1
|
Mohammad Piri S, Amin Habibi M, Shool S, Khazaeli Najafabadi M, Ahmadpour S, Alemi F, Aria Nejadghaderi S, Shokri P, Abdi M, Asghari N, Amir Asef-Agah S, Tavakolpour S. Role of T follicular helper cells in autoimmune rheumatic Diseases: A systematic review on immunopathogenesis and response to treatment. Hum Immunol 2024; 85:110838. [PMID: 38970880 DOI: 10.1016/j.humimm.2024.110838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 06/09/2024] [Accepted: 06/28/2024] [Indexed: 07/08/2024]
Abstract
BACKGROUND T follicular helper (Tfh) cells are a subdivision of T helper cells involved in antigen-specific B cell immunity. Tfh cells play an essential role in the interaction of T cells/B cells in the germinal centers (GC), and dysregulation of Tfh actions can offer pathogenic autoantibody formation and lead to the development of autoimmune diseases. This study seeks to evaluate changes in Tfh frequency and its related cytokines in autoimmune disease, its association with disease phase, severity, prognosis, and the effect of immunosuppressive treatment on the Tfh population. METHOD The study adhered to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) 2020 Statement. Electronic databases, including PubMed, Scopus, Web of Science, and Embase, were systematically searched for potentially eligible studies up to January 1, 2024. RESULTS We identified 4998 articles in the initial search, from which 1686 similar titles were removed. A total of 3312 articles were initially screened, and 3051 articles were excluded by title/abstract screening. A total of 261 studies were considered for full-text assessment, and 205 articles were excluded by reason. Finally, a total of 56 studies were included in our review. CONCLUSION The population of Tfh cells is generally higher in autoimmune diseases versus Health control. Moreover, the number of Tfh cells is associated with the disease severity and can be considered for determining the prognosis of studies. Also, peripheral blood circulating Tfh (cTfh) cells are an available sample that can be used as an indicator for diagnosing diseases.
Collapse
Affiliation(s)
- Seyed Mohammad Piri
- Department of Pathology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.
| | - Mohammad Amin Habibi
- Department of Neurosurgery, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.
| | - Sina Shool
- Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | | | - Sajjad Ahmadpour
- Patient Safety Research Center, Clinical Research Institute, Urmia University of Medical Sciences, Urmia, Iran.
| | - Fakhroddin Alemi
- School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran.
| | - Seyed Aria Nejadghaderi
- Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Systematic Review and Meta-analysis Expert Group (SRMEG), Universal Scientific Education and Research Network (USERN), Tehran, Iran.
| | - Pourya Shokri
- Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Mohtaram Abdi
- Student Research Committe, Faculty of Medicine, North Khorasan University of Medical Sciences, Bonjnurd, Iran.
| | - Negin Asghari
- Student Research Committe, Faculty of Medicine, North Khorasan University of Medical Sciences, Bonjnurd, Iran.
| | - Seyed Amir Asef-Agah
- Student Research Committee, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
| | | |
Collapse
|
2
|
Lin CH, Talebian F, Yang L, Zhu J, Liu JQ, Zhao B, Basu S, Pan X, Chen X, Yan P, Carson WE, Xin G, Wen H, Wang R, Li Z, Ma Q, Bai XF. CD200R signaling contributes to unfavorable tumor microenvironment through regulating production of chemokines by tumor-associated myeloid cells. iScience 2023; 26:106904. [PMID: 37275530 PMCID: PMC10239067 DOI: 10.1016/j.isci.2023.106904] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 03/31/2023] [Accepted: 05/12/2023] [Indexed: 06/07/2023] Open
Abstract
CD200 is overexpressed in many solid tumors and considered as an immune checkpoint molecule dampening cancer immunity. In this study, we found that CD200R-/- mice were significantly more potent in rejecting these CD200+ tumors. scRNA sequencing demonstrated that tumors from CD200R-/- mice had more infiltration of CD4+ and CD8+ T cells, and NK cells but less infiltration of neutrophils. Antibody depletion experiments revealed that immune effector cells are crucial in inhibiting tumor growth in CD200R-/- mice. Mechanistically, we found that CD200R signaling regulates the expression of chemokines in tumor-associated myeloid cells (TAMCs). In the absence of CD200R, TAMCs increased expression of CCL24 and resulted in increased infiltration of eosinophils, which contributes to anti-tumor activity. Overall, we conclude that CD200R signaling contributes to unfavorable TME through chemokine-dependent recruitment of immune suppressive neutrophils and exclusion of anti-cancer immune effectors. Our study has implications in developing CD200-CD200R targeted immunotherapy of solid tumors.
