Knockdown of lncRNA ANRIL suppresses the production of inflammatory cytokines and mucin 5AC in nasal epithelial cells via the miR-15a-5p/JAK2 axis
- Authors:
- Published online on: December 15, 2020 https://doi.org/10.3892/mmr.2020.11784
- Article Number: 145
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Copyright: © Liu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
Abstract
Introduction
The incidence of allergic rhinitis (AR) has been increasing over the past decades in Asian countries (1). In China, the frequency of AR has increased from 11 to 17% in the past 10 years (2). AR is an immune-related disease that is characterized as an IgE-modulated type I hypersensitivity disorder (3). However, type 2 helper T (Th2) cells have also been proposed to mediate nasal allergic diseases (4). In addition, IL-13, which is a cytokine produced by Th2 cells, was verified to a key regulator of the pathogenesis caused by immune-related inflammation (5). IL-13 can activate eosinophils and promote the production of mucus and growth factors via the regulation of epithelial cells (6). IL-13-treated human nasal epithelial cells (HNECs) are frequently used as an in vitro model for the study of AR (7). Thus, the modulation of IL-13 is of great significance for the treatment of AR.
Long non-coding RNAs (lncRNAs) are transcripts of ~200-10,0000 nucleotides in length that are not translated into proteins (8,9). lncRNAs have been confirmed to serve important biological roles in numerous biological processes, including DNA damage, programmed cell death and inflammation (10–12). Furthermore, lncRNAs have also been reported to participate in the pathogenesis of AR (13–15). For example, antisense non-coding RNA in the INK4 locus (ANRIL) was found to be associated with an increased AR risk and severity, in addition to an enhanced inflammatory status (16). However, the mechanism by which ANRIL mediates the progression of AR remains to be determined.
MicroRNAs (miRNAs/miRs) are a class of non-coding small RNAs that bind to the 3′-untranslated region (3′-UTR) of mRNA to regulate mRNA expression (17–19). miRNAs have been proven to be involved in various cellular processes, including cell growth, differentiation and metabolic progression (20–24). The dysregulation of miRNAs has also been confirmed in AR, suggesting the potential function of miRNAs in AR (25,26). For instance, miR-498 was discovered to be activated in tissues from patients with AR, and the suppression of miR-498 promoted inflammatory responses caused by IL-13 and mucin production in HNECs (15). Moreover, the expression levels of miR-487b were reported to be upregulated in patients with AR, which mitigated the pathological alterations of AR by inhibiting the expression levels of IL-33 and homolog of sulfotransferase (27). In addition, miR-15a-5p expression levels were reportedly downregulated in patients with AR, where served an inhibitory effect in AR (28). However, the association between ANRIL and miR-15a-5p in AR remains unclear.
JAK2/STAT3 signaling was found to function as a crucial mediator in the overactivation of macrophages, which caused an increase in proinflammatory cytokine production (29). In addition, it was reported that miR-375 alleviated the progression of AR via regulation of the JAK2/STAT3 axis (30). Based on these findings, it was hypothesized that JAK2/STAT3 signaling may serve an important role in the progression of AR.
The present study aimed to confirm the role of ANRIL in AR. In addition, the study aimed to further determine the mechanism by which ANRIL mediated the progression of AR. The results of the current study may provide a novel strategy for the treatment of AR.
Materials and methods
Cell culture and treatment
Primary HNECs (cat. no. HUM-iCell-m018) and 293T cell lines (cat. no. ACS-4500) were purchased from iCell Bioscience, Inc., and the American Type Culture Collection, respectively. All cells were cultured in RPMI-1640 medium (Gibco; Thermo Fisher Scientific, Inc.) supplemented with 10% FBS (Gibco; Thermo Fischer Scientific, Inc.), 1% penicillin (Invitrogen; Thermo Fisher Scientific, Inc.) and 1% streptomycin (Invitrogen; Thermo Fischer Scientific, Inc.), and maintained at 37°C and 5% CO2. To establish an in vitro model of AR, HNECs were treated with 50 ng/ml IL-13 (Sigma-Aldrich; Merck KGaA) at 37°C for 24 h, as previously described (31). The control group consisted of untreated cells.
