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    Effect of oral tamoxifen on the healing of corrosive oesophageal burns in an experimental rat model
    (Oxford Univ Press, 2014) Elmas, Onur; Cevik, Muazzez; Demir, Tuncer; Ketani, Muzaffer A.
    OBJECTIVES: Corrosive oesophagitis is a common health problem in children. Scar tissue can develop during the recovery period, and as a result, serious narrowing of the oesophagus can develop, in turn causing morbidity and mortality. In previous studies, it was argued that tamoxifen (TAM) may have antifibrotic effects beyond its oestrogen antagonist or agonist properties. We aimed to examine the possible effects of TAM on fibrosis and stricture formation, which are complications of corrosive oesophagitis. METHODS: Three study groups were formed as follows: a non-oesophageal burn group (NON-EB, n = 6), an oesophageal burn group (EB, n = 6) and an oesophageal burn + tamoxifen group (EB-TAM, n = 6). In the NON-EB rats, the oesophageal lumen was washed with 0.9% NaCl while, in the EB and EB-TAM rats, the distal oesophagus was burned with a 50% NaOH solution. After application of this solution to the EB-TAM group rats, 0.4 mg/kg/day of TAM was administered via gavage for 7 days. Twenty-two days later, the rat oesophagi were examined histopathologically for inflammation, granulation, collagen deposition and stenosis. RESULTS: In the EB group rats, the inflammation, collagen deposition and stenosis scores increased compared with those of the other groups. In the EB-TAM group, these three scores were lower compared with those of the EB group rats, but higher compared with those of the NON-EB group rats. No significant difference was observed in the granulation scores between the EB and EB-TAM groups. It was also observed that the EB-TAM group rats gained more weight than those in the EB group. CONCLUSIONS: According to the data obtained, TAM use prevents inflammation, collagenization and stricture development. TAM may be a useful medicine in the treatment of corrosive oesophagitis.
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    Expression and localisation of epidermal growth factor receptors and their ligands in the lower genital tract of cycling cows
    (Csiro Publishing, 2019) Sagsoz, Hakan; Liman, Narin; Saruhan, Berna Guney; Akbalik, Mehmet E.; Ketani, Muzaffer A.; Topaloglu, Ugur
    The epidermal growth factor receptor (ErbB) family and its ligands are essential for the regulation of multiple cellular processes required for mammalian reproduction. The objectives of this study were to investigate the expression and localisation of ErbB subtypes (ErbB1-4) and selected ligands, namely epidermal growth factor (EGF), amphiregulin (AREG) and neuregulin (NRG), in the cervix and vagina of cycling cows and to determine possible steroid hormone-dependence of their expression using immunohistochemistry. All four ErbBs and EGF, AREG and NRG proteins were found to be localised in the nucleus and cytoplasm of different cells in the cervix and vagina, and their expression differed during the oestrous cycle. During the follicular phase, in both the cervix and vagina, ErbB1, ErbB2, ErbB3, ErbB4 and EGF expression was higher in the luminal epithelium (LE) than in stromal and smooth muscle (SM) cells (P<0.05). During the luteal phase, the expression of ErbB1, ErbB3 and EGF in the LE was significantly different from that in stromal and SM cells in the cervix, whereas the expression of EGF and AREG differed in the vagina compared to the cervix (P<0.05). Throughout the oestrous cycle, in both the cervix and vagina, although ErbB2/human epidermal growth factor receptor 2 expression in the LE and SM cells was significantly higher than in the stromal cells (P<0.05), NRG expression was similar in the LE, stromal and SM cells (P>0.05). Overall, these results suggest that all four ErbBs and the EGF, AREG and NRG proteins may collectively contribute to several cellular processes in the bovine cervix and vagina during the oestrous cycle.
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    Histological Changes to the Rat Mandibular Condyle in Response to Long-term Exposure to an Extremely Low Frequency Magnetic Field
    (Univ Indonesia, 2019) Tacir, Ibrahim H.; Ulku, Sabiha Z.; Ketani, Muzaffer A.; Akdag, Mehmet Z.
    Background: The need for electrical power continues to increase along with the rapidly growing economies of industrialized countries. However, the effects of electrical fields (EFs) on human health remain unclear. Hence, the aim of the present study is to evaluate the histological effects of an extremely low frequency magnetic field (ELF-MF) on the rat mandibular condyle. Methods: Twenty female Sprague-Dawley rats were randomly allocated to one of two groups (n = 10): an untreated control group and an ELF-MF group exposed to a 1.5-mT ELF-MF for 4 h per day for 6 months. After exposure, the left mandibular condyles of all rats were collected for histopathological examinations. Results: The histopathological changes to the ELF-MF group included a non-homogenous appearance and decreased thickness of the hypertrophic layer, irregular appearances of bone marrow cavities, significant deterioration, and delayed calcification and ossification. There were no significant differences in the thicknesses or histomorphometric appearances of the fibrotic, proliferative, and hypertrophic layers of the mandibular condyle of rats between the groups (p = 0.05). Conclusion: Long-term ELF-MF exposure can induce histopathological changes to the mandibular condyle of rats.