1
|
Albano C, Biolatti M, Mazibrada J, Pasquero S, Gugliesi F, Lo Cigno I, Calati F, Bajetto G, Riva G, Griffante G, Landolfo S, Gariglio M, De Andrea M, Dell’Oste V. PAD-mediated citrullination is a novel candidate diagnostic marker and druggable target for HPV-associated cervical cancer. Front Cell Infect Microbiol 2024; 14:1359367. [PMID: 38529474 PMCID: PMC10961408 DOI: 10.3389/fcimb.2024.1359367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 02/27/2024] [Indexed: 03/27/2024] Open
Abstract
Citrullination is an emerging post-translational modification catalyzed by peptidyl-arginine deiminases (PADs) that convert peptidyl-arginine into peptidyl-citrulline. In humans, the PAD family consists of five isozymes (PADs 1-4, 6) involved in multiple diseases, including cancer. Given that high-risk (hr) human papillomaviruses (HPVs) are the etiological agents of cervical cancer, in this study, we sought to determine whether PAD-mediated protein citrullination would play a functional role in the HPV-driven transformation of epithelial cells. Here we show that both total protein citrullination and PAD4 expression levels are significantly associated with cervical cancer progression. Specifically, epithelial immunostaining for PAD4 revealed an increasingly higher histoscore from low-grade (CIN1) to high-grade (CIN2, CIN3) cervical intraepithelial neoplasia, and invasive squamous cell carcinoma (SCC) lesions, raising the attractive possibility that PAD4 may be used as tumor staging markers. Furthermore, taking advantage of the epidermoid cervical cancer cell line CaSki, which harbors multiple copies of the integrated HPV16 genome, we show that the expression of E6 and E7 HPV oncoproteins is impaired by treatment with the pharmacological pan-PAD inhibitor BB-Cl-amidine. Consistently, p53 and p21, two targets of HPV oncoproteins, are upregulated by the PAD inhibitor, which undergoes cell growth arrest and apoptosis. Altogether, these findings highlight a novel mechanism by which hrHPVs alter host regulatory pathways involved in cell cycle and survival to gain viral fitness, raising the possibility that PADs may represent an attractive target for developing novel host-targeting antivirals effective in preventing cervical cancer progression.
Collapse
Affiliation(s)
- Camilla Albano
- Department of Public Health and Pediatric Sciences, University of Turin, Turin, Italy
| | - Matteo Biolatti
- Department of Public Health and Pediatric Sciences, University of Turin, Turin, Italy
| | - Jasenka Mazibrada
- Department of Cellular Pathology, The Cotman Centre Norfolk and Norwich University Hospital, Norwich, United Kingdom
| | - Selina Pasquero
- Department of Public Health and Pediatric Sciences, University of Turin, Turin, Italy
| | - Francesca Gugliesi
- Department of Public Health and Pediatric Sciences, University of Turin, Turin, Italy
| | - Irene Lo Cigno
- Department of Translational Medicine, University of Eastern Piedmont, Novara, Italy
| | - Federica Calati
- Department of Translational Medicine, University of Eastern Piedmont, Novara, Italy
| | - Greta Bajetto
- Department of Public Health and Pediatric Sciences, University of Turin, Turin, Italy
- Department of Translational Medicine, University of Eastern Piedmont, Novara, Italy
- Center for Translational Research on Autoimmune and Allergic Disease-CAAD, Novara, Italy
| | - Giuseppe Riva
- Department of Surgical Sciences, University of Turin, Turin, Italy
| | - Gloria Griffante
- IIGM Foundation – Italian Institute for Genomic Medicine, Turin, Italy
- Candiolo Cancer Institute, FPO-IRCCS, Turin, Italy
| | - Santo Landolfo
- Department of Public Health and Pediatric Sciences, University of Turin, Turin, Italy
| | - Marisa Gariglio
- Department of Translational Medicine, University of Eastern Piedmont, Novara, Italy
| | - Marco De Andrea
- Department of Public Health and Pediatric Sciences, University of Turin, Turin, Italy
- Center for Translational Research on Autoimmune and Allergic Disease-CAAD, Novara, Italy
| | - Valentina Dell’Oste
- Department of Public Health and Pediatric Sciences, University of Turin, Turin, Italy
| |
Collapse
|
2
|
Nava-Quiroz KJ, López-Flores LA, Pérez-Rubio G, Rojas-Serrano J, Falfán-Valencia R. Peptidyl Arginine Deiminases in Chronic Diseases: A Focus on Rheumatoid Arthritis and Interstitial Lung Disease. Cells 2023; 12:2829. [PMID: 38132149 PMCID: PMC10741699 DOI: 10.3390/cells12242829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 12/03/2023] [Accepted: 12/09/2023] [Indexed: 12/23/2023] Open
Abstract
Protein citrullination is accomplished by a broad enzyme family named Peptidyl Arginine Deiminases (PADs), which makes this post-translational modification in many proteins that perform physiological and pathologic mechanisms in the body. Due to these modifications, citrullination has become a significant topic in the study of pathological processes. It has been related to some chronic and autoimmune diseases, including rheumatoid arthritis (RA), interstitial lung diseases (ILD), multiple sclerosis (MS), and certain types of cancer, among others. Antibody production against different targets, including filaggrin, vimentin, and collagen, results in an immune response if they are citrullinated, which triggers a continuous inflammatory process characteristic of autoimmune and certain chronic diseases. PAD coding genes (PADI1 to PADI4 and PADI6) harbor variations that can be important in these enzymes' folding, activity, function, and half-life. However, few studies have considered these genetic factors in the context of chronic diseases. Exploring PAD pathways and their role in autoimmune and chronic diseases is a major topic in developing new pharmacological targets and valuable biomarkers to improve diagnosis and prevention. The present review addresses and highlights genetic, molecular, biochemical, and physiopathological factors where PAD enzymes perform a major role in autoimmune and chronic diseases.
