK
| | | | - Antony P Nicholas
- Department of Neurology, University of Alabama at Birmingham and Birmingham VA Medical Center, Birmingham, AL 35294, USA
| | - Paul R Thompson
- Department of Chemistry, TSRI, Scripps Florida, FL 33458, USA
| | - Patrizia Ferretti
- Developmental Biology Unit, UCL Institute of Child Health, London WC1N 1EH, UK.
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142
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Slade DJ, Subramanian V, Fuhrmann J, Thompson PR. Chemical and biological methods to detect post-translational modifications of arginine. Biopolymers 2014; 101:133-43. [PMID: 23576281 PMCID: PMC3900596 DOI: 10.1002/bip.22256] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Accepted: 04/01/2013] [Indexed: 12/11/2022]
Abstract
Post-translational modifications (PTMs) of protein embedded arginines are increasingly being recognized as playing an important role in both prokaryotic and eukaryotic biology, and it is now clear that these PTMs modulate a number of cellular processes including DNA binding, gene transcription, protein-protein interactions, immune system activation, and proteolysis. There are currently four known enzymatic PTMs of arginine (i.e., citrullination, methylation, phosphorylation, and ADP-ribosylation), and two non-enzymatic PTMs [i.e., carbonylation, advanced glycation end-products (AGEs)]. Enzymatic modification of arginine is tightly controlled during normal cellular function, and can be drastically altered in response to various second messengers and in different disease states. Non-enzymatic arginine modifications are associated with a loss of metabolite regulation during normal human aging. This abnormally large number of modifications to a single amino acid creates a diverse set of structural perturbations that can lead to altered biological responses. While the biological role of methylation has been the most extensively characterized of the arginine PTMs, recent advances have shown that the once obscure modification known as citrullination is involved in the onset and progression of inflammatory diseases and cancer. This review will highlight the reported arginine PTMs and their methods of detection, with a focus on new chemical methods to detect protein citrullination.
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Affiliation(s)
- Daniel J. Slade
- Department of Chemistry, The Kellogg School of Graduate Studies, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA
| | - Venkataraman Subramanian
- Department of Chemistry, The Kellogg School of Graduate Studies, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA
| | - Jakob Fuhrmann
- Department of Chemistry, The Kellogg School of Graduate Studies, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA
| | - Paul R. Thompson
- Department of Chemistry, The Kellogg School of Graduate Studies, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA
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143
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Dreyton CJ, Anderson ED, Subramanian V, Boger DL, Thompson PR. Insights into the mechanism of streptonigrin-induced protein arginine deiminase inactivation. Bioorg Med Chem 2014; 22:1362-9. [PMID: 24440480 DOI: 10.1016/j.bmc.2013.12.064] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 12/18/2013] [Accepted: 12/29/2013] [Indexed: 10/25/2022]
Abstract
Protein citrullination is just one of more than 200 known PTMs. This modification, catalyzed by the protein arginine deiminases (PADs 1-4 and PAD6 in humans), converts the positively charged guanidinium group of an arginine residue into a neutral ureido-group. Given the strong links between dysregulated PAD activity and human disease, we initiated a program to develop PAD inhibitors as potential therapeutics for these and other diseases in which the PADs are thought to play a role. Streptonigrin which possesses both anti-tumor and anti-bacterial activity was later identified as a highly potent PAD4 inhibitor. In an effort to understand why streptonigrin is such a potent and selective PAD4 inhibitor, we explored its structure-activity relationships by examining the inhibitory effects of several analogues that mimic the A, B, C, and/or D rings of streptonigrin. We report the identification of the 7-amino-quinoline-5,8-dione core of streptonigrin as a highly potent pharmacophore that acts as a pan-PAD inhibitor.
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Affiliation(s)
- Christina J Dreyton
- Department of Chemistry and The Kellogg School of Graduate Studies, The Scripps Research Institute-Florida, 130 Scripps Way, Jupiter, FL 33458, United States
| | - Erin D Anderson
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States
| | - Venkataraman Subramanian
- Department of Chemistry and The Kellogg School of Graduate Studies, The Scripps Research Institute-Florida, 130 Scripps Way, Jupiter, FL 33458, United States
| | - Dale L Boger
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States
| | - Paul R Thompson
- Department of Chemistry and The Kellogg School of Graduate Studies, The Scripps Research Institute-Florida, 130 Scripps Way, Jupiter, FL 33458, United States.
