Person: MERAL, İSMAİL
Now showing 1 - 10 of 59
- PublicationMetadata onlyRaftlin, presepsin levels and thiol-disulfide homeostasis in acute appendicitis: A pilot study(2018-11-01) KOÇYİĞİT, ABDÜRRAHİM; ERSOY, YELİZ EMİNE; SELEK, ŞAHBETTİN; SÜMBÜL, BİLGE; ÖZER, ÖMER FARUK; GÜLER, ERAY METİN; MERAL, İSMAİL; YİĞİT, MEHMET; ÖZER, ÖMER FARUK; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİM; MERAL, İSMAİL; SÜMBÜL, BİLGE; SELEK, ŞAHABETTİN; ERSOY, YELIZ EMINEObjective: To investigate some of the new inflammatory and oxidative stress markers in acute appendicitis.
- PublicationMetadata onlyEffects of Nigella sativa on apoptosis and GABA(A) receptor density in cerebral cortical and hippocampal neurons in pentylenetetrazol induced kindling in rats(2016-01-01) AYDIN, M. S.; USTUNOVA, SAVAŞ; ESREFOGLU, MUKADDES; MERAL, I.; Arifoglu, YASİN; DEMIRTAS, M.; MERAL, İSMAİL; EŞREFOĞLU, MUKADDES; ÜSTÜNOVA, SAVAŞ; ARİFOĞLU, YASİNWe investigated the effects of Nigella sativa on apoptosis and gamma-aminobutyric acid (GABA(A)) receptor density in cerebral cortical and hippocampal neurons in a pentylenetetrazol (PTZ)-induced kindling model in rats. The PTZ kindling model was produced by injecting PTZ in subconvulsive doses to rats on days 1, 3, 5, 8, 10, 12, 15, 17, 19, 22 and 24 of the study into animals of PTZ treated (PTZ) and PTZ + N. sativa treated (PTZ + NS) groups. Clonic and tonic seizures were induced by injecting a convulsive dose of PTZ on day 26 of the study. Rats in the PTZ + NS group were treated also with a 10 mg/kg methanolic extract of N. sativa 2 h before each PTZ injection. Rats in the control group were treated with 4 ml/kg saline. The number of neurons that expressed GABA(A) receptors in the hippocampus and cerebral cortex of rats in the PTZ and PTZ + NS groups increased significantly. There was no significant difference in the number of GABA(A) receptors between the PTZ and PTZ + NS groups. GABA(A) receptor density of the neurons in the cerebral cortex, but not hippocampus, was increased in PTZ group compared to controls. We observed a significant increase in the number of apoptotic neurons in the cerebral cortex of rats of both the PTZ and PTZ + NS groups compared to controls. We observed a significant decrease in the number of the apoptotic neurons in the cerebral cortex of rats in the PTZ + NS group compared to the PTZ group. N. sativa treatment ameliorated the PTZ induced neurodegeneration in the cerebral cortex as reflected by neuronal apoptosis and neuronal GABA(A) receptor frequency.
