Browsing by Subject "Cadherins"

Now showing 1 - 3 of 3
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    Cadherins down-regulation: towards a better understanding of their relevance in colorectal cancer
    (Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2020) Losi, Lorena; Zanocco-Marani, Tommaso; Grande, Alexis
    The down-regulation of cadherin expression in colorectal cancer (CRC) has been widely studied. However, existing data on cadherin expression are highly variable and its relevance to CRC development has not been completely established. This review examines published studies on cadherins whose downregulation has been already demonstrated in CRC, trying to establish a relationship with promoter methylation, the capacity to influence the Wnt / CTNNB1 (catenin beta 1, beta-catenin) signaling pathway and the clinical implications for disease outcome. Moreover, it also analyses factors that may explain data variability and highlights the importance of considering the altered subcellular localization of the examined cadherins. The results of this survey reveal that thirty of one hundred existing cadherins appear to be down-regulated in CRC. Among these, ten are cadherins, sixteen are protocadherins, equally divided between clustered and non clustered, and four are cadherin - related. These findings suggest that, to better define the role played by cadherin down-regulation in CRC pathogenesis, the expression of multiple rather than individual cadherins should be taken into account and further functional studies are necessary to clarify the relative ability of individual cadherins to inhibit CTNNB1 therefore acting as tumor suppressors.
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    Catenins 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.
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    Simultaneous bilateral breast carcinoma: Histopathological characteristics and CD44/catenin-cadherin profile
    (Murcia : F. Hernández, 2005) Bassarova, A.V.; Torlakovic, E.; Sedloev, T.; Hristova, S.L.; Trifonov, D.Y.; Nesland, Jahn M.
    Aims: Family history of breast carcinoma, multicentric tumor foci in one breast, and in situ lobular carcinoma increase the risk of bilateral breast cancer (BBC), synchronous or metachronous. Synchronous tumors are designated as simultaneous breast carcinoma if they appear at the same time. The CD44 family and cadherin/catenin immunophenotype of this group of BBCs has not yet been evaluated. The aim of this study was to compare clinicopathological characteristics and immunohistochemical profiles of simultaneous BBC and corresponding lymph node metastases in eight patients. Methods and results: In toto 15 primary and 9 metastatic tumors were evaluated. The expression of CD44 variant isoforms, ß-catenin, E, P and N-cadherin were evaluated by immunohistochemistry. Rare types of breast carcinoma were frequent in this group of patients. There were 6 pleomorphic lobular, 5 invasive ductal of usual type, 3 atypical medullary carcinomas, 2 mucinous and one invasive micropapillary carcinoma. The expression CD44v6 was most frequent, followed by CD44v3-10, CD44v5, and CD44v3. CD44v4 was generally not expressed. E-cadherin was expressed in 80% primary tumors, 40% expressed N-cadherin, and 66% expressed P-cadherin. Conclusions: Generally, simultaneous carcinomas had different morphology and different immunophenotype. Each primary tumor was more similar to its corresponding metastatic tumor than to the contralateral primary tumor.