Dysregulated circulating miRNAs in preeclampsia

  • Authors:
    • Carine Munaut
    • Linda Tebache
    • Silvia Blacher
    • Agnès Noël
    • Michelle Nisolle
    • Frédéric Chantraine
  • View Affiliations

  • Published online on: October 14, 2016     https://doi.org/10.3892/br.2016.779
  • Pages: 686-692
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Preeclampsia (PE) is a pregnancy-related disease with potentially severe consequences with respect to foeto-maternal morbidity and mortality. However, the molecular pathogenesis of PE remains largely unknown. Recent reports have shown that microRNAs (miRNAs or miRs) may play important roles in the development of PE. Analysing the miRNAs in sera from preeclamptic women may improve our understanding of the pathophysiological mechanisms of the disease. The aim of this retrospective study was to identify whether circulating miRNAs were differentially expressed in PE patients compared with controls. Serum samples from 23 women who developed PE were compared with samples from 44 pregnant controls. Seventeen circulating miRNAs previously described in PE were chosen for evaluation of their expression by reverse transcription quantitative polymerase chain reaction (RT‑qPCR). In the maternal serum, the miR‑210‑3p, miR‑210‑5p, miR‑1233‑3p, and miR‑574‑5p levels were found to be significantly higher in the PE patients than in the controls (P<0.05). Using a logistic regression model, we evaluated the discriminant power of those differentially expressed miRNAs, and the combination of miR‑210‑5p and miR‑574‑5p yielded an area under the curve of 0.7223 for discriminating PE patients from the controls. In conclusion, the fact that four circulating miRNAs (miR‑210‑3p, miR‑210‑5p, miR‑1233‑3p, and miR‑574‑5p) were differentially expressed in the sera of women who developed PE compared with controls confirms the possible pathophysiological role of miRNAs in PE.


Preeclampsia (PE) is a pregnancy-specific syndrome associated with hypertension and proteinuria or thrombocytopenia, renal insufficiency, impaired liver function, pulmonary oedema, cerebral symptoms, and visual symptoms (1). PE affects 2–5% of pregnancies worldwide (24). It can lead to severe maternal and perinatal morbidity, including uterine growth restriction and prematurity. PE is responsible for an elevated perinatal mortality rate and causes 10–15% of maternal deaths (3,5).

The placenta plays a key role in the initiation and progression of the disorders caused by PE (6). As commonly described, PE has a combined genetic, immune, and angiogenic aetiology. The origin of PE seems to be the impaired invasion of maternal spiral arteries by trophoblast cells in the context of local abnormal immune interactions between the fetoplacental unit and mother (79). Placental underperfusion induces a chronic hypoxic state (10). Combined with the reoxygenation that occurs, it creates increased local oxidative stress, resulting in apoptosis and necrosis of the placenta. Placental pro-inflammatory and antiangiogenic mediators and apoptotic bodies, released in the maternal circulation, cause maternal systemic endothelial cell dysfunction and systemic inflammation (5,11). Although several hypotheses have been suggested to explain this vascular, multi-systemic pregnancy-related disease, its complete pathogenesis remains poorly understood (12,13), and PE prevention, diagnosis, and treatment remain an important challenge.

MicroRNAs (miRNAs or miRs) are small non-coding RNAs (20–24 nucleotides) that regulate gene expression through post-transcriptional repression or degradation of messenger RNA (14,15). miRNAs are present in animals and plants and have been detected in several human fluids (16). They are critical in many biological processes, including the regulation of cell differentiation, proliferation, apoptosis, angiogenesis, and metabolism (17). Specific plasma-related miRNAs were identified in maternal plasma or serum in normal pregnancies, as well as in pathological pregnancy conditions, such as PE (18,19). Several recent reports described the significant dysregulation of specific miRNA expression in the maternal circulation of PE patients compared with controls (miR-24, miR-26a, miR-29a, miR-103, miR-130b, miR-141, miR-144, miR-152, miR-181a, miR-210, miR-342-3p, miR-520, miR-574-5p, and miR-1233) (2023).

We hypothesized that the expression levels of specific miRNAs in maternal blood could be dysregulated before the onset of PE and be used to enhance screening, diagnosis, or prognosis. We aimed to analyse, in a case-control study, several miRNAs that were previously described as differentially expressed in PE.

