Person: AKBAY, TUĞBA
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AKBAY
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TUĞBA
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Publication Open Access Effects of Exercise and Calorie Restriction on Brain_x000D_ and Testis in Natural Aging Model(2021-04-25) YARAT, AYŞEN; Umay HAKGÜDER;Hazal İPEKÇİ;Tuğba TUNALI AKBAY;Ayşen YARAT;Ebru Emekli ALTURFAN;Ünsal Veli ÜSTÜNDAĞ;Burçin ALEV;Nevin GENC KAHRAMAN;Reyhan ÖZÇELİK;Göksel ŞENERThe aim of our study was to examine the effects of exercise and calorie_x000D_ restriction on various tissue damage and antioxidant parameters_x000D_ in the brain and testis of rats in a natural aging model. For this_x000D_ purpose, male Sprague-Dawley rats were the control group (C),_x000D_ the elderly (A), the elderly with calorie restriction (ACR), the elderly_x000D_ who were exercised (AE) and the elderly who were exercised with_x000D_ calorie restriction (ACRE), they were divided into 5 groups. The control_x000D_ group was composed of three-month-old animals. The other_x000D_ group consisted of 15-month-old rats. Exercise and calorie restriction_x000D_ were applied for 6 weeks. At the end of the experiment, lipid_x000D_ peroxidation (LPO), nitric oxide (NO), glutathione (GSH) levels and_x000D_ superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase_x000D_ (GST) and tissue factor (TF) were determined in brain and_x000D_ testicular tissues homogenates. As a result of the study, the A_x000D_ group’s brain and testis LPO, NO levels and TF activity increased,_x000D_ GSH levels and SOD, CAT and GST activities decreased, when compared_x000D_ to the C group. As a result of our study, an increase in oxidant_x000D_ damage was observed with TF activity in the brain and testis in the_x000D_ natural aging model, and positive effects of exercise and calorie_x000D_ restriction on the antioxidant levels in the brain were determined,_x000D_ especially in aging.Publication Metadata only The Effect of Stinging Nettle (Urtica dioica) Seed Oil on Experimental Colitis in Rats(MARY ANN LIEBERT, INC, 2011) YARAT, AYŞEN; Genc, Zeynep; Yarat, Aysen; Tunali-Akbay, Tugba; Sener, Goksel; Cetinel, Sule; Pisiriciler, Rabia; Caliskan-Ak, Esin; Altintas, Ayhan; Demirci, BetulThis study investigated the effect of Urtica dioica, known as stinging nettle, seed oil (UDO) treatment on colonic tissue and blood parameters of trinitrobenzene sulfonic acid (TNBS)-induced colitis in rats. Experimental colitis was induced with 1mL of TNBS in 40% ethanol by intracolonic administration with a 8-cm-long cannula with rats under ether anesthesia, assigned to a colitis group and a colitis + UDO group. Rats in the control group were given saline at the same volume by intracolonic administration. UDO (2.5mL/kg) was given to the colitis + UDO group by oral administration throughout a 3-day interval, 5 minutes later than colitis induction. Saline (2.5 mL/kg) was given to the control and colitis groups at the same volume by oral administration. At the end of the experiment macroscopic lesions were scored, and the degree of oxidant damage was evaluated by colonic total protein, sialic acid, malondialdehyde (MDA), and glutathione levels, collagen content, tissue factor activity, and superoxide dismutase and myeloperoxidase activities. Colonic tissues were also examined by histological and cytological analysis. Pro-inflammatory cytokines (tumor necrosis factor-alpha, interleukin-1 beta, and interleukin-6), lactate dehydrogenase activity, and triglyceride and cholesterol levels were analyzed in blood samples. We found that UDO decreased levels of pro-inflammatory cytokines, lactate dehydrogenase, triglyceride, and cholesterol, which were increased in colitis. UDO administration ameliorated the TNBS-induced disturbances in colonic tissue except for MDA. In conclusion, UDO, through its anti-inflammatory and antioxidant actions, merits consideration as a potential agent in ameliorating colonic inflammation.Publication Open Access Protective effects ofGinkgo biloba extract against mercury(II)-induced cardiovascular oxidative damage in rats(2007-01) YARAT, AYŞEN; Tunali-Akbay, Tugba; Sener, Goksel; Salvarli, Hanife; Sehirli, Ozer; Yarat, AysenPublication Metadata only Inhibitory effect of whey protein concentrate on SARS-CoV-2-targeted furin activity and spike protein-ACE2 binding in methotrexate-induced lung damage(2022) ÖZBEYLİ, DİLEK; Tufan, Elif; Sivas, Güzin Göksun; Gürel-Gökmen, Begüm; Yılmaz-Karaoğlu, Sümeyye; Ercan, Dursun; Özbeyli, Dilek; Şener, Göksel; Tunali-Akbay, TuğbaPublication Metadata only Melatonin improves hyperglycemia induced damages in rat brain(WILEY, 2018) YARAT, AYŞEN; Gurel-Gokmen, Begum; Ipekci, Hazal; Oktay, Sehkar; Alev, Burcin; Ustundag, Unsal Veli; Ak, Esin; Akakin, Dilek; Sener, Goksel; Emekli-Alturfan, Ebru; Yarat, Aysen; Tunali-Akbay, TugbaBackground Diabetes mellitus is an