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    Wyświetlanie 1-7 z 7
    Tytuł:
    A comparative study of the effects of genistein, estradiol and raloxifene on the murine skeletal system
    Autorzy:
    Śliwiński, Leszek
    Folwarczna, Joanna
    Nowińska, Barbara
    Cegieła, Urszula
    Pytlik, Maria
    Kaczmarczyk-Sedlak, Ilona
    Trzeciak, Hanna
    Trzeciak, Henryk
    Powiązania:
    https://bibliotekanauki.pl/articles/1040583.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    bone mechanical properties
    estradiol
    osteoclasts
    bone mineralization
    osteoblasts
    genistein
    raloxifene
    Opis:
    Genistein, a major phytoestrogen of soy, is considered a potential drug for prevention and treatment of postmenopausal osteoporosis. The aim of the present study was to compare the effects of genistein, estradiol and raloxifene on the skeletal system in vivo and in vitro. Genistein (5 mg/kg), estradiol (0.1 mg/kg) or raloxifene hydrochloride (5 mg/kg) were administered daily by a stomach tube to mature ovariectomized Wistar rats for 4 weeks. Bone mass, mineral and calcium content, macrometric parameters and mechanical properties were examined. Also the effects of genistein, estradiol and raloxifene (10-9-10-7 M) on the formation of osteoclasts from neonatal mouse bone marrow cells and the activity of osteoblasts isolated from neonatal mouse calvariae were compared. In vivo, estrogen deficiency resulted in the impairment of bone mineralization and bone mechanical properties. Raloxifene but not estradiol or genistein improved bone mineralization. Estradiol fully normalized the bone mechanical properties, whereas genistein augmented the deleterious effect of estrogen-deficiency on bone strength. In vitro, genistein, estradiol and raloxifene inhibited osteoclast formation from mouse bone marrow cells, decreasing the ratio of RANKL mRNA to osteoprotegerin mRNA expression in osteoblasts. Genistein, but not estradiol or raloxifene, decreased the ratio of alkaline phosphatase mRNA to ectonucleotide pyrophosphatase phosphodiesterase 1 mRNA expression in osteoblasts. This difference may explain the lack of genistein effect on bone mineralization observed in ovariectomized rats in the in vivo study. Concluding, our experiments demonstrated profound differences between the activities of genistein, estradiol and raloxifene towards the osseous tissue in experimental conditions.
    Źródło:
    Acta Biochimica Polonica; 2009, 56, 2; 261-270
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of estrogen-induced oxidative stress
    Autorzy:
    Kobiela, Jarek
    Stefaniak, Tomasz
    Krajewski, Jacek
    Kalinska-Blach, Beata
    Zurawa-Janicka, Dorota
    Lachinski, Andrzej
    Gackowski, Daniel
    Olinski, Ryszard
    Nowak, Jerzy
    Knap, narcyz
    Lipinska, Barbara
    Sledzinski, Zbigniew
    Wozniak, Michal
    Powiązania:
    https://bibliotekanauki.pl/articles/1041076.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    8-oxodGuo
    estradiol
    protein oxidation
    carcinogenesis
    DNA damage
    lipid peroxidation
    Opis:
    The objective of this study was to assess the dynamics of oxidative damage to cellular macromolecules such as proteins, lipids and DNA under conditions of oxidative stress triggering early stages of estrogen-dependent carcinogenesis. A rodent model of carcinogenesis was used. Syrian hamsters were sacrificed after 1, 3, 5 h and one month from the initial implantation of estradiol. Matching control groups were used. Kidneys as target organs for estradiol-mediated oxidative stress were excised and homogenized for biochemical assays. Subcellular fractions were isolated. Carbonyl groups (as a marker of protein oxidation) and lipid hydroxyperoxides were assessed. DNA was isolated and 8-oxodGuo was assessed. Electron paramagnetic resonance spectroscopy was used to confirm the results for lipid peroxidation. Exposition to estradiol in the rodent model leads to damage of macromolecules of the cell, including proteins and DNA, but not lipids. Proteins appear to be the primary target of the damage but are closely followed by DNA. It has previously been speculated that protein peroxides can increase DNA modifications. This time sequence was observed in our study. Nevertheless, the direct relation between protein and DNA damage still remains unsolved.
    Źródło:
    Acta Biochimica Polonica; 2007, 54, 2; 289-295
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Specific binding sites for progesterone and 17β-estradiol in cells of Triticum aestivum L.
