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Li F, Xu L, Li C, Hu F, Su Y. Immunological role of Gas6/TAM signaling in hemostasis and thrombosis. Thromb Res 2024; 238:161-171. [PMID: 38723521 DOI: 10.1016/j.thromres.2024.05.002] [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: 03/13/2024] [Revised: 04/26/2024] [Accepted: 05/02/2024] [Indexed: 05/21/2024]
Abstract
The immune system is an emerging regulator of hemostasis and thrombosis. The concept of immunothrombosis redefines the relationship between coagulation and immunomodulation, and the Gas6/Tyro3-Axl-MerTK (TAM) signaling pathway builds the bridge across them. During coagulation, Gas6/TAM signaling pathway not only activates platelets, but also promotes thrombosis through endothelial cells and vascular smooth muscle cells involved in inflammatory responses. Thrombosis appears to be a common result of a Gas6/TAM signaling pathway-mediated immune dysregulation. TAM TK and its ligands have been found to be involved in coagulation through the PI3K/AKT or JAK/STAT pathway in various systemic diseases, providing new perspectives in the understanding of immunothrombosis. Gas6/TAM signaling pathway serves as a breakthrough target for novel therapeutic strategies to improve disease management. Many preclinical and clinical studies of TAM receptor inhibitors are in process, confirming the pivotal role of Gas6/TAM signaling pathway in immunothrombosis. Therapeutics targeting the TAM receptor show potential both in anticoagulation management and immunotherapy. Here, we review the immunological functions of the Gas6/TAM signaling pathway in coagulation and its multiple mechanisms in diseases identified to date, and discuss the new clinical strategies that may generated by these roles.
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Affiliation(s)
- Fanshu Li
- Department of Rheumatology and Immunology, Peking University People's Hospital & Beijing Key Laboratory for Rheumatism Mechanism and Immune Diagnosis (BZ0135), Beijing, China
| | - Liling Xu
- Department of Rheumatology and Immunology, Peking University People's Hospital & Beijing Key Laboratory for Rheumatism Mechanism and Immune Diagnosis (BZ0135), Beijing, China.
| | - Chun Li
- Department of Rheumatology and Immunology, Peking University People's Hospital & Beijing Key Laboratory for Rheumatism Mechanism and Immune Diagnosis (BZ0135), Beijing, China
| | - Fanlei Hu
- Department of Rheumatology and Immunology, Peking University People's Hospital & Beijing Key Laboratory for Rheumatism Mechanism and Immune Diagnosis (BZ0135), Beijing, China; State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China; Department of Integration of Chinese and Western Medicine, School of Basic Medical Sciences, Peking University, Beijing, China.
| | - Yin Su
- Department of Rheumatology and Immunology, Peking University People's Hospital & Beijing Key Laboratory for Rheumatism Mechanism and Immune Diagnosis (BZ0135), Beijing, China; Peking University People's Hospital, Qingdao, China
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Belyaeva IV, Kosova AN, Vasiliev AG. Tuberculosis and Autoimmunity. PATHOPHYSIOLOGY 2022; 29:298-318. [PMID: 35736650 PMCID: PMC9228380 DOI: 10.3390/pathophysiology29020022] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 06/03/2022] [Accepted: 06/07/2022] [Indexed: 12/17/2022] Open
Abstract
Tuberculosis remains a common and dangerous chronic bacterial infection worldwide. It is long-established that pathogenesis of many autoimmune diseases is mainly promoted by inadequate immune responses to bacterial agents, among them Mycobacterium tuberculosis. Tuberculosis is a multifaceted process having many different outcomes and complications. Autoimmunity is one of the processes characteristic of tuberculosis; the presence of autoantibodies was documented by a large amount of evidence. The role of autoantibodies in pathogenesis of tuberculosis is not quite clear and widely disputed. They are regarded as: (1) a result of imbalanced immune response being reactive in nature, (2) a critical part of TB pathogenicity, (3) a beginning of autoimmune disease, (4) a protective mechanism helping to eliminate microbes and infected cells, and (5) playing dual role, pathogenic and protective. There is no single autoimmunity-mechanism development in tuberculosis; different pathways may be suggested. It may be excessive cell death and insufficient clearance of dead cells, impaired autophagy, enhanced activation of macrophages and dendritic cells, environmental influences such as vitamin D insufficiency, and genetic polymorphism, both of Mycobacterium tuberculosis and host.
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Abdelghany WM, Salah M, Saleh WA, Dahy OM, Helmy R. Activity of Protein S-C4b Binding Protein and Total TFPI Levels in Egyptian SLE Patients: A Cross-Sectional Study. Open Access Maced J Med Sci 2022. [DOI: 10.3889/oamjms.2022.8247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
BACKGROUND: Systemic lupus erythematosus (SLE) is an immune disorder with alternating active and remission phases. Cardiovascular diseases and thrombosis are the major causes of mortality in SLE. The anticoagulant activity of Protein S (PS) is complemented by C4 binding protein (C4BP) and tissue factor pathway inhibitor (TFPI).
AIM: This study aims to determine the extent of change in the levels of PS activity, C4BP, and total TFPI in active SLE in comparison to the SLE remission phase and their association with thrombosis during SLE flare.
METHODS: The study included 180 Egyptian SLE patients who were classified into two groups: 100 SLE cases as the active group and 80 SLE cases as the remission group. The PS activity levels were processed on automated coagulation analyzers, whereas the C4BP and total TFPI levels were measured via enzyme-linked immunosorbent assay.
RESULTS: The PS activity and C4BP levels were lower in the active SLE cases than in the remitted ones (p < 0.05). The levels of PS activity and C4BP were revealed to be independent predictors of SELENA-SLEDAI flare scores. In active SLE cases, the PS activity and C4BP levels were rated as excellent and fair classifiers of thrombotic risk in SLE flare, respectively. The total TFPI levels showed no association with SLE activity or its thrombotic consequences.
CONCLUSIONS: The levels of PS activity and C4BP act as important biomarkers for SLE activity. Both can be implanted as predictive tools for thrombosis during activity.
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Sakti DH, Cornish EE, Mustafic N, Zaheer A, Retsas S, Rajagopalan S, Chung CW, Ewans L, McCluskey P, Nash BM, Jamieson RV, Grigg JR. MERTK retinopathy: biomarkers assessing vision loss. Ophthalmic Genet 2021; 42:706-716. [PMID: 34289798 DOI: 10.1080/13816810.2021.1955278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
PURPOSE Mer tyrosine kinase-retinitis pigmentosa (MERTK-RP) causes a primary defect in the retinal pigment epithelium, which subsequently affects rod and cone photoreceptors. The study aims to identify the most appropriate MERTK-RP biomarkers to measure disease progression for deciding the optimum therapeutic trial intervention time. MATERIALS AND METHODS Patients' data from baseline (BL) and last follow-up (LFU) were reviewed. Best corrected visual acuity (BCVA), spectral domain-optical coherence tomography (SD-OCT), ultra-widefield fundus autofluorescence (UWF-FAF) patterns, kinetic perimetry (KP), and electroretinography (ERG) parameters were analyzed. RESULTS Five patients were included with the mean age of 17.7 ± 14.4 years old (6.7-42.3) at BL and mean BCVA follow-up of 8.4 ± 5.1 years. Mean BCVA at BL and LFU were 0.84 ± 0.86 LogMAR and 1.14 ± 0.86 LogMAR, respectively. The BCVA decline rate was 0.05 ± 0.03 LogMAR units/year. Ellipzoid zones (EZ) were measurable in eight eyes with mean BL length of 1293.75 ± 421.07 µm and reduction of 140.95 ± 69.28 µm/year and mean BL CMT of 174.2 ± 37.52 µm with the rate of 11.2 ± 12.77 µm declining/year. Full-field ERG (ffERG) and pattern ERG (pERG) were barely recordable. UWF-FAF showed central macular hyper-autofluorescence (hyperAF). KP (III4e and V4e) was normal in two eyes, restricted nasally in four eyes, superior wedge defect in two eyes and undetectable in two eyes. The four restricted nasally KPs became worse, while the others stayed almost unchanged. CONCLUSIONS This cohort showed early visual loss, moderately rapid EZ reduction and macular hyperAF. EZ, CMT, and BCVA were consistently reduced. Relative rapid decline in these biomarkers reflecting visual function suggests an early and narrow timespan for intervention.
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Affiliation(s)
- Dhimas H Sakti
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia.,Department of Ophthalmology, Faculty of Medicine, Public Health and Nursing; Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Elisa E Cornish
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia.,Eye Genetics Research Unit, Children's Medical Research Institute, the Children's Hospital at Westmead, Save Sight Institute, University of Sydney, Sydney, NSW, Australia
| | - Nina Mustafic
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Afsah Zaheer
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Stephanie Retsas
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Sulekha Rajagopalan
- Department of Clinical Genetics, Liverpool Hospital, Liverpool BC, NSW, Australia
| | - Clara Wt Chung
- Department of Clinical Genetics, Liverpool Hospital, Liverpool BC, NSW, Australia.,School of Women's & Children's Health, University of NSW, Sydney, NSW, Australia
| | - Lisa Ewans
- Department of Clinical Genetics, Royal Prince Alfred Hospital, Camperdown, NSW, Australia.,Faculty of Medicine and Health Central Clinical School, Sydney Medical School, University of Sydney, Sydney, NSW, Australia
| | - Peter McCluskey
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Benjamin M Nash
- Eye Genetics Research Unit, Children's Medical Research Institute, the Children's Hospital at Westmead, Save Sight Institute, University of Sydney, Sydney, NSW, Australia.,Disciplines of Genomic Medicine & Child and Adolescent Health, Sydney Medical School, University of Sydney, Sydney, NSW, Australia.,Sydney Genome Diagnostics, Western Sydney Genetics Program, the Children's Hospital at Westmead, Sydney, NSW, Australia
| | - Robyn V Jamieson
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia.,Eye Genetics Research Unit, Children's Medical Research Institute, the Children's Hospital at Westmead, Save Sight Institute, University of Sydney, Sydney, NSW, Australia.,Disciplines of Genomic Medicine & Child and Adolescent Health, Sydney Medical School, University of Sydney, Sydney, NSW, Australia.,Department of Clinical Genetics, Western Sydney Genetics Program, the Children's Hospital at Westmead, Sydney, NSW, Australia
| | - John R Grigg
- Save Sight Institute, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia.,Eye Genetics Research Unit, Children's Medical Research Institute, the Children's Hospital at Westmead, Save Sight Institute, University of Sydney, Sydney, NSW, Australia
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Wang KH, Ding DC. Dual targeting of TAM receptors Tyro3, Axl, and MerTK: Role in tumors and the tumor immune microenvironment. Tzu Chi Med J 2020; 33:250-256. [PMID: 34386362 PMCID: PMC8323642 DOI: 10.4103/tcmj.tcmj_129_20] [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: 05/25/2020] [Revised: 06/12/2020] [Accepted: 07/02/2020] [Indexed: 11/06/2022] Open
Abstract
In both normal and tumor tissues, receptor tyrosine kinases (RTKs) may be pleiotropically expressed. The RTKs not only regulate ordinary cellular processes, including proliferation, survival, adhesion, and migration, but also have a critical role in the development of many types of cancer. The Tyro3, Axl, and MerTK (TAM) family of RTKs (Tyro3, Axl, and MerTK) plays a pleiotropic role in phagocytosis, inflammation, and normal cellular processes. In this article, we highlight the cellular activities of TAM receptors and discuss their roles in cancer and immune cells. We also discuss cancer therapies that target TAM receptors. Further research is needed to elucidate the function of TAM receptors in immune cells toward the development of new targeted immunotherapies for cancer.
