Yazar "Akkoyun, H. Turan" seçeneğine göre listele

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    Assessment of the effect of sodium tetraborate on oxidative stress, inflammation, and apoptosis in lead-induced nephrotoxicity
    (Taylor & Francis Ltd, 2024) Yaman, Turan; Akkoyun, H. Turan; Akkoyun, Mahire Bayramoglu; Karagozoglu, Fatma; Melek, Sule; Keles, Omer Faruk; Bengu, Aydin Sukru
    Exposure to Pb, a toxic heavy metal, is a risk factor for renal damage. Borax, an essential trace element in cellular metabolism, is a naturally occurring compound found in many foods. This study investigated the effects of sodium tetraborate (ST), a source of borax, on renal oxidative stress and inflammation in rats exposed to Pb. Wistar Albino rats (n = 24) were divided into four groups: Control (0.5 mL, i.p. isotonic), Pb (50 mg/kg/day/i.p.), ST (4.0 mg/kg/day/oral), and Pb + ST groups. At the end of the five-day experimental period, kidney tissue samples were obtained and analyzed. Histopathologically, the Pb-induced damage observed in the Pb group improved in the Pb + ST group. Immunohistochemically, Pb administration increased the expression of inducible nitric oxide synthase, cyclooxygenase-2, and caspase-3. When evaluated biochemically, Pb application inhibited catalase and glutathione peroxidase (GSH-Px) enzyme activities and activated superoxide dismutase enzyme activity. An increase in malondialdehyde levels was considered an indicator of damage. ST application increases glutathione peroxidase enzyme activity and decreased malondialdehyde levels. These results indicate that ST might play a protective role against Pb-induced renal damage via the upregulation of renal tissue antioxidants and cyclooxygenase-2, inducible nitric oxide synthase, and caspase-3 immunoexpression.
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    Behavior, antioxidant, and metabolomics effects of Allium tuncelianum
    (Wiley, 2024) Abbak, Nigar; Nemutlu, Emirhan; Recber, Tuba; Gul, Asli San Dagli; Akkoyun, H. Turan; Akkoyun, Mahire Bayramoglu; Yilmaz, Gulderen
    Allium species are consumed extensively as folkloric medicine and dietary elements, but limited studies have been conducted on them. In this study, the effects of an ethanol-water extract obtained from the underground bulb of Allium tuncelianum (Kollmann) ozhatay, B. Mathew & Siraneci (AT) on the behavioral, antioxidant, and metabolite parameters in rats were evaluated. AT was administered orally once a day at doses of 100 and 400 mg/kg to male Wistar albino rats for 10 consecutive days. The elevated plus maze, rotarod, and hotplate tests were used to examine anxiety-like behaviors, locomotor activities, and pain perception in the rats, respectively. Additionally, untargeted metabolomic analyses were performed on plasma samples and AT extracts using two orthogonal analytical platforms. The phenolic components, mainly fumaric acid, malic acid, vanillic acid, quercetin-3-arabinoside, hydrocinnamic acid, and gallocatechin, were determined in the extract. In addition, arbutin, salicylic acid, trehalose, and nicotinic acid were analyzed in the extract for the first time. The AT extract did not decrease the catalase, glutathione peroxidase, or superoxide dismutase levels; however, diazepam decreased some of those parameters significantly in the brain, liver, and kidney. Although both the AT and diazepam treatments resulted in an increase in anxiolytic-like effects compared to the control group, no significant differences were observed (p > .05). In the metabolomic analysis, significant changes were observed in the rats treated with AT and diazepam, and they caused significant changes in some metabolic pathways, including amino acid and fatty acid metabolism, compared to the control.
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    Determination of trace element and fatty acid levels in tissues of mirror and scaly carp (Cyprinus carpio L., 1758) living in Keban Dam Reservoir (Elazig)
    (Wiley, 2022) Aydin, Sevinc; Akkoyun, H. Turan; Akkoyun, Mahire Bayramoglu; Bengu, Aydin S.; Ekin, Suat; Harlioglu, Ayse G.
