Yazar "Acet, Ahmet" seçeneğine göre listele
Listeleniyor 1 - 20 / 23
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Aminoguanidin ve kardiyovasküler sistem(İnönü Üniversitesi Sağlık Bilimleri, 2012) Parlakpınar, Hakan; Örüm, Mehmet Hamdi; Acet, AhmetAminoguanidin (AG), yüzyıldan uzun bir süredir bilinen, yapısal olarak L-Arjinin aminoasitine benzeyen, indüklenebilir nitrik oksit sentaz (iNOS)’u selektif olarak inhibe eden, bu şekilde azalmış nitrik oksit (NO) oluşumuna neden olan bir bileşiktir. AG’nin önemli biyolojik etkileri geçtiğimiz yıllarda keşfedilmiştir. Keşfedilen ilk biyolojik etkisi, histamin, putreskin gibi aktif diaminlerin oksidatif deaminasyonunu katalizleyen, diamin oksidaz’ın inhibisyonudur. AG, etkili bir antioksidan ve serbest radikal süpürücüdür. AG hücre ve dokularda lipid peroksidasyonunun oluşumunu önler. Pek çok araştırmacı bu özellikleri üzerinden, AG’nin kardiyovasküler sistemdeki rolünü açıklamaya çalışmıştır. NO vasküler tonusun düzenlenmesi, endotel bütünlüğünün ve permeabilitesinin düzenlenmesi ve miyokard kontraktilitesinin düzenlenmesinde önemli bir rol oynar. Bu derlemede AG’nin kardiyovasküler sistem üzerindeki etkilerinin gözden geçirilmesi amaçlandı.Öğe Assessment of myoelectrical signal parameters in estrogen, progesterone, and human chorionic gonadotropin administered in nonpregnant rat myometrium after ovariectomy(Elsevier Science Inc, 2008) Celik, Onder; Hascalik, Seyma; Tagluk, M. Emin; Elter, Koray; Parlakpinar, Hakan; Acet, AhmetObjective: To investigate the correlation of myoelectrical signals with spontaneous contractile events and physiological states in the nonisolated uterine horn of rats. Design: In vivo uterine myoelectrical activity recording study. Setting: Animal and pharmacology laboratory at Inonu University. Animal(s): Thirty-six female Wistar albino rats. Intervention(s): Six animals were not castrated and served as a sham-operated control group; the other 30 were ovariectomized (OVX) and put into groups: unbiased OVX subjects, estrogen (E)-biased OVX subjects, P-biased OVX subjects, E-plus-P-biased OVX subjects, and hCG-biased OVX subjects. An MP100 A-CE was used for data acquisition, and a personal computer was used for processing. Main Outcome Measure(s): Besides the temporal, spectral, and joint time-frequency (spectrotemporal) analysis, some quantitative measures such as standard deviation and mark to space power I ratios of myoelectrical signals were measured. Result(s): Progesterone, E, and hCG administration down-regulated the power and contraction frequency of the uterine electrical signal. The spectral concentrations that occurred around the 0.9, 0.35, and 0.7 Hz frequency ranges may be distinguishing characteristics for P, E, and hCG, respectively. Conclusion(S): Based on the obtained results, uterine contractions change with ovariectomy and administration of hormones. Progesterone, E, and hCG particularly prolong the quiescent periods of the uterus by reducing the frequency of uterine contractions as well as the power of the myoelectrical activity. Individual or combined use of R. or hCG might favor quiescence of the uterine muscle and the maintenance of pregnancy.Öğe Beneficial effects of apricot-feeding on myocardial ischemia-reperfusion injury in rats(Pergamon-Elsevier Science Ltd, 2009) Parlakpinar, Hakan; Olmez, Ercument; Acet, Ahmet; Ozturk, Feral; Tasdemir, Seda; Ates, Burhan; Gul, MehmetThe present study was undertaken to evaluate the cardio-protective potential of apricot-feeding in the ischemia-reperfusion (I/R) model of rats in vivo. Rats were divided into three groups of 12 rats each. Group 1 was fed with a standard rat chow, groups 2 and 3 were fed with a standard rat chow supplemented with 10% or 20% dried apricot during 3 months before