GATA2‑miR‑374a axis promotes vascular smooth muscle cells proliferation, migration via targeting circTADA2A/RORA axis
- Authors:
- Published online on: July 8, 2024 https://doi.org/10.3892/etm.2024.12646
- Article Number: 357
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Copyright: © Tu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
miRs) play key roles in biological functions of vascular smooth muscle cells (VSMCs). However, the role of miR‑374a in VSMCs remains to be elucidated. The present study aimed to explore the influence of miR‑374a on VSMCs and its molecular mechanism. The expression level of miR‑374a was measured by reverse transcription‑quantitative (RT‑q) PCR. MTT and Transwell assay were employed to assess the role of miR‑374a in proliferation and migration of VSMCs. To order to determine miR‑374a targets, a dual‑luciferase reporter assay was conducted, which was further verified by rescue experiments. Chromatin Immunoprecipitation Assay and JASPAR databases were applied to explore the regulatory association between GATA binding protein 2 (GATA2) and miR‑374a. Western blotting or RT‑qPCR were employed to detect the protein expression levels of GATA2 or RAR‑related orphan receptor A (RORA). The present study found that miR‑374a was elevated in VSMCs following treatment with platelet‑derived growth factor‑BB (PDGF‑BB) compared with that in control group. In addition, the results demonstrated that a higher expression of a miR‑374a could promote proliferation and migration of VSMCs while miR‑374a inhibitor suppressed the PDGF‑BB‑induced proliferation and migration of VSMCs in vitro. Furthermore, circTADA2A bound to miR‑374a and then upregulated RORA expression, which resulted in inhibition in VSMCs proliferation and migration. On the other hand, the result indicated that GATA2 overexpression could augment the proliferation, migration of PDGF‑bb‑induced VSMCs, which could be rescued by miR‑374a inhibitor. The findings suggested that the GATA2/circTADA2A‑miR‑374a axis promoted the proliferation and migration of VSMCs by targeting RORA, which were closely related to atherosclerosis (AS). Thus the results might offer a new therapeutic target for AS.
Introduction
Atherosclerosis (AS), a chronic inflammatory disease, is featured by forming of atherosclerotic plaques in the arterial wall (1,2), which may lead to various diseases including coronary artery disease and stroke as well as cerebrovascular disease (3-5), producing high morbidity and mortality worldwide (6). Increasing evidence has indicated that abnormal proliferation and migration of VSMCs play a crucial role in the progression of AS (7,8). Therefore, it is urgently necessary to explore the molecular pathogenesis of VSMCs in AS and to find significant therapeutic targets for the suppression of VSMCs development.
microRNAs (miRNAs/miRs) are small non-coding single-stranded RNAs with ~22 nucleotides that show key regulatory roles by post-transcriptionally targeting mRNAs of target genes (9). Studies have reported that miRNAs are tightly involved in the progression of VSMCs, for example, Farina et al (10) suggested that miR-128-3p was a novel regulator of VSMCs phenotypic switch and vascular diseases. Wang et al (11) indicated that CTBP1-AS2 inhibited proliferation and induces autophagy in ox-LDL-stimulated VSMCs through regulating miR-195-5p/ATG14. You et al (12) found that overexpression of miR-29a-3p suppressed proliferation, migration of VSMCs in atherosclerosis via targeting TNFRSF1A. Jing et al (13) suggested that LINC00472 regulated VSMCs migration and proliferation by regulating miR-149-3p. Additionally, various studies reported that miR-374a played important roles in cancer progression. For example, Hao et al (14) found that LINC-PINT suppressed tumor cell proliferation, migration by targeting miR-374a-5p in ovarian cancer. Lu et al (15) identified that miR-374a promoted the proliferation of osteosarcoma cell proliferation via targeting Axin2. Ma et al (16) indicated that miR-374a could promote pancreatic cancer cell proliferation and epithelial to mesenchymal transition by targeting SRCIN1, whereas the potential role of miR-374a in VSMCs proliferation, migration remains to be elucidated.
The present study aimed to explore the effect of miR-374a on the proliferation and migration of VSMCs, and the underlying mechanism.
