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Venugopal S, Dan Q, Sri Theivakadadcham VS, Wu B, Kofler M, Layne MD, Connelly KA, Rzepka MF, Friedberg MK, Kapus A, Szászi K. Regulation of the RhoA exchange factor GEF-H1 by profibrotic stimuli through a positive feedback loop involving RhoA, MRTF, and Sp1. Am J Physiol Cell Physiol 2024; 327:C387-C402. [PMID: 38912734 DOI: 10.1152/ajpcell.00088.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 06/03/2024] [Accepted: 06/14/2024] [Indexed: 06/25/2024]
Abstract
RhoA and its effectors, the transcriptional coactivators myocardin-related transcription factor (MRTF) and serum response factor (SRF), control epithelial phenotype and are indispensable for profibrotic epithelial reprogramming during fibrogenesis. Context-dependent control of RhoA and fibrosis-associated changes in its regulators, however, remain incompletely characterized. We previously identified the guanine nucleotide exchange factor GEF-H1 as a central mediator of RhoA activation in renal tubular cells exposed to inflammatory or fibrotic stimuli. Here we found that GEF-H1 expression and phosphorylation were strongly elevated in two animal models of fibrosis. In the Unilateral Ureteral Obstruction mouse kidney fibrosis model, GEF-H1 was upregulated predominantly in the tubular compartment. GEF-H1 was also elevated and phosphorylated in a rat pulmonary artery banding (PAB) model of right ventricular fibrosis. Prolonged stimulation of LLC-PK1 tubular cells with tumor necrosis factor (TNF)-α or transforming growth factor (TGF)-β1 increased GEF-H1 expression and activated a luciferase-coupled GEF-H1 promoter. Knockdown and overexpression studies revealed that these effects were mediated by RhoA, cytoskeleton remodeling, and MRTF, indicative of a positive feedback cycle. Indeed, silencing endogenous GEF-H1 attenuated activation of the GEF-H1 promoter. Of importance, inhibition of MRTF using CCG-1423 prevented GEF-H1 upregulation in both animal models. MRTF-dependent increase in GEF-H1 was prevented by inhibition of the transcription factor Sp1, and mutating putative Sp1 binding sites in the GEF-H1 promoter eliminated its MRTF-dependent activation. As the GEF-H1/RhoA axis is key for fibrogenesis, this novel MRTF/Sp1-dependent regulation of GEF-H1 abundance represents a potential target for reducing renal and cardiac fibrosis.NEW & NOTEWORTHY We show that expression of the RhoA regulator GEF-H1 is upregulated in tubular cells exposed to fibrogenic cytokines and in animal models of kidney and heart fibrosis. We identify a pathway wherein GEF-H1/RhoA-dependent MRTF activation through its noncanonical partner Sp1 upregulates GEF-H1. Our data reveal the existence of a positive feedback cycle that enhances Rho signaling through control of both GEF-H1 activation and expression. This feedback loop may play an important role in organ fibrosis.
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Affiliation(s)
- Shruthi Venugopal
- Keenan Research Centre for Biomedical Science of the St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
| | - Qinghong Dan
- Keenan Research Centre for Biomedical Science of the St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
| | - Veroni S Sri Theivakadadcham
- Keenan Research Centre for Biomedical Science of the St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
| | - Brian Wu
- Keenan Research Centre for Biomedical Science of the St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
| | - Michael Kofler
- Keenan Research Centre for Biomedical Science of the St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
| | - Matthew D Layne
- Department of Biochemistry & Cell Biology, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts, United States
| | - Kim A Connelly
- Keenan Research Centre for Biomedical Science of the St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
| | - Mark F Rzepka
- Department of Physiology, University of Toronto, Toronto, Ontario, Canada
| | - Mark K Friedberg
- Division of Cardiology, Labatt Family Heart Center Toronto, Hospital for Sick Children, Toronto, Ontario, Canada
- Translational Medicine, Hospital for Sick Children Research Institute and University of Toronto, Toronto, Ontario, Canada
| | - András Kapus
- Keenan Research Centre for Biomedical Science of the St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
- Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Katalin Szászi
- Keenan Research Centre for Biomedical Science of the St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
- Department of Surgery, University of Toronto, Toronto, Ontario, Canada
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2
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Morel A, Douat C, Blangy A, Vives V. Bone resorption by osteoclasts involves fine tuning of RHOA activity by its microtubule-associated exchange factor GEF-H1. Front Physiol 2024; 15:1342024. [PMID: 38312316 PMCID: PMC10834693 DOI: 10.3389/fphys.2024.1342024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 01/08/2024] [Indexed: 02/06/2024] Open
Abstract
Bone health is controlled by the balance between bone formation by osteoblasts and degradation by osteoclasts. A disequilibrium in favor of bone resorption leads to osteolytic diseases characterized by decreased bone density. Osteoclastic resorption is dependent on the assembly of an adhesion structure: the actin ring, also called podosome belt or sealing zone, which is composed of a unique patterning of podosomes stabilized by microtubules. A better understanding of the molecular mechanisms regulating the crosstalk between actin cytoskeleton and microtubules network is key to find new treatments to inhibit bone resorption. Evidence points to the importance of the fine tuning of the activity of the small GTPase RHOA for the formation and maintenance of the actin ring, but the underlying mechanism is not known. We report here that actin ring disorganization upon microtubule depolymerization is mediated by the activation of the RHOA-ROCK signaling pathway. We next show the involvement of GEF-H1, one of RHOA guanine exchange factor highly expressed in osteoclasts, which has the particularity of being negatively regulated by sequestration on microtubules. Using a CRISPR/Cas9-mediated GEF-H1 knock-down osteoclast model, we demonstrate that RHOA activation upon microtubule depolymerization is mediated by GEF-H1 release. Interestingly, although lower levels of GEF-H1 did not impact sealing zone formation in the presence of an intact microtubule network, sealing zone was smaller leading to impaired resorption. Altogether, these results suggest that a fine tuning of GEF-H1 through its association with microtubules, and consequently of RHOA activity, is essential for osteoclast sealing zone stability and resorption function.
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Affiliation(s)
- Anne Morel
- CRBM (Montpellier cell Biology Research Center), Univ Montpellier, CNRS (National Center for Scientific Research), Montpellier, France
| | - Christophe Douat
- CRBM (Montpellier cell Biology Research Center), Univ Montpellier, CNRS (National Center for Scientific Research), Montpellier, France
| | - Anne Blangy
- CRBM (Montpellier cell Biology Research Center), Univ Montpellier, CNRS (National Center for Scientific Research), Montpellier, France
| | - Virginie Vives
- CRBM (Montpellier cell Biology Research Center), Univ Montpellier, CNRS (National Center for Scientific Research), Montpellier, France
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3
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Olivier JF, Langlais D, Jeyakumar T, Polyak MJ, Galarneau L, Cayrol R, Jiang H, Molloy KR, Xu G, Suzuki H, LaCava J, Gros P, Fodil N. CCDC88B interacts with RASAL3 and ARHGEF2 and regulates dendritic cell function in neuroinflammation and colitis. Commun Biol 2024; 7:77. [PMID: 38200184 PMCID: PMC10781698 DOI: 10.1038/s42003-023-05751-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 12/28/2023] [Indexed: 01/12/2024] Open
Abstract
CCDC88B is a risk factor for several chronic inflammatory diseases in humans and its inactivation causes a migratory defect in DCs in mice. CCDC88B belongs to a family of cytoskeleton-associated scaffold proteins that feature protein:protein interaction domains. Here, we identified the Rho/Rac Guanine Nucleotide Exchange Factor 2 (ARHGEF2) and the RAS Protein Activator Like 3 (RASAL3) as CCDC88B physical and functional interactors. Mice defective in Arhgef2 or Rasal3 show dampened neuroinflammation, and display altered cellular response and susceptibility to colitis; ARHGEF2 maps to a human Chromosome 1 locus associated with susceptibility to IBD. Arhgef2 and Rasal3 mutant DCs show altered migration and motility in vitro, causing either reduced (Arhgef2) or enhanced (Rasal3) migratory properties. The CCDC88B/RASAL3/ARHGEF2 complex appears to regulate DCs migration by modulating activation of RHOA, with ARHGEF2 and RASAL3 acting in opposite regulatory fashions, providing a molecular mechanism for the involvement of these proteins in DCs immune functions.
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Affiliation(s)
- Jean-Frederic Olivier
- Department of Biochemistry, McGill University, Montreal, QC, Canada
- McGill Research Center on Complex Traits, Montreal, QC, Canada
| | - David Langlais
- McGill Research Center on Complex Traits, Montreal, QC, Canada
- Department of Human Genetics, Victor Phillip Dahdaleh Institute of Genomic Medicine, Montreal, QC, Canada
| | - Thiviya Jeyakumar
- Department of Biochemistry, McGill University, Montreal, QC, Canada
- McGill Research Center on Complex Traits, Montreal, QC, Canada
| | - Maria J Polyak
- Department of Biochemistry, McGill University, Montreal, QC, Canada
- McGill Research Center on Complex Traits, Montreal, QC, Canada
| | - Luc Galarneau
- Department of Medicine, Sherbrooke University, Sherbrooke, QC, Canada
| | - Romain Cayrol
- Department of Pathology, University of Montreal Hospital Center (CHUM), Montreal, QC, Canada
- University of Montreal Hospital Center Research Center (CR-CHUM), Montreal, QC, Canada
- Department of Pathology and Cellular Biology, University of Montreal, Montreal, QC, Canada
| | - Hua Jiang
- Laboratory of Cellular and Structural Biology, The Rockefeller University, New York, NY, USA
| | - Kelly R Molloy
- Laboratory of Mass Spectrometry and Gaseous Ion Chemistry, The Rockefeller University, New York, NY, USA
| | - Guoyue Xu
- Department of Human Genetics, Victor Phillip Dahdaleh Institute of Genomic Medicine, Montreal, QC, Canada
| | - Harumi Suzuki
- Department of Immunology and Pathology, National Center for Global Health and Medicine, Tokyo, Japan
| | - John LaCava
- Laboratory of Cellular and Structural Biology, The Rockefeller University, New York, NY, USA
- European Research Institute for the Biology of Ageing, University Medical Center Groningen, Groningen, The Netherlands
| | - Philippe Gros
- Department of Biochemistry, McGill University, Montreal, QC, Canada.
- McGill Research Center on Complex Traits, Montreal, QC, Canada.
| | - Nassima Fodil
- McGill Research Center on Complex Traits, Montreal, QC, Canada
- CERMO-FC, Pavillon des Sciences Biologiques, Montreal, QC, Canada
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Coló GP, Seiwert A, Haga RB. Lfc subcellular localization and activity is controlled by αv-class integrin. J Cell Sci 2023; 136:307374. [PMID: 37129180 DOI: 10.1242/jcs.260740] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 03/31/2023] [Indexed: 05/03/2023] Open
Abstract
Fibronectin (FN)-binding integrins control a variety of cellular responses through Rho GTPases. The FN-binding integrins, αvβ3 and α5β1, are known to induce different effects on cell morphology and motility. Here, we report that FN-bound αvβ3 integrin, but not FN-bound α5β1 integrin, triggers the dissociation of the RhoA GEF Lfc (also known as GEF-H1 and ARHGEF2 in humans) from microtubules (MTs), leading to the activation of RhoA, formation of stress fibres and maturation of focal adhesions (FAs). Conversely, loss of Lfc expression decreases RhoA activity, stress fibre formation and FA size, suggesting that Lfc is the major GEF downstream of FN-bound αvβ3 that controls RhoA activity. Mechanistically, FN-engaged αvβ3 integrin activates a kinase cascade involving MARK2 and MARK3, which in turn leads to phosphorylation of several phospho-sites on Lfc. In particular, S151 was identified as the main site involved in the regulation of Lfc localization and activity. Our findings indicate that activation of Lfc and RhoA is orchestrated in FN-adherent cells in an integrin-specific manner.
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Affiliation(s)
- Georgina P Coló
- Department of Molecular Medicine, Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152, Martinsried, Germany
| | - Andrea Seiwert
- Department of Molecular Medicine, Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152, Martinsried, Germany
| | - Raquel B Haga
- Department of Molecular Medicine, Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152, Martinsried, Germany
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5
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Law RA, Kiepas A, Desta HE, Perez Ipiña E, Parlani M, Lee SJ, Yankaskas CL, Zhao R, Mistriotis P, Wang N, Gu Z, Kalab P, Friedl P, Camley BA, Konstantopoulos K. Cytokinesis machinery promotes cell dissociation from collectively migrating strands in confinement. SCIENCE ADVANCES 2023; 9:eabq6480. [PMID: 36630496 PMCID: PMC9833664 DOI: 10.1126/sciadv.abq6480] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Cells tune adherens junction dynamics to regulate epithelial integrity in diverse (patho)physiological processes, including cancer metastasis. We hypothesized that the spatially confining architecture of peritumor stroma promotes metastatic cell dissemination by remodeling cell-cell adhesive interactions. By combining microfluidics with live-cell imaging, FLIM/FRET biosensors, and optogenetic tools, we show that confinement induces leader cell dissociation from cohesive ensembles. Cell dissociation is triggered by myosin IIA (MIIA) dismantling of E-cadherin cell-cell junctions, as recapitulated by a mathematical model. Elevated MIIA contractility is controlled by RhoA/ROCK activation, which requires distinct guanine nucleotide exchange factors (GEFs). Confinement activates RhoA via nucleocytoplasmic shuttling of the cytokinesis-regulatory proteins RacGAP1 and Ect2 and increased microtubule dynamics, which results in the release of active GEF-H1. Thus, confining microenvironments are sufficient to induce cell dissemination from primary tumors by remodeling E-cadherin cell junctions via the interplay of microtubules, nuclear trafficking, and RhoA/ROCK/MIIA pathway and not by down-regulating E-cadherin expression.
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Affiliation(s)
- Robert A. Law
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Alexander Kiepas
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Habben E. Desta
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Emiliano Perez Ipiña
- William H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Maria Parlani
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Se Jong Lee
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Christopher L. Yankaskas
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Runchen Zhao
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Panagiotis Mistriotis
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
- Department of Chemical Engineering, Auburn University, Auburn, AL 36849, USA
| | - Nianchao Wang
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Zhizhan Gu
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
- Corresponding author. (K.K.); (Z.G.)
| | - Petr Kalab
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Peter Friedl
- Department of Genitourinary Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, Netherlands
- Cancer Genomics Center, 3584 Utrecht, Netherlands
| | - Brian A. Camley
- William H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
- Department of Biophysics, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Konstantinos Konstantopoulos
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Johns Hopkins Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Department of Oncology, Johns Hopkins University, Baltimore, MD 21205, USA
- Corresponding author. (K.K.); (Z.G.)
