The polysaccharide from Inonotus obliquus protects mice from Toxoplasma gondii-induced liver injury

Int J Biol Macromol. 2019 Mar 15;125:1-8. doi: 10.1016/j.ijbiomac.2018.11.114. Epub 2018 Nov 13.

Abstract

The study aimed to explore the protective effects and mechanism of Inonotus obliquus polysaccharide (IOP) on liver injury caused by Toxoplasma gondii (T. gondii) infection in mice. The results showed that treatment with IOP significantly decreased the liver coefficient, the levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), malondialdehyde (MDA) and nitric oxide (NO), and increased the contents of antioxidant enzyme superoxide dismutase (SOD) and glutathione (GSH). IOP effectively decreased the expression of serum tumor necrosis factor alpha (TNF-α), interleukin-6 (IL-6), interleukin-1β (IL-1β), interferon-γ (IFN-γ) and interluekin-4 (IL-4) in T. gondii-infected mice. In agreement with these observations, IOP also alleviated hepatic pathological damages caused by T. gondii. Furthermore, we found that IOP down-regulated the levels of toll-like receptor 2 (TLR2) and toll-like receptor 4 (TLR4), phosphorylations of nuclear factor-κappaB (NF-κB) p65 and inhibitor kappaBα (IκBα), whereas up-regulated the expressions of nuclear factor erythroid 2-related factor 2 (Nrf2) and heme oxygenase-1 (HO-1). These findings suggest that IOP possesses hepatoprotective effects against T. gondii-induced liver injury in mice, and such protection is at least in part due to its anti-inflammatory effects through inhibiting the TLRs/NF-κB signaling axis and the activation of an antioxidant response by inducing the Nrf2/HO-1 signaling.

Keywords: Inonotus obliquus polysaccharide; Liver injury; Nrf2/HO-1; TLRs/NF-κB; Toxoplasma gondii.

MeSH terms

  • Animals
  • Antiprotozoal Agents / chemistry
  • Antiprotozoal Agents / isolation & purification
  • Antiprotozoal Agents / pharmacology*
  • Basidiomycota / chemistry*
  • Biomarkers
  • Chromatography, High Pressure Liquid
  • Cytokines / metabolism
  • Fungal Polysaccharides / chemistry
  • Fungal Polysaccharides / isolation & purification
  • Fungal Polysaccharides / pharmacology*
  • Inflammation Mediators / metabolism
  • Liver Diseases, Parasitic / drug therapy
  • Liver Diseases, Parasitic / metabolism
  • Liver Diseases, Parasitic / parasitology*
  • Male
  • Mice
  • Molecular Weight
  • Monosaccharides
  • Toxoplasma / drug effects*
  • Toxoplasmosis, Animal / drug therapy
  • Toxoplasmosis, Animal / metabolism
  • Toxoplasmosis, Animal / parasitology*

Substances

  • Antiprotozoal Agents
  • Biomarkers
  • Cytokines
  • Fungal Polysaccharides
  • Inflammation Mediators
  • Monosaccharides