    This study investigated the concentrations of some accumulated trace metals (iron, manganese, zinc and copper) and fatty acids in liver and muscle tissues of mirror and scaly carp varieties (Cyprinus carpio L., 1758) living in Keban Dam Reservoir (Elazig), which is the second-largest artificial lake in Turkey that hosts commercially valuable and preferred fish varieties for human consumption. The inductively coupled plasma mass spectrometry (ICP-MS) method was used to analyse the concentrations of trace elements. Fatty acid levels were measured in a gas chromatography mass spectrometry (GC-MS) device, using a flame ionization detector (FID). Considering the two fish varieties and tissues that were studied, the mean metal concentrations (mu g g(-1)) were found in the following ranges: Fe 12.32-49.97, Mn 0.12-0.62, Zn 10.45-86.59 and Cu 2.74-11.86. Although the lowest levels were detected in the muscle tissue for all the metals examined, the levels in the liver tissue were significantly higher. According to the results of the analyses on fatty acid concentrations, the mean total saturated fatty acid levels in the muscle tissue of the scaly carp and mirror carp varieties were found to be 31.07 and 31.43 (%), respectively, whereas these values for the liver tissue were consecutively 22.36 and 22.08 (%). Successively, the mean total levels of unsaturated fatty acids were determined as 68.93 and 68.40 (%) in the muscle tissue and 77.64 and 77.92 in the liver tissue. This study, with the finding that the trace (metallic) element accumulation rates were below the upper limits of the tolerable range, and the examined fish varieties were rich in fatty acids, shows that mirror carp and scaly carp living in Keban Dam Reservoir are highly nutritious for human diets.
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    Effect of Bee Bread (Perga) on Histopathological Changes and Immunohistochemical Expression of Apoptosis Markers in the Kidney of Rats Exposed to Cadmium
    (2024) Yaman, Turan; Akkoyun, H. Turan; Keleş, Ömer Faruk; Akkoyun, Mahire Bayramoğlu
    Cadmium (Cd) is an environmental and industrial pollutant that causes toxicity in various organs in humans and animals. Bee bread (perga) is a natural flavonoid with a wide range of pharmacological properties. This study was conducted to examine the effects of perga on Cd-induced nephrotoxicity. Thirty-two male Wistar rats were randomly divided into 4 groups, as the Control group, Cd group (5 mg/kg/day, orally), Perga group (0.5 g/kg/day, orally), and Cd + Perga group. At the end of the 28-day experiment, kidney tissue samples were taken and histopathological, immunohistochemical, and biochemical analyses were performed. Histopathologically, severe tubular and glomerular damage occurred as a result of Cd exposure in the Cd group. Immunohistochemically, there was an increase in caspas-3 and Bax expression in the renal tissue in the Cd group. According to the biochemical results, while the catalase, superoxide dismutase, and glutathione peroxidase antioxidant enzyme levels decreased in the Cd group, and the malondialdehyde levels increased. However, most of the above-mentioned Cd-induced changes were attenuated by treatment with perga in the Perga + Cd group. In conclusion, perga supplementation may alleviate Cd-induced renal injury through inhibition of apoptosis in renal tissue.
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    EFFECT OF CARBON TETRACHLORIDE (CCI4) AND ELLAGIC ACID ON RAT ERYTHROCYTE G6PD, 6PGD, GR, GST AND TrxR ENZYME ACTIVITIES
    (Parlar Scientific Publications (P S P), 2019) Akkoyun, Mahire Bayramoglu; Akkoyun, H. Turan
    In presented study, in vivo effects of the important polyphenol ellagic acid and CCl4 compound known for its toxic effects on metabolic activity levels of some rat erythrocyte enzymes such as G6PD (glucose 6-phosphate dehydrogenase), 6PGD (6-phosphogluconate dehydrogenase), GR (Glutathione reductase), TrxR (Thioredoxin reductase) and GST (Glutathione S-transferase) were investigated. G6PD enzyme activity meaning rised in CCl4 group and ellagic acid+CCI4 group compared to the control group (p<0.001). 6PGD enzyme activity decreased in CCl4 applyed group compared to control group (p<0.05). The enzyme activity level increased in ellagic acid (p<0.05) and CCl4+ellagic acid (p<0.01) applied groups. An increase was observed in ellagic acid (p<0.001) and CCl4+ellagic acid (p<0.001) applied groups compared to CCl4 administered group. GST enzyme activity reduced in CCI4 applied group compared to control group (p<0.01). GR enzyme activity decreased significantly in CCl4 and ellagic acid groups compared to control group (p<0.05 and p<0.01). TrxR enzyme activity decreased in CCl4 group and ellagic acid administered group compared to control group (p<0.001). A decrease in CCI4+ellagic acid group compared to control was also observed (p<0,001).
