In psoriasis, moreover, the cytokines IL-17, IL-22, TNF-α and IFN-γ promote the secretion of antimicrobial peptides (AMPs) such as human β-defensins and the cathelicidin LL-37 (encoded by CAMP) by keratinocytes (Takahashi and Yamasaki, 2020). Here, IL22 is linked to psoriasis.