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    The Effect of the iNOS Inhibitor S-Methylisothiourea and Hyperbaric Oxygen Treatment on Radiation Colitis in Rats
    (UNIV CATHOLIQUE LOUVAIN-UCL, 2016) Demirci, Hakan; Polat, Zulfikar; Uygun, Ahmet; Kadayifci, Abdurrahman; Sager, Omer; Ozturk, Kadir; Kantarcioglu, Murat; Sahiner, Fatih; Caliskan, Bahadir; Karslioglu, Yildirim; Ozler, Mehmet; Ozel, Melih; Ergun, Hakki; Ozturk, Ozlem; Beyzadeoglu, Murat; Bagci, Sait
    Introduction : External radiotherapy is one of the main treatment modalities for a variety of malignancies. However, the lower gastrointestinal tract is sensitive to the ionizing radiation. Hyperbaric oxygen treatment (HOT) has been suggested as a viable treatment for refractory radiation colitis, but the effect of S-Methylisothiourea (SMT) in the radiation colitis have not reported. Aim : To investigate the effect of SMT, HOT and the combination of both in an acute radiation-induced enterocolitis model. Methods : Sixty Sprague-Dawley rats were divided randomly into five equal groups. A single dose of gamma irradiation (25 Gy) was administered through the colorectal region to anesthetized rats. In the control group, we applied 2 ml of saline solution intraperitoneally for five days. In the HOT group, 100-per-cent oxygen at 2.5 atm pressure was applied for five days. In the SMT group, 10 mg/kg/day of SMT was applied intraperitoneally for five days. In the HOT+SMT group, HOT and SMT were both applied in the same dosages as in the preceding two groups. At the end of five days, the rats were sacrificed and colon samples were collected for histological grading. Blood samples were collected to test for : tumor necrosis factor-alpha (TNF-alpha), interleukin-10 (IL-10), IL-1 beta, transforming growth factor-beta (TGF-beta) and intercellular adhesion molecule-1 (ICAM-1) mRNA. Results : The TNF-alpha, IL-1 beta, IL-10 and TGF-beta levels were reduced by SMT, HOT and HOT+SMT applications (p < 0.05). However ICAM-1 mRNA levels were not significantly lower (p:0.19). The microscopic scores differed significantly between the SMT, HOT and HOT+ SMT groups and the control group. There was significant improvement histologically, especially in the HOT+ SMT group. When we compared the weight of the rats before and after the study, weight loss was significantly lower in the SMT, HOT and HOT+ SMT groups compared with the control group (p < 0.05). Conclusions : HOT and SMT together were significantly more effective in preventing weight loss and in reducing inflammation and the severity of colitis histology when compared with HOT and SMT separately.
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    Efficacy of a Modified Sequential Therapy Including Bismuth Subcitrate as First-Line Therapy to Eradicate Helicobacter pylori in a Turkish Population
    (WILEY-BLACKWELL, 2012) Uygun, Ahmet; Ozel, A. Melih; Sivri, Bulent; Polat, Zulfikar; Genc, Halil; Sakin, Yusuf Serdar; Celebi, Gurkan; Uygur-Bayramicli, Oya; Ercin, Cemal Nuri; Kadayifci, Abdurrahman; Emer, Ozdes; Gunal, Armagan; Bagci, Sait
    Background Eradication rates of Helicobacter pylori with standard triple therapy are not satisfactory. Sequential therapy is an alternative method to overcome this problem. Objectives The aim of this study was to assess efficacy of a modified sequential therapy with the addition of a bismuth preparation, as first-line treatment in the eradication of H. pylori infection. Materials and Methods One hundred and forty-two H. pylori-positive patients were included in the study. Patients were given a 14-day sequential therapy program consisting of pantoprazole, 40 mg (b.i.d. for 14 days); colloidal bismuth subcitrate, 300 mg 4 (two tablets before breakfast and dinner, for 14 days); amoxicillin, 1 g (b.i.d.for the first 7 days); tetracycline, 500 mg (q.i.d. for the second 7 days); and metronidazole, 500 mg (t.i.d. for the second 7 days). Eradication was tested by urea breath test (UBT) 6 weeks after completion of treatment. Results Of the 142 patients included, 131 completed the study. Per-protocol and intention-to-treat analyses revealed high eradication rates in this group (92.095% CI, 87.296.8%, and 81.095% CI, 74.587.4%, respectively). There was no relation to sex and age with this modified sequential therapy. Compliance was satisfactory (11 patients four women and seven men were unavailable for follow-up), and side effects were minimal (six patients had to stop treatment metronidazole-related facial swelling and numbness on the face and hands in two patients; tetracycline-related fever and epigastric pain and nausea and vomiting in two patients; and amoxicillin-related diarrhea and vaginal discharge in two patients). These side effects were reversible and resolved after the cessation of the related medication. Conclusions This 14-day modified sequential treatment, including bismuth, achieves a significantly high eradication rates in patients with H. pylori infection, with five satisfactory patient compliance and minor side effects.