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Shi H, Song J, Gao L, Shan X, Panicker SR, Yao L, McDaniel M, Zhou M, McGee S, Zhong H, Griffin CT, Xia L, Shao B. Deletion of Talin1 in Myeloid Cells Facilitates Atherosclerosis in Mice. Arterioscler Thromb Vasc Biol 2024; 44:1799-1812. [PMID: 38899470 DOI: 10.1161/atvbaha.123.319677] [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: 06/01/2023] [Accepted: 04/23/2024] [Indexed: 06/21/2024]
Abstract
BACKGROUND Integrin-regulated monocyte recruitment and cellular responses of monocyte-derived macrophages are critical for the pathogenesis of atherosclerosis. In the canonical model, talin1 controls ligand binding to integrins, a prerequisite for integrins to mediate leukocyte recruitment and induce immune responses. However, the role of talin1 in the development of atherosclerosis has not been studied. Our study investigated how talin1 in myeloid cells regulates the progression of atherosclerosis. METHODS On an Apoe-/- background, myeloid talin1-deficient mice and the control mice were fed with a high-fat diet for 8 or 12 weeks to induce atherosclerosis. The atherosclerosis development in the aorta and monocyte recruitment into atherosclerotic lesions were analyzed. RESULTS Myeloid talin1 deletion facilitated the formation of atherosclerotic lesions and macrophage deposition in lesions. Talin1 deletion abolished integrin β2-mediated adhesion of monocytes but did not impair integrin α4β1-dependent cell adhesion in a flow adhesion assay. Strikingly, talin1 deletion did not prevent Mn2+- or chemokine-induced activation of integrin α4β1 to the high-affinity state for ligands. In an in vivo competitive homing assay, monocyte infiltration into inflamed tissues was prohibited by antibodies to integrin α4β1 but was not affected by talin1 deletion or antibodies to integrin β2. Furthermore, quantitative polymerase chain reaction and ELISA (enzyme-linked immunosorbent assay) analysis showed that macrophages produced cytokines to promote inflammation and the proliferation of smooth muscle cells. Ligand binding to integrin β3 inhibited cytokine generation in macrophages, although talin1 deletion abolished the negative effects of integrin β3. CONCLUSIONS Integrin α4β1 controls monocyte recruitment during atherosclerosis. Talin1 is dispensable for integrin α4β1 activation to the high-affinity state and integrin α4β1-mediated monocyte recruitment. Yet, talin1 is required for integrin β3 to inhibit the production of inflammatory cytokines in macrophages. Thus, intact monocyte recruitment and elevated inflammatory responses cause enhanced atherosclerosis in talin1-deficient mice. Our study provides novel insights into the roles of myeloid talin1 and integrins in the progression of atherosclerosis.
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Affiliation(s)
- Huiping Shi
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center (H.S., L.X.)
| | - Jianhua Song
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
| | - Liang Gao
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
| | - Xindi Shan
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
| | - Sumith R Panicker
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
| | - Longbiao Yao
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
| | - Michael McDaniel
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
| | - Meixiang Zhou
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
| | - Samuel McGee
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
| | - Hui Zhong
- Lindsley F. Kimball Research Institute, New York Blood Center (H.Z., B.S.)
| | - Courtney T Griffin
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
| | - Lijun Xia
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center (H.S., L.X.)
| | - Bojing Shao
- Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation (H.S., J.S., L.G., X.S., S.R.P., L.Y., M.M., M.Z., S.M., C.T.G., L.X., B.S.)
- Lindsley F. Kimball Research Institute, New York Blood Center (H.Z., B.S.)
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Kendirli A, de la Rosa C, Lämmle KF, Eglseer K, Bauer IJ, Kavaka V, Winklmeier S, Zhuo L, Wichmann C, Gerdes LA, Kümpfel T, Dornmair K, Beltrán E, Kerschensteiner M, Kawakami N. A genome-wide in vivo CRISPR screen identifies essential regulators of T cell migration to the CNS in a multiple sclerosis model. Nat Neurosci 2023; 26:1713-1725. [PMID: 37709997 PMCID: PMC10545543 DOI: 10.1038/s41593-023-01432-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Accepted: 08/14/2023] [Indexed: 09/16/2023]
Abstract
Multiple sclerosis (MS) involves the infiltration of autoreactive T cells into the CNS, yet we lack a comprehensive understanding of the signaling pathways that regulate this process. Here, we conducted a genome-wide in vivo CRISPR screen in a rat MS model and identified 5 essential brakes and 18 essential facilitators of T cell migration to the CNS. While the transcription factor ETS1 limits entry to the CNS by controlling T cell responsiveness, three functional modules, centered around the adhesion molecule α4-integrin, the chemokine receptor CXCR3 and the GRK2 kinase, are required for CNS migration of autoreactive CD4+ T cells. Single-cell analysis of T cells from individuals with MS confirmed that the expression of these essential regulators correlates with the propensity of CD4+ T cells to reach the CNS. Our data thus reveal key regulators of the fundamental step in the induction of MS lesions.
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Affiliation(s)
- Arek Kendirli
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
| | - Clara de la Rosa
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
- Graduate School of Systemic Neurosciences, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Katrin F Lämmle
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
| | - Klara Eglseer
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
| | - Isabel J Bauer
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
| | - Vladyslav Kavaka
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
| | - Stephan Winklmeier
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
| | - La Zhuo
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
| | - Christian Wichmann
- Division of Transfusion Medicine, Cell Therapeutics and Haemostaseology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
| | - Lisa Ann Gerdes
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
- Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Tania Kümpfel
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
| | - Klaus Dornmair
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
| | - Eduardo Beltrán
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany
- Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Martin Kerschensteiner
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany.
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany.
- Munich Cluster for Systems Neurology (SyNergy), Munich, Germany.
| | - Naoto Kawakami
- Institute of Clinical Neuroimmunology, University Hospital, Ludwig-Maximilians-Universität München, Munich, Germany.
- Biomedical Center (BMC), Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried, Germany.
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Gangopadhyay K, Roy S, Sen Gupta S, Chandradasan A, Chowdhury S, Das R. Regulating the discriminatory response to antigen by T-cell receptor. Biosci Rep 2022; 42:BSR20212012. [PMID: 35260878 PMCID: PMC8965820 DOI: 10.1042/bsr20212012] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 03/04/2022] [Accepted: 03/08/2022] [Indexed: 11/17/2022] Open
Abstract
The cell-mediated immune response constitutes a robust host defense mechanism to eliminate pathogens and oncogenic cells. T cells play a central role in such a defense mechanism and creating memories to prevent any potential infection. T cell recognizes foreign antigen by its surface receptors when presented through antigen-presenting cells (APCs) and calibrates its cellular response by a network of intracellular signaling events. Activation of T-cell receptor (TCR) leads to changes in gene expression and metabolic networks regulating cell development, proliferation, and migration. TCR does not possess any catalytic activity, and the signaling initiates with the colocalization of several enzymes and scaffold proteins. Deregulation of T cell signaling is often linked to autoimmune disorders like severe combined immunodeficiency (SCID), rheumatoid arthritis, and multiple sclerosis. The TCR remarkably distinguishes the minor difference between self and non-self antigen through a kinetic proofreading mechanism. The output of TCR signaling is determined by the half-life of the receptor antigen complex and the time taken to recruit and activate the downstream enzymes. A longer half-life of a non-self antigen receptor complex could initiate downstream signaling by activating associated enzymes. Whereas, the short-lived, self-peptide receptor complex disassembles before the downstream enzymes are activated. Activation of TCR rewires the cellular metabolic response to aerobic glycolysis from oxidative phosphorylation. How does the early event in the TCR signaling cross-talk with the cellular metabolism is an open question. In this review, we have discussed the recent developments in understanding the regulation of TCR signaling, and then we reviewed the emerging role of metabolism in regulating T cell function.
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Affiliation(s)
- Kaustav Gangopadhyay
- Department of Biological Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur campus, Mohanpur 741246, India
| | - Swarnendu Roy
- Department of Biological Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur campus, Mohanpur 741246, India
| | - Soumee Sen Gupta
- Department of Biological Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur campus, Mohanpur 741246, India
| | - Athira C. Chandradasan
- Department of Biological Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur campus, Mohanpur 741246, India
| | - Subhankar Chowdhury
- Department of Biological Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur campus, Mohanpur 741246, India
| | - Rahul Das
- Department of Biological Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur campus, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research Kolkata, Mohanpur campus, Mohanpur 741246, India
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4
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Laufer JM, Kindinger I, Artinger M, Pauli A, Legler DF. CCR7 Is Recruited to the Immunological Synapse, Acts as Co-stimulatory Molecule and Drives LFA-1 Clustering for Efficient T Cell Adhesion Through ZAP70. Front Immunol 2019; 9:3115. [PMID: 30692994 PMCID: PMC6339918 DOI: 10.3389/fimmu.2018.03115] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 12/17/2018] [Indexed: 12/26/2022] Open
Abstract
The chemokine receptor CCR7 guides T cells and dendritic cells to and within lymph nodes to launch the onset of adaptive immunity. Here, we demonstrate that CCR7 in addition acts as a potent co-stimulatory molecule in T cell activation. We found that antigen recognition and engagement of the TCR results in CCR7 accumulation at the immunological synapse where CCR7 and the TCR co-localize within sub-synaptic vesicles. We demonstrate that CCR7 triggering alone is sufficient to recruit and activate ZAP70, a critical kinase for T cell activation, through Src kinase, whereas TCR CCR7 co-stimulation results in increased and prolonged ZAP70 kinase activity. Finally, we show that ZAP70, acting as adapter molecule, is critical for CCR7-mediated inside-out signaling to integrins, thereby modulating LFA-1 valency regulation to promote cell adhesion, a key step in immunological synapse formation and efficient T cell activation.
