Regulation of the exopolysaccharide from an anamorph of Cordyceps sinensis on dendritic cell sarcoma (DCS) cell line.

Abstract:

PURPOSE:Cordyceps sinensis has been regarded as a precious tonic food and herbal medicine in China for thousands of years. The exopolysaccharide (EPS) from an anamorph of Cordyceps sinensis was found to have antitumor immunomodulatory activity. Mature dendritic cells play a role in initiating antitumor immunity, so we try to investigate the effects of EPS on the murine dendritic cell line DCS. METHODS:Flow cytometry was used to assay the expression levels of cell surface molecules including major histocompatibility complex (MHC)-II, CD40, CD80, and CD86 of DCS cells and their ability to take up antigens. The ability of DCS cells to activate the proliferation of CTLL-2 T cells was measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) method. IL-12 and TNF-α levels were detected using ELISA. Western blotting was performed to estimate the levels of phosphorylated Janus kinase 2 (p-JAK2), phosphorylated signal transducer and activator of transcription 3 (p-STAT3), nuclear factor-κB (NF-κB) p65 and p105. RESULTS:EPS increased the expressions of MHC-II, CD40, CD80, and CD86 of DCS cells and up-regulated their ability to take up antigens. EPS also enhanced their ability to activate the proliferation of CTLL-2 T cells. IL-12 and TNF-α secreted from DCS cells were up-regulated after EPS treatment. Furthermore, EPS significantly caused the decline of p-JAK2 and p-STAT3, significantly increased levels of NF-κB p65 in the nucleus and decreased levels of NF-κB p105 in the cytoplasm. CONCLUSIONS:EPS may induce DCS cells to exhibit mature characteristics, and the mechanism involved is probably related to the inhibition of the JAK2/STAT3 signal pathway and promotion of the NF-κB signal pathway.

journal_name

Eur J Nutr

authors

Song D,He Z,Wang C,Yuan F,Dong P,Zhang W

doi

10.1007/s00394-012-0373-x

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

687-94

issue

2

eissn

1436-6207

issn

1436-6215

journal_volume

52

pub_type

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