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ugur sahin

Malwina Strenkowska, Renata Grzela, Maciej Majewski, Katarzyna Wnek, Joanna Kowalska, Maciej Lukaszewicz, Joanna Zuberek, Edward Darzynkiewicz, Andreas N Kuhn, Ugur Sahin, Jacek Jemielity
Along with a growing interest in mRNA-based gene therapies, efforts are increasingly focused on reaching the full translational potential of mRNA, as a major obstacle for in vivo applications is sufficient expression of exogenously delivered mRNA. One method to overcome this limitation is chemically modifying the 7-methylguanosine cap at the 5' end of mRNA (m(7)Gppp-RNA). We report a novel class of cap analogs designed as reagents for mRNA modification. The analogs carry a 1,2-dithiodiphosphate moiety at various positions along a tri- or tetraphosphate bridge, and thus are termed 2S analogs...
November 16, 2016: Nucleic Acids Research
Andac Salman, Yaman Sonmez, Hulya Sahin, Ali Ugur Unal, Haner Direskeneli, Leyla Cinel, Tulin Ergun
No abstract text is available yet for this article.
November 12, 2016: Dermatologic Therapy
Ugur Sahin, Pinar Ataca Atilla, Erden Atilla, Selami Kocak Toprak, Taner Demirer
Thrombotic episodes are far less common than bleeding complications after hematopoietic stem cell transplantation (HSCT). However, they lead to significant morbidity and mortality. These complications are classified into four groups, including venous thromboembolic events (VTE), catheter-induced thrombosis (CIT), transplant-associated thrombotic microangiopathy (TA-TMA) and sinusoidal obstruction syndrome (SOS) or veno-occlusive disease (VOD). The frequency of VTE is increased among patients undergoing HSCT due to some acquired conditions including underlying malignancy, infections, administration of myeloablative conditioning regimens and/or total body irradiation, prolonged hospitalizations leading to immobility and presence of central venous catheters...
November 2016: Critical Reviews in Oncology/hematology
Mustafa Diken, Lena M Kranz, Sebastian Kreiter, Ugur Sahin
mRNA vaccines are finally ready to assume their rightful place at the forefront of nucleic acid- based vaccines. Major achievements within the last two decades have turned this highly versatile molecule into a safe and very attractive pharmaceutical platform that combines many positive attributes able to address a broad range of diseases, including cancer. The simplicity of mRNA vaccines greatly reduces complications generally associated with the production of biological vaccines. Intrinsic costimulatory and inflammatory triggers in addition to the provision of the antigenic information makes mRNA an all- in-one molecule that does not need additional adjuvants and that does not pose the risk of genomic integration...
November 1, 2016: Current Issues in Molecular Biology
Ari Waisman, Nadine Hövelmeyer, Andreas Diefenbach, Detlef Schuppan, Mathhias J Reddehase, Hartmut Kleinert, Bernd Kaina, Stephan Grabbe, Peter R Galle, Matthias Theobald, Frauke Zipp, Ugur Sahin, Öslem Türeci, Sebastian Kreiter, Peter Langguth, Heinz Decker, Ger van Zandbergen, Hansjörg Schild
No abstract text is available yet for this article.
October 2016: Cellular Immunology
Semih Baghaki, Murat Diyarbakirlioglu, Ugur Sahin, Muge Anil Kucuksucu, Akif Turna, Bilgi Baca, Yağmur Aydın
Besides conventional flaps, intercostal artery perforator flaps have been reported to cover trunk defects. In this report the use of anterior intercostal artery perforator (AICAP) flap, lateral intercostal artery perforator (LICAP) flap and dorsal intercostal artery perforator (DICAP) flap for thoracic, abdominal, cervical, lumbar and sacral defects with larger dimensions and extended indications beyond the reported literature were reevaluated. Thirty-nine patients underwent surgery between August 2012 and August 2014...
October 5, 2016: Microsurgery
Stephan Grabbe, Heinrich Haas, Mustafa Diken, Lena M Kranz, Peter Langguth, Ugur Sahin
The development of nucleic acid based vaccines against cancer has gained considerable momentum through the advancement of modern sequencing technologies and on novel RNA-based synthetic drug formats, which can be readily adapted following identification of every patient's tumor-specific mutations. Furthermore, affordable and individual 'on demand' production of molecularly optimized vaccines should allow their application in large groups of patients. This has resulted in the therapeutic concept of an active personalized cancer vaccine, which has been brought into clinical testing...
October 2016: Nanomedicine
Kudret Aytemir, Adel Aminian, Serkan Asil, Uğur Canpolat, Ergün Barış Kaya, Levent Şahiner, Banu Evranos, Hikmet Yorgun, Necla Özer
No abstract text is available yet for this article.