Materials and methods
Cell culture and transfection
The Human Brain Vascular Smooth Muscle Cells (HBVSMCs) were bought from Sciencell Research Laboratories, Inc. (cat. no. sc-1100) and the cells were maintained in Dulbecco's Modified Eagle's Medium (DMEM) supplemented with 10% FBS (Gibco; Thermo Fisher Scientific, Inc.), 1% penicillin and 1% streptomycin (Gibco; Thermo Fisher Scientific, Inc.) with an atmosphere of 5% CO2 at 37˚C.
The isolation and culture of primary mouse VSMCs were performed according to previous protocol (17). Briefly, mVSMCs were isolated from the aorta (from the aortic arch to the iliac bifurcation) of two 6-week-old, male, C57BL/6J mice (weight, 20 g; at 20˚C, with a light/dark cycle of 10/14 h and humidity of 55%; Charles River Laboratories International, Inc.) and plated in DMEM supplemented with 20% FBS, 1% penicillin and 1% streptomycin at 37˚C in a humidified atmosphere of 5% CO2.
The miR-374a mimics (50 nM), miR-374a inhibitors (50 nM) and respective controls (50 nM) were bought from Guangzhou RiboBio Co., Ltd. The pcDNA (Vector) and pcDNA-RAR-related orphan receptor A (RORA)/GATA2 overexpression (RORA-OE/GATA2-OE) plasmids were purchased from Guangzhou RiboBio Co., Ltd. Plasmid cloning DNA (Wild-type), miR-374a mimics or inhibitors as well as the respective controls (empty/inhibitor-NC/mimic-NC) were first mixed with Opti-MEM (Invitrogen; Thermo Fisher Scientific, Inc.), incubated for 5 min at 37˚C, co-incubated with Lipofectamine® 3000 (Invitrogen; Thermo Fisher Scientific, Inc.) for 20 min and transfected into cells for 72 h at 37˚C according to the manufacturer's instructions. Follow-up experiments were conducted 2 days later. PDGF-BB (MilliporeSigma) was adopted as a concentration gradient assays to identify the final intervention dose. The sequences of the miRNA mimic/inhibitor and miR-NCs are shown in Table I.
Reverse transcription-quantitative (RT-qPCR)
Total RNA was extracted from VSMCs with TRIzol® reagent (Thermo Fisher Scientific, Inc.) on the basis of manufacturer's instructions (90% density of cells used for RNA extraction). Next, the isolated RNA was reverse-transcribed by the cDNA Synthesis Kit (Takara Bio, Inc.) in accordance to the manufacturer's instructions. PCR amplification was carried out based on the protocols of SYBR Premix Ex Taq™ II (Takara Bio, Inc.). U6 and GAPDH were employed as housekeeping genes of miRNAs or mRNAs, and the results were assessed with 2-ΔΔCq method (1). The conditions for PCR cycling were as follows: Activation of TaqMan at 95˚C for 10 min, and then 40 cycles of denaturation at 95˚C for 10 sec, and annealing/extension at 60˚C for 60 sec. The experiments were repeated three times. The primers for RT-qPCR are in Table I.
Nucleic acid electrophoresis and Sanger sequencing
PCR products were separated by electrophoresis on a 2% agarose gels, and gels were cut and sent to Shanghai Sangon Bioengineering Co., Ltd., for sequencing following observation in a UV imaging system.
RNase R and actinomycin D Assays
RNase and actinomycin D assays were used to determine the RNA stability. For the RNase R assay, 2 µg RNA was treated with 3 U/µg RNase R (BioVision, Inc.; Abcam) or diethylpyrocarbonate-treated water (control) at 37˚C for 30 min. Thereafter, RNA was extracted using an RNeasy MinElute Cleaning Kit (Qiagen, Inc.) and subjected to RT-qPCR quantification as aforementioned. For the actinomycin D assay, cells were treated with 2 µg/ml actinomycin D (Shanghai Aladdin Biochemical Technology Co., Ltd.) to halt RNA synthesis. The remaining RNA in the cells was extracted and subjected to RT-qPCR quantification as aforementioned.
