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Surveying FDA-approved drugs as new potential inhibitors of N-cadherin protein: a virtual screening approach. Struct Chem 2020. [DOI: 10.1007/s11224-020-01595-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Mariotti A, Perotti A, Sessa C, Rüegg C. N-cadherin as a therapeutic target in cancer. Expert Opin Investig Drugs 2007; 16:451-65. [PMID: 17371194 DOI: 10.1517/13543784.16.4.451] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
During tumor progression, cancer cells undergo dramatic changes in the expression profile of adhesion molecules resulting in detachment from original tissue and acquisition of a highly motile and invasive phenotype. A hallmark of this change, also referred to as the epithelial-mesenchymal transition, is the loss of E- (epithelial) cadherin and the de novo expression of N- (neural) cadherin adhesion molecules. N-cadherin promotes tumor cell survival, migration and invasion, and a high level of its expression is often associated with poor prognosis. N-cadherin is also expressed in endothelial cells and plays an essential role in the maturation and stabilization of normal vessels and tumor-associated angiogenic vessels. Increasing experimental evidence suggests that N-cadherin is a potential therapeutic target in cancer. A peptidic N-cadherin antagonist (ADH-1) has been developed and has entered clinical testing. In this review, the authors discuss the biochemical and functional features of N-cadherin, its potential role in cancer and angiogenesis, and summarize the preclinical and clinical results achieved with ADH-1.
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Affiliation(s)
- Agnese Mariotti
- Centre Pluridisciplinaire d'Oncologie, Division of Experimental Oncology, Lausanne Cancer Center, and Swiss Institute for Experimental Cancer Research (ISREC), NCCR Molecular Oncology, Epalinges, Switzerland.
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Abstract
Cadherins are transmembrane glycoproteins that mediate calcium-dependent cell-cell adhesion. The cadherin family is large and diverse, and proteins are considered to be members of this family if they have one or more cadherin repeats in their extracellular domain. Cadherin family members are the transmembrane components of a number of cellular junctions, including adherens junctions, desmosomes, cardiac junctions, endothelial junctions, and synaptic junctions. Cadherin function is critical in normal development, and alterations in cadherin function have been implicated in tumorigenesis. The strength of cadherin interactions can be regulated by a number of proteins, including the catenins, which serve to link the cadherin to the cytoskeleton. Cadherins have been implicated in a number of signaling pathways that regulate cellular behavior, and it is becoming increasingly clear that integration of information received from cell-cell signaling, cell-matrix signaling, and growth factor signaling determines ultimate cellular phenotype and behavior.
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Affiliation(s)
- Margaret J Wheelock
- Department of Oral Biology, College of Dentistry and Eppley Cancer Center, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696, USA.
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Grunwald GB. Chapter 3 Cadherin Cell adhesion molecules in development and disease. Dev Biol 1998. [DOI: 10.1016/s1569-2582(98)80018-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Paradies NE, Grunwald GB. Purification and characterization of NCAD90, a soluble endogenous form of N-cadherin, which is generated by proteolysis during retinal development and retains adhesive and neurite-promoting function. J Neurosci Res 1993; 36:33-45. [PMID: 8230319 DOI: 10.1002/jnr.490360105] [Citation(s) in RCA: 87] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The cadherins are calcium-dependent cell adhesion molecules which regulate cell-cell interactions during morphogenesis. During development, cadherin expression is subject to dynamic patterns of regulation. We have previously demonstrated that expression of N-cadherin, the predominant cadherin of neural tissues, is sharply down-regulated during development of the retina and brain during later stages of histogenesis (Lagunowich and Grunwald, Dev Biol 135:158-171, 1989; Lagunowich et al., J Neurosci Res 32:202-208, 1992), and that this down-regulation is due to multiple factors, including decreased mRNA levels and turnover apparently mediated by endogenous metalloproteolytic activity (Roark et al., Development 114:973-984, 1992). In the present study, we describe metabolic studies which provide direct biochemical evidence for turnover of 130-kDa N-cadherin in embryonic retina tissues, yielding a soluble 90-kDa N-terminal fragment. We demonstrate that this form of N-cadherin, which we refer to as NCAD90, accumulates in vivo during development. We further demonstrate that purified NCAD90, obtained from embryonic vitreous humor, retains biological function and promotes cell adhesion and neurite growth in a dose-dependent fashion among chick embryo neural retina cells when present in a substrate-bound form. The morphology of retinal cells and neurites grown on a substrate of NCAD90 differs strikingly from that seen on a laminin substrate, in a manner similar to that described for intact 130-kDa N-cadherin. We conclude that proteolysis of N-cadherin at the cell surface during embryonic retinal histogenesis is an endogenous mechanism for regulating N-cadherin expression which generates a novel and functional form of the protein. The results further indicate that an intact cytoplasmic domain is not essential for all cadherin functions.