Collapse
Affiliation(s)
- Karol J. Nava-Quiroz
- HLA Laboratory, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Tlalpan, Mexico City 14080, Mexico; (K.J.N.-Q.); (G.P.-R.)
- Programa de Doctorado en Ciencias Médicas Odontológicas y de la Salud, Universidad Nacional Autónoma de México (UNAM), Mexico City 04510, Mexico
| | - Luis A. López-Flores
- HLA Laboratory, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Tlalpan, Mexico City 14080, Mexico; (K.J.N.-Q.); (G.P.-R.)
- Programa de Doctorado en Ciencias Médicas Odontológicas y de la Salud, Universidad Nacional Autónoma de México (UNAM), Mexico City 04510, Mexico
| | - Gloria Pérez-Rubio
- HLA Laboratory, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Tlalpan, Mexico City 14080, Mexico; (K.J.N.-Q.); (G.P.-R.)
| | - Jorge Rojas-Serrano
- Rheumatology Clinic, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Tlalpan, Mexico City 14080, Mexico
| | - Ramcés Falfán-Valencia
- HLA Laboratory, Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas, Tlalpan, Mexico City 14080, Mexico; (K.J.N.-Q.); (G.P.-R.)
| |
Collapse
|
3
|
Wang B, Fields L, Li L. Recent advances in characterization of citrullination and its implication in human disease research: From method development to network integration. Proteomics 2023; 23:e2200286. [PMID: 36546832 PMCID: PMC10285031 DOI: 10.1002/pmic.202200286] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 12/12/2022] [Accepted: 12/13/2022] [Indexed: 12/24/2022]
Abstract
Post-translational modifications (PTM) of proteins increase the functional diversity of the proteome and have been implicated in the pathogenesis of numerous diseases. The most widely understood modifications include phosphorylation, methylation, acetylation, O-linked/N-linked glycosylation, and ubiquitination, all of which have been extensively studied and documented. Citrullination is a historically less explored, yet increasingly studied, protein PTM which has profound effects on protein conformation and protein-protein interactions. Dysregulation of protein citrullination has been associated with disease development and progression. Identification and characterization of citrullinated proteins is highly challenging, complicated by the low cellular abundance of citrullinated proteins, making it difficult to identify and quantify the extent of citrullination in samples, coupled with challenges associated with development of mass spectrometry (MS)-based methods, as the corresponding mass shift is relatively small, +0.984 Da, and identical to the mass shift of deamidation. The focus of this review is to discuss recent advancements of citrullination-specific MS approaches and integration of the potential methodology for improved citrullination identification and characterization. In addition, the association of citrullination in disease networks is also highlighted.
Collapse
Affiliation(s)
- Bin Wang
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, 53705, United States
| | - Lauren Fields
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, 53706, United States
| | - Lingjun Li
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, 53705, United States
- Department of Chemistry, University of Wisconsin-Madison, Madison, WI, 53706, United States
- Lachman Institute for Pharmaceutical Development, School of Pharmacy, University of Wisconsin-Madison, Madison, WI 53705, United States
| |
Collapse
|
4
|
Zhu D, Lu Y, Wang Y, Wang Y. PAD4 and Its Inhibitors in Cancer Progression and Prognosis. Pharmaceutics 2022; 14:2414. [PMID: 36365233 PMCID: PMC9699117 DOI: 10.3390/pharmaceutics14112414] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Revised: 10/28/2022] [Accepted: 11/06/2022] [Indexed: 07/24/2023] Open
Abstract
The systemic spread of malignancies and the risk of cancer-associated thrombosis are major clinical challenges in cancer therapy worldwide. As an important post-translational modification enzyme, peptidyl arginine deiminase 4 (PAD4) could mediate the citrullination of protein in different components (including nucleus and cytoplasm, etc.) of a variety of cells (tumor cells, neutrophils, macrophages, etc.), thus participating in gene regulation, neutrophil extracellular trap (NET) and macrophage extracellular trap (MET). Thereby, PAD4 plays an important role in enhancing the growth of primary tumors and facilitating the distant metastasis of cancer cells. In addition, it is related to the formation of cancer-associated thrombosis. Therefore, the development of PAD4-specific inhibitors may be a promising strategy for treating cancer, and it may improve patient prognosis. In this review, we describe PAD4 involvement in gene regulation, protein citrullination, and NET formation. We also discuss its potential role in cancer and cancer-associated thrombosis, and we summarize the development and application of PAD4 inhibitors.
Collapse
Affiliation(s)
- Di Zhu
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences of Capital Medical University, Beijing 100069, China
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, Beijing 100069, China
| | - Yu Lu
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences of Capital Medical University, Beijing 100069, China
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, Beijing 100069, China
| | - Yanming Wang
- School of Life Sciences, Henan University, Kaifeng 475004, China
| | - Yuji Wang
- Department of Medicinal Chemistry, College of Pharmaceutical Sciences of Capital Medical University, Beijing 100069, China
- Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, Beijing Laboratory of Biomedical Materials, Beijing 100069, China
| |
Collapse
|
5
|
Shinzato A, Kinjo T, Miyagi T, Yamazato S, Kaneku K, Nishiyama M, Miyagi K, Furugen M, Fujita J. Hypertrophic pulmonary osteoarthropathy due to lung cancer: A case report and literature review. Clin Case Rep 2020; 8:3510-3514. [PMID: 33363962 PMCID: PMC7752478 DOI: 10.1002/ccr3.3481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 10/07/2020] [Accepted: 10/12/2020] [Indexed: 11/13/2022] Open
Abstract
Hypertrophic pulmonary osteoarthropathy (HPOA) is a rare paraneoplastic syndrome. Our literature review shows the location of arthralgia and existence of edema are referable information for the differential diagnosis in paraneoplastic arthralgia.
