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  • 1
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Pour qu'un modèle d'invasion tumorale soit valable, il faut que les cellules adhèrent à la membrane basale épithéliale et que des composantes du matrix extracellulaire facilitent le largage des protéases permettant aux cellules cancéreuses d'envahir le substratum. Cette adhésion est soue le contrôle des intégrines béta 1, une famille de récepteurs pour les substrats tels que le collagène, la laminine et la fibronectine. Pour étudier l'invasion tumorale dans le cancer folliculaire de la thyroïde (CFT), nous avons employé des cellules dérivées d'un CFT primitif (CFT-133), de métastases cervicales (CFT-236) et pulmonaires (CFT-238) d'un seul patient. L'invasionin vitro a été déterminée comme la capacité des cellules tumorales de pénétrer le Matrigel TM, évaluée en microscopie électronique. Cette invasion a été nulle pour les cellules CFT-133, modérée pour les CFT-236 et importante pour les CFT-238. L'immunoprécipitation avec des anticorps monoclonaux vis-à-vis des sous-unités d'intégrine béta-1 et SDS-PAGE a montré que la synthèse était augmentée; la cytométrie de flux a démontré une expression accrue de cette sous-unité en CFT-236 et CFT-238 comparée à des cellules CFT-133. L'activité protéolytique a été évaluée par la zymographie en gélatine. L'extrait de cellules CFT-238 et le média conditionné (MC) contenaient un groupe plus complexe de protéases telles une collagènase de type I et une stromélysine activées comparées à des clones moins invasifs. Les gélatinases 72 kd et 92 kd, cependant, telles les collagénases du type IV, étaient présentes dans les MC des trois lignées. En conclusion, l'invasionin vitro est similaire aux métastasesin vivo par les cellules source des lignées cellulaires CFT-133/236/238. La capacité d'envahir la membrane basale est correlée avec l'augmentation de la synthèse et de l'expression des intégrines béta 1 et l'activation des protéases tumorales.
    Abstract: Resumen Un modelo válido de invasión tumoral requiere que las células adhieran a la membrana basal y que los componentes de la matriz extracelular activen la liberación de proteasas para que las células cancerosas puedan invadir el sustrato. La adherencia es mediada por las integrinasβ-1, una familia de receptores a sustratos tales como colágeno, laminina y fibronectina, todos componentes de la membrana basal o de la matriz extracelular. Con el objeto de estudiar la invasión tumoral en el cáncer folicular de la glándula tiroides (CFT), utilizamos líneas celulares derivadas del tumor primario de un paciente único con CFT (CFT-133), de las metástasis ganglionares cervicales (CFT-236) y de las metástasis pulmonares (CFT-238). La invasiónin vitro, determinada por la capacidad de las células tumorales de penetrar Matrigel, fue valorada mediante microscopía electrónica de barrido: CFT-133 no presentó invasión, CFT-236 apareció moderadamente invasivo y CFT-238 apareció altamente invasivo. La inmunoprecipitación con un anticuerpo monoclonal contra subunidades de integrinaβ-1 y SDS-PAGE demostró incremento en la síntesis, y la citometría de flujo demostró incremento de la expresión de esta subunidad en CFT-236 y en CFT-238, en comparación con CFT-133. La actividad proteolítica fue valorada por zimografía de gelatina. El extracto de CFT-238 y el medio condicionado (MC) exhibieron una mayor variedad de proteasas consistente con colagenasa activada tipo I y estromelisina, en comparación con con los clones menos invasivos; sin embargo, las colagenasas kd 72 y 92, consistentes con colagenasas tipo IV, estuvieron presentes en los MC de las tres líneas celulares. En conclusión, la invasiónin vitro se correlaciona con las metástasisin vivo por las células fuente en las líneas celulares CFT133/236/238. La capacidad para invadir la membrana basal de la preparación se correlaciona con síntesis y expresión incrementadas de las integrinasβ-1 y activación de las proteasas tumorales.