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6
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Differential roles and regulation of the protein kinases PAK4, PAK5 and PAK6 in melanoma cells. Biochem J 2022; 479:1709-1725. [PMID: 35969127 PMCID: PMC9444074 DOI: 10.1042/bcj20220184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 07/30/2022] [Accepted: 08/12/2022] [Indexed: 11/26/2022]
Abstract
The protein kinases PAK4, PAK5 and PAK6 comprise a family of ohnologues. In multiple cancers including melanomas PAK5 most frequently carries non-synonymous mutations; PAK6 and PAK4 have fewer; and PAK4 is often amplified. To help interpret these genomic data, initially we compared the cellular regulation of the sister kinases and their roles in melanoma cells. In common with many ohnologue protein kinases, PAK4, PAK5 and PAK6 each have two 14-3-3-binding phosphosites of which phosphoSer99 is conserved. PAK4 localises to the leading edge of cells in response to phorbol ester-stimulated binding of 14-3-3 to phosphoSer99 and phosphoSer181, which are phosphorylated by two different PKCs or PKDs. These phosphorylations of PAK4 are essential for its phorbol ester-stimulated phosphorylation of downstream substrates. In contrast, 14-3-3 interacts with PAK5 in response to phorbol ester-stimulated phosphorylation of Ser99 and epidermal growth factor-stimulated phosphorylation of Ser288; whereas PAK6 docks onto 14-3-3 and is prevented from localising to cell–cell junctions when Ser133 is phosphorylated in response to cAMP-elevating agents via PKA and insulin-like growth factor 1 via PKB/Akt. Silencing of PAK4 impairs viability, migration and invasive behaviour of melanoma cells carrying BRAFV600E or NRASQ61K mutations. These defects are rescued by ectopic expression of PAK4, more so by a 14-3-3-binding deficient PAK4, and barely by PAK5 or PAK6. Together these genomic, biochemical and cellular data suggest that the oncogenic properties of PAK4 are regulated by PKC–PKD signalling in melanoma, while PAK5 and PAK6 are dispensable in this cancer.
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7
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García-Jiménez I, Cervantes-Villagrana RD, Del-Río-Robles JE, Castillo-Kauil A, Beltrán-Navarro YM, García-Román J, Reyes-Cruz G, Vázquez-Prado J. Gβγ mediates activation of Rho guanine nucleotide exchange factor ARHGEF17 that promotes metastatic lung cancer progression. J Biol Chem 2021; 298:101440. [PMID: 34808208 PMCID: PMC8703085 DOI: 10.1016/j.jbc.2021.101440] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Revised: 11/10/2021] [Accepted: 11/18/2021] [Indexed: 12/12/2022] Open
Abstract
Metastatic lung cancer is a major cause of death worldwide. Dissemination of cancer cells can be facilitated by various agonists within the tumor microenvironment, including by lysophosphatidic acid (LPA). We postulate that Rho guanine nucleotide exchange factors (RhoGEFs), which integrate signaling cues driving cell migration, are critical effectors in metastatic cancer. Specifically, we addressed the hypothetical role of ARHGEF17, a RhoGEF, as a potential effector of Gβγ in metastatic lung cancer cells responding to LPA. Here, we show that ARHGEF17, originally identified as a tumor endothelial marker, is involved in tumor growth and metastatic dissemination of lung cancer cells in an immunocompetent murine model. Gene expression–based analysis of lung cancer datasets showed that increased levels of ARHGEF17 correlated with reduced survival of patients with advanced-stage tumors. Cellular assays also revealed that this RhoGEF participates in the invasive and migratory responses elicited by Gi protein–coupled LPA receptors via the Gβγ subunit complex. We demonstrate that this signaling heterodimer promoted ARHGEF17 recruitment to the cell periphery and actin fibers. Moreover, Gβγ allosterically activates ARHGEF17 by the removal of inhibitory intramolecular restrictions. Taken together, our results indicate that ARHGEF17 may be a valid potential target in the treatment of metastatic lung cancer.
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Troyanovsky RB, Indra I, Kato R, Mitchell BJ, Troyanovsky SM. Basolateral protein Scribble binds phosphatase PP1 to establish a signaling network maintaining apicobasal polarity. J Biol Chem 2021; 297:101289. [PMID: 34634305 PMCID: PMC8569552 DOI: 10.1016/j.jbc.2021.101289] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 10/04/2021] [Accepted: 10/06/2021] [Indexed: 01/25/2023] Open
Abstract
Scribble, a member of the LAP protein family, contributes to the apicobasal polarity (ABP) of epithelial cells. The LAP-unique region of these proteins, which is essential and sufficient for ABP, includes a conserved Leucine-Rich Repeat (LRR) domain. The major binding partners of this region that could regulate ABP remain unknown. Here, using proteomics, native gel electrophoresis, and site-directed mutagenesis, we show that the concave surface of LRR domain in Scribble participates in three types of mutually exclusive interactions-(i) homodimerization, serving as an auto-inhibitory mechanism; (ii) interactions with a diverse set of polarity proteins, such as Llgl1, Llgl2, EPB41L2, and EPB41L5, which produce distinct multiprotein complexes; and (iii) a direct interaction with the protein phosphatase, PP1. Analogy with the complex between PP1 and LRR domain of SDS22, a well-studied PP1 regulator, suggests that the Scibble-PP1 complex stores a latent form of PP1 in the basolateral cell cortex. Such organization may generate a dynamic signaling network wherein PP1 could be dispatched from the complex with Scribble to particular protein ligands, achieving fast dephosphorylation kinetics.
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Affiliation(s)
- Regina B Troyanovsky
- Department of Dermatology, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Indrajyoti Indra
- Department of Dermatology, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Rei Kato
- Department of Dermatology, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Brian J Mitchell
- Department of Cell & Developmental Biology, The Feinberg School of Medicine, Chicago, Illinois, USA
| | - Sergey M Troyanovsky
- Department of Dermatology, The Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA; Department of Cell & Developmental Biology, The Feinberg School of Medicine, Chicago, Illinois, USA.
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9
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The PKD-Dependent Biogenesis of TGN-to-Plasma Membrane Transport Carriers. Cells 2021; 10:cells10071618. [PMID: 34203456 PMCID: PMC8303525 DOI: 10.3390/cells10071618] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 06/14/2021] [Accepted: 06/24/2021] [Indexed: 01/30/2023] Open
Abstract
Membrane trafficking is essential for processing and transport of proteins and lipids and to establish cell compartmentation and tissue organization. Cells respond to their needs and control the quantity and quality of protein secretion accordingly. In this review, we focus on a particular membrane trafficking route from the trans-Golgi network (TGN) to the cell surface: protein kinase D (PKD)-dependent pathway for constitutive secretion mediated by carriers of the TGN to the cell surface (CARTS). Recent findings highlight the importance of lipid signaling by organelle membrane contact sites (MCSs) in this pathway. Finally, we discuss our current understanding of multiple signaling pathways for membrane trafficking regulation mediated by PKD, G protein-coupled receptors (GPCRs), growth factors, metabolites, and mechanosensors.
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10
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Dumitru CA, Brouwer E, Stelzer T, Nocerino S, Rading S, Wilkens L, Sandalcioglu IE, Karsak M. Dynein Light Chain Protein Tctex1: A Novel Prognostic Marker and Molecular Mediator in Glioblastoma. Cancers (Basel) 2021; 13:cancers13112624. [PMID: 34071761 PMCID: PMC8199143 DOI: 10.3390/cancers13112624] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/20/2021] [Accepted: 05/24/2021] [Indexed: 11/25/2022] Open
Abstract
Simple Summary Glioblastoma (GBM) remains one of the deadliest solid cancers, with only a dismal proportion of GBM patients achieving 5-year survival. Thus, it is critical to identify molecular mechanisms that could be targeted by novel therapeutic approaches in this tumor type. Our study identified Tctex1/DYNLT1 as an independent prognostic marker for the overall survival of GBM patients. Importantly, Tctex1 promoted the aggressiveness of GBM cells by enhancing tumor proliferation and invasion. These effects of Tctex1 appeared to be modulated via phosphorylation of retinoblastoma protein (RB) and the release of matrix metalloprotease 2 (MMP2), respectively. As Tctex1 can potentially be inhibited in vivo, our study provides a rationale for novel, individualized therapeutic strategies in GBM patients. Abstract The purpose of this study was to determine the role of Tctex1 (DYNLT1, dynein light chain-1) in the pathophysiology of glioblastoma (GBM). To this end, we performed immunohistochemical analyses on tissues from GBM patients (n = 202). Tctex1 was additionally overexpressed in two different GBM cell lines, which were then evaluated in regard to their proliferative and invasive properties. We found that Tctex1 levels were significantly higher in GBM compared to healthy adjacent brain tissues. Furthermore, high Tctex1 expression was significantly associated with the short overall- (p = 0.002, log-rank) and progression-free (p = 0.028, log-rank) survival of GBM patients and was an independent predictor of poor overall survival in multivariate Cox-regression models. In vitro, Tctex1 promoted the metabolic activity, anchorage-independent growth and proliferation of GBM cells. This phenomenon was previously shown to occur via the phosphorylation of retinoblastoma protein (phospho-RB). Here, we found a direct and significant correlation between the levels of Tctex1 and phospho-RB (Ser807/801) in tissues from GBM patients (p = 0.007, Rho = 0.284, Spearman’s rank). Finally, Tctex1 enhanced the invasiveness of GBM cells and the release of pro-invasive matrix metalloprotease 2 (MMP2). These findings indicate that Tctex1 promotes GBM progression and therefore might be a useful therapeutic target in this type of cancer.
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Affiliation(s)
- Claudia Alexandra Dumitru
- Department of Neurosurgery, Otto-von-Guericke University, 39120 Magdeburg, Germany;
- Correspondence: (C.A.D.); (M.K.)
| | - Eileen Brouwer
- Center for Molecular Neurobiology (ZMNH), University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany; (E.B.); (T.S.); (S.N.); (S.R.)
| | - Tamina Stelzer
- Center for Molecular Neurobiology (ZMNH), University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany; (E.B.); (T.S.); (S.N.); (S.R.)
| | - Salvatore Nocerino
- Center for Molecular Neurobiology (ZMNH), University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany; (E.B.); (T.S.); (S.N.); (S.R.)
| | - Sebastian Rading
- Center for Molecular Neurobiology (ZMNH), University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany; (E.B.); (T.S.); (S.N.); (S.R.)
| | - Ludwig Wilkens
- Department of Pathology, Nordstadt Hospital Hannover, 30167 Hannover, Germany;
| | | | - Meliha Karsak
- Center for Molecular Neurobiology (ZMNH), University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany; (E.B.); (T.S.); (S.N.); (S.R.)
- Correspondence: (C.A.D.); (M.K.)
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11
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Kilian LS, Voran J, Frank D, Rangrez AY. RhoA: a dubious molecule in cardiac pathophysiology. J Biomed Sci 2021; 28:33. [PMID: 33906663 PMCID: PMC8080415 DOI: 10.1186/s12929-021-00730-w] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 04/23/2021] [Indexed: 02/08/2023] Open
Abstract
The Ras homolog gene family member A (RhoA) is the founding member of Rho GTPase superfamily originally studied in cancer cells where it was found to stimulate cell cycle progression and migration. RhoA acts as a master switch control of actin dynamics essential for maintaining cytoarchitecture of a cell. In the last two decades, however, RhoA has been coined and increasingly investigated as an essential molecule involved in signal transduction and regulation of gene transcription thereby affecting physiological functions such as cell division, survival, proliferation and migration. RhoA has been shown to play an important role in cardiac remodeling and cardiomyopathies; underlying mechanisms are however still poorly understood since the results derived from in vitro and in vivo experiments are still inconclusive. Interestingly its role in the development of cardiomyopathies or heart failure remains largely unclear due to anomalies in the current data available that indicate both cardioprotective and deleterious effects. In this review, we aimed to outline the molecular mechanisms of RhoA activation, to give an overview of its regulators, and the probable mechanisms of signal transduction leading to RhoA activation and induction of downstream effector pathways and corresponding cellular responses in cardiac (patho)physiology. Furthermore, we discuss the existing studies assessing the presented results and shedding light on the often-ambiguous data. Overall, we provide an update of the molecular, physiological and pathological functions of RhoA in the heart and its potential in cardiac therapeutics.
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Affiliation(s)
- Lucia Sophie Kilian
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, Rosalind-Franklin Str. 12, 24105, Kiel, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, 24105, Kiel, Germany
| | - Jakob Voran
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, Rosalind-Franklin Str. 12, 24105, Kiel, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, 24105, Kiel, Germany
| | - Derk Frank
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, Rosalind-Franklin Str. 12, 24105, Kiel, Germany. .,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, 24105, Kiel, Germany.
| | - Ashraf Yusuf Rangrez
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, Rosalind-Franklin Str. 12, 24105, Kiel, Germany. .,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, 24105, Kiel, Germany. .,Department of Cardiology, Angiology and Pneumology, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
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12
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Pan W, Nagpal K, Suárez-Fueyo A, Ferretti A, Yoshida N, Tsokos MG, Tsokos GC. The Regulatory Subunit PPP2R2A of PP2A Enhances Th1 and Th17 Differentiation through Activation of the GEF-H1/RhoA/ROCK Signaling Pathway. THE JOURNAL OF IMMUNOLOGY 2021; 206:1719-1728. [PMID: 33762326 DOI: 10.4049/jimmunol.2001266] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 02/04/2021] [Indexed: 01/04/2023]
Abstract
Protein phosphatase 2A (PP2A) composed of a scaffold subunit, a catalytic subunit, and multiple regulatory subunits is a ubiquitously expressed serine/threonine phosphatase. We have previously shown that the PP2A catalytic subunit is increased in T cells from patients with systemic lupus erythematosus and promotes IL-17 production by enhancing the activity of Rho-associated kinase (ROCK) in T cells. However, the molecular mechanism whereby PP2A regulates ROCK activity is unknown. In this study, we show that the PP2A regulatory subunit PPP2R2A is increased in T cells from people with systemic lupus erythematosus and binds to, dephosphorylates, and activates the guanine nucleotide exchange factor GEF-H1 at Ser885, which in turn increases the levels of RhoA-GTP and the activity of ROCK in T cells. Genetic PPP2R2A deficiency in murine T cells reduced Th1 and Th17, but not regulatory T cell differentiation and mice with T cell-specific PPP2R2A deficiency displayed less autoimmunity when immunized with myelin oligodendrocyte glycoprotein peptide. Our studies indicate that PPP2R2A is the regulatory subunit that dictates the PP2A-directed enhanced Th1 and Th17 differentiation, and therefore, it represents a therapeutic target for pathologies linked to Th1 and Th17 cell expansion.
