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박호성,장규윤,김경열,이학용,Tarnawski Andrzej S.,Majumdar Adhip P. N.,강명재,이동근,문우성 대한병리학회 2005 Journal of Pathology and Translational Medicine Vol.39 No.6
Background : It has been well demonstrated that the overexpression of epidermal growth factor receptor (EGFR) is associated with numerous gastrointestinal malignancies, including gallbladder carcinoma. However, the cellular events that regulate EGFR in cancer cells have not been fully elucidated. A novel negative regulator of EGFR that is referred to as EGFR related protein (ERRP) has recently been identified. The aim of this study was to investigate the expression and localization of ERRP in gallbladder carcinoma and to examine a possible role for ERRP. Methods : We examined the immunohistochemical expressions of ERRP, p53 and proliferating cell nuclear antigen labeling index (PCNA-LI) in formalin-fixed, paraffinembedded specimens of 43 cases of gallbladder carcinoma, 7 cases of adenoma and 3 cases of dysplasia. Results : In the normal mucosa, ERRP immunoreactivity was positive in over 64% of specimens. In contrast, the ERRP staining was positive in only 46% of the cancer specimens. The expression of ERRP in cancer cells was inversely correlated with tumor cell proliferation. The loss of ERRP expression correlated with the p53 overexpression. Conclusions : Our data indicate that the down-regulation or loss of ERRP could play an important role in the progression of gallbladder carcinoma. The inverse relationship between the ERRP expression and PCNA-LI suggests that ERRP may play a role in the inhibition of tumor cell proliferation in gallbladder cancer.
Co-Expression of Cox-2, C-Met and β-catenin in Cells Forming Invasive front of Gallbladder Cancer
Woo Sung Moon,이호,Rama Pai,Andrzej S. Tarnawski,Kyung Ryoul Kim,Kyu Yun Jang,Ho Sung Park 대한암학회 2005 Cancer Research and Treatment Vol.37 No.3
Purpose: Gallbladder cancer is a malignancy with poor prognosis, predominantly resulting from invasion and metastasis. Our previous studies have demonstrated that prostaglandin E2 (PGE2), generated by cyclooxygenase 2 (Cox-2), transactivates epidermal growth factor receptor(EGFR), c-Met and β-catenin; thus, enhancing colon cancer cell growth and invasiveness in vitro. To determine whether these findings are applicable to clinical conditions, we examined the expression and cellular localization/co-localization of Cox-2, c-Met, β-catenin, EGFR and c-erbB2 in gallbladder cancer.Materials and Methods: Thirty-five specimens of invasive gallbladder cancer, 8 in situ carcinoma and 7 adenoma specimens were immunostained with specific antibodies against Cox-2, c-Met, β-catenin, EGFR and c-erbB2. The cellular distribution, localization and colocalization were examined, and the signal intensities quantified in: a) the central area of gallbladder cancer and b) cancer cells forming the invasive front.Results: Cox-2, c-Met, β-catenin, c-erbB2 and EGFR were over-expressed in 80, 74, 71, 62 and 11% of invasive gallbladder cancers, respectively. β-catenin was expressed in 80% of non-malignant specimens, exclusively in the cell membrane, while the cancer specimens showed cytoplasmic and/or nuclear staining. Significantly higher Cox-2, c-Met and β-catenin expressions were present in cancer cells of the invasive front than in the tumor central areas (p〈0.001), and these expressions were significantly (p=0.01) associated with the invasion depth. Coexpressions of Cox-2, c-Met, β-catenin and c-erbB2 were present in 42% of the specimens in cancer cells forming the invasive front.Conclusion: The overexpressions, and often co-localizations, of Cox-2, c-Met and β-catenin in cancer cells forming the invasive front indicate their local interactions and important roles in invasion. invasion.