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Antwi FD, Awad T, Larin M, Heesom K, Lewis P, Reddell P, Poghosyan Z, Dewitt S, Moseley R, Knäuper V. Tigilanol Tiglate-Induced Changes in Secretome Profiles Alter C-Met Phosphorylation and Cell Surface Protein Expression in H357 Head and Neck Cancer Cells. Cells 2024; 13:982. [PMID: 38891113 PMCID: PMC11171882 DOI: 10.3390/cells13110982] [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: 05/09/2024] [Revised: 05/31/2024] [Accepted: 06/01/2024] [Indexed: 06/21/2024] Open
Abstract
Tigilanol tiglate (TT, also known as EBC-46) is a novel, plant-derived diterpene ester possessing anticancer and wound-healing properties. Here, we show that TT-evoked PKC-dependent S985 phosphorylation of the tyrosine kinase MET leads to subsequent degradation of tyrosine phosphorylated p-Y1003 and p-Y1234/5 MET species. PKC inhibition with BIM-1 blocked S985 phosphorylation of MET and led to MET cell surface accumulation. Treatment with metalloproteinase inhibitors prevented MET-ECD release into cell culture media, which was also blocked by PKC inhibitors. Furthermore, unbiased secretome analysis, performed using TMT-technology, identified additional targets of TT-dependent release of cell surface proteins from H357 head and neck cancer cells. We confirm that the MET co-signalling receptor syndecan-1 was cleaved from the cell surface in response to TT treatment. This was accompanied by rapid cleavage of the cellular junction adhesion protein Nectin-1 and the nerve growth factor receptor NGFRp75/TNFR16. These findings, that TT is a novel negative regulator of protumorigenic c-MET and NGFRp75/TNFR16 signalling, as well as regulating Nectin-1-mediated cell adhesion, further contribute to our understanding of the mode of action and efficacy of TT in the treatment of solid tumours.
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Affiliation(s)
- Frank Dickson Antwi
- School of Dentistry, College of Biomedical and Life Sciences, Cardiff University, Cardiff CF14 4XY, UK (S.D.); (R.M.)
| | - Tufaha Awad
- School of Dentistry, College of Biomedical and Life Sciences, Cardiff University, Cardiff CF14 4XY, UK (S.D.); (R.M.)
| | - Meghan Larin
- School of Dentistry, College of Biomedical and Life Sciences, Cardiff University, Cardiff CF14 4XY, UK (S.D.); (R.M.)
| | - Kate Heesom
- Bristol Proteomics Facility, Biomedical Sciences Building, University Walk, University of Bristol, Bristol BS8 1TD, UK
| | - Phil Lewis
- Bristol Proteomics Facility, Biomedical Sciences Building, University Walk, University of Bristol, Bristol BS8 1TD, UK
| | | | - Zaruhi Poghosyan
- School of Medicine, College of Biomedical and Life Sciences, Cardiff University, Cardiff CF14 4XN, UK
| | - Sharon Dewitt
- School of Dentistry, College of Biomedical and Life Sciences, Cardiff University, Cardiff CF14 4XY, UK (S.D.); (R.M.)
| | - Ryan Moseley
- School of Dentistry, College of Biomedical and Life Sciences, Cardiff University, Cardiff CF14 4XY, UK (S.D.); (R.M.)
| | - Vera Knäuper
- School of Dentistry, College of Biomedical and Life Sciences, Cardiff University, Cardiff CF14 4XY, UK (S.D.); (R.M.)
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Abstract
Nectins are immunoglobulin-like cell adhesion molecules constituting a family with four members, nectin-1, nectin-2, nectin-3, and nectin-4. In the brain, nectin-2 as well as nectin-1 and nectin-3 are expressed whereas nectin-4 is hardly expressed. In the nervous system, physiological functions of nectin-1 and nectin-3, such as synapse formation, mossy fiber trajectory regulation, interneurite affinity, contextual fear memory formation, and stress-related mental disorders, have been revealed. Nectin-2 is ubiquitously expressed in non-neuronal tissues and various nectin-2 functions in non-nervous systems have been extensively investigated, but nectin-2 functions in the brain have not been revealed until recently. Recent findings have revealed that nectin-2 is expressed in the specific areas of the brain and plays important roles, such as homeostasis of astrocytes and neurons and the formation of synapses. Moreover, a single nucleotide polymorphism in the human NECTIN2 gene is associated with Alzheimer's disease. We here summarize recent progress in our understanding of nectin-2 functions in the brain.
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Kobayashi H, Seike S, Yamaguchi M, Ueda M, Takahashi E, Okamoto K, Yamanaka H. Aeromonas sobria serine protease decreases epithelial barrier function in T84 cells and accelerates bacterial translocation across the T84 monolayer in vitro. PLoS One 2019; 14:e0221344. [PMID: 31419250 PMCID: PMC6697317 DOI: 10.1371/journal.pone.0221344] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 08/05/2019] [Indexed: 01/26/2023] Open
Abstract
Aeromonas sobria is a pathogen causing food-borne illness. In immunocompromised patients and the elderly, A. sobria can leave the intestinal tract, and this opportunistically leads to severe extraintestinal diseases including sepsis, peritonitis, and meningitis. To cause such extraintestinal diseases, A. sobria must pass through the intestinal epithelial barrier. The mechanism of such bacterial translocation has not been established. Herein we used intestinal (T84) cultured cells to investigate the effect of A. sobria serine protease (ASP) on junctional complexes that maintain the intercellular adhesion of the intestinal epithelium. When several A. sobria strains were inoculated into T84 monolayer grown on Transwell inserts, the strain with higher ASP production largely decreased the value of transepithelial electrical resistance exhibited by the T84 monolayer and markedly caused bacterial translocation from the apical surface into the basolateral side of T84 monolayer. Further experiments revealed that ASP acts on adherens junctions (AJs) and causes the destruction of both nectin-2 and afadin, which are protein components constituting AJs. Other studies have not revealed the bacterial pathogenic factors that cause the destruction of both nectin-2 and afadin, and our present results thus provide the first report that the bacterial extracellular protease ASP affects these molecules. We speculate that the destruction of nectin-2 and afadin by the action of ASP increases the ability of A. sobria to pass through intestinal epithelial tissue and contributes to the severity of pathological conditions.
