Expression of miR-181b and PKG 1 in myocardial hypertrophy cells. (A) The expression level of miR-181b was detected using qPCR in myocardial cells. (B) mRNA and (C) protein expression levels of PKG 1 were detected in myocardial cells using qPCR and western blotting, respectively. Compared with the control group, *P<0.05. miR, microRNA; PE, phenylephrine; NC, random sequence; PKG 1, cGMP-dependent protein kinase type I; qPCR, quantitative polymerase chain reaction.