Cell transfection
Cell transfection was performed according to a previously reported experimental method (32). The miR-15a-5p inhibitor, miR-15a-5p mimic and their respective negative controls (NCs) were purchased from Shanghai GenePharma Co., Ltd. The sequences were as follows: miR-15a-5p mimics sense, 5′-UAGCAGCACAUAAUGGUUUGUG-3′ and antisense, 5′-CAAACCAUUAUGUGCUGCUAUU-3′; mimic NC sense, 5′-UUCUCCGAACGUGUCACGUTT-3′ and antisense, 5′-ACGUGACACGUUCGGAGAATT-3′; miR-15a-5p inhibitor, 5′-CACAAACCAUUAUGUGCUGCUA-3′; and inhibitor NC, 5′- CAGUACUUUUGUGUAGUACAA-3′. For the genetic knockdown of ANRIL, the corresponding short hairpin RNA (shRNA/sh) targeting ANRIL (sh-ANRIL) and the non-targeting control shRNA (sh-NC) were cloned into the pSicoR vector (Addgene, Inc.). pcDNA3.1-JAK2 and the corresponding control (empty pcDNA3.1 vector) were obtained from GenScript. HNECs (5×103 per well) were transfected using Lipofectamine® 2000 reagent (Invitrogen; Thermo Fisher Scientific, Inc.). Briefly, the cells were cultured in antibiotic-free medium (RPMI-1640) at 37°C for 24 h, and transfections were performed upon the cell confluence reaching 90%. The successfully constructed vectors, miR-15a-5p inhibitor/mimics or controls, and Lipofectamine 2000 were diluted (1:100) in serum-free Opti-MEM medium (Gibco; Thermo Fisher Scientific, Inc.), mixed after standing for 5 min, and then incubated for 20 min at room temperature. Then, 100 µl of the mixed solution was added to the cells in each well and incubated at 37°C for 48 h. The medium was replaced with fresh medium after 6 h. Reverse transcription-quantitative PCR (RT-qPCR) was used to confirm the transfection efficiency 48 h after transfection.
RT-qPCR
RT-qPCR analysis was used to analyze mRNA expression levels, as previously described (33). Briefly, total RNA was extracted from HNECs using TRIzol® reagent (Invitrogen; Thermo Fisher Scientific, Inc.), according to the manufacturer's protocol. The quality and quantity of RNA was detected using 10% agarose gel electrophoresis. In addition, A260/A280 ratios were calculated using a spectrophotometer (NanoDrop Technologies; Thermo Fisher Scientific, Inc.), and a ratio between 1.8 and 2.0 indicated that the extracted RNA was qualified. Total RNA was reverse transcribed into cDNA using the PrimeScript RT reagent kit (Takara Bio, Inc.), according to the manufacturer's protocol. qPCR was subsequently performed using the SYBR Premix Ex Taq II kit (Takara Bio, Inc.). The following thermocycling conditions were used for the qPCR: Initial denaturation for 1 min at 95°C; followed by 35 cycles for 15 sec at 95°C and 30 sec at 60°C. The primer pairs used are presented in Table I. The expression levels were quantified using the 2−∆∆Cq method (34). GAPDH or U6 were used as the internal loading control for quantification. Each experiment was performed in triplicate.
