The nonsteroidal anti-inflammatory drugs aspirin and indomethacin attenuate beta-catenin/TCF-4 signaling

Oncogene
S DihlmannM von Knebel Doeberitz

Abstract

Increasing epidemiological and experimental evidence implicates non-steroidal anti-inflammatory drugs (NSAIDs) as anti-tumorigenic agents. The precise mechanisms whereby NSAIDs exert their anti-neoplastic effects remain poorly understood. Studies from hereditary and sporadic colorectal cancer (CRC) patients suggest that NSAIDs may interfere with initiating steps of carcinogenesis, i.e. disturbances within the beta-catenin signaling pathway. We therefore investigated beta-catenin/TCF signaling in response to aspirin or indomethacin, respectively, in four CRC cell lines (SW948, SW480, HCT116, LoVo). Both, aspirin and indomethacin inhibited transcription of a beta-catenin/TCF-responsive reporter gene in a dose dependent manner. In addition, the beta-catenin/TCF transcriptional target cyclin D1 was downregulated by both drugs. Endogenous beta-catenin levels remained unaffected by either drug. Moreover, indirect immunofluorescence studies revealed no significant changes of subcellular beta-catenin localization in either cell line after NSAID treatment. Likewise, binding of the beta-catenin/TCF complex to its specific DNA-binding sites was not altered, as demonstrated by electrophoretic mobility shift assay (EMSA) of nuclear extracts...Continue Reading

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