MicroRNA expression profiles and target prediction in neonatal Wistar rat lungs during the development of bronchopulmonary dysplasia
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- Published online on: September 17, 2015 https://doi.org/10.3892/ijmm.2015.2347
- Pages: 1253-1263
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Copyright: © Xing et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
Introduction
Bronchopulmonary dysplasia (BPD) is a serious respiratory complication, affecting premature infants. In recent years, the administration of antenatal steroids and postnatal pulmonary surfactants, coupled with the advancements in rescue technologies for very low birth weight and extremely low birth weight infants, has meant that the pathological characteristics of BPD have changed so now the disease is characterized as an alveolarization disorder with microvascular dysplasia (1). The reported incidence of BPD is 42% for premature infants with a birth weight between 501–750 g and 25% for those with a birth weight between 751–1,000 g (2). Patients with BPD often have an increased risk of hospital readmission as a result of developing respiratory disorders after discharge and a greater probability of requiring drug intervention (3), and they are also more susceptible to nervous system developmental disorders involving recognition, speech, motion and behavioural problems (4).
The lungs arise from the anterior foregut endoderm, and normal human lung development is commonly divided into five stages: the embryonic stage (4–7 weeks post-conception), pseudoglandular stage (5–17 weeks post-conception), canalicular stage (16–24 weeks post-conception), saccular stage (24–35 weeks post-conception) and alveolar stage (36 weeks post-conception to 2 years postnatal). During the final stage, the secondary septa divide the saccular units, increasing the alveolar number and reducing the alveolar size. The majority of the gas exchange surface is formed during this stage. The alveolar stage is a critical stage in the development of BPD (5,6).
It has been demonstrated that the disruption of the formation of secondary septa and arrested alveolarization in BPD may be caused by the abnormal accumulation of extracellular matrix components (including elastins) and angiodysplasia (7,8). These studies have only partially elucidated the mechanisms responsible for alveolarization arrest in BPD and thus, further investigations are required to fully elucidate the mechanisms responsible for the development of BPD in order to establish effective treatment methods.
MicroRNAs (miRNAs or miRs) are a group of endogenous non-coding RNAs that are 22–25 nucleotides (nt) in length, and their 5′-seed sequence specifically binds to the 3′-UTR base sequence of target mRNAs to cause the degradation or translational suppression of target mRNAs, and thus they play a role in regulating gene expression at the post-transcriptional level (9). Studies have demonstrated that miRNAs participate widely in various life processes, such as cell differentiation, proliferation and apoptosis, as well as organ development, tumorigenesis and immune response, and are highly conserved among species (10,11). It has been confirmed that miRNA expression during lung development changes dynamically, indicating that miRNAs participate in the regulation of lung development (12). miRNAs have also been found to play an important role in the development of lung diseases such as asthma, idiopathic pulmonary fibrosis and lung cancer (13–15).
Studies have revealed the functions of miRNAs in embryonic lung development. miR-17 and its homologous genes miR-20a and miR-106b were found to have high levels of expression during the pseudoglandular stage of lung development (16). In mice with an overexpression of the miR-17–92 cluster, the proliferation of pulmonary epithelial progenitors takes place, but cell differentiation is suppressed, demonstrating an abnormal lethal phenotype (17). The miR-17 family alters E-cadherin expression and distribution, as well as β-catenin activity by regulating STAT3 and MAPK14, which eventually increases the number and area of terminal branches (18). Navarro et al (19) found that let-7 expression was downregulated in the pseudoglandular stage of lung development. Let-7 suppresses the Ras-Raf-MAP kinase pathway and thus, causes a decrease in cell viability and the proliferation rate. Bhaskaran et al (20) found the highest expression level of miR-127 during the late stage of rat embryonic lung development (E21, saccular stage) and that miR-127 expression shifted from mesenchymal cells to epithelial cells during embryonic lung development. In lung tissue cultures, the overexpression of miR-127 resulted in a defect in pulmonary branch formation. Zhang et al (21) observed that A549 cell proliferation was significantly suppressed following transfection with miR-127. Yet, little is known about the role of miRNAs in the regulation of postnatal lung development and in the development of BPD.
Thus, in the present study, we investigated the mechanisms through which miRNAs regulate lung development after birth, as well as the role of miRNAs in the development of bronchopulmonary dysplasia (BPD) using a rat model of BPD induced by hyperoxia.