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Affiliation(s)
- Julia M Laufer
- Biotechnology Institute Thurgau (BITg) at the University of Konstanz, Kreuzlingen, Switzerland.,Konstanz Research School Chemical Biology, Department of Biology, University of Konstanz, Konstanz, Germany
| | - Ilona Kindinger
- Biotechnology Institute Thurgau (BITg) at the University of Konstanz, Kreuzlingen, Switzerland
| | - Marc Artinger
- Biotechnology Institute Thurgau (BITg) at the University of Konstanz, Kreuzlingen, Switzerland.,Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
| | | | - Daniel F Legler
- Biotechnology Institute Thurgau (BITg) at the University of Konstanz, Kreuzlingen, Switzerland.,Konstanz Research School Chemical Biology, Department of Biology, University of Konstanz, Konstanz, Germany
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5
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Laufer JM, Legler DF. Beyond migration-Chemokines in lymphocyte priming, differentiation, and modulating effector functions. J Leukoc Biol 2018; 104:301-312. [PMID: 29668063 DOI: 10.1002/jlb.2mr1217-494r] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 03/08/2018] [Accepted: 03/12/2018] [Indexed: 02/06/2023] Open
Abstract
Chemokines and their receptors coordinate the positioning of leukocytes, and lymphocytes in particular, in space and time. Discrete lymphocyte subsets, depending on their activation and differentiation status, express various sets of chemokine receptors to be recruited to distinct tissues. Thus, the network of chemokines and their receptors ensures the correct localization of specialized lymphocyte subsets within the appropriate microenvironment enabling them to search for cognate antigens, to become activated, and to fulfill their effector functions. The chemokine system therefore is vital for the initiation as well as the regulation of immune responses to protect the body from pathogens while maintaining tolerance towards self. Besides the well investigated function of orchestrating directed cell migration, chemokines additionally act on lymphocytes in multiple ways to shape immune responses. In this review, we highlight and discuss the role of chemokines and chemokine receptors in controlling cell-to-cell contacts required for lymphocyte arrest on endothelial cells and immunological synapse formation, in lymphocyte priming and differentiation, survival, as well as in modulating effector functions.
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Affiliation(s)
- Julia M Laufer
- Biotechnology Institute Thurgau (BITg), University of Konstanz, Kreuzlingen, Switzerland.,Konstanz Research School Chemical Biology, University of Konstanz, Konstanz, Germany
| | - Daniel F Legler
- Biotechnology Institute Thurgau (BITg), University of Konstanz, Kreuzlingen, Switzerland.,Konstanz Research School Chemical Biology, University of Konstanz, Konstanz, Germany
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6
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Teixidó J, Martínez-Moreno M, Díaz-Martínez M, Sevilla-Movilla S. The good and bad faces of the CXCR4 chemokine receptor. Int J Biochem Cell Biol 2017; 95:121-131. [PMID: 29288743 DOI: 10.1016/j.biocel.2017.12.018] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 12/14/2017] [Accepted: 12/19/2017] [Indexed: 11/18/2022]
Abstract
Chemokines are chemotactic cytokines that promote cell migration and activation under homeostatic and inflammatory conditions. Chemokines bind to seven transmembrane-spanning receptors that are coupled to heterotrimeric guanine nucleotide-binding (G) proteins, which are the responsible for intracellularly transmitting the activating signals for cell migration. Hematopoiesis, vascular development, lymphoid organ morphogenesis, cardiogenesis and neural differentiation are amongst the processes involving chemokine function. In addition, immune cell trafficking from bone marrow to blood circulation, and from blood and lymph to lymphoid and inflamed tissues, is tightly regulated by chemokines both under physiological conditions and also in autoimmune diseases. Furthermore, chemokine binding to their receptors stimulate trafficking to and positioning of cancer cells into target tissues and organs during tumour dissemination. The CXCL12 chemokine (also known as stromal-cell derived factor-1α, SDF-1α) plays key roles in hematopoiesis and lymphoid tissue architecture, in cardiogenesis, vascular formation and neurogenesis, as well as in the trafficking of solid and hematological cancer cell types. CXCL12 binds to the CXCR4 receptor, a multi-facetted molecule which tightly mirrors CXCL12 functions in homeostasis and disease. This review addresses the important roles of the CXCR4-CXCL12 axis in homeostasis, specially focusing in hematopoiesis, as well as it provides a picture of CXCR4 as mediator of cancer cell spreading, and a view of the available CXCR4 antagonists in different cancer types.
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Affiliation(s)
- Joaquin Teixidó
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), 28040 Madrid, Spain.
| | - Mónica Martínez-Moreno
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), 28040 Madrid, Spain
| | - Marta Díaz-Martínez
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), 28040 Madrid, Spain
| | - Silvia Sevilla-Movilla
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), 28040 Madrid, Spain
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7
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Kuropka B, Schraven B, Kliche S, Krause E, Freund C. Tyrosine-phosphorylation of the scaffold protein ADAP and its role in T cell signaling. Expert Rev Proteomics 2017; 13:545-54. [PMID: 27258783 DOI: 10.1080/14789450.2016.1187565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
INTRODUCTION The Adhesion and Degranulation promoting Adaptor Protein (ADAP) is phosphorylated upon T cell activation and acts as a scaffold for the formation of a signaling complex that integrates molecular interactions between T cell or chemokine receptors, the actin cytoskeleton, and integrin-mediated cellular adhesion and migration. AREAS COVERED This article reviews current knowledge of the functions of the adapter protein ADAP in T cell signaling with a focus on the role of individual phosphotyrosine (pY) motifs for SH2 domain mediated interactions. The data presented was obtained from literature searches (PubMed) as well as the authors own research on the topic. Expert commentary: ADAP can be regarded as a paradigmatic example of how tyrosine phosphorylation sites serve as dynamic interaction hubs. Molecular crowding at unstructured and redundant sites (pY595, pY651) is contrasted by more specific interactions enabled by the three-dimensional environment of a particular phosphotyrosine motif (pY571).
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Affiliation(s)
- Benno Kuropka
- a Freie Universität Berlin, Institut für Chemie und Biochemie, Protein Biochemistry Group , Berlin , Germany.,b Mass Spectrometry Group, Leibniz-Institut für Molekulare Pharmakologie , Berlin , Germany
| | - Burkhart Schraven
- c Institute of Molecular and Clinical Immunology , Otto-von-Guericke-University , Magdeburg , Germany.,d Department of Immune Control , Helmholtz Center for Infection Research (HZI) , Braunschweig , Germany
| | - Stefanie Kliche
- c Institute of Molecular and Clinical Immunology , Otto-von-Guericke-University , Magdeburg , Germany
| | - Eberhard Krause
- b Mass Spectrometry Group, Leibniz-Institut für Molekulare Pharmakologie , Berlin , Germany
| | - Christian Freund
- a Freie Universität Berlin, Institut für Chemie und Biochemie, Protein Biochemistry Group , Berlin , Germany
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8
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Wu CY, Tsai YY, Chen SY, Lin YP, Shin JW, Wu CC, Yang BC. Interaction of Zap70 and CXCR4 receptor at lamellipodia that determines the directionality during Jurkat T cells chemotaxis. Mol Immunol 2017; 90:245-254. [DOI: 10.1016/j.molimm.2017.08.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 07/21/2017] [Accepted: 08/13/2017] [Indexed: 10/19/2022]
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9
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Vadillo E, Dorantes-Acosta E, Pelayo R, Schnoor M. T cell acute lymphoblastic leukemia (T-ALL): New insights into the cellular origins and infiltration mechanisms common and unique among hematologic malignancies. Blood Rev 2017; 32:36-51. [PMID: 28830639 DOI: 10.1016/j.blre.2017.08.006] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 08/08/2017] [Accepted: 08/12/2017] [Indexed: 02/06/2023]
Abstract
T-cell acute lymphoblastic leukemia (T-ALL) accounts for 15% and 25% of total childhood and adult ALL cases, respectively. During T-ALL, patients are at risk of organ infiltration by leukemic T-cells. Infiltration is a major consequence of disease relapse and correlates with poor prognosis. Transendothelial migration of leukemic cells is required to exit the blood stream into target organs. While mechanisms of normal T-cell transmigration are well known, the mechanisms of leukemic T-cell extravasation remain elusive; but involvement of chemokines, integrins and Notch signaling play critical roles. Here, we summarize current knowledge about molecular mechanisms of leukemic T-cell infiltration with special emphasis on the newly identified subtype early T-cell-progenitor (ETP)-ALL. Furthermore, we compare the extravasation potential of T-ALL cells with that of other hematologic malignancies such as B-ALL and acute myeloid leukemia (AML).
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Affiliation(s)
- Eduardo Vadillo
- Department for Molecular Biomedicine, Centre for Investigation and Advanced Studies of the National Polytechnic Institute (Cinvestav-IPN), 07360 Mexico City, Mexico.
| | - Elisa Dorantes-Acosta
- Leukemia Clinic, Children's Hospital of Mexico Federico Gómez, 06720 Mexico City, Mexico
| | - Rosana Pelayo
- Oncology Research Unit, National Medical Center, Mexican Institute for Social Security, 06720 Mexico City, Mexico
| | - Michael Schnoor
- Department for Molecular Biomedicine, Centre for Investigation and Advanced Studies of the National Polytechnic Institute (Cinvestav-IPN), 07360 Mexico City, Mexico.