Western blotting
Total protein of VSMCs was extracted using RIPA lysis buffer (Beyotime Institute of Biotechnology) and the protein concentrations were measured via a protein assay kit (Boster Biological Technology) according to the manufacturer's protocol. Proteins (20 µg) were separated on a 10% gel using SDS-PAGE and then transferred to PVDF membrane (MilliporeSigma). After being blocked using 5% skimmed milk in TBST (0.1% Tween) buffer at room temperature for 1 h, the membrane was incubated with primary antibodies (GAPDH; 1:5,000; cat. no. ab8245; Abcam; RORA; 1:1,000; cat. no. ab256799; Abcam; GATA2; 1:2,000; cat. no. ab109241; Abcam) overnight at 4˚C. After that, membranes were incubated using a peroxidase-conjugated secondary antibody (cat. no. 58802; 1:1,000; Cell Signaling Technology, Inc.) for 1 h at room temperature. Finally, chemiluminescent detection was carried out with the ECL system (MilliporeSigma) and analyzed using the ChemiDoc™ XRS Molecular Imager 3.0 system (Bio-Rad Laboratories, Inc.).
MTT assay
MTT assay was performed to assess cell proliferation ability. The VSMCs were seeded in 96-well plates (2x103 cells/well). MTT solution (20 µl) was added to each well for 1, 2, 3, 4 and 5 days respectively. After incubation for 4 h at 37˚C, 100 µl of dimethyl sulfoxide was added into each well to dissolve the precipitate. The absorbance was detected at 490 nm with a microplate reader (Molecular Devices, LLC). The assay was conducted in triplicate.
EdU cell proliferation assay
Cell proliferation was detected using the EdU assay kit (Guangzhou RiboBio Co., Ltd.). Briefly, cells were seeded into 96-well plates at a density of 1x104 cells/well. The OS cells were then treated with culture medium containing 50 µM EdU reagent at 37˚C for 2 h, and fixed with 4% formaldehyde for 30 min at room temperature. The nuclei were stained with Hoechst 33342 (10 µg/ml; cat. no. HY-15559; MedChemExpress). Finally, the results were photographed using a fluorescence microscope (Nikon Corporation), and the number of EdU-positive cells were quantified and analyzed.
Transwell assay
The capacity of cell migration was evaluated by Transwell assay. The cell suspension with serum-free media was added to an upper chamber, whereas the full media containing 30% FBS were seeded to the lower chamber. Following that, cells that transferred to the lower chamber were fixed using 4% paraformaldehyde for 20 min at room temperature and stained applying 0.1% crystal violet for 15 min at room temperature and counted using a light microscope (Olympus Corporation; x200 magnification). A total of five fields of view were randomly selected for the images.
TUNEL staining assay
Apoptosis in VSMCs was detected using the One Step TUNEL Apoptosis Assay Kit (Nanjing KeyGen Biotech Co., Ltd.) according to the manufacturer's protocol. Briefly, cells were fixed by 4% paraformaldehyde for 10 min at room temperature and permeabilized by 0.25% Triton-X 100 for 30 min at room temperature. Cells were then subjected to TUNEL staining reagents, and nuclei were counterstained with DAPI for 30 min at room temperature. Images of TUNEL and DAPI-positive cells were obtained using a fluorescence microscope (BX63; Olympus Corporation).
Luciferase reporter assay
The specific binding linkage between miR-374a and RORA 3'UTR, PMIR-REPORT luciferase vector (Guangzhou RiboBio Co., Ltd.) with wild-type-RORA-3'UTR (Wt-RORA-3'UTR) or mutant (Mut)-RORA-3'UTR, miR-374a mimic or miR-374a inhibitors or miR-NC (Guangzhou RiboBio Co., Ltd.) was transfected into VSMCs, respectively, co-incubated with Lipofectamine® 3000 (Invitrogen; Thermo Fisher Scientific, Inc.) for 48 h at 37˚C. The measurement of the luciferase activity was conducted with Dual-Luciferase Reporter Assay (Promega Corporation) after 24 h. All experiments were conducted in triplicate. Renilla luciferase activity was used for normalization. The sequences of the miRNA mimic/inhibitor and miR-NCs are shown in Table I.
