42 results on '"Erzik, Can"'
Search Results
2. Radiation-induced oxidative injury of the ileum and colon is alleviated by glucagon-like peptide-1 and -2
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Deniz, Mustafa, Atasoy, Beste M., Dane, Faysal, Can, Güray, Erzik, Can, Çetinel, Şule, and Yeğen, Berrak Ç.
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- 2015
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3. Exosomes' profile in ankylosing spondylitis: A preliminary study
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ABACAR, KEREM YİĞİT, ATAGÜNDÜZ, MEHMET PAMİR, ERZİK, CAN, and Karakaya E., Deniz R., ABACAR K. Y., ATAGÜNDÜZ M. P., ERZİK C.
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Temel Tıp Bilimleri ,Medicine (miscellaneous) ,Assessment and Diagnosis ,Sağlık Bilimleri ,Temel Bilgi ve Beceriler ,Genel Tıp ,Fundamental Medical Sciences ,Pathophysiology ,Clinical Medicine (MED) ,TIP, GENEL & DAHİLİ ,Health Sciences ,ankylosing spondylitis ,Internal Medicine ,Klinik Tıp (MED) ,Aile Sağlığı ,MEDICINE, GENERAL & INTERNAL ,Dahiliye ,Patofizyoloji ,Klinik Tıp ,Fundamentals and Skills ,General Medicine ,CLINICAL MEDICINE ,Değerlendirme ve Teşhis ,Tıp ,Exosome ,cell surface markers ,General Health Professions ,Medicine ,Tıp (çeşitli) ,extracellular vesicle ,Family Practice ,Genel Sağlık Meslekleri - Abstract
Objective: Ankylosing spondylitis (AS) is a chronic systemic inflammatory disease that leads to structural and functional im-pairments and reduced quality of life, with heterogeneous manifestations. The origin and possible role of extracellular vesicles represented by exosomes (EVexo) in the pathogenesis of AS were examined in this study. Materials and Methods: Extracellular vesicles (EVs) were isolated from serum from ten AS patients and ten healthy controls through Izon qEV2/35 nm columns. After assessing the isolate purity by bicinchoninic acid assay (BCA) and Enzyme-Linked ImmunoSorbent Assay (ELISA), the relationship between EVexo concentration and AS was tested by the BCA method. The EVexo surface markers were analyzed by flow cytometry (FC) to verify EVexo presence and reveal its origin. Results: In FC analysis, CD86+TSG101+ and CD3+TSG101+ exosome percentages of AS group were significantly higher than the control group (p
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- 2023
4. Anti-inflammatory, antioxidant and neuroprotective effects of niacin on mild traumatic brain injury in rats
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Demir, Dilan, primary, Kuru Bektasoglu, Pinar, additional, Koyuncuoglu, Turkan, additional, Colakoglu Ozkaya, Seyma, additional, Karagoz Koroglu, Ayca, additional, Akakin, Dilek, additional, Erzik, Can, additional, Yuksel, Meral, additional, C. Yegen, Berrak, additional, and Gurer, Bora, additional
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- 2023
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5. Flavonoid ile Kombine Edilmiş Kemoterapi İlaçlarının Kolorektal Kanser Hücrelerine Etkisi
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AYDIN OMAY, BANU, ERZİK, CAN, ARĞA, KAZIM YALÇIN, CABADAK, HÜLYA, and Kanlı Z., Aydın Omay B., Erzik C., Arğa K. Y. , Cabadak H.
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Multidisipliner ,BİYOFİZİK ,Multidisciplinary ,MULTIDISCIPLINARY SCIENCES ,Temel Bilimler ,Biophysics ,Temel Bilimler (SCI) ,Life Sciences ,Doğa Bilimleri Genel ,Life Sciences (LIFE) ,ÇOK DİSİPLİNLİ BİLİMLER ,Biyofizik ,BIOLOGY & BIOCHEMISTRY ,NATURAL SCIENCES, GENERAL ,Yaşam Bilimleri (LIFE) ,Yaşam Bilimleri ,Natural Sciences (SCI) ,Biyoloji ve Biyokimya ,Natural Sciences - Published
- 2022
6. Rethinking large group lectures – how far in this format
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ERZİK, CAN, GÜLPINAR, MEHMET ALİ, YEGEN, BERRAK, and Akturan S., Erzik C., Yegen B., Gülpınar M. A.
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MEDICAL ETHICS ,Medical education ,Temel Tıp Bilimleri ,Integration ,Medicine (miscellaneous) ,Tıp Eğitimi ,Assessment and Diagnosis ,Sağlık Bilimleri ,Temel Bilgi ve Beceriler ,Genel Tıp ,Fundamental Medical Sciences ,Pathophysiology ,Clinical Medicine (MED) ,TIP, GENEL & DAHİLİ ,Health Sciences ,Internal Medicine ,Klinik Tıp (MED) ,Aile Sağlığı ,MEDICINE, GENERAL & INTERNAL ,TIBBİ ETİK ,Dahiliye ,Patofizyoloji ,Undergraduate ,Klinik Tıp ,Fundamentals and Skills ,General Medicine ,Teaching methods ,CLINICAL MEDICINE ,Değerlendirme ve Teşhis ,Tıp ,General Health Professions ,Lectures ,Medicine ,Tıp (çeşitli) ,Medicine Education ,Family Practice ,Genel Sağlık Meslekleri - Abstract
Objective: The aim of this study is to determine the perceptions, attitudes, and behaviour of medical students and lecturers regarding the lectures and their effects on students’ learning behaviour.Materials and Methods: This was a qualitative study including multi-methods. Researchers observed lecture ambiance and activities in two courses. Lectures were observed and slide-presentations were evaluated. Additionally, in-depth and focus group interviews were conducted.Results: Two researchers attended and observed 75 lectures. The average number of attendees was 51.21. Eighty percent of lecturers did not introduce any activities to attract attention and prepare students for the lecture. Only 12% of lectures were taught interactively. Of the evaluated 43 (69.80%) slide-presentations, sufficient association or integration was not made between clinical and basic sciences.Conclusion: This study revealed that the lectures created negative feelings and thoughts in students and lecturers, and led to undesirable attitudes and behaviour. It is essential to focus on giving interactive lectures which aim at developing reasoning, decisionmaking, and evaluation competencies. The most significant factors determining students’ attendance and appraisal of the lectures were related to the preparation of the lecturers, the intensity of the content, integration between basic science and clinical science, and the presentation skills.
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- 2022
7. Exosomes' Profile in Ankylosing Spondylitis: A Preliminary Study.
- Author
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Karakaya, Emel, Deniz, Rabia, Abacar, Kerem Yiğit, Atagündüz, Mehmet Pamir, and Erzik, Can
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ANKYLOSING spondylitis ,EXOSOMES ,EXTRACELLULAR vesicles ,ENZYME-linked immunosorbent assay ,T cells - Abstract
Objective: Ankylosing spondylitis (AS) is a chronic systemic inflammatory disease that leads to structural and functional impairments and reduced quality of life, with heterogeneous manifestations. The origin and possible role of extracellular vesicles represented by exosomes (EVexo) in the pathogenesis of AS were examined in this study. Materials and Methods: Extracellular vesicles (EVs) were isolated from serum from ten AS patients and ten healthy controls through Izon qEV2/35 nm columns. After assessing the isolate purity by bicinchoninic acid assay (BCA) and Enzyme-Linked ImmunoSorbent Assay (ELISA), the relationship between EVexo concentration and AS was tested by the BCA method. The EVexo surface markers were analyzed by flow cytometry (FC) to verify EVexo presence and reveal its origin. Results: In FC analysis, CD86+TSG101+ and CD3+TSG101+ exosome percentages of AS group were significantly higher than the control group (p<0.05). A significant difference was found between the AS and control groups in terms of CD3+IL17+ and CD3+IFNg+ and CD86+TNFα+ and CD86+IL12(p35)+ exosome percentages (p<0.01). Conclusion: The exosomes whose ratio increased in the AS process were derived from T cells expressing increased levels of IL-17A and IFNg in their membranes, and macrophages expressing increased levels of TNFα and IL-12(p35) in their membranes. The EVexo profile did not change according to the AS course. [ABSTRACT FROM AUTHOR]
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- 2023
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8. The Repertoire of Glycan Alterations and Glycoproteins in Human Cancers
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Kori, Medi, primary, Aydin, Busra, additional, Gulfidan, Gizem, additional, Beklen, Hande, additional, Kelesoglu, Nurdan, additional, Caliskan Iscan, Ayşegul, additional, Turanli, Beste, additional, Erzik, Can, additional, Karademir, Betul, additional, and Arga, Kazim Yalcin, additional
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- 2021
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9. Su1610 PHOENIXIN-14 ALLEVIATES HEPATIC ISCHEMIA/REPERFUSION INJURY IN RATS
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Sen, Semiha L., Özocak, Aysegül B., Akin, Elif, Çakil, Aslihan, Aritürk, Leman Arslan, Uyanik, Baris, Ercan, Feriha, Yuksel, Meral, Eyuboglu, Irem Peker, Erzik, Can, Yegen, Cumhur, and Yegen, Berrak C.
