Yazar "Kocyigit, Abdurrahim" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    Berberine Attenuates Cerebral Vasospasm After Experimental Subarachnoid Hemorrhage Via Modulating AMPK/Rho Pathway
    (Dokuz Eylul Univ Inst Health Sciences, 2020) Kadirhan, Ozge Altintas; Kumas, Meltem; Karatas, Ersin; Mutlu, Hasan Serdar; Kocyigit, Abdurrahim; Asil, Talip
    Purpose: Our goal is to clarify the effectiveness of berberine (BBR) on cerebral vasospasm induced by subarachnoid hemorrhage. Methods: Thirty male Sprague-Dawley rats (350-400 g) were randomly allocated to five groups (sham group, SAH, BBR, SAH+BBR1 or SAH+BBR2. Experimental SAH model was induced by applying autologous blood into the cisterna magna at interval of 48 hours. To evaluate early and late effects of BBR, we allocated BBR treated groups as SAH+BBR1 and SAH+BBR2 (respectively, received BBR at a dose of 20 mg/kg 15 minutes and 6 hours after first SAH induction). Rats were sacrificed on 72-hour after the study onset. Cross-sections of basilar artery was investigated by histologically. Total antioxidant status (TAS) and total oxidant status (TOS) of brain tissue were studied by spectrophotometric assay. Oxidative stress index (OSI) was calculated. NAPPH Oxidase 4 (NOX4) enzyme levels were measured by ELISA method. Endothelial nitric oxide synthase (e-NOS), phosphorylated e-NOS (pe-NOS), AMP-activated protein kinase (AMPK), phosphorylated AMPK (pAMPK), Rho kinase and cingulin protein expressions were detected by Western blot analysis. Results: SAH+BBR1 and SAH+BBR2 groups significantly demonstrated lower OSI values, increased basilar artery cross-sectional luminal area in comparison with the SAH group. Increased Phosho-eNOS, eNOS, P-AMPK levels and Cingulin expression, decreased Nox4 and Rho-kinase levels were shown in BRB treated SAH groups relative to the SAH group. Conclusion: Berberine might be a neuroprotective agent to improve impaired cerebrovascular spasm.
  • Küçük Resim Yok
    Öğe
    Effectiveness of Different Surgical Flap Delay Methods and Their Systemic Toxicities
    (Lippincott Williams & Wilkins, 2021) Yildiz, Kemalettin; Mirapoglu, Semih Lutfi; Kilic, Ulkan; Guneren, Ethem; Kocyigit, Abdurrahim; Kirazoglu, Ahmet; Sagir, Haci Omer
    Objective: The surgical flap delaying has been shown to be effective in preventing partial flap loss or in preparing larger flaps. However, there is no gold standard flap delay method in the literature. In this study, the authors aimed to compare 3 types of surgical delay methods to determine which model would increase more flap survival. The authors also investigated the effect of delay methods on circulating mononuclear leukocytes as a parameter of DNA damage. Methods: Twenty-four Sprague-Dawley male rats were divided into 4 groups. All subjects had a 10 x 3 cm modified McFarlane flap. Surface area measurements, biopsies, and blood samples were taken on the day of sacrification; 7th day for the control group and 14th day for delay groups. Results: Between incisional surgery delay groups, a significant difference was found in necrosis and apoptosis in the bipedicled group, and only necrosis in the tripedicled group compared to the control. In terms of DNA damage, it was found higher in all experimental groups than in the control group. Conclusions: Both incisional surgical delay procedures' results were meaningfully effective when only incisions were made without the elevation of flaps. In conclusion, bipedicled incisional surgical delay seems to be the most effective method in McFarlane experimental flap model whereas two-staged surgeries may increase the risk of systemic toxicity.
  • Küçük Resim Yok
    Öğe
    Effects of Platelet Rich Plasma and Amniotic Cell Culture Medium on Wound Healing Following Experimental Animal Tracheal Injury Model: A Comparative Study
    (Lippincott Williams & Wilkins, 2021) Mirapoglu, Semih L.; Guler, Eray M.; Tok, Olgu E.; Aydogdu, Ibrahim; Cay, Ali; Camli, Mehmet F.; Kocyigit, Abdurrahim
    Introduction: Prolonged inflammation after tracheal injury invariably results in a degree of stenosis. The topical application of platelet-rich plasma (PRP) and human amniotic fluid-derived cell culture medium (ACCM) have been shown to promote wound healing. The effects of PRP and amniotic cell culture medium (Gibco AmnioMAX - II ) were investigated in a rat model through morphometric, histological, and biochemical parameters. Material & Methods: Thirty-two male Sprague Dawley rats were included in the study: 4 rats provided for the preparation of PRP. Three groups of 7 rats were divided into PRP and ACCM groups, a control and a sham group respectively. A transverse incision on the ventral aspect of the third trachea spanning half of the tracheal circumference was performed. The incision was repaired with 7/0 polypropylene in the sham group. In the control group, 0.5 ml saline solution was applied on to the repaired injury site. In the other two groups, 0.5 mL PRP or ACCM were applied topically on the tracheal repair. Tissue samples were harvested 30 days after surgery for morphometric measurements and biochemical analyses for oxidative stress markers, IL-1beta, IL-6, and VEGF. Connective tissue thickness was evaluated histologically. Statistical analysis included the Mann-Whitney U and Kruskal Wallis tests. Results: A notable difference was detected (P = 0,025) in cartilage segment length measurements of the trachea between the ACCM group and the sham and control groups (P < 0.03). A significant difference was found in the analysis of TAS, TOS, and OSI values between the study groups and the control and sham groups (P < 0.005). There were also differences in IL1-beta and IL-6 levels between ACCM and PRP groups (P < 0.05). For the same parameters, the differences were significant between the PRP and, sham and control groups (P = 0,004 and P = 0,002 respectively), and between the ACCM and, sham and control groups (P = 0,003 and P = 0,002 respectively). VEGF values demonstrated a significant difference between the PRP and sham group (P = 0,002), and between ACCM and sham/control groups (p=0,002 for both), the highest VEGF value was in ACCM group while the lowest value was in the sham group. In the histological assessment of connective tissue, a significant difference was observed between ACCM and the other groups. Conclusion: Amniotic fluid-derived cell culture medium shows less oxidative stress status than the other applications. ACCM is more effective on inflammatory and angiogenetic processes. Connective tissue thickness results were consistent with those biochemical and morphologic results. Additionally, a significant difference was observed in histological data between ACCM and PRP. Overall, ACCM proved to be efficient on tracheal healing. These effects can be attributed to the abundance of growth factors in both PRP and amniotic fluid-derived cell culture medium (ACCM).