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Wyszukujesz frazę "antisense oligonucleotides" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Multidrug resistance-associated protein - reduction of expression in human leukaemia cells by antisense phosphorothioate olignucleotides.
    Autorzy:
    Niewiarowski, Wojciech
    Gendaszewska, Edyta
    Rębowski, Grzegorz
    Wójcik, Marzena
    >Mikołajczyk, Barbara
    Soszyński, Mirosław
    Bartosz, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1044273.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    antisense oligonucleotides
    MRP
    multidrug resistance
    Opis:
    Multidrug resistance-associated protein (MRP1) causes cellular drug resistance in several cancer cell lines. In this paper we show that antisense oligonucleotides decrease MRP1 expression in human leukaemia cells. We investigated biological activity of a series of 12 linear phosphorothioate oligonucleotides, complementary to several regions of MRP1 mRNA. The oligonucleotides were administered to leukaemia HL60/ADR cells overexpressing MRP1 protein. Then, the level of MRP1 mRNA was determined by means of semiquantitative RT-PCR and the protein level by reaction with specific monoclonal antibodies. Some of the investigated antisense oligonucleotides decrease the expression level of the MRP1 protein by 46% and its mRNA level by 76%.
    Źródło:
    Acta Biochimica Polonica; 2000, 47, 4; 1183-1188
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    RNA modulation, repair and remodeling by splice switching oligonucleotides.
    Autorzy:
    Kole, Ryszard
    Williams, Tiffany
    Cohen, Lisa
    Powiązania:
    https://bibliotekanauki.pl/articles/1043268.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    RNA splicing; antisense oligonucleotides; genetic disease
    Opis:
    Targeting splicing by antisense oligonucleotides allows RNA modifications that are not possible with RNA interference or other antisense techniques that destine the RNA for destruction. By changing the ratio of naturally occurring splice variants the expression of mRNA is modulated. By preventing the use of an aberrant splice site created by a mutation and enforcing re-selection of correct splice sites the RNA is repaired. Antisense induced skipping of the exon that carries a nonsense mutation remodels the mRNA and restores the reading frame of the defective protein. All of the above approaches have clinical applications. Modulation of splice variants is particularly important since close to 60% of all genes code for alternatively spliced pre-mRNA.
    Źródło:
    Acta Biochimica Polonica; 2004, 51, 2; 373-378
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tissue distribution of a menthyl-conjugated oligodeoxyribonucleotide antisense to PAI-1 mRNA
    Autorzy:
    Szemraj, Janusz
    Al-Nedawi, Khalid
    Chabielska, Ewa
    Buczko, Wlodzimierz
    Pawlowska, Zofia
    Powiązania:
    https://bibliotekanauki.pl/articles/1041329.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    PAI-1
    antisense oligonucleotides
    tissue distribution
    Opis:
    The inhibitory effect of numerous analogues of PO-16, an hexadecadeoxyribonucleotide antisense to sequences -22 to -17 of PAI-1 mRNA coding for a fragment of the signal peptide, on the expression of PAI-1 in endothelial cells, and physiological consequences of the subsequently reduced PAI-1 activity tested in vitro and in vivo, were described in our previous studies. Of particular interest was PO-16 5'-O-conjugated with menthyl phosphorothioate (MPO-16R). In this work, tissue localisation of MPO-16R labelled with [35S] phosphorothioate at the 3'-end, was determined. [35S]MPO-16R and control [35S]MPO-16R-SENSE oligonucleotides were administered intravenously into 22 rats and organ distribution of the labelled bioconjugates was assessed after 24 and 48 h. For this purpose, tissue sections were subjected to autoradiography, and quantitated by liquid scintillation after solubilisation. Overall clearance of radioactivity was already seen after 24 h, with the radioactivity recovered mainly in the kidney and liver. A smaller fraction of radioactivity was also retained in the spleen and heart. The kidney concentration of the labelled probe was higher than that of liver by 50%. The distribution of PAI-1 mRNA in untreated rat kidney, liver, spleen and heart established by two independent techniques: Ribonuclease Protection Assay and Real-Time PCR, shows the same pattern as that observed for [35S]MPO-16R antisense.
    Źródło:
    Acta Biochimica Polonica; 2005, 52, 4; 849-855
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antisense hairpin loop oligonucleotides as inhibitors of expression of multidrug resistance-associated protein 1: Their stability in fetal calf serum and human plasma.
    Autorzy:
    Rębowski, Grzegorz
    Wójcik, Marzena
    Boczkowska, Małgorzata
    Gendaszewska, Edyta
    Soszyński, Mirosław
    Bartosz, Grzegorz
    Niewiarowski, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/1044049.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    human plasma
    3' -exonuclease activity
    multidrug resistance-associated protein
    fetal calf serum
    antisense hairpin loop oligonucleotides
    Opis:
    Multidrug resistance-associated protein (MRP1) is a transmembrane pump protein responsible for the efflux of chemotherapeutic drugs, an important cause of anticancer treatment failure. Trying to circumvent MRP-mediated resistance we designed and synthesized hairpin loops forming antisense oligodeoxyribonucleotides (ODNs), both phosphodiesters (PO-ODNs) and their phosphorothioate analogues (PS-ODNs), to reduce the protein expression by targeting its mRNA in a sequence specific manner. Melting temperature measurements as well as polyacrylamide gel electrophoresis supported the preferential formation of a secondary structure, which was expected to protect ODNs against 3'-exonuclease degradation. ODNs and PS-ODNs designed in this work were successfully tested as antisense inhibitors of the expression of MRP1 in the leukaemia HL60/ADR cell line. Foreseeing the necessity to perform clinical studies with such ODNs we investigated their stability against the 3'-exonuclease activity of fetal calf serum and human plasma. Under the conditions, corresponding to physiological ones, we observed high stability of hairpin loop forming ODNs, especially those containing longer (e.g. 7 base pair) stems. Comparative studies on the stability of chemically unmodified hairpin loop forming ODNs and their PS-counterparts indicated that endonuclease activity did not play any important role in the process of their nucleolytic degradation. Our studies provide strong evidence for high stability of chemically unmodified hairpin loop ODNs, making them an attractive alternative to phosphorothioate analogues commonly used in antisense strategy.
    Źródło:
    Acta Biochimica Polonica; 2001, 48, 4; 1061-1076
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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