Notch-1 down-regulation by curcumin is associated with the inhibition of cell growth and the induction of apoptosis in pancreatic cancer cells

Cancer
Zhiwei WangFazlul H Sarkar

Abstract

Notch signaling plays a critical role in maintaining the balance between cell proliferation, differentiation, and apoptosis, and thereby may contribute to the development of pancreatic cancer. Therefore, the down-regulation of Notch signaling may be a novel approach for pancreatic cancer therapy. It has been reported that curcumin down-regulates many genes that are known to promote survival and also up-regulates genes that are known promoters of apoptosis in pancreatic cancer cells in vitro. It also has been reported that there is cross-talk between Notch-1 and another major cell growth and apoptotic regulatory pathway, the nuclear factor kappaB (NF-kappaB) pathway, which is down-regulated by both curcumin and reduction of Notch-1 levels. However, to the authors' knowledge to date, no studies have determined whether the down-regulation of Notch-1 signaling, resulting in the inactivation of NF-kappaB activity, contributes to curcumin-induced cell growth inhibition and apoptosis in pancreatic cancer cells. The authors used multiple molecular approaches, such as the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, an apoptosis assay, gene transfection, real-time reverse transcriptase-polymerase chain react...Continue Reading

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