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    Cardiovascular effects of resveratrol and atorvastatin treatments in an H2O2-induced stress model
    (Spandidos Publ Ltd, 2014) Soner, Burak Cem; Sahin, Ayse Saide
    Oxidative stress has been implicated in the pathophysiology of several types of cardiovascular disease (CVD). Statins are widely used to inhibit the progression of atherosclerosis and reduce the incidence of CVD. Certain over-the-counter products, including resveratrol, show similar effects to statins and may thus be used in conjunction with statins for the treatment of the majority of patients with CVD. The aim of the present study was to evaluate the effects of atorvastatin, resveratrol and resveratrol + atorvastatin (R+A) pretreatment on myocardial contractions and vascular endothelial functions in the presence of 11209 as an experimental model of oxidative stress in rats. Four groups were established and referred to as the control, atorvastatin, resveratrol and R+A groups. Atorvastatin (40 mg/kg, per oral) and/or resveratrol (30 mg/kg, intraperitoneal) treatments were administered for 14 days. On the 15th day, the thoracic aortas and hearts of the rats were dissected and placed into isolated organ baths. Vascular responses to cumulative doses of H2O2 (1x10(-8)-1x10(-4) M H2O2) with and without N (G)-nitro-L-arginine methyl ester (L-NAME) incubation were measured. In addition, myocardial electrical stimulation (ES) responses to various H2O2 concentrations (1x10(-7)-1x10(-5) M H2O2) were evaluated. In the control and atorvastatin groups, H2O2 application caused a significant dose-dependent decrease in the ES-induced contractions in the myocardial tissue of rats. In the resveratrol and R+A groups, H2O2 application did not significantly affect myocardial contraction at any dose. In all groups, incubatibn with L-NAME caused a significant augmentation in the H2O2 response, revealing that this effect was mediated via the vascular endothelium. In conclusion, pretreatment with R+A for CVD appears to be superior to pretreatment with either agent alone.
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    The effects of botulinum toxin A and papaverine on human saphenous vein and internal mammary artery grafts: an in vitro study
    (Termedia Publishing House Ltd, 2022) Duman, Ipek; Tanyeli, Omer; Dereli, Yuksel; Oltulu, Pembe; Toy, Hatice; Sahin, Ayse Saide
    Introduction: Autologous saphenous vein (SV) and internal mammary ar-tery (IMA) are used as bypass conduits during coronary artery bypass graft surgery. Vasospasm of the arterial and venous grafts may constitute a sig-nificant clinical problem. Pretreatment with a vasodilator drug of the graft ex vivo or intraluminal injection before implantation may be used for spasm prophylaxis. This in vitro study was designed to assess the vasoactive ef-fects and time-dependent changes of botulinum toxin A (BTX-A) and pa-paverine pretreatment on vasospasm of human SV and IMA grafts. Also, histomorphology of the vessels was assessed.Material and methods: SV and IMA segments were suspended in organ baths, and isometric contraction responses to 2 different concentrations of 5-hydroxytryptamine (5-HT) and endothelin-1 (ET-1) were recorded after in-cubation with 2 different concentrations of BTX-A and papaverine at 2 time points (0 h and 2 h).Results: The results revealed the following: 1) incubation with BTX-A and papaverine relaxes both SV and IMA rings contracted with 5-HT and ET-1; 2) the duration of the relaxant effect of BTX-A lasts longer than papaverine; and 3) no apparent histomorphological changes were observed in the grafts under light microscopy.Conclusions: This study demonstrates that in human SV and IMA grafts, pretreatment with both BTX-A and papaverine are safe and have a potent inhibitory effect depending on the vessel and vasoconstrictor agent. The long-lasting vasodilatory effect of BTX-A on vascular smooth muscle may provide promising results in the prevention of venous and arterial graft spasm.
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    Leptin Prevents U46619- and Angiotensin II-Elicited Contraction in Isolated Human Umbilical Vessels
    (Erciyes Univ Sch Medicine, 2022) Duman, Ipek; Soner, Burak Cem; Irian, Salim Yalcin; Sahin, Ayse Saide
    Objective: This study investigated the vasoactive responses of quiescent and pre-contracted isolated human umbilical veins and arteries to cumulative leptin. Materials and Methods: The vasoactive response of umbilical vessels pre-contracted with U46619 (10(-10)M) and angiotensin II (10(-6)M) to cumulative leptin (10(-11)-10(-7)M) were recorded in vitro. Results: Leptin did not affect the artery or vein basal tonus (p=1). The leptin-elicited relaxation in U46619-contracted vessels was greater in veins than in arteries (p<0.001). Incubation with N (omega)-nitro-L-arginine methyl ester (L-NAME) (10(-4)M) prevented the leptin-induced relaxation of the U46619 contraction response in the artery. The E-max and pD(2) values of the L-NAME-incubated veins were lower than those of the non-incubated veins (p<0.001 and p=0.001, respectively). The relaxation in angiotensin II-contracted veins was greater than that of the arteries (p<0.001). Incubation with L-NAME prevented leptin-induced relaxation in angiotensin II-contracted arteries. The E-max of leptin-induced relaxation of L-NAME-incubated veins was significantly lower than that of non-incubated veins (p=0.027); the pD(2) was similar. Conclusion: Leptin did not alter the resting tension of isolated umbilical vessels; however, the results indicated that leptin caused concentration-dependent relaxation in umbilical vessels pre-contracted with U46619 or angiotensin II. The maximum relaxation was greater in veins compared with arteries. Incubation with L-NAME completely inhibited leptin-induced relaxation in arteries and resulted in a significant inhibition in veins.
