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Öğe The curative effect of cannabinoid 2 receptor agonist on functional failure and disruptive inflammation caused by intestinal ischemia and reperfusion(Wiley, 2020) Bayram, Sait; Parlar, Ali; Arslan, Seyfullah OktayIschemia and reperfusion of intestinal tissue (intestinal I/R) induce disruption of ileal contractility and chain responses of inflammatory. The aim of this study was to reveal whether therapeutic value of cannabinoid 2 (CB2) receptor activity in the intestinal I/R, via to the exogenous administration of CB2 agonist (AM-1241). Intestinal I/R injury were performed through 30-min ischemia and 150-min reperfusion of mesenteric artery in Wistar rats. The pre-administered doses of 0.1, 1, and 5 mg/kg of CB2 agonist were studied to inhibit inflammation of intestinal I/R injury including ileum smooth muscle contractility, polymorphonuclear cell migration, oxidant/antioxidant defense system, and provocative cytokines. Pre-administration with CB2 receptor agonist ensured to consider improving the disrupted contractile responses in ileum smooth muscle along with decreased the formation of MDA that production of lipid peroxidation, reversed the depleted glutathione, inhibited the expression of TNF-alpha and of IL-1 beta in the intestinal I/R of rats. Taken together results of this research, the agonistic activity of CB2 receptor for healing of intestinal I/R injury is ensuring associated with anti-inflammatory mechanisms such as the inhibiting of migration of inflammatory polymorphonuclear cells that origin of acute and initial responses of inflammation, the inhibiting of production of provocative and pro-inflammatory cytokines like TNF-alpha and IL-1 beta, the rebalancing of oxidant/antioxidant redox system disrupted in injury of reperfusion period and the supporting of physiologic defensive systems in endothelial and inducible inflammatory cells.Öğe Evaluation and comparison of alpha- and beta-amanitin toxicity on MCF-7 cell line(2014) Kaya, Ertuğrul; Bayram, Recep; Yaykaşlı, Kürşat Oğuz; Yılmaz, İsmail; Bayram, Sait; Yaykaşlı, Emine; Gepdiremen, Ali AkçahanBackground/aim: Alpha- and beta-amanitins are the main toxins of the poisonous Amanita phalloides mushroom. Although there are many studies available concerning alpha-amanitin, there are limited data about beta-amanitin in the literature. Therefore, this study is aimed at comparing the toxic effects of alpha- and beta-amanitin on the MCF-7 cell line. Materials and methods: The alpha- and beta-amanitins used for this research were purified from Amanita phalloides by preparative high-performance liquid chromatography. The MCF-7 breast cancer cell line was used, and specific concentrations of the toxins (100, 10, 1, 0.1, and 0.01 µg/mL) were applied to the cells. The MTT test was performed to determine the level of toxicity, and the quantity of protein in the cell was measured using the biuret test. Results: The alpha-amanitin showed a higher toxicity at 36 h, while the highest inhibition of protein synthesis by the beta-amanitin was observed at 24 h. Conclusion: It was shown that the beta-amanitin may be responsible for toxicity, like alpha-amanitin, in Amanita phalloides mushroom poisoning. The early inhibition of protein synthesis for beta-amanitin might be useful for future experiments and research.Öğe Evaluation and comparison of alpha- and beta-amanitin toxicity on MCF-7 cell line(Tubitak Scientific & Technical Research Council Turkey, 2014) Kaya, Ertuğrul; Bayram, Recep; Yaykaşlı, Kürşat Oğuz; Yılmaz, İsmail; Bayram, Sait; Yaykaşlı, Emine; Gepdiremen, Ali AkçahanBackground/aim: Alpha- and beta-amanitins are the main toxins of the poisonous Amanita phalloides mushroom. Although there are many studies available concerning alpha-amanitin, there are limited data about beta-amanitin in the literature. Therefore, this study is aimed at comparing the toxic effects of alpha- and beta-amanitin on the MCF-7 cell line. Materials and methods: The alpha- and beta-amanitins used for this research were purified from Amanita phalloides by preparative high-performance liquid chromatography The MCF-7 breast cancer cell line was used, and specific concentrations of the toxins (100, 10, 1, 0.1, and 0.01 mu g/mL) were applied to the cells. The MTT test was performed to determine the level of toxicity, and the quantity of protein in the cell was measured using the biuret test. Results: The alpha-amanitin showed a higher toxicity at 36 h, while the highest inhibition of protein synthesis by the beta-amanitin was observed at 24 h. Conclusion: It was shown that the beta-amanitin may be responsible for toxicity, like alpha-amanitin, in Amanita phalloides mushroom poisoning. The early inhibition of protein synthesis for beta-amanitin might be useful for future experiments and research.