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Öğe Central irisin administration suppresses thyroid hormone production but increases energy consumption in rats(Elsevier Ireland Ltd, 2018) Tekin, Suat; Erden, Yavuz; Ozyalin, Fatma; Onalan, Ebru Etem; Cigremis, Yilmaz; Colak, Cemil; Tekedereli, IbrahimIrisin, which is secreted from the skeletal muscle in response to physical exercise and defined as a thermogenic peptide, may play an important role in energy metabolism. Thyroid hormones, which are one of the other influential factors on the metabolic status, increase heat production and are the main regulators of energy metabolism. This study was conducted to determine the possible effects of irisin administration on thyroid hormones. Forty adult male Wistar albino rats were used in the study. The rats were equally divided into 4 groups (n = 10). The brain infusion kit was implanted in the groups, and irisin (or solvent as control) was centrally administered to the rats via osmotic mini pumps for 7 days. During the experiment, food consumption, body weights, and body temperatures of the animals were recorded. Food intake was significantly increased in the groups treated with irisin (p < 0.05), but their body weights were not changed. Hypothalamic TRH gene expression, serum TSH, fT3, and fT4 levels were significantly lower in the groups treated with irisin as compared to the naive and control groups (p < 0.05). In addition, irisin increased UCP1 mRNA expression in white and brown adipose tissue and UCP3 mRNA expression in muscle tissue in rats and also raised their body temperature (p < 0.05). Consequently, although central irisin administration has inhibitory effects on the hypothalamic-pituitary thyroid axis, it seems to be an important agent in the regulation of food intake and energy metabolism.Öğe Does Irisin Affect Uncoupling Protein Levels in Fat and Muscle Tissues?(Wiley-Blackwell, 2016) Tekin, Suat; Sandal, Suleyman; Erden, Yavuz; Onalan, Ebru Etem; Colak, Cemil[Abstract Not Available]Öğe Effect of Intracerebroventricular Administration of Apelin-13 on the Hypothalamus-Pituitary-Thyroid Axis and Peripheral Uncoupling Proteins(Springer, 2018) Erden, Yavuz; Tekin, Suat; Tekin, Cigdem; Ozyalin, Fatma; Yilmaz, Umit; Onalan, Ebru Etem; Cigremis, YilmazApelin, a ligand for G protein-coupled APJ receptor, is a peptide hormone. Although apelin and APJ receptors are determined in hypothalamus and thyroid gland its role in the hypothalamus-pituitary-thyroid (HPT) axis and mechanism of action on energy metabolism is not clear. This suggests that apelin may play a role in the HPT axis and energy metabolism. This study was designed to determine possible effects of centrally administered apelin-13 on the HPT axis and energy metabolism. A total of 40 adult male Sprague Dawley rats were divided into four groups (n=10 each group). Intact rats served as control group while the sham group received vehicle of apelin. Apelin-13 was injected intracerebroventricularly at the doses of 1 and 10nmol, for 7 days in the rats in the experimental group. At the end of the experimental protocol, animals were decapitated and brain, blood, white and brown adipose tissues samples were collected. There was no significant difference between the groups in terms of hypothalamic TRH mRNA levels. Serum TSH levels were significantly higher in all groups compared to the control group (p<0.05). Serum fT3 and fT4 levels were significantly lower in apelin-13 administered groups (p<0.05). Moreover, apelin-13 administered groups had lower levels of UCP1 mRNA in white and brown adipose tissues. UCP3 mRNA expression in muscle tissue was also lower in apelin-13 treated groups (p<0.05). These results indicates that apelin-13 exhibits a decreasing effect on energy consumption through a mechanism involving the peripheral rather than central arms of the HPT axis.