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    Wyświetlanie 1-9 z 9
    Tytuł:
    Changes in GSH-antioxidant system induced by daunorubicin in human normal and diabetic fibroblasts.
    Autorzy:
    Zatorska, Agnieszka
    Maszewski, Janusz
    Jóźwiak, Zofia
    Powiązania:
    https://bibliotekanauki.pl/articles/1043460.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    glutathione S-transferase
    glutathione reductase
    glutathione peroxidase
    daunorubicin
    apoptosis
    glutathione
    oxidative stress
    Opis:
    We investigated the effect of daunorubicin on glutathione content and activity of GSH-related enzymes in cultured normal and diabetic human fibroblasts. Cells were incubated with 4 μM daunorubicin (DNR) for 2 h followed by culture in drug-free medium for up to 72 h. Treatment of diabetic cells with the drug caused a time-dependent depletion of intracellular GSH and a decrease of the GSH to total glutathione ratio. GSH depletion was accompanied by apoptotic changes in morphology of the nucleus. Analysis of GSH-related enzymes showed a significant increase of the activities of Se-dependent and Se-independent peroxidases and glutathione S-transferase. In contrast, glutathione reductase activity was reduced by 50%. Significant differences between normal and diabetic cells exposed to DNR were observed in the level of GST and Se-dependent glutathione peroxidase activities. These findings indicated that daunorubicin efficiently affects the GSH antioxidant defense system both in normal and diabetic fibroblasts leading to disturbances in glutathione content as well as in the activity of GSH-related enzymes.
    Źródło:
    Acta Biochimica Polonica; 2003, 50, 3; 825-835
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Glutathione and GSH-dependent enzymes in patients with liver cirrhosis and hepatocellular carcinoma
    Autorzy:
    Czeczot, Hanna
    Ścibior, Dorota
    Skrzycki, Michał
    Podsiad, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1041298.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    malondialdehyde
    glutathione S-transferase
    glutathione reductase
    liver cirrhosis
    glutathione peroxidase
    glutathione
    hepatocellular carcinoma
    Opis:
    We investigated glutathione level, activities of selenium independent GSH peroxidase, selenium dependent GSH peroxidase, GSH S-transferase, GSH reductase and the rate of lipid peroxidation expressed as the level of malondialdehyde in liver tissues obtained from patients diagnosed with cirrhosis or hepatocellular carcinoma. GSH level was found to be lower in malignant tissues compared to adjacent normal tissues and it was higher in cancer than in cirrhotic tissue. Non-Se-GSH-Px activity was lower in cancer tissue compared with adjacent normal liver or cirrhotic tissue, while Se-GSH-Px activity in cancer was found to be similar to its activity in cirrhotic tissue and lower compared to control tissue. An increase in GST activity was observed in cirrhotic tissue compared with cancer tissue, whereas the GST activity in cancer was lower than in adjacent normal tissue. The activity of GSH-R was similar in cirrhotic and cancer tissues, but higher in cancer tissue compared to control liver tissue. An increased level of MDA was found in cancer tissue in comparison with control tissue, besides its level was higher in cancer tissue than in cirrhotic tissue. Our results show that the antioxidant system of cirrhosis and hepatocellular carcinoma is severely impaired. This is associated with changes of glutathione level and activities of GSH-dependent enzymes in liver tissue. GSH and enzymes cooperating with it are important factors in the process of liver diseases development.
    Źródło:
    Acta Biochimica Polonica; 2006, 53, 1; 237-242
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tocopherol esters inhibit human glutathione S-transferase omega
    Autorzy:
    Sampayo-Reyes, Adriana
    Zakharyan, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/1041213.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    glutathione S-transferase
    human
    hGSTO1-1
    MMA(V) reductase
    Vitamin E
    Opis:
    Human glutathione S-transferase omega 1-1 (hGSTO1-1) is a newly identified member of the glutathione S-transferase (GST) family of genes, which also contains alpha, mu, pi, sigma, theta, and zeta members. hGSTO1-1 catalyzes the reduction of arsenate, monomethylarsenate (MMA(V)), and dimethylarsenate (DMA(V)) and exhibits thioltransferase and dehydroascorbate reductase activities. Recent evidence has show that cytokine release inhibitory drugs, which specifically inhibit interleukin-1b (IL-1b), directly target hGSTO1-1. We found that (+)-α-tocopherol phosphate and (+)-α-tocopherol succinate inhibit hGSTO1-1 in a concentration-dependent manner with IC50 values of 2 µM and 4 µM, respectively. A Lineweaver-Burk plot demonstrated the uncompetitive nature of this inhibition. The molecular mechanism behind the inhibition of hGSTO1-1 by α-tocopherol esters (vitamin E) is important for understanding neurodegenerative diseases, which are also influenced by vitamin E.
