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Alberici Delsin LE, Plutoni C, Clouvel A, Keil S, Marpeaux L, Elouassouli L, Khavari A, Ehrlicher AJ, Emery G. MAP4K4 regulates forces at cell-cell and cell-matrix adhesions to promote collective cell migration. Life Sci Alliance 2023; 6:e202302196. [PMID: 37369604 PMCID: PMC10300198 DOI: 10.26508/lsa.202302196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 06/12/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
Collective cell migration is not only important for development and tissue homeostasis but can also promote cancer metastasis. To migrate collectively, cells need to coordinate cellular extensions and retractions, adhesion sites dynamics, and forces generation and transmission. Nevertheless, the regulatory mechanisms coordinating these processes remain elusive. Using A431 carcinoma cells, we identify the kinase MAP4K4 as a central regulator of collective migration. We show that MAP4K4 inactivation blocks the migration of clusters, whereas its overexpression decreases cluster cohesion. MAP4K4 regulates protrusion and retraction dynamics, remodels the actomyosin cytoskeleton, and controls the stability of both cell-cell and cell-substrate adhesion. MAP4K4 promotes focal adhesion disassembly through the phosphorylation of the actin and plasma membrane crosslinker moesin but disassembles adherens junctions through a moesin-independent mechanism. By analyzing traction and intercellular forces, we found that MAP4K4 loss of function leads to a tensional disequilibrium throughout the cell cluster, increasing the traction forces and the tension loading at the cell-cell adhesions. Together, our results indicate that MAP4K4 activity is a key regulator of biomechanical forces at adhesion sites, promoting collective migration.
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Affiliation(s)
- Lara Elis Alberici Delsin
- Vesicular Trafficking and Cell Signalling Research Unit, Institute for Research in Immunology and Cancer https://ror.org/0161xgx34 (IRIC), Université de Montréal, Montréal, Canada
| | - Cédric Plutoni
- Vesicular Trafficking and Cell Signalling Research Unit, Institute for Research in Immunology and Cancer https://ror.org/0161xgx34 (IRIC), Université de Montréal, Montréal, Canada
| | - Anna Clouvel
- Department of Bioengineering, McGill University, Montreal, Canada
| | - Sarah Keil
- Vesicular Trafficking and Cell Signalling Research Unit, Institute for Research in Immunology and Cancer https://ror.org/0161xgx34 (IRIC), Université de Montréal, Montréal, Canada
| | - Léa Marpeaux
- Vesicular Trafficking and Cell Signalling Research Unit, Institute for Research in Immunology and Cancer https://ror.org/0161xgx34 (IRIC), Université de Montréal, Montréal, Canada
| | - Lina Elouassouli
- Vesicular Trafficking and Cell Signalling Research Unit, Institute for Research in Immunology and Cancer https://ror.org/0161xgx34 (IRIC), Université de Montréal, Montréal, Canada
| | - Adele Khavari
- Department of Bioengineering, McGill University, Montreal, Canada
| | | | - Gregory Emery
- Vesicular Trafficking and Cell Signalling Research Unit, Institute for Research in Immunology and Cancer https://ror.org/0161xgx34 (IRIC), Université de Montréal, Montréal, Canada
- Department of Pathology and Cell Biology, Faculty of Medicine, Université de Montréal, Montréal, Canada
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Jovanovic D, Yan S, Baumgartner M. The molecular basis of the dichotomous functionality of MAP4K4 in proliferation and cell motility control in cancer. Front Oncol 2022; 12:1059513. [PMID: 36568222 PMCID: PMC9774001 DOI: 10.3389/fonc.2022.1059513] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 11/15/2022] [Indexed: 12/13/2022] Open
Abstract
The finely tuned integration of intra- and extracellular cues by components of the mitogen-activated protein kinase (MAPK) signaling pathways controls the mutually exclusive phenotypic manifestations of uncontrolled growth and tumor cell dissemination. The Ser/Thr kinase MAP4K4 is an upstream integrator of extracellular cues involved in both proliferation and cell motility control. Initially identified as an activator of the c-Jun N-terminal kinase (JNK), the discovery of diverse functions and additional effectors of MAP4K4 beyond JNK signaling has considerably broadened our understanding of this complex kinase. The implication of MAP4K4 in the regulation of cytoskeleton dynamics and cell motility provided essential insights into its role as a pro-metastatic kinase in cancer. However, the more recently revealed role of MAP4K4 as an activator of the Hippo tumor suppressor pathway has complicated the understanding of MAP4K4 as an oncogenic driver kinase. To develop a better understanding of the diverse functions of MAP4K4 and their potential significance in oncogenesis and tumor progression, we have collected and assessed the current evidence of MAP4K4 implication in molecular mechanisms that control proliferation and promote cell motility. A better understanding of these mechanisms is particularly relevant in the brain, where MAP4K4 is highly expressed and under pathological conditions either drives neuronal cell death in neurodegenerative diseases or cell dissemination in malignant tumors. We review established effectors and present novel interactors of MAP4K4, which offer mechanistic insights into MAP4K4 function and may inspire novel intervention strategies. We discuss possible implications of novel interactors in tumor growth and dissemination and evaluate potential therapeutic strategies to selectively repress pro-oncogenic functions of MAP4K4.
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Chou SZ, Chatterjee M, Pollard TD. Mechanism of actin filament branch formation by Arp2/3 complex revealed by a high-resolution cryo-EM structureof the branch junction. Proc Natl Acad Sci U S A 2022; 119:e2206722119. [PMID: 36442092 PMCID: PMC9894260 DOI: 10.1073/pnas.2206722119] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Accepted: 10/17/2022] [Indexed: 11/29/2022] Open
Abstract
We reconstructed the structure of actin filament branch junctions formed by fission yeast Arp2/3 complex at 3.5 Å resolution from images collected by electron cryo-microscopy. During specimen preparation, all of the actin subunits and Arp3 hydrolyzed their bound adenosine triphosphate (ATP) and dissociated the γ-phosphate, but Arp2 retained the γ-phosphate. Binding tightly to the side of the mother filament and nucleating the daughter filament growing as a branch requires Arp2/3 complex to undergo a dramatic conformational change where two blocks of structure rotate relative to each other about 25° to align Arp2 and Arp3 as the first two subunits in the branch. During branch formation, Arp2/3 complex acquires more than 8,000 Å2 of new buried surface, accounting for the stability of the branch. Inactive Arp2/3 complex binds only transiently to the side of an actin filament, because its conformation allows only a subset of the interactions found in the branch junction.
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Affiliation(s)
- Steven Z. Chou
- Department of Molecular Cellular and Developmental Biology, Yale University, New Haven, CT06520
| | - Moon Chatterjee
- Department of Molecular Cellular and Developmental Biology, Yale University, New Haven, CT06520
| | - Thomas D. Pollard
- Department of Molecular Cellular and Developmental Biology, Yale University, New Haven, CT06520
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT06520
- Department of Cell Biology, Yale University, New Haven, CT06520
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Tribollet V, Cerutti C, Géloën A, Berger E, De Mets R, Balland M, Courchet J, Vanacker JM, Forcet C. ERRα coordinates actin and focal adhesion dynamics. Cancer Gene Ther 2022; 29:1429-1438. [PMID: 35379907 DOI: 10.1038/s41417-022-00461-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 02/15/2022] [Accepted: 03/18/2022] [Indexed: 11/09/2022]
Abstract
Cell migration depends on the dynamic organisation of the actin cytoskeleton and assembly and disassembly of focal adhesions (FAs). However, the precise mechanisms coordinating these processes remain poorly understood. We previously identified the oestrogen-related receptor α (ERRα) as a major regulator of cell migration. Here, we show that loss of ERRα leads to abnormal accumulation of actin filaments that is associated with an increased level of inactive form of the actin-depolymerising factor cofilin. We further show that ERRα depletion decreases cell adhesion and results in defective FA formation and turnover. Interestingly, specific inhibition of the RhoA-ROCK-LIMK-cofilin pathway rescues the actin polymerisation defects resulting from ERRα silencing, but not cell adhesion. Instead, we found that MAP4K4 is a direct target of ERRα and down-regulation of its activity rescues cell adhesion and FA formation in the ERRα-depleted cells. Altogether, our results highlight a crucial role of ERRα in coordinating the dynamic of actin network and FAs through the independent regulation of the RhoA and MAP4K4 pathways.