endocrine disorder which is characterized by the development of resistance to the cellular activity of insulin or inadequate insulin production. It leads to hyperglycemia, prolonged inflammation, and oxidative stress. Oxidative stress is assumed to play an important role in the development of diabetic complications. Melatonin is the hormone that interacts with insulin in diabetes. Therefore, in this study, the effects of melatonin treatment with or without insulin were examined in diabetic rat brain. Methods Results Rats were divided into five groups as control, diabetes, diabetes + insulin, diabetes + melatonin, and diabetes + melatonin + insulin. Experimental diabetes was induced by streptozotocin (60 mg/kg, i.p.). Twelve weeks after diabetes induction, rats were decapitated. Malondialdehyde, glutathione, sialic acid and nitric oxide levels, superoxide dismutase, catalase, glutathione-S-transferase, myeloperoxidase, and tissue factor activities were determined in brain tissue. Melatonin alone showed its antioxidant effect by increasing brain glutathione level, superoxide dismutase, catalase, and glutathione-S-transferase activities and decreasing malondialdehyde level in experimental diabetes. Although insulin did not have a significant effect on glutathione and glutathione-S-transferase, its effects on lipid peroxidation, superoxide dismutase, and catalase were similar to melatonin; insulin also decreased myolopeoxidase activity and increased tissue factor activity. Combined melatonin and insulin treatment mimicked the effects of insulin. Conclusion Addition of melatonin to the insulin treatment did not change the effects of insulin, but the detailed role of melatonin alone in the treatment of diabetes merits further experimental and clinical investigation.Publication Metadata only Silymarin, the antioxidant component of Silybum marianum, prevents sepsis-induced acute lung and brain injury(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2008) VELİOĞLU ÖĞÜNÇ, AYLİZ; Toklu, Hale Z.; Akbay, Tugba Tunali; Velioglu-Ogunc, Ayliz; Ercan, Feriha; Gedik, Nursal; Keyer-Uysal, Meral; Sener, GokselBackground. Sepsis is associated with enhanced generation of reactive oxygen species, which leads to multiple organ dysfunctions. Based on the potent antioxidant effects of silymarin, we investigated the putative protective role of silymarin against sepsis-induced oxidative damage in lung and brain tissues. Materials and methods. Sepsis was induced by cecal ligation and perforation (CLP). Sham and CLP groups received either vehicle or silymarin (50 mg/kg, p.o.) or 150 mg/kg i.p. N-acetylcysteine (NAC) for 10 days prior and immediately after the operation. Six hours after the surgery, rats were decapitated and blood was collected for the measurement of proinflammatory cytokines (tumor necrosis factor-alpha, interleukin-1 beta, and IL-6) levels, lactate dehydrogenase activity, and total antioxidant capacity. Lung and brain samples were taken for the measurement of malondialdehyde and glutathione levels, myeloperoxidase activity, thromboplastic activity, and also for histological assessment. Formation of reactive oxygen species in tissue samples was monitored by using chemiluminescence technique with luminol and lusigenin probe. Results. Sepsis increased serum TNF-alpha, IL-1 beta, IL-6 levels, and lactate dehydrogenase activity and decreased total antioxidant capacity. On the other hand, tissue glutathione levels were decreased while malondialdehyde levels and myeloperoxidase activity were increased in both the lung and the brain tissues due to CLP. Furthermore, luminol and lucigenin chemiluminescence were significantly increased in the CLP group, indicating the presence of the oxidative damage. Silymarine and NAC treatment reversed these biochemical parameters and preserved tissue morphology as evidenced by histological evaluation. Conclusions. Silymarin, like NAC, reduced sepsis-induced remote organ injury, at least in part, through its ability to balance oxidant-antioxidant status, to inhibit neutrophil. infiltration, and to regulate the release of inflammatory mediators. (C) 2008 Elsevier Inc. All rights reserved.Publication Metadata only The effect of Myrtus communis L. ethanol extract on the small intestine and lungs in experimental thermal burn injury(PERGAMON-ELSEVIER SCIENCE LTD, 2020) ŞEN, ALİ; Ozcan, Ozan; Ipekci, Hazal; Alev, Burcin; Ustundag, Unsal Veli; Sen, Ali; Emekli-Alturfan, Ebru; Sener, Goksel; Yarat, Aysen; Tunali-Akbay, TugbaThermal trauma can damage organs away from the skin burn site and lead to multiple organ dysfunction. Following thermal injury, all tissues are exposed to ischemia, and as a result, resuscitation and reperfusion occur during the burning shock. Burn damage starts systemic inflammatory reactions that produce toxins and reactive oxygen radicals that lead to peroxidation. This study aimed to investigate, for the first