Western blotting
Protein expression levels were analyzed using western blotting, according to a previous study (35). Briefly, total protein was extracted from HNECs using RIPA lysis buffer [50 mM Tris (pH 7.4), 150 mM NaCl, 1% Triton X-100, 1% sodium deoxycholate, 0.1% SDS, 2 mM sodium pyrophosphate, 25 mM β-glycerophosphate, 1 mM EDTA, 1 mM Na3VO4 and 0.5 µg/ml leupeptin] (Beyotime Institute of Biotechnology). Total protein was quantified using a bicinchoninic acid protein kit (Pierce; Thermo Fisher Scientific, Inc.) on a Multiskan™ FC microplate photometer (562 nm; Thermo Fisher Scientific, Inc.) and 40 µg protein/lane was separated via 10% SDS-PAGE. The separated proteins were subsequently transferred onto PVDF membranes (Invitrogen; Thermo Fisher Scientific, Inc.) and blocked with 5% skimmed milk in TBS with 10% Tween 20 for 1 h at room temperature. The membranes were then incubated with the following primary antibodies overnight at 4°C (all from Abcam): Anti-JAK2 (1:1,000; cat. no. ab108596), anti-STAT3 (1:2,000; cat. no. ab68153), anti-phosphorylated (p)-STAT3 (1:2,000; cat. no. ab76315) and anti-GAPDH (1:1,000; cat. no. ab9485). Following the primary antibody incubation, the PVDF membranes were washed with TBS with Tween-20 and incubated with a HRP-conjugated secondary antibody (1:5,000; cat. no. ab205718; Abcam) at room temperature for 1 h. Finally, the protein bands were visualized using an ECL detection kit (Beyotime Institute of Biotechnology). The relative protein expression levels were normalized to GAPDH expression levels. Image-Pro Plus 6.0 (National Institutes of Health) was used for the densitometry analysis.
Dual luciferase reporter assay
miR-15a-5p binding sites were identified by StarBase database (http://starbase.sysu.edu.cn). The dual luciferase reporter assay was performed according to a previous study (36). ANRIL and JAK2 3′-UTRs containing the putative binding sites (GCUGCU) of miR-15a-5p were synthetized and obtained from Sangon Biotech Co., Ltd. The aforementioned sequences were cloned into the pmirGLO vector (Promega Corporation) to construct wild-type (WT) or mutant (MUT) ANRIL (10 nM) and JAK2 reporter vectors (10 nM). Point mutations of the miR-15a-5p binding sites were generated using a Site-Directed Mutagenesis kit (Promega Corporation). The WT or MUT ANRIL/JAK2 vectors (10 nM) were co-transfected into HNECs (5×106 per well) with mimics NC or miR-15a-5p mimics (10 nM) using Lipofectamine 2000 reagent for 24 h at 37°C, according to the manufacturer's instructions. After 24 h, relative luciferase activities were detected using a Dual-GLO Luciferase assay system (Promega Corporation). Firefly luciferase activity was normalized to Renilla luciferase activity.
ELISA
The secretory levels of eotaxin-1 [cat. no. 70-EK1130-96; Hangzhou Multi Sciences (Lianke) Biotech Co., Ltd.), granulocyte-macrophage colony-stimulating factor [(GM-CSF); cat. no. 70-EK163HS-96; Hangzhou Multi Sciences (Lianke) Biotech Co., Ltd.] and mucin 5AC [(MUC5AC); cat. no. ml-1016017; Shanghai Enzyme-linked Biotechnology Co., Ltd.] in the supernatant of HNECs were analyzed using ELISA kits. The supernatants of HNECs were harvested by centrifugation (100 × g, 20 min, 4°C). Subsequently, the cells were incubated with a HRP-conjugated secondary antibody, which was included in the ELISA kits, at room temperature for 1 h. Finally, after incubation with hydrochloric acid (100 µl) at room temperature until the solution became discolored, the absorbance was measured using a microplate reader (450 nm).
Statistical analysis
Statistical analysis was performed using SPSS 22.0 software (IBM Corp.). Data are presented as the mean ± SD and three technical repeats were performed in three biological replicate experiments. Statistical differences between 2 groups were analyzed using an unpaired Student's t-test, while ≥3 groups were analyzed using a one-way ANOVA followed by a Tukey's post hoc test. P<0.05 was considered to indicate a statistically significant difference.
