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    Wyświetlanie 1-8 z 8
    Tytuł:
    Analysis of chromosome aberrations, sister chromatid exchanges [SCE] and cell division kinetics in human lymphocytes exposed in vitro to new monophosphates of pyrimidine acyclonucleosides
    Autorzy:
    Ferenc, T
    Rutkowski, M.
    Bratkowska, W.
    Hubner, H.
    Draminski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044452.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    statistical analysis
    chromatid gap
    chromosome number
    enzyme activity
    chromosome aberration
    in vitro
    chromosome gap
    pyrimidine
    phosphorylase
    acyclonucleoside monophosphate
    human lymphocyte
    sister chromatid exchange
    cell division
    Opis:
    Five newly synthesised monophosphates of two pyrimidine acyclonucleoside series, namely 1-N-[(2’-hydroxy)ethoxymethyl] and l-N-[(l’,3’-dihydroxy)- 2’-propoxymethyl] derivatives of 5- and 5,6-alkylated uracils were tested in vitro for chromosome aberrations and sister chromatid exchanges (SCE). Metaphase plates were obtained via microculture of human lymphocytes from heparinized peripheral blood. The compounds were tested in doses: 10, 20, 40, 80 and 150 µg per mL of culture. The tested compounds induced mainly chromatid gaps, less frequently chromosome gaps. A low number of mitoses with chromatid and chromosome breaks, acentric fragments, dicentric chromosomes and exchange figures were also observed. The tested compounds in doses: 40, 80 and 150 µg per mL, doubled or tripled the percentage of cells with chromatid gaps and chromosome gaps as compared to the control. The percentage o cells with aberrations (excluding gaps) induced by the tested compounds in all doses did not exceed 2%. The tested compounds induced a higher number of SCE per cell but less than double frequency as compared to the control. SCE frequencies and replication index (RI) values varied depending on the examined compounds. For the highest dose of the tested compounds (150 µg per mL) a significant decrease in RI values was observed for l-N-[(2’-hydroxy)ethoxymethyl]-5,6-tetramethyleneuracil monophosphate and for l-N-[(2’-hydroxy)ethoxymethyl]-5,6-dimethyluracil monophosphate. So far, the results have indicated potential clastogenicity of all the tested compounds except acycloguanosine monophosphate.
    Źródło:
    Journal of Applied Genetics; 1998, 39, 1; 113-127
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of chlorpyrifos on the profile of subpopulations immunocompetent cells B, T and NK in in vivo model
    Autorzy:
    Noworyta-Glowacka, J.
    Beresinska, M.
    Bankowski, R.
    Wiadrowska, B.
    Siennicka, J.
    Ludwicki, J.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/875152.pdf
    Data publikacji:
    2014
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    chlorpyrifos
    pesticide
    human exposure
    immunomodulation
    B cell
    T cell
    natural killer cell
    in vivo model
    immune system
    lymphocyte
    organophosphorus pesticide
    Opis:
    Background. Current studies have indicated many environmental factors, such as pesticides, that cause immune system disorders through inducing changes in humoral and cellular responses thereby increasing the risk of contracting infectious diseases and cancer. The literature suggests that low exposures to certain organophosphorus pesticides stimulate the immune system, whilst high exposures result in decreased function. Precise mechanisms for the fall in immunocompetence are often unclear, however it can be predicted that the intimate interaction between the nervous and immune systems can potentially lead to toxicity. Objectives. To determine the effects of organophosphorus pesticide, chlorpyrifos that is often used in Poland, on selected immunological responses, such as immune-competent cell proportions formed experimentally in-vivo by cells of Wistar rats during subchronic exposures after 45 and 90 days. Materials and Methods. The test was carried out on ten male and ten female Wistar rats in each of three test groups, who received 3 chlorpyrifos doses for 90 days intragastrically, according to OECD guidelines (No. 401). Two control groups were given olive oil. After completion, the animals were deeply anaesthetised by a mixture of ketamine (Vetaketam) and xylazine (Vetaxym). Immuno-competent cells were profiled by a commercial monoclonal antibody method. In order to measure the dynamics of any changes, the aforementioned immunological responses were investigated after 45 days using the same procedures for obtaining the relevant biological test material. Results. Test animals exposed to chlorpyrifos had altered number of white bood cells which were either increased or decreased relative to controls after 45 and 90 days for all exposure levels used. Conclusions. The study demonstrated changes in white-blood cell (lymphocyte) response profiles, reflecting an immunomodulation although such changes were equivocal, where both suppression and stimulation were observed.
