1
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Du W, Verma A, Ye Q, Du W, Lin S, Yamanaka A, Klein OD, Hu JK. Myosin II mediates Shh signals to shape dental epithelia via control of cell adhesion and movement. PLoS Genet 2024; 20:e1011326. [PMID: 38857279 PMCID: PMC11192418 DOI: 10.1371/journal.pgen.1011326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 06/21/2024] [Accepted: 05/29/2024] [Indexed: 06/12/2024] Open
Abstract
The development of ectodermal organs begins with the formation of a stratified epithelial placode that progressively invaginates into the underlying mesenchyme as the organ takes its shape. Signaling by secreted molecules is critical for epithelial morphogenesis, but how that information leads to cell rearrangement and tissue shape changes remains an open question. Using the mouse dentition as a model, we first establish that non-muscle myosin II is essential for dental epithelial invagination and show that it functions by promoting cell-cell adhesion and persistent convergent cell movements in the suprabasal layer. Shh signaling controls these processes by inducing myosin II activation via AKT. Pharmacological induction of AKT and myosin II can also rescue defects caused by the inhibition of Shh. Together, our results support a model in which the Shh signal is transmitted through myosin II to power effective cellular rearrangement for proper dental epithelial invagination.
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Affiliation(s)
- Wei Du
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
- School of Dentistry, University of California Los Angeles, Los Angeles, California, United States of America
| | - Adya Verma
- Department of Orofacial Sciences, University of California San Francisco, San Francisco, California, United States of America
| | - Qianlin Ye
- School of Dentistry, University of California Los Angeles, Los Angeles, California, United States of America
| | - Wen Du
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China
| | - Sandy Lin
- School of Dentistry, University of California Los Angeles, Los Angeles, California, United States of America
| | - Atsushi Yamanaka
- Department of Oral Anatomy and Cell Biology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Ophir D. Klein
- Department of Orofacial Sciences, University of California San Francisco, San Francisco, California, United States of America
- Department of Pediatrics, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Jimmy K. Hu
- School of Dentistry, University of California Los Angeles, Los Angeles, California, United States of America
- Molecular Biology Institute, University of California Los Angeles, Los Angeles, California, United States of America
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2
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Pan YR, Lai JCY, Huang WK, Peng PH, Jung SM, Lin SH, Chen CP, Wu CE, Hung TH, Yu AL, Wu KJ, Yeh CN. PLK1 and its substrate MISP facilitate intrahepatic cholangiocarcinoma progression by promoting lymphatic invasion and impairing E-cadherin adherens junctions. Cancer Gene Ther 2024; 31:322-333. [PMID: 38057358 PMCID: PMC10874889 DOI: 10.1038/s41417-023-00705-z] [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: 05/04/2023] [Revised: 10/25/2023] [Accepted: 11/16/2023] [Indexed: 12/08/2023]
Abstract
Intrahepatic cholangiocarcinoma (iCCA) is a subtype of CCA and has a high mortality rate and a relatively poor prognosis. However, studies focusing on increased cell motility and loss of epithelial integrity during iCCA progression remain relatively scarce. We collected seven fresh tumor samples from four patients to perform RNA sequencing (RNA-seq) and assay for transposase-accessible chromatin using sequencing (ATAC-seq) to determine the transcriptome profile and chromatin accessibility of iCCA. The increased expression of cell cycle regulators, including PLK1 and its substrate MISP, was identified. Ninety-one iCCA patients were used to validate the clinical significance of PLK1 and MISP. The upregulation of PLK1 and MISP was determined in iCCA tissues. Increased expression of PLK1 and MISP was significantly correlated with tumor number, N stage, and lymphatic invasion in an iCCA cohort. Knockdown of PLK1 or MISP reduced trans-lymphatic endothelial migration and wound healing and affected focal adhesions in vitro. In cell‒cell junctions, MISP localized to adherens junctions and suppressed E-cadherin dimerization. PLK1 disrupted adherens junctions in a myosin-dependent manner. Furthermore, PLK1 and MISP promoted cell proliferation in vitro and tumorigenesis in vivo. In iCCA, PLK1 and MISP promote aggressiveness by increasing lymphatic invasion, tumor growth, and motility through the repression of E-cadherin adherens junctions.