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Affiliation(s)
- Kai-Hung Wang
- Department of Medical Research, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan
| | - Dah-Ching Ding
- Department of Obstetrics and Gynecology, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation and Tzu Chi University, Hualien, Taiwan
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Pilli VS, Datta A, Dorsey A, Liu B, Majumder R. Modulation of protein S and growth arrest specific 6 protein signaling inhibits pancreatic cancer cell survival and proliferation. Oncol Rep 2020; 44:1322-1332. [PMID: 32945517 PMCID: PMC7448444 DOI: 10.3892/or.2020.7689] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 05/08/2020] [Indexed: 12/14/2022] Open
Abstract
Thrombotic complications and hypercoagulopathies are commonly associated with the progression of pancreatic ductal adenocarcinoma (PDAC). Although the mechanistic link between the two phenomena is uncertain, there is evidently an increase in procoagulant proteins and a decrease in anticoagulants in PDAC patients. For example, the anticoagulant protein S (PS) is decreased during the progression of PDAC, a condition that possibly contributes to the hypercoagulopathies. PS is also an important signaling molecule that binds a family of tyrosine kinase receptors known as TAM (Tyro3, Axl and Mer) receptors; TAM receptors are often upregulated in different cancers. Growth Arrest Specific 6 or GAS6 protein, a homolog of PS, is also a TAM receptor family ligand. The downstream signaling pathways triggered by this ligand-receptor interaction perform diverse functions, such as cell survival, proliferation, efferocytosis, and apoptosis. Targeting the TAM receptors to treat cancer has had limited success; side effects are a significant obstacle due to the widespread numerous functions of TAM receptors. In the present study, it was revealed that PS-TAM interaction was pro-apoptotic, whereas GAS6-mediated TAM signaling promoted proliferation and survival in select PDAC cell lines. Furthermore, by regulating the balance between these two signaling pathways (by overexpressing PS or knocking down GAS6), the proliferative potential of the cells was decreased. Both long-term and short-term effects of natural PS overexpression were comparable to the treatment of the cells with the drug UNC2025, which inhibits the Mer-receptor. The present study lays the foundation for investigation of PS as a therapeutic agent to control cancer progression and to concurrently arrest thrombotic events.
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Affiliation(s)
- Vijaya S Pilli
- Department of Biochemistry, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - Arani Datta
- Department of Biochemistry, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - Adrianne Dorsey
- Department of Biochemistry, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
| | - Bo Liu
- Department of Surgery, University of Wisconsin, Madison, WI 53705, USA
| | - Rinku Majumder
- Department of Biochemistry, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
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Increased sMer, but not sAxl, sTyro3, and Gas6 relate with active disease in juvenile systemic lupus erythematosus. Clin Rheumatol 2019; 39:509-514. [PMID: 31655933 DOI: 10.1007/s10067-019-04799-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 09/04/2019] [Accepted: 09/23/2019] [Indexed: 10/25/2022]
Abstract
INTRODUCTION/OBJECTIVES Tyro3, Axl, and Mer (TAM) receptors and ligands mediate apoptotic bodies engulfment which alteration has been related with juvenile systemic lupus erythematosus (JSLE) pathogenesis. Thus, the aim was to determine their soluble levels. METHODS Serum sTyro3, sAxl, sMer, and Gas6 levels were measured using ELISA in 67 JSLE patients, 12 juvenile idiopathic arthritis (JIA) inflammatory and 20 healthy controls and related with SLEDAI-2K score, anti-dsDNA antibody, ESR, CRP, C3, C4 levels, and nephritis. RESULTS JSLE patients with active disease (SLEDAI-2K> 4) had significantly increased sMer levels compared with healthy controls (median 8.4 vs. 6.0 ng/mL, p = 0.009) and inactive disease patients (5.2 ng/mL, p = 0.0003). sMer levels correlated with SLEDAI-2K (r = 0.44; p = 0.0004) and ESR (r = 0.24; p = 0.04), while sAxl correlated with SLEDAI-2K (r = 0.33; p = 0.008) and C4 levels (r = - 0.24; p = 0.04). JSLE patients taking glucocorticoid had increased sAxl and sMer levels. Moreover, sAxl correlated with sMer and sTyro3 levels. Patients with nephritis and those with focal or diffuse proliferative glomerulonephritis had these protein levels similar to healthy controls and patients without renal involvement. sTyro3 levels of JSLE patients taking glucocorticoid were decreased, and correlated with Gas6 and sAxl, while Gas6 levels correlated with age upon enrollment. JIA controls had protein levels similar to healthy controls and JSLE patients. CONCLUSIONS This study reinforces that sMer is increased in active JSLE patients, yet sMer and sAxl correlates with disease activity parameters, and their alterations are disease-specific. However, further studies are needed to determine exact roles of sTyro3 and Gas6 in disease pathogenesis. Key Points • sMer and sAxl serum levels are related with active disease in JSLE patients • sMer correlated with SLEDAI-2K score in JSLE • sTyro3, sAxl, sMer and Gas6 levels did not related with nephritis in JSLE patients • sTyro3 and Gas6 exact roles in JSLE are not established and further studies are needed.
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8
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Jung JY, Lee SW, Kim HA, Suh CH. Plasma Free Protein S Is Correlated with Disease Activity, but not with Subclinical Atherosclerosis among Patients with Systemic Lupus Erythematosus: A Cross-Sectional Study. TOHOKU J EXP MED 2019; 249:1-7. [PMID: 31511453 DOI: 10.1620/tjem.249.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A defect in clearance of apoptotic materials is pivotal in the pathogenesis of systemic lupus erythematosus (SLE). Protein S participates in the removal of apoptotic remnants and the anticoagulation pathway. The aim of the study was to clarify the relationship between plasma levels of free protein S and the disease activity or subclinical atherosclerosis in SLE. Free protein S was measured by an enzyme-linked immunosorbent assay, and patients were classified into two groups of free protein S levels: low (< 50%) and normal (≥ 50%). One hundred-eleven Korean female patients with SLE were enrolled, and the levels of free protein S were 67.4 ± 19.7%. Carotid plaque was detected in 25 (22.5%) patients. Twenty-one patients with low free protein S had lower hemoglobin (11.4 ± 1.4 vs. 12.5 ± 1.4 g/dL) and lymphocytes (1,221 ± 609 vs. 1,720 ± 1,097/µL), higher erythrocyte sedimentation rate (30.1 ± 20.6 vs. 20.8 ± 17.8 mm/h), and lower complement 3 (80.8 ± 27.6 vs. 103.4 ± 25.8 mg/dL) and complement 4 (15.6 ± 10.4 vs. 21.5 ± 7.6 mg/dL) than those with normal protein S. There was no significant difference in the proportion of patients with increased carotid artery intima-media thickness (> 4.6 mm) or with carotid artery plaque between two groups. The low levels of free protein S were associated with hemoglobin (OR = 0.64, p = 0.04) and complement 3 (OR = 0.96, p = 0.005). Free protein S is correlated with disease activity, but not with subclinical atherosclerosis in SLE.
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Affiliation(s)
- Ju-Yang Jung
- Department of Rheumatology, Ajou University School of Medicine
| | - Sang Won Lee
- Department of Rheumatology, Ajou University School of Medicine
| | - Hyoun-Ah Kim
- Department of Rheumatology, Ajou University School of Medicine
| | - Chang-Hee Suh
- Department of Rheumatology, Ajou University School of Medicine
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Abstract
Tissue macrophages rapidly recognize and engulf apoptotic cells. These events require the display of so-called eat-me signals on the apoptotic cell surface, the most fundamental of which is phosphatidylserine (PtdSer). Externalization of this phospholipid is catalysed by scramblase enzymes, several of which are activated by caspase cleavage. PtdSer is detected both by macrophage receptors that bind to this phospholipid directly and by receptors that bind to a soluble bridging protein that is independently bound to PtdSer. Prominent among the latter receptors are the MER and AXL receptor tyrosine kinases. Eat-me signals also trigger macrophages to engulf virus-infected or metabolically traumatized, but still living, cells, and this 'murder by phagocytosis' may be a common phenomenon. Finally, the localized presentation of PtdSer and other eat-me signals on delimited cell surface domains may enable the phagocytic pruning of these 'locally dead' domains by macrophages, most notably by microglia of the central nervous system.
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Affiliation(s)
- Greg Lemke
- Molecular Neurobiology Laboratory, Immunobiology and Microbial Pathogenesis Laboratory, The Salk Institute for Biological Studies, La Jolla, CA, USA.
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10
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Gas6/TAM Receptors in Systemic Lupus Erythematosus. DISEASE MARKERS 2019; 2019:7838195. [PMID: 31360267 PMCID: PMC6652053 DOI: 10.1155/2019/7838195] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/14/2019] [Accepted: 06/25/2019] [Indexed: 01/25/2023]
Abstract
Systemic lupus erythematosus (SLE) is a multiorgan autoimmune disease associated with impaired immune system regulation. The exact mechanisms of SLE development remain to be elucidated. TAM receptor tyrosine kinases (RTKs) are important for apoptotic cell clearance, immune homeostasis, and resolution of immune responses. TAM deficiency leads to lupus-like autoimmune diseases. Activation of TAM receptors leads to proteolytic cleavage of the receptors, generating soluble forms of TAM. Circulating TAM receptors have an immunoregulatory function and may also serve as biomarkers for disease prognosis. Here, we review the biological function and signaling of TAM RTKs in the development and pathogenesis of lupus and lupus nephritis. Targeting Gas6/TAM pathways may be of therapeutic benefit. A discussion of potential TAM activation and inhibition in the treatment of lupus and lupus nephritis is included.
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11
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Sjogren's Syndrome and TAM Receptors: A Possible Contribution to Disease Onset. J Immunol Res 2019; 2019:4813795. [PMID: 31214622 PMCID: PMC6535826 DOI: 10.1155/2019/4813795] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 04/17/2019] [Accepted: 04/28/2019] [Indexed: 02/06/2023] Open
Abstract
Sjogren's syndrome (SS) is a chronic, progressive autoimmune disease featuring both organ-specific and systemic manifestations, the most frequent being dry mouth and dry eyes resulting from lymphocytic infiltration into the salivary and lacrimal glands. Like the related autoimmune disease systemic lupus erythematosus (SLE), SS patients and mouse models display accumulation of apoptotic cells and a Type I interferon (IFN) signature. Receptor tyrosine kinases (RTKs) of the Tyro3, Axl, and Mer (TAM) family are present on the surface of macrophages and dendritic cells and participate in phagocytosis of apoptotic cells (efferocytosis) and inhibition of Type I IFN signaling. This review examines the relationship between TAM receptor dysfunction and SS and explores the potential contributions of TAM defects on macrophages to SS development.
