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    Wyświetlanie 1-3 z 3
    Tytuł:
    The effect of mono- and divalent cations on Tetrahymena thermophila telomeric repeat fragment. A photon correlation spectroscopy study.
    Autorzy:
    Włodarczyk, Agnieszka
    Patkowski, Adam
    Grzybowski, Przemysław
    Dobek, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1041510.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    chromosome ends
    G-quadruplex
    telomeric DNA
    photon correlation spectroscopy
    structure transition
    Opis:
    The structure of the Tetrahymena thermophila telomeric sequence d(TGGGGT)4 was studied by photon correlation spectroscopy (PCS) in aqueous solution in the presence of NaCl, KCl and SrCl2. The sample studied was polydisperse in all conditions studied. Translational diffusion coefficients DT describing the diffusion modes observed were determined. On the basis of a comparison between the experimental DT values with those calculated assuming the bead model, two forms were identified as telomeric quadruplex structures: monomer and tetramer. In the presence of SrCl2 formation of aggregates was observed, with a size that reached several micrometres. The relative weighted concentrations of the structures observed for different concentrations of a salt and DNA were determined. The results obtained in the presence of monovalent ions were qualitatively similar and could be presented in a coherent plot in which the concentration of salt was expressed by the number of ions per DNA molecule. A large number of ions per DNA molecule favoured tetramer formation while a small number favoured the monomer form. A structural phase transition from the monomer to the tetramer induced by a change in the number of ions per DNA molecule was observed. The main difference between the results for Na+ and K+ was a greater effectiveness of the K+ ions in formation of tetramers. The effect of Sr2+ ions on the structures formed was different than that of the monovalent ions. The results obtained in the presence of Sr2+ could not be described as a function of the number of ions per DNA molecule.
    Źródło:
    Acta Biochimica Polonica; 2004, 51, 4; 971-981
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The balance between pro- and anti-inflammatory cytokines in the immune responses to BCG and DTwP vaccines
    Autorzy:
    Druszczynska, Magdalena
    Kowalewicz-Kulbat, Magdalena
    Maszewska, Agnieszka
    Rudnicka, Karolina
    Szpakowski, Piotr
    Wawrocki, Sebastian
    Wlodarczyk, Marcin
    Rudnicka, Wiesława
    Powiązania:
    https://bibliotekanauki.pl/articles/1038943.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    BCG
    pertussis
    IFN-gamma
    IL-10
    tuberculin skin test
    dendritic cells
    Opis:
    Bacillus Calmette-Guérin (BCG) and pertussis vaccines have been found to be insufficient and their further improvement is required. In order to develop improved vaccines, a better understanding of the main pathways involved in the host's protective immunity to the pathogens is crucial. We address the question as to whether the balance between pro- and anti-inflammatory cytokine production might affect the host responses to BCG and diphtheria-tetanus toxoids-whole cell pertussis (DTwP) vaccines. The study population consisted of 118 healthy people, age range 18-30 years, who had been subjected to BCG and DTwP vaccination according to the state policy. Tuberculin skin testing (TST) revealed a delayed type hypersensitivity (DTH) to PPD (purified protein derivative) in 53% volunteers. The variability in development of the BCG-driven DTH to tuberculin prompted us to address a question as to whether Th1/Th2 polarization is involved in the lack of skin responsiveness to PPD. PPD-stimulated blood lymphocytes from TST+ participants produced significantly more IFN-γ and less IL-10 than lymphocytes from TST- volunteers. However, TST- volunteers' sera contained more anti-pertussis IgG but not anti-diphtheria toxin IgG. Mycobacterial antigens and particularly PPD induced a higher expression of HLA-DR and co-stimulatory CD80 receptors on DCs from TST+ than TST- participants. BCG but not PPD pulsed DCs from TST- volunteers produced significantly more IL-10. Mycobacterial antigen stimulated DCs from TST+ volunteers induced a more intense IFN-γ production in co-cultures with autologous lymphocytes than the cells from TST- participants. Differences among the types of dendritic cell activities contribute to development of tuberculin reactivity in BCG vaccinated volunteers.
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 4; 913-921
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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