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Basic research

LncRNA TP73-AS1 interacted with miR-141-3p to promote the proliferation of non-small cell lung cancer

Xinfa Liu
,
Mingming Wang
,
Yanzhi Cui

Arch Med Sci 2019; 15 (6): 1547–1554
Online publish date: 2019/07/22
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- LncRNA TP73-AS1.pdf  [0.09 MB]
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Introduction

Lung cancer is the leading cause of cancer-related death worldwide. Non-small cell lung cancer (NSCLC) constitutes approximately 80% of all diagnosed lung cancers cases, and the 5-year survival rate of the disease is ~20% [1]. Alt-hough surgical operation still represents the main curative treatment for NSCLC up to stage IIIA disease, the risk of postoperative disease recurrence has been reported to be as high as 52% [2]. Most patients eventually succumb to re-currence of the disease despite the high initial response to therapy. According to the results of several large-sample clini-cal studies on the effect of surgical operation of global NSCLC patients, the five-year survival rate is about 31–42% [3]. Recently, advances in clinical and experimental oncology have been made for treating NSCLC, but its complicated pathology is unclear, and more work is required to identify novel molecules that are involved in the process. Therefore, investigation of the molecular mechanisms underlying NSCLC tumourigenesis may aid in the development of novel therapeutic targets and strategies for the treatment of the malignancy.
Some studies using deep transcriptome sequencing and microarrays have led to the estimation that 70–90% of the human genome is transcribed into non-protein-coding RNA [4–6]. Small non-coding RNAs such as microRNAs have been studied extensively, and their roles in gene regulation and cell function have been elucidated in numerous cancers [7–9]. Long non-coding RNAs (lncRNAs) are non-coding RNAs of more than 200 nucleotides (nt) in length and are characterised by diverse and complex sequences and mechanisms of action. Recent studies indicate that lncRNAs are involved in a variety of biological processes and diseases in humans, including cancers. Thus, lncRNAs have emerged as a new regulator in cancer research, and several studies have shown that some lncRNAs function as onco-genes, tumour suppressor genes, or both, depending on the circumstances [10–13].
Several lncRNAs have been reported to be involved in glioma. HOTAIR, a cell cycle-associated lncRNA, has been revealed to primarily serve as a prognostic factor for glioma patient survival, as well as a biomarker for identify-ing glioma molecular subtypes [14]. LncRNA HULC enhances epithelial-mesenchymal transition to promote tumor-igenesis and metastasis of HCC via the miR-141-3p-3p/ZEB1 signalling pathway. LncRNA BANCR expression was remarkably increased in HCC tissues; BANCR downregulation in Hep3B cells impaired cell proliferation, promoted cell apoptosis, reduced cell invasion and migration, led to downregulated venetian, and unregulated E-cadherin protein lev-els [15–17]. TP73-AS1, a lncRNA transcribed from chromosome1p36, has been reported to be associated with cell pro-liferation and tumour progress. Previous studies predicted that TP73-AS1 might be up-regulated in HCC cells through a bioinformatics database [18–20]. Although emerging evidence has suggested that TP73-AS1 associated with cancer progression and prognosis, the detailed role of TP73-AS1 in NSCLC and the underlying mechanism remains unclear.
Several studies have indicated that some specific lncRNAs can function as miRNA sponges to control miRNAs available for binding with their targets, functionally liberating mRNA transcripts targeted by certain miRNAs [21–25]. Actually, one miRNA may have multiple mRNA targets, so it may be involved in diverse pathological processes. Meanwhile, the 3′-UTR of target mRNA can be recognised by multiple miRNAs, and they can alter cellular responses via a coordinated network. Several miRNAs (miR-133b, miR-34, miR-107, miR-433 and miR-205, miR-141-3p) have been observed to be aberrantly expressed in cancer tissue and are involved in regulation of multiple biological processes such as cell proliferation, apoptosis, migration, and invasion [26–29].
In the current study, we investigate the interaction between TP73-AS1 and miR-141-3p, which can regulate NSCLC cell growth. Our findings provide a novel understanding of the TP73-AS1 and miR-141-3p axis in NSCLC cell proliferation and the molecular mechanism involved in the process of tumorigenesis.

