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Sharma N, Ponce M, Kaul S, Pan Z, Berry DM, Eiwegger T, McGlade CJ. SLAP Is a Negative Regulator of FcεRI Receptor-Mediated Signaling and Allergic Response. Front Immunol 2019; 10:1020. [PMID: 31156621 PMCID: PMC6529641 DOI: 10.3389/fimmu.2019.01020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 04/23/2019] [Indexed: 01/09/2023] Open
Abstract
Binding of antigen to IgE-high affinity FcεRI complexes on mast cells and basophils results in the release of preformed mediators such as histamine and de novo synthesis of cytokines causing allergic reactions. Src-like adapter protein (SLAP) functions co-operatively with c-Cbl to negatively regulate signaling downstream of the T cell receptor, B cell receptor, and receptor tyrosine kinases (RTK). Here, we investigated the role of SLAP in FcεRI-mediated mast cell signaling, using bone marrow derived mast cells (BMMCs) from SLAP knock out (SLAP KO) mice. Mature SLAP-KO BMMCs displayed significantly enhanced antigen induced degranulation and synthesis of IL-6, TNFα, and MCP-1 compared to wild type (WT) BMMCs. In addition, SLAP KO mice displayed an enhanced passive cutaneous anaphylaxis response. In agreement with a negative regulatory role, SLAP KO BMMCs showed enhanced FcεRI-mediated signaling to downstream effector kinases, Syk, Erk, and Akt. Recombinant GST-SLAP protein binds to the FcεRIβ chain and to the Cbl-b in mast cell lysates, suggesting a role in FcεRI down regulation. In addition, the ubiquitination of FcεRIγ chain and antigen mediated down regulation of FcεRI is impaired in SLAP KO BMMCs compared to the wild type. In line with these findings, stimulation of peripheral blood human basophils with FcεRIα antibody, or a clinically relevant allergen, resulted in increased SLAP expression. Together, these results indicate that SLAP is a dynamic regulator of IgE-FcεRI signaling, limiting allergic responses.
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Affiliation(s)
- Namit Sharma
- Program in Cell Biology and the Arthur and Sonia Labatt Brain Tumour Research Centre, The Hospital for Sick Children, Toronto, ON, Canada
| | - Marta Ponce
- Program in Translational Medicine, The Hospital for Sick Children, Toronto, ON, Canada.,Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria.,Department of Immunology, University of Toronto, Toronto, ON, Canada
| | - Savar Kaul
- Program in Cell Biology and the Arthur and Sonia Labatt Brain Tumour Research Centre, The Hospital for Sick Children, Toronto, ON, Canada
| | - Zhongda Pan
- Program in Cell Biology and the Arthur and Sonia Labatt Brain Tumour Research Centre, The Hospital for Sick Children, Toronto, ON, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada
| | - Donna M Berry
- Program in Cell Biology and the Arthur and Sonia Labatt Brain Tumour Research Centre, The Hospital for Sick Children, Toronto, ON, Canada
| | - Thomas Eiwegger
- Program in Translational Medicine, The Hospital for Sick Children, Toronto, ON, Canada.,Department of Immunology, University of Toronto, Toronto, ON, Canada.,Food allergy and Anaphylaxis Program, Division of Immunology and Allergy, Department of Paediatrics, The Hospital for Sick Children, Toronto, ON, Canada
| | - Catherine J McGlade
- Program in Cell Biology and the Arthur and Sonia Labatt Brain Tumour Research Centre, The Hospital for Sick Children, Toronto, ON, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada
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Silwal P, Shin K, Choi S, Namgung U, Lee CY, Heo JY, Lim K, Park JIL, Kim KH, Park SK. Tryptophan Negatively Regulates IgE-mediated Mast Cell Activation. ACTA ACUST UNITED AC 2017. [DOI: 10.11637/kjpa.2017.30.2.53] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Prashanta Silwal
- Department of Medical Science, Chungnam National University, Korea
| | - Keuna Shin
- Department of Medical Science, Chungnam National University, Korea
| | - Seulgi Choi
- Department of Medical Science, Chungnam National University, Korea
| | - Uk Namgung
- Department of Oriental Medicine, Daejeon University, Korea
| | - Chan Yong Lee
- Department of Life Science, Daejeon University, Korea
| | - Jun-Young Heo
- Department of Medical Science, Chungnam National University, Korea
| | - Kyu Lim
- Department of Medical Science, Chungnam National University, Korea
| | - Jong IL Park
- Department of Medical Science, Chungnam National University, Korea
| | - Ki-Hwan Kim
- Department of Radiation Oncology, Chungnam National University Hospital, Korea
| | - Seung-Kiel Park
- Department of Medical Science, Chungnam National University, Korea
- Department of Biochemistry, College of Medicine, Chungnam National University, Korea