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- 2023
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10. Su1609 ELABELA PROTECTS AGAINST HEPATIC ISCHEMIA/REPERFUSION INJURY AND ALLEVIATES OXIDATIVE DAMAGE IN DISTANT ORGANS
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Özocak, Aysegül B., Sen, Semiha L., Aritürk, Leman Arslan, Yuksel, Meral, Eyuboglu, Irem Peker, Erzik, Can, Özkeçeci, Nur, Ercan, Feriha, Atici, Ali E., and Yegen, Berrak C.
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- 2023
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11. Road for understanding cancer stem cells: model cell lines
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Serakinci, Nedime and Erzik, Can
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- 2007
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12. Protective effects of spironolactone against hepatic ischemia/reperfusion injury in rats
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Atalay, Süleyman, primary, Soylu, Belkıs, additional, Aykaç, Aslı, additional, Velioğlu Öğünç, Ayliz, additional, Çetinel, Şule, additional, Özkan, Naziye, additional, Erzik, Can, additional, and Şehirli, Ahmet Özer, additional
- Published
- 2019
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13. Oestrogen receptor ERα and ERβ agonists ameliorate oxidative brain injury and improve memory dysfunction in rats with an epileptic seizure
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Koyuncuoğlu, Türkan, primary, Arabacı Tamer, Sevil, additional, Erzik, Can, additional, Karagöz, Ayça, additional, Akakın, Dilek, additional, Yüksel, Meral, additional, and Yeğen, Berrak Ç., additional
- Published
- 2019
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14. Analyses of copy number variations in myxopapillary ependymomas of cauda equina
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Ozen, Ali, primary, Bayrakli, Fatih, additional, Sonmez, Ozcan, additional, Peker Eyuboglu, Irem, additional, Erdogan, Onur, additional, Erzik, Can, additional, Yakicier, Mustafa Cengiz, additional, and Uyar Bozkurt, Suheyla, additional
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- 2019
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15. BARDET-BIEDL SYNDROME
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EROL, Nurdan, TÜRKMEN, Aysu, ÖZGÜNER, Ahmet, YAVRUCU, Serpil, ERZİK, Can, and ÖZER, Kürşat
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congenital, hereditary, and neonatal diseases and abnormalities ,nervous system diseases - Abstract
A 3,5-year-old boy was admitted with febrile convulsion and bronchitis. He had polydactyly, obesity, and micropenis on his physical examination which indicated the Bardet Biedl syndrome. Then further investigations were made to make the definitive diagnosis, in the light of literature. We would like to present this case report.Key Words: Bardet Biedl syndrome, Obesity, Retinitis pigmentosa, Hypogonadism, Mental retardation, Polydactyly.
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- 2016
16. RETROSPECTIVE EVALUATION OF HENOCH SCHONLEIN PURPURA CASES
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EROL, Nurdan, TÜRKMEN, Aysu, ERZİK, Can, ÖZGÜNER, Ahmet, and YAVRUCU, Serpil
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Objective: Henoch Schonlein Purpura (HSP) is the most common benign vasculitis occurring during childhood. Morbidity and mortality rates rise when there is organ system involvement. We aimed to retrospectively evaluate HSP cases in our clinic according to organ involvement, clinical and laboratory findings.Material and Methods: Twenty-eight HSP cases were followed in our clinic from January 1st 1997 to June 1st 2000. The cases were retrospectively evaluated.Results: The mean age of the patients was 7.96 years (interval: 3-14 yrs.). 17 of them were males, 11 were females. The mean hospitalization period was 6,36 days (interval: 1- 16 days). Two patients had been hospitalized twice due to recurrence and two others had each been hospitalized once before in another clinic due to the same disease. 9 patients (32.1 %) had a history of an upper respiratory tract infection (URTI) of whom 3 (10.7 %) had positive throat cultures for beta hemolytic streptococcus. Skin lesions were seen in all patients. Arthritis/arthralgia developed in 12 (42.9 %) patients. Gastrointestinal system tract (GIT)involvement developed in 19 patients (67.9 %), 7 (25 %) of them presented with abdominal pain and vomiting, 12 (42.9 %) with occult fetal blood. In 4 patients (14.3 %) with GIT involvement, hematochezia and melena developed later. Abdominal ultrasonography was performed on 17 cases (60.7 %). No surgical intervention was required for any of the patients. 11 patients (39,3 %) had renal involvement. In 8 of the cases (28,6 %) renal disease presented with microscopic hematuria with or without proteinuria and in the other 3 (10,7 %) with macroscopic hematuria. In 1 (3.6 %) case acute renal failure developed and hemodialysis was performed. Central nervous system (CNS) involvement occurred in one patient (3,6 %) who had convulsions. In 2 cases (7.1%) scrotal involvement was observed. 13 patients were given steroids.Conclusions: In HSP cases, renal and GIT involvement should be searched for meticulously and patients with renal involvement should be followed up regularly.Key Words: Henoch Schonlein Purpura, HSP nephritis, Vasculitis, Gastrointestinal bleeding.
- Published
- 2016
17. Sıçanlarda kolite bağlı hasarı nikotin antioksidatif aktivitesi ile hafifletir
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ÖZDEMİR, Zarife Nigar, TAZEGÜL, Gökhan, KURU, Pınar, BİLGİN, Şeyda, MENTEŞE, Semih Tiber, ERZIK, Can, SIRVANCI, Serap, and YEGEN, Berrak C
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Ulseratif kolit,Anksiyete,Miyeloperoksidaz,Superoksit dismutaz,Glutatyon,Katalaz ,Ulcerative colitis,Anxiety,Myeloperoxidase,Superoxide dismutase,Glutathione,Catalase - Abstract
Objective: Previous studies have demonstrated a higher incidence of ulcerative colitis in non-smokers. We investigated the beneficial effects of nicotine treatment on colitis-induced anxiety and oxidative colonic damage on rats.Materials and Methods: Wistar Albino (250-300 g) rats (n=40) were randomly divided into 5 groups as saline-treated colitis group, nicotine pre-treated colitis group, nicotine post-treated colitis group, continuously nicotine-treated colitis group and control group. Groups received intraperitoneal injections of saline or nicotine (0.1 mg/kg/day) for 15 days prior to and for 3 days following the colitis induction. Malondialdehyde (MDA) and glutathione (GSH) levels, myeloperoxidase (MPO), superoxide dismutase (SOD) and catalase (CAT) activities, histological evaluation and DNA fragmentation were studied in colonic samples. Anxiety levels were evaluated with the hole-board test. Results were evaluated using ANOVA and Mann-Whitney-U tests. Results: The saline-treated colitis group had increased MPO and MDA levels, DNA fragmentation and histological damage scores when compared with the control group. In the nicotinetreated groups MPO and MDA levels and DNA fragmentation were reduced, with lower histologic damage scores. Reduced SOD, CAT and GSH levels were also increased in nicotine-treated groups. Conclusion: This study demonstrates antioxidant effects of nicotine treatment in the acetic acid-induced colitis model including an increased antioxidant capacity, reduced migration of neutrophils to the inflamed colon and a reduction of membrane damage., Amaç: Epidemiyolojik çalışmalar ülseratif kolitin sigara kullanmayanlarda daha sık görüldüğünü bildirmektedir. Bu çalışmada kolitle oluşan oksidan hasar ve anksiyete üzerine nikotin ön tedavisinin ve/veya kolit sonrası tedavinin olası yararlı etkilerinin araştırılması amaçlanmıştır. Gereç ve Yöntem: Wistar Albino (250-300 g) sıçanlar (n=40), serum fizyolojik (SF) verilen, ön-tedavili, tedavili ve ön-tedavi+ tedavili kolit grubu ve kontrol grubu olmak üzere beşe ayrıldı. Kolit öncesi 15 gün ve kolit sonrasında 3 gün sıçanlara intraperitoneal SF ya da nikotin (0,1 mg/kg/gün) uygulandı. Kolon örneklerinde oksidan hasarı belirlemek için malondialdehid (MDA), miyeloperoksidaz (MPO) aktivitesi, glutatyon (GSH), süperoksit dismutaz (SOD), katalaz ve DNA fragmantasyonu ölçümleri ile histolojik skorlama yapıldı. Delikli kutu testi ile anksiyete seviyeleri belirlendi. Sonuçlar ANOVA ve Mann Whitney U testi ile analiz edildi. Bulgular: Kolitte artan anksiyetenin nikotin ile değişmediği gözlendi. SF verilen kolit grubunda kolon MPO ve MDA düzeyleri ile DNA fragmantasyonunun ve hasar skorunun kontrol grubuna kıyasla arttığı, nikotin verilen tüm kolit gruplarında ise bu hasar göstergelerinin anlamlı şekilde düştüğü gözlendi. Histolojik doku hasarı skorunun nikotin uygulanan kolit grubunda daha az olduğu gözlendi. SOD, katalaz ve GSH düzeylerindeki azalmanın nikotin tedavisiyle anlamlı şekilde arttığı gözlendi. Sonuç: Çalışmada asetik asitle oluşturulan kolit modelinde, nikotin tedavisinin doku antioksidan kapasitesini arttırarak, inflamasyon sonucu nötrofil göçünü ve membran hasarını azaltarak antioksidan etki oluşturduğu gösterildi.