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Affiliation(s)
- Violaine Tribollet
- Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, CNRS UMR5242, Ecole Normale Supérieure de Lyon, 69007, Lyon, France
| | - Catherine Cerutti
- Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, CNRS UMR5242, Ecole Normale Supérieure de Lyon, 69007, Lyon, France
| | - Alain Géloën
- Université de Lyon, UMR Ecologie Microbienne (LEM), CNRS 5557, INRAE 1418, Université Claude Bernard Lyon 1, VetAgro Sup, Research Team "Bacterial Opportunistic Pathogens and Environment" (BPOE), 69622, Villeurbanne, cedex, France
| | - Emmanuelle Berger
- Université de Lyon, UMR Ecologie Microbienne (LEM), CNRS 5557, INRAE 1418, Université Claude Bernard Lyon 1, VetAgro Sup, Research Team "Bacterial Opportunistic Pathogens and Environment" (BPOE), 69622, Villeurbanne, cedex, France
| | - Richard De Mets
- Mechanobiology Institute, National University of Singapore, Singapore, 117411, Singapore
| | - Martial Balland
- Laboratoire Interdisciplinaire de Physique, Grenoble Alpes University, 38402, Saint Martin d'Hères, France
| | - Julien Courchet
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, INSERM, Physiopathologie et Génétique du Neurone et du Muscle, UMR5261, U1315, Institut NeuroMyoGène, 69008, Lyon, France
| | - Jean-Marc Vanacker
- Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, CNRS UMR5242, Ecole Normale Supérieure de Lyon, 69007, Lyon, France
| | - Christelle Forcet
- Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, CNRS UMR5242, Ecole Normale Supérieure de Lyon, 69007, Lyon, France.
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Migliavacca J, Züllig B, Capdeville C, Grotzer MA, Baumgartner M. Cooperation of Striatin 3 and MAP4K4 promotes growth and tissue invasion. Commun Biol 2022; 5:795. [PMID: 35941177 PMCID: PMC9360036 DOI: 10.1038/s42003-022-03708-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 07/12/2022] [Indexed: 11/09/2022] Open
Abstract
MAP4K4 is associated with increased motility and reduced proliferation in tumor cells, but the regulation of this dichotomous functionality remained elusive. We find that MAP4K4 interacts with striatin 3 and 4 (STRN3/4) and that STRN3 and MAP4K4 exert opposing functions in Hippo signaling and clonal growth. However, depletion of either STRN3 or MAP4K4 in medulloblastoma cells reduces invasion, and loss of both proteins abrogates tumor cell growth in the cerebellar tissue. Mechanistically, STRN3 couples MAP4K4 to the protein phosphatase 2A, which inactivates growth repressing activities of MAP4K4. In parallel, STRN3 enables growth factor-induced PKCθ activation and direct phosphorylation of VASPS157 by MAP4K4, which both are necessary for efficient cell invasion. VASPS157 directed activity of MAP4K4 and STRN3 requires the CNH domain of MAP4K4, which mediates its interaction with striatins. Thus, STRN3 is a master regulator of MAP4K4 function, and disruption of its cooperation with MAP4K4 reactivates Hippo signaling and represses tissue invasion in medulloblastoma. Analysis of the MAP4K4-STRN3 cooperation in medulloblastoma reveals its opposing regulation of Hippo activation and tissue invasion in cancer.
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Affiliation(s)
- Jessica Migliavacca
- Pediatric Molecular Neuro-Oncology Research, Division of Oncology, Children's Research Center, University Children's Hospital Zürich, Zürich, Switzerland
| | - Buket Züllig
- Pediatric Molecular Neuro-Oncology Research, Division of Oncology, Children's Research Center, University Children's Hospital Zürich, Zürich, Switzerland
| | - Charles Capdeville
- Pediatric Molecular Neuro-Oncology Research, Division of Oncology, Children's Research Center, University Children's Hospital Zürich, Zürich, Switzerland
| | - Michael A Grotzer
- Division of Oncology, University Children's Hospital Zürich, Zürich, Switzerland
| | - Martin Baumgartner
- Pediatric Molecular Neuro-Oncology Research, Division of Oncology, Children's Research Center, University Children's Hospital Zürich, Zürich, Switzerland.
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王 茹, 尹 讯, 张 涛, 孙 雪, 张 春. [Establishment and Preliminary Analysis of Lung Cancer Cell Line A549 with Stable MAP4 K4 Knockdown]. SICHUAN DA XUE XUE BAO. YI XUE BAN = JOURNAL OF SICHUAN UNIVERSITY. MEDICAL SCIENCE EDITION 2022; 53:611-618. [PMID: 35871731 PMCID: PMC10409466 DOI: 10.12182/20220760503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Indexed: 06/15/2023]
Abstract
Objective To analyze the effect of knocking down MAP4 K4 expression on the proliferation and migration of cancer cells, and to explore its underlining molecular mechanisms. Methods A stable knockdown MAP4 K4 cell line was constructed and the subcellular localization of the cells was determined with immunofluorescence, cell proliferation assay and cell migration assay. In addition, the effects of down-regulated MAP4 K4 expression were analyzed by examining the difference between the proliferation and migration of cancer cells in the knockdown group and those of the control group. Results MAP4 K4 was localized in focal adhesion and cell edges in A549 cells. Stable knockdown of MAP4 K4 expression induced cancer cells to grow in clusters and arrested the progression of the cell cycle and cell migration. Further analysis found that knocking down MAP4 K4 expression in A549 cells induced the accumulation of epithelial cell marker E-cadherin, and subsequently, the down-regulation of N-cadherin, a mesenchymal cell marker, thereby disrupting the "cadherin switch" and the epithelial-mesenchymal conversion. Then, the control group and the knockdown group both received the combined treatment of cisplatin at a final concentration of 5 μmol/L and paclitaxel at a final concentration of 20 nmol/L. The stably knocked down MAP4 K4 expressing cells showed significantly enhanced toxicity of chemotherapeutic drugs to cancer cells. Conclusion The study shows that MAP4 K4 regulates the malignant phenotypes of cancer cells and chemoresistance by regulating "cadherin switch" to promote epithelial-mesenchymal transition in A549 cells.