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The Emerging and Diverse Roles of Src-Like Adaptor Proteins in Health and Disease. Mediators Inflamm 2015; 2015:952536. [PMID: 26339145 PMCID: PMC4539169 DOI: 10.1155/2015/952536] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Revised: 01/02/2015] [Accepted: 01/05/2015] [Indexed: 12/26/2022] Open
Abstract
Although Src-like adaptor proteins (SLAP-1 and SLAP-2) were mainly studied in lymphocytes, where they act as negative regulators and provide fine control of receptor signaling, recently, several other functions of these proteins were discovered. In addition to the well-characterized immunoregulatory functions, SLAP proteins appear to have an essential role in the pathogenesis of type I hypersensitivity, osteoporosis, and numerous malignant diseases. Both adaptor proteins are expressed in a wide variety of tissues, where they have mostly inhibitory effects on multiple intracellular signaling pathways. In this review, we summarize the diverse effects of SLAP proteins.
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Kazi JU, Kabir NN, Rönnstrand L. Role of SRC-like adaptor protein (SLAP) in immune and malignant cell signaling. Cell Mol Life Sci 2015; 72:2535-44. [PMID: 25772501 PMCID: PMC11113356 DOI: 10.1007/s00018-015-1882-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 03/01/2015] [Accepted: 03/05/2015] [Indexed: 01/05/2023]
Abstract
SRC-like adaptor protein (SLAP) is an adaptor protein structurally similar to the SRC family protein kinases. Like SRC, SLAP contains an SH3 domain followed by an SH2 domain but the kinase domain has been replaced by a unique C-terminal region. SLAP is expressed in a variety of cell types. Current studies suggest that it regulates signaling of various cell surface receptors including the B cell receptor, the T cell receptor, cytokine receptors and receptor tyrosine kinases which are important regulator of immune and cancer cell signaling. SLAP targets receptors, or its associated components, by recruiting the ubiquitin machinery and thereby destabilizing signaling. SLAP directs receptors to ubiquitination-mediated degradation and controls receptors turnover as well as signaling. Thus, SLAP appears to be an important component in regulating signal transduction required for immune and malignant cells.
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Affiliation(s)
- Julhash U. Kazi
- Division of Translational Cancer Research, Lund University, Medicon Village 404:C3, 223 63 Lund, Sweden
- Lund Stem Cell Center, Lund University, Lund, Sweden
- Laboratory of Computational Biochemistry, KN Biomedical Research Institute, Barisal, Bangladesh
| | - Nuzhat N. Kabir
- Laboratory of Computational Biochemistry, KN Biomedical Research Institute, Barisal, Bangladesh
| | - Lars Rönnstrand
- Division of Translational Cancer Research, Lund University, Medicon Village 404:C3, 223 63 Lund, Sweden
- Lund Stem Cell Center, Lund University, Lund, Sweden
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Adenine suppresses IgE-mediated mast cell activation. Mol Immunol 2015; 65:242-9. [PMID: 25700347 DOI: 10.1016/j.molimm.2015.01.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 01/19/2015] [Accepted: 01/19/2015] [Indexed: 01/13/2023]
Abstract
Nucleobase adenine is produced by dividing human lymphoblasts mainly from polyamine synthesis and inhibits immunological functions of lymphocytes. We investigated the anti-allergic effect of adenine on IgE-mediated mast cell activation in vitro and passive cutaneous anaphylaxis (PCA) in mice. Intraperitoneal injection of adenine to IgE-sensitized mice attenuated IgE-mediated PCA reaction in a dose dependent manner, resulting in a median effective concentration of 4.21 mg/kg. In mast cell cultures, only adenine among cytosine, adenine, adenosine, ADP and ATP dose-dependently suppressed FcɛRI (a high affinity receptor for IgE)-mediated degranulation with a median inhibitory concentration of 1.6mM. It also blocked the production of LTB4, an inflammatory lipid mediator, and inflammatory cytokines TNF-α and IL-4. In addition, adenine blocked thapsigargin-induced degranulation which is FcɛRI-independent but shares FcɛRI-dependent signaling events. Adenine inhibited the phosphorylation of signaling molecules important to FcɛRI-mediated allergic reactions such as Syk, PLCγ2, Gab2, Akt, and mitogen activated protein kinases ERK and JNK. From this result, we report for the first time that adenine inhibits PCA in mice and allergic reaction by inhibiting FcɛRI-mediated signaling events in mast cells. Therefore, adenine may be useful for the treatment of mast cell-mediated allergic diseases. Also, the upregulation of adenine production may provide another mechanism for suppressing mast cell activity especially at inflammatory sites.