    Źródło:
    Acta Biochimica Polonica; 2006, 53, 3; 547-552
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lipid peroxidation and cell cycle signaling : 4-hydroxynonenal, a key molecule in stress mediated signaling.
    Autorzy:
    Yang, Yusong
    Sharma, Rajendra
    Sharma, Abha
    Awasthi, Sanjay
    Awasthi, Yogesh
    Powiązania:
    https://bibliotekanauki.pl/articles/1043608.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    glutathione S-transferase
    RLIP76
    4-hydroxynonenal
    RalBP1
    cell cycle signaling
    apoptosis
    Opis:
    Role of lipid peroxidation products, particularly 4-hydroxynonenal (4-HNE) in cell cycle signaling is becoming increasingly clear. In this article, recent studies suggesting an important role of 4-HNE in stress mediated signaling for apoptosis are critically evaluated. Evidence demonstrating the modulation of UV, oxidative stress, and chemical stress mediated apoptosis by blocking lipid peroxidation by the α-class glutathione S-transferases (GSTs) is presented which suggest an important role of these enzymes in protection against oxidative stress and a role of lipid peroxidation products in stress mediated signaling. Overexpression of 4-HNE metabolizing GSTs (mGSTA4-4, hGSTA4-4, or hGST5.8) protects cells against 4-HNE, oxidative stress (H2O2 or xanthine/xanthine oxidase), and UV-A mediated apoptosis by blocking JNK and caspase activation suggesting a role of 4-HNE in the mechanisms of apoptosis caused by these stress factors. The intracellular concentration of 4-HNE appears to be crucial for the nature of cell cycle signaling and may be a determinant for the signaling for differentiation, proliferation, transformation, or apoptosis. The intracellular concentrations of 4-HNE are regulated through a coordinated action of GSTs (GSTA4-4 and hGST5.8) which conjugate 4-HNE to GSH to form the conjugate (GS-HNE) and the transporter 76 kDa Ral-binding GTPase activating protein (RLIP76), which catalyze ATP-dependent transport of GS-HNE. A mild stress caused by heat, UV-A, or H2O2 with no apparent effect on the cells in culture causes a rapid, transient induction of hGST5.8 and RLIP76. These stress preconditioned cells acquire ability to metabolize and exclude 4-HNE at an accelerated pace and acquire relative resistance to apoptosis by UV and oxidative stress as compared to unconditioned control cells. This resistance of stress preconditioned cells can be abrogated by coating the cells with anti-RLIP76 antibodies which block the transport of GS-HNE. These studies and previous reports discussed in this article strongly suggest a key role of 4-HNE in stress mediated signaling.
    Źródło:
    Acta Biochimica Polonica; 2003, 50, 2; 319-336
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Glutathione-dependent responses of plants to drought: a review
    Autorzy:
    Labudda, M.
    Azam, F.M.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/58164.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    abiotic stress
    plant response
    glutathione peroxidase
    glutathione S-transferase
    reactive oxygen species
    S-glutathionylation
    water deficit
    drought
    Opis:
    Water is a renewable resource. However, with the human population growth, economic development and improved living standards, the world’s supply of fresh water is steadily decreasing and consequently water resources for agricultural production are limited and diminishing. Water deficiency is a significant problem in agriculture and increasing efforts are currently being made to understand plant tolerance mechanisms and to develop new tools (especially molecular) that could underpin plant breeding and cultivation. However, the biochemical and molecular mechanisms of plant water deficit tolerance are not fully understood, and the data available is incomplete. Here, we review the significance of glutathione and its related enzymes in plant responses to drought. Firstly, the roles of reduced glutathione and reduced/ oxidized glutathione ratio, are discussed, followed by an extensive discussion of glutathione related enzymes, which play an important role in plant responses to drought. Special attention is given to the S-glutathionylation of proteins, which is involved in cell metabolism regulation and redox signaling in photosynthetic organisms subjected to abiotic stress. The review concludes with a brief overview of future perspectives for the involvement of glutathione and related enzymes in drought stress responses.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2014, 83, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of magnetic fields on the activity of enzymes: alpha- and beta-amylase and glutathione S-transferase [GST] in wheat plants
    Autorzy:
    Rochalska, M.
