MicroRNA-381 serves as a prognostic factor and inhibits migration and invasion in non-small cell lung cancer by targeting LRH-1

Retraction in: /10.3892/or.2023.8640

  • Authors:
    • Chunyan Tian
    • Jun Li
    • Lili Ren
    • Ren Peng
    • Binbin Chen
    • Yumei Lin
  • View Affiliations

  • Published online on: September 14, 2017     https://doi.org/10.3892/or.2017.5956
  • Pages: 3071-3077
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Abstract

Accumulating evidence has demonstrated that aberrant miRNAs were involved in carcinogenesis and tumor progression by regulating oncogenes or tumor suppressor expression. Dysregulation of miR-381 has been reported in different tumors. However, the clinical roles and underlying mechanism in non-small cell lung cancer (NSCLC) remains to be elucidated. We found the expression of miR-381 was significantly downregulated in both NSCLC tissues and cell lines. Clinical analysis revealed the reduced miR-381 was obviously associated with advanced TNM stage and lymph node metastasis. Moreover, we disclosed that miR-381 was a novel independent prognostic marker for predicting 5-year survival of NSCLC patients. The ectopic overexpression of miR-381 inhibited cell migration and invasion in vitro and in vivo. Notably, miR-381 could modulate LRH-1 by directly binding to its 3'-UTR. In clinical samples of NSCLC, miR-381 inversely correlated with LRH-1 expression, which performed positive roles in NSCLC migration and invasion. Alteration of LRH-1 expression at least partially abolished the migration and invasion of miR-381 on NSCLC cells. Here, we identified LRH-1 as a functional target of miR-381 in NSCLC. In conclusion, our data indicated that miR-381 inhibited migration and invasion of NSCLC by targeting LRH-1, and may represent a novel potential therapeutic target and prognostic marker for NSCLC.

Introduction

Non-small cell lung cancer (NSCLC), which is the predominant pathological type of lung cancer, is one of the most malignant and aggressive cancers and the leading cause of cancer-related death (13). In spite of rapid improvements in therapeutic strategies, including surgical technique, chemotherapy and diagnosis, the 5-year survival rate for NSCLC remains unsatisfactory (4). Because of cigarette smoking and environment pollution (5), the mortality rates for NSCLC are increasing. Therefore, it is urgent to investigate the molecular mechanism related to pathogenesis of NSCLC and develop novel therapeutic biomarkers for NSCLC (6).

MicroRNAs (miRNAs) are a family of endogenous, single-stranded and non-coding small RNAs (approximately 19–22 nucleotides) that function as negative regulator of gene expression at post-transcriptional level via interacting to 3′-untranslated (3′-UTR) regions of target mRNAs through complementary base pairing, causing translational repression or mRNA cleavage (7,8). Mounting evidence demonstrated that aberrant miRNAs are involved in numerous biological processes including cell differentiation, proliferation, angiogenesis, apoptosis and metastasis (9,10). Accumulating studies revealed that miRNAs have the potential to serve as diagnostic or prognostic biomarkers for cancer patients. Recently, miR-381, which belongs a cluster on 14q32.31 region, was reported to play critical role in the cancer carcinogenesis and progression (11,12). In glioma cells, miR-381 promotes proliferation by regulating MEK/ERK and AKT signaling pathways in vitro and in vivo (13). However, miR-381 suppresses cell proliferation and invasion by targeting liver receptor homologue 1 (LRH-1) in colon cancer and hepatocellular carcinoma (14,15). miR-381 inhibits breast cancer cell proliferation, epithelial-to-mesenchymal transition (EMT) and metastasis by targeting CXCR4 (16). In ovarian cancer, miR-381 inhibits cancer proliferation, migration and invasion via targeting YY1 expression (17). In gastric cancer, miR-381 inhibits TGF-β signaling pathway and downregulated EMT phenotype by mediating TMEM16A (18). Low expression of miR-381 is a prognostic factor and enhances the chemo sensitivity of osteosarcoma (19). Moreover, miR-381 inhibits pituitary tumor cell tumorigenesis and are involved in a p53/PTTG1 regulation feedback loop (20). Therefore, the functional role of miR-381 in cancer development and progression was cancer-type dependent. Nevertheless, the clinical significance of miR-381 and the molecular mechanisms in NSCLC remain to be elucidated.

