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Hennigan RF, Fletcher JS, Guard S, Ratner N. Proximity biotinylation identifies a set of conformation-specific interactions between Merlin and cell junction proteins. Sci Signal 2019; 12:12/578/eaau8749. [PMID: 31015291 DOI: 10.1126/scisignal.aau8749] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Neurofibromatosis type 2 is an inherited, neoplastic disease associated with schwannomas, meningiomas, and ependymomas and that is caused by inactivation of the tumor suppressor gene NF2 The NF2 gene product, Merlin, has no intrinsic catalytic activity; its tumor suppressor function is mediated through the proteins with which it interacts. We used proximity biotinylation followed by mass spectrometry and direct binding assays to identify proteins that associated with wild-type and various mutant forms of Merlin in immortalized Schwann cells. We defined a set of 52 proteins in close proximity to wild-type Merlin. Most of the Merlin-proximal proteins were components of cell junctional signaling complexes, suggesting that additional potential interaction partners may exist in adherens junctions, tight junctions, and focal adhesions. With mutant forms of Merlin that cannot bind to phosphatidylinositol 4,5-bisphosphate (PIP2) or that constitutively adopt a closed conformation, we confirmed a critical role for PIP2 binding in Merlin function and identified a large cohort of proteins that specifically interacted with Merlin in the closed conformation. Among these proteins, we identified a previously unreported Merlin-binding protein, apoptosis-stimulated p53 protein 2 (ASPP2, also called Tp53bp2), that bound to closed-conformation Merlin predominately through the FERM domain. Our results demonstrate that Merlin is a component of cell junctional mechanosensing complexes and defines a specific set of proteins through which it acts.
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Affiliation(s)
- Robert F Hennigan
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital, Cincinnati, OH 45229, USA.
| | - Jonathan S Fletcher
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital, Cincinnati, OH 45229, USA
| | - Steven Guard
- Department of Molecular, Cellular & Developmental Biology, University of Colorado Boulder, Boulder, CO 80309, USA
| | - Nancy Ratner
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital, Cincinnati, OH 45229, USA
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2
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Rübsam M, Broussard JA, Wickström SA, Nekrasova O, Green KJ, Niessen CM. Adherens Junctions and Desmosomes Coordinate Mechanics and Signaling to Orchestrate Tissue Morphogenesis and Function: An Evolutionary Perspective. Cold Spring Harb Perspect Biol 2018; 10:a029207. [PMID: 28893859 PMCID: PMC6211388 DOI: 10.1101/cshperspect.a029207] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Cadherin-based adherens junctions (AJs) and desmosomes are crucial to couple intercellular adhesion to the actin or intermediate filament cytoskeletons, respectively. As such, these intercellular junctions are essential to provide not only integrity to epithelia and other tissues but also the mechanical machinery necessary to execute complex morphogenetic and homeostatic intercellular rearrangements. Moreover, these spatially defined junctions serve as signaling hubs that integrate mechanical and chemical pathways to coordinate tissue architecture with behavior. This review takes an evolutionary perspective on how the emergence of these two essential intercellular junctions at key points during the evolution of multicellular animals afforded metazoans with new opportunities to integrate adhesion, cytoskeletal dynamics, and signaling. We discuss known literature on cross-talk between the two junctions and, using the skin epidermis as an example, provide a model for how these two junctions function in concert to orchestrate tissue organization and function.
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Affiliation(s)
- Matthias Rübsam
- University of Cologne, Department of Dermatology, Cologne Excellence Cluster on Stress Responses in Aging Associated Diseases (CECAD), Center for Molecular Medicine Cologne (CMMC) at the CECAD Research Center, 50931 Cologne, Germany
| | - Joshua A Broussard
- Northwestern University Feinberg School of Medicine, Departments of Pathology and Dermatology, the Robert H Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois 60611
| | - Sara A Wickström
- Paul Gerson Unna Group, Skin Homeostasis and Ageing, Max Planck Institute for Biology of Ageing, 50931 Cologne, Germany
| | - Oxana Nekrasova
- Northwestern University Feinberg School of Medicine, Departments of Pathology and Dermatology, the Robert H Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois 60611
| | - Kathleen J Green
- Northwestern University Feinberg School of Medicine, Departments of Pathology and Dermatology, the Robert H Lurie Comprehensive Cancer Center of Northwestern University, Chicago, Illinois 60611
| | - Carien M Niessen
- University of Cologne, Department of Dermatology, Cologne Excellence Cluster on Stress Responses in Aging Associated Diseases (CECAD), Center for Molecular Medicine Cologne (CMMC) at the CECAD Research Center, 50931 Cologne, Germany
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Bai H, Zhu Q, Surcel A, Luo T, Ren Y, Guan B, Liu Y, Wu N, Joseph NE, Wang TL, Zhang N, Pan D, Alpini G, Robinson DN, Anders RA. Yes-associated protein impacts adherens junction assembly through regulating actin cytoskeleton organization. Am J Physiol Gastrointest Liver Physiol 2016; 311:G396-411. [PMID: 27229120 PMCID: PMC5076009 DOI: 10.1152/ajpgi.00027.2016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 05/11/2016] [Indexed: 01/31/2023]
Abstract
The Hippo pathway effector Yes-associated protein (YAP) regulates liver size by promoting cell proliferation and inhibiting apoptosis. However, recent in vivo studies suggest that YAP has important cellular functions other than controlling proliferation and apoptosis. Transgenic YAP expression in mouse hepatocytes results in severe jaundice. A possible explanation for the jaundice could be defects in adherens junctions that prevent bile from leaking into the blood stream. Indeed, immunostaining of E-cadherin and electron microscopic examination of bile canaliculi of Yap transgenic livers revealed abnormal adherens junction structures. Using primary hepatocytes from Yap transgenic livers and Yap knockout livers, we found that YAP antagonizes E-cadherin-mediated cell-cell junction assembly by regulating the cellular actin architecture, including its mechanical properties (elasticity and cortical tension). Mechanistically, we found that YAP promoted contractile actin structure formation by upregulating nonmuscle myosin light chain expression and cellular ATP generation. Thus, by modulating actomyosin organization, YAP may influence many actomyosin-dependent cellular characteristics, including adhesion, membrane protrusion, spreading, morphology, and cortical tension and elasticity, which in turn determine cell differentiation and tissue morphogenesis.