Material and methods

Clinical specimens

Fifty-five paired NSCLC specimens and corresponding adjacent non-tumour tissues were recruited from tumour sur-gical resection in the Fourth Hospital of Hebei Medical University from February 2012 to December 2016. The adja-cent non-tumour tissues were pathologically evaluated and in all cases they were lung tissue. None of these NSCLC patients were treated with radiotherapy, chemotherapy, or immunotherapy prior to operation. After surgery was com-pleted, all of the tissue samples were immediately snap-frozen in liquid nitrogen and then stored at –80°C until use.
The Medical Ethics Committee of the Fourth Hospital of Hebei Medical University approved this study. Written, informed consent conforming to the tenets of the Declaration of Helsinki were obtained from each participant prior to the study.

Cell lines

Human NSCLC cells line such as A459 and SPC-A1 and immortalised normal human bronchial epithelial cell line (16HBE) were purchased from American Type Culture Collection (ATCC, Manassas, VA, USA). A459 and SPC-A1 were cultured in Dulbecco’s modified Eagle’s medium (DMEM) (Gibco Co., USA) including 10% foetal bovine serum (FBS) (Gibco Co., USA), 100 U/ml penicillin, and 100 ug/ml streptomycin. 16HBE cell line was maintained in cell cul-ture medium consisting of 1 : 1 Medium 199 and MCDB105 medium (Sigma-Aldrich) with 10% FBS and 10 ng/ml EGF (Sigma-Aldrich). All cells were cultured at 37°C in a humidified atmosphere of 5% CO2 on 0.1% gelatine-coated culture flasks.

Cell transfection

Both the miRNA mimics, siRNAs, and negative controls were synthesised by Ruibo Company (Guangzhou, China). Oligonucleotide and plasmid transfection were conducted by using Lipofectamine™ 2000 transfection reagent (Invi-trogen, USA) followed by the protocol recommended by the manufacturer. Cells were plated in six-well plates or 96-well plates, transfected, incubated for 48 h, and used for further assays or RNA/protein extraction.

BrdU cell proliferation assay

DNA synthesis in proliferating cells was determined by measuring 5-bromo-2-deoxyuridine (BrdU) incorporation. BrdU assays were performed at 48 h after transfecting A459 and SPC-A1 cells with si-NC or si-TP73-AS1. After seeding the infected cells in 96-well culture plates at a density of 2 × 103 cells/well, they were cultured for 24 h or 48 h, and in-cubated with a final concentration of 10 µM BrdU (BD Pharmingen, San Diego, CA, USA) for 2 h to 24 h. When the incubation period ended, the medium was removed, the cells were fixed for 30 min at RT, incubated with peroxidase-coupled anti-BrdU-antibody (Sigma-Aldrich) for 60 min at RT, washed three times with PBS, incubated with peroxidase substrate (tetramethylbenzidine) for 30 min, and the absorbance values were measured at 450 nm. Background BrdU immunofluorescence was determined in cells not exposed to BrdU but stained with the BrdU antibody.

