The expression of IL-8 is negatively regulated by a number of mechanisms. MiRNA-146a/b-5p indirectly represses IL-8 expression by silencing the expression of IRAK1.[18] Additionally, the 3'UTR of IL-8 contains a A/U-rich element that makes it extremely unstable under certain conditions. IL-8 expression is also regulated by the transcription factor NF-κB.[19] NF-κB regulation represents a novel anti-IL-8 therapy for use in inflammatory diseases such as cystic fibrosis.