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12
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Zizzo G, Cohen PL. Antibody Cross-Linking of CD14 Activates MerTK and Promotes Human Macrophage Clearance of Apoptotic Neutrophils: the Dual Role of CD14 at the Crossroads Between M1 and M2c Polarization. Inflammation 2019; 41:2206-2221. [PMID: 30091033 DOI: 10.1007/s10753-018-0864-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Mer receptor tyrosine kinase (MerTK) is key for efficient phagocytosis of apoptotic neutrophils (ANs) and homeostasis of IL-10 production by human anti-inflammatory M2c monocytes/macrophages. We asked whether stimulation of M2c surface receptors contributes in turn to MerTK activation. For this purpose, human monocytes/macrophages were differentiated under M1, M2a, and M2c polarizing conditions. The effects of antibody-mediated cross-linking of M2c receptors (i.e., CD14, CD16, CD32, CD163, CD204) on MerTK phosphorylation and phagocytosis of ANs were tested. MerTK expression was also studied by flow cytometry and western blot in the presence of LPS and in M2c-derived microvesicles (MVs). Antibody cross-linking of either CD14 or CD32/FcγRII led to Syk activation and MerTK phosphorylation in its two distinct glycoforms (175-205 and 135-155 kDa). Cross-linked CD14 enhanced efferocytosis by M2c macrophages and enabled M1 and M2a cells to clear ANs efficiently. In M1 conditions, LPS abolished surface MerTK expression on CD14bright cell subsets, so disrupting the anti-inflammatory pathway. In M2c cells, instead, MerTK was diffusely and brightly co-expressed with CD14, and was also detected in M2c macrophage-derived MVs; in these conditions, LPS only partially downregulated MerTK on cell surfaces, while the smaller MerTK glycoform contained in MVs remained intact. Altogether, cooperation between CD14 and MerTK may foster the clearance of ANs by human monocytes/macrophages. CD14 stands between M1-related LPS co-receptor activity and M2c-related MerTK-dependent response. MerTK interaction with CD32/FcγRII, its detection in M2c MVs, and the differential localization and LPS susceptibility of MerTK glycoforms add further new elements to the complexity of the MerTK network.
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Affiliation(s)
- Gaetano Zizzo
- Temple Autoimmunity Center, Temple University, 3500 N. Broad Street, Philadelphia, PA, 19140, USA. .,Section of Rheumatology, Department of Medicine, Lewis Katz School of Medicine at Temple University, 3322 N. Broad Street, Philadelphia, PA, 19140, USA.
| | - Philip L Cohen
- Temple Autoimmunity Center, Temple University, 3500 N. Broad Street, Philadelphia, PA, 19140, USA. .,Section of Rheumatology, Department of Medicine, Lewis Katz School of Medicine at Temple University, 3322 N. Broad Street, Philadelphia, PA, 19140, USA.
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13
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Jiang L, Chen XQ, Gao MJ, Lee W, Zhou J, Zhao YF, Wang GD. The Pros1/Tyro3 axis protects against periodontitis by modulating STAT/SOCS signalling. J Cell Mol Med 2019; 23:2769-2781. [PMID: 30729671 PMCID: PMC6433735 DOI: 10.1111/jcmm.14183] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Revised: 11/21/2018] [Accepted: 01/10/2019] [Indexed: 12/17/2022] Open
Abstract
Periodontitis, an oral inflammatory disease caused by periodontal pathogen infection, is the most prevalent chronic inflammatory disease and a major burden on healthcare. The TAM receptor tyrosine kinases (Tyro3, Axl and Mertk) and their ligands (Gas6 and Pros1) play a pivotal role in the resolution of inflammation and have been associated with chronic inflammatory and autoimmune diseases. In this study, we evaluated the effects of exogenous Pros1 in in vitro and in vivo models of periodontitis. We detected higher Pros1 but lower Tyro3 levels in inflamed gingival specimens of periodontitis patients compared with healthy controls. Moreover, Pros1 was mostly localized in the gingival epithelium of all specimens. In cultured human gingival epithelial cells (hGECs), Porphyromonas gingivalis LPS (p.g-LPS) stimulation down-regulated Pros1 and Tyro3. Exogenous Pros1 inhibited p.g-LPS-induced production of TNF-α, IL-6, IL-1β, MMP9/2 and RANKL in a Tyro3-dependent manner as revealed by PCR, Western blot analysis, ELISA and gelatin zymography. Pros1 also restored Tyro3 expression down-regulated by p.g-LPS in hGECs. In rats treated with ligature and p.g-LPS, administration of Pros1 attenuated periodontitis-associated gingival inflammation and alveolar bone loss. Our mechanistic studies implicated SOCS1/3 and STAT1/3 as mediators of the in vitro and in vivo anti-inflammatory effects of Pros1. Collectively, the findings from this work supported Pros1 as a novel anti-inflammatory therapy for periodontitis.
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Affiliation(s)
- Lei Jiang
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Xiao Qing Chen
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Ming Jing Gao
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Wai Lee
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Jie Zhou
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Yun Fu Zhao
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Guo Dong Wang
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
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Gheibi Hayat SM, Bianconi V, Pirro M, Sahebkar A. Efferocytosis: molecular mechanisms and pathophysiological perspectives. Immunol Cell Biol 2018; 97:124-133. [DOI: 10.1111/imcb.12206] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 09/15/2018] [Accepted: 09/16/2018] [Indexed: 12/28/2022]
Affiliation(s)
| | - Vanessa Bianconi
- Unit of Internal Medicine, Angiology and Arteriosclerosis Diseases; Department of Medicine; University of Perugia; Perugia Italy
| | - Matteo Pirro
- Unit of Internal Medicine, Angiology and Arteriosclerosis Diseases; Department of Medicine; University of Perugia; Perugia Italy
| | - Amirhossein Sahebkar
- Biotechnology Research Center; Pharmaceutical Technology Institute; Mashhad University of Medical Sciences; Mashhad Iran
- Neurogenic Inflammation Research Center; Mashhad University of Medical Sciences; Mashhad Iran
- School of Pharmacy; Mashhad University of Medical Sciences; Mashhad Iran
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15
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The Dual Role of TAM Receptors in Autoimmune Diseases and Cancer: An Overview. Cells 2018; 7:cells7100166. [PMID: 30322068 PMCID: PMC6210017 DOI: 10.3390/cells7100166] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/05/2018] [Accepted: 10/09/2018] [Indexed: 01/01/2023] Open
Abstract
Receptor tyrosine kinases (RTKs) regulate cellular processes by converting signals from the extracellular environment to the cytoplasm and nucleus. Tyro3, Axl, and Mer (TAM) receptors form an RTK family that plays an intricate role in tissue maintenance, phagocytosis, and inflammation as well as cell proliferation, survival, migration, and development. Defects in TAM signaling are associated with numerous autoimmune diseases and different types of cancers. Here, we review the structure of TAM receptors, their ligands, and their biological functions. We discuss the role of TAM receptors and soluble circulating TAM receptors in the autoimmune diseases systemic lupus erythematosus (SLE) and multiple sclerosis (MS). Lastly, we discuss the effect of TAM receptor deregulation in cancer and explore the therapeutic potential of TAM receptors in the treatment of diseases.
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Del Carmen S, Hapak SM, Ghosh S, Rothlin CV. Coagulopathies and inflammatory diseases: '…glimpse of a Snark'. Curr Opin Immunol 2018; 55:44-53. [PMID: 30268838 DOI: 10.1016/j.coi.2018.09.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 09/10/2018] [Indexed: 11/18/2022]
Abstract
Coagulopathies and inflammatory diseases, ostensibly, have distinct underlying molecular bases. Notwithstanding, both are host defense mechanisms to physical injury. In invertebrates, clotting can function directly in anti-pathogen defense. Molecules of the vertebrate clotting cascade have also been directly linked to the regulation of inflammation. We posit that thrombophilia may provide resistance against pathogens in vertebrates. The selective pressure of improved anti-pathogen defense may have retained mutations associated with a thrombophilic state in the human population and directly contributed to enhanced inflammation. Indeed, in some inflammatory diseases, at least a subset of patients can be identified as hypercoagulable. Therefore, anticoagulants such as warfarin or apixaban may have a therapeutic role in some inflammatory diseases.
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Affiliation(s)
- Silvina Del Carmen
- Department of Immunobiology, School of Medicine, Yale University, 300 Cedar Street, New Haven, CT 06520, United States
| | - Sophie M Hapak
- Department of Medicine, School of Medicine, University of Minnesota, 401 East River Parkway, Minneapolis, MN 55455, United States
| | - Sourav Ghosh
- Department of Neurology, School of Medicine, Yale University, 15 York Street, New Haven, CT 06510, United States; Department of Pharmacology, School of Medicine, Yale University, 333 Cedar Street, New Haven, CT 06520, United States.
| | - Carla V Rothlin
- Department of Immunobiology, School of Medicine, Yale University, 300 Cedar Street, New Haven, CT 06520, United States; Department of Pharmacology, School of Medicine, Yale University, 333 Cedar Street, New Haven, CT 06520, United States.
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17
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Eksi Alp E, Altinkaya N, Cagman Z, Uras F. Plasma growth arrest-specific 6 levels in term and preterm newborns. J Matern Fetal Neonatal Med 2018; 31:1151-1155. [DOI: 10.1080/14767058.2017.1311311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Emel Eksi Alp
- Department of Paediatrics, Maltepe University Medical School, Istanbul, Turkey
| | - Nuvit Altinkaya
- Department of Paediatrics, Maltepe University Medical School, Istanbul, Turkey
| | - Zeynep Cagman
- Department of Biochemistry, Marmara University School of Pharmacy, Istanbul, Turkey
| | - Fikriye Uras
- Department of Biochemistry, Marmara University School of Pharmacy, Istanbul, Turkey
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18
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Pikman R, Kivity S, Levy Y, Arango MT, Chapman J, Yonath H, Shoenfeld Y, Gofrit SG. Neuropsychiatric SLE: from animal model to human. Lupus 2017; 26:470-477. [PMID: 28394237 DOI: 10.1177/0961203317694261] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Animal models are a key element in disease research and treatment. In the field of neuropsychiatric lupus research, inbred, transgenic and disease-induced mice provide an opportunity to study the pathogenic routes of this multifactorial illness. In addition to achieving a better understanding of the immune mechanisms underlying the disease onset, supplementary metabolic and endocrine influences have been discovered and investigated. The ever-expanding knowledge about the pathologic events that occur at disease inception enables us to explore new drugs and therapeutic approaches further and to test them using the same animal models. Discovery of the molecular targets that constitute the pathogenic basis of the disease along with scientific advancements allow us to target these molecules with monoclonal antibodies and other specific approaches directly. This novel therapy, termed "targeted biological medication" is a promising endeavor towards producing drugs that are more effective and less toxic. Further work to discover additional molecular targets in lupus' pathogenic mechanism and to produce drugs that neutralize their activity is needed to provide patients with safe and efficient methods of controlling and treating the disease.