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Affiliation(s)
- Yi-Ru Pan
- Department of Surgery, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan
| | - Joseph Chieh-Yu Lai
- Cancer Genome Research Center, Chang Gung Memorial Hospital at Linkou, Taoyuan, 333, Taiwan
- Institute of Biomedical Sciences, China Medical University, Taichung, 404, Taiwan
| | - Wen-Kuan Huang
- Division of Hematology-Oncology, Department of Internal Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University College of Medicine, Taoyuan, 333, Taiwan
| | - Pei-Hua Peng
- Cancer Genome Research Center, Chang Gung Memorial Hospital at Linkou, Taoyuan, 333, Taiwan
| | - Shih-Ming Jung
- Department of Pathology, Chang Gung Memorial Hospital at Linkou, Taoyuan, 333, Taiwan
| | - Sheng-Hsuan Lin
- Department of Surgery, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan
| | - Chiao-Ping Chen
- Division of Hematology-Oncology, Department of Internal Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University College of Medicine, Taoyuan, 333, Taiwan
| | - Chiao-En Wu
- Division of Hematology-Oncology, Department of Internal Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University College of Medicine, Taoyuan, 333, Taiwan
| | - Tsai-Hsien Hung
- Institute of Stem Cell and Translational Cancer Research, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan
| | - Alice L Yu
- Institute of Stem Cell and Translational Cancer Research, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan
- Department of Pediatrics, University of California in San Diego, San Diego, CA, 92103, USA
| | - Kou-Juey Wu
- Cancer Genome Research Center, Chang Gung Memorial Hospital at Linkou, Taoyuan, 333, Taiwan.
| | - Chun-Nan Yeh
- Department of Surgery, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan, 333, Taiwan.
- Cancer Genome Research Center, Chang Gung Memorial Hospital at Linkou, Taoyuan, 333, Taiwan.
- School of Medicine, National Tsing Hua University, Hsinchu, 30013, Taiwan.
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3
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Ectoderm to mesoderm transition by down-regulation of actomyosin contractility. PLoS Biol 2021; 19:e3001060. [PMID: 33406067 PMCID: PMC7815211 DOI: 10.1371/journal.pbio.3001060] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 01/19/2021] [Accepted: 12/29/2020] [Indexed: 12/15/2022] Open
Abstract
Collective migration of cohesive tissues is a fundamental process in morphogenesis and is particularly well illustrated during gastrulation by the rapid and massive internalization of the mesoderm, which contrasts with the much more modest movements of the ectoderm. In the Xenopus embryo, the differences in morphogenetic capabilities of ectoderm and mesoderm can be connected to the intrinsic motility of individual cells, very low for ectoderm, high for mesoderm. Surprisingly, we find that these seemingly deep differences can be accounted for simply by differences in Rho-kinases (Rock)-dependent actomyosin contractility. We show that Rock inhibition is sufficient to rapidly unleash motility in the ectoderm and confer it with mesoderm-like properties. In the mesoderm, this motility is dependent on two negative regulators of RhoA, the small GTPase Rnd1 and the RhoGAP Shirin/Dlc2/ArhGAP37. Both are absolutely essential for gastrulation. At the cellular and tissue level, the two regulators show overlapping yet distinct functions. They both contribute to decrease cortical tension and confer motility, but Shirin tends to increase tissue fluidity and stimulate dispersion, while Rnd1 tends to favor more compact collective migration. Thus, each is able to contribute to a specific property of the migratory behavior of the mesoderm. We propose that the "ectoderm to mesoderm transition" is a prototypic case of collective migration driven by a down-regulation of cellular tension, without the need for the complex changes traditionally associated with the epithelial-to-mesenchymal transition.
