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Herrera-Pariente C, Bonjoch L, Muñoz J, Fernàndez G, Soares de Lima Y, Mahmood R, Cuatrecasas M, Ocaña T, Lopez-Prades S, Llargués-Sistac G, Domínguez-Rovira X, Llach J, Luzko I, Díaz-Gay M, Lazaro C, Brunet J, Castillo-Manzano C, García-González MA, Lanas A, Carrillo M, Hernández San Gil R, Quintero E, Sala N, Llort G, Aguilera L, Carot L, Diez-Redondo P, Jover R, Ramon Y Cajal T, Cubiella J, Castells A, Balaguer F, Bujanda L, Castellví-Bel S, Moreira L. CTNND1 is involved in germline predisposition to early-onset gastric cancer by affecting cell-to-cell interactions. Gastric Cancer 2024; 27:747-759. [PMID: 38796558 PMCID: PMC11193828 DOI: 10.1007/s10120-024-01504-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Accepted: 04/20/2024] [Indexed: 05/28/2024]
Abstract
BACKGROUND CDH1 and CTNNA1 remain as the main genes for hereditary gastric cancer. However, they only explain a small fraction of gastric cancer cases with suspected inherited basis. In this study, we aimed to identify new hereditary genes for early-onset gastric cancer patients (EOGC; < 50 years old). METHODS After germline exome sequencing in 20 EOGC patients and replication of relevant findings by gene-panel sequencing in an independent cohort of 152 patients, CTNND1 stood out as an interesting candidate gene, since its protein product (p120ctn) directly interacts with E-cadherin. We proceeded with functional characterization by generating two knockout CTNND1 cellular models by gene editing and introducing the detected genetic variants using a lentiviral delivery system. We assessed β-catenin and E-cadherin levels, cell detachment, as well as E-cadherin localization and cell-to-cell interaction by spheroid modeling. RESULTS Three CTNND1 germline variants [c.28_29delinsCT, p.(Ala10Leu); c.1105C > T, p.(Pro369Ser); c.1537A > G, p.(Asn513Asp)] were identified in our EOGC cohorts. Cells encoding CTNND1 variants displayed altered E-cadherin levels and intercellular interactions. In addition, the p.(Pro369Ser) variant, located in a key region in the E-cadherin/p120ctn binding domain, showed E-cadherin mislocalization. CONCLUSIONS Defects in CTNND1 could be involved in germline predisposition to gastric cancer by altering E-cadherin and, consequently, cell-to-cell interactions. In the present study, CTNND1 germline variants explained 2% (3/172) of the cases, although further studies in larger external cohorts are needed.
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Affiliation(s)
- Cristina Herrera-Pariente
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Laia Bonjoch
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Jenifer Muñoz
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | | | - Yasmin Soares de Lima
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Romesa Mahmood
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Miriam Cuatrecasas
- Pathology, Hospital Clínic, FRCB-IDIBAPS, CIBEREHD, 08036, Barcelona, Spain
| | - Teresa Ocaña
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | | | - Gemma Llargués-Sistac
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Xavier Domínguez-Rovira
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Joan Llach
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Irina Luzko
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Marcos Díaz-Gay
- Department of Cellular and Molecular Medicine and Department of Bioengineering and Moores Cancer Center, UC San Diego, La Jolla, San Diego, CA, 92093, USA
| | - Conxi Lazaro
- Hereditary Cancer Program, Catalan Institute of Oncology, IDIBELL, CIBERONC, 08908, Barcelona, Spain
| | - Joan Brunet
- Hereditary Cancer Program, Catalan Institute of Oncology, IDIBELL, CIBERONC, 08908, Barcelona, Spain
- Hereditary Cancer Program, Catalan Institute of Oncology, IDIBGI, 17190, Girona, Spain
| | | | - María Asunción García-González
- Instituto de Investigación Sanitaria Aragón, Instituto Aragonés de Ciencias de La Salud, CIBEREHD, 50009, Zaragoza, Spain
| | - Angel Lanas
- Instituto de Investigación Sanitaria Aragón, Instituto Aragonés de Ciencias de La Salud, CIBEREHD, 50009, Zaragoza, Spain
- Gastroenterology, Hospital Clínico Universitario de Zaragoza, Instituto de Investigación Sanitaria Aragón, Universidad de Zaragoza, CIBEREHD, 50009, Zaragoza, Spain
| | - Marta Carrillo
- Gastroenterology, Centro de Investigación Biomédica de Canarias (CIBICAN), Hospital Universitario de Canarias, Instituto Universitario de Tecnologías Biomédicas (ITB), Universidad de La Laguna, 38320, Santa Cruz de Tenerife, Spain
| | | | - Enrique Quintero
- Gastroenterology, Centro de Investigación Biomédica de Canarias (CIBICAN), Hospital Universitario de Canarias, Instituto Universitario de Tecnologías Biomédicas (ITB), Universidad de La Laguna, 38320, Santa Cruz de Tenerife, Spain
| | - Nuria Sala
- Unit of Nutrition and Cancer, Translational Research Laboratory, Catalan Institute of Oncology (ICO) and Bellvitge Biomedical Research Institute (IDIBELL), 08908, Barcelona, Spain
| | - Gemma Llort
- Medical Oncology, Parc Taulí University Hospital, 08208, Sabadell, Spain
| | - Lara Aguilera
- Gastroenterology, Vall d'Hebron Research Institute, 08035, Barcelona, Spain
| | - Laura Carot
- Gastroenterology, Hospital del Mar, 08003, Barcelona, Spain
| | | | - Rodrigo Jover
- Gastroenterology, Departamento de Medicina Clínica, Hospital General Universitario Dr. Balmis, Instituto de Investigación Sanitaria ISABIAL, Universidad Miguel Hernández, 03010, Alicante, Spain