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144
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Nakazawa D, Shida H, Tomaru U, Yoshida M, Nishio S, Atsumi T, Ishizu A. Enhanced formation and disordered regulation of NETs in myeloperoxidase-ANCA-associated microscopic polyangiitis. J Am Soc Nephrol 2014; 25:990-7. [PMID: 24385592 DOI: 10.1681/asn.2013060606] [Citation(s) in RCA: 178] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Microscopic polyangiitis (MPA) is an ANCA-associated vasculitis that affects small vessels, especially renal glomeruli. We recently demonstrated that the abnormal formation and impaired degradation of neutrophil extracellular traps (NETs) may be crucially involved in the generation of myeloperoxidase (MPO)-ANCA and subsequent development of MPA. This study assessed the formation and regulation of NETs in patients with MPO-ANCA-associated MPA. Peripheral blood samples were obtained from 38 patients with MPO-ANCA-associated MPA, 23 patients with systemic lupus erythematosus (SLE), and 8 healthy controls. IgG eluted from MPO-ANCA-associated MPA sera demonstrated the highest ability to induce NETs, and this ability correlated with disease activity and paralleled ANCA affinity for MPO. Moreover, addition of recombinant human MPO to these IgG samples reduced NET induction. Additionally, MPO-ANCA-associated MPA sera exhibited lower rates of NET degradation that recovered partially upon depletion of IgG. The activity of DNase I, an important regulator of NETs, was also lower in MPO-ANCA-associated MPA and SLE sera. IgG depletion from MPO-ANCA-associated MPA sera partially restored the rate of NET degradation, and addition of DNase I synergistically enhanced this restoration. Addition of anti-MPO antibodies did not inhibit DNase I activity, and some MPO-ANCA-associated MPA sera contained anti-NET antibodies at levels not correlated with MPO-ANCA titers, suggesting the involvement of unidentified autoantibodies as well. The collective evidence suggests a vicious cycle involving MPO-ANCA and the regulation of NETs could be critically involved in the pathogenesis of MPO-ANCA-associated MPA.
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Affiliation(s)
| | | | - Utano Tomaru
- Department of Pathology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Masaharu Yoshida
- Renal Unit of Internal Medicine, Hachioji Medical Center, Tokyo Medical University, Hachioji, Japan; and
| | | | | | - Akihiro Ishizu
- Faculty of Health Sciences, Hokkaido University, Sapporo, Japan
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145
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Nakashima K, Arai S, Suzuki A, Nariai Y, Urano T, Nakayama M, Ohara O, Yamamura KI, Yamamoto K, Miyazaki T. PAD4 regulates proliferation of multipotent haematopoietic cells by controlling c-myc expression. Nat Commun 2013; 4:1836. [PMID: 23673621 PMCID: PMC3674250 DOI: 10.1038/ncomms2862] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Accepted: 04/04/2013] [Indexed: 01/08/2023] Open
Abstract
Peptidylarginine deiminase 4 (PAD4) functions as a transcriptional coregulator by catalyzing the conversion of histone H3 arginine residues to citrulline residues. Although the high level of PAD4 expression in bone marrow cells suggests its involvement in haematopoiesis, its precise contribution remains unclear. Here we show that PAD4, which is highly expressed in lineage− Sca-1+ c-Kit+ (LSK) cells of mouse bone marrow compared with other progenitor cells, controls c-myc expression by catalyzing the citrullination of histone H3 on its promoter. Furthermore, PAD4 is associated with lymphoid enhancer-binding factor 1 and histone deacetylase 1 at the upstream region of the c-myc gene. Supporting these findings, LSK cells, especially multipotent progenitors, in PAD4-deficient mice show increased proliferation in a cell-autonomous fashion compared with those in wild-type mice. Together, our results strongly suggest that PAD4 regulates the proliferation of multipotent progenitors in the bone marrow by controlling c-myc expression. Histone citrullination by peptidylarginine deiminase 4 (PAD4) regulates transcription but its physiological role is unclear. Here Nakashima et al. show that PAD4 controls proliferation of multipotent haematopoietic cells by modulating c-myc expression.
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Affiliation(s)
- Katsuhiko Nakashima
- Laboratory of Molecular Biomedicine for Pathogenesis, Center for Disease Biology and Integrative Medicine, Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033, Japan.
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146
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Moelants EA, Mortier A, Van Damme J, Proost P, Loos T. Peptidylarginine deiminases: physiological function, interaction with chemokines and role in pathology. DRUG DISCOVERY TODAY. TECHNOLOGIES 2013; 9:e227-314. [PMID: 24063741 DOI: 10.1016/j.ddtec.2012.06.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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147
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Radic M, Muller S. Epigenetics of autoantigens: new opportunities for therapy of autoimmune diseases. GENETICS & EPIGENETICS 2013; 5:63-70. [PMID: 25512708 PMCID: PMC4222337 DOI: 10.4137/geg.s12144] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The field of epigenetics requires that traditional divisions between scientific disciplines give way to cross-fertilization of concepts and ideas from different areas of investigation. Such is the case with research in autoimmunity. Recent discoveries of stimuli that induce autoimmunity reveal that epigenetic marks of autoantigens are recognized by autoreactive B and T cell receptors. Thus, insights into the initiation of autoimmunity, its prevention and therapy will arise from understanding the biochemistry, cell biology and microbiology of autoantigen epigenetics. Here, we highlight potential benefits from the inhibition of a histone modifying enzyme and the administration of a phosphorylated, spliceosome-derived peptide, in the treatment of autoimmunity.
