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Wu J, Li Y, Rendahl A, Bhargava M. Novel Human FCGR1A Variants Affect CD64 Functions and Are Risk Factors for Sarcoidosis. Front Immunol 2022; 13:841099. [PMID: 35371020 PMCID: PMC8968912 DOI: 10.3389/fimmu.2022.841099] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 02/24/2022] [Indexed: 12/19/2022] Open
Abstract
CD64 (or FcγRIA) is the sole functional high affinity IgG Fc receptor coded by FCGR1A gene in humans. The FCGR1A genetics has not been comprehensively investigated and effects of human FCGR1A variants on immune functions remain unknown. In the current study, we identified three novel FCGR1A variants including the single nucleotide variant (SNV) rs1848781 (c.-131) in the proximal FCGR1A gene promoter region, the rs587598788 indel variant within the FCGR1A intron 5, and the non-synonymous SNV rs1050204 (c.970G>A or FcγRIA-p.D324N) in the FCGR1A coding region. Genotype-phenotype analyses revealed that SNV rs1848781 genotypes were significantly associated with CD64 expression levels. Promoter reporter assays show that rs1848781G allele had significantly higher promoter activity than the rs1848781C, confirming that the rs1848781 is a functional FCGR1A SNV affecting promoter activity and gene expression. The rs587598788 indel genotypes were also significantly associated with levels of CD64 expression. Moreover, the non-synonymous SNV rs1050204 (FcγRIA-p.D324N) alleles significantly affected CD64-mediated phagocytosis, degranulation, and pro-inflammatory cytokine productions. Genetic analyses revealed that FCGR1A genotypes were significantly associated with sarcoidosis susceptibility and severity. Our data suggest that FCGR1A genetic variants may affect immune responses and play a role in sarcoidosis.
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Affiliation(s)
- Jianming Wu
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, MN, United States
- *Correspondence: Jianming Wu, ; orcid.org/000-0001-9142-7066
| | - Yunfang Li
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, MN, United States
| | - Aaron Rendahl
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, MN, United States
| | - Maneesh Bhargava
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Department of Medicine, School of Medicine, University of Minnesota, Minneapolis, MN, United States
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Nuutila J, Hohenthal U, Oksi J, Jalava-Karvinen P. Rapid detection of bacterial infection using a novel single-tube, four-colour flow cytometric method: Comparison with PCT and CRP. EBioMedicine 2021; 74:103724. [PMID: 34844193 PMCID: PMC8633870 DOI: 10.1016/j.ebiom.2021.103724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 11/04/2021] [Accepted: 11/16/2021] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND A key factor behind the unnecessary use of antibiotics is the lack of rapid and accurate diagnostic tests. In this study, we developed a novel and fast flow cytometric single-tube method to detect bacterial infections within 30 minutes. METHODS Quantitative flow cytometric four-colour analysis of host biomarkers CD35, CD64, CD329, and MHC class I expression on neutrophils and lymphocytes was performed on samples taken from 841 febrile patients with suspected infection. Obtained data was incorporated into the four-colour bacterial infection (FCBI)-index, using the developed bacterial infection algorithm. FINDINGS In distinguishing between microbiologically confirmed bacterial (n = 193) and viral (n = 291) infections, the FCBI-index method was superior to serum C-reactive protein (CRP) and procalcitonin (PCT). In 269 confirmed viral respiratory tract infections, 43% (95% CI: 37-49%) of the patients had an increased FCBI-index, suggesting probable bacterial coinfection. INTERPRETATION The proposed FCBI-index test might be a potent additional tool when assessing appropriateness of empiric antibiotic treatment. FUNDING This study has been financially supported by Turku University Hospital (Turku, Finland) and The Finnish Medical Foundation.
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Affiliation(s)
- Jari Nuutila
- Department of Life Technologies, University of Turku, Turku, Finland.