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Affiliation(s)
- Wenliang Pan
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - Kamalpreet Nagpal
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - Abel Suárez-Fueyo
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - Andrew Ferretti
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - Nobuya Yoshida
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - Maria G Tsokos
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - George C Tsokos
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
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13
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Natriuretic peptide receptor-C releases and activates guanine nucleotide-exchange factor H1 in a ligand-dependent manner. Biochem Biophys Res Commun 2021; 552:9-16. [PMID: 33740666 DOI: 10.1016/j.bbrc.2021.03.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/02/2021] [Accepted: 03/06/2021] [Indexed: 01/07/2023]
Abstract
Although natriuretic peptide receptor-C (NPR-C) is involved in the clearance of natriuretic peptides from plasma, it also possesses other physiological functions, such as inhibition of adenylyl cyclase activity through Gαi. However, the physiological roles and intracellular signaling pathways of NPR-C have yet been not fully elucidated. In this study, we identified a RhoA-specific guanine nucleotide-exchange factor, GEF-H1, as a novel binding protein of NPR-C. We demonstrated that endogenous NPR-C interacted with GEF-H1 in HeLa cells, and that the interaction between NPR-C and GEF-H1 was dependent on a 37-amino acid cytoplasmic region of NPR-C. In contrast, another natriuretic peptide receptor, NPR-A, which includes the kinase homology and guanylyl cyclase domains in the intracellular region, did not interact with GEF-H1. We also revealed that the ligands of NPR-C (i.e., ANP, CNP, and osteocrin) caused dissociation of GEF-H1 from NPR-C. Furthermore, osteocrin treatment induced phosphorylation of GEF-H1 at Ser-886, enhanced the interaction of GEF-H1 with 14-3-3, and increased the amount of activated GEF-H1. These findings strongly supported that NPR-C may be involved in diverse physiological roles by regulating GEF-H1 signaling.
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14
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Wang K, Jiang L, Hu A, Sun C, Zhou L, Huang Y, Chen Q, Dong J, Zhou X, Zhang F. Vertebral-specific activation of the CX3CL1/ICAM-1 signaling network mediates non-small-cell lung cancer spinal metastasis by engaging tumor cell-vertebral bone marrow endothelial cell interactions. Am J Cancer Res 2021; 11:4770-4789. [PMID: 33754027 PMCID: PMC7978319 DOI: 10.7150/thno.54235] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 02/11/2021] [Indexed: 02/06/2023] Open
Abstract
Rationale: The spine is one of the most common metastatic sites of non-small cell lung cancer (NSCLC), and NSCLC spinal metastasis results in serious consequences. Metastatic extravasation of disseminated cancer cells including increased invasiveness, adhesion and transendothelial migration is crucial for tumor metastasis. This study aimed to investigate the mechanisms underlying NSCLC spinal metastasis based on the C-X3-C motif chemokine ligand 1- (CX3CL1) and intercellular adhesion molecule-1- (ICAM-1) mediated signaling network. Methods: Immunohistochemistry, western blotting, and reverse transcription-quantitative PCR were conducted to detect the distribution of CX3CL1/ICAM-1 in different organs. Transwell, adhesion, and transendothelial migration assays were performed to evaluate the regulatory effects of CX3CL1/ICAM-1 on NSCLC cell invasion, adhesion, and transendothelial migration in vitro. A spontaneous spinal metastasis mouse model was established via injection of NSCLC cells into the left cardiac ventricle of NOD/SCID mice. The effects of CX3CL1/ICAM-1 on NSCLC spinal metastasis in vivo were validated using bioluminescent, micro-computerized tomography, immunohistochemistry and histological analyses. Results: CX3CL1 expression was specifically higher in vertebral bone compared with limb bones and lung tissue, and was associated with NSCLC spinal metastasis. Mechanically, vertebral bone marrow endothelial cells (VBMECs) enhanced NSCLC cell invasion via CX3CL1 signaling-mediated activation of the PI3K/AKT pathway. Furthermore, we found that VBMECs effectively induced ICAM-1-dependent NSCLC cell adhesion in coordination with platelets through the CX3CL1/ICAM-1/LFA-1 pathway. Meanwhile, CX3CL1 enhanced NSCLC cell transendothelial migration by increasing permeability of VBMECs via ICAM-1-dependent activation of the Src/GEF-H1 pathway. Interestingly, NSCLC cells were indicated to promote CX3CL1 secretion of VBMECs through MAPK14/ADMA17-dependent CX3CL1 release and NF-κB-dependent CX3CL1 synthesis. Based on these findings, we revealed a novel feedback cycle between circulating NSCLC cells and VBMECs mediated by CX3CL1/ICAM-1 signaling. Further disengagement of the CX3CL1/ICAM-1-mediated feedback cycle in vivo significantly restricted metastasis and prolonged mouse survival. Conclusions: Our results indicated a unique feedback cycle between circulating NSCLC cells and VBMECs mediated by CX3CL1/ICAM-1 signaling, which is necessary for NSCLC spinal metastasis. This work provides a new perspective for underlying the mechanisms of NSCLC spinal metastasis and indicates potential novel targets for the prevention of NSCLC spinal metastasis.
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15
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Wang C, Zhang H, Fu J, Wang M, Cai Y, Ding T, Jiang J, Koehler JE, Liu X, Yuan C. Bartonella type IV secretion effector BepC induces stress fiber formation through activation of GEF-H1. PLoS Pathog 2021; 17:e1009065. [PMID: 33508039 PMCID: PMC7842913 DOI: 10.1371/journal.ppat.1009065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Accepted: 10/13/2020] [Indexed: 12/27/2022] Open
Abstract
Bartonella T4SS effector BepC was reported to mediate internalization of big Bartonella aggregates into host cells by modulating F-actin polymerization. After that, BepC was indicated to induce host cell fragmentation, an interesting cell phenotype that is characterized by failure of rear-end retraction during cell migration, and subsequent dragging and fragmentation of cells. Here, we found that expression of BepC resulted in significant stress fiber formation and contractile cell morphology, which depended on combination of the N-terminus FIC (filamentation induced by c-AMP) domain and C-terminus BID (Bartonellaintracellular delivery) domain of BepC. The FIC domain played a key role in BepC-induced stress fiber formation and cell fragmentation because deletion of FIC signature motif or mutation of two conserved amino acid residues abolished BepC-induced cell fragmentation. Immunoprecipitation confirmed the interaction of BepC with GEF-H1 (a microtubule-associated RhoA guanosine exchange factor), and siRNA-mediated depletion of GEF-H1 prevented BepC-induced stress fiber formation. Interaction with BepC caused the dissociation of GEF-H1 from microtubules and activation of RhoA to induce formation of stress fibers. The ROCK (Rho-associated protein kinase) inhibitor Y27632 completely blocked BepC effects on stress fiber formation and cell contractility. Moreover, stress fiber formation by BepC increased the stability of focal adhesions, which consequently impeded rear-edge detachment. Overall, our study revealed that BepC-induced stress fiber formation was achieved through the GEF-H1/RhoA/ROCK pathway. Intracellular pathogens modulate host cell actin cytoskeleton by secreting an array of effector molecules to ensure their cell invasion and intracellular survival. The zoonotic pathogen Bartonella spp trigger massive F-actin polymerization of host cells resulting the internalization of large bacterial aggregates (called “invasome” structure), which is dependent on a functional VirB/VirD4 type IV secretion system (T4SS) and its translocated Bep effector proteins. Here, we have used cell infection and ectopic expression assay to identify that Bartonella T4SS effector BepC induces stress fiber formation in infected host cells. However, BepC also disrupts the balance of stress fiber formation and focal adhesion maturation, and eventually causes cell fragmentation. Using immunoprecipitation and RNAi approaches, we identify GEF-H1 is the host factor targeted by BepC. Interaction with BepC induces the release of GEF-H1 from microtubules to plasma membrane and subsequently activates RhoA-ROCK to induce stress fiber formation. These findings shed light on our understanding of how Bartonella invade host cell and establish infection.
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Affiliation(s)
- Chunyan Wang
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- Shanghai Key Laboratory of Veterinary Biotechnology, Shanghai, China
| | - Haoran Zhang
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- Shanghai Key Laboratory of Veterinary Biotechnology, Shanghai, China
| | - Jiaqi Fu
- Institute of Analytical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, China
| | - Meng Wang
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- Shanghai Key Laboratory of Veterinary Biotechnology, Shanghai, China
| | - Yuhao Cai
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- Shanghai Key Laboratory of Veterinary Biotechnology, Shanghai, China
| | - Tianyun Ding
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- Shanghai Key Laboratory of Veterinary Biotechnology, Shanghai, China
| | - Jiezhang Jiang
- Institute of Analytical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, China
| | - Jane E. Koehler
- Department of Medicine, Division of Infectious Diseases, and the Microbial Pathogenesis and Host Defense Program, University of California, San Francisco, California, United States of America
| | - Xiaoyun Liu
- Department of Microbiology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
- * E-mail: (XL); (CY)
| | - Congli Yuan
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
- Shanghai Key Laboratory of Veterinary Biotechnology, Shanghai, China
- * E-mail: (XL); (CY)
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16
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Comer S, Nagy Z, Bolado A, von Kriegsheim A, Gambaryan S, Walter U, Pagel O, Zahedi RP, Jurk K, Smolenski A. The RhoA regulators Myo9b and GEF-H1 are targets of cyclic nucleotide-dependent kinases in platelets. J Thromb Haemost 2020; 18:3002-3012. [PMID: 32692911 DOI: 10.1111/jth.15028] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 06/15/2020] [Accepted: 07/13/2020] [Indexed: 12/18/2022]
Abstract
BACKGROUND Circulating platelets are maintained in an inactive state by the endothelial lining of the vasculature. Endothelium-derived prostacyclin and nitric oxide stimulate cAMP- and cGMP-dependent kinases, PKA and PKG, to inhibit platelets. PKA and PKG effects include the inhibition of the GTPase RhoA, which has been suggested to involve the direct phosphorylation of RhoA on serine 188. OBJECTIVES We wanted to confirm RhoA S188 phosphorylation by cyclic nucleotide-dependent kinases and to identify possible alternative mechanisms of RhoA regulation in platelets. METHODS Phosphoproteomics data of human platelets were used to identify candidate PKA and PKG substrates. Phosphorylation of individual proteins was studied by Western blotting and Phos-tag gel electrophoresis in human platelets and transfected HEK293T cells. Pull-down assays were performed to analyze protein interaction and function. RESULTS Our data indicate that RhoA is not phosphorylated by PKA in platelets. Instead, we provide evidence that cyclic nucleotide effects are mediated through the phosphorylation of the RhoA-specific GTPase-activating protein Myo9b and the guanine nucleotide exchange factor GEF-H1. We identify Myo9b S1354 and guanine nucleotide exchange factor-H1 (GEF-H1) S886 as PKA and PKG phosphorylation sites. Myo9b S1354 phosphorylation enhances its GTPase activating protein function leading to reduced RhoA-GTP levels. GEF-H1 S886 phosphorylation stimulates binding of 14-3-3β and has been shown to inhibit GEF function by facilitating binding of GEF-H1 to microtubules. Microtubule disruption increases RhoA-GTP levels confirming the importance of GEF-H1 in platelets. CONCLUSION Phosphorylation of RhoA regulatory proteins Myo9b and GEF-H1, but not RhoA itself, is involved in cyclic nucleotide-mediated control of RhoA in human platelets.
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Affiliation(s)
- Shane Comer
- UCD School of Medicine and Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, Dublin 2, Ireland
| | - Zoltan Nagy
- UCD School of Medicine and Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
- Institute of Experimental Biomedicine, University Hospital and Rudolf Virchow Center, University of Würzburg, Würzburg, Germany
| | - Alfonso Bolado
- Cancer Research UK Edinburgh Centre, University of Edinburgh, Edinburgh, UK
| | | | - Stepan Gambaryan
- Sechenov Institute for Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, Russia
| | - Ulrich Walter
- Center for Thrombosis and Hemostasis, University Medical Center Mainz, Mainz, Germany
| | - Oliver Pagel
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., Dortmund, Germany
| | - René P Zahedi
- Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V., Dortmund, Germany
- Segal Cancer Proteomics Centre, Lady Davis Institute, Jewish General Hospital, McGill University, Montreal, QC, Canada
| | - Kerstin Jurk
- Center for Thrombosis and Hemostasis, University Medical Center Mainz, Mainz, Germany
| | - Albert Smolenski
- UCD School of Medicine and Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland
- Irish Centre for Vascular Biology, Royal College of Surgeons in Ireland, Dublin 2, Ireland
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17
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Joo E, Olson MF. Regulation and functions of the RhoA regulatory guanine nucleotide exchange factor GEF-H1. Small GTPases 2020; 12:358-371. [PMID: 33126816 PMCID: PMC8583009 DOI: 10.1080/21541248.2020.1840889] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Since the discovery by Madaule and Axel in 1985 of the first Ras homologue (Rho) protein in Aplysia and its human orthologue RhoB, membership in the Rho GTPase family has grown to 20 proteins, with representatives in all eukaryotic species. These GTPases are molecular switches that cycle between active (GTP bound) and inactivate (GDP bound) states. The exchange of GDP for GTP on Rho GTPases is facilitated by guanine exchange factors (GEFs). Approximately 80 Rho GEFs have been identified to date, and only a few GEFs associate with microtubules. The guanine nucleotide exchange factor H1, GEF-H1, is a unique GEF that associates with microtubules and is regulated by the polymerization state of microtubule networks. This review summarizes the regulation and functions of GEF-H1 and discusses the roles of GEF-H1 in human diseases.