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Affiliation(s)
- R Pikman
- 1 Israel Defense Forces Medical Corps, Ramat Gan, Israel
| | - S Kivity
- 2 Department of Medicine A, Sheba Medical Center, Tel-Hashomer, Israel.,3 The Zabludovicz Center for Autoimmune Diseases.,4 The Dr Pinchas Borenstein Talpiot Medical Leadership Program 2013; and Sheba Medical Center, Tel-Hashomer, Israel.,5 Sackler Faculty of Medicine, Tel Aviv University, Ramat-Aviv, Israel
| | - Y Levy
- 6 Department of Medicine E, Meir Medical Center, Kfar Saba, Israel; affiliated with the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - M-T Arango
- 3 The Zabludovicz Center for Autoimmune Diseases.,7 Doctoral Program in Biomedical Sciences, Universidad del Rosario, Bogotá-Colombia
| | - J Chapman
- 5 Sackler Faculty of Medicine, Tel Aviv University, Ramat-Aviv, Israel.,8 Department of Neurology, Sagol Neuroscience Center, Sheba Medical Center, Tel-Hashomer, Israel
| | - H Yonath
- 2 Department of Medicine A, Sheba Medical Center, Tel-Hashomer, Israel.,5 Sackler Faculty of Medicine, Tel Aviv University, Ramat-Aviv, Israel.,9 The Danek Gartner Institute of Human Genetics, Sheba Medical Center, Tel-Hashomer, Israel
| | - Y Shoenfeld
- 3 The Zabludovicz Center for Autoimmune Diseases.,5 Sackler Faculty of Medicine, Tel Aviv University, Ramat-Aviv, Israel.,10 Incumbent of the Laura Schwarz-Kip Chair for Research of Autoimmune Diseases, Sackler Faculty of Medicine, Tel Aviv University, Israel
| | - S G Gofrit
- 2 Department of Medicine A, Sheba Medical Center, Tel-Hashomer, Israel
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19
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Abstract
Apoptosis is an important component of normal tissue physiology, and the prompt removal of apoptotic cells is equally essential to avoid the undesirable consequences of their accumulation and disintegration. Professional phagocytes are highly specialized for engulfing apoptotic cells. The recent ability to track cells that have undergone apoptosis in situ has revealed a division of labor among the tissue resident phagocytes that sample them. Macrophages are uniquely programmed to process internalized apoptotic cell-derived fatty acids, cholesterol and nucleotides, as a reflection of their dominant role in clearing the bulk of apoptotic cells. Dendritic cells carry apoptotic cells to lymph nodes where they signal the emergence and expansion of highly suppressive regulatory CD4 T cells. A broad suppression of inflammation is executed through distinct phagocyte-specific mechanisms. A clever induction of negative regulatory nodes is notable in dendritic cells serving to simultaneously shut down multiple pathways of inflammation. Several of the genes and pathways modulated in phagocytes in response to apoptotic cells have been linked to chronic inflammatory and autoimmune diseases such as atherosclerosis, inflammatory bowel disease and systemic lupus erythematosus. Our collective understanding of old and new phagocyte functions after apoptotic cell phagocytosis demonstrates the enormity of ways to mediate immune suppression and enforce tissue homeostasis.
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Affiliation(s)
- J Magarian Blander
- Jill Roberts Institute for Research in Inflammatory Bowel Disease, Joan and Sanford I. Weill Department of Medicine, Department of Microbiology and Immunology, Weill Cornell Medicine, Cornell University, New York, NY, USA
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20
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Bassyouni IH, El-Wakd MM, Azab NA, Bassyouni RH. Diminished soluble levels of growth arrest specific protein 6 and tyrosine kinase receptor Axl in patients with rheumatoid arthritis. Int J Rheum Dis 2017; 20:53-59. [PMID: 24702788 DOI: 10.1111/1756-185x.12367] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
AIM Growth arrest specific protein 6 (Gas-6) and its tyrosine kinase receptor Axl plays an important role in apoptosis, and regulation of innate immune response, therefore, we investigated their plasma concentrations in Rheumatoid arthritis (RA) patients and correlated them to clinical, laboratory and radiological parameters of the disease. METHODS Plasma from 77 RA patients and 50 normal healthy subjects were assayed for plasma Gas6 and Axl levels. Demographic, clinical and serological data were prospectively assessed. Rheumatoid arthritis disease activity was assessed using 28-joint Disease Activity Score (DAS-28) and functional capacity by modified health assessment questionnaire (mHAQ). Standardized x-rays for hands and feet were done to all participants. RESULTS The level of Gas6 and Axl were significantly decreased in the RA patients compared to those of the healthy control subjects. Levels of Gas6 correlated positively with Axl levels in both patients and healthy control. Gas6 levels were remarkably reduced in those patients with erosive RA than those without. Levels of Gas6 were found to be negatively correlated with the presence of erosive disease and positively correlated with DAS-28, ESR, Leucocytosis and IL6. CONCLUSION The plasma concentrations of Gas6 and Axl are altered in RA patients and thus may have a role in RA pathogenesis. Further mechanistic studies on the involvement of all TAM receptors tyrosine kinases pathway in RA are needed to help in understanding the pathogenesis and possibly aid in diagnosis and future treatments of RA especially for patients with erosive disease.
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Affiliation(s)
- Iman H Bassyouni
- Rheumatology and Rehabilitation Department, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Mohammed M El-Wakd
- Rheumatology and Rehabilitation Department, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Noha A Azab
- Rheumatology and Rehabilitation Department, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Rasha H Bassyouni
- Medical Microbiology and Immunology, Faculty of Medicine, El-Fayoum University, Cairo, Egypt
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21
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Kim BS, Jung JY, Jeon JY, Kim HA, Suh CH. Circulating hsa-miR-30e-5p, hsa-miR-92a-3p, and hsa-miR-223-3p may be novel biomarkers in systemic lupus erythematosus. HLA 2016; 88:187-93. [DOI: 10.1111/tan.12874] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 07/21/2016] [Accepted: 08/12/2016] [Indexed: 12/27/2022]
Affiliation(s)
- B.-S. Kim
- Department of Rheumatology; Ajou University School of Medicine; Suwon Korea
| | - J.-Y. Jung
- Department of Rheumatology; Ajou University School of Medicine; Suwon Korea
| | - J.-Y. Jeon
- Department of Rheumatology; Ajou University School of Medicine; Suwon Korea
| | - H.-A. Kim
- Department of Rheumatology; Ajou University School of Medicine; Suwon Korea
| | - C.-H. Suh
- Department of Rheumatology; Ajou University School of Medicine; Suwon Korea
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22
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Bevers EM, Williamson PL. Getting to the Outer Leaflet: Physiology of Phosphatidylserine Exposure at the Plasma Membrane. Physiol Rev 2016; 96:605-45. [PMID: 26936867 DOI: 10.1152/physrev.00020.2015] [Citation(s) in RCA: 298] [Impact Index Per Article: 37.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Phosphatidylserine (PS) is a major component of membrane bilayers whose change in distribution between inner and outer leaflets is an important physiological signal. Normally, members of the type IV P-type ATPases spend metabolic energy to create an asymmetric distribution of phospholipids between the two leaflets, with PS confined to the cytoplasmic membrane leaflet. On occasion, membrane enzymes, known as scramblases, are activated to facilitate transbilayer migration of lipids, including PS. Recently, two proteins required for such randomization have been identified: TMEM16F, a scramblase regulated by elevated intracellular Ca(2+), and XKR8, a caspase-sensitive protein required for PS exposure in apoptotic cells. Once exposed at the cell surface, PS regulates biochemical reactions involved in blood coagulation, and bone mineralization, and also regulates a variety of cell-cell interactions. Exposed on the surface of apoptotic cells, PS controls their recognition and engulfment by other cells. This process is exploited by parasites to invade their host, and in specialized form is used to maintain photoreceptors in the eye and modify synaptic connections in the brain. This review discusses what is known about the mechanism of PS exposure at the surface of the plasma membrane of cells, how actors in the extracellular milieu sense surface exposed PS, and how this recognition is translated to downstream consequences of PS exposure.
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Affiliation(s)
- Edouard M Bevers
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands; and Department of Biology, Amherst College, Amherst, Massachusetts
| | - Patrick L Williamson
- Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands; and Department of Biology, Amherst College, Amherst, Massachusetts
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23
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Tsai WB, Long Y, Park JR, Chang JT, Liu H, Rodriguez-Canales J, Savaraj N, Feun LG, Davies MA, Wistuba II, Kuo MT. Gas6/Axl is the sensor of arginine-auxotrophic response in targeted chemotherapy with arginine-depleting agents. Oncogene 2016; 35:1632-42. [PMID: 26096933 PMCID: PMC4835044 DOI: 10.1038/onc.2015.237] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 05/06/2015] [Accepted: 05/26/2015] [Indexed: 02/08/2023]
Abstract
Many human malignancies lack de novo biosynthesis of arginine (Arg) as the key enzyme argininosuccinate synthetase 1 (ASS1) is silenced. These tumors acquire ectopic Arg for survival, and depleting this source by Arg-depleting recombinant enzyme ADI-PEG20 results in cell death. Mechanisms underlying Arg auxotrophy in these tumors and how they respond to Arg-auxotrophic stress are poorly understood. Here, we report that an immediate-early event of Arg-auxotrophic response involves reactive oxygen species-mediated secretion of Gas6, which interacts with its receptor Axl and activates the downstream Ras/PI3K/Akt growth signal leading to accumulation of c-Myc by protein stabilization. Arg-auxotrophic challenge also transcriptionally upregulates c-Myc expression, which provides a feedback mechanism to enhance Axl expression. c-Myc is a positive regulator of ASS1, but elevated ASS1 provides a feedback mechanism to suppress c-Myc and Axl. Our results revealed multiple inter-regulatory pathways in Arg-auxotrophic response, consisting of Axl, c-Myc and ASS1, which regulate Arg homeostasis and ADI-PEG20 sensitivity. These pathways provide potential targets for improving the efficacy of treating Arg-auxotrophic tumors using Arg-deprivation strategies.