- Published
- 2015
18. Association of ERAP1, IL23R and PTGER4 Polymorphisms with Radiographic Severity of Ankylosing Spondylitis
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Ozen, Gulsen, primary, Deniz, Rabia, additional, Eren, Fatih, additional, Erzik, Can, additional, Unal, Ali Ugur, additional, Yavuz, Sule, additional, Aydin, Sibel Zehra, additional, Inanc, Nevsun, additional, Direskeneli, Haner, additional, and Atagunduz, Pamir, additional
- Published
- 2017
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19. Nesfatin-1 alleviates extrahepatic cholestatic damage of liver in rats
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Solmaz, Ali, primary, Gülçiçek, Osman Bilgin, additional, Erçetin, Candaş, additional, Yiğitbaş, Hakan, additional, Yavuz, Erkan, additional, Arıcı, Sinan, additional, Erzik, Can, additional, Zengi, Oğuzhan, additional, Demirtürk, Pelin, additional, Çelik, Atilla, additional, and Çelebi, Fatih, additional
- Published
- 2016
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20. Determination of attitudes and behaviours in relation to active aging in individuals aged over 60 who are living in nursing homes
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KURU, Pinar, KELLECI, Yusuf, GULSAYAR, Gokhan, ARMAGAN, Muhammet Emin, and ERZIK, Can
- Subjects
Medicine ,Yaşlı sağlığı,Depresyon,Egzersiz,Aktif yaşlanma ,Elderly health,Depression,Exercise,Active aging ,Tıp - Abstract
Amaç: Yaşlanmayla beraber açığa çıkan sağlık sorunlarınınbelirlenmesi birey ve toplum sağlığı açısından oldukça önemlidir.Çalışmamızda amaç, katılımcıların; beslenme, fiziksel ve sosyalaktivite gibi günlük alışkanlıklarının ve sağlıkla ilişkilidavranışlarının ve kronik sağlık sorunlarının belirlenmesidir.Hastalar ve Yöntem: Araştırma kesitsel tiptedir. Çalışmayafarklı huzurevi ve bakımevlerinde yaşayan, akıl sağlığı yerinde 60yaş üstü 175 kişi katılmıştır. Yüz yüze görüşmeyle yapılan minimental testin ardından çalışmanın anketi, geriatrik depresyon vegünlük temel yaşam aktiviteleri (aktivitelerinde başkasına bağımlıolma) ölçekleri uygulanmıştır.Bulgular: Katılımcıların 85 (%48,6)‘i erkekti. Tümkatılımcıların %42,3’ü hayatları boyunca düzenli olarak hiçfiziksel egzersiz yapmamıştı. Günlük yaşam aktivitelerindebağımsız olanlarda düzenli fiziksel egzersiz yapma sıklığı dahafazla idi (p=0,005). Beden kitle indeksi arttıkça depresyon(p=0,012) ve bağımlılığın (p=0,010) arttığı tesbit edildi. Sürekliilaç kullananlarda depresyon, sürekli ilaç kullanmayanlara göreoldukça fazla idi (p=0,002). Katılımcıların çalışma yılları arttıkçabağımlılıklarının, istatistiksel anlamlılık olmaksızın azaldığıgözlenmiştir.Sonuç: Fiziksel egzersiz ve aktif çalışma hayatı ile ileridekiyaşlarda başka bir kişiye bağımlı olarak yaşama arasında tersorantılı ilişki saptanmıştır. Kronik sağlık sorunu nedeniyle ilaçkullanan bireylerde depresyon görülme sıklığı yüksekbulunmuştur. Beden kitle endeksinin artması ile depresyon vebağımlılık arasında doğru orantılı ilişki vardır., Aim: As the population ages, it is important to recognize the healthproblems of the elderly in relation to individual and public healthissues. Our aim was to determine the daily habits and health-relatedbehaviours of an aging population concerning factors such asnutritional status, physical and social activity levels and chronichealth problems.Patients and Methods: This is a cross-sectional study. Thestudy included 175 participants over 60 years of age that werementally healthy and living in different nursing homes. A minimental test, a study questionnaire, a geriatric depression scale andan activities of daily living (ADL, physically dependent on others)scale were applied to the participants face to face.Results: Eighty-five (48.6%) of the participants were male.42.3% of the participants did not do any regular physical exercise intheir life time. The frequency of regular physical exercise washigher in the physically non-dependent to others (p=0.005) group inthe ADL scale. Depression and ADL scores increased withincreasing body mass index (BMI) (p= 0.012 and p= 0.010,respectively). In continuous medication users depression is quitehigh when compared to those who do not use medication constantly(p= 0.002). With increasing working years, there was a tendency toa decrease in scores of the physically dependent on others group inADL.Conclusion: Regular physical exercise and an active work historyboth have a negative correlation on dependency in ADL in later years.Depression is more common among individuals who are onmedication due to chronic health problems. A greater BMI was relatedto a higher frequency of depression and to dependency in ADL. 
- Published
- 2014
21. Meme kanserinde insulin benzeri büyüme faktörü bağlayan protein-5 geni promotor ve ekzon-1 metilasyonunun gen ekspresyonu üzerine etkisi
- Author
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PEKER EYÜBOĞLU, İREM, ERZİK, CAN, AKKİPRİK, MUSTAFA, and KARABULUT UZUNÇAKMAK S., KAYA Z., GÜLLÜ AMURAN G., PEKER EYÜBOĞLU İ., ÖZMEN T., ERZİK C., ÖZER S. A., AKKİPRİK M.
- Abstract
İnsulin benzeri büyüme faktörü (İGF-)-bağlayan protein-5 (İGFBP5), meme kanserinde hücre farklılaşması, metastaz, apoptoz, hücre büyümesi gibi biyolojik süreçlerde önemli fonksiyonlara sahip bir büyüme faktörüdür. DNA metilasyonu gibi epigenetik mekanizmalar gen ekspreyonu regülasyonunda önemli rol oynamaktadırlar. Bu çalışmanın amacı insan meme kanseri ve onların sağlıklı dokularında İGFBP5 geni promotor ve ekzon-1 bölgelerinin metilasyon düzeyini belirlemek ve bunun İGFBP5 ekspresyonuna etkisini ortaya çıkarmaktır. Çalışma 35 meme kanseri hastasından alınan 70 örnek (tümör ve komşu sağlıklı dokular) ile gerçekleştirildi. DNA metilasyon durumlarını ortaya çıkarmak için metilasyon spesifik PZR (MSP), metilasyonun ekspresyon üzerine etkisini belirlemek için ise gerçek zamanlı PZR (real time-PCR) tercih edildi. IGFBP5 ekspresyon analizi yapılan 14 örnekten üçünde DNA metilasyonu ile mRNA ekspresyonu arasında bir ilişki saptanmıştır. Bu örneklerden ilkinde kanserli dokuda promotor bölgesinin ve ikinci örnekte ekzon bölgesinin metilasyonunun azalması, sağlıklı dokuya oranla gen ekspresyonunu arttırmış, üçüncü örnekte ise yine kanserli dokuda artan ekzon metilasyonu mRNA ekspresyonunun azalmasına sebep olmuştur. Araştırılan 35 örneğin 11’nde kanserli ve sağlıklı doku arasında promotor ve ekzon bölge metilasyon kalıplarının farklı olduğu, diğerlerinde ise sağlıklı doku ve kanserli dokunun nerdeyse aynı metilasyon kalıbına sahip olduğu görülmüştür. İGFBP5 geni hem kanserli hem de sağlıklı dokuda ekzon bölgesi için çoğunlukla metillenmemiş, promotor bölgesi için çoğunlukla metile bantlar vermiştir. Elde edilen veriler ışığında İGFBP5 geni exon-1 ve promotor bölge metilasyon kalıplarının gen expresyonu üzerine etkili olduğu düşünülmektedir. İGFBP5 geni ekspresyon analiz çalışmaları devam etmektedir.
