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Inhibitory effect of icariin on osteosarcoma cell proliferation via the Wnt/β-catenin signaling pathway

  • Authors:
    • Yuxin Ren
    • Fuqiang Zhu
    • Zhendong Liu
  • View Affiliations

  • Published online on: May 29, 2018     https://doi.org/10.3892/ol.2018.8821
  • Pages: 1405-1410
  • Copyright: © Ren et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Osteosarcoma, is a kind of malignant tumor derived from malignant interstitial cells. The pathogenesis of osteosarcoma remains unclear and despite use of chemotherapy drugs, resistance to these drugs affects the success of treatment. The present study was conducted to investigate the effects of icariin (ICA) on osteosarcoma cell proliferation and to investigate the role of the Wnt/β-catenin signaling pathway in the inhibition process of ICA on osteosarcoma cell proliferation. Different concentrations of ICA were selected to treat the osteosarcoma cell line 143B for 24 h, and then the onset concentration of ICA when it inhibited the growth of osteosarcoma cancer cell line 143B was detected via an MTT assay. The effect of ICA on the apoptosis of colon cancer cell line 143B under this concentration was detected using a flow cytometer. RNA in osteosarcoma cell line 143B was extracted, followed by reverse transcription. The expression levels of related and apoptotic proteins in the Wnt/β-catenin signaling pathway using ICA were detected by semi-quantitative PCR and western blot analysis, respectively. The expression quantities of vascular endothelial growth factor (VEGF) and MMP-9 were detected by ELISA. MTT assay showed that ICA inhibited the growth of 143B when its concentration was 5 µM (p<0.01). Flow cytometry showed that the number of apoptotic cells after ICA treatment was significantly higher than that in control group (p<0.01). RNA in osteosarcoma cell line 143B was extracted, followed by reverse transcription. Semi‑quantitative PCR and western blot analysis revealed that the expression levels of p-GSK3β, β-catenin, c-Myc and cyclin D1 in cells after ICA treatment were significantly downregulated (p<0.01), while the expression level of caspase-3 was significantly increased (p<0.01). ELISA showed that the expression quantities of VEGF and MMP-9 were significantly decreased (p<0.01). Thus, ICA can significantly inhibit osteosarcoma cell proliferation and promote osteosarcoma cell apoptosis, which may be realized by affecting the expression of the Wnt/β‑catenin signaling pathway and blocking the expression of related proteins.

Introduction

Osteosarcoma, as a kind of malignant tumor derived from malignant interstitial cells, has certain osteoid characteristics, including a strong migration capacity and frequent systemic metastasis (1). The pathogenesis of osteosarcoma remains unclear and the osteosarcoma of osteoblasts is a clinically common form at present, which generally occurs in the metaphysis of long-tubular bone, but seldom in the axial skeleton (2,3). The malignant grade of osteosarcoma is high, micro-lesion metastasis is possible during diagnosis, while lung tissue is a common metastatic site (4). Prior to the application of chemotherapeutic drugs, amputation was commonly used in the treatment of osteosarcoma. The rise and development of chemotherapy drugs has been useful in the treatment of osteosarcoma. However, drug resistance of chemotherapy drugs delays the treatment of osteosarcoma (5). Icariin (ICA), also known as Epimedium brevicornu, is sweet and warm. It has the effect of nourishing kidney and strengthening yang, strengthening tendons and bones, dispelling wind and eliminating dampness, expelling furuncle and resolving carbuncle. ICA is often clinically used in the treatment of flaccid bones and muscles and rheumatic arthralgia (68). Recent findings have shown that ICA has the effect of promoting osteoblast proliferation and increasing ALP activity in osteoblasts, thus promoting the calcification of bone matrix and enhancing bone strength (9). Zhang et al (10) found that ICA can significantly increase osteocytes and promote osteocyte differentiation. Zhang et al (11) found that ICA can increase the apoptosis of osteoclastoma. However, to the best of our knowledge, there is no report currently available on the effect of ICA on osteosarcoma cells and its mechanism.

In this study, the effect of ICA on osteosarcoma cell proliferation and its mechanism were studied to clarify the mechanism of ICA for osteosarcoma cells, in order to provide new ideas for the efficacious development of ICA and clinical treatment of osteosarcoma.

Materials and methods

Instruments and materials

Osteosarcoma cancer cell line 143B (Cell Bank of the Chinese Academy of Sciences, Shanghai, China), methyl thiazolyl tetrazolium (MTT) and DMSO (both from Sigma-Aldrich; Merck KGaA, Darmstadt, Germany), ICA (Aladdin Shanghai Biochemical Technology Co., Ltd., Shanghai, China), TRIzol kit and reverse transcription kit (both from Invitrogen, Carlsbad, CA, USA), VEGA ELISA kit and MMP-9 ELISA kit (both from R&D Systems, Inc., Minneapolis, MN, USA), rabbit anti-DKK1, rabbit anti-caspase-3, rabbit anti-β-catenin, rabbit anti-GSK3β, rabbit anti-pGSK3β (Ser9) and GAPDH (all from Cell Signaling Technology, Inc., Danvers, MA, USA), ECI luminescent solution (Invitrogen), inversed fluorescent microscope (Thermo Fisher Scientific GmbH, Dreieich, Germany), cell culture flask (Corning Inc., Corning, NY, USA), pipettor (Eppendorf, Hamburg, Germany), PCR instrument (Applied Biosystems, Foster City, CA, USA), UV imaging system (Biometra, Goettingen, Germany), and electronic balance (BP121S; Sartorius AG, Goettingen, Germany) were used in the study. Any other equipment and reagents were previously described in the relevant section.