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    Leptin Prevents U46619- and Angiotensin II-Elicited Contraction in Isolated Human Umbilical Vessels
    (Erciyes Univ Sch Medicine, 2022) Duman, Ipek; Soner, Burak Cem; Irian, Salim Yalcin; Sahin, Ayse Saide
    Objective: This study investigated the vasoactive responses of quiescent and pre-contracted isolated human umbilical veins and arteries to cumulative leptin. Materials and Methods: The vasoactive response of umbilical vessels pre-contracted with U46619 (10(-10)M) and angiotensin II (10(-6)M) to cumulative leptin (10(-11)-10(-7)M) were recorded in vitro. Results: Leptin did not affect the artery or vein basal tonus (p=1). The leptin-elicited relaxation in U46619-contracted vessels was greater in veins than in arteries (p<0.001). Incubation with N (omega)-nitro-L-arginine methyl ester (L-NAME) (10(-4)M) prevented the leptin-induced relaxation of the U46619 contraction response in the artery. The E-max and pD(2) values of the L-NAME-incubated veins were lower than those of the non-incubated veins (p<0.001 and p=0.001, respectively). The relaxation in angiotensin II-contracted veins was greater than that of the arteries (p<0.001). Incubation with L-NAME prevented leptin-induced relaxation in angiotensin II-contracted arteries. The E-max of leptin-induced relaxation of L-NAME-incubated veins was significantly lower than that of non-incubated veins (p=0.027); the pD(2) was similar. Conclusion: Leptin did not alter the resting tension of isolated umbilical vessels; however, the results indicated that leptin caused concentration-dependent relaxation in umbilical vessels pre-contracted with U46619 or angiotensin II. The maximum relaxation was greater in veins compared with arteries. Incubation with L-NAME completely inhibited leptin-induced relaxation in arteries and resulted in a significant inhibition in veins.
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    Neuroprotective Effect of Intrastriatal Caffeic Acid Phenethyl Ester Treatment in 6-OH Dopamine Model of Parkinson's Disease in Rats
    (Hindawi Ltd, 2021) Soner, Burak Cem; Acikgoz, Eda; Inan, Salim Yalcin; Ayla, Sule; Sahin, Ayse Saide; Oktem, Gulperi
    Parkinson's disease (PD) is the second most common neurodegenerative disorder, and the main cause of PD is still not known. Until now, no cure for Parkinson's disease is yet in sight. Caffeic acid phenethyl ester (CAPE) is a polyphenolic component of the propolis, which can be derived from honeybee hive propolis. We aimed to determine the effect of intrastriatal CAPE administration as a neuroprotective agent on 6-hydroxydopamine (6-OHDA)-induced PD model. Adult male Wistar rats weighing 280-320 g were used. The PD model was induced with unilateral intrastriatal 6-OHDA injection. Treatment groups received 20 mu mol/5 mu L/4 day and 80 mu mol/5 mu L/4 day CAPE 24 h after 6-OHDA injection. Eight days after 6-OHDA application, behavioral studies (adhesive tape removal test, open-field test, cylinder test, and apomorphine-induced asymmetric rotational behavior) were performed once more to compare the effects of CAPE on behavior tests. Striatal histological verifications, immunohistochemistry, and stereological quantitation were performed. Our results for the first time showed that, besides improving the motor performance, CAPE treatment also prevents 6-OHDA-induced loss of TH-positive neurons. From our results, CAPE may be a promising clinical agent in the treatment of PD.