Collapse
Affiliation(s)
- Cho-Hao Lin
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Fatemeh Talebian
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Li Yang
- Department of Biomedical Informatics, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Jianmin Zhu
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Jin-Qing Liu
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Bolin Zhao
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Sujit Basu
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Xueliang Pan
- Department of Biomedical Informatics, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Xi Chen
- Genomics Shared Resource, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Pearlly Yan
- Genomics Shared Resource, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - William E. Carson
- Department of Surgery, Division of Surgical Oncology, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
- Pelotonia Institute for Immuno-Oncology, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Gang Xin
- Pelotonia Institute for Immuno-Oncology, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
- Department of Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Haitao Wen
- Pelotonia Institute for Immuno-Oncology, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
- Department of Infection and Immunity, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Ruoning Wang
- Pelotonia Institute for Immuno-Oncology, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
- Department of Pediatrics, College of Medicine, The Ohio State University, Columbus, OH, USA
| | - Zihai Li
- Pelotonia Institute for Immuno-Oncology, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Qin Ma
- Department of Biomedical Informatics, College of Medicine, The Ohio State University, Columbus, OH, USA
- Pelotonia Institute for Immuno-Oncology, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| | - Xue-Feng Bai
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, USA
- Pelotonia Institute for Immuno-Oncology, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA
| |
Collapse
|
3
|
McLeish KR, Fernandes MJ. Understanding inhibitory receptor function in neutrophils through the lens of
CLEC12A. Immunol Rev 2022; 314:50-68. [PMID: 36424898 DOI: 10.1111/imr.13174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Neutrophils are the first leukocytes recruited from the circulation in response to invading pathogens or injured cells. To eradicate pathogens and contribute to tissue repair, recruited neutrophils generate and release a host of toxic chemicals that can also damage normal cells. To avoid collateral damage leading to tissue injury and organ dysfunction, molecular mechanisms evolved that tightly control neutrophil response threshold to activating signals, the strength and location of the response, and the timing of response termination. One mechanism of response control is interruption of activating intracellular signaling pathways by the 20 inhibitory receptors expressed by neutrophils. The two inhibitory C-type lectin receptors expressed by neutrophils, CLEC12A and DCIR, exhibit both common and distinct molecular and functional mechanisms, and they are associated with different diseases. In this review, we use studies on CLEC12A as a model of inhibitory receptor regulation of neutrophil function and participation in disease. Understanding the molecular mechanisms leading to inhibitory receptor specificity offers the possibility of using physiologic control of neutrophil functions as a pharmacologic tool to control inflammatory diseases.
Collapse
Affiliation(s)
- Kenneth R. McLeish
- Department of Medicine University of Louisville School of Medicine Louisville Kentucky USA
| | - Maria J. Fernandes
- Infectious and Immune Diseases Division CHU de Québec‐Laval University Research Center Québec Québec Canada
- Department of Microbiology‐Infectious Diseases and Immunology, Faculty of Medicine Laval University Québec Québec Canada
| |
Collapse
|
4
|
Macrophages transfer mitochondria to sensory neurons to resolve inflammatory pain. Neuron 2021; 110:613-626.e9. [PMID: 34921782 DOI: 10.1016/j.neuron.2021.11.020] [Citation(s) in RCA: 77] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 09/21/2021] [Accepted: 11/16/2021] [Indexed: 12/21/2022]
Abstract
The current paradigm is that inflammatory pain passively resolves following the cessation of inflammation. Yet, in a substantial proportion of patients with inflammatory diseases, resolution of inflammation is not sufficient to resolve pain, resulting in chronic pain. Mechanistic insight into how inflammatory pain is resolved is lacking. Here, we show that macrophages actively control resolution of inflammatory pain remotely from the site of inflammation by transferring mitochondria to sensory neurons. During resolution of inflammatory pain in mice, M2-like macrophages infiltrate the dorsal root ganglia that contain the somata of sensory neurons, concurrent with the recovery of oxidative phosphorylation in sensory neurons. The resolution of pain and the transfer of mitochondria requires expression of CD200 receptor (CD200R) on macrophages and the non-canonical CD200R-ligand iSec1 on sensory neurons. Our data reveal a novel mechanism for active resolution of inflammatory pain.