| | | | - Joaquín Cubiella
- Gastroenterology, Complexo Hospitalario de Ourense, CIBEREHD, 32005, Ourense, Spain
| | - Antoni Castells
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Francesc Balaguer
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Luis Bujanda
- Department of Hepatology and Gastroenterology, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Biodonostia Health Research Institute - Donostia University Hospital, Universidad del País Vasco (UPV/EHU), 20014, San Sebastián, Spain
| | - Sergi Castellví-Bel
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain
| | - Leticia Moreira
- Gastroenterology, Fundació de Recerca Clínic Barcelona-Institut d'Investigacions Biomèdiques August Pi I Sunyer (FRCB-IDIBAPS), CIBEREHD, Universitat de Barcelona, Hospital Clínic, Villarroel 170, 08036, Barcelona, Spain.
- Facultat de Medicina i Ciències de la Salut, Universitat de Barcelona (UB), Barcelona, Spain.
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Pally D, Pramanik D, Bhat R. An Interplay Between Reaction-Diffusion and Cell-Matrix Adhesion Regulates Multiscale Invasion in Early Breast Carcinomatosis. Front Physiol 2019; 10:790. [PMID: 31456688 PMCID: PMC6700745 DOI: 10.3389/fphys.2019.00790] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 06/04/2019] [Indexed: 12/12/2022] Open
Abstract
The progression of cancer in the breast involves multiple reciprocal interactions between malignantly transformed epithelia, surrounding untransformed but affected stromal cells, and the extracellular matrix (ECM) that is remodeled during the process. A quantitative understanding of the relative contribution of such interactions to phenotypes associated with cancer cells can be arrived at through the construction of increasingly complex experimental and computational models. Herein, we introduce a multiscale three-dimensional (3D) organo- and pathotypic experimental assay that approximates, to an unprecedented extent, the histopathological complexity of a tumor disseminating into its surrounding stromal milieu via both bulk and solitary motility dynamics. End point and time-lapse microscopic observations of this assay allow us to study the earliest steps of cancer invasion as well as the dynamical interactions between the epithelial and stromal compartments. We then simulate our experimental observations using the modeling environment Compucell3D that is based on the Glazier-Graner-Hogeweg model. The computational model, which comprises adhesion between cancer cells and the matrices, cell proliferation and apoptosis, and matrix remodeling through reaction-diffusion-based morphogen dynamics, is first trained to phenocopy controls run with the experimental model, wherein one or the other matrices have been removed. The trained computational model successfully predicts phenotypes of the experimental counterparts that are subjected to pharmacological treatments (inhibition of N-linked glycosylation and matrix metalloproteinase activity) and scaffold modulation (alteration of collagen density). Further parametric exploration-based simulations suggest that specific permissive regimes of cell-cell and cell-matrix adhesions, operating in the context of a reaction-diffusion-regulated ECM dynamics, promote multiscale invasion of breast cancer cells and determine the extent to which the latter migrate through their surrounding stroma.
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Affiliation(s)
| | | | - Ramray Bhat
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore, India
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Terriac E, Schütz S, Lautenschläger F. Vimentin Intermediate Filament Rings Deform the Nucleus During the First Steps of Adhesion. Front Cell Dev Biol 2019; 7:106. [PMID: 31263698 PMCID: PMC6590062 DOI: 10.3389/fcell.2019.00106] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 05/28/2019] [Indexed: 12/25/2022] Open
Abstract
During cell spreading, cells undergo many changes to their architecture and their mechanical properties. Vimentin, as an integral part of the cell architecture, and its mechanical stability must adapt to the new state of the cell. This study focuses on the structures formed by vimentin during the first steps of cell adhesion. Very early, ball-like structures, or "knots," are seen and often vimentin filaments emerge in the shape of rings around the nucleus. Although intermediate filaments are not known to be associated to motor proteins to form contractile systems, these rings can nonetheless strongly deform the cell nucleus. In the first 6 to 12 h of adhesion, these vimentin knots and rings disappear, and the intermediate filament network returns to the state seen before detachment of the cells. As these vimentin structures are very transient in the early steps of cell spreading, they have rarely been described in the literature. However, they can also be seen during mitosis, which is an event that involves partial detachment and re-spreading of the cells. Interestingly, the turnover dynamics of vimentin are reduced in both the knots and rings, compared to vimentin in the lamellipodia. It remains to define how the force is transmitted from the ball-like structures to the rings, and to measure the impact of such strong nuclear deformation on gene expression during cell re-spreading and the rearrangement of the vimentin network.