Materials and methods
Animal models
All animal procedures were approved by the Committee on the Ethics of Animal Experiments of China Medical University, Shenyang, China. All surgeries were performed under chloral hydrate anesthesia, and all efforts were made to minimize animal suffering.
Full-term newborn Wistar rats (purchased from the Experimental Animal Center of Shengjing Hospital of China Medical University, Shenyang, China) were randomly assigned to either the model group (n=45) or the control group (n=45) within 12 h after birth. The neonatal rats in the model group were kept in a glass chamber with an oxygen concentration between 60–85%, monitored continuously by an oxygen analyzer. The newborn rats in the control group inhaled fresh air (21% oxygen). All other conditions and control factors were the same as those of the model group. The nursing rats were exchanged between the 2 groups every 24 h to avoid oxygen toxicity.
Lung tissue preparation
On postnatal days 3, 7 and 14, 15 pups from both groups were anesthetized by intraperitoneal injection of 10% chloral hydrate. The chest of the rats was then opened, and whole lungs were collected. The inferior lobe of the right lung was fixed in 4% paraformaldehyde for hematoxylin and eosin (H&E) staining. The remaining lung tissue was preserved in liquid nitrogen: the left lungs were used for mRNA detection and microarray analysis, while the right lungs were used for western blot analysis. From each group and at each time point, 10 inferior lobes from the right lungs (one from each litter) were randomly selected for morphological evaluation. Five left lungs were randomly selected for the measurement of mRNA expression, while 3 left lungs were selected for microarray analysis and 5 right lungs were selected for the measurement of protein expression.
Lung histology
The inferior lobes from the right lungs were fixed in 4% paraformaldehyde for 24 h, and then dehydrated in gradient ethanol, vitrified in xylene and embedded in paraffin. The paraffin-embedded sections (4-µm-thick) were stained with H&E. Morphological changes were evaluated using an optical microscope (×40 magnification; AX70+U-PHOTO; Olympus, Tokyo, Japan). Ten fields were randomly selected for analysis from each section. The radial alveolar count (RAC) was counted with a method developed by Emery and Mithal, as described in our previous study (22), to assess the level of alveolarization. The counting was carried out by 2 independent pathologists who were blinded to the experimental design.
Western blot analysis
The protein expression levels were determined using rabbit polyclonal anti-proliferating cell nuclear antigen (PCNA) antibody (ab2426, 1:200 dilution) and anti-platelet endothelial cell adhesion molecule-1 (PECAM-1, also known CD31) antibody (ab32457, 1:1,000 dilution) (both from Abcam, Cambridge, UK). Briefly, total protein extracted from lung tissue was quantified using a BCA protein assay kit, 20 µl of protein was then loaded onto a 12% SDS-PAGE gel and transferred onto polyvinylidene difluoride membranes (Millipore, Billerica, MA, USA). The membranes were blocked with 5% skimmed milk for 1 h, then incubated with anti-PCNA or anti-CD31 antibody diluted in PBS overnight at 4°C. After being washed in Tris-buffered saline + 1% Tween-20 (TBST), the membranes were incubated for 2 h with horseradish peroxidase-conjugated secondary antibody and then imaged using enhanced chemiluminescence reagents. The density of the protein bands was analyzed using ImageJ software. GAPDH was used as an internal control.
RNA extraction
Total RNA was isolated following the manufacturer's instructions using TRIzol reagent (Invitrogen, Carlsbad, CA, USA) and the miRNeasy mini kit (Qiagen, Hilden, Germany). It was then qualified and quantified using a NanoDrop spectrophotometer (ND-1000; NanoDrop Technologies, Wilmington, DE, USA).
Reverse transcription-quantitative polymerase chain reaction (RT-qPCR)
A total of 1 µg of RNA was reverse-transcribed into cDNA using the PrimeScript™ RT reagent kit (Takara Biotechnology, Dalian, China), according to the manufacturer's instructions. qPCR was performed on a LightCycler (Applied Biosystems 7500 Fast Real-Time PCR System; Applied Biosystems, Carlsbad, CA, USA). Appropriate primers were designed using Primer Premier 5.0 software (Premier Biosoft International, Palo Alto, CA, USA) and the primer sequences are listed in Table I. The reaction was carried out at 95°C for 30 sec, 60°C for 34 sec, and 72°C for 1 min for 40 cycles. The relative transcript levels were normalized to GAPDH and evaluated using the ΔΔCT method.
miRNA microarray
We used the seventh generation of the miRCURY™ LNA array (v.18.0) (Exiqon, Vedbaek, Denmark), which covered all rat miRNAs in the miRBase 18.0, to detect the expression of miRNAs in rat lungs.