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Affiliation(s)
- Emily Joo
- Department of Chemistry and Biology, Ryerson University, Toronto, ON, Canada
| | - Michael F Olson
- Department of Chemistry and Biology, Ryerson University, Toronto, ON, Canada
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18
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Pan M, Chew TW, Wong DCP, Xiao J, Ong HT, Chin JFL, Low BC. BNIP-2 retards breast cancer cell migration by coupling microtubule-mediated GEF-H1 and RhoA activation. SCIENCE ADVANCES 2020; 6:eaaz1534. [PMID: 32789168 PMCID: PMC7399486 DOI: 10.1126/sciadv.aaz1534] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 06/18/2020] [Indexed: 06/11/2023]
Abstract
Microtubules display dynamic turnover during cell migration, leading to cell contractility and focal adhesion maturation regulated by Rho guanosine triphosphatase activity. This interplay between microtubules and actomyosin is mediated by guanine nucleotide exchange factor (GEF)-H1 released after microtubule depolymerization or microtubule disconnection from focal adhesions. However, how GEF-H1 activates Rho upon microtubule disassembly remains elusive. Here, we found that BNIP-2, a BCH domain-containing protein that binds both RhoA and GEF-H1 and traffics with kinesin-1 on microtubules, is important for GEF-H1-driven RhoA activation upon microtubule disassembly. Depletion of BNIP-2 in MDA-MB-231 breast cancer cells decreases RhoA activity and promotes cell migration. Upon nocodazole-induced microtubule disassembly, the interaction between BNIP-2 and GEF-H1 increases, while knockdown of BNIP-2 reduces RhoA activation and cell rounding via uncoupling RhoA-GEF-H1 interaction. Together, these findings revealed that BNIP-2 couples microtubules and focal adhesions via scaffolding GEF-H1 and RhoA, fine-tuning RhoA activity and cell migration.
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Affiliation(s)
- Meng Pan
- Mechanobiology Institute, 5A Engineering Drive 1, National University of Singapore, Singapore 117411, Singapore
| | - Ti Weng Chew
- Mechanobiology Institute, 5A Engineering Drive 1, National University of Singapore, Singapore 117411, Singapore
| | - Darren Chen Pei Wong
- Mechanobiology Institute, 5A Engineering Drive 1, National University of Singapore, Singapore 117411, Singapore
| | - Jingwei Xiao
- Mechanobiology Institute, 5A Engineering Drive 1, National University of Singapore, Singapore 117411, Singapore
| | - Hui Ting Ong
- Mechanobiology Institute, 5A Engineering Drive 1, National University of Singapore, Singapore 117411, Singapore
| | - Jasmine Fei Li Chin
- Mechanobiology Institute, 5A Engineering Drive 1, National University of Singapore, Singapore 117411, Singapore
| | - Boon Chuan Low
- Mechanobiology Institute, 5A Engineering Drive 1, National University of Singapore, Singapore 117411, Singapore
- Department of Biological Sciences, 14 Science Drive 4, National University of Singapore, Singapore 117543, Singapore
- University Scholars Programme, 18 College Avenue East, Singapore 138593, Singapore
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19
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Douanne T, Chapelier S, Rottapel R, Gavard J, Bidère N. The LUBAC participates in lysophosphatidic acid-induced NF-κB activation. Cell Immunol 2020; 353:104133. [PMID: 32450431 DOI: 10.1016/j.cellimm.2020.104133] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/29/2020] [Accepted: 05/12/2020] [Indexed: 12/16/2022]
Abstract
The natural bioactive glycerophospholipid lysophosphatidic acid (LPA) binds to its cognate G protein-coupled receptors (GPCRs) on the cell surface to promote the activation of several transcription factors, including NF-κB. LPA-mediated activation of NF-κB relies on the formation of a signalosome that contains the scaffold CARMA3, the adaptor BCL10 and the paracaspase MALT1 (CBM complex). The CBM complex has been extensively studied in lymphocytes, where it links antigen receptors to NF-κB activation via the recruitment of the linear ubiquitin assembly complex (LUBAC), a tripartite complex of HOIP, HOIL1 and SHARPIN. Moreover, MALT1 cleaves the LUBAC subunit HOIL1 to further enhance NF-κB activation. However, the contribution of the LUBAC downstream of GPCRs has not been investigated. By using murine embryonic fibroblasts from mice deficient for HOIP, HOIL1 and SHARPIN, we report that the LUBAC is crucial for the activation of NF-κB in response to LPA. Further echoing the situation in lymphocytes, LPA unbridles the protease activity of MALT1, which cleaves HOIL1 at the Arginine 165. The expression of a MALT1-insensitive version of HOIL1 reveals that this processing is involved in the optimal production of the NF-κB target cytokine interleukin-6. Lastly, we provide evidence that the guanine exchange factor GEF-H1 favors MALT1-mediated cleavage of HOIL1 and NF-κB signaling in this context. Together, our results unveil a critical role for the LUBAC as a positive regulator of NF-κB signaling downstream of LPA receptors.
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Affiliation(s)
- Tiphaine Douanne
- Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France
| | - Sarah Chapelier
- Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France
| | - Robert Rottapel
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
| | - Julie Gavard
- Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France; Institut de Cancérologie de l'Ouest, Site René Gauducheau, 44800 Saint-Herblain, France
| | - Nicolas Bidère
- Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France.
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20
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Azoitei ML, Noh J, Marston DJ, Roudot P, Marshall CB, Daugird TA, Lisanza SL, Sandí MJ, Ikura M, Sondek J, Rottapel R, Hahn KM, Danuser G. Spatiotemporal dynamics of GEF-H1 activation controlled by microtubule- and Src-mediated pathways. J Cell Biol 2019; 218:3077-3097. [PMID: 31420453 PMCID: PMC6719461 DOI: 10.1083/jcb.201812073] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 06/21/2019] [Accepted: 07/23/2019] [Indexed: 02/08/2023] Open
Abstract
Rho family GTPases are activated with precise spatiotemporal control by guanine nucleotide exchange factors (GEFs). Guanine exchange factor H1 (GEF-H1), a RhoA activator, is thought to act as an integrator of microtubule (MT) and actin dynamics in diverse cell functions. Here we identify a GEF-H1 autoinhibitory sequence and exploit it to produce an activation biosensor to quantitatively probe the relationship between GEF-H1 conformational change, RhoA activity, and edge motion in migrating cells with micrometer- and second-scale resolution. Simultaneous imaging of MT dynamics and GEF-H1 activity revealed that autoinhibited GEF-H1 is localized to MTs, while MT depolymerization subadjacent to the cell cortex promotes GEF-H1 activation in an ~5-µm-wide peripheral band. GEF-H1 is further regulated by Src phosphorylation, activating GEF-H1 in a narrower band ~0-2 µm from the cell edge, in coordination with cell protrusions. This indicates a synergistic intersection between MT dynamics and Src signaling in RhoA activation through GEF-H1.
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Affiliation(s)
- Mihai L Azoitei
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Jungsik Noh
- Deptartment of Bioinformatics, University of Texas Southwestern Medical Center, Dallas, TX
| | - Daniel J Marston
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Philippe Roudot
- Deptartment of Bioinformatics, University of Texas Southwestern Medical Center, Dallas, TX
| | | | - Timothy A Daugird
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Sidney L Lisanza
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - María-José Sandí
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Mitsu Ikura
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada
| | - John Sondek
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Robert Rottapel
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada.,Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada
| | - Klaus M Hahn
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC .,Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Gaudenz Danuser
- Deptartment of Bioinformatics, University of Texas Southwestern Medical Center, Dallas, TX
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21
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Eisler SA, Curado F, Link G, Schulz S, Noack M, Steinke M, Olayioye MA, Hausser A. A Rho signaling network links microtubules to PKD controlled carrier transport to focal adhesions. eLife 2018; 7:35907. [PMID: 30028295 PMCID: PMC6070338 DOI: 10.7554/elife.35907] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 07/19/2018] [Indexed: 12/22/2022] Open
Abstract
Protein kinase D (PKD) is a family of serine/threonine kinases that is required for the structural integrity and function of the Golgi complex. Despite its importance in the regulation of Golgi function, the molecular mechanisms regulating PKD activity are still incompletely understood. Using the genetically encoded PKD activity reporter G-PKDrep we now uncover a Rho signaling network comprising GEF-H1, the RhoGAP DLC3, and the Rho effector PLCε that regulate the activation of PKD at trans-Golgi membranes. We further show that this molecular network coordinates the formation of TGN-derived Rab6-positive transport carriers delivering cargo for localized exocytosis at focal adhesions.
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Affiliation(s)
- Stephan A Eisler
- Stuttgart Research Center Systems Biology, University of Stuttgart, Stuttgart, Germany
| | - Filipa Curado
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Gisela Link
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Sarah Schulz
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Melanie Noack
- Stuttgart Research Center Systems Biology, University of Stuttgart, Stuttgart, Germany
| | - Maren Steinke
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Monilola A Olayioye
- Stuttgart Research Center Systems Biology, University of Stuttgart, Stuttgart, Germany.,Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Angelika Hausser
- Stuttgart Research Center Systems Biology, University of Stuttgart, Stuttgart, Germany.,Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
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22
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Ismail OZ, Sriranganathan S, Zhang X, Bonventre JV, Zervos AS, Gunaratnam L. Tctex-1, a novel interaction partner of Kidney Injury Molecule-1, is required for efferocytosis. J Cell Physiol 2018; 233:6877-6895. [PMID: 29693725 DOI: 10.1002/jcp.26578] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 03/01/2018] [Indexed: 02/04/2023]
Abstract
Kidney injury molecule-1 (KIM-1) is a phosphatidylserine receptor that is specifically upregulated on proximal tubular epithelial cells (PTECs) during acute kidney injury and mitigates tissue damage by mediating efferocytosis (the phagocytic clearance of apoptotic cells). The signaling molecules that regulate efferocytosis in TECs are not well understood. Using a yeast two-hybrid screen, we identified the dynein light chain protein, Tctex-1, as a novel KIM-1-interacting protein. Immunoprecipitation and confocal imaging studies suggested that Tctex-1 associates with KIM-1 in cells at baseline, but, dissociates from KIM-1 within 90 min of initiation of efferocytosis. Interfering with actin or microtubule polymerization interestingly prevented the dissociation of KIM-1 from Tctex-1. Moreover, the subcellular localization of Tctex-1 changed from being microtubule-associated to mainly cytosolic upon expression of KIM-1. Short hairpin RNA-mediated silencing of endogenous Tctex-1 in cells significantly inhibited efferocytosis to levels comparable to that of knock down of KIM-1 in the same cells. Importantly, Tctex-1 was not involved in the delivery of KIM-1 to the cell-surface. On the other hand, KIM-1 expression significantly inhibited the phosphorylation of Tctex-1 at threonine 94 (T94), a post-translational modification which is known to disrupt the binding of Tctex-1 to dynein on microtubules. In keeping with this, we found that KIM-1 bound less efficiently to the phosphomimic (T94E) mutant of Tctex-1 compared to wild type Tctex-1. Surprisingly, expression of Tctex-1 T94E did not influence KIM-1-mediated efferocytosis. Our studies uncover a previously unknown role for Tctex-1 in KIM-1-dependent efferocytosis in epithelial cells.
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Affiliation(s)
- Ola Z Ismail
- Matthew Mailing Center for Translational Transplant Studies, London Health Sciences Center, Lawson Health Research Institute, London, Ontario, Canada
| | - Saranga Sriranganathan
- Matthew Mailing Center for Translational Transplant Studies, London Health Sciences Center, Lawson Health Research Institute, London, Ontario, Canada
| | - Xizhong Zhang
- Matthew Mailing Center for Translational Transplant Studies, London Health Sciences Center, Lawson Health Research Institute, London, Ontario, Canada
| | - Joseph V Bonventre
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Antonis S Zervos
- Burnett School of Biomedical Sciences, University of Central Florida College of Medicine, Orlando, Florida
| | - Lakshman Gunaratnam
- Matthew Mailing Center for Translational Transplant Studies, London Health Sciences Center, Lawson Health Research Institute, London, Ontario, Canada.,Division of Nephrology, Department of Medicine, Schulich School of Medicine and Dentistry, London, Western University, Ontario, Canada
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23
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Gebregiworgis T, Marshall CB, Nishikawa T, Radulovich N, Sandí MJ, Fang Z, Rottapel R, Tsao MS, Ikura M. Multiplexed Real-Time NMR GTPase Assay for Simultaneous Monitoring of Multiple Guanine Nucleotide Exchange Factor Activities from Human Cancer Cells and Organoids. J Am Chem Soc 2018. [PMID: 29543440 DOI: 10.1021/jacs.7b13703] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Small GTPases (sGTPases) are critical switch-like regulators that mediate several important cellular functions and are often mutated in human cancers. They are activated by guanine nucleotide exchange factors (GEFs), which specifically catalyze the exchange of GTP for GDP. GEFs coordinate signaling networks in normal cells, and are frequently deregulated in cancers. sGTPase signaling pathways are complex and interconnected; however, most GEF assays do not reveal such complexity. In this Communication, we describe the development of a unique real-time NMR-based multiplexed GEF assay that employs distinct isotopic labeling schemes for each sGTPase protein to enable simultaneous observation of six proteins of interest. We monitor nucleotide exchange of KRas, Rheb, RalB, RhoA, Cdc42 and Rac1 in a single system, and assayed the activities of GEFs in lysates of cultured human cells and 3D organoids derived from pancreatic cancer patients. We observed potent activation of RhoA by lysates of HEK293a cells transfected with GEF-H1, along with weak stimulation of Rac1, which we showed is indirect. Our functional analyses of pancreatic cancer-derived organoids revealed higher GEF activity for RhoA than other sGTPases, in line with RNA-seq data indicating high expression of RhoA-specific GEFs.