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    EFFECT OF QUERCETIN ON SELECTED MICRO ELEMENTS IN RAT LIVER TISSUE DURING CARBON TETRACHLORIDE EXPOSURE
    (Parlar Scientific Publications (P S P), 2019) Akkoyun, H. Turan; Akkoyun, Mahire Bayramoglu
    The aim of this study was to investigate the effects of carbon tetrachloride and quercetin on selected trace element levels such as Cr (Chromium), Mn (Manganese), Fe (Iron), Cu (Copper) in rats. In the study, 28 male Wistar albino rats (200 +/- 300 g) were used. Rats were divided into 4 groups as Control, CCl4 (carbon tetrachloride), Qu (quercetin), Qu + CCl4 (quercetin + carbon tetrachloride) (n=7 in each group). When Cr (mu g/g) amount was examined an increase was observed in Qu administered group (p <0.01) compared to the control. It was increased in Qu (p <0,05) and CCl4 + Qu (p <0,001) treated groups compared to CCl4 group. Mn decreased in CCl4 and CCl4 + Qu groups compared to control. Fe (mu g/g) content was increased in CCl4, CCl4 + Qu and Qu (p<0.01) groups compared to Control. An increase in Qu treated group compared to CCl4 applied group (p<0.05) was observed. The CCl4 + Qu group decreased compared to the Qu group (p<0.01). Cu content of CCl4 and Qu groups showed an increase whereas CCl4 + Qu applied showed a decrease compared to control. As a result; It is thought that quercetin may have an effect on important trace element levels such as Cr (Chromium) Mn (Manganese), Fe (Iron), Cu (Copper) in the case of oxidative stress caused by carbon tetrachloride.
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    Effects of Arbutin on Fatty Acid Levels of Erythrocyte and Serum in Wistar Albino Rats Treated with Potassium Bromate
    (Assoc Pharmaceutical Teachers India, 2022) Akkoyun, H. Turan; Aydin, Sevinc; Akkoyun, Mahire Bayramoglu; Bengu, Aydin Sukru; Ekin, Suat; Erdem, Sinem Aslan
    Background: In the presented study; the Effects of Arbutin (ARB) on the Rat Erythrocyte and serum fatty acid profile which is exposed to potassium bromate (KBrO3) were investigated. Materials and Methods: In this study, 32 Wistar albino rats weighing 250-300 g were used divided into 4 groups. Groups 1: control, group 2: KBrO3 (single dose 100 mg / kg gavage), group 3: ARB (50 mg / kg / day (ip) for 5 days), group 4: KBrO3 + ARB. At the end of the 5(th) day, alteration of fatty acid profile in erythrocyte and serum of rats in all groups was examined. Results: Rat serum essential fatty acid; palmitic acid (C16:0), myristic acid (C14:0), stearic acid (C18:0), oleic acid (C18:1), linoleic acid (C18:2), erythrocyte major fatty acids; palmitic acid (C16:0), myristic acid (C14:0), stearic acid (C18:0), oleic acid (C18:1), linoleic acid (C18:2), arachidic acid (C20:0), eicosenoic acid (C20:1), and lignoceric acid (C24:0). In addition, in our studied serum and erythrocytes; Total monounsaturated fatty acids (MUFA) varied between 8.91 +/- 0.53- 11.71 +/- 2.55 and 33.71 +/- 2.12- 37.11 +/- 2.12, respectively. It was determined that total polyunsaturated fatty acids (PUFA) varied between 5.90 +/- 1.29- 9.96 +/- 1.18 and 14.72 +/- 3.66- 22.13 +/- 4.82, respectively. Conclusion: In our study, alterations in fatty acid contents were observed, and results suggesting that arbutine affects the enzymes involved in Fatty acid metabolism and has an effect on fatty acid amounts.
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    Immunoexpression of CD34, CD68 and CD3 in Cadmium-Induced Liver Damage and Protective Effectiveness of Bee Bread (Perga)
    (2024) Yaman, Turan; Akkoyun, H. Turan; Keleş, Ömer Faruk; Akkoyun, Mahire Bayramoğlu
    Cadmium (Cd) is one of the potent environmental toxicants that causes oxidative stress in many organs of the body, including the liver. Perga (bee bread) is used for apitherapeutic purposes due to its medicinal properties. This study was conducted to investigate the effectiveness of perga on endothelial damage and inflammatory cell activation in the liver as a result of exposure to Cd. For this purpose, 32 male Wistar rats (8 rats/group) were randomly divided into 4 groups, as the control, perga (0.5 g/kg of perga), Cd (5 mg/kg of CdCl2), and Cd + perga (0.5 g/kg of perga + 5 mg/kg of CdCl2) groups. Daily intragastric Cd and/or perga was administered for 4 weeks. At the end of the study, the rats were euthanized and liver tissue sections were taken and stained with hematoxylin-eosin and Masson’s Trichrome. Immunohistochemically, the reactivity of the liver sinusoidal endothelium was determined using CD34, the reactivity of the Kupffer cells was determined using CD68, and the levels of T-lymphocyte cells were determined using CD3 antibodies. Exposure to Cd caused significant histological changes in the liver. Immunohistochemically, exposure to Cd caused an increase in the expressions of CD34, CD68, and CD3. On the other hand, the cotreatment of Cd and perga caused partial improvement in some histopathological changes. Compared to the Cd group, there was a decrease in CD34 and CD68 positivity in the Cd + perga group, while no significant difference was detected in the number of CD3-positive cells between the groups. The results revealed that the histopathological changes and inflammation in the rat liver could partially improve with perga supplementation.