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Affiliation(s)
- Wen-Bin Tsai
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Yan Long
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Jeong-Ran Park
- Department of Thoracic and Cardiovascular Surgery, Kangwon National University, Gangwon, Korea 200-701
| | - Jeffrey T. Chang
- Department of Integrative Biology and Pharmacology, University of Texas Health Science Center at Houston, Houston, Texas 77030
| | - Hui Liu
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Jaime Rodriguez-Canales
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Niramol Savaraj
- Sylvester Comprehensive Cancer Center, University of Miami, Miami, FL 33135
| | - Lynn G. Feun
- Sylvester Comprehensive Cancer Center, University of Miami, VA Medical Center, Miami, Fl. 33125
| | - Michael A. Davies
- Department of Melanoma Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Ignacio I Wistuba
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
| | - Macus Tien Kuo
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030
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24
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The clearance of dying cells: table for two. Cell Death Differ 2016; 23:915-26. [PMID: 26990661 PMCID: PMC4987729 DOI: 10.1038/cdd.2015.172] [Citation(s) in RCA: 191] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 12/15/2015] [Accepted: 12/16/2015] [Indexed: 12/19/2022] Open
Abstract
Phagocytic cells of the immune system must constantly survey for, recognize, and efficiently clear the billions of cellular corpses that arise as a result of development, stress, infection, or normal homeostasis. This process, termed efferocytosis, is critical for the prevention of autoimmune and inflammatory disorders, and persistence of dead cells in tissue is characteristic of many human autoimmune diseases, notably systemic lupus erythematosus. The most notable characteristic of the efferocytosis of apoptotic cells is its ‘immunologically silent' response. Although the mechanisms by which phagocytes facilitate engulfment of dead cells has been a well-studied area, the pathways that coordinate to process the ingested corpse and direct the subsequent immune response is an area of growing interest. The recently described pathway of LC3 (microtubule-associated protein 1A/1B-light chain 3)-associated phagocytosis (LAP) has shed some light on this issue. LAP is triggered when an extracellular particle, such as a dead cell, engages an extracellular receptor during phagocytosis, induces the translocation of autophagy machinery, and ultimately LC3 to the cargo-containing phagosome, termed the LAPosome. In this review, we will examine efferocytosis and the impact of LAP on efferocytosis, allowing us to reimagine the impact of the autophagy machinery on innate host defense mechanisms.
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25
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Sunbul M, Cagman Z, Gerin F, Ozgen Z, Durmus E, Seckin D, Ahmad S, Uras F, Agirbasli M. Growth arrest-specific 6 and cardiometabolic risk factors in patients with psoriasis. Cardiovasc Ther 2015; 33:56-61. [PMID: 25752901 DOI: 10.1111/1755-5922.12112] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
OBJECTIVES An increased risk for cardiovascular disease with psoriasis has been reported. Growth Arrest-Specific 6 (GAS6) amplifies pro-inflammatory endothelial cell activation via TAM receptors. However, it also inhibits inflammation by multiple mechanisms including phagocytosis. The objective of this study was to investigate whether plasma GAS6 levels are associated with conventional cardiometabolic (CM) risk factors in patients with psoriasis. METHODS Forty patients diagnosed with psoriasis (22 male, mean age: 43.3 ± 13.8 years) and 40 age-/sex-matched healthy controls (22 male, mean age: 39.3 ± 8.9 years) were included in the study. CM risk factors (hypertension, hyperlipidemia, diabetes mellitus, and cigarette smoking) were identified. GAS6 levels were measured by ELISA. RESULTS There were no significant differences between the plasma GAS6 levels of patients with psoriasis compared to the control group (6.6 ± 2.0 ng/mL, 7.6 ± 2.8 ng/mL, respectively, P > 0.05). However, GAS6 levels of patients with psoriasis having a smoking history (n = 11) were significantly lower than both patients with psoriasis who had no smoking history (n = 29) and controls (5.5 ± 1.7 ng/mL, 6.9 ± 1.9 ng/mL, 7.6 ± 2.8 ng/mL, respectively, P < 0.05). Similarly, psoriasis patients with at least one CM risk factor showed lower GAS6 levels compared to subjects without any CM risk factor (5.7 ± 1.7 ng/mL, 7.3 ± 2.0 ng/mL, P < 0.01). There was no correlation between the GAS6 level, disease duration or PASI score (r = 0.150, -0.150, and P = 0.310, 0.398, respectively). CONCLUSIONS This pilot study provides the first evidence in humans for an association between low plasma GAS6 levels and conventional risk factors in psoriasis. Further large scale, prospective studies are needed to confirm these results.
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Affiliation(s)
- Murat Sunbul
- Department of Cardiology, Faculty of Medicine, Marmara University, Istanbul, Turkey
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Chen CH, Chen HC, Chang CC, Peng YJ, Lee CH, Shieh YS, Hung YJ, Lin YF. Growth Arrest-Specific 6 Protein in Patients with Sjögren Syndrome: Determination of the Plasma Level and Expression in the Labial Salivary Gland. PLoS One 2015; 10:e0139955. [PMID: 26445266 PMCID: PMC4596882 DOI: 10.1371/journal.pone.0139955] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 09/18/2015] [Indexed: 01/21/2023] Open
Abstract
Aims Growth arrest-specific protein 6 (Gas6) is a vitamin K-dependent protein expressed by endothelial cells and leukocytes that are involved in cell survival, migration, and proliferation in response to inflammatory processes. The aim of this study was to assess the implications of Gas6 in Sjögren syndrome (SS) and its expression in the labial salivary gland. Methods and Results A total of 254 adults, including 159 with primary Sjögren syndrome (pSS), 34 with secondary Sjögren syndrome (sSS), and 61 normal controls, were recruited. Plasma Gas6 concentrations were determined, and Gas6 expressions in labial salivary gland (LSG) tissues from controls and pSS and sSS patients were also evaluated. Plasma Gas6 concentrations were significantly lower among patients with pSS than normal controls (13.5 ± 8.6 vs. 19.9 ± 13.4 ng/ml, p < 0.001). There were, however, no significant differences in plasma Gas6 levels between pSS and sSS patients (13.5 ± 8.6 vs. 16.9 ± 11.2 ng/ml, p = 0.068). In multivariate logistic regression analysis, after adjustment for white blood cell count, hemoglobin level, platelet count, lymphocyte count, and C3 and C4 levels, lower plasma Gas6 concentrations were significantly associated with an increased risk of SS. Moreover, by using a semi-quantitative scale to evaluate Gas6 expression in LSG tissues, Gas6 expression was found to be markedly lower in LSG tissues from pSS patients than in tissues from normal controls. Conclusions Decreased plasma Gas6 concentration and LSG expression were associated with pSS. As such, Gas6 may represent a novel independent risk factor for pSS, with a potential role in salivary gland inflammation and dysfunction.
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Affiliation(s)
- Chen-Hung Chen
- Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei, Taiwan
- Division of Rheumatology, Immunology and Allergy, Department of Internal Medicine, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, School of Medicine, Tzu Chi University, Hualien, Taiwan
- Division of Rheumatology, Immunology and Allergy, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Hsiang-Cheng Chen
- Division of Rheumatology, Immunology and Allergy, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Chi-Ching Chang
- Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei, Taiwan
- Division of Rheumatology, Immunology and Allergy, Department of Internal Medicine, Taipei Medical University Hospital, Taipei, Taiwan
| | - Yi-Jen Peng
- Department of Pathology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Chien-Hsing Lee
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Yi-Shing Shieh
- School of Dentistry, National Defense Medical Center, Department of Oral Diagnosis and Pathology, Tri-Service General Hospital, Taipei, Taiwan
| | - Yi-Jen Hung
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Yuh-Feng Lin
- Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei, Taiwan
- Division of Nephrology, Department of Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan
- * E-mail:
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27
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Ma GZ, Giuffrida LL, Gresle MM, Haartsen J, Laverick L, Butzkueven H, Field J, Binder MD, Kilpatrick TJ. Association of plasma levels of Protein S with disease severity in multiple sclerosis. Mult Scler J Exp Transl Clin 2015; 1:2055217315596532. [PMID: 28607700 PMCID: PMC5433335 DOI: 10.1177/2055217315596532] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Background The TAM family of receptor tyrosine kinases (TYRO3, AXL and MERTK) play important roles in modulating innate immune responses and central demyelination. The TAM receptor ligand Protein S (PROS) has also been shown to modulate innate immune cell responses. Objectives We assessed whether plasma levels of PROS are changed in multiple sclerosis (MS) patients and whether changes are associated with disease severity. Methods Plasma levels of total and free PROS were measured using enzyme-linked immunosorbent assay in a discovery cohort (MS: 65, control: 14) and an independent replication cohort (MS: 29, control: 29). The Multiple Sclerosis Severity Score (MSSS) was used to evaluate associations between plasma PROS levels and disease severity. Results We found plasma levels of total, but not free PROS, were decreased in MS patients compared with controls. In female MS patients, we observed decreases in total and free PROS levels compared with controls. In addition, we also observed higher MSSS in patients with very low levels of plasma free PROS. Conclusions These data suggest PROS may represent a potential marker of disease severity in MS.
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Affiliation(s)
- Gerry Zm Ma
- Multiple Sclerosis Division, The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Australia
| | - Lauren L Giuffrida
- Multiple Sclerosis Division, The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Australia
| | | | - Jodi Haartsen
- Eastern Clinical Research Unit, Department of Neurology, Box Hill Hospital, Monash University, Australia
| | - Louise Laverick
- The Department of Medicine, University of Melbourne, Australia
| | | | - Judith Field
- Multiple Sclerosis Division, The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Australia
| | - Michele D Binder
- Multiple Sclerosis Division, The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Australia
| | - Trevor J Kilpatrick
- Multiple Sclerosis Division, The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Australia
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28
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Kim HA, Jung JY, Suh CH. Biomarkers for systemic lupus erythematosus: an update. ACTA ACUST UNITED AC 2015. [DOI: 10.2217/ijr.15.17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Jung JY, Suh CH. Incomplete clearance of apoptotic cells in systemic lupus erythematosus: pathogenic role and potential biomarker. Int J Rheum Dis 2015; 18:294-303. [PMID: 25884792 DOI: 10.1111/1756-185x.12568] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Systemic lupus erythematosus (SLE) is a chronic autoimmune disease with repeated inflammation against multiple organs. Although its pathophysiology is not yet unveiled, uncleared apoptotic cells and their accumulation in tissue contribute to the autoimmune disturbance in SLE. Apoptosis is a programmed cell death process, which maintains tissue homeostasis and inhibits the development of any further immune response against apoptotic remnants. Earlier studies revealed that various 'eat-me' signals on apoptotic cells, bridging molecules and their receptors on phagocytes play a role in such a complicated process. Tyro3-Axl-Mer receptors, their bridging molecules, milk fat globulin epidermal growth factor-8, T-cell immunoglobulin mucin domain protein family, scavenger receptors, C1q, and pentraxins were found to be abnormal in SLE. In this review, apoptosis and clearance of its remnants are summarized, and the molecules involved in the incomplete clearance of apoptotic cells in SLE are discussed.
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Affiliation(s)
- Ju-Yang Jung
- Department of Rheumatology, Ajou University School of Medicine, Suwon, Korea
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Qin B, Wang J, Ma N, Yang M, Fu H, Liang Y, Huang F, Yang Z, Zhong R. The association of Tyro3/Axl/Mer signaling with inflammatory response, disease activity in patients with primary Sjögren's syndrome. Joint Bone Spine 2015; 82:258-63. [PMID: 25881761 DOI: 10.1016/j.jbspin.2015.01.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Accepted: 01/19/2015] [Indexed: 11/28/2022]
Abstract
OBJECTIVES Defects in Tyro3/Axl/Mer signaling may lead to impaired phagocytosis of apoptotic cells, eventually contributing to the development of autoimmune disease. The association of TAM signaling with several autoimmune disease has been investigated, but it remains unclear in primary Sjögren's syndrome. Therefore, the aim of this study was to evaluate the level of TAM signaling in primary Sjögren's syndrome with its clinical significance. METHODS Real-Time Polymerase Chain Reaction was used to determine the mRNA expression of Mer, Tyro-3, Axl, Gas6, and Protein S in Peripheral Blood Mononuclear Cell from 43 pSS and 46 control. The Enzyme-Linked Immunosorbent Assay method was used to test plasma levels of soluble TAM signaling from those individuals, and the relationship of their levels with clinical characteristic was evaluated. RESULTS The mRNA expression levels of Tyro-3, Axl were decreased in pSS patients. When considering the plasma level, increased levels of soluble Mer was observed with statistically significant difference. Soluble Mer levels were positively correlated with IgG levels (r=0.53, P<0.01), Erythrocyte Sedimentation Rate levels (r=0.44, P<0.01) and Sjögren's Syndrome Disease Activity Index (r=0.48, P<0.01). And the levels of soluble Mer in patients with the presence of SSA/SSB were higher than those without SSA/SSB. CONCLUSIONS The plasma levels of sMer were increased in pSS patients, which was associated with inflammatory response and disease activity.