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Affiliation(s)
| | - Susanne Schütz
- Faculty of Natural Sciences and Technology, Saarland University, Saarbrücken, Germany
| | - Franziska Lautenschläger
- Leibniz Institute for New Materials, Saarbrücken, Germany
- Faculty of Natural Sciences and Technology, Saarland University, Saarbrücken, Germany
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Essential Role of mTOR Signaling in Human Retinal Pigment Epithelial Cell Regeneration After Laser Photocoagulation. Lasers Med Sci 2018; 34:1019-1029. [PMID: 30499005 DOI: 10.1007/s10103-018-2692-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 11/19/2018] [Indexed: 12/13/2022]
Abstract
This study assessed the role of mechanistic target of rapamycin (mTOR) pathway in the human adult retinal pigment epithelial (ARPE) cell response after laser photocoagulation (LP). The effect of mTOR inhibition on ARPE-19 cell was investigated by rapamycin treatment after LP. Cell viability and proliferation were explored using MTT and EdU assays, respectively. The expression of mTOR-related proteins and epithelial-mesenchymal transition (EMT) markers was verified by Western blot. Rapamycin retarded the LP area recovery in a dose-dependent manner by the 120 h, while LP+DMSO vehicle-treated cells completely restored the lesion zone (P ≤ 0.01). ARPE-19 cell viability is significantly lower in LP + rapamycin 80 and 160 ng/ml treated cultures compared to LP control at 120 h (P ≤ 0.001). LP control group demonstrated significantly more proliferative cells compared to untreated cells at the 72 and 120 h, whereas EdU-positive cell numbers in cultures treated with rapamycin at concentrations of 80 and 160 ng/ml were similar to baseline values (P ≤ 0.01). mTOR pathway activation is essential for regulation of the RPE cell migration and proliferation after LP. mTOR inhibition with rapamycin effectively blocks the migration and proliferation of the RPE cells. Our results demonstrate that mTOR has an important role in ARPE-19 cell as a regulator of cell behavior under stress conditions, suggesting that mTOR could be a promising therapeutic target for numerous retinal diseases.
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5
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Yang X, Chung JY, Rai U, Esumi N. Cadherins in the retinal pigment epithelium (RPE) revisited: P-cadherin is the highly dominant cadherin expressed in human and mouse RPE in vivo. PLoS One 2018; 13:e0191279. [PMID: 29338041 PMCID: PMC5770047 DOI: 10.1371/journal.pone.0191279] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Accepted: 01/02/2018] [Indexed: 01/26/2023] Open
Abstract
The retinal pigment epithelium (RPE) supports the health and function of retinal photoreceptors and is essential for normal vision. RPE cells are post-mitotic, terminally differentiated, and polarized epithelial cells. In pathological conditions, however, they lose their epithelial integrity, become dysfunctional, even dedifferentiate, and ultimately die. The integrity of epithelial cells is maintained, in part, by adherens junctions, which are composed of cadherin homodimers and p120-, β-, and α-catenins linking to actin filaments. While E-cadherin is the major cadherin for forming the epithelial phenotype in most epithelial cell types, it has been reported that cadherin expression in RPE cells is different from other epithelial cells based on results with cultured RPE cells. In this study, we revisited the expression of cadherins in the RPE to clarify their relative contribution by measuring the absolute quantity of cDNAs produced from mRNAs of three classical cadherins (E-, N-, and P-cadherins) in the RPE in vivo. We found that P-cadherin (CDH3) is highly dominant in both mouse and human RPE in situ. The degree of dominance of P-cadherin is surprisingly large, with mouse Cdh3 and human CDH3 accounting for 82-85% and 92-93% of the total of the three cadherin mRNAs, respectively. We confirmed the expression of P-cadherin protein at the cell-cell border of mouse RPE in situ by immunofluorescence. Furthermore, we found that oxidative stress induces dissociation of P-cadherin and β-catenin from the cell membrane and subsequent translocation of β-catenin into the nucleus, resulting in activation of the canonical Wnt/β-catenin pathway. This is the first report of absolute comparison of the expression of three cadherins in the RPE, and the results suggest that the physiological role of P-cadherin in the RPE needs to be reevaluated.