RNA extraction and Quantitative RT-PCR

Total RNA was extracted with TRIzol reagent (Life Technologies, Carlsbad, CA, USA) according to a previous report. The resulting RNA pellet was dissolved in 20 ml of RNase-free water and then stored at –80°C for subsequent examina-tion. Then the RNA sample reverse transcriptions were synthesised for lncRNA and miRNA expression assays from to-tal RNA of the same sample in a 30 µl volume, including 2 µl total RNA, 2 µl reverse transcription primer (random pri-mers for U6 snRNA and Bulge-LoopTM miRNA, RiboBio, China), 5 µl RT buffer, 0.5 µl PrimeScript™ II Reverse Transcriptase (200 U/µl), 0.5 µl RNase inhibitor (40 U/µl), 2 µl dNTP (2.5 mM), and 18 µl ddH2O. qRT-PCR was done by using qRT-PCR using the 7500HT Fast Real-Time PCR System. Each reaction was carried in a total volume of 20 µl including 1 µl cDNA, 10 µl SYBR Premix Ex TaqÔ II (TaKaRa Biotechnology Co. Ltd., China), 0.5 µl/primer, and 9 µl ddH2O, where the program was set to 95°C in 5 min for pre-incubation, 40 cycles at 95°C in 5 seconds and at 60°C in 20 s for the annealing and amplification, as well as final addition dissociation curve. The following primers were used to detect the expression of TP73-AS1 and GAPDH (internal control): TP73-AS1 F: 5-CCGGTTTTCCAGTTCTTGCAC-3, TP73-AS1 R: 5-GCCTCACAGGGAAACTTCATGC-3, GAPDH F: 5-AGAAGGCTGGGGCTCATTTG-3, and GAPDH R: 5-AGGGGCCATCCACAGTCTTC-3, miR-141-3p RT: GTCGTATCCAGTGCAGGGTCCGAGGTATTCGCACTG-GATACGACTCCAAC, F: GGCGCATCTTCCAGTACAGT, U6 F: CTCGCTTCGGCAGCACA R: AACGCTTCAC-GAATTTGCGT. The relative expression level of miRNAs was normalised to U6 small nucleolar RNA. All qRT-PCR runs were repeated in three replications. The results were calculated with the 2–Ct method.

Dual luciferase reporter assay

HEK293 cells were seeded into a 24-well plate. Wild-type and mutated TP73-AS1 (wt-TP73-AS1 and mut-TP73-AS1 containing an 8 bp mutation in the predicted binding sites of miR-141) luciferase reporter gene vectors were constructed based on the guidelines of the QuikChange Lighting Site-Directed Mutagenesis Kit (Stratagene, La Jolla, CA, USA). miRNA mimics and their negative control (NC) were synthesised by Guangzhou Rui Bo Biological Technology Co. Ltd., China. For the luciferase reporter detection, HEK293T cells were planted in RPMI media containing 10% foetal bovine serum at 5 × 104 cells per well in 24-well plates. After 24 h, these cells were co-transfected with 50 ng psiCHECK2-3’UTR wild-type or mutant reporter plasmids. In the meantime, these wells of cell culture were added by 100 nM of miRNAs mimic or miR-NC by using Lipofectamine 2000 transfection reagent (Invitrogen, Carlsbad, CA, USA). The activities of firefly and Renilla luciferases were assessed after 48 h by using Dual-Glo® Luciferase Assay System (Promega, Cat. E2920, USA), based on the manufacturer’s protocols. Each treatment was performed in triplicate in three independent experiments.

Statistical analysis

The results are shown as the mean ± SEM. The Welch’s corrected unpaired T test and the Kruskal-Wallis test were used to compare continuous variables. The 2 test and Fisher’s exact test were used to compare categorical variables. The relative expression of miR-141-3p was calculated using the 2–Ct method, whereby the average cycle threshold (Ct) values of miR-141-3p were subtracted from the Ct values of U6. P-values less than 0.05 were considered statisti-cally significant. All statistical analyses were performed using SPSS (Statistical Package for the Social Sciences) soft-ware (version 18.0; SPSS Inc.).

Results

The level of TP73-AS1 was increased in NSCLC tissues and cell lines

Initially the expression levels of TP73-AS1 in 55 paired samples (NSCLC specimens and corresponding adjacent non-tumour tissues) were examined using real-time PCR. Results indicated that TP73-AS1 expression was significantly unregulated in tumour tissues compared that of paired normal tissues (Figure 1 A). Then TP73-AS1 expressions in two human NSCLC cell lines A459 and SPC-A1 and immortalised normal human bronchial epithelial cell line (16HBE) as control were determined using real-time PCR. Results suggested that the levels of TP73-AS1 expression were also at higher levels in A459 and SPC-A1 cell lines, compared to the control group (Figure 1 B). These data provide potential evidence that TP73-AS1 was more expressed in NSCLC tissues and cell lines and may be related to poorer prognosis; however, the detailed mechanism underlying the action of TP73-AS1 on NSCLC remains unclear.

