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http://dx.doi.org/10.5483/BMBRep.2010.43.11.750

Effects of polysaccharides derived from Orostachys japonicus on induction of cell cycle arrest and apoptotic cell death in human colon cancer cells  

Ryu, Deok-Seon (Department of Smart Foods and Drugs Supported by the Second Stage BK21 Project of Korea Research Foundation, Inje University)
Baek, Geum-Ok (Department of Biomedical Laboratory Science, Inje University)
Kim, Eun-Young (Department of Biomedical Laboratory Science, Inje University)
Kim, Ki-Hoon (Department of Biomedical Laboratory Science, Inje University)
Lee, Dong-Seok (Department of Smart Foods and Drugs Supported by the Second Stage BK21 Project of Korea Research Foundation, Inje University)
Publication Information
BMB Reports / v.43, no.11, 2010 , pp. 750-755 More about this Journal
Abstract
Crude Orostachys japonicus polysaccharide extract (OJP) was prepared by hot steam extraction. Polysaccharides (OJPI) were separated from OJP by gel filtration chromatography and phenol-sulfuric acid assay. The average molecular weight of the OJPI was 30-50 kDa. The anti-proliferative effect of OJPI on HT-29 human colon cancer cells was investigated via morphology study, cell viability assay, apoptosis assay, cell cycle analysis, and cDNA microarray. OJPI inhibited proliferation and growth of HT29 cells and also stimulated apoptosis in a dose- and time-dependent manner. In cell cycle analysis, treatment with OJPI resulted in a marked increase of cells in the G0 (sub G1) and G2/M phases. To screen for genes involved in the induction of cell cycle arrest and apoptosis, the gene expression profiles of HT-29 cells treated with OJPI were examined by cDNA microarray, revealing that a number of genes were up- or down-regulated by OJPI. Whereas several genes involved in anti-apoptosis, cell proliferation and growth, and cell cycle regulation were down-regulated, expression levels of several genes involved in apoptosis, tumor suppression, and other signal transduction events were up-regulated. These results suggest that OJPI inhibits the growth of HT-29 human colon cancer cells by various apoptosis-aiding activities as well as apoptosis itself. Therefore, OJPI deserve further development as an effective agent exhibiting anticancer activity.
Keywords
Anti-proliferative activity; Apoptosis; Cell cycle arrest; Microarray; Orostachys japonicus; Polysaccharides;
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Times Cited By Web Of Science : 4  (Related Records In Web of Science)
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