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Affiliation(s)
- 茹 王
- 重庆医科大学 生物化学与分子生物学教研室 (重庆 400016)Department of Biochemistry and Molecular Biology, Chongqing Medical University, Chongqing 400016, China
- 重庆医科大学 分子医学与肿瘤研究中心 (重庆 400016)Molecular Medicine and Cancer Research Centre, Chongqing Medical University, Chongqing 400016, China
| | - 讯 尹
- 重庆医科大学 生物化学与分子生物学教研室 (重庆 400016)Department of Biochemistry and Molecular Biology, Chongqing Medical University, Chongqing 400016, China
- 重庆医科大学 分子医学与肿瘤研究中心 (重庆 400016)Molecular Medicine and Cancer Research Centre, Chongqing Medical University, Chongqing 400016, China
| | - 涛 张
- 重庆医科大学 生物化学与分子生物学教研室 (重庆 400016)Department of Biochemistry and Molecular Biology, Chongqing Medical University, Chongqing 400016, China
- 重庆医科大学 分子医学与肿瘤研究中心 (重庆 400016)Molecular Medicine and Cancer Research Centre, Chongqing Medical University, Chongqing 400016, China
| | - 雪花 孙
- 重庆医科大学 生物化学与分子生物学教研室 (重庆 400016)Department of Biochemistry and Molecular Biology, Chongqing Medical University, Chongqing 400016, China
- 重庆医科大学 分子医学与肿瘤研究中心 (重庆 400016)Molecular Medicine and Cancer Research Centre, Chongqing Medical University, Chongqing 400016, China
| | - 春冬 张
- 重庆医科大学 生物化学与分子生物学教研室 (重庆 400016)Department of Biochemistry and Molecular Biology, Chongqing Medical University, Chongqing 400016, China
- 重庆医科大学 分子医学与肿瘤研究中心 (重庆 400016)Molecular Medicine and Cancer Research Centre, Chongqing Medical University, Chongqing 400016, China
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7
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Narvaez-Ortiz HY, Nolen BJ. Unconcerted conformational changes in Arp2/3 complex integrate multiple activating signals to assemble functional actin networks. Curr Biol 2022; 32:975-987.e6. [PMID: 35090589 PMCID: PMC8930562 DOI: 10.1016/j.cub.2022.01.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/25/2021] [Accepted: 01/04/2022] [Indexed: 11/16/2022]
Abstract
Arp2/3 complex nucleates branched actin filaments important for processes such as DNA repair, endocytosis, and cellular motility. Multiple factors are required to activate branching nucleation by Arp2/3 complex, including a WASP family protein and a pre-existing actin filament. Activation is achieved through two major conformational changes-subunit flattening and movement into the short pitch conformation-that allow the actin-related proteins (Arps) within the complex (Arp2 and Arp3) to mimic filamentous actin subunits, thereby templating new filament assembly. Some models suggest that these changes are concerted and stimulated cooperatively by WASP and actin filaments, but how Arp2/3 complex integrates signals from multiple factors to drive switch-like activation of branching nucleation has been unknown. Here, we use biochemical assays to show that instead of a concerted mechanism, signal integration by Arp2/3 complex occurs via distinct and unconcerted conformational changes; WASP stimulates the short pitch arrangement of Arp2 and Arp3, while actin filaments trigger a different activation step. An engineered Arp2/3 complex that bypasses the need for WASP but not actin filaments in activation potently assembles isotropic actin networks but fails to assemble sustained force-producing actin networks in bead motility assays. The engineered complex, which is crosslinked into the short pitch conformation, fails to target nucleation to the surface of the bead, creating unproductive branching events that deplete unpolymerized actin and halt assembly. Together, our data demonstrate the requirement for multifactor signal integration by Arp2/3 complex and highlight the importance of both the WASP- and actin filament-mediated activation steps in the assembly of functional actin networks.
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Affiliation(s)
- Heidy Y Narvaez-Ortiz
- Department of Chemistry and Biochemistry, Institute of Molecular Biology, University of Oregon, Eugene, OR 97403, USA
| | - Brad J Nolen
- Department of Chemistry and Biochemistry, Institute of Molecular Biology, University of Oregon, Eugene, OR 97403, USA.
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8
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Abstract
Metastasis is the process of cancer cell dissemination from primary tumors to different organs being the bone the preferred site for metastatic homing of prostate cancer (PCa) cells. Prostate tumorigenesis is a multi-stage process that ultimately tends to advance to become metastatic PCa. Once PCa patients develop skeletal metastases, they eventually succumb to the disease. Therefore, it is imperative to identify essential molecular drivers of this process to develop new therapeutic alternatives for the treatment of this devastating disease. Here, we have identified MAP4K4 as a relevant gene for metastasis in PCa. Our work shows that genetic deletion of MAP4K4 or pharmacological inhibition of its encoded kinase, HGK, inhibits metastatic PCa cells migration and clonogenic properties. Hence, MAP4K4 might promote metastasis and tumor growth. Mechanistically, our results indicate that HGK depleted cells exhibit profound differences in F-actin organization, increasing cell spreading and focal adhesion stability. Additionally, HGK depleted cells fails to respond to TNF-α stimulation and chemoattractant action. Moreover, here we show that HGK upregulation in PCa samples from TCGA and other databases correlates with a poor prognosis of the disease. Hence, we suggest that it could be used as prognostic biomarker to predict the appearance of an aggressive phenotype of PCa tumors and ultimately, the appearance of metastasis. In summary, our results highlight an essential role for HGK in the dissemination of PCa cells and its potential use as prognostic biomarker.
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YAP-TEAD1 control of cytoskeleton dynamics and intracellular tension guides human pluripotent stem cell mesoderm specification. Cell Death Differ 2020; 28:1193-1207. [PMID: 33116297 PMCID: PMC8027678 DOI: 10.1038/s41418-020-00643-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 09/24/2020] [Accepted: 10/08/2020] [Indexed: 12/22/2022] Open
Abstract
The tight regulation of cytoskeleton dynamics is required for a number of cellular processes, including migration, division and differentiation. YAP–TEAD respond to cell–cell interaction and to substrate mechanics and, among their downstream effects, prompt focal adhesion (FA) gene transcription, thus contributing to FA-cytoskeleton stability. This activity is key to the definition of adult cell mechanical properties and function. Its regulation and role in pluripotent stem cells are poorly understood. Human PSCs display a sustained basal YAP-driven transcriptional activity despite they grow in very dense colonies, indicating these cells are insensitive to contact inhibition. PSC inability to perceive cell–cell interactions can be restored by tampering with Tankyrase enzyme, thus favouring AMOT inhibition of YAP function. YAP–TEAD complex is promptly inactivated when germ layers are specified, and this event is needed to adjust PSC mechanical properties in response to physiological substrate stiffness. By providing evidence that YAP–TEAD1 complex targets key genes encoding for proteins involved in cytoskeleton dynamics, we suggest that substrate mechanics can direct PSC specification by influencing cytoskeleton arrangement and intracellular tension. We propose an aberrant activation of YAP–TEAD1 axis alters PSC potency by inhibiting cytoskeleton dynamics, thus paralyzing the changes in shape requested for the acquisition of the given phenotype.
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Tsopoulidis N, Kaw S, Laketa V, Kutscheidt S, Baarlink C, Stolp B, Grosse R, Fackler OT. T cell receptor-triggered nuclear actin network formation drives CD4 + T cell effector functions. Sci Immunol 2020; 4:4/31/eaav1987. [PMID: 30610013 DOI: 10.1126/sciimmunol.aav1987] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 11/26/2018] [Indexed: 12/24/2022]
Abstract
T cell antigen receptor (TCR) signaling triggers selective cytokine expression to drive T cell proliferation and differentiation required for immune defense and surveillance. The nuclear signaling events responsible for specificity in cytokine gene expression upon T cell activation are largely unknown. Here, we uncover formation of a dynamic actin filament network in the nucleus that regulates cytokine expression for effector functions of CD4+ T lymphocytes. TCR engagement triggers the rapid and transient formation of a nuclear actin filament network via nuclear Arp2/3 complex, induced by elevated nuclear Ca2+ levels and regulated via N-Wasp and NIK. Specific interference with TCR-induced formation of nuclear actin filaments impairs production of effector cytokines and prevents generation of antigen-specific antibodies but does not interfere with immune synapse formation and cell proliferation. Ca2+-regulated actin polymerization in the nucleus allows CD4+ T cells the rapid conversion of TCR signals into effector functions required for T cell help.