    Notes: Abstract A recognized model of tumor invasion requires cells to adhere to epithelial basement membrane and extracellular matrix components triggering release of proteases thus allowing cancer cells to invade the substrate. This adhesion is mediated byβ 1 integrins, a family of receptors to substrates such as collagen, laminin, and fibronectin. In order to study tumor invasion in follicular thyroid cancer (FTC), we used cell lines derived from a single patient's FTC primary tumor (FTC-133), neck lymph node metastases (FTC-236), and lung metastases (FTC-238).In vitro invasion as determined by the ability of the tumor cells to penetrate Matrigel® was assessed by scanning electron microscopy. FTC-133 did not invade, FTC-236 was moderately invasive, and FTC-238 was highly invasive. Immunoprecipation with a monoclonal antibody toβ 1 integrin subunits and SDS-PAGE showed increased synthesis and flow cytometry showed increased expression of this subunit in FTC-236 and FTC-238 compared to FTC-133. Proteolytic activity was assessed by gelatin zymography. FTC-238 cell extract and conditioned media exhibited a more complex array of proteases consistent with activated type I collagenase and stromelysin compared to the less invasive clones, however 72 and 92 kd gelatinases consistent with type IV collagenases were present in the conditioned media from all three lines. In conclusion,in vitro invasion parallelsin vivo metastasis by the source cells in the FTC-133/236/238 cell-lines. The ability to invade basement membrane preparation correlates with increased synthesis and expression ofβ 1 integrins and activation of tumor proteases.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 18 (1982), S. 1-13 
    ISSN: 0730-2312
    Keywords: cell-substratum adhesion ; cell surface ; integral membrane glycoproteins ; conserved structure ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Broad spectrum antisera have been raised against surface membrane-derived material from baby hamster kidney cells and mouse mammary tumor epithelial cells. These antisera disrupt cell-substratum adhesion in their respective cell types. Using an antibody neutralization (blocking) assay, adhesion-related glycoproteins have been isolated from non-ionic detergent extracts of each cell type. The purified material in each case consisted of a restricted population of glycoproteins of approximately 120,000-160,000 Mr. Purified material from each system blocked the disruption of adhesion induced by the heterologous antiserum on either cell type. The antisera were capable of disrupting cell-substratum adhesion of a large number of cell types and species sources. In addition, antibody blocking activity could be detected from partially purified extracts of several adult hamster cell types and a variety-of cultured cell types. Thus, in addition to having similar substratum-associated glycoproteins (eg, fibronectin) and cytoskeleton-associated proteins (eg, α-actinin and vinculin) cells from different species and tissue sources appear to have a relatively conserved class of integral membrane glycoproteins involved in cell substratum-adhesion.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 34 (1987), S. 187-202 
    ISSN: 0730-2312
    Keywords: calcium-dependent cell adhesion ; epithelial cells ; cell-CAM 120/80 ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Calcium-dependent cell adhesion molecules (CAMs) mediate intercellular adhesion in epithelial cells and in preimplantation mammalian embryos. One of these molecules, cell-CAM 120/80, is found on cells as a 120-kd membrane glycoprotein and as a soluble 80-kd species in conditioned culture medium [Damsky et al: Cell 34:455, 1983]. We have purified to homogeneity the soluble 80-kd fragment of cell-CAM 120/80 by using monoclonal antibody affinity chromatography. We have shown that the purified molecule can disrupt cell-cell adhesion in cultured epithelial cells, thus indicating that it is directly involved in the adhesive process. In addition, we have further characterized both the 120-kd cell-associated molecule and its 80-kd fragment, including N-terminal sequence analysis.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 18 (1982), S. 157-167 
    ISSN: 0730-2312
    Keywords: cell adhesion ; surface membrane antigens ; nonadherent melanoma cells ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The existence of integral membrane components that are involved in cell-substratum adhesion has been postulated. Using an immunochemical approach developed in this laboratory, we provide further evidence for the role in cell-substratum adhesion of integral membrane glycoproteins within a molecular weight region of 120,000-140,000. Sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis of material enriched approximately 100-fold in adhesion-related components revealed the 120,000-140,000 Mr glycoproteins in an adherent hamster melanoma cell line. These glycoproteins are greatly reduced in a non-adherent variant. Induction of adhesion in these cells by exposure to BudR is accompanied by re-expression of the surface adhesion antigens.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0730-2312
    Keywords: adhesion ; migration ; protease ; lymphocyte ; immunity ; connective tissue ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Human T lymphoblastoma cells of the CD4+ 8+ Tsup-1 line, that express alpha4 and alpha5 but not alpha6 integrins of the beta1 family, and CD4+ human blood T cells bind vasoactive intestinal peptide (VIP) with high affinity, leading to increased adherence, secretion of matrix metalloproteinases (MMPs), and chemotaxis. VIP-enhanced adherence of T cells to fibronectin was inhibited significantly by neutralizing monoclonal antibodies to beta1 〉 alpha4 〉〉 alpha5, but not to alpha6. Antibodies to beta1 and alpha4 suppressed to a similarly significant extent VIP stimulation of both MMP-dependent T cell chemotaxis through fibronectin-enriched Matrigel and T cell degradation of 3H-type IV collagen in the Matrigel, without affecting VIP-evoked secretion of MMP by suspensions of T cells. The lesser inhibition of VIP-enhanced adherence of T cells to fibronectin by anti-alpha5 antibody, than antibodies to beta1 or alpha4 chains, was associated with lesser or no suppression of MMP-dependent T cell chemotaxis through Matrigel and T cell degradation of type IV collagen in the Matrigel in response to VIP. Specific beta1 integrins thus mediate interactions of stimulated T cells with basement membranes, including adherence, localized digestion by MMPs, and chemotactic passage, that promote entry of T cells into extravascular tissues. © 1996 Wiley-Liss, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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