Abstract:
:The aim of the present work was to investigate the possible interference of cytochalasin B (cyt B) with low concentration treatment with colchicine in the induction of chromosome/chromatid loss and micronuclei in human lymphocytes mitotically activated in vitro. Thus, cells from a single female donor were treated with colchicine (10 or 25 nM, from 24 h after PHA addition to fixation at 66 h) either in the presence or absence of cyt B. Single lagging chromosomes/chromatids were scored in bipolar ana-telophases and greater damage (disrupted and c-anaphases) was scored in cells at anaphase. Micronuclei were scored in the first 4000 nuclei observed in both cyt B-treated (in mononucleate and binucleate cells) and untreated cultures. With the same criterion, FISH analysis was performed on 2000 nuclei where chromosome 7 and 11 centromeric DNA probes were used in pairs. Our results showed that: (i) the frequency of laggards and of micronuclei increased with colchicine concentration but in the presence of cyt B there was a lower frequency of both (with a mean reduction of approximately 49%); (ii) FISH analysis showed a colchicine concentration-dependent increase in nuclei with three spots for chromosome 7; (iii) a colchicine concentration-dependent increase in tetraploid cells was observed. This increase was particularly remarkable (5-fold) in cells grown in the presence of cyt B compared with cyt B-untreated cells. The observed 'cyt B effects' can be explained if it is assumed that in cytokinesis-blocked cells there is a shorter distance between the poles. As a consequence: (i) laggards would be engulfed in the nearest daughter nucleus with a consequent lower induction of micronuclei; (ii) segregating sister chromatids in heavily impaired anaphases would not travel a sufficient distance to give rise to two daughter nuclei, leading to an increased frequency of polyploid nuclei.
journal_name
Mutagenesisjournal_title
Mutagenesisauthors
Minissi S,Gustavino B,Degrassi F,Tanzarella C,Rizzoni Mdoi
10.1093/mutage/14.1.43subject
Has Abstractpub_date
1999-01-01 00:00:00pages
43-9issue
1eissn
0267-8357issn
1464-3804journal_volume
14pub_type
杂志文章相关文献
MUTAGENESIS文献大全abstract::The mechanism responsible for the modification of mutagenicity by chlorophyllin has been investigated using mutagenic compounds with different mechanisms of action, including the monofunctional alkylating agents, N-methyl-N'-nitrosourea (MNU) and ethylmethanesulphonate (EMS); nitrosamines related to tobacco products, ...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/7.5.349
更新日期:1992-09-01 00:00:00
abstract::A transgenic mouse strain with a high copy number of rescuable lacZ sequences was evaluated for its effectiveness in detecting lacZ- mutations in selected tissues. Procarbazine, cyclophosphamide, ethylnitrosourea, 7,12-dimethylbenz[a]anthracene (DMBA), acrylamide and chlorambucil were tested following either single or...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/8.1.7
更新日期:1993-01-01 00:00:00
abstract::Ionising radiation induces several isolated and clustered DNA lesions in human cells. Depending on the type of lesions, DNA repair pathways get activated to maintain the integrity of the genome. Base excision repair (BER) pathway is known to repair single-strand breaks and base damages through short- and long-patch ge...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/geu065
更新日期:2015-03-01 00:00:00
abstract::Sanfetrinem cilexetil, a hexetil ester of a Trinem antibiotic, does not induce micronuclei in rat bone marrow cells or induce DNA repair synthesis in rat hepatocytes following oral dosing. However, in vitro chromosome damage and mutations are induced in mammalian cells lacking carboxylesterase activity (human lymphocy...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/15.1.45
更新日期:2000-01-01 00:00:00
abstract::The mechanistic/mammalian target of rapamycin (mTOR) is a conserved protein kinase that controls several anabolic processes required for cell growth and proliferation. As such, mTOR has been implicated in an increasing number of pathological conditions, including cancer, obesity, type 2 diabetes and neurodegeneration....
