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  • 1
    Electronic Resource
    Electronic Resource
    Loss of claudin-1 expression in tumor-associated vessels correlates with acquisition of metastatic phenotype in melanocytic neoplasms (2005)
    Oxford, UK; Malden, USA : Munksgaard International Publishers
    Journal of cutaneous pathology 32 (2005), S. 0 
    Details
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract:  Claudins are a family of transmembrane proteins involved in cell-to-cell adhesion and are believed to be the main component of tight junctions. Recent studies have suggested that some metastatic solid tumors lack claudin expression. It is unknown whether claudins play a role in cutaneous melanoma. Immunohistochemical studies were performed on tissue microarrays containing 19 benign melanocytic nevi (BN), 21 dysplastic nevi (DN), 23 primary malignant melanomas (MMs), and 31 metastatic melanomas (MMMs) using a polyclonal anti-claudin-1 antibody. Immunoreactivity in tumor cells and associated vessels was graded by intensity and by percentage of reactive cells. Normal epidermis served as internal control (3+ labeling). Cases with at least 2+ labeling in more than 25% of the cells were considered positive. Claudin-1 expression was present in 37% of BN, 24% of DN, 26% of MM, and 3.2% of MMM. Tumor-associated vessels showed the following results: 11 of 19 (58%) in BN, 14 of 21 (67%) in DN, 17 of 23 (74%) in MM, and 6 of 31 (19%) in MMM. A significant loss of expression was noted between MMM and all other lesions in tumor cells and associated vessels. There was no significant difference between BN, DN, and MM. Within primary melanomas, there was a significant correlation between expression of claudin in tumor cells and Clark level/Breslow thickness. Also significant was a decreased expression of claudin in tumor vessels of lesions with higher Breslow thickness or Clark level. These data suggest that loss of claudin-1 may play a significant role in the acquisition of metastatic phenotype in cutaneous melanoma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0303-6987.2005.00324.x
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of protein tyrosine kinase expression in melanocytic lesions by tissue array (2003)
    Oxford, UK : Munksgaard International Publishers
    Journal of cutaneous pathology 30 (2003), S. 0 
    Details
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background:  It has been proposed that melanoma progression involves a multistep process from benign nevi (BN), dysplastic nevi (DN), radial and vertical growth phase melanoma (MM) to metastatic melanoma (MMM). Protein tyrosine kinases (PTKs) may participate in this progression.Methods:  Tissue microarray blocks of 89 melanocytic lesions were evaluated by immunohistochemistry for the expression of selected PTKs: c-kit, c-abl, abl-related gene (ARG), platelet-derived growth factor receptors α (PDGFR-α) and β (PDGFR-β).Results:  Seventeen of 31 (55%) MMM lacked expression of c-kit versus 100% expression (18/18) in DN and 96% expression (22/23) in MM; similarly, only 59% (10/17) of BN showed expression of c-kit. PDGFR-β expression levels were similar in BN, DN, and MM, but lower in MMM. There was a trend toward lower expression of abl and ARG from BN to MMM. There was a marked decrease in staining intensity of ARG from BN to DN, MM, and MMM.Conclusion:  Our results support that BN is different from DN and MM and that these two are different from MMM. Metastasis appears to be associated with loss of c-kit and PDGFR-β expression. Since malignant melanoma expresses PTK, it may be a candidate for treatment with anti-PTK, such as STI-571 (Gleevec).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0560.2003.00090.x
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  • 3
    Electronic Resource
    Electronic Resource
    Expression of insulin-like growth factor-binding protein 2 in melanocytic lesions (2003)
    Oxford, UK : Munksgaard International Publishers
    Journal of cutaneous pathology 30 (2003), S. 0 
    Details
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background:  Insulin-like growth factor-1 (IGF-1) is one of the most critical proteins required for the survival, migration, and growth of melanoma cells. IGF-binding protein 2 (IGFBP2), which binds and regulates the function of IGF-1, is upregulated in a dose-dependent manner in melanoma cells treated with IGF-1, suggesting a possible role of IGFBP2 in the pathogenesis of melanoma.Methods:  Tissue microarrays were constructed using formalin-fixed, paraffin-embedded archival tissue blocks from 94 melanocytic lesions: 20 benign nevi, 20 dysplastic nevi, 23 primary melanomas, and 31 metastatic melanomas. IGFBP2 expression was evaluated immunohistochemically using a polyclonal antibody against the C-terminus of IGFBP2. The number of cells and labeling intensity were assessed semiquantitatively.Results:  Positive IGFBP2 labeling was observed in 5.0% of benign nevi, which was significantly lower than in dysplastic nevi (35.0%), primary melanomas (52.2%), or metastatic melanomas (54.8%) (p 〈 0.05). Among the IGFBP2-positive cases, moderate-to-strong immunostaining was observed in 64.7% of metastatic melanomas and 33.3% of primary melanomas. But none of the dysplastic nevi had moderate-to-strong immunostaining (p 〈 0.05).Conclusions:  Our study shows that IGFBP2 expression increases from benign and dysplastic nevi to primary and metastatic melanomas and suggests that it may play a role in melanoma progression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0560.2003.00120.x
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    Paper (German National Licenses)
    Fulltext
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