Exploration of the role of microRNAs in nutrition response

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Micro-RNAs (miRNA) are small RNAs that do not encode proteins and regulate the expression of a variety of genes by interacting with their mRNAs. Aiming at finding miRNAs that respond to nutritional conditions, we performed DNA microarray analysis. An interesting finding was the up-regulation of miR-149* in response to the deficiency of leucine, an essential amino acid. In addition, we manipulated the amount of miR-203, a miRNA which respond to low protein diet, in cultured cells. As miR-203 target, we identified Naa50, a factor involved in cancer and cell growth.