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Affiliation(s)
- N Tsopoulidis
- Department of Infectious Diseases, Integrative Virology, CIID, University Hospital Heidelberg, Heidelberg, Germany.,Hartmut Hoffmann-Berling International Graduate School of Molecular and Cellular Biology (HBIGS), Heidelberg, Germany
| | - S Kaw
- Department of Infectious Diseases, Integrative Virology, CIID, University Hospital Heidelberg, Heidelberg, Germany
| | - V Laketa
- Department of Infectious Diseases, Virology, CIID, University Hospital Heidelberg, Heidelberg, Germany.,German Center for Infection Research, Partner Site Heidelberg, 69120 Heidelberg, Germany
| | - S Kutscheidt
- Department of Infectious Diseases, Integrative Virology, CIID, University Hospital Heidelberg, Heidelberg, Germany
| | - C Baarlink
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Freiburg, Freiburg, Germany
| | - B Stolp
- Department of Infectious Diseases, Integrative Virology, CIID, University Hospital Heidelberg, Heidelberg, Germany
| | - R Grosse
- Institute for Experimental and Clinical Pharmacology and Toxicology, University of Freiburg, Freiburg, Germany
| | - O T Fackler
- Department of Infectious Diseases, Integrative Virology, CIID, University Hospital Heidelberg, Heidelberg, Germany.
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Targeted genomic CRISPR-Cas9 screen identifies MAP4K4 as essential for glioblastoma invasion. Sci Rep 2019; 9:14020. [PMID: 31570734 PMCID: PMC6768851 DOI: 10.1038/s41598-019-50160-w] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Accepted: 09/02/2019] [Indexed: 01/11/2023] Open
Abstract
Among high-grade brain tumors, glioblastoma is particularly difficult to treat, in part due to its highly infiltrative nature which contributes to the malignant phenotype and high mortality in patients. In order to better understand the signaling pathways underlying glioblastoma invasion, we performed the first large-scale CRISPR-Cas9 loss of function screen specifically designed to identify genes that facilitate cell invasion. We tested 4,574 genes predicted to be involved in trafficking and motility. Using a transwell invasion assay, we discovered 33 genes essential for invasion. Of the 11 genes we selected for secondary testing using a wound healing assay, 6 demonstrated a significant decrease in migration. The strongest regulator of invasion was mitogen-activated protein kinase 4 (MAP4K4). Targeting of MAP4K4 with single guide RNAs or a MAP4K4 inhibitor reduced migration and invasion in vitro. This effect was consistent across three additional patient derived glioblastoma cell lines. Analysis of epithelial-mesenchymal transition markers in U138 cells with lack or inhibition of MAP4K4 demonstrated protein expression consistent with a non-invasive state. Importantly, MAP4K4 inhibition limited migration in a subset of human glioma organotypic slice cultures. Our results identify MAP4K4 as a novel potential therapeutic target to limit glioblastoma invasion.
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12
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Plessner M, Knerr J, Grosse R. Centrosomal Actin Assembly Is Required for Proper Mitotic Spindle Formation and Chromosome Congression. iScience 2019; 15:274-281. [PMID: 31096079 PMCID: PMC6520610 DOI: 10.1016/j.isci.2019.04.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 03/29/2019] [Accepted: 04/17/2019] [Indexed: 02/07/2023] Open
Abstract
Cytoskeletal cross talk between actin filaments and microtubules is a common mechanism governing the assembly of cellular structures, i.e., during filopodia formation or cilia organization. However, potential actin-microtubule interactions during mammalian cell divisions are less well understood. At mitotic entry, centrosomes propagate the formation of the mitotic spindle, thereby aligning individual chromosomes to the metaphase plate, a process coined chromosome congression. Here, we identify actin filament assembly spatially defined at centrosomes contemporaneously with spindle microtubules forming during prometaphase. We show that pharmacological Arp2/3 complex inhibition as well as overexpression of the Arp2/3 complex inhibitory protein Arpin decreased spindle actin. As a consequence, mitotic spindle formation is impaired, which resulted in disorganized chromosome congression and ultimately mitotic defects in non-transformed cells. Thus centrosomal Arp2/3 complex activity plays a role in the maintenance of genomic integrity during mitosis.
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Affiliation(s)
- Matthias Plessner
- Institute of Pharmacology, University of Freiburg, Albertstr. 25, 79104 Freiburg, Germany; CIBSS - Centre for Integrative Biological Signalling Studies, University of Freiburg, Schänzlestr. 18, 79104 Freiburg, Germany.
| | - Julian Knerr
- Institute of Pharmacology, University of Freiburg, Albertstr. 25, 79104 Freiburg, Germany
| | - Robert Grosse
- Institute of Pharmacology, University of Freiburg, Albertstr. 25, 79104 Freiburg, Germany; CIBSS - Centre for Integrative Biological Signalling Studies, University of Freiburg, Schänzlestr. 18, 79104 Freiburg, Germany.
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13
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Markwell SM, Ammer AG, Interval ET, Allen JL, Papenberg BW, Hames RA, Castaño JE, Schafer DA, Weed SA. Cortactin Phosphorylation by Casein Kinase 2 Regulates Actin-Related Protein 2/3 Complex Activity, Invadopodia Function, and Tumor Cell Invasion. Mol Cancer Res 2019; 17:987-1001. [PMID: 30610108 DOI: 10.1158/1541-7786.mcr-18-0391] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 09/18/2018] [Accepted: 12/12/2018] [Indexed: 12/13/2022]
Abstract
Malregulation of the actin cytoskeleton enhances tumor cell motility and invasion. The actin-binding protein cortactin facilitates branched actin network formation through activation of the actin-related protein (Arp) 2/3 complex. Increased cortactin expression due to gene amplification is observed in head and neck squamous cell carcinoma (HNSCC) and other cancers, corresponding with elevated tumor progression and poor patient outcome. Arp2/3 complex activation is responsible for driving increased migration and extracellular matrix (ECM) degradation by governing invadopodia formation and activity. Although cortactin-mediated activation of Arp2/3 complex and invadopodia regulation has been well established, signaling pathways responsible for governing cortactin binding to Arp2/3 are unknown and potentially present a new avenue for anti-invasive therapeutic targeting. Here we identify casein kinase (CK) 2α phosphorylation of cortactin as a negative regulator of Arp2/3 binding. CK2α directly phosphorylates cortactin at a conserved threonine (T24) adjacent to the canonical Arp2/3 binding motif. Phosphorylation of cortactin T24 by CK2α impairs the ability of cortactin to bind Arp2/3 and activate actin nucleation. Decreased invadopodia activity is observed in HNSCC cells with expression of CK2α phosphorylation-null cortactin mutants, shRNA-mediated CK2α knockdown, and with the CK2α inhibitor Silmitasertib. Silmitasertib inhibits HNSCC collective invasion in tumor spheroids and orthotopic tongue tumors in mice. Collectively these data suggest that CK2α-mediated cortactin phosphorylation at T24 is critical in regulating cortactin binding to Arp2/3 complex and pro-invasive activity, identifying a potential targetable mechanism for impairing HNSCC invasion. IMPLICATIONS: This study identifies a new signaling pathway that contributes to enhancing cancer cell invasion.Visual Overview: http://mcr.aacrjournals.org/content/molcanres/17/4/987/F1.large.jpg.
