WoS İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.14627/6
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Article The Therapeutic Role of Ginseng in Promoting Hippocampal Neurogenesis and Ameliorating Cognitive Function Following Whole Brain Radiotherapy in Rats(Springer/Plenum Publishers, 2025) Sahin, Sevim; Bayindir, Nihan; Ertas, Busra; Ceylan, Cemile; Elibol, Birsen; Ozkan, Alper; Sener, GokselWhole-brain radiotherapy (WBRT) is a prevalent technique for managing multiple intracranial metastases, however, the cognitive damage in long-term survivors due to WBTR is a critical concern that impacts patients' quality of life. Panax ginseng, a bioactive compound recognized for its neuroprotective benefits, also enhances cognitive functions, including memory and learning. This study aims to examine the potential protective effects of Panax ginseng supplementation on cognitive dysfunction and the levels of neurogenesis-related proteins in the hippocampus of rats that underwent WBRT, which was delivered as 3 fractions of 6 Gy (total dose 18 Gy) using a linear accelerator. Thirty-six male Sprague-Dawley rats were divided into three groups: radiation, ginseng treatment, and control. After 60 days of Panax ginseng administration (100 mg/kg), behavior tests (Morris water maze and novel object recognition) were performed, followed by western blot analysis of the hippocampus. Results indicated that Panax ginseng supplementation ameliorated radiation-induced cognitive impairments. Additionally, western blot analyses revealed that Panax ginseng promoted neuronal recovery and neuroplasticity processes in the hippocampus, simultaneously exhibiting a neuroprotective mechanism by reducing apoptosis and neurotoxicity markers. Panax ginseng ameliorates cognitive dysfunction after WBRT by enhancing neurogenesis and diminishing cell death in the hippocampus.Article Protective Effect of Artichoke (Cynara scolymus L.) Leaf and Receptaculum Extracts Against Hepatic Encephalopathy in Bile Duct Ligated Rats(Springer/Plenum Publishers, 2025) Kam, Ozkan; Bebitoglu, Berna Terzioglu; Sener, Goksel; Oguz, Elif; Erdogan, Nurettin Fatih; Kilickap, Andac; Hatiboglu, NebileHepatic encephalopathy (HE), complication of liver dysfunction, leads to neurocognitive impairments. Artichoke (Cynara scolymus L.) has been traditionally used for its antioxidant, anti-inflammatory and hepatoprotective properties. This study evaluates artichoke leaf and receptaculum extracts in cholestasis and HE in a rat model. Wistar rats were divided into 6 groups: sham-control, bile duct ligation (BDL), and BDL with low/high-dose leaf or receptaculum extracts. After BDL, physiological saline and extracts (250/500 mg/kg) were administered orally for 28 days. Cognitive activity was evaluated using Morris water maze and novel object recognition tests on day 28. Artichoke extract regulated liver enzymes and bilirubin at high-doses and significantly increased antioxidant enzyme activities reduced by BDL. Elevated 8-Hydroxyguanosine (8-OHdG) levels decreased in liver and brain tissues. Similarly, artichoke extracts reduced cytokine and hydroxyproline (HP) levels elevated by cholestasis. Following BDL, Na+/K+-ATPase levels in brain and liver tissues decreased, while artichoke extract reversed this. Artichoke, particularly high-dose receptaculum, improved impaired performance and increased time in the target quadrant after BDL. Both artichoke leaf and receptaculum extracts improved recognition. Artichoke treatments, especially high-dose receptaculum, reduced hepatic and neuronal damage and improved histological appearance. These findings highlight the therapeutic potential of artichoke extracts for liver fibrosis and related neurocognitive disorders.Article Citation - WoS: 3Citation - Scopus: 5<i>cotinus Coggygria</I> Scop. Attenuates Acetic Acid-Induced Colitis in Rats by Regulation of Inflammatory Mediators(Springer, 2023) Sen, Ali; Ertas, Busra; Cevik, Ozge; Yildirim, Aybeniz; Kayali, Damla Gokceoglu; Akakin, Dilek; Sener, GokselIn traditional medicine, many medicinal plants are used in the treatment of various diseases caused by inflammation. The objective of the present study is to elucidate for the first time the effects of Cotinus coggygria (CC) ethanol extract (CCE) on colonic structure and inflammation of acetic acid-induced ulcerative colitis in rats. Colonic damage was assessed using disease activity index score, enzyme-linked immunosorbent assay, and hematoxylin-eosin staining. Also, in vitro antioxidant activity of CCE was investigated by ABTS methods. Total phytochemical content of CCE was measured spectroscopically. Acetic acid caused colonic damage according to disease activity index and macroscopic scoring. CCE significantly reversed these damages. While the levels of proinflammatory cytokines TNF-alpha, IL-1beta, IL-6, and TGF-1beta increased in tissue with UC, IL-10 level decreased. CCE increased inflammatory cytokine levels to values close to the sham group. At the same time, while markers indicating disease severity such as VEGF, COX-2, PGE2, and 8-OHdG indicated the disease in the colitis group, these values returned to normal with CCE. Histological research results support biochemical analysis. CCE exhibited significant