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Affiliation(s)
- Teklab Gebregiworgis
- Princess Margaret Cancer Centre , University Health Network , Toronto , Ontario M5G 1L7 , Canada
| | - Christopher B Marshall
- Princess Margaret Cancer Centre , University Health Network , Toronto , Ontario M5G 1L7 , Canada
| | - Tadateru Nishikawa
- Princess Margaret Cancer Centre , University Health Network , Toronto , Ontario M5G 1L7 , Canada
| | - Nikolina Radulovich
- Princess Margaret Cancer Centre , University Health Network , Toronto , Ontario M5G 1L7 , Canada
| | - María-José Sandí
- Princess Margaret Cancer Centre , University Health Network , Toronto , Ontario M5G 1L7 , Canada
| | - Zhenhao Fang
- Princess Margaret Cancer Centre , University Health Network , Toronto , Ontario M5G 1L7 , Canada.,Department of Medical Biophysics , University of Toronto , Toronto , Ontario M5G 1L7 , Canada
| | - Robert Rottapel
- Princess Margaret Cancer Centre , University Health Network , Toronto , Ontario M5G 1L7 , Canada.,Department of Medical Biophysics , University of Toronto , Toronto , Ontario M5G 1L7 , Canada
| | - Ming-Sound Tsao
- Princess Margaret Cancer Centre , University Health Network , Toronto , Ontario M5G 1L7 , Canada.,Department of Medical Biophysics , University of Toronto , Toronto , Ontario M5G 1L7 , Canada.,Department of Laboratory Medicine and Pathobiology , University of Toronto , Toronto , Ontario M5S 1A1 , Canada
| | - Mitsuhiko Ikura
- Princess Margaret Cancer Centre , University Health Network , Toronto , Ontario M5G 1L7 , Canada.,Department of Medical Biophysics , University of Toronto , Toronto , Ontario M5G 1L7 , Canada
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24
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Lawson CD, Ridley AJ. Rho GTPase signaling complexes in cell migration and invasion. J Cell Biol 2018; 217:447-457. [PMID: 29233866 PMCID: PMC5800797 DOI: 10.1083/jcb.201612069] [Citation(s) in RCA: 329] [Impact Index Per Article: 54.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 10/23/2017] [Accepted: 11/17/2017] [Indexed: 12/02/2022] Open
Abstract
Cell migration is dependent on the dynamic formation and disassembly of actin filament-based structures, including lamellipodia, filopodia, invadopodia, and membrane blebs, as well as on cell-cell and cell-extracellular matrix adhesions. These processes all involve Rho family small guanosine triphosphatases (GTPases), which are regulated by the opposing actions of guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs). Rho GTPase activity needs to be precisely tuned at distinct cellular locations to enable cells to move in response to different environments and stimuli. In this review, we focus on the ability of RhoGEFs and RhoGAPs to form complexes with diverse binding partners, and describe how this influences their ability to control localized GTPase activity in the context of migration and invasion.
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Affiliation(s)
- Campbell D Lawson
- Randall Centre for Cell and Molecular Biophysics, King's College London, London, England, UK
| | - Anne J Ridley
- Randall Centre for Cell and Molecular Biophysics, King's College London, London, England, UK
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25
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Sandí MJ, Marshall CB, Balan M, Coyaud É, Zhou M, Monson DM, Ishiyama N, Chandrakumar AA, La Rose J, Couzens AL, Gingras AC, Raught B, Xu W, Ikura M, Morrison DK, Rottapel R. MARK3-mediated phosphorylation of ARHGEF2 couples microtubules to the actin cytoskeleton to establish cell polarity. Sci Signal 2017; 10:10/503/eaan3286. [PMID: 29089450 DOI: 10.1126/scisignal.aan3286] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The PAR-1-MARK pathway controls cell polarity through the phosphorylation of microtubule-associated proteins. Rho-Rac guanine nucleotide exchange factor 2 (ARHGEF2), which activates Ras homolog family member A (RHOA), is anchored to the microtubule network and sequestered in an inhibited state through binding to dynein light chain Tctex-1 type 1 (DYNLT1). We showed in mammalian cells that liver kinase B1 (LKB1) activated the microtubule affinity-regulating kinase 3 (MARK3), which in turn phosphorylated ARHGEF2 at Ser151 This modification disrupted the interaction between ARHGEF2 and DYNLT1 by generating a 14-3-3 binding site in ARHGEF2, thus causing ARHGEF2 to dissociate from microtubules. Phosphorylation of ARHGEF2 by MARK3 stimulated RHOA activation and the formation of stress fibers and focal adhesions, and was required for organized cellular architecture in three-dimensional culture. Protein phosphatase 2A (PP2A) dephosphorylated Ser151 in ARHGEF2 to restore the inhibited state. Thus, we have identified a regulatory switch controlled by MARK3 that couples microtubules to the actin cytoskeleton to establish epithelial cell polarity through ARHGEF2.
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Affiliation(s)
- María-José Sandí
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada
| | - Christopher B Marshall
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada
| | - Marc Balan
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada.,Department of Medical Biophysics, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - Étienne Coyaud
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada
| | - Ming Zhou
- Center for Cancer Research, National Cancer Institute at Frederick, P.O. Box B, Frederick, MD 21702, USA
| | - Daniel M Monson
- Center for Cancer Research, National Cancer Institute at Frederick, P.O. Box B, Frederick, MD 21702, USA
| | - Noboru Ishiyama
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada
| | - Arun A Chandrakumar
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada.,Department of Medical Biophysics, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - José La Rose
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada
| | - Amber L Couzens
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario M5G 1X5, Canada
| | - Anne-Claude Gingras
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, 600 University Avenue, Toronto, Ontario M5G 1X5, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Brian Raught
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada.,Department of Medical Biophysics, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - Wei Xu
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada.,Department of Biostatistics, Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - Mitsuhiko Ikura
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada.,Department of Medical Biophysics, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada
| | - Deborah K Morrison
- Center for Cancer Research, National Cancer Institute at Frederick, P.O. Box B, Frederick, MD 21702, USA
| | - Robert Rottapel
- Princess Margaret Cancer Centre, University Health Network, 101 College Street, Princess Margaret Cancer Research Tower, Toronto, Ontario M5G 1L7, Canada. .,Department of Medical Biophysics, University of Toronto, 1 King's College Circle, Toronto, Ontario M5S 1A8, Canada.,Department of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada.,Department of Immunology, University of Toronto, Toronto, Ontario M5S 1A8, Canada.,Division of Rheumatology, St. Michael's Hospital, 30 Bond Street, Toronto, Ontario M5B 1W8, Canada
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26
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Abstract
Malignant carcinomas are often characterized by metastasis, the movement of carcinoma cells from a primary site to colonize distant organs. For metastasis to occur, carcinoma cells first must adopt a pro-migratory phenotype and move through the surrounding stroma towards a blood or lymphatic vessel. Currently, there are very limited possibilities to target these processes therapeutically. The family of Rho GTPases is an ubiquitously expressed division of GTP-binding proteins involved in the regulation of cytoskeletal dynamics and intracellular signaling. The best characterized members of the Rho family GTPases are RhoA, Rac1 and Cdc42. Abnormalities in Rho GTPase function have major consequences for cancer progression. Rho GTPase activation is driven by cell surface receptors that activate GTP exchange factors (GEFs) and GTPase-activating proteins (GAPs). In this review, we summarize our current knowledge on Rho GTPase function in the regulation of metastasis. We will focus on key discoveries in the regulation of epithelial-mesenchymal-transition (EMT), cell-cell junctions, formation of membrane protrusions, plasticity of cell migration and adaptation to a hypoxic environment. In addition, we will emphasize on crosstalk between Rho GTPase family members and other important oncogenic pathways, such as cyclic AMP-mediated signaling, canonical Wnt/β-catenin, Yes-associated protein (YAP) and hypoxia inducible factor 1α (Hif1α) and provide an overview of the advancements and challenges in developing pharmacological tools to target Rho GTPase and the aforementioned crosstalk in the context of cancer therapeutics.
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27
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Umeda S, Kanda M, Sugimoto H, Tanaka H, Hayashi M, Yamada S, Fujii T, Takami H, Niwa Y, Iwata N, Tanaka C, Kobayashi D, Fujiwara M, Kodera Y. Downregulation of GPR155 as a prognostic factor after curative resection of hepatocellular carcinoma. BMC Cancer 2017; 17:610. [PMID: 28863781 PMCID: PMC5580443 DOI: 10.1186/s12885-017-3629-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 08/28/2017] [Indexed: 12/16/2022] Open
Abstract
Background Molecular biomarkers capable of predicting recurrence patterns and prognosis are helpful for risk stratification and providing appropriate treatment to patients with hepatocellular carcinoma (HCC). In this study, we focused on G protein-coupled receptor 155 (GPR155), a cell surface signaling protein, as a candidate biomarker. Methods We analyzed GPR155 expression, DNA methylation, and copy number in HCC cell lines. The clinical significance of GPR155 expression was evaluated using 144 pairs of surgically resected liver and normal tissues with subgroup analysis based on hepatitis virus infection. Results GPR155 mRNA expression levels were differential and were decreased in 89% of HCC cell lines. No DNA methylation was detected, whereas copy number alterations were present in five (56%) HCC cell lines. GPR155 mRNA expression level was independent of background liver status and significantly lower in HCC tissues than corresponding normal liver tissues. The expression patterns of GPR155 protein by immunohistochemical staining were significantly associated with those of GPR155 mRNA. Downregulation of GPR155 was significantly associated with more aggressive HCC phenotypes including high preoperative α-fetoprotein, poor differentiation, serosal infiltration, vascular invasion, and advanced disease stage. Patients with downregulation of GPR155 were more likely to have worse prognosis after curative resection irrespective of hepatitis virus infection. Patients who experienced extrahepatic (distant) recurrences had significantly lower GPR155 expression than those with intrahepatic (liver confined) recurrences. Conclusions Downregulation of GPR155 may serve as a prognosticator that also predicts initial recurrence sites independent of hepatitis virus infection. Electronic supplementary material The online version of this article (10.1186/s12885-017-3629-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Shinichi Umeda
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Mitsuro Kanda
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan.
| | - Hiroyuki Sugimoto
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Haruyoshi Tanaka
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Masamichi Hayashi
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Suguru Yamada
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Tsutomu Fujii
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Hideki Takami
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Yukiko Niwa
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Naoki Iwata
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Chie Tanaka
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Daisuke Kobayashi
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Michitaka Fujiwara
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
| | - Yasuhiro Kodera
- Department of Gastroenterological Surgery (Surgery II), Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan
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28
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Fine N, Dimitriou ID, Rullo J, Sandí MJ, Petri B, Haitsma J, Ibrahim H, La Rose J, Glogauer M, Kubes P, Cybulsky M, Rottapel R. GEF-H1 is necessary for neutrophil shear stress-induced migration during inflammation. J Cell Biol 2017; 215:107-119. [PMID: 27738004 PMCID: PMC5057286 DOI: 10.1083/jcb.201603109] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 09/19/2016] [Indexed: 12/14/2022] Open
Abstract
In their work, Fine et al. demonstrate that GEF-H1 is required for the spreading and crawling of neutrophils in response to intravascular blood flow. They uncover a novel mechanism that couples shear stress with Rho-dependent migratory behavior of neutrophils during inflammation. Leukocyte crawling and transendothelial migration (TEM) are potentiated by shear stress caused by blood flow. The mechanism that couples shear stress to migration has not been fully elucidated. We found that mice lacking GEF-H1 (GEF-H1−/−), a RhoA-specific guanine nucleotide exchange factor (GEF), displayed limited migration and recruitment of neutrophils into inflamed tissues. GEF-H1−/− leukocytes were deficient in in vivo crawling and TEM in the postcapillary venules. We demonstrated that although GEF-H1 deficiency had little impact on the migratory properties of neutrophils under static conditions, shear stress triggered GEF-H1–dependent spreading and crawling of neutrophils and relocalization of GEF-H1 to flotillin-2–rich uropods. Our results identify GEF-H1 as a component of the shear stress response machinery in neutrophils required for a fully competent immune response to bacterial infection.
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Affiliation(s)
- Noah Fine
- Princess Margaret Cancer Center, Toronto, Ontario M5G 1L7, Canada Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5S 1L7, Canada Matrix Dynamics Group, University of Toronto, Toronto, Ontario M5S 3E2, Canada
| | - Ioannis D Dimitriou
- Princess Margaret Cancer Center, Toronto, Ontario M5G 1L7, Canada Department of Immunology, University of Toronto, Toronto, Ontario M5S 1L7, Canada
| | - Jacob Rullo
- Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada
| | - María José Sandí
- Princess Margaret Cancer Center, Toronto, Ontario M5G 1L7, Canada
| | - Björn Petri
- Immunology Research Group, Department of Physiology and Pharmacology, Calvin, Phoebe and Joan Snyder Institute for Infection, Immunity and Inflammation, University of Calgary, Calgary, Alberta T2N 4N1, Canada
| | - Jack Haitsma
- Department of Anesthesiology, VU Medical Center, 1081 HV Amsterdam, Netherlands
| | - Hisham Ibrahim
- Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada
| | - Jose La Rose
- Princess Margaret Cancer Center, Toronto, Ontario M5G 1L7, Canada
| | - Michael Glogauer
- Matrix Dynamics Group, University of Toronto, Toronto, Ontario M5S 3E2, Canada
| | - Paul Kubes
- Immunology Research Group, Department of Physiology and Pharmacology, Calvin, Phoebe and Joan Snyder Institute for Infection, Immunity and Inflammation, University of Calgary, Calgary, Alberta T2N 4N1, Canada
| | - Myron Cybulsky
- Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada
| | - Robert Rottapel
- Princess Margaret Cancer Center, Toronto, Ontario M5G 1L7, Canada Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5S 1L7, Canada Department of Immunology, University of Toronto, Toronto, Ontario M5S 1L7, Canada Department of Medicine, University of Toronto, Toronto, Ontario M5S 1L7, Canada Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 2C4, Canada
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29
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Zago G, Biondini M, Camonis J, Parrini MC. A family affair: A Ral-exocyst-centered network links Ras, Rac, Rho signaling to control cell migration. Small GTPases 2017; 10:323-330. [PMID: 28498728 DOI: 10.1080/21541248.2017.1310649] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Cell migration is central to many developmental, physiologic and pathological processes, including cancer progression. The Ral GTPases (RalA and RalB) which act down-stream the Ras oncogenes, are key players in the coordination between membrane trafficking and actin polymerization. A major direct effector of Ral, the exocyst complex, works in polarized exocytosis and is at the center of multiple protein-protein interactions that support cell migration by promoting protrusion formation, front-rear polarization, and extra-cellular matrix degradation. In this review we describe the recent advancements in deciphering the molecular mechanisms underlying this role of Ral via exocyst on cell migration. Among others, we will discuss the recently identified cross-talk between Ral and Rac1 pathways: exocyst binds to a negative regulator (the RacGAP SH3BP1) and to the major effector (the Wave Regulatory Complex, WRC) of Rac1, the master regulator of protrusions. Next challenge will be to better characterize the dynamics in space and in time of these molecular interplays, to better understand the pleiotropic functions of Ral in both normal and cancer cells.
