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Over-expression of long noncoding RNA BANCR inhibits malignant phenotypes of human bladder cancer

Journal of Experimental & Clinical Cancer Research volume 35, Article number: 125 (2016) Cite this article

Abstract

Background

Accumulating evidences indicated that lncRNAs play crucial regulatory roles in oncogenesis and progression of cancers. BRAF activated non-coding RNA (BANCR) has been identified to contribute to the progression of some human cancers. However, the relationship between BANCR and bladder cancer (BC) is largely unclear.

Methods

BANCR expression levels in BC, paired non-cancer tissues and BC cell lines were detected by real-time quantitative RT-PCR (qRT-PCR). The relationships between BANCR expression levels and the clinical characteristics were evaluated. BANCR expression was enhanced by transfecting a pcDNA-BANCR vector. We used both CCK-8 assay and Edu assay to detect cell proliferation. We also detect cell apoptosis and migration by using ELISA assay, Flow cytometry and transwell assay, respectively. All statistical analyses were executed by using the SPSS 20.0 software.

Results

BANCR expression levels were remarkably decreased in BC tissues compared with adjacent noncancerous tissues. BANCR expression levels in two BC cell lines were also significantly down-regulated. Clinicopathologic analysis revealed that low BANCR expression was positively correlated with TNM stage, but not associated with other clinicopathological characteristics. BANCR has been successfully overexpressed in BC cell lines (T24 and SW780) by transfecting a pcDNA-BANCR vector. Cell proliferation inhibition, apoptosis induction and migration suppression were also observed in pCDNA-BANCR-transfected T24 and SW780 cells.

Conclusions

These data suggested that BANCR represents a tumor suppressor player in bladder cancer, contributes to tumor proliferation, apoptosis and migration, and may serve as a new candidate biomarker and a potential therapeutic target for patients with BC.

Background

Bladder cancer (BC) is one of the most common malignancies over the world, and its incidence and mortality have captured great attention in the past decades [1, 2]. Although a variety of treatments are available for patients with bladder cancer, such as surgery, chemotherapy and radiation therapy, but the 5-year cancer-specific survival rate remains frustrated [3–5]. Lack of sophisticated understanding of pathogenetic mechanism is one of the most crucial reasons for high case fatality rate of bladder cancer. So, revealing the pathogenetic mechanism of bladder cancer is indispensable for developing an effective diagnosis or treatment.

With the rapid development of second-generation sequencing technology, a multitude of long noncoding RNAs (lncRNAs) have been found to be dysregulated and involved in the development of various human diseases, particularly in cancers [6–8]. Accumulating evidences demonstrated that lncRNAs play important regulatory roles in diverse cellular processes, such as regulation of gene expression, posttranslational processing and tumorigenesis [7, 9]. BRAF activated non-coding RNA (BANCR), a 693-nt lncRNA encoded on human chromosome 9, has been found to be aberrant expressed in quite a few cancers, such as colorectal cancer [10], retinoblastoma [11], melanoma [12], papillary thyroid carcinoma [13], lung carcinoma [14],gastric cancer [15] and hepatocellular carcinoma [16]. However, the significance of lncRNA BANCR in bladder cancer is completely unknown.

Thus, in the present research, we identified the clinical significance of lncRNA BANCR in 54 clinical bladder cancer samples and investigated the effects of BANCR expression on bladder cancer cells in vitro. Moreover, further experiments indicated that the overexpression of lncRNA BANCR could inhibit proliferation, induce apoptosis and suppress migration of the bladder cancer cell lines.

Methods

Patient samples

In this research, a total of 54 patients with urothelial neoplasms of the bladder who received radical cystectomy were included. Bladder cancer tissues and their pair-matched adjacent normal tissues were snap-frozen in liquid nitrogen quickly after resection.

Cell lines and cell culture

Human bladder cancer cell lines (T24, SW780) and SV-40-immortalized human uroepithelial cell line (SV-HUC-1) were purchased from the Institute of Cell Biology, Chinese Academy of Sciences (Shanghai, China). The T24 and SW780 cells were cultured in Dulbecco’s Modified Eagle Medium (Invitrogen, Carlsbad, CA, USA) plus 1 % antibiotics (100U/ml penicillin and100 μg/ml streptomycin sulfates) and 10 % fetal bovine serum (FBS). The SV-HUC-1 cells were cultured in F12K (Invitrogen, Carlsbad, CA, USA) plus 1 % antibiotics (100U/ml penicillin and100 μg/ml streptomycin sulfates) and 10 % fetal bovine serum (FBS). All cells were cultured at 37 °C, in a humidified atmosphere with 5 % CO2.