the beginning of I/R studies. To produce I/R, the left main coronary artery was occluded for 30 min, followed by 120 min reperfusion, in anesthetized rats. Infarct sizes were found significantly decreased in 10% (55.0 +/- 4.3%) and 20% (57.0 +/- 2.9%) apricot-fed groups compared to control group (68.7 +/- 2.0%). Light and electron microscopic evaluations of hearts also demonstrated similar beneficial effects on I/R injury in apricot-fed both groups. Total phenolic contents, DPPH radical scavenging and ferric-reducing power as in vitro antioxidant capacities of rat chows were significantly increased after supplementation with apricot for each ratio. Cu, Zn Superoxide dismutase (Cu, Zn SOD) and catalase (CAT) activities were increased, and lipid peroxidation was decreased significantly in the hearts of 20% apricot-fed group after I/R. In conclusion, we clearly demonstrated in vivo cardio-protective activity of apricot-feeding related to its antioxidant phenolic contents in rats subjected to myocardial I/R. (C) 2009 Elsevier Ltd. All rights reserved.Öğe Cardiovascular effects of panax ginseng(Turgut Özal Tıp Merkezi Dergisi, 2016) Parlakpınar, Hakan; Özhan, Onural; Ermiş, Necip; Acet, AhmetCardiovascular Diseases (CVD), being present in 400 million people accross the globe in people of all races, ages and genders is amongst the more important types of diseases present in the World Health Organizations’ “2013-2020 Global Action Plan for the Prevention and Control of Non-communicable Diseases”. CVD are the leading cause of death in the World as well as in Turkey. Ginseng, also known as Panax ginseng root, is widely used in Turkey to prevent tiredness, fatique, and loss of concentration, to improve mental and physical capacity during recovery period, as well as to reduce the degenerative effects of stress. It also acts as adaptogen due to its anti-stress effect while regulating blood sugar in diabetic patients and increasing erectile capacity and libido in cases with erectile dysfunction. In addition, use of Ginseng as a dietary supplement is increasing day by day among individuals with cardiovascular risk factors such as hypertension, hypercholesterolemia, and oxidative damage. In the literature, there is controversial data concerning Panax ginseng’s pharmacological activity on the cardiovascular system. Increasing the synthesis of nitric oxide, it is observed that Ginseng has both hypertensive and hypotensive effects. While it is stated that dietary supplements containing Ginseng affect the autonomic nervous system, but also increases the blood pressure, reduces or making no change, controversial results were obtained. For these conflict data, ginsenoside, first reducing and then increasing the blood pressure, is thought to be responsible. Depending on the acute and chronic use of Ginseng, it has also been observed that various pharmacological activities exist. In this review, we aim to present the cardiovascular effects of Ginseng. Keywords: Alternative Medicine; Cardiovascular System; Panax ginsengÖğe Comparison of the effects of losartan, captopril, angiotensin II type 2 receptor agonist compound 21, and MAS receptor agonist AVE 0991 on myocardial ischemia-reperfusion necrosis in rats(Wiley, 2021) Ozhan, Onural; Parlakpinar, Hakan; Acet, AhmetMyocardial ischemia may occur as a result of pathophysiological and therapeutical applications such as atherosclerosis, thromboembolism, percutaneous transluminal coronary angioplasty, coronary artery bypass, and transplantation. In this study, we aimed to compare the effects of angiotensin (Ang) II type 2 (AT(2)) selective receptor agonist Compound 21 (C21), MAS receptor agonist AVE 0991, Ang II type 1 (AT(1)) selective receptor blocker losartan, and Ang-converting enzyme inhibitor captopril