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10
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Sosa-Costa A, Isern de Val S, Sevilla-Movilla S, Borgman KJE, Manzo C, Teixidó J, Garcia-Parajo MF. Lateral Mobility and Nanoscale Spatial Arrangement of Chemokine-activated α4β1 Integrins on T Cells. J Biol Chem 2016; 291:21053-21062. [PMID: 27481944 PMCID: PMC5076515 DOI: 10.1074/jbc.m116.733709] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Indexed: 01/13/2023] Open
Abstract
Chemokine stimulation of integrin α4β1-dependent T lymphocyte adhesion is a key step during lymphocyte trafficking. A central question regarding α4β1 function is how its lateral mobility and organization influence its affinity and avidity following cell stimulation with chemokines and/or ligands. Using single particle tracking and superresolution imaging approaches, we explored the lateral mobility and spatial arrangement of individual α4β1integrins on T cells exposed to different activating stimuli. We show that CXCL12 stimulation leads to rapid and transient α4β1activation, measured by induction of the activation epitope recognized by the HUTS-21 anti-β1antibody and by increased talin-β1 association. CXCL12-dependent α4β1 activation directly correlated with restricted lateral diffusion and integrin immobilization. Moreover, co-stimulation by CXCL12 together with soluble VCAM-1 potentiated integrin immobilization with a 5-fold increase in immobile integrins compared with unstimulated conditions. Our data indicate that docking by talin of the chemokine-activated α4β1 to the actin cytoskeleton favors integrin immobilization, which likely facilitates ligand interaction and increased adhesiveness. Superresolution imaging showed that the nanoscale organization of high-affinity α4β1 remains unaffected following chemokine and/or ligand addition. Instead, newly activated α4β1 integrins organize on the cell membrane as independent units without joining pre-established integrin sites to contribute to cluster formation. Altogether, our results provide a rationale to understand how the spatiotemporal organization of activated α4β1 integrins regulates T lymphocyte adhesion.
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Affiliation(s)
- Alberto Sosa-Costa
- From the Institut de Ciencies Fotoniques, Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
| | - Sol Isern de Val
- the Centro de Investigaciones Biológicas, Department of Cellular and Molecular Medicine, 28040 Madrid, Spain, and
| | - Silvia Sevilla-Movilla
- the Centro de Investigaciones Biológicas, Department of Cellular and Molecular Medicine, 28040 Madrid, Spain, and
| | - Kyra J E Borgman
- From the Institut de Ciencies Fotoniques, Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
| | - Carlo Manzo
- From the Institut de Ciencies Fotoniques, Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
| | - Joaquin Teixidó
- the Centro de Investigaciones Biológicas, Department of Cellular and Molecular Medicine, 28040 Madrid, Spain, and
| | - Maria F Garcia-Parajo
- From the Institut de Ciencies Fotoniques, Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain, the ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
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Hauser MA, Legler DF. Common and biased signaling pathways of the chemokine receptor CCR7 elicited by its ligands CCL19 and CCL21 in leukocytes. J Leukoc Biol 2016; 99:869-82. [PMID: 26729814 DOI: 10.1189/jlb.2mr0815-380r] [Citation(s) in RCA: 127] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 12/17/2015] [Indexed: 12/24/2022] Open
Abstract
Chemokines are pivotal regulators of cell migration during continuous immune surveillance, inflammation, homeostasis, and development. Chemokine binding to their 7-transmembrane domain, G-protein-coupled receptors causes conformational changes that elicit intracellular signaling pathways to acquire and maintain an asymmetric architectural organization and a polarized distribution of signaling molecules necessary for directional cell migration. Leukocytes rely on the interplay of chemokine-triggered migration modules to promote amoeboid-like locomotion. One of the most important chemokine receptors for adaptive immune cell migration is the CC-chemokine receptor CCR7. CCR7 and its ligands CCL19 and CCL21 control homing of T cells and dendritic cells to areas of the lymph nodes where T cell priming and the initiation of the adaptive immune response occur. Moreover, CCR7 signaling also contributes to T cell development in the thymus and to lymphorganogenesis. Although the CCR7-CCL19/CCL21 axis evolved to benefit the host, inappropriate regulation or use of these proteins can contribute or cause pathobiology of chronic inflammation, tumorigenesis, and metastasis, as well as autoimmune diseases. Therefore, it appears as the CCR7-CCL19/CCL21 axis is tightly regulated at numerous intersections. Here, we discuss the multiple regulatory mechanism of CCR7 signaling and its influence on CCR7 function. In particular, we focus on the functional diversity of the 2 CCR7 ligands, CCL19 and CCL21, as well as on their impact on biased signaling. The understanding of the molecular determinants of biased signaling and the multiple layers of CCR7 regulation holds the promise for potential future therapeutic intervention.
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Affiliation(s)
- Mark A Hauser
- Biotechnology Institute Thurgau at the University of Konstanz, Kreuzlingen, Switzerland
| | - Daniel F Legler
- Biotechnology Institute Thurgau at the University of Konstanz, Kreuzlingen, Switzerland
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12
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Martínez-Moreno M, Leiva M, Aguilera-Montilla N, Sevilla-Movilla S, Isern de Val S, Arellano-Sánchez N, Gutiérrez NC, Maldonado R, Martínez-López J, Buño I, García-Marco JA, Sánchez-Mateos P, Hidalgo A, García-Pardo A, Teixidó J. In vivo adhesion of malignant B cells to bone marrow microvasculature is regulated by α4β1 cytoplasmic-binding proteins. Leukemia 2015; 30:861-72. [PMID: 26658839 DOI: 10.1038/leu.2015.332] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 10/23/2015] [Accepted: 11/24/2015] [Indexed: 12/14/2022]
Abstract
Multiple myeloma (MM) and chronic lymphocytic leukemia (CLL) cells must attach to the bone marrow (BM) microvasculature before lodging in the BM microenvironment. Using intravital microscopy (IVM) of the BM calvariae we demonstrate that the α4β1 integrin is required for MM and CLL cell firm arrest onto the BM microvasculature, while endothelial P-selectin and E-selectin mediate cell rolling. Talin, kindlin-3 and ICAP-1 are β1-integrin-binding partners that regulate β1-mediated cell adhesion. We show that talin and kindlin-3 cooperatively stimulate high affinity and strength of α4β1-dependent MM and CLL cell attachment, whereas ICAP-1 negatively regulates this adhesion. A functional connection between talin/kindlin-3 and Rac1 was found to be required for MM cell attachment mediated by α4β1. Importantly, IVM analyses with talin- and kindlin-3-silenced MM cells indicate that these proteins are needed for cell arrest on the BM microvasculature. Instead, MM cell arrest is repressed by ICAP-1. Moreover, MM cells silenced for talin and kindlin-3, and cultured on α4β1 ligands showed higher susceptibility to bortezomib-mediated cell apoptosis. Our results highlight the requirement of α4β1 and selectins for the in vivo attachment of MM and CLL cells to the BM microvasculature, and indicate that talin, kindlin-3 and ICAP-1 differentially control physiological adhesion by regulating α4β1 activity.
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Affiliation(s)
- M Martínez-Moreno
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), Madrid, Spain
| | - M Leiva
- Area of Cell and Developmental Biology, Fundación Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain
| | - N Aguilera-Montilla
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), Madrid, Spain
| | - S Sevilla-Movilla
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), Madrid, Spain
| | - S Isern de Val
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), Madrid, Spain
| | - N Arellano-Sánchez
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), Madrid, Spain
| | - N C Gutiérrez
- Department of Hematology, Hospital Universitario de Salamanca, Salamanca, Spain
| | - R Maldonado
- Section of Hematology, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - J Martínez-López
- Section of Hematology, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - I Buño
- Section of Hematology, Hospital General Universitario Gregorio Marañón, Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
| | - J A García-Marco
- Hematology Unit, Hospital Universitario Puerta de Hierro, Madrid, Spain
| | - P Sánchez-Mateos
- Section of Immuno-Oncology, Hospital General Universitario Gregorio Marañón, Complutense University School of Medicine, Madrid, Spain
| | - A Hidalgo
- Area of Cell and Developmental Biology, Fundación Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain.,Institute for Cardiovascular Prevention, Ludwig-Maximilians-University, Munich, Germany
| | - A García-Pardo
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), Madrid, Spain
| | - J Teixidó
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas (CSIC), Madrid, Spain
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13
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Kuropka B, Witte A, Sticht J, Waldt N, Majkut P, Hackenberger CPR, Schraven B, Krause E, Kliche S, Freund C. Analysis of Phosphorylation-dependent Protein Interactions of Adhesion and Degranulation Promoting Adaptor Protein (ADAP) Reveals Novel Interaction Partners Required for Chemokine-directed T cell Migration. Mol Cell Proteomics 2015; 14:2961-72. [PMID: 26246585 DOI: 10.1074/mcp.m115.048249] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Indexed: 11/06/2022] Open
Abstract
Stimulation of T cells leads to distinct changes of their adhesive and migratory properties. Signal propagation from activated receptors to integrins depends on scaffolding proteins such as the adhesion and degranulation promoting adaptor protein (ADAP)(1). Here we have comprehensively investigated the phosphotyrosine interactome of ADAP in T cells and define known and novel interaction partners of functional relevance. While most phosphosites reside in unstructured regions of the protein, thereby defining classical SH2 domain interaction sites for master regulators of T cell signaling such as SLP76, Fyn-kinase, and NCK, other binding events depend on structural context. Interaction proteomics using different ADAP constructs comprising most of the known phosphotyrosine motifs as well as the structured domains confirm that a distinct set of proteins is attracted by pY571 of ADAP, including the ζ-chain-associated protein kinase of 70 kDa (ZAP70). The interaction of ADAP and ZAP70 is inducible upon stimulation either of the T cell receptor (TCR) or by chemokine. NMR spectroscopy reveals that the N-terminal SH2 domains within a ZAP70-tandem-SH2 construct is the major site of interaction with phosphorylated ADAP-hSH3(N) and microscale thermophoresis (MST) indicates an intermediate binding affinity (Kd = 2.3 μm). Interestingly, although T cell receptor dependent events such as T cell/antigen presenting cell (APC) conjugate formation and adhesion are not affected by mutation of Y571, migration of T cells along a chemokine gradient is compromised. Thus, although most phospho-sites in ADAP are linked to T cell receptor related functions we have identified a unique phosphotyrosine that is solely required for chemokine induced T cell behavior.