| | - Ulla Hohenthal
- Turku University Hospital, Department of Medicine, Turku, Finland; Faculty of Medicine, University of Turku, Turku, Finland
| | - Jarmo Oksi
- Turku University Hospital, Department of Medicine, Turku, Finland; Faculty of Medicine, University of Turku, Turku, Finland
| | - Päivi Jalava-Karvinen
- Turku University Hospital, Department of Medicine, Turku, Finland; Faculty of Medicine, University of Turku, Turku, Finland
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3
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Hintz HM, Snyder KM, Wu J, Hullsiek R, Dahlvang JD, Hart GT, Walcheck B, LeBeau AM. Simultaneous Engagement of Tumor and Stroma Targeting Antibodies by Engineered NK-92 Cells Expressing CD64 Controls Prostate Cancer Growth. Cancer Immunol Res 2021; 9:1270-1282. [PMID: 34452926 PMCID: PMC9119026 DOI: 10.1158/2326-6066.cir-21-0178] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 06/20/2021] [Accepted: 08/24/2021] [Indexed: 11/16/2022]
Abstract
Metastatic castration-resistant prostate cancer (mCRPC) has been largely resistant to immunotherapy. Natural killer (NK) cells are cytotoxic lymphocytes that detect and kill transformed cells without prior sensitization, and their infiltration into prostate tumors corresponds with an increased overall survival among patients with mCRPC. We sought to harness this knowledge to develop an approach to NK-cell based immunotherapy for mCRPC. We engineered an NK cell line (NK-92MI) to express CD64, the sole human high-affinity IgG Fcγ receptor (FcγR1), and bound these cells with antibodies to provide interchangeable tumor-targeting elements. NK-92MICD64 cells were evaluated for cell-activation mechanisms and antibody-dependent cell-mediated cytotoxicity (ADCC). A combination of mAbs was used to target the prostate tumor antigen tumor-associated calcium signal transducer 2 (TROP2) and the cancer-associated fibroblast marker fibroblast activation protein alpha (FAP). We found that CD64, which is normally expressed by myeloid cells and associates with the adaptor molecule FcRγ, can be expressed by NK-92MI cells and mediate ADCC through an association with CD3ζ. Cytotoxicity from the combination approach was two-fold higher compared to treatment with NK-92MICD64 cells and either mAb alone, and seven-fold higher than NK-92MICD64 cells alone at an effector-target cell ratio of 20:1. The cytotoxic effect was lost when using isotype control antibodies, indicating a selective targeting mechanism. The combination approach demonstrated efficacy in vivo as well and significantly reduced tumor growth compared with the saline control. This combination therapy presents a potential approach for treating mCRPC and could improve immunotherapy response.
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Affiliation(s)
- Hallie M Hintz
- Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota
| | - Kristin M Snyder
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Saint Paul, Minnesota
| | - Jianming Wu
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Saint Paul, Minnesota
| | - Robert Hullsiek
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Saint Paul, Minnesota
| | - James D Dahlvang
- Department of Medicine, Division of Infectious Disease and International Medicine, University of Minnesota Medical School, Minneapolis, Minnesota
| | - Geoffrey T Hart
- Department of Medicine, Division of Infectious Disease and International Medicine, University of Minnesota Medical School, Minneapolis, Minnesota
- Center for Immunology, University of Minnesota Medical School, Minneapolis, Minnesota
| | - Bruce Walcheck
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Saint Paul, Minnesota.
- Center for Immunology, University of Minnesota Medical School, Minneapolis, Minnesota
| | - Aaron M LeBeau
- Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota.
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4
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Shi P, Su Y, Li Y, Zhang L, Lu D, Li R, Zhang L, Huang J. The alternatively spliced porcine FcγRI regulated PRRSV-ADE infection and proinflammatory cytokine production. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2019; 90:186-198. [PMID: 30273630 DOI: 10.1016/j.dci.2018.09.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 09/25/2018] [Accepted: 09/25/2018] [Indexed: 06/08/2023]
Abstract
Receptors for the Fc region of IgG (FcγRs) play a key role in protecting the immune system and host from infection. In this study, we described the cloning, sequencing and characterization of porcine FcγRI, and reported six different FcγRI isoforms, four of which have never been reported before. Further analysis revealed that FcγR isoforms are generated by alternative splicing mechanisms, including two membrane isoforms and four soluble isoforms. Importantly, we found FcγRI splice variants differentially influence PRRSV antibody-dependent enhancement (ADE) effects. Membrane pCD64-T1 promotes endocytosis of the PRRSV-antibody complex to enhance PRRSV replication, and soluble pCD64-T3 has no ADE effect on PRRSV proliferation, but shows an inflammation enhancement effect. The differential expression of selective splicing in primary PAM cells and 3D4/21 cell lines are altered and regulated by PRRSV infection and inflammatory environment. Our results indicated that porcine FcγRI plays dual regulatory roles in PRRSV multiplication and PRRSV inflammation process by the alternatively spliced mechanism, which will be a new target in PRRSV prevention and control.
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Affiliation(s)
- Peidian Shi
- School of Life Sciences, Tianjin University, Tianjin, 300072, China
| | - Yanxin Su
- School of Life Sciences, Tianjin University, Tianjin, 300072, China
| | - Yi Li
- School of Life Sciences, Tianjin University, Tianjin, 300072, China
| | - Lilin Zhang
- School of Life Sciences, Tianjin University, Tianjin, 300072, China
| | - Dong Lu
- School of Life Sciences, Tianjin University, Tianjin, 300072, China
| | - Ruiqiao Li
- School of Life Sciences, Tianjin University, Tianjin, 300072, China
| | - Lei Zhang
- School of Life Sciences, Tianjin University, Tianjin, 300072, China.
| | - Jinhai Huang
- School of Life Sciences, Tianjin University, Tianjin, 300072, China.