TP73-AS1 knockdown suppressed NSCLC cell proliferation

Higher lncRNA TP73-AS1 levels in both NSCLC tissues and cell lines as compared to non-cancer controls suggested that lncRNA TP73-AS1 might play a key role in NSCLC tumourigenesis. To investigate the detailed functions of TP73-AS1 in NSCLC, we generated a series of functional assays. We designed lncRNATP73-AS1 siRNA1, which we trans-fected into A459 and SPC-A1 cells to achieve TP73-AS1 knockdown, as verified using real-time PCR assays (Figure 2 A). After TP73-AS1 was knocked down, the cell proliferation was monitored with use of BrdU. As shown in Figure 2 B, the proliferation of A459 and SPC-A1 cells was significantly down-regulated by TP73-AS1 knockdown compared to the si-NC (negative control) group.

LncRNA TP73-AS1 interacted with miR-141-3p

Recently, it has been reported that lncRNAs can act as miRNA sponges, reducing their regulatory effect on mRNAs. This function introduces an extra layer of layer of complexity in the miRNA-target interaction network. Dysfunction of non-coding RNAs, mainly lncRNAs and miRNAs, can affect processes, including cancer cell proliferation, apoptosis, invasion, and the metastatic process in cancer’s complexity in the miRNA-target interaction network. Among well-established miRNAs in cancers, miR-141 plays an essential role in the regulation of cancer cell proliferation. Further-more, we employed luciferase assays to confirm the miR-141 regulation of TP73-AS1. A wild-type and mutated TP73-AS1 (wt-TP73-AS1and mut-TP73-AS1 containing an 8 bp mutation in the predicted binding sites of miR-142) lucifer-ase reporter gene vector was constructed (Figure 3 A). These indicated vectors were co-transfected into HEK293 cells with miR-142 mimics or miR-142 NC; the luciferase activity was then monitored. Results showed that the luciferase activity of wt-TP73-AS1 vector could be significantly suppressed by miR-141 mimics; after mutation in the predicted binding sites of miR-141 in TP73-AS1, the effect of miR-141 mimics or miR-141 NC on luciferase activity was abol-ished (Figure 3 B), indicating that TP73-AS1 could directly bind to miR-141. We revealed that TP73-AS1 might act as a competing endogenous RNA (ceRNA) to promote NSCLC cell proliferation by sponging miR-141. Finally, we evalu-ated the expression levels of TP73-AS1 and miR-142 in tumour tissues. As exhibited by real-time PCR assays, miR-141 expression was significantly down-regulated in NSCLC tissues (Figure 3 C).