Collapse
Affiliation(s)
- Akira Shinzato
- Department of Infectious, Respiratory, and Digestive MedicineGraduate School of MedicineUniversity of the RyukyusNishiharaJapan
| | - Takeshi Kinjo
- Department of Infectious, Respiratory, and Digestive MedicineGraduate School of MedicineUniversity of the RyukyusNishiharaJapan
| | - Taiga Miyagi
- Department of Infectious, Respiratory, and Digestive MedicineGraduate School of MedicineUniversity of the RyukyusNishiharaJapan
| | - Shoshin Yamazato
- Department of Infectious, Respiratory, and Digestive MedicineGraduate School of MedicineUniversity of the RyukyusNishiharaJapan
| | - Kozue Kaneku
- Department of Infectious, Respiratory, and Digestive MedicineGraduate School of MedicineUniversity of the RyukyusNishiharaJapan
| | - Mao Nishiyama
- Department of Infectious, Respiratory, and Digestive MedicineGraduate School of MedicineUniversity of the RyukyusNishiharaJapan
| | - Kazuya Miyagi
- Department of Infectious, Respiratory, and Digestive MedicineGraduate School of MedicineUniversity of the RyukyusNishiharaJapan
| | - Makoto Furugen
- Department of Infectious, Respiratory, and Digestive MedicineGraduate School of MedicineUniversity of the RyukyusNishiharaJapan
| | - Jiro Fujita
- Department of Infectious, Respiratory, and Digestive MedicineGraduate School of MedicineUniversity of the RyukyusNishiharaJapan
| |
Collapse
|
6
|
Neutrophil extracellular traps-associated protein peptidyl arginine deaminase 4 immunohistochemical expression in ulcerative colitis and its association with the prognostic predictors. Pathol Res Pract 2020; 216:153102. [PMID: 32853943 DOI: 10.1016/j.prp.2020.153102] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 06/27/2020] [Accepted: 07/05/2020] [Indexed: 02/06/2023]
Abstract
Neutrophil extracellular traps (NETs) are incriminated in several immune and inflammatory diseases including ulcerative colitis (UC). Analysis of colonic tissues for NETs-related markers in UC carries prognostic and therapeutic implications. This work aims to evaluate the immunohistochemical (IHC) expression of NETs-associated-protein arginine deaminase 4 (PAD4) in colonic biopsies from UC patients in comparison to normal colon (NC). Association between PAD4 expression level and histopathologic grade, patient's therapeutic response and other clinicopathological prognostic predictors in UC are determined. This cohort study included biopsies from 42 UC patients and 11 NC controls. Clinicopathological data including patient's age at diagnosis, gender, presenting symptoms, anatomical disease extent, extra-intestinal manifestations, type and response to therapy and surgical interventions were recorded and tabulated. Histopathological grading of disease activity and associated epithelial changes were assessed. PAD4 immunostaining was conducted using Horseradish Peroxidase technique and scored semiquantitatively considering intensity and percentage of nuclear staining of lamina propria inflammatory cells. Appropriate statistical tests were applied. Anti-PAD4 was localized mainly in the nuclei of lamina propria infiltrating neutrophils. It was expressed more significantly in UC (95.2 %) compared to NC (p 0.001). Increased PAD4 expression level was significantly associated with increasing histopathologic grade, anatomical disease extent, lacking response to therapy and subjection to radical surgery (p:0.001, = 0.038, 0.046, 0.046 respectively). Age, gender, presenting symptoms, extra-intestinal manifestations and epithelial changes showed insignificant associations. This study characterizes a subset of UC patients with high histopathological grade of activity, pancolonic involvement, strong/moderate PAD4 expression levels and who are unresponsive to routine medical therapeutic regimens rendering them candidates for radical surgery. In conjunction with histopathological grading, IHC evaluation of PAD4 in UC is recommended to guide patient's selection for targeted therapy using the novel-discovered selective PAD4 inhibitors.
Collapse
|
7
|
Galectin-9 Is a Possible Promoter of Immunopathology in Rheumatoid Arthritis by Activation of Peptidyl Arginine Deiminase 4 (PAD-4) in Granulocytes. Int J Mol Sci 2019; 20:ijms20164046. [PMID: 31430907 PMCID: PMC6721145 DOI: 10.3390/ijms20164046] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 08/12/2019] [Accepted: 08/16/2019] [Indexed: 12/14/2022] Open
Abstract
The aetiology of rheumatoid arthritis (RA) is unknown, but citrullination of proteins is thought to be an initiating event. In addition, it is increasingly evident that the lung can be a potential site for the generation of autoimmune triggers before the development of joint disease. Here, we identified that serum levels of galectin-9 (Gal-9), a pleiotropic immunomodulatory protein, are elevated in RA patients, and are even further increased in patients with comorbid bronchiectasis, a lung disease caused by chronic inflammation. The serum concentrations of Gal-9 correlate with C-reactive protein levels and DAS-28 score. Gal-9 activated polymorphonuclear leukocytes (granulocytes) in vitro, which was characterized by increased cytokine secretion, migration, and survival. Further, granulocytes treated with Gal-9 upregulated expression of peptidyl arginine deiminase 4 (PAD-4), a key enzyme required for RA-associated citrullination of proteins. Correspondingly, treatment with Gal-9 triggered citrullination of intracellular granulocyte proteins that are known contributors to RA pathogenesis (i.e., myeloperoxidase, alpha-enolase, MMP-9, lactoferrin). In conclusion, this study identifies for the first time an immunomodulatory protein, Gal-9, that triggers activation of granulocytes leading to increased PAD-4 expression and generation of citrullinated autoantigens. This pathway may represent a potentially important mechanism for development of RA.
