Characterization and immunostimulating activity of a water-soluble polysaccharide isolated from <Emphasis Type="Italic">Haematococcus lacustris</Emphasis> |
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Authors: | Jae Kweon Park Z-Hun Kim Choul Gyun Lee Andriy Synytsya Hang Soo Jo Sung Oog Kim Joo Woong Park Yong Il Park |
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Institution: | (1) A.V. Zhirmunsky Institute of Marine Biology Far-East Branch of Russian Academy of Science, Vladivostok, 690041, Russia;(2) Pacific Institute of Bioorganic Chemistry Far-East Branch of Russian Academy of Science, Vladivostok, 690022, Russia |
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Abstract: | A water-soluble polysaccharide was isolated and purified from the culture filtrate of the photosynthetic green microalgae
Haematococcus lacustris by 75% ethanol precipitation and Sepharose CL-6B column chromatography. The molecular mass of the purified polysaccharide
(named HCP) was estimated to be approximately 135 kDa by size-exclusion HPLC and its monosaccharide composition was galactose,
glucose and mannose at a relative molar ratio of 2.0, 1.0, and 4.1, respectively, suggesting that HCP is a galactomannan.
Fourier-transform infrared and elemental analysis revealed that the purified HCP contains sulfate esters by 1.08% (in mass)
and no detectable level of protein. The HCP significantly stimulated murine macrophage RAW264.7 cells to secrete the pro-inflammatory
cytokine, TNF-α, in a dose-dependent manner and also enhanced the expression of COX-2 and iNOS genes at a concentration of
lower than 10 μg/mL HCP. These results indicated that the sulfated HCP of H. lacustris has potent early innate immune stimulating activities. |
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