Materials and methods

miRNA selection

After performing a review on PubMed until 26 February, 2015, using the key words, ‘miRNA, pregnancies, preeclampsia, placenta, circulating’, and consulting the miRNA database, 17 miRNAs were selected (Table I).

Table I.

Primers used in quantitative PCR.

Table I.

Primers used in quantitative PCR.

miRNAmiRBaseReference QiagenSequence of primer (5′-3′)
hsa-miR-144-3pMIMAT0000436MS00020328 TACAGTATAGATGATGTACT
hsa-miR-1233-3pMIMAT0005588MS00008512 TGAGCCCTGTCCTCCCGCAG
hsa-miR-1233-5pMIMAT0022943MS00045213 AGTGGGAGGCCAGGGCACGGCA
hsa-miR-130b-3pMIMAT0000691MS00003451 CAGTGCAATGATGAAAGGGCAT
hsa-miR-130b-5pMIMAT0004680MS00008610 ACTCTTTCCCTGTTGCACTAC
hsa-miR-181a-3pMIMAT0000270MS00006692 ACCATCGACCGTTGATTGTACC
hsa-miR-16-2-3pMIMAT0004518MS00008813 CCAATATTACTGTGCTGCTTTA
hsa-miR-124-3pMIMAT0000422MS00006622 TAAGGCACGCGGTGAATGCC
RNU6-2 MS00033740

[i] RNU6, U6 small nuclear RNA; hsa, Homo sapiens; c, Caenorhabditis elegans.

Study population

In this retrospective study, 67 pregnant women, aged 19–44 years, with a gestational age of 24–36 weeks and 6 days of amenorrhea, were selected among a prospective cohort of pregnant women presenting, at 24 to <37 weeks' gestation, clinical suspicion of, but not manifesting preeclampsia/eclampsia/HELLP syndrome. Suspicion of PE was assessed on the basis of the following criteria: New elevation of blood pressure (<140/90 mmHg), with or without pre-existing essential hypertension; de novo or major proteinuria (<30 mg/dl or <2+ on a urine dipstick); and clinical (epigastric pain, headache, visual disturbances, and excessive weight gain), biological (thrombocytopenia or elevation of transaminases), and ultrasonic (intrauterine growth restriction, elevation of the uterine artery pulsatility index, or uterine artery notch) characteristics favouring PE. Manifestation of PE at selection was an exclusion criterion.

In each patient presenting with the aforementioned signs and symptoms who agreed to participate, blood was collected and further pregnancy follow-up was performed. Retrospectively, the PE and control cohorts were defined based on the diagnosis of PE at delivery.

The present study was approved by the Ethics Committee of the CHR Citadelle Hospital, Liège, Belgium, and informed consent was obtained from all the patients.

Sample collection

Blood samples were immediately centrifuged at 1,000 × g for 15 min, and sediment-free serum samples were collected. The serum aliquots were frozen at −80°C until further analysis and were thawed only once thereafter.

miRNA extraction

Total RNA, including miRNA, was extracted from 200 µl of serum using the miRNeasy Serum/Plasma kit (Qiagen; Hilden, Germany) according to the manufacturer's instructions, and it was then eluted in 30 µl of nuclease-free water. A synthetic spike-in control miRNA (C. elegans miR-39 mimic, Qiagen) was added for subsequent normalisation.

Quantitative polymerase chain reaction (qPCR) for miRNAs

Total miRNA (2 µl) from each sample was reverse-transcribed with the miScript II TR kit (Qiagen) according to the manufacturer's instructions. The miRNAs were subsequently quantified using the miScript SYBR-Green PCR kit (Qiagen) and specific forward primers. The reaction mixture included 2.5 µl of cDNA, 12.5 µl of QuantiTect SYBR-Green PCR Master Mix (Qiagen), 2.5 µl of forward primer, 2.5 µl of miScript Universal Primer (Qiagen), and 5 µl of RNase-free water for a final reaction volume of 25 µl. The thermal cycling consisted of an initial denaturation at 95°C for 15 min, followed by 45 cycles at 95°C for 15 sec, 55°C for 30 sec, and 70°C for 30 sec.