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    In Vivo and in Vitro Regulatory Effect of Silibinin on Some Metabolic Enzyme Activities against Cobalt Induced Toxicity in Rats: A Biochemical Approach
    (Amer Chemical Soc, 2023) Temel, Yusuf; Akkoyun, H. Turan; Akkoyun, Mahire Bayramoglu; Karagozoglu, Fatma; Melek, Sule; Bengu, A. Sukru; Erdem, Sinem Aslan
    The study aimed to examine the in vivo inhibition effect of cobalt ion and silibinin on metabolic enzymes such as glucose-6-phosphate dehydrogenase (G6PD), 6-phosphogluconate dehydrogenase (6PGD), glutathione reductase (GR), and glutathione S-transferase (GST) and their in vitro inhibition effect on 6PGD. Twenty-four Wistar Albino rats weighing approximately 250-300 g were used in the study. The rats were divided into 4 groups as group 1 (control): isotonic serum (0.5 mL i.p), group 2 (cobalt): (150 mg kg/day cobalt), group 3 (silibinin): (100 mg/kg/day silibinin), group 4 (cobalt + silibinin). As a result of the in vivo applications, a statistically significant decrease was observed in the activities of G6PD (p < 0.05), 6PGD (p < 0.05), GR (p < 0.05), and GST (p < 0.05) enzymes in the groups that were administered cobalt compared to the control group. It was also found that the activities of G6PD (p < 0.05), 6PGD (p > 0.05), GR (p > 0.05), and GST (p > 0.05) enzymes increased in groups that were administered cobalt + silibinin compared to the group that was administered cobalt. As for in vitro applications, it was found that different Co2+ ions inhibited 6PGD enzyme which was obtained as a result of purification with IC50 = 346.6 mu M value, while silibinin increased 6PGD enzyme activity within the concentration range of 100-750 mu M by 40%. As a result, it was found that cobalt ions had an inhibition effect on G6PD, GR, and GST enzymes, which are vitally important for living metabolism, in vitro and in vivo and inhibited 6PGD enzyme activity in vitro, and silibinin increased these enzyme activities in vivo and 6PGD enzyme activity both in vivo and in vitro and decreased the inhibition effect.
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    Investigation of In Vivo Effects of Carbon Tetrachloride (CCl4) and Quercetin on Some Metabolic Enzyme Activities in Rat Erythrocyte
    (2022) Temel, Yusuf; Akkoyun, Mahire Bayramoğlu; Akkoyun, H. Turan; Bengü, Aydın Şükrü; Karagözoğlu, Fatma
    In the study; the purpose was to investigate the in vivoimpact of carbon tetrachloride (CCl4)andquercetin(Qu)onactivitiesofimportantmetabolicenzymessuchasGlucose6-phosphatedehydrogenase(G6PD),6-phosphogluconatedehydrogenase(6PGD),glutathione reductase(GR)andglutathioneS-transferase(GST)inraterythrocytes. Attheexperimental stage,ratsweredividedinto4groups.1.Group(Control):Pureoliveoilatadosedetermined according to their body weight (1mL/kg) was given to the rats in this group, 2.Group (CCl4: 1.0 mL/kg(ip)(1:1),3.Group(Ku:25)mg/kg(ip),4.Group(CCl4(1.0ml/kg(ip)+Ku(25mg/kg (ip) was injected. The study was continued for 3 days.The results revealed that the activities of; G6PD (p?0.01),6PGD(p?0.01),GR(p?0.001)andGST(p?0.05)enzymeactivitieswere decreasedintheCCl4groupcomparedtothecontrolgroup.Itwasdeterminedthatenzyme activitieswerehigher in CCl4+Qu applied groups compared to CCl4group.Theapplication of Qu caused an increase in theenzyme activity value. This can be accepted as an indication that theinhibitioncausedbyCCI4hasdisappeared.Consequently;ItisthoughtthatQumaybe effective in preventing oxidative damage due to CCl4administration.
