Browsing by Subject "Cell adhesion"
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- PublicationOpen AccessBves: Ten years after(Murcia : F. Hernández, 2009) Hager, Hillari A.; Bader, David M.Bves was discovered in 1999 by two independent laboratories using screens to identify novel genes that were highly expressed in the developing heart (Reese et al., 1999; Andree et al., 2000). As an evolutionarily conserved transmembrane protein, Bves is postulated to play a role in cell adhesion and cell motility. In studies of Bves protein disruption, there have been multiple phenotypes, but few molecular mechanisms have been advanced to explain the underlying cause of these phenotypes. As the molecular function of Bves protein begins to be uncovered, it is now time to review the literature to examine the significance of this work and future directions of study. This review summarizes the literature on this unique protein and explores new and exciting data that support emerging themes on its molecular function.
- PublicationOpen AccessCatenins and their associated proteins in colorectal cancer(Murcia : F. Hernández, 2000) Tucker, E.L.; Pignatelli, M.Colorectal cancer is the second most common cause of cancer mortality in the western world. Colorectal cancer has been well studied, and the genetic steps involved in the adenoma to carcinoma sequence have been well elucidated. The first genetic alteration, found in 85% of adenomas, are mutations in the adenomatous polyposis coli (MC) gene. However, the consequences of this and the exact function of APC in the colon is not fully understood. It has been suggested that APC could function through its regulation of Bcatenin, an ubiquitous cytoskeletal protein with multiple binding specificities resulting in diverse functions including cell growth, adhesion, and migration. Any change in these associations may play a role in colorectal cancer development and progression.
- PublicationOpen AccessE-cadherin, β-catenin, and α2β1 and α3β1 integrin expression in primary oral squamous cell carcinoma and its regional metastasi(F. Hernández y Juan F. Madrid. Universidad de Murcia: Departamento de Biología Celular e Histología, 2015) Quirino Silveira Soares, Mariana; Andrade Mendonça, Juliana; Oliveira Morais, Marília; Rodrigues Leles, Claudio; Carvalho Batista, Aline; Mendonça, Elismauro Francisco. To investigate E-cadherin, β-catenin, and α2β1 and α3β1 integrins in 40 samples of nonmetastatic and metastatic oral squamous cell carcinoma (OSCC) with positive cervical lymph nodes (LN). Immunohistochemistry was used to evaluate expression in the lesion center (LC) and invasive tumor front (ITF) of non-metastatic (n=18) and metastatic (n=22) OSCC and in the LN on the metastatic neoplastic cells (MNC; n=22). In metastatic OSCC, E-cadherin and β-catenin presented significantly lower cytoplasmic membrane expression in the ITF and MNC when compared to the LC and lower cytoplasmic expression in MNC when compared to the LC and ITF (p<0.05). Integrins α2β1 and α3β1 showed high cytoplasmic expression in the LC, ITF and MNC (p>0.05). A positive correlation was observed between E-cadherin cytoplasmic expression and α2β1 (ρ=0.860) and α3β1 (ρ=0.975) expression. When comparing the primary sites of metastatic and non-metastatic disease, β-catenin presented lower cytoplasmic membrane (p=0.013) expression in metastatic OSCC. E-cadherin presented low expression and the integrins high expression in both groups. Abnormal expression of β-catenin and E-cadherin associated with high expression of α2β1 and α3β1 integrins contribute to LN metastasis in OSCC.
- PublicationOpen AccessEvidence for a potential tumor suppressor role for the Na,K-ATPase B1-subunit(Murcia : F. Hernández, 2008) Inge, Landon J.; Rajasekaran, Sigrid A.; Yoshimoto, Koji; Mischel, Paul S.; McBride, William; Landaw, Elliot; Rajasekaran, Ayyappan K.The Na,K-ATPase, consisting of two essential subunits (a, ß), plays a critical role in the regulation of ion homeostasis in mammalian cells. Recent studies indicate that reduced expression of the ß1 isoform (NaK-ß1) is commonly observed in carcinoma and is associated with events involved in cancer progression. In this study, we present evidence that repletion of NaK-ß1 in Moloney sarcoma virustransformed Madin-Darby canine kidney cells (MSVMDCK), a highly tumorigenic cell line, inhibits anchorage independent growth and suppresses tumor formation in immunocompromised mice. Additionally, using an in vitro cell-cell aggregation assay, we showed that cell aggregates of NaK-ß1 subunit expressing MSVMDCK cells have reduced extracellular regulated kinase (ERK) 1/2 activity compared with parental MSV-MDCK cells. Finally, using immunohistochemistry and fully quantitative image analysis approaches, we showed that the levels of phosphorylated ERK 1/2 are inversely correlated to the NaK-ß1 levels in the tumors. These findings reveal for the first time that NaK-ß1 has a potential tumor-suppressor function in epithelial cells.