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5
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Brandsma AM, Schwartz SL, Wester MJ, Valley CC, Blezer GLA, Vidarsson G, Lidke KA, Ten Broeke T, Lidke DS, Leusen JHW. Mechanisms of inside-out signaling of the high-affinity IgG receptor FcγRI. Sci Signal 2018; 11:11/540/eaaq0891. [PMID: 30042128 DOI: 10.1126/scisignal.aaq0891] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Fc receptors (FcRs) are an important bridge between the innate and adaptive immune system. Fc gamma receptor I (FcγRI; CD64), the high-affinity receptor for immunoglobulin G (IgG), plays roles in inflammation, autoimmune responses, and immunotherapy. Stimulation of myeloid cells with cytokines, such as tumor necrosis factor-α ( TNFα) and interferon-γ ( IFNγ), increases the binding of FcγRI to immune complexes (ICs), such as antibody-opsonized pathogens or tumor cells, through a process known as "inside-out" signaling. Using super-resolution imaging, we found that stimulation of cells with IL-3 also enhanced the clustering of FcγRI both before and after exposure to ICs. This increased clustering was dependent on an intact actin cytoskeleton. We found that chemical inhibition of the activity of the phosphatase PP1 reduced FcγRI inside-out signaling, although the phosphorylation of FcγRI itself was unaffected. Furthermore, the antibody-dependent cytotoxic activity of human neutrophils toward CD20-expressing tumor cells was increased after stimulation with TNFα and IFNγ. These results suggest that nanoscale reorganization of FcγRI, stimulated by cytokine-induced, inside-out signaling, enhances FcγRI cellular effector functions.
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Affiliation(s)
- Arianne M Brandsma
- Immunotherapy Laboratory, Laboratory for Translational Immunology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Samantha L Schwartz
- Department of Pathology and Comprehensive Cancer Center, University of New Mexico, Albuquerque, NM 87102, USA
| | - Michael J Wester
- Department of Pathology and Comprehensive Cancer Center, University of New Mexico, Albuquerque, NM 87102, USA
| | - Christopher C Valley
- Department of Pathology and Comprehensive Cancer Center, University of New Mexico, Albuquerque, NM 87102, USA
| | - Gittan L A Blezer
- Immunotherapy Laboratory, Laboratory for Translational Immunology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Gestur Vidarsson
- Sanquin Research and Landsteiner Laboratory, Department of Experimental Hematology, Academic Medical Center, University of Amsterdam, Amsterdam, Netherlands
| | - Keith A Lidke
- Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131, USA
| | - Toine Ten Broeke
- Immunotherapy Laboratory, Laboratory for Translational Immunology, University Medical Center Utrecht, Utrecht, Netherlands
| | - Diane S Lidke
- Department of Pathology and Comprehensive Cancer Center, University of New Mexico, Albuquerque, NM 87102, USA
| | - Jeanette H W Leusen
- Immunotherapy Laboratory, Laboratory for Translational Immunology, University Medical Center Utrecht, Utrecht, Netherlands.
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Brandsma AM, Jacobino SR, Meyer S, ten Broeke T, Leusen JHW. Fc receptor inside-out signaling and possible impact on antibody therapy. Immunol Rev 2015; 268:74-87. [DOI: 10.1111/imr.12332] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Arianne M. Brandsma
- Immunotherapy Laboratory; Laboratory for Translational Immunology; UMC Utrecht; Utrecht The Netherlands
| | - Shamir R. Jacobino
- Immunotherapy Laboratory; Laboratory for Translational Immunology; UMC Utrecht; Utrecht The Netherlands
| | - Saskia Meyer
- Immunotherapy Laboratory; Laboratory for Translational Immunology; UMC Utrecht; Utrecht The Netherlands
| | - Toine ten Broeke
- Immunotherapy Laboratory; Laboratory for Translational Immunology; UMC Utrecht; Utrecht The Netherlands
| | - Jeanette H. W. Leusen
- Immunotherapy Laboratory; Laboratory for Translational Immunology; UMC Utrecht; Utrecht The Netherlands
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Chenoweth AM, Trist HM, Tan PS, Wines BD, Hogarth PM. The high-affinity receptor for IgG, FcγRI, of humans and non-human primates. Immunol Rev 2015; 268:175-91. [DOI: 10.1111/imr.12366] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Alicia M. Chenoweth
- Centre for Biomedicine; Burnet Institute; Melbourne Vic. Australia
- Department of Immunology; Monash University; Melbourne Vic. Australia
| | - Halina M. Trist
- Centre for Biomedicine; Burnet Institute; Melbourne Vic. Australia
| | - Peck-Szee Tan
- Centre for Biomedicine; Burnet Institute; Melbourne Vic. Australia
| | - Bruce D. Wines
- Centre for Biomedicine; Burnet Institute; Melbourne Vic. Australia
- Department of Immunology; Monash University; Melbourne Vic. Australia
- Department of Pathology; University of Melbourne; Melbourne Vic. Australia
| | - P. Mark Hogarth
- Centre for Biomedicine; Burnet Institute; Melbourne Vic. Australia