RNA labeling
Total RNA was labeled with the miRCURY™ Hy3™/Hy5™ Power labeling kit (Exiqon) according to the manufacturer's instructions. Briefly, 1 µg of RNA was added to the mixture of 1.0 µl of CIP buffer and 1.0 µl of CIP (Exiqon), incubated for 30 min at 37°C and terminated by incubation for 5 min at 95°C. Subsequently, 3.0 µl of labeling buffer, 1.5 µl of fluorescent label (Hy3™), 2.0 µl of DMSO and 2.0 µl of T4 RNA ligase were added to the mixture. The labeling reaction was incubated for 1 h at 16°C and terminated by incubation for 15 min at 65°C.
Array hybridization
The Hy3™-labeled samples were hybridized with the miRCURY™ LNA array (v.18.0), according to the manufacturer's instructions. A total of 25 µl of samples, mixed with the equivalent amount of hybridization buffer, was first denatured for 2 min at 95°C, incubated on ice for 2 min, and then hybridized to the microarray for 16–20 h at 56°C. The 12-Bay Hybridization system (Nimblegen Systems, Inc., Madison, WI, USA) controls active mixing action and temperature, enabling uniform hybridization and an enhanced signal. Subsequently, the slides were washed several times with the wash buffer kit (Exiqon), dried by centrifugation at 400 rpm for 5 min, and then scanned using an Axon GenePix 4000B microarray scanner (Axon Instruments, Foster City, CA, USA).
Data analysis
Grid alignment and data extraction were carried out using GenePix Pro 6.0 software (Axon Instruments). Replicated miRNAs were averaged, and miRNAs with intensities of ≥30 were selected from all the samples for calculation of the normalization factor. Data were normalized with a median normalization. Significantly differentially expressed miRNAs between the 2 groups were then confirmed with volcano plot filtering. Hierarchical clustering was accomplished with MEV software (v4.6, TIGR).
miRNA target prediction
The significantly differentially expressed miRNAs were ran through 3 online databases, miRBase (http://www.ebi.ac.uk/enright-srv/microcosm/htdocs/targets/v5/), miRanda (http://www.microrna.org/microrna/home.do) and miRDB (http://mirdb.org/miRDB/) for target prediction. The overlapping section was obtained from these databases.
Statistical analysis
We used SPSS17.0 software for statistical analysis. Values are presented as the means ± standard deviation (SD); statistical significance was determined using the Student's t-test. A P-value of <0.05 was considered to indicate a statistically significant difference.
Results
Histology
On postnatal day 3, the alveolar wall in the model group was slightly thicker than that of the control group (Fig. 1A and B). By day 7, the number of alveoli had significantly decreased, and the formation of the secondary septa was reduced; the alveolar size was also slightly increased in the model group (Fig. 1C and D). On day 14, the following changes between the 2 groups became more apparent: thickening of the alveolar wall, a decrease in the number of alveoli, reduced numbers of secondary septa, and alveolar structural abnormalities (Fig. 1E and F). Compared with the control group, the RAC value in the BPD model group had markedly decreased by postnatal day 7 (P<0.05), and the difference between the 2 groups was even greater by day 14 (P<0.01) (Fig. 2). These results indicated that the formation of secondary septa was impaired and that alveolarization was suppressed in the rats in the model group, indicative of BPD.
Expression of PCNA and CD31 in rat lung tissue
The mRNA and protein expression levels of PCNA and CD31 in the model group were significantly lower than those in the control group on postnatal days 3, 7 and 14 (CD31: P<0.05 on day 7; P<0.01 at the other time points; PCNA: P<0.05 at all time points) (Fig. 3). A similar effect was observed in the protein expression levels (PCNA: P<0.05 on day 3; P<0.01 at the other time points; CD31: P<0.05 at all time points) (Fig. 4).
miRNA expression profiles in rat lung tissue
A total of 50 differentially expressed miRNAs passed the fold change and t-test filter between the 2 groups (fold change >2.0; P<0.05), and the upregulated and downregulated miRNAs are listed in Tables II and III, respectively.
