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http://dx.doi.org/10.5352/JLS.2006.16.4.691

Regulation of Phospholipase D by CoCl2 in Human Glioblastoma Cells  

Lee, Seung-Hoon (Department of Molecular Biology, Pusan National University)
Min, Gye-Sik (Department of Microbiological Engineering, Jinju National University)
Min, Do-Sik (Department of Molecular Biology, Pusan National University)
Publication Information
Journal of Life Science / v.16, no.4, 2006 , pp. 691-698 More about this Journal
Abstract
Phospholipase D (PLD) is known to play an important role in a variety of cells. However, little is known about $CoCl_2-mediated$ PLD signaling. In this study we demonstrated for the first time that $CoCl_2$ stimulates PLD activity and increases expression of cyclooxygenase-2 (COX-2), which is known to mediate inflammatory reaction. $CoCl_2-induced$ PLD activity was assessed by measuring the formation of $[^3H]$ phosphatidylbutanol (PtdBut), the product of PLD-mediated transphosphatidylation, in the presence of 1-butanol. To study mechanism of PLD signaling induced by $CoCl_2$, U87 human glioblastoma cells were stimulated by $CoCl_2$ and regulators of PLD activity induced by $CoCl_2$ were investigated using several inhibitors of signaling proteins. Moreover, PLD activation by $CoCl_2$ increased not only expression of COX-2 protein but also COX-2 promoter activity. In summary, these results suggest that $CoCl_2$ increases expression of COX-2 protein via PLD in human U87 glioblastoma cells.
Keywords
$CoCl_2$; phospholipase D; glioma; COX-2;
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