- Published
- 2013
22. Protective effects of St. John's wort in the hepatic ischemia/reperfusion injury in rats.
- Author
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Atalay, Süleyman, Soylu, Belkıs, Aykaç, Aslı, Öğünç, Ayliz Velioğlu, Çetinel, Şule, Özkan, Naziye, Erzik, Can, and Şehirli, Ahmet Özer
- Subjects
ISCHEMIA ,REPERFUSION injury ,NEUTROPHILS ,OXIDATIVE stress ,CELL death - Abstract
Objectives: The purpose of this study was to investigate possible protective effects of St. John's wort in the hepatic ischemia/reperfusion injury. Material and Methods: The hepatic artery, portal vein, and bile duct were all clamped for 45 minutes to induce ischemia in rats, and after that reperfusion for 1 hour. SJW was administrated orally, once a day for 3 days before ischemia/reperfusion. The aspartate aminotransferase, alanine aminotransferase, tumor necrosis factor, and interleukin levels were measured in the serum samples. Luminol chemiluminescence, lucigenin luminol chemiluminescence levels; myeloperoxidase. The sodium-potassium ATPase (Na+/K+ ATPase) activity was determined in the liver tissue, and caspase-3 and caspase-9 activity with the bcl-2/bax ratio were measured by the western blot analysis. Results: The St. John's wort administration recovered the aspartate aminotransferase, alanine aminotransferase, tumor necrosis factor, and IL-1ß levels serum parameters meaningfully, while ischemia/reperfusion caused an increase in luminol chemiluminescence, lucigenin luminol chemiluminescence, myeloperoxidase, caspase-3, and caspase-9 activity and led to a decrease in the B-cell lymphoma-2/bcl-2-associated X protein (bcl-2/bax) ratio and the Na+/K+ ATPase activity. Conclusion: The obtained results indicate protective effects of St. John's wort on the ischemia/reperfusion injury through various mechanisms, and we are able to suggest that St. John's wort can clinically create a new therapeutic principle. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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23. Clinical significance of miR-140-5p and miR-193b expression in patients with breast cancer and relationship to IGFBP5
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Güllü, Gökçe, primary, Peker, Irem, additional, Haholu, Aptullah, additional, Eren, Fatih, additional, Küçükodaci, Zafer, additional, Güleç, Bülent, additional, Baloglu, Hüseyin, additional, Erzik, Can, additional, Özer, Ayse, additional, and Akkiprik, Mustafa, additional
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- 2015
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24. The incidence and interpretation of factor V A4070G, methylenetetrahydrofolate reductase A1298C, and plasminogen activator inhibitor-1 4G/5G mutation rates in women with complicated pregnancies of unknown etiology
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Erzik, Can, Çırakoğlu, Beyazıt, Tıbbi Biyoloji ve Genetik Anabilim Dalı, and Tıbbi Biyoloji Anabilim Dalı
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Genetik ,Medical Biology ,Tıbbi Biyoloji - Abstract
1. ÖZET Tromboz yatkınlığı, kalıtımla ya da sonradan edinilen etkenlere bağlı olarak gelişen bir bozukluktur. Edinsel etkenlere maruz kalmanın önlenebilirliği ve patofizyolojinin açıklanmasında, çoğu zaman, tek bir grup etkenin yeterli olmaması, özellikle kalıtsal tromboz yatkınlığı ile araştırmaların ön plana çıkmasına neden olmuştur. Gebeliğe bağlı, nedeni açıklanamayan hipertansiyon, preeklampsi, eklampsi, intrauterin gelişme geriliği, intrauterin fötus ölümü, plasenta dekolmanı gibi gebelikle ilişkili komplikasyonlar, anne ve fotus ölüm nedenlerinin önemli bir bölümünü oluşturmaktadır. Bu komplikasyonların gelişiminde endotel işlev bozukluğu, vazokonstriksiyon, plasenta iskemisi ve pıhtılaşma artışının rol oynadığı, bu etkenlerin uterusla plasenta arasındaki dolaşımın yetmezliğine yol açtığı gösterilmiştir. Tromboza yol açan kalıtsal etkenlerden pıhtılaşma ve fibrin yıkım düzeneklerinde yer alan moleküllere ait kusurlar, gebelikle ilişkili bu bozukluklarda araştırılmaktadır. Bu çalışmada, tromboza yatkınlığı arttırdığı düşünülen kalıtsal etkenlerden, pıhtılaşma düzeneği içinde yer alan faktör V, metionin-homosistein döngüsünde görev yapan metilentetrahidrofolat redüktaz enzimi ve fibrin yıkımında düzenleyici görevi yapan plazminojen aktivatör inhibitörü-1 moleküllerine ilişkin kusurların, nedeni açıklanamayan komplikasyonlu ve sağlıklı gebelerdeki sıklığı, klinik ve demografik özelliklerle ilişkisi incelenmiştir. İlerleyen yıllarda, riskli gebeliklerin erken dönemlerinde, kalıtsal tromboz yatkınlığı etkenlerine yönelik koruyucu tedaviler uygulanmasının rutin hale gelebileceği öne sürülmektedir. Bu tip çalışmaların, bu konuya katkı yapması beklenmektedir. 2. SUMMARY The Incidence and Interpretation of Factor V A4070G, Methylenetetrahydrofolate Reductase A1298C, and Plasminogen Activator Inhibitor-1 4G/5G Mutation Rates In Women With Complicated Pregnancies of Unknown Etiology Thrombophilia is a disorder, developing due to acquired or heritable factors. The preventable feature of acquired factors and the inefficiency of solely a group of etiologic causes, raise the importance of reserach on heritable factors of thrombophilia. Pregnancy complications with an unknown cause like pregnancy-induced hypertension, pre-eclampsia / eclampsia, intrauterine foetal death, intrauterine growth retardation and abruptio placentae are the major causes of maternal and foetal morbidity and mortality. Endothelial dysfunction, vasoconstriction, plasental ischemia, and increased coagulation are shown to be associated with the development of these complications by leading to utero-placental insufficiency. The association of defects in coagulation and fibrinolysis are currently being investigated in pregnancy complications with an unknown cause. In this study, in women with healthy and complicated pregnancies, the incidence of the defects of factor V of the coagulation cascade, methylenetetrahydrofolate reductase enzyme in methionine-homocysteine cycle, and plasminogen activator inhibitor-1 in fibrinolysis regulation and their relation to the clinical findins have been analysed. Preventive measures against heritable thrombophilic causes can be applied in management of pregnancies under risk, in the future. Such studies are expected to have additive effect on the knowledge about the subject. 103
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- 2003
25. Ghrelin alleviates spinal cord injury in rats via its anti-inflammatory effects
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Ersahin, Mehmet, primary, Toklu, Hale Zerrin, additional, Erzik, Can, additional, Akakin, Dilek, additional, Tetik, Sermin, additional, Sener, Goksel, additional, and Yegen, Berrak Caglayan, additional
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- 2011
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26. The Anti-Inflammatory and Neuroprotective Effects of Ghrelin in Subarachnoid Hemorrhage-Induced Oxidative Brain Damage in Rats
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Erşahin, Mehmet, primary, Toklu, Hale Z., additional, Erzik, Can, additional, Çetinel, Şule, additional, Akakin, Dilek, additional, Velioğlu-Öğünç, Ayliz, additional, Tetik, Şermin, additional, Özdemir, Zarife N., additional, Şener, Göksel, additional, and Yeğen, Berrak Ç., additional
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- 2010
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27. Neuroprotective Effects of Alpha-Lipoic Acid in Experimental Spinal Cord Injury in Rats
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Toklu, Hale Z., primary, Hakan, Tayfun, additional, Celik, Hasan, additional, Biber, Necat, additional, Erzik, Can, additional, Ogunc, Ayliz V., additional, Akakin, Dilek, additional, Cikler, Esra, additional, Cetinel, Sule, additional, Ersahin, Mehmet, additional, and Sener, Goksel, additional
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- 2010
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28. S1634 Alpha-Lipoic Acid Improves Acetic Acid-Induced Gastric Ulcer Healing in Rats
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Karakoyun, Berna, primary, Yuksel, Meral, additional, Ercan, Feriha, additional, Erzik, Can, additional, and Yegen, Berrak C., additional
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- 2008
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29. T1292 Glucagon-Like Peptide-2 Protects Against Abdominopelvic Radiation-Induced Intestinal and Colonic Damage
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Deniz, Mustafa, primary, Can, Güray, additional, Atasoy, Beste M., additional, Dane, Faysal, additional, Erzik, Can, additional, Cetinel, Sule, additional, and Yegen, Berrak C., additional
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- 2008
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30. A mutation in a functional Sp1 binding site of the telomerase RNA gene (hTERC) promoter in a patient with Paroxysmal Nocturnal Haemoglobinuria.
