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Laminarin Induces Apoptosis of Human Colon Cancer LOVO Cells through a Mitochondrial Pathway
Engineering Research Center of Natural Anticancer Drugs, Ministry of Education, Harbin University of Commerce, Harbin 150076, China
Center of Research on Life Science and Environmental Science, Harbin University of Commerce, Harbin 150076, China
* Author to whom correspondence should be addressed.
Received: 21 July 2012; in revised form: 11 August 2012 / Accepted: 14 August 2012 / Published: 20 August 2012
Abstract: Many scientific studies have shown that laminarin has anti-tumor effects, but the anti-tumor mechanism was unclear. The purpose of this study was to investigate the effect of laminarin on the induction of apoptosis in human colon cancer LOVO cells and the molecular mechanism involved. LOVO cells were treated with different concentrations of laminarin at different times. Morphology observations were performed to determine the effects of laminarin on apoptosis of LOVO cells. Flow cytometry (FCM) was used to detect the level of intracellular reactive oxygen species (ROS) and pH. Laser scanning confocal microscope (LSCM) was used to analyze intracellular calcium ion concentration, mitochondrion permeability transition pore (MPTP) and mitochondrial membrane potential (MMP). Western blotd were performed to analyze the expressions of Cyt-C, Caspase-9 and -3. The results showed the apoptosis morphology, which showed cell protuberance, concentrated cytoplasm and apoptotic bodies, was obvious after 72 h treatment. Laminarin treatment for 24 h increased the intracellular level of ROS and Ca2+; decreased pH value; activated intracellular MPTP and decreased MMP in dose-dependent manners. It also induced the release of Cyt-C and the activation of Caspase-9 and -3. In conclusion, laminarin induces LOVO cell apoptosis through a mitochondrial pathway, suggesting that it could be a potent agent for cancer prevention and treatment.
Keywords: laminarin; human colon cancer; apoptosis; mitochondrial pathway
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MDPI and ACS Style
Ji, Y.B.; Ji, C.F.; Zhang, H. Laminarin Induces Apoptosis of Human Colon Cancer LOVO Cells through a Mitochondrial Pathway. Molecules 2012, 17, 9947-9960.
Ji YB, Ji CF, Zhang H. Laminarin Induces Apoptosis of Human Colon Cancer LOVO Cells through a Mitochondrial Pathway. Molecules. 2012; 17(8):9947-9960.
Ji, Yu Bin; Ji, Chen Feng; Zhang, He. 2012. "Laminarin Induces Apoptosis of Human Colon Cancer LOVO Cells through a Mitochondrial Pathway." Molecules 17, no. 8: 9947-9960.