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Genotoxicity

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https://www.readbyqxmd.com/read/29161779/micronuclei-assay-in-exfoliated-buccal-cells-of-radiation-treated-oral-cancer-patients
#1
Gayathri Ramesh, Smriti Chaubey, Amrita Raj, Ravi Kumar Seth, Anuradha Katiyar, Amit Kumar
BACKGROUND: Micronuclei are suitable internal dosimeters for revealing tissue-specific genotoxic damage in individuals exposed to carcinogenic mixtures. Evaluation of radiation-induced cellular changes to predict radiosensitivity has invested many investigators since such changes were first found in biopsy material. AIM: The aim of the present study was to assess the relationship of with histopathological grade and number of radiation therapy sittings with the frequency of micronuclei and nuclear anomalies among oral cancer patients...
November 2017: Journal of Experimental Therapeutics & Oncology
https://www.readbyqxmd.com/read/29159661/safety-of-clomiphene-citrate-a-literature-review
#2
REVIEW
Serkan Yilmaz, Neslihan Yilmaz Sezer, İlknur Münevver Gönenç, Sibel Erkal İlhan, Ebru Yilmaz
Clomiphene citrate (CC) is a nonsteroidal compound and induces ovulation indirectly. The wide usage of the CC raises a question; is it safe or not? In the light of this question, this review aimed to highlight all researches and insights into the association between the use of CC and risk of genotoxicity, cytotoxicity, embryotoxicity, teratogenicity and risk of different cancer types. We conducted a MEDLINE/PubMed, Scopus, Web of Science, Google Scholar search. After a careful screening process of all authors, 32 of these articles were considered as appropriate, and reviewed...
November 20, 2017: Cytotechnology
https://www.readbyqxmd.com/read/29159324/dna-repair-after-oxidative-stress-current-challenges
#3
Bennett Van Houten, Gloria A Santa-Gonzalez, Mauricio Camargo
Reactive oxygen and nitrogen species damage cellular macromolecules including DNA. Cells have a robust base excision repair pathway to deal with this damage in both nuclear and mitochondrial genomes. However, mitochondria lack nucleotide excision repair. Evidence suggests that chronic oxidative stress can induce protective pathways lowering genotoxicity. Understanding oxidant injury to DNA and its repair is critical for our understanding the pathophysiology of a wide range of human disorders.
February 2018: Current Opinion in Toxicology
https://www.readbyqxmd.com/read/29159201/interactions-between-retroviruses-and-the-host-cell-genome
#4
REVIEW
Valentina Poletti, Fulvio Mavilio
Replication-defective retroviral vectors have been used for more than 25 years as a tool for efficient and stable insertion of therapeutic transgenes in human cells. Patients suffering from severe genetic diseases have been successfully treated by transplantation of autologous hematopoietic stem-progenitor cells (HSPCs) transduced with retroviral vectors, and the first of this class of therapies, Strimvelis, has recently received market authorization in Europe. Some clinical trials, however, resulted in severe adverse events caused by vector-induced proto-oncogene activation, which showed that retroviral vectors may retain a genotoxic potential associated to proviral integration in the human genome...
March 16, 2018: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/29159200/analyzing-the-genotoxicity-of-retroviral-vectors-in-hematopoietic-cell-gene-therapy
#5
REVIEW
Luca Biasco, Michael Rothe, Hildegard Büning, Axel Schambach
Retroviral vectors, including those derived from gammaretroviruses and lentiviruses, have found their way into the clinical arena and demonstrated remarkable efficacy for the treatment of immunodeficiencies, leukodystrophies, and globinopathies. Despite these successes, gene therapy unfortunately also has had to face severe adverse events in the form of leukemias and myelodysplastic syndromes, related to the semi-random vector integration into the host cell genome that caused deregulation of neighboring proto-oncogenes...
March 16, 2018: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/29158044/chemical-analysis-and-in-vitro-toxicological-evaluation-of-aerosol-from-a-novel-tobacco-vapor-product-a-comparison-with-cigarette-smoke
#6
Yasunori Takahashi, Yuki Kanemaru, Toshiro Fukushima, Kentaro Eguchi, Shinya Yoshida, Jacqueline Miller-Holt, Ian Jones
The recent rapid increase in the prevalence of emerging tobacco- and nicotine-containing products, such as e-cigarettes, is being driven in part by their reduced-risk potential compared to tobacco smoking. In this study, we examined emission levels for selected cigarette smoke constituents, so-called "Hoffmann analytes", and in vitro toxicity of aerosol from a novel tobacco vapor product (NTV). The NTV thermally vaporizes a nicotine-free carrier liquid to form an aerosol which then passes through tobacco, where it absorbs tobacco-derived flavors and nicotine...