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Affiliation(s)
- Haibo Bai
- 1Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland;
| | - Qingfeng Zhu
- 2Institute of Biomedical Sciences (IBS), Fudan University, Shanghai, People's Republic of China; and Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland;
| | - Alexandra Surcel
- 3Department of Cell Biology, Johns Hopkins School of Medicine, Baltimore, Maryland;
| | - Tianzhi Luo
- 3Department of Cell Biology, Johns Hopkins School of Medicine, Baltimore, Maryland;
| | - Yixin Ren
- 3Department of Cell Biology, Johns Hopkins School of Medicine, Baltimore, Maryland;
| | - Bin Guan
- 1Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland;
| | - Ying Liu
- 1Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland;
| | - Nan Wu
- 6Research, Central Texas Veterans Health Care System, Temple, Texas; Department of Medicine, Division of Gastroenterology, Texas A&M Health Science Center College of Medicine, Temple, Texas; and Baylor Scott & White Health Digestive Disease Research Center, Temple, Texas
| | - Nora Eve Joseph
- 5Department of Pathology, University of Chicago, Chicago, Illinois; and
| | - Tian -Li Wang
- 1Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland;
| | - Nailing Zhang
- 4Department of Molecular Biology and Genetics, Howard Hughes Medical Institute, Johns Hopkins School of Medicine, Baltimore, Maryland;
| | - Duojia Pan
- 4Department of Molecular Biology and Genetics, Howard Hughes Medical Institute, Johns Hopkins School of Medicine, Baltimore, Maryland;
| | - Gianfranco Alpini
- 6Research, Central Texas Veterans Health Care System, Temple, Texas; Department of Medicine, Division of Gastroenterology, Texas A&M Health Science Center College of Medicine, Temple, Texas; and Baylor Scott & White Health Digestive Disease Research Center, Temple, Texas
| | - Douglas N. Robinson
- 3Department of Cell Biology, Johns Hopkins School of Medicine, Baltimore, Maryland;
| | - Robert A. Anders
- 1Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland;
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Lee M, Ji H, Furuta Y, Park JI, McCrea PD. p120-catenin regulates REST and CoREST, and modulates mouse embryonic stem cell differentiation. J Cell Sci 2014; 127:4037-51. [PMID: 25074806 DOI: 10.1242/jcs.151944] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Although the canonical Wnt pathway and β-catenin have been extensively studied, less is known about the role of p120-catenin (also known as δ1-catenin) in the nuclear compartment. Here, we report that p120-catenin binds and negatively regulates REST and CoREST (also known as Rcor1), a repressive transcriptional complex that has diverse developmental and pathological roles. Using mouse embryonic stem cells (mESCs), mammalian cell lines, Xenopus embryos and in vitro systems, we find that p120-catenin directly binds the REST-CoREST complex, displacing it from established gene targets to permit their transcriptional activation. Importantly, p120-catenin levels further modulate the mRNA and protein levels of Oct4 (also known as POU5F1), Nanog and Sox2, and have an impact upon the differentiation of mESCs towards neural fates. In assessing potential upstream inputs to this new p120-catenin-REST-CoREST pathway, REST gene targets were found to respond to the level of E-cadherin, with evidence suggesting that p120-catenin transduces signals between E-cadherin and the nucleus. In summary, we provide the first evidence for a direct upstream modulator and/or pathway regulating REST-CoREST, and reveal a substantial role for p120-catenin in the modulation of stem cell differentiation.