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Affiliation(s)
- Hidetomo Kobayashi
- Laboratory of Molecular Microbiological Science, Faculty of Pharmaceutical Sciences, Hiroshima International University, Hiroshima, Japan
| | - Soshi Seike
- Laboratory of Molecular Microbiological Science, Faculty of Pharmaceutical Sciences, Hiroshima International University, Hiroshima, Japan
| | - Masafumi Yamaguchi
- Laboratory of Physiological Chemistry, Faculty of Pharmaceutical Sciences, Hiroshima International University, Hiroshima, Japan
| | - Mitsunobu Ueda
- Laboratory of Molecular Microbiological Science, Faculty of Pharmaceutical Sciences, Hiroshima International University, Hiroshima, Japan
| | - Eizo Takahashi
- Collaborative Research Center of Okayama University for Infectious Diseases in India, National Institute of Cholera Enteric Diseases, Kolkata, India
| | - Keinosuke Okamoto
- Collaborative Research Center of Okayama University for Infectious Diseases in India, National Institute of Cholera Enteric Diseases, Kolkata, India
| | - Hiroyasu Yamanaka
- Laboratory of Molecular Microbiological Science, Faculty of Pharmaceutical Sciences, Hiroshima International University, Hiroshima, Japan
- * E-mail:
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4
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Sanz R, Ferraro GB, Fournier AE. IgLON cell adhesion molecules are shed from the cell surface of cortical neurons to promote neuronal growth. J Biol Chem 2014; 290:4330-42. [PMID: 25538237 DOI: 10.1074/jbc.m114.628438] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Matrix metalloproteinases and a disintegrin and metalloproteinases are members of the zinc endopeptidases, which cleave components of the extracellular matrix as well as cell surface proteins resulting in degradation or release of biologically active fragments. Surface ectodomain shedding affects numerous biological processes, including survival, axon outgrowth, axon guidance, and synaptogenesis. In this study, we evaluated the role of metalloproteinases in regulating cortical neurite growth. We found that treatment of mature cortical neurons with pan-metalloproteinase inhibitors or with tissue inhibitors of metalloproteinase-3 reduced neurite outgrowth. Through mass spectrometry, we characterized the metalloproteinase-sensitive cell surface proteome of mature cortical neurons. Members of the IgLON family of glycosylphosphatidylinositol-anchored neural cell adhesion molecules were identified and validated as proteins that were shed from the surface of mature cortical neurons in a metalloproteinase-dependent manner. Introduction of two members of the IgLON family, neurotrimin and NEGR1, in early embryonic neurons was sufficient to confer sensitivity to metalloproteinase inhibitors in neurite outgrowth assays. Outgrowth experiments on immobilized IgLON proteins revealed a role for all IgLON family members in promoting neurite extension from cortical neurons. Together, our findings support a role for metalloproteinase-dependent shedding of IgLON family members in regulating neurite outgrowth from mature cortical neurons.
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Affiliation(s)
- Ricardo Sanz
- From the Department of Neurology and Neurosurgery, Montréal Neurological Institute, McGill University, Montréal, Québec H3A 2B4, Canada
| | - Gino B Ferraro
- From the Department of Neurology and Neurosurgery, Montréal Neurological Institute, McGill University, Montréal, Québec H3A 2B4, Canada
| | - Alyson E Fournier
- From the Department of Neurology and Neurosurgery, Montréal Neurological Institute, McGill University, Montréal, Québec H3A 2B4, Canada
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Nava P, Kamekura R, Nusrat A. Cleavage of transmembrane junction proteins and their role in regulating epithelial homeostasis. Tissue Barriers 2014; 1:e24783. [PMID: 24665393 PMCID: PMC3879235 DOI: 10.4161/tisb.24783] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 04/19/2013] [Accepted: 04/23/2013] [Indexed: 02/07/2023] Open
Abstract
Epithelial tissues form a selective barrier that separates the external environment from the internal tissue milieu. Single epithelial cells are densely packed and associate via distinct intercellular junctions. Intercellular junction proteins not only control barrier properties of the epithelium but also play an important role in regulating epithelial homeostasis that encompasses cell proliferation, migration, differentiation and regulated shedding. Recent studies have revealed that several proteases target epithelial junction proteins during physiological maturation as well as in pathologic states such as inflammation and cancer. This review discusses mechanisms and biological consequences of transmembrane junction protein cleavage. The influence of junction protein cleavage products on pathogenesis of inflammation and cancer is discussed.