Öğe Effect of Intracerebroventricular MOTS-c Infusion on Peripheral Uncoupling Proteins in Rats(Karger, 2021) Bahar, Mehmet Refik; Tekin, Suat; Beytur, Asiye; Onalan, Ebru Etem; Colak, Cemil; Sandal, Suleyman[Abstract Not Available]Öğe Effects of apelin on reproductive functions: relationship with feeding behavior and energy metabolism(Taylor & Francis Ltd, 2017) Tekin, Suat; Erden, Yavuz; Sandal, Suleyman; Onalan, Ebru Etem; Ozyalin, Fatma; Ozen, Hasan; Yilmaz, BayramApelin is an adipose tissue derived peptidergic hormone. In this study, 40 male Sprague-Dawley rats were used (four groups; n=10). Apelin-13 at three different dosages (1, 5 and 50g/kg) was given intraperitoneally while the control group received vehicle the same route for a period of 14 days. In results, apelin-13 caused significant decreases in serum testosterone, luteinizing hormone and follicle-stimulating hormone levels (p<0.05). Administration of apelin-13 significantly increased body weights, food intake, serum low-density lipoprotein and total cholesterol levels (p<0.05), but caused significant decreases in high-density lipoprotein levels (p<0.05). Serum glucose and triglyceride levels were not significantly altered by apelin-13 administration. Significant decreases in both uncoupling protein (UCP)-1 levels in the white and brown adipose tissues and UCP-3 levels in the biceps muscle (p<0.05) were noted. The findings of the study suggest that apelin-13 may not only lead to obesity by increasing body weight but also cause infertility by suppressing reproductive hormones.Öğe Effects of central irisin administration on the uncoupling proteins in rat brain(Elsevier Ireland Ltd, 2016) Erden, Yavuz; Tekin, Suat; Sandal, Suleyman; Onalan, Ebru Etem; Tektemur, Ahmet; Kirbag, SevdaIrisin is a thermogenic peptide that enables the development of brown adipose tissue from white adipose tissue by activating the UCP1. This study has been designed to determine the effects of the irisin on UCPs. Sprague Dawley female rats were used in the study. 1, 3 and 10 mu M concentrations of irisin were injected intracerebroventricularly to the rats, and the control group was received only vehicle. The animals were killed at the 16, 24, and 48 h time intervals and their brains were taken out. The hypothalamus, pituitary gland, hippocampus, cerebellum, striatum and cortex areas were separated and the UCP2, UCP3, UCP4 and UCP5 mRNA levels were determined. Just before the animals were killed, their body temperatures were recorded. It was observed that after application of the high dose irisin, UCP5 mRNA level in the all brain areas increased (p < 0.05); it was also observed that the three doses decreased the UCP4 expression in all brain areas (except the pituitary gland; p < 0.05). The UCP2 and UCP3 mRNA expressions showed significantly increase in cerebellum and striatum (p < 0.05). The UCP2 mRNA expression decreased in hypothalamus, pituitary gland, hippocampus and cortex areas (p < 0.05). It was also observed that the body temperatures of the rats increased depending on the irisin injection and this increase was the most considerable at the 24h (p < 0.05). The results of this study suggest that the UCP2-5 is expressed in different areas of the brain, and the irisin affects this expression, and may have effective roles in some brain functions. (C) 2016 Elsevier Ireland Ltd. All rights reserved.Öğe Effects of intracerebroventricular MOTS-c infusion on thyroid hormones and uncoupling proteins(Springer Heidelberg, 2023) Bahar, Mehmet Refik; Tekin, Suat; Beytur, Asiye; Onalan, Ebru Etem; Ozyalin, Fatma; Colak, Cemil; Sandal, SuleymanThis study was conducted to determine the possible effects of intracerebroventricular MOTS-c infusion on thyroid hormones and uncoupling proteins (UCPs) in rats. Forty male Wistar Albino rats were divided into 4 groups with 10 animals in each group: control, sham, 10 and 100 mu M MOTS-c. Hypothalamus, blood, muscle, adipose tissues samples were collected for thyrotropin-releasing hormone (TRH), UCP1 and UCP3 levels were determined by the RT-PCR and western blot analysis. Serum thyroid hormone levels were determined by the ELISA assays. MOTS-c infusion was found to increase food consumption but it did not cause any changes in the body weight. MOTS-c decreased serum TSH, T3, and T4 hormone levels. On the other hand, it was also found that MOTS-c administration increased UCP1 and UCP3 levels in peripheral tissues. The findings obtained in the study show that central MOTS-c infusion is a directly effective agent in energy metabolism.