on haemodynamic parameters and infarct size on myocardial ischemia/reperfusion (MI/R)-induced necrosis in rats. To induce necrosis in the heart of rats, reperfusion for 2 h following ischemia for 30 min to the descending branch of the left main coronary artery was achieved. C21 (0.03 mg/kg), AVE 0991 (576 mu g/kg), losartan (2 mg/kg), and captopril (3 mg/kg) were administered as an intravenous infusion at 10 min before and throughout the ischemia. Then, the infarct size and risk area were calculated from the heart. The percentage of myocardial infarct size to area at risk ratio (%IS/AR) of groups was Control (MI/R) group: 48.9 +/- 8.8%; C21 group: 31.1 +/- 7.8%; AVE 0991 group: 29.9 +/- 4.8%; C21 + AVE 0991 group: 28.2 +/- 3.3%; Losartan + AVE 0991 group: 30.8 +/- 5.8%; Captopril + AVE 0991 group: 31.7 +/- 7.7%. %IS/AR of the drug-treated groups decreased significantly when compared to the MI/R group (P < 0.05). Our results indicate that the importance of AT(1), AT(2), and MAS receptors in the MI/R injury. Inhibition of Ang II formation by captopril, blockade of AT(1)receptor with losartan, and stimulation of AT(2)receptor with C21 and MAS receptor with AVE 0991 showed beneficial effects by reducing infarct size.Öğe Dose-Dependent Protective Effect of Ivabradine against Ischemia-Reperfusion-Induced Renal Injury in Rats(Karger, 2012) Beytur, Ali; Binbay, Murat; Sarihan, M. Ediz; Parlakpinar, Hakan; Polat, Alaadin; Gunaydin, M. Orhun; Acet, AhmetBackground/Aims: This study was designed to investigate the dose-dependent protective effect of ivabradine, a specific inhibitor of the cardiac sinoatrial node, on renal ischemia-reperfusion (I/R) injury in rats. Methods: Rats were divided into six groups: group 1, control; group 2, I/R (60 min ischemia followed by 24 h reperfusion); groups 3 and 4, 0.6-6 mg/kg ivabradine; and groups 5 and 6, sham+0.6-6 mg/kg ivabradine. At the end of the study, malondialdehyde (MDA), superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase contents were assayed in the kidney tissues; serum blood levels of urea nitrogen (BUN), creatinine (Cr) and albumin also were determined. Results: Tissue MDA levels were found to be significantly higher in the I/R group, whereas SOD and CAT levels were lower when compared to the control group. Ivabradine (0.6 mg/kg) treatment reduced the MDA levels and elevated the SOD and CAT enzyme activity. Treatment with a dose of 6 mg/kg ivabradine further increased MDA levels and did not ameliorate SOD or CAT activities. Serum levels of BUN and Cr were significantly higher in the I/R group. I/R+0.6 mg ivabradine reduced the elevated BUN and Cr levels. Conclusion:This study indicates that ivabradine exerts a dose-dependent response beyond heart rate reduction against renal I/R injury. Copyright (C) 2011 S. Karger AG, BaselÖğe Effect of clozapine on locomotor activity and anxiety-related behavior in the neonatal mice administered MK-801(Assoc Basic Medical Sci Federation Bosnia & Herzegovina Sarajevo, 2015) Pinar, Neslihan; Akillioglu, Kubra; Sefil, Fatih; Alp, Harun; Sagir, Mustafa; Acet, AhmetAtypical antipsychotics have been used to treat fear and anxiety disturbance that are highly common in schizophrenic patients. It is suggested that disruptions of N-methyl-d-aspartate (NMDA)-mediated transmission of glutamate may underlie the pathophysiology of schizophrenia. The present study was conducted to analyze the effectiveness of clozapine on the anxiety-related behavior and locomotor function of the adult brain, which had previously undergone NMDA receptor blockade during a developmental period. In order to block the NMDA receptor, male mice were administered 0.25 mg/kg of MK-801 on days 7 to 10 postnatal. In adulthood, they were administered intraperitoneally 0.5 mg/kg of