Chromatin immunoprecipitation (ChIP) assay
ChIP assay was performed in VSMCs cells (90% density in a 15-cm Petri dish) with a ChIP assay kit (MilliporeSigma) based on the manufacturer's instructions. The amount of lysate per reaction was 100 µl, with 10 µl (1%) supernatant removed as the input, as previously described (18). Immunoprecipitation was conducted using the anti-GATA2 antibody (dilution, 1:100; cat. no. ab109241; Abcam) or the control IgG at 4˚C overnight. The precipitates were washed with low-salt wash buffer, high-salt wash buffer and LiCI wash buffer, and rinsed with TE buffer twice. The primer for qPCR is in Table I. The qPCR was performed as aforementioned.
Statistical analysis
Analysis of results was conducted using GraphPad Prism 5 (Dotmatics). All data was shown as mean ± SD. The significance of differences between two groups was evaluated via Student's unpaired t-test, and the comparison among multiple groups was conducted via one-way ANOVA followed by Tukey's post hoc test. P<0.05 was considered to indicate a statistically significant difference.
Results
miR-374a is elevated in PDGF-bb-induced VSMCs
MTT assay was applied to assess whether PDGF-bb could promote the proliferation viability of VSMCs and RT-qPCR assay was used to detect the expression level of miR-374a. The result of VSMCs and mVSMCs viability exhibited a significant increase following treatment using 20 ng/ml PDGF-bb in comparison to that in control group and the cell viability was clearly promoted over time (Fig. 1A). As demonstrated in Fig. 1B, the augment of VSMCs viability induced by various concentrations of PDGF-bb also showed concentration-dependence. The expression of miR-374a was significantly increased in VSMCs treated with 20 ng/ml PDGF-bb in a time-dependence manner compared with control group (Fig. 1C). Additionally, PDGF-bb promoted the level of miR-374a in a concentration-dependent method (Fig. 1D).
Upregulation of miR-374a promotes proliferation, migration of VSMCs in vitro
To investigate the function of miR-374a in the progression of VSMCs, HBVSMCs and mVSMCs were transfected with miR-374a mimic or miR-374a inhibitor and the level of miR-374a was overexpression following transfection using miR-374a mimic was detected. Meanwhile, miR-374a was downregulated following transfection with miR-374a inhibitor (Fig. 2A). As expected, upregulation of miR-374a could clearly facilitate the proliferation, migration of VSMCs compared with that in control groups, while, downregulation of miR-374a had a reverse effect (Fig. 2B-D). Furthermore, the result showed that high miR-374a expression reduced the number of TUNEL-positive cells in HBVSMCs and mVSMCs, whereas, miR-374a inhibitor produced a reverse result (Fig. 2E), indicating that miR-374a demonstrated a promoting role in cell proliferation and metastasis of VSMCs.
miR-374a is a direct target of circTADA2A in VSMCs cells
Previous studies have reported that miR-374a can sponge hsa_circ_0043278(19) and it was hypothesized whether miR-374a also adsorbed hsa_circ_0043278 in VSMCs. A schematic diagram illustrated the formation of hsa_circ_0043278 derived from the TADA2A gene exon 5 and 6 (Fig. 3A). The circular properties of hsa_circ_0043278 (named circTADA2A) was identified with divergent primers and convergent primers, respectively (Fig. 3B). Moreover, their head-to-tail splicing structure was confirmed by Sanger sequencing (Fig. 3C). Under RNase R treatment, the linear form of TADA2A was significantly reduced compared with mock, while circTADA2A was significantly resistant to RNase R in HBVSMCs and mVSMCs (Fig. 3D and E). The expression of circTADA2A was significantly reduced in HBVSMCs and mVSMCs treated with various concentrations of PDGF-bb, which also showed concentration-dependence manner compared with control group (Fig. 3F and G). The RT-qPCR results showed the miR-374a mimics significantly reduced the expression of circTADA2A, and miR-374a inhibitor increased the expression of circTADA2A (Fig. 3H). Thus, these data suggested that miR-374a might be the target of circTADA2A, and the potential binding site between circTADA2A and miR-374a is shown in Fig. 3I. Accordingly, the luciferase reporter assays demonstrated that the relative luciferase activity of circTADA2A wild type (WT) and miR-374a mimic group was significantly lower than that of other groups (Fig. 3J and K).