antioxidant against ABTS radical. Also, CCE was found to have a high content of total polyphenolic compounds. These findings provide evidence that CCE might be benefit as a promising novel therapy in the treatment of UC in humans due to high polyphenol content and justify the use of CC in folkloric medicine for treatment of inflamed diseases.Article Citation - WoS: 1Citation - Scopus: 1Carvacrol Improves Cognitive Dysfunction by Decreasing Amyloid-Β Accumulation and Regulating Neuroinflammation in Ovariectomized Renovascular Hypertensive Rats(Springer, 2024) Bayraktar, Duygu; Ertas, Busra; Aydin, Yasemin; Sener, GokselHypertension contributes to both the development and progression of brain damage and cognitive dysfunction in the postmenopausal period in women. Carvacrol (CAR), which can easily cross the blood-brain barrier, exhibits neuroprotective properties due to its antioxidant, anti-inflammatory, and anti-apoptotic effects. In the present study, we have examined the effect of CAR treatment on learning-memory impairment in a post-menopausal hypertensive rat model that was induced by ovariectomy following two-kidney, one-clip renovascular hypertension surgery. From the third week after the establishment of renovascular hypertension in ovariectomized rats, CAR (40 mg/kg) was administered once daily for consecutive 7 weeks by gastric gavage. Systolic blood pressure was estimated by the tail-cuff method once a week. At the end of the study, cognitive functions were evaluated with behavioral tests and also neurochemical changes were measured in serum, cortex, and hippocampus by ELISA test. Blood pressure was decreased with CAR treatment in hypertensive rats. Serum estrogen levels decreased in ovariectomized rats and did not change with CAR treatment. CAR demonstrated beneficial effects on learning and memory tests as determined by increased recognition index, the number of platforms crossed, and time spent in the target quadrant. Due to CAR treatment, there was a marked reduction in the hippocampal and cortex amyloid-beta, osteopontin, interleukin-6 and tumor necrosis factor-alpha levels, and acetylcholinesterase activity, while an increment in neprilysin and interleukin-10 levels was found. In conclusion, since CAR suppressed amyloid-beta deposition and neuroinflammation in ovariectomized-hypertensive rats, it is thought that it may be protective against memory disorders in postmenopausal hypertensive women.Article Citation - WoS: 4Citation - Scopus: 5A Comprehensive Assessment of the Cholinergic-Supporting and Cognitive-Enhancing Effects of <i>rosa Damascena</I> Mill. (damask Rose) Essential Oil on Scopolamine-Induced Amnestic Rats(Wiley, 2024) Terali, Kerem; Ozbeyli, Dilek; Yigit-Hanoglu, Duygu; Baser, Kemal Husnu Can; Sener, Goksel; Aykac, AsliIntroduction: Alzheimer's disease (AD) is a neurodegenerative condition characterized by gradual loss of cognitive abilities (dementia) and is a major public health problem. Here, we aimed at investigating the effects of Rosa damascena essential oil (RDEO) on learning and memory functions in a rat model of amnesia induced by scopolamine, as well as on changes in acetylcholinesterase (AChE) activity, M-1 muscarinic acetylcholine receptor (mAChR) expression, and brain-derived neurotrophic factor (BDNF) levels in the extracted brain tissues. Methods: The control, amnesia (scopolamine, 1 mg/kg/i.p.) and treatment (RDEO, 100 mu L/kg/p.o. or galantamine, 1.5 mg/kg/i.p.) groups were subjected to Morris water maze and new object recognition tests. AChE activity was assayed by ELISA, and M-1 mAChR and BDNF concentration changes were determined by western blotting. Also, using computational tools, human M-1 mAChR was modeled in an active conformation, and the major components of RDEO were docked onto this receptor. Results: According to our behavioral tests, RDEO was able to mitigate the learning and memory impairments caused by scopolamine in vivo. Our in vitro assays showed that the observed positive effects correlated well with a decrease in AChE activity and an increase in M-1 mAChR and BDNF levels in amnestic rat brains. We also demonstrated in an in silico setting that the major components of RDEO, specifically -citronellol, geraniol, and nerol, could be accommodated favorably within the allosteric binding pocket of active-state human M-1 mAChR and anchored here chiefly by hydrogen-bonding and alkyl-pi interactions. Conclusion: Our findings offer a solid experimental foundation for future RDEO-based medicinal product development for patients suffering from AD.Article Citation - WoS: 1Citation - Scopus: 3Investigation of Possible Neuroprotective Effects of Some Plant Extracts on Brain in Bile Duct Ligated Rats(Wiley, 2021) Ozel, Armagan Begum; Cilingir-Kaya, Ozlem Tugce; Sener, Goksel; Ozbeyli, Dilek; Sen, Ali; Sacan, Ozlem; Yarat, AysenThis study aimed to investigate the possible neuroprotective effects of bitter melon (BM), chard, and parsley extracts on oxidative damage that may occur in the brain of rats with bile duct ligation (BDL)-induced biliary cirrhosis. It was observed that lipid peroxidation (LPO), sialic acid (SA), and nitric oxide (NO) levels increased; glutathione (GSH) levels, catalase (CAT) activity, and tissue factor (TF) activity decreased