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4
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Huang SC, Liang JY, Vu LV, Yu FH, Ou AC, Ou JP, Zhang HS, Burnett KM, Benz EJ. Epithelial-specific isoforms of protein 4.1R promote adherens junction assembly in maturing epithelia. J Biol Chem 2020; 295:191-211. [PMID: 31776189 PMCID: PMC6952607 DOI: 10.1074/jbc.ra119.009650] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 11/20/2019] [Indexed: 01/13/2023] Open
Abstract
Epithelial adherens junctions (AJs) and tight junctions (TJs) undergo disassembly and reassembly during morphogenesis and pathological states. The membrane-cytoskeleton interface plays a crucial role in junctional reorganization. Protein 4.1R (4.1R), expressed as a diverse array of spliceoforms, has been implicated in linking the AJ and TJ complex to the cytoskeleton. However, which specific 4.1 isoform(s) participate and the mechanisms involved in junctional stability or remodeling remain unclear. We now describe a role for epithelial-specific isoforms containing exon 17b and excluding exon 16 4.1R (4.1R+17b) in AJs. 4.1R+17b is exclusively co-localized with the AJs. 4.1R+17b binds to the armadillo repeats 1-2 of β-catenin via its membrane-binding domain. This complex is linked to the actin cytoskeleton via a bispecific interaction with an exon 17b-encoded peptide. Exon 17b peptides also promote fodrin-actin complex formation. Expression of 4.1R+17b forms does not disrupt the junctional cytoskeleton and AJs during the steady-state or calcium-dependent AJ reassembly. Overexpression of 4.1R-17b forms, which displace the endogenous 4.1R+17b forms at the AJs, as well as depletion of the 4.1R+17b forms both decrease junctional actin and attenuate the recruitment of spectrin to the AJs and also reduce E-cadherin during the initial junctional formation of the AJ reassembly process. Expressing 4.1R+17b forms in depleted cells rescues junctional localization of actin, spectrin, and E-cadherin assembly at the AJs. Together, our results identify a critical role for 4.1R+17b forms in AJ assembly and offer additional insights into the spectrin-actin-4.1R-based membrane skeleton as an emerging regulator of epithelial integrity and remodeling.
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Affiliation(s)
- Shu-Ching Huang
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115; Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts 02115; Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115.
| | - Jia Y Liang
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115
| | - Long V Vu
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115
| | - Faye H Yu
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115
| | - Alexander C Ou
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115
| | - Jennie Park Ou
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115
| | - Henry S Zhang
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115
| | - Kimberly M Burnett
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115
| | - Edward J Benz
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115; Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts 02115; Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115; Department of Pediatrics and Genetics, Harvard Medical School, Boston, Massachusetts 02115; Dana-Farber/Harvard Cancer Center, Boston, Massachusetts 02115
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5
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Chen CL, Wang SH, Chan PC, Shen MR, Chen HC. Phosphorylation of E-cadherin at threonine 790 by protein kinase Cδ reduces β-catenin binding and suppresses the function of E-cadherin. Oncotarget 2018; 7:37260-37276. [PMID: 27203386 PMCID: PMC5095074 DOI: 10.18632/oncotarget.9403] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 04/10/2016] [Indexed: 02/07/2023] Open
Abstract
Proper control of cell-cell adhesion is crucial for embryogenesis and tissue homeostasis. In this study, we show that protein kinase C (PKC)δ, a member of the novel PKC subfamily, localizes at cell-cell contacts of epithelial cells through its C2-like domain in an F-actin-dependent manner. Upon hepatocyte growth factor stimulation, PKCδ is phosphorylated and activated by Src, which then phosphorylates E-cadherin at Thr790. Phosphorylation of E-cadherin at Thr790 diminishes its interaction with β-catenin and impairs the homophilic interaction between the ectodomains of E-cadherin. The suppression of PKCδ by its dominant-negative mutants or specific short-hairpin RNA inhibits the disruption of cell-cell adhesions induced by hepatocyte growth factor. Elevated PKCδ expression in cancer cells is correlated with increased phosphorylation of E-cadherin at Thr790, reduced binding of E-cadherin to β-catenin, and poor homophilic interaction between E-cadherin. Analysis of surgical specimens confirmed that PKCδ is overexpressed in cervical cancer tissues, accompanied by increased phosphorylation of E-cadherin at Thr790. Together, our findings unveil a negative role for PKCδ in cell-cell adhesion through phosphorylation of E-cadherin.
