Browsing by Author "Yalin, S."

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Anti-Inflammatory Effects of Usnic Acid in Breast Cancer
(Maik Nauka/interperiodica/springer, 2022) Yildirim, M.; Degirmenci, U.; Akkapulu, M.; Gungor, M.; Oztornaci, R. O.; Berkoz, M.; Yalin, S.
cancer is the most common type of cancer among women. Usnic acid has anticancer and anti-inflammatory potential. In this study, we evaluated the effects of usnic acid on inflammation and oxidative stress in the breast cancer cell line (MCF-7). Cyclooxygenase-2 (COX-2), inducible nitric oxide synthase (iNOS) gene expression, cytokines, nitric oxide (NO), prostaglandin E2 (PGE2) levels and oxidative stress were measured in all groups. Our study showed that usnic acid was decreased NO, VEGF, PGE2 levels, gene expression levels of COX-2 and iNOS in the meantime cytokines (IL 2, CXCL 10, CXCL8, CCL2 (MCP-1), TNF-alpha, IL-6), glutathione levels, moreover decreased GSH and increased MDA levels in dose depended manner. According to our evidence usnic acid was showed potential cytotoxic, anti-inflammatory and pro oxidant role.
The Effect of Rheum Ribes L. on Oxidative Stress in Diabetic Rats
(De Gruyter Open Ltd, 2021) Yildirim, M.; Degirmenci, U.; Akkapulu, M.; Comelekoglu, U.; Balli, E.; Metin Ozcan, T.; Yalin, S.
Rheum ribes L. is a perennial plant that belongs to the family of Polygonaceae, which is often used in traditional therapy because it possesses many bioactivities, such as antioxidant and antibacterial ones. Here we examined the effect of different R. ribes L. extracts on oxidative stress in experimental diabetic rats. Thirty-six rats were divided into six groups as follows: group I, control group; group II, diabetic rats; group III, diabetic rats treated with the aqueous extract of R. ribes L. by gavage at 50 mg/kg for 15 days; group IV, diabetic rats treated by gavage with the ethanolic extract of R. ribes L. at 50 mg/kg for 15 days; group V, nondiabetic rats treated by gavage with the aqueous extract of R. ribes L. at 50 mg/kg for 15 days; group VI, nondiabetic rats treated by gavage with the ethanol extract of R. ribes L. at 50 mg/kg for 15 days. After 15 days, the animals were sacrificed and the liver and kidney tissues of each animal were isolated. Superoxide dismutase (SOD), catalase (CAT), malondialdehyde (MDA) and glutathione peroxidase (GSH-Px) activities in the tissue samples were measured, and histopathologic examination was carried out. R. ribes L. was effective in reducing the oxidative stress and increasing the levels of the antioxidant enzymes. Increased levels of MDA and decreased levels of SOD, CAT and GSH-Px were observed in both the liver and kidney tissues in group II. Decreased levels of MDA and increased levels of SOD, CAT and GSH-Px were observed in group III compared with group II. In group IV, decreased levels of MDA and increased levels of SOD, CAT and GSH-Px were observed in comparison with group II. Diabetes increases oxidative stress and causes a decrease in antioxidant enzyme levels. Both aqueous and ethanolic extracts of R. ribes L. decrease oxidative stress activity and increase the levels of antioxidant enzymes. The ethanol extract of R. ribes L. has a higher antioxidant effect than the aqueous extract. © 2020 2020 Walter de Gruyter GmbH, Berlin/Boston.
The Effect of Sitagliptin and Exenatide on Insulin, Insulin Receptor and Insulin Receptor Substrate Gene Expression in Diabetic Rats
(Maik Nauka/interperiodica/springer, 2023) Yildirim, M.; Mistik, O. Agtas; Yalin, A. E.; Comelekoglu, U.; Berkoz, M.; Arpaci, R. Bozdogan; Yalin, S.
Diabetes mellitus is a chronic metabolic disorder characterized by persistent hyperglycemia that results from abnormal secretion of insulin, inappropriate action of insulin or both. The aim of this study is to determine the effects of exenatide and sitagliptin treatment on the expression of insulin (INS-1), insulin receptor (INSR) and insulin receptor substrate (IRS-1) genes. In this study streptozotocin-induced diabetic rats were treated with sitagliptin (10 mg/kg) and exenatide (0.1 mu g/kg) for 15 days. We measured INS-1, INSR and IRS-1 gene expression levels and examined the histology of pancreatic tissues in all groups. Exenatide and sitagliptin treatment increased gene expression levels of INS-1, INSR and IRS-1.
Pai-1 and Tpa Gene Polymorphisms and Susceptibility To Chronic Obstructive Pulmonary Disease in a Sample of Turkish Population
(Pakistan Medical Association, 2020) Sunnetcioglu, A.; Berkoz, M.; Yildirim, M.; Bora, G.; Yalin, S.
Objective: The aim of this study was to assess the influence of plasminogen activator inhibitor-1 (PAI-1) 4G/5G or tissue plasminogen activator (tPA) I/D polymorphisms in chronic obstructive pulmonary disease (COPD) cases in a sample of Turkish population. Methods: PAI-1 4G/5G and tPA Alu-repeat I/D genetic polymorphisms in 153 COPD subjects and 160 controls were investigated using PCR-RFLP and PCR methods, respectively. Results: 4G allele frequency was 0.62 and 0.39 for COPD and control groups, respectively. 4G allele had an estimated 2.56-fold [95% CI = 1.85-3.53] increased risk of COPD. tPA I allele frequency was 0.55 and 0.50, for COPD and control groups, respectively. I allele had an estimated 1.19-fold [95% CI = 0.87-1.62] increased risk of COPD Conclusions: PAI-1 4G/4G and 4G/5G genotypes seemed to play a key role in the pathophysiology of COPD in Turkish individuals. © 2020 Pakistan Medical Association. All rights reserved.
Punicalagin and Punicalin Suppress the Adipocyte Differentiation Through the Transcription Factors
(Editura Acad Romane, 2021) Berkoz, M.; Yalin, S.; Yildirim, M.; Yalin, A. E.; Comelekoglu, U.
Background. Pomegranate is a rich source of many polyphenolic compounds including ellagitannins (punicalagin, punicalin and others). Aim. The effects of punicalagin and punicalin on adipogenesis were investigated in this study. Materials and Methods. To examine the effect of punicalagin and punicalin on adipocyte differentiation, various concentrations of punicalagin and punicalin (2-10 mu M) were applied to differentiated 3T3-L1 cells. Glyceraldehyde-3-phosphate dehydrogenase (GPDH) activity, Oil red O staining, intracellular triglyceride levels, and gene expressions of transcription factors (Peroxisome proliferator-activated receptor-gamma (PPAR gamma), CCAAT-enhancer-binding proteins-alpha (C/EBP alpha), Sterol regulatory element-binding protein 1c (SREBP-1c)) and lipolysisassociated genes (hormone-sensitive lipase (HSL), Perilipin A, tumor necrosis factor-alpha (TNF-alpha)) were examined in order to investigate the effects of punicalagin and punicalin on adipocyte differentiation. Results. Punicalagin and punicalin applications caused a continuous decrease in cell size and intracellular triglyceride accumulation. GPDH activity and transcription gene expressions decreased significantly in groups that were applicated punicalagin and punicalin at high concentrations. Punicalagin, but not punicalin, down-regulated the expression of HSL and perilipin A and up-regulated the expression of TNF-alpha in a dose-dependent manner. In conclusion, both punicalagin and punicalin were able to inhibit the adipocyte differentiation.