Results
ANRIL and JAK2 expression levels are upregulated in IL-13-induced HNECs, while miR-15a-5p expression levels are downregulated
To establish an in vitro model of AR, HNECs were treated with IL-13 for 24 h. As indicated in Fig. 1A, the secretory levels of eotaxin-1, GM-CSF and MUC5AC in HENC supernatants were significantly upregulated by IL-13 stimulation. These data suggested that an in vitro model of AR was successfully established. In addition, the mRNA expression levels of ANRIL and JAK2 in HNECs were significantly upregulated in the presence of IL-13 compared with the control group (Fig. 1B). In contrast, miR-15a-5p expression levels in HNECs were significantly downregulated following IL-13 stimulation compared with the control group (Fig. 1B). Furthermore, the protein expression levels of JAK2 and p-STAT3/STAT3 in HNECs were significantly upregulated by IL-13 stimulation compared with the control group (Fig. 1C and D). These data indicated that ANRIL and JAK2 may promote the occurrence of AR, while miR-15a-5p exhibited the opposite effects.
ANRIL sponges miR-15a-5p in HNECs
To confirm the transfection efficiency of sh-ANRIL in HNECs, RT-qPCR analysis was performed. As shown in Fig. 2A, the expression levels of ANRIL in HNECs were significantly downregulated following transfection with sh-ANRIL. These results confirmed that sh-ANRIL was stably transfected into HNECs. The genetic silencing of ANRIL significantly upregulated the expression levels of miR-15a-5p in HNECs (Fig. 2B). These data suggested that ANRIL may negatively regulate miR-15a-5p expression levels. The expression levels of miR-15a-5p in HNECs were significantly upregulated following the transfection with the miR-15a-5p mimics and downregulated in the presence of the miR-15a-5p inhibitor compared with their respective NC groups (Fig. 2C). Furthermore, to identify the downstream target gene of ANRIL, the StarBase database and dual luciferase reporter assays were used. The StarBase database predicted that ANRIL bound to miR-15a-5p (Fig. 2D). Subsequent dual luciferase reporter assays revealed that the co-transfection with miR-15a-5p mimics significantly suppressed the relative luciferase activity of ANRIL-WT compared with cells co-transfected with the ANRIL-WT vector and mimics NC, while no significant differences were observed in the relative luciferase activity of ANRIL-MUT between the cells co-transfected with the mimics NC or miR-15a-5p mimics (Fig. 2D). These findings suggested that ANRIL may bind to miR-15a-5p in HNECs.
ANRIL regulates the production of inflammatory cytokines and mucin via inhibition of miR-15a-5p
Since eotaxin-1, GM-CSF and MUC5AC have been discovered to serve promoting roles in AR (15,37), the effect of ANRIL on these cytokines and mucin was investigated. As shown in Fig. 3A-C, the mRNA expression levels of GM-CSF, eotaxin-1 and MUC5AC in HNECs were significantly upregulated by IL-13 stimulation; however, the expression levels of the aforementioned genes were significantly reversed in the presence of sh-ANRIL. Conversely, co-transfection with the miR-15a-5p inhibitor partially reversed the effect of ANRIL knockdown on the mRNA expression levels of these cytokines and mucin. Similar results were obtained regarding the secretory levels of eotaxin-1, GM-CSF and MUC5AC using ELISAs; the IL-13-induced increase in eotaxin-1, GM-CSF and MUC5AC concentrations in HNECs were significantly inhibited by silencing ANRIL, while the inhibitory effect of ANRIL silencing was partially rescued following the co-transfection with the miR-15a-5p inhibitor (Fig. 3D-F). Altogether, these results suggested that the miR-15a-5p inhibitor may significantly reduce the anti-inflammatory effect of ANRIL knockdown on IL-13-induced AR in vitro.