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Affiliation(s)
- Chien-Lin Chen
- Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan
| | - Shu-Hui Wang
- Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan
| | - Po-Chao Chan
- Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan
| | - Meng-Ru Shen
- Department of Pharmacology, National Cheng Kung University, Tainan 704, Taiwan.,Department of Obstetrics and Gynecology, National Cheng Kung University Hospital, Tainan 704, Taiwan
| | - Hong-Chen Chen
- Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan.,Graduate Institute of Biomedical Sciences, National Chung Hsing University, Taichung 402, Taiwan.,Rong-Hsing Research Center for Translational Medicine, National Chung Hsing University, Taichung 402, Taiwan
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6
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Benthani FA, Herrmann D, Tran PN, Pangon L, Lucas MC, Allam AH, Currey N, Al-Sohaily S, Giry-Laterriere M, Warusavitarne J, Timpson P, Kohonen-Corish MRJ. 'MCC' protein interacts with E-cadherin and β-catenin strengthening cell-cell adhesion of HCT116 colon cancer cells. Oncogene 2017; 37:663-672. [PMID: 29035389 DOI: 10.1038/onc.2017.362] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 08/14/2017] [Accepted: 08/25/2017] [Indexed: 02/06/2023]
Abstract
E-cadherin and β-catenin are key proteins that are essential in the formation of the epithelial cell layer in the colon but their regulatory pathways that are disrupted in cancer metastasis are not completely understood. Mutated in colorectal cancer (MCC) is a tumour suppressor gene that is silenced by promoter methylation in colorectal cancer and particularly in patients with increased lymph node metastasis. Here, we show that MCC methylation is found in 45% of colon and 24% of rectal cancers and is associated with proximal colon, poorly differentiated, circumferential and mucinous tumours as well as increasing T stage and larger tumour size. Knockdown of MCC in HCT116 colon cancer cells caused a reduction in E-cadherin protein level, which is a hallmark of epithelial-mesenchymal transition in cancer, and consequently diminished the E-cadherin/β-catenin complex. MCC knockdown disrupted cell-cell adhesive strength and integrity in the dispase and transepithelial electrical resistance assays, enhanced hepatocyte growth factor-induced cell scatter and increased tumour cell invasiveness in an organotypic assay. The Src/Abl inhibitor dasatinib, a candidate anti-invasive drug, abrogated the invasive properties induced by MCC deficiency. Mechanistically, we establish that MCC interacts with the E-cadherin/β-catenin complex. These data provide a significant advance in the current understanding of cell-cell adhesion in colon cancer cells.
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Affiliation(s)
- F A Benthani
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia.,St Vincent's Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
| | - D Herrmann
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia.,St Vincent's Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
| | - P N Tran
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia.,St Vincent's Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
| | - L Pangon
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia.,St Vincent's Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
| | - M C Lucas
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
| | - A H Allam
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
| | - N Currey
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
| | - S Al-Sohaily
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
| | - M Giry-Laterriere
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
| | - J Warusavitarne
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
| | - P Timpson
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia.,St Vincent's Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
| | - M R J Kohonen-Corish
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia.,St Vincent's Clinical School, UNSW Sydney, Sydney, New South Wales, Australia.,School of Medicine, Western Sydney University, Sydney, New South Wales, Australia
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7
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Vedula P, Cruz LA, Gutierrez N, Davis J, Ayee B, Abramczyk R, Rodriguez AJ. Quantifying cadherin mechanotransduction machinery assembly/disassembly dynamics using fluorescence covariance analysis. Sci Rep 2016; 6:28822. [PMID: 27357130 PMCID: PMC4928050 DOI: 10.1038/srep28822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 06/09/2016] [Indexed: 12/27/2022] Open
Abstract
Quantifying multi-molecular complex assembly in specific cytoplasmic compartments is crucial to understand how cells use assembly/disassembly of these complexes to control function. Currently, biophysical methods like Fluorescence Resonance Energy Transfer and Fluorescence Correlation Spectroscopy provide quantitative measurements of direct protein-protein interactions, while traditional biochemical approaches such as sub-cellular fractionation and immunoprecipitation remain the main approaches used to study multi-protein complex assembly/disassembly dynamics. In this article, we validate and quantify multi-protein adherens junction complex assembly in situ using light microscopy and Fluorescence Covariance Analysis. Utilizing specific fluorescently-labeled protein pairs, we quantified various stages of adherens junction complex assembly, the multiprotein complex regulating epithelial tissue structure and function following de novo cell-cell contact. We demonstrate: minimal cadherin-catenin complex assembly in the perinuclear cytoplasm and subsequent localization to the cell-cell contact zone, assembly of adherens junction complexes, acto-myosin tension-mediated anchoring, and adherens junction maturation following de novo cell-cell contact. Finally applying Fluorescence Covariance Analysis in live cells expressing fluorescently tagged adherens junction complex proteins, we also quantified adherens junction complex assembly dynamics during epithelial monolayer formation.
