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KMID : 1161420190220050451
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Journal of Medicinal Food
2019 Volume.22 No. 5 p.451 ~ p.459
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Rhamnogalacturonan-I-Type Polysaccharide Purified from Broccoli Exerts Anti-Metastatic Activities Via Innate Immune Cell Activation
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Kwak Bong-Shin
Hwang Da-Hyun
Lee Sue-Jung
Choi Hyuk-Jun
Park Ho-Young
Shin Kwang-Soon
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Abstract
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To examine the anti-metastatic activities of polysaccharides in broccoli, purified polysaccharides (BCE-I, -II, and -III) were isolated by fractionation of broccoli enzyme extracts and subsequent ethanol precipitation. BCE-I mainly consisted of galactose and arabinose, whereas BCE-II mainly consisted of galacturonic acid and rhamnose, and BCE-III mainly consisted of rhamnose and galactose. Of the three fractions, stimulation of murine peritoneal macrophages by BCE-I showed the greatest enhancement of tumor necrosis factor-α, interleukin (IL)-12, and IL-6 secretion. In addition, intravenous (i.v.) administration of BCE-I enhanced the lethal activity of natural killer (NK) cells on YAC-1 tumor cells significantly and dose-dependently in an ex vivo experiment of NK cell activity. In an experimental model using lung metastasis of Colon26-M3.1 carcinoma cells, prophylactic i.v. and oral administration of BCE-I significantly and dose-dependently inhibited lung metastatic activity. Furthermore, the inhibitory activity of BCE-1 on lung metastasis partially disappeared when NK cell function was removed through treatment of rabbit anti-asialo GM1. These results indicated that BCE-I has potent antitumor metastatic activity, and that its anti-metastatic activity has relevance to the stimulation of NK and other immune cells.
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KEYWORD
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anti-metastatic activity, broccoli, natural killer cells, pectinase digest, polysaccharide
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