- Department of Immunology; Monash University; Melbourne Vic. Australia
- Department of Pathology; University of Melbourne; Melbourne Vic. Australia
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8
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Li X, Baskin JG, Mangan EK, Su K, Gibson AW, Ji C, Edberg JC, Kimberly RP. The unique cytoplasmic domain of human FcγRIIIA regulates receptor-mediated function. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2012; 189:4284-94. [PMID: 23024279 PMCID: PMC3478424 DOI: 10.4049/jimmunol.1200704] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Ligand specificity characterizes receptors for Abs and many other immune receptors, but the common use of the FcR γ-chain as their signaling subunit challenges the concept that these receptors are functionally distinct. We hypothesized that elements for specificity might be determined by the unique cytoplasmic domain (CY) sequences of the ligand-binding α-chains of γ-chain-associated receptors. Among Fcγ receptors, a protein kinase C (PKC) phosphorylation consensus motif [RSSTR], identified within the FcγRIIIa (CD16A) CY by in silico analysis, is specifically phosphorylated by PKCs, unlike other FcRs. Phosphorylated CD16A mediates a more robust calcium flux, tyrosine phosphorylation of Syk, and proinflammatory cytokine production, whereas nonphosphorylatable CD16A is more effective at activation of the Gab2/PI3K pathway, leading to enhanced degranulation. S100A4, a specific protein-binding partner for CD16A-CY newly identified by yeast two-hybrid analysis, inhibits phosphorylation of CD16A-CY by PKC in vitro, and reduction of S100A4 levels in vivo enhances receptor phosphorylation upon cross-linking. Taken together, PKC-mediated phosphorylation of CD16A modulates distinct signaling pathways engaged by the receptor. Calcium-activated binding of S100A4 to CD16A, promoted by the initial calcium flux, attenuates the phosphorylation of CY, and, acting as a molecular switch, may both serve as a negative feedback on cytokine production pathways during sustained receptor engagement and favor a shift to degranulation, consistent with the importance of granule release following conjugate formation between CD16A(+) effector cells and target cells. This switch mechanism points to new therapeutic targets and provides a framework for understanding novel receptor polymorphisms.
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Affiliation(s)
- Xiaoli Li
- Division of Clinical Immunology and Rheumatology, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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9
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Fet NG, Fiebeler A, Klinge U, Park JK, Barth S, Thepen T, Tolba RH. Reduction of activated macrophages after ischaemia-reperfusion injury diminishes oxidative stress and ameliorates renal damage. Nephrol Dial Transplant 2012; 27:3149-55. [PMID: 22402584 DOI: 10.1093/ndt/gfr792] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Macrophages are major effectors of the local inflammatory response syndrome (LIRS) and influence the extent of ischaemia/reperfusion injury, thereby impacting organ function. Several subgroups of macrophages exist, representing distinct modes of action. The specific role of the subset expressing Fc gamma receptor (FcγR) 1 in the activated state of macrophages is poorly defined. METHODS We induced a LIRS via 30 min of ischaemia in uninephrectomized rats, transgenic for the human FcγR1. Six hours after reperfusion, the treatment group was injected with a recombinant immunotoxin (IT) H22(scFv)-ETA' targeted against human FcγR1, which induced apoptosis of target cells. The placebo group received normal saline (NS). Contralateral kidneys served as healthy controls (Ctr). After 24 h of reperfusion, the animals were analysed. RESULTS Targeted treatment with IT resulted in preserved renal function [NS versus IT treatment and baseline (creatinine: 69.2 ± 2.6, 54.7 ± 3.4 and 27.3 ± 1.0 μmol/L; P < 0.001)]. The number of all infiltrating monocytes were significantly reduced (CD68-positive cells per view field: NS 3.8 ± 0.4, IT 2.5 ± 0.2 and Ctr 1.2 ± 0.4; P < 0.05), renal histology improved and there was a reduced expression of renal fibronectin (NS 4.0 ± 0.4, IT 2.3 ± 0.2 and Ctr 1.1 ± 0.1; P < 0.001). Following IT administration, we also observed less expression of renal monocyte chemoattractant protein-1-positive cells per view field (NS 19.0 ± 1, IT 10.1 ± 0.8 and Ctr 2.0 ± 0.3; P < 0.001) as well as reduced systemic and local oxidative stress [serum malondialdehyde (MDA): NS 340 ± 30, IT 224 ± 36 versus baseline 140 ± 5 nmol/mL; P < 0.01]; renal MDA arbitrary units of fluorescence intensity: NS 3.7 ± 0.2, IT 1.8 ± 0.3 and Ctr 0.4 ± 0.2; P < 0.001. CONCLUSIONS Reduction of FcγR1-up-regulated monocytic cells leads to preserved renal function and morphology in a rat model of ischaemia-triggered LIRS. Our results show that targeting activated macrophages is a valuable approach for ameliorating ischaemia-induced tissue injury.
