Abstract: Polysaccharides play a key role in enhancing immune function and facilitating cellular communication. Here, we purified Nymphaea rubra Roxb. polysaccharides (NR-PS) by treating them with pullulanase. They were then cultured with immature dendritic cells (DCs) derived from rat bone marrow hematopoietic cells (BMHCs). After treatment with bioactive NR-PS with a degree of polymerization (DP) value of 359.8, we found that the DCs underwent morphological changes indicative of activation. CD80/86 (87.16% ± 8.49%) and MHC class II (52.01% ± 10.11%) expression levels were significantly up-regulated by this treatment compared to the controls (65.45% ± 0.97% and 34.87% ± 1.96%). In parallel, endocytosis was also reduced (167.94% ± 60.59%) after treatment with 25 μg/mL of NR-PS as measured by the medium fluorescence intensity compared to the control (261.67% ± 47.26%). Furthermore, the DCs after treatment with 25 μg/mL NR-PS showed increased IL-12 (102.09 ± 10.16 to 258.78 ± 25.26 pg/mL) and IFN-γ (11.76 ± 0.11 to 15.51 ± 1.66 pg/mL) secretion together with reduced IL-10 secretion (30.75 ± 3.35 to 15.37 ± 2.35 pg/mL), which indicates a TH1 immune response. In conclusion, NR-PS exhibits stimulatory effects on rat DCs and promotes the secretion of TH1 cytokines. Taken together, our studies are the first to show that NR-PS is an immunomodulator affecting the maturation and functioning of DCs.
Keywords: Nymphaea rubra Roxb.; pullulanase; polysaccharides; dendritic cells; TH1 immune response; functional foods
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Cheng, J.-H.; Lee, S.-Y.; Lien, Y.-Y.; Lee, M.-S.; Sheu, S.-C. Immunomodulating Activity of Nymphaea rubra Roxb. Extracts: Activation of Rat Dendritic Cells and Improvement of the TH1 Immune Response. Int. J. Mol. Sci. 2012, 13, 10722-10735.
Cheng J-H, Lee S-Y, Lien Y-Y, Lee M-S, Sheu S-C. Immunomodulating Activity of Nymphaea rubra Roxb. Extracts: Activation of Rat Dendritic Cells and Improvement of the TH1 Immune Response. International Journal of Molecular Sciences. 2012; 13(9):10722-10735.
Cheng, Jai-Hong; Lee, Shau-Yu; Lien, Yi-Yang; Lee, Meng-Shiou; Sheu, Shyang-Chwen. 2012. "Immunomodulating Activity of Nymphaea rubra Roxb. Extracts: Activation of Rat Dendritic Cells and Improvement of the TH1 Immune Response." Int. J. Mol. Sci. 13, no. 9: 10722-10735.