- PublicationOpen AccessMGRN1 depletion promotes intercellular adhesion in melanoma by upregulation of E-cadherin and inhibition of CDC42.(Elsevier, 2023-11-25) Cerdido, Sonia; Abrisqueta, Marta; Sánchez-Beltrán, José; Lambertos, Ana; Castejón-Griñán, María; Muñoz, Cristina; Olivares, Conchi; García-Borrón, José Carlos; Jiménez-Cervantes, Celia; Herraiz Serrano, Cecilia María; Bioquímica y Biología Molecular B e Inmunología
- PublicationOpen AccessMitochondrial bioenergetics and distribution in living human osteoblasts grown on implant surfaces(Murcia : F. Hernández, 2009) Salido, Mercedes; Vilches Pérez J.Ignacio; González, Juan L.; Vilches, JoséOsseointegration of implants is crucial for the long-term success of oral implants. The periimplant bone formation by osteoblasts is strongly dependent on the local mechanical environment in the interface zone. Robust demands for energy are placed on osteoblasts during the adhesion process to solid surfaces, and mitochondria are capital organelles in the production of most of the ATP needed for the process. We have assessed the relationship between osteoblast differentiation and mitochondrial bioenergetics in living cells grown on two different titanium surfaces, in order to provide valuable information for the design of material surfaces required for the development of the most appropriate osteogenic surface for osteoblastic anchorage. Combined backscattered and fluorescence confocal microscopy showed that in flat cells grown on a machined surface, highly energized mitochondria were distributed along the cell body. In contrast, cells grown on the rough surface emitted long protrusions in search of surface roughness, with actin stress fibers clearly polarized and highly energized mitochondria clustered at focal adhesion sites. This report using normal human osteoblastic cells indicates that these cells are especially sensitive to surface cues through energy production that enhances the necessary adhesion required for a successful osseointegration.
- PublicationOpen AccessMolecules of cell adhesion and extracellular matrix proteolysis in oral squamous cell carcinoma(Murcia : F. Hernández, 2010) Shi, Zonggao; Stack, M. SharonOral squamous cell carcinoma (OSCC) is the most common malignancy of the oral cavity with a poor 5-year survival rate, due in large part to the presence of metastatic disease at initial diagnosis. In recent years, a number of studies have examined the oral tumor microenvironment to asses the potential dynamic balance between extracellular matrix deposition and proteolytic degradation as well as the cellular adhesion molecules that mediate adhesion to matrix and regulate tissue cohesion. The objective of this review is to provide a brief overview of the major matrix components, adhesion molecules and proteolytic enzymes in the oral tumor microenvironment and to summarize recent findings regarding the role of these complex molecular players in oral tumor progression.
- PublicationOpen AccessPrognostic significance of E-cadherin, β-catenin and cyclin D1 in oral squamous cell carcinoma: a tissue microarray study(Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2021) Al-Rawi, Natheer; Al Ani, Muwaffaq; Quadri, Asif; Hamdoon, Zaid; Awwad, Aktham; Al Kawas, Sausan; Al Nuaim, AhmedObjective. To study the prognostic significance of E-cadherin, β-catenin, and cyclin D1 expression in oral squamous cell carcinoma. Subjects and Methods. The study included 65 subjects with histologically confirmed squamous cell carcinoma. TMA blocks were prepared for immunohistochemical quantification of the expression of the three markers using IHC profiler and Immune ratio plugin of Image J. Results. E-cadherin expression was significantly correlated with histological grades and the metastasis status (p<0.05), whereas β-catenin expression was significantly correlated with smoking and tumor recurrence (P<0.05). Cyclin D1 expression was significantly correlated with depth of invasion and tumor recurrence. (p<0.05). Advanced tumor stage and depth of tumor invasion increases the risk of recurrence or death by 2.5 times (OR=2.53 and 0.84 respectively). Conclusion. High expression of β-catenin and cyclin D1 are significantly correlated with tumor recurrence and old age. Depth of invasion, low histological grade and old age were a significant predictor for the risk of having tumor recurrence and cancer related death.
- PublicationOpen AccessThe role of junctional adhesion molecules in cell-cell interactionsThe role of junctional adhesion(Murcia : F. Hernández, 2005) Keiper, T.; Santoso, S.; Nawroth, P.P.; Orlova, V.; Chavakis, T.Cell-cell-interactions are important for the regulation of tissue integrity, the generation of barriers between different tissues and body compartments thereby providing an effective defence against toxic or pathogenic agents, as well as for the regulation of inflammatory cell recruitment. Intercellular interactions are regulated by adhesion receptors on adjacent cells which upon extracellular ligand binding mediate intracellular signals. In the vasculature, neighbouring endothelial cells interact with each other through various adhesion molecules leading to the generation of junctional complexes like tight junctions (TJs) and adherens junctions (AJs) which regulate both leukocyte endothelial interactions and paracellular permeability. In this context, emerging evidence points to the importance of the family of junctional adhesion molecules (JAMs), which are localized in tight junctions of endothelial and epithelial cells and are implicated in the regulation of both leukocyte extravasation as well as junction formation and permeability.