It was subsequently investigated whether circTADA2A plays an inhibitory role in the progression of VSMCs by sponging miR-374a. First, the circTADA2A overexpression vectors and sh-circTADA2A were transfected into HBVSMCs and mVSMCs to upregulate or downregulate circTADA2A expression. The efficiency of transfection was confirmed by RT-qPCR (Fig. 4A). The HBVSMCs and mVSMCs were co-transfected with miR-374a mimics and circTADA2A overexpression vectors. As expected, circTADA2A overexpression significantly blocked the promoting effect of miR-374a mimics on cell proliferation and migration ability in HBVSMCs and mVSMCs (Fig. 4B-D). Taken together, these data indicated that circTADA2A acts as a miRNA sponge for miR-374a in VSMCs.
RORA is specifically regulated by miR-374a in VSMCs
Next, the present study explored how miR-374a exerted its roles in VSMCs. A total of nine common target genes were revealed on the basis of overlapping analysis of DEGs among miRWalk predicted, miRWalk validated and StarBase sets according to the miRWalk website (Fig. 5A). It was found that the expression level of RORA in HBVSMCs was significantly reduced in comparison to that in control groups (Fig. 5B). Furthermore, the result of western blotting in Fig. 5C showed a similar result. Afterwards, StarBase database was used to predict the potential binding site of miR-374a to RORA (Fig. 5D). Luciferase reporter assay was adopted to further verify the association between miR-374a and RORA. Luciferase activity results indicated that the luciferase activity of miR-374a mimic and RORA wildtype co-transfected VSMCs was apparently reduced, whereas no obvious change was found in the luciferase intensity in mutant RORA (Fig. 5E). The results suggested that RORA expression was negatively regulated by miR-374a. Subsequently, it was discovered that miR-374a upregulation clearly augmented the proliferation and metastasis of VSMCs, which could be apparently reversed by RORA increase. In addition, it was also found that circTADA2A knockdown reversed the effects of RORA overexpression on VSMCs proliferation and metastasis (Fig. 5F and G). Additionally, it was observed that high miR-374a expression could reduce the number of TUNEL-positive cells in VSMCs, and the effect was significantly rescued by RORA overexpression, while downregulated circTADA2A expression antagonized the effect of the RORA overexpression (Fig. 5H). These results indicated that circTADA2A regulated the proliferation and metastasis of VSMCs via miR-374a/RORA axis.
GATA2 transcriptionally promotes miR-374a expression
To clarify the upstream regulatory molecule of miR-374a, JASPAR software was used to predict transcription factors (TFs) that modulated miR-374a promoters. RT-qPCR assay was performed to measure the expression level of the top five potential TFs that regulated miR-374a. The results of RT-qPCR indicated that the expression level of GATA2 was much higher in HBVSMCs and mVSMCs than in controls (Fig. 6A). In addition, RORA expression was clearly decreased with GATA2 overexpression in HBVSMCs and mVSMCs (Fig. 6B). As illustrated in Fig. 6C, the result indicated that GATA2 could facilitate miR-374a expression. It was also observed that high GATA2 expression could augment the proliferation, migration of VSMCs, which could be significantly rescued by miR-374a downregulation (P<0.05; Fig. 6D-F).
ChIP assay was conducted to further explore the direct association of GATA2 with the promoter of miR-374a. Binding sites of GATA2 inside the assumed miR-374a promoter region were predicted according to the JASPAR database. ChIP assays further confirmed that GATA2 binds to the ARE site in promoter miR-374a. As illustrated in Fig. 6G, miR-374a promoter activity was upregulated with the elevation of GATA2 binding to the miR-374a promoter region. Additionally, ChIP assay confirmed the direct binding of GATA2 to the miR-374a promoter (Fig. 6H and I). These results indicated that GATA2 regulated miR-374a expression via binding to its promoter in HBVSMCs and mVSMCs.