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    Relaxation matters: comparison of in-vitro vasodilatory role of botulinum toxin-A and papaverine in human radial artery grafts
    (Bmc, 2019) Tanyeli, Omer; Duman, Ipek; Dereli, Yuksel; Gormus, Niyazi; Toy, Hatice; Sahin, Ayse Saide
    Background: Radial artery (RA) is widely used in coronary artery bypass (CABG) surgery and the prevention of spasm is crucial for graft patency. Botulinum toxin A (BTX-A) and B are commonly used for aesthetic reasons and neuromuscular disorders. They are proven to raise blood flow and increase survival of ischemic skin flaps. In this study we evaluated and compared the vasodilator effects of BTX-A and papaverine on human RA grafts. Methods: After resting 60 min in isolated organ baths, human RA grafts were examined. Contraction responses for different doses of serotonin (5-HT) and endothelin-1 (ET-1) were evaluated as a percent of maximum contraction response elicited by 80 mM potassium chloride (KCl). The inhibitory effects of BTX-A and papaverine on contraction responses taken at the 0th hour were compared with the 1st and 2nd hour responses. Inhibitory effects of BTX-A and papaverine against the contractile agent were evaluated by comparing the results of the first and last (0th and 2nd hour) application. Results: In low concentrations, when we compared the effects of BTX-A (10(-8) M) and papaverine (10(-6) M) on 5-HT, papaverine was found to be more effective at both the 0th and 2nd hour (p < 0.05). Both BTX-A and papaverine inhibited the maximum contractile effect of ET-1 to the same extent at the 0th hour; but, the inhibitory effect of BTX-A was significantly stronger at the 2nd hour (p < 0.05). In high concentrations, when we compared the effects of BTX-A (10(-6) M) and papaverine (10(-4) M) on 5-HT, papaverine showed stronger inhibition (p < 0.05), whereas both agents had similar action of inhibition on ET-1 mediated maximum contraction responses. Conclusion: BTX-A inhibits both ET-1 and 5-HT induced contractions and its effectiveness does not decrease over time as observed with papaverine. This study is the first in the literature using human RA for prevention of vasospasm by BTX-A.
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    Relaxation matters: comparison of in-vitro vasodilatory role of botulinum toxin-A and papaverine in human radial artery grafts
    (Bmc, 2019) Tanyeli, Omer; Duman, Ipek; Dereli, Yuksel; Gormus, Niyazi; Toy, Hatice; Sahin, Ayse Saide
    Background: Radial artery (RA) is widely used in coronary artery bypass (CABG) surgery and the prevention of spasm is crucial for graft patency. Botulinum toxin A (BTX-A) and B are commonly used for aesthetic reasons and neuromuscular disorders. They are proven to raise blood flow and increase survival of ischemic skin flaps. In this study we evaluated and compared the vasodilator effects of BTX-A and papaverine on human RA grafts. Methods: After resting 60 min in isolated organ baths, human RA grafts were examined. Contraction responses for different doses of serotonin (5-HT) and endothelin-1 (ET-1) were evaluated as a percent of maximum contraction response elicited by 80 mM potassium chloride (KCl). The inhibitory effects of BTX-A and papaverine on contraction responses taken at the 0th hour were compared with the 1st and 2nd hour responses. Inhibitory effects of BTX-A and papaverine against the contractile agent were evaluated by comparing the results of the first and last (0th and 2nd hour) application. Results: In low concentrations, when we compared the effects of BTX-A (10(-8) M) and papaverine (10(-6) M) on 5-HT, papaverine was found to be more effective at both the 0th and 2nd hour (p < 0.05). Both BTX-A and papaverine inhibited the maximum contractile effect of ET-1 to the same extent at the 0th hour; but, the inhibitory effect of BTX-A was significantly stronger at the 2nd hour (p < 0.05). In high concentrations, when we compared the effects of BTX-A (10(-6) M) and papaverine (10(-4) M) on 5-HT, papaverine showed stronger inhibition (p < 0.05), whereas both agents had similar action of inhibition on ET-1 mediated maximum contraction responses. Conclusion: BTX-A inhibits both ET-1 and 5-HT induced contractions and its effectiveness does not decrease over time as observed with papaverine. This study is the first in the literature using human RA for prevention of vasospasm by BTX-A.
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    A survey of Turkish hospital patients' use of herbal medicine
    (Elsevier Science Inc, 2013) Soner, Burak Cem; Sahin, Ayse Saide; Sahin, Tahir Kemal
    Introduction: Herbal medicines (HMs) are generally considered safe due to their natural origin and long standing use. Although the use of HMs is common in Turkey, no detailed studies concerning the use or knowledge-attitudes towards HMs have been performed. This study aimed to describe the prevalence, types, reasons, attitudes and possible adverse effects related with HM use in population of Turkish hospital patients. Methods: Patients over 18 years of age were included in the study. Information was collected from a questionnaire completed by both out- and in-patients admitted to the Meram Faculty of Medicine Hospital in Konya between October 1st and December 31st 2012. Questions included herb use, reasons, attitudes and adverse effects. Results: Data from 927 questionnaires, conducted by face to face interviews identified that 48.8% of the study population used HM. Women, government officials (p<0.001), higher education level (p<0.05) and a higher family income (p<0.001) were more likely to use HMs. The most frequently used herbal medicines were Camellia sinensis (14.2%), Rosmarinus officinalis (10.2%) and Zingiber officinale (9.1%). Conclusion: Increased patient awareness about safe HM use is important considering that most HM users are being informed by friends or the media. Depending on the quality of the product, or in the case of being taken in conjunction with other medicines, traditional medicines can cause harmful adverse reactions. HMs have become a part of traditional medicine and healthcare providers need to be aware of how they are used by patients and ensure that health care policies exist to improve their safety and efficacy. (C) 2013 Elsevier GmbH. All rights reserved.