clozapine and tested with open-field and elevated plus maze test, to assess their emotional behavior and locomotor activity. In the group receiving MK-801 in the early developmental period the elevated plus maze test revealed a reduction in the anxiety-related behavior (p<0.05), while the open-field test indicated a decrease in locomotor activity (p<0.01). Despite these reductions, clozapine could not reverse the NMDA receptor blockade. Also, as an atypical antipsychotic agent, clozapine could not reverse impairment in the locomotor activity and anxiety-related behavior, induced by administration of the MK-801 in neonatal period.Öğe Effect of endogen-exogenous melatonin and erythropoietin on dinitrobenzene sulfonic acidinduced colitis(Wiley, 2013) Tasdemir, Seda; Parlakpinar, Hakan; Vardi, Nigar; Kaya, Emin; Acet, AhmetInflammatory bowel disease has been linked to elevated T cells. Excessive production of reactive oxygen species and apoptosis are known to be accompanied by intestinal inflammation. This study was designed to investigate the effects of melatonin (MEL) and erythropoietin (EPO), which is a known anti-inflammatory and antiapoptotic agent, in dinitrobenzene sulfonic acid (DNBS)induced colitis in pinealectomized (Px) rats. In microscopically results, epithelial and goblet cell loss, absence of crypts, and increased colonic caspase-3 activity were observed in the DNBS group. Also, in flow cytometric analysis, the percentage of CD4+ T cells was highest in the DNBS group. Treatment with MEL or EPO had a curative effect on DNBS-induced colitis. The MEL+EPO groups showed significantly greater improvement when compared with the other treatment groups. Our results indicate that the combination of EPO and MEL may exert more beneficial effects than either agent used alone.Öğe Effects of ACE inhibition and AT1 receptor blockade on cardiac ischaemia-reperfusion induced mortality and cardiac markers in rats(Turkish Journal of Medical Sciences, 2005) Iraz, Mustafa; Şahin, Şemsettin; Ölmez, Ercüment; Acet, AhmetÖz: Başlık (İngilizce): Öz (İngilizce): Many studies have established the therapeutic benefits of angiotensin-converting enzyme (ACE) inhibitors such as reducing reperfusion arrhythmias, and angiotensin II type 1 (AT1) blocker may have similar effects to ACE inhibitors. In this study, it was aimed to compare the effects of an ACE inhibitor captopril and AT1 receptor blocker losartan on death from arrhythmias and biochemical markers such as cardiac troponin T and I (cTnT, cTnI), myoglobin, creatin kinase (CK), creatine kinase-MB isoenzyme (CK-MB) and aspartate aminotransferase (AST) after cardiac ischemia/reperfusion in an in vivo rat model. Study design and methods: sixty four male rats were divided into four groups: Control, captopril (3 mg/kg), losartan (2 mg/kg) and sham. The drugs were administered intravenously 10 min before ischemia under anesthesia. Except for the sham group, the left coronary artery was occluded for 7 min and followed by 10 the min of reperfusion. Blood pressure, heart rate and ECG were monitored throughout the experiment. Biochemical markers were evaluated from the blood samples obtained at the 10th min of reperfusion. Captopril significantly decreased total ventricular fibrillation (VF) and death due to irreversible VF, while losartan did not. cTnT, myoglobin, total CK and CK-MB levels were higher in the control and drug administered groups than in the sham group. cTnT and cTnI levels were significantly increased after captopril administration in comparison with the control group, while losartan administration had no effect. In conclusion, captopril is more effective than losartan, especially for decreasing death from irreversible VF. In addition, captopril may increase the biochemical cardiac markers in the blood during early reperfusion.