November 17, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/29156531/heated-naringin-mitigate-the-genotoxicity-effect-of-mitomycin-c-in-balb-c-mice-through-enhancing-the-antioxidant-status
#7
Mouna Maatouk, Nadia Mustapha, Imen Mokdad-Bzeouich, Hind Chaaban, Irina Ioannou, Kamel Ghedira, Mohamed Ghoul, Leila Chekir-Ghedira
A major problem with cancer chemotherapy is its severe toxic effects on non-target tissues. Assessment of natural products for their protective effect against anticancer drugs induced toxicity is gaining importance in cancer biology. The aim of the present study was to evaluate the effect of native and thermal treated naringin on the protective effect against mitomycin C (MMC) induced genotoxicity. The genotoxicity in liver kidney and brain cells isolated from Balb/C mice were evaluated by performing the comet assay...
November 15, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29156489/an-adherent-mucus-layer-attenuates-the-genotoxic-effect-of-colibactin
#8
Christian Reuter, Mona Alzheimer, Heike Walles, Tobias A Oelschlaeger
The human gastrointestinal tract is a complex ecosystem in which epithelial cells and microorganisms of the intestinal microbiota live in symbiosis. Certain members of the microbiota, in particular Escherichia coli strains of the B2 phylotype, carry the polyketide synthase (pks)-island encoding the genotoxin colibactin. Colibactin is a non-ribosomal peptide (NRP) or polyketide (PK)-NRP hybrid of still unsolved structure, which induces DNA double strand breaks (DSBs) in eukaryotic cells. However, direct contact between live bacteria and host cell is required in order to elicit these genotoxic effects...
November 20, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/29156308/modulatory-effects-of-green-tea-extract-against-the-hepatotoxic-effects-of-4-nonylphenol-in-catfish-clarias-gariepinus
#9
A H Sayed, Hamdy A M Soliman
The antioxidant role of the green tea (Camellia sinensis) extract (GTE) was examined to remedy the toxic effects of (0.2mgl(-1)) 4-nonylphenol(4-NP). Biochemical parameters, antioxidant enzymes, liver lipid peroxidation (LPO), DNA fragmentation, and apoptosis as well as histopathology of liver of African catfish Clarias gariepinus were considered. Catfishes were divided into four groups: first group (control), second group (0.2mgl(-1) of 4-NP), third group (0.2mgl(-1)of 4-NP +100mg GTE l(-1)water), and fourth group (0...
November 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29155797/immunofluorescence-microscopy-of-%C3%AE-h2ax-and-53bp1-for-analyzing-the-formation-and-repair-of-dna-double-strand-breaks
#10
Henning D Popp, Susanne Brendel, Wolf-Karsten Hofmann, Alice Fabarius
DNA double-strand breaks (DSB) are serious DNA lesions. Analysis of the formation and repair of DSB is relevant in a broad spectrum of research areas including genome integrity, genotoxicity, radiation biology, aging, cancer, and drug development. In response to DSB, the histone H2AX is phosphorylated at Serine 139 in a region of several megabase pairs forming discrete nuclear foci detectable by immunofluorescence microscopy. In addition, 53BP1 (p53 binding protein 1) is another important DSB-responsive protein promoting repair of DSB by nonhomologous end-joining while preventing homologous recombination...
November 3, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29155394/label-free-and-dynamic-monitoring-of-cytotoxicity-to-the-blood-brain-barrier-cells-treated-with-nanometre-copper-oxide
#11
Duan Lian, Zhang Chonghua, Gu Wen, Zhang Hongwei, Bai Xuetao
A cytotoxicity study was conducted with a primary culture of the nervous system cells, including brain microvascular endothelial cells (BMECs) and astrocytes, which are important components of the blood-brain barrier. The real-time cell analysis (RTCA) was used to determine the cytotoxicity of copper-oxide nanoparticles (CuO NPs). The IC50 values of CuO NPs in astrocytes and BMECs were determined by the RTCA at different exposure times and were used as base values for further research. DNA damage after exposure to CuO NPs for 3 and 24 h was assessed using comet assay at the IC50 obtained from RTCA...
