Person: AKKAN, AHMET GÖKHAN
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AHMET GÖKHAN
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AKKAN
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Publication Metadata only Cardiac Troponin-I (cTnI) a Biomarker of Cardiac Injuries Induced by Doxorubicin Alone and in Combination with Ciprofloxacin, Following Acute and Chronic Dose Protocol in Sprague Dawley Rats(2014-07-01T00:00:00Z) Shahzadi, Andleeb; Sonmez, Ikbal; Allahverdiyev, Oruc; Onal, Burak; Kandaz, Cemre; Ozyazgan, Sibel Ozmen; Akkan, Ahmet Gökhan; Yazici, Zeliha; AKKAN, AHMET GÖKHANThe present study investigates the release of cardiac troponin-I (cTnI) as a biomarker of cardiac injuries induced by doxorubicin (Doxo) alone and along with ciprofloxacin (Cipro), following acute and chronic dose protocol in Sprague Dawley rats. In chronic protocol, rats were given multiple intra-peritoneal (i.p) injections of Doxo (1 or 2.5 mg kg(-1)) alone or in combination with Cipro (20 mg kg(-1) daily) and a placebo control. Whereas in acute protocol, rats were subjected to receive single i.p. injection of Doxo (6 or 15 mg kg(-1)) alone or along with Cipro (20 mg kg(-1)) and placebo treatment with saline (control). The plasma levels of cTnI were measured by using Enzyme-linked Immuno Sorbent Assay (ELISA) technique. All the treated groups, following acute or chronic dose protocol showed significant increase in cTnI plasma level from 137-248% in comparison to control (p<0.0001). The cTnI plasma levels increased in dose dependent manner after following acute and chronic dose protocol. The difference between two doses following chronic (1 mg kg(-1) vs. 2.5 mg kg(-1)) and acute (6 vs. 15 mg kg(-1)) administration was 34.6 and 31.5%, respectively. Results of this investigation suggest that Doxo alone and in combination with Cipro from both the chronic and acute groups showed cardio-toxicity (release of cTnI). To our knowledge this is the first description towards Doxo-Cipro is induced cardiotoxicity and could be a bridge between preclinical and clinical practice for physicians in making an expert opinion dealing with above mentioned group.Publication Metadata only Temel ve Klinik Farmakoloji (Bertram G. Katzung)(2021-09-01T00:00:00Z) Akkan, Ahmet Gökhan; AKKAN, AHMET GÖKHAN•KEMOTERAPÖTİKLER (Bölüm Çeviri Editörü: A. Gökhan Akkan):•Beta Laktam ve Diğer Hücre Duvar ve Membran Aktif Antibiyotikler (A. Gökhan Akkan, Andleeb Shahzadi)•Tetrasiklinler, Makrolitler, Kloramfenikol, Streptograminler ve Oksazolidinonlar (A. Gökhan Akkan, Fatma Ü. Taşdemir)•Antiviral Ajanlar (A. Gökhan Akkan ve diğerleri)•Antimikrobik Ajanların Klinik Kullanımı (A. Gökhan Akkan) •Antihelmintik İlaçların Klinik Kullanımı (A. Gökhan Akkan)Publication Metadata only B12 VİTAMİNİNİN SIÇANLARDA MORFİNLE OLUŞTURULMUŞ KOŞULLANDIRILMIŞ YER TERCİHİ TESTİNDEKİ ETKİLERİNİN İNCELENMESİ(2021-11-04T00:00:00Z) Faikoğlu, Gökhan; Sönmez, Haktan; Todurga Seven, Zeynep Gizem; Faikoğlu, Kübra; Özyazgan, Sibel; Yıllar, Dündar Okan; Akkan, Ahmet Gökhan; AKKAN, AHMET GÖKHANAmaç: Morfin orta ve şiddetli ağrılar için en etkili analjeziklerden birisidir. Morfin suistimali ve bağımlılığı uluslararası bir sorundur. Bununla birlikte B12 vitaminin morfinin bağımlılık süreçleri üzerindeki rolünü araştıran az sayıda çalışma bulunmaktadır. Burada morfine bağlı koşullu yer tercihi testi (CPP) üzerinde B12 vitaminin etkilerinin ve olası mekanizmalarının araştırıldığı CPP modeli ilaçların ödüllendirici etkilerinin ölçülmesinde kullanılır. Sıçanlar siyah tarafı (grid) beyaz tarafa (mesh) tercih ettiği için -yanlı- CPP prosedürü çalışıldı. Biz bu çalışmada, B12 vitaminin morfinle koşullanmış yer tercihi testinde etkilerini araştırmayı ve olası mekanizmalarını incelemeyi amaçladık. Gereç-Yöntem: Deney