- PublicationMetadata onlyDownregulatory effect of miR-342-3p on epileptogenesis in the PTZ-kindling model.(2022-10-22T00:00:00Z) Pala, Mukaddes; Meral, İSMAİL; Pala Acikgoz, Nilgun; Gorucu Yilmaz, Senay; Okur, Semra Karaca; Acar, Seyma; Polat, Yalcin; Akbas, Fahri; MERAL, İSMAİL; AKBAŞ, FAHRİ
- PublicationMetadata onlyThe Nutritional Habits and Relationship Between The Antioxidant Activity and Iron Deficiency Anemia During Pregnancy(2022-01-01T00:00:00Z) Güven, Suzan; MERAL, İSMAİL; Kurdoglu, Mertihan; Demir, Halit; MERAL, İSMAİL© 2022, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.The aim of this study was to investigate the changes in nutritional habits, and also relationship among oxidative stress, iron deficiency anemia and some antioxidant enzyme activities during pregnancy. Twenty pregnant women in the first trimester, 20 pregnant women in the last trimester and 20 non-pregnant women (control group) were included in the study. The study groups were similar in terms of age and body mass index. None of the participants had any systemic disease or smoked. After having filled out the questionnaire about nutritional habits, the blood samples were collected, and the malondialdehyde (MDA) level and activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and catalase (CAT) enzymes were measured together with hemoglobin (Hgb), hematocrit (Hct), iron, ferritin and the mean erythrocyte volume (MCV) levels. The most frequent meat consumption was on every other day in controls, but once a week in the first and last trimester groups. In addition, the most frequent egg consumption was on every other day and once a week in contro ls, but rare in the first trimester group, and once a week in the last trimester group. Although iron and vitamin use was 10% and 30% in the first trimester group, it was 50% and 65% respectively in the last trimester group. The MDA level was higher, and t he SOD, CAT and GSH-Px enzyme activities were lower in both pregnant groups than controls. The Hgb and Hct values were lower in the last trimester group compared to the controls and the first trimester group. The first trimester group and the controls were similar in terms of Hgb and Hct levels. There was no significant difference among groups in terms of ferritin, iron or MCV values. It was concluded that; a) the egg and meat consumption might decrease with the progress of pregnancy, b) the oxidative stress increased in pregnancy, c) Hgb and Hct values might be lower in the last trimester group despite increased intake of oral iron and vitamin supplements, and normal serum iron levels due to decreased CAT activity. Therefore, more studies are needed to demonstrate the relationship among oxidative stress, anemia and CAT enzyme activity in pregnancy.
- PublicationOpen AccessAngiotensin IV improves spatial memory in streptozotocin-induced diabetic rats by reducing oxidative stress and altering BDNF levels(2021-01-01T00:00:00Z) KILIÇ, AYSU; ÜSTÜNOVA, SAVAŞ; ELİBOL, BİRSEN; Bulut, Huri; MERAL, İSMAİL; Sahin, Gulderen; KILIÇ, AYSU; ÜSTÜNOVA, SAVAŞ; ELİBOL, BİRSEN; MERAL, İSMAİLIn this study, we investigated the protective effects of angiotensin IV (Mg IV) on cognitive function in streptozotocin (STZ)-induced diabetic rats. Male Wistar albino rats, were randomly divided into four groups; control (C), diabetes (Dia, 60 mg/kg, STZ, i.p.), Mg IV (5 mu g/kg, s.c.) and Dia+Ang W. The passive avoidance and Morris water maze (MWM) tests were used to evaluate learning and memory performance. Behavioral tests were carried out between 21 and 30 days after the initial Ang IV injection. Hippocampi were dissected and retained for biochemical and Western blot analysis. The Dia group exhibited the poorest behavioral results, while the Dia+Ang W group performed highest on the MWM task. Superoxide dismutase, glutathione peroxidase, and malondialdehyde levels increased significantly in the Dia group compared to Dia+Ang IV. Brain-derived neurotrophic factor (BDNF) and N-methyl-D-aspartate levels were significantly elevated, while levels of GABA(A) significantly decreased, in the Dia+Ang IV group compared to the Dia group. These findings suggest that peripheral administration of Ang IV ameliorated spatial memory in diabetic rats by decreasing hippocampal oxidative stress and BDNF levels.
- PublicationOpen AccessEffects of Leontice leontopetalum and Bongardia chrysogonum on oxidative stress and neuroprotection in PTZ kindling epilepsy in rats(2018-12-01) Ergül Erkeç, Özlem; Arihan, Okan; Kara, Mehmet; Karataş, Ersin; Erten, Remzi; Demir, Halit; Mukemre, Muzaffer; Ozgokce, Fevzi; MERAL, İSMAİLWe investigated the effects of Leontice leontopetalum and Bongardia chrysogonum on apoptosis, gamma-aminobutyric acid (GABA(A)) receptor positive cell number. cyclin-B1 and bcl-2 levels and oxidative stress in pentylenetetrazol (PTZ.) kindling in rats. Kindling was produced by subconvulsant doses of PTZ treatments in rats. Wistar albino rats were divided into 4 groups; Control, PTZ treated (PTZ), PTZ ;L. leontopetalum extract treated (PTZ FILE) and PTZ ;B. chrysogonum extract treated (PTZ+BCE) groups. Extracts were given a dose (200 mg/kg) 2h before each PTZ, injection. PTZ treatment significantly decreased the glutathione peroxidase (GSH-Px), superoxide dismutase (SOD) activities and bc1-2 levels and increased the total oxidant status (TOS), malondialdehyde (MDA), cyclin B1, oxidative stress index (OSI) and number of neurons that expressed GABA(A) receptors when compared to the control. LLE and BCE possessed antioxidant activity in the brain and ameliorated PTZ induced oxidative stress, decreased cyclin-B1, increased bcl-2 levels, and kept the GABA(A) receptor number similar to that of the control despite the PTZ application.