significantly in the BDL group. However, in groups with BDL given BM, chard, and parsley extracts LPO, SA, NO levels decreased; GSH levels and CAT activities increased significantly. No significant differences were observed between groups in total protein, glutathione-S-transferase, superoxide dismutase, and boron. Histological findings were supported by the biochemical results. BM, chard, and parsley extracts were effective in the regression of oxidant damage caused by cirrhosis in the brain tissues. Practical applications Bitter melon (BM), chard, and parsley have antioxidant properties due to their bioactive compounds which are involved in scavenging free radicals, suppressing their production, and stimulating the production of endogenous antioxidant compounds. Since BM, chard, and parsley extracts were found to be effective in the regression of oxidant damage caused by cirrhosis in the brain tissues, these plant extracts may be an alternative in the development of different treatment approaches against brain damage in cirrhosis. At the same time, these species have been used as food by the people for many years. Therefore, they can be used safely as neuroprotective agents in treatment.Article Citation - WoS: 6Citation - Scopus: 5The Effect of Melatonin on Glycoprotein Levels and Oxidative Liver Injury in Experimental Diabetes(Wiley, 2023) Ertik, Onur; Sener, Goksel; Yanardag, RefiyeIn this present study, the duration of melatonin (Mel) administered to diabetic rats was prolonged so as to examine its effects on the biochemical liver parameters of diabetic rats. In the experiment, Male Sprague Dawley rats were divided randomly into five groups; the control, diabetic + Mel, diabetic, diabetic + insulin, and diabetic + Mel + insulin. Diabetes mellitus was induced by administration of a single dose of streptozotocin (60 mg/kg) intraperitoneally and rats were given vehicle as a solvent for Mel every day for 12 weeks. In the diabetic + Mel group, diabetic rats were administered Mel (10 mg/kg/day) for 12 weeks to treat diabetes. The diabetic + insulin group were diabetic rats given insulin (6 U/kg) subcutaneously for 12 weeks. The diabetic + Mel + insulin rats received insulin and Mel at the same dose and time. At the end of the experiment, the animals were decapitated and liver tissues were taken. The protective effect of Mel on liver tissue of diabetic rats was investigated, total antioxidant status, total oxidant status, reactive oxygen species, oxidative stress index, adenosine deaminase, xanthine oxidase, paraoxonase 1, sodium/potassium ATPase, myeloperoxidase, gamma-glutamyl transferase, sorbitol dehydrogenase, tumor necrosis factor-alpha, homocysteine, nitric oxide, glucose-6-phosphate dehydrogenase, and glycoprotein levels were determined in liver tissues. Treatment with Mel and/or insulin has been found to have a protective effect on biochemical parameters. The results showed that administration of Mel to diabetic rats prevented the distortion of the studied biochemical parameters of liver tissues.Correction A Multi-Parameter Evaluation of the Neuroprotective and Cognitive-Enhancing Effects of Origanum Onites L. (turkish Oregano) Essential Oil on Scopolamine-Induced Amnestic Rats (feb,10.1007/S11011-022-00933-6, 2022)(Springer/plenum Publishers, 2022) Aykac, Asli; Terali, Kerem; Ozbeyli, Dilek; Ede, Seren; Albayrak, Omercan; Baser, Kemal Husnu Can; Sener, Goksel[No Abstract Available]Article Citation - WoS: 7Citation - Scopus: 9A Multi-Parameter Evaluation of the Neuroprotective and Cognitive-Enhancing Effects of <i>origanum Onites</I> L. (turkish Oregano) Essential Oil on Scopolamine-Induced Amnestic Rats(Springer/plenum Publishers, 2022) Aykac, Asli; Terali, Kerem; Ozbeyli, Dilek; Ede, Seren; Albayrak, Omercan; Baser, Kemal Husnu Can; Sener, GokselAlzheimer's disease (AD) is a neurodegenerative disorder characterized by progressive deterioration of cognitive functions (dementia) and represents a growing public health concern since the population in the age groups at risk is increasing. The latter raises an urgent need to translate research findings in the basic brain and behavioral sciences into anti-AD drugs and disease-modifying therapies. Origanum onites (L.), also called Turkish oregano, is a perennial and herbaceous plant species grown for centuries for medicinal, cosmetic and culinary purposes. This is the first study to investigate the putative neuroprotective and pro-cognitive activities of O. onites essential oil (OOEO) against scopolamine-induced amnesia of AD-type in Wistar albino rats. The results of behavioral tests revealed that OOEO administration was able to significantly alleviate learning and memory impairments induced by scopolamine in vivo. The observed effects could be attributed to inhibition of acetylcholinesterase activity, attenuation of oxidative stress and prevention of neuronal apoptosis in the hippocampus and frontal cortex of AD rats. Modulation of pro-inflammatory enzymes, including cyclooxygenase-2, inducible nitric oxide synthase and myeloperoxidase, might further contribute to the neuroprotective properties of OEOO, as predicted by our in silico models. These findings offer novel insights into the therapeutic potential of OEOO in patients with AD.