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Affiliation(s)
- Giulia Zago
- a Institut Curie, Centre de Recherche, Paris Sciences et Lettres Research University , Paris , France.,b ART group, Inserm U830 , Paris , France
| | - Marco Biondini
- a Institut Curie, Centre de Recherche, Paris Sciences et Lettres Research University , Paris , France.,b ART group, Inserm U830 , Paris , France
| | - Jacques Camonis
- a Institut Curie, Centre de Recherche, Paris Sciences et Lettres Research University , Paris , France.,b ART group, Inserm U830 , Paris , France
| | - Maria Carla Parrini
- a Institut Curie, Centre de Recherche, Paris Sciences et Lettres Research University , Paris , France.,b ART group, Inserm U830 , Paris , France
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30
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Ren Y, Wang X, Lou Z, Huang S, Zhuang H, Wang Y, Weng G, Wang P. Induction of cell cycle arrest by increasing GTP‑RhoA levels via Taxol‑induced microtubule polymerization in renal cell carcinoma. Mol Med Rep 2017; 15:4273-4279. [PMID: 28487984 PMCID: PMC5436224 DOI: 10.3892/mmr.2017.6543] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 01/20/2017] [Indexed: 12/12/2022] Open
Abstract
Renal cell carcinoma (RCC) is the most common neoplasm of the kidney in adults, accounting for ~3% of adult malignancies. Understanding the underlying mechanism of RCC tumorigenesis is necessary to improve patient survival. The present study revealed that Taxol-induced microtubule (MT) polymerization causes cell cycle arrest and an increase in guanosine triphosphate-Ras homology gene family, member A (GTP-RhoA) protein expression. Disruption of Taxol-induced MT polymerization reversed GTP-RhoA expression and cell cycle arrest. The localization and redistribution of MTs and RhoA were consistent in cells with MT bundles and those without. Decreased GTP-RhoA had no marked effect on Taxol-induced MT bundling, however, it reduced the proportion of cells in G2/M phase. Taken together, Taxol-induced MT polymerization regulated the protein expression levels of GTP-RhoA and cell cycle arrest. However, the alteration in GTP-RhoA expression did not influence MT arrangement, suggesting that GTP-RhoA serves a pivotal role in Taxol-induced MT polymerization and cell cycle arrest in RCC.
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Affiliation(s)
- Yu Ren
- Department of Urologic Surgery, Ningbo Urology and Nephrology Hospital, Ningbo, Zhejiang 315000, P.R. China
| | - Xue Wang
- Department of Urologic Surgery, Ningbo Urology and Nephrology Hospital, Ningbo, Zhejiang 315000, P.R. China
| | - Zhongguan Lou
- Department of Urologic Surgery, Ningbo Urology and Nephrology Hospital, Ningbo, Zhejiang 315000, P.R. China
| | - Shuaishuai Huang
- Department of Urologic Surgery, Ningbo Urology and Nephrology Hospital, Ningbo, Zhejiang 315000, P.R. China
| | - Haihui Zhuang
- Center for Translational Medicine, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China
| | - Yuduo Wang
- Center for Translational Medicine, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China
| | - Guobin Weng
- Department of Urologic Surgery, Ningbo Urology and Nephrology Hospital, Ningbo, Zhejiang 315000, P.R. China
| | - Ping Wang
- Center for Translational Medicine, Ningbo University School of Medicine, Ningbo, Zhejiang 315211, P.R. China
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31
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Oh MH, Lockwood WW. RASSF1A methylation, YAP1 activation and metastasis: a new role for an old foe in lung cancer. J Thorac Dis 2017; 9:1165-1167. [PMID: 28616262 DOI: 10.21037/jtd.2017.04.16] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Min Hee Oh
- Department of Integrative Oncology, British Columbia Cancer Agency, Vancouver, Canada.,Interdisciplinary Oncology Program, University of British Columbia, Vancouver, Canada
| | - William W Lockwood
- Department of Integrative Oncology, British Columbia Cancer Agency, Vancouver, Canada.,Interdisciplinary Oncology Program, University of British Columbia, Vancouver, Canada.,Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada
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32
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Nicholas NS, Pipili A, Lesjak MS, Wells CM. Differential role for PAK1 and PAK4 during the invadopodia lifecycle. Small GTPases 2017; 10:289-295. [PMID: 28301299 DOI: 10.1080/21541248.2017.1295830] [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: 01/16/2023] Open
Abstract
PAK1 and PAK4 are members of the p-21 activated kinase family of serine/threonine kinases. PAK1 has previously been implicated in both the formation and disassembly of invasive cell protrusions, termed invadopodia. We recently reported a novel role for PAK4 during invadopodia maturation and confirmed a specific role for PAK1 in invadopodia formation; findings we will review here. Moreover, we found that PAK4 induction of maturation is delivered via interaction with the RhoA regulator PDZ-RhoGEF. We can now reveal that loss of PAK4 expression leads to changes in invadopodia dynamics. Ultimately we propose that PAK4 but not PAK1 is a key mediator of RhoA activity and provide further evidence that modulation of PAK4 expression levels leads to changes in RhoA activity.
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Affiliation(s)
- Nicole S Nicholas
- a Division of Cancer Studies , New Hunts House, Guy's Campus, King's College London , London , UK.,b National Institute for Health Research (NIHR) Biomedical Research Centre, Guy's and St Thomas's Hospital and King's College London , London , UK
| | - Aikaterini Pipili
- a Division of Cancer Studies , New Hunts House, Guy's Campus, King's College London , London , UK.,b National Institute for Health Research (NIHR) Biomedical Research Centre, Guy's and St Thomas's Hospital and King's College London , London , UK
| | - Michaela S Lesjak
- a Division of Cancer Studies , New Hunts House, Guy's Campus, King's College London , London , UK
| | - Claire M Wells
- a Division of Cancer Studies , New Hunts House, Guy's Campus, King's College London , London , UK
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33
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Lovelace MD, Powter EE, Coleman PR, Zhao Y, Parker A, Chang GH, Lay AJ, Hunter J, McGrath AP, Jormakka M, Bertolino P, McCaughan G, Kavallaris M, Vadas MA, Gamble JR. The RhoGAP protein ARHGAP18/SENEX localizes to microtubules and regulates their stability in endothelial cells. Mol Biol Cell 2017; 28:1066-1078. [PMID: 28251925 PMCID: PMC5391183 DOI: 10.1091/mbc.e16-05-0285] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 02/10/2017] [Accepted: 02/17/2017] [Indexed: 11/17/2022] Open
Abstract
Localization of a regulator of RhoGTPases (ARHGAP18) is important for microtubule stability and endothelial cell function. The localization is demonstrated by advanced imaging and biochemical techniques. RhoGTPases are important regulators of the cell cytoskeleton, controlling cell shape, migration and proliferation. Previously we showed that ARHGAP18 in endothelial cells is important in cell junctions. Here we show, using structured illumination microscopy (SIM), ground-state depletion (GSD), and total internal reflection fluorescence microscopy (TIRF) that a proportion of ARHGAP18 localizes to microtubules in endothelial cells, as well as in nonendothelial cells, an association confirmed biochemically. In endothelial cells, some ARHGAP18 puncta also colocalized to Weibel–Palade bodies on the microtubules. Depletion of ARHGAP18 by small interfering RNA or analysis of endothelial cells isolated from ARHGAP18-knockout mice showed microtubule destabilization, as evidenced by altered morphology and decreased acetylated α-tubulin and glu-tubulin. The destabilization was rescued by inhibition of ROCK and histone deacetylase 6 but not by a GAP-mutant form of ARHGAP18. Depletion of ARHGAP18 resulted in a failure to secrete endothelin-1 and a reduction in neutrophil transmigration, both known to be microtubule dependent. Thrombin, a critical regulator of the Rho-mediated barrier function of endothelial cells through microtubule destabilization, enhanced the plasma membrane–bound fraction of ARHGAP18. Thus, in endothelial cells, ARHGAP18 may act as a significant regulator of vascular homeostasis.
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Affiliation(s)
- Michael D Lovelace
- Centre for the Endothelium, Vascular Biology Program, University of Sydney, Sydney, NSW 2050, Australia
| | - Elizabeth E Powter
- Centre for the Endothelium, Vascular Biology Program, University of Sydney, Sydney, NSW 2050, Australia
| | - Paul R Coleman
- Centre for the Endothelium, Vascular Biology Program, University of Sydney, Sydney, NSW 2050, Australia
| | - Yang Zhao
- Centre for the Endothelium, Vascular Biology Program, University of Sydney, Sydney, NSW 2050, Australia
| | - Amelia Parker
- Tumour Biology and Targeting Program, Children's Cancer Institute, Lowy Cancer Research Centre, University of New South Wales, Sydney, NSW 2052, Australia
| | - Garry H Chang
- Centre for the Endothelium, Vascular Biology Program, University of Sydney, Sydney, NSW 2050, Australia
| | - Angelina J Lay
- Centre for the Endothelium, Vascular Biology Program, University of Sydney, Sydney, NSW 2050, Australia
| | - Julie Hunter
- Centre for the Endothelium, Vascular Biology Program, University of Sydney, Sydney, NSW 2050, Australia
| | - Aaron P McGrath
- Structural Biology Laboratory, University of Sydney, Sydney, NSW 2050, Australia
| | - Mika Jormakka
- Structural Biology Laboratory, University of Sydney, Sydney, NSW 2050, Australia
| | - Patrick Bertolino
- Liver Immunology Laboratory, University of Sydney, Sydney, NSW 2050, Australia
| | - Geoffrey McCaughan
- Liver Biology and Cancer Laboratory, Centenary Institute, University of Sydney, Sydney, NSW 2050, Australia
| | - Maria Kavallaris
- Tumour Biology and Targeting Program, Children's Cancer Institute, Lowy Cancer Research Centre, University of New South Wales, Sydney, NSW 2052, Australia.,ARC Centre of Excellence in Convergent Bio-Nano Science and Technology and Australian Centre for NanoMedicine, University of New South Wales, Sydney, NSW 2052, Australia
| | - Mathew A Vadas
- Centre for the Endothelium, Vascular Biology Program, University of Sydney, Sydney, NSW 2050, Australia
| | - Jennifer R Gamble
- Centre for the Endothelium, Vascular Biology Program, University of Sydney, Sydney, NSW 2050, Australia
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34
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Beauchemin H, Shooshtarizadeh P, Vadnais C, Vassen L, Pastore YD, Möröy T. Gfi1b controls integrin signaling-dependent cytoskeleton dynamics and organization in megakaryocytes. Haematologica 2017; 102:484-497. [PMID: 28082345 PMCID: PMC5394960 DOI: 10.3324/haematol.2016.150375] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 01/11/2017] [Indexed: 12/27/2022] Open
Abstract
Mutations in GFI1B are associated with inherited bleeding disorders called GFI1B-related thrombocytopenias. We show here that mice with a megakaryocyte-specific Gfi1b deletion exhibit a macrothrombocytopenic phenotype along a megakaryocytic dysplasia reminiscent of GFI1B-related thrombocytopenia. GFI1B deficiency increases megakaryocyte proliferation and affects their ploidy, but also abrogates their responsiveness towards integrin signaling and their ability to spread and reorganize their cytoskeleton. Gfi1b-null megakaryocytes are also unable to form proplatelets, a process independent of integrin signaling. GFI1B-deficient megakaryocytes exhibit aberrant expression of several components of both the actin and microtubule cytoskeleton, with a dramatic reduction of α-tubulin. Inhibition of FAK or ROCK, both important for actin cytoskeleton organization and integrin signaling, only partially restored their response to integrin ligands, but the inhibition of PAK, a regulator of the actin cytoskeleton, completely rescued the responsiveness of Gfi1b-null megakaryocytes to ligands, but not their ability to form proplatelets. We conclude that Gfi1b controls major functions of megakaryocytes such as integrin-dependent cytoskeleton organization, spreading and migration through the regulation of PAK activity whereas the proplatelet formation defect in GFI1B-deficient megakaryocytes is due, at least partially, to an insufficient α-tubulin content.
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Affiliation(s)
| | | | - Charles Vadnais
- Institut de Recherches Cliniques de Montréal, IRCM, QC, Canada
| | - Lothar Vassen
- Institut de Recherches Cliniques de Montréal, IRCM, QC, Canada
| | - Yves D Pastore
- Département de Pédiatrie, Service d'Hématologie et Oncologie, CHU Ste-Justine, Montréal, QC, Canada
| | - Tarik Möröy
- Institut de Recherches Cliniques de Montréal, IRCM, QC, Canada .,Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal, QC, Canada.,Division of Experimental Medicine, McGill University, Montréal, QC, Canada
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35
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Neuert H, Yuva-Aydemir Y, Silies M, Klämbt C. Different modes of APC/C activation control growth and neuron-glia interaction in the developing Drosophila eye. Development 2017; 144:4673-4683. [DOI: 10.1242/dev.152694] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 10/23/2017] [Indexed: 12/30/2022]
Abstract
The development of the nervous system requires tight control of cell division, fate specification and migration. The anaphase promoting complex/cyclosome (APC/C) is an E3 ubiquitin ligase that affects different steps of cell cycle progression, as well as having postmitotic functions in nervous system development. It can therefore link different developmental stages in one tissue. The two adaptor proteins Fizzy/Cdc20 and Fizzy-Related/Cdh1 confer APC/C substrate specificity. Here we show that two distinct modes of APC/C function act during Drosophila eye development. Fizzy/Cdc20 controls the early growth of the eye disc anlage and the concomitant entry of glial cells onto the disc. In contrast, fzr/cdh1 acts during neuronal patterning and photoreceptor axon growth, and subsequently affects neuron-glia interaction. To further address the postmitotic role of Fzr/Cdh1 in controlling neuron-glia interaction, we identified a series of novel APC/C candidate substrates. Four of our candidate genes are required for fzr/cdh1 dependent neuron-glia interaction, including the dynein light chain Dlc90F. Taken together, our data show how different modes of APC/C activation can couple early growth and neuron-glia interaction during eye disc development.
