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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effects of high sucrose diet, gemfibrozil, and their combination on plasma paraoxonase 1 activity and lipid levels in rats
    Autorzy:
    Macan, Marija
    Vrkić, Nada
    Vrdoljak, Ana
    Radić, Božica
    Bradamante, Vlasta
    Powiązania:
    https://bibliotekanauki.pl/articles/1040374.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    paraoxonase
    lipids
    high sucrose diet
    gemfibrozil
    Opis:
    We investigated the influence of high sucrose diet (HSD) after 3 or 5 weeks of administration on paraoxonase 1 (PON1) activity in plasma of normolipidemic rats and the relationship between serum PON1 activity, triacylglycerides (TGs), HDL and total cholesterol vs. the control group of rats fed normal, control diet (CD). Because the data about the influence of gemfibrozil (GEM) on PON1 activity are controversial, we also investigated its effects (administration in the 4th and 5th week in rats on HSD and CD) on plasma PON1 activity and lipid levels in normolipidemic rats, and in rats with hypertriglyceridemia caused by HSD. Our results obtained in rats on HSD show a significant increase of plasma TGs levels by 47% (P<0.05) after 5 weeks of treatment, and PON1 activity by 32% and 23% (P<0.05) after 3 and 5 weeks, but without change in lipid levels vs. rats on CD. In the rats on CD and HSD, GEM caused a significant decrease of PON1 activity by 44% and 33%, while a significant decrease of TGs level by 38% (P<0.05) was measured only in rats on CD. The effects of GEM on total cholesterol, HDL and LDL in both groups of rats were typical for its action on lipoprotein metabolism. Because GEM in the rat liver stimulates proliferation of peroxisomes, β oxidation, and production of H2O2, it is possible that the oxidative stress induced by GEM damages hepatocytes and lowers the synthesis of PON1.
    Źródło:
    Acta Biochimica Polonica; 2010, 57, 3; 321-326
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of HI-6 oxime: potential use in protection of human acetylcholinesterase inhibited by antineoplastic drug irinotecan and its cyto/genotoxicity in vitro
    Autorzy:
    Radić, Božica
    Vrdoljak, Ana
    Želježić, Davor
    Fuchs, Nino
    Berend, Suzana
    Kopjar, Nevenka
    Powiązania:
    https://bibliotekanauki.pl/articles/1041045.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    irinotecan
    HI-6
    protection
    reactivation
    micronuclei
    apoptosis
    comet assay
    acetylcholinesterase
    chromosome aberrations
    Opis:
    The function of acetylcholinesterase (AChE) is the rapid hydrolysis of the neurotransmitter acetylcholine (ACh), which is involved in the numerous cholinergic pathways in both the central and the peripheral nervous system. Therefore, AChE measurement is of high value for therapy management, especially during the course of intoxication with different chemicals or drugs that inhibit the enzyme. Pyridinium or bispyridinium aldoximes (oximes) are able to recover the activity of the inhibited enzyme. Since their adverse effects are not well elucidated, in this study the efficiency of HI-6 oxime in protection and/or reactivation of human erythrocyte AChE inhibited by the antineoplastic drug irinotecan as well as its cyto/genotoxicity in vitro were investigated. HI-6 was effective in protection of AChE and increased its activity up to 30%; the residual activity after irinotecan inhibition was 7%. Also, it reactivated the enzyme previously inhibited by 50% irinotecan (4.6 µg/ml) applied at ¼ of the IC50 value. The tested concentrations of HI-6 exhibited acceptable genotoxicity towards white blood cells, as estimated by the alkaline comet assay, DNA diffusion assay and cytogenetic endpoints (structural chromosome aberrations and cytokinesis-block micronucleus assay). The results obtained warrant the further investigation of HI-6 in vivo, as well as its development for possible application in chemotherapy.
    Źródło:
    Acta Biochimica Polonica; 2007, 54, 3; 583-593
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tenocyclidine treatment in soman-poisoned rats - intriguing results on genotoxicity versus protection
    Autorzy:
    Petek, Maja
    Berend, Suzana
    Kopjar, Nevenka
    Želježić, Davor
    Mladinić, Marin
    Radić, Božica
    Vrdoljak, Ana
    Powiązania:
    https://bibliotekanauki.pl/articles/1040822.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    rat
    tenocyclidine
    soman
    cholinesterase activity
    brain
    genotoxicity
    comet assay
    plasma
    Opis:
    This study aimed to evaluate the antidotal potency of tenocyclidine (TCP) that probably might protect acetylcholinesterase (AChE) in the case of organophosphate poisoning. TCP was tested alone as a pretreatment or in combination with atropine as a therapy in rats poisoned with ¼ and ½ of LD50 of soman. Possible genotoxic effects of TCP in white blood cells and brain tissue were also studied. Results were compared with previous findings on the adamantyl tenocyclidine derivative TAMORF. TCP given alone as pretreatment, 5 min before soman, seems to be superior in the protection of cholinesterase (ChE) catalytic activity in the plasma than in brain, especially after administration of the lower dose of soman. Plasma activities of the enzyme after a joint treatment with TCP and soman were significantly increased at 30 min (P < 0.001) and 24 h (P = 0.0043), as compared to soman alone. TCP and atropine, given as therapy, were more effective than TCP administered alone as a pretreatment. The above therapy significantly increased activities of the enzyme at 30 min (P = 0.046) and 24 h (P < 0.001), as compared to controls treated with ¼ LD50 of soman alone. Using the alkaline comet assay, acceptable genotoxicity of TCP was observed. However, the controversial role of TCP in brain protection of soman-poisoned rats should be studied further.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 1; 97-106
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A conjugate of pyridine-4-aldoxime and atropine as a potential antidote against organophosphorus compounds poisoning
    Autorzy:
    Lovrić, Jasna
    Berend, Suzana
    Lucić Vrdoljak, Ana
    Radić, Božica
    Katalinić, Maja
    Kovarik, Zrinka
    Želježić, Davor
    Kopjar, Nevenka
    Rast, Slavko
    Mesić, Milan
    Powiązania:
    https://bibliotekanauki.pl/articles/1039913.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    antidotal potential
    atropine
    genotoxicity
    pyridine-4-aldoxime
    organophosphates
    Opis:
    A conjugate of pyridine-4-aldoxime and atropine (ATR-4-OX) was synthesized and its antidotal efficiency was tested in vitro on tabun- or paraoxon-inhibited acetylcholinesterase (AChE) of human erythrocytes as well as in vivo using soman-, tabun- or paraoxon-poisoned mice. Its genotoxic profile was assessed on human lymphocytes in vitro and was found acceptable for further research. ATR-4-OX showed very weak antidotal activity, inadequate for soman or tabun poisoning. Conversely, it was effective against paraoxon poisoning both in vitro and in vivo. All animals treated with 5 % or 25 % LD50 doses of the new oxime survived after administration of 10.0 or 16.0 LD50 doses of paraoxon, respectively. Based on the persistence of toxicity symptoms in mice, the atropine moiety had questionable effects in attenuating such symptoms. It appears that ATR-4-OX has a therapeutic effect related to the reactivation of phosphylated AChE, but not to receptor antagonization.
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 2; 193-198
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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