Differential TGF? pathway targeting by miR-122 in humans and mice affects liver cancer metastasis.

ABSTRACT: Downregulation of a predominantly hepatocyte-specific miR-122 is associated with human liver cancer metastasis, whereas miR-122-deficient mice display normal liver function. Here we show a functional conservation of miR-122 in the TGF? pathway: miR-122 target site is present in the mouse but not human TGF?R1, whereas a noncanonical target site is present in the TGF?1 5'UTR in humans and other primates. Experimental switch of the miR-122 target between the receptor TGF?R1 and the ligand TGF?1 changes the metastatic properties of mouse and human liver cancer cells. High expression of TGF?1 in human primary liver tumours is associated with poor survival. We identify over 50 other miRNAs orthogonally targeting ligand/receptor pairs in humans and mice, suggesting that these are evolutionarily common events. These results reveal an evolutionary mechanism for miRNA-mediated gene regulation underlying species-specific physiological or pathological phenotype and provide a potentially valuable strategy for treating liver-associated diseases.

SUBMITTER: Yin S 

PROVIDER: S-EPMC4802055 | biostudies-literature | 2016 Mar

REPOSITORIES: biostudies-literature