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http://dx.doi.org/10.4196/kjpp.2009.13.5.401

Arachidonic Acid Activates $K^+$-$Cl^-$-cotransport in HepG2 Human Hepatoblastoma Cells  

Lee, Yong-Soo (College of Pharmacy, Duksung Women's University)
Publication Information
The Korean Journal of Physiology and Pharmacology / v.13, no.5, 2009 , pp. 401-408 More about this Journal
Abstract
$K^+$-$Cl^-$-cotransport (KCC) has been reported to have various cellular functions, including proliferation and apoptosis of human cancer cells. However, the signal transduction pathways that control the activity of KCC are currently not well understood. In this study we investigated the possible role of phospholipase $A_2$ ($PLA_2$)-arachidonic acid (AA) signal in the regulatory mechanism of KCC activity. Exogenous application of AA significantly induced $K^+$ efflux in a dose-dependent manner, which was completely blocked by R-(+)-[2-n-butyl-6,7 -dichloro-2-cyclopentyl-2,3-dihydro-1-oxo-1Hinden-5-yl]oxy]acetic acid (DIOA), a specific KCC inhibitor. N-Ethylmaleimide (NEM), a KCC activatorinduced $K^+$ efflux was significantly suppressed by bromoenol lactone (BEL), an inhibitor of the calciumindependent $PLA_2$ ($iPLA_2$), whereas it was not significantly altered by arachidonyl trifluoromethylketone ($AACOCF_3$) and p-bromophenacyl bromide (BPB), inhibitors of the calcium-dependent cytosolic $PLA_2$ ($cPLA_2$) and the secretory $PLA_2$ ($sPLA_2$), respectively. NEM increased AA liberation in a doseand time-dependent manner, which was markedly prevented only by BEL. In addition, the NEM-induced ROS generation was significantly reduced by DPI and BEL, whereas $AACOCF_3$ and BPB did not have an influence. The NEM-induced KCC activation and ROS production was not significantly affected by treatment with indomethacin (Indo) and nordihydroguaiaretic acid (NDGA), selective inhibitors of cyclooxygenase (COX) and lipoxygenase (LOX), respectively. Treatment with 5,8,11,14-eicosatetraynoic acid (ETYA), a non-metabolizable analogue of AA, markedly produced ROS and activated the KCC. Collectively, these results suggest that $iPLA_2$-AA signal may be essentially involved in the mechanism of ROS-mediated KCC activation in HepG2 cells.
Keywords
$K^+$-$Cl^-$-cotransport; Reactive oxygen species; Arachidonic acid; Phospholipase $A_2$; N-Ethylmaleimide; HepG2 cells;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By Web Of Science : 2  (Related Records In Web of Science)
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