“…Increased levels of IL-22 were found to be associated with lupus erythematosus (Zhao et al, 2013b), Sjogren's syndrome (Ciccia et al, 2012), Behcet's disease (Cai et al, 2013), asthma (Pennino et al, 2013;Manni et al, 2014), atopic dermatitis (Nograles et al, 2009), multiple sclerosis (Beyeen et al, 2010), psoriasis (Ouyang, 2010;Hao, 2013), inflammatory bowel disease (ibd) (Seiderer and Brand, 2009;Ouyang, 2010), and rheumatoid arthritis (da Rocha, 2012;Xie et al, 2012). It is interesting, however, that multiple experiments on animal models showed that IL-22 may exert either a pathogenic impact or a protective impact on the above-mentioned diseases (Yang and Zheng, 2014). In particular, two different groups independently observed that IL-22 is a survival factor for hepatocytes during acute liver inflammation (Radaeva et al, 2004;Zenewicz et al, 2007).…”