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Affiliation(s)
- Helen Neuert
- Institut für Neurobiologie, Universität Münster, Badestr. 9, 48149 Münster, Germany
- Present address: Department of Cellular and Physiological Sciences, Life Sciences Centre, 2350 Health Sciences Mall, University of British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada
| | - Yeliz Yuva-Aydemir
- Institut für Neurobiologie, Universität Münster, Badestr. 9, 48149 Münster, Germany
- Present address: Department of Neurology, UMASS Medical School, Worcester, MA 01605, USA
| | - Marion Silies
- Institut für Neurobiologie, Universität Münster, Badestr. 9, 48149 Münster, Germany
- European Neuroscience Institute, University Medical Center Goettingen, Grisebachstr. 5, 37077 Göttingen, Germany
| | - Christian Klämbt
- Institut für Neurobiologie, Universität Münster, Badestr. 9, 48149 Münster, Germany
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36
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Numaga-Tomita T, Kitajima N, Kuroda T, Nishimura A, Miyano K, Yasuda S, Kuwahara K, Sato Y, Ide T, Birnbaumer L, Sumimoto H, Mori Y, Nishida M. TRPC3-GEF-H1 axis mediates pressure overload-induced cardiac fibrosis. Sci Rep 2016; 6:39383. [PMID: 27991560 PMCID: PMC5171702 DOI: 10.1038/srep39383] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 11/22/2016] [Indexed: 12/17/2022] Open
Abstract
Structural cardiac remodeling, accompanying cytoskeletal reorganization of cardiac cells, is a major clinical outcome of diastolic heart failure. A highly local Ca2+ influx across the plasma membrane has been suggested to code signals to induce Rho GTPase-mediated fibrosis, but it is obscure how the heart specifically decodes the local Ca2+ influx as a cytoskeletal reorganizing signal under the conditions of the rhythmic Ca2+ handling required for pump function. We found that an inhibition of transient receptor potential canonical 3 (TRPC3) channel activity exhibited resistance to Rho-mediated maladaptive fibrosis in pressure-overloaded mouse hearts. Proteomic analysis revealed that microtubule-associated Rho guanine nucleotide exchange factor, GEF-H1, participates in TRPC3-mediated RhoA activation induced by mechanical stress in cardiomyocytes and transforming growth factor (TGF) β stimulation in cardiac fibroblasts. We previously revealed that TRPC3 functionally interacts with microtubule-associated NADPH oxidase (Nox) 2, and inhibition of Nox2 attenuated mechanical stretch-induced GEF-H1 activation in cardiomyocytes. Finally, pharmacological TRPC3 inhibition significantly suppressed fibrotic responses in human cardiomyocytes and cardiac fibroblasts. These results strongly suggest that microtubule-localized TRPC3-GEF-H1 axis mediates fibrotic responses commonly in cardiac myocytes and fibroblasts induced by physico-chemical stimulation.
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Affiliation(s)
- Takuro Numaga-Tomita
- Division of Cardiocirculatory Signaling, Okazaki Institute for Integrative Bioscience (National Institute for Physiological Sciences), National Institutes of Natural Sciences, Aichi 444-8787, Japan.,Department of Physiological Sciences, SOKENDAI (School of Life Science, The Graduate University for Advanced Studies), Aichi 444-8787, Japan
| | - Naoyuki Kitajima
- Division of Cardiocirculatory Signaling, Okazaki Institute for Integrative Bioscience (National Institute for Physiological Sciences), National Institutes of Natural Sciences, Aichi 444-8787, Japan.,Department of Translational Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Takuya Kuroda
- Division of Cell-Based Therapeutic Products, National Institute of Health Sciences, Setagaya, Tokyo 158-8501, Japan
| | - Akiyuki Nishimura
- Division of Cardiocirculatory Signaling, Okazaki Institute for Integrative Bioscience (National Institute for Physiological Sciences), National Institutes of Natural Sciences, Aichi 444-8787, Japan.,Department of Physiological Sciences, SOKENDAI (School of Life Science, The Graduate University for Advanced Studies), Aichi 444-8787, Japan
| | - Kei Miyano
- Department of Biochemistry, Kyushu University Graduate School of Medical Sciences, Fukuoka 812-8582, Japan
| | - Satoshi Yasuda
- Division of Cell-Based Therapeutic Products, National Institute of Health Sciences, Setagaya, Tokyo 158-8501, Japan
| | - Koichiro Kuwahara
- Department of Cardiovascular Medicine Shinshu University School of Medicine, Nagano 390-8621, Japan
| | - Yoji Sato
- Department of Translational Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan.,Division of Cell-Based Therapeutic Products, National Institute of Health Sciences, Setagaya, Tokyo 158-8501, Japan
| | - Tomomi Ide
- Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Lutz Birnbaumer
- Laboratory of Neuroscience, NIEHS, NIH, Research Triangle Park, NC 27709, USA.,Institute for Biomedical Research (BIOMED), Catholic University of Argentina, C1107AFF Buenos Aires, Argentina
| | - Hideki Sumimoto
- Department of Biochemistry, Kyushu University Graduate School of Medical Sciences, Fukuoka 812-8582, Japan
| | - Yasuo Mori
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Motohiro Nishida
- Division of Cardiocirculatory Signaling, Okazaki Institute for Integrative Bioscience (National Institute for Physiological Sciences), National Institutes of Natural Sciences, Aichi 444-8787, Japan.,Department of Physiological Sciences, SOKENDAI (School of Life Science, The Graduate University for Advanced Studies), Aichi 444-8787, Japan.,Department of Translational Pharmaceutical Sciences, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan.,PRESTO, JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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37
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Vázquez-Prado J, Bracho-Valdés I, Cervantes-Villagrana RD, Reyes-Cruz G. Gβγ Pathways in Cell Polarity and Migration Linked to Oncogenic GPCR Signaling: Potential Relevance in Tumor Microenvironment. Mol Pharmacol 2016; 90:573-586. [DOI: 10.1124/mol.116.105338] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Accepted: 09/14/2016] [Indexed: 12/16/2022] Open
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38
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Merino-Gracia J, Zamora-Carreras H, Bruix M, Rodríguez-Crespo I. Molecular Basis for the Protein Recognition Specificity of the Dynein Light Chain DYNLT1/Tctex1: CHARACTERIZATION OF THE INTERACTION WITH ACTIVIN RECEPTOR IIB. J Biol Chem 2016; 291:20962-20975. [PMID: 27502274 DOI: 10.1074/jbc.m116.736884] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Indexed: 01/19/2023] Open
Abstract
It has been suggested that DYNLT1, a dynein light chain known to bind to various cellular and viral proteins, can function both as a molecular clamp and as a microtubule-cargo adapter. Recent data have shown that the DYNLT1 homodimer binds to two dynein intermediate chains to subsequently link cargo proteins such as the guanine nucleotide exchange factor Lfc or the small GTPases RagA and Rab3D. Although over 20 DYNLT1-interacting proteins have been reported, the exact sequence requirements that enable their association to the canonical binding groove or to the secondary site within the DYNLT1 surface are unknown. We describe herein the sequence recognition properties of the hydrophobic groove of DYNLT1 known to accommodate dynein intermediate chain. Using a pepscan approach, we have substituted each amino acid within the interacting peptide for all 20 natural amino acids and identified novel binding sequences. Our data led us to propose activin receptor IIB as a novel DYNLT1 ligand and suggest that DYNLT1 functions as a molecular dimerization engine bringing together two receptor monomers in the cytoplasmic side of the membrane. In addition, we provide evidence regarding a dual binding mode adopted by certain interacting partners such as Lfc or the parathyroid hormone receptor. Finally, we have used NMR spectroscopy to obtain the solution structure of human DYNLT1 forming a complex with dynein intermediate chain of ∼74 kDa; it is the first mammalian structure available.
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Affiliation(s)
- Javier Merino-Gracia
- From the Departamento Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain and
| | - Héctor Zamora-Carreras
- Departamento Química Física Biológica, Instituto Química Física Rocasolano, Consejo Superior de Investigaciones Científicas, Serrano 119, 28006 Madrid, Spain
| | - Marta Bruix
- Departamento Química Física Biológica, Instituto Química Física Rocasolano, Consejo Superior de Investigaciones Científicas, Serrano 119, 28006 Madrid, Spain
| | - Ignacio Rodríguez-Crespo
- From the Departamento Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain and
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39
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Reinhard NR, van Helden SF, Anthony EC, Yin T, Wu YI, Goedhart J, Gadella TWJ, Hordijk PL. Spatiotemporal analysis of RhoA/B/C activation in primary human endothelial cells. Sci Rep 2016; 6:25502. [PMID: 27147504 PMCID: PMC4857094 DOI: 10.1038/srep25502] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Accepted: 04/19/2016] [Indexed: 02/01/2023] Open
Abstract
Endothelial cells line the vasculature and are important for the regulation of blood pressure, vascular permeability, clotting and transendothelial migration of leukocytes and tumor cells. A group of proteins that that control the endothelial barrier function are the RhoGTPases. This study focuses on three homologous (>88%) RhoGTPases: RhoA, RhoB, RhoC of which RhoB and RhoC have been poorly characterized. Using a RhoGTPase mRNA expression analysis we identified RhoC as the highest expressed in primary human endothelial cells. Based on an existing RhoA FRET sensor we developed new RhoB/C FRET sensors to characterize their spatiotemporal activation properties. We found all these RhoGTPase sensors to respond to physiologically relevant agonists (e.g. Thrombin), reaching transient, localized FRET ratio changes up to 200%. These RhoA/B/C FRET sensors show localized GEF and GAP activity and reveal spatial activation differences between RhoA/C and RhoB. Finally, we used these sensors to monitor GEF-specific differential activation of RhoA/B/C. In summary, this study adds high-contrast RhoB/C FRET sensors to the currently available FRET sensor toolkit and uncover new insights in endothelial and RhoGTPase cell biology. This allows us to study activation and signaling by these closely related RhoGTPases with high spatiotemporal resolution in primary human cells.
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Affiliation(s)
- Nathalie R Reinhard
- University of Amsterdam, Molecular Cytology, Swammerdam Institute for Life Sciences, van leeuwenhoek Centre for Advanced Microscopy, Amsterdam, The Netherlands.,Sanquin Research, Molecular Cell Biology, Amsterdam, The Netherlands.,Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, The Netherlands
| | - Suzanne F van Helden
- Sanquin Research, Molecular Cell Biology, Amsterdam, The Netherlands.,Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, The Netherlands
| | - Eloise C Anthony
- Sanquin Research, Molecular Cell Biology, Amsterdam, The Netherlands.,Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, The Netherlands
| | - Taofei Yin
- Center for cell analysis and Modeling, University of Connecticut Health Center, Farmington, United States of America
| | - Yi I Wu
- Center for cell analysis and Modeling, University of Connecticut Health Center, Farmington, United States of America
| | - Joachim Goedhart
- University of Amsterdam, Molecular Cytology, Swammerdam Institute for Life Sciences, van leeuwenhoek Centre for Advanced Microscopy, Amsterdam, The Netherlands
| | - Theodorus W J Gadella
- University of Amsterdam, Molecular Cytology, Swammerdam Institute for Life Sciences, van leeuwenhoek Centre for Advanced Microscopy, Amsterdam, The Netherlands
| | - Peter L Hordijk
- University of Amsterdam, Molecular Cytology, Swammerdam Institute for Life Sciences, van leeuwenhoek Centre for Advanced Microscopy, Amsterdam, The Netherlands.,Sanquin Research, Molecular Cell Biology, Amsterdam, The Netherlands.,Landsteiner Laboratory, Academic Medical Centre, University of Amsterdam, The Netherlands
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40
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Fokin AI, Klementeva TS, Nadezhdina ES, Burakov AV. SLK/LOSK kinase regulates cell motility independently of microtubule organization and Golgi polarization. Cytoskeleton (Hoboken) 2016; 73:83-92. [PMID: 26818812 DOI: 10.1002/cm.21276] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 10/16/2015] [Accepted: 01/20/2016] [Indexed: 12/31/2022]
Abstract
Cell motility is an essential complex process that requires actin and microtubule cytoskeleton reorganization and polarization. Such extensive rearrangement is closely related to cell polarization as a whole. The serine/threonine kinase SLK/LOSK is a potential regulator of cell motility, as it phosphorylates a series of cytoskeleton-bound proteins that collectively participate in the remodeling of migratory cell architecture. In this work, we report that SLK/LOSK is an indispensable regulator of cell locomotion that primarily acts through the small GTPase RhoA and the dynactin subunit p150(Glued). Both RhoA and dynactin affect cytoskeleton organization, polarization, and general cell locomotory activity to various extents. However, it seems that these events are independent of each other. Thus, SLK/LOSK kinase effectively functions as a switch that links all of the processes underlying cell motility to provide robust directional movement.
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Affiliation(s)
- Artem I Fokin
- A.N.Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskye Gory, Moscow, 119992, Russia
| | - Tatiana S Klementeva
- Institute of Protein Research of Russian Academy of Sciences, Moscow Region, Pushchino, Institutskaya Str, 4, 142290, Russia
| | - Elena S Nadezhdina
- A.N.Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskye Gory, Moscow, 119992, Russia.,Institute of Protein Research of Russian Academy of Sciences, Moscow Region, Pushchino, Institutskaya Str, 4, 142290, Russia
| | - Anton V Burakov
- A.N.Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskye Gory, Moscow, 119992, Russia
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41
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Indu S, Sekhar SC, Sengottaiyan J, Kumar A, Pillai SM, Laloraya M, Kumar PG. Aberrant Expression of Dynein light chain 1 (DYNLT1) is Associated with Human Male Factor Infertility. Mol Cell Proteomics 2015; 14:3185-95. [PMID: 26432663 DOI: 10.1074/mcp.m115.050005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Indexed: 12/18/2022] Open
Abstract
DYNLT1 is a member of a gene family identified within the t-complex of the mouse, which has been linked with male germ cell development and function in the mouse and the fly. Though defects in the expression of this gene are associated with male sterility in both these models, there has been no study examining its association with spermatogenic defects in human males. In this study, we evaluated the levels of DYNLT1 and its expression product in the germ cells of fertile human males and males suffering from spermatogenic defects. We screened fertile (n = 14), asthenozoospermic (n = 15), oligozoospermic (n = 20) and teratozoospermic (n = 23) males using PCR and Western blot analysis. Semiquantitative PCR indicated either undetectable or significantly lower levels of expression of DYNLT1 in the germ cells from several patients from across the three infertility syndrome groups, when compared with that of fertile controls. DYNLT1 was localized on head, mid-piece, and tail segments of spermatozoa from fertile males. Spermatozoa from infertile males presented either a total absence of DYNLT1 or its absence in the tail region. Majority of the infertile individuals showed negligible levels of localization of DYNLT1 on the spermatozoa. Overexpression of DYNLT1 in GC1-spg cell line resulted in the up-regulation of several cytoskeletal proteins and molecular chaperones involved in cell cycle regulation. Defective expression of DYNLT1 was associated with male factor infertility syndromes in our study population. Proteome level changes in GC1-spg cells overexpressing DYNLT1 were suggestive of its possible function in germ cell development. We have discussed the implications of these observations in the light of the known functions of DYNLT1, which included protein trafficking, membrane vesiculation, cell cycle regulation, and stem cell differentiation.
