MicroRNA-145 inhibits migration and invasion via inhibition of fascin 1 protein expression in non-small-cell lung cancer cells

Retraction in: /10.3892/mmr.2021.12365

  • Authors:
    • Yingying Zhang
    • Xucheng Yang
    • Haijun Wu
    • Weibin Zhou
    • Zhenzhen Liu
  • View Affiliations

  • Published online on: July 31, 2015     https://doi.org/10.3892/mmr.2015.4163
  • Pages: 6193-6198
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Abstract

MicroRNA (miR)-145 has been shown to act as a suppressor in numerous cancer types, including non-small-cell lung cancer (NSCLC). Fascin 1 (FSCN1), an actin bundling protein, has been implicated in NSCLC. However, the detailed role of miR-145 as well as the association between miR-145 and FSCN1 in the regulation of migration and invasion in NSCLC cells has remained elusive. The present study revealed that miR-145 was downregulated and FSCN1 was upregulated in NSCLC tissues and cell lines. Further investigation showed that overexpression of miR-145 markedly inhibited the protein expression of FSCN1, while knockdown of miR-145 upregulated the protein (but not mRNA) levels of FSCN1 in the NSCLC cell line H129. Moreover, a luciferase reporter assay indicated that FSCN1 is a direct target of miR-145 in NSCLC H129 cells. Furthermore, overexpression of miR-145 markedly inhibited the migration and invasion of NSCLC cells, similar to the effect of small interfering RNA-mediated FSCN1 inhibition in H129 cells. In addition, the inhibitory effect of miR-145 overexpression on migration and invasion was reversed by FSCN1 upregulation in H129 cells. These findings suggested that miR-145 has an inhibitory effect on the migration and invasion in NSCLC cells, at least in part through suppressing the protein expression of its target FSCN1. Therefore, miR-145/FSCN1 may be used as a potential target for the treatment of NSCLC.

Introduction

Lung cancer is the most common malignant tumor type, as well as the leading cause of cancer mortality (1). Despite improvements in surgery combined with radiotherapy and chemotherapy, the prognosis of patients with lung cancer remains poor, with only 14% of patients surviving for five years. Non-small-cell lung cancer (NSCLC) is the most common lung cancer type, accounting for ~90% of lung cancer cases (2). Therefore, the development of effective molecular targets for the treatment of NSCLC is urgently required.

MicroRNAs (miRNAs/miRs), which are non-coding RNAs of 18-25 nucleotides in length, can bind to the 3′-untranslated region (UTR) of mRNAs, causing mRNA degradation or inhibition of gene expression at the post-transcriptional level (3). It has been well established that deregulation of oncogenes or tumor suppressors, including miRNAs, is involved in the development and progression of multiple types of human malignancy (4). Furthermore, deregulation of miR-145 has been reported to have a role in NSCLC (5,6). Downregulation of miR-145 expression is associated with unfavorable prognosis in patients with NSCLC (7). miR-145 also inhibits NSCLC cell proliferation by targeting c-Myc (8). Recently, Zhao et al (9) reported that downregulation of miR-145 contributed to NSCLC cell growth to form brain metastases. However, to date, the exact role of miR-145 in the regulation of NSCLC cell migration and invasion and the underlying mechanisms have not been fully elucidated.

Fascin 1 (FSCN1) is a member of the FSCN family of actin-binding proteins, is responsible for the organization of F-actin into parallel bundles, and participates in the formation of actin-based cellular protrusions. In has been well established that FSCN1 has an important role in the regulation of cell adhesion motility and cellular interactions (10,11). It has been demonstrated that FSCN1 is associated with lymph node metastasis as well as tumor, nodes and metastasis staging but not with cell proliferation in NSCLC, and FSCN1 was shown to promote the migration and invasion of the NSCLC cell line A549 in vitro and in vivo (12). However, to date, the regulatory mechanism of FSCN1 in NSCLC cell migration and invasion has remained elusive.

The present study mainly aimed to explore the detailed role of miR-145 as well as the association between miR-145 and FSCN1 in the regulation of migration and invasion in NSCLC cells. The expression of miR-145 and FSCN1 in NSCLC cancer tissues and cell lines. Furthermore, a luciferase reporter assay was performed to assess whether FSCN1 is a direct target of miR-145, and the effects of FSCN1- or miR-145- upregulation or knockdown on the invasive and migratory potential of NSCLC cells was investigated.