We identified 1 downregulated miRNA (miR-377-3p) and 2 upregulated miRNAs (miR-490-3p and miR-1193-3p) on postnatal day 3 in the model group compared to the control group (M3d vs. C3d); 11 downregulated miRNAs (miR-542-5p, miR-99a-3p, miR-139-5p, miR-208a-3p, miR-33-5p, miR-190a-5p, miR-335, miR-708-3p, miR-15b-5p, miR-674-3p and miR-188-5p) and 1 upregulated miRNA (miR-3584-3p) on day 7 in the model group compared to the control group (M7d vs. C7d); and 16 downregulated miRNAs (miR-181c-3p, miR-465-5p, miR-382-5p, miR-208a-3p, miR-351-5p, miR-503-3p, miR-127-3p, miR-664-2-5p, miR-298-5p, miR-376a-3p, miR-186-5p, miR-134-3p, miR-92a-3p, miR-378a-3p, miR-541-5p and miR-154-5p) and 19 upregulated miRNAs (miR-34c-3p, let-7b-5p, miR-3068-5p, miR-872-5p, miR-183-5p, miR-33-5p, miR-182, miR-322-3p, miR-340-3p, miR-142-3p, miR-141-5p, miR-96-5p, let-7f-5p, miR-15b-5p, miR-449a-5p, miR-22-5p, miR-362-3p, miR-301a-3p and miR-365-3p) on day 14 in the model group compared to the control group (M14d vs. C14d).
We also identified miRNAs with a change in expression during septation in both groups by making comparisons of the 2 groups (model and control group) between days 14 and 3 (FC≥2, P<0.05). We found that compared with the control group on day 3 (C3d), 27 miRNAs were upregulated, and 20 were downregulated in the control group on day 14 (C14d); compared with the model group on day 3 (M3d), 19 miRNAs were upregulated, whereas 26 were downregulated in the model group on day 14 (M14d). The upregulated and downregulated miRNAs in the 2 groups on day 14 compared to day 3 are listed in Table IV.
Hierarchical clustering was carried out to illustrate the distinguishable miRNA expression profiles between the 2 groups at different time points. The heatmap is shown in Fig. 5.
Target prediction
The target genes for 36, 38 and 46 miRNAs were successfully predicted using the miRBase, miRanda and miRDB databases, respectively. Each miRNA had one or more predicted target genes. The overlapping section of the 3 databases contained target genes for 32 miRNAs (Table V).
Discussion
BPD is a common respiratory disease affecting premature infants. In recent years, due to the increasing rescue success rates for very low birth weight and extremely low birth weight infants, as well as the wide application of pulmonary surfactants, extremely premature infants with a gestational age lower than 28 weeks have become the major group experiencing BPD. These infants were born towards the end of the canalicular stage or at the saccular stage of lung development; therefore, the entire alveolarization and microvascularization process occurred postnatally. This is different from the 'old BPD', as suggested by Northway et al (23), which mainly manifested with 'acute lung injury, pneumonedema, extensive airway epithelial metaplasia, pulmonary fibrosis, and airway and vascular smooth muscle hyperplasia'. The 'new BPD', in these extremely premature infants is characterized by 'alveolar hypoplasia and impaired pulmonary vascular development' (1).
In the present study, we found that the RAC value in the BPD model group was markedly decreased by postnatal day 7 (P<0.05) as compared with the control group, and that the difference between the 2 groups was even greater by day 14 (P<0.01). This indicated that the formation of secondary septa was impaired and that alveolarization was suppressed in the model of BPD. The results from western blot analysis and RT-qPCR for PCNA expression revealed that the expression levels in the model group were lower than those in the control group by postnatal day 3, and this difference persisted and reached a peak by day 14. This suggests that cell proliferation may be suppressed in BPD. Similarly, CD31 expression was lower in the model group than in the control group at all time points, indicating that vascular development may be suppressed in the model group.
