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Gene expression after treatment with hydrogen peroxide, menadione, or t-butyl hydroperoxide in breast cancer cells.

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Global gene expression patterns in breast cancer cells after treatment with oxidants (hydrogen peroxide, menadione, and t-butyl hydroperoxide) were investigated in three replicate experiments. RNA collected after treatment (at 1, 3, 7, and 24 h) rather than after a single time point, enabled an

Combined treatment of menadione and calcitriol increases the antiproliferative effect by promoting oxidative/nitrosative stress, mitochondrial dysfunction, and autophagy in breast cancer MCF-7 cells

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The aim of this study was to determine new insights into the molecular mechanisms involved in the antiproliferative action of menadione + calcitriol (MEN+D) on MCF-7 cells. After 24 h, MEN+D inhibited the cell growth but was not observed with each single treatment. The combined drugs reduced the

Combined calcitriol and menadione reduces experimental murine triple negative breast tumor.

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BACKGROUND Calcitriol (D) or 1,25(OH)2D3 inhibits the growth of several tumor cells including breast cancer cells, by activating cell death pathways. Menadione (MEN), a glutathione-depleting compound, may be used to potentiate the antiproliferative actions of D on cancer cells. We have previously

Triple Combination of Ascorbate, Menadione and the Inhibition of Peroxiredoxin-1 Produces Synergistic Cytotoxic Effects in Triple-Negative Breast Cancer Cells.

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Triple-negative breast cancer (TNBC) is an aggressive form of mammary malignancy currently without satisfactory systemic treatment options. Agents generating reactive oxygen species (ROS), such as ascorbate (Asc) and menadione (Men), especially applied in combination, have been proposed as an

Antiproliferative action of menadione and 1,25(OH)2D3 on breast cancer cells.

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Calcitriol or 1,25(OH)(2)D(3) is a negative growth regulator of MCF-7 breast cancer cells. The growth arrest is due to apoptosis activation, which involves mitochondrial disruption. This effect is blunted in vitamin D resistant cells (MCF-7(DRes) cells). Menadione (MEN), a glutathione

Menadione reduction by pharmacological doses of ascorbate induces an oxidative stress that kills breast cancer cells.

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Oxidative stress generated by ascorbate-driven menadione redox cycling kills MCF7 cells by a concerted mechanism including glycolysis inhibition, loss of calcium homeostasis, DNA damage and changes in mitogen activated protein kinases (MAPK) activities. Cell death is mediated by necrosis rather than

Overexpression of NAD(P)H:quinone oxidoreductase 1 (NQO1) and genomic gain of the NQO1 locus modulates breast cancer cell sensitivity to quinones.

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OBJECTIVE Alterations in the expression of antioxidant enzymes are associated with changes in cancer cell sensitivity to chemotherapeutic drugs (menadione and β-lapachone). Mechanisms of acquisition of resistance to pro-oxidant drugs were investigated using a model of oxidative stress-resistant

Menadione-induced DNA damage in a human tumor cell line.

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The nature and extent of menadione (MD)-induced DNA damage were explored using the human breast cancer cell line MCF-7. Concentration-dependent single-strand (ss) and double-strand (ds) DNA breaks were detected in MD-treated MCF-7 cells using the alkaline- and neutral-elution techniques,

Genes responsive to both oxidant stress and loss of estrogen receptor function identify a poor prognosis group of estrogen receptor positive primary breast cancers.

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BACKGROUND Oxidative stress can modify estrogen receptor (ER) structure and function, including induction of progesterone receptor (PR), altering the biology and clinical behavior of endocrine responsive (ER-positive) breast cancer. METHODS To investigate the impact of oxidative stress on

Black cohosh (Cimicifuga racemosa L.) protects against menadione-induced DNA damage through scavenging of reactive oxygen species: bioassay-directed isolation and characterization of active principles.

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The roots/rhizomes of Cimicifuga racemosa L. (Nutt.) (black cohosh) have traditionally been used to treat menopausal symptoms through an unknown mechanism of action. In an effort to determine if black cohosh had additional health benefits, methanol extracts were investigated for their potential to

Differential behaviors of trastuzumab-sensitive and -resistant SKBR3 cells treated with menadione reveal the involvement of Notch1/Akt/FOXO1 signaling elements.

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Given that HER2 serves as a putative target for therapy in HER2-positive breast cancer, intrinsic and/or acquired resistance to trastuzumab (T) has been proposed to be the major obstacle in treatments. In addition, chemoresistance is commonly attributed to increased antioxidant capacity. In that

Oxidant stress impaired DNA-binding of estrogen receptor from human breast cancer.

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Full-length (67 kDa) immunoreactive estrogen receptor (ER) extracted from a third of untreated ER-positive primary breast tumors appears unable to bind to its cognate estrogen response element (ERE). We have observed partial reversibility of this ER DNA-binding defect upon treatment of these tumor

alpha-Ketoacids scavenge H2O2 in vitro and in vivo and reduce menadione-induced DNA injury and cytotoxicity.

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We demonstrate that alpha-ketoacids reduce and, in some instances, abrogate menadione-induced DNA damage and cytotoxicity in the human breast cancer cell line, MCF7. We confirm that alpha-ketoacids quench the copious amounts of H2O2 generated by menadione while these alpha-ketoacids undergo

Vitamin K3 (menadione)-induced oncosis associated with keratin 8 phosphorylation and histone H3 arylation.

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The vitamin K analog menadione (K3), capable of both redox cycling and arylating nucleophilic substrates by Michael addition, has been extensively studied as a model stress-inducing quinone in both cell culture and animal model systems. Exposure of keratin 8 (k-8) expressing human breast cancer

Evaluation of Potential Mechanisms Controlling the Catalase Expression in Breast Cancer Cells.

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Development of cancer cell resistance against prooxidant drugs limits its potential clinical use. MCF-7 breast cancer cells chronically exposed to ascorbate/menadione became resistant (Resox cells) by increasing mainly catalase activity. Since catalase appears as an anticancer target, the

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