Öğe Effects of captopril and angiotensin II receptor blockers (AT1, AT2) on myocardial ischemia-reperfusion induced infarct size(Academic Press Ltd- Elsevier Science Ltd, 2011) Parlakpinar, Hakan; Ozer, Mehmet Kaya; Acet, AhmetThe renin-angiotensin system (RAS) plays a major role in regulating the cardiovascular system, and disorders of the RAS contribute largely to the cardiac pathophysiology, including myocardial ischemia-reperfusion (MI/R) injury. Two subtypes of angiotensin II (Ang II) receptors have been defined on the basis of their differential pharmacological properties. The current study was undertaken to address the question as to whether the inhibition of the angiotensin converting enzyme (ACE) by captopril and the AT(1) and AT(2) receptor blockers losartan and PD123319 modulate MI/R-induced infarct size in an in vivo rat model. To produce necrosis, a branch of the descending left coronary artery was occluded for 30 min followed by two hours of reperfusion. ECG changes, blood pressure, and heart rate were measured during the experiment. Captopril (3 mg/kg), losartan (2 mg/kg), and PD123319 (20 mu g/kg/min) were given in an IV 10 min before ischemia and were continued during the ischemic period. The infarcted area was measured by TTC staining. The volume of infarct and the risk zone was determined by planimetry. Compared to the control group (55.62 +/- 4.00%) both captopril and losartan significantly reduced the myocardial infarct size (30.50 +/- 3.26% and 37.75 +/- 4.44%), whereas neither PD123319 nor PD123319+losartan affected the infarct size volume (46.50 +/- 3.72 and 54.62 +/- 2.43). Our data indicates that captopril and losartan exert cardioprotective activity after an MI/R injury. Also, infarct size reduction by losartan was halted by a blockade of the AT(2) receptor. Therefore, the activation of AT(2) receptors may be potentially protective and appear to oppose the effects mediated by the AT(1) receptors. (C) 2011 Elsevier Ltd. All rights reserved.Öğe Effects of electromagnetic radiation from 3G mobile phone on heart rate blood pressure and ECG parameters in rats(Toxicology and Industrial Health, 2012) Çolak, Cemil; Parlakpınar, Hakan; Ermiş, Necip; Tağluk, Mehmet Emin; Çolak, Cengiz; Sarıhan, Ediz; Dilek, Ömer Faruk; Turan, Bahadır; Bakır, Sevtap; Acet, AhmetEffects of electromagnetic energy radiated from mobile phones (MPs) on heart is one of the research interests. The current study was designed to investigate the effects of electromagnetic radiation (EMR) from thirdgeneration (3G) MP on the heart rate (HR), blood pressure (BP) and ECG parameters and also to investigate whether exogenous melatonin can exert any protective effect on these parameters. In this study 36 rats were randomized and evenly categorized into 4 groups: group 1 (3G-EMR exposed); group 2 (3G-EMR exposed þ melatonin); group 3 (control) and group 4 (control þ melatonin). The rats in groups 1 and 2 were exposed to 3G-specific MP’s EMR for 20 days (40 min/day; 20 min active (speech position) and 20 min passive (listening position)). Group 2 was also administered with melatonin for 20 days (5 mg/kg daily during the experimental period). ECG signals were recorded from cannulated carotid artery both before and after the experiment, and BP and HR were calculated on 1st, 3rd and 5th min of recordings. ECG signals were processed and statistically evaluated. In our experience, the obtained results did not show significant differences in the BP, HR and ECG parameters among the groups both before and after the experiment. Melatonin, also, did not exhibit any additional effects, neither beneficial nor hazardous, on the heart hemodynamics of rats. Therefore, the strategy (noncontact) of using a 3G MP could be the reason for ineffectiveness; and use of 3G MP, in this perspective, seems to be safer compared to the ones used in close contact with the head. However, further study is needed for standardization of such an assumption.