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Affiliation(s)
- Benno Kuropka
- From the ‡Freie Universität Berlin, Institut für Chemie und Biochemie, Protein Biochemistry group, Thielallee 63, 14195 Berlin, Germany; §Leibniz-Institut für Molekulare Pharmakologie, Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Amelie Witte
- ¶Otto-von-Guericke-University, Institute of Molecular and Clinical Immunology, Leipziger Strasse 44, 39120 Magdeburg, Germany
| | - Jana Sticht
- From the ‡Freie Universität Berlin, Institut für Chemie und Biochemie, Protein Biochemistry group, Thielallee 63, 14195 Berlin, Germany
| | - Natalie Waldt
- ¶Otto-von-Guericke-University, Institute of Molecular and Clinical Immunology, Leipziger Strasse 44, 39120 Magdeburg, Germany
| | - Paul Majkut
- §Leibniz-Institut für Molekulare Pharmakologie, Robert-Rössle-Strasse 10, 13125 Berlin, Germany; ‖RiNA GmbH, Volmerstrasse 9, 12489 Berlin, Germany
| | | | - Burkhart Schraven
- ¶Otto-von-Guericke-University, Institute of Molecular and Clinical Immunology, Leipziger Strasse 44, 39120 Magdeburg, Germany; **Helmholtz Center for Infection Research (HZI), Department of Immune Control, Inhoffenstrasse 7, 38124 Braunschweig, Germany
| | - Eberhard Krause
- §Leibniz-Institut für Molekulare Pharmakologie, Robert-Rössle-Strasse 10, 13125 Berlin, Germany;
| | - Stefanie Kliche
- ¶Otto-von-Guericke-University, Institute of Molecular and Clinical Immunology, Leipziger Strasse 44, 39120 Magdeburg, Germany;
| | - Christian Freund
- From the ‡Freie Universität Berlin, Institut für Chemie und Biochemie, Protein Biochemistry group, Thielallee 63, 14195 Berlin, Germany;
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Mellado M, Martínez-Muñoz L, Cascio G, Lucas P, Pablos JL, Rodríguez-Frade JM. T Cell Migration in Rheumatoid Arthritis. Front Immunol 2015; 6:384. [PMID: 26284069 PMCID: PMC4515597 DOI: 10.3389/fimmu.2015.00384] [Citation(s) in RCA: 178] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 07/13/2015] [Indexed: 12/17/2022] Open
Abstract
Rheumatoid arthritis (RA) is an autoimmune disease characterized by chronic inflammation in joints, associated with synovial hyperplasia and with bone and cartilage destruction. Although the primacy of T cell-related events early in the disease continues to be debated, there is strong evidence that autoantigen recognition by specific T cells is crucial to the pathophysiology of rheumatoid synovitis. In addition, T cells are key components of the immune cell infiltrate detected in the joints of RA patients. Initial analysis of the cytokines released into the synovial membrane showed an imbalance, with a predominance of proinflammatory mediators, indicating a deleterious effect of Th1 T cells. There is nonetheless evidence that Th17 cells also play an important role in RA. T cells migrate from the bloodstream to the synovial tissue via their interactions with the endothelial cells that line synovial postcapillary venules. At this stage, selectins, integrins, and chemokines have a central role in blood cell invasion of synovial tissue, and therefore in the intensity of the inflammatory response. In this review, we will focus on the mechanisms involved in T cell attraction to the joint, the proteins involved in their extravasation from blood vessels, and the signaling pathways activated. Knowledge of these processes will lead to a better understanding of the mechanism by which the systemic immune response causes local joint disorders and will help to provide a molecular basis for therapeutic strategies.
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Affiliation(s)
- Mario Mellado
- Department of Immunology and Oncology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones , Madrid , Spain
| | - Laura Martínez-Muñoz
- Department of Immunology and Oncology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones , Madrid , Spain
| | - Graciela Cascio
- Department of Immunology and Oncology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones , Madrid , Spain
| | - Pilar Lucas
- Department of Immunology and Oncology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones , Madrid , Spain
| | - José L Pablos
- Grupo de Enfermedades Inflamatorias y Autoinmunes, Instituto de Investigación Sanitaria Hospital , Madrid , Spain
| | - José Miguel Rodríguez-Frade
- Department of Immunology and Oncology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones , Madrid , Spain
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15
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Dios-Esponera A, Isern de Val S, Sevilla-Movilla S, García-Verdugo R, García-Bernal D, Arellano-Sánchez N, Cabañas C, Teixidó J. Positive and negative regulation by SLP-76/ADAP and Pyk2 of chemokine-stimulated T-lymphocyte adhesion mediated by integrin α4β1. Mol Biol Cell 2015. [PMID: 26202465 PMCID: PMC4569313 DOI: 10.1091/mbc.e14-07-1246] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Stimulation by chemokines of integrin α4β1-dependent T-lymphocyte adhesion is a crucial step for lymphocyte trafficking. The adaptor Vav1 is required for chemokine-activated T-cell adhesion mediated by α4β1. Conceivably, proteins associating with Vav1 could potentially modulate this adhesion. Correlating with activation by the chemokine CXCL12 of T-lymphocyte attachment to α4β1 ligands, a transient stimulation in the association of Vav1 with SLP-76, Pyk2, and ADAP was observed. Using T-cells depleted for SLP-76, ADAP, or Pyk2, or expressing Pyk2 kinase-inactive forms, we show that SLP-76 and ADAP stimulate chemokine-activated, α4β1-mediated adhesion, whereas Pyk2 opposes T-cell attachment. While CXCL12-promoted generation of high-affinity α4β1 is independent of SLP-76, ADAP, and Pyk2, the strength of α4β1-VCAM-1 interaction and cell spreading on VCAM-1 are targets of regulation by these three proteins. GTPase assays, expression of activated or dominant-negative Rac1, or combined ADAP and Pyk2 silencing indicated that Rac1 activation by CXCL12 is a common mediator response in SLP-76-, ADAP-, and Pyk2-regulated cell adhesion involving α4β1. Our data strongly suggest that chemokine-stimulated associations between Vav1, SLP-76, and ADAP facilitate Rac1 activation and α4β1-mediated adhesion, whereas Pyk2 opposes this adhesion by limiting Rac1 activation.
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Affiliation(s)
- Ana Dios-Esponera
- Centro de Investigaciones Biológicas (CSIC), Department of Cellular and Molecular Medicine, 28040 Madrid, Spain
| | - Soledad Isern de Val
- Centro de Investigaciones Biológicas (CSIC), Department of Cellular and Molecular Medicine, 28040 Madrid, Spain
| | - Silvia Sevilla-Movilla
- Centro de Investigaciones Biológicas (CSIC), Department of Cellular and Molecular Medicine, 28040 Madrid, Spain
| | - Rosa García-Verdugo
- Centro de Investigaciones Biológicas (CSIC), Department of Cellular and Molecular Medicine, 28040 Madrid, Spain
| | - David García-Bernal
- Centro de Investigaciones Biológicas (CSIC), Department of Cellular and Molecular Medicine, 28040 Madrid, Spain
| | - Nohemí Arellano-Sánchez
- Centro de Investigaciones Biológicas (CSIC), Department of Cellular and Molecular Medicine, 28040 Madrid, Spain
| | - Carlos Cabañas
- Centro de Biología Molecular (CSIC), Department of Cell Biology and Immunology, Cantoblanco, 28049 Madrid, Spain
| | - Joaquin Teixidó
- Centro de Investigaciones Biológicas (CSIC), Department of Cellular and Molecular Medicine, 28040 Madrid, Spain
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16
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Involvement of the Rac1-IRSp53-Wave2-Arp2/3 Signaling Pathway in HIV-1 Gag Particle Release in CD4 T Cells. J Virol 2015; 89:8162-81. [PMID: 26018170 DOI: 10.1128/jvi.00469-15] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Accepted: 05/14/2015] [Indexed: 12/18/2022] Open
Abstract
UNLABELLED During HIV-1 assembly, the Gag viral proteins are targeted and assemble at the inner leaflet of the cell plasma membrane. This process could modulate the cortical actin cytoskeleton, located underneath the plasma membrane, since actin dynamics are able to promote localized membrane reorganization. In addition, activated small Rho GTPases are known for regulating actin dynamics and membrane remodeling. Therefore, the modulation of such Rho GTPase activity and of F-actin by the Gag protein during virus particle formation was considered. Here, we studied the implication of the main Rac1, Cdc42, and RhoA small GTPases, and some of their effectors, in this process. The effect of small interfering RNA (siRNA)-mediated Rho GTPases and silencing of their effectors on Gag localization, Gag membrane attachment, and virus-like particle production was analyzed by immunofluorescence coupled to confocal microscopy, membrane flotation assays, and immunoblot assays, respectively. In parallel, the effect of Gag expression on the Rac1 activation level was monitored by G-LISA, and the intracellular F-actin content in T cells was monitored by flow cytometry and fluorescence microscopy. Our results revealed the involvement of activated Rac1 and of the IRSp53-Wave2-Arp2/3 signaling pathway in HIV-1 Gag membrane localization and particle release in T cells as well as a role for actin branching and polymerization, and this was solely dependent on the Gag viral protein. In conclusion, our results highlight a new role for the Rac1-IRSp53-Wave2-Arp2/3 signaling pathway in the late steps of HIV-1 replication in CD4 T lymphocytes. IMPORTANCE During HIV-1 assembly, the Gag proteins are targeted and assembled at the inner leaflet of the host cell plasma membrane. Gag interacts with specific membrane phospholipids that can also modulate the regulation of cortical actin cytoskeleton dynamics. Actin dynamics can promote localized membrane reorganization and thus can be involved in facilitating Gag assembly and particle formation. Activated small Rho GTPases and effectors are regulators of actin dynamics and membrane remodeling. We thus studied the effects of the Rac1, Cdc42, and RhoA GTPases and their specific effectors on HIV-1 Gag membrane localization and viral particle release in T cells. Our results show that activated Rac1 and the IRSp53-Wave2-Arp2/3 signaling pathway are involved in Gag plasma membrane localization and viral particle production. This work uncovers a role for cortical actin through the activation of Rac1 and the IRSp53/Wave2 signaling pathway in HIV-1 particle formation in CD4 T lymphocytes.
