• Title/Summary/Keyword: Transformed cell

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Thioredoxin System and Redox Signaling; Defence against Stress and Toxicity

  • Yodoi, Junji;Masutani, Hiroshi;Nakamura, Hajime
    • Proceedings of the Korean Society of Toxicology Conference
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    • 2001.05a
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    • pp.84-88
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    • 2001
  • Human Thioredoxin (TRX) with with redox-active dithiol (C-C-Y-C-) in the active site has been cloned as adult T cell leukemia derived factor produced by HTLV-I transformed cells. Thioredoxin (TRX) is one of the major components of the thiol-reducing system and plays multiple roles in cellular processes such as proliferation, apoptosis and gene expression.(omitted)

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Eupatilin, A Pharmacologically Active Flavone Derived From Artemisia Plants, Inhibits Growth of H-Ras Transformed Human Breast Epithelial Cells Through Cell Cycle Arrest

  • Kim, Do-Hee;Na, Hye-Kyung;Surh, Young-Joon
    • Proceedings of the Korean Society of Toxicology Conference
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    • 2003.05a
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    • pp.89-90
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    • 2003
  • Extracts of Artemisia asiatica Nakai (Asteraceae) have been shown to have anti-inflammatory and anti-oxidative activities. Eupatilin (5,7-dihydroxy-3,4,6-tri-methoxy-flavone), one of the pharmacologically active ingredients derived from Artemisia asiatica, has been shown to induce apoptosis in promyelocytic leukemia (HL-60) cells. (omitted)

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ESTABLISHMENT OF IN VITRO BIOASSAY FOR TRANSFORMING GROWTH FACTOR (TGF-$\varepsilon$)

  • Kim, Mi-Sung;Ahn, Seong-Min;Aree Moon
    • Proceedings of the Korean Society of Toxicology Conference
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    • 2001.10a
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    • pp.201-201
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    • 2001
  • Transforming growth factor- $\beta$ (TGF- $\beta$), a hormonally active polypeptide found in normal and transformed tissue, is a potent regulator of cell growth and differentiation. In this study, we wished to establish an in vitro bioassay system to seek the most sensitive method that can measure TGF- $\beta$ activity.(omitted)

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Alterations in the Activities of Antioxidant Enzymes of Human Dermal Microvascular Endothelial Cells Infected with Orientia tsutsugamushi

  • Koh, Young-Sang
    • Journal of Microbiology
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    • v.39 no.2
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    • pp.142-145
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    • 2001
  • Changes in the Activities of several antioxidant enzymes in transformed human dermal microvascular endothelial Cells (HMEC-1) by infection with the obligate intracellular bacterium Orientia tsutsugamushi, the causative agent of scrub typhus, were investigated. The activities of glucose-6-phosphate dehydrogenase, catalase, and glutathione peroxidase were significantly decreased in HMEC-1 cells infected with Ο. tsutsugamushi. However, the level of superoxide dismutase increased slightly. Furthermore, Increased levels of intracellular peroxide was observed in HMEC-1 during infection. These results support the hypothesis that cells infected by this intracellular bacterium experience oxidant-mediated injury that may eventually contribute to cell death.

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INVOLVEMENT OF PHOSPHATIDYLINOSITOL 3-KINASE (PI3K) PATHWAY IN H-RAS-INDUCED INVASION AND MOTILITY OF HUMAN BREAST EPITHELIAL CELLS

  • Shin, Il-Chung;Aree Moon
    • Proceedings of the Korean Society of Toxicology Conference
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    • 2002.11b
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    • pp.142-142
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    • 2002
  • Many studies have identified the phosphatidylinositol 3-kinase (PI3K) as a key regulator for various cellular functions including cell survival, growth and motility. We have previously shown that H-ras, but not N-ras, induces invasiveness and motility in human breast epithelial cells (MCF10A), while both H-ras and N-ras induce transformed phenotype.(omitted)

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Roles of Phosphatidylinositol 3-Kinase(PI3K) and Rac1

  • Shin, Il-Chung;Kim, Seon-Hoe;Moon, A-Ree
    • Proceedings of the PSK Conference
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    • 2003.04a
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    • pp.223.1-223.1
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    • 2003
  • Many studies have identified the phosphatidylinositol 3-kinase (PI3K) as a key regulator for various cellular functions including cell survival, growth and motility. We have previously shown that H-ras, but not N-ras. induces invasiveness and motility in human breast epithelial cells (MCF10A), while both H-ras and N-ras induce transformed phenotype. In the present study, we wished to investigate the functional role of PI3K pathway in H-ra-induced invasive phenotype and motility of MCF10A cells. (omitted)

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