Öğe Histamin H2-reseptör blokörleri(İnönü Üniversitesi Tıp Fakültesi Dergisi, 1994) Acet, Ahmet; Ölmez, ErcümentBu derleme, histamin H2-reseptör antagonisti ilaçların klinik farmakolojisi ve peptik ülser hastalığı, Zollinger-Ellison sendromu, gastro-özofageal refluks hastalığı (refluks özofajiti) ve akut stres ülserleri ve erezyonları adıyla bilinen asid-peptik bozukluklarının önlenmesi ve tedavisindeki yararlılıkları ile ilgilidir. Klinikte kullanılmakta olan H2-reseptör blokörü ilaçlar (Simetidin, Ranitidin; Famotidin ve Nizatidin) eşit güçteki dozlarda verildiklerinde benzer etkileri oluştururlar. Simetidin ve daha az oranda ranitidin çeşitli ilaçların metabolizmasını inhibe ederek, bu ilaçlarla etkileşebilirler. Famotidin ve nizatidin ise bunlara göre diğer ilaçlarla daha az etkileşirler. H2-blokör bir ilaçla tedavi düşünüldüğünde diğer ilaşlarla olan etkileşimi, güvenilirliği ve fiyatı göz önünde bulundurulmalıdır.Öğe Histamin H2-reseptör blokörleri(İnönü Üniversitesi Tıp Fakültesi Dergisi, 1994) Acet, Ahmet; Ölmez, ErcümentBu derleme, histamin H2-reseptör antagonisti ilaçların klinik farmakolojisi ve peptik ülser hastalığı, Zollinger-Ellison sendromu, gastro-özofageal refluks hastalığı (refluks özofajiti) ve akut stres ülserleri ve erezyonları adıyla bilinen asid-peptik bozukluklarının önlenmesi ve tedavisindeki yararlılıkları ile ilgilidir. Klinikte kullanılmakta olan H2-reseptör blokörü ilaçlar (Simetidin, Ranitidin; Famotidin ve Nizatidin) eşit güçteki dozlarda verildiklerinde benzer etkileri oluştururlar. Simetidin ve daha az oranda ranitidin çeşitli ilaçların metabolizmasını inhibe ederek, bu ilaçlarla etkileşebilirler. Famotidin ve nizatidin ise bunlara göre diğer ilaçlarla daha az etkileşirler. H2-blokör bir ilaçla tedavi düşünüldüğünde diğer ilaşlarla olan etkileşimi, güvenilirliği ve fiyatı göz önünde bulundurulmalıdır.Öğe İlaca bağlı nefrotoksisitede serbest oksijen radikalleri(Fırat Üniversitesi Sağlık Bilimleri Tıp Dergisi, 2013) Parlakpınar, Hakan; Örüm, Mehmet Hamdi; Acet, AhmetÖz: İlaca bağlı nefrotoksisitenin ortaya çıktığı kişilerin çoğunda, hasarın yatkınlığına sebep olan risk faktörleri bulunmaktadır. Bunlar hastaya, böbreğe ve ilaca spesifik risk faktörleridir. Nefrotoksisite böbreğin bütün kısımlarını etkileyebilir ve bu durum akut ya da kronik böbrek hastalığı, çeşitli tübülopatiler ve proteinürik böbrek hastalıklarını içeren bir ya da daha fazla klinik böbrek patolojileri ile sonuçlanabilir. Tedavi planı, nefrotoksik ajanın toksisiteyi oluşturma mekanizmasına bağlıdır. Bazı ajanların böbrekteki toksik etkisi oksitadif stres ortamı oluşturarak gerçekleşmektedir. Deneysel koşullarda antioksidan tedavinin toksik ajanlara karşı oluşabilecek muhtemel hasarı azalttığı iyi bilinmektedir. Risk faktörlerini tanımlamak ve nefrotoksisite patofizyolojisi hakkında bilgi sahibi olmak, ilaca ve toksinlere bağlı böbrek hasarının azaltılmasında ilk adımdır. Başlık (İngilizce): Free oxygen radicals in drug-induced nephrotoxicity Öz (İngilizce): Many of the patients with drug-induced nephrotoxicity have risk factors that lead to the damage. Among these factors, there are patient, kidney and drug-specific risk factors. All compartments of the kidney can be affected and results in one or more clinical renal pathologies include acute or chronic kidney disease, various tubulopathies and proteinuric renal disease. Treatment plan depends on how to create a form of toxicity. The toxic effect of the some nephrotoxic agents on kidney is realized by creating an oxidative stress atmosphere. It is well established that antioxidant therapy reduced possible damage caused by toxic agents in experimental conditions. Recognizing the risk factors and obtaining of information regarding the pathophysiology of nephrotoxicity are the first step in reducing the renal injury related to drugs and toxins.