Polygalasaponin F, an oleanane-type triterpenoid saponin extracted from Polygala japonica, decreases the release of the inflammatory cytokine tumor necrosis factor a (TNFa). Polygalasaponin F reduces neuroinflammatory cytokine secretion through the regulation of the TLR4-PI3K/AKT-NF-kB signaling pathway [1].
References:
[1]. Yan WF , et al. The molecular mechanism of polygalasaponin F-mediated decreases in TNFα: emphasizing the role of the TLR4-PI3K/AKT-NF-κB pathway. J Asian Nat Prod Res. 2015;17(6):662-70.