Chronic inflammation, as seen in conditions such as rheumatoid arthritis (RA) and Crohn's disease, is in part driven by discordant production of inflammatory cytokines such as tumour necrosis factor alpha (TNF) and interleukin (IL)-6. Tyrosine kinase activity is essential to LPS-induced cytokine production in monocytes, and previous studies by us and others have implicated a role for the Tec family kinase Bruton's tyrosine kinase (Btk) in inflammatory cytokine production. Here we show that knockdown of Btk using RNAi results in decreased TNF, but not IL-6 production. Further investigations into the signalling mechanisms regulating IL-6 production led to the discovery that the Tec kinase bone marrow tyrosine kinase gene in chromosome X (Bmx) regulates TLR-induced IL-6 production. Our data further showed that Bmx-dependent super-induction of IL-6 does not involve nuclear factor (NF)-kappaB activity. More detailed investigations of pathways downstream of Bmx signalling revealed that Bmx targets the IL-6 3' untranslated region (UTR) to increase mRNA stabilisation via a novel, thus far undefined p38 mitogen activated protein kinase (MAPK)-independent pathway. These data have important implications for the design of therapeutics targeted against specific cytokines and their regulators in inflammatory disease.