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Esra Emerce, Ismet Cok, Sibel Sari, Omur Bostanci
Hydrochlorothiazide is a widely used antihypertensive agent and one of its major impurities, salamide (4-amino-6-chlorobenzene-1,3-disulphonamide), has a chemical structure containing a primary amino group, a functional group that has previously been reported to be associated with carcinogenic activity. It is known that hydrochlorothiazide purity is a challenging problem for the pharmaceutical industry. As there were no prior mutagenicity data for the impurity salamide, the aim was to investigate its mutagenicity in this study...
November 2016: Toxicology Mechanisms and Methods
Esra Emerce, Ismet Cok, I Tuncer Degim
Impurities affecting safety, efficacy, and quality of pharmaceuticals are of increasing concern for regulatory agencies and pharmaceutical industries, since genotoxic impurities are understood to play important role in carcinogenesis. The study aimed to analyse impurities of montelukast chronically used in asthma theraphy and perform genotoxicological assessment considering regulatory approaches. Impurities (sulfoxide, cis-isomer, Michael adducts-I&II, methylketone, methylstyrene) were quantified using RP-HPLC analysis on commercial products available in Turkish market...
October 14, 2015: Toxicology Letters
Bensu Karahalil, Ela Kadioglu, Ayşegül M Tuzuner-Oncul, Emre Cimen, Esra Emerce, Reha S Kisnisci
The use of titanium and its alloys (Ti-6Al-4V) for oral surgery has increased dramatically in recent years. Ti is a stable biocompatible metal suitable for oral applications and it has been used for endosseous subperiosteal implants and miniplate fixation for more than 25 years. Dental implants are typically made of Ti or Ti alloys. The alloys are potentially toxic due to release of vanadium and aluminum. We tested the possible genotoxicity of Ti alloy endosseous implants and miniplates on the oral mucosal tissues of two groups of patients: 17 patients receiving Ti miniplate and screw fixation, and 37 endosseous dental implant placement patients...
January 15, 2014: Mutation Research. Genetic Toxicology and Environmental Mutagenesis
Rajendran C Gopalan, Esra Emerce, Colin W Wright, Bensu Karahalil, Ali E Karakaya, Diana Anderson
Malaria is a mosquito-borne infectious disease caused by the genus Plasmodium. It causes one million deaths per year in African children under the age of 5 years. There is an increasing development of resistance of malarial parasites to chloroquine and other currently used anti-malarial drugs. Some plant products such as the indoloquinoline alkaloid cryptolepine have been shown to have potent activity against P. falciparum in vitro. On account of its toxicity, cryptolepine is not suitable for use as an antimalarial drug but a number of analogues of cryptolepine have been synthesised in an attempt to find compounds that have reduced cytotoxicity and these have been investigated in the present study in human sperm and lymphocytes using the Comet assay...
December 15, 2011: Toxicology Letters
Bensu Karahalil, Elvin Kesimci, Esra Emerce, Tulin Gumus, Orhan Kanbak
Ischemia-reperfusion (I/R) injury, by inducing oxidative DNA damage, is one of the leading causes of increased patient morbidity and mortality in coronary artery by-pass grafting (CABG) surgery. 8-Hydroxyguanine (8-OHG) is an important oxidative base lesion. The 8-oxoguanine glycosylase (hOGG1) and hMTH1, which have several polymorphisms, remove 8-OHdG from the nucleotide pool. We investigated whether there are any correlations the biomarkers of oxidative stress (superoxide dismutase; SOD and 8-OHdG in serum) with genotype for two DNA repair genes (OGG1 and MTH1) and an antioxidant enzyme gene (manganese superoxide dismutase; MnSOD)...
April 2011: Molecular Biology Reports
Bensu Karahalil, Esra Emerce, Neslihan Aygün Kocabaş, Elif Akkaş
The presenting study was investigated the associations between individual susceptibility and cigarette smoke on maternal chromosomal damage and neonatal birth growth in smoking mothers since little known about genetic susceptibility to cigarette smoke in relation to adverse pregnancy outcome such as birth growth. Sixty-one pregnant women who completed a questionnaire at Ankara Education and Research Hospital, Department of Obstetrics and Gynecology have enrolled in this study. GSTM1 and OGG1 ser326Cys gene polymorphisms were analysed by RFLP-PCR (Restriction Fragment Length Polymorphism-Polymerase Chain Reaction) as possible genetic factors affecting susceptibility to such health effects of smoking and chromosomal damage was performed by chromosomal aberration assay (CAA) in maternal blood lymphocytes...
June 2011: Molecular Biology Reports
Bensu Karahalil, Tulin Gumus, Esra Emerce, Seval Izdes, Orhan Kanbak, Elvin Kesimci
Ischaemia-reperfusion (I/R) injury is responsible for a number of conditions such as coronary bypass and myocardial infarction, and deaths. Oxygen-free radicals formed during I/R have been proposed as the leading causes of tissue injury, and they play an important role in I/R injury. I/R induces oxidative DNA damage (such as purinic and pyrimidinic base lesions). Comet assay is a suitable and sensitive method for early detection of low-level DNA damage. We used modified alkaline comet assay in peripheral blood lymphocytes and evaluated I/R-induced DNA damage in patients undergoing coronary artery bypass graft (CABG) operation (in vivo model for I/R)...
September 2009: Arhiv za Higijenu Rada i Toksikologiju
Bensu Karahalil, Esra Emerce, Bülent Koçer, Serdar Han, Necati Alkiş, Ali Esat Karakaya
High incidence and poor prognosis of lung cancer make it a major health problem worldwide. Although smoking is a major cause of lung cancer, only some smokers develop lung cancer, which suggests that there is a genetic predisposition in some individuals. 8-OHG is an important oxidative base lesion and may elevate due to cancer and smoking. It is repaired by 8-hydroxyguanine DNA glycosylase 1 (OGG1), which has several polymorphisms. Although the Ser326Cys polymorphism is consistently associated with a range of cancers, findings about this polymorphism and lung cancer risk are contradictory...
December 2008: Arhiv za Higijenu Rada i Toksikologiju
B Karahalil, E Coskun, E Emerce
Adrenoceptors (ARs) consist of nine subtypes, which are involved in a wide spectrum of physiological functions and are the site of action for a considerable percentage of currently prescribed therapeutics. All AR subtypes (except alpha(1D)) can be polymorphic because of the genetic variations in the coding and non-coding regions. Sixteen sequence variations were identified in alpha-adrenergic 2A (ADRA2A) gene. Among them, ADRA2A C1291G polymorphism is one of the most important polymorphisms, which plays a major role in regulating neurotransmitter release, blood pressure, lipolysis, insulin secretion, and platelet aggregation...
April 2008: Toxicology and Industrial Health
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