MSC exosomes also suppressed DC maturation and activation [24,26] and inhibited the release of pro-inflammatory cytokines (TNF-α, IFN-γ, IL-1β) [20,23,26], chemokines (CCL20 and CXCL8) [23,24], and psoriasis-specific cytokines (IL-23) [24]. Here, IL1B is linked to psoriasis.