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Affiliation(s)
- Baodong Qin
- Department of Laboratory Diagnostics, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Jiaqi Wang
- Department of stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Ning Ma
- Department of Laboratory Diagnostics, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Min Yang
- Department of Laboratory Diagnostics, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Haitao Fu
- Department of Laboratory Diagnostics, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Yan Liang
- Department of Laboratory Diagnostics, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Fenglou Huang
- Department of Laboratory Diagnostics, Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Zaixing Yang
- Department of Laboratory Diagnostics, Changzheng Hospital, Second Military Medical University, Shanghai, China.
| | - Renqian Zhong
- Department of Laboratory Diagnostics, Changzheng Hospital, Second Military Medical University, Shanghai, China.
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Lee IJ, Hilliard BA, Ulas M, Yu D, Vangala C, Rao S, Lee J, Gadegbeku CA, Cohen PL. Monocyte and plasma expression of TAM ligand and receptor in renal failure: Links to unregulated immunity and chronic inflammation. Clin Immunol 2015; 158:231-41. [PMID: 25814173 DOI: 10.1016/j.clim.2015.01.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Revised: 01/30/2015] [Accepted: 01/31/2015] [Indexed: 12/29/2022]
Abstract
Chronic inflammation is increased in patients with chronic kidney disease (CKD) and contributes to cardiovascular morbidity and mortality. Specific immune mechanisms and pathways that drive and maintain chronic inflammation in CKD are not well described. The TAM ligands (Gas6 and protein S) and receptors (Axl and Mer) have been recently recognized as playing a prominent role in immune regulation. The receptors exist in both soluble and cell-bound forms; the soluble receptors (sAxl and sMer) are believed to compete with the bound receptors and thus inhibit their function. In this study, we determined the expression of cell-bound and soluble TAM proteins in patients with CKD. CKD patients had significantly lower expression of Mer in monocytes, yet increased expression of soluble TAM receptors sAxl and sMer in plasma compared to controls. The metalloproteinase ADAM 17, responsible for cleavage of Mer to its soluble form, was increased in patient monocytes. Elevated levels of soluble TAM receptors were more evident in patients with progressive renal failure. These observations suggest that functional deficiency of TAM receptor-mediated regulation of inflammation may contribute to chronic inflammation in patients with CKD.
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Affiliation(s)
- Iris J Lee
- Section of Nephrology, Department of Medicine, Temple University, Philadelphia, PA, USA.
| | - Brendan A Hilliard
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA, USA
| | - Mehriban Ulas
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA, USA
| | - Daohai Yu
- Department of Clinical Sciences, Temple University, Philadelphia, PA, USA
| | - Chandan Vangala
- School of Medicine, Temple University, Philadelphia, PA, USA
| | - Swati Rao
- Section of Nephrology, Department of Medicine, Temple University, Philadelphia, PA, USA
| | - Jean Lee
- Section of Nephrology, Department of Medicine, Temple University, Philadelphia, PA, USA
| | - Crystal A Gadegbeku
- Section of Nephrology, Department of Medicine, Temple University, Philadelphia, PA, USA
| | - Philip L Cohen
- Section of Rheumatology, Department of Medicine, Temple University, Philadelphia, PA, USA
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Rothlin CV, Carrera-Silva EA, Bosurgi L, Ghosh S. TAM receptor signaling in immune homeostasis. Annu Rev Immunol 2015; 33:355-91. [PMID: 25594431 DOI: 10.1146/annurev-immunol-032414-112103] [Citation(s) in RCA: 320] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The TAM receptor tyrosine kinases (RTKs)-TYRO3, AXL, and MERTK-together with their cognate agonists GAS6 and PROS1 play an essential role in the resolution of inflammation. Deficiencies in TAM signaling have been associated with chronic inflammatory and autoimmune diseases. Three processes regulated by TAM signaling may contribute, either independently or collectively, to immune homeostasis: the negative regulation of the innate immune response, the phagocytosis of apoptotic cells, and the restoration of vascular integrity. Recent studies have also revealed the function of TAMs in infectious diseases and cancer. Here, we review the important milestones in the discovery of these RTKs and their ligands and the studies that underscore the functional importance of this signaling pathway in physiological immune settings and disease.
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Hung YJ, Lee CH, Shieh YS, Hsiao FC, Lin FH, Hsieh CH. Plasma growth arrest-specific protein 6 levels in premenopausal and postmenopausal women: the role of endogenous estrogen. Endocrine 2014; 47:923-9. [PMID: 24676757 DOI: 10.1007/s12020-014-0234-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Accepted: 03/01/2014] [Indexed: 11/24/2022]
Abstract
Growth arrest-specific 6 (Gas6) is a vitamin K-dependent protein that interacts with receptor tyrosine kinases of the Tyro-3, AXL, Mer (TAM) family. The Gas6/TAM system contributes to the regulation of cell survival and proliferation, cell adhesion and migration, and inflammatory cytokines release. Plasma Gas6 plays an important role in the inflammatory process, and is involved in diverse human diseases. Few studies have investigated gender-specific variations in plasma Gas6 concentration. Hence, the aim of this study was to determine whether plasma Gas6 levels are associated with sex hormones in premenopausal and postmenopausal women. A total of 103 premenopausal and 135 postmenopausal women were recruited. Plasma Gas6 concentration, estradiol (E2), and sex hormone-binding globulin were assayed. The free estrogen index (FEI) was calculated. The results showed significantly lower Gas6 levels in the postmenopausal compared to the premenopausal women (P < 0.005). Plasma Gas6 levels were positively correlated with E2 levels in the pre- and postmenopausal women (r = 0.359, P < 0.001 and r = 0.261, P = 0.002, respectively). Gas6 levels were also correlated with FEI in the pre- and postmenopausal women (r = 0.234, P = 0.017 and r = 0.188, P = 0.029, respectively). After adjusting for confounders, the correlations still remained significant. In multiple stepwise regression analysis, only E2 in premenopausal and both age and E2 in postmenopausal women were independently correlated with the plasma Gas6 levels (all P < 0.001). These results suggest that plasma Gas6 is associated with sex hormones in both pre- and postmenopausal women, indicating a potential role of sex hormones in the Gas6/TAM system.
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Affiliation(s)
- Yi-Jen Hung
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, No 325, Sec 2, Cheng-Gong Rd, Nei-Hu, Taipei, Taiwan,
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Kimani SG, Geng K, Kasikara C, Kumar S, Sriram G, Wu Y, Birge RB. Contribution of Defective PS Recognition and Efferocytosis to Chronic Inflammation and Autoimmunity. Front Immunol 2014; 5:566. [PMID: 25426118 PMCID: PMC4226236 DOI: 10.3389/fimmu.2014.00566] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Accepted: 10/23/2014] [Indexed: 12/14/2022] Open
Abstract
The rapid and efficient clearance of apoptotic cells results in the elimination of auto-antigens and provides a strong anti-inflammatory and immunosuppressive signal to prevent autoimmunity. While professional and non-professional phagocytes utilize a wide array of surface receptors to recognize apoptotic cells, the recognition of phosphatidylserine (PS) on apoptotic cells by PS receptors on phagocytes is the emblematic signal for efferocytosis in metazoans. PS-dependent efferocytosis is associated with the production of anti-inflammatory factors such as IL-10 and TGF-β that function, in part, to maintain tolerance to auto-antigens. In contrast, when apoptotic cells fail to be recognized and processed for degradation, auto-antigens persist, such as self-nucleic acids, which can trigger immune activation leading to autoantibody production and autoimmunity. Despite the fact that genetic mouse models clearly demonstrate that loss of PS receptors can lead to age-dependent auto-immune diseases reminiscent of systemic lupus erythematosus (SLE), the link between PS and defective clearance in chronic inflammation and human autoimmunity is not well delineated. In this perspective, we review emerging questions developing in the field that may be of relevance to SLE and human autoimmunity.
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Affiliation(s)
- Stanley Gititu Kimani
- Department of Biochemistry and Molecular Biology, Rutgers School of Biomedical and Health Sciences - Cancer Center , Newark, NJ , USA
| | - Ke Geng
- Department of Biochemistry and Molecular Biology, Rutgers School of Biomedical and Health Sciences - Cancer Center , Newark, NJ , USA
| | - Canan Kasikara
- Department of Biochemistry and Molecular Biology, Rutgers School of Biomedical and Health Sciences - Cancer Center , Newark, NJ , USA
| | - Sushil Kumar
- Department of Biochemistry and Molecular Biology, Rutgers School of Biomedical and Health Sciences - Cancer Center , Newark, NJ , USA
| | - Ganapathy Sriram
- Department of Biochemistry and Molecular Biology, Rutgers School of Biomedical and Health Sciences - Cancer Center , Newark, NJ , USA
| | - Yi Wu
- Cyrus Tang Hematology Center, Jiangsu Institute of Hematology, First Affiliated Hospital, Soochow University , Suzhou , China ; Sol Sherry Thrombosis Research Center, Temple University School of Medicine , Philadelphia, PA , USA
| | - Raymond B Birge
- Department of Biochemistry and Molecular Biology, Rutgers School of Biomedical and Health Sciences - Cancer Center , Newark, NJ , USA
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Abstract
Three receptor tyrosine kinases, Tyro3, Axl, and Mertk (TAM) and their ligands Gas6 and Protein S, have emerged as potent negative regulators of innate immune responses. A number of studies using genetic ablation of TAM loci in mice have elucidated the mechanism of TAM engagement and function during the immune response and removal of apoptotic cells. Following phagocytosis of apoptotic cells or the induction of T-cell dependent adaptive immune responses, ligand-induced TAM signaling dampens proinflammatory cytokine production and thus prevents exaggerated or prolonged inflammation. It is believed that the TAM pathway may play an important role in the pathogenesis of inflammatory bowel disease. Suppression of inflammation and removal of apoptotic cells followed by tissue repair are essential processes for disease remission and the successful management of inflammatory bowel disease. In light of the key role of TAMs in controlling inflammatory responses, here, we review the recent advances on TAM research vis-à-vis the resolution of intestinal inflammation. Targeted activation of TAM receptor tyrosine kinases may represent a potent therapeutic opportunity in inflammatory bowel disease.