Collapse
|
5
|
Talebian F, Yu J, Lynch K, Liu JQ, Carson WE, Bai XF. CD200 Blockade Modulates Tumor Immune Microenvironment but Fails to Show Efficacy in Inhibiting Tumor Growth in a Murine Model of Melanoma. Front Cell Dev Biol 2021; 9:739816. [PMID: 34692697 PMCID: PMC8531493 DOI: 10.3389/fcell.2021.739816] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 09/20/2021] [Indexed: 01/14/2023] Open
Abstract
CD200-CD200R pathway regulates immune responses and has been implicated in the pathogenesis of a number of cancer types. CD200 blockade is considered a strategy for immunotherapy of CD200-positive cancers such as melanoma. Thus, it is critical to understand the potential impacts of CD200 blockade in a more human relevant tumor model. In this study, we evaluated these issues using the CD200+ Yumm1.7 mouse melanoma model. Yumm1.7 cells bear Braf/Pten mutations resembling human melanoma. We found that Yumm1.7 tumors grow significantly faster in CD200R–/– mice compared to wild type mice. Analysis of tumor immune microenvironment (TIME) revealed that tumors from CD200R–/– or anti-CD200 treated mice had downregulated immune cell contents and reduced TCR clonality compared to tumors from untreated wild type mice. T cells also showed impaired effector functions, as reflected by reduced numbers of IFN-γ+ and TNF-α+ T cells. Mechanistically, we found upregulation of the CCL8 gene in CD200R–/– tumors. In vitro co-culture experiments using Yumm1.7 tumor cells with bone marrow derived macrophages (BMDM) from WT and CD200R–/– mice confirmed upregulation of macrophage CCL8 in the absence of CD200-CD200R interaction. Finally, we found that anti-CD200 therapy failed to show efficacy either alone or in combination with checkpoint inhibitors such as anti-PD-1 or anti-CTLA4 in inhibiting Yumm1.7 tumor growth. Given that CD200R-deficiency or anti-CD200 treatment leads to reduced T cell responses in TME, using blockade of CD200 as an immunotherapy for cancers such as melanoma should be practiced with caution.
Collapse
Affiliation(s)
- Fatemeh Talebian
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Jianyu Yu
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Kimberly Lynch
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - Jin-Qing Liu
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, United States
| | - William E Carson
- Division of Surgical Oncology, Department of Surgery, Comprehensive Cancer Center, The Ohio State University, Columbus, OH, United States.,Comprehensive Cancer Center, Institute for Immuno-Oncology, The Ohio State University, Columbus, OH, United States
| | - Xue-Feng Bai
- Department of Pathology, College of Medicine, The Ohio State University, Columbus, OH, United States.,Comprehensive Cancer Center, Institute for Immuno-Oncology, The Ohio State University, Columbus, OH, United States
| |
Collapse
|
6
|
Elshal MF, El Shinnawy SM, ElShabacy FA, Hasabelnaby AS. Immunogenic analysis for involvement of CD200R1 molecule in rheumatoid arthritis patients. GENE REPORTS 2020. [DOI: 10.1016/j.genrep.2020.100757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
7
|
Liu JQ, Hu A, Zhu J, Yu J, Talebian F, Bai XF. CD200-CD200R Pathway in the Regulation of Tumor Immune Microenvironment and Immunotherapy. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1223:155-165. [PMID: 32030689 DOI: 10.1007/978-3-030-35582-1_8] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Tumor-associated inflammation and immune responses are key components in the tumor microenvironment (TME) which regulate tumor growth, progression, and metastasis. Tumor-associated myeloid cells (TAMCs) are a group of cells that play multiple key roles including induction of tumor-associated inflammation/angiogenesis and regulation of tumor-specific T-cell responses. Thus, identification and characterization of key pathways that can regulate TAMCs are of critical importance for developing cancer immunotherapy. Recent studies suggest that CD200-CD200 receptor (CD200R) interaction may be important in regulating the TME via affecting TAMCs. In this chapter, we will give a brief overview of the CD200-CD200R axis, including the biology behind CD200-CD200R interaction and the role(s) it plays in tumor microenvironment and tumor growth, and activation/effector functions of T cells. We will also discuss CD200-CD200R's role as potential checkpoint molecules for cancer immunotherapy. Further investigation of the CD200-CD200R pathway will not only advance our understanding of tumor pathogenesis and immunity but also provide the rationale for CD200-CD200R-targeted immunotherapy of human cancer.