Collapse
|
8
|
Hutchinson D, Müller J, McCarthy JE, Gun'ko YK, Verma NK, Bi X, Di Cristo L, Kickham L, Movia D, Prina-Mello A, Volkov Y. Cadmium nanoparticles citrullinate cytokeratins within lung epithelial cells: cadmium as a potential cause of citrullination in chronic obstructive pulmonary disease. Int J Chron Obstruct Pulmon Dis 2018; 13:441-449. [PMID: 29430177 PMCID: PMC5797466 DOI: 10.2147/copd.s152028] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Objective The objective of the study was to determine whether the cadmium-derived materials induce intracellular protein citrullination. Methods Human A549 lung epithelial cells were exposed to cadmium in soluble and nanoparticulate forms represented by cadmium chloride (CdCl2) and cadmium oxide (CdO), respectively, and their combinations with ultrafine carbon black (ufCB) produced by high temperature combustion, imitating cigarette burning. Protein citrullination in cell lysates was analyzed by Western immunoblotting and verified by immunofluorescent confocal microscopy. Target citrullinated proteins were identified by proteomic analysis. Results CdO, ufCB and its combination with CdCl2 and CdO after high temperature combustion induced protein citrullination in cultured human lung epithelial cells, as detected by immunoblotting with anti-citrullinated protein antibody. Cytokeratins of type II (1, 2, 5, 6A, 6B and 77) and type I (9, 10) were identified as major intracellular citrullination targets. Immunofluorescent staining confirmed the localization of citrullinated proteins both in the cytoplasm and cell nuclei. Conclusion Cadmium oxide nanoparticle exposure facilitated post-translational citrullination of proteins.
Collapse
Affiliation(s)
- David Hutchinson
- Royal Cornwall Hospital NHS Trust, Treliske.,University of Exeter Medical School Cornwall, UK
| | | | | | - Yurii K Gun'ko
- School of Chemistry.,Advanced Materials for BioEngineering Research Centre (AMBER), Trinity College Dublin, Dublin, Ireland
| | | | - Xuezhi Bi
- Bioprocessing Technology Institute, ASTAR Graduate Academy, Singapore
| | - Luisana Di Cristo
- Department of Clinical Medicine, School of Medicine, Trinity College Dublin, Dublin, Ireland
| | - Laura Kickham
- Department of Clinical Medicine, School of Medicine, Trinity College Dublin, Dublin, Ireland
| | - Dania Movia
- Department of Clinical Medicine, School of Medicine, Trinity College Dublin, Dublin, Ireland
| | - Adriele Prina-Mello
- Advanced Materials for BioEngineering Research Centre (AMBER), Trinity College Dublin, Dublin, Ireland.,Department of Clinical Medicine, School of Medicine, Trinity College Dublin, Dublin, Ireland
| | - Yuri Volkov
- Advanced Materials for BioEngineering Research Centre (AMBER), Trinity College Dublin, Dublin, Ireland.,Department of Clinical Medicine, School of Medicine, Trinity College Dublin, Dublin, Ireland.,International Laboratory of Magnetically Controlled Nanosystems for Theranostics of Oncological and Cardiovascular Diseases, ITMO University, St. Petersburg, Russia
| |
Collapse
|
9
|
Induction of protein citrullination and auto-antibodies production in murine exposed to nickel nanomaterials. Sci Rep 2018; 8:679. [PMID: 29330439 PMCID: PMC5766588 DOI: 10.1038/s41598-017-19068-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Accepted: 12/21/2017] [Indexed: 11/18/2022] Open
Abstract
Citrullination, or the post-translational deimination of polypeptide-bound arginine, is involved in several pathological processes in the body, including autoimmunity and tumorigenesis. Recent studies have shown that nanomaterials can trigger protein citrullination, which might constitute a common pathogenic link to disease development. Here we demonstrated auto-antibody production in serum of nanomaterials-treated mice. Citrullination-associated phenomena and PAD levels were found to be elevated in nanomaterials -treated cell lines as well as in the spleen, kidneys and lymph nodes of mice, suggesting a systemic response to nanomaterials injection, and validated in human pleural and pericardial malignant mesothelioma (MM) samples. The observed systemic responses in mice exposed to nanomaterials support the evidence linking exposure to environmental factors with the development of autoimmunity responses and reinforces the need for comprehensive safety screening of nanomaterials. Furthermore, these nanomaterials induce pathological processes that mimic those observed in Pleural MM, and therefore require further investigations into their carcinogenicity.