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Affiliation(s)
- Marko Radic
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Sylviane Muller
- Immunopathology and therapeutic chemistry/Laboratory of excellence MEDALIS, Institut de Biologie Moléculaire et Cellulaire, CNRS, Strasbourg, France
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148
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Abstract
In this review, we examine the evidence that neutrophil extracellular traps (NETs) play a critical role in innate immunity. We summarize how NETs are formed in response to various stimuli and provide evidence that NETosis is not universally a cell death pathway. Here we describe at least 2 different mechanisms by which NETs are formed, including a suicide lytic NETosis and a live cell or vital NETosis. We also evaluate the evidence for NETs in catching and killing pathogens. Finally, we examine how infections are related to the development of autoimmune and vasculitic diseases through unintended but detrimental bystander damage resulting from NET release.
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149
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Knight JS, Zhao W, Luo W, Subramanian V, O'Dell AA, Yalavarthi S, Hodgin JB, Eitzman DT, Thompson PR, Kaplan MJ. Peptidylarginine deiminase inhibition is immunomodulatory and vasculoprotective in murine lupus. J Clin Invest 2013; 123:2981-93. [PMID: 23722903 DOI: 10.1172/jci67390] [Citation(s) in RCA: 291] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Accepted: 04/05/2013] [Indexed: 12/11/2022] Open
Abstract
Recent evidence suggests that enhanced neutrophil extracellular trap (NET) formation activates plasmacytoid dendritic cells and serves as a source of autoantigens in SLE. We propose that aberrant NET formation is also linked to organ damage and to the premature vascular disease characteristic of human SLE. Here, we demonstrate enhanced NET formation in the New Zealand mixed 2328 (NZM) model of murine lupus. NZM mice also developed autoantibodies to NETs as well as the ortholog of human cathelicidin/LL37 (CRAMP), a molecule externalized in the NETs. NZM mice were treated with Cl-amidine, an inhibitor of peptidylarginine deiminases (PAD), to block NET formation and were evaluated for lupus-like disease activity, endothelial function, and prothrombotic phenotype. Cl-amidine treatment inhibited NZM NET formation in vivo and significantly altered circulating autoantibody profiles and complement levels while reducing glomerular IgG deposition. Further, Cl-amidine increased the differentiation capacity of bone marrow endothelial progenitor cells, improved endothelium-dependent vasorelaxation, and markedly delayed time to arterial thrombosis induced by photochemical injury. Overall, these findings suggest that PAD inhibition can modulate phenotypes crucial for lupus pathogenesis and disease activity and may represent an important strategy for mitigating cardiovascular risk in lupus patients.
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Affiliation(s)
- Jason S Knight
- Division of Rheumatology, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan 48109-5680, USA
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150
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Cui X, Witalison EE, Chumanevich AP, Chumanevich AA, Poudyal D, Subramanian V, Schetter AJ, Harris CC, Thompson PR, Hofseth LJ. The induction of microRNA-16 in colon cancer cells by protein arginine deiminase inhibition causes a p53-dependent cell cycle arrest. PLoS One 2013; 8:e53791. [PMID: 23308284 PMCID: PMC3538596 DOI: 10.1371/journal.pone.0053791] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 12/05/2012] [Indexed: 01/07/2023] Open
Abstract
Protein Arginine Deiminases (PADs) catalyze the post-translational conversion of peptidyl-Arginine to peptidyl-Citrulline in a calcium-dependent, irreversible reaction. Evidence is emerging that PADs play a role in carcinogenesis. To determine the cancer-associated functional implications of PADs, we designed a small molecule PAD inhibitor (called Chor-amidine or Cl-amidine), and tested the impact of this drug on the cell cycle. Data derived from experiments in colon cancer cells indicate that Cl-amidine causes a G1 arrest, and that this was p53-dependent. In a separate set of experiments, we found that Cl-amidine caused a significant increase in microRNA-16 (miRNA-16), and that this increase was also p53-dependent. Because miRNA-16 is a putative tumor suppressor miRNA, and others have found that miRNA-16 suppresses proliferation, we hypothesized that the p53-dependent G1 arrest associated with PAD inhibition was, in turn, dependent on miRNA-16 expression. Results are consistent with this hypothesis. As well, we found the G1 arrest is at least in part due to the ability of Cl-amidine-mediated expression of miRNA-16 to suppress its' G1-associated targets: cyclins D1, D2, D3, E1, and cdk6. Our study sheds light into the mechanisms by which PAD inhibition can protect against or treat colon cancer.
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Affiliation(s)
- Xiangli Cui
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina, United States of America
- Shanxi Medical University, Shanxi, China
| | - Erin E. Witalison
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina, United States of America
| | - Alena P. Chumanevich
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina, United States of America
| | - Alexander A. Chumanevich
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina, United States of America
| | - Deepak Poudyal
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina, United States of America
| | - Venkataraman Subramanian
- Department of Chemistry, The Scripps Research Institute, Scripps Florida, Jupiter, Florida, United States of America
| | - Aaron J. Schetter
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Curtis C. Harris
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Paul R. Thompson
- Department of Chemistry, The Scripps Research Institute, Scripps Florida, Jupiter, Florida, United States of America
| | - Lorne J. Hofseth
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, South Carolina, United States of America
- * E-mail:
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