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http://dx.doi.org/10.7314/APJCP.2012.13.4.1177

Suppressive Effect of Maslinic Acid on PMA-induced Protein Kinase C in Human B-Lymphoblastoid Cells  

Mooi, Lim Yang (Department of Pre-clinical Science, Faculty of Medicine and Health Sciences, Universiti Tunku Abdul Rahman)
Yew, Wong Teck (Department of Pre-clinical Science, Faculty of Medicine and Health Sciences, Universiti Tunku Abdul Rahman)
Hsum, Yap Wei (Faculty of Science, Jalan Universiti)
Soo, Khoo Kong (Faculty of Science, Jalan Universiti)
Hoon, Lim Saw (School of Biological Sciences, Faculty of Science, Monash University Victoria)
Chieng, Yeo Chew (Faculty of Agriculture and Biotechnology, Universiti Sultan Zainal Abidin)
Publication Information
Asian Pacific Journal of Cancer Prevention / v.13, no.4, 2012 , pp. 1177-1182 More about this Journal
Abstract
Protein kinase C (PKC) has been implicated in carcinogenesis and displays variable expression profiles during cancer progression. Studies of dietary phytochemicals on cancer signalling pathway regulation have been conducted to search for potent signalling regulatory agents. The present study was designed to evaluate any suppressive effect of maslinic acid on PKC expression in human B-lymphoblastoid cells (Raji cells), and to identify the PKC isoforms expressed. Effects of maslinic acid on PKC activity were determined using a PepTag$^{(R)}$ assay for non-radioactive detection of PKC. The highest expression in Raji cells was obtained at 20 nM PMA induced for 6 hours. Suppressive effects of maslinic acid were compared with those of four PKC inhibitors (H-7, rottlerin, sphingosine, staurosporine) and two triterpenes (oleanolic acid and ursolic acid). The $IC_{50}$ values achieved for maslinic acid, staurosporine, H-7, sphingosine, rottlerin, ursolic acid and oleanolic acid were 11.52, 0.011, 0.767, 2.45, 5.46, 27.93 and $39.29\;{\mu}M$, respectively. Four PKC isoforms, PKC ${\beta}I$, ${\beta}II$, ${\delta}$, and ${\zeta}$, were identified in Raji cells via western blotting. Maslinic acid suppressed the expression of PKC ${\beta}I$, ${\delta}$, and ${\zeta}$ in a concentration-dependent manner. These preliminary results suggest promising suppressive effects of maslinic acid on PKC activity in Raji cells. Maslinic acid could be a potent cancer chemopreventive agent that may be involved in regulating many downstream signalling pathways that are activated through PKC receptors.
Keywords
Protein kinase C; maslinic acid; Raji cell s; PMA; cancer chemoprevention;
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