The reactions were run in duplicate. Threshold cycle (Cq) and melting curves were acquired using the quantification and melting curve programs of the LightCycler® 96 Real-Time System (Roche Diagnostics GmbH, Mannheim, Germany). U6 small nuclear RNA (RNU6) and c-miR-39 were used to determine relative miRNA expression with the 2-ΔCq method (2426). The miRNA-specific primer sequences are listed in Table I.

Statistical analysis

Quantitative parameters are presented as the means ± standard errors or medians. The statistical significance of differences in the expression levels of serum miRNAs between PE patients and controls was determined by the non-parametric Mann-Whitney U-Wilcoxon test. To determine the diagnostic accuracy of the miRNA expression levels, we generated receiver operating characteristic (ROC) curves and calculated the area under the ROC curves (AUC) (27). An evaluation of the diagnostic power of multiple combinations of the miRNA serum levels was performed using a logistic regression model. For all the statistical analyses, we used the statistics toolbox of Matlab R2024a software (MathWorks Inc., Natick, MA, USA). P<0.05 was considered to indicate a statistically significant difference.


Clinical characteristics

Table II shows the main features of the patients in each group. The median of gestational ages at inclusion (min-max) of the pregnant women were 32.1 (25.3–36.6) (PE patients) and 31.1 (24.3–36.5) weeks (controls). There were no significant differences between the subjects and controls with respect to gestational age, maternal age, body mass index, smoking status, parity, gestity, ethnicity, personal and family history of PE, previous hypertension, proteinuria, and mean uterine artery pulsatility index. The median of gestational ages (min-max) at delivery were 36.4 (30.0–39.3) (PE patients) and 39.1 (35.2–41.3) weeks (controls) (P<0.0001).

Table II.

Demographic and clinical characteristics of controls and preeclamptic (PE) pregnancies.

Table II.

Demographic and clinical characteristics of controls and preeclamptic (PE) pregnancies.

CharacteristicsControls (n=44)PE (n=23)P-value
Maternal age (years)30 (19–38)29 (19–44)0.82701
Gestational age at inclusion (weeks)31.1 (24.3–36.5)32.1 (25.3–36.6)0.51313
Gestational age at delivery (weeks)39.1 (35.2–41.3)36.4 (30.0–39.3)<0.0001
Body mass index27.2 (16.1–39.30)27.40 (19–41.5)0.85331
Gestity2 (1–6)2 (1–7)0.19814
Parity1 (0–5)0 (0–3)0.13570
Smoking status
  Previous smokers6 (13.6%)3 (13%)0.66976
  Smokers4 (9%)3 (13%)
Previous HTA3 (6.8%)2 (8.7%)0.79403
Family history of PE7 (16%)6 (26%)0.31431
Proteinuria36 (81.8%)19 (82.6%)0.68365
Mean artery pulsatility index0.77 (0.36–1.50)0.86 (0.37–1.88)0.27001
Systolic blood pressure (mmHg)129 (105–160)134 (120–159)0.01763
Diastolic blood pressure (mmHg)80 (60–100)85 (70–100)0.01551

[i] Values are presented as median (min-max) or numbers (percentage). Statistical analyses were performed by the Mann-Whitney U-Wilcoxon test.

Differential expression of circulating miRNAs

The expression levels of the 17 miRNAs (miR-16-2-3p, miR-24-3p, miR-26a-5p, miR-29a-3p, miR-124-3p, miR-130b-5p miR-130b-3p, miR-144-3p, miR-155-5p, miR-181a-3p, miR-181a-5p, miR-210-3p, miR-210-5p, miR-342-3p, miR-574-5p, miR-1233-3p, and miR-1233-5p) from the serum samples in the two groups (PE patients and controls) were analysed with reverse transcription quantitative polymerase chain reaction (RT-qPCR). According to RT-qPCR analysis, there was a significant upregulation of 4 miRNAs: miR-210-3p, miR-210-5p, miR-1233-3p, and miR-574-5p, in the serum of PE patients compared with controls (P<0.05) (Table III, Fig. 1).

Table III.

Circulating miRNA expression levels in controls and preeclamptic pregnancies.

Table III.