    Grabowska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/25053.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    wheat plant
    magnetic field
    glutathione S-transferase
    beta-amylase
    enzyme
    alpha-amylase
    magnetic biostimulation
    germination
    Źródło:
    International Agrophysics; 2007, 21, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role of browning enzymes in cherries
    Autorzy:
    Ruzickova, Kristyna
    Leitgeb, Maja
    Powiązania:
    https://bibliotekanauki.pl/articles/1429800.pdf
    Data publikacji:
    2021
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    cherry fruit
    browning enzymes
    softening enzymes
    glutathione S-transferase
    owoce wiśni
    enzymy
    enzymy zmiękczające
    S-transferaza glutationowa
    Opis:
    Cherries contain significant amounts of important nutrients and bioactive food components including fibre, polyphenols, carotenoids, vitamin C, potassium. They are also good source of tryptophan, serotonin, and melatonin. Beside the fact that cherries are considered as an excellent source of numerous nutrients and they also present a low caloric content. These facts lead to their increasing popularity in the human diet. Numerous studies suggest that their regular consumption has a positive effect on health and the well-being of individuals. Another bioactive food components found in cherries are enzymes. The interest in research about enzymes in cherries is not so significant as for other compounds like polyphenols or vitamins. However, number of studies were carried out to characterise enzymes and their function in cherries especially with relation to extending their shelf life. The aim of this work is to give a brief overview of latest research on browning enzymes, softening enzymes and glutathione S-transferase.
    Źródło:
    Acta Innovations; 2021, 38; 12-22
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ koenzymu Q10 na stres oksydacyjny komórki indukowany ksenobiotykami
    The influence of coenzyme Q10 on xenobiotic-induced oxidative stress of cell
    Autorzy:
    Frączkowski, K.
    Kopaczyńska, M.
    Sawicka, E.
    Długosz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/261117.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
    Tematy:
    koenzym Q10
    dysmutaza ponadtlenkowa
    peroksydaza glutationowa
    S-transferaza glutationowa
    stres oksydacyjny
    cisplatyna
    coenzyme Q10
    superoxide dismutase
    glutathione peroxidase
    glutathione S-transferase
    oxidative stress
    cisplatin
    Opis:
    Cisplatyna jest cytostatykiem o wysokiej skuteczności w leczeniu nowotworów złośliwych, jednak powoduje poważne skutki uboczne, najczęściej w postaci uszkodzenia nerek (nefrotoksyczność), wątroby (hepatotoksyczność) i narządu słuchu (ototoksyczność). Jednym z ubocznych skutków chemioterapii przy zastosowaniu cisplatyny jest wywoływanie przez ten ksenobiotyk stresu oksydacyjnego w komórkach. Wolne rodniki powstające pod wpływem cisplatyny mogą być neutralizowane przez egzogenne i endogenne antyoksydanty (np. koenzym Q10). Koenzym Q10 (CoQ10) jest silnym antyoksydantem nieenzymatycznym, obecnym we wszystkich komórkach organizmu człowieka. W warunkach fizjologicznych, CoQ10 syntetyzowany jest w wystarczających ilościach do prawidłowej ochrony antyoksydacyjnej komórek, jednak w przebiegu chorób nowotworowych, a także podczas chemioterapii jego stężenie może znacznie się obniżyć. Celem przeprowadzonych badań była charakterystyka wpływu CoQ10 na stres oksydacyjny komórki indukowany cisplatyną. Za pomocą metod spektrofotometrycznych, oznaczano in vitro aktywność enzymów antyoksydacyjnych w erytrocytach – dysmutazy ponadtlenkowej (SOD) i peroksydazy glutationowej (GPx) oraz w mitochondriach – aktywność enzymu detoksykacyjnego II fazy biotransformacji – S-transferazy glutationowej (GST) po dodaniu cisplatyny oraz oceniano wpływ CoQ10 na aktywność tych enzymów. Na podstawie przeprowadzonych badań wykazano, że w stresie oksydacyjnym indukowanym cisplatyną, CoQ10 hamował spadek aktywności SOD oraz GPx w krwinkach czerwonych po dodaniu ksenobiotyku. Suplementacja CoQ10 u pacjentów przed rozpoczęciem chemioterapii może uzupełniać niedobory tego związku w organizmie oraz zwiększać odporność komórek na uszkodzenia oksydacyjne indukowane ksenobiotykiem.
