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    Hepatoprotective and neuroprotective effect of taxifolin on hepatic encephalopathy in rats
    (Springer/Plenum Publishers, 2022) Okkay, Ufuk; Okkay, Irmak Ferah; Cicek, Betul; Aydin, Ismail Cagri; Ozkaraca, Mustafa
    This study was planned to assess the potential protective effects of taxifolin against thioacetamide-induced hepatic encephalopathy and subsequently to portray its behavioural results. The experimental model was induced with three doses of (200 mg/kg i.p.) thioacetamide and taxifolin (50 and 100 mg/kg, p.o.) was administered for fourteen days. Taxifolin effectively attenuated hepatic encephalopathy through decrease in AST, ALT, ALP and LDH concentrations and improvement of hyperammonemia, and increase in antioxidant capacity by decreasing MDA, ROS, and increasing CAT and GSH. In addition, the expressions of NF-kappa B, TNF-alpha, IL-1 beta, caspase-3 and Bax was down-regulated while IL-10 and Bcl-2 expressions were up-regulated with taxifolin treatment. The recovery was confirmed by downregulation of iNOS and 8-OHdG expressions in our immunohistochemical analysis. Taxifolin treatment reduced the disrupting role of thioacetamide as seen by corrected hyperammonemia as well as preservation of astrocyte and hepatocyte structure. Elevated plus maze and locomotor activity tests also proved that taxifolin might repeal the neurobehavioral disabilities. In conclusion, taxifolin has shown hepatoprotective and neuroprotective roles with antioxidant and anti-inflammatory effects, as well as suppressing the excessive release of ammonia, and it eventually reversed neurobehavioral impairments.
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    In Vivo Evidence for the Preventive Role of Vaccinium macrocarpon Aiton in Indomethacin-Induced Gastric Ulcer: Focusing on Antioxidant, Anti-Inflammatory and Anti-Apoptotic Mechanisms
    (Wiley, 2025) Aydin, Ismail Cagri; Ferah Okkay, Irmak; Okkay, Ufuk; Ozkaraca, Mustafa; Yesilyurt, Fatma; Yilmaz, Aysegul; Cicek, Betul
    The present study aimed to unveil the gastroprotective potential of Vaccinium macrocarpon (VM) extract and its mechanism of action against indomethacin (INDO)-induced gastric ulcers in rats. To achieve this goal, rats were pretreated with either omeprazole (20 mg/kg) or VM (100 mg/kg) orally for 14 consecutive days. Gastric tissue samples were collected and various parameters were evaluated to understand the mechanism of VM's action, including the levels of superoxide dismutase, malondialdehyde, glutathione, CAT and transforming growth factor beta (TGF-beta), as well as the mRNA expression levels of tumour necrosis factor alpha, interleukin 1 beta, nuclear factor kappa B (NF-kappa B) and inhibitor kappa B (I kappa B). Additionally, the immunopositivity of cyclooxygenase (COX)-1, COX-2, PGE2, proliferating cell nuclear antigen (PCNA) and caspase-3 was assessed. The total amount of phenolic compounds present in the VM extract was high (58.08 mu g/mL gallic acid equivalent/mg extract). The healing effect of VM was demonstrated by an increase in the expression of PCNA. Furthermore, the level of TGF-beta was found to increase upon treatment with VM. Analyses of COX-1, COX-2 and PGE2 expression in gastric tissue confirmed the gastroprotective effect of VM. Notably, the expression of NF-kappa B was markedly reduced, whereas that of I kappa B was substantially increased. Overall, the findings of this study demonstrate that VM extract has gastroprotective and curative effects against INDO-induced ulcers through its antioxidant, anti-inflammatory, mucosal regenerative and anti-apoptotic activities. Therefore, VM may serve as a useful adjuvant treatment for nonsteroidal anti-inflammatory drugs-induced gastric ulcer disease.