Journal
CARBOHYDRATE POLYMERS
Volume 198, Issue -, Pages 302-312Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.06.076
Keywords
Polysaccharides; Rhizopus nigricans; Macrophage; Antitumor; CT26 colon cancer
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Funding
- Science and Technology Program of Shandong Province (the Key Technology) [2015ZDJS04002]
- Major State Basic Research Development Program of China (973 Program) [2012CB822102]
- High Technology Research and Development Program of China (863 Program) [2012AA021501]
- National Natural Science Foundation of China (NSFC) [81702581]
- Scientific and Technological Innovation Commission of Shenzhen [JCYJ20170306091400043]
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In this study, a homogeneous polysaccharide (RPS-1) was extracted from liquid-cultured mycelia of Rhizopus nigricans. The weight-average molecular weight of RPS-1 was 1.617 x 10(7) g/mol and structural characterization indicated that RPS-1 was a non-starch glucan which consisted of a backbone structure of (1 -> 4)-linked alpha-D-glucopyranosyl residues substituted at the O-6 position with alpha-D-glucopyranosyl branches. RPS-1 stimulated the production of nitric oxide and tumor necrosis factor-alpha by triggering phosphorylation of mitogen-activated protein kinases and nuclear translocation of nuclear factor kappa B p65 in RAW 264.7 macrophage cells. Moreover, intragastric administration of RPS-1 improved the immune function of CT26 tumor-bearing mice and significantly inhibited the growth of transplanted tumor. In combination with 5-FU, RPS-1 enhanced antitumor activity of 5-FU and alleviated its toxicity on immune system. These findings suggested that RPS-1 has the potential for the development of functional foods and dietary supplements.
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