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    Colonic fibronectin and E-cadherin in mild ulcerative colitis
    (Comenius Univ, 2021) Sarpdag, F.; Yonem, O.; Aktas, A.; Seckin, Y.; Tuncer, E.; Ozer, H.
    BACKGROUND: Although fibronectin has an important role in wound repair, nearly no human studies to date have investigated its condition in ulcerative colitis (UC) histologically. E-cadherin plays a critical role in the repair of normal epithelial tissues. This study aims to find out the condition of these two molecules in UC. MATERIAL AND METHODS: The records of 22 UC patients during the period of 2004-2009 were retrospectively analyzed. We also included 24 patients with sporadic colorectal cancer (SCC) and 24 patients with normal colonoscopic biopsies who served as the control group. Colonoscopic biopsies were stained with E-cadherin and fibronectin. RESULTS: The E-cadherin loss was significantly more prominent in the SCC group, followed by the UC group and control group. The situation was reverse for fibronectin. We also observed that while the E-cadherin loss was still ongoing in all of the endoscopically inactive cases, the fibronectin staining resembled the staining pattern of normal individuals in ten out of thirteen UC patients. CONCLUSION: We suggest that the decrease in E-cadherin, even in the inactive period, might be the cause of why UC is not just a compensatory change in repair of inflammation. The results of staining with fibronectin in UC patients were between normal individuals and SCC patients. Further studies are necessary to confirm our results (Tab. 2, Fig. 6, Ref. 15).
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    Expression of claudin-4 and ?-catenin in gastric premalignant lesions
    (Univ Catholique Louvain-Ucl, 2009) Seckin, Y.; Arici, S.; Harputluoglu, M.; Yonem, O.; Yimaz, A.; Ozer, H.; Karincaoglu, M.
    Background and study aims : Abnormal expression of claudin-4 and beta-catenin play a role in carcinogenesis. The purpose of the present study was to examine claudin-4 and beta-catenin expression in normal and precancerous gastric mucosa. Patients and methods : Endoscopic biopsy specimens [normal gastric mucosa (n = 22), intestinal metaplasia (n = 24), dysplasia (n = 18), Helicobacter pylori (H. pylori)-associated chronic gastritis (n = 32) and remnant gastric mucosa (n = 18)] obtained from different 114 patients were examined by immunohistochemistry. Results : Claudin-4 expression was present in 94.4% of dysplasia, 87.5% of intestinal metaplasia, 62.5% H. pylori-associated chronic gastritis, and 88.9% remnant gastric mucosa but only 18.2% of normal gastric mucosa biopsies. Decreased expression of beta-catenin was present in 27.8% of dysplasia, 8.3% of intestinal metaplasia, 15.6% of H. pylori-associated chronic gastritis, and 22.2% of remnant gastric mucosa biopsies, but was not present in normal gastric mucosa. When compared with normal gastric mucosa, there was a significant difference in claudin-4 expression in all groups (P < 0.05), but a significant difference was detected in dysplasia and remnant gastric mucosa for beta-catenin (P < 0.05). Conclusions : Our results suggest that claudin-4 expression is upregulated in premalignant gastric alterations. (Acta gastroenterol. belg., 2009, 72, 407-412).