Plasmid DNA Transfection

The BANCR sequence and negative control were synthesized and subcloned into pCDNA3.1 (GenePharma, Suzhou, China) vector. The pCDNA-BANCR or negative control was transfected into T24 and SW780 cells cultured in six-well plates using Lipofectamine 3000 Transfection Reagent (Invitrogen, Carlsbad, CA, USA) according to the manufacturer’s protocol. The expression level of BANCR was detected by qRT-PCR.

RNA extraction and qRT-PCR

All total RNA was extracted from bladder cancer tissues or cells after transfection by using the Trizol reagent (Invitrogen, Carlsbad, CA, USA) according to the manufacturer’s protocol. Qualified total RNA was then reverse transcribed to cDNA by utilizing Prime Script RT Reagent Kit with gDNA Eraser (Takara, Dalian, China) following the manufacturer’s instructions. The quantitative real-time polymerase chain reaction (qRT-PCR) was executed using SYBR Green PCR kit (Takara, Dalian, China) following the manufacturer’s instructions. Glyceraldehyde 3-phosphate dehydrogenase (GAPDH) was measured as an internal control. The primer sequences were as follows: BANCR primers: 5’- ACAGGACTCCATGGCAAACG-3’ (forward) and 5’- ATGAAGAAAGCCTGGTGCAGT-3’ (reverse), and GAPDH primers: 5’-CGCTCTCTGCTCCTCCTGTTC-3’ (forward), 5’–ATCCGTTGACTCCGACCTTCAC-3’ (reverse). The reactions were carried out on an ABI PRISM 7300 Fluorescent Quantitative PCR System (Applied Biosystems, Foster City, CA, USA) in triplicate. The average value in each triplicate was used to calculate the relative amount of BANCR using 2−ΔΔCt methods.

Cell proliferation assays

Cell proliferation was determined by using Cell Counting Kit-8, CCK-8 (Beyotime Institute of Biotechnology, Shanghai, China) and 5-ethynyl-20-deoxyuridine (Edu) assay kit (Ribobio, Guangzhou, China), respectively, according to the manufacturer’s instructions. For CCK-8 assay, 5 × 103cells/ well were seeded in a 96-well plate for 24 h, then transiently transfected with pCDNA-BANCR or negative control. CCK-8 assay was performed according to the previous study. Edu incorporation assay was carried out according to previous studies [17]. All experiments were performed at least three times.

Caspase-3 ELISA assay

Bladder cancer cells T24 and SW780 were transfected with pCDNA-BANCR or negative control. At 48 h after transfection, the activity of caspase 3 was detected by using the Caspase-3 Colorimetric Assay kit (Abcam, Cambridge, UK) according to the manufacturer’s protocol. Each experiment was performed in triplicate.

Flow cytometry assay

T24 and SW780 cells were transfected with pCDNA-BANCR or negative control in normal medium. After 48 h, cells were harvested for flow cytometry assay. After double staining with FITC-Annexin V and PI according to the manufacturer’s instructions, cell apoptosis was determined by using flow cytometry (EPICS, XL-4, Beckman, CA, USA).

Transwell assay

The cell motility assay were performed using a transwell insert (8 μm, Corning). After 24 h, 5x104 cells transfected with pCDNA-BANCR or negative control were first starved in 200 ml serumfree medium and then placed in the uncoated dishes. Transwell assay was performed according to one previous study [18].

Statistical analyses

All statistical analyses were executed by using SPSS 20.0 software (IBM, Chicago, IL, USA). Paired samples’t test was used to analyze the BANCR expression difference between bladder cancer tissues and para-cancer tissues. CCK-8 assay data were analyzed by ANOVA and independent samples’ t test was utilized to analyze other data. The chi-square test was used to exam the relationship between BANCR expression level and clinicopathologic characteristics. Differences were considered statistically significant at p < 0.05.

Results

BANCR was down-regulated in bladder cancer tissues and cells

The relative expression level of BANCR was measured by using qRT-PCR in bladder cancer tissues and pair-matched adjacent normal bladder tissues from 54 bladder cancer patients. Compared with pair-matched adjacent normal bladder tissues, the BANCR expression was down-regulated significantly in 64.8 % (35 of 54) of cancer tissues (Fig. 1a and b, ***P < 0.001). Moreover, down-regulated BANCR expression was significantly correlated with advanced TNM stage (Fig. 1c, **P < 0.01). Compared with the SV-HUC-1 cell line, the BANCR expression was decreased significantly in bladder cancer cellsT24 and SW780 (Fig. 1d, **P < 0.01). These data demonstrated that BANCR may function as a tumor suppressor gene in bladder cancer. Patients’ clinical parameters are listed in Table 1.