Collapse
|
10
|
Samara KD, Trachalaki A, Tsitoura E, Koutsopoulos AV, Lagoudaki ED, Lasithiotaki I, Margaritopoulos G, Pantelidis P, Bibaki E, Siafakas NM, Tzanakis N, Wells AU, Antoniou KM. Upregulation of citrullination pathway: From Autoimmune to Idiopathic Lung Fibrosis. Respir Res 2017; 18:218. [PMID: 29287593 PMCID: PMC5747943 DOI: 10.1186/s12931-017-0692-9] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 12/02/2017] [Indexed: 12/31/2022] Open
Abstract
Background Increased protein citrullination and peptidylarginine deiminases (PADIs), which catalyze the citrullination process, are central in Rheumatoid arthritis pathogenesis and probably involved in the initial steps towards autoimmunity. Approximately, 10% of RA patients develop clinically significantly ILD. A possible shared role of protein citrullination in rheumatoid arthritis associated interstitial lung disease (RA-ILD), and idiopathic pulmonary fibrosis (IPF) pathogenesis remains unclear. Methods We evaluated PADI2 and PADI4 mRNA expression in bronchoalveolar lavage fluid (BALF) cells of 59 patients with IPF, 27 patients RA-ILD and 10 healthy controls. PADI 2 and 4 expression was analyzed by western blot and immunohistochemistry. Citrullinated protein levels were also quantified. Results PADI4 mRNA and protein levels were higher in RA-ILD and IPF than controls. Furthermore, PADI4 mRNA levels showed an increase among smokers in RA-ILD. PADI4 expression was detected in granulocytes and macrophages in all groups, with the strongest cytoplasmic expression observed in granulocytes in RA-ILD and IPF. PADI2 mRNA and immunostaining of BAL cells, were similar in all groups among smokers. Overall, stronger staining was observed in current smokers. Citrullinated peptides were significantly increased in IPF compared to RA-ILD and controls. In RA-ILD, protein citrullination strongly correlated with PADI4 expression and anti-citrullinated protein antibodies (ACPAs). Conclusions These results suggest that the citrullination pathway is upregulated in IPF and in RA-ILD. Electronic supplementary material The online version of this article (10.1186/s12931-017-0692-9) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Katerina D Samara
- Department of Thoracic Medicine and Laboratory of Molecular and Cellular Pneumonology, Medical School, University of Crete, Heraklion, Crete, Greece.,Interstitial Lung Disease Unit, Royal Brompton Hospital, Imperial College, London, SW3 6NP, UK
| | - Athina Trachalaki
- Department of Thoracic Medicine and Laboratory of Molecular and Cellular Pneumonology, Medical School, University of Crete, Heraklion, Crete, Greece
| | - Eliza Tsitoura
- Department of Thoracic Medicine and Laboratory of Molecular and Cellular Pneumonology, Medical School, University of Crete, Heraklion, Crete, Greece
| | - Anastasios V Koutsopoulos
- Department of Pathology, Medical School, University of Crete and Heraklion University Hospital, Heraklion, Crete, Greece
| | - Eleni D Lagoudaki
- Department of Pathology, Medical School, University of Crete and Heraklion University Hospital, Heraklion, Crete, Greece
| | - Ismini Lasithiotaki
- Department of Thoracic Medicine and Laboratory of Molecular and Cellular Pneumonology, Medical School, University of Crete, Heraklion, Crete, Greece
| | - George Margaritopoulos
- Interstitial Lung Disease Unit, Royal Brompton Hospital, Imperial College, London, SW3 6NP, UK
| | - Panagiotis Pantelidis
- Interstitial Lung Disease Unit, Royal Brompton Hospital, Imperial College, London, SW3 6NP, UK
| | - Eleni Bibaki
- Department of Thoracic Medicine and Laboratory of Molecular and Cellular Pneumonology, Medical School, University of Crete, Heraklion, Crete, Greece
| | - Nikolaos M Siafakas
- Department of Thoracic Medicine and Laboratory of Molecular and Cellular Pneumonology, Medical School, University of Crete, Heraklion, Crete, Greece
| | - Nikolaos Tzanakis
- Department of Thoracic Medicine and Laboratory of Molecular and Cellular Pneumonology, Medical School, University of Crete, Heraklion, Crete, Greece
| | - Athol U Wells
- Interstitial Lung Disease Unit, Royal Brompton Hospital, Imperial College, London, SW3 6NP, UK
| | - Katerina M Antoniou
- Department of Thoracic Medicine and Laboratory of Molecular and Cellular Pneumonology, Medical School, University of Crete, Heraklion, Crete, Greece.
| |
Collapse
|
11
|
Bidkar M, Vassallo R, Luckey D, Smart M, Mouapi K, Taneja V. Cigarette Smoke Induces Immune Responses to Vimentin in both, Arthritis-Susceptible and -Resistant Humanized Mice. PLoS One 2016; 11:e0162341. [PMID: 27602574 PMCID: PMC5014446 DOI: 10.1371/journal.pone.0162341] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Accepted: 08/22/2016] [Indexed: 12/29/2022] Open
Abstract
Rheumatoid arthritis (RA) is an autoimmune disease marked by chronic synovial inflammation and both, genetic and environmental factors are involved in its pathogenesis. Human leukocyte antigen (HLA) DRB1*0401 is associated with susceptibility to develop RA, while cigarette smoke (CS) exposure promotes seropositive disease with increased severity in DRB1*0401+ individuals. Smokers have higher levels of antibodies against citrullinated peptides. In this study, we determined whether the response to a known autoantigen, Vimentin (Vim) is shared epitope specific and how CS influences this response using transgenic-mice carrying RA-susceptible,*0401, and -resistant, *0402, genes. Following relatively brief exposure to CS, peptidyl arginine deiminase (PAD) enzyme expression was increased in murine lungs. Cigarette smoking led to production of Interferon (IFN)-γ with reduced levels of Interleukin (IL)-10 by splenocytes of *0401 mice. In contrast, CS augmented Th2 cytokines along with T-regulatory cells in *0402 mice. An increase in levels of antibodies to native and citrullinated Vim was observed in naïve mice of both strains following CS exposure. Our data showed that both arthritis-susceptible and -resistant mice can generate cellular and humoral immunity to Vim; however CS-induced modulation of host immunity is dependent on the interaction with the host HLA genes.
Collapse
Affiliation(s)
- Mitali Bidkar
- Department of Immunology, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Robert Vassallo
- Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
| | - David Luckey
- Department of Immunology, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Michele Smart
- Department of Immunology, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Kelly Mouapi
- Department of Immunology, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Veena Taneja
- Department of Immunology, Mayo Clinic, Rochester, Minnesota, United States of America
- Division of Rheumatology, Mayo Clinic, Rochester, Minnesota, United States of America
- * E-mail:
| |
Collapse
|
12
|
Duan Q, Pang C, Chang N, Zhang J, Liu W. Overexpression of PAD4 suppresses drug resistance of NSCLC cell lines to gefitinib through inhibiting Elk1-mediated epithelial-mesenchymal transition. Oncol Rep 2016; 36:551-8. [PMID: 27176594 DOI: 10.3892/or.2016.4780] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 02/11/2016] [Indexed: 11/05/2022] Open
Abstract
It is reported that epithelial-to-mesenchymal transition (EMT) could induce resistance in tumor cells, and knockdown of peptidylarginine deiminase IV (PAD4) induces the activity of EMT. However, the role of PAD4 in gefitinib‑acquired resistance in non-small cell lung cancer (NSCLC) remains unclear. In this study, we aimed to investigate the role of PAD4 in the resistance of NSCLC to gefitinib. The cells resistant to gefitinib were established in accordance with the literature, and were derived from NSCLC cell lines HCC827 and H1650. Real-time quantitative PCR and western blot results showed that PAD4 was obviously downregulated in the cells resistant to gefitinib. Overexpression of PAD4 distinctly inhibited gefitinib resistance, whereas PAD4 downregulation had the opposite effect. Further data indicated that PAD4 upregulation could restrain EMT activity via controlling the expression of ETS-domain containing protein (Elk1). Conversely, inhibition of PAD4 showed the reverse function compared with PAD4 upregulation. Above all, our study showed that overexpression of PAD4 constrains the activity of EMT via suppressing Elk1 expression, and inhibits resistance of NSCLC to gefitinib.