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Affiliation(s)
- Steven M Markwell
- Program in Cancer Cell Biology, Department of Biochemistry, West Virginia University, Morgantown, West Virginia
| | - Amanda G Ammer
- Program in Cancer Cell Biology, Department of Biochemistry, West Virginia University, Morgantown, West Virginia
| | - Erik T Interval
- Department of Otolaryngology, Head and Neck Surgery, West Virginia University, Morgantown, West Virginia
| | - Jessica L Allen
- Program in Cancer Cell Biology, Department of Biochemistry, West Virginia University, Morgantown, West Virginia
| | - Brenen W Papenberg
- Program in Cancer Cell Biology, Department of Biochemistry, West Virginia University, Morgantown, West Virginia
| | - River A Hames
- Program in Cancer Cell Biology, Department of Biochemistry, West Virginia University, Morgantown, West Virginia
| | - Johnathan E Castaño
- Department of Otolaryngology, Head and Neck Surgery, West Virginia University, Morgantown, West Virginia
| | - Dorothy A Schafer
- Department of Biology, University of Virginia, Charlottesville, Virginia
| | - Scott A Weed
- Program in Cancer Cell Biology, Department of Biochemistry, West Virginia University, Morgantown, West Virginia.
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14
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Epstein AE, Espinoza-Sanchez S, Pollard TD. Phosphorylation of Arp2 is not essential for Arp2/3 complex activity in fission yeast. Life Sci Alliance 2018; 1:e201800202. [PMID: 30456391 PMCID: PMC6238581 DOI: 10.26508/lsa.201800202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 10/12/2018] [Accepted: 10/12/2018] [Indexed: 12/23/2022] Open
Abstract
LeClaire et al presented evidence that phosphorylation of three sites on the Arp2 subunit activates the Arp2/3 complex to nucleate actin filaments. We mutated the homologous residues of Arp2 (Y198, T233, and T234) in the fission yeast genome to amino acids that preclude or mimic phosphorylation. Arp2/3 complex is essential for the viability of fission yeast, yet strains unable to phosphorylate these sites grew normally. Y198F/T233A/T234A Arp2 was only nonfunctional if GFP-tagged, as observed by LeClaire et al in Drosophila cells. Replacing both T233 and T234 with aspartic acid was lethal, suggesting that phosphorylation might be inhibitory. Nevertheless, blocking phosphorylation at these sites had the same effect as mimicking it: slowing assembly of endocytic actin patches. Mass spectrometry revealed phosphorylation at a fourth conserved Arp2 residue, Y218, but both blocking and mimicking phosphorylation of Y218 only slowed actin patch assembly slightly. Therefore, phosphorylation of Y198, T233, T234, and Y218 is not required for the activity of fission yeast Arp2/3 complex.
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Affiliation(s)
- Alexander E Epstein
- Departments of Molecular Cellular and Developmental Biology, Yale University, New Haven, CT, USA
| | - Sofia Espinoza-Sanchez
- Departments of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, USA
| | - Thomas D Pollard
- Departments of Molecular Cellular and Developmental Biology, Yale University, New Haven, CT, USA
- Departments of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, USA
- Department of Cell Biology, Yale University, New Haven, CT, USA
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15
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Kline A, Curry T, Lewellyn L. The Misshapen kinase regulates the size and stability of the germline ring canals in the Drosophila egg chamber. Dev Biol 2018; 440:99-112. [PMID: 29753016 DOI: 10.1016/j.ydbio.2018.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 04/06/2018] [Accepted: 05/08/2018] [Indexed: 11/30/2022]
Abstract
Intercellular bridges are conserved structures that allow neighboring cells to exchange cytoplasmic material; defects in intercellular bridges can lead to infertility in many organisms. Here, we use the Drosophila egg chamber to study the mechanisms that regulate intercellular bridges. Within the developing egg chamber, the germ cells (15 nurse cells and 1 oocyte) are connected to each other through intercellular bridges called ring canals, which expand over the course of oogenesis to support the transfer of materials from the nurse cells to the oocyte. The ring canals are enriched in actin and actin binding proteins, and many proteins have been identified that localize to the germline ring canals and control their expansion and stability. Here, we demonstrate a novel role for the Ste20 family kinase, Misshapen (Msn), in regulation of the size of the germline ring canals. Msn localizes to ring canals throughout most of oogenesis, and depletion of Msn led to the formation of larger ring canals. Over-expression of Msn decreased ring canal diameter, and expression of a membrane tethered form of Msn caused ring canal detachment and nurse cell fusion. Altering the levels or localization of Msn also led to changes in the actin cytoskeleton and altered the localization of E-cadherin, which suggests that Msn could be indirectly limiting ring canal size by altering the structure or dynamics of the actin cytoskeleton and/or adherens junctions.
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Affiliation(s)
- Ashley Kline
- Department of Biological Sciences, Butler University, Indianapolis, IN 46208, USA
| | - Travis Curry
- Department of Biological Sciences, Butler University, Indianapolis, IN 46208, USA
| | - Lindsay Lewellyn
- Department of Biological Sciences, Butler University, Indianapolis, IN 46208, USA.
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16
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Tripolitsioti D, Kumar KS, Neve A, Migliavacca J, Capdeville C, Rushing EJ, Ma M, Kijima N, Sharma A, Pruschy M, McComb S, Taylor MD, Grotzer MA, Baumgartner M. MAP4K4 controlled integrin β1 activation and c-Met endocytosis are associated with invasive behavior of medulloblastoma cells. Oncotarget 2018; 9:23220-23236. [PMID: 29796184 PMCID: PMC5955425 DOI: 10.18632/oncotarget.25294] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 04/08/2018] [Indexed: 02/03/2023] Open
Abstract
Local tissue infiltration of Medulloblastoma (MB) tumor cells precedes metastatic disease but little is still known about intrinsic regulation of migration and invasion in these cells. We found that MAP4K4, a pro-migratory Ser/Thr kinase, is overexpressed in 30% of primary MB tumors and that increased expression is particularly associated with the frequently metastatic SHH β subtype. MAP4K4 is a driver of migration and invasion downstream of c-Met, which is transcriptionally up-regulated in SHH MB. Consistently, depletion of MAP4K4 in MB tumor cells restricts HGF-driven matrix invasion in vitro and brain tissue infiltration ex vivo. We show that these pro-migratory functions of MAP4K4 involve the activation of the integrin β-1 adhesion receptor and are associated with increased endocytic uptake. The consequent enhanced recycling of c-Met caused by MAP4K4 results in the accumulation of activated c-Met in cytosolic vesicles, which is required for sustained signaling and downstream pathway activation. The parallel increase of c-Met and MAP4K4 expression in SHH MB could predict an increased potential of these tumors to infiltrate brain tissue and cause metastatic disease. Molecular targeting of the underlying accelerated endocytosis and receptor recycling could represent a novel approach to block pro-migratory effector functions of MAP4K4 in metastatic cancers.
