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ornithine/tumori dojke
Veza se sprema u međuspremnik
Page 1 od 150 rezultati
Role of ornithine decarboxylase in regulation of estrogen receptor alpha expression and growth in human breast cancer cells.
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Our previous studies demonstrated that specific polyamine analogues, oligoamines, down-regulated the activity of a key polyamine biosynthesis enzyme, ornithine decarboxylase (ODC), and suppressed expression of estrogen receptor alpha (ERα) in human breast cancer cells. However, the mechanism
Ornithine and breast cancer: a matched case-control study
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In vivo and vitro evidence indicates that ornithine and its related metabolic products play a role in tumor development. Whether ornithine is associated with breast cancer in humans is still unclear. We examined the association between circulating ornithine levels and breast cancer in females. This
Chlorpheniramine inhibits the synthesis of ornithine decarboxylase and the proliferation of human breast cancer cell lines.
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Proliferation of both mouse and human breast cancer cells was inhibited by chlorpheniramine (CPA) in a dose-response manner. At the beginning of the exponential phase of growth (two days after seeding), 250 microM CPA was able to reduce cell proliferation by 75% (in Ehrlich cell cultures) and 30%
Immunohistochemical detection of ornithine-decarboxylase in primary and metastatic human breast cancer specimens.
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Increased ornithine decarboxylase (ODC) activity in human breast cancer specimens has recently been shown to be an independent adverse prognostic factor for recurrence and death. Biochemical measurement of ODC, however, is not practical for routine clinical use. Furthermore, it does not take into
Estrogen-dependent regulation of ornithine decarboxylase in breast cancer cells through activation of nongenomic cAMP-dependent pathways.
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17beta-estradiol (E2) induces ornithine decarboxylase (ODC) activity in several E2-responsive tissues/cells, and this study investigated the mechanism of hormone-induced transactivation in MCF-7 human breast cancer cells. E2-induced reporter gene (luciferase) activity in MCF-7 cells transfected with
Regulation of ornithine decarboxylase gene expression in MCF-7 breast cancer cells by antiestrogens.
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Ornithine decarboxylase (ODC) is an enzyme intimately related to cell growth regulation. The metabolic products of ODC, the polyamines, are known to play a vital role in the structure and function of biological macromolecules including nucleic acids and proteins. The activity of ODC is stimulated by
Regulation of ornithine decarboxylase mRNA levels in human breast cancer cells: pattern of expression and involvement of core enhancer promoter element.
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Ornithine decarboxylase (ODC) expression is increased by growth factors and is obligatory for progression through the cell cycle in a wide variety of cell types. In this study, a variant human ODC cDNA was identified, sequenced, and used to probe mRNA levels in human breast tumor cell lines and
Polyamine profiles and growth properties of ornithine decarboxylase overexpressing MCF-7 breast cancer cells in culture.
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To determine the direct influence of the polyamine (PA) pathway on breast cancer phenotype, we employed a transfection approach to induce overexpression of the PA biosynthetic enzyme ornithine decarboxylase (ODC) in the hormone-responsive MCF-7 breast cancer cell line. Using a modified calcium
Urtica dioica inhibits cell growth and induces apoptosis by targeting Ornithine decarboxylase and Adenosine deaminase as key regulatory enzymes in adenosine and polyamines homeostasis in human breast cancer cell lines.
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Breast cancer is a heterogeneous and multifactorial disease with variable disease progression risk, and treatment response. Urtica dioica is a traditional herb used as an adjuvant therapeutic agent in cancer. In the present study, we have evaluated the effects of the aqueous extract of Urtica dioica
Phenotypic features of breast cancer cells overexpressing ornithine-decarboxylase.
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Polyamines (PA) have been shown to be critical mediators of estradiol-induced breast cancer cell proliferation. This finding suggests that constitutive activation of the PA pathway may promote tumor progression, possibly leading to hormone independence. To test this hypothesis, we transfected
Expression of ornithine decarboxylase mRNA and c-myc mRNA in breast tumours.
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We examined the expression of ornithine decarboxylase (ODC) mRNA in 53 female cases of breast cancer by a reverse transcriptase-polymerase chain reaction (RT-PCR) assay to determine the clinicopathologic significance of its expression. A significantly higher expression of ODC mRNA was, observed in
Variations in amplification and expression of the ornithine decarboxylase gene in human breast cancer cells.
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The polyamine biosynthetic pathway plays a critical role in the growth of human breast cancer cells. Ornithine decarboxylase (ODC) is a key enzyme in polyamine biosynthesis. To understand the regulation of ODC activity and polyamine accumulation in breast cancer cells, we studied amplification and
Ornithine decarboxylase activity, prolactin blood levels, and estradiol and progesterone receptors in human breast cancer.
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Ornithine decarboxylase (ODC) activity in human breast cancer tissues was correlated with prolactinemia (Prl), estradiol and progesterone cytosol receptors (ER and PR), and histopathologic pattern. Ninety-two cases of breast cancer, six benign mammary disease, and three normal breast tissues were
Ornithine decarboxylase and phosphatase activity can be stimulated by low concentrations of interferon in human breast cancer cell lines.
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The activity of the enzyme ornithine decarboxylase (ODC) is increased in confluent culture of two breast cancer cell lines (T47D and MCF-7) following a change of medium. The increase in activity is maximum at 12 hours and this level is reduced in cells treated with high concentrations of
Chemotherapy in a Breast Cancer Patient Heterozygous Carrier of Ornithine Transcarbamylase Deficiency
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Urea cycle disorders (UCDs) are an unusual genetic condition that may lead to hyperammonemia in catabolic situations such as surgery, infections or chemotherapy administration. Without specific treatment, it causes life-threatening encephalopathy. We present the case of a young woman, heterozygous
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