Öğe Intracerebroventricular MOTS-C Infusion Increases Peripheral Uncoupling Proteins in Rats Generated From Experimental Obesity Model(Wiley, 2019) Tekin, Suat; Onalan, Ebru Etem; Sandal, Suleyman[Abstract Not Available]Öğe Intracerebroventricular MOTS-C Infusion Suppresses Thyroid Hormone Secretion in Rats(Wiley, 2019) Bahar, Mehmet Refik; Tekin, Suat; Beytur, Asiye; Ozyalm, Fatma; Onalan, Ebru Etem; Sandal, Suleyman[Abstract Not Available]Öğe Investigation of the Effects of Mitochondrial-Derived Peptide (MOTS-c) on the Control of Feeding in Obese Rats(Karger, 2018) Durmus, Merve; Tekin, Suat; Onalan, Ebru Etem; Sandal, Suleyman[Abstract Not Available]Öğe The knockdown of stathmin with si-RNA inhibits invasion of mesothelioma(Churchill Livingstone, 2024) Aksoy, Asude; Varoglu, Asuman; Onalan, Ebru Etem; Tektemur, Ahmet; Artas, Gokhan; Koc, Mustafa; Cakmak, MuharremBackground To investigate the mechanism of action of stathmin1 (STMN1) in mesothelioma (MSM) and whether it has any role in its treatment. Methods STMN1 expression was examined using immunohistochemistry in biopsy tissues taken from MSM patients. The relationships between the levels of STMN1 expression in the pathology preparations of MSM patients, and the clinicopathological characteristics of these patients, and their survival times were investigated. Transfection of STMN1-specific siRNA into SPC212 cells was compared to negative control siRNAs. The mRNA levels of genes that may play a role in invasion, apoptosis, and autophagy were evaluated by RT-PCR. Results The expression of STMN1 was shown to be high in MSM tissues (p < 0.05). It was found that the only independent predictor factor affecting the survival time of MSM patients was the disease stage (p < 0.05). STMN1 was significantly reduced after siRNA intervention (81.5%). STMN1 with specific siRNA has been shown to suppress invasion by reducing the mRNA levels of cadherin-6 (CDH6), fibroblast growth factor-8 (FGF8), hypoxia-inducible factor 1 (HIF1A), matrix metallopeptidase 1-2 (gelatinase A) (MMP1-2), and TIMP metallopeptidase inhibitor 2 (TIMP2), which are important markers for invasion. Although the expression of apoptosis and autophagy-related genes, caspase-2 (Casp2) and LC-3, was reduced by silencing STMN1 with specific siRNA in western blot analysis, this effect was not observed in PCR results. Conclusions Immunohistochemical analysis of STMN1 may contribute to the differential diagnosis of MSM, and STMN1 may also be considered as a potential therapeutic target in the early invasive stage of MSM therapy.Öğe Radial Basis Function Artificial Neural Networks Can Predict UCP2 mRNA Levels According to Irisin Dose and Time of Application in the Cerebellum of Rats(Wiley-Blackwell, 2015) Erden, Yavuz; Tekin, Suat; Colak, Cemil; Sandal, Suleyman; Tektemur, Ahmet; Onalan, Ebru Etem; Kirbag, Sevda[Abstract Not Available]Öğe TRPM2 mediates distruption of autophagy machinery and correlates with the grade level in prostate cancer(Springer, 2019) Tektemur, Ahmet; Ozaydin, Seda; Onalan, Ebru Etem; Kaya, Nalan; Kuloglu, Tuncay; Ozercan, Ibrahim Hanifi; Tekin, SuatPurposeTransient receptor potential melastatin 2 (TRPM2), a calcium-permeable ion channel, is shown as a prognostic marker candidate in prostate cancer (PCa) and an important regulator of autophagy. We aimed to determine the changes in TRPM2 and autophagic-apoptotic gene expression levels in human prostate adenocarcinomas, and to investigate the affect of TRPM2 on autophagic pathways in PC-3 cell line.MethodsHuman prostate tissues were classified considering the grade levels and were divided into the control, BPH, and grade 1-5 groups. mRNA expression levels of genes were determined by qPCR. In addition, TRPM2 was evaluated immunohistochemically for each group. In PC-3 cell line, TRPM2 was silenced through siRNA transfection, and autophagy induction was analyzed by acridine orange (AO) staining.ResultsThe qPCR and immunoreactivity results showed that the increased TRPM2 expression levels in human PCa samples were paralleled with higher grade levels. The autophagic-apoptotic gene expressions showed high variability in different grade levels. Also, silencing TRPM2 in PC-3 cells altered autophagic gene expressions and caused autophagy induction according to the AO staining results.ConclusionWe showed that the autophagy-TRPM2 association may take place in the molecular basis of PCa and accordingly this connection may be targeted as a new therapeutic approach in PCa.
