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Study on the Anti-HT-29 Human Colon Cancer Activity of $\beta$-Glucans and Their Enzymatically Hydrolyzed Oligosaccharides from Agalicus blazei Murill  

Lee, Mi-Young (Department of Biomedical Laboratory Science and Biohealth Products Research Center, Inje University)
Kim, Ki-Hoon (Department of Biomedical Laboratory Science and Biohealth Products Research Center, Inje University)
Kim, Yea-Woon (Department of Biomedical Laboratory Science and Biohealth Products Research Center, Inje University)
Chang, Hun-Gil (Department of Biomedical Laboratory Science and Biohealth Products Research Center, Inje University)
Lee, Dong-Seok (Department of Biomedical Laboratory Science and Biohealth Products Research Center, Inje University)
Publication Information
Korean Journal of Microbiology / v.42, no.4, 2006 , pp. 319-325 More about this Journal
Abstract
[ $\beta$ ]-Glucans (AG) were prepared from Agaricus blazei cultured in the medium fortified with the roots of Pueraria spp. by repeated extraction with hot water, gel filtration chromatography and DEAE ion exchange chromatography. Oligosaccharides (AO) were derived from the hydrolysis of AG by an endo-$\beta$-(1$\rightarrow$6)-glucanase from Bacillus megaterium. The anti-HT-29 human colon cancer activity of AG or AO was investigated using MTT assay, apoptosis assay, cell cycle analysis, and cDNA microairay. AG and AO both inhibited proliferation and growth of HT-29 cells, and stimulated apoptosis of the cells in a dose-dependent manner. In cell cycle analysis, treating HT-29 cells with AG or AO resulted in the increase of cells in the G0 (sub-G1) and G1 phase. Especially, AO was more effective in inducing G0/G1 cell cycle arrest than AG. To screen the genes involved in the increase of apoptosis, the gene expression profile of the HT-29 cells treated with AO was examined by cDNA microarray. While several genes involved in cell cycle progression (CCND2 and CDK2) were down-regulated, many genes involved in apoptosis (TNFSF9, TNFRSF9, FADD, CASP8, BAD, CRADD, CASP9 etc), cell cycle inhibitor (CDKN2A), immune response (IL6, IL18, IL6R etc), and tumor suppressor (CEACAM1, TP53BP2, IRF1, and PHB) were up-regulated. These results suggest that AO could inhibit the proliferation and growth of HT-29 cells by G0/G1 cell cycle arrest and induction of apoptosis.
Keywords
Agaricus blazei; anti-cancer activity; apoptosis; cDNA microarray; cell cycle; $\beta$-Glucans; HT-29; oligosaccharides;
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