Fig. 1
figure 1

The long noncoding RNA BANCR was down-regulated in bladder cancer. The relative expression levels of BANCR were determined using RT- qPCR. a BANCR expression levels were lower in bladder cancer tissues. b The relative expression level of BANCR was significantly lower in bladder cancer tissues compared with pair-matched adjacent normal bladder tissues. c BANCR expression levels were dramatically lower in patients with higher TNM stage. d BANCR expression levels were lower in bladder cancer T24 and SW780 cells than those in SV-40-immortalized human uroepithelial cells. e The pCDNA-BANCR significantly up-regulated the expression level of BANCR in SW780 and T24 cells. Data (b and c) are shown as mean ± SEM. Data (d and e) are shown as mean ± SD. (**P < 0.01, ***P < 0.001)

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Table 1 Correlation between BANCR expression and clinicopathological characteristics of bladder cancer patients
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Specific plasmid vectors up-regulated the expression of BANCR

Bladder cancer cell lines T24 and SW780 were cultured and transfected with pCDNA-BANCR or negative control. At 48 h after transfection, the related expression level of BANCR was analyzed by qRT-PCR and the results showed that the relative expression level of BANCR in T24 and SW780 (Fig. 1e, **P < 0.01) cells was significantly up-regulated.

Overexpression of BANCR inhibited cell proliferation

To explore the possible impact of BANCR on the growth of bladder cancer cells, the cell proliferation activities of T24 and SW780 were determined by both CCK-8 assay and Edu assay. Compared with the negative control group, cell growth arrest was observed in bladder cancer cells T24 (Fig. 2a, c and e) and SW780 (Fig. 2b, d and f) which were cultured and transfected with pCDNA-BANCR. The results suggested that BANCR inhibits cell proliferation in bladder cancer cells.

Fig. 2
figure 2

Overexpression of lncRNA BANCR inhibited cell proliferation in bladder cancer cells. Cell proliferation was detected by both CCK-8 assay and Edu assay. Cell proliferation inhibition was observed in bladder cancer T24 (a, c and e), SW780 (b, d and f). Data are shown as mean ± SD. (**P < 0.01, ***P < 0.001)

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Overexpression of BANCR induced apoptosis

Furthermore, we investigated whether BANCR could induce cell apoptosis in bladder cancer. Bladder cancerT24 and SW780 cells were transfected with pCDNA-BANCR or negative control. The relative activity of caspase-3 was determined using the caspase 3 enzyme-linked immunosorbent assay (ELISA) (Fig. 3a, d) and the apoptosis ratio in bladder cancer cells was measured using flow cytometry assay. (Figure 3b, c, e and f). Induced cell apoptosis was observed in both bladder cancer and SW780 cell lines. These results indicated that BANCR induces cell apoptosis in bladder cancer.

Fig. 3
figure 3

Overexpression of lncRNA BANCR induced cell apoptosis in bladder cancer cells. Cell apoptosis was determined by both ELISA assay and Flow cytometry. Induced cell apoptosis was observed in bladder cancer T24 (a, b and c) and SE780 (d, e and f) cells. Data are shown as mean ± SD. (**P < 0.01, ***P < 0.001)

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Overexpression of BANCR inhibited cell migration

Lastly, we further determined whether BANCR suppressed cell migration in bladder cancer. The cell migration activities of bladder cancer T24 and SW780 cells transfected with pCDNA-BANCR or negative control were determined by transwell assay. Cell migration arrest was observed in T24 (Fig. 4a, b), SW780 (Fig. 4c, d) as expected. These results manifested that BANCR inhibits cell migration in bladder cancer.

Fig. 4
figure 4

overexpression of lncRNA BANCR inhibited cell migration in bladder cancer cells. Cell migration was detected by transwell assay. Cell migration inhibition was observed in bladder cancer T24 (a and b) and SW780 (c and d) cells. Data are shown as mean ± SD. (**P < 0.01, ***P < 0.001)

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Discussion

Until now, lots of works indicate that lncRNAs play vital regulatory roles in tumorigenesis and tumor progression and act as potential oncogenes or tumor suppressor genes [19, 20]. Recently, several lncRNAs have been found to play an emerging role in various cancers, contributing to tumor proliferation, apoptosis, and survival, such as PANDAR [18], MEG3 [21].

BANCR, firstly found by Flockhart RJ et al. [22], has been discovered to be up-regulated in some kinds of tumors, including retinoblastoma, melanoma, papillary thyroid carcinoma, gastric cancer and hepatocellular carcinoma. In contrast, decreased expression of BANCR has been found in both colorectal and lung cancers. BANCR promotes cell proliferation by regulating MAPK pathway activation in both malignant melanoma and lung carcinoma [14, 23]. Besides, downregulation of BANCR promotes colorectal cancer cell proliferation through decreasing expression of p21 protein [10]. Furthermore, BANCR expression promoted non-small cell lung cancer cell migration and invasion through regulating E-cadherin, N-cadherin and Vimentin expression, all of which play crucial roles in epithelial-mesenchymal transition (EMT) [24]. These evidences suggest that BANCR may be involved in different signaling pathways and plays its unique role in each cancer. However, the functions of BANCR in bladder cancer were completely unknown.