Circulating miRNA expression levels in controls and preeclamptic pregnancies.

miRNAControls (n=44)PE (n=23)P-value (Wilcoxon)
Assessment of the screening value of circulating miRNAs in PE

We constructed and examined the ROC curves of the 4 miRNAs that were upregulated in PE serum to evaluate their potential utility as biomarkers (Fig. 2). The AUCs of miR-210-3p, miR-210-5p, miR-1233-3p, and miR-574-5p were 0.7090 [95% confidence interval (CI), 0.582–0.836], 0.7040 (95% CI, 0.568–0.840), 0.673 (95% CI, 0.543–0.803), and 0.710 (95% CI, 0.578–0.842), respectively (Table IV). To improve the diagnostic power of the miRNA expression levels, we applied a logistic regression model to the data from PE patients and controls. Different combinations were added to the model, and a maximum AUC of 0.7223 was found for miR-210-5p and miR-574-5p (Fig. 3). The fitted logistic regression model is as follows:

Table IV.

ROC results for several miRs.

Table IV.

ROC results for several miRs.

miRsArea under the ROC curve (SE)95% CIP-value
miR-210-3p0.7090 (0.06496)0.5816–0.83630.005
miR-210-5p0.7041 (0.06918)0.5684–0.83970.006
miR-1233-3p0.6729 (0.06632)0.5429–0.80290.021
miR-574-5p0.7100 (0.06717)0.5783–0.84170.005

[i] CI, confidence interval; SE, standard error; miRs, microRNAs.


where P(Y=1) is the probability that the sample is a preeclamptic sample.


Recently, the aberrant expression of miRNAs has been documented in different pregnancy-related conditions, such as PE, ectopic pregnancy, gestational diabetes mellitus, small for gestational age, recurrent pregnancy loss, and preterm delivery (28). These findings may be useful to improve our understanding of the underlying pathophysiology of these conditions.

In the present study, we confirmed the differential expression of several miRNAs that were identified in previous studies (2023). Of the 17 miRNAs selected, miR-210-3p, miR-210-5p, miR-1233-3p, and miR-574-5p were upregulated in the sera of women who later developed PE compared with the controls who did not develop PE according to RT-qPCR. By performing logistic regression analysis of the differentially expressed miRNAs, we found that the combination of miR-210-5p and miR-574-5p had the best diagnostic power with an AUC of 0.7223.

In our selection of miRNAs based on the data published in previous studies, we found very little overlap between the reported studies. This may be due to differences in the sample collection (sera versus plasma) or methods used for the analyses (RT-qPCR versus microarrays). Even results obtained from the same platform using products from different companies may be responsible for this low correlation of results (29,30). RT-qPCR is often considered as the ‘gold standard’ for the detection and quantification of gene expression. As a result, we chose to validate previously identified miRNA results using this procedure. However, one important step of RT-qPCR is normalisation of the miRNA expression level. Using improper reference genes for normalisation can result in evaluation bias during data analysis. To the best of our knowledge, there has been no consensus regarding a reliable housekeeping miRNA for analysing circulating miRNAs. Therefore, it becomes difficult to directly compare the results from different studies. In the present study, we used a double normalisation procedure, including the use of the synthetic c-miR-39 and RNU6B. The same amount of c-miR-39 was added to each sample before the extraction procedure, and the c-miR-39 expression level reflected differences at the same time in the extraction, reverse transcription, and PCR amplification procedures (31). However, the use of RNU6B complements technical bias with biological bias. Although RNU6B does not necessarily represent the ‘best’ reference, it has been previously used to analyse miRNAs in the sera of preeclamptic women (23,32).

The selection of the patients included in different studies may also introduce some bias. To identify new biomarkers for PE, a common strategy is to analyse a few samples or a pool of samples when performing miRNA profiling. This step is further followed by a validation procedure, frequently RT-qPCR, with additional samples from PE cases and controls. Usually, the second step does not completely validate the profiling step (18,20,21). Thus, in order to evaluate previously differentially reported miRNAs in PE, we performed a case-control study with 23 PE patients and 44 controls. The two groups were found to be comparable with respect to their maternal age, gestational age at inclusion, gestity, and parity. However, the retrospective nature of the investigation was one limitation of the study. A second limitation is that we were unable to separately analyse early- and late-onset PE due to the small sample size.

There is currently no consensus regarding a set of differentially expressed miRNAs in PE that may be used as biomarkers. Our approach was to collect several potentially interesting miRNAs that were previously described in the literature and test them in our set of case-control samples.