Collapse
Affiliation(s)
- Jin-Qing Liu
- Department of Pathology, College of Medicine and Comprehensive Cancer Center, Ohio State University, Columbus, OH, USA
| | - Aiyan Hu
- Department of Pathology, College of Medicine and Comprehensive Cancer Center, Ohio State University, Columbus, OH, USA.,Pediatric Translational Medicine Institute, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jianmin Zhu
- Department of Pathology, College of Medicine and Comprehensive Cancer Center, Ohio State University, Columbus, OH, USA.,Pediatric Translational Medicine Institute, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jianyu Yu
- Department of Pathology, College of Medicine and Comprehensive Cancer Center, Ohio State University, Columbus, OH, USA.,Department of Gastroenterology, Guangdong Provincial Key Laboratory of Gastroenterology, Nan Fang Hospital, Southern Medical University, Guangzhou, China
| | - Fatemeh Talebian
- Department of Pathology, College of Medicine and Comprehensive Cancer Center, Ohio State University, Columbus, OH, USA
| | - Xue-Feng Bai
- Department of Pathology, College of Medicine and Comprehensive Cancer Center, Ohio State University, Columbus, OH, USA.
| |
Collapse
|
8
|
Immune checkpoints and rheumatic diseases: what can cancer immunotherapy teach us? Nat Rev Rheumatol 2016; 12:593-604. [DOI: 10.1038/nrrheum.2016.131] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
9
|
Liu JQ, Talebian F, Wu L, Liu Z, Li MS, Wu L, Zhu J, Markowitz J, Carson WE, Basu S, Bai XF. A Critical Role for CD200R Signaling in Limiting the Growth and Metastasis of CD200+ Melanoma. THE JOURNAL OF IMMUNOLOGY 2016; 197:1489-97. [PMID: 27385779 DOI: 10.4049/jimmunol.1600052] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 06/12/2016] [Indexed: 12/29/2022]
Abstract
CD200 is a cell surface glycoprotein that functions through engaging CD200R on cells of the myeloid lineage and inhibits their functions. Expression of CD200 was implicated in a variety of human cancer cells, including melanoma cells; however, its roles in tumor growth and immunity are not clearly understood. In this study, we used CD200R-deficient mice and the B16 tumor model to evaluate this issue. We found that CD200R-deficient mice exhibited accelerated growth of CD200(+), but not CD200(-), B16 tumors. Strikingly, CD200R-deficient mice receiving CD200(+) B16 cells i.v. exhibited massive tumor growth in multiple organs, including liver, lung, kidney, and peritoneal cavity, whereas the growth of the same tumors in wild-type mice was limited. CD200(+) tumors grown in CD200R-deficient mice contained higher numbers of CD11b(+)Ly6C(+) myeloid cells, exhibited increased expression of VEGF and HIF1α genes with increased angiogenesis, and showed significantly reduced infiltration of CD4(+) and CD8(+) T cells, presumably as the result of reduced expression of T cell chemokines, such as CXCL9 and CXCL16. The liver from CD200R-deficient mice, under metastatic growth of CD200(+) tumors, contained significantly increased numbers of CD11b(+)Gr1(-) myeloid cells and Foxp3(+) regulatory T cells and reduced numbers of NK cells. Liver T cells also had a reduced capacity to produce IFN-γ or TNF-α. Taken together, we revealed a critical role for CD200R signaling in limiting the growth and metastasis of CD200(+) tumors. Thus, targeting CD200R signaling may potentially interfere with the metastatic growth of CD200(+) tumors, like melanoma.
Collapse
Affiliation(s)
- Jin-Qing Liu
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210
| | - Fatemeh Talebian
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210
| | - Lisha Wu
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210; Department of Gastroenterology, Guangdong Provincial Key Laboratory of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Zhihao Liu
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210; Department of Gastroenterology, Guangdong Provincial Key Laboratory of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Ming-Song Li
- Department of Gastroenterology, Guangdong Provincial Key Laboratory of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Laichu Wu
- Davis Medical Research Center, Columbus, OH 43210; and
| | - Jianmin Zhu
- Pediatric Translational Medicine Institute, Shanghai Children's Medical Center, Shanghai Jiaotong University School of Medicine, Shanghai 200127, China
| | - Joseph Markowitz
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210
| | - William E Carson
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210
| | - Sujit Basu
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210
| | - Xue-Feng Bai
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210; Pediatric Translational Medicine Institute, Shanghai Children's Medical Center, Shanghai Jiaotong University School of Medicine, Shanghai 200127, China
| |
Collapse
|
10
|
Mousavinezhad-Moghaddam M, Amin AA, Rafatpanah H, Rezaee SAR. A new insight into viral proteins as Immunomodulatory therapeutic agents: KSHV vOX2 a homolog of human CD200 as a potent anti-inflammatory protein. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2016; 19:2-13. [PMID: 27096058 PMCID: PMC4823611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The physiologic function of the immune system is defense against infectious microbes and internal tumour cells, Therefore, need to have precise modulatory mechanisms to maintain the body homeostasis. The mammalian cellular CD200 (OX2)/CD200R interaction is one of such modulatory mechanisms in which myeloid and lymphoid cells are regulated. CD200 and CD200R molecules are membrane proteins that their immunomodulatory effects are able to suppress inflammatory responses, particularly in the privilege sites such as CNS and eyes. Kaposi's sarcoma-associated herpesvirus (KSHV), encodes a wide variety of immunoregulatory proteins which play central roles in modulating inflammatory and anti-inflammatory responses in favour of virus dissemination. One such protein is a homologue of the, encoded by open reading frame (ORF) K14 and therefore called vOX2. Based on its gene expression profile during the KSHV life cycle, it is hypothesised that vOX2 modulates host inflammatory responses. Moreover, it seems that vOX2 involves in cell adhesion and modulates innate immunity and promotes Th2 immune responses. In this review the activities of mammalian CD200 and KSHV CD200 in cell adhesion and immune system modulation are reviewed in the context of potential therapeutic agents.
