Objective To investigate whether or not hepatocyte nuclear factor 4( HNF4) is the target gene of miR-23b-3p,and down-regulating effect of miR-23b-3p on apolipoprotein( a) [apo( a) ] expression,providing a new idea for reducing high concentration lipoprotein( a). Methods Target genes in miR-23b-3p and hepatocyte nuclear factor 4 were analyzed by Targetgene,an online bioinformatics tools,and tested by dual luciferase reporter assays in JM109 cell,RT-PCR was used to measure the expression level of apo( a) in Hep G2 cell. Results Targetge...