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17
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Cascio G, Martín-Cófreces NB, Rodríguez-Frade JM, López-Cotarelo P, Criado G, Pablos JL, Rodríguez-Fernández JL, Sánchez-Madrid F, Mellado M. CXCL12 Regulates through JAK1 and JAK2 Formation of Productive Immunological Synapses. THE JOURNAL OF IMMUNOLOGY 2015; 194:5509-19. [PMID: 25917087 DOI: 10.4049/jimmunol.1402419] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 03/23/2015] [Indexed: 11/19/2022]
Abstract
The adaptive immune response requires interaction between T cells and APC to form a specialized structure termed the immune synapse (IS). Although the TCR is essential for IS organization, other factors such as chemokines participate in this process. In this study, we show that the chemokine CXCL12-mediated signaling contributes to correct IS organization and therefore influences T cell activation. CXCR4 downregulation or blockade on T cells caused defective actin polymerization at the contact site with APC, altered microtubule-organizing center polarization and the IS structure, and reduced T cell/APC contact duration. T cell activation was thus inhibited, as shown by reduced expression of CD25 and CD69 markers and of IL-2 mRNA levels. The results indicate that, through Gi and JAK1 and 2 kinases activation, CXCL12 signaling cooperates to build the IS and to maintain adhesive contacts between APC and T cells, required for continuous TCR signaling.
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Affiliation(s)
- Graciela Cascio
- Departamento de Inmunología y Oncología, Centro Nacional de Biotecnología/Consejo Superior de Investigaciones Cientificas, E-28049 Madrid, Spain
| | - Noa B Martín-Cófreces
- Servicio de Inmunología, Instituto de Investigación Sanitaria Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, E-28006 Madrid, Spain
| | - José Miguel Rodríguez-Frade
- Departamento de Inmunología y Oncología, Centro Nacional de Biotecnología/Consejo Superior de Investigaciones Cientificas, E-28049 Madrid, Spain
| | - Pilar López-Cotarelo
- Departamento de Biología Vascular e Inflamación, Fundación Centro Nacional de Investigaciones Cardiovasculares-Carlos III, E-28029 Madrid, Spain; Centro de Investigaciones Biológicas/Consejo Superior de Investigaciones Cientificas, E-28040 Madrid, Spain; and
| | - Gabriel Criado
- Grupo de Enfermedades Inflamatorias y Autoinmunes, Instituto de Investigación Sanitaria Hospital 12 de Octubre, E-28041 Madrid, Spain
| | - José L Pablos
- Grupo de Enfermedades Inflamatorias y Autoinmunes, Instituto de Investigación Sanitaria Hospital 12 de Octubre, E-28041 Madrid, Spain
| | - José Luis Rodríguez-Fernández
- Departamento de Biología Vascular e Inflamación, Fundación Centro Nacional de Investigaciones Cardiovasculares-Carlos III, E-28029 Madrid, Spain; Centro de Investigaciones Biológicas/Consejo Superior de Investigaciones Cientificas, E-28040 Madrid, Spain; and
| | - Francisco Sánchez-Madrid
- Servicio de Inmunología, Instituto de Investigación Sanitaria Hospital Universitario de la Princesa, Universidad Autónoma de Madrid, E-28006 Madrid, Spain
| | - Mario Mellado
- Departamento de Inmunología y Oncología, Centro Nacional de Biotecnología/Consejo Superior de Investigaciones Cientificas, E-28049 Madrid, Spain;
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19
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Gunawan M, Venkatesan N, Loh JT, Wong JF, Berger H, Neo WH, Li LYJ, La Win MK, Yau YH, Guo T, See PCE, Yamazaki S, Chin KC, Gingras AR, Shochat SG, Ng LG, Sze SK, Ginhoux F, Su IH. The methyltransferase Ezh2 controls cell adhesion and migration through direct methylation of the extranuclear regulatory protein talin. Nat Immunol 2015; 16:505-16. [DOI: 10.1038/ni.3125] [Citation(s) in RCA: 120] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 02/12/2015] [Indexed: 12/11/2022]
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20
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Yang J, Zhu L, Zhang H, Hirbawi J, Fukuda K, Dwivedi P, Liu J, Byzova T, Plow EF, Wu J, Qin J. Conformational activation of talin by RIAM triggers integrin-mediated cell adhesion. Nat Commun 2014; 5:5880. [PMID: 25520155 PMCID: PMC4432866 DOI: 10.1038/ncomms6880] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 11/18/2014] [Indexed: 12/13/2022] Open
Abstract
The membrane localization and activation of cytoskeletal protein talin are key steps to initiate the integrin transmembrane receptors' activation, which mediates many cellular adhesive responses such as cell migration, spreading and proliferation. RIAM, a membrane anchor and small GTPase RAP1 effector, is known to bind to the C-terminal rod domain of talin (talin-R) and promote localizations of talin to the membrane. Through systematic mapping analysis, we find that RIAM also binds to the N-terminal head of talin (talin-H), a crucial domain involved in binding and activating integrins. We show that the RIAM binding to talin-H sterically occludes the binding of a talin-R domain that otherwise masks the integrin-binding site on talin-H. We further provide functional evidence that such RIAM-mediated steric unmasking of talin triggers integrin activation. Our findings thus uncover a novel role for RIAM in conformational regulation of talin during integrin activation and cell adhesion.
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Affiliation(s)
- Jun Yang
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195
| | - Liang Zhu
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195
- Department of Biochemistry, Case Western Reserve University, Cleveland, OH 44106
| | - Hao Zhang
- Developmental Therapeutics Program, Fox Chase Cancer Center, 333 Cottman Ave., Philadelphia, PA 19111
| | - Jamila Hirbawi
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195
| | - Koichi Fukuda
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195
| | - Pallavi Dwivedi
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195
| | - Jianmin Liu
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195
| | - Tatiana Byzova
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195
| | - Edward F. Plow
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195
| | - Jinhua Wu
- Developmental Therapeutics Program, Fox Chase Cancer Center, 333 Cottman Ave., Philadelphia, PA 19111
| | - Jun Qin
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, OH 44195
- Department of Biochemistry, Case Western Reserve University, Cleveland, OH 44106
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21
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Klasen C, Ohl K, Sternkopf M, Shachar I, Schmitz C, Heussen N, Hobeika E, Levit-Zerdoun E, Tenbrock K, Reth M, Bernhagen J, El Bounkari O. MIF promotes B cell chemotaxis through the receptors CXCR4 and CD74 and ZAP-70 signaling. THE JOURNAL OF IMMUNOLOGY 2014; 192:5273-84. [PMID: 24760155 DOI: 10.4049/jimmunol.1302209] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Macrophage migration inhibitory factor (MIF) is a proinflammatory cytokine with chemokine-like functions that plays a pivotal role in the pathogenesis of inflammatory diseases by promoting leukocyte recruitment. We showed that MIF promotes the atherogenic recruitment of monocytes and T cells through its receptors CXCR2 and CXCR4. Effects of MIF on B cell recruitment have not been addressed. In this study, we tested the involvement of MIF in B cell chemotaxis and studied the underlying mechanism. We show that MIF promotes primary murine B cell chemotaxis in a dose-dependent manner, comparable to the B cell chemokines CXCL13 and CXCL12. Splenic B cells express CXCR4 and the receptor CD74 but not CXCR2. Inhibition of CXCR4 or CD74 or a genetic deficiency of Cd74 in primary B cells fully abrogated MIF-mediated B cell migration, implying cooperative involvement of both receptors. MIF stimulation of B cells resulted in a rapid increase in intracellular Ca(2+) mobilization and F-actin polymerization. Intriguingly, the tyrosine kinase ZAP-70 was activated upon MIF and CXCL12 treatment in a CXCR4- and CD74-dependent manner. Pharmacological inhibition of ZAP-70 resulted in abrogation of primary B cell migration. Functional involvement of ZAP-70 was confirmed by small interfering RNA-mediated knockdown in Ramos B cell migration. Finally, primary B cells from ZAP-70 gene-deficient mice exhibited ablated transmigration in response to MIF or CXCL12. We conclude that MIF promotes the migration of B cells through a ZAP-70-dependent pathway mediated by cooperative engagement of CXCR4 and CD74. The data also suggest that MIF may contribute to B cell recruitment in vivo (e.g., in B cell-related immune disorders).
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Affiliation(s)
- Christina Klasen
- Institute of Biochemistry and Molecular Cell Biology, Rheinisch-Westfälisch Technical University (RWTH) Aachen, D-52074 Aachen, Germany
| | - Kim Ohl
- Department of Pediatrics, Rheinisch-Westfälisch Technical University (RWTH) Aachen, D-52074 Aachen, Germany
| | - Marieke Sternkopf
- Institute of Biochemistry and Molecular Cell Biology, Rheinisch-Westfälisch Technical University (RWTH) Aachen, D-52074 Aachen, Germany
| | | | - Corinna Schmitz
- Institute of Biochemistry and Molecular Cell Biology, Rheinisch-Westfälisch Technical University (RWTH) Aachen, D-52074 Aachen, Germany
| | - Nicole Heussen
- Institute of Medical Statistics, Rheinisch-Westfälisch Technical University (RWTH) Aachen, D-52074 Aachen, Germany
| | - Elias Hobeika
- Department of Molecular Immunology, Biology III, University of Freiburg, 79108 Freiburg, Germany; and Max Planck Institute for Immunobiology and Epigenetics, 79108 Freiburg, Germany
| | - Ella Levit-Zerdoun
- Department of Molecular Immunology, Biology III, University of Freiburg, 79108 Freiburg, Germany; and Max Planck Institute for Immunobiology and Epigenetics, 79108 Freiburg, Germany
| | - Klaus Tenbrock
- Department of Pediatrics, Rheinisch-Westfälisch Technical University (RWTH) Aachen, D-52074 Aachen, Germany
| | - Michael Reth
- Department of Molecular Immunology, Biology III, University of Freiburg, 79108 Freiburg, Germany; and Max Planck Institute for Immunobiology and Epigenetics, 79108 Freiburg, Germany
| | - Jürgen Bernhagen
- Institute of Biochemistry and Molecular Cell Biology, Rheinisch-Westfälisch Technical University (RWTH) Aachen, D-52074 Aachen, Germany;
| | - Omar El Bounkari
- Institute of Biochemistry and Molecular Cell Biology, Rheinisch-Westfälisch Technical University (RWTH) Aachen, D-52074 Aachen, Germany;
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Willenbrock F, Zicha D, Hoppe A, Hogg N. Novel automated tracking analysis of particles subjected to shear flow: kindlin-3 role in B cells. Biophys J 2014; 105:1110-22. [PMID: 24010654 PMCID: PMC3762340 DOI: 10.1016/j.bpj.2013.06.051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 05/16/2013] [Accepted: 06/18/2013] [Indexed: 12/23/2022] Open
Abstract
Shear flow assays are used to mimic the influence of physiological shear force in diverse situations such as leukocyte rolling and arrest on the vasculature, capture of nanoparticles, and bacterial adhesion. Analysis of such assays usually involves manual counting, is labor-intensive, and is subject to bias. We have developed the Leukotrack program that incorporates a novel (to our knowledge) segmentation routine capable of reliable detection of cells in phase contrast images. The program also automatically tracks rolling cells in addition to those that are more firmly attached and migrating in random directions. We demonstrate its use in the analysis of lymphocyte arrest mediated by one or more active conformations of the integrin LFA-1. Activation of LFA-1 is a multistep process that depends on several proteins including kindlin-3, the protein that is mutated in leukocyte adhesion deficiency-III patients. We find that the very first stage of LFA-1-mediated attaching is unable to proceed in the absence of kindlin-3. Our evidence indicates that kindlin-3-mediated high-affinity LFA-1 controls both the early transient integrin-dependent adhesions in addition to the final stable adhesions made under flow conditions.