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Affiliation(s)
- Porfirio Nava
- Epithelial Pathobiology and Mucosal Inflammation Research Unit; Department of Pathology and Laboratory Medicine; Emory University School of Medicine; Atlanta, GA USA ; Department of Physiology; Biophysics and Neurosciences; Center for Research and Advanced Studies of the National Polytechnic Institute (CINVESTAV); México DF, Mexico
| | - Ryuta Kamekura
- Epithelial Pathobiology and Mucosal Inflammation Research Unit; Department of Pathology and Laboratory Medicine; Emory University School of Medicine; Atlanta, GA USA
| | - Asma Nusrat
- Epithelial Pathobiology and Mucosal Inflammation Research Unit; Department of Pathology and Laboratory Medicine; Emory University School of Medicine; Atlanta, GA USA
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Niedringhaus M, Chen X, Dzakpasu R, Conant K. MMPs and soluble ICAM-5 increase neuronal excitability within in vitro networks of hippocampal neurons. PLoS One 2012; 7:e42631. [PMID: 22912716 PMCID: PMC3418258 DOI: 10.1371/journal.pone.0042631] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Accepted: 07/09/2012] [Indexed: 12/16/2022] Open
Abstract
Matrix metalloproteinases (MMPs) are zinc-dependent endopeptidases that are released from neurons in an activity dependent manner. Published studies suggest their activity is important to varied forms of learning and memory. At least one MMP can stimulate an increase in the size of dendritic spines, structures which represent the post synaptic component for a large number of glutamatergic synapses. This change may be associated with increased synaptic glutamate receptor incorporation, and an increased amplitude and/or frequency of α-amino-3-hydroxyl-5-methyl-4-isoxazole-propionate (AMPA) mini excitatory post-synaptic currents (EPSCs). An associated increase in the probability of action potential occurrence would be expected. While the mechanism(s) by which MMPs may influence synaptic structure and function are not completely understood, MMP dependent shedding of specific cell adhesion molecules (CAMs) could play an important role. CAMs are ideally positioned to be cleaved by synaptically released MMPs, and shed N terminal domains could potentially interact with previously unengaged integrins to stimulate dendritic actin polymerization with spine expansion. In the present study, we have used multielectrode arrays (MEAs) to investigate MMP and soluble CAM dependent changes in neuronal activity recorded from hippocampal cultures. We have focused on intercellular adhesion molecule-5 (ICAM-5) in particular, as this CAM is expressed on glutamatergic dendrites and shed in an MMP dependent manner. We show that chemical long-term potentiation (cLTP) evoked changes in recorded activity, and the dynamics of action potential bursts in particular, are altered by MMP inhibition. A blocking antibody to β1 integrins has a similar effect. We also show that the ectodomain of ICAM-5 can stimulate β1 integrin dependent increases in spike counts and burst number. These results support a growing body of literature suggesting that MMPs have important effects on neuronal excitability. They also support the possibility that MMP dependent shedding of specific synaptic CAMs can contribute to these effects.
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Affiliation(s)
- Mark Niedringhaus
- Interdisciplinary Program in Neuroscience, Georgetown University Medical Center, Washington, District of Columbia, United States of America
| | - Xin Chen
- Department of Physics, Georgetown University, Washington, District of Columbia, United States of America
| | - Rhonda Dzakpasu
- Interdisciplinary Program in Neuroscience, Georgetown University Medical Center, Washington, District of Columbia, United States of America
- Department of Physics, Georgetown University, Washington, District of Columbia, United States of America
- Department of Pharmacology and Physiology, Georgetown University Medical Center, Washington, District of Columbia, United States of America
- * E-mail: (KC); (RD)
| | - Katherine Conant
- Interdisciplinary Program in Neuroscience, Georgetown University Medical Center, Washington, District of Columbia, United States of America
- Department of Neuroscience, Georgetown University Medical Center, Washington, District of Columbia, United States of America
- * E-mail: (KC); (RD)
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7
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Lim ST, Chang A, Giuliano RE, Federoff HJ. Ectodomain shedding of nectin-1 regulates the maintenance of dendritic spine density. J Neurochem 2011; 120:741-51. [PMID: 22118475 DOI: 10.1111/j.1471-4159.2011.07592.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: 11/28/2022]
Abstract
Synaptic remodeling has been postulated as a mechanism underlying synaptic plasticity and cell adhesion molecules are thought to contribute to this process. We examined the role of nectin-1 ectodomain shedding on synaptogenesis in cultured rat hippocampal neurons. Nectins are Ca(2+) -independent immunoglobulin-like adhesion molecules, involved in cell-cell adherens junctions. Herein, we show that the processing of nectin-1 occurs by multiple endoproteolytic steps both in vivo and in vitro. We identified regions containing two distinct cleavage sites within the ectodomain of nectin-1. By alanine scanning mutagenesis, two point mutations that disrupt nectin-1 ectodomain cleavage events were identified. Expression of these mutants significantly alters the density of dendritic spines. These findings suggest that ectodomain shedding of nectin-1 regulates dendritic spine density and related synaptic functions.
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Affiliation(s)
- Seung T Lim
- Neuroscience Department, Georgetown University Medical Center, Washington, District of Columbia 20057, USA
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8
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Kim J, Chang A, Dudak A, Federoff HJ, Lim ST. Characterization of nectin processing mediated by presenilin-dependent γ-secretase. J Neurochem 2011; 119:945-56. [PMID: 21910732 DOI: 10.1111/j.1471-4159.2011.07479.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nectins play an important role in forming various intercellular junctions including synapses. This role is regulated by several secretases present at intercellular junctions. We have investigated presenilin (PS)-dependent secretase-mediated processing of nectins in PS1 KO cells and primary hippocampal neurons. The loss of PS1/γ-secretase activity delayed the processing of nectin-1 and caused the accumulation of its full-length and C-terminal fragments. Over-expression of PS2 in PS1 KO cells compensated for the loss of PS1, suggesting that PS2 also has the ability to regulate nectin-1 processing. In mouse brain slices, a pronounced increase in levels of 30 and 24 kDa C-terminal fragments in response to chemical long-term potentiation was observed. The mouse brain synaptosomal fractionation study indicated that nectin-1 localized to post-synaptic and preferentially pre-synaptic membranes and that shedding occurs in both compartments. These data suggest that nectin-1 shedding and PS-dependent intramembrane cleavage occur at synapses, and is a regulated event during conditions of synaptic plasticity in the brain. Point mutation analysis identified several residues within the transmembrane domain that play a critical role in the positioning of cleavage sites by ectodomain sheddases. Nectin-3, which forms hetero-trans-dimers with nectin-1, also undergoes intramembrane cleavage mediated by PS1/γ-secretase, suggesting that PS1/γ-secreatse activity regulates synapse formation and remodeling by nectin processing.