Notably, miR-210, which is one of the more commonly recurring miRNAs overexpressed in PE (22,3236), was also elevated in our PE cohort. This particular miR-210 has been identified as a hypoxia-induced miRNA in many cell types and tissues and is consistently upregulated by hypoxia in both physiological and malignant conditions (37,38). Several target genes with roles in mitochondrial metabolism, angiogenesis, and DNA repair have been identified, and most of them may be involved in the pathogenesis of PE. However, it remains unclear whether the differential expression of miR-210 is the consequence or origin of PE even though this particular miRNA has been described as a serum biomarker for PE (32).

There was also a higher level of circulating miR-1233 in the group of women who developed PE compared with the group of women with a normal pregnancy. Our results confirmed those of Ura et al (23), who were the first researchers to identify a potential role for miR-1233, which has already been described in renal carcinoma, in predicting PE. It is important to note that both miR-1233 and miR-210, which are upregulated in PE, are also upregulated in renal cell carcinoma. Of note, in patients with renal cell carcinoma, only miR-1233 was found to be increased (39). Information on the function of miR-1233, located on chromosome 15q14, is incomplete. Several potential target genes have been predicted using TargetScan 6.0 (40), but they have not been validated. The expression level of miR-574-5p was also elevated in the blood of women with PE (21). However, the expression of miR-574-5p has been poorly investigated.

Although there are many studies on PE screening, a biologically predictive and prognostic test with high accuracy for routine clinical use has yet to be identified (4143). The most promising strategies are multiparametric approaches that include a combination of maternal factors, biophysical tests (mean blood pressure, uterine artery Doppler), and biochemical markers (4450). Sequential multiparametric testing is superior to screening in the first trimester alone (51). Nevertheless, a panel of tests is necessary to effectively identify women early in pregnancy who are at the highest risk for developing PE.

Although the prevalence of PE is relatively low and miRNA analysis is technically challenging, further studies with larger cohorts are mandatory. Discriminating between the different phenotypes of PE is also important because they may involve different sets of miRNA expression.

Furthermore, patients were sampled before the onset of PE and delivery (mean:one month before). Indeed, cases were enrolled when there was suspicion of PE, but manifest PE was an exclusion criterion. This protocol may partially explain the reason for only 4 of the 17 selected miRNAs being significantly upregulated.

The fact that four circulating miRNAs (miR-210-3p, miR-210-5p, miR-1233-3p, and miR-574-5p) were differentially expressed in the sera of women who later developed PE compared with women who did not develop PE, confirms the possible pathophysiological role of miRNAs in PE, as previously suggested (19,52,53). Particularly, exploring the role of miR-1233 and miR-574 in PE could enrich our understanding of this disease.

Future research on the biological pathway of circulating miRNAs may enhance our understanding of the pathogenesis of PE and aid in the development of new biomarkers for clinical application. Using these miRNAs in a multiparametric test may also provide a new clinical strategy for identifying women who are at risk for developing PE.


The authors acknowledge Nathalie Lefin and Sophie Kessler for their excellent technical assistance. C.M. is a Research Associate from the Fonds de la Recherche Scientifique-FNRS (F.R.S.-FNRS, Belgium). This study was supported by grants from the Fonds de la Recherche Scientifique-FNRS (F.R.S.-FNRS, Belgium), the Fonds spéciaux de la Recherche (University of Liège), the Fonds Léon Fredericq (University of Liège), the Direction Générale Opérationnelle de l'Economie, de l'Emploi et de la Recherche from the S.P.W. (Région Wallonne, Belgium).








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November 2016
Volume 5 Issue 6

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Munaut, C., Tebache, L., Blacher, S., Noël, A., Nisolle, M., & Chantraine, F. (2016). Dysregulated circulating miRNAs in preeclampsia. Biomedical Reports, 5, 686-692. https://doi.org/10.3892/br.2016.779
Munaut, C., Tebache, L., Blacher, S., Noël, A., Nisolle, M., Chantraine, F."Dysregulated circulating miRNAs in preeclampsia". Biomedical Reports 5.6 (2016): 686-692.
Munaut, C., Tebache, L., Blacher, S., Noël, A., Nisolle, M., Chantraine, F."Dysregulated circulating miRNAs in preeclampsia". Biomedical Reports 5, no. 6 (2016): 686-692. https://doi.org/10.3892/br.2016.779