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Keith, W. Nicol, Vulliamy, Tom, Jiangqin Zhao, Ar, Cem, Erzik, Can, Bilsland, Alan, Ulku, Birsen, Marrone, Anna, Mason, Philip J., Bessler, Monica, Serakinci, Nedime, and Dokal, Inderjeet
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GENETIC mutation ,BINDING sites ,RNA ,TELOMERASE ,PAROXYSMAL hemoglobinuria - Abstract
Background: Mutations in the gene coding for the RNA component of telomerase, hTERC, have been found in autosomal dominant dyskeratosis congenita (DC) and aplastic anemia. Paroxysmal nocturnal hemoglobinuria (PNH) is a clonal blood disorder associated with aplastic anemia and characterized by the presence of one or more clones of blood cells lacking glycosylphosphatidylinositol (GPI) anchored proteins due to a somatic mutation in the PIGA gene. Methods: We searched for mutations in DNA extracted from PNH patients by amplification of the hTERC gene and denaturing high performance liquid chromatography (dHPLC). After a mutation was found in a potential transcription factor binding site in one patient electrophoretic mobility shift assays were used to detect binding of transcription factors to that site. The effect of the mutation on the function of the promoter was tested by transient transfection constructs in which the promoter is used to drive a reporter gene. Results: Here we report the finding of a novel promoter mutation (-99C->G) in the hTERC gene in a patient with PNH. The mutation disrupts an Sp1 binding site and destroys its ability to bind Sp1. Transient transfection assays show that mutations in this hTERC site including C-99G cause either up- or down-regulation of promoter activity and suggest that the site regulates core promoter activity in a context dependent manner in cancer cells. Conclusions: These data are the first report of an hTERC promoter mutation from a patient sample which can modulate core promoter activity in vitro, raising the possibility that the mutation may affect the transcription of the gene in hematopoietic stem cells in vivo, and that dysregulation of telomerase may play a role in the development of bone marrow failure and the evolution of PNH clones. [ABSTRACT FROM AUTHOR]
- Published
- 2004
31. Examination of exosome profile in patients with ankylosing spondylitis
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Karakaya, Emel, Erzik, Can, Marmara Üniversitesi, Sağlık Bilimleri Enstitüsü, and Tıbbi Biyoloji ve Genetik Anabilim Dalı
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Eksozom ,Hücre dışı vezikül ,Ankilozan spondilit ,Cell surface markers ,Extracellular vesicle ,Hücre yüzeyi belirteçleri Exosome ,Ankylosing spondylitis - Abstract
Amaç: Bu çalışmada, hücre-hücre iletişiminin temel komponentleri olan eksozomların kronik, sistemik ve inflamatuvar bir hastalık olan ankilozan spondilit (AS) patogenezindeki olası rolü ve bu eksozomların kökeni araştırılmıştır.Gereç ve Yöntem: 10 AS hastası ve 10 sağlıklı kontrolden elde edilen serum içerisindeki eksozomlar, önce fiziksel özelliklerinden yararlanılarak Izon qEV2/35 nm kolonları ile, ardından biyokimyasal özelliklerinden yararlanılarak CD9, CD63 ve CD81 antikorlarıyla kaplı 3 µm çapındaki manyetik boncuklar ile izole edilmiştir. Filtratın saflığını değerlendirmek için BCA ve ELISA testleri yapılmıştır. Eksozom varlığını doğrulamak, eksozomların kökenini ve sitokin profilini ortaya çıkarmak için flow sitometri analizi ile eksozom yüzey belirteçleri karakterize edilmiştir. Eksozom konsantrasyonu ile ilgili flow sitometri bulgusunu desteklemek amacıyla, eksozom konsantrasyonu ile AS arasındaki ilişki BCA yöntemi ile test edilmiş ve sonuçlar karşılaştırılmıştır.Bulgular: Flow sitometri analizinde, AS grubunun CD86+TSG101+ ve CD3+TSG101+ eksozom yüzdeleri kontrol grubuna göre anlamlı derecede yüksekti (p
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- 2023
32. Protective effects of St. John’s wort in the hepatic ischemia/reperfusion injury in rats
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Süleyman Atalay, Ayliz Velioğlu Öğünç, Naziye Özkan, Aslı Aykaç, Şule Çetinel, Ahmet Ozer Sehirli, Belkıs Soylu, Can Erzik, Atalay, Suleyman, Soylu, Belkis, Aykac, Asli, Ogunc, Ayliz Velioglu, Cetinel, Sule, Ozkan, Naziye, Erzik, Can, and Sehirli, Ahmet Ozer
- Subjects
ATPase ,HEPATECTOMY ,Ischemia ,Apoptosis ,ISCHEMIA-REPERFUSION INJURY ,inflammatory ,Pharmacology ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,medicine ,St. John's wort ,Lucigenin ,biology ,Chemistry ,INDUCTION ,Interleukin ,medicine.disease ,ischemia/reperfusion ,MICE ,030220 oncology & carcinogenesis ,Myeloperoxidase ,biology.protein ,Original Article ,030211 gastroenterology & hepatology ,Tumor necrosis factor alpha ,Reperfusion injury - Abstract
Objectives: The purpose of this study was to investigate possible protective effects of St. John's wort in the hepatic ischemia/reperfusion injury. Material and Methods: The hepatic artery, portal vein, and bile duct were all clamped for 45 minutes to induce ischemia in rats, and after that reperfusion for 1 hour. SJW was administrated orally, once a day for 3 days before ischemia/reperfusion. The aspartate aminotransferase, alanine aminotransferase, tumor necrosis factor, and interleukin levels were measured in the serum samples. Luminol chemiluminescence, lucigenin luminol chemiluminescence levels; myeloperoxidase. The sodium-potassium ATPase (Na+/K+ ATPase) activity was determined in the liver tissue, and caspase-3 and caspase-9 activity with the bcl-2/bax ratio were measured by the western blot analysis. Results: The St. John's wort administration recovered the aspartate aminotransferase, alanine aminotransferase, tumor necrosis factor, and IL-1 beta levels serum parameters meaningfully, while ischemia/reperfusion caused an increase in luminol chemiluminescence, lucigenin luminol chemiluminescence, myeloperoxidase, caspase-3, and caspase-9 activity and led to a decrease in the B-cell lymphoma-2/bcl-2-associated X protein (bcl-2/bax) ratio and the Na+/K+ ATPase activity. Conclusion: The obtained results indicate protective effects of St. John's wort on the ischemia/reperfusion injury through various mechanisms, and we are able to suggest that St. John's wort can clinically create a new therapeutic principle.
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- 2018
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33. Protective effects of spironolactone against hepatic ischemia/reperfusion injury in rats
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Ayliz Velioğlu Öğünç, Şule Çetinel, Naziye Özkan, Belkıs Soylu, Ahmet Ozer Sehirli, Süleyman Atalay, Aslı Aykaç, Can Erzik, Atalay, Suleyman, Soylu, Belkis, Aykac, Asli, Ogunc, Ayliz Velioglu, Cetinel, Sule, Ozkan, Naziye, Erzik, Can, and Sehirli, Ahmet Ozer
- Subjects
malondialdehyde ,Antioxidant ,medicine.medical_treatment ,Ischemia ,Hepatic ischemia reperfusion ,ISCHEMIA-REPERFUSION INJURY ,Pharmacology ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,medicine ,glutathione ,biology ,business.industry ,Glutathione ,medicine.disease ,Malondialdehyde ,MELATONIN PROTECTS ,cytokines ,APOPTOSIS ,RECEPTORS ,spironolactone ,chemistry ,030220 oncology & carcinogenesis ,Myeloperoxidase ,biology.protein ,Spironolactone ,030211 gastroenterology & hepatology ,Original Article ,Liver function ,LIVER-INJURY ,business ,Reperfusion injury - Abstract
Objective: In the present study, it was aimed to study the antioxidant effects of spironolactone (SPL) to determine its possible protective effects in hepatic ischemia reperfusion injury. Material and Methods: Hepatic artery, portal vein, and bile duct of Wistar albino rats were clamped for 45 minutes under anesthesia to form an ischemia period. Then reperfusion was allowed and the rats were decapitated 60 minutes later. SPL (20 mg/kg, p.o.) or SF was orally administered for 30 minutes before ischemia. Rats in the control arm underwent sham surgery and were administered isotonic saline. Liver function was studied by measuring aspartate aminotransferase (AST), alanine aminotransferase (ALT), tumor necrosis factor-alpha (TNF-alpha), and interleukin 1beta (IL-1 beta) levels. Malondialdehyde (MDA), glutathione (GSH), luminol, and lucigenin levels, myeloperoxidase (MPO) and Na+-K+- ATPase enzyme activities were analyzed to study tissue injury under light microscope. Results: While IR increased AST, ALT, TNF-alpha, and IL-1 beta levels and MDA, luminol, and lusigenin levels and MPO activities, it caused a decrease in GSH levels and Na+K+-ATPase activity. Spironolactone administration significantly improved these values. Conclusion: Protective effects of SPL against ischemia/reperfusion injury via various mechanisms suggest that this agent may become a novel treatment agent in clinical practice.
- Published
- 2019
34. Radiation-induced oxidative injury of the ileum and colon is alleviated by glucagon-like peptide-1 and -2
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Beste M. Atasoy, Şule Çetinel, Mustafa Deniz, Berrak Ç. Yeğen, Can Erzik, Güray Can, Faysal Dane, BAİBÜ, Tıp Fakültesi, Dahili Tıp Bilimleri Bölümü, Can, Güray, Deniz, Mustafa, Atasoy, Beste M., Dane, Faysal, Can, Guray, Erzik, Can, Cetinel, Sule, and Yegen, Berrak C.