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    Investigation of Protecting Effect of Boric Acid against Mercury II Chloride Toxicity in Rat Brain Tissue
    (2020) Akkoyun, H. Turan; Bengü, Aydın Şükrü; Ulucan, Aykut; Akkoyun, Mahire Bayramoğlu; İzgi, Mehmet Sait; Şahin, Ömer; Ekin, Suat
    In this study, the protective effects of boric acid (BA) in the prevention of brain damagecaused by mercury II chloride ( HgCl2) in rats were investigated. In the experiment, 24 adult andWistar albino male rats weighing roundly 200-300 g were used. Group I (Control, n=8): Isotonicsaline (i.p), Group II (HgCl2,n=8):(0.01g/kg)(oral), Group III (HgCl2 + (BA) (n:8): HgCl2(0.01g/kg)+ BA (3.25mg/kg/day i.p.) group were administered. The rats in all groups were sacrificed at theend of the 10th day and their brain tissues were taken. Biochemical parameters including theenzyme activities of SOD, CAT and GSH-Px were measured. The enzyme activity of SOD wasreduced in HgCl2 treated group in comparison to the control group (p<0.001). Activity of theenzyme was increased after BA administration (p?0.001). CAT enzyme activity decreased in HgCl2and HgCl2+BA administered groups with control (p?0.001). An increase in enzyme activity in BAgroup with HgCl2 administered group was observed. GSH-Px enzyme activity decreased in HgCl2(p?0.001) and HgCl2+BA (p?0.05) groups with control. However, an increase was found in BAadministered group with HgCl2 administered group (p?0.001). It is thought that antioxidant enzymeactivities such as SOD, CAT and GSH-Px are significantly changed and BA may have a protectiveeffect in the histopathological examination of brain tissue.
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    Karbontetraklorür’ün Neden Olduğu Sıçan Böbrek Dokusu Hasarlarına Karşı Kuersetin’in Koruyucu Etkisi
    (2019) Akkoyun, H. Turan
    Bu çalışmada, sıçan böbrek dokusunda karbontetraklorür’ün neden olduğu hasara karşı kuersetin’in etkisi araştırıldı. Çalışmada ağırlıkları yaklaşık (200-300) gr ağırlığında 28 adet yetişkin wistar albino sıçan kullanıldı ve dört gruba ayrıldı. 3 günlük uygulamayı takiben sıçanlar anestezi altına alınarak böbrek dokuları alındı. Böbrek dokusunda SOD, CAT, GPx enzim aktiviteleri ve (8- OHdG) düzeyi değerlendirildi. SOD, CAT, GPx enzim aktiviteleri değerlendirildiğinde, kontrol grubuna oranla CCl4 uygulanan grupta enzim aktivitesinde azalış, CCl4 grubuna oranla CCl4 + kuersetin uygulaması yapılan grupta enzim aktivite düzeyinde artış olduğu belirlendi. Çalışmada, karbontetraklorüre maruz kalan sıçanların böbrek dokusunda 8-OHdG düzeyi değerlendirildiğinde; kontrole oranla karbontetraklorür uygulanan grupta artma, yine kontrole oranla karbontetraklorür + kuersetin uygulanan grupta ise artma, karbontetraklorür grubuna oranla ise karbontetraklorür + kuersetin uygulanan grupta düşme olduğu gözlendi. Kuersetinin, CCl4 tarafından indüklenen böbrek doku hasarı üzerine koruyucu etkisinin olduğu kanaatine varıldı.
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    Laboratuvar Hayvanlarından Sıçan, Kobay ve Tavşan’ın Bazı Anatomik, Fizyolojik ve Üreme Özellikleri
    (2023) Geçmez, Kübra; Akkoyun, H. Turan; Kızıl, Meltem; Akkoyun, Mahire Bayramoğlu
    Bu derlemenin amacı önemli laboratuvar hayvanları arasında yer alan sıçan, kobay ve tavşanın (kemirgenler) bazı anatomik, fizyolojik özellikleri ile beslenme, barınma ve üremeleri ile ilgili bilgileri araştırmacıların dikkatine sunmaktır. Bilimsel araştırmalarda, deneylerde ve biyolojik testlerde kullanılan hayvanlar “Deney Hayvanı” olarak tanımlanır. Deney hayvanları bilim insanları tarafından 19. yüzyıldan itibaren giderek artan bir oranda deneysel araştırmalarda kullanılmaya başlanılmıştır. Deneysel çalışmalarda sıçan, kobay ve tavşan en çok kullanılan laboratuvar hayvanları arasında yer alır. Kolay muhafaza edilip bakılabilmeleri, çevrelerine kolaylıkla uyum sağlayabilmeleri, gebelik sürelerinin kısa olması, ucuza temin edilmeleri gibi avantajları nedeniyle ilaç, tedavi, toksikoloji, doku, organ kültürü ve biyoloji ile ilgili çalışmalarda yaygın olarak kullanılmaktadır. Özellikle sıçanlar insan hastalıklarını modellemek için ideal olduklarından dolayı kardiyovasküler hastalıklar, obezite, diyabet gibi metabolik hastalıklar, bir takım nörolojik hastalıklar, depresyon ve benzeri hastalıklar için terapötik ajanlar geliştirmek amacıyla sıklıkla tercih edilen hayvanlardır. Kobayların bilimsel araştırmalardaki kullanım alanları çoğunlukla aşı, serum, immünolojik çalışmalar, enfeksiyöz hastalıklar gibi alanlarken tavşanlar ise genellikle ortopedik araştırmalar ve göğüs cerrahisi gibi çalışmalar için ideal hayvanlardır. İnsanlardaki hastalıkları taklit etmek için uygun olan bu hayvanlarda birçok hastalığın fizyopatogenezi anlaşılır hale gelmektedir. Bunun yanı sıra teşhis ve tedaviye de büyük katkılar sağlamaktadırlar.