In this study, we investigated the expression and biological function of miR-381 in NSCLC progression. We found that miR-381 was significantly reduced in both NSCLC tissues and cell lines. Its expression level closely correlates with poor prognostic features and worse 5-year survival outcome in patients. miR-381 inhibited NSCLC cell migration and invasion in vitro by gain- and loss-of-function experiments through directly targeting LRH-1. Taken together, these data confirm the underlying mechanism by which miR-381 inhibits migration and invasion of NSCLC and identify miR-381 as a novel prognostic biomarker for NSCLC patients.

Materials and methods

Clinical tissues and cell culture

Clinical tissues were obtained from NSCLC patients who received surgical resection in Department of Oncology from 2002 to 2011. All these clinical tissues from patients have been pathologically diagnosed as NSCLC before performing experiments in this study. The informed consents were obtained from every patient involved in this study. Approval for experiments involving patient samples was obtained from the institutional research ethics committee of China-Japan Union Hospital of Jilin University (JL20010923).

Cell lines including A549, H1299, 95D, SPC-A1, H358 and BEAS-2B were from the Cell Bank of Chinese Academy of Sciences (Shanghai, China) and American Type Culture Collection (ATCC, Rockville, MD, USA). All cells were cultured in DMEM medium (Gibco Co., New York, NY, USA) supplemented with 10% fetal bovine serum (Gibco Co.). Cell cultures were incubated in cell incubators with humidified atmosphere and 5% CO2 at 37°C.

Quantitative real-time reverse transcription-PCR (qRT-PCR)

Rnaeasy mini kit (Qiagen) were used to extract the RNA from NSCLC tissues and cells. Transcriptional First Strand cDNA Synthesis kit (Roche, Indianapolis, IN, USA) and SYBR Green PCR Master Mix (Applied Biosystems, Foster City, CA USA) were used for reverse transcription reactions and real-time PCR. Primers for miR-381, U6, LRH-1 and GAPDH were bought from Genecopoeia (Guangzhou, China). U6 and GAPDH were the internal controls for miR-381 and LRH-1, respectively.

Western blotting

Total protein was extracted in RIPA buffer (Beyotime, Shanghai, China) containing a protease and phosphatase inhibitor (Thermo Fisher Scientific, Rockford, IL, USA), then the protein concentration was determined using BCA Protein assay kit (Thermo Fisher Scientific). Equal protein (30 µg) was loaded and separated by 10% SDS-PAGE and transferred to polyvinylidenediflouride (PVDF) membrane (Millipore, Billerica, MA, USA). The membranes were incubated with respective primary antibodies: LRH-1 and GAPDH (1:1000, Cell Signaling Technology, Inc.) at 4°C overnight after blocking with 5% non-fat milk in TBS. Then the membranes were washed three times by TBST and incubated with appropriate peroxidase-conjugated secondary antibody for 2 h at room temperature (ZSGB-BIO, Beijing, China). Protein bands were visualized by enhanced chemiluminescence kit (Amersham, Little Chalfont, UK).

Immunohistochemical analysis

The tissues were fixed in formalin, embedded with paraffin and sliced into 4-µm sections for immunohistochemical staining. Three sections matched different levels of the lungs were collected and stained with hematoxylin and eosin (H&E). Then the lung metastasis number of cancers were counted.

Cell transfection

miR-381 lentiviral expression or control vector were obtained from the company of GeneCopoeia. LRH-1 overexpression plasmid or control plasmid were purchased from Ruibo (Guangzhou, China). The tranfection of these vectors into NSCLC cells were performed in 6-well plates with Lipofectamine 2000 (Invitrogen, Carlsbad, CA, USA) based on the instruction from manufacturer.

Transwell assays

The migration and invasion ability of NSCLC cells were investigated by Transwell assays without or with matrigels. Generally, NSCLC suspended in basal DMEM were seeded into the upper chamber and the lower chambers contained 600 µl DMEM with 20% FBS. After 24–48 h, NSCLC cells migrated or invaded through the membranes and stayed on the lower surface were stained with crystal violet. Cell number for the migrated or invaded cells was counted under a microscope.