Collapse
Affiliation(s)
| | - Abbas Ali Amin
- Department of Immunology, Faculty of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran
| | - Houshang Rafatpanah
- Immunology Research Center, Bu-Ali Research Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Seyed Abdol Rahim Rezaee
- Inflammation and Inflammatory Diseases Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran,Corresponding author: Seyed Abodol Rahim Rezaee. Inflammation and Inflammatory Diseases Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. Tel: +98-51-38012768; Fax: +98-51-38436626;
| |
Collapse
|
11
|
Holmannová D, Koláčková M, Kondělková K, Kuneš P, Krejsek J, Andrýs C. CD200/CD200R Paired Potent Inhibitory Molecules Regulating Immune and Inflammatory Responses; Part II : CD 200/CD200R Potential Clinical Applications. ACTA MEDICA (HRADEC KRÁLOVÉ) 2015; 55:59-65. [DOI: 10.14712/18059694.2015.56] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
CD200 and its receptor were recognized as having the multiple immunoregulatory functions. Their immunoregulatory, suppressive, and tolerogenic potentials could be very effectively exploited in the treatment of many diseases, e.g. Alzheimer disease, rheumatoid arthritis, and allergy to name only some. Many research projects are aimed to develop clinically valuable methods being based on the structure and function of these paired molecules. In this review, we would like to introduce CD200/CD200R functions in a clinical context.
Collapse
|
12
|
Ren Y, Yang B, Yin Y, Leng X, Jiang Y, Zhang L, Li Y, Li X, Zhang F, He W, Zhang X, Cao X. Aberrant CD200/CD200R1 expression and its potential role in Th17 cell differentiation, chemotaxis and osteoclastogenesis in rheumatoid arthritis. Rheumatology (Oxford) 2014; 54:712-21. [PMID: 25261692 DOI: 10.1093/rheumatology/keu362] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
OBJECTIVE CD200/CD200R1 signalling has an immunoregulatory effect on the activation threshold of the inflammatory immune response and maintains immune homeostasis. In this study we evaluated the status of CD200/CD200R1 interaction in patients with RA. METHODS The expression of CD200 and CD200R1 was examined by immunohistochemistry and flow cytometry and was compared between RA patients and healthy controls (HCs). Sorted CD4(+) T cells were stained with carboxyfluorescein succinimidyl ester (CFSE) and annexin V-propidium iodide to evaluate the effect of CD200 on cell proliferation and apoptosis. The effect of CD200 on Th17 differentiation, function and osteoclastogenesis was determined by flow cytometry, transwell migration assay and immunocytochemistry, respectively. RESULTS The proportion of CD200(+) cells and CD200R1(+) cells in peripheral blood mononuclear cells, peripheral CD14(+) cells and CD4(+) T cells was significantly lower in the RA patients than in HCs, whereas the number of CD200(+) cells was higher in synovium from RA patients than in that from HCs. After treatment with infliximab and MTX we found increased expression of peripheral CD200/CD200R1 that correlated with a decrease in the 28-joint DAS. CD200Fc in vitro partially inhibited CD4(+) T cell proliferation, promoted CD4(+) T cell apoptosis, reduced CD4(+) T cell differentiation into Th17 cells and down-regulated CCR6-mediated Th17 chemotaxis in cells from RA patients. In addition, the engagement of the CD200 receptors on CD14(+) cells with CD200Fc in vitro reduced osteoclastogenesis and inhibited CD14(+) cell-driven Th17 differentiation. CONCLUSION Abnormal CD200/CD200R1 expression in RA may contribute to abnormal Th17 cell differentiation, chemotaxis and osteoclastogenesis.