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    PROTECTIVE EFFECT OF ASTAXANTHIN AGAINST ALUMINUM INDUCED LIVER OXIDATIVE DAMAGE
    (Parlar Scientific Publications (P S P), 2017) Akkoyun, H. Turan; Bengu, Aydin Sukru; Akkoyun, Mahire Bayramoglu; Ulucan, Aykut; Arihan, Okan
    In this study, protective effect of a potent antioxidant astaxanthine on preventing rat liver damage due to Al exposure was evaluated. In experimental design, 20 Wistar-albino rats were divided into four groups as Control, Aluminum (20 mg/kg/day i.p), Al + Astaxanthine (5 mg/kg/day AST orally, Al 20 mg/kg/day i.p) and AST (5 mg/kg/day). Study was conducted for 14 days. GSH was found significantly low in Al group compared to control and significantly high in AST and AST + Al administered groups compared to Al group(p<0.01). When MDA levels were investigated, an increase in Al administered group compared to control (p<0.01) and a decrease in Al + AST group compared to Al administered group (p<0.001) was found. In CAT enzyme activity level, a significant decrease in Al, AST and Al + AST administered groups compared to control (p<0.001), an increase in AST, Al + AST groups compared to Al administered group (p<0.001) and also an increase in CAT enzyme activity level in AST+Al administered group compared to AST group (p<0.001) was determined. Due to alterations in MDA and GSH levels and CAT enzyme activity in rat liver tissue as well as positive effects of AST in liver tissue histopathological assessments, it was concluded that AST has a protective role against such toxic molecules.
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    PROTECTIVE EFFECT OF ELLAGIC ACID AGAINST CARBON TETRACHLORIDE (CCl4) - INDUCED OXIDATIVE BRAIN INJURY IN RATS
    (Parlar Scientific Publications (P S P), 2018) Akkoyun, H. Turan; Bengu, Aydin Sukru; Ulucan, Aykut; Bayramoglu-Akkoyun, Mahire; Arihan, Okan
    In this study, it was aimed to investigate protective effects of Ellagic acid in rats which have brain damage formed with carbon tetrachloride (CCl4). 28 male Wistar albino rats were separated into 4 groups as Control, CCl4., Ellagic acid and CCl4+ Ellagic acid. From the brain tissue homogenate malondialdehyde (MDA), glutathione (GSH), superoxide dismutase (SOD), gluthation peroxidase (GSH-Px), catalase (CAT) levels were measured and routine histopathological investigation was performed. An increase in MDA level (p<0.01) whereas a decrease in CAT, GSH-Px, SOD (p<0.01) and GSH (p<0.05) levels in CCl4 administered group compared to control was observed. In our study, in the control and Ellagic acid administered groups, no microscopic findings were observed in the brain, while severe lesions were seen in the CCl4 administered group and only mild congestion lesions were seen in the CCl4 + Ellagic acid group. Results of this study suggest a protection by ellagic acid against CCl4 induced brain damage. This protection is possibly via induction of antioxidant protective mechanism which is shown both by biochemical and histopathological methods.
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    Sıçan Böbrek Dokusunda Bakırın Neden Olduğu Oksidatif Stres ve DNA Hasarlarına Karşı Astaksantinin Etkisi
    (2019) Bengü, Aydın Şükrü; Akkoyun, H. Turan; Akkoyun, Mahire Bayramoğlu; İzgi, Mehmet Sait
    Sıçan böbrek dokusunda bakır (Cu+2) ile oluşturulan oksidatif stres ve DNA hasarlarına karşı astaksantin'in(AST) koruyucu özelliği araştırıldı. 28 adet yetişkin wistar albino cinsi sıçan dört gruba ayrıldı. Kontrol grubu:%0.9 NaCl intraperitoneal (i.p.) , Bakır grubu 3 mg kg-1(i.p.) Cu+2, Astaksantin grubu 100 mg kg-1 AST (oral),Bakır+Astaksantin grubu: 3 mg kg-1(i.p.) +100 mg kg-1 AST (oral) uygulandı. 3. günün sonunda sıçanlarınböbrek dokuları alındı. Böbrek homojenatlarında önemli antioksidan enzimlerden SOD, CAT, GPx aktivitelerive 8-hidroksi-2' -deoksiguanozin (8-OHdG) düzeyi değerlendirildi. SOD aktivitesinin bakır uygulanan gruptave bakır+AST uygulanan grupta kontrole oranla azaldığı(p?0.05), gözlemlendi. GPx enzim aktivitesi isebakır(p?0.001) uygulanan ve bakır+AST(p?0.01) uygulanan gruplarda kontrole göre azaldığı belirlendi. CATaktivitesi, kontrol grubuna kıyasla bakır uygulanan grupta düşmenin(p<0.001) olduğu tesbit edildi. 8-OHdGdüzeyinde; kontrole oranla bakır+AST grubunda anlamlı bir artış (p<0.001) belirlendi. Çalışma sonucunda eldeedilen bulguların bu alanda yapılacak olan farklı çalışmalara kaynak olabileceği düşünülmektedir.