Öğe The evaluation and comparison of the alpha and beta amanitin toxicity on MCF-7 cell line(Current Biology Ltd, 2013) Kaya, Ertuğrul; Bayram, Recep; Yaykaşlı, Kürşat Oğuz; Yılmaz, İsmail; Bayram, Sait; Yaykaşlı, Emine; Gepdiremen, Ali Akçahan…Öğe High purity gamma amanitin isolation from Amanita phalloides mushroom(Current Biology Ltd, 2013) Kaya, Ertuğrul; Yılmaz, İsmail; Yaykaşlı, Kürşat Oğuz; Parlar, Ali; Bakırcı, Sinan; Bayram, Sait; Çolakoğlu, Serdar…Öğe Kanabinoidlerin, sıçan ince bağırsak iskemi/reperfüzyon hasarında görülen ileum düz kas fonksiyon bozuklukları üzerinde etkilerinin araştırılması(Düzce Üniversitesi, 2013) Bayram, Sait; Arslan, Seyfullah OktayAmaç: Kanabinoidlerin, sıçan ince bağırsak iskemi/reperfüzyon hasarında görülen ileum düz kas işlevindeki bozukluklar üzerinde etkilerinin araştırılması amaçlandı. Gereç ve Yöntem: Çalışmamız Düzce Üniversitesi Tıp Fakültesi Deney Hayvanları Araştırma ve Yetiştirme Ünitesinden sağlanan sıçanlarda yapıldı. Kanabinoid agonist ve antagonistleri mezenter arterde iskemi/reperfüzyon (30 dk iskemi ve 180 dk reperfuzyon, İ/R) oluşturulan hayvanlara infüzyonla verildi. I/R'a maruz kalan bağırsak kısmından alınan ileumun son kısmı organ banyosuna asıldı. İzole dokunun asılmasının 30 dk sonrasında, preparatlardan elde edilen asetilkolin kasılma-gevşeme cevapları kaydedildi. Ayrıca alınan ileum dokusunda miyeloperoksidaz (MPO) aktivitesi spektrofotometrik olarak ölçüldü. Bulgular: Kanabinoid agonist ön tedavisinin iskemik dokuda ince kas kasılmaları üzerine koruyucu etkili olduğu görüldü. İzole ileum dokularının asetilkoline verdiği cevaplar; 10-7 konsantrasyonda şam ve İR grubu arasında anlamlı fark saptandı (p<0.05), 10-6 konsantrasyonda şam ve İR grubu arasında, İR ve CB2 agonisti arasında, CB2 agonist ve CB2 agonist+antagonist arasında; 10-5 konsantrasyonda şam ve İR grubu, İR ve CB2 agonisti, CB2 agonist ve CB2 agonist+antagonist arasında; 10-4 konsantrasyonda şam ve İR grubu, İR ve CB2 agonisti arasında anlamlı fark saptandı (p<0.001). İnce bağırsakta oluşan İ/R hasarını göstermek için araştırdığımız diğer bir biyokimyasal parametre intestinal MPO enzim aktivitesiydi. Şam ve İ/R MPO değerleri arasında anlamlı farklılık görüldü (P<0.01). İ/R ve İ/R+CB2 agonist MPO değerleri arasında anlamlı farklılık görüldü (P<0.05). İ/R+CB2 agonist ve İ/R+CB2 agonist+antagonist, İ/R+CB2 agonist ve İ/R+DMSO MPO değerleri arasında anlamlı farklılık çıkması gerekirken görülmedi (P>0.05). Sonuç: Deneysel İ/R modelinde kanabinoid agonistinin (AM-1241), antiinflamatuar etki gösterdiği ve bu suretle kanabinoiderjik agonistlerin başta ileum dokusu olmak üzere vücut dokularının İ/R hasarını önleyebileceği düşünülmektedir.Öğe Purification and in vitro toxicity of gamma amanitin(Taylor & Francis Ltd, 2015) Bakırcı, Sinan; Bayram, Recep; Yılmaz, İsmail; Yaykaşlı, Kürşat Oğuz; Bayram, Sait; Kaya, ErtuğrulWe aimed to obtain gamma amanitin with high purity through a purification process and compare toxic effects of alpha, beta, and gamma amanitin. Specific concentrations of the toxins (25, 10, 1, and 0.1 mu g/mL) were applied to the C3A human hepatocytes. A MTT test was performed to determine the level of toxicity. Alpha amanitin showed a higher toxicity in 48 h while the lowest toxicity was observed in beta amanitin. The toxicity level of gamma amanitin was found between the alpha and beta amanitin toxicity. Our method is suitable for obtaining gamma amanitin with high purity (>99%) as well as for obtaining alpha amanitin and beta amanitin. Gamma amanitin has been shown to have equal responsibility for toxicity as alpha amanitin in amanita poisoning.
