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http://dx.doi.org/10.5352/JLS.2003.13.5.551

Phospholipase D Activity is Elevated in Hepatitis C Virus Core Protein-Transformed NIH 3T3 Mouse Fibroblast Cells  

Kim, Joonmo (Department of Physiology, College of Medicine, The Catholic University of Korea)
Jung, Eun-Young (Department of Microbiology, College of Natural Sciences, Pusan National University)
Jang, Kyung-Lib (Department of Microbiology, College of Natural Sciences, Pusan National University)
Min, Do-Sik (Department of Physiology, College of Medicine, The Catholic University of Korea)
Publication Information
Journal of Life Science / v.13, no.5, 2003 , pp. 551-558 More about this Journal
Abstract
Hepatitis C Virus (HCV) is associated with a severe liver disease and increased frequency in the development of hepatocellular carcinoma. Overexpression of HCV core protein is known to transform fibroblast cells. Phospholipase D (PLD) activity is commonly elevated in response to mitogenic signals, and PLD has been also reported to be overexpressed and hyperactivated in some human cancer. The aim of this study was to understand how PLD can be regulated in HCV core protein-transformed NIH3T3 mouse fibroblast cells. We observed that in unstimulated state, basal PLD activity was higher in NIH3T3 cells overexpressing HCV core protein than in vector-transfected cells. Although expression of PLD and protein kinase C (PKC) in core protein-transformed cells was similar with that of control cells, phorbol 12-myristate 13-acetate (PMA), which is known to activate PKC, stimulated significantly PLD activity in core protein-transformed cells, compared with that of the control cells. PLD activity assay using PKC isozyme-specific inhibitor, and PKC translocation experiment showed that PKC-$\delta$ was mainly involved in the PMA-induced PLD activation in the core-transformed cells. Taken together, these results suggest that PLD might be implicated in core protein-induced transformation.
Keywords
PLD; HCV core; PKC;
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