Browsing by Author "Tuncer, Meral"

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    The Effect of Sumatriptan in lschemic Conditions in the Rat Heart
    (2018) Altunkaynak Camca, Hande Ozge; Tecder Unal, Muge; Tuncer, Meral; 32454677
    Objectives: The aim of this study was to investigate the effect of SUM on IR-induced injury in rat heart and its effect on IPC-induced protection. Materials and Methods: The rats were randomly divided into four groups: IR, SUM-IR, IPC, and SUM-IPC. The mean arterial blood pressure and heart rate were recorded to calculate PRP. Standard limb lead 2 ECG were recorded to evaluate arrhythmia parameters. Results: The PRP values in the SUM-IPC group were significantly lower than in the SUM-IR group at the beginning of reperfusion (p<0.05). The incidence of VT in the IPC, SUM-IR, and SUM-IPC groups was significantly lower than in the IR group (p<0.05). VF was only observed in the IR group. Conclusion: SUM protects the heart against IR injury but is not as protective as IPC alone. Although SUM diminishes IPC-induced protection against VT, the preventive effect of SUM against VF may be predictive for cardioprotection in ischemic conditions.
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    Relaxant effect of diallyl sulfide on nonpregnant rat uterus: Involvement of voltage-dependent calcium channels
    (2020) Efe, Oguzhan E.; Lux, K. Michael; Emre Aydingoz, Selda; Tuncer, Meral; 0000-0002-3243-7843; 0000-0003-3360-5092; 0000-0001-7823-7620; 32830389; W-7908-2019; AAD-9901-2021; ABA-4291-2020
    Aim We aimed to determine the effect and mechanism of action of diallyl sulfide (DAS), an active component of sulfur-containing foods such as garlic on rat uterine activity. Methods Isometric tension changes in longitudinal uterine strips obtained from 20 female Sprague-Dawley rats (250-300 g) in estrus stage of estrous cycle were studied in isolated organ baths containing Krebs-Henseleit solution. Results Diallyl sulfide (10(-8)-10(-6) M) caused a concentration-dependent relaxation on KCl (60 mM)-induced contractions and inhibited spontaneous peristaltic activity of uterine strips (P < 0.05). None of the following antagonists significantly changed the inhibitory effect of DAS on both KCl-precontracted uterine strips and spontaneous peristaltic activity of the uterus (P > 0.05): nitric oxide synthase inhibitor L-NAME (10(-4) M), hydrogen sulfide-producing enzymes cystation beta synthase and cystation gamma-lyase inhibitors, aminooxyacetic acid (10(-4) M) and propargylglycine (10(-3) M) and nonselective cyclooxygenase inhibitor indomethacin (10(-4) M). However, in calcium-free Krebs solution containing high KCl (30 mM), DAS significantly inhibited CaCl2(10(-5)-10(-2) M)-induced uterine contractions in a concentration-dependent manner (P < 0.05). Conclusion Diallyl sulfide has a relaxing effect on KCl-contracted rat uterus strips and an inhibitory effect on spontaneous uterine activity, possibly by decreasing the calcium influx into the cytoplasm of uterine smooth muscle cells.
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