To the best of our knowledge, this is the first evidence that BANCR was significantly downregulated in bladder cancer tissues compared with adjacent noncancerous tissues, and low BANCR expression in bladder cancer patients was positively correlated with advanced TNM stage. Furthermore, compared with the SV-HUC-1 cell line, the BANCR expression in bladder cancer cell lines (T24, SW780) was also obviously downregulated. These results manifest that lncRNA BANCR may emerge as a novel player in bladder cancer. To further explore the biological functions of lncRNA BANCR, we detected the cell proliferation, apoptosis and migration by overexpressing BANCR in bladder cancer T24 and SW780 cells. pCDNA-BANCR-mediated overexpression of BANCR significantly inhibited proliferation, promoted apoptosis and suppressed metastasis capabilities of bladder cancer T24 and SW780 cells compared with control group, suggesting that up-regulated BANCR expression could suppress the progression and development of bladder cancer.

Conclusion

In conclusion, the present study suggested that lncRNA BANCR was decreased in BC tissues and correlated with advanced TNM stage. Moreover, we preliminarily revealed the significant function of BANCR in regulating cell proliferation, apoptosis, and migration of BC cells. These findings indicated that BANCR may emerge as a tumor suppressor gene and could become a novel promising candidate for the prognosis and therapy for BC in the future. However, the prognostic role of BANCR should be verified in a larger case series, composed by firstly diagnosed patients, treated with TURB instead of cystectomy and with a minimum of 3 years of follow up. Moreover, the molecular mechanism by which BANCR was decreased in bladder cancer also should be investigated in the future works.

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Acknowledgments

The authors are indebted to all the donors whose names were not included in the author list, but who participated in our study.

Funding

This work was supported by the National Key Basic Research Program of China (973 Program) [2014CB745201], National Natural Science Foundation of China [81402103], China Postdoctoral Science Foundation [2015 M572405], Clinical Doctor Basic Scientist Combination Foundation of Shenzhen Second People's Hospital, Shenzhen Foundation of Science and Technology [JCYJ20150330102720182] and National Natural Science Foundation of China [81502684], Shenzhen Health and Family Planning Commission Scientific Research Project [201506026].

Availability of data and materials

Literature collection was performed by using electronic databases PubMed, Cochrane Library, and Web of Science. All statistical analyses were executed by using SPSS 20.0 software (IBM, Chicago, IL, USA).

Raw and processed data are stored in corresponding author of this paper and are available upon request.

Authors’ contributions

AH and YL conceived and designed the experiments. AH, ZC and YL performed the experiments. JL, MC, and LL coordinated the research and analyzed the data. ZL, XL and YZ supported the experiments and helped to draft the manuscript. CZ and JL performed the statistical analysis. AH, YL and ZC wrote the manuscript. WH and HM provided the financial support and supervised laboratorial processes. All authors read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Not applicable

Ethical approval and consent to participate

All subjects signed an informed consent form. The study was approved by the institutional research ethics committee of Shenzhen Second People’s Hospital. Moreover, written consent was received from each patient.

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    Authors and Affiliations

    1. Shenzhen Second People’s Hospital, Clinical Medicine College of Anhui Medical University, Shenzhen, 518039, Guangdong, China

      Anbang He, Mingwei Chen & Hongbing Mei

    2. Key Laboratory of Medical Reprogramming Technology, Shenzhen Second People’s Hospital, The First Affiliated Hospital of Shenzhen University, Shenzhen, 518035, China

      Anbang He, Yuchen Liu, Zhicong Chen, Jianfa Li, Mingwei Chen, Li Liu, Xinhui Liao, Zhaojie Lv, Yonghao Zhan, Chengle Zhuang, Junhao Lin, Weiren Huang & Hongbing Mei

    3. Shantou University Medical College, Shantou, 515041, China

      Zhicong Chen, Jianfa Li, Li Liu, Yonghao Zhan, Chengle Zhuang & Junhao Lin

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    1. Anbang He
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    He, A., Liu, Y., Chen, Z. et al. Over-expression of long noncoding RNA BANCR inhibits malignant phenotypes of human bladder cancer. J Exp Clin Cancer Res 35, 125 (2016). https://doi.org/10.1186/s13046-016-0397-9

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    Journal of Experimental & Clinical Cancer Research

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