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Affiliation(s)
- Xue Yang
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Jin-Yong Chung
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Usha Rai
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Noriko Esumi
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
- * E-mail:
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6
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Hoja-Łukowicz D, Przybyło M, Duda M, Pocheć E, Bubka M. On the trail of the glycan codes stored in cancer-related cell adhesion proteins. Biochim Biophys Acta Gen Subj 2016; 1861:3237-3257. [PMID: 27565356 DOI: 10.1016/j.bbagen.2016.08.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 07/22/2016] [Accepted: 08/14/2016] [Indexed: 12/14/2022]
Abstract
Changes in the profile of protein glycosylation are a hallmark of ongoing neoplastic transformation. A unique set of tumor-associated carbohydrate antigens expressed on the surface of malignant cells may serve as powerful diagnostic and therapeutic targets. Cell-surface proteins with altered glycosylation affect the growth, proliferation and survival of those cells, and contribute to their acquisition of the ability to migrate and invade. They may also facilitate tumor-induced immunosuppression and the formation of distant metastases. Deciphering the information encoded in these particular glycan portions of glycoconjugates may shed light on the mechanisms of cancer progression and metastasis. A majority of the related review papers have focused on overall changes in the patterns of cell-surface glycans in various cancers, without pinpointing the molecular carriers of these glycan structures. The present review highlights the ways in which particular tumor-associated glycan(s) coupled with a given membrane-bound protein influence neoplastic cell behavior during the development and progression of cancer. We focus on altered glycosylated cell-adhesion molecules belonging to the cadherin, integrin and immunoglobulin-like superfamilies, examined in the context of molecular interactions.
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Affiliation(s)
- Dorota Hoja-Łukowicz
- Department of Glycoconjugate Biochemistry, Institute of Zoology, Jagiellonian University, 9 Gronostajowa Street, 30-387 Krakow, Poland.
| | - Małgorzata Przybyło
- Department of Glycoconjugate Biochemistry, Institute of Zoology, Jagiellonian University, 9 Gronostajowa Street, 30-387 Krakow, Poland.
| | - Małgorzata Duda
- Department of Endocrinology, Institute of Zoology, Jagiellonian University, 9 Gronostajowa Street, 30-387 Krakow, Poland.
| | - Ewa Pocheć
- Department of Glycoconjugate Biochemistry, Institute of Zoology, Jagiellonian University, 9 Gronostajowa Street, 30-387 Krakow, Poland.
| | - Monika Bubka
- Department of Glycoconjugate Biochemistry, Institute of Zoology, Jagiellonian University, 9 Gronostajowa Street, 30-387 Krakow, Poland.
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Wu Y, Xu JX, El-Jouni W, Lu T, Li S, Wang Q, Tran M, Yu W, Wu M, Barrera IE, Bonventre JV, Zhou J, Denker BM, Kong T. Gα12 is required for renal cystogenesis induced by Pkd1 inactivation. J Cell Sci 2016; 129:3675-3684. [PMID: 27505895 DOI: 10.1242/jcs.190496] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 07/21/2016] [Indexed: 01/09/2023] Open
Abstract
Mutation of PKD1, encoding the protein polycystin-1 (PC1), is the main cause of autosomal dominant polycystic kidney disease (ADPKD). The signaling pathways downstream of PC1 in ADPKD are still not fully understood. Here, we provide genetic evidence for the necessity of Gα12 (encoded by Gna12, hereafter Gα12) for renal cystogenesis induced by Pkd1 knockout. There was no phenotype in mice with deletion of Gα12 (Gα12-/-). Polyinosine-polycytosine (pI:pC)-induced deletion of Pkd1 (Mx1Cre+Pkd1f/fGα12+/+) in 1-week-old mice resulted in multiple kidney cysts by 9 weeks, but the mice with double knockout of Pkd1 and Gα12 (Mx1Cre+Pkd1f/fGα12-/-) had no structural and functional abnormalities in the kidneys. These mice could survive more than one year without kidney abnormalities except multiple hepatic cysts in some mice, which indicates that the effect of Gα12 on cystogenesis is kidney specific. Furthermore, Pkd1 knockout promoted Gα12 activation, which subsequently decreased cell-matrix and cell-cell adhesion by affecting the function of focal adhesion and E-cadherin, respectively. Our results demonstrate that Gα12 is required for the development of kidney cysts induced by Pkd1 mutation in mouse ADPKD.