time, the possible antioxidant effects of Myrtus communis ethanol extract on burn-induced oxidative distant organ injury orally. The thermal trauma was generated under ether anesthesia by exposing the dorsum of rats to 90 degrees C water bath for 10 s. 100 mg/kg/day Mrytus communis ethanol extract was applied orally for two days. Malondialdehyde (MDA) and glutathione (GSH) levels, glutatinone-S-transferase (GST), superoxidedismutase (SOD) and catalase (CAT) activities were determined to detect the possible antioxidant effects of myrtle on small intestine and lung tissues. Burn damage significantly increased MDA levels in lung and small intestine tissues, and significantly decreased GSH levels, CAT and GST activities in the small intestine and lung tissues compared to control group. Mrytus communis ethanol extract decreased MDA level and increased GSH level, SOD, CAT and GST activities significantly in either small intestine or lung tissues. Mrytus communis extract may be an ideal candidate to be used as an antioxidant adjunct to improve oxidative distant organ damage to limit the systemic inflammatory response and decreasing the recovery time after thermal injury.Publication Open Access Investigation of beta-lactoglobulin derived bioactive peptides against SARS-CoV-2 (COVID-19): In silico analysis(ELSEVIER, 2021-01) OKUYAN, BETÜL; Cakir, Bilal; Okuyan, Betul; Sener, Goksel; Tunali-Akbay, TugbaThe coronavirus disease of 2019 (COVID-19) outbreak caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which started in late 2019 in Wuhan, China spread to the whole world in a short period of time, and thousands of people have died due to this epidemic. Although scientists have been searching for methods to manage SARS-CoV-2, there is no specific medication against COVID-19 as of yet. Two main approaches should be followed in the treatment of SARS-CoV-2; one of which is to neutralize the virus, and the other is to inhibit the host cell membrane receptors, where SARS-CoV-2 will bind. In this study, peptides derived from beta-lactoglobulin, which inactivates both the virus and its receptors in the host cell, were identified using computer-based in silico analysis. The beta-lactoglobulin derived peptides used in this study were obtained by the treatment of goat milk whey fraction with trypsin. The structure of the peptides was characterized by the liquid chromatography quadrupole time-of-flight mass spectrometry (LC-Q-TOF/MS), and six beta-lactoglobulin derived peptides were selected as candidate peptides. Subsequently, the effects of peptides on SARS-CoV-2 and host cells were identified using virtual screening. According to the results of this in silico analysis, Ala-Leu-Pro-Met-His-Ile-Arg (ALMPHIR) and Ile-Pro-Ala-Val-Phe-Lys (IPAVFK) peptides were evaluated as potential candidates to be used in the treatment of SARS-CoV-2 after the future in vitro and in vivo studies.Publication Open Access Myrtle improves renovascular hypertension-induced oxidative damage in heart, kidney, and aortic tissue(2022-07-01) ŞEN, ALİ; ŞENER, GÖKSEL; AKBAY, TUĞBA; Arslan S., Ozcan O., Gurel-Gokmen B., ÇEVİKELLİ YAKUT Z. A., Saygi H. I., ŞEN A., GÖGER F., ERKANLI ŞENTÜRK G., Sener G., Tunali-Akbay T.Renovascular hypertension is defined as the reduction in renal perfusion resulting in sustained hypertension. This study aims to investigate the possible effects of myrtle leaf extract (Myrtus communis L.) on, heart, kidney and aorta tissues in the experimental renovascular hypertension (RVH). 32 male Wistar Albino rats were divided into four groups as control, hypertension, hypertension+ramipril, and hypertension+myrtle leaf extract treatment groups. RVH model was induced by Goldblatt\"s 2-kidney 1-clip method. 12 weeks later than the treatment blood pressures were recorded and oxidant and antioxidant parameters, tissue factor activity, and histological analysis were determined in the kidney, heart, and aortic tissues. The blood pressure levels of the hypertension group significantly increased compared to the control group. Administration of myrtle leaf extract and ramipril significantly decreased the increased blood pressure. In the hypertension group, oxidative damage increased in the kidney, heart, and aorta tissues. In the histological evaluation of tissues in RVH, heart muscle fibres degenerated. Bowman capsule and glomeruli dilated and tubules damaged in the kidney. Myrtle leaf extract administration regenerated the damages and degenerations. The administration of myrtle leaf extract restored the impaired oxidant-antioxidant balance in the heart, kidney and aorta tissues of hypertensive rats. Myrtle leaf extract can be considered as an alternative antihypertensive treatment target in the prevention of oxidative stress-induced damage in renovascular hypertension.Publication Open Access The effect of silymarin on the liver in thermal burn injury(2014-05-13) YARAT, AYŞEN