Evidence for colorectal cancer cell specificity of aspirin effects on NFκB signalling and apoptosis

F. Din,M. Dunlop,L. Stark

Published 2004 in British Journal of Cancer

ABSTRACT

Epidemiological evidence indicates that non-steroidal anti-inflammatory drugs (NSAIDs) protect against colorectal cancer (CRC) to a greater degree than other non-gastrointestinal cancers, but the molecular basis for this difference is unknown. We previously reported that aspirin induces signal-specific IκBα degradation followed by NFκB nuclear translocation in CRC cells, and that this mechanism contributes substantially to aspirin-induced apoptosis. Here, we explored the hypothesis that cell-type specific effects on NFκB signalling are responsible for the observed differences in protection by aspirin against CRC compared to breast and gynaecological cancers. We also assessed whether COX-2 expression, mutation status of adenomatous polyposis coli (APC), β-catenin, p53, or DNA mismatch repair (MMR) genes in CRC lines influenced aspirin-induced effects. We found that aspirin induced concentration-dependent IκBα degradation, NFκB nuclear translocation and apoptosis in all CRC lines studied. However, there was no such effect on the other cancer cell types, indicating a considerable degree of cell-type specificity. The lack of effect on NFκB signalling, paralleled by absence of an apoptotic response to aspirin in non-CRC lines, strongly suggests a molecular rationale for the particular protective effect of NSAIDs against CRC. Effects on NFκB and apoptosis were observed irrespective of COX-2 expression, or mutation status in APC, β-catenin, p53 and DNA MMR genes, underscoring the generality of the aspirin effect on NFκB in CRC cells. These findings raise the possibility of cell-type specific targets for the development of novel chemopreventative agents.

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