miR-15a-5p inactivates JAK2/STAT3 signaling by directly targeting JAK2
To determine the direct target of miR-15a-5p, the StarBase database and dual luciferase reporter assays were used. The analysis indicated that JAK2 might be a direct target of miR-15a-5p (Fig. 4A). Furthermore, the co-transfection with the miR-15a-5p mimics significantly decreased the relative luciferase activity of the JAK2-WT vector compared with the co-transfection with the mimics NC, but no significant differences were observed in the relative luciferase activity of the JAK2-MUT between the mimics NC and miR-15a-5p mimics group (Fig. 4A). Moreover, the expression levels of JAK2 in HNECs were significantly downregulated following the transfection with the miR-15a-5p mimics compared with the mimics NC group (Fig. 4B). In contrast, the miR-15a-5p inhibitor exhibited the opposite effect (Fig. 4B). The protein expression levels of JAK2 and p-STAT3/STAT3 in HNECs were also significantly downregulated in the miR-15a-5p mimics group compared with the mimics NC group, while the expression levels were significantly upregulated by the miR-15a-5p inhibitor compared with the inhibitor NC (Fig. 4C). Meanwhile, to investigate the association between miR-15a-5p and JAK2, HNECs were treated with pcDNA3.1-JAK2 overexpression vector. The data confirmed that the mRNA and protein expression levels of JAK2 were significantly upregulated in HNECs transfected with pcDNA3.1-JAK2 (Fig. 4D and E). These findings suggested that miR-15a-5p may directly target JAK2 to inhibit the STAT3 signaling pathway.
miR-15a-5p mimics significantly reverse IL-13-induced inflammatory responses in HNECs by targeting JAK2
To further confirm the mechanism by which miR-15a-5p mediated the development of AR in vitro, RT-qPCR was used. As expected, the overexpression of miR-15a-5p significantly downregulated the mRNA expression levels of eotaxin-1, GM-CSF and MUC5AC in IL-13-treated HNECs (Fig. 5A-C). In contrast, the inhibitory effect of miR-15a-5p mimics was significantly reversed following JAK2 overexpression (Fig. 5A-C). Similarly, the anti-inflammatory effect of miR-15a-5p on the secretory levels of these proteins was significantly reversed by JAK2 overexpression (Fig. 5D-F). All these data indicated that the upregulation of JAK2 may rescue the anti-inflammatory effect of miR-15a-5p mimics on AR.
Discussion
Although increasing efforts have been made to improve the treatment of AR, the disease remains difficult to manage and significantly affects the patients' quality of life (38). Hence, it is necessary to discover novel methods for AR treatment. In the present study, HNECs were treated with IL-13 to study AR in vitro. The results revealed that the production of GM-CSF, eotaxin-1 and MUC5AC was significantly increased following IL-13 treatment, confirming that the in vitro model of AR had been successfully established. GM-CSF, eotaxin-1 and MUC5AC are known as key mediators in AR due to the fact that upregulation of these three cytokines is associated with the progression of AR (15,32). Thus, the present findings suggested that ANRIL could mediate the progression of AR via regulation of GM-CSF, eotaxin-1 and MUC5AC.
Previous studies have revealed that lncRNAs participate in AR. For example, lncRNA growth arrest specific 5 was found to inhibit the progression of AR via regulation of immune responses (14). Another previous study indicated that linc00632 suppressed the inflammatory cytokine effects caused by IL-13 and mucin production in neuroepithelial cells (15). In the current study, ANRIL was found to be activated in IL-13-treated HNECs. This discrepancy may result from the different functions of lncRNAs on IL-13-induced inflammatory responses. Qian et al (16) reported that ANRIL promoted AR via the regulation of inflammatory cytokines (TNF-α, IL-4, IL-6, IL-13, IL-10 and IL-17). The data of the present study were consistent with this previous finding, verifying that ANRIL knockdown could inhibit the occurrence of AR in vitro by downregulating the production of inflammatory cytokines and mucus. Of note, Zhou et al (39) discovered that silencing ANRIL could sponge miR-125a-5p to inhibit the progression of Alzheimer's disease. However, the findings of the present study revealed that ANRIL could bind to miR-15a-5p in AR. Therefore, ANRIL may play a role in different types of diseases by regulating different miRNAs.