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    Sıçanlarda Akciğer Doku Yağ Asit Düzeyleri Üzerinde Kobalt Ve Silibinin Etkileri
    (2024) Akkoyun, H. Turan
    Çalışmada kobalt ve önemli bir flavonoid olan silibin uygulanan sıçanlarda akciğer dokusunun yağ asit içeriğindeki değişimlerin belirlenmesi amaçlandı. 250±300 gr ağırlığında Wistar Albino cinsi 24 sıçan Control(0.5 mL,i.pizotonik), Kobalt(150 mg/kg/gün/oral), Silibinin(100 mg/kg/gün/oral), Kobalt+Silibinin(150 mg/kg/gün+100 mg/kg/gün/oral) olarak 4 gruba ayrıldı. Doku yağ asit analizleri GC kullanılarak gerçekleştirildi. Yağ asitleri analiz sonuçları incelendiğinde, Kontrole kıyasla genel olarak bütün gruplarda doymuş yağ asit düzeylerinde azalma gözlenirken (p>0,05, p<0,01), 16:1 n-7,18:1 n-7,18:1 n-9,18:2 n-6c,18:3 n-3, gibi doymamış yağ asitlerinde kontrole oranla kobalt uygulanan grupta artış, 15:1, 17:1, 22:5 n3, 22:6 n3 ise azalmalar tespit edildi. Silibin uygulanan grupta ise kontrole kıyasla 15:1, 17:1, 18:1 n-9, 20:4 n:6, 22:5 n3, 22:6 n:3, 20:4 n:6 yağ asitlerinde azalmalar belirlenirken bu azalmalardan bazılarının istatistiksel olarak anlamlı olduğu görüldü(p<0.01, p<0.05). Kobalt uygulanan gruba kıyasla; Kobalt+Silibinin uygulanan grupta, 24:0 yağ asit'i hariç diğer tüm doymuş yağ asitlerine (14:0, 15:0, 16:0, 17:0, 17:1, 18:0) kısmi artışlar, bütün tekli doymamış yağ asitlerinde(15:1, 16:1 n-7, 18:1 n-7, 18:1, n-9) değişen oranlarda belirgin artışlar (p<0,01, p<0,05, p<0,001) tespit edildi. Çoklu doymamış yağ asitleri kobalta kıyasla yine Kobalt +Silibinin grubunda; 18:2 n-6c yağ asidi dışındaki tüm çoklu doymamış yağ asitlerinde (18:3 n-3, 20:4 n6, 22:5 n3, 22:6 n3) belirgin artışlar tesbit edildi(p<0.05, p<0.001). Sonuç olarak; Kobalt toksisitesine karşı Silibinin uygulanan sıçan akciğer yağ asit profilini belirlemek üzere yapılan çalışmada; doymuş yağ asidi miktarlarının kontrole oranla, kobalt grubunda azalma göstermesinin bir hasar göstergesi olabileceği düşünülmektedir. Yine kobalt grubunda bazı doymamış yağ asitlerinin artış göstermesinin nedeni olduğunu düşündüğümüz yağ asidi sentezi-enzim aktivitesinin, ileri düzeyde çalışmalarla aydınlatılması gerekmektedir.
