Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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Extracellular Signal-Regulated Kinase Is a Major Enzyme in Korean Mistletoe Lectin-Mediated Regulation of Macrophage Functions

  • Byeon, Se-Eun (School of Bioscience and Biotechnology, and Institute of Bioscience and Biotechnology, Kangwon National University) ;
  • Lee, Jae-Hwi (College of Pharmacy, Chung-Ang University) ;
  • Yu, Tao (School of Bioscience and Biotechnology, and Institute of Bioscience and Biotechnology, Kangwon National University) ;
  • Kwon, Moo-Sik (Department of Genetic Engineering, Sungkyunkwan University) ;
  • Hong, Sung-Youl (Department of Genetic Engineering, Sungkyunkwan University) ;
  • Cho, Jae-Youl (School of Bioscience and Biotechnology, and Institute of Bioscience and Biotechnology, Kangwon National University)
  • Published : 2009.07.31
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Abstract

Korean mistletoe lectin (KML) is the major component found in Viscum album var. (coloratum), displaying anti-cancer and immunostimulating activities. Even though it has been shown to boost host immune defense mechanisms, the regulatory roles of KML on the functional activation of macrophages have not been fully elucidated. In this study, regulatory mechanism of KML on macrophage-mediated immune responses was examined in terms of KML-mediated signaling event. KML clearly induced mRNA expression of tumor necrosis factor (TNF)-$\alpha$, the generation of reactive oxygen species (ROS) and phagocytic uptake in RAW264.7 cells. All of these events were strongly suppressed by U0126, whereas TNF-$\alpha$ mRNA was not diminished by SB203580 and SP600125, indicating ERK as a central enzyme managing KML-induced up-regulation of macrophage functions. Indeed, KML strongly induced the phosphorylation of ERK in a time-dependent manner without altering its total level. Therefore, these data suggest that ERK may be a major signaling enzyme with regulatory property toward various KML-mediated macrophage responses.

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References

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