The role of miRNAs in BPD has been previously investigated using microarray assays (21,24,25), and the results were partially consistent with ours. For example, Bhaskaran et al (24) and Zhang et al (21) found that the expression level of miR-335 was downregulated, and Zhang et al also observed the upregulation of miR-449a and let-7f expression. There are few studies available which have investigated the association between miRNAs and BPD. Bhaskaran et al (24) confirmed that one of the miR-150 targets was glycoprotein nonmetastatic melanoma protein b (GPNMB), which may participate in the regulation of angiogenesis. Narasaraju et al (26) further confirmed the regulatory role of miR-150 in angiogenesis in BPD. Dong et al (25) found that miR-29 expression was upregulated in BPD and suggested that miR-29 may suppress lung development by inhibiting Ntrk2. However, we failed to detect these 2 miRNAs, possibly due to the different animal species and modeling method used. Most of the other miRNAs that had expression changes have not been previously reported in studies of BPD to the best of our knowledge.
In rats, alveolarization occurs mainly during postnatal days 5–14. By postnatal day 3, alveolarization has not yet begun, so we observed only a few differentially expressed miRNAs between the 2 groups. To date, downregulated miR-377-3p and upregulated miR-1193-3p have not been reported, to the best of our knowledge. Gu et al found that the overexpression of miR-490-3p in the A549 cell line had an effect on the targeted downregulation of CCND1 expression. As CCND1 plays an important role in the G1/S transition, the cell cycle was arrested in the G1 phase, and thus, cell proliferation was suppressed (27).
In our study, alveolarization reached a peak 7 days after birth when the difference in miRNA expression between the 2 groups was significant. The upregulation of miR-3584-3p has not yet been reported to the best of our knowledge. The expression of the following miRNAs was downregulated: miR-542-5p, miR-99a-3p, miR-139-5p, miR-208a-3p, miR-33-5p, miR-190a-5p, miR-335, miR-708-3p, miR-15b-5p, miR-674-3p and miR-188-5p. Bray et al (28) found that miR-542-5p had a tumor inhibitory effect on neuroblastoma. In colorectal cancer, esophageal cancer and breast cancer, the mechanisms of action of miR-139-5p as a tumor inhibitory factor have also been reported (29–32). Wang et al (33) observed the downregulated expression of miR-335 in NSCLC tissues and an increased apoptotic rate in the miR-335-transfected cell line. In the same study, miR-355 was shown to suppress the invasive ability of tumor cells through the targeted regulation of Bcl-w and SP1. Other downregulated miRNAs have not yet been reported to the best of our knowledge.
By postnatal day 14, alveolarization was almost complete, and the manifestations of BPD were also observed in the lung tissues of the model group. In addition, differences in the miRNA expression levels between the 2 groups were increasingly apparent. Now, it is widely recognized that the pulmonary microvascularization stage begins on postnatal day 14, during which the double layers of the microvascular network in the normal secondary septa will fuse into one layer. Therefore, differentially expressed miRNAs on day 14 may also be associated with the failure of microvascularization caused by the absence of secondary septa in the BPD model group. Jiang et al found that downregulated miR-127-3p inhibited the proliferation of tumor cells in malignant glioma by suppressing SKI and activating the TGF-β signaling pathway, and promoted metastasis through the targeted inhibition of SEPT7 (34,35). Zha et al found that miR-134-3p inhibited tumor metastasis in hepatocellular carcinoma through the targeted regulation of ITGB1 (36). The decreased expression of miR-378a-3p in colorectal cancer has been shown to increase the phosphorylated ERK1/2 protein level (37), and the downregulated expression of miR-378a-3p is also present in rhabdomyosarcoma (38). Both these studies suggest that miR-378a-3p suppresses tumor growth by inhibiting the expression of the target gene, IGF1R. Of the upregulated miRNAs, miR-34c-3p caused the arrest of glioma cells in the S phase, reduced the number of cells in the G0/G1 phase, and induced cell apoptosis (39). miR-34c-3p caused SiHa cells to arrest in the S phase and to undergo apoptosis, and inhibited metastasis and invasion in cervical cancer (40). Similarly, let-7b-5p inhibited the proliferation of multiple myeloma cells through the targeted regulation of IGF1R and promoted cell cycle arrest and apoptosis (41). Zhu et al (42) found that hsa-miR-182 was highly expressed in pulmonary adenocarcinoma, which led to the inhibition of cell proliferation through the downregulation of RASA1. Stenvold et al (43) found that the expression of miR-182 was well correlated with FGF2, HIF2α and MMP-7 in NSCLC, indicating