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ORIGINAL RESEARCH ARTICLE

Inhibitory Effects of Lycopene on the Adhesion, Invasion, and Migration of SK-Hep1 Human Hepatoma Cells

School of Agricultural Biotechnology and Center for Agricultural Biomaterials, College of Agriculture and Life Sciences, Seoul National University, San 56–1, Shillim-dong, Gwanak-gu 151–742, Korea

To whom requests for reprints should be addressed at ¹ Department of Food Science and Technology, School of Agricultural Biotechnology and Center for Agricultural Biomaterials, College of Agriculture and Life Sciences, Seoul National University, San 56–1, Shillim-dong, Gwanak-gu, Seoul 151–742, Republic of Korea. E-mail: leehyjo{at}snu.ac.kr

Lycopene, which is the predominant carotenoid in tomatoes and tomato-based foods, may protect humans against various cancers. Effects of lycopene on the adhesion, invasion, migration, and growth of the SK-Hep1 human hepatoma cell line were investigated. Lycopene inhibited cell growth in dose-dependent manners, with growth inhibition rates of 5% and 40% at 0.1 µM and 50 µM lycopene, respectively, after 24 hrs of incubation. Similarly, after 48 hrs of incubation, lycopene at 5 µM and 10 µM decreased the cell numbers by 30% and 40%, respectively. Lycopene decreased the gelatinolytic activities of both matrix metalloproteinase (MMP)-2 and MMP-9, which were secreted from the SK-Hep1 cells. Incubation of SK-Hep1 cells with 110 µM of lycopene for 60 mins significantly inhibited cell adhesion to the Matrigel-coated substrate in a concentration-dependent manner. To study invasion, SK-Hep1 cells were grown either on Matrigel-coated Transwell membranes or in 24-well plates. The cells were treated sequentially for 24 hrs with lycopene before the start of the invasion assays. Cell growth and death were assessed under the same conditions. The invasion of SK-Hep1 cells treated with lycopene was significantly reduced to 28.3% and 61.9% of the control levels at 5 µM and 10 µM lycopene, respectively (P < 0.05). In the migration assay, lycopene-treated cells showed lower levels of migration than untreated cells. These results demonstrate the antimetastatic properties of lycopene in inhibiting the adhesion, invasion, and migration of SK-Hep1 human hepatoma cells.

Key Words: lycopene • SK-Hep1 cell • liver cancer • matrix metalloproteinase • adhesion • invasion • migration • metastasis • extracellular matrix

This article has been cited by other articles:

				C.-S. Huang, J.-W. Liao, and M.-L. Hu Lycopene Inhibits Experimental Metastasis of Human Hepatoma SK-Hep-1 Cells in Athymic Nude Mice J. Nutr., March 1, 2008; 138(3): 538 - 543. [Abstract] [Full Text] [PDF]