November 15, 2016: International Journal of Cardiology
Hasan Sahin, Tuncer Simsek, Hakan Turkon, Yıldıray Kalkan, Faruk Ozkul, M Turgut Alper Ozkan, Mesut Erbas, Ugur Altinisik, Yavuz Demiraran
PURPOSE: To investigate the effects of preoperative rectal ozone insufflation on surgical wound healing over the proinflammatory cytokines and histopathological changes. METHODS: Twenty one rabbits were divided into 3 groups. Sham, surgical wound, and ozone applied (6 sessions, every other day 70 µg/mL in 12 mL O2-O3 mixture rectally) surgical wound groups were created. TNF-alpha and IL-6 levels from all rabbits were studied at the basal, 24th hour, and 72nd hour...
July 2016: Acta Cirúrgica Brasileira
Abderraouf Selmi, Fulvia Vascotto, Kordula Kautz-Neu, Özlem Türeci, Ugur Sahin, Esther von Stebut, Mustafa Diken, Sebastian Kreiter
Intradermal administration of antigen-encoding RNA has entered clinical testing for cancer vaccination. However, insight into the underlying mechanism of RNA uptake, translation and antigen presentation is still limited. Utilizing pharmacologically optimized naked RNA, the dose-response kinetics revealed a rise in reporter signal with increasing RNA amounts and a prolonged RNA translation of reporter protein up to 30 days after intradermal injection. Dendritic cells (DCs) in the dermis were shown to engulf RNA, and the signal arising from the reporter RNA was significantly diminished after DC depletion...
September 2016: Cancer Immunology, Immunotherapy: CII
Muhammed Üçüncü, Ceren Cantürk, Erman Karakuş, Hüseyin Zeybek, Uğur Bozkaya, Emine Soydaş, Ertan Şahin, Mustafa Emrullahoğlu
Drawing upon a consecutive amide coupling and intramolecular cyclisation pathway, a one-pot, straightforward synthetic route has been developed for a range of pyrazole fused γ-pyrone derivatives. The reaction mechanism proposed for the chemoselective formation of γ-pyranopyrazole is furthermore fully supported by experimental and computational studies.
August 21, 2016: Organic & Biomolecular Chemistry
Serkan Asil, Levent Şahiner, Necla Özer, E Barış Kaya, Banu Evranos, Uğur Canpolat, Hikmet Yorgun, Heves Karagöz, Kudret Aytemir
OBJECTIVES: Following the encouraging results of several registries and trials, transcatheter aortic valve implantation (TAVI) has been recognized as a valid option in patients with severe aortic stenosis deemed at high or prohibitive risk for surgical treatment. Good procedural success and good clinical outcomes have been showed and very limited data exist on TAVI in the setting of a preexisting mitral prosthesis regarding the technique, potential complications, and outcomes. METHODS: Here, we report six cases of transfemoral TAVI with a self-expanding bioprosthesis (CoreValve; Medtronic, Inc) in patients who had previously undergone mitral valve replacement...
October 15, 2016: International Journal of Cardiology
Mark Laible, Kornelia Schlombs, Katharina Kaiser, Elke Veltrup, Stefanie Herlein, Sotiris Lakis, Robert Stöhr, Sebastian Eidt, Arndt Hartmann, Ralph M Wirtz, Ugur Sahin
BACKGROUND: MammaTyper is a novel CE-marked in vitro diagnostic RT-qPCR assay which assigns routinely processed breast cancer specimens into the molecular subtypes Luminal A-like, Luminal B-like (HER2 positive or negative), HER2 positive (non-luminal) and Triple negative (ductal) according to the mRNA expression of ERBB2, ESR1, PGR and MKI67 and the St Gallen consensus surrogate clinical definition. Until now and regarding formalin-fixed, paraffin-embedded material (FFPE), this has been a task mostly accomplished by immunohistochemistry (IHC)...
2016: BMC Cancer
Tuncer Şimşek, Uğur Altınışık, İsmail Erşan, Hasan Şahin, Betül Altınışık, Mesut Erbaş, Çiğdem Pala
BACKGROUND: Oleuropein is known to have anti-oxidant and anti-inflammatory effects. An important aim of anesthetic management in ocular surgery is to keep the intraocular pressure under control. Studies have researched a variety of prophylactic materials used to prevent increases in intraocular pressure. We aimed to research the effects of oleuropein on intraocular pressure (IOP) during general anaesthesia. METHODS: Fourteen New Zealand rabbits were randomly divided into two groups of seven...