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Affiliation(s)
- N E Paradies
- Department of Anatomy and Developmental Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
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Lagunowich LA, Schneider JC, Chasen S, Grunwald GB. Immunohistochemical and biochemical analysis of N-cadherin expression during CNS development. J Neurosci Res 1992; 32:202-8. [PMID: 1404493 DOI: 10.1002/jnr.490320209] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The expression of the calcium-dependent adhesion molecule N-cadherin during chick embryo central nervous system (CNS) development was examined by immunohistochemistry and electrophoresis and immunoblotting. During histogenesis, N-cadherin is expressed at high levels in a uniform fashion in many regions of the CNS. However, during later stages of development, expression becomes restricted to the ependymal cells lining the ventricular system and in the choroid plexus. This down-regulation was confirmed by both immunohistochemical and biochemical techniques. The program of expression lags behind in the cerebellum in concert with the delayed development of this region of the brain. A high level of N-cadherin was found to be expressed in the brainstem and spinal cord floorplate, while a low level was detected at the optic nerve head. The results indicate that while, in general, the program of N-cadherin expression is similar in the retina and the brain, certain structures unique to the eye and brain express locally high or low levels of this adhesion protein.
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Affiliation(s)
- L A Lagunowich
- Department of Anatomy, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
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Lagunowich LA, Grunwald GB. Tissue and age-specificity of post-translational modifications of N-cadherin during chick embryo development. Differentiation 1991; 47:19-27. [PMID: 1916067 DOI: 10.1111/j.1432-0436.1991.tb00217.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Our previous studies indicated that regulation of N-cadherin expression differs spatially and temporally among tissues of the eye, possibly reflecting the distinct roles it has in the development and maintenance of eye tissues. To understand this regulation of N-cadherin expression and its function in different tissues during embryonic development, we investigated the post-translational modifications of N-cadherin and its association with the cytoskeleton. We show that N-cadherin is a sulfated and phosphorylated protein. The phosphorylation of N-cadherin occurs in an age- and tissue-specific pattern during development in the neural retina, brain, lens and heart. The extent of sulfation of N-cadherin is also age-dependent, and both sulfated and unsulfated pools of N-cadherin exist in the same tissue as indicated by two-dimensional electrophoresis. The degree of association of N-cadherin with the cytoskeleton differs from one tissue to another, as well as within a single tissue at different stages of development. A positive correlation was found between the extent, developmental timing, and tissue specificity of N-cadherin phosphorylation and the degree of N-cadherin association with the cytoskeleton. Our results suggest the existence of a microheterogeneous population of N-cadherin molecules, within which posttranslational modification of N-cadherin may affect its association with the cytoskeleton and its expression and function during development.
