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RNA interference (RNAi) is a post-transcriptional pathway in which double-stranded RNA (dsRNA) triggers the degradation of complementary mRNA in the cytoplasm of eukaryotic cells. In plants and in some animals, including Caenorhabditis elegans, initiation of RNAi in one cell can lead to sequence-specific RNA silencing in another cell, a phenomenon referred to as non-cell-autonomous RNAi. Until recently, this phenomenon had not been observed in mammalian cells. Here, we review emerging data demonstrating that non-cell-autonomous RNAi occurs in cultured mammalian cells. We discuss possible mechanisms for the transfer of RNAi between mammalian cells and highlight the implications of this phenomenon for the development of in vivo cell-based RNAi delivery.
RNAi, siRNA, miRNA, non-cell-autonomous RNAi, systemic RNAi, RNAi delivery, cellbased delivery, RNAi, Gene Silencing