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Affiliation(s)
- Sivankutty Indu
- From the ‡Rajiv Gandhi Centre for Biotechnology, Thycaud PO, Poojappura, Thiruvananthapuram 695 014, Kerala, India
| | - Sreeja C Sekhar
- From the ‡Rajiv Gandhi Centre for Biotechnology, Thycaud PO, Poojappura, Thiruvananthapuram 695 014, Kerala, India
| | - Jeeva Sengottaiyan
- From the ‡Rajiv Gandhi Centre for Biotechnology, Thycaud PO, Poojappura, Thiruvananthapuram 695 014, Kerala, India
| | - Anil Kumar
- From the ‡Rajiv Gandhi Centre for Biotechnology, Thycaud PO, Poojappura, Thiruvananthapuram 695 014, Kerala, India
| | - Sathy M Pillai
- §Dr. SathyPillai, Samad Hospital, V.V.Road, Pattoor, Thiruvananthapuram-695035. Kerala, India
| | - Malini Laloraya
- From the ‡Rajiv Gandhi Centre for Biotechnology, Thycaud PO, Poojappura, Thiruvananthapuram 695 014, Kerala, India
| | - Pradeep G Kumar
- From the ‡Rajiv Gandhi Centre for Biotechnology, Thycaud PO, Poojappura, Thiruvananthapuram 695 014, Kerala, India;
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Nagler M, Palkowitsch L, Rading S, Moepps B, Karsak M. Cannabinoid receptor 2 expression modulates Gβ(1)γ(2) protein interaction with the activator of G protein signalling 2/dynein light chain protein Tctex-1. Biochem Pharmacol 2015; 99:60-72. [PMID: 26410677 DOI: 10.1016/j.bcp.2015.09.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 09/22/2015] [Indexed: 11/19/2022]
Abstract
The activator of G protein signalling AGS2 (Tctex-1) forms protein complexes with Gβγ, and controls cell proliferation by regulating cell cycle progression. A direct interaction of Tctex-1 with various G protein-coupled receptors has been reported. Since the carboxyl terminal portion of CB2 carries a putative Tctex-1 binding motif, we investigated the potential interplay of CB2 and Tctex-1 in the absence and presence of Gβγ. The supposed interaction of cannabinoid receptor CB2 with Tctex-1 and the influence of CB2 on the formation of Tctex-1-Gβγ-complexes were studied by co- and/or immunoprecipitation experiments in transiently transfected HEK293 cells. The analysis on Tctex-1 protein was performed in the absence and presence of the ligands JWH 133, 2-AG, and AM 630, the protein biosynthesis inhibitor cycloheximide or the protein degradation blockers MG132, NH4Cl/leupeptin or bafilomycin. Our results show that CB2 neither directly nor indirectly via Gβγ interacts with Tctex-1, but competes with Tctex-1 in binding to Gβγ. The Tctex-1-Gβγ protein interaction was disrupted by CB2 receptor expression resulting in a release of Tctex-1 from the complex, and its degradation by the proteasome and partly by lysosomes. The decrease in Tctex-1 protein levels is induced by CB2 expression "dose-dependently" and is independent of stimulation by agonist or blocking by an inverse agonist treatment. The results suggest that CB2 receptor expression independent of its activation by agonists is sufficient to competitively disrupt Gβγ-Tctex-1 complexes, and to initiate Tctex-1 degradation. These findings implicate that CB2 receptor expression modifies the stability of intracellular protein complexes by a non-canonical pathway.
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Affiliation(s)
- Marina Nagler
- Neuronal and Cellular Signal Transduction, Center for Molecular Neurobiology Hamburg (ZMNH), University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany; Institute of Pharmacology and Toxicology, Ulm University, 89081 Ulm, Germany
| | - Lysann Palkowitsch
- Institute of Physiological Chemistry, Ulm University, 89081 Ulm, Germany
| | - Sebastian Rading
- Neuronal and Cellular Signal Transduction, Center for Molecular Neurobiology Hamburg (ZMNH), University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany; Institute of Pharmacology and Toxicology, Ulm University, 89081 Ulm, Germany
| | - Barbara Moepps
- Institute of Pharmacology and Toxicology, Ulm University, 89081 Ulm, Germany
| | - Meliha Karsak
- Neuronal and Cellular Signal Transduction, Center for Molecular Neurobiology Hamburg (ZMNH), University Medical Center Hamburg-Eppendorf (UKE), 20246 Hamburg, Germany; Institute of Pharmacology and Toxicology, Ulm University, 89081 Ulm, Germany.
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Merino-Gracia J, García-Mayoral MF, Rapali P, Valero RA, Bruix M, Rodríguez-Crespo I. DYNLT (Tctex-1) forms a tripartite complex with dynein intermediate chain and RagA, hence linking this small GTPase to the dynein motor. FEBS J 2015; 282:3945-58. [PMID: 26227614 DOI: 10.1111/febs.13388] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 07/02/2015] [Accepted: 07/28/2015] [Indexed: 12/15/2022]
Abstract
It has been suggested that DYNLT, a dynein light chain known to bind to various cellular and viral proteins, can function as a microtubule-cargo adaptor. Recent data showed that DYNLT links the small GTPase Rab3D to microtubules and, for this to occur, the DYNLT homodimer needs to display a binding site for dynein intermediate chain together with a binding site for the small GTPase. We have analysed in detail how RagA, another small GTPase, associates to DYNLT. After narrowing down the binding site of RagA to DYNLT we could identify that a β strand, part of the RagA G3 box involved in nucleotide binding, mediates this association. Interestingly, we show that both microtubule-associated DYNLT and cytoplasmic DYNLT are equally able to bind to the small GTPases Rab3D and RagA. Using NMR spectroscopy, we analysed the binding of dynein intermediate chain and RagA to mammalian DYNLT. Our experiments identify residues of DYNLT affected by dynein intermediate chain binding and residues affected by RagA binding, hence distinguishing the docking site for each of them. In summary, our results shed light on the mechanisms adopted by DYNLT when binding to protein cargoes that become transported alongside microtubules bound to the dynein motor.
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Affiliation(s)
- Javier Merino-Gracia
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Spain
| | - María Flor García-Mayoral
- Departamento de Química Biológica, Instituto de Química-Física Rocasolano, CSIC, Serrano, Madrid, Spain
| | - Peter Rapali
- Dynamics of Cell Growth and Division, Institut de Biologie Cellulaire et de Génétique, Centre National de la Recherche Scientifique, Bordeaux, France
| | - Ruth Ana Valero
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Spain
| | - Marta Bruix
- Departamento de Química Biológica, Instituto de Química-Física Rocasolano, CSIC, Serrano, Madrid, Spain
| | - Ignacio Rodríguez-Crespo
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Spain
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Huveneers S, Daemen MJAP, Hordijk PL. Between Rho(k) and a hard place: the relation between vessel wall stiffness, endothelial contractility, and cardiovascular disease. Circ Res 2015; 116:895-908. [PMID: 25722443 DOI: 10.1161/circresaha.116.305720] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Vascular stiffness is a mechanical property of the vessel wall that affects blood pressure, permeability, and inflammation. As a result, vascular stiffness is a key driver of (chronic) human disorders, including pulmonary arterial hypertension, kidney disease, and atherosclerosis. Responses of the endothelium to stiffening involve integration of mechanical cues from various sources, including the extracellular matrix, smooth muscle cells, and the forces that derive from shear stress of blood. This response in turn affects endothelial cell contractility, which is an important property that regulates endothelial stiffness, permeability, and leukocyte-vessel wall interactions. Moreover, endothelial stiffening reduces nitric oxide production, which promotes smooth muscle cell contraction and vasoconstriction. In fact, vessel wall stiffening, and microcirculatory endothelial dysfunction, precedes hypertension and thus underlies the development of vascular disease. Here, we review the cross talk among vessel wall stiffening, endothelial contractility, and vascular disease, which is controlled by Rho-driven actomyosin contractility and cellular mechanotransduction. In addition to discussing the various inputs and relevant molecular events in the endothelium, we address which actomyosin-regulated changes at cell adhesion complexes are genetically associated with human cardiovascular disease. Finally, we discuss recent findings that broaden therapeutic options for targeting this important mechanical signaling pathway in vascular pathogenesis.
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Affiliation(s)
- Stephan Huveneers
- From the Department of Molecular Cell Biology, Sanquin Research and Landsteiner Laboratory, Swammerdam Institute for Life Sciences (S.H., P.L.H.) and Department of Pathology (M.J.A.P.D.), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
| | - Mat J A P Daemen
- From the Department of Molecular Cell Biology, Sanquin Research and Landsteiner Laboratory, Swammerdam Institute for Life Sciences (S.H., P.L.H.) and Department of Pathology (M.J.A.P.D.), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Peter L Hordijk
- From the Department of Molecular Cell Biology, Sanquin Research and Landsteiner Laboratory, Swammerdam Institute for Life Sciences (S.H., P.L.H.) and Department of Pathology (M.J.A.P.D.), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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RhoGTPase signalling at epithelial tight junctions: Bridging the GAP between polarity and cancer. Int J Biochem Cell Biol 2015; 64:120-5. [PMID: 25757376 PMCID: PMC4503795 DOI: 10.1016/j.biocel.2015.02.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 02/17/2015] [Accepted: 02/26/2015] [Indexed: 01/19/2023]
Abstract
The establishment and maintenance of epithelial polarity must be correctly controlled for normal development and homeostasis. Tight junctions (TJ) in vertebrates define apical and basolateral membrane domains in polarized epithelia via bi-directional, complex signalling pathways between TJ themselves and the cytoskeleton they are associated with. RhoGTPases are central to these processes and evidence suggests that their regulation is coordinated by interactions between GEFs and GAPs with junctional, cytoplasmic adapter proteins. In this InFocus review we determine that the expression, localization or stability of a variety of these adaptor proteins is altered in various cancers, potentially representing an important mechanistic link between loss of polarity and cancer. We focus here, on two well characterized RhoGTPases Cdc42 and RhoA who's GEFs and GAPs are predominantly localized to TJ via cytoplasmic adaptor proteins.
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Smith MJ, Marshall CB, Theillet FX, Binolfi A, Selenko P, Ikura M. Real-time NMR monitoring of biological activities in complex physiological environments. Curr Opin Struct Biol 2015; 32:39-47. [PMID: 25727665 DOI: 10.1016/j.sbi.2015.02.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Revised: 02/03/2015] [Accepted: 02/05/2015] [Indexed: 11/19/2022]
Abstract
Biological reactions occur in a highly organized spatiotemporal context and with kinetics that are modulated by multiple environmental factors. To integrate these variables in our experimental investigations of 'native' biological activities, we require quantitative tools for time-resolved in situ analyses in physiologically relevant settings. Here, we outline the use of high-resolution NMR spectroscopy to directly observe biological reactions in complex environments and in real-time. Specifically, we discuss how real-time NMR (RT-NMR) methods have delineated insights into metabolic processes, post-translational protein modifications, activities of cellular GTPases and their regulators, as well as of protein folding events.
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Affiliation(s)
- Matthew J Smith
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Toronto, Ontario, Canada
| | - Christopher B Marshall
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Toronto, Ontario, Canada
| | - Francois-Xavier Theillet
- In-Cell NMR Laboratory, Department of NMR-supported Structural Biology, Leibniz Institute of Molecular Pharmacology (FMP Berlin), Berlin, Germany
| | - Andres Binolfi
- In-Cell NMR Laboratory, Department of NMR-supported Structural Biology, Leibniz Institute of Molecular Pharmacology (FMP Berlin), Berlin, Germany
| | - Philipp Selenko
- In-Cell NMR Laboratory, Department of NMR-supported Structural Biology, Leibniz Institute of Molecular Pharmacology (FMP Berlin), Berlin, Germany.
| | - Mitsuhiko Ikura
- Campbell Family Cancer Research Institute, Ontario Cancer Institute, Toronto, Ontario, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.
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RhoGTPases - A novel link between cytoskeleton organization and cisplatin resistance. Drug Resist Updat 2015; 19:22-32. [PMID: 25660168 DOI: 10.1016/j.drup.2015.01.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 01/13/2015] [Accepted: 01/18/2015] [Indexed: 12/11/2022]
Abstract
For more than three decades, platinum compounds have been the first line treatment for a wide spectrum of solid tumors. Yet, cisplatin resistance is a major impediment in cancer therapy, and deciphering the mechanisms underlying chemoresistance is crucial for the development of novel therapies with enhanced efficacy. The Rho subfamily of small GTPases plays a significant role in cancer progression, and a growing body of evidence points toward the involvement of these proteins in anticancer drug resistance, including cisplatin resistance. The cycling between active and inactive states, governed by the balance between their GEFs, GAPs and GDIs, RhoGTPases, acts as molecular switches with a pivotal role in actin cytoskeleton organization. The Rho subfamily of proteins is involved in many key cellular processes including adhesion, vesicular trafficking, proliferation, survival, cell morphology and cell-matrix interactions. Although RhoA, RhoB and RhoC are highly homologous and share some upstream regulators and downstream effectors, they each have different roles in cancer progression and chemoresistance. While RhoA and RhoC are upregulated in many tumors and can stimulate transformation, RhoB appears to exhibit tumor suppressor characteristics with proapoptotic effects. In the current review, we discuss the role of Rho subfamily of proteins in cancer, and focus on their involvement in intrinsic and acquired drug resistance.
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Fernandes V, McCormack K, Lewellyn L, Verheyen E. Integrins Regulate Apical Constriction via Microtubule Stabilization in the Drosophila Eye Disc Epithelium. Cell Rep 2014; 9:2043-55. [DOI: 10.1016/j.celrep.2014.11.041] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 10/01/2014] [Accepted: 11/24/2014] [Indexed: 01/26/2023] Open
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