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Affiliation(s)
- Yong Wu
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Jen X Xu
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Wassim El-Jouni
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Tzongshi Lu
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Suyan Li
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Qingyi Wang
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Mei Tran
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA Renal Division, Beth Israel Deaconess Medical Center and Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA
| | - Wanfeng Yu
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Maoqing Wu
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Ivan E Barrera
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Joseph V Bonventre
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Jing Zhou
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Bradley M Denker
- Renal Division, Beth Israel Deaconess Medical Center and Harvard Medical School, 330 Brookline Avenue, Boston, MA 02215, USA
| | - Tianqing Kong
- Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
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Vagin O, Dada LA, Tokhtaeva E, Sachs G. The Na-K-ATPase α₁β₁ heterodimer as a cell adhesion molecule in epithelia. Am J Physiol Cell Physiol 2012; 302:C1271-81. [PMID: 22277755 PMCID: PMC3361946 DOI: 10.1152/ajpcell.00456.2011] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2011] [Accepted: 01/24/2012] [Indexed: 11/22/2022]
Abstract
The ion gradients generated by the Na-K-ATPase play a critical role in epithelia by driving transepithelial transport of various solutes. The efficiency of this Na-K-ATPase-driven vectorial transport depends on the integrity of epithelial junctions that maintain polar distribution of membrane transporters, including the basolateral sodium pump, and restrict paracellular diffusion of solutes. The review summarizes the data showing that, in addition to pumping ions, the Na-K-ATPase located at the sites of cell-cell junction acts as a cell adhesion molecule by interacting with the Na-K-ATPase of the adjacent cell in the intercellular space accompanied by anchoring to the cytoskeleton in the cytoplasm. The review also discusses the experimental evidence on the importance of a specific amino acid region in the extracellular domain of the Na-K-ATPase β(1) subunit for the Na-K-ATPase trans-dimerization and intercellular adhesion. Furthermore, a possible role of N-glycans linked to the Na-K-ATPase β(1) subunit in regulation of epithelial junctions by modulating β(1)-β(1) interactions is discussed.
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Affiliation(s)
- Olga Vagin
- Department of Physiology, School of Medicine, University of California Los Angeles and Veterans Administration Greater Los Angeles Health Care System, Los Angeles, California, USA.
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Huang C, Zhang J, Ao M, Li Y, Zhang C, Xu Y, Li X, Wang W. Combination of retinal pigment epithelium cell-conditioned medium and photoreceptor outer segments stimulate mesenchymal stem cell differentiation toward a functional retinal pigment epithelium cell phenotype. J Cell Biochem 2012; 113:590-8. [PMID: 21948619 DOI: 10.1002/jcb.23383] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Recent studies have suggested that bone marrow-derived mesenchymal stem cells (BMMSCs) are capable of retinal tissue-specific differentiation but not retinal pigment epithelium (RPE) cell-specific differentiation. Photoreceptor outer segments (POS) contribute to RPE development and maturation. However, there has been no standard culture system that fosters the differentiation of BMMSCs into mature RPE cells in vitro. In this study, we investigated if the soluble factors from RPE cells and POS could differentiate BMMSCs into cells having a phenotype characteristic of RPE cells. Rat BMMSCs were separately co-cultured with RPE cells, or they were exposed to either control medium, RPE cell-conditioned medium (RPECM), POS, or a combination of RPECM and POS (RPECM-POS). After 7 days, the cells were analyzed for morphology and the expression of RPE markers (cytokeratin 8, CRALBP, and RPE65) to assess the RPE differentiation. Significantly higher pigment accumulation and increased protein expression of the three markers were seen in cells cultured in RPECM-POS than in other treated cultures. Furthermore, the RPECM-POS-treated cultures displayed ultrastructural features typical of RPE cells, expressed RPE cell functional proteins, and had the capability to phagocytose POS. Together, theses results suggest the combination of RPECM and POS stimulate BMMSCs differentiation toward a functional RPE phenotype. Our results provide the foundation for a new route to RPE regenerative therapy involving BMMSCs. Future work isolating the active agent in RPECM and POS would be useful in therapies for RPE diseases or in developing appropriately pre-differentiated BMMSCs for tissue-engineered RPE reconstruction.
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Affiliation(s)
- Chen Huang
- Department of Ophthalmology, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing 100191, China
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Chen JS, Su IJ, Leu YW, Young KC, Sun HS. Expression of T-cell lymphoma invasion and metastasis 2 (TIAM2) promotes proliferation and invasion of liver cancer. Int J Cancer 2011; 130:1302-13. [PMID: 21469146 DOI: 10.1002/ijc.26117] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Accepted: 03/22/2011] [Indexed: 01/04/2023]
Abstract
The T-cell lymphoma invasion and metastasis 2 (TIAM2) gene is the homolog of human TIAM1, a Rac-specific guanine nucleotide exchange factor that plays important roles in neuron development and human malignancies. Although the role of TIAM1 is well characterized, the physiological and pathological functions of TIAM2 remain unknown. In our study, human cDNA and protein panels were evaluated for endogenous expression of TIAM2. Four hepatocellular carcinoma (HCC) cell lines and 91 HCC samples were used to demonstrate expression of TIAM2S (the short form of TIAM2) in cancer cells. In addition, HepG2 cells stably expressing TIAM2S were used for tumorigenic assays in both cellular and mouse models. We demonstrate that endogenous TIAM2S was induced in several human cancers including HCC. TIAM2S expression was undetectable in normal human liver but was induced in all HCC cell lines and in 86% (78/91) of HCC biopsies. TIAM2S expression was positively associated with TIAM1 expression, hepatitis B virus (HBV) infection and metastatic phenotype. Expression of recombinant TIAM2S in HepG2 cells promoted growth and invasiveness. In vivo study using a xenografted mouse model demonstrated that induced endogenous expression of TIAM2S converted non-invasive human HCC cells into highly aggressive vascular tumors. Further examination revealed that TIAM2S expression resulted in up-regulation of N-cadherin and vimentin, and in redistribution of E-cadherin. These findings show, for the first time, that human TIAM2S is involved in HCC pathogenesis, and that increased expression of TIAM2S promotes epithelial-to-mesenchymal transition and results in proliferation and invasion in liver cancer cells.
