The inflammatory mediator LTD4 (leukotriene D4) is present at high levels in many inflammatory conditions, and areas of chronic inflammation have an increased risk for subsequent cancer development. We demonstrate here that following LTD4 stimulation, beta-catenin is translocated to the nucleus, triggering the transcriptional activity of the TCF (T-cell factor)/LEF (lymphoid enhancer factor) family of transcription factors. These events are dependent on phosphoinositide-3 kinase activation and glycogen synthase kinase inhibition. Our data suggest that, similar to Wnt signalling, LTD4 increases free beta-catenin and targets it to the nucleus.