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Affiliation(s)
- Jinsook Kim
- Department of Neuroscience, Georgetown University Medical Center, NW, Washington, District of Columbia, USA
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9
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Mizutani K, Kawano S, Minami A, Waseda M, Ikeda W, Takai Y. Interaction of nectin-like molecule 2 with integrin alpha6beta4 and inhibition of disassembly of integrin alpha6beta4 from hemidesmosomes. J Biol Chem 2011; 286:36667-76. [PMID: 21880726 DOI: 10.1074/jbc.m110.200535] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
In normal epithelial cells, integrin α(6)β(4) is abundantly expressed and forms hemidesmosomes, which is a cellular structure that mediates cell-extracellular matrix binding. In many types of cancer cells, integrin α(6)β(4) is up-regulated, laminin is cleaved, and hemidesmosomes are disrupted, eventually causing an enhancement of cancer cell movement and facilitation of their invasion. We previously showed that the immunoglobulin-like cell adhesion molecule Necl-2 (Nectin-like molecule 2), known as a tumor suppressor, inhibits cancer cell movement by suppressing the ErbB3/ErbB2 signaling. We show here that Necl-2 interacts in cis with integrin α(6)β(4). The binding of Necl-2 with integrin β(4) was mediated by its extracellular region. In human colorectal adenocarcinoma Caco-2 cells, integrin α(6)β(4) was localized at hemidesmosomes. Small interfering RNA-mediated suppression of Necl-2 expression enhanced the phorbol ester-induced disruption of the integrin α(6)β(4) complex at hemidesmosomes, whereas expression of Necl-2 suppressed the disruption of this structure. These results indicate that tumor-suppressive functions of Necl-2 are mediated by the stabilization of the hemidesmosome structure in addition to the inhibition of the ErbB3/ErbB2 signaling.
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Affiliation(s)
- Kiyohito Mizutani
- Division of Molecular and Cellular Biology, Department of Biochemistry, and Molecular Biology, Kobe University Graduate School of Medicine, Kobe 650-0017, Hyogo, Japan
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10
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Dudak A, Kim J, Cheong B, Federoff HJ, Lim ST. Membrane palmitoylated proteins regulate trafficking and processing of nectins. Eur J Cell Biol 2011; 90:365-75. [PMID: 21371776 DOI: 10.1016/j.ejcb.2011.01.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Revised: 01/07/2011] [Accepted: 01/07/2011] [Indexed: 11/25/2022] Open
Abstract
Nectins are cell-cell adhesion molecules involved in the formation of various intercellular junctions and the establishment of apical-basal polarity at cell-cell adhesion sites. To have a better understanding of the roles of nectins in the formation of cell-cell junctions, we searched for new cytoplasmic binding partners for nectin. We report that nectin-1α associates with membrane palmitoylated protein 3 (MPP3), one of the human homologues of a Drosophila tumor suppressor gene, Disc large. Two major forms of MPP3 at 66 and 98 kDa were detected, in conjunction with nectin-1α, suggesting that an association between the two may occur in various cell types. Nectin-1α recruits MPP3 to cell-cell contact sites, mediated by a PDZ-binding motif at the carboxyl terminus of nectin-1α. Association with MPP3 increases cell surface expression of nectin-1α and enhances nectin-1α ectodomain shedding, indicating that MPP3 regulates trafficking and processing of nectin-1α. Further study showed that MPP3 interacts with nectin-3α, but not with nectin-2α, showing that the association of nectins with MPP3 is isoform-specific. MPP5, another MPP family member, interacts with nectins with varying affinity and facilitates surface expression of nectin-1α, nectin-2α, and nectin-3α. These data suggest that wide interactions between nectins and MPP family members may occur in various cell-cell junctions and that these associations may regulate trafficking and processing of nectins.
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Affiliation(s)
- Amanda Dudak
- Department of Neuroscience, Georgetown University Medical Center, 3970 Reservoir Rd. NW, Washington, DC 20057, USA
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Hayashida K, Bartlett AH, Chen Y, Park PW. Molecular and cellular mechanisms of ectodomain shedding. Anat Rec (Hoboken) 2010; 293:925-37. [PMID: 20503387 DOI: 10.1002/ar.20757] [Citation(s) in RCA: 140] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The extracellular domain of several membrane-anchored proteins is released from the cell surface as soluble proteins through a regulated proteolytic mechanism called ectodomain shedding. Cells use ectodomain shedding to actively regulate the expression and function of surface molecules, and modulate a wide variety of cellular and physiological processes. Ectodomain shedding rapidly converts membrane-associated proteins into soluble effectors and, at the same time, rapidly reduces the level of cell surface expression. For some proteins, ectodomain shedding is also a prerequisite for intramembrane proteolysis, which liberates the cytoplasmic domain of the affected molecule and associated signaling factors to regulate transcription. Ectodomain shedding is a process that is highly regulated by specific agonists, antagonists, and intracellular signaling pathways. Moreover, only about 2% of cell surface proteins are released from the surface by ectodomain shedding, indicating that cells selectively shed their protein ectodomains. This review will describe the molecular and cellular mechanisms of ectodomain shedding, and discuss its major functions in lung development and disease.
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Affiliation(s)
- Kazutaka Hayashida
- Division of Respiratory Diseases, Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
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12
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Kim J, Lilliehook C, Dudak A, Prox J, Saftig P, Federoff HJ, Lim ST. Activity-dependent alpha-cleavage of nectin-1 is mediated by a disintegrin and metalloprotease 10 (ADAM10). J Biol Chem 2010; 285:22919-26. [PMID: 20501653 DOI: 10.1074/jbc.m110.126649] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Nectin-1 is known to undergo ectodomain shedding by alpha-secretase and subsequent proteolytic processing by gamma-secretase. How secretase-mediated cleavage of nectin-1 is regulated in neuronal cells and how nectin-1 cleavage affects synaptic adhesion is poorly understood. We have investigated alpha-and gamma-secretase-mediated processing of nectin-1 in primary cortical neurons and identified which protease acts as a alpha-secretase. We report here that NMDA receptor activation, but not stimulation of AMPA or metabotropic glutamate receptors, resulted in robust alpha- and gamma-secretase cleavage of nectin-1 in mature cortical neurons. Cleavage of nectin-1 required influx of Ca(2+) through the NMDA receptor, and activation of calmodulin, but was not dependent on calcium/calmodulin-dependent protein kinase II (CaMKII) activation. We found that ADAM10 is the major secretase responsible for nectin-1 ectodomain cleavage in neurons and the brain. These observations suggest that alpha- and gamma-secretase processing of nectin-1 is a Ca(2+)/calmodulin-regulated event that occurs under conditions of activity-dependent synaptic plasticity and ADAM10 and gamma-secretase are responsible for these cleavage events.