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Affiliation(s)
- Moonsup Lee
- Department of Biochemistry and Molecular Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA Program in Genes and Development, The University of Texas Graduate School of Biomedical Science-Houston, Houston, TX 77030, USA
| | - Hong Ji
- Department of Biochemistry and Molecular Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Yasuhide Furuta
- Laboratory for Animal Resources and Genetic Engineering, Riken Center for Developmental Biology, 2-2-3 Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Jae-il Park
- Department of Experimental Radiation Oncology, Division of Radiation Oncology, The University of Texas M D Anderson Cancer Center, Houston, TX 77030, USA
| | - Pierre D McCrea
- Department of Biochemistry and Molecular Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA Program in Genes and Development, The University of Texas Graduate School of Biomedical Science-Houston, Houston, TX 77030, USA
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Baumgartner W. Possible roles of LI-Cadherin in the formation and maintenance of the intestinal epithelial barrier. Tissue Barriers 2014; 1:e23815. [PMID: 24665380 PMCID: PMC3879124 DOI: 10.4161/tisb.23815] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Revised: 01/29/2013] [Accepted: 01/29/2013] [Indexed: 02/07/2023] Open
Abstract
LI-cadherin belongs to the so called 7D-cadherins, exceptional members of the cadherin superfamily which are characterized by seven extracellular cadherin repeats and a small cytosolic domain. Under physiological conditions LI-cadherin is expressed in the intestine and colon in human and mouse and in the rat also in hepatocytes. LI-cadherin was shown to act as a functional Ca2+-dependent adhesion molecule, linking neighboring cells and a lot of biophysical and biochemical parameters were determined in the last time. It is also known that dysregulated LI-cadherin expression can be found in a variety of diseases. Although there are several hypothesis and theoretical models concerning the function of LI-cadherin, the physiological role of LI-cadherin is still enigmatic.
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Affiliation(s)
- Werner Baumgartner
- Department of Cellular Neurobionics; RWTH-Aachen University; Aachen; Germany
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Adherens junction distribution mechanisms during cell-cell contact elongation in Drosophila. PLoS One 2013; 8:e79613. [PMID: 24223978 PMCID: PMC3817131 DOI: 10.1371/journal.pone.0079613] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 09/29/2013] [Indexed: 01/13/2023] Open
Abstract
During Drosophila gastrulation, amnioserosa (AS) cells flatten and spread as an epithelial sheet. We used AS morphogenesis as a model to investigate how adherens junctions (AJs) distribute along elongating cell-cell contacts in vivo. As the contacts elongated, total AJ protein levels increased along their length. However, genetically blocking this AJ addition indicated that it was not essential for maintaining AJ continuity. Implicating other remodeling mechanisms, AJ photobleaching revealed non-directional lateral mobility of AJs along the elongating contacts, as well as local AJ removal from the membranes. Actin stabilization with jasplakinolide reduced AJ redistribution, and live imaging of myosin II along elongating contacts revealed fragmented, expanding and contracting actomyosin networks, suggesting a mechanism for lateral AJ mobility. Actin stabilization also increased total AJ levels, suggesting an inhibition of AJ removal. Implicating AJ removal by endocytosis, clathrin endocytic machinery accumulated at AJs. However, dynamin disruption had no apparent effect on AJs, suggesting the involvement of redundant or dynamin-independent mechanisms. Overall, we propose that new synthesis, lateral diffusion, and endocytosis play overlapping roles to populate elongating cell-cell contacts with evenly distributed AJs in this in vivo system.
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Abstract
Emerin, a conserved LEM-domain protein, is among the few nuclear membrane proteins for which extensive basic knowledge—biochemistry, partners, functions, localizations, posttranslational regulation, roles in development and links to human disease—is available. This review summarizes emerin and its emerging roles in nuclear “lamina” structure, chromatin tethering, gene regulation, mitosis, nuclear assembly, development, signaling and mechano-transduction. We also highlight many open questions, exploration of which will be critical to understand how this intriguing nuclear membrane protein and its “family” influence the genome.
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Affiliation(s)
- Jason M Berk
- Department of Cell Biology; Johns Hopkins University School of Medicine; Baltimore, MD USA
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An introduction to adherens junctions: from molecular mechanisms to tissue development and disease. Subcell Biochem 2012; 60:1-5. [PMID: 22674065 DOI: 10.1007/978-94-007-4186-7_1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Adherens junctions (AJs) are fundamental for the development of animal tissues and organs. The core complex is formed from transmembrane cell-cell adhesion molecules, cadherins, and adaptor molecules, the catenins, that link to cytoskeletal and regulatory networks within the cell. This complex can be considered over a wide range of biological organization, from atoms to molecules, protein complexes, molecular networks, cells, tissues, and overall animal development. AJs have also been an integral part of animal evolution, and play central roles in cancer development and pathogen infection. This book addresses major questions encompassing these aspects of AJ biology. How did AJs evolve? How do the cadherins and catenins interact to assemble AJs and mediate adhesion? How do AJs interface with other cellular machinery to couple adhesion with the whole cell? How do AJs affect cell behaviour and multicellular development? How can abnormal AJ activity lead to disease?
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