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23
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Jenkins MR, Stinchcombe JC, Au-Yeung BB, Asano Y, Ritter AT, Weiss A, Griffiths GM. Distinct structural and catalytic roles for Zap70 in formation of the immunological synapse in CTL. eLife 2014; 3:e01310. [PMID: 24596147 PMCID: PMC3936284 DOI: 10.7554/elife.01310] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Accepted: 01/22/2014] [Indexed: 11/13/2022] Open
Abstract
T cell receptor (TCR) activation leads to a dramatic reorganisation of both membranes and receptors as the immunological synapse forms. Using a genetic model to rapidly inhibit Zap70 catalytic activity we examined synapse formation between cytotoxic T lymphocytes and their targets. In the absence of Zap70 catalytic activity Vav-1 activation occurs and synapse formation is arrested at a stage with actin and integrin rich interdigitations forming the interface between the two cells. The membranes at the synapse are unable to flatten to provide extended contact, and Lck does not cluster to form the central supramolecular activation cluster (cSMAC). Centrosome polarisation is initiated but aborts before reaching the synapse and the granules do not polarise. Our findings reveal distinct roles for Zap70 as a structural protein regulating integrin-mediated control of actin vs its catalytic activity that regulates TCR-mediated control of actin and membrane remodelling during formation of the immunological synapse. DOI: http://dx.doi.org/10.7554/eLife.01310.001.
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Affiliation(s)
- Misty R Jenkins
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
| | - Jane C Stinchcombe
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
| | - Byron B Au-Yeung
- Department of Medicine, University of California, San Francisco, San Francisco, United States
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, United States
- Howard Hughes Medical Institue, University of California, San Francisco, San Francisco, United States
| | - Yukako Asano
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
| | - Alex T Ritter
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
- Cell Biology and Metabolism Branch, National Institutes of Health, Bethesda, United States
| | - Arthur Weiss
- Department of Medicine, University of California, San Francisco, San Francisco, United States
- Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, United States
- Howard Hughes Medical Institue, University of California, San Francisco, San Francisco, United States
| | - Gillian M Griffiths
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom
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24
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Abstract
Tight regulation of actin dynamics is essential for T-cell trafficking and activation. Recent studies in human and murine T cells reveal that T-cell motility and full T-cell activation require the hematopoietic-specific, actin-bundling protein L-plastin (LPL). T cells lacking LPL do not form fully mature synapses and thus demonstrate reduced cytokine production and proliferation. Reduction or loss of LPL expression also reduces the velocity of T cells and impairs thymic egress and intranodal motility. Whereas dispensable for proximal T-cell receptor and chemokine receptor signaling, LPL is critical to the later stages of synapse maturation and cellular polarization. Serine phosphorylation, calcium, and calmodulin binding regulate the bundling activity and localization of LPL following T-cell receptor and chemokine receptor engagement. However, the interaction between these regulatory domains and resulting changes in local control of actin cytoskeletal structures has not been fully elucidated. Circumstantial evidence suggests a function for LPL in either the formation or maintenance of integrin-associated adhesion structures. As LPL may be a target of the commonly used immunosuppressive agent dexamethasone, full elucidation of the regulation and function of LPL in T-cell biology may illuminate new pathways for clinically useful immunotherapeutics.
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Affiliation(s)
- Sharon Celeste Morley
- Department of Pediatrics, Division of Infectious Diseases, Washington University School of Medicine, St. Louis, MO, USA; Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA
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25
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Pérez-Rivero G, Cascio G, Soriano SF, Sanz ÁG, de Guinoa JS, Rodríguez-Frade JM, Gomariz RP, Holgado BL, Cabañas C, Carrasco YR, Stein JV, Mellado M. Janus kinases 1 and 2 regulate chemokine-mediated integrin activation and naïve T-cell homing. Eur J Immunol 2013; 43:1745-57. [PMID: 23526587 DOI: 10.1002/eji.201243178] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 02/08/2013] [Accepted: 03/19/2013] [Indexed: 12/21/2022]
Abstract
Janus kinases (JAKs) are central signaling molecules in cytokine receptor cascades. Although they have also been implicated in chemokine receptor signaling, this function continues to be debated. To address this issue, we established a nucleofection model in primary, nonactivated mouse T lymphocytes to silence JAK expression and to evaluate the ability of these cells to home to lymph nodes. Reduced JAK1 and JAK2 expression impaired naïve T-cell migration in response to gradients of the chemokines CXCL12 and CCL21. In vivo homing of JAK1/JAK2-deficient cells to lymph nodes decreased, whereas intranodal localization and motility were unaffected. JAK1 and JAK2 defects altered CXCL12- and CCL21-triggered ezrin/radixin/moesin (ERM) dephosphorylation and F-actin polymerization, as well as activation of lymphocyte function-associated Ag-1 and very late Ag-4 integrins. As a result, the cells did not adhere firmly to integrin substrates in response to these chemokines. The results demonstrate that JAK1/JAK2 participate in chemokine-induced integrin activation and might be considered a target for modulation of immune cell extravasation and therefore, control of inflammatory reactions.
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Affiliation(s)
- Gema Pérez-Rivero
- Department of Immunology and Oncology, Centro Nacional de Biotecnología/CSIC, Campus de Cantoblanco, Madrid, Spain
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26
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CBAP functions as a novel component in chemokine-induced ZAP70-mediated T-cell adhesion and migration. PLoS One 2013; 8:e61761. [PMID: 23620790 PMCID: PMC3631140 DOI: 10.1371/journal.pone.0061761] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 03/11/2013] [Indexed: 01/22/2023] Open
Abstract
Activated chemokine receptor initiates inside-out signaling to transiently trigger activation of integrins, a process involving multiple components that have not been fully characterized. Here we report that GM-CSF/IL-3/IL-5 receptor common beta-chain-associated protein (CBAP) is required to optimize this inside-out signaling and activation of integrins. First, knockdown of CBAP expression in human Jurkat T cells caused attenuated CXC chemokine ligand-12 (CXCL12)-induced cell migration and integrin α4β1- and αLβ2-mediated cell adhesion in vitro, which could be rescued sufficiently upon expression of murine CBAP proteins. Freshly isolated CBAP-deficient primary T cells also exhibited diminution of chemotaxis toward CC chemokine ligand-21 (CCL21) and CXCL12, and these chemokines-induced T-cell adhesions in vitro. Adoptive transfer of isolated naive T cells demonstrated that CBAP deficiency significantly reduced lymph node homing ability in vivo. Finally, migration of T cell-receptor-activated T cells induced by inflammatory chemokines was also attenuated in CBAP-deficient cells. Further analyses revealed that CBAP constitutively associated with both integrin β1 and ZAP70 and that CBAP is required for chemokine-induced initial binding of the talin-Vav1 complex to integrin β1 and to facilitate subsequent ZAP70-mediated dissociation of the talin-Vav1 complex and Vav1 phosphorylation. Within such an integrin signaling complex, CBAP likely functions as an adaptor and ultimately leads to activation of both integrin α4β1 and Rac1. Taken together, our data suggest that CBAP indeed can function as a novel signaling component within the ZAP70/Vav1/talin complex and plays an important role in regulating chemokine-promoted T-cell trafficking.
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27
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Chen EJH, Shaffer MH, Williamson EK, Huang Y, Burkhardt JK. Ezrin and moesin are required for efficient T cell adhesion and homing to lymphoid organs. PLoS One 2013; 8:e52368. [PMID: 23468835 PMCID: PMC3585410 DOI: 10.1371/journal.pone.0052368] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Accepted: 11/12/2012] [Indexed: 01/13/2023] Open
Abstract
T cell trafficking between the blood and lymphoid organs is a complex, multistep process that requires several highly dynamic and coordinated changes in cyto-architecture. Members of the ezrin, radixin and moesin (ERM) family of actin-binding proteins have been implicated in several aspects of this process, but studies have yielded conflicting results. Using mice with a conditional deletion of ezrin in CD4+ cells and moesin-specific siRNA, we generated T cells lacking ERM proteins, and investigated the effect on specific events required for T cell trafficking. ERM-deficient T cells migrated normally in multiple in vitro and in vivo assays, and could undergo efficient diapedesis in vitro. However, these cells were impaired in their ability to adhere to the β1 integrin ligand fibronectin, and to polarize appropriately in response to fibronectin and VCAM-1 binding. This defect was specific for β1 integrins, as adhesion and polarization in response to ICAM-1 were normal. In vivo, ERM-deficient T cells showed defects in homing to lymphoid organs. Taken together, these results show that ERM proteins are largely dispensable for T cell chemotaxis, but are important for β1 integrin function and homing to lymphoid organs.