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Affiliation(s)
- Jinsook Kim
- Neuroscience Department, Georgetown University Medical Center, Washington, D. C. 20057, USA
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13
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Yura RE, Bradley SG, Ramesh G, Reeves WB, Bond JS. Meprin A metalloproteases enhance renal damage and bladder inflammation after LPS challenge. Am J Physiol Renal Physiol 2008; 296:F135-44. [PMID: 18971209 DOI: 10.1152/ajprenal.90524.2008] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Meprin metalloproteases, composed of alpha and/or beta subunits, consist of membrane-bound and secreted forms that are abundantly expressed in proximal tubules of the kidney as well as secreted into the urinary tract. Previous studies indicated that meprin metalloproteases play a role in pathological conditions such as ischemic acute renal failure and urinary tract infection. The aim of this work was to examine the role of meprins in endotoxemic acute renal failure using meprin alpha knockout (alphaKO), meprin beta knockout (betaKO), and wild-type (WT) mice. Differences among the responses of the genotypes were observed as early as 1 h after challenge with 2.5 mg/kg ip Escherichia coli LPS, establishing roles for meprins in the endotoxemic response. Meprin alphaKO mice displayed lower blood urea nitrogen levels and decreased nitric oxide levels, indicative of a decreased systemic response to LPS compared with WT and meprin betaKO mice. Serum cytokine profiles showed lower levels of IL-1beta and TNF-alpha in the meprin alphaKO mice within 3 h after LPS challenge and confirmed a role for meprins in the early phases of the host response. Meprin alphaKO mice were also hyporesponsive to LPS administered to the bladder, exhibiting significantly less bladder edema, leukocyte infiltration, and bladder permeability than WT mice. These data indicate that meprin A contributes to the renal and urogenital pathogenesis of endotoxicity.
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Affiliation(s)
- Renee E Yura
- Dept. of Biochemistry and Molecular Biology, The Pennsylvania State Univ. College of Medicine, 500 Univ. Drive, H171, Hershey, PA 17033, USA
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Mruk DD, Silvestrini B, Cheng CY. Anchoring junctions as drug targets: role in contraceptive development. Pharmacol Rev 2008; 60:146-80. [PMID: 18483144 DOI: 10.1124/pr.107.07105] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
In multicellular organisms, cell-cell interactions are mediated in part by cell junctions, which underlie tissue architecture. Throughout spermatogenesis, for instance, preleptotene leptotene spermatocytes residing in the basal compartment of the seminiferous epithelium must traverse the blood-testis barrier to enter the adluminal compartment for continued development. At the same time, germ cells must also remain attached to Sertoli cells, and numerous studies have reported extensive restructuring at the Sertoli-Sertoli and Sertoli-germ cell interface during germ cell movement across the seminiferous epithelium. Furthermore, the proteins and signaling cascades that regulate adhesion between testicular cells have been largely delineated. These findings have unveiled a number of potential "druggable" targets that can be used to induce premature release of germ cells from the seminiferous epithelium, resulting in transient infertility. Herein, we discuss a novel approach with the aim of developing a nonhormonal male contraceptive for future human use, one that involves perturbing adhesion between Sertoli and germ cells in the testis.
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Affiliation(s)
- Dolores D Mruk
- Population Council, Center for Biomedical Research, The Mary M Wohlford Laboratory for Male Contraceptive Research, 1230 York Avenue, New York, NY 10065, USA.
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15
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Ogita H, Takai Y. Cross-talk among integrin, cadherin, and growth factor receptor: roles of nectin and nectin-like molecule. ACTA ACUST UNITED AC 2008; 265:1-54. [PMID: 18275885 DOI: 10.1016/s0074-7696(07)65001-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Integrin, cadherin, and growth factor receptor are key molecules for fundamental cellular functions including cell movement, proliferation, differentiation, adhesion, and survival. These cell surface molecules cross-talk with each other in the regulation of such cellular functions. Nectin and nectin-like molecule (Necl) have been identified as cell adhesion molecules that belong to the immunoglobulin superfamily. Nectin and Necl play important roles in the integration of integrin, cadherin, and growth factor receptor at the cell-cell adhesion sites of contacting cells and at the leading edges of moving cells, and thus are also involved in the fundamental cellular functions together with integrin, cadherin, and growth factor receptor. This chapter describes how newly identified cell adhesion molecules, nectin and Necl, modulate the cross-talk among integrin, cadherin, and growth factor receptor and how these integrated molecules act in the regulation of fundamental cellular functions.
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Affiliation(s)
- Hisakazu Ogita
- Department of Molecular Biology and Biochemistry, Osaka University Graduate School of Medicine/Faculty of Medicine, Suita, Osaka 565-0871, Japan
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16
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Lim ST, Lim KC, Giuliano RE, Federoff HJ. Temporal and spatial localization of nectin-1 and l-afadin during synaptogenesis in hippocampal neurons. J Comp Neurol 2008; 507:1228-44. [PMID: 18181141 DOI: 10.1002/cne.21608] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Nectins are cell adhesion molecules that, together with the intracellular binding partner afadin, mediate adhesion and signaling at a variety of intercellular junctions. In this work we studied the distribution of nectin-1 and afadin during hippocampal synapse formation using cultured primary hippocampal neurons. Nectin-1 and afadin cluster at developing synapses between hippocampal neurons. These nectin-afadin clusters uniformly colocalize with N-cadherin-catenin pairs, suggesting that formation of developing synapses involves participation of both bimolecular systems. Nectin-1 is initially expressed at excitatory and inhibitory synapses but is progressively lost at inhibitory synapses during their maturation. Treatment of neurons with actin depolymerizing agents disrupts the synaptically localized nectin-1 and afadin cluster at an early stage and elicits nectin-1 ectodomain shedding. These data indicate that the synaptic localization of nectin-1 and l-afadin are F-actin-dependent and that the shedding of nectin-1 is a mechanism contributing to synaptic plasticity.