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Affiliation(s)
- Pavan Vedula
- Department of Biological Sciences, Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Lissette A. Cruz
- Department of Biological Sciences, Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Natasha Gutierrez
- Department of Biological Sciences, Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Justin Davis
- Department of Biological Sciences, Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Brian Ayee
- Department of Biological Sciences, Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Rachel Abramczyk
- Department of Biological Sciences, Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Alexis J. Rodriguez
- Department of Biological Sciences, Rutgers, The State University of New Jersey, Newark, New Jersey, USA
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8
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Rötzer V, Hartlieb E, Vielmuth F, Gliem M, Spindler V, Waschke J. E-cadherin and Src associate with extradesmosomal Dsg3 and modulate desmosome assembly and adhesion. Cell Mol Life Sci 2015; 72:4885-97. [PMID: 26115704 PMCID: PMC11113844 DOI: 10.1007/s00018-015-1977-0] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Revised: 06/11/2015] [Accepted: 06/22/2015] [Indexed: 11/28/2022]
Abstract
Desmosomes provide strong intercellular cohesion essential for the integrity of cells and tissues exposed to continuous mechanical stress. For desmosome assembly, constitutively synthesized desmosomal cadherins translocate to the cell-cell border, cluster and mature in the presence of Ca(2+) to stable cell contacts. As adherens junctions precede the formation of desmosomes, we investigated in this study the relationship between the classical cadherin E-cadherin and the desmosomal cadherin Desmoglein 3 (Dsg3), the latter of which is indispensable for cell-cell adhesion in keratinocytes. By using autoantibodies from patients with the blistering skin disease pemphigus vulgaris (PV), we showed in loss of function studies that E-cadherin compensates for effects of desmosomal disassembly. Overexpression of E-cadherin reduced the loss of cell cohesion induced by PV autoantibodies and attenuated activation of p38 MAPK. Silencing of E-cadherin abolished the localization of Dsg3 at the membrane and resulted in a shift of Dsg3 from the cytoskeletal to the non-cytoskeletal protein pool which conforms to the notion that E-cadherin regulates desmosome assembly. Mechanistically, we identified a complex consisting of extradesmosomal Dsg3, E-cadherin, β-catenin and Src and that the stability of this complex is regulated by Src. Moreover, Dsg3 and E-cadherin are phosphorylated on tyrosine residues in a Src-dependent manner and Src activity is required for recruiting Dsg3 to the cytoskeletal pool as well as for desmosome maturation towards a Ca(2+)-insensitive state. Our data provide new insights into the role of E-cadherin and the contribution of Src signaling for formation and maintenance of desmosomal junctions.
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Affiliation(s)
- Vera Rötzer
- Institute of Anatomy and Cell Biology, Department I, Ludwig-Maximilians-Universität, Munich, Germany
| | - Eva Hartlieb
- Institute of Anatomy and Cell Biology, Department I, Ludwig-Maximilians-Universität, Munich, Germany
| | - Franziska Vielmuth
- Institute of Anatomy and Cell Biology, Department I, Ludwig-Maximilians-Universität, Munich, Germany
| | - Martin Gliem
- Department of Ophthalmology, University of Bonn, Bonn, Germany
| | - Volker Spindler
- Institute of Anatomy and Cell Biology, Department I, Ludwig-Maximilians-Universität, Munich, Germany.
| | - Jens Waschke
- Institute of Anatomy and Cell Biology, Department I, Ludwig-Maximilians-Universität, Munich, Germany.
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9
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Maghzal N, Kayali HA, Rohani N, Kajava AV, Fagotto F. EpCAM controls actomyosin contractility and cell adhesion by direct inhibition of PKC. Dev Cell 2013; 27:263-77. [PMID: 24183651 DOI: 10.1016/j.devcel.2013.10.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 07/03/2013] [Accepted: 10/07/2013] [Indexed: 01/06/2023]
Abstract
Epithelial cell adhesion molecule (EpCAM) is a cell-surface protein highly expressed in embryonic tissues and in malignant carcinomas. We report that EpCAM acts as a potent inhibitor of novel protein kinase C (nPKC) in both embryos and cancer cells. We observed dramatic effects of loss of EpCAM on amphibian embryonic tissues, which include sequentially strong overstimulation of PKC activity and of the Erk pathway, leading to exacerbated myosin contractility, loss of cadherin-mediated adhesion, tissue dissociation, and, ultimately, cell death. We show that PKC inhibition is caused by a short segment of the EpCAM cytoplasmic tail. This motif resembles the pseudosubstrate inhibitory domains of PKCs and binds nPKCs with high affinity. A bioinformatics search reveals the existence of similar motifs in other plasma membrane proteins, most of which are cell-cell adhesion molecules. Thus, direct inhibition of PKC by EpCAM represents a general mode of regulation of signal transduction by cell-surface proteins.
