Objective: To investigate the role of miRNA-335 on the proliferation and apoptosis of placental trophoblast cells in preeclamptic rats and its potential mechanism.
Methods: Placental trophoblast cells were isolated from preeclamptic model rats and normal ones. Trophoblast cells from the model group were divided into six groups for transfection: the blank (empty vector) group, the NC (negative control) group, the miRNA-335 mimic group, the miRNA-335 inhibitor group, the CRIM1 (overexpressed recombinant plasmid) group, and the miRNA-335 inhibitor + CRIM1 group. The miRNA-335 expressions after the transfection were determined using qRT-PCR. The mRNA and protein expressions of CRIM1, the transforming growth factor (TGF-β1), and the apoptosis-related factors (Bax and Bcl-2) in each group were determined using qRT-PCR and Western blotting. The cell proliferation and apoptosis were determined using MTT assays and flow cytometry, respectively.
Results: Compared with normal rats, the systolic blood pressure, diastolic blood pressure, and urinary protein levels were increased in the model rats, which had increased miRNA-335 expressions, but a decreased CRIM1 expressions (all P<0.05). The inhibition of miRNA-335 promoted the expressions of CRIM1, TGF-β1, and Bcl-2 and inhibited the expression of Bax in trophoblast cells (all P<0.05). miRNA-335 inhibition or CRIM1 over-expression promoted the proliferation and reduced the apoptosis of trophoblast cells. The combined effect of miRNA-335 inhibition or CRIM1 over-expression had an even more significant effect on the changes in the above indicators (all P<0.05).
Conclusion: miRNA-335 inhibition can enhance the expression of CRIM1 to promote the proliferation and reduce the apoptosis of trophoblast cells in preeclamptic rats.
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