journal_title:Mutagenesis
pub_type: 杂志文章,评审
doi:10.1093/mutage/geu045
更新日期:2015-03-01 00:00:00
abstract::The complementation group (CG) assignment is presented for 74 moderately sensitive (approximately 2-4x sensitivity of parental line based on ratio of D10s) UV-sensitive mutants of Chinese hamster ovary (CHO) cells from the Facility for Automated Experiments in Cell Biology (FAECB) collection. The distribution of mutan...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/9.4.301
更新日期:1994-07-01 00:00:00
abstract::In order to validate the in vivo micronucleus test in mouse splenocytes using the cytokinesis block method, 14 compounds with various mechanisms of action were tested: three direct alkylating agents (mitomycin C, ethylnitrosourea, beta-propiolactone), seven indirect alkylating agents (cyclophosphamide, benzo[a]pyrene,...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/9.3.199
更新日期:1994-05-01 00:00:00
abstract::The carcinogenicity prediction and battery selection (CPBS) procedure was used to analyze the short-term in vitro and in vivo genotoxicity results obtained during the Second UKEMS Collaborative Study. In accordance with preliminary animal bioassay results, CPBS predicted correctly the carcinogenicity of benzidine, 4,4...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/1.2.119
更新日期:1986-03-01 00:00:00
abstract::Inter-individual differences in susceptibility to breast cancer are partially mediated through the levels of endogenous and exogenous steroid hormones. The CYP17 gene encodes P450c17alpha, an enzyme that is involved in the metabolism of steroid hormones. Increased endogenous steroid hormone levels have been associated...
journal_title:Mutagenesis
pub_type: 杂志文章,meta分析
doi:10.1093/mutage/17.2.119
更新日期:2002-03-01 00:00:00
abstract::All of the published mutagenicity data generated using the Muta Mouse (lacZ) and the Big Blue (lacI) transgenic mouse mutation assays have been re-presented in a standard format. To date, 26 chemicals have been evaluated in one or other of the assays, and eight tissues have been sampled. The present analysis should ex...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/9.4.367
更新日期:1994-07-01 00:00:00
abstract::The International Agency for Research on Cancer has classified several antineoplastic drugs in Group 1 (human carcinogens), among which chlorambucil, cyclophosphamide (CP) and tamoxifen, Group 2A (probable human carcinogens), among which cisplatin, etoposide, N-ethyl- and N-methyl-N-nitrosourea, and Group 2B (possible...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/geq102
更新日期:2011-05-01 00:00:00
abstract::The human metabolome-the complement of small molecule metabolites present in biofluids and tissues-represents a significant part of the internal chemical milieu and is therefore an important aspect of the human exposome. Metabolic profiling approaches, commonly referred to as metabonomics or metabolomics, permit detai...
journal_title:Mutagenesis
pub_type: 杂志文章,评审
doi:10.1093/mutage/gev060
更新日期:2015-11-01 00:00:00
abstract::The use of DNA adduct analysis has previously focused on the use of marine organisms for biomonitoring, whereas similar investigations in freshwater organisms are sparse. In that context, we have investigated the relevance of DNA adducts as biomarkers of genotoxicity in the freshwater mussels Dreissena polymorpha. The...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/ges036
更新日期:2012-11-01 00:00:00
abstract::An established human hepatoma cell strain (Hep G2) was used in micronuclei (MN) and sister chromatid exchange (SCE) assays to evaluate the clastogenic potential of several indirectly-acting mutagenic carcinogens. Benzo[a]pyrene, cyclophosphamide, dimethyl nitrosamine, hexamethylphosphoramide, pyrene and safrole were s...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/6.5.399
更新日期:1991-09-01 00:00:00
abstract::We have developed a two dose/single-sample protocol for the in vivo/in vitro rat hepatocyte unscheduled DNA synthesis (UDS) assay. In order to enhance the effectiveness of grain detection by image analysis we found minor technical modifications to be beneficial. These included the use of 3% acetic acid in ethanol (or ...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/11.1.19
更新日期:1996-01-01 00:00:00
abstract::Transgenic B6C3F1 and C57BL/6 mice containing a lambda shuttle vector that carries a lacI target and an alpha lacZ reporter gene have been constructed for use in in vivo mutagenesis assays. After chemical treatment of mice carrying the lacI target gene, genomic DNA is isolated and the shuttle vector is recovered by ex...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/8.3.265
更新日期:1993-05-01 00:00:00
abstract::The accumulation of mitochondrial DNA (mtDNA) mutations has been proposed as an underlying cause of the ageing process and mutations have been associated with cancer in many tissues, including human skin. This involvement is linked to the key roles of mitochondrial function and mtDNA in oxidative stress production and...