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Affiliation(s)
- Ngwi G Fet
- Department of Surgery, RWTH Aachen, Aachen, Germany
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10
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Gibson AW, Li X, Wu J, Baskin JG, Raman C, Edberg JC, Kimberly RP. Serine phosphorylation of FcγRI cytoplasmic domain directs lipid raft localization and interaction with protein 4.1G. J Leukoc Biol 2011; 91:97-103. [PMID: 22003208 DOI: 10.1189/jlb.0711368] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The high-affinity IgG receptor (CD64, FcγRI) has several special capacities, including the receptor-stimulated cleavage of the cell surface B cell-activating factor of the TNF superfamily (TNFSF13B). With the use of the yeast two-hybrid system, we and others have shown that FcγRI interacts with protein 4.1G (EPB41L2). Our mutational analyses identified two required 4.1G-interacting regions in the FcγRI CY and one FcγRI-interacting site in the C-terminus of protein 4.1G. Herein, we explore mechanism(s) that may regulate the interaction between protein 4.1G and FcγRI CY and influence FcγRI membrane mobility and function. We show that FcγRI CY interacts with protein 4.1G in vitro and that FcγRI coimmunoprecipitates protein 4.1G in freshly isolated human PBMC. With the use of immunostaining, we show that FcγRI colocalizes with protein 4.1G in unstimulated U937 cells, in which the FcγRI CY is constitutively serine-phosphorylated, but significant uncoupling occurs following FcγRI cross-linking, suggesting phosphoserine-regulated interaction. In vitro, protein 4.1G interacted preferentially with CK2-phosphorylated FcγRI CY, and compared with WT FcγRI, a nonphosphorylatable FcγRI mutant receptor was excluded from lipid rafts, suggesting a key role for protein 4.1G in targeting phosphorylated FcγRI to rafts. These data are consistent with a phosphoserine-dependent tethering role for protein 4.1G in maintaining FcγRI in lipid rafts and provide insight into the unique phosphoserine-based regulation of receptor signaling by FcγRI CY.
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Affiliation(s)
- Andrew W Gibson
- Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA.
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van der Poel CE, Spaapen RM, van de Winkel JGJ, Leusen JHW. Functional Characteristics of the High Affinity IgG Receptor, FcγRI. THE JOURNAL OF IMMUNOLOGY 2011; 186:2699-704. [DOI: 10.4049/jimmunol.1003526] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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12
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Huang ZY, Hunter S, Chien P, Kim MK, Han-Kim TH, Indik ZK, Schreiber AD. Interaction of two phagocytic host defense systems: Fcγ receptors and complement receptor 3. J Biol Chem 2011; 286:160-8. [PMID: 21044955 PMCID: PMC3012970 DOI: 10.1074/jbc.m110.163030] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Revised: 10/12/2010] [Indexed: 01/08/2023] Open
Abstract
Phagocytosis of foreign pathogens by cells of the immune system is a vitally important function of innate immunity. The phagocytic response is initiated when ligands on the surface of invading microorganisms come in contact with receptors on the surface of phagocytic cells such as neutrophils, monocytes/macrophages, and dendritic cells. The complement receptor CR3 (CD11b/CD18, Mac-1) mediates the phagocytosis of complement protein (C3bi)-coated particles. Fcγ receptors (FcγRs) bind IgG-opsonized particles and provide a mechanism for immune clearance and phagocytosis of IgG-coated particles. We have observed that stimulation of FcγRs modulates CR3-mediated phagocytosis and that FcγRIIA and FcγRI exert opposite (stimulatory and inhibitory) effects. We have also determined that an intact FcγR immunoreceptor tyrosine-based activation motif is required for these effects, and we have investigated the involvement of downstream effectors. The ability to up-regulate or down-regulate CR3 signaling has important implications for therapeutics in disorders involving the host defense system.