its possible role in angiogenesis. Patients with squamous cell carcinoma (SCC) and stage II patients, expressing high levels of miR-182 had a better prognosis. Yang et al (44) observed the role of miR-182 in the targeted regulation of FOXO3 and found that in early-stage lung cancer, Sp1 stimulated miR-182 expression and led to the downregulated expression of FOXO3, thus allowing tumor growth. In advanced lung cancer, Sp1 and miR-182 were both downregulated, while FOXO3 expression was upregulated, leading to lung cancer metastasis. Wang et al (45) found that PDCD4 was also one of the target genes for miR-182. miR-182 was upregulated in the lung cancer cell lines, A549 and SPC-A-1, which resulted in a decrease in PDCD4 expression, thus weakening the inhibitory effect of PDCD4 on tumor growth. Zhang et al (46) observed that miR-182 inhibited tumor cell proliferation and promoted tumor cell apoptosis through the targeted regulation of the cortactin (CTTN) gene. In the miR-182-transfected A549 cell line, most cells were arrested in G0/G1 phase, and the percentages of cells in the S and G2/M phase were greatly decreased. Sun et al (47) found that RGS17 was a target gene of miR-182 and that the overexpression of transfected miR-182 inhibited RGS17 mRNA transcription and thus, suppressed tumor cell proliferation, leading to the recurrence of cell adherence. Lei et al (48) observed that the high expression of TGF-β1 in NSCLC upregulated miR-142-3p expression, and the latter targeted TGF-βR1, thus inhibiting its expression, weakening SMAD3 phosphorylation, and promoting tumor growth. Carraro et al (49) found that miR-142-3p kept the balance between the proliferation and differentiation of mesenchymal cells during lung development. miR-142 participated in the regulation of the Wnt-CTNNB1 pathway (Apc binds to CTNNB1 to induce its ubiquitination and degradation) by binding to Apc mRNA, and its downregulation promoted the differentiation of parabronchial smooth muscle ancestral cells. In colorectal cancer cells, miR-96-5p decreased cyclin D1 expression but increasesd p27-CDKN1A expression through the targeted regulation of KRAS, thus slowing cell growth (50). miR-96-5p regulated GPC1 to inhibit the proliferation of pancreatic cancer cells (51). Other miRNAs have not yet been reported to the best of our knowledge.
During septation, compared with the control group on day 3 (C3d), 27 miRNAs were upregulated, and 20 were downregulated in the control group on day 14 (C14d); compared with the model group on day 3 (M3d), 19 miRNAs were upregulated, while 26 were downregulated in the model group on day14 (M14d) (Table IV). Several miRNAs were shared by the model and control groups, including highly upregulated miR-143-5p and miR-222-3p and markedly downregulated miR-542-5p and miR-503-5p. These data demonstrated similarities between septation in the 2 groups during, suggesting that these miRNAs play an important role during septation, despite the cause of the injury related to hyperoxia.
Three online databases were used to predict the target genes of 32 differentially expressed miRNAs, according to the base sequence complementation principle, and some miRNAs even helped to predict several target genes (Table V). However, the prediction results were not able to indicate the actual presence of these targeted regulations in vivo. Regarding the regulation of miRNA in other diseases, the target genes of some miRNAs have been confirmed experimentally, for example, Sept7 is the target gene of miR-127-3p (40), while CTTN is the target gene of rno-miR-182 (51). Some target genes that were confirmed in previous studies were not found in our results, possibly because we only selected the intersection set of results from three databases, so some target molecules may have been missed. In the future, we may construct luciferase reporter vectors for the miRNA of interest to further validate the targeted relationships between miRNA and the predicted genes.
In conclusion, the majority of the miRNAs we found still play an unknown role in the development of BPD, and some of them have not been previously reported to the best of our knowledge. Currently available data also revealed that the regulation of miRNA is complex regarding life processes. Further study is necessary to understand the effects of miRNA in the development of BPD.
In this study, we screened possible miRNAs that participated in the development of BPD during the alveolar septation phase using microarray assays and identified the important role of miRNAs in the development of normal lungs and BPD. In the future, we aim to further investigate the functions of these miRNAs, in order to broaden our understanding of the pathogenesis of BPD.
Acknowledgments
This study was supported by grant from the Natural Science Foundation of China (no. 81471489).
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