miRNAs are common negative regulators of gene expression. According to the competitive endogenous RNA (ceRNA) mechanism, endogenous lncRNAs with miRNA target sites have the potential to act as natural miRNA sponges, which suppress the expression of miRNA targets by competitively binding and inhibiting miRNAs (40). Notably, some lncRNAs (PVT1 and FENDRR) have been identified to regulate miR-15a-5p expression via the ceRNA network (41,42). The current data identified potential crosstalk between ANRIL and miR-15a-5p, suggesting that ANRIL knockdown inhibited the progression of AR by preventing the sponging of miR-15a-5p. Additionally, it has been previously reported that miR-15a-5p could promote the progression of sepsis by regulating the inflammatory response in macrophages and targeting TNFAIP3-interacting protein 2 (43). In the present research, the overexpression of miR-15a-5p could inhibit the development of AR in vitro by suppressing the secretion of GM-CSF, eotaxin-1 and MUC5AC. Thus, these findings indicated that miR-15a-5p may serve as a suppressor during inflammation. Wang et al (28) reported that miR-15a-5p inhibited IL-13-induced expression of GM-CSF, eotaxin-1 and MUC5AC in HNECs to alleviate AR via negatively regulating adrenoceptor β2 (ADRB2). The findings of the current study were consistent with this previous study, indicating that miR-15a-5p may serve as a suppressor in AR.
In addition, JAK2 was discovered to be directly targeted by miR-15a-5p. JAK2/STAT3 is an important signaling pathway involved in multiple inflammatory responses (44,45). For example, JAK2/STAT3 was reported to promote the inflammatory responses induced by lipopolysaccharide in human umbilical vein endothelial cells (46). Moreover, JAK2/STAT3 has been proven to be a key mediator of Th2-mediated immune responses (47). Paroxetine was identified to exert its immunosuppressive effects on immune responses by activating the JAK2/STAT3 signaling pathway (48), suggesting that the JAK2/STAT3 signaling pathway has immunosuppressive effect, which is the opposite function found in other previous studies. This phenomenon may due to the different type of diseases. In the present study, the overexpression of JAK2 significantly suppressed the anti-inflammatory effects of miR-15a-5p in AR. Wang et al (30) reported that miR-375 could ameliorate AR via the downregulation of the JAK2/STAT3 signaling pathway. Accordingly, the present findings suggested that miR-15a-5p may exert its anti-inflammatory effect in IL-13-treated HNECs by targeting JAK2 and inactivating JAK2/STAT3 signaling. However, it should be noted that this study only focused on JAK2/STAT3 signaling. Since IL-4 secreted by Th2 cells has also been reported to be involved in AR (15), the effect of ANRIL on IL-4 production should be further investigated in the future.
In conclusion, the findings of the present study suggested that ANRIL may function as a mediator in AR. ANRIL knockdown was demonstrated to exert its anti-inflammatory effect in IL-13-treated HNECs via regulation of the miR-15a-5p/JAK2/STAT3 axis. These results suggested that ANRIL may serve as a novel target for the treatment of AR.
Acknowledgements
Not applicable.
Funding
This work is supported by the Regional Fund of National Natural Science Foundation of China (grant no. 81860147).
Availability of data and materials
All data generated or analyzed during this study are included in this published article.
Authors' contributions
H-WL designed the study, performed the experiments, prepared the manuscript and acted as the guarantor of the integrity of the entire study. Y-QZ designed the study, analyzed the data and reviewed the manuscript. Z-LH analyzed the data and reviewed the manuscript. HL, Q-FT and JT performed the experiments. All authors read and approved the final manuscript.
Ethics approval and consent to participate
Not applicable.
Patient consent for publication
Not applicable.
Competing interests
These authors declare that they have no competing interests.
Glossary
Abbreviations
Abbreviations:
|
AR |
allergic rhinitis |
|
HNECs |
human nasal epithelial cells |
|
Th2 |
type 2 helper T cells |
|
ANRIL |
antisense noncoding RNA in the INK4 locus |
|
GM-CSF |
granulocyte-macrophage colony-stimulating factor |
|
MUC5AC |
mucin 5AC |
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