Luciferase reporter assay

Wild-type LRH-1 3′-UTR sequence and the mutated LRH-1 3′-UTR sequence were constructed into the pGL3 control vector (Promega, Madison, WI, USA) to get wt LRH-1-3′-UTR vector and mt LRH-1-3′-UTR vector, respectively. For luciferase reporter assay, NSCLC cells were co-transfected with the wild-type construct or mutant construct, and, miR-381 lentiviral expression or control vector. After 48 h of transfection, cells were harvested and lysed. The Dual-Luciferase Reporter Assay system (Promega, Shanghai, China) were used to the firefly and Renilla luciferase activities.

Statistical analysis

Data are presented as the mean ± SD and performed in at least three independent replicates. SPSS software, 16.0 (SPSS, Inc, Chicago, IL, USA) and Graphpad Prism 6.0 (CA, USA) were used for a two-tailed Student's t-test, Pearson's correlation analysis, Kaplan-Meier method and the log-rank test to evaluate the statistical significance. Differences were defined as P<0.05.

Results

miR-381 was decreased in NSCLC tissues and cell lines

To determine the expression level of miR-381 in NSCLC, we performed qRT-PCR to detect miR-381 expression in 124 paired NSCLC tissues and adjacent non-tumor tissues. The results showed that miR-381 was significantly decreased in NSCLC tissues compared to adjacent non-tumor tissues (P<0.05, Fig. 1A). Besides, miR-381 expression was significantly downregulated in all NSCLC cell lines (A549, H1299, 95D, SPC-A1 and H358) compared with normal lung epithelial cell line BEAS-2B (P<0.05, Fig. 1B). Taken together, these data suggest that reduced miR-381 may be associated with NSCLC carcinogenesis and development.

Clinical significance of downregulated miR-381 in NSCLC

To explore the function of miR-381 in NSCLC, we classified two different miR-381 groups according to median expression level to correlate miR-381 expression with clinicopathological characteristics in NSCLC patients. As shown in Table I, the downregulated miR-381 was significantly associated with advanced TNM stage (P=0.006) and lymph node metastasis (p=0.001). These data indicated that the reduced miR-381 was correlated with poor prognostic characteristics of NSCLC. Moreover, we determined the effects of miR-381 by Kaplan-Meier analysis curve and it showed that the higher miR-381 expression had significantly better overall survival (P=0.0001, Fig. 2). Furthermore, miR-381 was an independent factor for predicting 5-year overall survival in NSCLC patients (P=0.001, P=0.002, respectively, Table II). These data confirmed the potential value of miR-381 as a prognostic biomarker for NSCLC patients.

Table I.

Correlation between clinicopathological features and miR-381 expression in NSCLC tissues (n=124).

Table I.

Correlation between clinicopathological features and miR-381 expression in NSCLC tissues (n=124).

Expression level

Clinical parametersCases (n) miR-381high (n=55)miR-381low (n=69)P-value
Age (years) 0.833
  <60351520
  ≥60 years894049
Sex 0.669
  Male974453
  Female271116
Histology type 0.880
  Squamous783543
  Adenocarcinoma462026
Lymph node metastasis 0.001a
  Negative924943
  Positive32  626
TNM stage 0.006a
  I+II884642
  III+IV36  927

a P<0.05.

Table II

Univariate and multivariate analysis of prognostic factors in NSCLC patients.

Table II

Univariate and multivariate analysis of prognostic factors in NSCLC patients.

