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Differential augmentative effects of buthionine sulfoximine and ascorbic acid in As2O3-induced ovarian cancer cell death: oxidative stress-independent and -dependent cytotoxic potentiation.

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The potential of arsenic trioxide (As2O3) as a novel therapy against ovarian cancer has been progressively recognized. Its prospective usefulness for treatment of this malignancy either alone or in combination with other chemotherapeutic agents has been increasingly explored. In this study, we

The antioxidant ascorbic acid mobilizes nuclear copper leading to a prooxidant breakage of cellular DNA: implications for chemotherapeutic action against cancer.

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OBJECTIVE Ascorbic acid is an essential micronutrient and is considered to have an antioxidant function in living systems. For the past several decades, ascorbic acid has been the subject of considerable interest as an anticancer agent. Several studies have shown that ascorbic acid is cytotoxic to a

Ascorbic Acid in Cancer Treatment: Let the Phoenix Fly.

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Vitamin C (ascorbic acid, ascorbate), despite controversy, has re-emerged as a promising anti-cancer agent. Recent knowledge of intravenous ascorbate pharmacokinetics and discovery of unexpected mechanisms of ascorbate action have spawned many investigations. Two mechanisms of anti-cancer activity

The effects of ascorbic acid and butylated hydroxyanisole in the chemoprevention of 1,2-dimethylhydrazine-induced large bowel neoplasms.

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Human large bowel neoplasia seems to be caused by environmental carcinogens. The experimental carcinogen, 1,2-dimethylhydrazine (DMH), must be oxidized in the body to have effect. The antioxidants, butylated hydroxyanisole (BHA) and ascorbic acid, were tested for efficacy in prevention of

6-Deoxy-6-[131I]iodo-L-ascorbic acid for the in vivo study of ascorbate: autoradiography, biodistribution in normal and hypolipidemic rats, and in tumor-bearing nude mice.

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Normal female rat distribution studies showed high and specific uptake of 6-deoxy-6-[(131)I]iodo-L-ascorbic acid (6-(131)IAsA) into the adrenal glands, known to highly express the ascorbate sodium-dependent vitamin C transporter-2 (SVCT-2), and the adrenal gland was clearly visualized by whole-body

Effect of ascorbic acid and alpha-tocopherol supplementations on serum leptin, tumor necrosis factor alpha, and serum amyloid A levels in individuals with type 2 diabetes mellitus.

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OBJECTIVE Diabetes mellitus Type 2 is one of the most widespread chronic metabolic diseases. In most cases, this type of diabetes is associated with alterations in levels of some inflammatory cytokines and hormones. Considering anti-inflammatory properties of plant extracts rich in ascorbic acid

Hormetic dose response to L-ascorbic acid as an anti-cancer drug in colorectal cancer cell lines according to SVCT-2 expression.

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L-Ascorbic acid (vitamin C, AA) exhibits anti-cancer effects with high-dose treatment through the generation of reactive oxygen species (ROS) and selective damage to cancer cells. The anti-cancer effects of L-ascorbic acid are determined by sodium-dependent vitamin C transporter 2 (SVCT-2), a

Ascorbic acid in the prevention and treatment of cancer.

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Proposed mechanisms of action for ascorbic acid (ascorbate, vitamin C) in the prevention and treatment of cancer include enhancement of the immune system, stimulation of collagen formation necessary for "walling off" tumors, inhibition of hyaluronidase which keeps the ground substance around the

Effects of N-acetyl-L-cysteine and ascorbic acid on mutagen-induced chromosomal sensitivity in patients with head and neck cancers.

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The protective effect of N-acetyl-L-cysteine (NAC) and ascorbic acid on mutagen-induced chromosomal breakage was determined using human lymphoblastoid cell lines as well as freshly cultured lymphocytes from patients with head and neck malignancies and healthy control subjects. Mutagen sensitivity

Helicobacter pylori-CagA seropositivity and nitrite and ascorbic acid food intake as predictors for gastric cancer.

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A hospital-based case-control study was carried out between 1994 and 1996 to evaluate the risk of gastric cancer (GC) according to Helicobacter pylori-CagA (+) seropositivity, nitrite and ascorbic acid intake. Three geographical areas of Mexico were selected on the basis of their contrasting dietary

[Ascorbic acid in the plasma and blood cells of women with breast cancer. The effect of the consumption of food with an elevated content of this vitamin].

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The levels of ascorbic acid in plasma and in blood cells (erythrocytes, neutrophils, and platelets) was studied in a group of 30 women with recent onset of breast cancer, and they were compared with a group of 30 healthy women, thus establishing the possible correlations between them. At the same

Further studies on n-nitrosopyrrolidine and its precursors: Effects of ascorbic acid and vitamin E on tumor development in mice as related to consumption of cured meat.

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Two experiments were carried out to ascertain if supplementation of a semipurified diet to Swiss-ICR mice with either ascorbic acid (AA), vitamin E (Vit E) or a combination of the two would modulate the carcinogenic effects of N-nitrosopyrrolidine (NPyr) and of its probable precursors (nitrite-N0(2)

Anti-metastatic effect of an autooxidation-resistant and lipophilic ascorbic acid derivative through inhibition of tumor invasion.

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The invasion of human fibrosarcoma HT-1080 cells through Matrigel was shown to be inhibited by pretreatment with ascorbic acid (Asc) or its four derivatives, such as Asc-6-O-palmitate (Asc6Plm), Asc-2-O-phosphate (Asc2P), Asc-2-O-phosphate-6-O-palmitate (Asc2P6Plm), and Asc-5,6-benzylidene

Effect of ascorbic acid on the intragastric environment in patients at increased risk of developing gastric cancer.

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Ascorbic acid has been shown to decrease nitrosation in vivo, and epidemiological data suggest that the consumption of foods rich in this vitamin is associated with a reduced risk for gastric cancer. In order to study this suggestion further, fasting gastric juice samples were obtained from 62

The role of ascorbic acid on collagen structure and levels of serum interleukin-6 and tumour necrosis factor-alpha in experimental lathyrism.

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Lathyrism is characterized by defective collagen synthesis due to inhibition of lysyl oxidase, an enzyme essential for interfibrillar cross-linking. The lathyritic agent beta-aminoproprionitrile (beta-APN) is considered an appropriate agent for studying connective tissue metabolism. We investigated

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