    Cisplatin is one of the most effective cytotoxic agents in the treatment of cancers. However, cisplatin has number of severe side effects, including such ones as nephrotoxicity, hepatotoxicity and ototoxicity. It is reported that cisplatin-induced oxidative stress in normal cells is one of the side effects of chemotherapy with cisplatin. Free radicals that are generated under the influence of cisplatin, are neutralized by endogenous and exogenous antioxidants (e.g. coenzyme Q10). Coenzyme Q10 (CoQ10) is a strong non-enzymatic antioxidant, presented in all cells of human body. Under physiological conditions, CoQ10 is synthesized in sufficient quantity to ensure proper antioxidant protection of cells. However, the concentration of CoQ10 may be decreased by cancers and chemotherapy. The purpose of this study was to characterize the influence of CoQ10 on the cisplatin-induced oxidative stress. Using spectroscopic methods, the activity of antioxidative enzymes in erythrocytes – superoxide dismutase (SOD) and glutathione peroxidase (GPx) and in the mitochondria – activity of II phase biotransformation enzyme – glutathione S-transferase (GST) after exposure to cisplatin was measured in vitro and the effect of CoQ10 on antioxidative enzymes activity was studied. CoQ10 inhibited the reduction in SOD and GPx activity after administration of cisplatin. However, the activity of GST, in samples with CoQ10, was reduced after exposure to cisplatin. The supplementation of CoQ10, before starting cisplatin chemotherapy, can minimalize the toxicity of cisplatin to normal cells.
    Źródło:
    Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2013, 19, 4; 196-204
    1234-5563
    Pojawia się w:
    Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detoxifying enzyme studies on cotton leafhopper, Amrasca biguttula biguttula (Ishida), resistance to neonicotinoid insecticides in field populations in Karnataka, India
    Autorzy:
    Halappa, B.
    Patil, R.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/65885.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    detoxifying enzyme
    cotton leafhopper
    cotton
    Gossypium
    Amrasca biguttula biguttula
    resistance
    neonicotinoid
    bioassay
    glutathione S-transferase
    insecticide
    field population
    Karnataka state
    India
    Opis:
    The cotton leafhopper (Amrasca biguttula biguttula Ishida) is considered to be an alarming insect pest causing both quantitative and qualitative loss in cotton. In situ bioassay studies were done and the role of detoxifying enzymes in conferring resistance to neonicotinoid groups of insecticides in low (MUD), medium (DVG), high (HVR) and very high (GLB) pesticide usage areas of Karnataka were determined. Bioassay studies showed that imidacloprid, thiamethoxam, acetamiprid, thiacloprid and clothianidin registered varying levels of resistance for all the locations studied. The resistance ratio was high in imidacloprid (3.35, 8.57, 9.15 and 12.27 fold respectively) and the lowest in dinoferuran (1.86, 5.13, 6.71 and 9.88 fold respectively). Furthermore, the enzyme activity ratio (glutathione-S-transferase) was relatively greater, and corresponded to the higher LC50 values of neonicotinoids for very high, high, medium and low pesticide usage areas. Our study suggested that the higher activity of the detoxifying enzyme in the resistance population of cotton leafhopper apparently has a significant role in endowing resistance to neonicotinoid groups of insecticides. However, this study recommends using neonicotinoids in cotton growing areas with caution.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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