Person: GÜLER, ERAY METİN
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Publication Metadata only Toxicity of Sodium Fluoride in Adult Retinal Pigment Epithelial Cells Related to Transepithelial Resistance Mechanism(2020-03-17T00:00:00Z) Erkan, Muhammed Abdulkadir; UMURHAN AKKAN, JÜLİDE CANAN; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİM; UMURHAN AKKAN, JÜLİDE CANAN; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİMPublication Open Access Circulating levels of cytokines are increased in restless legs syndrome.(2020-10-21T00:00:00Z) Uslu, FI; Koçyiğit, A; Demir, E; Güler, Eray Metin; USLU, FERDA; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİMBackground: Restless legs syndrome [RLS] is known as a disease of iron and dopaminergic dysregulation but inflammatory processes might also have a role in the pathogenesis. In this study, we compared the circulating levels of hsCRP, IL-1β, IL-6, and TNF-α in patients with primary restless legs syndrome [RLS] and healthy control subjects. Methods: We prospectively included 29 patients with primary RLS and 65 healthy controls [HC], all age-sex matched. The diagnosis of RLS was established using international guidelines. IRLSSG Severity Scale was used to evaluate the severity of RLS. Plasma levels of hsCRP, IL-1β, IL-6, and TNF-α were measured in all participants. Results: The mean age of patients was 37.8 ± 11.3 and 52% of RLS group were women. Serum IL-1β, IL-6, and TNF-α levels of the patient group were statistically significantly higher compared to HC [p < 0.001 for all variables]. Plasma levels of hsCRP did not differ between groups. There were 8 patients with mild RLS [28%], 13 patients with moderate RLS [45%], and 8 patients with severe RLS [28%]. Only IL-6 values were significantly different between the groups. In the severe group, the value of IL-6 was significantly higher than in the other groups [p: 0.03]. Conclusion: These results showing higher circulating levels of inflammatory cytokines in patients with RLS support the notion that inflammation may be involved in the pathogenesis of primary RLS. However, it is necessary to perform further studies to determine if this finding is a cause or an effect.Publication Metadata only Investigation of Oxidative Stress and Inflammation in Restless Legs Syndrome(2020-03-17T00:00:00Z) Demir, Ervanur; USLU, FERDA; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİM; USLU, FERDA; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİMPublication Metadata only Investigation of N-terminal Pro Brain Natriuretic Peptide, Oxidative Stress, and Thiol Disulfide Homeostasis in Vitiligo Patients(2020-03-17T00:00:00Z) Kutlu, Büşra; EMİROĞLU, NAZAN; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİM; EMİROĞLU, NAZAN; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİMPublication Metadata only Comparative Effects of Combustible Cigarette and IQOS on Experimental Rat Model(2020-03-17T00:00:00Z) Demir, Sena Nur; Ogun, Hamza; GÜLER, ERAY METİN; Bozali, Kubra; Kadı, Ömer Faruk; Yıldırım, Kadir Berat; KOÇYİĞİT, ABDÜRRAHİM; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİMPublication Metadata only The Effect of Antiretroviral Therapy on IL-6, IL-1β, TNF-α, IFN-γ Levels and their Relationship with HIV-RNA and CD4+ T Cells in HIV Patients.(2020-07-12T00:00:00Z) Koc, MM; Kocyigit, A; Yabaci, A; Guler, Eray Metin; Okay, G; Akkoyunlu, Y; OKAY, GÜLAY; MERİÇ KOÇ, MELİHA; GÜLER, ERAY METİN; YABACI TAK, AYŞEGÜL; KOÇYİĞİT, ABDÜRRAHİM; AKKOYUNLU, YASEMİNPublication Metadata only Rheum ribes L.’nin etanol ekstraktlarının malign melanomahücreleri üzerine anti-kanser etkinliği(2020-03-01T00:00:00Z) KİRMİT, ADNAN; TAKIM, KASIM; BALKAN, EZGİ; GÜLER, ERAY METİN; YENİGÜN, VİLDAN BETÜL; BULUT, HURİ; KOÇYİĞİT, ABDÜRRAHİM; BALKAN, EZGİ; GÜLER, ERAY METİN; YENİGÜN, VILDAN BETÜL; KOÇYİĞİT, ABDÜRRAHİMPublication Metadata only Comparing healing effect against ulcerative colitis and toxicological effects of Rosmarinus officinalis: A comprehensive in vivo study of an edible plant in rats(2022-07-01T00:00:00Z) YILMAZ, ANIL; UÇKAYA, FATİH; BAYINDIR, NİHAN; GÜLER, ERAY METİN; TOPRAK, ALİ; KOÇYİĞİT, ABDÜRRAHİM; EŞREFOĞLU, MUKADDES; TOPÇU, GÜLAÇTI; UÇKAYA, FATİH; BAYINDIR, NİHAN; GÜLER, ERAY METİN; TOPRAK, ALİ; KOÇYİĞİT, ABDÜRRAHİM; EŞREFOĞLU, MUKADDES; TOPÇU, GÜLAÇTIUlcerative colitis (UC) is a chronic and inflammatory disorder of the gastrointestinal (GI) tract. UC usually worsens the daily life of the patient and may sometimes become mortal. There is no known remedy discovered against UC, yet. Rosmarinus officinalis consists of many flavonoids, phenolics, and terpenoids possessing various biological activities such as anti-inflammatory. For this reason, in the present study, anti-ulcerative colitis