- PublicationMetadata onlyNeuroprotective Effect of Thymoquinone through miR-204-3p in 6-Hydroxydopamine-Induced Parkinson Model(2018-04-04) PALA, MUKADDES; ACIKGOZ, nilgun pala; POLAT, yalcin; AKBAŞ, FAHRİ; ERDİM, Meryem Betül; ÜNSAL, Rümeysa; MERAL, İSMAİL; MENGİ, MURAT; AKBAŞ, FAHRİ; MERAL, İSMAİL
- PublicationUnknownEffect of Thymoquinone on Ischemia/Reperfusion Injury in Isolated Hearts of Streptozotocin-Induced Diabetic Rats(2019-12-01T00:00:00Z) ÜSTÜNOVA, SAVAŞ; KILIÇ, Aysu; Bulut, Hun; MERAL, İSMAİL; Alican, Inci; ÜSTÜNOVA, SAVAŞ; KILIÇ, AYSU; MERAL, İSMAİL
- PublicationUnknownThe Neurotrophic Effect of Thymoquinone in Pentilentetrazole-induced Epilepsy Model(2017-09-01) Pala, Mukaddes; Acikgoz, Nilgun Pala; KACMAZ, Sema Karaca; ACAR, Seyma; Meral, Ismail; Akbas, FAHRİ; MERAL, İSMAİL; AKBAŞ, FAHRİ
- PublicationUnknownPentylenetetrazole-induced kindling rat model: miR-182 and miR-27b-3p mediated neuroprotective effect of thymoquinone in the hippocampus(2022-03-01T00:00:00Z) Pala, Mukaddes; MERAL, İSMAİL; Acikgoz, Nilgun Pala; GÖRÜCÜ YILMAZ, ŞENAY; TAŞLIDERE, ELİF; Okur, Sema Karaca; Acar, Seyma; AKBAŞ, FAHRİ; MERAL, İSMAİL; AKBAŞ, FAHRİObjectives: Epilepsy is a neurological disease that pathologically affects brain functions. The epileptic hippocampus has modified microRNA(miRNA) levels. Therefore, we aimed to evaluate the neuroprotective effect of thymoquinone (TQ) in PTZ-induced epilepsy and to demonstrate the overlap between miRNA and mRNA expression profiles. Methods: Male adult Wistar albino rats (200-230 g, n = 20) were divided into three groups as control (n = 6), PTZ (n = 7), and TQ + PTZ (n = 7). The PTZ kindling model was created by injecting PTZ in sub convulsive doses to rats on days 1, 3, 5, 8, 10, 12, 15, 17, 19, 22, and 24 of the study into animals. Clonic and tonic seizures were induced by injecting a convulsive dose of PTZ on day 26 of the study. Rats in the TQ+PTZ group were treated by oral gavage with a 20 mg/kg TQ 2 h before each PTZ injection. The rats in the control group were treated with 0.5 ml saline. Seizure severity was evaluated with the Racine scale. The genes and signaling pathways targeted by miRNAs were determined by bioinformatics analysis. Results: In the rat hippocampus, mature 728 miRNAs were analyzed by microarray and the nine miRNA were verified by quantitative Real-Time PCR. rno-miR-182 and rno-miR-27b-3p were up-regulated in the PTZ group and down-regulated in the TQ + PTZ group. Discussion: In the PTZ kindling epilepsy model, the expression of these two miRNAs was regulated by TQ and exerted a neuroprotective effect by controlling the activities of target genes.