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Affiliation(s)
- Dimitra Tripolitsioti
- University Children's Hospital Zürich, Department of Oncology, Children's Research Center, Zürich, Switzerland
| | - Karthiga Santhana Kumar
- University Children's Hospital Zürich, Department of Oncology, Children's Research Center, Zürich, Switzerland
| | - Anuja Neve
- University Children's Hospital Zürich, Department of Oncology, Children's Research Center, Zürich, Switzerland
| | - Jessica Migliavacca
- University Children's Hospital Zürich, Department of Oncology, Children's Research Center, Zürich, Switzerland
| | - Charles Capdeville
- University Children's Hospital Zürich, Department of Oncology, Children's Research Center, Zürich, Switzerland
| | - Elisabeth J Rushing
- Institute of Neuropathology, University Hospital Zürich, Zürich, Switzerland
| | - Min Ma
- University Children's Hospital Zürich, Department of Oncology, Children's Research Center, Zürich, Switzerland
| | - Noriyuki Kijima
- Division of Neurosurgery, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - Ashish Sharma
- Department of Radiation Oncology, University Hospital Zürich, Zürich, Switzerland
| | - Martin Pruschy
- Department of Radiation Oncology, University Hospital Zürich, Zürich, Switzerland
| | - Scott McComb
- University Children's Hospital Zürich, Department of Oncology, Children's Research Center, Zürich, Switzerland
| | - Michael D Taylor
- Division of Neurosurgery, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - Michael A Grotzer
- University Children's Hospital Zürich, Department of Oncology, Children's Research Center, Zürich, Switzerland.,University Children's Hospital Zürich, Department of Oncology, Zürich, Switzerland
| | - Martin Baumgartner
- University Children's Hospital Zürich, Department of Oncology, Children's Research Center, Zürich, Switzerland
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17
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Dow RL, Ammirati M, Bagley SW, Bhattacharya SK, Buckbinder L, Cortes C, El-Kattan AF, Ford K, Freeman GB, Guimarães CRW, Liu S, Niosi M, Skoura A, Tess D. 2-Aminopyridine-Based Mitogen-Activated Protein Kinase Kinase Kinase Kinase 4 (MAP4K4) Inhibitors: Assessment of Mechanism-Based Safety. J Med Chem 2018; 61:3114-3125. [PMID: 29570292 DOI: 10.1021/acs.jmedchem.8b00152] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Studies have linked the serine-threonine kinase MAP4K4 to the regulation of a number of biological processes and/or diseases, including diabetes, cancer, inflammation, and angiogenesis. With a majority of the members of our lead series (e.g., 1) suffering from time-dependent inhibition (TDI) of CYP3A4, we sought design avenues that would eliminate this risk. One such approach arose from the observation that carboxylic acid-based intermediates employed in our discovery efforts retained high MAP4K4 inhibitory potency and were devoid of the TDI risk. The medicinal chemistry effort that led to the discovery of this central nervous system-impaired inhibitor together with its preclinical safety profile is described.
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Affiliation(s)
- Robert L Dow
- Pfizer Worldwide Research & Development , Cambridge , Massachusetts 02139 , United States
| | - Mark Ammirati
- Pfizer Worldwide Research & Development , Groton , Connecticut 06340 , United States
| | - Scott W Bagley
- Pfizer Worldwide Research & Development , Groton , Connecticut 06340 , United States
| | - Samit K Bhattacharya
- Pfizer Worldwide Research & Development , Cambridge , Massachusetts 02139 , United States
| | - Leonard Buckbinder
- Pfizer Worldwide Research & Development , Cambridge , Massachusetts 02139 , United States
| | - Christian Cortes
- Pfizer Worldwide Research & Development , Cambridge , Massachusetts 02139 , United States
| | - Ayman F El-Kattan
- Pfizer Worldwide Research & Development , Cambridge , Massachusetts 02139 , United States
| | - Kristen Ford
- Pfizer Worldwide Research & Development , Groton , Connecticut 06340 , United States
| | - Gary B Freeman
- Pfizer Worldwide Research & Development , Cambridge , Massachusetts 02139 , United States
| | | | - Shenping Liu
- Pfizer Worldwide Research & Development , Groton , Connecticut 06340 , United States
| | - Mark Niosi
- Pfizer Worldwide Research & Development , Groton , Connecticut 06340 , United States
| | - Athanasia Skoura
- Pfizer Worldwide Research & Development , Cambridge , Massachusetts 02139 , United States
| | - David Tess
- Pfizer Worldwide Research & Development , Cambridge , Massachusetts 02139 , United States
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18
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Wang JC, Lee JYJ, Dang-Lawson M, Pritchard C, Gold MR. The Rap2c GTPase facilitates B cell receptor-induced reorientation of the microtubule-organizing center. Small GTPases 2018; 11:402-412. [PMID: 29457987 DOI: 10.1080/21541248.2018.1441626] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
When B lymphocytes encounter antigen-bearing surfaces, B-cell receptor (BCR) signaling initiates remodeling of the F-actin network and reorientation of the microtubule-organizing center (MTOC) towards the antigen contact site. We have previously shown that the Rap1 GTPase, an evolutionarily conserved regulator of cell polarity, is essential for these processes and that Rap1-regulated actin remodeling is required for MTOC polarization. The role of Rap2 proteins in establishing cell polarity is not well understood. We now show that depleting Rap2c, the only Rap2 isoform expressed in the A20 B-cell line, impairs BCR-induced MTOC reorientation as well as the actin remodeling that supports MTOC polarization. Thus Rap1 and Rap2 proteins may have similar but non-redundant functions in coupling the BCR to MTOC polarization.
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Affiliation(s)
- Jia C Wang
- Department of Microbiology & Immunology and the Life Sciences Institute, University of British Columbia , Vancouver, BC, Canada
| | - Jeff Y-J Lee
- Department of Microbiology & Immunology and the Life Sciences Institute, University of British Columbia , Vancouver, BC, Canada
| | - May Dang-Lawson
- Department of Microbiology & Immunology and the Life Sciences Institute, University of British Columbia , Vancouver, BC, Canada
| | - Caitlin Pritchard
- Department of Microbiology & Immunology and the Life Sciences Institute, University of British Columbia , Vancouver, BC, Canada
| | - Michael R Gold
- Department of Microbiology & Immunology and the Life Sciences Institute, University of British Columbia , Vancouver, BC, Canada
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19
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Schlau M, Terheyden-Keighley D, Theis V, Mannherz HG, Theiss C. VEGF Triggers the Activation of Cofilin and the Arp2/3 Complex within the Growth Cone. Int J Mol Sci 2018; 19:ijms19020384. [PMID: 29382077 PMCID: PMC5855606 DOI: 10.3390/ijms19020384] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 01/16/2018] [Accepted: 01/24/2018] [Indexed: 01/05/2023] Open
Abstract
A crucial neuronal structure for the development and regeneration of neuronal networks is the axonal growth cone. Affected by different guidance cues, it grows in a predetermined direction to reach its final destination. One of those cues is the vascular endothelial growth factor (VEGF), which was identified as a positive effector for growth cone movement. These positive effects are mainly mediated by a reorganization of the actin network. This study shows that VEGF triggers a tight colocalization of cofilin and the Arp2/3 complex to the actin cytoskeleton within chicken dorsal root ganglia (DRG). Live cell imaging after microinjection of GFP (green fluorescent protein)-cofilin and RFP (red fluorescent protein)-LifeAct revealed that both labeled proteins rapidly redistributed within growth cones, and showed a congruent distribution pattern after VEGF supplementation. Disruption of signaling upstream of cofilin via blocking LIM-kinase (LIMK) activity resulted in growth cones displaying regressive growth behavior. Microinjection of GFP-p16b (a subunit of the Arp2/3 complex) and RFP-LifeAct revealed that both proteins redistributed into lamellipodia of the growth cone within minutes after VEGF stimulation. Disruption of the signaling to the Arp2/3 complex in the presence of VEGF by inhibition of N-WASP (neuronal Wiskott–Aldrich–Scott protein) caused retraction of growth cones. Hence, cofilin and the Arp2/3 complex appear to be downstream effector proteins of VEGF signaling to the actin cytoskeleton of DRG growth cones. Our data suggest that VEGF simultaneously affects different pathways for signaling to the actin cytoskeleton, since activation of cofilin occurs via inhibition of LIMK, whereas activation of Arp2/3 is achieved by stimulation of N-WASP.