effect of ROME (Rosmarinus officinalis methanol extract) was investigated comprehensively by histopathological studies, a number of in vivo anti-inflammatory activities and several in vivo antioxidant activities, in addition to in vitro antioxidant activities and biochemical analyses. In addition, the toxic effects of ROME were examined. The results showed that ROME provided a significant healing effect against ulcerative colitis in rats. Both in vitro and in vivo assay results correlated with histopathological examinations. ROME exhibited minimal toxic alterations. When the results of rosemary are compared with the results of sulfasalazine, it can be suggested that instead of synthetic drugs with side effects, natural sources can be used for the treatment of various diseases. Although some activities of rosemary have been investigated in vitro in the previous studies, this is the first study revealing anti-ulcerative colitis effect of rosemary through histopathological studies, in vivo and in vitro assays as well as biochemical analyses overall. Practical applications The results revealed and proved that ROME provided a significant healing effect against ulcerative colitis in rats. When the results of rosemary are compared with the results of sulfasalazine, a commercially available drug on the market, it can be suggested that instead of synthetic drugs with side effects, natural sources can be used for the treatment of various inflammatory diseases such as UC disease. In addition, ROME possesses limited toxic alterations, but not much more than the commercial drug. As a future perspective, lethal and therapeutic doses can be examined and determined. Thus, human studies can be started through this comprehensive in vivo study on rosemary which is commonly used as an edible plant and spice all over the world.Publication Metadata only The Cytotoxic, Genotoxic and Apoptotic Effects Against Colorectal Cancer Cells in Different Concentrations of Prangos Platychlaena(2020-03-17T00:00:00Z) Aksu, Beria; KOÇYİĞİT, ABDÜRRAHİM; GÜLER, ERAY METİN; KOÇYİĞİT, ABDÜRRAHİM; GÜLER, ERAY METİNPublication Open Access Relationship between diabetic polyneuropathy, serum visfatin, and oxidative stress biomarkers(2020-07-01T00:00:00Z) GÜLER, Eray Metin; BÜYÜKAYDIN, BANU; Karaaslan, Tahsin; OLGAÇ, ATİLLA; ZORLU, MEHMET; KISKAÇ, MUHARREM; KOÇYİĞİT, ABDÜRRAHİM; BÜYÜKAYDIN, BANU; GÜLER, ERAY METİN; OLGAÇ, ATİLLA; ZORLU, MEHMET; KISKAÇ, MUHARREM; KOÇYİĞİT, ABDÜRRAHİMBackground: Diabetic polyneuropathy is a very common complication of diabetes. Numerous studies are available in terms of pathogenesis. But examination methods with low reliability are still not standardized and generally time consuming. High-sensitive, easy-to-access methods are expected. Biochemical markers are one of the subjects of research. We aimed to discover a potential biomarker that can be used for this purpose in patients with diabetes who have not yet developed symptoms of neuropathy. Aim: To determine the place and availability of visfatin and thiol-disulfide homeostasis in this disorder. Methods: A total of 392 patients with type 2 diabetes mellitus were included in the study. The polyneuropathy clinical signs were evaluated with the Subjective Peripheral Neuropathy Screen Questionnaire and Michigan Neuropathy Screening Instrument questionnaire and examination. The biochemical parameters, oxidative stress markers, visfatin, and thiol-disulfide homeostasis were analyzed and correlated with each other and clinical signs. Results: Subjective Peripheral Neuropathy Screen Questionnaire and Michigan Neuropathy Screening Instrument questionnaire with examination scores were correlated with each other and diabetes duration (P < 0.005). Neuropathy related symptoms were present in 20.7% of the patients, but neuropathy related findings were observed in 43.9% of the patients. Serum glucose, glycated hemoglobin, and visfatin were positively correlated with each other. Also, these parameters were positively correlated with the total oxidative stress index. Total and native thiol was positively correlated with total antioxidant status and negatively with oxidant status. Inversely thiol-disulfide positively correlated with higher glucose and oxidant status and negatively with total antioxidant status (P < 0.005). There was no correlation between visfatin and thiol-disulphide (P = 0.092, r = 0.086). However, a significant negative correlation was observed between visfatin and total with native thiol (P < 0.005, r = -0.338), (P < 0.005, r = -0.448). Conclusion: Diagnosis of neuropathy is one of the issues studied in patients with diabetes. Visfatin and thiol-disulfide balance were analyzed for the first time in this study with inspiring results.