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Affiliation(s)
- Nadim Maghzal
- Department of Biology, McGill University, Montreal, H3A1B1 Quebec, Canada
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10
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Morton PE, Hicks A, Nastos T, Santis G, Parsons M. CAR regulates epithelial cell junction stability through control of E-cadherin trafficking. Sci Rep 2013; 3:2889. [PMID: 24096322 PMCID: PMC3791454 DOI: 10.1038/srep02889] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Accepted: 09/20/2013] [Indexed: 12/13/2022] Open
Abstract
CAR (Coxsackie and Adenovirus Receptor) is the primary docking receptor for typeB coxsackie viruses and subgroup C adenoviruses. CAR is a member of the JAM family of adhesion receptors and is located to both tight and adherens junctions between epithelial cells where it can assemble adhesive contacts through homodimerisation in trans. However, the role of CAR in controlling epithelial junction dynamics remains poorly understood. Here we demonstrate that levels of CAR in human epithelial cells play a key role in determining epithelial cell adhesion through control of E-cadherin stability at cell-cell junctions. Mechanistically, we show that CAR is phosphorylated within the C-terminus by PKCδ and that this in turn controls Src-dependent endocytosis of E-cadherin at cell junctions. This data demonstrates a novel role for CAR in regulating epithelial homeostasis.
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Affiliation(s)
- Penny E Morton
- 1] Division of Asthma, Allergy & Lung Biology, King's College London, 5th Floor Tower Wing, Guy's Hospital Campus, London, United Kingdom [2] Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guys Campus, London, United Kingdom
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11
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Lai JK, Wu HC, Shen YC, Hsieh HY, Yang SY, Chang CC. Krüppel-like factor 4 is involved in cell scattering induced by hepatocyte growth factor. J Cell Sci 2012; 125:4853-64. [PMID: 22854048 DOI: 10.1242/jcs.108910] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Hepatocyte growth factor/scatter factor (HGF) is unique by inducing epithelial cell scattering, a cellular event pivotal to HGF-mediated invasive-growth response essential for embryonic development and metastasis. Krüppel-like factor 4 (KLF4) is a multifunctional zinc-finger transcription factor involved in cell proliferation, differentiation and self-renewal. We herein present the first evidence for the functional connection between KLF4 and HGF-induced cell scattering. In particular, we found that KLF4 was upregulated by HGF in two independent epithelial cell types, HepG2 and MDCK, whereas KLF4 knockdown inhibited HGF-induced E-cadherin suppression and cell scattering. Moreover, enforced nuclear KLF4 expression alone was sufficient to upregulate KLF4, downregulate E-cadherin and trigger scattering. Chromatin immunoprecipitation (ChIP) analysis further revealed that KLF4 induced suppression of E-cadherin transcription by directly binding to the E-cadherin promoter. Additionally, we proved that HGF-induced upregulation of KLF4 transcription and cell scattering require activation of the MEK/ERK signaling pathway and the induction of early growth response 1 (EGR-1). At the mechanistic level, ChIP analysis validated a direct binding of EGR-1 to the KLF4 promoter to induce KLF4 transcription; in turn, EGR-1-induced KLF4 binds to its own promoter, thus creating a positive feedback mechanism to sustain KLF4 expression and the resultant cell scattering. We conclude that KLF4 upregulation by HGF represents a novel mechanism mediating HGF-induced cell scattering and perhaps other associated events such as cell migration and invasion.