journal_title:Mutagenesis
pub_type: 杂志文章,评审
doi:10.1093/mutage/gep061
更新日期:2010-03-01 00:00:00
abstract::The genotoxicity of alpha-hexachlorocyclohexane (alpha-HCH) was evaluated in primary cultures of mouse, rat and human hepatocytes. DNA fragmentation was measured by the alkaline elution technique and DNA repair synthesis by quantitative autoradiography. A 20 h exposure to subtoxic concentrations ranging from 0.056 to ...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/11.1.79
更新日期:1996-01-01 00:00:00
abstract::Five independently isolated glutathione-deficient (gsh-) mutants of Saccharomyces cerevisae with maximally 6% residual glutathione content have been analysed genetically. Complementation as well as tetrad analysis of the homo- and heterozygous diploids constructed by suitable crosses of the five mutants indicated that...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/5.1.39
更新日期:1990-01-01 00:00:00
abstract::Chinese hamster ovary cells were exposed to N-hydroxy-2-aminofluorene, N-hydroxy-N'-acetylbenzidine and 1-nitrosopyrene, and the resulting DNA adducts, sister-chromatid exchanges (SCEs) and mutations at the hypoxanthine-guanine phosphoribosyl transferase locus were quantified. Each agent produced a major DNA adduct su...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/1.3.201
更新日期:1986-05-01 00:00:00
abstract::Non-homologous end joining (NHEJ), the major pathway of double-strand break (DSB) repair in mammalian cells, comprises two subpathways: one that requires the three core factors Ku70/80, DNA-PKcs and XRCC4/LigIV (DNA-PK-dependent NHEJ) and the other that is independent of these factors. Using a cell-free NHEJ assay, we...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/gem007
更新日期:2007-05-01 00:00:00
abstract::Genotoxic stress causes a reduced stability of the plant genome and has a detrimental effect on plant growth and productivity. Double-strand breaks (DSBs) are the most harmful of all DNA lesions because they cause the loss of genetic information on both strands of the DNA helix. In the presented study the coding and g...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/gev033
更新日期:2015-11-01 00:00:00
abstract::Zeocin is a member of the bleomycin/phleomycin family of antibiotics, known to bind and cleave DNA. We established human SK-OV-3 cells that stably express the Zeocin resistance gene (Sh ble) using an ecdysone-inducible mammalian expression system. Surprisingly, our results demonstrated that Zeocin, added in the cultur...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/gei016
更新日期:2005-03-01 00:00:00
abstract::Alzheimer's disease (AD) is a neurodegenerative disorder of the elderly with a complex etiology due to the interaction between genetic and environmental factors. At least 15% of cases are inherited as an autosomal dominant mutation, but the majority are sporadic. We evaluated cytogenetic alterations, both spontaneous ...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/16.4.323
更新日期:2001-07-01 00:00:00
abstract::Macrocyclic polyethers (crown ethers) are a family of compounds that possess the ability to complex with and transport metal ions across membranes. Because of their unique ionophoric characteristic, they have wide application in industry and research, chemistry and biology. In the current investigation the relationshi...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/13.1.27
更新日期:1998-01-01 00:00:00
abstract::Recombinant lambda phage DNA containing segments of human O6-methylguanine-DNA transferase gene was employed to localize this gene among the human chromosomes using non-radioactive in situ hybridization technique. This gene was found to be present at the telomeric end, 26q, of the long arm of the chromosome 10. ...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/7.1.83
更新日期:1992-01-01 00:00:00
abstract::To evaluate the genetic damage induced by tuberculosis infection and also by a combination of therapeutic exposure to anti-tuberculosis (anti-TB) drugs (isoniazid + rifampicin + pyrazinamide + ethambutol or streptomycin) we have considered chromosome aberrations (CA) and micronuclei (MN) in binucleate peripheral blood...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/15.6.489
更新日期:2000-11-01 00:00:00
abstract::Sister chromatid exchanges (SCE) and chromosome aberrations (CA) were studied in the lymphocytes of 70 male agricultural workers occupationally exposed to several pesticides and 69 matched controls, without indication of exposure to pesticides, from 'El Maresme' (Barcelona, Spain), Comparison between both groups revea...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/8.6.511
更新日期:1993-11-01 00:00:00
abstract::Cyclophosphamide (CP)-induced micronuclei were evaluated in females of two strains of mice (C57BL and CD1), in F1 hybrid females and in fetuses (day 13 of gestation) obtained from different crosses. F1 adult hybrids from a cross between the strain with a high level of induced micronuclei (C57BL) and the strain with a ...
journal_title:Mutagenesis
pub_type: 杂志文章
doi:10.1093/mutage/2.3.173
更新日期:1987-05-01 00:00:00
abstract::A working party was set up by the UK Environmental Mutagen Society to consider alternatives to Aroclor 1254 (Aroclor)-induced S9 in in vitro genotoxicity assays, with the aims of considering whether a replacement for Aroclor in its role in general screening assays could be readily identified. The working party conclud...
journal_title:Mutagenesis
pub_type:
doi:10.1093/mutage/7.3.175
更新日期:1992-05-01 00:00:00