Discussion

Studies have demonstrated that among ncRNAs, ~18% of lncRNAs are associated with human tumours, compared with only 9% of human protein-coding genes, suggesting that lncRNAs could act as major contributors to carcinogene-sis and cancer progression [30, 31]. Many ncRNAs show abnormal expression patterns in cancerous tissues. These in-clude miRNAs, long mRNA-like ncRNAs, GAS5, SNORD50, telomerase RNA, and Y RNAs [32–35]. The miRNAs are involved in the large-scale regulation of many protein coding genes; the Y RNAs are important for the initiation of DNA replication, telomerase RNA that serves as a primer for telomerase, an RNP that extends telomeric regions at chromo-some ends (see Telomeres and disease for more information). The direct function of the long mRNA-like ncRNAs is less clear.
LncRNA TP73-AS1 is located on human chromosomal band 1p36.32. TP73-AS1 is the antisense of the coding gene TP73, which encodes a product that shares structural and functional characteristics with TP53. Global genomic analysis has shown that up to 70% of protein-coding transcripts have antisense partners, and the perturbation of the antisense RNA alters the expression of the sense gene. TP73-AS1 covers substantial portions of TP73, suggesting that TP73-AS1 may function by posttranscriptional regulation of TP73 gene expression. LncRNA TP73-AS1 has been re-ported to be upregulated in oesophageal squamous cell carcinoma [18–20]. LncRNA TP73-AS1 knockdown inhibited BDH2 expression in EC9706 and KYSE30 cells, whereas BDH2 knockdown repressed oesophageal cancer cell prolif-eration and induced apoptosis via the caspase-3-dependent apoptotic pathway [19]. To the best of our knowledge, information on lncRNA TP73-AS1 in NSCLC is still limited.
In the current study, we initially monitored TP73-AS1 expression in a large panel of 55 paired NSCLC tissues and adjacent normal tissues. A significantly higher expression level of TP73-AS1 in NSCLC tissues was observed com-pared to the adjacent normal tissues. Consistently, the expression level of TP73-AS1 was obviously higher in NSCLC cell lines compared to that of the normal cell lines. Then, we designed lncRNA TP73-AS1 siRNA to block TP73-AS1 expression, and thus attenuate proliferation of NSCLC. We found that lncRNA TP73-AS1 siRNA inhibits NSCLC cell proliferation. These results are in agreement with the findings of Yang, et al., who reported that lnRNA TP73-AS1 is significantly downregulated in NSCLC as compared to normal lung tissues (p < 0.001), but it is strongly unregulated in large-cell carcinoma specimens compared to adenocarcinoma, small-cell lung cancer, and squamous cell carcinoma tissues [36]. These findings indicate that lnRNA TP73-AS1 may play an important role in the development and progres-sion of various tumours.
In recent years, it has been proven that in a variety of cell processes, lncRNAs played a vital role by acting as ceRNAs to mediate the miRNAs. Hamada et al. demonstrated that a deregulated triplet, composed of mRNA (RFX1), lncRNA (TP73-AS1), and miRNA (miR-197), contributed to the development and progression of glioblastoma multi-forme [37]. These studies suggest that this lncRNA-microRNA interaction plays an important role in cancer progression through regulation of cancer growth and metastasis. In the present study, we investigated the interaction between TP73-AS1 and miR-141-3p for the first time: TP73-AS1 and miR-141-3p could dually regulate each other in a negatiThe miR-141-3p is believed to play an essential role in tumour suppression by inhibiting epithelial-mesenchymal transition (EMT), the initiating step of metastasis (Korpal). EMT occurs as part of embryonic development and shares many similarities with cancer progression [38–40]. During EMT, cells lose adhesion and increase in motility. This is character-ised by repression of E-cadherin expression, which also occurs during the initial stages of metastasis [41–43]. By contrast, miR-141-3p has been shown to promote the last step of metastasis in which migrating cancer cells undergo MET during their colonisa-tion at distant tissues. In a series of mouse mammary isogenic cancer cell lines, the miR-141-3p family is highly ex-pressed only in the cells that are able to form metastases (4T1 cells) but not in other cells that are unable to colonise (4TO7 cells). Overexpression of miR-141-3pc in non-metastatic 4TO7 cells readily enables MET and colonisation of the liver and lung. miR-14-3p targets the E-cadherin transcriptional repressors ZEB1 and ZEB2. Knockdown of miR-141-3p and miR-200b has been shown to reduce E-cadherin expression thus increasing cell motility and inducing EMT [44–47].
In conclusion, the TP73-AS1/miR-142 axis may play a key role in NSCLC cell proliferation and may provide a therapeutic application in NSCLC patients.

Conflict of interest

The authors declare no conflict of interest.

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Xinfa Liu and Mingwing Wang equally contributed and should be considered as co-first authors.
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