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Affiliation(s)
- Seung T Lim
- Department of Neurology, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
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17
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Cauwe B, Van den Steen PE, Opdenakker G. The biochemical, biological, and pathological kaleidoscope of cell surface substrates processed by matrix metalloproteinases. Crit Rev Biochem Mol Biol 2007; 42:113-85. [PMID: 17562450 DOI: 10.1080/10409230701340019] [Citation(s) in RCA: 274] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Matrix metalloproteinases (MMPs) constitute a family of more than 20 endopeptidases. Identification of specific matrix and non-matrix components as MMP substrates showed that, aside from their initial role as extracellular matrix modifiers, MMPs play significant roles in highly complex processes such as the regulation of cell behavior, cell-cell communication, and tumor progression. Thanks to the comprehensive examination of the expanded MMP action radius, the initial view of proteases acting in the soluble phase has evolved into a kaleidoscope of proteolytic reactions connected to the cell surface. Important classes of cell surface molecules include adhesion molecules, mediators of apoptosis, receptors, chemokines, cytokines, growth factors, proteases, intercellular junction proteins, and structural molecules. Proteolysis of cell surface proteins by MMPs may have extremely diverse biological implications, ranging from maturation and activation, to inactivation or degradation of substrates. In this way, modification of membrane-associated proteins by MMPs is crucial for communication between cells and the extracellular milieu, and determines cell fate and the integrity of tissues. Hence, insights into the processing of cell surface proteins by MMPs and the concomitant effects on physiological processes as well as on disease onset and evolution, leads the way to innovative therapeutic approaches for cancer, as well as degenerative and inflammatory diseases.
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Affiliation(s)
- Bénédicte Cauwe
- Rega Institute for Medical Research, Laboratory of Immunobiology, University of Leuven, Leuven, Belgium
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18
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Kansaku A, Hirabayashi S, Mori H, Fujiwara N, Kawata A, Ikeda M, Rokukawa C, Kurihara H, Hata Y. Ligand-of-Numb protein X is an endocytic scaffold for junctional adhesion molecule 4. Oncogene 2006; 25:5071-84. [PMID: 16832352 DOI: 10.1038/sj.onc.1209468] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Junctional adhesion molecule 4 (JAM4) is a cell adhesion molecule that interacts with a tight junction protein, membrane-associated guanylate kinase inverted 1 (MAGI-1). Our previous studies suggest that JAM4 is implicated in the regulation of paracellular permeability and the signalings of hepatocyte growth factor. In this study, we performed yeast two-hybrid screening to search for an unidentified JAM4-binding protein and obtained one isoform of Ligand-of-Numb protein X1 (LNX1), LNXp70, that is an interactor of Numb. Ligand-of-Numb protein X1 is expressed in kidney glomeruli and intestinal epithelial cells, where JAM4 is also detected. Immunoprecipitation from kidney lysates supports the in vivo interaction of proteins. Biochemical studies reveal that JAM4 directly binds the second PDZ domain of LNX1 through its carboxyl terminus. Junctional adhesion molecule 4, LNX1 and Numb form a tripartite complex in vitro and are partially colocalized in heterologous cells. Ligand-of-Numb protein X1 facilitates endocytosis of JAM4 and is involved in transforming growth factor beta -induced redistribution of JAM4 in mammary epithelial cells. Experiments using dominant-negative constructs and RNA interference insure that Numb is necessary for the LNX1-mediated endocytosis of JAM4. All these findings indicate that LNX1 provides an endocytic scaffold for JAM4 that is implicated in the reorganization of cell junctions.
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Affiliation(s)
- A Kansaku
- Department of Medical Biochemistry, Graduate School of Medicine, Tokyo Medical and Dental University, Yushima, Tokyo, Japan
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19
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Fabre-Lafay S, Garrido-Urbani S, Reymond N, Gonçalves A, Dubreuil P, Lopez M. Nectin-4, a new serological breast cancer marker, is a substrate for tumor necrosis factor-alpha-converting enzyme (TACE)/ADAM-17. J Biol Chem 2005; 280:19543-50. [PMID: 15784625 DOI: 10.1074/jbc.m410943200] [Citation(s) in RCA: 126] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Serum markers are extensively used in diagnostic and follow-up of cancer patients. We recently described Nectin-4, a 66-kDa adhesion molecule of the Nectin family, which is a valuable new histological and serological marker for breast carcinoma. In vivo, Nectin-4 is re-expressed in breast carcinoma, and a circulating form of Nectin-4 is detected in the sera of patients with metastatic breast cancer. In vitro, a soluble form of Nectin-4 is produced in the supernatant of breast tumor cell lines (S. Fabre-Lafay, C. Ginestier, S. Garrido-Urbani, C. Berruyer, R. Sauvan, N. Reymond, J. Adelaide, J. Geneix, P. Dubreuil, J. Jacquemier, D. Birnbaum, and M. Lopez, manuscript in preparation). We have investigated the mechanisms that regulate the production of this soluble form. It was found that the soluble form of Nectin-4 detected in the sera of patients and the supernatant of breast tumor cell lines share similar biochemical and immunological features. The soluble Nectin-4 form (43 kDa) is formed by the entire Nectin-4 ectodomain. Nectin-4 shedding is constitutive, strongly enhanced by 12-O-tetradecanoylphorbol-13-acetate activation, and reduced tumor necrosis factor-alpha protease inhibitor TAPI-1 or by the tissue inhibitor of metalloproteinase-3 (TIMP-3). TAPI-1 and TIMP-3 are inhibitors of the endoprotease tumor necrosis factor-alpha-converting enzyme (TACE)/ADAM-17. Overexpression or small interfering RNA-mediated silencing of TACE enhanced or reduced Nectin-4 shedding, respectively. Nectin-4 is not shed when expressed in TACE-deficient fibroblasts. Interestingly, the active form of TACE is overexpressed in breast tumors and may indicate that TACE is responsible for Nectin-4 shedding not only in vitro but also in vivo.