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Tsou WI, Nguyen KQN, Calarese DA, Garforth SJ, Antes AL, Smirnov SV, Almo SC, Birge RB, Kotenko SV. Receptor tyrosine kinases, TYRO3, AXL, and MER, demonstrate distinct patterns and complex regulation of ligand-induced activation. J Biol Chem 2014; 289:25750-63. [PMID: 25074926 DOI: 10.1074/jbc.m114.569020] [Citation(s) in RCA: 165] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
TYRO3, AXL, and MER receptors (TAMs) are three homologous type I receptor-tyrosine kinases that are activated by endogenous ligands, protein S (PROS1) and growth arrest-specific gene 6 (GAS6). These ligands can either activate TAMs as soluble factors, or, in turn, opsonize phosphatidylserine (PS) on apoptotic cells (ACs) and serve as bridging molecules between ACs and TAMs. Abnormal expression and activation of TAMs have been implicated in promoting proliferation and survival of cancer cells, as well as in suppressing anti-tumor immunity. Despite the fact that TAM receptors share significant similarity, little is known about the specificity of interaction between TAM receptors and their ligands, particularly in the context of ACs, and about the functional diversity of TAM receptors. To study ligand-mediated activation of TAMs, we generated a series of reporter cell lines expressing chimeric TAM receptors. Using this system, we found that each TAM receptor has a unique pattern of interaction with and activation by GAS6 and PROS1, which is also differentially affected by the presence of ACs, PS-containing lipid vesicles and enveloped virus. We also demonstrated that γ-carboxylation of ligands is essential for the full activation of TAMs and that soluble immunoglobulin-like TAM domains act as specific ligand antagonists. These studies demonstrate that, despite their similarity, TYRO3, AXL, and MER are likely to perform distinct functions in both immunoregulation and the recognition and removal of ACs.
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Affiliation(s)
- Wen-I Tsou
- From the Department of Biochemistry and Molecular Biology, University Hospital Cancer Center and Center for Immunity and Inflammation, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey 07103, and
| | - Khanh-Quynh N Nguyen
- From the Department of Biochemistry and Molecular Biology, University Hospital Cancer Center and
| | | | | | - Anita L Antes
- From the Department of Biochemistry and Molecular Biology, University Hospital Cancer Center and
| | - Sergey V Smirnov
- From the Department of Biochemistry and Molecular Biology, University Hospital Cancer Center and Center for Immunity and Inflammation, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey 07103, and
| | - Steve C Almo
- the Department of Biochemistry and Albert Einstein Cancer Center, Albert Einstein College of Medicine of Yeshiva University, Bronx, New York 10461
| | - Raymond B Birge
- From the Department of Biochemistry and Molecular Biology, University Hospital Cancer Center and
| | - Sergei V Kotenko
- From the Department of Biochemistry and Molecular Biology, University Hospital Cancer Center and Center for Immunity and Inflammation, New Jersey Medical School, Rutgers Biomedical and Health Sciences, Newark, New Jersey 07103, and
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Kim HA, Nam JY, Jung JY, Bae CB, An JM, Jeon JY, Kim BS, Suh CH. Serum growth arrest-specific protein 6 levels are elevated in adult-onset Still's disease. Clin Rheumatol 2014; 33:865-8. [PMID: 24770797 DOI: 10.1007/s10067-014-2629-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 04/11/2014] [Accepted: 04/11/2014] [Indexed: 10/25/2022]
Abstract
We investigated the growth arrest-specific protein 6 in adult-onset Still's disease. Serums were collected from 52 adult-onset Still's disease patients with follow-up samples of 21 patients. The growth arrest-specific protein 6 levels in adult-onset Still's disease were higher compared to those in the normal controls (25.37±7.71 vs. 19.86±5.01 ng/mL, p<0.001). However, growth arrest-specific protein 6 did not correlate with disease activity. Also, growth arrest-specific protein 6 was not decreased after activity was resolved in the follow-up. The growth arrest-specific protein 6 in adult-onset Still's disease patients were higher than the normal controls. However, growth arrest-specific protein 6 was not correlated with disease activity.
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Affiliation(s)
- Hyoun-Ah Kim
- Department of Rheumatology, Ajou University School of Medicine, San 5, Wonchon-dong, Yeongtong-gu, Suwon, 443-721, South Korea
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Abstract
Abstract
TAM receptors (Tyro3, Axl, and Mer) belong to a family of receptor tyrosine kinases that have important effects on hemostasis and inflammation. Also, they affect cell proliferation, survival, adhesion, and migration. TAM receptors can be activated by the vitamin K–dependent proteins Gas6 and protein S. Protein S is more commonly known as an important cofactor for protein C as well as a direct inhibitor of multiple coagulation factors. To our knowledge, the functions of Gas6 are limited to TAM receptor activation. When activated, the TAM receptors have effects on primary hemostasis and coagulation and display an anti-inflammatory or a proinflammatory effect, depending on cell type. To comprehend the effects that the TAM receptors and their ligands have on hemostasis and inflammation, we compare studies that report the different phenotypes displayed by mice with deficiencies in the genes of this receptor family and its ligands (protein S+/−, Gas6−/−, TAM−/−, and variations of these). In this manner, we aim to display which features are attributable to the different ligands. Because of the effects TAM receptors have on hemostasis, inflammation, and cancer growth, their modulation could make interesting therapeutic targets in thromboembolic disease, atherosclerosis, sepsis, autoimmune disease, and cancer.
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Shao WH, Cohen PL. The role of tyrosine kinases in systemic lupus erythematosus and their potential as therapeutic targets. Expert Rev Clin Immunol 2014; 10:573-82. [PMID: 24678775 DOI: 10.1586/1744666x.2014.893827] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The autoimmune disease systemic lupus erythematosus is characterized by loss of tolerance to nuclear antigens. Breakdown of tolerance is associated with alterations in T-cell and B-cell receptor signal transduction, including increased protein phosphorylation that may underlie pathogenesis and explain the characteristic hyperactivity of T and B cells and other immune cells in active disease. Tyrosine kinases play a central role in signaling processes in cells known to be important in the pathogenesis of autoimmune diseases. Considerable progress has been made in understanding the function of tyrosine kinases in immune cell signaling pathways. In this review, we will summarize the function of tyrosine kinases and their novel inhibitors from studies made in animal lupus models and systemic lupus erythematosus patients.
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Affiliation(s)
- Wen-Hai Shao
- Department of Medicine and Temple Autoimmunity Center, Section of Rheumatology, Temple University, Philadelphia, PA, USA
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Increased expression of Mer tyrosine kinase in circulating dendritic cells and monocytes of lupus patients: correlations with plasma interferon activity and steroid therapy. Arthritis Res Ther 2014; 16:R76. [PMID: 24650765 PMCID: PMC4060208 DOI: 10.1186/ar4517] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 03/06/2014] [Indexed: 12/15/2022] Open
Abstract
INTRODUCTION The requirement for the immunoregulatory Mer tyrosine kinase (Mer) for optimal removal of apoptotic cells prompted us to look at its expression in systemic lupus erythematosus (SLE), in which apoptotic cell clearance is abnormal. We compared the levels of expression of Mer in normal human subjects and in patients with SLE. METHODS We used flow cytometry of isolated peripheral blood mononuclear cells to compare the levels of Mer on leukocyte subsets. We used a Mer-specific enzyme-linked immunosorbent assay (ELISA) to quantify soluble Mer (sMer) in plasmas. RESULTS Monocytes, CD1c⁺ myeloid dendritic cells (mDCs), and plasmacytoid dendritic cells (pDCs) from both normal individuals and from SLE patients expressed Mer. In both normal and SLE patients, the CD14⁺⁺CD16⁺ subpopulation of monocytes expressed the highest levels of Mer, with somewhat lower levels on the CD14(int)CD16⁺ population. Mer levels on CD1c⁺ mDCs and pDCs, and sMer levels in blood were increased in SLE patients compared with controls. In patients, Mer levels on CD14(int)CD16⁺, CD14⁺⁺CD16⁻ monocytes, and CD1c⁺ dendritic cells correlated positively with type I interferon (IFN-I) activity detected in blood. In SLE patients treated with corticosteroids, Mer expression on monocytes correlated with prednisone dose, CD1c⁺ myeloid dendritic cells in patients treated with prednisone had higher levels of Mer expression than those in patients not receiving prednisone. CONCLUSIONS We found no global defect in Mer expression in lupus blood. In contrast, we observed increased levels of Mer expression in DC populations, which could represent a response to increased IFN-I in SLE patients. Enhanced Mer expression induced by corticosteroids may contribute to its beneficial effects in SLE.
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The expression and clinical significance of different forms of Mer receptor tyrosine kinase in systemic lupus erythematosus. J Immunol Res 2014; 2014:431896. [PMID: 24741600 PMCID: PMC3987794 DOI: 10.1155/2014/431896] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Revised: 01/27/2014] [Accepted: 01/27/2014] [Indexed: 01/11/2023] Open
Abstract
OBJECTIVE To investigate the expression and clinical significance of trans-membrane MerTK (mMer) on circulating CD14+ monocytes/macrophages and soluble MerTK (sMer) levels in plasma in systemic lupus erythematosus (SLE). METHOD 108 SLE patients and 42 healthy controls were recruited in this study. The expression of mMer on the surfaces of CD14+ monocytes/macrophages was evaluated by flow cytometry (FCM). The sMer levels were measured by ELISA. Real-time quantitative PCR was applied to evaluate the mRNA levels of MerTK and ADAM17. RESULTS Both mMer expression on CD14+ monocytes/macrophages and sMer levels in plasma significantly increased in SLE patients compared to healthy subjects. The frequency of anti-inflammatory MerTK expressing CD14+CD16+ monocytes decreased in SLE. mMer expression was positively correlated with CD163 expression on CD14+ cells. Both the mMer expression on CD14+ monocytes/macrophages and sMer levels in plasma were positively correlated with SLEDAI. Furthermore, more elevated mMer and sMer levels were found in patients with higher SLEDAI, presence of anti-SSA, anti-Sm autoantibodies, and lupus nephritis. CONCLUSION Both mMer and sMer levels significantly increased in SLE and positively correlated with disease activity and severity. The upregulation of MerTK expression may serve as a biomarker of the disease activity and severity of SLE.
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Zhu H, Sun X, Zhu L, Hu F, Shi L, Fan C, Li Z, Su Y. Different expression patterns and clinical significance of mAxl and sAxl in systemic lupus erythematosus. Lupus 2014; 23:624-34. [PMID: 24474706 DOI: 10.1177/0961203314520839] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2013] [Accepted: 12/23/2013] [Indexed: 11/17/2022]
Abstract
Axl is one of the TAM family members that downregulates activated immune responses to maintain immune homeostasis. We analyzed the expression and clinical relevance of Axl on the surface of CD14+ monocytes/macrophages (mAxl, membrane Axl) and in the plasma (sAxl, soluble Axl) from patients with systemic lupus erythematosus (SLE). Compared to healthy subjects, the concentrations of sAxl were significantly elevated in plasma from SLE patients, while the mAxl expression on CD14+ monocytes/macrophages from SLE patients was significantly downregulated. A series of severe disease clinical manifestations and laboratory features such as presence of autoantibodies, 24-hour proteinuria excretion or SLEDAI ≥10 were associated with decreased mAxl expression on monocytes/macrophages but elevated sAxl levels in plasma. The plasma level of Gas6, the main ligand of Axl, was slightly decreased in SLE patients, and was negatively correlated with anti-dsDNA antibodies and C-reactive protein. SLE patients with SLEDAI ≥10 showed significantly lower Gas6 levels. Our study suggests that abnormal mAxl and sAxl expression may be involved in the imbalance of immune regulation in SLE.
