Polysaccharides from Dioscorea batatas induce tumor necrosis factor-alpha secretion via Toll-like receptor 4-mediated protein kinase signaling pathways.
The bioactive polysaccharides (named ZPF1) from yam ( Dioscorea batatas) were chemically determined, suggesting repeating beta-1,4-mannan as mainly having a feature of acetylation on C2-OH and C3-OH, around 28%. The ZPF1 participated in the stimulation of murine wild-type macrophages predominantly in tumor necrosis factor-alpha (TNFalpha). Toll-like receptor 4 is proved to be one of the cellular receptors in ZPF1-mediated TNFalpha secretion. Reactive oxygen species transmission and PI3-kinase are found necessary for regulating TNFalpha secretion by ZPF1 stimulation. Moreover, we found that extracellular signal-regulated kinase 1/2, Jun N-terminal kinase 1/2, and p38 mitogen-activated protein kinase play important roles in the regulation of TNFalpha secretion in ZPF1-stimulated macrophages.
Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan.
Ju-Yun
JY
Liu
Feng-Ling
FL
Yang
Chun-Ping
CP
Lu
Yu-Liang
YL
Yang
Chi-Luan
CL
Wen
Kuo-Feng
KF
Hua
Shih-Hsiung
SH
Wu
D000818:Animals; D002460:Cell Line; D027742:Dioscorea / Q000737:chemistry* / Q000276:immunology; D008264:Macrophages / Q000187:drug effects / Q000276:immunology; D051379:Mice; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D011134:Polysaccharides / Q000737:chemistry / Q000494:pharmacology*; D011494:Protein Kinases / Q000276:immunology*; D015398:Signal Transduction / Q000187:drug effects*; D051197:Toll-Like Receptor 4 / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology*
D010936:Plant Extracts; D011134:Polysaccharides; C493487:Tlr4 protein, mouse; D051197:Toll-Like Receptor 4; D014409:Tumor Necrosis Factor-alpha; D011494:Protein Kinases