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Ji, Xiangming; Wang, Zhiwei; Geamanu, Andreea; Goja, Arvind; Sarkar, Fazlul H; Gupta, Smiti V.
International journal of cancer, 1 December 2012, Letnik: 131, Številka: 11Journal Article
MicroRNAs (miRNAs) are small noncoding RNAs that play critical roles in regulating various cellular functions by transcriptional silencing. miRNAs can function as either oncogenes or tumor suppressors (oncomirs), depending on cancer types. In our study, using miRNA microarray, we observed that downregulation of the Notch‐1 pathway, by delta‐tocotrienol, correlated with upregulation of miR‐34a, in nonsmall cell lung cancer cells (NSCLC). Moreover, re‐expression of miR‐34a by transfection in NSCLC cells resulted in inhibition of cell growth and invasiveness, induction of apoptosis and enhanced p53 activity. Furthermore, cellular mechanism studies revealed that induction of miR‐34a decreased the expression of Notch‐1 and its downstream targets including Hes‐1, Cyclin D1, Survivin and Bcl‐2. Our findings suggest that delta‐tocotrienol is a nontoxic activator of mir‐34a which can inhibit NSCLC cell proliferation, induce apoptosis and inhibit invasion, and thus offering a potential starting point for the design of novel anticancer agents.
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in: SICRIS
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