OBJECTIVE

To determine the expression profile of miRNA-21, -106, -126 and -146 and to quantify the secretion of IL-1β in the serum of healthy pregnant patients at term with and without active labor and in patients with clinical evidences of chorioamnionitis.

MATERIALS AND METHODS

Analytical, longitudinal, and prolective study carried out in patients admitted for control, obstetric, and pregnancy resolution into the National Institute of Perinatology in Mexico City between February 2015 and August 2016. Study variables: healthy pregnant patients at term with and without active labor and patients with clinical evidence of chorioamnionitis, maternal and gestational age. Five milliliters of peripheral blood were taken from each patient, which was centrifuged, and the serum recovered. RNA was obtained from 500 μL of serum to which the same volume of TRIzol reagent was added. The cDNA was synthesized with 3 ng of RNA by the reverse transcription assay. The expression of the microRNAs was performed by polymerase chain reaction (PCR) with specific primers. The results are presented as mean ± standard deviation and statistical analysis was performed using the Mann-Whitney test with a significant difference of p<0.05.

RESULTS

In healthy pregnant patients with active labor, it was observed that the expression profile of miR-126 increased 1.23-fold (p≤0.001); while the miR-21 and miR-146 decreased 2.1- (pp≤0.001) and 0.73-fold (p≤0.001) respectively and the concentration of IL-1β increased 1.8-fold (p = 0.014) with respect to the healthy patients without labor. The expression profile of these miRNAs and IL-1β change in patients with clinical evidence of chorioamnionitis. The miR-126 and miR-146 increased 1.31- (p≤0.001) and 1.1-fold (p = 0.05); while miR-21 decreased 1.4-fold (p≤0.05) and the concentration of IL-1β increased 2.88-fold (p = 0.002) with respect to patients without active labor. The miR-106 did not show significant differences between the three study groups.

CONCLUSIONS

These results suggest that miRNA-21, -126 and -146 could be considered as molecular markers in the development of chorioamnionitis; however, more tests should be carried out to corroborate this pattern and evaluate its efficiency.

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