    Autorzy:
    Janeczko, Anna
    Budziszewska, Bogusława
    Skoczowski, Andrzej
    Dybała, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1040676.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    vernalization
    progesterone
    radioligand binding assay
    Triticum aestivum L.
    17β-estradiol
    Opis:
    The presence and location of specific binding sites for progesterone and 17β-estradiol in cells of wheat were estimated using radioligand binding assay. Membrane and cytosolic fractions of non-vernalized and vernalized plants were tested using tritium-labelled ligands. Specific binding of [3H]progesterone and [3H]17β-estradiol occurs in wheat cells. The binding sites are located in membranes and in the cytosol. Specific binding of [3H]17β-estradiol is higher in the membranes than in the cytosol. Specific binding of both ligands in the cytosolic fraction is higher in vernalized plants than in non-vernalized ones. The possibility of the occurrence of steroid binding proteins specific for progesterone and 17β-estradiol, putative steroid receptors for these steroids in Triticum aestivum L., is discussed.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 4; 707-711
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in expression of serine proteases HtrA1 and HtrA2 during estrogen-induced oxidative stress and nephrocarcinogenesis in male Syrian hamster
    Autorzy:
    Zurawa-Janicka, Dorota
    Kobiela, Jaroslaw
    Stefaniak, Tomasz
    Wozniak, Agnieszka
    Narkiewicz, Joanna
    Wozniak, Michał
    Limon, Janusz
    Lipinska, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/1040768.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    17-β-estradiol
    HtrA proteases
    estrogen-induced carcinogenesis
    oxidative stress
    Opis:
    Serine proteases HtrA1 and HtrA2 are involved in cellular stress response and development of several diseases, including cancer. Our aim was to examine the involvement of the HtrA proteins in acute oxidative stress response induced in hamster kidney by estrogen treatment, and in nephrocarcinogenesis caused by prolonged estrogenization of male Syrian hamster. We used semi-quantitative RT-PCR to estimate the HtrA1 and HtrA2 mRNA levels in kidney tissues, and Western blotting to monitor the amount of the HtrA proteins. Within the first five hours following estrogen administration both HtrA1 mRNA and the protein levels were increased significantly. No changes in the expression of HtrA2 were observed. This indicates that HtrA1 may be involved in the response against oxidative stress induced by estrogen treatment in hamster kidney. During prolonged estrogenization, a significant reduction of the HtrA1 mRNA and protein levels was observed after 6 months of estradiol treatment, while the expression of HtrA2 was significantly elevated starting from the third month. This suggests an involvement of the HtrA proteins in estrogen-induced nephrocarcinogenesis in hamster. Using fluorescence in situ hybridization we localized the HtrA1 gene at the qb3-4 region of Syrian hamster chromosome 2, the region known to undergo a nonrandom deletion upon prolonged estrogenization. It is possible that the reduced level of HtrA1 expression is due to this chromosomal aberration. A full-length cDNA sequence of the hamster HtrA1 gene was obtained. It codes for a 50 kDa protein which has 98 and 96% identity with mouse and human counterparts, respectively.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 1; 9-20
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Can transforming growth factor-β1 and retinoids modify the activity of estradiol and antiestrogens in MCF-7 breast cancer cells?
    Autorzy:
    Czeczuga-Semeniuk, Ewa
    Anchim, Tomasz
    Dzięcioł, Janusz
    Dąbrowska, Milena
    Wołczyński, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/1041552.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    estradiol
    apoptotic index
    tamoxifen
    TGF-β1
    proliferation
    MCF-7
    retinoids
    Opis:
    Retinoic acid and transforming growth factor-β (TGF-β) affect differentiation, proliferation and carcinogenesis of epithelial cells. The effect of both compounds on the proliferation of cells of the hormone sensitive human breast cancer cell line (ER+) MCF-7 was assessed in the presence of estradiol and tamoxifen. The assay was based on [3H]thymidine incorporation and the proliferative activity of PCNA- and Ki 67-positive cells. The apoptotic index and expression of the Bcl-2 and p53 antigens in MCF-7 cells were also determined. Exogenous TGF-β1 added to the cell culture showed antiproliferative activity within the concentration range of 0.003-30 ng/ml. Irrespective of TGF-β1 concentrations, a marked reduction in the stimulatory action of estradiol (10-9 and 10-8 M) was observed whereas in combination with tamoxifen (10-7 and 10-6 M) only 30 ng/ml TGF-β1 caused a statistically significant reduction to aproximately 30% of the proliferative cells. In further experiments we examined the effect of