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. 2003 Apr 1;371(Pt 1):115–124. doi: 10.1042/BJ20021669

The anti-apoptotic effect of leukotriene D4 involves the prevention of caspase 8 activation and Bid cleavage.

Katarina Wikström 1, Maria Juhas 1, Anita Sjölander 1
PMCID: PMC1223256  PMID: 12482325

Abstract

We have shown in a previous study that leukotriene D(4) (LTD(4)) signalling increases cell survival and proliferation in intestinal epithelial cells [Ohd, Wikström and Sjölander (2000) Gastroenterology 119, 1007-1018]. This is highly interesting since inflammatory conditions of the bowel are associated with an increased risk of developing colon cancer. The enzyme cyclo-oxygenase 2 (COX-2) is important in this context since it is up-regulated in colon cancer tissues and in tumour cell lines. Treatment with the COX-2-specific inhibitor N -(2-cyclohexyloxy-4-nitrophenyl)methane sulphonamide has been shown previously to cause apoptosis in intestinal epithelial cells. In the present study, we attempted to elucidate the underlying mechanisms and we can now show that a mitochondrial pathway is employed. Inhibition of COX-2 causes release of cytochrome c, as shown by both Western-blot and microscopy studies, and as with apoptosis, this is significantly decreased by LTD(4). Since previous studies showed increased Bcl-2 levels on LTD(4) stimulation, we further studied apoptotic regulation at the mitochondrial level. From this we could exclude the involvement of the anti-apoptotic protein Bcl-X(L) as well as its pro-apoptotic counterpart Bax, since they are not expressed. Furthermore, the activity of the pro-apoptotic protein Bad (Bcl-2/Bcl-X(L)-antagonist, causing cell death) was completely unaffected. However, inhibition of COX-2 caused cleavage of caspase 8 into a 41 kDa fragment associated with activation and caused the appearance of an activated 15 kDa fragment of Bid. This indicates that N -(2-cyclohexyloxy-4-nitrophenyl)methane sulphonamide-induced apoptosis is mediated by the activation of caspase 8, via generation of truncated Bid, and thereafter release of cytochrome c. Interestingly, LTD(4) not only reverses the effects induced by inhibition of COX-2 but also reduces the apoptotic potential by lowering the basal level of caspase 8 activation and truncated Bid generation.

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Selected References

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