Collapse
Affiliation(s)
- Qiong Duan
- Department of Oncology, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Cui Pang
- Department of Oncology, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Ning Chang
- Department of Respiratory Medicine, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Ju Zhang
- Institute of Gene Diagnosis, State Key Laboratory of Cancer Biology, School of Pharmacology, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| | - Wenchao Liu
- Department of Oncology, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi 710032, P.R. China
| |
Collapse
|
13
|
Demoruelle MK, Solomon JJ, Fischer A, Deane KD. The lung may play a role in the pathogenesis of rheumatoid arthritis. ACTA ACUST UNITED AC 2014; 9:295-309. [PMID: 26089988 DOI: 10.2217/ijr.14.23] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Multiple studies have identified strong associations between the lung and rheumatoid arthritis (RA). Such studies identify a high prevalence of lung disease, both airways and parenchymal disease, in subjects with clinically classifiable RA. It has been suggested that lung disease in RA results from targeting of the lung from circulating autoimmunity or other factors such as medications. However, findings that lung disease, specifically inflammatory airways disease, and lung generation of autoimmunity can be present before the onset of joint symptoms suggest that immune reactions in the lung may be involved in the initial development of RA-related autoimmunity. Herein we review these issues in detail, as well as outline a potential research agenda to understand the natural history of lung involvement in RA and its relation to the overall pathogenesis of RA.
Collapse
Affiliation(s)
- M Kristen Demoruelle
- University of Colorado School of Medicine, Aurora, CO, USA ; National Jewish Health, Denver, CO, USA
| | | | - Aryeh Fischer
- University of Colorado School of Medicine, Aurora, CO, USA ; National Jewish Health, Denver, CO, USA
| | - Kevin D Deane
- University of Colorado School of Medicine, Aurora, CO, USA
| |
Collapse
|
14
|
Perry E, Kelly C, Eggleton P, De Soyza A, Hutchinson D. The lung in ACPA-positive rheumatoid arthritis: an initiating site of injury? Rheumatology (Oxford) 2014; 53:1940-50. [DOI: 10.1093/rheumatology/keu195] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
|
15
|
Autoantibodies to posttranslational modifications in rheumatoid arthritis. Mediators Inflamm 2014; 2014:492873. [PMID: 24782594 PMCID: PMC3981057 DOI: 10.1155/2014/492873] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 02/10/2014] [Indexed: 12/11/2022] Open
Abstract
Autoantibodies have been associated with human pathologies for a long time, particularly with autoimmune diseases (AIDs). Rheumatoid factor (RF) is known since the late 1930s to be associated with rheumatoid arthritis (RA). The discovery of anticitrullinated protein antibodies in the last century has changed this and other posttranslational modifications (PTM) relevant to RA have since been described. Such PTM introduce neoepitopes in proteins that can generate novel autoantibody specificities. The recent recognition of these novel specificities in RA provides a unique opportunity to understand human B-cell development in vivo. In this paper, we will review the three of the main classes of PTMs already associated with RA: citrullination, carbamylation, and oxidation. With the advancement of research methodologies it should be expected that other autoantibodies against PTM proteins could be discovered in patients with autoimmune diseases. Many of such autoantibodies may provide significant biomarker potential.
Collapse
|
16
|
de Hair MJH, van de Sande MGH, Ramwadhdoebe TH, Hansson M, Landewé R, van der Leij C, Maas M, Serre G, van Schaardenburg D, Klareskog L, Gerlag DM, van Baarsen LGM, Tak PP. Features of the synovium of individuals at risk of developing rheumatoid arthritis: implications for understanding preclinical rheumatoid arthritis. Arthritis Rheumatol 2014; 66:513-22. [PMID: 24574210 PMCID: PMC4034588 DOI: 10.1002/art.38273] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Accepted: 11/05/2013] [Indexed: 12/25/2022]
Abstract
OBJECTIVE Findings from previous studies have suggested that subclinical inflammation of the synovium does not coincide with the appearance of rheumatoid arthritis (RA)-specific autoantibodies. This study was undertaken to examine the relationship between the presence of autoantibodies, changes in the synovium, and development of arthritis over time in a markedly larger, prospective study. METHODS Fifty-five individuals who were IgM rheumatoid factor positive and/or anti-citrullinated protein antibody (ACPA) positive (detected by the anti-cyclic citrullinated peptide antibody test) and who were without any evidence of arthritis upon physical examination were included in the study. ACPAs were subsequently also detected using a multiplex chip-based assay. All individuals underwent magnetic resonance imaging and mini-arthroscopic synovial biopsy sampling of a knee joint at inclusion and were prospectively followed up. Proportional hazards regression analysis was performed to investigate whether changes in the synovium were associated with the onset of arthritis. RESULTS Fifteen individuals (27%) developed arthritis after a median followup time of 13 months (interquartile range 6-27 months; range 1-47 months). No overt synovial inflammation was observed, but CD3+ T cell numbers in the biopsy tissue showed a borderline association with subsequent development of clinically manifest arthritis (hazard ratio 2.8, 95% confidence interval [95% CI] 0.9-9.1; P = 0.088). In addition, the presence of CD8+ T cells was associated with ACPA positivity (odds ratio [OR] 16.0, 95% CI 1.7-151.1) and with the total number of ACPAs present (OR 1.4, 95% CI 1.0-1.8). CONCLUSION These findings confirm and extend previous results showing the absence of clearcut synovial inflammation in individuals having systemic autoimmunity associated with RA. However, subtle infiltration by synovial T cells may precede the signs and symptoms of arthritis in preclinical RA.