Materials and methods

Agents

TRIzol Agent, fetal bovine serum (FBS), Lipofectamine 2000 and mirVana™ real-time reverse transcription polymerase chain reaction (RT-PCR) microRNA detection kit were purchased from Invitrogen Life Technologies (Carlsbad, CA, USA). Mouse anti-FSCN1 (ab49815; 1:100) and mouse anti-GAPDH (ab8245; 1:100) monoclonal primary antibodies as well as goat anti-mouse (ab175740; 1:20,000) secondary antibody were purchased from Abcam (Cambridge, UK). The Quick-Change Site-Directed Mutagenesis kit was purchased from Stratagene (La Jolla, CA, USA). PsiCHECK™2 vector was purchased from Promega (Madison, WI, USA). Pierce enhanced chemiluminescence (ECL) Western Blotting Substrate was purchased from Pierce Chemical (Rockford, IL, USA).

Tissue specimen collection

All protocols of the present study were approved by the Ethics Committee of Central South University (Changsha, China). Eighteen NSCLC tissues and their matched adjacent normal tissues were collected from adult patients (10 males, 8 females; 36–68 years old; 3 stage I, 5 stage II, 6 stage III and 4 stage IV), freshly resected during surgery at Xiangya Hospital of Central South University (Changsha, China). Tissues were immediately snap-frozen in liquid nitrogen after surgical removal and stored at −70°C prior to use. All participants provided their written consent to participate in the present study.

Cell lines and cell culture

Five human NSCLC cell lines, H358, H460, H129, A549, SK-MES-1, and one normal human lung epithelial cell line, BEAS-2B, were purchased from the Cell Bank of Central South University (Changsha, China). All cell lines were cultured at 37°C with 5% CO2 in Dulbecco's modified Eagle's medium (DMEM; Invitrogen Life Technologies) supplemented with 10% FBS.

RNA extraction and RT-quantitative (q)PCR

Total RNA was extracted from the cells with TRIzol reagent in accordance with the manufacturer's instructions. Reverse transcription was performed using the QuantiTect Reverse Transcription kit (Qiagen, Shanghai, China). The relative expression levels of miR-145 were determined by RT-qPCR using the mirVana™ real-time RT-PCR microRNA detection kit in a total reaction volume of 20 µl, in accordance with the manufacturer's instructions. Specific primer sets for miR-145 and U6 (internal reference for miR-145) were obtained from Genecopoeia (Rockville, MD, USA). Expression of mRNA was detected by RT-qPCR using the standard SYBR Green RT-PCR kit (Qiagen) following the manufacturer's instructions. The specific primer pairs from Shanghai Shenggong Co., Ltd. (Shanghai, China) were as follows: FSCN1 sense, 5′-ATTCTTGGACCACAAGGGAATAC-3′ and anti-sense, 5′-GCCATAAGAGCATAAGCCTCACA-3′; GAPDH (internal reference for FSCN1) sense, 5′-GGAGCGAGATCCCTCCAAAAT-3′ and anti-sense, 5′-GGCTGTTGTCATACTTCTCATGG-3′. Conditions for the cycling conducted using the ABI Prism 7500 Sequence Detection System (Applied Biosystems Life Technologies, Foster City, CA, USA) were as follows: 95°C for 10 min, then 40 cycles of denaturation at 95°C for 15 sec and annealing/elongation at 60°C for 60 sec. The relative mRNA expression was quantified using NanoDrop 1000 (Thermo Fisher Scientific, Waltham, MA, USA) and GraphPad Prism 4.0 software (GraphPad Software, La Jolla, CA, USA) via the 2−ΔΔCt method (13).

Western blot analysis

Cells were solubilized in cold radioimmunoprecipitation assay lysis buffer (Sigma-Aldrich, St. Louis, MO, USA). Proteins were separated by 12% SDS-PAGE (Pierce Chemical) and transferred onto a polyvinylidene difluoride (PVDF) membrane (Pierce Chemical), which was then incubated with Tris-buffered saline containing Tween 20 with 5% milk at room temperature for 3 h. The PVDF membrane was then incubated with mouse anti-FSCN1 and mouse anti-GAPDH primary antibodies at room temperature for 3 h, were washed with phosphate-buffered saline with Tween-20 three times, then were incubated with goat anti-mouse secondary antibody at room temperature for 40 min. Chemiluminescent detection was performed using an ECL kit and X-ray film (Kodak, Tokyo, Japan). The relative protein expression was analyzed using Image-Pro plus software 6.0 (Media Cybernetics, Rockville, MD, USA) and represented as the density ratio versus GAPDH.