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Affiliation(s)
- H Zhu
- Department of Rheumatology and Immunology, Clinical Immunology Center, Peking University People’s Hospital, Beijing, China
| | - X Sun
- Department of Rheumatology and Immunology, Clinical Immunology Center, Peking University People’s Hospital, Beijing, China
| | - L Zhu
- Department of Rheumatology and Immunology, Clinical Immunology Center, Peking University People’s Hospital, Beijing, China
| | - F Hu
- Department of Rheumatology and Immunology, Clinical Immunology Center, Peking University People’s Hospital, Beijing, China
| | - L Shi
- Department of Rheumatology and Immunology, Clinical Immunology Center, Peking University People’s Hospital, Beijing, China
| | - C Fan
- Department of Laboratory Medicine, Peking University People’s Hospital, Beijing, China
| | - Z Li
- Department of Rheumatology and Immunology, Clinical Immunology Center, Peking University People’s Hospital, Beijing, China
| | - Y Su
- Department of Rheumatology and Immunology, Clinical Immunology Center, Peking University People’s Hospital, Beijing, China
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Correction: Vitamin K-dependent proteins GAS6 and Protein S and TAM receptors in patients of systemic lupus erythematosus: correlation with common genetic variants and disease activity. Arthritis Res Ther 2014. [PMCID: PMC3978687 DOI: 10.1186/ar4485] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Tian G, Li JL, Pan HF, Zhou D. New evidence for roles of growth arrest-specific protein 6 (Gas6) in systemic lupus erythematosus. Rheumatol Int 2013; 34:1171-2. [PMID: 24306267 DOI: 10.1007/s00296-013-2911-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Accepted: 11/25/2013] [Indexed: 11/25/2022]
Affiliation(s)
- Guo Tian
- School of Health Management, Anhui Medical University, 81 Meishan Road, Hefei, 230032, Anhui, People's Republic of China
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Majai G, Kiss E, Tarr T, Zahuczky G, Hartman Z, Szegedi G, Fésüs L. Decreased apopto-phagocytic gene expression in the macrophages of systemic lupus erythematosus patients. Lupus 2013; 23:133-45. [PMID: 24285095 DOI: 10.1177/0961203313511557] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The clearance of apoptotic cells has an important role in the maintenance of tissue homeostasis and in the protection of tissues from the inflammatory and immunogenic contents of dying cells. A defect in the recognition and phagocytosis of apoptotic cells contributes to the development of chronic inflammation and autoimmune disorders. We have observed that compared with healthy donors, differentiated macrophages from patients with untreated systemic lupus erythematosus (SLE) showed decreased phagocytosis of apoptotic neutrophils. A TaqMan Low Density Array was designed to determine the mRNA expression levels of 95 apopto-phagocytic genes in differentiated non-phagocytosing and phagocytosing macrophages. In the macrophages of clinically and immunoserologically active SLE patients, 39 genes were expressed at lower levels than in the control macrophages. When inactive patients were compared with those with minor immunoserological abnormalities or patients in an immunoserologically active state, a relationship was observed between the altered gene expression profile and the disease state. In the macrophages of patients with engulfing apoptotic cells, an upregulation of genes involved in inflammation, autophagy, and signaling was observed. These results indicate that novel immune-pathological pathways are involved in SLE and suggest targets for potential therapeutic modulation.
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Affiliation(s)
- G Majai
- 1Department of Biochemistry and Molecular Biology, Apoptosis and Genomics Research Group of the Hungarian Academy of Sciences, University of Debrecen, Debrecen, Hungary
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Chen C, Liao D, Wang J, Liang Z, Yao Q. Anti-human protein S antibody induces tissue factor expression through a direct interaction with platelet phosphofructokinase. Thromb Res 2013; 133:222-8. [PMID: 24331211 DOI: 10.1016/j.thromres.2013.11.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 10/18/2013] [Accepted: 11/12/2013] [Indexed: 10/26/2022]
Abstract
INTRODUCTION Autoantibodies including anti-human protein S antibody (anti-hPS Ab) and anti-human protein C antibody (anti-hPC Ab) can be detected in patients with autoimmune diseases with hypercoagulability. The objective of the present study was to determine the effects and molecular pathways of these autoantibodies on tissue factor (TF) expression in human coronary artery endothelial cells (HCAECs). MATERIALS AND METHODS HCAECs were treated with anti-hPS Ab or anti-hPC Ab for 3 hours. TF expression was measured by real-time PCR and Western blot. TF-mediated procoagulant activity was determined by a commercial kit. MAPK phosphorylation was analyzed by Bio-Plex luminex immunoassay and Western blot. The potential proteins interacting with anti-hPS Ab were studied by immunoprecipitation, mass spectrometry and in vitro pull-down assay. RESULTS Anti-hPS Ab, but not anti-hPC Ab, specifically induced TF expression and TF-mediated procoagulant activity in HCAECs in a concentration-dependent manner. This effect was confirmed in human umbilical endothelial cells (HUVECs). ERK1/2 phosphorylation was induced by anti-hPS Ab treatment, while inhibition of ERK1/2 by U0216 partially blocked anti-hPS Ab-induced TF upregulation (P<0.05). In addition, anti-hPS Ab specifically cross-interacted with platelet phosphofructokinase (PFKP) in HCAECs. Anti-hPS Ab was able to directly inhibit PFKP activities in HCAECs. Furthermore, silencing of PFKP by PFKP shRNA resulted in TF upregulation in HCAECs, while activation of PFKP by fructose-6-phosphate partially blocked the effect of anti-hPS Ab on TF upregulation (P<0.05). CONCLUSIONS Anti-hPS Ab induces TF expression through a direct interaction with PFKP and ERK1/2 activation in HCAECs. Anti-hPS Ab may directly contribute to vascular thrombosis in the patient with autoimmune disorders.
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Affiliation(s)
- Changyi Chen
- Molecular Surgeon Research Center, Division of Surgical Research, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA.
| | - Dan Liao
- Molecular Surgeon Research Center, Division of Surgical Research, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - Jing Wang
- Molecular Surgeon Research Center, Division of Surgical Research, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - Zhengdong Liang
- Molecular Surgeon Research Center, Division of Surgical Research, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
| | - Qizhi Yao
- Molecular Surgeon Research Center, Division of Surgical Research, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA
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Elevated serum level of growth arrest-specific protein 6 (Gas6) in systemic lupus erythematosus patients is associated with nephritis and cutaneous vasculitis. Rheumatol Int 2013; 34:625-9. [PMID: 24178067 DOI: 10.1007/s00296-013-2882-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Accepted: 10/11/2013] [Indexed: 10/26/2022]
Abstract
Growth arrest-specific protein 6 (Gas6) is a serum protein involved in granulocyte, platelet and endothelium interaction, and is implicated in both anti-inflammatory response as well as platelet/leukocytes activation. We investigated serum Gas6 level in different clinical manifestations of systemic lupus erythematosus (SLE). Data were collected in 83 patients with SLE and 40 non-lupus controls. The Gas6 levels were detected by enzyme-linked immunosorbent assay. Our results demonstrated that the Gas6 level was higher in SLE patients as compared to the non-lupus control subjects (SLE vs. non-lupus control, median [inter-quartile range (IQR)] 22.67 [19.40-28.60] vs. 18.97 [16.05-20.62] ng/mL, p < 0.01). Furthermore, Gas6 level was higher in patients with nephritis (nephritis vs. non-nephritis, median [IQR] 26.21 [21.17-31.61] vs. 22.22 [18.98-26.98] ng/mL, p = 0.03) and in patients with cutaneous vasculitis (vasculitis vs. non-vasculitis, median [IQR] 27.89 [23.24-34.26] vs. 22.30 [19.32-27.16] ng/mL, p = 0.03). Our results indicate that the serum Gas6 level is increased in SLE patients with lupus nephritis or cutaneous vasculitis, implicating a potential to serve as a SLE disease activity marker.
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Abstract
The TAM receptors--Tyro3, Axl, and Mer--comprise a unique family of receptor tyrosine kinases, in that as a group they play no essential role in embryonic development. Instead, they function as homeostatic regulators in adult tissues and organ systems that are subject to continuous challenge and renewal throughout life. Their regulatory roles are prominent in the mature immune, reproductive, hematopoietic, vascular, and nervous systems. The TAMs and their ligands--Gas6 and Protein S--are essential for the efficient phagocytosis of apoptotic cells and membranes in these tissues; and in the immune system, they act as pleiotropic inhibitors of the innate inflammatory response to pathogens. Deficiencies in TAM signaling are thought to contribute to chronic inflammatory and autoimmune disease in humans, and aberrantly elevated TAM signaling is strongly associated with cancer progression, metastasis, and resistance to targeted therapies.
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Affiliation(s)
- Greg Lemke
- Molecular Neurobiology Laboratory, Immunobiology and Microbial Pathogenesis Laboratory, The Salk Institute, La Jolla, California 92037
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Jung JY, Bae CB, Suh CH. Promising biomarkers for systemic lupus erythematosus. ACTA ACUST UNITED AC 2013; 7:601-13. [DOI: 10.1517/17530059.2013.846323] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Suleiman L, Négrier C, Boukerche H. Protein S: A multifunctional anticoagulant vitamin K-dependent protein at the crossroads of coagulation, inflammation, angiogenesis, and cancer. Crit Rev Oncol Hematol 2013; 88:637-54. [PMID: 23958677 DOI: 10.1016/j.critrevonc.2013.07.004] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 06/18/2013] [Accepted: 07/17/2013] [Indexed: 01/09/2023] Open
Abstract
Since its discovery in 1970, protein S (PS) has emerged as a key vitamin K-dependent natural anticoagulant protein at the crossroads of multiple biological processes, including coagulation, apoptosis, atherosclerosis, angiogenesis/vasculogenesis, and cancer progression. Following the binding to a unique family of protein tyrosine kinase receptors referred to as Tyro-3, Axl and Mer (TAM) receptors, PS can lead to regulation of coagulation, phagocytosis of apoptotic cells, cell survival, activation of innate immunity, vessel integrity and angiogenesis, and local invasion and metastasis. Because of these dynamics and multiple functions of PS, which are largely lost following invalidation of the mouse PROS1 gene, this molecule is currently intensively studied in biomedical research. The purpose of this review is to provide a brief chronicle of the discovery and current understanding of the mechanisms of PS signaling, and how PS and their signaling partners regulate various cellular functions, with a particular focus on TAM receptors.
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Affiliation(s)
- Lutfi Suleiman
- University Claude Bernard, Lyon I, INSERM, Department of Onco-Haematology, EA 4174, France
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