miRNA-452 in Patients With Preeclampsia and Its Correlation With MMP-9

A villus tissue (2.5 cm \* 2.5 cm \* 2.5 cm) will be cut off immediately from the center of placenta, avoiding the area of infarction, bleeding or calcification. After being washed with normal saline, the tissue will be preserved in liquid nitro¬gen at once for subsequent detection of miR-452 and MMP-9 expression by real time PCR (r-PCR). During this procedure total RNA will be extracted including miR-452 and mRNA of MMP-9. Then by reverse transcriptase RNA will be converted into DNA which will be amplification during the PCR, i.e. in real-time, and not at its end, as in conventional PCR. Expression of miR-452 and MMP-9 will be estimated and correlated with each other.