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    Öğe
    TAS-TOS Levels in Lower Extremity Ischemia-Reperfusion Damage in Rats Examined the Protective Effect of Quercetin
    (2017) Akkoyun, H. Turan; Akkoyun, Mahire Bayramoğlu; Bengü, Aydın Şükrü; Aydın, Sevinç; Birinci, Ceyhun Birinci; Atçalı, Tuğçe; Demir, Halit
    Amaç: Alt ekstremite iskemi reperfüzyon (I/R) hasarını önlemede Quercetin'in koruyucu etkisinin belirlenmesi amaçlandı. Gereç ve Yöntem: Çalışmada 30 adet 250-350 gr ağırlığında Sprague- Dawley cinsi erkek sıçanlar üç gruba ayrıldı. Birinci gruptaki sıçanlara iskemi-reperfüzyon işlemi yapılmaksızın anestezi işlemi, ikinci gruptaki sıçanların sol alt ekstremitelerine turnike yardımıyla 2 saat iskemi, 2 saat reperfüzyon, üçüncü gruba ise iskemi başlatılmadan 45 dk. önce 50 mg/kg (ip) quercetin uygulamasının ardından 2 saat iskemi, 2 saat reperfüzyon uygulaması yapıldı. Süre sonunda sıçanlardan doku örnekleri alınarak, total antioksidan kapasite (TAS) ve total oksidan statüsü (TOS) düzeyleri değerlendirildi. Bulgular: TAS değerlendirildiğinde; I/R grubunda kontrol grubuna oranla meydana gelen azalışın (p?0.001) anlamlı, kontrol grubuna oranla I/R+Q grubundaki azalışın (p?0.05), yine I/R grubuna oranla, I/R+Q grubunda meydana gelen artışın (p?0.001) istatistiksel olarak anlamlı olduğu belirlendi. TOS miktarları değerlendirildiğinde I/R grubunda kontrol grubuna oranla meydana gelen artışın (p?0.001), kontrol grubuna oranla I/R+Q grubundaki artışın (p?0.05), I/R grubuna oranla, I/R+Q grubunda meydana gelen azalışın (p?0.001) istatistiksel olarak anlamlı olduğu belirlendi. Sonuç: Sıçanlarda deneysel Alt Ekstremite İskemiReperfüzyon Hasarında Quercetinin koruyucu etkisi olduğu ve meydana gelen hasarı azalttığı belirlendi.
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    Öğe
    The effect of astaxanthin and cadmium on rat erythrocyte G6PD, 6PGD, GR, and TrxR enzymes activities in vivo and on rat erythrocyte 6PGD enzyme activity in vitro
    (Wiley, 2018) Akkoyun, Mahire Bayramoglu; Bengu, A. Sukru; Temel, Yusuf; Akkoyun, H. Turan; Ekin, Suat; Ciftci, Mehmet
    In this study, the effects of astaxanthin (AST) that belongs to carotenoid family and cadmium (Cd), which is an important heavy metal, on rat erythrocyte G6PD, 6PGD, GR, and TrxR enzyme activities in vivo and on rat erythrocyte 6PGD enzyme activity in vitro were studied. In in vitro studies, 6PGD enzyme was purified from rat erythrocytes with 2',5'-ADP Sepharose4B affinity chromatography. Results showed inhibition of enzyme by Cd at IC50; 346.5 mu M value and increase of 6PGD enzyme activity by AST. In vivo studies showed an increase in G6PD, 6PGD. and GR enzyme activities (P > 0.05) and no chance in TrxR enzyme activity by AST. Cd ion inhibited GbPD, 6PGD, and GR enzyme activities (P < 0.05) and also decreased TrxR enzyme activity (P > 0.05). AST + Cd group G6PD enzyme activity was statistically low compared with control group (P < 0.05). 6PGD and TrxR enzyme activities decreased without statistical significance (P > 0.05); however, GR enzyme activity increased statistically significantly (P < 0.05).
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    Öğe
    The Effect of Rosa Pisiformis (Christ) D.Sosn on Some Metabolic Enzyme Activities in STZ Applied Diabetic Rats
    (2021) Akkoyun, Mahire Bayramoğlu; Bengü, A. Şükrü; Temel, Yusuf; Akkoyun, H. Turan; Ekin, Suat; Çiftci, Mehmet
    This study was aimed to study in vivo impacts of Rosa pisiformis (Christ) D.Sosn. (VANF F13827 END.) on some metabolic enzymes (G6PD, 6PGD, GR, TrxR and GST) in Streptozotocin (STZ) applied diabetic rats. 32 male Wistar albino rats divided four groups. Group I: Control, Group II:Streptozotocin, Group III: Rosa pisiformis and Group IV: Streptozotocin+Rosa pisiformis. Experimental study contunied for 30 days and enzyme activities were spectrophotometrically measured. R.p.fruit extract and STZ+R.p. fruit extract administrations increased Glucose 6-phosphate dehydrogenase (G6PD) activity meaningfully compared to control (p?0.001). 6-phosphogluconate dehydrogenase (6PGD) enzyme activity reduced in diabetes group compared to control, whereas it increased in R.p. fruit extract and STZ+R.p. fruit administered groups. Glutathione reductase (GR) activity raised in R.p. fruit administered group compared to control group meaningfully (p?0.001). Thioredoxin reductase (TrxR) activity decrease no statistical importance in diabetic rats compared control whereas this activity increased in Rosa pisiformis fruit extract group. Glutathione S-transferases (GST) enzyme activity reduction significantly in STZ group compared to control (p?0.05). As a result, It is thought that the fruits of Rosa pisiformis, which grows as an endemic species belonging to the Rosaceae family, may have a reducing or preventing effect on the 6PGD, TrxR and GST enzyme activities in rats by inhibiting caused by STZ.