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Estrogens and genomic instability in human breast cancer cells--involvement of Src/Raf/Erk signaling in micronucleus formation by estrogenic chemicals.

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Reports of the ability of estrogenic agents such as 17beta-estradiol (E2), estriol (E3) and bisphenol A (BPA) to induce micronuclei (MN) in MCF-7 breast cancer cells have prompted us to investigate whether these effects are linked to activation of the estrogen receptor (ER) alpha. Coadministration

Synthesis and Anti-cancer Activity of Novel Thiazolidinone Analogs of 6-Aminoflavone.

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Novel heterocyclic analogs were synthesized by combining a flavone nucleus and thiazolidinone ring in an effort to potentiate the existing anti-cancer activity of flavone. The syntheses of 6-aminoflavone, 6-amino-3-methoxyflavone, 6-amino-3-methoxy-3',4'-dimethxyflavone and their corresponding

Enhancement of peripheral benzodiazepine receptor ligand-induced apoptosis and cell cycle arrest of esophageal cancer cells by simultaneous inhibition of MAPK/ERK kinase.

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Specific ligands of the peripheral benzodiazepine receptor (PBR) activate pro-apoptotic and anti-proliferative signaling pathways. Previously, we found that PBR ligands activated the p38 mitogen-activated protein kinase (MAPK) pathway in esophageal cancer cells, and that the activation of p38MAPK

Flavonoid constituents of Chorizanthe diffusa with potential cancer chemopreventive activity.

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An ethyl acetate-soluble extract of Chorizanthe diffusa was found to exhibit significant antioxidant activity, as judged by scavenging stable 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radicals and inhibition of 12-O-tetradecanoylphorbol 13-acetate (TPA)-induced free radical formation with cultured

Activation of nonsteroidal anti-inflammatory drug-activated gene-1 via extracellular signal-regulated kinase 1/2 mitogen-activated protein kinase revealed a isochaihulactone-triggered apoptotic pathway in human lung cancer A549 cells.

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The novel lignan isochaihulactone inhibits cell proliferation and is an effective inducer of apoptosis in a variety of carcinoma cell lines. To determine the mechanisms underlying these effects, we examined isochaihulactone-induced changes in gene expression using oligodeoxynucleotide-based

The chemopreventive agent curcumin is a potent radiosensitizer of human cervical tumor cells via increased reactive oxygen species production and overactivation of the mitogen-activated protein kinase pathway.

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Cervical cancer is the second most common malignancy among women worldwide and is highly radioresistant, often resulting in local treatment failure. For locally advanced disease, radiation is combined with low-dose chemotherapy; however, this modality often leads to severe toxicity. Curcumin, a

Effect of erythromycin on biological activities induced by clostridium perfringens alpha-toxin.

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Clostridium perfringens alpha-toxin, an important agent of gas gangrene with inflammatory myopathies, possesses lethal, hemolytic, and necrotic activities. Here, we show that alpha-toxin-induced lethality in mice was inhibited by i.v. preadministration of erythromycin (ERM). Administration of ERM

Bioavailable flavonoids: cytochrome P450-mediated metabolism of methoxyflavones.

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Methoxylated flavones were recently shown to be promising cancer chemopreventive agents. Their high metabolic stability compared with the hydroxylated analogs was shown in our laboratory using the human hepatic S9 fraction with cofactors for glucuronidation, sulfation, and oxidation. In the present

Peroxisome proliferator-activated receptor-gamma activator 15-deoxy-Delta12,14-prostaglandin J2 inhibits neuroblastoma cell growth through induction of apoptosis: association with extracellular signal-regulated kinase signal pathway.

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Peroxisome proliferator-activated receptor-gamma (PPAR-gamma) ligands have been demonstrated to inhibit growth of several cancer cells. Here, we investigated whether one of the PPAR-gamma ligands, 15-deoxy-Delta12,14-prostaglandin J2 (15-deoxy-PGJ2) inhibits cell growth of two human neuroblastoma

Characterization of a human carcinoma cell line selected for resistance to the farnesyl transferase inhibitor 4-(2-(4-(8-chloro-3,10-dibromo-6,11-dihydro-5H-benzo-(5,6)-cyclohepta(1,2-b)-pyridin-11(R)-yl)-1-piperidinyl)-2-oxo-ethyl)-1-piperidinecarboxamide (SCH66336).

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Farnesyl protein transferase inhibitors (FTIs) have demonstrated clinical activity in certain solid tumors and hematological malignancies. Little is known about mechanisms of resistance to these agents. To provide a basis for better understanding FTI resistance, the colorectal carcinoma cell line

High-dose acetaminophen inhibits the lethal effect of doxorubicin in HepG2 cells: the role of P-glycoprotein and mitogen-activated protein kinase p44/42 pathway.

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Doxorubicin (DOX) is a widely used chemotherapeutic drug for human hepatocellular carcinoma (HCC). A major limitation to its effectiveness is the development of multidrug resistance of cancer cells. In clinical trials, patients with advanced HCC were treated with high-dose acetaminophen (HAAP) in an

Transcriptional regulation of activating transcription factor 3 involves the early growth response-1 gene.

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Previously, our laboratory identified activating transcription factor 3 (ATF3) as up-regulated by nonsteroidal anti-inflammatory drugs using microarray analysis of mRNA from human colorectal cancer cells treated with sulindac sulfide. ATF3 is a transcription factor involved in cell growth,

Bioassay-guided isolation of cytotoxic flavonoids from aerial parts of Coronopus didymus.

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BACKGROUND Coronopus didymus Linn. (Brassicaceae) is a medicinal plant used traditionally as antipyretic, expectorant, to purify blood and for alleviating symptoms of pain, inflammations, malaria, wounds and cancer. OBJECTIVE The present study was designed to isolate and identify the cytotoxic

Antagonistic effect of flavonoids on NSC-741909-mediated antitumor activity via scavenging of reactive oxygen species.

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NSC-741909 (1-[(4-chlorophenyl)methyl]-1H-Indole-3-methanol) is a novel anticancer agent that is highly active against several NCI-60 cancer cell lines. This agent induces sustained activation of mitogen-activated protein kinases (MAPK), including JNK and p38 MAP kinases. However, the mechanisms of

Induction of manganese-superoxide dismutase by YS 51, a synthetic 1-(beta-naphtylmethyl)6,7-dihydroxy- 1,2,3,4-tetrahydroisoquinoline alkaloid: implication for anti-inflammatory actions.

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The effect of YS 51, a synthetic 1-(beta-naphtylmethyl)6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline alkaloid, on the expression of manganese-superoxide dismutase (Mn-SOD), an antioxidant enzyme, was examined in sheep pulmonary artery endothelial cells (SPAEC) and a human cervical carcinoma cell line

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