Collapse
Affiliation(s)
- MJH de Hair
- Academic Medical Center and University of AmsterdamAmsterdam, The Netherlands
| | - MGH van de Sande
- Academic Medical Center and University of AmsterdamAmsterdam, The Netherlands
| | - TH Ramwadhdoebe
- Academic Medical Center and University of AmsterdamAmsterdam, The Netherlands
| | - M Hansson
- Karolinska Institute and Karolinska University HospitalSolna, Stockholm, Sweden
| | - R Landewé
- Academic Medical Center and University of Amsterdam, Amsterdam, The Netherlands, and Atrium Medical CenterHeerlen, The Netherlands
| | - C van der Leij
- Academic Medical Center and University of AmsterdamAmsterdam, The Netherlands
| | - M Maas
- Academic Medical Center and University of AmsterdamAmsterdam, The Netherlands
| | - G Serre
- Toulouse III UniversityToulouse, France
| | | | - L Klareskog
- Karolinska Institute and Karolinska University HospitalSolna, Stockholm, Sweden
| | - DM Gerlag
- Academic Medical Center and University of Amsterdam, Amsterdam, The Netherlands, GlaxoSmithKline, Stevenage, UK, and University of CambridgeCambridge, UK
| | - LGM van Baarsen
- Academic Medical Center and University of AmsterdamAmsterdam, The Netherlands
| | - PP Tak
- Academic Medical Center and University of Amsterdam, Amsterdam, The Netherlands, GlaxoSmithKline, Stevenage, UK, and University of CambridgeCambridge, UK
| |
Collapse
|
17
|
Jiang Z, Cui Y, Wang L, Zhao Y, Yan S, Chang X. Investigating citrullinated proteins in tumour cell lines. World J Surg Oncol 2013; 11:260. [PMID: 24099319 PMCID: PMC3851430 DOI: 10.1186/1477-7819-11-260] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Accepted: 09/27/2013] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND The conversion of arginine into citrulline, termed citrullination, has important consequences for the structure and function of proteins. Studies have found PADI4, an enzyme performing citrullination, to be highly expressed in a variety of malignant tumours and have shown that PADI4 participates in the process of tumorigenesis. However, as citrullinated proteins have not been systematically investigated in tumours, the present study aimed to identify novel citrullinated proteins in tumours by 2-D western blotting (2-D WB). METHODS Two identical two-dimensional electrophoresis (2-DE) gels were prepared using extracts from ECA, H292, HeLa, HEPG2, Lovo, MCF-7, PANC-1, SGC, and SKOV3 tumour cell lines. The expression profiles on a 2-DE gel were trans-blotted to PVDF membranes, and the blots were then probed with an anti-citrulline antibody. By comparing the 2-DE profile with the parallel 2-D WB profile at a global level, protein spots with immuno-signals were collected from the second 2-DE gel and identified using mass spectrometry. Immunoprecipitation was used to verify the expression and citrullination of the targeted proteins in tumour cell lines. RESULTS 2-D WB and mass spectrometry identified citrullinated α-enolase (ENO1), heat shock protein 60 (HSP60), keratin 8 (KRT8), tubulin beta (TUBB), T cell receptor chain and vimentin in these cell lines. Immunoprecipitation analyses verified the expression and citrullination of ENO1, HSP60, KRT8, and TUBB in the total protein lysates of the tumour cell lines. CONCLUSIONS The citrullination of these proteins suggests a new mechanism in the tumorigenic process.
Collapse
Affiliation(s)
- Zhongmin Jiang
- Medical Research Center of Qianfoshan Hospital, Shandong University, Jingshi Road 16766, Jinan, Shandong 250014, P.R. China
| | - Yazhou Cui
- Biomedical Research Center, Shandong Academy of Medical Sciences, Jingshi Road 18877, Jinan, Shandong 250062, P.R. China
| | - Lin Wang
- Biomedical Research Center, Shandong Academy of Medical Sciences, Jingshi Road 18877, Jinan, Shandong 250062, P.R. China
| | - Yan Zhao
- Biomedical Research Center, Shandong Academy of Medical Sciences, Jingshi Road 18877, Jinan, Shandong 250062, P.R. China
| | - Suhua Yan
- Medical Research Center of Qianfoshan Hospital, Shandong University, Jingshi Road 16766, Jinan, Shandong 250014, P.R. China
| | - Xiaotian Chang
- Medical Research Center of Qianfoshan Hospital, Shandong University, Jingshi Road 16766, Jinan, Shandong 250014, P.R. China
| |
Collapse
|
18
|
Giles JT, Danoff SK, Sokolove J, Wagner CA, Winchester R, Pappas DA, Siegelman S, Connors G, Robinson WH, Bathon JM. Association of fine specificity and repertoire expansion of anticitrullinated peptide antibodies with rheumatoid arthritis associated interstitial lung disease. Ann Rheum Dis 2013; 73:1487-94. [PMID: 23716070 DOI: 10.1136/annrheumdis-2012-203160] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Interstitial lung disease (ILD) is associated with high morbidity and mortality in rheumatoid arthritis (RA). Citrullinated proteins are observed in RA lung tissues; however, the association of specific anticitrullinated peptide antibodies (ACPA) with ILD in RA is unknown. METHODS RA patients underwent multidetector CT (MDCT) of the chest, from which ILD features and a semiquantitative ILD Score (ILDS; range 0-32) were assessed. Anti-CCP (CCP2) and levels of a panel of antibodies against 17 citrullinated and four non-citrullinated peptides were assessed from concurrent serum samples using a custom Bio-Plex bead array. High level ACPA was defined as ≥the group 75th percentile. RESULTS Among the 177 RA patients studied, median levels of CCP2 and all specific ACPAs were 46-273% higher among RA patients with versus those without ILD (all p values <0.05), and higher levels correlated with higher ILDS. In contrast, levels of non-citrullinated protein antibodies were not higher in those with ILD. RA patients had a median of 2 high level ACPA reactivities (range 0-16), with each high level ACPA associated, on average, with a 0.10 unit higher ILDS (p=0.001). This association remained significant after adjusting for characteristics associated with ILD (age, gender, current and former smoking, Disease Activity Score for 28 joints, current prednisone and leflunomide use). More high level ACPA were observed in those with versus without pulmonary function restriction or impaired diffusion. CONCLUSIONS Our findings of a broader ACPA repertoire in RA ILD suggest a possible role for ACPA in the pathogenesis of ILD.