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Affiliation(s)
- Zhen-Yu Huang
- From the Department of Hematology/Oncology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Sharon Hunter
- From the Department of Hematology/Oncology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Paul Chien
- From the Department of Hematology/Oncology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Moo-Kyung Kim
- From the Department of Hematology/Oncology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Tae-Hee Han-Kim
- From the Department of Hematology/Oncology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Zena K. Indik
- From the Department of Hematology/Oncology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Alan D. Schreiber
- From the Department of Hematology/Oncology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
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13
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Mittal R, Sukumaran SK, Selvaraj SK, Wooster DG, Babu MM, Schreiber AD, Verbeek JS, Prasadarao NV. Fcγ receptor I alpha chain (CD64) expression in macrophages is critical for the onset of meningitis by Escherichia coli K1. PLoS Pathog 2010; 6:e1001203. [PMID: 21124939 PMCID: PMC2987830 DOI: 10.1371/journal.ppat.1001203] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Accepted: 10/21/2010] [Indexed: 11/18/2022] Open
Abstract
Neonatal meningitis due to Escherichia coli K1 is a serious illness with unchanged morbidity and mortality rates for the last few decades. The lack of a comprehensive understanding of the mechanisms involved in the development of meningitis contributes to this poor outcome. Here, we demonstrate that depletion of macrophages in newborn mice renders the animals resistant to E. coli K1 induced meningitis. The entry of E. coli K1 into macrophages requires the interaction of outer membrane protein A (OmpA) of E. coli K1 with the alpha chain of Fcγ receptor I (FcγRIa, CD64) for which IgG opsonization is not necessary. Overexpression of full-length but not C-terminal truncated FcγRIa in COS-1 cells permits E. coli K1 to enter the cells. Moreover, OmpA binding to FcγRIa prevents the recruitment of the γ-chain and induces a different pattern of tyrosine phosphorylation of macrophage proteins compared to IgG2a induced phosphorylation. Of note, FcγRIa−/− mice are resistant to E. coli infection due to accelerated clearance of bacteria from circulation, which in turn was the result of increased expression of CR3 on macrophages. Reintroduction of human FcγRIa in mouse FcγRIa−/− macrophages in vitro increased bacterial survival by suppressing the expression of CR3. Adoptive transfer of wild type macrophages into FcγRIa−/− mice restored susceptibility to E. coli infection. Together, these results show that the interaction of FcγRI alpha chain with OmpA plays a key role in the development of neonatal meningitis by E. coli K1. Escherichia coli K1 is the most common cause of meningitis in premature infants; the mortality rate of this disease ranges from 5% to 30%. A better understanding of the pathogenesis of E. coli K1 meningitis is needed to develop new preventative strategies. We have shown that outer membrane protein A (OmpA) of E. coli K1, independent of antibody opsonization, is critical for bacterial entrance and survival within macrophages. Using a newborn mouse model, we found that depletion of macrophages renders the animals resistant to E. coli K1 induced meningitis. OmpA binds to α-chain of Fcγ-receptor I (FcγRIa) in macrophages, but does not induce expected gamma chain association and signaling. FcγRIa knockout mice are resistant to E. coli K1 infection because their macrophages express more CR3 and are thus able to kill bacteria with greater efficiency, preventing the development of high-grade bacteremia, a pre-requisite for the onset of meningitis. These novel observations demonstrate that inhibiting OmpA binding to FcγRIa is a promising therapeutic target for treatment or prevention of neonatal meningitis.
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MESH Headings
- Animals
- Animals, Newborn
- Bacterial Outer Membrane Proteins/metabolism
- Binding, Competitive
- Blotting, Western
- Brain/immunology
- Brain/metabolism
- Brain/microbiology
- COS Cells
- Chlorocebus aethiops
- Escherichia coli/growth & development
- Escherichia coli/pathogenicity
- Flow Cytometry
- Humans
- Immunoglobulin G/immunology
- Immunoglobulin G/metabolism
- Immunoprecipitation
- Macrophage-1 Antigen/metabolism
- Macrophages/immunology
- Macrophages/metabolism
- Macrophages/microbiology
- Meningitis, Escherichia coli/etiology
- Meningitis, Escherichia coli/metabolism
- Meningitis, Escherichia coli/pathology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Nitric Oxide/metabolism
- Phagocytosis
- Phosphorylation
- RNA, Messenger/genetics
- Receptors, IgG/physiology
- Reverse Transcriptase Polymerase Chain Reaction
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Affiliation(s)
- Rahul Mittal
- Division of Infectious Diseases, The Saban Research Institute, Childrens Hospital Los Angeles, Los Angeles, California, United States of America
| | - Sunil K. Sukumaran
- Division of Infectious Diseases, The Saban Research Institute, Childrens Hospital Los Angeles, Los Angeles, California, United States of America
| | - Suresh K. Selvaraj
- Division of Infectious Diseases, The Saban Research Institute, Childrens Hospital Los Angeles, Los Angeles, California, United States of America
| | - David G. Wooster
- Division of Infectious Diseases, The Saban Research Institute, Childrens Hospital Los Angeles, Los Angeles, California, United States of America
| | - M. Madan Babu
- Structural Studies Division, Medical Research Council, Laboratory of Molecular Biology, Cambridge, United Kingdom
| | - Alan D. Schreiber
- Hematology and Oncology Division, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - J. Sjef Verbeek
- Department of Human Genetics, University Medical Center, Leiden, Netherlands
| | - Nemani V. Prasadarao
- Division of Infectious Diseases, The Saban Research Institute, Childrens Hospital Los Angeles, Los Angeles, California, United States of America
- Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America
- * E-mail:
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14
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Genetic characterization and ligand specificity of the ovine Fc gamma receptor I (ovFc gamma RI). Vet Immunol Immunopathol 2010; 137:317-21. [PMID: 20598755 DOI: 10.1016/j.vetimm.2010.06.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2010] [Revised: 04/27/2010] [Accepted: 06/02/2010] [Indexed: 11/20/2022]
Abstract
Receptors for the Fc region of IgG (Fc gamma Rs) play a critical role in the immune system and host protection against infection. In this study, we describe the cloning, mRNA expression and IgG subclass specificity of ovine Fc gamma receptor I (ovFc gamma RI). The ovFc gamma RI cDNA contains a 1047bp open-reading frame, and is predicted to encode a 349 amino acid trans-membrane glycoprotein composed of three immunoglobulin-like domains, a trans-membrane region and a short cytoplasmic tail. The overall identity of the ovine Fc gamma RI to its cattle, human and mouse counterparts at the level of the amino acid sequence was 92%, 61% and 54%, respectively. Rosetting analysis shows that COS-7 cells were transfected with an expressional vector carrying the cDNA open-reading frame of ovFc gamma RI and expressed this receptor on the surface. Identification of ovine Fc gamma RI will aid in the understanding of molecular basis of the ovine immune system and further studies of the receptor function.