Transfection

Plasmids for the expression of FSCN1, miR-145 mimics and miR-145 inhibitor were generated by Nlunbio (Changsha, China). Lipofectamine 2000 was used to perform the transfection according to the manufacturer's instructions. Briefly, plasmid or miRNA mimics and Lipofectamine 2000 were diluted with serum-free medium, respectively. The diluted Lipofectamine 2000 was added to the diluted plasmid or miRNA mimics, respectively, and incubated for 20 min at room temperature, and then added to the cell suspension. Cells were then incubated at 37°C under 5% CO2 for 6 h. The medium in each well was then replaced by the normal serum-containing medium and cultured for 24 h prior to subsequent analysis. H129 cells were transfected with miR-145 mimics, miR-145 inhibitor or FSCN1 siRNA, or cotransfected with miR-145 mimics and the FSCN1 plasmid. Bioinformatical prediction was conducted to analyze the putative target genes of miR-145 using Targetscan (http://www.targetscan.org/).

Dual luciferase reporter assays

The Quick-Change Site-Directed Mutagenesis kit was used to generate a mutant-type 3′-UTR of FSCN1, according to the manufacturer's instructions. The wild- or mutant-type 3′-UTR of FSCN1 was inserted into the psiCHECK™2 vector, respectively. After H129 cells were cultured to ~70% confluence, they were transfected with psiCHECK™2-FSCN1-3′-UTR or psiCHECK™2-mutant FSCN1-3′-UTR vector, with or without 100 nM miR-145 mimics, respectively. After transfection for 48 h, the luciferase activities were determined using an LD400 luminometer (Beckman Coulter, Brea, CA, USA). Renilla luciferase activity was normalized to firefly luciferase activity.

Cell invasion and migration assays

The invasive and migratory abilities of H129 cells were determined in 24-well Transwell chambers (Chemicon, EMD Millipore, Billerica, MA, USA) alone (cell migration assay), or those containing a layer of Matrigel (cell invasion assay). For each group, the H129 cell suspension (1×105 cells/well) was added to the upper chamber, and DMEM containing 10% FBS was added to the lower chamber. After incubation for 24 h, cells which had not transgressed through the membrane as well as the Matrigel on the interior of the inserts were removed using a cotton bud. Invaded/migrated cells on the lower surface of the membrane were stained with gentian violet (Sigma-Aldrich), then rinsed by water and dried at room temperature. Five fields were randomly selected and the cell number was counted under a microscope (CX31 Inverted Microscope; Olympus, Tokyo, Japan).

Statistical analysis

Values are expressed as the mean ± standard deviation of at least three independent experiments. Statistical analysis of differences was performed by one-way analysis of variance. Statistical analysis was performed using SPSS 17 software (SPSS, Inc., Chicago, IL, USA). P<0.05 was considered to indicate a statistically significant difference.

Results

miR-145 is downregulated while FSCN1 is upregulated in NSCLC cell lines and tissues

To reveal the role of miR-145 in NSCLC, RT-qPCR was performed to determine the expression levels of miR-145 in eighteen NSCLC tissues and their matched adjacent normal tissues. As shown in Fig. 1A, the expression levels of miR-145 were frequently reduced in NSCLC tissues compared to those in their matched adjacent normal tissues. The expression levels of miR-145 were then determined in five human NSCLC cell lines and the normal human lung epithelial cell line BEAS-2B. As shown in Fig. 1B, the expression levels of miR-145 were significantly reduced in NSCLC cell lines compared to those in BEAS-2B cells (P<0.01). Furthermore, the expression of FSCN1 was determined by RT-qPCR. As shown in Fig. 1C and D, the mRNA levels of FSCN1 were upregulated in NSCLC tissues and cell lines as compared to those in adjacent normal tissues and the normal human lung epithelial cell line BEAS-2B, respectively (P<0.01). As shown in Fig. 1E, western blot analysis further confirmed that the protein expression of FSCN1 was significantly increased in NSCLC cell lines compared to that in BEAS-2B cells (P<0.01). In conclusion, these results showed that miR-145 was downregulated while FSCN1 was upregulated in NSCLC cell lines. In addition, as H129 cells showed the most obvious changes in miR-145 and FSCN1 expression (Fig. 1B, D and E), the H129 cell line was selected to be used in the following experiments.

