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Yazar "Serhatlioglu, Ihsan" seçeneğine göre listele

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    Apelin has inhibitory effect of endothelium-independent relaxation in the human internal mammary artery
    (2019) Kacar, Emine; Burma, Oktay; Serhatlioglu, Ihsan; Ulker, Nazife; Uysal, Ayhan; Yardimci, Ahmet; Kelestimur, Haluk
    Aim: Apelin has important effects on the circulatory system and heart. The main aim of this study was to investigate the effects of apelin-13 on the contraction induced by norepinephrine (NE), and the endothelium-independent relaxation induced by sodium nitroprusside (SNP) in human internal mammary artery (IMA) obtained from patients undergoing coronary artery bypass grafting (CABG) surgery. Material and Methods: IMA rings, obtained from patients undergoing CABG surgery, were suspended in isolated tissue baths containing Krebs-Henseleit solution, which were continuously gassed with 95% O2 and 5% CO2 at 37°C. Results: The IMA rings were pre-contracted with increasing concentrations of norepinephrine (NE 10-9–10-4 mol/l) and the endothelium-independent relaxation responses to sodium nitroprusside (SNP) were studied. Apelin-13 (10 μM) caused a dosedependent relaxation in NE pre-contracted IMA rings. Apelin also facilitated the endothelium-independent relaxation induced by SNP. Conclusion: According to the results, apelin facilitated the endothelium-independent relaxation and inhibited the contractile activity of IMA. These results suggest that apelin may be a physiological agent against the deterioration of vascular elasticity caused by endothelial damage especially in atherosclerotic cardiac patients and hypertensive patients.
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    Clopidogrel inhibits acetylcholine-induced contractions of urinary bladder in rat
    (2019) Kacar, Emine; Serhatlioglu, Ihsan
    Aim: Clopidogrel as thrombocyte Adenosine Diphosphate (ADP) receptor antagonist is used especially in peripheric artery diseases by lengthening hemorrhage time, disrupting thrombocyte aggregation and decreasing blood viscosity. It shows its antagonist effects through glycoprotein (Gp) IIb/IIIa complex ADP by preventing its activation. Although the usage area and activity is in the vascular system, there are no adequate studies showing the activity of Clopidogrel on smooth muscle contraction-relaxation mechanism. This study was conducted to investigate the effects of Clopidogrel on bladder contraction-relaxation mechanism. Material and Methods: In the present study, the bladder tissues taken from Wistar-Albino (n=7) intact female rats were used. After the decapitation, the longitudinal bladder tissues that were received 1-mm-thick, 8-mm length, and 2-mm-width, were hung in the 5-ml isolated organ bath that had Krebs-Ringer bicarbonate solution by applying 1.5 gr strain. After the bladder contractions were induced with 10 μM dose Acetylcholine (Ach), Clopidogrel was applied as two doses 0.1μM and 10μM in a noncumulative manner. The peak-to-peak (p-p) values and the values below the curve before and after the Clopidogrel application in the contraction induced with Ach were normalized as % change. The statistical analyses of the data were made in the SPSS 22.0 program by applying Paired T-Test. The p<0.05 value was accepted to be statistically significant. Results: When the bladder contractions induced with Ach and the values after Clopidogrel applications were compared, it was determined that there was 79% inhibition in the area values with Clopidogrel at 0.1μM dose; 87% at 10μM dose. In the p-p values, there was inhibition at 0.1μM dose with 63%, at 10μM dose with 64%, each of the two doses, the p-p and area values were found to be statically significant (P<0.001). Conclusions: Clopidogrel, which is used as an anti-aggregate especially in cardio-vascular diseases in clinical practice, has an inhibitory effect on bladder contraction (p-p and area), and the strongest inhibitor effect was observed at 10μM dose.
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    Öğe
    Oxytocin activates calcium signaling in rat sensory neurons through a protein kinase C-dependent mechanism
    (Springer, 2014) Ayar, Ahmet; Ozcan, Mete; Alcin, Ergul; Serhatlioglu, Ihsan; Ozcan, Sibel; Kutlu, Selim; Kelestimur, Haluk
    In addition to its well-known effects on parturition and lactation, oxytocin (OT) plays an important role in modulation of pain and nociceptive transmission. But, the mechanism of this effect is unclear. To address the possible role of OT on pain modulation at the peripheral level, the effects of OT on intracellular calcium levels ([Ca2+](i)) in rat dorsal root ganglion (DRG) neurons were investigated by using an in vitro calcium imaging system. DRG neurons were grown in primary culture following enzymatic and mechanical dissociation of ganglia from 1- or 2-day-old neonatal Wistar rats. Using the fura-2-based calcium imaging technique, the effects of OT on [Ca2+](i) and role of the protein kinase C (PKC)-mediated pathway in OT effect were assessed. OT caused a significant increase in basal levels of [Ca2+](i) after application at the doses of 30 nM (n=34, p<0.01), 100 nM (n=41, p<0.001) and 300 nM (n=46, p<0.001). The stimulatory effect of OT (300 nM) on [Ca2+](i) was persistent in Ca2+-free conditions (n=56, p<0.01). Chelerythrine chloride, a PKC inhibitor, significantly reduced the OT-induced increase in [Ca2+](i) (n=28, p<0.001). We demonstrated that OT activates intracellular calcium signaling in cultured rat primary sensory neurons in a dose-and PKC-dependent mechanism. The finding of the role of OT in peripheral pain modification may serve as a novel target for the development of new pharmacological strategies for the management of pain.

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