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Growth Inhibitory Activity of Honokiol through Cell-cycle Arrest, Apoptosis and Suppression of Akt/mTOR Signaling in Human Hepatocellular Carcinoma Cells  

Hong, Ji-Young (College of Pharmacy, Seoul National University)
Park, Hyen Joo (College of Pharmacy, Seoul National University)
Bae, KiHwan (College of Pharmacy, Chungnam National University)
Kang, Sam Sik (College of Pharmacy, Seoul National University)
Lee, Sang Kook (College of Pharmacy, Seoul National University)
Publication Information
Natural Product Sciences / v.19, no.2, 2013 , pp. 155-159 More about this Journal
Abstract
Honokiol, a naturally occurring neolignan mainly found in Magnolia species, has exhibited a potential anti-proliferative activity in human cancer cells. However, the growth inhibitory activity against hepatocellular carcinoma cells and the underlying molecular mechanisms has been poorly determined. The present study was designed to examine the anti-proliferative effect of honokiol in SK-HEP-1 human hepatocellular cancer cells. Honokiol exerted anti-proliferative activity with cell-cycle arrest at the G0/G1 phase and sequential induction of apoptotic cell death. The cell-cycle arrest was well correlated with the down-regulation of checkpoint proteins including cyclin D1, cyclin A, cyclin E, CDK4, PCNA, retinoblastoma protein (Rb), and c-Myc. The increase of sub-G1 peak by the higher concentration of honokiol ($75{\mu}M$) was closely related to the induction of apoptosis, which was evidenced by decreased expression of Bcl-2, Bid, and caspase-9. Hohokiol was also found to attenuate the activation of signaling proteins in the Akt/mTOR and ERK pathways. These findings suggest that the anti-proliferative effect of honokiol was associated in part with the induction of cell-cycle arrest, apoptosis, and dow-nregulation of Akt/mTOR signaling pathways in human hepatocellular cancer cells.
Keywords
Honokiol; G0/G1 Cell-cycle arrest; Apoptosis; Akt/mTOR; SK-HEP-1 cells;
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