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Affiliation(s)
- Matthias Schlau
- Institute of Anatomy, Department of Cytology, Ruhr-University Bochum, Universitätsstraße 150, 44780 Bochum, Germany.
| | - Daniel Terheyden-Keighley
- Institute of Anatomy, Department of Cytology, Ruhr-University Bochum, Universitätsstraße 150, 44780 Bochum, Germany.
| | - Verena Theis
- Institute of Anatomy, Department of Cytology, Ruhr-University Bochum, Universitätsstraße 150, 44780 Bochum, Germany.
| | - Hans Georg Mannherz
- Research Group Molecular Cardiology, University Hospital Bergmannsheil and St. Josef Hospital, c/o Clinical Pharmacology, Ruhr-University, 44780 Bochum, Germany.
| | - Carsten Theiss
- Institute of Anatomy, Department of Cytology, Ruhr-University Bochum, Universitätsstraße 150, 44780 Bochum, Germany.
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20
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Loh JT, Su IH. Post-translational modification-regulated leukocyte adhesion and migration. Oncotarget 2018; 7:37347-37360. [PMID: 26993608 PMCID: PMC5095081 DOI: 10.18632/oncotarget.8135] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 02/28/2016] [Indexed: 12/30/2022] Open
Abstract
Leukocytes undergo frequent phenotypic changes and rapidly infiltrate peripheral and lymphoid tissues in order to carry out immune responses. The recruitment of circulating leukocytes into inflamed tissues depends on integrin-mediated tethering and rolling of these cells on the vascular endothelium, followed by transmigration into the tissues. This dynamic process of migration requires the coordination of large numbers of cytosolic and transmembrane proteins whose functional activities are typically regulated by post-translational modifications (PTMs). Our recent studies have shown that the lysine methyltransferase, Ezh2, critically regulates integrin signalling and governs the adhesion dynamics of leukocytes via direct methylation of talin, a key molecule that controls these processes by linking integrins to the actin cytoskeleton. In this review, we will discuss the various modes of leukocyte migration and examine how PTMs of cytoskeletal/adhesion associated proteins play fundamental roles in the dynamic regulation of leukocyte migration. Furthermore, we will discuss molecular details of the adhesion dynamics controlled by Ezh2-mediated talin methylation and the potential implications of this novel regulatory mechanism for leukocyte migration, immune responses, and pathogenic processes, such as allergic contact dermatitis and tumorigenesis.
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Affiliation(s)
- Jia Tong Loh
- School of Biological Sciences, College of Science, Nanyang Technological University, Republic of Singapore
| | - I-Hsin Su
- School of Biological Sciences, College of Science, Nanyang Technological University, Republic of Singapore
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21
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Molinie N, Gautreau A. The Arp2/3 Regulatory System and Its Deregulation in Cancer. Physiol Rev 2017; 98:215-238. [PMID: 29212790 DOI: 10.1152/physrev.00006.2017] [Citation(s) in RCA: 119] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 05/10/2017] [Accepted: 05/11/2017] [Indexed: 02/07/2023] Open
Abstract
The Arp2/3 complex is an evolutionary conserved molecular machine that generates branched actin networks. When activated, the Arp2/3 complex contributes the actin branched junction and thus cross-links the polymerizing actin filaments in a network that exerts a pushing force. The different activators initiate branched actin networks at the cytosolic surface of different cellular membranes to promote their protrusion, movement, or scission in cell migration and membrane traffic. Here we review the structure, function, and regulation of all the direct regulators of the Arp2/3 complex that induce or inhibit the initiation of a branched actin network and that controls the stability of its branched junctions. Our goal is to present recent findings concerning novel inhibitory proteins or the regulation of the actin branched junction and place these in the context of what was previously known to provide a global overview of how the Arp2/3 complex is regulated in human cells. We focus on the human set of Arp2/3 regulators to compare normal Arp2/3 regulation in untransformed cells to the deregulation of the Arp2/3 system observed in patients affected by various cancers. In many cases, these deregulations promote cancer progression and have a direct impact on patient survival.
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Affiliation(s)
- Nicolas Molinie
- Ecole Polytechnique, Université Paris-Saclay, CNRS UMR 7654, Palaiseau, France; and Moscow Institute of Physics and Technology, Life Sciences Center, Dolgoprudny, Russia
| | - Alexis Gautreau
- Ecole Polytechnique, Université Paris-Saclay, CNRS UMR 7654, Palaiseau, France; and Moscow Institute of Physics and Technology, Life Sciences Center, Dolgoprudny, Russia
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22
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Michard C, LeClaire LL, Doublet P. ARP2/3 Phosphorylation Assay in the Presence of Recombinant Bacterial Effectors. Bio Protoc 2017; 7:e2208. [PMID: 34541216 DOI: 10.21769/bioprotoc.2208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 01/05/2017] [Accepted: 03/06/2017] [Indexed: 11/02/2022] Open
Abstract
The Actin-Related Protein 2/3 (ARP2/3) complex is an actin nucleator that generates a branched actin network in mammalian cells. In addition to binding nucleation promoting factors, LeClaire et al. demonstrated that its phosphorylation state is essential key for its activity ( LeClaire et al., 2008 ). In cells, the ARP2/3 complex is phosphorylated on threonine and tyrosine residues of the ARP2, ARP3, and ARPC1 subunits ( Vadlamudi et al., 2004 ; LeClaire et al., 2008 ; Narayanan et al., 2011 ; LeClaire et al., 2015 ). In particular, phosphorylation of threonine 237 and 238 of the ARP2 subunit is necessary to allow a change in the ARP2/3 complex structure to its active conformation ( Narayanan et al., 2011 ; LeClaire et al., 2015 ). While important for many functions in eukaryotic cells, ARP2/3 complex activity also benefits several cellular pathogens (Haglund and Welch, 2011; Welch and Way, 2013). Recently, we demonstrated that the bacterial pathogen, Legionella pneumophila, manipulates ARP2/3 complex phosphorylation state using a bacterial protein kinase injected in host cell cytoplasm ( Michard et al., 2015 ). Here, we describe how to test the ability of a bacterial protein kinase or another protein kinase to phosphorylate the ARP2/3 complex in an in vitro context. First, the ARP2/3 complex and the bacterial protein kinase are produced and purified. Then, the purified proteins are incubated in the presence of ATP, and the ARP2/3 phosphorylation level is analyzed by Western blot.
