Yazar "Yuksel, Meral" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Antioxidant and neuroprotective effects of dexpanthenol in rats induced with traumatic brain injury
    (Elsevier Sci Ltd, 2023) Bektasoglu, Pinar Kuru; Koyuncuoglu, Turkan; Ozaydin, Dilan; Kandemir, Cansu; Akakin, Dilek; Yuksel, Meral; Gurer, Bora
    Trauma-induced primary damage is followed by secondary damage, exacerbating traumatic brain injury (TBI). Dexpanthenol has been shown to protect tissues against oxidative damage in various inflammation models. This study aimed to investigate possible antioxidant and neuroprotective effects of dexpanthenol in TBI. Wistar albino male rats were randomly assigned to control ( n = 16), trauma ( n = 16) and dexpan-thenol (500 mg/kg; n = 14) groups. TBI was induced under anesthesia by dropping a 300 g weight from 70-cm height onto the skulls of the rats. Twenty-four hours after the trauma, the rats were decapitated and myeloperoxidase (MPO) levels, luminol-and lucigenin-enhanced chemiluminescence (CL), malondi-aldehyde (MDA) levels, superoxide dismutase (SOD) levels, and catalase (CAT) and caspase-3 activities were measured in brain tissues. Following transcardiac paraformaldehyde perfusion, histopathological damage was graded on hematoxylin-eosin-stained brain tissues. In the trauma group, MPO level, caspase-3 activity and luminol-lucigenin CL levels were elevated ( p < 0.05-0.001) when compared to controls; meanwhile in the dexpanthenol group these increases were not seen ( p < 0.05-0.001) and MDA levels were decreased ( p < 0.05). Decreased SOD and CAT activities ( p < 0.01) in the vehicle-treated TBI group were increased above control levels in the dexpanthenol group ( p < 0.05-0.001). in the dexpanthenol group there was relatively less neuronal damage observed micro-scopically in the cortices after TBI. Dexpanthenol reduced oxidative damage, suppressed apoptosis by stimulating antioxidant systems and alleviated brain damage caused by TBI. Further experimental and clinical investigations are needed to confirm that dexpanthenol can be administered in the early stages of TBI. (c) 2023 Elsevier Ltd. All rights reserved.
  • Küçük Resim Yok
    Öğe
    The relationship between vitamin C and oxidative status in periodontitis: A case-control study
    (Bayrakol Medical Publisher, 2023) Emiroglu, Elif; Cakir, Tulin; Yuksel, Meral; Gunes, Fatma Esra; Cekici, Ali; Karakoyun, Berna
    Aim: A co-factor for reactions including collagen hydroxylation, vitamin C prevents oxidative damage to DNA and proteins and may be associated with oxidative stress in periodontitis. This study was designed to test the hypothesis that vitamin C is inversely related to oxidative stress markers in individuals with periodontitis.Material and Methods: This study was conducted with 25 individuals with periodontitis and 24 individuals without periodontitis. Vitamin C intake of participants was determined using a valid food frequency questionnaire, and plasma ascorbic acid levels of participants were measured using high-performance liquid chromatography. Total antioxidant status and total oxidant status were measured in serum and saliva samples, and the oxidative stress index was calculated. Lucigenin-enhanced chemiluminescence assays determined superoxide radicals in saliva.Results: Vitamin C intake in patients with periodontitis was found to be lower than in the control group (124.68 mg/d and 176.71 mg/d, p=0.003, respectively). The plasma ascorbic acid levels and total oxidant status (p=0.03,r=-0.42) and superoxide radical levels (p=0.01,r=-0.53) were inversely correlated in patients with periodontitis.Discussion: Dietary vitamin C intake in patients with periodontitis was lower than in healthy individuals; vitamin C intake may be inversely related to oxidative stress which is the underlying cause of periodontitis.