Structural Characterization and Anti-Inflammatory Activities of a Purified Polysaccharide from Veronica persica Poir

In this manuscript, the polysaccharide (VPP-I) from Veronica persica Poir., was characterized in detail by high performance gel permeation chromatography (HPGPC), high performance liquid chromatography (HPLC), Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (NMR). In addition, lipopolysaccharide (LPS) induced inflammation model of RAW264.7 cells was used to evaluate the in vitro anti-inflammatory activity of VPP-I. The results showed that the relative molecular weight of VPP-I was 2.355 KDa, which was mainly composed of mannose (Man), glucose (Glc) and galactose (Gal) in a ratio of 1 : 32.46 : 28.76. Moreover, the VPP-I contained sugar alcohol derivatives of T-DGlcp(1→, →4)-D-Galp(1→, →3,6)-D-Manp(1→, →4)-D-Glcp(1→, →6)-D-Galp(1→ and →6)-D-Glcp(1→. In vitro anti-inflammatory results showed that VPP-I could inhibit the secretion of IL-β, IL-6 and TNF-α in RAW264.7 cells induced by LPS. Moreover, compared to the LPS group, the mRNA expression levels of iNOS, COX-2, IL-β, IL-6 and TNF-α produced by RAW264.7 were significantly decreased after treatment with VPP-I (P<0.05). In addition, VPP-I could increase the SOD and GSH-Px enzymes activity and decrease the content of MDA in LPS-induced RAW264.7 cells (P<0.05). In summary, this paper laid theoretical foundation for the application of Veronica persica Poir. in the field of medicine.