Collapse
Affiliation(s)
- Jon T Giles
- Division of Rheumatology, Columbia University, College of Physicians and Surgeons, New York, New York, USA
| | - Sonye K Danoff
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Jeremy Sokolove
- Veterans Administration Palo Alto Health Care System, Palo Alto, California, USA Division of Rheumatology, Stanford University, Stanford, California, USA
| | - Catriona A Wagner
- Veterans Administration Palo Alto Health Care System, Palo Alto, California, USA Division of Rheumatology, Stanford University, Stanford, California, USA
| | - Robert Winchester
- Division of Rheumatology, Columbia University, College of Physicians and Surgeons, New York, New York, USA
| | - Dimitrios A Pappas
- Division of Rheumatology, Columbia University, College of Physicians and Surgeons, New York, New York, USA
| | - Stanley Siegelman
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Geoff Connors
- Division of Pulmonary and Critical Care Medicine, Yale University, New Haven, Connecticut, USA
| | - William H Robinson
- Veterans Administration Palo Alto Health Care System, Palo Alto, California, USA Division of Rheumatology, Stanford University, Stanford, California, USA
| | - Joan M Bathon
- Division of Rheumatology, Columbia University, College of Physicians and Surgeons, New York, New York, USA
| |
Collapse
|
19
|
Misják P, Bősze S, Horváti K, Pásztói M, Pálóczi K, Holub MC, Szakács F, Aradi B, György B, Szabó TG, Nagy G, Glant TT, Mikecz K, Falus A, Buzás EI. The role of citrullination of an immunodominant proteoglycan (PG) aggrecan T cell epitope in BALB/c mice with PG-induced arthritis. Immunol Lett 2013; 152:25-31. [PMID: 23578666 DOI: 10.1016/j.imlet.2013.03.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Revised: 03/10/2013] [Accepted: 03/27/2013] [Indexed: 12/30/2022]
Abstract
The P70-84 peptide (also called 5/4E8 epitope) of the human cartilage proteoglycan (PG) aggrecan is the dominant/arthritogenic epitope in both humans and arthritis-prone BALB/c mice (PG-induced arthritis, PGIA). An elevated T cell reactivity was demonstrated to a citrullinated version of the P70-84 epitope in most of the patients with rheumatoid arthritis (RA). The goal of this study was to understand better how a T cell epitope, if citrullinated, may affect antigenicity/arthritogenicity in PGIA, a murine model of RA. T cell reactivity to differentially citrullinated versions of either the human PG aggrecan P70-84 peptide or the corresponding mouse sequence was assessed in peptide or aggrecan-immunized and arthritic BALB/c mice as well as in T cell receptor transgenic mice specific for peptide P70-84 sequence. Peripheral T cell responses were induced by priming BALB/c mice with either the human wild-type or its citrullinated versions. Unexpectedly, priming with the citrullinated self-peptide induced a higher T cell response compared to the wild-type sequence (p<0.001), and the citrullination of the human peptide abolished T cell reactivity in PGIA. Our data suggest that T cells reactive to the citrullinated P70-84 peptide escaped thymic selection and are present in the peripheral T cell repertoire. Results of this study provide evidence that citrullination of an immunodominant T cell epitope may substantially alter, either increase or abolish, T cell recognition at the periphery in an experimental model of arthritis.
Collapse
Affiliation(s)
- Petra Misják
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Baka Z, György B, Géher P, Buzás EI, Falus A, Nagy G. Citrullination under physiological and pathological conditions. Joint Bone Spine 2012; 79:431-6. [PMID: 22366145 DOI: 10.1016/j.jbspin.2012.01.008] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2011] [Accepted: 01/12/2012] [Indexed: 12/19/2022]
Abstract
Citrullination, one of the enzymatic posttranslational modifications has become a hot topic of recent research as it is involved in various physiological and pathological processes. Antibodies against citrullinated proteins called anti-citrullinated protein antibodies, are the hallmark (diagnostic and prognostic factors) of rheumatoid arthritis, and are specific for the disease. Citrullination has an important role in the normal function of the immune system, skin keratinization, the insulation of neurons and the plasticity of the central nervous system including its essential role in gene regulation. Abnormal citrullination has been proposed to play a role in multiple sclerosis and Alzheimer's disease, and recent research has drawn attention to its implication in tumorigenesis. Still, it is unclear whether citrullination is the cause or the consequence of these pathological alterations. Here, we discuss crucial aspects of citrullination during both physiological and pathological conditions.
Collapse
Affiliation(s)
- Zsuzsanna Baka
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary
| | | | | | | | | | | |
Collapse
|
21
|
Marengo MF, Suarez-Almazor ME, Lu H. Neoplastic and Paraneoplastic Synovitis. Rheum Dis Clin North Am 2011; 37:551-72. [DOI: 10.1016/j.rdc.2011.09.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
|