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Affiliation(s)
- Stéphanie Fabre-Lafay
- INSERM UMR 599, Cancerology Institute and Laboratoire de Pharmacologie Moléculaire, IFR 137, Cancer and Immunology Institute of Marseille, France
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20
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Martin TA, Watkins G, Mansel RE, Jiang WG. Loss of tight junction plaque molecules in breast cancer tissues is associated with a poor prognosis in patients with breast cancer. Eur J Cancer 2005; 40:2717-25. [PMID: 15571953 DOI: 10.1016/j.ejca.2004.08.008] [Citation(s) in RCA: 108] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2004] [Revised: 07/08/2004] [Accepted: 08/10/2004] [Indexed: 02/07/2023]
Abstract
The aim of this study was to investigate the expression of Zonula Occludens (ZO) proteins ZO-1, ZO-2 and ZO-3, and MUPP-1 (multi-PDZ domain protein 1), peripheral/plaque proteins that function in maintaining tight junction integrity and in transducing regulatory signalling events in patients with primary breast cancer. Breast cancer primary tumours (n=114) and background tissues (n=30) were processed for quantitative-polymerase chain reaction (PCR) analysis, Western blotting and immunostaining. Standardised transcript levels of ZO-1 and MUPP-1 were significantly lower in patients with metastatic disease compared with those remaining disease-free (DF) (median follow-up 72.2 months). Immunohistochemistry confirmed these results, with decreased levels in ZO-1 staining. For both ZO-1 and ZO-3, staining was confined to the intercellular regions in normal tissue, whereas in tumour tissues staining was diffuse and cytosolic. Q-PCR revealed a reduction in the levels of ZO-1 and MUPP-1 in patients with disease recurrence. Prognostic indicators of breast cancer were also inversely correlated with ZO-1 expression. We conclude that low levels of tight junction plaque molecules, such as ZO-1 and MUPP-1, in breast cancer are associated with poor patients prognosis.
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Affiliation(s)
- Tracey A Martin
- Metastasis and Angiogenesis Research Group, Department of Surgery, University of Wales College of Medicine, Heath Park, Cardiff, Wales CF14 4XN, UK.
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21
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Ohnishi H, Kobayashi H, Okazawa H, Ohe Y, Tomizawa K, Sato R, Matozaki T. Ectodomain Shedding of SHPS-1 and Its Role in Regulation of Cell Migration. J Biol Chem 2004; 279:27878-87. [PMID: 15123722 DOI: 10.1074/jbc.m313085200] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
SHPS-1 is a transmembrane protein whose cytoplasmic region undergoes tyrosine phosphorylation and then binds the protein-tyrosine phosphatase SHP-2. Formation of the SHPS-1-SHP-2 complex is implicated in regulation of cell migration. In addition, SHPS-1 and its ligand CD47 constitute an intercellular recognition system that contributes to inhibition of cell migration by cell-cell contact. The ectodomain of SHPS-1 has now been shown to be shed from cells in a reaction likely mediated by a metalloproteinase. This process was promoted by activation of protein kinase C or of Ras, and the released ectodomain exhibited minimal CD47-binding activity. Metalloproteinases catalyzed the cleavage of a recombinant SHPS-1-Fc fusion protein in vitro, and the primary cleavage site was localized to the juxtamembrane region of SHPS-1. Forced expression of an SHPS-1 mutant resistant to ectodomain shedding impaired cell migration, cell spreading, and reorganization of the actin cytoskeleton. It also increased the tyrosine phosphorylation of paxillin and FAK triggered by cell adhesion. These results suggest that shedding of the ectodomain of SHPS-1 plays an important role in regulation of cell migration and spreading by this protein.