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Affiliation(s)
- Céline Michard
- International Centre for Infectiology Research (CIRI), Legionella pathogenesis group, Université de Lyon, Lyon, France.,Institut national de la santé et de la recherche médicale (INSERM), Lyon, France.,Ecole Normale Supérieure de Lyon, Lyon, France.,Université Lyon 1, Centre International de Recherche en Infectiologie, Lyon, France.,Centre national de la recherche scientifique (CNRS), Lyon, France
| | - Lawrence L LeClaire
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile, USA
| | - Patricia Doublet
- International Centre for Infectiology Research (CIRI), Legionella pathogenesis group, Université de Lyon, Lyon, France.,Institut national de la santé et de la recherche médicale (INSERM), Lyon, France.,Ecole Normale Supérieure de Lyon, Lyon, France.,Université Lyon 1, Centre International de Recherche en Infectiologie, Lyon, France.,Centre national de la recherche scientifique (CNRS), Lyon, France
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23
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Plk4 Promotes Cancer Invasion and Metastasis through Arp2/3 Complex Regulation of the Actin Cytoskeleton. Cancer Res 2016; 77:434-447. [DOI: 10.1158/0008-5472.can-16-2060] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 10/07/2016] [Accepted: 11/08/2016] [Indexed: 11/16/2022]
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24
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Häupl B, Ihling CH, Sinz A. Protein Interaction Network of Human Protein Kinase D2 Revealed by Chemical Cross-Linking/Mass Spectrometry. J Proteome Res 2016; 15:3686-3699. [PMID: 27559607 DOI: 10.1021/acs.jproteome.6b00513] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We investigated the interaction network of human PKD2 in the cytosol and in Golgi-enriched subcellular protein fractions by an affinity enrichment strategy combined with chemical cross-linking/mass spectrometry (MS). Analysis of the subproteomes revealed the presence of distinct proteins in the cytosolic and Golgi fractions. The covalent fixation of transient or weak interactors by chemical cross-linking allowed capturing interaction partners that might otherwise disappear during conventional pull-down experiments. In total, 31 interaction partners were identified for PKD2, including glycogen synthase kinase-3 beta (GSK3B), 14-3-3 protein gamma (YWHAG), and the alpha isoform of 55 kDa regulatory subunit B of protein phosphatase 2A (PPP2R2A). Remarkably, the entire seven-subunit Arp2/3 complex (ARPC1B, ARPC2, ARPC3, ARPC4, ARPC5, ACTR3, ACTR2) as well as ARPC1A and ARPC5L, which are putative substitutes of ARPC1B and ARPC5, were identified. We provide evidence of a direct protein-protein interaction between PKD2 and Arp2/3. Our findings will pave the way for further structural and functional studies of PKD2 complexes, especially the PKD2/Arp2/3 interaction, to elucidate the role of PKD2 for transport processes at the trans-Golgi network. Data are available via ProteomeXchange with identifiers PXD003909 (enrichment from cytosolic fractions), PXD003913 (enrichment from Golgi fractions), and PXD003917 (subcellular fractionation).
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Affiliation(s)
- Björn Häupl
- Department of Pharmaceutical Chemistry & Bioanalytics, Institute of Pharmacy, Martin Luther University Halle-Wittenberg , Wolfgang-Langenbeck-Str. 4, D-06120 Halle (Saale), Germany
| | - Christian H Ihling
- Department of Pharmaceutical Chemistry & Bioanalytics, Institute of Pharmacy, Martin Luther University Halle-Wittenberg , Wolfgang-Langenbeck-Str. 4, D-06120 Halle (Saale), Germany
| | - Andrea Sinz
- Department of Pharmaceutical Chemistry & Bioanalytics, Institute of Pharmacy, Martin Luther University Halle-Wittenberg , Wolfgang-Langenbeck-Str. 4, D-06120 Halle (Saale), Germany
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25
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Virbasius JV, Czech MP. Map4k4 Signaling Nodes in Metabolic and Cardiovascular Diseases. Trends Endocrinol Metab 2016; 27:484-492. [PMID: 27160798 PMCID: PMC4912878 DOI: 10.1016/j.tem.2016.04.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 04/12/2016] [Accepted: 04/12/2016] [Indexed: 12/25/2022]
Abstract
Mitogen-activated kinase kinase kinase kinase 4 (Map4k4), originally identified in small interfering (si)RNA screens and characterized by tissue-specific gene deletions, is emerging as a regulator of glucose homeostasis and cardiovascular health. Recent studies have shown that Map4k4 gene ablation or inhibition of its kinase activity attenuates hyperglycemia and plaque formation in mouse models of insulin resistance and atherosclerosis, and suggest roles for Map4k4 in multiple signaling systems, including NFκB activation, small GTPase regulation, the Hippo cascade, and regulation of cell dynamics by FERM domain proteins. This new and promising area of inquiry raises key questions that need to be addressed, such as defining which of the above or other effectors mediate Map4k4 control of metabolic and vascular functions, and identifying upstream activators of Map4k4.
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Affiliation(s)
- Joseph V Virbasius
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Michael P Czech
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA.
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Gadila SKG, Kim K. Cargo trafficking from the trans-Golgi network towards the endosome. Biol Cell 2016; 108:205-18. [DOI: 10.1111/boc.201600001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 03/30/2016] [Accepted: 03/31/2016] [Indexed: 11/28/2022]
Affiliation(s)
| | - Kyoungtae Kim
- Department of Biology; Missouri State University; Springfield MO 65807 USA
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27
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Schwaid AG, Su C, Loos P, Wu J, Nguyen C, Stone KL, Kanyo J, Geoghegan KF, Bhattacharya SK, Dow RL, Buckbinder L, Carpino PA. MAP4K4 Is a Threonine Kinase That Phosphorylates FARP1. ACS Chem Biol 2015; 10:2667-71. [PMID: 26422651 DOI: 10.1021/acschembio.5b00679] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Mitogen-activated protein kinase 4 (MAP4K4) regulates the MEK kinase cascade and is implicated in cytoskeletal rearrangement and migration; however, identifying MAP4K4 substrates has remained a challenge. To ascertain MAP4K4-dependent phosphorylation events, we combined phosphoproteomic studies of MAP4K4 inhibition with in vitro assessment of its kinase specificity. We identified 235 phosphosites affected by MAP4K4 inhibition in cells and found that pTP and pSP motifs were predominant among them. In contrast, in vitro assessment of kinase specificity showed that MAP4K4 favors a pTL motif. We showed that MAP4K4 directly phosphorylates and coimmunoprecipitates with FERM, RhoGEF, and pleckstrin domain-containing protein 1 (FARP1). MAP4K4 inhibition in SH-SY5Y cells increases neurite outgrowth, a process known to involve FARP1. As FARP1 and MAP4K4 both contribute to cytoskeletal rearrangement, the results suggest that MAP4K4 exerts some of its effects on the cytoskeleton via phosphorylation of FARP1.
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Affiliation(s)
| | | | | | - Jiang Wu
- Structural
Biology and Biophysics, Center for Chemistry Innovation and Excellence, Pfizer Pharmatherapeutics Research and Development, Groton, Connecticut 06340, United States
| | - Chuong Nguyen
- Structural
Biology and Biophysics, Center for Chemistry Innovation and Excellence, Pfizer Pharmatherapeutics Research and Development, Groton, Connecticut 06340, United States
| | - Kathryn L. Stone
- W.M.
Keck Foundation Biotechnology Resource Laboratory, Yale University, New Haven, Connecticut 06520, United States
| | - Jean Kanyo
- W.M.
Keck Foundation Biotechnology Resource Laboratory, Yale University, New Haven, Connecticut 06520, United States
| | - Kieran F. Geoghegan
- Structural
Biology and Biophysics, Center for Chemistry Innovation and Excellence, Pfizer Pharmatherapeutics Research and Development, Groton, Connecticut 06340, United States
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Leslie M. NIK flips the switch on Arp2/3. J Biophys Biochem Cytol 2015. [PMCID: PMC4298686 DOI: 10.1083/jcb.2082iti1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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