2016: SpringerPlus
Uğur Altınışık, Hatice Betül Altınışık, Tuncer Şimşek, Hasan Ali Kiraz, Tuğba Doğu, Hüseyin Toman, Hasan Şahin, Mesut Erbaş
OBJECTIVE: In this study, we aimed to discuss the level of knowledge and approach on 'maintenance, calibration and cleaning of anaesthesia devices' among anaesthesiologists in Turkey. METHODS: A questionnaire was prepared with 21 questions based on the Google document system, and these questionnaires were sent to the anaesthesiologists via e-mail. RESULTS: Overall, 226 anaesthesiologists answered our survey. With respect to the maintenance and calibration, anaesthesiologists had sufficient information about the vaporizer and the carbon dioxide canister devices; however, information about the vital components, such as disassembly of the anaesthesia machine, flow sensor, oxygen sensor, battery and exhaust system, was insufficient...
June 2016: Turkish Journal of Anaesthesiology and Reanimation
Ugur Sahin, Selami Kocak Toprak, Pinar Ataca Atilla, Erden Atilla, Taner Demirer
Infections are the most common and significant cause of mortality and morbidity after allogeneic hematopoietic stem cell transplantation (allo-HSCT). The presence of neutropenia and mucosal damage are the leading risk factors in the early pre-engraftment phase. In the early post-engraftment phase, graft versus host disease (GvHD) induced infection risk is increased in addition to catheter related infections. In the late phase, in which reconstitution of cellular and humoral immunity continues, as well as the pathogens seen during the early post-engraftment phase, varicella-zoster virus and encapsulated bacterial infections due to impaired opsonization are observed...
August 2016: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
Lena M Kranz, Mustafa Diken, Heinrich Haas, Sebastian Kreiter, Carmen Loquai, Kerstin C Reuter, Martin Meng, Daniel Fritz, Fulvia Vascotto, Hossam Hefesha, Christian Grunwitz, Mathias Vormehr, Yves Hüsemann, Abderraouf Selmi, Andreas N Kuhn, Janina Buck, Evelyna Derhovanessian, Richard Rae, Sebastian Attig, Jan Diekmann, Robert A Jabulowsky, Sandra Heesch, Jessica Hassel, Peter Langguth, Stephan Grabbe, Christoph Huber, Özlem Türeci, Ugur Sahin
Lymphoid organs, in which antigen presenting cells (APCs) are in close proximity to T cells, are the ideal microenvironment for efficient priming and amplification of T-cell responses. However, the systemic delivery of vaccine antigens into dendritic cells (DCs) is hampered by various technical challenges. Here we show that DCs can be targeted precisely and effectively in vivo using intravenously administered RNA-lipoplexes (RNA-LPX) based on well-known lipid carriers by optimally adjusting net charge, without the need for functionalization of particles with molecular ligands...
June 1, 2016: Nature
Mehmet Yaman, Uğur Arslan, Hasan Ali Gümrükçüoğlu, Musa Şahin, Hakkı Şimşek, Serkan Akdağ
BACKGROUND AND OBJECTIVES: Studies reveal that the microvolt T wave alternans (MTWA) test has a high negative predictive value for arrhythmic mortality among patients with ischemic or non-ischemic cardiomyopathy. In this study, we investigate the effects of trimetazidine treatment on MTWA and several echocardiographic parameters in patients with stable coronary artery disease. SUBJECTS AND METHODS: One hundred patients (23 females, mean age 55.6±9.2 years) with stable ischemic heart disease were included in the study group...
May 2016: Korean Circulation Journal
Garip Sahin, Gökhan Temiz, Sultan Ozkurt, Cengiz Bal, Ilter Bozaci, Canan Bayrak Torun, Olga Meltem Akay, Sema Uslu, Ahmet Ugur Yalcin, Zafer Gulbas, Haluk Kiper
OBJECTIVES: In chronic kidney disease, both bleeding and thrombotic complications are observed, although with expected recovery after a successful transplant. Adiponectin has protective properties with respect to atherogenesis and inflammation. Plasma adiponectin levels are markedly elevated among patients with end-stage renal disease and are lower after kidney transplant. However, this topic is still debated in the literature. Here, we evaluated the effect of transplant on platelet function markers (P-selectin and platelet aggregation) and adiponectin in renal transplant patients...
June 3, 2016: Experimental and Clinical Transplantation
Onder Limon, Erkan Sahin, Funda Ugur Kantar, Deniz Oray, Asli Aydinoglu Ugurhan
Acute pancreatitis can have a variable presentation and diagnosis is based on clinical presentation, serum amylase and lipase levels and computed tomography. Negative predictive value of serum lipase in diagnosing acute pancreatitis is approximately to 100 percent and a normal blood lipase level in acute pancreatitis is an extremely rare condition. Here we reported two cases with normal serum amylase and lipase levels.
March 2016: Turkish Journal of Emergency Medicine
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