    Wprowadzenie. Współczesne badania naukowe wskazują, iż wiele czynników środowiskowych, wliczając w to pestycydy, powoduje zaburzenia układu odpornościowego poprzez indukowanie zmian w odpowiedzi humoralnej i komórkowej, co w efekcie może prowadzić do zwiększonej zapadalności na choroby zakaźne i nowotworowe. Doniesienia literaturowe sugerują, że niskie poziomy narażenia na niektóre pestycydy fosforoorganiczne powodują stymulację układu odpornościowego, zaś wyższe, obniżenie funkcji immunologicznych. W wielu przypadkach nie jest poznany dokładny mechanizm spadku odporności, jednak poprzez związek funkcji neurologicznych i immunologicznych można przewidzieć potencjalne skutki działania toksycznego. Cel. Celem badań było określenie wpływu chloropiryfosu na wybrane parametry odpowiedzi immunologicznej, takie jak skład odsetkowy komórek immunokompetentnych w modelu doświadczalnym in vivo szczurów laboratoryjnych szczepu Wistar, w trakcie ekspozycji subchronicznej 45 i 90 dniowej. Materiał i metody. Badanie wykonano na samcach (10 szt.) i samicach (10 szt.) szczurów rasy Wistar. Zwierzętom z grupy badanej podawano dożołądkowo chloropiryfos przez 90 dni, zgodnie z zaleceniami OECD (Guideline No 401). Grupa kontrolna otrzymywała oliwę z oliwek. Po zakończeniu eksperymentu zwierzęta poddawano głębokiej narkozie przy użyciu mieszaniny: ketaminy (Vetaketam) i ksylazyny (Vetaxym). W celu określenia dynamiki ewentualnych zmian zbadano wyżej wymienione parametry immunologiczne po 45 dniach doświadczenia przy zachowaniu tych samych procedur uzyskania materiału badawczego. Wyniki. Uzyskane wyniki wskazują, że narażanie zwierząt doświadczalnych na chloropiryfos zmieniało skład odsetkowy komórek immunokompetentnych w modelu doświadczalnym in vivo zwiększając albo zmniejszając ich wartość w stosunku do poziomów oznaczonych u grupy zwierząt kontrolnych po 45 i 90 dniowej ekspozycji i na wszystkich poziomach narażania. Wnioski. Odnotowane w wyniku przeprowadzonych badań zmiany w profilu białokrwinkowym świadczące o działaniu immunomodulującym były niejednoznaczne przyjmując formę zarówno immunosupresji jak i immunostymulacji.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2014, 65, 4
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of acetylsalicylic acid and a new pyrazine derivative PD-101 on sister chromatid exchange frequency and cell kinetics in cultured human lymphocytes
    Autorzy:
    Wozniak, A
    Limon, J.
    Petrusewicz, J.
    Kaliszan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044238.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pyrazine
    cell cycle
    human lymphocyte
    cytogenetic analysis
    sister chromatid exchange
    kinetics
    chromosome aberration
    in vitro
    acetylsalicylic acid
    Opis:
    Acetylsalicylic acid (ASA) and α-2-pyrazylidene-α-cyano N-butyl acetamide (PD-101), a new antiaggregatory pyrazine derivative were tested for their genotoxicity in human lymphocytes in vitro using the sister chromatid exchange (SCE) technique. Both compounds were found to be inactive in inducing SCE in concentration from 1 µM up to 1000 µM. The agents displayed inhibitory effect on cell kinetics.
    Źródło:
    Journal of Applied Genetics; 1998, 39, 3; 281-287
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of cysteine on mechlorethamine - induced chromosomal aberrations in cultured human lymphocytes
    Autorzy:
    Blaszczyk, A
    Powiązania:
    https://bibliotekanauki.pl/articles/2048200.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cysteine
    lymphocyte
    human lymphocyte
    chromosome aberration
    in vitro
    mechlorethamine
    mutagenicity test
    Opis:
    The aim of the present paper was to find out by in vitro chromosomal aberration test using human lymphocytes whether cysteine has anticlastogenic properties towards a well-known mutagen - mechlorethamine. The lymphocytes tested were obtained from three healthy donors. Two doses of cysteine (1.0 and 2.0 μg/ml) and three doses of mechlorethamine (0.1,0.2 and 0.3 μg m⁻¹) were tested. It was found that cysteine had anticlastogenic properties and that it reduced the number of metaphases with chromosomal aberrations induced by mechlorethamine.
    Źródło:
    Journal of Applied Genetics; 1995, 36, 4; 389-393
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified neutral comet assay for human lymphocytes
    Autorzy:
    Wojewódzka, M.
    Grądzka, I.
    Buraczewska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/147130.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    DNA double strand breaks
    human lymphocyte
    neutral comet assay
    Opis:
    Comet assay under neutral conditions allows the detection of DNA double-strand breaks, considered to be the biologically relevant radiation-induced lesion. In this report we describe modifications of the neutral comet method, which simplify and facilitate its use for estimation of DNA double strand breaks in human lymphocytes irradiated with doses of 60Co gamma-rays (from 10 to 100 Gy). The analysis carried out according to this protocol takes less time than those published so far. Also, the use of lysis at 50°C is avoided; this is important in view of the presence of heat-labile sites in the DNA of irradiated cells, recently reported by Rydberg [12]. The comets have well defined, sharp limits, are suitable for computer image analysis and chromatin of the control cells remains condensed.