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Ayroldi E, Cannarile L, Migliorati G, Nocentini G, Delfino DV, Riccardi C. Mechanisms of the anti-inflammatory effects of glucocorticoids: genomic and nongenomic interference with MAPK signaling pathways. FASEB J 2012; 26:4805-20. [PMID: 22954589 DOI: 10.1096/fj.12-216382] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Glucocorticoids (GCs) are steroid hormones produced by the adrenal gland and regulated by the hypothalamus-pituitary-adrenal axis. GCs mediate effects that mostly result in transcriptional regulation of glucocorticoid receptor target genes. Mitogen-activated protein kinases (MAPKs) comprise a family of signaling proteins that convert extracellular stimuli into the activation of intracellular transduction pathways via phosphorylation of a cascade of substrates. They modulate a variety of physiological cell processes, such as proliferation, apoptosis, and development. However, when MAPKs are improperly activated by proinflammatory and/or extracellular stress stimuli, they contribute to the regulation of proinflammatory transcription factors, thus perpetuating activation of the inflammatory cascade. One of the mechanisms by which GCs exert their anti-inflammatory effects is negative interference with MAPK signaling pathways. Several functional interactions between GCs and MAPK signaling have been discovered and studied. Some of these interactions involve the GC-mediated up-regulation of proteins that in turn interfere with the activation of MAPK, such as glucocorticoid-induced-leucine zipper, MAPK phosphatase-1, and annexin-1. Other mechanisms include activated GR directly interacting with components of the MAPK pathway and negatively regulating their activation. The multiple interactions between GCs and MAPK pathways and their potential biological relevance in mediating the anti-inflammatory effects of GCs are reviewed.
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Affiliation(s)
- Emira Ayroldi
- Section of Pharmacology, Department of Clinical and Experimental Medicine, University of Perugia, Via del Giochetto, 06122 Perugia, Italy.
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Infection of mast cells with live streptococci causes a toll-like receptor 2- and cell-cell contact-dependent cytokine and chemokine response. Infect Immun 2009; 78:854-64. [PMID: 19933827 DOI: 10.1128/iai.01004-09] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Mast cells (MCs) are strongly implicated in immunity toward bacterial infection, but the molecular mechanisms by which MCs contribute to the host response are only partially understood. We addressed this issue by examining the direct effects of a Gram-positive pathogen, Streptococcus equi, on bone marrow-derived MCs (BMMCs). Ultrastructural analysis revealed extensive formation of dilated rough endoplasmic reticulum in response to bacterial infection, indicating strong induction of protein synthesis. However, the BMMCs did not show signs of extensive degranulation, and this was supported by only slow release of histamine in response to infection. Coculture of live bacteria with BMMCs caused a profound secretion of CCL2/MCP-1, CCL7/MCP-3, CXCL2/MIP-2, CCL5/RANTES, interleukin-4 (IL-4), IL-6, IL-12, IL-13, and tumor necrosis factor alpha, as shown by antibody-based cytokine/chemokine arrays and/or enzyme-linked immunosorbent assay. In contrast, heat-inactivated bacteria caused only minimal cytokine/chemokine release. The cytokine/chemokine responses were substantially attenuated in Toll-like receptor 2-deficient BMMCs and were strongly dependent on cell-cell contacts between bacteria and BMMCs. Gene chip microarray analysis confirmed a massively upregulated expression of the genes coding for the secreted cytokines and chemokines and also identified a pronounced upregulation of numerous additional genes, including transcription factors, signaling molecules, and proteases. Together, the present study outlines MC-dependent molecular events associated with Gram-positive infection and thus provides an advancement in our understanding of how MCs may contribute to host defense toward bacterial insults.
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