- Subjects
medicine.medical_specialty ,endocrine system ,Ileum ,Lipid peroxidation ,chemistry.chemical_compound ,Internal medicine ,medicine ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,Myeloperoxidase ,biology ,digestive, oral, and skin physiology ,Glutathione ,Malondialdehyde ,Glucagon-like peptide-1 ,medicine.anatomical_structure ,Endocrinology ,chemistry ,Apoptosis ,biology.protein ,DNA fragmentation ,lcsh:QC770-798 ,Radiation-enteritis ,GLP-1 ,GLP-2 - Abstract
WOS:000215712700012 Purpose: The present study was conducted to characterize the possible therapeutic effects of glucagon-like peptide (GLP)-1 and GLP-2 against oxidative damage in the ileum and colon of irradiated rats. Methods and materials: Sprague-Dawley rats of both sexes received either a single dose of GLP-1 (0.1 nmol/kg, intraperitoneally, ip; n = 6) 10 min before abdominal irradiation (IR) or two consecutive doses of GLP-2 (7 nmol/kg, ip; n = 6) at 30 and 10 min before IR, while another group was administered vehicle (n = 6) 10 min before IR. Control rats (n = 6) received vehicle treatment without IR. On the fourth day of IR, samples from ileum and colon were removed for histological analysis, for the determination of myeloperoxidase (MPO) activity, malondialdehyde (MDA) and glutathione (GSH) levels, as well as DNA fragmentation ratio, an index of apoptosis. Results: IR-induced oxidative injury in the colonic tissue of vehicle-treated rats, evidenced by elevated MDA levels and MPO activity, as well as depleted colonic GSH levels, was reversed by GLP-2, while GLP-1 reduced IR-induced elevations in colonic MDA levels. IR-induced injury with elevated ileal MDA levels was reduced by GLP-1, while replenishment in GSH was observed in GLP-2-treated rats. Conclusion: Current findings suggest that GLP-1 and GLP-2 appear to have protective roles in the irradiation-induced oxidative damage of the gut by inhibiting neutrophil infiltration and subsequent activation of inflammatory mediators that induce lipid peroxidation. Copyright (C) 2015, The Egyptian Society of Radiation Sciences and Applications. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.
- Published
- 2015
35. Nesfatin-1 alleviates extrahepatic cholestatic damage of liver in rats
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Sinan Arici, Oğuzhan Zengi, Candaş Erçetin, Pelin Demirtürk, Erkan Yavuz, Ali Solmaz, Atilla Çelik, Can Erzik, Osman Bilgin Gülçiçek, Fatih Çelebi, Hakan Yigitbas, Solmaz, Ali, Gulcicek, Osman Bilgin, Ercetin, Candas, Yigitbas, Hakan, Yavuz, Erkan, Arici, Sinan, Erzik, Can, Zengi, Oguzhan, Demirturk, Pelin, Celik, Atilla, and Celebi, Fatih
- Subjects
0301 basic medicine ,Male ,Necrosis ,DNA fragmentation ,medicine.disease_cause ,HEPATOCYTES ,chemistry.chemical_compound ,ANTIOXIDANTS ,Edema ,Malondialdehyde ,oxidative stress ,hepatic damage ,lcsh:R5-920 ,biology ,Alanine Transaminase ,General Medicine ,LIPID-PEROXIDATION ,DNA-Binding Proteins ,medicine.anatomical_structure ,Liver ,Neutrophil Infiltration ,Cytokines ,medicine.symptom ,lcsh:Medicine (General) ,Research Article ,MELATONIN ,medicine.medical_specialty ,Obstructive jaundice ,DNA damage ,Nerve Tissue Proteins ,MECHANISMS ,03 medical and health sciences ,Cholestasis ,Internal medicine ,DEOXYRIBONUCLEIC-ACID ,INJURY ,medicine ,Animals ,Nucleobindins ,Aspartate Aminotransferases ,Rats, Wistar ,business.industry ,Calcium-Binding Proteins ,BILE-DUCT OBSTRUCTION ,medicine.disease ,Small intestine ,Rats ,030104 developmental biology ,Endocrinology ,Alanine transaminase ,chemistry ,JAUNDICE ,biology.protein ,business ,cholestasis ,Oxidative stress ,DNA Damage - Abstract
Obstructive jaundice (OJ) can be defined as cessation of bile flow into the small intestine due to benign or malignant changes. Nesfatin-1, recently discovered anorexigenic peptide derived from nucleobindin-2 in hypothalamic nuclei, was shown to have anti-inflammatory and antiapoptotic effects. This study is aimed to investigate the therapeutic effects of nesfatin-1 on OJ in rats. Twenty-four adult male Wistar-Hannover rats were randomly assigned to three groups: sham (n = 8), control (n = 8), and nesfatin (n = 8). After bile duct ligation, the study groups were treated with saline or nesfatin-1, for 10 days. Afterward, blood and liver tissue samples were obtained for biochemical analyses, measurement of cytokines, determination of the oxidative DNA damage, DNA fragmentation, and histopathologic analyses. Alanine aminotransferase and gamma-glutamyl transferase levels were decreased after the nesfatin treatment; however, these drops were statistically non-significant compared to control group (p = 0.345, p = 0.114). Malondialdehyde levels decreased significantly in nesfatin group compared to control group (p = 0.032). Decreases in interleukin-6 and tumor necrosis factor-α levels from the liver tissue samples were not statistically significant in nesfatin group compared to control group. The level of oxidative DNA damage was lower in nesfatin group, however this result was not statistically significant (p = 0.75). DNA fragmentation results of all groups were similar. Histopathological examination revealed that there was less neutrophil infiltration, edema, bile duct proliferation, hepatocyte necrosis, basement membrane damage, and parenchymal necrosis in nesfatin compared to control group. The nesfatin-1 treatment could alleviate cholestatic liver damage caused by OJ due to its anti-inflammatory and antioxidant effects.
- Published
- 2016
36. Spondi̇loartropati̇leri̇n geneti̇k ve epi̇geneti̇k yaklaşimla i̇ncelenmesi̇: Anki̇lozan spondi̇li̇tte epi̇geneti̇k modi̇fi̇ye edi̇ci̇leri̇n ekspresyonu
- Author
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Çolakoğlu, Şeyma, Erzik, Can, Tıbbi Biyoloji ve Genetik Anabilim Dalı, and Tıbbi Biyoloji Anabilim Dalı
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Spondylitis-ankylosing ,Rheumatic diseases ,Tıbbi biyoloji ,Autoimmune diseases ,Genetics ,Arthropathy ,Genetik ,Medical Biology ,Tıbbi Biyoloji ,Spondylitis - Abstract
1.ÖZETSpondiloartropati (SpA) hastalık grubunda yer alan Ankilozan spondilit (AS); başlıca enflamatuvar sırt ağrısı, asimetrik periferal oligoartrit, entezit ile tanımlanmış, diğer çok etkenli hastalıklar gibi, ortaya çıkışı genetik ve çevresel etkenlerle tetiklenen romatizmal otoimmün bir hastalıktır. Geçtiğimiz yıllar içinde insan ve diğer organizma genomlarının dizilenmesiyle varyasyonların incelenmesi, birçok hastalıkta olduğu gibi, AS hastalığının da genetik temelinin anlaşılması konusunda anlamlı mesafe kaydedilmesine imkan sağlamıştır.Genetik temelin yanı sıra epigenetik değişikliklerin de fizyolojik süreçlerde olduğu kadar, hastalık gelişiminde de önemli olduğu bilinmektedir. Epigenetik değişiklikler, DNA dizisindeki değişimlerle açıklanamayan gen ifadesindeki kalıtsal değişiklikler olarak tanımlanır. Başlıca epigenetik değişiklikler; DNA metillenmesi, histon ve kromatin yapı değişiklikleri ve kodlamayan RNA havuzundan oluşur. Yapılan çalışmalarda, epigenetik özellikleri etkileyen moleküllerin ifade edilmesinde ortaya çıkan değişikliklerin artirit gelişimi ve romatoid artiritin patogeneziyle ilişkisi olduğu rapor edilmiştir.Bu çalışmada AS tanısı almış diskordant monozigotik ikizler ile hastalığın radyolojik skorlamasına göre ağır ve hafif grup olarak klinikte tanımlanan iki gruba dahil edilmiş hastalarda epigenetik yapıyı düzenleyen (DNA metilaz, histon metilaz, kromatin şekillendiriciler gibi) genlerin ekspresyonları analiz edilmiştir. Analiz sonucunda NEK6, PRMT6, KDM6B, AURKA, CARM1, SETD1B, SETDB1, PRMT1, DNMT1, PRMT3, SETD7, MBD3, HDAC1, KDM4A, MLL, SUV420H1, NCOA3, KAT2B, SMYD3, RPS6KA5 genlerinin ekspresyonlarında görünen gruplar arası farklılık, anılan genlerin daha yüksek sayıda hasta gruplarında ekspresyon açısıdan incelenerek, doğrulanması gerektiğini ortaya koymuştur. Anahtar Kelimeler: Spondiloartropati , Ankilozan Spondilit, Epigenetik, Epigenetik Modifiye Edici1.SUMMARYAnkylosing spondylitis (AS), which is a member of multifactorial autoinflammatory Spondyloarthropathies, is defined by inflammatory dorsal pain, asymmetric peripheral oligoarthritis, enthesitis.The analysis of variations by DNA sequencing in human and other organisms has enabled a significant progress in understanding of the genetic basis of AS and many other diseases. Beside genetical basic, epigenetic changes are also considered as important tools for physiological processes and disease development. Major epigenetic changes can be classified as DNA methylation, histone modifications, chromatin remodelling and non-coding RNA effects. Studies so far are indicating that expression changes of molecules involved in epigenetic modifications might have a role in development of arthritis and pathogenesis of rheumatoid arthritis.In this study the expression of so called “epigenetic modifiers” like DNA methylase, histon methylase, chromatin remodeller complex has been analysed in a discordant monozygotic twin couple for AS and AS patients that have been classified as “fast progressing” and slow progressing according to radiographic scoring. The differential expression in NEK6, PRMT6, KDM6B, AURKA, CARM1, SETD1B, SETDB1, PRMT1, DNMT1, PRMT3, SETD7, MBD3, HDAC1, KDM4A, MLL, SUV420H1, NCOA3, KAT2B, SMYD3, RPS6KA5 genes should be validated in the same patient groups with larger number of subjects. Key Words: Spondyloarthropathy, Ankylosing Spondylitis, Epigenetic, Epigenetic Modifier