Univariate analysisMultivariate analysis


VariablesHR95% CIP-valueHR95% CIP-value
TNM stage2.2581.846–5.2410.007a1.9421.154–3.0280.009a
Lymph node metastasis3.1271.652–6.2570.002a2.3181.664–5.8910.005a
miR-3813.6641.718–7.2490.001a3.1671.453–6.9290.002a

{ label (or @symbol) needed for fn[@id='tfn2-or-38-05-3071'] } HR, hazard ratio; CI, confidence interval

a Statistically significant.

miR-381 suppresses NSCLC cell migration and invasion in vitro and in vivo

To clarify the biological function of miR-381 in NSCLC, we transfected miR-381 lentiviral expression or control vector into A549 (P<0.05, Fig. 3A) and H1299 cells (P<0.05, Fig. 3B) to establish two stable overexpression-miR-381 cell lines. As a result, overexpression of miR-381 inhibited cell migration (P<0.05, Fig. 3C) and invasion (P<0.05, Fig. 3D) as measured by Transwell assays. Besides, to prove the role of miR-381 in lung metastasis, we constructed lung metastasis mouse model by injecting LV-miR-381 or LV-control A549 or H1299 cells into tail vein of nude mice to induce pulmonary metastasis. Subsequently, overexpressing miR-381 significantly reduced the lung metastasis of A549 or H1299 cells (P<0.05, Fig. 3E). These data suggest that miR-381 played a key role in migration and invasion of NSCLC cells in vitro and in vivo.

LRH-1 is a direct downstream target of miR-381

To identify the target and possible mechanism of miR-381, we searched the candidate target genes of miR-381 by analyzing different bioinformatics algorithm (TargetScan and miRanda) and found that the 3′-UTR of LRH-1 contains a putative binding site for miR-381 (Fig. 4A). To validate that LRH-1 was a direct target of miR-381, a luciferase assay was conducted to determine whether miR-381 directly targets LRH-1 3′-UTR. The results showed that overexpression of miR-381 decreased the luciferase activity of the wild-type (wt) LRH-1 3′-UTR, but not mutant (mt) LRH-1 3′-UTR (P<0.05, Fig. 4B). Furthermore, miR-381 overexpression markedly suppressed LRH-1 mRNA (P<0.05, Fig. 4C) and protein (P<0.05, Fig. 4D) expression in A549 and H1299 cells. These results suggest that miR-381 could directly target LRH-1 in NSCLC cells through binding its 3′-UTR.

miR-381 was negatively correlated with LRH-1 expression in NSCLC tissues

To further confirm the above data which suggest LRH-1 was a direct target of miR-381, we performed qRT-PCR to explore the LRH-1 expression in NSCLC tissues. Our data revealed that LRH-1 mRNA and protein levels were significantly lower in high miR-381 group than that in low miR-381 group in NSCLC (P<0.05, Fig. 5A and B). Moreover, the results showed that the mRNA level of LRH-1 in the NSCLC tissues was inversely correlated with miR-381 expression (R2=0.6248, P<0.0001, Fig. 5C). Taken together, these data indicated that LRH-1 was a direct downstream target of miR-381 in NSCLC tissues.

Alterations of LRH-1 expression abrogated the suppressive effects of miR-381

To further confirm LRH-1 was a functional target and was involved in miR-381-mediated biological effects, we restored LRH-1 expression in A549-miR-381 and H1299-miR-381 cells by transfecting LRH-1 expression plasmid (P<0.05, Fig. 6A). Furthermore, Transwell assay showed that LRH-1 overexpression promoted cell migration (P<0.05, Fig. 6B) and invasion (P<0.05, Fig. 6C), which abolished the suppressive effects of miR-381 on A549 and H1299 cells. These data demonstrated that LRH-1 mediates the functional effects of miR-381 on migration and invasion in NSCLC cells.

Discussion

Increasing studies demonstrate that aberrant miRNAs are involved in the initiation, development and progression of cancers through modulating their targeting oncogenes or tumor suppressor genes, which could potentially serve as biomarkers for prediction and prognosis of cancer patients, including NSCLC (21,22). Hence, identification of cancer-specific miRNAs is critical for elucidating their underlying molecular mechanisms and vital for developing novel therapeutic targets. In previous studies, miR-381 regulated proliferation, apoptosis, migration and invasion in metastatic prostate cancer cells (11). Chen et al reported that miR-381 sensitizes renal cancer cells to 5-fluorouracil (5-Fu) by upregulation of Cdc2 activities in 786-O (23). miR-381 inhibits glioma growth and bromodomain containing 7 (BRD7) transcription by directly targeting leucine-rich repeat C4 (LRRC4) (24). Moreover, miR-381 functions as a tumor suppressor in colorectal cancer by targeting Twist 1 (25). In addition, Wang et al demonstrated that targeting miR-381-NEFL axis sensitizes glioblastoma cells to temozolomide by regulating stemness factors and multidrug resistance factors (26). These studies indicated that miR-381 plays a critical role in cancer.