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Affiliation(s)
- Jun-Kai Lai
- Institute of Biomedical Sciences, National Chung Hsing University, Taichung, Taiwan
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Phosphorylation of serine-504 of tNOX (ENOX2) modulates cell proliferation and migration in cancer cells. Exp Cell Res 2012; 318:1759-66. [DOI: 10.1016/j.yexcr.2012.04.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2012] [Revised: 04/25/2012] [Accepted: 04/29/2012] [Indexed: 12/15/2022]
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Regulation of adherens junction dynamics by phosphorylation switches. JOURNAL OF SIGNAL TRANSDUCTION 2012; 2012:125295. [PMID: 22848810 PMCID: PMC3403498 DOI: 10.1155/2012/125295] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 05/21/2012] [Accepted: 05/22/2012] [Indexed: 12/15/2022]
Abstract
Adherens junctions connect the actin cytoskeleton of neighboring cells through transmembrane cadherin receptors and a network of adaptor proteins. The interactions between these adaptors and cadherin as well as the activity of actin regulators localized to adherens junctions are tightly controlled to facilitate cell junction assembly or disassembly in response to changes in external or internal forces and/or signaling. Phosphorylation of tyrosine, serine, or threonine residues acts as a switch on the majority of adherens junction proteins, turning "on" or "off" their interactions with other proteins and/or their enzymatic activity. Here, we provide an overview of the kinases and phosphatases regulating phosphorylation of adherens junction proteins and bring examples of phosphorylation events leading to the assembly or disassembly of adherens junctions, highlighting the important role of phosphorylation switches in regulating their dynamics.
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Chen CL, Lin YP, Lai YC, Chen HC. α-Adducin translocates to the nucleus upon loss of cell-cell adhesions. Traffic 2011; 12:1327-40. [PMID: 21736685 DOI: 10.1111/j.1600-0854.2011.01245.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The F-actin binding protein adducin plays an important role in plasma membrane stability, cell motility and cell-cell junctions. In this study, we demonstrate that α-adducin is mainly localized in the nucleus of sparsely cultured epithelial cells, whereas it is localized at cell-cell junctions when the cells are grown to confluence. Disruption of cell-cell adhesions induces a nuclear translocation of α-adducin. Conversely, α-adducin is redistributed to the cytoplasm and cell-cell junctions in the process of establishing cell-cell adhesions. We identify that α-adducin contains a bipartite nuclear localization signal (NLS) in its COOH-terminal tail domain and a nuclear export signal in its neck region. The phosphorylation of α-adducin at Ser716 that is immediately adjacent to the NLS appears to antagonize the function of the NLS. Moreover, we show that depletion of α-adducin has adverse effects on cell-cell adhesions and, to our surprise, cell proliferation. The impaired cell proliferation is associated with mitotic defects characterized by disorganized mitotic spindles, aberrant chromosomal congregation/segregation and abnormal centrosomes. Taken together, our results not only reveal the mechanism for α-adducin to shuttle between the cytoplasm and nucleus, but also highlight a potential role for α-adducin in mitosis.
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Affiliation(s)
- Chien-Lin Chen
- Department of Life Sciences, National Chung Hsing University, Taichung, Taiwan
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Chen CL, Chan PC, Wang SH, Pan YR, Chen HC. Elevated expression of protein kinase C delta induces cell scattering upon serum deprivation. J Cell Sci 2010; 123:2901-13. [PMID: 20682636 DOI: 10.1242/jcs.069765] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Tumor metastasis might be evoked in response to microenvironmental stress, such as a shortage of oxygen. Although the cellular response to hypoxia has been well established, we know little about how tumors adapt themselves to deprivation of growth factor. Protein kinase Cdelta (PKCdelta), a stress-sensitive protein kinase, has been implicated in tumor progression. In this study, we demonstrate that elevated expression of PKCdelta in Madin-Darby canine kidney cells induces a scatter response upon serum starvation, a condition that mimics growth-factor deprivation. Serum starvation stimulates the catalytic activity and Y311 phosphorylation of PKCdelta through reactive oxygen species (ROS) and the Src family kinases. Mutation of PKCdelta at Y311 and Y322, both of which are phosphorylation sites for Src, impairs its activation and ability to promote cell scattering upon serum deprivation. Once activated by ROS, PKCdelta itself activates ROS production at least partially through NADPH oxidase. In addition, the c-Jun N-terminal kinase is identified as a crucial downstream mediator of ROS and PKCdelta for induction of cell scattering upon serum deprivation. We demonstrate that the C1B domain of PKCdelta is essential not only for its localization at the Golgi complex, but also for its activation and ability to induce cell scattering upon serum deprivation. Finally, depletion of PKCdelta in human bladder carcinoma T24 cells restores their cell-cell contacts, which thereby reverses a scattered growth pattern to an epithelial-like growth pattern. Collectively, our results suggest that elevated expression of PKCdelta might facilitate the scattering of cells in order to escape stress induced by growth-factor deprivation.
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Affiliation(s)
- Chien-Lin Chen
- Department of Life Science, National Chung Hsing University, Taichung, 40227, Taiwan
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