• Title, Summary, Keyword: lectin

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Macrophage and Anticancer Activities of Feed Additives on β-Glucan from Schizophyllum commune in Breast Cancer Cells (치마버섯균 유래의 베타글루칸에 대한 사료첨가제로서의 대식세포 기능 활성 및 유방암 세포주에서의 항암효능 효과)

  • Lee, Jin-Seok;Lee, Seung-Ho;Jang, Yong-Man;Lee, Jong-Dae;Lee, Byoung-Hee;Jung, Ji-Youn
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.40 no.7
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    • pp.949-955
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    • 2011
  • [ ${\beta}$ ]Glucan is a polysaccharide expressed on the cell walls of fungi. It is known that ${\beta}$-glucan is recognized by a family of C-type lectin receptors, dectin-1, which is expressed mainly on myeloid immune cells, including macrophages, neutrophils and dendritic cells. Raw 264.7 cells were treated with ${\beta}$-glucan from Schizophyllum commune. ${\beta}$-Glucan was not cytotoxic up to 400 ${\mu}g$/mL as measured by MTT assay. To measure the activity of macrophages, NO and TNF-${\alpha}$ assays were performed in Raw 264.7 cells. Treatment with ${\beta}$-glucan for 24 hr significantly increased production of NO and TNF-${\alpha}$ compared with control groups (p<0.05), indicating activation of macrophages. To measure inhibition of breast cancer cell proliferation, MTT assay was performed in MDA-MB-231 cells. Cell viability was significantly decreased in the group treated with 400 ${\mu}g$/mL of ${\beta}$-glucan for 48 hr (p<0.05) compared to the control group. However, tumor volume was decreased in the groups administered 200 ${\mu}g$ of ${\beta}$-glucan/mouse compared to the control group. These results indicate that ${\beta}$-glucan inhibits breast cancer cell growth through the induction of apoptosis.

Effect of Clonorchis sinensis Excretory-secretory Product on the Cultured SD Rat Bile Duct Fibroblast (배양된 흰쥐 담관 섬유모세포에 대한 간흡충 분비배설 물질의 영향)

  • Kwon, Jung-Nam;Min, Byoung-Hoon;Lee, Haeng-Sook;Kim, Soo-Jin;Joo, Kyoung-Hwan
    • Applied Microscopy
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    • v.39 no.2
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    • pp.117-124
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    • 2009
  • Clonorchis sinensis is the most important widely distributed parasite of the human bile duct in East Asia and the most prevalent parasitic helminth in Korea. The prevalence rate of human clonorchiasis has remained at about 2.9% in Korea. C. sinensis induces dilatation of the duct, hyperplasia of the mucosa, metaplasia or neoplasia of the mucosal epithelium, periductal inflammation and fibrosis, and thickening of the ductal wall. Fibroblast are the most common cells in connective tissue and are responsible for the synthesis of extracellular matrix components. The fibrosis associated with chronic inflammation and injury may also contribute to cholangiocarcinoma pathogenesis, particularly through an increase in extracellular matrix components, which participate in the regulation of bile duct differentiation during development. In this study, ultrastructural changes, the distribution of lectin receptors and actin protein in cultured SD rat bile duct fibroblast after infection of C. sinensis were observed. Experimental group had been divided into four groups: normal bile duct fibroblast cultured in basal media (G1); C. sinensis infected bile duct fibroblast cultured in basal media (G2); normal bile duct fibroblast cultured in basal media containing excretory-secretory product (ESP) (G1-1); C. sinensis infected bile duct fibroblast cultured in basal media containing ESP (G2-1). Overall, once a host is infected by C. sinensis, it affects the host to the extent that sialic acid of ductal fibroblast is increased. Number of cytoplasmic process of SD rat bile duct fibroblast was increased. Actin protein and sialic acid were located in cell surface. Fibroblast induced by C. sinensis was not recovered to normal fibroblast. The cytoplasm bulk and cytoplasmic process were increased whereas the growth rate of the fibroblast of infected SD rat was reduced rather than that of normal fibroblast. In result, it inhibits fibroblast proliferation and increases actin protein on fibroblast cytoplasm, and so causes fibroblast metamorphosis and cellular mutation.