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MESH Headings
- Amino Acid Sequence
- Animals
- Antigens, CD/biosynthesis
- Antigens, Differentiation/chemistry
- Antigens, Differentiation/physiology
- CD47 Antigen
- CHO Cells
- Carrier Proteins/biosynthesis
- Cell Adhesion
- Cell Line
- Cell Movement
- Concanavalin A/pharmacology
- Cricetinae
- Culture Media
- Cytoplasm/metabolism
- Cytoskeletal Proteins/metabolism
- Cytoskeleton/metabolism
- Dose-Response Relationship, Drug
- Focal Adhesion Kinase 1
- Focal Adhesion Protein-Tyrosine Kinases
- Immunoblotting
- Intracellular Signaling Peptides and Proteins
- Matrix Metalloproteinases/metabolism
- Membrane Glycoproteins/chemistry
- Membrane Glycoproteins/physiology
- Mice
- Microscopy, Fluorescence
- Molecular Sequence Data
- Mutation
- Neural Cell Adhesion Molecule L1/chemistry
- Neural Cell Adhesion Molecule L1/physiology
- Paxillin
- Peptides/chemistry
- Phosphoproteins/metabolism
- Phosphorylation
- Precipitin Tests
- Protein Binding
- Protein Kinase C/metabolism
- Protein Structure, Tertiary
- Protein Tyrosine Phosphatase, Non-Receptor Type 11
- Protein Tyrosine Phosphatases/metabolism
- Protein-Tyrosine Kinases/metabolism
- Receptors, Immunologic/chemistry
- Receptors, Immunologic/physiology
- Recombinant Fusion Proteins/metabolism
- Recombinant Proteins/metabolism
- Sequence Homology, Amino Acid
- Temperature
- Time Factors
- Tyrosine/metabolism
- ras Proteins/metabolism
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Affiliation(s)
- Hiroshi Ohnishi
- Biosignal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, 3-39-15 Showa-Machi, Maebashi, Gunma 371-8512, Japan
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22
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Cox TC. Taking it to the max: The genetic and developmental mechanisms coordinating midfacial morphogenesis and dysmorphology. Clin Genet 2004; 65:163-76. [PMID: 14756664 DOI: 10.1111/j.0009-9163.2004.00225.x] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The rapid proliferative expansion and complex morphogenetic events that coordinate the development of the face underpin the sensitivity of this structure to genetic and environmental insult and provide an explanation for the high incidence of midfacial malformation. Most notable of these malformations is cleft lip with or without cleft palate (CLP) that, with an incidence of between one in 600 and one in 1000 live births, is the fourth most common congenital disorder in humans. Despite the obvious global impact of the disorder and some recent progress in identifying causative genes for some prominent syndromal forms, our knowledge of the key genetic factors contributing to the more common isolated cases of CLP is still remarkably patchy. The current understanding of the molecular and cellular processes that orchestrate morphogenesis of the midface, with emphasis on events leading to fusion of the lip and primary palate, is detailed in this review. The roles of crucial factors identified from relevant animal model systems, including BMP4 and SHH, and the likely events perturbed by key genes pinpointed in human studies [such as PVRL1, IRF6p63, MID1, MSX1, and PTCH1] are discussed in this light. New candidates for human CLP genes are also proposed.
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Affiliation(s)
- T C Cox
- School of Molecular and Biomedical Science, University of Adelaide, Adelaide, South Australia 5005, Australia.
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Takai Y, Shimizu K, Ohtsuka T. The roles of cadherins and nectins in interneuronal synapse formation. Curr Opin Neurobiol 2003; 13:520-6. [PMID: 14630213 DOI: 10.1016/j.conb.2003.09.003] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Cadherins are Ca(2+)-dependent intercellular adhesion molecules (CAMs) and they play key roles in the intercellular junctions of a wide variety of cells, including interneuronal synapses. Nectins are Ca(2+)-independent immunoglobulin-like CAMs and they are also involved in the organization of various types of intercellular junctions, including interneuronal synapses, either in cooperation with or independently of cadherins. Intercellular adhesion through nectins induces activation of Cdc42 and Rac small G proteins, leading to a reorganization of the actin cytoskeleton, gene expression, and cell polarization.
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Affiliation(s)
- Yoshimi Takai
- Department of Molecular Biology and Biochemistry, Osaka University Graduate School of Medicine/Faculty of Medicine, Suita 565-0871, Japan.
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24
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Baury B, Masson D, McDermott BM, Jarry A, Blottière HM, Blanchardie P, Laboisse CL, Lustenberger P, Racaniello VR, Denis MG. Identification of secreted CD155 isoforms. Biochem Biophys Res Commun 2003; 309:175-82. [PMID: 12943679 DOI: 10.1016/s0006-291x(03)01560-2] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The CD155 gene is a member of the immunoglobulin superfamily. We first demonstrate the existence of soluble CD155 (sCD155) isoforms in culture medium conditioned by CD155-expressing cells, in human serum and in cerebrospinal fluid. sCD155 concentration was measured in human serum and cerebrospinal fluid using a specific ELISA. Analysis of conditioned media indicated that sCD155 release does not require protease activity. In order to determine which tissues are responsible for sCD155 expression, we have quantified CD155 mRNAs in human normal tissues. The highest expression was observed in liver. The CD155alpha transcript is the most abundant and the proportion of the CD155beta and CD155gamma variants was similar between the tissues. Finally, serum purified sCD155 reduces poliovirus entry mediated by membrane-bound CD155. The high level of CD155 synthesis in many tissues and the presence of sCD155 in biological fluids suggest the existence of an important role for the protein in cellular function.
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Affiliation(s)
- Béatrice Baury
- Institut National de la Santé et de la Recherche Médicale U539, Faculté de Médecine, 1 rue Gaston Veil, 44035 Nantes, France
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25
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Takai Y, Irie K, Shimizu K, Sakisaka T, Ikeda W. Nectins and nectin-like molecules: roles in cell adhesion, migration, and polarization. Cancer Sci 2003; 94:655-67. [PMID: 12901789 PMCID: PMC11160195 DOI: 10.1111/j.1349-7006.2003.tb01499.x] [Citation(s) in RCA: 269] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2003] [Revised: 06/26/2003] [Accepted: 06/30/2003] [Indexed: 12/16/2022] Open
Abstract
Nectins are a family of Ca(2+)-independent immunoglobulin-like cell-cell adhesion molecules consisting of four members, which homophilically and heterophilically trans-interact and cause cell-cell adhesion. Nectin-based cell-cell adhesion is involved in the formation of cadherin-based adherens junctions in epithelial cells and fibroblasts. The nectin-based cell-cell adhesion induces activation of Cdc42 and Rac small G proteins, which eventually regulate the formation of adherens junctions through reorganization of the actin cytoskeleton, gene expression through activation of a mitogen-activated protein kinase cascade, and cell polarization through cell polarity proteins. Five nectin-like molecules (necls), which have domain structures similar to those of nectins, have recently been identified and appear to play different roles from those of nectins. One of them, named necl-5, which does not homophilically trans-interact, but heterophilically trans-interacts with nectin-3, regulates cell migration and adhesion. In this article, the roles and modes of action of nectins and necls in cell adhesion, migration, and polarization are reviewed.
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Affiliation(s)
- Yoshimi Takai
- Department of Molecular Biology and Biochemistry, Osaka University Graduate School of Medicine/Faculty of Medicine, Suita 565-0871, Japan.
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