Collapse
Affiliation(s)
- Yan Ren
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China. Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| | - Bo Yang
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| | - Yufeng Yin
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| | - Xiaomei Leng
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| | - Ying Jiang
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| | - Lei Zhang
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| | - Yongzhe Li
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| | - Xin Li
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| | - Fengchun Zhang
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| | - Wei He
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| | - Xuan Zhang
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China.
| | - Xuetao Cao
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, Department of Health Care, China-Japan Friendship Hospital, Beijing, Department of Orthopaedics, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing and Department of Immunology, School of Basic Medicine, Peking Union Medical College and Institute of Basic Medical Sciences, Chinese Academy of Medical Science, Beijing, China
| |
Collapse
|
13
|
Gao S, Hao B, Yang XF, Chen WQ. Decreased CD200R expression on monocyte-derived macrophages correlates with Th17/Treg imbalance and disease activity in rheumatoid arthritis patients. Inflamm Res 2014; 63:441-50. [DOI: 10.1007/s00011-014-0716-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Accepted: 01/22/2014] [Indexed: 10/25/2022] Open
|
14
|
Do inhibitory immune receptors play a role in the etiology of autoimmune disease? Clin Immunol 2013; 150:31-42. [PMID: 24333531 DOI: 10.1016/j.clim.2013.11.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 11/07/2013] [Accepted: 11/10/2013] [Indexed: 12/21/2022]
Abstract
Inhibitory receptors are thought to be important in balancing immune responses. The general assumption is that lack of inhibition predisposes for autoimmune diseases. As reviewed here, various experimental and clinical data support this assumption. However, in humans genetic evidence implicates only a limited number of inhibitory receptors. GWAS have established common variation in a few inhibitory receptor genes, such as FCγRIIB, PD-1 and CTLA-4 as risk factors. The question arises whether inhibitory receptor function is a major determinant of autoimmune disease. In this respect, the finding that genetic variation in CSK and PTPN22 is strongly associated with multiple autoimmune diseases is of interest. We propose a model in which the molecules encoded by these genes are downstream of inhibitory receptors. We conclude that common genetic variation of inhibitory receptors, with few exceptions, is not a determining factor for autoimmunity in humans. However, common downstream signaling pathways are.
Collapse
|
15
|
The phenotype of circulating follicular-helper T cells in patients with rheumatoid arthritis defines CD200 as a potential therapeutic target. Clin Dev Immunol 2012; 2012:948218. [PMID: 23091555 PMCID: PMC3471455 DOI: 10.1155/2012/948218] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Accepted: 08/26/2012] [Indexed: 12/22/2022]
Abstract
Rheumatoid arthritis (RA) is a systemic autoimmune disease primarily affecting synovial joints in which the development of autoantibodies represents a failure of normal tolerance mechanisms, suggesting a role for follicular helper T cells (TFH) in the genesis of autoimmunity. To determine whether quantitative or qualitative abnormalities in the circulating TFH cell population exist, we analysed by flow cytometry the number and profile of these cells in 35 patients with RA and 15 matched controls. Results were correlated with patient characteristics, including the presence of autoantibodies, disease activity, and treatment with biologic agents. Circulating TFH cells from patients with RA show significantly increased expression of the immunoglobulin superfamily receptor CD200, with highest levels seen in seropositive patients (P = 0.0045) and patients treated with anti-TNFα agents (P = 0.0008). This occurs in the absence of any change in TFH numbers or overt bias towards Th1, Th2, or Th17 phenotypes. CD200 levels did not correlate with DAS28 scores (P = 0.887). Although the number of circulating TFH
cells is not altered in the blood of patients with RA, the TFH
cells have a distinct phenotype. These differences associate TFH
cells with the pathogenesis of RA and support the relevance of the CD200/CD200R signalling pathway as a potential therapeutic target.
Collapse
|
16
|
Characterization and functionality of the CD200-CD200R system during mesenchymal stromal cell interactions with T-lymphocytes. Immunol Lett 2012; 146:50-6. [PMID: 22575528 DOI: 10.1016/j.imlet.2012.04.017] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Revised: 04/02/2012] [Accepted: 04/23/2012] [Indexed: 02/07/2023]
Abstract
Mesenchymal stromal cells (MSCs) possess a specific immunological profile that makes them potentially useful for immune-based therapies. Adipose tissue (AT) and Wharton's jelly (WJ) are considered to be valuable alternatives to bone marrow (BM) as sources of MSCs. These MSCs exhibit strong immunomodulatory properties that affect lymphocyte responses. The CD200/CD200R axis has been reported to be important in regulating the immune responses. Engagement of CD200R by CD200 initiates an inhibitory pathway that displays immunosuppressive effects. Because the CD200/CD200R axis is involved in immunoregulation, we investigated the expression and role of this ligand/receptor pair in MSCs and T-lymphocytes during co-culture. CD200 is differently expressed and modulated on MSCs depending on the tissue of origin and the culture conditions. Among the different MSC sources, WJ-MSCs express CD200 in the greatest proportion. This high constitutive CD200 expression may represent a distinctive marker for WJ-MSCs. A pro-inflammatory environment and IFN-γ in particular induce an increase in CD200 expression by BM-MSCs. In T-lymphocytes, CD200R and CD200 are differently distributed between the CD4(+) and CD8(+) T-cell subsets. During co-culture, blocking CD200-CD200R interactions does not prevent MSC-mediated inhibition of lymphocyte proliferation. However, depending on their origin, MSCs are able to modulate the expression of both CD200 and CD200R on some T-cells. Further study is required to understand the function of CD200 expression by nonmyeloid cells such MSCs and the significance of CD200 and C200R expression by T-cells. The findings presented here support bidirectional communication between MSCs and T-lymphocytes. Understanding the role of this ligand-receptor pair during co-culture will improve and increase the clinical use of MSCs.