miR-145 negatively regulates the protein expression of its target FSCN1 in the NSCLC cell line H129

To investigate the regulatory association between miR-145 and FSCN1 in NSCLC, H129 cells were transfected with miR-145 mimics or inhibitor. Following transfection, miR-145 levels were assessed in H129 cells, which indicated that the transfection was satisfactory (P<0.01; Fig. 2A). Subsequently, the mRNA and protein levels of FSCN1 were assessed using RT-qPCR and western blot analysis, respectively. As shown in Fig. 2B and C, over-expression of miR-145 downregulated the protein (P<0.01), but not the mRNA levels of FSCN1, while knockdown of miR-145 upregulated the protein (P<0.01), but not the mRNA expression of FSCN1 in H129 cells.

FSCN1 is a direct target of miR-145 in H129 cells

The putative seed sequences for miR-145 at the 3′-UTR of FSCN1 are conserved according to bioinformatical prediction. To confirm that FSCN1 is a direct target of miR-145, wild- and mutant-types of the FSCN1 3′-UTR were designed and synthesized (Fig. 3A) and subsequently used in a luciferase reporter assay. The results showed that the luciferase activity was reduced only in H129 cells co-transfected with miR-145 mimics and wild-type FSCN1 3′-UTR (P<0.01; Fig. 3B). However, in the other groups, the luciferase activity was unchanged (Fig. 3B). These results indicated that FSCN1 is a direct target of miR-145 in H129 cells.

Overexpression of miR-145 inhibits the migration and invasion of H129 cells through inhibition of FSCN1

A Transwell assay was further performed to investigate the roles of FSCN1 and miR-145 in the regulation of H129 cell migration and invasion. As shown in Fig. 4A and B, overexpression of miR-145 markedly inhibited H129 cell migration and invasion (P<0.01). Furthermore, in H129 cells transfected with FSCN1 small interfering (si)RNA, cell migration and invasion were also inhibited (P<0.01). In addition, transfection with FSCN1 expression plasmid reversed the inhibitory effect of miR-145 upregulation on H129 cell migration (P<0.01). To further confirm these findings, western blot analysis was performed to examine the protein levels of FSCN1 in each group. As shown in Fig. 4C, transfection with miR-145 mimics or FSCN1 siRNA markedly inhibited the protein expression of FSCN1, while transfection with FSCN1 plasmid reversed the suppressive effect of miR-145 mimics on FSCN1 expression (P<0.01). In conclusion, these results suggested that miR-145 inhibits the migration and invasion through inhibition of FSCN1 in H129 cells.

Discussion

In the present study, the role of miR-145 as well as the association between miR-145 and FSCN1 in the regulation of migration and invasion of NSCLC cells was investigated. It was found that the expression levels of miR-145 were reduced, while the expression levels of FSCN1 wre increased in NSCLC tissues and cell lines. Further investigation identified FSCN1 as a direct target of miR-145, and the protein (but not mRNA) expression of FSCN1 was negatively regulated by miR-145 in the NSCLC cell line H129. Furthermore, overexpression of miR-145 significantly inhibited H129 cell migration and invasion, similar to the effect of siRNA-mediated FSCN1 inhibition in H129 cells. Of note, the inhibitory effect of miR-145 overexpression on migration and invasion was reversed by upregulation of FSCN1 expression in H129 cells.

Increasing evidence demonstrates that miR-145 acts as a tumor suppressor in various cancer types. Kou et al (14) reported that miR-145 inhibited invasion of bladder cancer cells by inhibition of p21 protein (Cdc42/Rac)-activated kinase 1 and matrix metalloproteinase 9 (MMP9). Boufraqech et al (15) showed that miR-145 suppressed thyroid cancer growth and metastasis via targeting AKT. Cho et al (16) found that the expression levels of miR-145 were significantly reduced in lung cancer tissue with adjacent normal lung parenchyma, and overexpression of miR-145 markedly inhibited cell growth in epidermal growth factor receptor-mutant lung adenocarcinoma. In the present study a significant downregulation of miR-145 expression in NSCLC tissues and cell lines was identified. In adition, Chen et al (8) reported that overexpression of miR-145 markedly inhibited cell growth and blocked the G1/S transition in the NSCLC cell lines A549 and H23 via suppressing the c-Myc/eIF4E pathway. However, evidence regarding the role of miR-145 in the regulation of NSCLC cell migration and invasion has remained limited.