December 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29155207/cytotoxic-effect-of-the-serotonergic-drug-1-1-naphthyl-piperazine-against-melanoma-cells
#12
Ana Catarina Menezes, Manuela Carvalheiro, José Miguel P Ferreira de Oliveira, Andreia Ascenso, Helena Oliveira
1-(1-Naphthyl)piperazine (1-NPZ) is a serotonergic derivative of quipazine acting both as antagonist and agonist of different serotonin receptors, with promising results for the management of skin cancer. In this work, we studied the effect of 1-NPZ on human MNT-1 melanoma cells by evaluating its effects on cell viability, ability to form colonies, cell cycle dynamics, reactive oxygen species (ROS) production and apoptosis. Treatment of MNT-1 cells with 1-NPZ for 24h decreased cell viability and induced apoptosis in a dose-dependent manner...
November 16, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/29155087/capsaicin-reduces-genotoxicity-colonic-cell-proliferation-and-preneoplastic-lesions-induced-by-1-2-dimethylhydrazine-in-rats
#13
Brunno Felipe Ramos Caetano, Mariana Baptista Tablas, Natália Elias Ferreira Pereira, Nelci Antunes de Moura, Robson Francisco Carvalho, Maria Aparecida Marchesan Rodrigues, Luis Fernando Barbisan
Capsaicin (8-Methyl-N-vanillyl-(trans)-6-nonenamide) is the major pungent ingredient found in chili peppers consumed worldwide. Most reports on capsaicin potential carcinogenicity have yielded inconsistent findings. Some studies have shown that capsaicin exerts anti-proliferative and pro-apoptotic effects on different cancer cell lines, while others have reported an association between capsaicin at high doses with mutagenicity and carcinogenicity. Thus, this study aimed at assessing the effects of capsaicin administration on 1,2-dimethyl-hydrazine (DMH)-induced colon carcinogenesis in male Wistar rats...
November 15, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29155076/genotoxicity-and-28-day-oral-toxicity-studies-of-a-functional-food-mixture-containing-maltodextrin-white-kidney-bean-extract-mulberry-leaf-extract-and-niacin-bound-chromium-complex
#14
Cheng-Tien Wu, Chen-Yuan Chiu, Chun-Fa Huang, Fu-Chuo Peng, Shing-Hwa Liu
Steady-fiber granule (SFG) is a functional food mixture that is composed of four major ingredients, resistant maltodextrin, white kidney bean (Phaseolus vulgaris) extract, mulberry leaf (Morus alba L.) extract, and niacin-bound chromium complex. This study focused on determining the safety of SFG. Genotoxicity and 28-day oral toxicity were evaluated. SFG did not induce mutagenicity in the bacterial reverse mutation assay using five Salmonella typhimurium strains (TA98, TA100, TA102, TA1535, and TA1537) in the presence or absence of metabolic activation (S9 system)...
November 16, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/29154952/in-vitro-mechanisms-of-beauvericin-toxicity-a-review
#15
REVIEW
Beatriz Mallebrera, Alessandra Prosperini, Guillermina Font, Maria-Jose Ruiz
Beauvericin (BEA) is a mycotoxin produced by many species of fungus Fusarium and by Beauveria bassiana; BEA is a natural contaminant of cereals and cereals based products and possesses a wide variety of biological properties. The mechanism of action seems to be related to its ionophoric activity, that increases ion permeability in biological membranes. As a consequence, BEA causes cytotoxicity in several cell lines and is capable to produce oxidative stress at molecular level. Moreover, BEA is genotoxic (produces DNA fragmentation, chromosomal aberrations and micronucleus) and causes apoptosis with the involvement of mitochondrial pathway...