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15
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Bakema JE, Bakker A, de Haij S, Honing H, Bracke M, Koenderman L, Vidarsson G, van de Winkel JGJ, Leusen JHW. Inside-Out Regulation of FcαRI (CD89) Depends on PP2A. THE JOURNAL OF IMMUNOLOGY 2008; 181:4080-8. [DOI: 10.4049/jimmunol.181.6.4080] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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Li X, Su K, Ji C, Szalai AJ, Wu J, Zhang Y, Zhou T, Kimberly RP, Edberg JC. Immune opsonins modulate BLyS/BAFF release in a receptor-specific fashion. THE JOURNAL OF IMMUNOLOGY 2008; 181:1012-8. [PMID: 18606652 DOI: 10.4049/jimmunol.181.2.1012] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
TNF ligand superfamily member 13B (B lymphocyte stimulator (BLyS), B cell activating factor (BAFF)) promotes primary B cell proliferation and Ig production. While the soluble form of BLyS/BAFF is thought to be the primary biologically active form, little is known about the regulation of its cleavage and processing. We provide evidence that Fcgamma receptor cross-linking triggers a rapid release of soluble, biologically active BLyS/BAFF from myeloid cells. Surprisingly, this function is primarily mediated by FcgammaRI, but not FcgammaRIIa as defined by specific mAb, and can be initiated by both IgG and C reactive protein as ligands. The generation of a B cell proliferation and survival factor by both innate and adaptive immune opsonins through engagement of an Fcgamma receptor, which can also enhance Ag uptake and presentation, provides a unique opportunity to facilitate Ab production. These results provide a mechanism by which Fcgamma receptors can elevate circulating BLyS levels and promote autoantibody production in immune complex-mediated autoimmune diseases.
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Affiliation(s)
- Xinrui Li
- Department of Medicine, Division of Clinical Immunology and Rheumatology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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17
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Zhang G, Qiao S, Li Q, Wang X, Duan Y, Wang L, Xiao Z, Xia C. Molecular cloning and expression of the porcine high-affinity immunoglobulin G Fc receptor (FcgammaRI). Immunogenetics 2006; 58:845-9. [PMID: 16912901 DOI: 10.1007/s00251-006-0143-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2005] [Accepted: 07/05/2006] [Indexed: 11/28/2022]
Abstract
Receptors for the Fc region (FcgammaRs) of immunoglobulin G (IgG) play a crucial role in the immune system and host protection against infection. In this study, we describe the cloning, sequencing, and expression of the high-affinity IgG receptor from pig. By screening a translated Expressed Sequence Tags database with the human FcgammaRI (CD64) protein sequence, we identified a putative porcine homologue. Subsequent polymerase chain reaction amplification confirmed that the identified full-length cDNA was expressed in porcine cells. Rosetting analysis shows that COS-7 cells transfected with a plasmid containing the cloned cDNA were able to bind chicken erythrocytes sensitized with porcine IgG. Scatchard analysis indicated that monomeric IgG bound to transiently transfected cells with an affinity of approximately 4x10(7) M(-1). The porcine FcgammaRI cDNA is 1,038 nucleotides long and is predicted to encode a 346-amino-acid transmembrane glycoprotein composed of three Ig-like domains, a transmembrane region, and a short cytoplasmic tail. The overall identity of the porcine FcgammaRI to its human and mouse counterparts at the level of the amino acid sequence was 75% and 57%, respectively. Identification of porcine FcgammaRI will aid in the understanding of the molecular basis of the porcine immune system and further studies of the receptor function.
