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• W1997689650 abstract "Sequence-non-specific effects of siRNAs that alter the expression of non-targeted genes have been reported, including competition of siRNAs with endogenous RISC components. However, the detailed mechanisms and subsequent effects of such competition are not well documented. Here we analyze the competition of miRNAs in mammalian cells with low concentrations of siRNAs, and found that: 1) transfection of different siRNAs in the low nanomolar range used to deplete target RNAs can reduce the levels of miRNAs in different cell types, 2) siRNA transfection results in rapid reduction of Ago2-associated miRNAs concurrent with accumulation of Ago2-bound siRNAs and a significant change in the expression levels of many miRNAs, 3) competition largely depends on Ago2 and not Dicer, 4) microarray analysis showed that the majority of highly expressed miRNAs are reduced, in a siRNA concentration dependent manner, and low abundant miRNAs may be unchanged or repressed and a few miRNAs appear to have increased levels, and 5) consistent with previous studies, the expression levels of mRNAs that are targeted by highly repressed miRNAs are preferentially increased. As a consequence of such competition, we observed that α-tubulin, a substrate of two up-regulated proteases, granzyme B and granzyme M, was rapidly degraded at the protein level upon siRNA transfection. Our results support a model in which transfection of siRNAs can change the levels of many miRNAs by competition for Ago2, leading to altered expression of many miRNA target genes, which can in turn affect downstream gene expression even at the protein level." @default.
• W1997689650 created "2016-06-24" @default.
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• W1997689650 date "2013-05-01" @default.
• W1997689650 modified "2023-09-23" @default.
• W1997689650 title "Transfection of siRNAs can alter miRNA levels and trigger non-specific protein degradation in mammalian cells" @default.
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• W1997689650 doi "https://doi.org/10.1016/j.bbagrm.2013.01.011" @default.
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