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Affiliation(s)
- Jia-Shing Chen
- The Institute of Basic Medical Sciences, National Cheng Kung University Medical College, Tainan, Taiwan
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11
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Nita-Lazar M, Rebustini I, Walker J, Kukuruzinska MA. Hypoglycosylated E-cadherin promotes the assembly of tight junctions through the recruitment of PP2A to adherens junctions. Exp Cell Res 2010; 316:1871-84. [PMID: 20156436 PMCID: PMC2878840 DOI: 10.1016/j.yexcr.2010.02.008] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Revised: 02/05/2010] [Accepted: 02/08/2010] [Indexed: 12/29/2022]
Abstract
Epithelial cell-cell adhesion is controlled by multiprotein complexes that include E-cadherin-mediated adherens junctions (AJs) and ZO-1-containing tight junctions (TJs). Previously, we reported that reduction of E-cadherin N-glycosylation in normal and cancer cells promoted stabilization of AJs through changes in the composition and cytoskeletal association of E-cadherin scaffolds. Here, we show that enhanced interaction of hypoglycosylated E-cadherin-containing AJs with protein phosphatase 2A (PP2A) represents a mechanism for promoting TJ assembly. In MDCK cells, attenuation of cellular N-glycosylation with siRNA to DPAGT1, the first gene in the N-glycosylation pathway, reduced N-glycosylation of surface E-cadherin and resulted in increased recruitment of stabilizing proteins gamma-catenin, alpha-catenin, vinculin and PP2A to AJs. Greater association of PP2A with AJs correlated with diminished binding of PP2A to ZO-1 and claudin-1 and with increased pools of serine-phosphorylated ZO-1 and claudin-1. More ZO-1 was found in complexes with occludin and claudin-1, and this corresponded to enhanced transepithelial resistance (TER), indicating physiological assembly of TJs. Similar maturation of AJs and TJs was detected after transfection of MDCK cells with the hypoglycosylated E-cadherin variant, V13. Our data indicate that E-cadherin N-glycans coordinate the maturity of AJs with the assembly of TJs by affecting the association of PP2A with these junctional complexes.
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Affiliation(s)
- Mihai Nita-Lazar
- Department of Molecular and Cell Biology, Boston University Medical Center, Boston, MA 02118
| | - Ivan Rebustini
- Matrix and Morphogenesis Unit, Craniofacial Developmental Biology and Regeneration Branch, National Institute for Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland
| | - Janice Walker
- Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, Pennsylvania
| | - Maria A. Kukuruzinska
- Department of Molecular and Cell Biology, Boston University Medical Center, Boston, MA 02118
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12
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Ozaki C, Obata S, Yamanaka H, Tominaga S, Suzuki ST. The extracellular domains of E- and N-cadherin determine the scattered punctate localization in epithelial cells and the cytoplasmic domains modulate the localization. J Biochem 2009; 147:415-25. [PMID: 19919954 DOI: 10.1093/jb/mvp192] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The accumulation of classical cadherins is essential for their function, but the mechanism is poorly understood. Hence, we investigated the accumulation of E- and N-cadherin and the formation of cell junctions in epithelial cells. Immunostaining revealed a scattered dot-like accumulation of E- and N-cadherin throughout the lateral membrane in MDCK II and other epithelial cells. Mutant E-cadherin lacking the beta-catenin binding site accumulated granularly at cell-cell contact sites and showed weak cell aggregation activity in cadherin-deficient epithelial cells, MIA PaCa2 cells. Mutant E-cadherin lacking the p120-catenin binding site exhibited scattered punctate accumulation and strong cell adhesion activity in MIA PaCa2 cells. Electron microscopy demonstrated that MIA PaCa2 transfectants of E-cadherin containing beta-catenin binding site formed adherens junction, whereas E-cadherin lacking the binding site did not. Mutant N-cadherins showed accumulation properties similar to those of corresponding mutant E-cadherins. Moreover, wild type and mutant N-cadherin lacking the p120-catenin binding site showed subapical accumulation in polarized DLD-1 cells, whereas mutant N-cadherin lacking beta-catenin binding site did not. These results indicate that the extracellular domains of E- and N-cadherin determines the basic localization pattern, whereas the cytoplasmic domains modulate it thereby affects the cell adhesion activity, subapical accumulation, and the formation of adherens junction.