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- 2015
37. Neuroprotective Effects of Alpha-Lipoic Acid in Experimental Spinal Cord Injury in Rats
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Hale Z. Toklu, Necat Biber, Can Erzik, Hasan Hüseyin Çelik, Şule Çetinel, Ayliz Velioğlu Öğünç, Tayfun Hakan, Dilek Akakin, Mehmet Erşahin, Göksel Şener, Esra Çikler, Toklu, Hale Z., Hakan, Tayfun, Celik, Hasan, Biber, Necat, Erzik, Can, Ogunc, Ayliz V., Akakin, Dilek, Cikler, Esra, Cetinel, Sule, Ersahin, Mehmet, and Sener, Goksel
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Male ,METHYLPREDNISOLONE ,medicine.medical_treatment ,Original Contributions ,DIHYDROLIPOIC ACID ,ISCHEMIA-REPERFUSION INJURY ,medicine.disease_cause ,Antioxidants ,Lipid peroxidation ,PROTECTS ,chemistry.chemical_compound ,0302 clinical medicine ,Malondialdehyde ,ANTIOXIDANT ,GLUTATHIONE ,Medicine ,030212 general & internal medicine ,OXIDATIVE STRESS ,Spinal cord injury ,Neurologic Examination ,biology ,Thioctic Acid ,Neuroprotection ,medicine.anatomical_structure ,Neuroprotective Agents ,Anesthesia ,Myeloperoxidase ,medicine.medical_specialty ,Alpha-lipoic acid ,Intraperitoneal injection ,TRAUMATIC BRAIN-INJURY ,030209 endocrinology & metabolism ,DNA Fragmentation ,Trauma ,03 medical and health sciences ,Internal medicine ,Spinal cord injuries ,Animals ,Rats, Wistar ,Peroxidase ,Analysis of Variance ,business.industry ,medicine.disease ,Spinal cord ,Rats ,Disease Models, Animal ,Endocrinology ,chemistry ,Glutathione, Myeloperoxidase ,Luminescent Measurements ,biology.protein ,DNA damage ,Neurology (clinical) ,Lipid Peroxidation ,business ,Reactive Oxygen Species ,Oxidative stress - Abstract
Background: Oxidative stress is a mediator of secondary injury to the spinal cord following trauma. Objective: To investigate the putative neuroprotective effect of a-lipoic acid (LA), a powerful antioxidant, in a rat model of spinal cord injury (SCI). Methods: Wistar albino rats were divided as control, vehicle-treated SCI, and LA-treated SCI groups. To induce SCI, a standard weight-drop method that induced a moderately severe injury (100 g/cm force) at T10 was used. Injured animals were given either 50 mg/kg LA or saline at 30 minutes postinjury by intraperitoneal injection. At 7 days postinjury, neurologic examination was performed, and rats were decapitated. Spinal cord samples were taken for histologic examination or determination of malondialdehyde (MDA) and glutathione (GSH) levels, myeloperoxidase (MPO) activity, and DNA fragmentation. Formation of reactive oxygen species in spinal cord tissue samples was monitored by using a chemiluminescence (CL) technique. Results: SCI caused a significant decrease in spinal cord GSH content, which was accompanied with significant increases in luminol CL and MDA levels, MPO activity, and DNA damage. Furthermore, LA treatment reversed all these biochemical parameters as well as SO-induced histopathologic alterations. Conversely, impairment of the neurologic function caused by SCI remained unchanged. Conclusion: The present study suggests that LA reduces SCI-induced oxidative stress and exerts neuroprotection by inhibiting lipid peroxidation, glutathione depletion, and DNA fragmentation.
- Published
- 2010
38. Hematolojik malignitelrede gadd45 epigenetik disregülasyonu
- Author
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Çavuşoğlu, Enise, Çavuşoğlu, Beyazıt, Erzik, Can, and Tıbbi Biyoloji Anabilim Dalı
- Subjects
Hücre Parçalanması ,Genetik ,Hücreler ,Sitoloji ,Tıbbi Biyoloji - Abstract
1.ÖZET: GADD45 gen ailesi hücrede DNA hasarına cevap oluşturulması ve hücre bölünmesinin durdurulması süreçlerinde etkili olan, nükleer proteinler GADD45α,β ve γ’ yı kodlar. Her üç GADD45 gen ailesi üyesi de MTK1 kinazı aktive ederek p38/c-jun-NH2-kinaz aktivasyonunu ve apoptozu indüklemektedir. Yapılan çalışmalarda GADD45γ’nın tümör hücrelerinin koloni oluşturmasını ve bölünmesini baskıladığı gösterilmiştir. Ayrıca birçok kanser türünde GADD45γ’nın metile durumda bulunduğu ve metilasyonun ekspresyonu baskıladığı gösterilmiştir. Yapılan çalışmanın amacı hematolojik malignitelerde GADD45γ promotorunun metilasyon durumunun belirlenmesi ve metilasyonun ekspresyona etkisinin saptanmasıdır. Bunun için hemotolojik malignite hücre soylarından ve 117 akut miyeloid lösemi (AML), 94 multipl miyelom (MM) teşhisi konmuş hastadan alınan kan ve kemik iliği örneklerinden DNA izolasyonu yapılmıştır. Bisülfit modifikasyonunun ardından örneklerle metilasyon spesifik polimeraz zincir reaksiyonu (MSP) yapılmıştır. Non-Hodgkin lenfoma hücre serileri L–428 ve L–1236, Burkitt lenfoma hücre serisi Raji hücrelerinde GADD45γ promotoru tamamiyle metillenmiş olduğu, AML hücre serileri GDM–1, HL–60, KG1a ve MM hücre serisi OPM–2 hücrelerinde ise kısmen metillenmiş olduğu görülmüştür. İncelenen AML hasta örneklerinde metilasyon saptanmazken 94 MM hasta örneğinden 8’inde metilasyon saptanmıştır. İstatistiksel hesaplamalar sonucunda metilasyon saptanan hastalarda ortalama kalsiyum düzeyinin metilasyon görülmeyenlere oranla daha yüksek olduğu görülmüştür. Ayrıca GADD45γ’nın metile durumda olduğu hastaların ortalama sağ kalım sürelerinin 13,7 ay, genin metillenmemiş olarak bulunduğu hastalarda ise bu sürenin 57,1 ay olduğu görülmüştür. Metilasyonun genin ekspresyonuna etkisinin belirlenmesi amacıyla hücre soyları DNA metiltransferaz (DNMT) inhibitörü DAC ile 96 saat boyunca inkübe edilmiş ve RT-PCR uygulanmıştır. GADD45γ promotorunun tamamiyle metillenmiş durumda bulunduğu L–1236 hücrelerinde DAC uygulaması sonrası genin ekspresyonunda değişiklik olmazken, Raji, L–428, HL–60, KG1a, OPM–2 hücrelerinde DAC uygulaması sonrası genin ekspresyonunda artış gözlemlenmiştir. Elde edilen bulgular hemotolojik malignitelerde GADD45γ geninin tümör tipine bağlı olarak epigenetik mekanizmalarla sessizleştirilebileceğini göstermiştir.Anahtar Kelimeler: GADD45 gen ailesi, GADD45 gamma, epigenetik, DNA metilasyonu, hematolojik malinite 1.SUMMARYEpigenetic dysregulation of GADD45 in hematologic malignanciesGADD45 gene family encodes the nuclear proteins, GADD45α, β and γ, which response to damage in DNA in a cell and stopping cell proliferation. It has been shown from the research conducted in recent years that GADD45γ suppresses the colony formation and proliferation of tumor cells.The purpose of this study is to determine the methylation state of GADD45γ promoter in hemotologic malignities and the effect of methylation on expression. Therefore, DNA isolation is performed on blood and bone marrow samples of 117 acute myeloid leukemia (AML), and 94 multiple myelom (MM) patients and hematologic malignency cell lines . After the bisulfide modification of DNA, methylation specific polymerase chain reaction (MSP) has been performed on the samples. It has been found that, in Hodgkin lymphoma cell lines L-428 and L-1236 and Burkitt lymphoma cell lines Raji, GADD45γ promoter was fully methylated. However in AML cell lines GDM-1, HL-60, KG1a and MM cell lines OPM-2 , GADD45γ promoter has been found to be partially methylated. No methylation was found in AML patient samples whereas 8 of of 94 MM patient samples show promoter methylation. The survival time of the patients with methylated GADD45γ is 13.7 months, whereas the survival time of the patients with unmethylated GADD45γ is 57.1 months. In order to understand the effect of methylation on the gene expression, the cell lines were treated with DNA methyltransferase inhibitor (DAC) for 96 hours and then real-time polymerase-chain reaction (RT-PCR) was performed. In L-1236 cells where GADD45γ promoter was fully methylated, there has been no change in gene expression after DAC treatment whereas in Raji, L-428, HL-60, KG1a and OPM-2 cells, an increase in gene expression has been observed after DAC treatment,. The findings of this study indicate that in hemotoligic malignancies, GADD45γ gene may be silenced in epigenetic mechanisms according to the type of tumor.Key Words: GADD45 gene family, GADD45 gamma, Epigenetic, DNA methylation, heamatological malignancy
- Published
- 2009
39. Toward Precision Oncology in Glioblastoma with a Personalized Cancer Genome Reporting Tool and Genetic Changes Identified by Whole Exome Sequencing.