In the present study, we confirmed that miR-381 was significantly downregulated in cancer tissues and cell lines. Our data showed that decreased miR-381 was associated with advanced TNM stage and lymph node metastasis in NSCLC. In addition, miR-381 expression was an independent prognostic indicator for predicting 5-year overall survival of NSCLC patients. Taken together, these data suggest that miR-381 may play a critical role in the development of NSCLC and the reduced miR-381 expression predicts a worse prognosis and could be identified as a prognostic biomarker. Mechanically, ectopic expression of miR-381 inhibited cell migration and invasion capacity of NSCLC A549 and H1299 cells. We confirmed that LRH-1 was a direct target of miR-381 in NSCLC, which was similar with colon cancer and hepatocellular carcinoma. We also observed that miR-381 overexpression suppressed the expression of LRH-1 mRNA and protein. Moreover, we found an inverse correlation between miR-381 expression and LRH-1 in NSCLC tissues. Additionally, alteration of LRH-1 expression abolished the effects of miR-381 on cell migration and invasion. Thus, these results indicated that miR-381 inhibited the migration, invasion by directly blocking LRH-1 pathway.

Liver receptor homolog-1 (LRH-1), which is a nuclear receptor member of nuclear receptor subfamily 5 group A member 2 (NR5A2), is essential for diverse biological progress, including cell proliferation, embryonic development, cholesterol metabolism and cell differentiation (27,28). Recent studies have reported that LRH-1 could be identified as a novel oncogene to contribute to tumor carcinogenesis and development (29). LRH-1 modulates Wnt/β-catenin signaling pathway and glucocorticoid synthesis to inhibit immune cell activation (30). LRH-1 also has been described as a target of miR-376c and mediated cell growth and invasion inhibition by regulating Wnt signaling pathway. These data indicated that LRH-1 exerted as an oncogene in tumor progression. In this study, we demonstrated that LRH-1 was a functional mediator for miR-381 in NSCLC.

In conclusion, we demonstrated that miR-381 was downregulated in NSCLC tissues and cell lines, and its reduced expression was associated with advanced clinicopathological features. Furthermore, we confirmed miR-381 inhibited cell migration and invasion by inhibiting LRH-1. These results suggest that miR-381 is a potential metastasis-associated tumor suppressor in NSCLC. Taken together, the decreased miR-381 may play a critical role in tumor metastasis and may be a novel prognostic factor and potential therapeutic target for NSCLC.

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November-2017
Volume 38 Issue 5

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Tian C, Li J, Ren L, Peng R, Chen B and Lin Y: MicroRNA-381 serves as a prognostic factor and inhibits migration and invasion in non-small cell lung cancer by targeting LRH-1 Retraction in /10.3892/or.2023.8640. Oncol Rep 38: 3071-3077, 2017.
APA
Tian, C., Li, J., Ren, L., Peng, R., Chen, B., & Lin, Y. (2017). MicroRNA-381 serves as a prognostic factor and inhibits migration and invasion in non-small cell lung cancer by targeting LRH-1 Retraction in /10.3892/or.2023.8640. Oncology Reports, 38, 3071-3077. https://doi.org/10.3892/or.2017.5956
MLA
Tian, C., Li, J., Ren, L., Peng, R., Chen, B., Lin, Y."MicroRNA-381 serves as a prognostic factor and inhibits migration and invasion in non-small cell lung cancer by targeting LRH-1 Retraction in /10.3892/or.2023.8640". Oncology Reports 38.5 (2017): 3071-3077.
Chicago
Tian, C., Li, J., Ren, L., Peng, R., Chen, B., Lin, Y."MicroRNA-381 serves as a prognostic factor and inhibits migration and invasion in non-small cell lung cancer by targeting LRH-1 Retraction in /10.3892/or.2023.8640". Oncology Reports 38, no. 5 (2017): 3071-3077. https://doi.org/10.3892/or.2017.5956