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Targeting of microRNAs for therapeutics.

miRNAs (microRNAs) comprise a class of small endogenous non-coding RNAs that post-transcriptionally repress gene expression by base-pairing with their target mRNAs. Recent evidence has shown that miRNAs play important roles in a wide variety of human diseases, such as viral infections, cancer and cardiovascular diseases, and thus miRNAs have rapidly emerged as potential targets for therapeutics. LNAs (locked nucleic acids) comprise a class of bicyclic conformational analogues of RNA, which exhibit high binding affinity to complementary RNA molecules and high stability in blood and tissues in vivo. Recent reports on LNA-mediated miRNA silencing in rodents and primates support the potential of LNA-modified oligonucleotides in studying miRNA functions in vivo and in the future development of miRNA-based therapeutics.