Öğe Investigation of the effects of thalidomide against global cerebral ıschemia-reperfusion ınjury inrats(KARGER, ALLSCHWILERSTRASSE 10, CH-4009 BASEL, SWITZERLAND, 2018) Mete, Ugur Cem; Ozhan, Onural; Parlakpinar, Hakan; Yildiz, Azibe; Vardi, Nigar; Durhan, Merve; Cigremis, Yilmaz; Kaya, Gul Busra; Acet, AhmetÖğe Kafeik asit fenetil ester (KAFE) ve miyokardiyal iskemi reperfüzyon (Mİ/R) hasarı(İnönü Üniversitesi Sağlık Bilimleri Enstitüsü, 2012) Parlakpınar, Hakan; Örüm, Mehmet Hamdi; Acet, Ahmetİskemi, doku hasarı ile sonuçlanan, dokuya yetersiz oksijen ve besin desteğine yol açan kan akımı durması veya azalmasını ifade eder. Miyokard dokusunun yaşamının devam edebilmesi için iskemik alanın erken reperfüzyonu önemlidir. Ancak reperfüzyonun kendisi de, reperfüzyon hasarı olarak adlandırılan miyokard hücrelerinin ölümü ile sonuçlanır. Miyokardiyal iskemi-reperfüzyon (Mİ/R) hasarının özellikle reperfüzyon dönemindeki artmış serbest radikal üretimi ve hücre içi aşırı kalsiyum yüklenmesi ile ilişkili olduğuna inanılmaktadır. Araştırmacılar, Mİ/R hasarını önlemek için kullanılabilecek ajanlar üzerinde pek çok çalışmalar yapmaktadır. Bal arısı kovanlarından elde edilen propolisin aktif bir bileşeni olan kafeik asit fenetil ester (KAFE)’ nin antikarsinojenik, immünomodülatör, antiinflamatuvar ve antioksidan özelliklerinin olduğu bilinmektedir. KAFE, serbest radikalleri süpüren ve antioksidan enzimleri aktive eden bir ajandır. Bu bulgular KAFE’ nin iskemik kalp hastalıklarının önlenmesi ve tedavisinde, özellikle hayatı tehdit eden reperfüzyon aritmilerinde ve ileriki yaşam kalitesini etkileyebilen infarkt alanının önlenmesinde klinik olarak test edilebileceğini düşündürmektedir. Bu derlemede Mİ/R hasarının mekanizmaları ve KAFE’ nin Mİ/R ile ilgili hasar üzerindeki etkilerinin gözden geçirilmesi amaçlandı.Öğe Kardiyovasküler Sistem ve Anjiotensin II Tip 2 Reseptörü (AT2)(İnönü Üniversitesi Tıp Fakültesi Dergisi, 2004) Parlakpınar, Hakan; Yanılmaz, Muhammed; Ağlamış, Seda; Acet, AhmetAnjiotensin II (AII) gelişimsel, fizyolojik ve patolojik süreç içinde hücresel büyümeyi düzenlemekle birlikte, reninanjiotensin sisteminin de etkili bir peptididir. AII’nin kardiyovasküler hemodinamiyi düzenlemesindeki rolü oldukça güçlü şekilde kanıtlanmıştır. Birçok çalışmada AT1 ve AT2 reseptörleri şeklinde tanımlanan, birbirinden farklı en az 2 tane Anjiotensin II reseptör subtipi olduğu ortaya konulmuştur. AII kardiyovasküler sistem (KVS) üzerindeki pek çok etkisini AT1 reseptörü üzerinden gerçekleştirmekte olup, AT2 reseptörünün katkısı ise çok fazla bilinmemektedir. AT1 ve AT2 reseptörlerinin, hücre büyümesi ve kan basıncı düzenlenmesinde birbirine zıt etkileri vardır. Biz bu derlemede AT2 reseptörlerinin KVS üzerindeki etkilerini ele alacağız.Öğe Melatonin: Emeklilik Yaşı 80 Olur Mu?(Turgut Özal Tıp Merkezi Dergisi, 2000) Ölmez, Ercüment; Şahna, Engin; Ağkadir, Mustafa; Acet, AhmetPineal bezden salgılanan ana madde olan melatonin, Haç olarak lisans almamış olmasına rağmen, ileri sürülen uyku verici ve yaşlanmayı geciktirici özellikleri nedeniyle, ABD'de besin katkı maddesi şeklinde yaygın olarak satılmaktadır. Bugün için, melatoninin, sirkadian ritmlerin, uykunun, ruhsal durumun ve belki üreme, tümör gelişimi ve yaşlanmanın biyolojik regülasyonunda rolü olabileceğine dait bulgular vardır. Ancak, melatoninin insan fizyolojisi ve patofizyolojisindeki rolüne ait belirsizlikler ve şüpheler hala mevcuttur. Bu derlemenin amacı, melatonin hakkında şu andaki bilgilerimizi ve klinik kullanımı ile ilgili beklenti ve yönelimleri özetlemektir.