habitasyon, ön koşullandırma, koşullandırma ve koşullandırma sonrası aşamalarını takip etti. Yetişkin erkek (250-300 g) Wistar albino sıçanlar rastgele 3 gruba ayrıldı (her grup için n = 8): kontrol (salin), morfin (10 mg/kg) ve B12 vitamini (2 mg/kg) ile morfin kombinasyon grubu. Salin, morfin (10 mg/kg) ve B12 vitamini ile morfin kombinasyonunun CPP etkisi değerlendirildi. Tüm ilaçlar ve salin sıçanlara intraperitoneal (ip) yolla enjekte edildi. Bulgular: Morfin (10 mg/kg) salin grubuna göre anlamlı düzeyde CPP üretti (p<0.0001). B12 vitamini morfine bağlı oluşan bu yer tercihini azalttı ancak bu istatiksel olarak anlamlı değildi. Sonuç: Sonuçlarımız, morfinin yer tercihi oluşturduğunu ve bu yer tercihinin B12 vitamini ile azalma potansiyeli olduğunu gösterdi. Bu veriler; farklı dozlarda B12 vitaminin bu prosedürde araştırılması gerektiğine ve B12 vitaminin morfin bağımlılığı tedavisi için yeni ve önemli bir alan olabileceğine işaret etmektedir. Anahtar Kelimeler: Morfin, B12 vitamini, CPP, Bağımlılık, Sıçan(lar)Publication Metadata only The Anti-Inflammatory Effects of Anacardic Acid on a TNF-alpha Induced Human Saphenous Vein Endothelial Cell Culture Model(2020-01-01T00:00:00Z) DURSUN, Erdinç; Onal, Burak; Ozen, Deniz; Demir, Bulent; Ak, Duygu Gezen; Demir, Caner; Akkan, Ahmet Gökhan; Ozyazgan, Sibel; AKKAN, AHMET GÖKHANBackground and Objective: Coronary bypass operations are commonly performed for the treatment of ischemic heart diseases. Coronary artery bypass surgery with autologous human saphenous vein maintains its importance as a commonly used therapy for advanced atherosclerosis. Vascular inflammation-related intimal hyperplasia and atherosclerotic progress have major roles in the pathogenesis of saphenous vein graft disease.Publication Metadata only Does Inflammation Have a Role in the Pathogenesis of Cardiac Syndrome X? A Genetic-Based Clinical Study With Assessment of Multiple Cytokine Levels(2016-04-01T00:00:00Z) Demir, Bulent; Onal, Burak; Ozyazgan, Sibel; Kandaz, Cemre; UZUN, Hafize; Aciksari, Gonul; Uygun, Turgut; Opan, Selcuk; Karakaya, Osman; Akkan, Ahmet Gökhan; AKKAN, AHMET GÖKHANWe compared Turkish patients with cardiac syndrome X (CSX) and controls with respect to serum pro- and anti-inflammatory cytokine levels, as well as the single-nucleotide polymorphisms located in the promoter regions of their related genes. This study included 111 consecutive patients angiographically diagnosed with CSX and 111 healthy controls with similar demographic characteristics. Serum interleukin (IL) 6, tumor necrosis factor (TNF-), and IL-10 levels were measured, and the genotypes of the patients and controls were determined using standard methods. Serum IL-6 and IL-10 levels were significantly higher in the CSX group than in the control group (P < .01, respectively). Serum TNF- level was lower in the CSX group than in the control group (P < .001). On the other hand, participants with CSX and healthy controls were not significantly different with respect to the genotype distributions of IL-6, TNF-, and IL-10 genes. As a result of our study, both pro-inflammatory and anti-inflammatory cytokines may play a role in the pathogenesis of CSX. In contrast, the studied gene polymorphisms did not influence CSX pathogenesis.Publication Metadata only The effect of Dexmedetomidine on morphine induced dependence in rats(2015-06-22T00:00:00Z) USKUR, B TUĞÇE; BARLAS, MUSTAFA AYDIN; AKKAN, AHMET GÖKHAN; AKKAN, AHMET GÖKHANPublication Metadata only Effect of Three PDEIs on Neuroprotective and Autophagy Proteins in vitro AD Model(2021-01-01T00:00:00Z) Saygisever-Faikoglu, Kubra; Faikoglu, Gokhan; Celik, Hande; Ugur, Sedat Askin; AKKAN, Ahmet Gökhan; Kelicen-Ugur, Pelin; Ozyazgan, Sibel; AKKAN, AHMET GÖKHANBackground and Objective: The