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Affiliation(s)
- L A Lagunowich
- Department of Anatomy, Thomas Jefferson University, Philadelphia, PA 19107
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Affiliation(s)
- B Boyer
- Laboratoire de Physiopathologie du Developpement, ENS and CNRS, Paris, France
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Lagunowich LA, Grunwald GB. Expression of calcium-dependent cell adhesion during ocular development: a biochemical, histochemical and functional analysis. Dev Biol 1989; 135:158-71. [PMID: 2475376 DOI: 10.1016/0012-1606(89)90166-8] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Previous studies of the adhesive properties of embryonic chick neural retina cells indicate a gradual decrease in the expression of calcium-dependent adhesions during retinal histogenesis, a function which has been attributed in part to gp130/4.8, a retinal calcium-dependent adhesion-associated cell surface membrane glycoprotein with a molecular weight of approximately 130 kDa and an isoelectric point of 4.8 (G. B. Grunwald, R. Pratt, and J. Lilien, 1982, J. Cell Sci. 55, 69-83). The experiments described here were done to define the relationship of gp130/4.8 to N-cadherin, another calcium-dependent adhesion molecule found in chick retina, which has a reported molecular weight of 127 kDa and which is recognized by monoclonal antibody NCD-2 (K. Hatta and M. Takeichi, 1986, Nature (London) 320, 447-449). Using two-dimensional gel electrophoresis followed by Western blotting as well as quantitative solid-phase immunoassays, polyspecific antisera recognizing gp130/4.8 were compared with monoclonal antibody NCD-2 for reactivity with proteins of retina and other tissues. The data lead us to conclude that retinal calcium-dependent adhesion proteins gp130/4.8 and N-cadherin are likely to be the same molecule. In order to obtain evidence for a direct correlation of changes in expression of these adhesion proteins with changes in retinal cell adhesivity and related morphogenetic events, parallel studies were carried out with cells from various ocular tissues to examine the functional, biochemical, and immunohistochemical expression of N-cadherin during ocular development. Immunohistochemical mapping of N-cadherin in the developing chick eye reveals three modes of N-cadherin expression which occur simultaneously in different ocular tissues: (1) down-regulation, (2) up-regulation, and (3) steady-state expression. These patterns of expression correlate with changes in the adhesive behavior of cells as well as with discrete stages in the morphogenesis of several ocular tissues. The results suggest that N-cadherin is a versatile cell adhesion protein with a role in both the development of several ocular tissues and the maintenance of specialized structures in the mature eye.
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Affiliation(s)
- L A Lagunowich
- Department of Anatomy and Developmental Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
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Pizzey JA, Jones GE, Walsh FS. Requirements for the Ca2+-independent component in the initial intercellular adhesion of C2 myoblasts. J Cell Biol 1988; 107:2307-17. [PMID: 3198689 PMCID: PMC2115660 DOI: 10.1083/jcb.107.6.2307] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Using a sensitive and quantitative adhesion assay, we have studied the initial stages of the intercellular adhesion of the C2 mouse myoblast line. After dissociation in low levels of trypsin in EDTA, C2 cells can rapidly reaggregate by Ca2+-independent mechanisms to form large multicellular aggregates. If cells are allowed to recover from dissociation by incubation in defined media, this adhesive system is augmented by a Ca2+-dependent mechanism with maximum recovery seen after 4 h incubation. The Ca2+-independent adhesion system is inhibited by preincubation of cell monolayers with cycloheximide before dissociation. Aggregation is also reduced after exposure to monensin, implicating a role for surface-translocated glycoproteins in this mechanism of adhesion. In coaggregation experiments using C2 myoblasts and 3T3 fibroblasts in which the Ca2+-dependent adhesion system was inactivated, no adhesive specificity between the two cell types was seen. Although synthetic peptides containing the RGD sequence are known to inhibit cell-substratum adhesion in various cell types, incubation of C2 myoblasts with the integrin-binding tetrapeptide, RGDS, greatly stimulated the Ca2+-independent aggregation of these cells while control analogs had no effect. These results show that a Ca2+-independent mechanism alone is sufficient to allow for the rapid formation of multicellular aggregates in a mouse myoblast line, and that many of the requirements and perturbants of the Ca2+-independent system of intercellular myoblast adhesion are similar to those of the Ca2+-dependent adhesion mechanisms.
