Characterization and antitumor effect of a novel polysaccharide from Grifola frondosa.
A novel polysaccharide, MZF, with a molecular mass of 23 kDa was isolated from Grifola frondosa . Results from methylation and (1)H NMR led to the conclusion that MZF is a heteropolysaccharide consisting of -->6)-alpha-D-Galp-(1--> (36.2%), -->3)-alpha-L-Fucp-(1--> (14.5%), -->6)-alpha-D-Manp-(1--> (9.4%), -->3)-beta-D-Glcp-(1--> (10.1%), alpha-D-Manp-(1--> (23.2%), and -->3,6)-beta-D-Glcp-(1--> (6.5%). Although MZF did not affect the proliferation of colon-26 cells in vitro, it significantly inhibited tumor growth in BALB/cA mice inoculated with colon-26 cancer cells. Moreover, MZF significantly induced the proliferation of splenocytes and peritoneal macrophages. The mRNA expression of IL-12p40, IL-2 and IFN-gamma were increased significantly in MZF-treated spleen. Furthermore, MZF augmented the percentage of IFN-gamma-producing cells in both splenic CD4(+) and CD8(+) T cells and tumor infiltrating CD4(+) and CD8(+) T cells and enhanced the cytotoxic activity of NK cells and CTLs. These results indicate that MZF is a novel effective immunomodulator that has antitumor activity associated with induced cell-mediated immunity.
Department of Microbial Chemistry, Kobe Pharmaceutical University, 4-19-1 Motoyama-kitamachi, Higashinada-ku, Kobe 658-8558, Japan. micro-s@kobepharma-u.ac.jp
Yuki
Y
Masuda
Akihisa
A
Matsumoto
Toshihiko
T
Toida
Tadao
T
Oikawa
Koichi
K
Ito
Hiroaki
H
Nanba
D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D005260:Female; D048691:Grifola / Q000737:chemistry*; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D009369:Neoplasms / Q000188:drug therapy / Q000276:immunology / Q000503:physiopathology; D011134:Polysaccharides / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D013047:Specific Pathogen-Free Organisms; D023041:Xenograft Model Antitumor Assays
D000970:Antineoplastic Agents; D011134:Polysaccharides