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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

Ascorbate promotes the cellular accumulation of doxorubicin and reverses the multidrug resistance in breast cancer cells by inducing ROS-dependent ATP depletion.

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Chemotherapy is the most effective strategy for the treatment of metastatic breast cancer. However, P-glycoprotein (P-gp)-mediated multidrug resistance severely limits the efficacy of chemotherapy and is a major cause of the failure during chemotherapeutic treatment. In this study, we investigated

Ascorbate supplementation inhibits growth and metastasis of B16FO melanoma and 4T1 breast cancer cells in vitamin C-deficient mice.

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Degradation of the extracellular matrix (ECM) plays a critical role in the formation of tumors and metastasis and has been found to correlate with the aggressiveness of tumor growth and invasiveness of cancer. Ascorbic acid, which is known to be essential for the structural integrity of the

Ascorbate (vitamin C) induces cell death through the apoptosis-inducing factor in human breast cancer cells.

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Although ascorbate (Vitamin C) has been shown to inhibit cell growth and induce cell death in variety of cancer cells, results reported in other studies are inconsistent with this conclusion. It was previously reported that ascorbate induces apoptosis in human breast cancer cells. However, the

SVCT-2 in breast cancer acts as an indicator for L-ascorbate treatment.

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L-ascorbate (L-ascorbic acid, vitamin C) clearly has an inhibitory effect on cancer cells. However, the mechanism underlying differential sensitivity of cancer cells from same tissue to L-ascorbate is yet to be clarified. Here, we demonstrate that L-ascorbate has a selective killing effect, which is

Activation of the hypoxia pathway in breast cancer tissue and patient survival are inversely associated with tumor ascorbate levels.

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The transcription factor hypoxia inducible factor (HIF) -1 drives tumor growth and metastasis and is associated with poor prognosis in breast cancer. Ascorbate can moderate HIF-1 activity in vitro and is associated with HIF pathway activation in a number of cancer types, but whether

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

Cytotoxic effects of Mn(III) N-alkylpyridylporphyrins in the presence of cellular reductant, ascorbate.

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Due to the ability to easily accept and donate electrons Mn(III)N-alkylpyridylporphyrins (MnPs) can dismute O(2)(·-), reduce peroxynitrite, but also generate reactive species and behave as pro-oxidants if conditions favour such action. Herein two ortho isomers, MnTE-2-PyP(5+), MnTnHex-2-PyP(5+), and

Lipoprotein(a) and vitamin C impair development of breast cancer tumors in Lp(a)+; Gulo-/- mice.

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Cancer progression is characterized by loss of extracellular matrix (ECM) integrity, which is a precondition for tumor growth and metastasis. In order to elucidate the precise mechanisms of ECM degradation in cancer we used a genetically modified mouse mimicking two distinct human metabolic features

Ascorbic acid and cell survival of adriamycin resistant and sensitive MCF-7 breast tumor cells.

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The ability of human cells to regenerate ascorbic acid from dehydroascorbate is partially dependent on the glutathione redox status of the cell and the relative activity of dehydroascorbate reductases. Mammalian dehydroascorbate reductase activity is associated with two proteins known as

Metabolomics and lipidomics study unveils the impact of polybrominated diphenyl ether-47 on breast cancer mice.

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Polybrominated diphenyl ether-47 (BDE-47) is a congener of polybrominated diphenyl ethers (PBDEs) and relates to different health risks. However, in vivo study of the association between BDE-47 and breast cancer was scarce. In this study, we performed in vivo exposure of BDE-47 to breast cancer nude

Droloxifene (3-hydroxytamoxifen) has membrane antioxidant ability: potential relevance to its mechanism of therapeutic action in breast cancer.

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Droloxifene (3-hydroxytamoxifen), is a triphenylethylene derivative recently developed for the treatment of breast cancer. Droloxifene was found to exhibit a membrane antioxidant ability in that it inhibited Fe(III)-ascorbate dependent lipid peroxidation in rat liver microsomes and ox-brain

The redox state of cytochrome c modulates resistance to methotrexate in human MCF7 breast cancer cells.

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BACKGROUND Methotrexate is a chemotherapeutic agent used to treat a variety of cancers. However, the occurrence of resistance limits its effectiveness. Cytochrome c in its reduced state is less capable of triggering the apoptotic cascade. Thus, we set up to study the relationship among redox state

Enhancement of doxorubicin cytotoxicity by polyunsaturated fatty acids in the human breast tumor cell line MDA-MB-231: relationship to lipid peroxidation.

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Exogenous polyunsaturated fatty acids modulate the cytotoxic activity of anti-cancer drugs. In this study, we examined whether lipid peroxidation is a potential mechanism through which fatty acids enhance drug cytotoxicity. We measured cell viability in the human breast cancer cell line MDA-MB-231

The metabolism of 17 beta-estradiol by lactoperoxidase: a possible source of oxidative stress in breast cancer.

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Electron spin resonance (ESR) spectroscopy and oxygen consumption measurements using a Clark-type oxygen electrode have been used to study the metabolism of the estrogen 17 beta-estradiol by lactoperoxidase. Evidence for a one-electron oxidation of estradiol to its reactive phenoxyl radical

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