Collapse
|
17
|
Pietilä M, Lehtonen S, Tuovinen E, Lähteenmäki K, Laitinen S, Leskelä HV, Nätynki A, Pesälä J, Nordström K, Lehenkari P. CD200 positive human mesenchymal stem cells suppress TNF-alpha secretion from CD200 receptor positive macrophage-like cells. PLoS One 2012; 7:e31671. [PMID: 22363701 PMCID: PMC3282758 DOI: 10.1371/journal.pone.0031671] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Accepted: 01/11/2012] [Indexed: 01/14/2023] Open
Abstract
Human mesenchymal stem cells (hMSCs) display immunosuppressive properties in vitro and the potential has also been transferred successfully to clinical trials for treatment of autoimmune diseases. OX-2 (CD200), a member of the immunoglobulin superfamily, is widely expressed in several tissues and has recently been found from hMSCs. The CD200 receptor (CD200R) occurs only in myeloid-lineage cells. The CD200-CD200R is involved in down-regulation of several immune cells, especially macrophages. The present study on 20 hMSC lines shows that the CD200 expression pattern varied from high (CD200Hi) to medium (CD200Me) and low (CD200Lo) in bone marrow-derived mesenchymal stem cell (BMMSC) lines, whereas umbilical cord blood derived mesenchymal stem cells (UCBMSCs) were constantly negative for CD200. The role of the CD200-CD200R axis in BMMSCs mediated immunosuppression was studied using THP-1 human macrophages. Interestingly, hMSCs showed greater inhibition of TNF-α secretion in co-cultures with IFN-γ primed THP-1 macrophages when compared to LPS activated cells. The ability of CD200Hi BMMSCs to suppress TNF-α secretion from IFN-γ stimulated THP-1 macrophages was significantly greater when compared to CD200Lo whereas UCBMSCs did not significantly reduce TNF-α secretion. The interference of CD200 binding to the CD200R by anti-CD200 antibody weakened the capability of BMMSCs to inhibit TNF-α secretion from IFN-γ activated THP-1 macrophages. This study clearly demonstrated that the efficiency of BMMSCs to suppress TNF-α secretion of THP-1 macrophages was dependent on the type of stimulus. Moreover, the CD200-CD200r axis could have a previously unidentified role in the BMMSC mediated immunosuppression.
Collapse
Affiliation(s)
- Mika Pietilä
- Institute of Biomedicine, Department of Anatomy and Cell Biology, University of Oulu, Oulu, Finland.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Talebian F, Liu JQ, Liu Z, Khattabi M, He Y, Ganju R, Bai XF. Melanoma cell expression of CD200 inhibits tumor formation and lung metastasis via inhibition of myeloid cell functions. PLoS One 2012; 7:e31442. [PMID: 22319630 PMCID: PMC3272017 DOI: 10.1371/journal.pone.0031442] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Accepted: 01/10/2012] [Indexed: 12/30/2022] Open
Abstract
CD200 is a cell surface glycoprotein that functions through engaging CD200 receptor on cells of the myeloid lineage and inhibits their functions. Expression of CD200 has been implicated in a variety of human cancer cells including melanoma cells and has been thought to play a protumor role. To investigate the role of cancer cell expression of CD200 in tumor formation and metastasis, we generated CD200-positive and CD200-negative B16 melanoma cells. Subcutaneous injection of CD200-positive B16 melanoma cells inhibited tumor formation and growth in C57BL/6 mice but not in Rag1−/−C57BL/6 mice. However, i.v. injection of CD200-positive B16 melanoma cells dramatically inhibited tumor foci formation in the lungs of both C57BL/6 and Rag1−/−C57BL6 mice. Flow cytometry analysis revealed higher expression of CD200R in Gr1+ myeloid cells in the lung than in peripheral myeloid cells. Depletion of Gr1+ cells or stimulation of CD200R with an agonistic antibody in vivo dramatically inhibited tumor foci formation in the lungs. In addition, treatment with tumor antigen specific CD4 or CD8 T cells or their combination yielded a survival advantage for CD200 positive tumor bearing mice over mice bearing CD200-negative tumors. Taken together, we have revealed a novel role for CD200-CD200R interaction in inhibiting tumor formation and metastasis. Targeting CD200R may represent a novel approach for cancer immunotherapy.
