“…A large amount of IL-17 was also manufactured in peripheral blood mononuclear cells (PBMC) ( Kim et al, 2005 ), and its concentration was higher than that in healthy people ( Chabaud et al, 1999 ; Ziolkowska et al, 2000 ; Li et al, 2013 ). Several studies have proven that the content of IL-17 in synovial tissue and serum is directly related to the degree of RA joint injury ( Kirkham et al, 2006 ; Schofield et al, 2016 ; Siloşi et al, 2016 ; Lee and Bae, 2017 ; Costa et al, 2019 ). The increase in IL-17 levels in serum, synovial fluid, and PBMC is related to the expression of C-reactive protein, erythrocyte sedimentation rate, and rheumatoid factor ( Roşu et al, 2012 ; El-Maghraby et al, 2019 ).…”