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Affiliation(s)
- Chisa Ozaki
- Department of Bioscience, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda-shi, Hyogo-ken, Japan
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13
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Guo HB, Johnson H, Randolph M, Pierce M. Regulation of homotypic cell-cell adhesion by branched N-glycosylation of N-cadherin extracellular EC2 and EC3 domains. J Biol Chem 2009; 284:34986-97. [PMID: 19846557 DOI: 10.1074/jbc.m109.060806] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The effects of altering N-cadherin N-glycosylation on several cadherin-mediated cellular behaviors were investigated using small interfering RNA and site-directed mutagenesis. In HT1080 fibrosarcoma cells, small interfering RNA-directed knockdown of N-acetylglucosaminyltransferase V (GnT-V), a glycosyltransferase up-regulated by oncogene signaling, caused decreased expression of N-linked beta(1,6)-branched glycans expressed on N-cadherin, resulting in enhanced N-cadherin-mediated cell-cell adhesion, but had no effect on N-cadherin expression on the cell surface. This effect on adhesion was accompanied by decreased cell migration and invasion, opposite of the effects observed when GnT-V was overexpressed in these cells (Guo, H. B., Lee, I., Kamar, M., and Pierce, M. (2003) J. Biol. Chem. 278, 52412-52424). A detailed study using site-directed mutagenesis demonstrated that three of the eight putative N-glycosylation sites in the N-cadherin sequence showed N-glycan expression. Moreover, all three of these sites, located in the extracellular domains EC2 and EC3, were shown by leucoagglutinating phytohemagglutinin binding to express at least some beta(1,6)-branched glycans, products of GnT-V activity. Deletion of these sites had no effect on cadherin levels on the cell surface but led to increased stabilization of cell-cell contacts, cell-cell adhesion- mediated intracellular signaling, and reduced cell migration. We show for the first time that these deletions had little effect on formation of the N-cadherin-catenin complex but instead resulted in increased N-cadherin cis-dimerization. Branched N-glycan expression at three sites in the EC2 and -3 domains regulates N-cadherin-mediated cell-cell contact formation, outside-in signaling, and cell migration and is probably a significant contributor to the increase in the migratory/invasive phenotype of cancer cells that results when GnT-V activity is up-regulated by oncogene signaling.
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Affiliation(s)
- Hua-Bei Guo
- Department of Biochemistry and Molecular Biology, Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30605, USA.
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14
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Burke JM. Epithelial phenotype and the RPE: is the answer blowing in the Wnt? Prog Retin Eye Res 2008; 27:579-95. [PMID: 18775790 DOI: 10.1016/j.preteyeres.2008.08.002] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Cells of the human retinal pigment epithelium (RPE) have a regular epithelial cell shape within the tissue in situ, but for reasons that remain elusive the RPE shows an incomplete and variable ability to re-develop an epithelial phenotype after propagation in vitro. In other epithelial cell cultures, formation of an adherens junction (AJ) composed of E-cadherin plays an important early inductive role in epithelial morphogenesis, but E-cadherin is largely absent from the RPE. In this review, the contribution of cadherins, both minor (E-cadherin) and major (N-cadherin), to RPE phenotype development is discussed. Emphasis is placed on the importance for future studies of actin cytoskeletal remodeling during assembly of the AJ, which in epithelial cells results in an actin organization that is characteristically zonular. Other markers of RPE phenotype that are used to gauge the maturation state of RPE cultures including tissue-specific protein expression, protein polarity, and pigmentation are described. An argument is made that RPE epithelial phenotype, cadherin-based cell-cell adhesion and melanization are linked by a common signaling pathway: the Wnt/beta-catenin pathway. Analyzing this pathway and its intersecting signaling networks is suggested as a useful framework for dissecting the steps in RPE morphogenesis. Also discussed is the effect of aging on RPE phenotype. Preliminary evidence is provided to suggest that light-induced sub-lethal oxidative stress to cultured ARPE-19 cells impairs organelle motility. Organelle translocation, which is mediated by stress-susceptible cytoskeletal scaffolds, is an essential process in cell phenotype development and retention. The observation of impaired organelle motility therefore raises the possibility that low levels of stress, which are believed to accompany RPE aging, may produce subtle disruptions of cell phenotype. Over time these would be expected to diminish the support functions performed by the RPE on behalf of photoreceptors, theoretically contributing to aging retinal disease such as age-related macular degeneration (AMD). Analyzing sub-lethal stress that produces declines in RPE functional efficiency rather than overt cell death is suggested as a useful future direction for understanding the effects of age on RPE organization and physiology. As for phenotype and pigmentation, a role for the Wnt/beta-catenin pathway is also suggested in regulating the RPE response to oxidative stress. Exploration of this pathway in the RPE therefore may provide a unifying strategy for advancing our understanding of both RPE phenotype and the consequences of mild oxidative stress on RPE structure and function.