November 15, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29154797/caryophyllane-sesquiterpenes-inhibit-dna-damage-by-tobacco-smoke-in-bacterial-and-mammalian-cells
#16
Silvia Di Giacomo, Lorena Abete, Rossana Cocchiola, Gabriela Mazzanti, Margherita Eufemi, Antonella Di Sotto
In the present study, the ability of the natural sesquiterpene β-caryophyllene (CRY) and its metabolite β-caryophyllene oxide (CRYO) to inhibit the genotoxicity of a condensate of cigarette smoke (CSC) was evaluated both in bacterial and mammalian cells. Also, the inhibition of the CSCmediated STAT3 phosphorylation and intracellular oxidative stress was evaluated as potential chemopreventive mechanism. Under our experimental conditions, both the sesquiterpenes exhibited antimutagenic properties, being CRY the most potent compound...
November 14, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29154196/analysis-of-potential-genotoxic-impurities-in-rabeprazole-active-pharmaceutical-ingredient-via-liquid-chromatography-tandem-mass-spectrometry-following-quality-by-design-principles-for-method-development
#17
Katerina Iliou, Anđelija Malenović, Yannis L Loukas, Yannis Dotsikas
A novel Liquid Chromatography-tandem mass spectrometry (LC-MS/MS) method is presented for the quantitative determination of two potential genotoxic impurities (PGIs) in rabeprazole active pharmaceutical ingredient (API). In order to overcome the analytical challenges in the trace analysis of PGIs, a development procedure supported by Quality-by-Design (QbD) principles was evaluated. The efficient separation between rabeprazole and the two PGIs in the shortest analysis time was set as the defined analytical target profile (ATP) and to this purpose utilization of a switching valve allowed the flow to be sent to waste when rabeprazole was eluted...
November 12, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29151145/pendimethalin-induces-oxidative-stress-dna-damage-and-mitochondrial-dysfunction-to-trigger-apoptosis-in-human-lymphocytes-and-rat-bone-marrow-cells
#18
Sabiha M Ansari, Quaiser Saquib, Sabry M Attia, Eslam M Abdel-Salam, Hend A Alwathnani, Mohammad Faisal, Abdulrahman A Alatar, Abdulaziz A Al-Khedhairy, Javed Musarrat
Pendimethalin (PM) is a dinitroaniline herbicide extensively applied against the annual grasses and broad-leaved weeds. There is no report available on PM-induced low-dose genotoxicity in human primary cells and in vivo test models. Such data gap has prompted us to evaluate the genotoxic potential of PM in human lymphocytes and rats. PM selectively binds in the minor groove of DNA by forming covalent bonds with G and C nitrogenous bases, as well as with the ribose sugar. PM induces micronucleus formation (MN) in human lymphocytes, indicating its clastogenic potential...
November 18, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/29150881/genotoxicity-of-11-heavy-metals-detected-as-food-contaminants-in-two-human-cell-lines
#19
B Kopp, D Zalko, M Audebert
Heavy metals, such as arsenic (As), antimony (Sb), barium (Ba), cadmium (Cd), cobalt (Co), germanium (Ge), lead (Pb), nickel (Ni), tellurium (Te), and vanadium (V) are widely distributed in the environment and in the food chain. Human exposure to heavy metals through water and food has been reported by different international agencies. Although some of these heavy metals are essential elements for human growth and development, they may also be toxic at low concentrations due to indirect mechanisms. In this study, the genotoxic and cytotoxic properties of 15 different oxidation statuses of 11 different heavy metals were investigated using high-throughput screening (γH2AX assay) in two human cell lines (HepG2 and LS-174T) representative of target organs (liver and colon) for food contaminants...
November 18, 2017: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/29150876/toxicological-characterization-of-zno-nanoparticles-in-malignant-and-non-malignant-cells
#20
Helena Moratin, Agmal Scherzad, Thomas Gehrke, Pascal Ickrath, Katrin Radeloff, Norbert Kleinsasser, Stephan Hackenberg
The increasing usage of zinc oxide nanoparticles (ZnO-NPs) in industrial applications as well as in consumer products raises concern regarding their potential adverse effects to a greater extend. Numerous studies have demonstrated toxic properties of NPs, however there is still a lack of knowledge concerning the underlying mechanisms. This study was designed to systematically investigate cytotoxicity, apoptosis, cell cycle alterations, and genotoxicity induced by ZnO-NP. Moreover, it was an aim of the investigations to specify the diverse effects of nanoparticle exposure in malignant in comparison with non-malignant cells...
November 18, 2017: Environmental and Molecular Mutagenesis
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