Öğe Protective and therapeutic effects of dexpanthenol on isoproterenol-induced cardiac damage in rats(WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ USA, 2018) Kalkan, Ferhat; Parlakpinar, Hakan; Disli, Olcay M.; Tanriverdi, Lokman H.; Ozhan, Onural; Polat, Alaaddin; Cetin, Asli; Vardi, Nigar; Otlu, Yilmaz O.; Acet, AhmetThe purpose of the study was to explore the protective and therapeutic effects of dexpanthenol (DEX) on isoproterenol (ISO)-induced cardiac damage. Forty rats were distributed into four groups: group I (Control); group II (ISO); ISO (150mg/kg/day) was given to rats once a day for 2 consecutive days with an interval of 24h; group III (DEX+ISO): DEX (250mg/kg) was applied 30min before the first ISO administration and continued in the next two days after second ISO administration; group IV (ISO+DEX): After the ISO treatment at 1st and 2nd days, DEX was given at 3rd and 4th days. Rats were monitored for mean arterial blood pressure (BP), heart rate, oxygen saturation (%SO2), and electrocardiography (ECG). Heart tissue levels of malondialdehyde (MDA), superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPX), reduced glutathione (GSH), total oxidant status (TOS); total antioxidant capacity (TAC), oxidative stress index (OSI), and caspase-3 were determined. BP and SO2 values indicated a significant decrease in the ISO group. Also, T wave negativity was observed in 6 of 10 rats, SOD, CAT, and GPX levels were significantly lower in ISO group than control group. ISO administration increased TOS and OSI levels, whereas DEX treatment significantly reduced these parameters. Also, ISO-induced morphological alterations such as disorganization of cardiomyocytes, loss of myofibrils and cytoplasmic vacuolization whereas these histological damages were significantly decreased in ISO+DEX and DEX+ISO groups when compared to the ISO group. This study implies the cardioprotective effects of DEX on ISO-induced cardiotoxicity.Öğe The protective effect of aminoguanidine on random pattern skin flap survival(Ortadogu Ad Pres & Publ Co, 2007) Aydogan, Hakan; Guerlek, Ali; Parlakpinar, Hakan; Aydogan, Nilay; Acet, AhmetObjective: Distal flap necrosis resulting from ischemia is a serious problem, and increases the cost of treatment. Reactive oxygen radicals (ROS) play an important role in tissue injury and ischemia, and may lead to partial or complete flap necrosis. Aminoguanidine (AG), a potent antioxidant, prevents ROS formation and lipid peroxidation. Besides, AG inhibits inducible nitric oxide synthase (iNOS) leading to decreased generation of nitric oxide (NO). Material and Methods: Rats were randomly divided into three groups: Control, flap elevated saline group, and AG treated group. A caudally based rectangular flap, 3 x 10-cm was elevated on the back of the rats. Flap viability was evaluated 7 days after the initial operation, measuring necrotic areas and total flap areas by computer-assisted planimetry. Malondialdehyde (MDA), NO, glutathione (GSH), glutathione peroxidase (GSH-Px), and superoxide dismutase (SOD) levels were measured in flap skin tissue to observe the effects of AG. Results: Rate of flap necrosis and MDA, NO levels were higher in the saline group compared to the control group, while GSH, GSH-Px, and SOD enzyme activities were reduced. AG administration reduced lipid peroxidation, NO generation and increased GSH, GSH-Px, SOD enzyme activities. Furthermore, it significantly reduced the rate of flap necrosis when compared with the saline group. Conclusion: We believe that AG, a potent antioxidant and iNOS inhibitor, has beneficial effects to improve skin flap viability when distal flap necrosis is a potential complication in longer flaps.
