BAG-1 is up-regulated in colorectal tumour progression and promotes colorectal tumour cell survival through increased NF-kappaB activity

Carcinogenesis
Nadine K ClemoAnn C Williams

Abstract

Although expression of the anti-apoptotic protein Bcl-2-associated athanogene-1 (BAG-1) has been reported as up-regulated in a number of malignancies, we show for the first time that BAG-1 is over-expressed in medium/large-sized colorectal adenomas and carcinomas compared with normal epithelium. To investigate whether expression of BAG-1 is important for colorectal tumour cell survival, microarray analysis was carried out on the HCT116 colorectal carcinoma cell line following transfection with BAG-1 small interfering RNA (siRNA). Analysis identified altered expression of a subset of potential nuclear factor-kappaB (NF-kappaB)-regulated genes. Furthermore, knock down of BAG-1 was shown to inhibit NF-kappaB transcriptional activity. Inhibition of NF-kappaB activity using BAG-1 siRNA or the NF-kappaB inhibitor BAY-117082 suppressed HCT116 cell yield and induced apoptosis; combined treatment had no additive effect, suggesting that the decrease in cell yield associated with knock down of BAG-1 expression is mediated via inhibition of NF-kappaB. Of clinical relevance, BAG-1 siRNA sensitized colorectal carcinoma cells to apoptosis induced by potential therapeutic agent TRAIL as well as tumour necrosis factor-alpha, both inducers of NF...Continue Reading

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