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Affiliation(s)
- Emily J. H. Chen
- Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia and the Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Meredith H. Shaffer
- Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia and the Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Edward K. Williamson
- Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia and the Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Yanping Huang
- Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia and the Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Janis K. Burkhardt
- Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia and the Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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28
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Lee D, Kim J, Baker RG, Koretzky GA, Hammer DA. SLP-76 is required for optimal CXCR4-stimulated T lymphocyte firm arrest to ICAM-1 under shear flow. Eur J Immunol 2012; 42:2736-43. [PMID: 22806433 PMCID: PMC3902640 DOI: 10.1002/eji.201142303] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2011] [Revised: 04/12/2012] [Accepted: 07/09/2012] [Indexed: 11/06/2022]
Abstract
Rapid arrest of T cells at target sites upon engagement of chemokine receptors is crucial to the proper functioning of the immune system. Although T-cell arrest always occurs under hydrodynamic forces in vivo, most studies investigating the molecular mechanisms of arrest have been performed under static conditions. While the requirement of the adapter protein SLP-76 (Src homology 2-domain containing leukocyte-specific phosphoprotein of 76 kDa) in TCR-induced integrin activation has been demonstrated, its role in chemokine-triggered T-cell adhesion is unknown. Using a flow chamber system, we show that SLP-76 plays an important role in regulating the transition from tethering and rolling to firm adhesion of T cells under physiological shear flow in response to CXCL12α (stromal cell-derived factor-1α); SLP-76-deficient primary T cells exhibited defective adhesion with a significant decrease in the number of firmly arrested cells. We further demonstrate the N-terminal phosphotyrosines of SLP-76 play a critical role in T-cell adhesion under flow. These findings reveal a novel role for SLP-76 in CXCR4-mediated T lymphocyte trafficking.
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Affiliation(s)
- Dooyoung Lee
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104
| | - Jiyeon Kim
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
- Abramson Family Cancer Research Institute, University of Pennsylvania, Philadelphia, PA 19104
| | - Rebecca G. Baker
- Abramson Family Cancer Research Institute, University of Pennsylvania, Philadelphia, PA 19104
| | - Gary A. Koretzky
- Abramson Family Cancer Research Institute, University of Pennsylvania, Philadelphia, PA 19104
- Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Daniel A. Hammer
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104
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29
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Alon R, Feigelson SW. Chemokine-triggered leukocyte arrest: force-regulated bi-directional integrin activation in quantal adhesive contacts. Curr Opin Cell Biol 2012; 24:670-6. [PMID: 22770729 DOI: 10.1016/j.ceb.2012.06.001] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Revised: 05/24/2012] [Accepted: 06/11/2012] [Indexed: 10/28/2022]
Abstract
The arrest of rolling leukocytes on target vascular beds is mediated by specialized leukocyte integrins and their endothelial ligands. In the circulation, these integrins are generally maintained as inactive 'clasped' heterodimers. Encounter by leukocytes of specialized endothelial-presented chemoattractants termed arrest chemokines drive these integrins to undergo force-regulated biochemical conformational changes in response to signals from chemokine-stimulated Gi-protein coupled receptors (GPCRs) and actin remodeling Rho GTPases. To arrest rolling leukocytes, integrin:ligand bonds must undergo stabilization by several orders of magnitude within quantal submicron contacts that consist of discrete integrin:ligand bonds. We present a unifying three step model for rapid integrin activation by chemokines in the quantal arrest unit, the smallest firm adhesive contact formed by a rolling or a captured leukocyte: integrin extension triggered by talin, integrin headpiece opening driven by surface-immobilized ligand and stabilized by low force, and full heterodimer unclasping requiring integrin tail associations with actin-connected talin and Kindlin-3. Specialized GPCRs and their Gi-protein signaling assemblies drive these and other adaptors to specifically bind integrin cytoplasmic tails possibly in conjunction with de novo actin remodeling, thereby optimizing bi-directional activation of ligand-occupied integrins.
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Affiliation(s)
- Ronen Alon
- Department of Immunology, Weizmann Institute of Science, Rehovot 76100, Israel.
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30
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A novel membrane-dependent on/off switch mechanism of talin FERM domain at sites of cell adhesion. Cell Res 2012; 22:1533-45. [PMID: 22710802 DOI: 10.1038/cr.2012.97] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The activation of heterodimeric (α/β) integrin transmembrane receptors by cytosolic protein talin is crucial for regulating diverse cell-adhesion-dependent processes, including blood coagulation, tissue remodeling, and cancer metastasis. This process is triggered by the coincident binding of N-terminal FERM (four-point-one-protein/ezrin/radixin/moesin) domain of talin (talin-FERM) to the inner membrane surface and integrin β cytoplasmic tail, but how these binding events are spatiotemporally regulated remains obscure. Here we report the crystal structure of a dormant talin, revealing how a C-terminal talin rod segment (talin-RS) self-masks a key integrin-binding site on talin-FERM via a large interface. Unexpectedly, the structure also reveals a distinct negatively charged surface on talin-RS that electrostatically hinders the talin-FERM binding to the membrane. Such a dual inhibitory topology for talin is consistent with the biochemical and functional data, but differs significantly from a previous model. We show that upon enrichment with phosphotidylinositol-4,5-bisphosphate (PIP2) - a known talin activator, membrane strongly attracts a positively charged surface on talin-FERM and simultaneously repels the negatively charged surface on talin-RS. Such an electrostatic "pull-push" process promotes the relief of the dual inhibition of talin-FERM, which differs from the classic "steric clash" model for conventional PIP2-induced FERM domain activation. These data therefore unravel a new type of membrane-dependent FERM domain regulation and illustrate how it mediates the talin on/off switches to regulate integrin transmembrane signaling and cell adhesion.
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31
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Montresor A, Toffali L, Constantin G, Laudanna C. Chemokines and the signaling modules regulating integrin affinity. Front Immunol 2012; 3:127. [PMID: 22654882 PMCID: PMC3360201 DOI: 10.3389/fimmu.2012.00127] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Accepted: 05/03/2012] [Indexed: 01/05/2023] Open
Abstract
Integrin-mediated adhesion is a general concept referring to a series of adhesive phenomena including tethering–rolling, affinity, valency, and binding stabilization altogether controlling cell avidity (adhesiveness) for the substrate. Arrest chemokines modulate each aspect of integrin activation, although integrin affinity regulation has been recognized as the prominent event in rapid leukocyte arrest induced by chemokines. A variety of inside-out and outside-in signaling mechanisms have been related to the process of integrin-mediated adhesion in different cellular models, but only few of them have been clearly contextualized to rapid integrin affinity modulation by arrest chemokines in primary leukocytes. Complex signaling processes triggered by arrest chemokines and controlling leukocyte integrin activation have been described for ras-related rap and for rho-related small GTPases. We summarize the role of rap and rho small GTPases in the regulation of rapid integrin affinity in primary leukocytes and provide a modular view of these pro-adhesive signaling events. A potential, albeit still speculative, mechanism of rho-mediated regulation of cytoskeletal proteins controlling the last step of integrin activation is also discussed. We also discuss data suggesting a functional integration between the rho- and rap-modules of integrin activation. Finally we examine the universality of signaling mechanisms regulating integrin triggering by arrest chemokines.
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Affiliation(s)
- Alessio Montresor
- Division of General Pathology, Department of Pathology, University of Verona Verona, Italy
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32
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Perera HD, Ma YQ, Yang J, Hirbawi J, Plow EF, Qin J. Membrane binding of the N-terminal ubiquitin-like domain of kindlin-2 is crucial for its regulation of integrin activation. Structure 2012; 19:1664-71. [PMID: 22078565 DOI: 10.1016/j.str.2011.08.012] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Revised: 08/03/2011] [Accepted: 08/19/2011] [Indexed: 11/25/2022]
Abstract
Kindlin-2 belongs to an emerging class of regulators for heterodimeric (α/β) integrin adhesion receptors. By binding to integrin β cytoplasmic tail via its C-terminal FERM-like domain, kindlin-2 promotes integrin activation. Intriguingly, this activation process depends on the N terminus of kindlin-2 (K2-N) that precedes the FERM domain. The molecular function of K2-N is unclear. We present the solution structure of K2-N, which displays a ubiquitin fold similar to that observed in kindlin-1. Using chemical shift mapping and mutagenesis, we found that K2-N contains a conserved positively charged surface that binds to membrane enriched with negatively charged phosphatidylinositol-(4,5)-bisphosphate. We show that while wild-type kindlin-2 is capable of promoting integrin activation, such ability is significantly reduced for its membrane-binding defective mutant. These data suggest a membrane-binding function of the ubiquitin-like domain of kindlin-2, which is likely common for all kindlins to promote their localization to the plasma membrane and control integrin activation.