Discussion
A number of studies have shown that miRNAs played significant roles in facilitating or suppressing the proliferation and motion of VSMCs. For instance, Li et al (20) suggested that lncRNA TUG1 promoted proliferation of VSMC and atherosclerosis by regulating miRNA-21/PTEN axis. Sun et al (21) indicated that miRNA 146b-5p protected against atherosclerosis by inhibiting VSMC proliferation and migration. Afzal et al (22) demonstrated that NCK associated protein 1 modulated by miRNA-214 determined VSMC migration, proliferation and neointima hyperplasia. Evidence indicates that miR-374a was tightly related to the development of various types of carcinomas. For instance, Son et al (23) reported that miR-374a-5p promoted tumor progression via targeting ARRB1 in triple negative breast cancer. Li et al (24) found that miR-374a activated Wnt/β-catenin signaling to promote osteosarcoma cell migration by targeting WIF-1. Xu et al (25) indicated that miR-374a promoted cell proliferation, migration through targeting SRCIN1 in gastric cancer. However, the effect of miR-374a and its molecular mechanism in AS remains to be elucidated.
The present study confirmed that miR-374a was indeed upregulated in PDGF-bb-induced VSMCs. Also, overexpression of miR-374a via transfection could promote the proliferation and migration of HBVSMCs and mVSMCs, whereas miR-374a inhibitors showed the opposite effect, which demonstrated that high-expression of miR-374a could promote AS development. Moreover, circTADA2A was found to sponge miR-374a and RORA could serve as a direct target of miR-374a on the basis of miRWalk and dual-luciferase assay. Finally, mechanism studies showed that circTADA2A may suppress proliferation and migration of HBVSMCs and mVSMCs via sponging miR-374a, and then upregulating RORA expression. Huang et al (26) reported that melatonin and its nuclear receptor retinoid-related orphan receptor α (RORα) had some protective effects on the progression of atherosclerosis, which was consistent with the present research.
Previous studies reported that TFs were closely associated with AS. For example, Erbilgin et al (27) found that TF ZHX2 deficiency could decrease AS and facilitate macrophage apoptosis in mice. Qin et al (28) discovered that activating TF 3 was a potential target and a new biomarker for the prognosis of AS. Nakagawa et al (29) reported that enterohepatic TF CREB3L3 protected AS by SREBP competitive inhibition. The present study used bioinformatics method to predict TFs regulating promoters of miR-374a and found that GATA2 may serve as a direct upstream regulatory molecule of miR-374a, which was further confirmed based on ChIP assay and luciferase reporter assay.
VSMCs serve as highly specialized contractile cells with a crucial function in maintaining normal vascular structure and blood pressure (30).
AS could induce vascular wall remodeling process, which results in VSMC dedifferentiation or phenotype switching from contractile phenotype to synthetic phenotype (31). The alteration of the markers for contractile phenotype and synthetic phenotype in VSMCs needs to be analyzed in the future.
Apart from inspiring outcomes, limitations still existed in the present study. First, although the role of the GATA2/circTADA2A-miR-374a-RORA axis in the proliferation of VSMCs was clear, the pathway through which this axis functions remains to be elucidated. Second, the present study lacked the support of clinical samples and animal experiments and needs to be further verified.
In spite of the aforementioned limitations, there are still numerous valuable implications in the present study. The findings showed a novel function of miR-374a in promotion of PDGF-bb-induced VSMC proliferation and migration by inhibition of RORA. Moreover, circTADA2A bound to miR-374a and decreased the expression of miR-374a, which resulted in inhibition of cell growth and migration. In addition, the present study verified that GATA2 was a direct upstream regulatory molecule of miR-374a. Thus, it was suggested that GATA2/circTADA2A-miR-374a-RORA axis might be therapeutic targets in VSMCs-associated disease. Further large-scale, well-designed studies should be conducted to confirm these findings before the application of GATA2/circTADA2A-miR-374a-RORA axis for targeted therapy of AS.
Acknowledgements
Not applicable.
Funding
Funding: No funding was received.
Availability of data and materials
The data generated in the present study may be requested from the corresponding author.
Author contributions
WT, YD and MW were the administrators of the present study. WT, MF, MW and YD performed data curation. WT, MF, YD and QZ implemented formal analysis. YW, DG and QZ conducted the investigation. DG and JL were in charge of methodology. WT, MF and YD confirm the authenticity of all the raw data. WT, MF and YD wrote the original daft. YD and MW wrote, reviewed and edited the manuscript. All authors read and approved the final version of the manuscript.
Ethics approval and consent to participate
Not applicable.
Patient consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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