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Affiliation(s)
- J A Pizzey
- Department of Neurochemistry, Institute of Neurology, London, United Kingdom
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Fischer G, Schachner M. Characterization of Ca2+-dependent and -independent aggregation mechanisms among mouse cerebellar cells. Brain Res 1988; 471:39-47. [PMID: 2464413 DOI: 10.1016/0165-3806(88)90151-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
To gain insight into the cellular and molecular mechanisms underlying cell interactions in the early postnatal mouse cerebellum, Ca2+-dependent and -independent aggregation mechanisms were characterized using single cell suspensions under conditions that allow discrimination between the two mechanisms. When cerebellar cells were derived from newborn to 10-day-old mouse cerebellum, both mechanisms were active and showed no major change in activity during this time period. Mg2+ could not replace Ca2+ in the Ca2+-dependent mechanism. In contrast to the Ca2+-independent mechanisms, the Ca2+-dependent mechanism was inactive at low temperatures, suggesting a necessity for molecular rearrangement within the surface membrane during aggregation. Neuraminidase, chondroitinase, heparinase or hyaluronidase treatment of cells did not influence the aggregation of cells under Ca2+-dependent and -independent conditions. Chondroitin sulfate inhibited and hyaluronic acid stimulated the Ca2+-dependent mechanism, whereas chondroitin sulfate only slightly and hyaluronic acid strongly inhibited the Ca2+-independent one. Dextran sulfate slightly inhibited both mechanisms, whereas heparin and fucoidan, a complex sulfated carbohydrate, did not influence cell aggregation, while they strongly inhibited attachment of cells to laminin. The polycation poly-L-lysine slightly stimulated the Ca2+-independent mechanism, but inhibited the Ca2+-dependent one. Interestingly, chondroitin sulfate and hyaluronic acid strongly stimulated cell aggregation under conditions where both mechanisms were almost destroyed or inactive. Dextran sulfate showed only a small effect under these conditions. These observations indicate that different molecular mechanisms are active in cell-cell versus cell-extracellular matrix interactions and suggest a hitherto unknown complexity in molecular mechanisms during early postnatal cerebellar development.
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Affiliation(s)
- G Fischer
- Department of Neurobiology, University of Heidelberg, F.R.G
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Thomas WA. Dual adhesive recognition systems in chick embryonic cells. DEVELOPMENTAL BIOLOGY (NEW YORK, N.Y. : 1985) 1986; 3:157-89. [PMID: 3077963 DOI: 10.1007/978-1-4684-5050-7_9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- W A Thomas
- Department of Biology, Wake Forest University, Winston-Salem, North Carolina 27109
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Abstract
Cultured chick myoblasts (Mb) were resuspended by incubation with 100 micrograms/ml trypsin/2.5 mM CaCl2 (to yield TC-Mb), or with 5 micrograms/ml trypsin/2.5 mM EDTA (to yield LTE-Mb). As measured in a particle counter, TC-Mb aggregation was Ca2+ dependent, whereas LTE-Mb aggregated equally well in the presence of CaCl2 or EDTA. Cells subjected to the same treatments in sequence, like cells dissociated directly with 100 micrograms/ml trypsin/2.5 mM EDTA, did not aggregate significantly in the presence or absence of Ca2+. Adhesive specificity was assessed by mixing unlabeled cells with cells labeled with a fluorescent dye and then analyzing the distribution of fluorescent and nonfluorescent cells in aggregates. No adhesive specificity was seen in controls (i.e., TC-Mb aggregated randomly with TC-Mb, or LTE-Mb with LTE-Mb), but TC-Mb and LTE-Mb did not cross-adhere. These results indicate the existence of two independent, noncomplementing, adhesion systems, and suggest that the differential treatments preserve or activate one system while destroying the other. Myoblasts dissociated with 2.5 mM EDTA in the absence of exogenous trypsin (E-Mb) have both adhesion systems active on their surfaces, as do Mb grown in Ca2+-free medium and then dissociated with 0.7 mM EDTA (Knudsen, K. A., and Horwitz, A. F., Dev. Biol. 58, 328-338, 1977). Although aggregation of E-Mb is largely Ca2+ independent and that of Knudsen/Horwitz-Mb is largely Ca2+ dependent, they adhere well to each other and to LTE-Mb while segregating from TC-Mb. Fibroblasts also have dual adhesion systems, one Ca2+ dependent and the other Ca2+ independent, but TC-Fb do not cross-adhere to TC-Mb (nor E-Fb to E-Mb). Cell type-specific adhesive selectivity may thus contribute to the selectivity of myocyte fusion.