    Źródło:
    Nukleonika; 2002, 47, 1; 1-5
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular follow up of donor lymphocyte infusion in CML children after allogeneic bone marrow transplantation
    Autorzy:
    Ladon, D
    Pieczonka, A.
    Jolkowska, J.
    Wachowiak, J.
    Witt, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048295.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    minimal residual disease
    in situ
    human genetics
    bone marrow
    hybridization
    fluorescence
    donor lymphocyte infusion
    chronic myeloid leukemia
    child
    polymerase chain reaction
    transplantation
    Źródło:
    Journal of Applied Genetics; 2001, 42, 4; 547-552
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship between DNA replication and DNA repair in human lymphocytes proliferating in vitro in the presence and in absence of mutagen
    Autorzy:
    Szyfter, K
    Wiktorowicz, K.
    Wielgosz, M.S.
    Zajaczek, S.
    Kujawski, M.
    Jaloszynski, P.
    Czub, M.
    Markowska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048210.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    genotoxicity
    DNA replication
    human lymphocyte
    DNA repair
    lymphocyte proliferation
    mutagenesis
    in vitro
    Opis:
    The effects of mutagens on DNA replication and DNA repair were studied in peripheral blood lymphocytes (PBL) obtained from 21 healthy subjects, 2 samples from healthy heterozygote of Xeroderma pigmentosum (XP) and 2 samples from patient with clinically recognised XP. Inter-individual variations were found in DNA replication and in the level of spontaneous DNA repair measured under standard culture condition. Exposure of human PBL proliferating in vitro to B(a)P was followed by a partial inhibition of replicative DNA synthesis in all subjects and by an induction of DNA repair in healthy subjects. In XP patients DNA repair synthesis remained at the level attributed to spontaneous DNA repair. The response to mutagen varied individually. Results were analysed statistically. It was established that the studied indices of DNA synthesis correlate well with each other. The highest correlation was found between the levels of spontaneous and B(a)P-induced DNA repair. It is concluded that the level of spontaneous DNA repair is predictive for an estimation of cells ability to repair DNA damage. Inter-individual variations in the inhibition of DNA replication and in DNA repair synthesis are also dependent on the type of mutagen as shown by effects of other mutagens. Different effects of mutagen exposure on the inhibition of DNA replicative synthesis and induction of DNA repair can be explained by genetically controlled differences in the activity of enzymes responsible for mutagen processing and lesion removal.
    Źródło:
    Journal of Applied Genetics; 1995, 36, 4; 379-388
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Searching for in vitro biomarkers of susceptibility to prostate and cervical cancers by analysis of chromosomal instability, gamma-H2AX foci, polymorphisms in DNA repair genes and apoptosis
    Autorzy:
    Wegierek-Ciuk, A.
    Arabski, M.
    Kedzierawski, P.
    Florek, A.
    Solowiej, D.
    Gozdz, S.
    Lisowska, H.
    Kowalik, A.
    Kowalska, M.
    Wojcik, A.
    Polanska, J.
    Lankoff, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/3629.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    in vitro biomarker
    susceptibility
    prostate
    cervical cancer
    cancer
    patient
    human disease
    lymphocyte
    man
    ionizing radiation
    chromosome instability
    gamma-H2AX biomarker
    polymorphism
    DNA repair gene
    apoptosis
    Opis:
    Introduction and objective. According to the cancer epidemiology databases, cancer is the second leading cause of death in developing countries. Moreover, the WHO predicts a continuing increase in the incidence of cancer, extending this trend well into the next several decades. Hence, it seems obvious that the prediction of cancer susceptibility and early diagnosis is an important goal for modern biomedical sciences. The aim of this study is to clarify the value of chromosomal damage, capacity for the repair of double-strand breaks (DSBs), polymorphisms in DNA repair genes, and apoptosis as prognostic markers for prostate and cervical cancer. Materials and methods. 30 prostate cancer patients and 30 cervical cancer patients were enrolled into the study. In addition, 30 healthy female donors and 30 healthy male donors served as controls. The following endpoints were investigated: frequency of micronuclei, gamma-H2AX fluorescence, XRCC1 194C>T, XRCC1 399G>A, XRCC3 IVS5–14 A>G, OGG1 326 Ser>Cys polymorphisms and apoptosis. Results. Among all tested factors, only the homozygous variant (Arg/Arg) in XRCC1 (399 Arg/Gln) was strongly associated with prostate cancer risk, and only a low apoptotic response was connected with cervical cancer risk. The presented study confirmed a positive association between the frequency of MN and increased prostate and cervical cancer risk. However, such a biomarker is not cancer specific. In addition, the information gained by analyzing the gamma-H2AX fluorescence, as well apoptosis, had no value for predicting the risk of prostate and cervical cancers. Conclusions. The final conclusion of the study is that cancer susceptibility is a complex phenotype not readily detectable in relatively small studies by functional assays or analysis of SNP in few, selected genes.
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2015, 09, 2
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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