Collapse
Affiliation(s)
- Fatemeh Talebian
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
- Integrated Biomedical Science Graduate Program, The Ohio State University, Columbus, Ohio, United States of America
| | - Jin-Qing Liu
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
| | - Zhenzhen Liu
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
- The Ohio State Biochemistry Program, The Ohio State University, Columbus, Ohio, United States of America
| | - Mazin Khattabi
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
| | - Yukai He
- Immunology/Immunotherapy Program, Georgia Health Sciences University, Augusta, Georgia, United States of America
| | - Ramesh Ganju
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
| | - Xue-Feng Bai
- Department of Pathology and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, United States of America
- * E-mail:
| |
Collapse
|
19
|
Zhang S, Wang XJ, Tian LP, Pan J, Lu GQ, Zhang YJ, Ding JQ, Chen SD. CD200-CD200R dysfunction exacerbates microglial activation and dopaminergic neurodegeneration in a rat model of Parkinson's disease. J Neuroinflammation 2011; 8:154. [PMID: 22053982 PMCID: PMC3226566 DOI: 10.1186/1742-2094-8-154] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2011] [Accepted: 11/06/2011] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Increasing evidence suggests that microglial activation may participate in the aetiology and pathogenesis of Parkinson's disease (PD). CD200-CD200R signalling has been shown to be critical for restraining microglial activation. We have previously shown that expression of CD200R in monocyte-derived macrophages, induced by various stimuli, is impaired in PD patients, implying an intrinsic abnormality of CD200-CD200R signalling in PD brain. Thus, further in vivo evidence is needed to elucidate the role of malfunction of CD200-CD200R signalling in the pathogenesis of PD. METHODS 6-hydroxydopamine (6-OHDA)-lesioned rats were used as an animal model of PD. CD200R-blocking antibody (BAb) was injected into striatum to block the engagement of CD200 and CD200R. The animals were divided into three groups, which were treated with 6-OHDA/Veh (PBS), 6-OHDA/CAb (isotype control antibody) or 6-OHDA/BAb, respectively. Rotational tests and immunohistochemistry were employed to evaluate motor deficits and dopaminergic neurodegeneration in animals from each group. HPLC analysis was used to measure monoamine levels in striatum. Morphological analysis and quantification of CD11b- (or MHC II-) immunoreactive cells were performed to investigate microglial activation and possible neuroinflammation in the substantia nigra (SN). Finally, ELISA was employed to assay protein levels of proinflammatory cytokines. RESULTS Compared with 6-OHDA/CAb or 6-OHDA/Veh groups, rats treated with 6-OHDA/BAb showed a significant increase in counts of contralateral rotation and a significant decrease in TH-immunoreactive (TH-ir) neurons in SN. A marked decrease in monoamine levels was also detected in 6-OHDA/BAb-treated rats, in comparison to 6-OHDA/Veh-treated ones. Furthermore, remarkably increased activation of microglia as well as up-regulation of proinflammatory cytokines was found concomitant with dopaminergic neurodegeneration in 6-OHDA/BAb-treated rats. CONCLUSIONS This study shows that deficits in the CD200-CD200R system exacerbate microglial activation and dopaminergic neurodegeneration in a 6-OHDA-induced rat model of PD. Our results suggest that dysfunction of CD200-CD200R signalling may be involved in the aetiopathogenesis of PD.
Collapse
Affiliation(s)
- Shi Zhang
- Department of Neurology & Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, 197 Ruijin Er Road, Shanghai, P.R. China
| | | | | | | | | | | | | | | |
Collapse
|
20
|
Abstract
CD200 is a cell surface glycoprotein that binds an inhibitory receptor (CD200R) on myeloid cells. CD200 orthologues are present in many species of virus, and we show that the rat cytomegalovirus CD200 orthologue (e127) is expressed at the cell surface on infected cells. It binds the host CD200R with the same affinity as that of the host protein, and thus this protein acts as a close mimic of the host protein and has the potential to downregulate immune responses to the virus.
Collapse
|