effects of PDEIs on neuroprotective SIRT1 and SESN2, on the autophagy-related proteins, are unknown but neuroprotective enzymes (sirtuins and sestrins) with autophagy genes are involved in the pathogenesis of Alzheimer-s disease. In this study, we aimed to elucidate the effect of three PDE Inhibitors (PDEIs) as autophagy enhancers and provide insights into their neuroprotective effects. Materials and Methods: HT-22 cells were exposed to A$ 25-35 with or without PDEIs for 32 hrs. qRT-PCR was performed for SIRT1, SESN2, ATG5 and BECN1 genes. Western blot analysis was performed for neuroprotective SIRT1, SESN2 proteins and autophagy proteins such as p-mTOR/mTOR, p-AMPK/AMPK and LC3. Results: A$ 25-35 exposure decreased SIRT1, ATG5 and BECN1 expression, while PDEIs prevented these genes from the A$ 25-35 induced decrease. Increased SESN2 gene expression by A$ 25-35 exposure was decreased by PDEIs treatment. Western blot experiment has also shown that SIRT1, p-AMPK and autophagy marker LC3II were decreased, whereas SESN2 and p-mTOR were elevated in the A$ 25-35 exposed HT-22 cells. Co administration of three PDEIs with A$ 25-35 recovered SIRT1, p-AMPK and LC3II decline and compensated SESN2 increase by elevating SIRT1, p-AMPK and LC3II expression and decreasing p-mTOR expression. Conclusion: The present study revealed the significant neuroprotective and autophagy stimulating potential of three PDEIs in A$-induced in vitro AD model. SIRT1 is a novel candidate for determining new, safe and effective treatment strategies and PDEI-mediated SIRT1 increase may advocate autophagy activation through different autophagy components.Publication Metadata only Temel ve Klinik Farmakoloji - Katzung Yayım Tarihi5/2021(2021-09-01T00:00:00Z) Yıllar, Dündar Okan; Akkan, Ahmet Gökhan; AKKAN, AHMET GÖKHANPublication Metadata only Delta(9)-tetrahydrocannabinol treatment improved endothelium-dependent relaxation on streptozotocin/nicotinamide-induced diabetic rat aorta(2015-03-01T00:00:00Z) Altinok, A.; Coskun, Z. M.; Karaoglu, K.; BOLKENT, Şehnaz; Akkan, Ahmet Gökhan; Ozyazgan, S.; AKKAN, AHMET GÖKHANObjective: In this study, we investigated the possible effect of Delta(9)-tetrahydrocannabinol (THC), a peroxisome proliferator-activated receptor gamma (PPAR.) agonist, on metabolic control and vascular complications of diabetes in streptozotocin/nicotinamide (STZ/NIC) induced type 2 diabetes mellitus. Material and methods: Type 2 diabetes was induced with 65 mg/kg STZ, 15 minute later 85 mg/kg NIC was given intraperitoneally (i.p.) to rats. Three days after diabetes induction, THC (3 mg/kg/day, i.p.) was given for 7 days to diabetic rats. Body weight and plasma glucose levels of rats were measured in all groups before and at the end of 3 weeks after diabetes induction. Acetylcholine (Ach) and sodium nitroprusside (SNP) potency and maximum relaxant effects were calculated on aortic rings pre-contracted with noradrenaline (NA). Results: At the end of 3 weeks, blood glucose levels of diabetic group significantly increased in comparison with the control group. Increased plasma glucose levels were significantly decreased by the treatment of THC. Ach induced relaxation was impaired whereas endothelium-independent relaxation to SNP was unaffected on isolated diabetic rat aorta. THC treatment enhanced Ach induced relaxation on diabetic rat aortas. Discussion: These results suggested that THC improved endothelium-dependent relaxation in STZ/NIC induced diabetic rat aorta and that these effects were mediated at least in part, by control of hyperglycemia and enhanced endothelial nitric oxide bioavailability.Publication Metadata only Temel ve Klinik Farmakoloji - Katzung Yayım Tarihi5/2021(2021-09-01T00:00:00Z) Akkan, Ahmet Gökhan; Bukharı, Andleeb; AKKAN, AHMET GÖKHAN