Dual Effect of the Extract from the Fungus Coriolus versicolor on Lipopolysaccharide-Induced Cytokine Production in RAW 264.7 Macrophages Depending on the Lipopolysaccharide Concentration

Tomasz Jędrzejewski,1 Justyna Sobocińska,1 Małgorzata Pawlikowska,1 Artur Dzialuk,2 Sylwia Wrotek1 1Department of Immunology, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Torun, 87-100, Poland; 2Department of Genetics, Faculty of Biological Sciences, Kazimierz Wielki University, Bydgoszcz, 85-090, PolandCorrespondence: Tomasz Jędrzejewski, Department of Immunology, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, 1 Lwowska Str., Torun, 87-100, Poland, Tel +48 56 611 25 18, Email tomaszj@umk.pl Artur Dzialuk, Department of Genetics, Faculty of Biological Sciences, Kazimierz Wielki University, 10 Powstańców Wielkopolskich Ave., Bydgoszcz, 85-090, Poland, Tel +48 52 34 19 281, Email dzialuk@ukw.edu.plPurpose: Extract from the fungus Coriolus versicolor (CV) is classified as an immunological response modifier. Previously, we have shown that this extract induces interleukin 6 (IL-6)-related extension of lipopolysaccharide (LPS)-induced fever. This study investigated the effect of CV extract on the production of pro-inflammatory cytokines and the expression of components of signal transduction pathways leading to the secretion of cytokines from RAW 264.7 macrophages stimulated with different doses of LPS.Methods: RAW 264.7 cells were stimulated with CV extract alone or co-treated with CV extract and LPS. The level of IL-6 and tumour necrosis factor α (TNF-α) in the culture media was measured using ELISA. Protein expression of Toll-like receptor (TLR) 4, phosphorylated IκB (p-IκB), CD14 glycoprotein and phospho-phosphatidylinositol 3-kinase (p-PI3K) was evaluated using Western blot. The effects of TLR4, nuclear factor κB (NF-κB) and p-PI3K on cytokine secretion were estimated using inhibitors: TAK-242, JSH-23 and LY294002.Results: CV extract itself stimulates the secretion of IL-6 and TNF-α and increases the expression of TLR4, p-IκB and p-PI3K. The presence of CV extract during the treatment of cells with lower concentrations of LPS (10 and 100 ...