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Affiliation(s)
- H Dhanuja Perera
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, USA
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García-Bernal D, Dios-Esponera A, Sotillo-Mallo E, García-Verdugo R, Arellano-Sánchez N, Teixidó J. RGS10 restricts upregulation by chemokines of T cell adhesion mediated by α4β1 and αLβ2 integrins. THE JOURNAL OF IMMUNOLOGY 2011; 187:1264-72. [PMID: 21705617 DOI: 10.4049/jimmunol.1002960] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Chemokines rapidly and transiently upregulate α4β1 and αLβ2 integrin-mediated adhesion during T lymphocyte extravasation by activating Gα-dependent inside-out signaling. To limit and terminate Gα-mediated signaling, cells can use several mechanisms, including the action of regulator of G protein signaling (RGS) proteins, which accelerate the GTPase activity of Gα subunits. Using human T cells silenced for or overexpressing RGS10, we show in this article that RGS10 functions as an inhibitor of Gα(i)-dependent, chemokine-upregulated T cell adhesion mediated by α4β1 and αLβ2. Shear stress-dependent detachment and cell spreading analyses revealed that RGS10 action mainly targets the adhesion strengthening and spreading phases of α4β1-mediated cell attachment. Associated with these observations, chemokine-stimulated Vav1-Rac1 activation was longer sustained and of higher intensity in RGS10-silenced T cells, or inhibited in cells overexpressing RGS10. Of importance, expression of constitutively activated Rac1 forms in cells overexpressing RGS10 led to the rescue of CXCL12-stimulated adhesion to VCAM-1 to levels similar to those in control transfectants. Instead, adhesion under flow conditions, soluble binding experiment, flow cytometry, and biochemical analyses revealed that the earlier chemokine-triggered integrin activation step was mostly independent of RGS10 actions. The data strongly suggest that RGS10 opposes activation by chemokines of the Vav1-Rac1 pathway in T cells, leading to repression of adhesion strengthening mediated by α4β1. In addition to control chemokine-upregulated T cell attachment, RGS10 also limited adhesion-independent cell chemotaxis and activation of cdc42. These results identify RGS10 as a key molecule that contributes to the termination of Gα-dependent signaling during chemokine-activated α4β1- and αLβ2-dependent T cell adhesion.
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Affiliation(s)
- David García-Bernal
- Departamento de Medicina Celular y Molecular, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, 28040 Madrid, Spain
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Chemokine triggered integrin activation and actin remodeling events guiding lymphocyte migration across vascular barriers. Exp Cell Res 2011; 317:632-41. [PMID: 21376176 DOI: 10.1016/j.yexcr.2010.12.007] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Revised: 12/07/2010] [Accepted: 12/07/2010] [Indexed: 01/13/2023]
Abstract
Chemokine signals activate leukocyte integrins and actin remodeling machineries critical for leukocyte adhesion and motility across vascular barriers. The arrest of leukocytes at target blood vessel sites depends on rapid conformational activation of their α4 and β2 integrins by the binding of endothelial-displayed chemokines to leukocyte Gi-protein coupled receptors (GPCRs). A universal regulator of this event is the integrin-actin adaptor, talin1. Chemokine-stimulated GPCRs can transmit within fractions of seconds signals via multiple Rho GTPases, which locally raise plasma membrane levels of the talin activating phosphatidyl inositol, PtdIns(4,5)P2 (PIP2). Additional pools of GPCR stimulated Rac-1 and Rap-1 GTPases together with GPCR stimulated PLC and PI3K family members regulate the turnover of focal contacts of leukocyte integrins, induce the collapse of leukocyte microvilli, and promote polarized leukocyte crawling in search of exit cues. Concomitantly, other leukocyte GTPases trigger invasive protrusions into and between endothelial cells in search of basolateral chemokine exit cues. We will review here major findings and open questions related to these sequential guiding activities of endothelial presented chemokines, focusing mainly on lymphocyte-endothelial interactions as a paradigm for other leukocytes.
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36
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Hernández-Varas P, Coló GP, Bartolomé RA, Paterson A, Medraño-Fernández I, Arellano-Sánchez N, Cabañas C, Sánchez-Mateos P, Lafuente EM, Boussiotis VA, Strömblad S, Teixidó J. Rap1-GTP-interacting adaptor molecule (RIAM) protein controls invasion and growth of melanoma cells. J Biol Chem 2011; 286:18492-504. [PMID: 21454517 DOI: 10.1074/jbc.m110.189811] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Mig-10/RIAM/lamellipodin (MRL) family member Rap1-GTP-interacting adaptor molecule (RIAM) interacts with active Rap1, a small GTPase that is frequently activated in tumors such as melanoma and prostate cancer. We show here that RIAM is expressed in metastatic human melanoma cells and that both RIAM and Rap1 are required for BLM melanoma cell invasion. RIAM silencing in melanoma cells led to inhibition of tumor growth and to delayed metastasis in a severe combined immunodeficiency xenograft model. Defective invasion of RIAM-silenced melanoma cells arose from impairment in persistent cell migration directionality, which was associated with deficient activation of a Vav2-RhoA-ROCK-myosin light chain pathway. Expression of constitutively active Vav2 and RhoA in cells depleted for RIAM partially rescued their invasion, indicating that Vav2 and RhoA mediate RIAM function. These results suggest that inhibition of cell invasion in RIAM-silenced melanoma cells is likely based on altered cell contractility and cell polarization. Furthermore, we show that RIAM depletion reduces β1 integrin-dependent melanoma cell adhesion, which correlates with decreased activation of both Erk1/2 MAPK and phosphatidylinositol 3-kinase, two central molecules controlling cell growth and cell survival. In addition to causing inhibition of cell proliferation, RIAM silencing led to higher susceptibility to cell apoptosis. Together, these data suggest that defective activation of these kinases in RIAM-silenced cells could account for inhibition of melanoma cell growth and that RIAM might contribute to the dissemination of melanoma cells.
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Affiliation(s)
- Pablo Hernández-Varas
- Department of Cellular and Molecular Medicine, Centro de Investigaciones Biológicas, 28040 Madrid, Spain
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The integrin LFA-1 signals through ZAP-70 to regulate expression of high-affinity LFA-1 on T lymphocytes. Blood 2011; 117:3331-42. [PMID: 21200022 DOI: 10.1182/blood-2010-06-289140] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The integrin lymphocyte function-associated antigen 1 (LFA-1) controls many functions of T lymphocytes and is particularly essential during lymphocyte migration from blood into tissues. LFA-1 is considered to initiate "outside-in" signaling when bound to ligand intercellular adhesion molecule 1 (ICAM-1), but little is known about the proteins involved or where in the cell such LFA-1-mediated signaling might be operating. Here we show that LFA-1 is constitutively associated with the protein tyrosine kinases Lck and zeta chain-associated protein of 70 kDa (ZAP-70). When LFA-1 binds ICAM-1, both kinases become phosphorylated and the consequence of kinase activation is the conversion of intermediate- to high-affinity LFA-1 and an increase in close contact with ICAM-1. In the polarized T lymphocyte, phospho-ZAP-70 is concentrated within a region of high-affinity LFA-1 that includes talin and encompasses the lamella/lamellipodial interface as well as further back in the cell. Deficiency of ZAP-70 through inhibition or knockdown in T lymphocytes decreases the speed of migration on ICAM-1, as well as reducing firm adhesion under shear-flow conditions. Through its control of high-affinity LFA-1, the LFA-1/Lck/ZAP-70 complex is in position to initiate the rapid adhesion strengthening and migration necessary for T-lymphocyte responses when stimulated vasculature is encountered at sites of infection or injury.
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Manevich-Mendelson E, Grabovsky V, Feigelson SW, Cinamon G, Gore Y, Goverse G, Monkley SJ, Margalit R, Melamed D, Mebius RE, Critchley DR, Shachar I, Alon R. Talin1 is required for integrin-dependent B lymphocyte homing to lymph nodes and the bone marrow but not for follicular B-cell maturation in the spleen. Blood 2010; 116:5907-18. [PMID: 20923969 DOI: 10.1182/blood-2010-06-293506] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Talin1 is a key integrin coactivator. We investigated the roles of this cytoskeletal adaptor and its target integrins in B-cell lymphogenesis, differentiation, migration, and function. Using CD19 Cre-mediated depletion of talin1 selectively in B cells, we found that talin1 was not required for B-cell generation in the bone marrow or for the entry of immature B cells to the white pulp of the spleen. Loss of talin1 also did not affect B-cell maturation into follicular B cells but compromised differentiation of marginal zone B cells. Nevertheless, serum IgM and IgG levels remained normal. Ex vivo analysis of talin1-deficient spleen B cells indicated a necessary role for talin1 in LFA-1 and VLA-4 activation stimulated by canonical agonists, but not in B-cell chemotaxis. Consequently, talin1 null B splenocytes could not enter lymph nodes nor return to the bone marrow. Talin1 deficiency in B cells was also impaired in the humoral response to a T cell-dependent antigen. Collectively, these results indicate that talin1 is not required for follicular B-cell maturation in the spleen or homeostatic humoral immunity but is critical for integrin-dependent B lymphocyte emigration to lymph nodes and optimal immunity against T-dependent antigens.
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Lin YP, Cheng YJ, Huang JY, Lin HC, Yang BC. Zap70 controls the interaction of talin with integrin to regulate the chemotactic directionality of T-cell migration. Mol Immunol 2010; 47:2022-9. [PMID: 20488542 DOI: 10.1016/j.molimm.2010.04.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2010] [Revised: 04/13/2010] [Accepted: 04/19/2010] [Indexed: 12/18/2022]
Abstract
Aberrant lymphocyte infiltration is crucial for many disorders such as tumor immune escape and autoimmunity. In this study, we have investigated T-cell migration in a three-dimensional collagen matrix containing tumor spheroids and by using micro-Slide chemotaxis and found that Zap70 regulates directionality during cell chemotaxis. Jurkat cells actively migrated toward SDF-1, nutrition, and spheroids of MCF-7 breast carcinoma cells embedded in collagen matrix. Inhibition of Zap70 activity impaired transmigration and mu-Slide chemotaxis but not the random movement of T cells in the collagen/fibronectin matrix. P116 cells, a Zap70 deficient variant of Jurkat, showed active random movement but failed to migrate against chemoattractants. P116 cells exhibited a reduced polarization of cell morphology, showing less lamellipodia formation accompanied with a fast pseudopod turnover rate. Instead of direct interacting with F-actin, Zap70 formed a complex with talin which is an integrin scaffold for F-actin. SDF-1 enhanced Zap70 phosphorylation and also stimulated binding of talin and beta1 integrin activation. P116 cells showed reduced complex of talin and beta1 integrin in parallel with impaired integrin activation. Collectively, Zap70 modulates integrin activation by interacting with talin, which contributes to directionality of T-cell migration, severing as a potential target for anti-inflammation therapy.
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Affiliation(s)
- Yu-Ping Lin
- Institute of Basic Medical Sciences, National Cheng Kung University, Tainan 70428, Taiwan
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