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Knudsen KA. The calcium-dependent myoblast adhesion that precedes cell fusion is mediated by glycoproteins. J Biophys Biochem Cytol 1985; 101:891-7. [PMID: 4030897 PMCID: PMC2113721 DOI: 10.1083/jcb.101.3.891] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Presumptive myoblasts from explants of chick embryo pectoral muscle proliferate, differentiate, and fuse to form multinucleate myotubes. One event critical to multinucleate cell formation is the specific adhesion of myoblasts before union of their membranes. In the studies reported here five known inhibitors of myotube formation--trifluoperazine, sodium butyrate, chloroquine, 1,10 phenanthroline, and tunicamycin--were tested for their effect on the Ca++-dependent myoblast adhesion step. The first four inhibitors of myotube formation do not perturb myoblast adhesion but rather block fusion of aggregated cells, which suggests that these agents perturb molecular events required for the union of the lipid bilayers. By contrast, tunicamycin exerts its effect by inhibiting the myoblast adhesion step, thereby blocking myotube formation. The effect of tunicamycin can be blocked by a protease inhibitor, however, which implies that the carbohydrate residues protect the glycoproteins from proteolytic degradation rather than participate directly in cell-cell adhesion. Whereas trypsin treatment of myoblasts in the absence of Ca++ destroys the cells' ability to exhibit Ca++-dependent adhesion, the presence of Ca++ during trypsin treatment inhibits the enzyme's effect, which suggests that myoblast adhesion is mediated by a glycoprotein(s) that has a conformation affected by Ca++. Finally, myoblast adhesion is inhibited by an antiserum raised against fusion-competent myoblasts. The effect of the antiserum is blocked by a fraction from the detergent extract of pectoral muscle that binds to immobilized wheat germ agglutinin, which again suggests that glycoproteins mediate Ca++-dependent myoblast adhesion.
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Hatta K, Okada TS, Takeichi M. A monoclonal antibody disrupting calcium-dependent cell-cell adhesion of brain tissues: possible role of its target antigen in animal pattern formation. Proc Natl Acad Sci U S A 1985; 82:2789-93. [PMID: 3857614 PMCID: PMC397651 DOI: 10.1073/pnas.82.9.2789] [Citation(s) in RCA: 141] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The Ca2+-dependent cell-cell adhesion system (CDS) is thought to be essential for the formation and maintenance of cell adhesion in a wide variety of tissues. Previous studies suggested that CDS has some cell-type specificity; for example, the monoclonal antibody ECCD-1 selectively recognizes CDS of certain epithelial tissues in mouse embryos but not nervous tissues. In the present study, we have obtained a monoclonal antibody, designated NCD-1, that disrupts connections between brain cells of mouse embryos. A series of experiments suggested that NCD-1 specifically recognizes CDS. We then determined the distribution of the NCD-1 antigen in various mouse tissues. NCD-1 reacted with cells of the following tissues and cell lines: nervous tissues from various sources, lens, striated muscle, cardiac muscle, glioma G26-20, adrenocortical tumor Y1, and melanoma B16. None of these cells reacted with ECCD-1, and the cells reactive with ECCD-1 did not react with NCD-1. There was also a class of cells that did not react with either ECCD-1 or NCD-1. These results suggest that cells in the body can be classified into at least three groups containing CDS of differing specificities. A map of the tissue localization of these different classes of CDS also suggests that the expression of cell-type-specific cell adhesion molecules in each tissue plays a crucial role in adhesion between the same cell types and segregation of different cell types in processes essential for animal morphogenesis.