exposure of breast cancer cells to retinoids in combination with TGF-β1. The incorporation of [3H]thymidine into MCF-7 cells was inhibited to 52 ± 19% (control =100%) by 3 ng/ml TGF-β1, and this dose was used throughout. It was found that addition of TGF-β1 and isotretinoin to the culture did not decrease proliferation, while TGF-β1 and tretinoin at low concentrations (3 × 10-8 and 3 × 10-7 M) reduced the percentage of proliferating cells by aproximately 30% (67±8% and 67±5%, P <0.05 compared to values in the tretinoin group). Both retinoids also led to a statistically significant decrease in the stimulatory effect of 10-9 M estradiol, attenuated by TGF-β1. In addition, the retinoids in combination with TGF-β1 and tamoxifen (10-6 M) caused a further reduction in the percentage of proliferating cells. Immunocytochemical analysis showed that all the examined compounds gave a statistically significant reduction in the percentage of cells with a positive reaction to PCNA and Ki 67 antigen. TGF-β1, isotretinoin and tretinoin added to the culture resulted in the lowest percentage of PCNA positive cells. However, the lowest fraction of Ki 67 positive cells was observed after addition of isotretinoin. The obtained results also confirm the fact that the well-known regulatory proteins Bcl-2 and p53 play an important role in the regulation of apoptosis in the MCF-7 cell line, with lowered Bcl-2 expression accompanying easier apoptotic induction. The majority of the examined compounds act via the p53 pathway although some bypass this important proapoptotic factor.
    Źródło:
    Acta Biochimica Polonica; 2004, 51, 3; 733-745
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The level of endogenous DNA damage in lymphocytes isolated from blood is associated with the fluctuation of 17β-estradiol concentration in the follicular phase of healthy young women.
    Autorzy:
    Kapiszewska, Maria
    Kalemba, Malgorzata
    Grzesiak, Aneta
    Kocemba, Kinga
    Powiązania:
    https://bibliotekanauki.pl/articles/1041444.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    endogenous DNA damage
    catechol-O-methyltransferase (COMT)
    comet assay
    17β-estradiol
    Opis:
    The aim of this study was to evaluate whether the differences in plasma 17β-estradiol concentration in early and late follicular phases of the menstrual cycle can affect the level of endogenous DNA damage in lymphocytes assessed by comet assay, and whether the extent of this damage in the follicular phase is associated with the genotype of catechol-O-methyltransferase (COMT). The level of DNA damage was positively correlated with 17β-estradiol concentration only in the late follicular phase. Subjects with the COMT L/L homozygous mutated variant revealed more DNA damage as compared to individuals with the COMT wild-type and heterozygous (H/L+HH) genotype.
    Źródło:
    Acta Biochimica Polonica; 2005, 52, 2; 535-539
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural phenolic acids may increase serum estradiol level in ovariectomized rats
    Autorzy:
    Zych, Maria
    Folwarczna, Joanna
    Trzeciak, Henryk
    Powiązania:
    https://bibliotekanauki.pl/articles/1040548.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    rat
    estradiol
    p-coumaric acid
    chlorogenic acid
    body mass
    caffeic acid
    ferulic acid
    Opis:
    Natural phenolic acids are commonly present in plants consumed in the diet. Recently we have observed that different natural phenolic acids exert differential effects on the body mass gain in ovariectomized and non-ovariectomized female rats. The aim of the present study was to investigate the effects of ferulic, caffeic, p-coumaric and chlorogenic acids on serum estradiol and total cholesterol levels in ovariectomized and non-ovariectomized rats. The experiments were carried out on 3-month old female Wistar Cmd:(WI)WU rats, divided into following groups (n=8 in each group): non-ovariectomized control rats and non-ovariectomized rats receiving ferulic, caffeic, p-coumaric or chlorogenic acids, sham-operated control rats, ovariectomized control rats and ovariectomized rats receiving the same phenolic acids. The phenolic acids were administered at a dose of 10 mg/kg p.o. daily for 4 weeks. Serum estradiol and total cholesterol levels on the next day after the last administration of the phenolic acids were examined. The phenolic acids did not affect serum estradiol or total cholesterol levels in non-ovariectomized rats. In ovariectomized rats, caffeic acid and to a lesser extent p-coumaric acid increased serum estradiol level, which effect correlated with a decreased body mass gain. All the phenolic acids decreased serum cholesterol level in ovariectomized rats. Concluding, the anti-obesity activity of some phenolic acids may be, at least partially, connected with estrogenic pathways.
    Źródło:
    Acta Biochimica Polonica; 2009, 56, 3; 503-507
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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