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    Effects of Ischemia/Reperfusion on ? Cells of Pancreas and Protective Effects of Melatonin Treatment
    (Soc Chilena Anatomia, 2009) Yildirim, Ayse; Tuncer, Mehmet Cudi; Pamukcu, Oezlem; Aktas, Ayfer; Akkus, Murat
    Oxygen free radicals are considered to be important components involved in the pathophysiological tissue alterations observed during ischemia-reperfusion (I/R). In this study, we investigated the putative protective effects of melatonin treatment on pancreatic I/R injury. Sprague Dawley male rats were subjected to 30 min of pancreatic pedicle occlusion followed by 90 min reperfusion. Melatonin (10 mg/kg. s.c) was administrated 30 min prior to ischemia or I/R application. At the end of the reperfusion periods, rats were decapitated. Pancreatic samples were taken for transmission electron microscopy. The results indicated that ischemia created b cell damage as evidenced by dilatation between the nucleus inner and outer membrane and degeneration on islets of Langerhans cells, was reversed by melatonin treatment. As melatonin administration reversed these microscopic damage, it seems likely that melatonin protects pancreatic tissue against oxidative damage.
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    Effects of ischemia/reperfusion on ß cells of pancreas and protective effects of melatonin treatment
    (Universidad de la Frontera, 2009) Yildirim, Ayse; Tuncer, Mehmet Cudi; Pamukçu, Özlem; Aktas, Ayfer; Akkus, Murat
    Oxygen free radicals are considered to be important components involved in the pathophysiological tissue alterations observed during ischemia-reperfusion (I/R). In this study, we investigated the putative protective effects of melatonin treatment on pancreatic I/R injury. Sprague Dawley male rats were subjected to 30 min of pancreatic pedicle occlusion followed by 90 min reperfusion. Melatonin (10 mg/kg. s.c) was administrated 30 min prior to ischemia or I/R application. At the end of the reperfusion periods, rats were decapitated. Pancreatic samples were taken for transmission electron microscopy. The results indicated that ischemia created b cell damage as evidenced by dilatation between the nucleus inner and outer membrane and degeneration on islets of Langerhans cells, was reversed by melatonin treatment. As melatonin administration reversed these microscopic damage, it seems likely that melatonin protects pancreatic tissue against oxidative damage.
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    Immunohistochemical Analysis of MCC, TARC and CD 104 Antigens in Human Lung Tissue
    (Ortadogu Ad Pres & Publ Co, 2010) Korkmaz, Metin; Akkus, Murat; Yildirim, Ayse; Baran, Ozlem Pamukcu; Aktas, Ayfer
    Objective: The aim of this study was to investigate the the distribution of CMA 1 protein (MCC), CCL17 protein (TARC) and Integrin beta 4 (CD 104) monoclonal antibodies in normal adult human lung tissue. Material and Methods: In this study we examined the lung biopsy specimens obtained from the adult patients who underwent operations for different reasons in the Department of Lung Surgery at Dicle University Hospital, Diyarbakir, Turkey. The tissue samples were immediately frozen in liquid nitrogen at -196 degrees C. The samples were immunostained by indirect immune peroxidase technique. As primary antibodies, MCC, TARC and CD104 were used. As secondary antibodies, 1:200 rabbit anti - mouse IgG peroxidase diluted in PBS/BSA and 1:100 normal human serum solution were used. Negative control staining was performed using irrelevant mouse monoclonal antibodies omitting the primary antibody step. Sections were examined and photographed by Olympus BH2 light microscope. Results: We observed moderate reaction with vascular endothelial cells and with vascular smooth muscle cells with MCC which was aimed to show overall the presence of human lung mast cells. TARC, which was aimed to express the follicular dentritic cells, moderately reacted with follicular dentritic cells, bronchial smooth muscle cells and vascular endothelial cells. CD104, which is the integrin beta 4 subunit that plays an important role in the adhesion of epithelium to basement membranes, moderately reacted with vascular endothelial cells and mainly reacted with the follicular dentritic cells of bronchi. Conclusion: In our study, it was defined that the expressions of these molecules have important role in understanding the function of human lung tissue. We reached the conclusion that our study, by presenting the difference between the normal lung tissue and pathologic lung tissue with expression the related proteins immunohistochemically may constitute preliminary findings for excluding the diseases like interstisial lung disease or chronic obstructive lung disease for the aim of. Our preliminary findings may shed light on future studies.
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    Protective Effects of Melatonin on Testicular Torsion and Detorsion Damage in Sprague-Dawley Rats
    (Soc Chilena Anatomia, 2011) Aktas, Ayfer; Tuncer, M. Cudi; Yildirim, Ayse; Nergiz, Yusuf; Akkus, Murat
    In this study, we evaluated the ultrastructural findings of testis with systemic administration of different doses of melatonin during ischemic period in a rat model of testicular torsion/detorsion (T/D). Testis ischemia-reperfusion (I/R) injury was induced by torsion of the left testis, with a 720 degrees twisting of the spermatic cord so as to produce a total occlusion of testis for 2.5 hours. Subsequently, the same testis was then detorsioned. According to surgical procedure in each group, unilateral orchiectomies were performed for histopathologic examination. The groups were labelled as control group, torsion group (T), torsion and detorsion group (T/D), torsion-detorsion and melatonin group (T/D+20,50 and 100 mg/kg melatonin). For the histological examination, testicular tissues were fixed in 2.5% glutheraldehyde and postfixation 1% osmic acid solutions. They were examined under transmission electron microscopy after application of contrast stained. In torsion group testis cross-sections, cytoplasm residues of mature sperms and large vacuole-like structures were noticeable. In detorsion group testis cross-sections, dissociations in spermatocide nuclei, many vacuoles and residual particles resulting from organelle degeneration, local voids in cytoplasms of spermatogonia, dilatation in granulated endoplasmic reticulum, large lipid droplets, chromatid particles, along with mitochondrial crystalisis were determined. In the testis cross-sections of the group of T/D+50 mg/kg melatonin administration, sertoli and spermatogonia cells that showed membrane-like structures and cytoplasmic voids were observed. Testis cross-sections of rats that were administered with T/D+50 mg/kg melatonin showed small mitochondrions and vacuole-like structures placed on the edge. Testis cross-sections of rats that were administered with T/D+100 mg/kg melatonin resulted in views similar to those of controls in the microstructural level. As a result, the most effective dose of melatonin, which was used in different doses, for prevention of ischemia/reperfusion damage was found to be 100 mg/kg.