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Affiliation(s)
- Janice M Burke
- Department of Ophthalmology, Medical College of Wisconsin, The Eye Institute, 925 North 87th Street, Milwaukee, WI 53226-4812, USA.
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Vagin O, Tokhtaeva E, Yakubov I, Shevchenko E, Sachs G. Inverse correlation between the extent of N-glycan branching and intercellular adhesion in epithelia. Contribution of the Na,K-ATPase beta1 subunit. J Biol Chem 2007; 283:2192-202. [PMID: 18025087 DOI: 10.1074/jbc.m704713200] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The majority of cell adhesion molecules are N-glycosylated, but the role of N-glycans in intercellular adhesion in epithelia remains ill-defined. Reducing N-glycan branching of cellular glycoproteins by swainsonine, the inhibitor of N-glycan processing, tightens and stabilizes cell-cell junctions as detected by a 3-fold decrease in the paracellular permeability and a 2-3-fold increase in the resistance of the adherens junction proteins to extraction by non-ionic detergent. In addition, exposure of cells to swainsonine inhibits motility of MDCK cells. Mutagenic removal of N-glycosylation sites from the Na,K-ATPase beta(1) subunit impairs cell-cell adhesion and decreases the effect of swainsonine on the paracellular permeability of the cell monolayer and also on detergent resistance of adherens junction proteins, indicating that the extent of N-glycan branching of this subunit is important for intercellular adhesion. The N-glycans of the Na,K-ATPase beta(1) subunit and E-cadherin are less complex in tight renal epithelia than in the leakier intestinal epithelium. The complexity of the N-glycans linked to these proteins gradually decreases upon the formation of a tight monolayer from dispersed MDCK cells. This correlates with a cell-cell adhesion-induced increase in expression of GnT-III (stops N-glycan branching) and a decrease in expression of GnTs IVC and V (promote N-glycan branching) as detected by real-time quantitative PCR. Consistent with these results, partial silencing of the gene encoding GnT-III increases branching of N-glycans linked to the Na,K-ATPase beta(1) subunit and other glycoproteins and results in a 2-fold increase in the paracellular permeability of MDCK cell monolayers. These results suggest epithelial cells can regulate tightness of cell junctions via remodeling of N-glycans, including those linked to the Na,K-ATPase beta(1)-subunit.
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Affiliation(s)
- Olga Vagin
- Department of Physiology, School of Medicine, University of California, Los Angeles, Veterans Administration Greater Los Angeles Health Care System, Los Angeles, California 90073, USA.
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Burke JM, Hong J. Fate of E-cadherin in early RPE cultures: transient accumulation of truncated peptides at nonjunctional sites. Invest Ophthalmol Vis Sci 2006; 47:3635-43. [PMID: 16877438 PMCID: PMC1559998 DOI: 10.1167/iovs.06-0104] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
PURPOSE E-cadherin is known to accumulate variably and slowly at junctions of cultured human RPE cells. The intent of this investigation was to determine what limits E-cadherin protein accumulation in RPE cells by analyzing cultures at early postplating intervals when junctions of the dominant cadherin (N-cadherin) are first forming. METHODS RPE cell lines hTERT-RPE1 and ARPE-19 and RPE cultures established from human donors were analyzed within 48 hours after plating for E-cadherin gene and protein expression (by RT-PCR and Western blotting, respectively) and for protein distribution (by immunofluorescence and immuno-electron microscopy), including codistribution with markers for organelles. Cell surface localization was analyzed by biotinylation and trypsin cleavage of extracellular cadherin domains. RESULTS The E-cadherin gene was constitutively expressed by RPE cultures, but the protein did not accumulate substantially in early RPE cultures. Instead small amounts of newly synthesized E-cadherin were detectable only transiently, peaking within a few hours after plating, at which time the protein was in the form of peptides of variable size rather the predicted 120-kDa molecular mass. Immunoreactive E-cadherin peptides did not traffic to the cell surface and localize to junctions. Rather they codistributed with several organelles including the endoplasmic reticulum (ER; but not the Golgi), sites of protein degradation (proteasomes, lysosomes, and autophagosomes) and unusual compartments (centrosomes and apposed to subdomains of the mitochondrial network). CONCLUSIONS The results suggest that in RPE cells posttranscriptional mechanisms involving altered protein processing and rapid turnover exist to limit E-cadherin accumulation. The consequence may be to limit E-cadherin-specific inductive properties in the RPE, a cell type in which N-cadherin is the normal dominant cadherin.
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Affiliation(s)
- Janice M Burke
- Department of Ophthalmology, Medical College of Wisconsin, Madison, 53226, USA.
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