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Affiliation(s)
- Gaiping Zhang
- College of Animal and Veterinary Sciences, Henan Institute of Science and Technology, Xinxiang, China
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18
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Qin H, Edberg JC, Gibson AW, Page GP, Teng L, Kimberly RP. Differential gene expression modulated by the cytoplasmic domain of Fc gamma RIa (CD64) alpha-chain. THE JOURNAL OF IMMUNOLOGY 2004; 173:6211-9. [PMID: 15528358 DOI: 10.4049/jimmunol.173.10.6211] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The cytoplasmic domain (CY) of the ligand-binding alpha-chain of the gamma-chain-associated FcRs can modulate receptor function such as phagocytosis, endocytosis, and intracellular trafficking of receptor-Ag complexes. To assess the potential role of the CY domain of human FcgammaRIa (CD64) alpha-chain in the transcriptional regulation of receptor-induced gene expression, we developed stably transfected murine macrophage cell lines expressing a full-length or a CY deletion mutant (tail-less) of human FcgammaRIa to analyze gene expression in response to receptor-specific cross-linking. Using the Affymetrix murine genome U74Av2 GeneChip array, we observed >100 candidate genes having > or =2-fold difference expression at 1.5 and 3 h after stimulation. Focusing on several immunologically related genes, we confirmed differential expression of M-CSF, macrophage inhibitory cytokine-1, leukocyte-specific protein 1, MIP-2, and IL-1R antagonist by RT-PCR and RNase protection assays. Analysis of mRNA stability indicated that the differential regulation of gene expression by the CY of the CD64 alpha-chain is at the level of gene transcription. Our results indicate that the CY of the CD64 alpha-chain modulates transcriptional activity induced by receptor-specific engagement in macrophages and provides a framework for understanding distinct expression profiles elicited by different Fc gamma-chain-associated receptors.
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Affiliation(s)
- Hongwei Qin
- Department of Medicine, University of Alabama at Birmingham, 1900 University Boulevard, Birmingham, AL 35294-0006, USA
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19
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Beekman JM, Bakema JE, van der Linden J, Tops B, Hinten M, van Vugt M, van de Winkel JGJ, Leusen JHW. Modulation of FcγRI (CD64) Ligand Binding by Blocking Peptides of Periplakin. J Biol Chem 2004; 279:33875-81. [PMID: 15161926 DOI: 10.1074/jbc.m401018200] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
FcgammaRI requires both the intracellular domain of the alpha-chain and associated leukocyte Fc receptor (FcR) gamma-chains for its biological function. We recently found the C terminus of periplakin to selectively interact with the cytoplasmic domain of the FcgammaRI alpha-chain. It thereby enhances the capacity of FcgammaRI to bind, internalize, and present antigens on MHC class II. Here, we characterized the domains involved in FcgammaRI-periplakin interaction using truncated and alanine-substituted FcgammaRI mutants and randomly mutagenized periplakin. This allowed us to design TAT peptides that selectively interfered with endogenous FcgammaRI-periplakin interactions. The addition of these peptides to FcgammaRI-expressing cells modulated FcgammaRI ligand binding, as assessed by erythrocyte-antibody-rosetting. These data support a dominant-negative role of C-terminal periplakin for FcgammaRI biological activity and implicate periplakin as a novel regulator of FcgammaRI in immune cells.
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Affiliation(s)
- Jeffrey M Beekman
- Immunotherapy Laboratory, Department of Immunology, University Medical Center Utrecht, Lundlaan 6, 3584 EA, The Netherlands
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20
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Beekman JM, Bakema JE, van de Winkel JGJ, Leusen JHW. Direct interaction between FcgammaRI (CD64) and periplakin controls receptor endocytosis and ligand binding capacity. Proc Natl Acad Sci U S A 2004; 101:10392-7. [PMID: 15229321 PMCID: PMC478582 DOI: 10.1073/pnas.0401217101] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2004] [Indexed: 11/18/2022] Open
Abstract
FcgammaRI depends for its biological function on both the intracellular domain of the alpha-chain and associated Fc receptor (FcR) gamma-chains. However, functional protein effectors of FcgammaRI's intracellular domain have not been identified. In this study, we identified periplakin (PPL) as a selective interacting protein for the intracellular tail of FcgammaRI but no other activatory FcRs. The interaction was confirmed by coimmunoprecipitation and blot-overlay assays. PPL and FcgammaRI colocalized at the plasma membrane in monocytes and cell transfectants, and both were up-regulated by IFN-gamma. By expressing C-terminal PPL in transfectants, we established a pivotal role for this protein in FcgammaRI ligand binding, endocytosis, and antigen presentation. These data illustrate that intracellular protein interactions with a multisubunit FcR alpha-chain can confer unique properties to the receptor.
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Affiliation(s)
- Jeffrey M Beekman
- Immunotherapy Laboratory, Department of Immunology, University Medical Center Utrecht, 3584 EA, Utrecht, The Netherlands
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