In the present study, overexpression of miR-145 markedly inhibited the migration and invasion of NSCLC H129 cells, suggesting that miR-145 may be associated with NSCLC metastasis. In fact, the effect of miR-145 on cancer metastasis has been suggested in several types of cancer. Gao et al (17) found that miR-145 suppressed tumor metastasis by inhibiting N-cadherin protein translation, and indirectly downregulating the downstream effector MMP9. Lu et al (18) showed that miR-145 inhibited the migration and invasion of glioma cells via direct inhibition of ADAM17 expression. Zhang et al (19) reported that miR-145 suppressed the invasion and metastasis of neuroblastoma cells through targeting hypoxia-inducible factor 2 alpha.

Only few studies have focused on the underlying molecular mechanism of the involvement of miR-145 in the development and progression of NSCLC (20). The present study identified one of its targets, FSCN1, which is involved in the miR-145-mediated downregulation of NSCLC cell migration and invasion. As an invadopodia-associated protein, FSCN1 has been demonstrated to have an important role in the regulation of cell adhesion motility and cellular interactions (10,11). Accumulating evidence suggests that FSCN1 also acts as an oncogene in human malignancies. For instance, upregulation of FSCN1 expression was shown to be a potential marker of poor prognosis for patients with high-grade serous ovarian carcinoma, and knockdown of FSCN1 suppressed the proliferation, migration and invasion in ovarian cancer cells (21). Knockdown of FSCN1 expression inhibited the proliferative and migratory abilities of gastric cancer cells (22). Moreover, it has been well established that the expression of FSCN1 is regulated by miRNAs in various cancer types. For instance, miR-451 regulates the expression of FSCN1, which is involved in colorectal cancer cell migration (23). Akanuma et al (24) showed that miR-133a inhibited the proliferation and invasion of esophageal squamous cell carcinoma cells via directly targeting FSCN1. In the present study, miR-145 suppressed NSCLC cell migration and invasion via inhibition of FSCN1 expression. This association between miR-145 and FSCN1 has been indicated in several other cancer types, including bladder cancer, prostate cancer, esophageal squamous cell carcinoma, and colorectal cancer (2528). Therefore, the present study expanded the understanding of the molecular mechanism involving miR-145 and FSCN1 in malignant tumors.

In conclusion, the present study was the first, to the best of our knowledge, to suggest that miR-145 suppresses NSCLC cell migration and invasion, at least in part through inhibition of FSCN1 protein expression, suggesting that miR-145/FSCN1 signaling may serve as a potential target for the treatment of NSCLC.

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October-2015
Volume 12 Issue 4

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Zhang Y, Yang X, Wu H, Zhou W and Liu Z: MicroRNA-145 inhibits migration and invasion via inhibition of fascin 1 protein expression in non-small-cell lung cancer cells Retraction in /10.3892/mmr.2021.12365. Mol Med Rep 12: 6193-6198, 2015
APA
Zhang, Y., Yang, X., Wu, H., Zhou, W., & Liu, Z. (2015). MicroRNA-145 inhibits migration and invasion via inhibition of fascin 1 protein expression in non-small-cell lung cancer cells Retraction in /10.3892/mmr.2021.12365. Molecular Medicine Reports, 12, 6193-6198. https://doi.org/10.3892/mmr.2015.4163
MLA
Zhang, Y., Yang, X., Wu, H., Zhou, W., Liu, Z."MicroRNA-145 inhibits migration and invasion via inhibition of fascin 1 protein expression in non-small-cell lung cancer cells Retraction in /10.3892/mmr.2021.12365". Molecular Medicine Reports 12.4 (2015): 6193-6198.
Chicago
Zhang, Y., Yang, X., Wu, H., Zhou, W., Liu, Z."MicroRNA-145 inhibits migration and invasion via inhibition of fascin 1 protein expression in non-small-cell lung cancer cells Retraction in /10.3892/mmr.2021.12365". Molecular Medicine Reports 12, no. 4 (2015): 6193-6198. https://doi.org/10.3892/mmr.2015.4163