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Fausto-Sterling A, Muckenthaler FA, Hsieh L, Rosenblatt PL. Some determinants of cellular adhesiveness in an embryonic cell line from Drosophila melanogaster. THE JOURNAL OF EXPERIMENTAL ZOOLOGY 1985; 234:47-55. [PMID: 3921653 DOI: 10.1002/jez.1402340107] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We have examined, under a number of conditions, the aggregation behavior of Schneider Line 2 cells established originally from embryos of Drosophila melanogaster. The work presented in this paper further establishes appropriate conditions for the study of cellular adhesion in Drosophila cell lines; shows that the adhesive capacity of Drosophila cell line cells, under our experimental conditions, depends upon the presence of CA2+ but not Mg2+; shows that Drosophila cell line cells will not aggregate in the cold; and shows that trypsin treatment inhibits the aggregation of cell line cells, although high concentrations of calcium ions interfere with the action of trypsin.
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Sep�lveda MS, Doggenweiler C, Izquierdo L. Scanning microscopy of disaggregated and aggregated preimplantation mouse embryos. ACTA ACUST UNITED AC 1985. [DOI: 10.1007/bf00868145] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Yoshida-Noro C, Suzuki N, Takeichi M. Molecular nature of the calcium-dependent cell-cell adhesion system in mouse teratocarcinoma and embryonic cells studied with a monoclonal antibody. Dev Biol 1984; 101:19-27. [PMID: 6692973 DOI: 10.1016/0012-1606(84)90112-x] [Citation(s) in RCA: 241] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The molecular nature of the Ca2+-dependent cell-cell adhesion system in mouse teratocarcinoma (t-CDS) was studied using a monoclonal antibody recognizing t-CDS. We isolated a hybridoma clone producing a monoclonal antibody (ECCD-1) able to disrupt cell-cell adhesion when added to monolayer cultures of teratocarcinoma cells. This antibody bound to the cells with intact t-CDS, resulting in an inhibition of their aggregation, but did not bind to cells from which t-CDS was removed by trypsin treatment in the absence of Ca2+. The binding of ECCD-1 to cell surfaces required Ca2+ but not other ions. Western blot analysis showed that ECCD-1 recognizes multiple cell surface proteins, the major one of which is a component with a molecular weight of 124,000. The binding of ECCD-1 to these antigens was Ca2+-dependent even in cell-free systems, suggesting that the molecules involved in t-CDS undergo conformational changes by binding with Ca2+, leading to conversion of their molecular structure into an active form. ECCD-1 also reacted with 8-cell stage mouse embryos and with certain types of epithelial cells (excluding fibroblastic cells) in various differentiated tissues collected from mouse fetuses, again affecting their cell-cell adhesion. We also showed that a monoclonal antibody (DE1) raised against gp84 (F. Hyafil et al., 1981, Cell 26, 447-454) recognizes the same antigens as ECCD-1.
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Abstract
Trypsinized cells from embryonic chick neural retina redistributed concanavalin A receptors to patches and caps. Between 12 and 16 days of development, the ability to redistribute concanavalin A receptors declined. This restriction in mobility of the receptors was accompanied by changes in susceptibility to the capping-inhibitory drugs colchicine and cytochalasin B.
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Ogou S, Okada TS, Takeichi M. Cleavage stage mouse embryos share a common cell adhesion system with teratocarcinoma cells. Dev Biol 1982; 92:521-8. [PMID: 7117698 DOI: 10.1016/0012-1606(82)90196-8] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Watanabe M, Bertolini DR, Kew D, Turner RS. Changes in the nature of the cell adhesions of the sea urchin embryo. Dev Biol 1982; 91:278-85. [PMID: 6896501 DOI: 10.1016/0012-1606(82)90034-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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