Browsing by Author "Kaymaz, F"

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Ultrastructural effect of sildenafil citrate on corpus cavernosum and other genital organs in female rats
    Kilinç, K; Gündüz, MI; Gümüs, BH; Vatansever, S; Kaymaz, F
    Aim: To determine the ultrastructural effects of sildenafil on the female genital organs. Methods: Twenty female cycling Wistar albino rats weighing 250 +/- 20 g were randomly divided into two groups of 10 each. Rats of one group were gavaged with 0.5 mg.kg(-1).d(-1) of sildenafil 3 days in a week for 4 weeks and the other served as the controls. After cessation of treatment animals were sacrificed by cervical dislocation under methoxyflurane anaesthesia. The clitoris, vagina, uterus and bartholin glands were taken at the estrous and were fixed with 10 % formalin solution for light microscopy and 2.5 % glutaraldehyde and osmic acid for electron microscopy. Results: Under the light microscope, the fibrocollageous tissue was found increased, the capillaries enlarged and the connecting tissue elements increased in the corpus cavernosum in the treated group. On electron microscopy, increased connective tissue, fibroblasts with notched nucleus, shorten immature collagen fibers without striation were seen. Abundant foldings and penetration with collagen bundles were observed in the basal membrane. Large connection complexes, especially gap junctions among the wide capillary endothelial cells were observed. Conclusion: There are evident histological changes due to sildenafil citrate in female rat corpus cavernosum. The clitoris and bartholin glands were the most effected organs. While the histopathological changes of clitoral tissue could be expected, an increase in the mass of bartholin gland was surprised.
  • No Thumbnail Available
    Item
    The maturity of intestinal neomucosa
    Günsar, C; Vatansever, HS; Arslan, OA; Sencan, A; Müftüoglu, S; Özbilgin, K; Kaymaz, F; Mir, E
    Background/Purpose: The maturity of neomucosa growing on a serosal surface for the treatment of short bowel syndrome still is questionable. The aim of this study was to evaluate the intestinal neomucosa to assess its histologic maturity. Methods: A 6-cm-long isolated ileal segment (IS) was prepared in 8 Wistar albino-type rats. The IS was divided from the antimesenteric side, and 2 intestinal tubes were established, which shared a common wall and a common pedicle. After ileal biopsy sampling for the control group (CG), the IS was fashioned into a mucous fistula. Eight weeks later, all the rats were killed, and the ISs were investigated for neomucosal growth. Sections were prepared with periodic acid shift (PAS) and H & E staining for light microscopy. They also were evaluated by transmission electron microscopy. The microscopic morphology of the 2 groups was evaluated. Immunohistochemical staining was performed to show the expression of the tissue beta1, alpha3 and alpha2beta1 integrin subunits of both the neomucosa (NS) and control group (CG) segments. Results: Sections of the NS showed a well-arranged columnar epithelial cell layer with goblet cells that were generally located superficially and with a complete basement membrane. Under the electron microscope, the sections from the NS group showed an epithelial cell layer with proper microvilli of the same height, although they were shorter than those of the CG, and tight intercellular junctions between the epithelial cells. Significant differences between the NS and CG groups were found in the measurements of villus width at base, microvillus surface, and microvillus height. The lamina propria consisted of rich collagen fibers and active fibroblasts in the NS group. In the immunohistochemical staining, although beta1 integrine showed a dense distribution (+++) in the lamina propria, particularly localizing at the depth of the tunica mucosa layer, alpha3 integrin was observed to have a less dense immunoreactivity (++) in both groups. The expression of alpha2beta1 integrin showed slight and dispersed (+) staining. Conclusions: The NS showed histologic maturity and ultimate structural similarity with the native small bowel mucosa, which provides strong indirect evidence for the proper functioning of the neomucosa. (C) 2004 Elsevier Inc. All rights reserved.
  • No Thumbnail Available
    Item
    Histopathological effects of sildenafil citrate on rat corpus cavernosum
    Gümüs, B; Vatansever, HS; Müezzinoglu, T; Müftüoglu, S; Kaymaz, F; Büyüksu, C
    Sildenafil citrate (Viagra) is widely used for the treatment of erectile dysfunction with various etiologies. The aim of the present study was the investigation of histopathotogical effects of sildenafil citrate on, rat corpus cavernosum using light and electron microscopical techniques. Twenty mate rats were divided into two groups. The first group (n = 10) was used as a Control and the second group (n = 10) was treated with sildenafil citrate. Penile tissue was collected, fixed with formalin and embedded in paraffin for light microscopy, or fixed with gluteraldehyde and osmium tetroxide and embedded in Epon for electron microscopy. Light microscopical analysis showed that the corpus cavernosum was elongated and the number of blood vessels was increased. The amount of connective tissue in the penis was increased and dense collagen and smooth muscle fibers were observed in treated rats. electron microscopical analysis showed that stromal. structures of the corpus cavernosum (collagen fibers and number of cellular elements) were increased in treated rats. Fibroblasts showed signs of activation and the number of other stromal cells was increased. Immature newly synthesized collagen fibers were observed and penetrated endothelial basement membranes. In addition, endothelial cells also showed signs of activation such as cytoplasmic granules in treated rats, whereas the surface area of blood vessels was increased and basement membranes were thickened. These histopathological changes due to treatment with sildenafil citrate indicate that prolonged use of sildenafil citrate may increase the risk of fibrosis in the penis. (C) 2003 Elsevier GmbH. All rights reserved.