- Author
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Erdogan O, Özkaya ŞÇ, Erzik C, Bilguvar K, Arga KY, and Bayraklı F
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- Humans, Exome Sequencing, Precision Medicine, DNA Copy Number Variations genetics, Phosphatidylinositol 3-Kinases, Glioblastoma genetics
- Abstract
Precision/personalized medicine in oncology has two key pillars: molecular profiling of the tumors and personalized reporting of the results in ways that are clinically contextualized and triangulated. Moreover, neurosurgery as a field stands to benefit from precision/personalized medicine and new tools for reporting of the molecular findings. In this context, glioblastoma (GBM) is a highly aggressive brain tumor with limited treatment options and poor prognosis. Precision/personalized medicine has emerged as a promising approach for personalized therapy in GBM. In this study, we performed whole exome sequencing of tumor tissue samples from six newly diagnosed GBM patients and matched nontumor control samples. We report here the genetic alterations identified in the tumors, including single nucleotide variations, insertions or deletions (indels), and copy number variations, and attendant mutational signatures. Additionally, using a personalized cancer genome-reporting tool, we linked genomic information to potential therapeutic targets and treatment options for each patient. Our findings revealed heterogeneity in genetic alterations and identified targetable pathways, such as the PI3K/AKT/mTOR pathway. This study demonstrates the prospects of precision/personalized medicine in GBM specifically, and neurosurgical oncology more generally, including the potential for genomic profiling coupled with personalized cancer genome reporting. Further research and larger studies are warranted to validate these findings and advance the treatment options and outcomes for patients with GBM.
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- 2023
- Full Text
- View/download PDF
40. Anti-Inflammatory, Antioxidant and Neuroprotective Effects of Niacin on Mild Traumatic Brain Injury in Rats.
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Ozaydin D, Bektasoglu PK, Koyuncuoglu T, Ozkaya SC, Koroglu AK, Akakin D, Erzik C, Yuksel M, Yegen BC, and Gurer B
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- Rats, Animals, Antioxidants pharmacology, Antioxidants therapeutic use, Interleukin-10 therapeutic use, Rats, Wistar, Luminol therapeutic use, Anti-Inflammatory Agents pharmacology, Anti-Inflammatory Agents therapeutic use, Cytokines, Disease Models, Animal, Brain Concussion drug therapy, Brain Injuries pathology, Neuroprotective Agents pharmacology, Neuroprotective Agents therapeutic use, Niacin pharmacology, Niacin therapeutic use, Brain Injuries, Traumatic drug therapy, Brain Injuries, Traumatic pathology
- Abstract
Aim: To study the effects of niacin, a water-soluble vitamin, on inflammation, oxidative stress and apoptotic processes observed after mild traumatic brain injury (TBI)., Material and Methods: A total of 25 Wistar albino male rats were randomly divided into control (n=9), TBI + Placebo group (n=9), TBI + niacin (500 mg/kg; n=7) groups. Mild TBI was performed under anesthesia by dropping a 300 g weight from a height of 1 meter onto the skull. Behavioral tests were applied before and 24 hours after TBI. Luminol and lucigenin levels and tissue cytokine levels were measured. Histopathological damage was scored in brain tissue., Results: After mild TBI, luminol and lucigenin levels were increased (p < 0.001), and their levels were decreased with niacin treatment (p < 0.01-p < 0.001). An increased score was obtained with trauma in the tail suspension test (p < 0.01), showing depressive behavior. The number of entries to arms in Y-maze test were decreased in TBI group compared to pre-traumatic values (p < 0.01), while discrimination (p < 0.05) and recognition indices (p < 0.05) in object recognition test were decreased with trauma, but niacin treatment did not change the outcomes in behavioral tests. Levels of the anti-inflammatory cytokine IL-10 were decreased with trauma, and increased with niacin treatment (p < 0.05). The histological damage score was increased with trauma (p < 0.001), and decreased with niacin treatment in the cortex (p < 0.05), and hippocampal dentate gyrus region (p < 0.01)., Conclusion: Niacin treatment after mild TBI inhibited trauma-induced production of reactive oxygen derivatives and elevated the anti-inflammatory IL-10 level. Niacin treatment ameliorated the histopathologically evident damage.
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- 2023
- Full Text
- View/download PDF
41. The Repertoire of Glycan Alterations and Glycoproteins in Human Cancers.
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Kori M, Aydin B, Gulfidan G, Beklen H, Kelesoglu N, Caliskan Iscan A, Turanli B, Erzik C, Karademir B, and Arga KY
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- Biomarkers metabolism, Glycoproteins genetics, Glycosylation, Humans, Precision Medicine, Glycomics methods, Glycoproteins metabolism, Polysaccharides metabolism
- Abstract
Cancer as the leading cause of death worldwide has many issues that still need to be addressed. Since the alterations on the glycan compositions or/and structures (i.e., glycosylation, sialylation, and fucosylation) are common features of tumorigenesis, glycomics becomes an emerging field examining the structure and function of glycans. In the past, cancer studies heavily relied on genomics and transcriptomics with relatively little exploration of the glycan alterations and glycoprotein biomarkers among individuals and populations. Since glycosylation of proteins increases their structural complexity by several orders of magnitude, glycome studies resulted in highly dynamic biomarkers that can be evaluated for cancer diagnosis, prognosis, and therapy. Glycome not only integrates our genetic background with past and present environmental factors but also offers a promise of more efficient patient stratification compared with genetic variations. Therefore, studying glycans holds great potential for better diagnostic markers as well as developing more efficient treatment strategies in human cancers. While recent developments in glycomics and associated technologies now offer new possibilities to achieve a high-throughput profiling of glycan diversity, we aim to give an overview of the current status of glycan research and the potential applications of the glycans in the scope of the personalized medicine strategies for cancer.
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- 2021
- Full Text
- View/download PDF
42. Analyses of Copy Number Variations in Myxopapillary Ependymomas of Cauda Equina.
- Author
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Ozen A, Bayrakli F, Sonmez O, Eyuboglu IP, Erdogan O, Erzik C, Yakicier MC, and Bozkurt SU
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- Adult, Cauda Equina pathology, Cohort Studies, DNA Copy Number Variations, Female, Humans, Male, Middle Aged, Ependymoma genetics, Spinal Cord Neoplasms genetics
- Abstract
Aim: To identify the copy number variations that are specific to myxopapillary ependymomas (MPEs) of the cauda equina., Material and Methods: The patient cohort included five patients who underwent resection of histologically confirmed MPEs. Tumor samples collected during surgery and stored in liquid nitrogen as well as corresponding blood samples collected were analyzed. Genomic DNA from the venous blood and tumor samples was obtained using standard techniques and hybridized to a Cytoscan 750K Array in accordance with the manufacturer’s introductions., Results: As a novel finding, amplification on chromosome 14q32.33 was detected in all tumor and blood samples, except one tumor sample. All tumor tissues also showed amplification on chromosomes 5, 7, 9, and 16., Conclusion: Although further studies with larger cohorts are required to identify genes involved in MPE tumorigenesis and to validate our results, these findings provide a basis for advanced molecular biological and genetic studies of MPEs.
- Published
- 2020
- Full Text
- View/download PDF
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