Detection of inhibitory effect of ICA on osteosarcoma cell growth via MTT assay

After osteosarcoma cancer cell line 143B was revived (12), it was placed in the incubator, and cells in the logarithmic growth phase were inoculated onto the 96-well plate after subculture (8×103/well). [Of note, the 143B cell line used in the present study is possibly identified as osteosarcoma cell line HTK-osteosarcoma cell line (13); however, it did not affect the conclusions drawn in the study.] After inoculation for 24 h, the serum was deprived for 24 h and ICA was added at different concentrations (20, 10, 5, 2, 1 and 0.1 µM). The blank control group and the positive drug group (cisplatin) were then set up. After incubation with medication for 24 h, 1% MTT was added to incubate the cells for 4 h in the dark. The medium was discarded and 150 µl dimethyl sulfoxide was added to each well. After vibration for 10 min, the absorbance value at 570 nm was measured using the microplate reader (Thermo Fisher Scientific; Waltham, MA, USA).

Effects of ICA on osteosarcoma cell apoptosis

The 143B colon cancer cell line was cultured as follows. The cell density was adjusted to 5×106 cells/ml and added into the 6-well plate, and the cells were then divided into the blank control, ICA (5 µM) and positive drug groups. After treatment for 24 h, the cells were washed with pre-cooled PBS twice, re-suspended and centrifuged at 12,000 × g for 5 min. Fluorescent solution was added to incubate the cells at room temperature for 15 min in the dark. The cells were then detected using a flow cytometer (Thermo Fisher Scientific, Inc., Waltham, MA, USA).

Detection of the expression of related genes via semi-quantitative PCR

The cell proteins treated with 5 µM ICA for 24 h were extracted using a TRIzol kit, and the supernatant was discarded via centrifugation for 10 min at 6,000 × g. The RNA integrity was confirmed by agarose gel electrophoresis. The results of electrophoresis showed that 28S, 18S and 5S bands were clear, and the brightness of 28S band was approximately twice of that of 18S band, indicating that RNA was intact and can be used for subsequent experiments. cDNA was obtained via reverse transcription using the reverse transcription kit. An appropriate internal reference was selected. The expression levels of c-Myc, cyclin D1 and β-catenin in the Wnt/β-catenin signaling pathway, apoptosis-related gene caspase-3 and migration-related gene MMP-9 and VEGF were detected via semi-quantitative PCR. Reaction conditions were: denaturation, 95°C for 30 sec; annealing, 64°C for 25 sec; and extension 72°C for 30 sec, for a total of 35 cycles. Primers were produced by Tiangen Biotech Co., Ltd. (Beijing, China). Primer sequences are shown in Table I. After the reaction, agarose gel electrophoresis was performed, followed by observation using a UV imaging system.

Table I.

PCR primer.

Table I.

PCR primer.

Gene namePrimer sequences
c-MycF: 5′-ATCCAGAGACAAGACATGTAC-3′
R: 5′-TTCAGATGTTCTAAGCCTACGG-3′
β-cateninF: 5′-TGGCGGTTTGCGGTGGAC-3′
R: 5′-CCAGTGCAGGGTCCGAGGT-3′
Cyclin D1F: 5′-GATGATTGGCATGGCTTT-3′
R: 5′-CACCTTCCGTTCCAGTTT-3′
Caspase-3F: 5′-GATGGGACTGTGGTTACCGT-3′
R: 5′-GGTGAAACTCTTGCCTCGTC-3′
MMP-9F: 5′-GATGATTGGCATGGCTTT-3′
R: 5′-GCCATACGCTGACCTTTCA-3′
VEGFF: 5′-GGAGTCCATTGGTGCTTGA-3′
R: 5′-ACACCCTTTCCAATGTGCC-3′
GAPDHF: 5′-GATGATTGGCATGGCTTT-3′
R: 5′-CACCTTCCGTTCCAGTTT-3′

[i] F, forward; R, reverse; VEGF, vascular endothelial growth factor.

Detection of the expression of related proteins via western blot analysis

The cells in the logarithmic growth phase were inoculated onto the 96-well plate, and the blank control and ICA groups (5 µM) were established. After medication for 24 h, the protein was extracted and quantified, followed by separation via SDS-PAGE and the protein was transferred to PVDF membrane. The target band was cut off after sealing for 2 h. The target protein antibody [anti-caspase-3, rabbit monoclonal antibody, catalogue no. 9665; anti-β-catenin, rabbit monoclonal antibody, catalogue no. 9582; monoclonal antibody anti-GSK3β, monoclonal antibody, rabbit 12456; anti-pGSK3β (Ser9), monoclonal antibody, rabbit 5558; cyclin D1, rabbit monoclonal antibody, catalogue no. 2978; and CMYc, rabbit monoclonal antibody, catalogue no.13987 were procured from Cell Signaling Technology, Inc., Danvers, MA, USA] was used to incubate the protein at 4°C overnight. After washing with Tris-buffered saline Tween-20 (TBST) three times (5 min/time), the secondary antibody was incubated at room temperature for 2 h. After washing with TBST again three times, the appropriate amount of ECL solution (solution A and B were mixed at a ratio of 1:1) was added in the dark, followed by performing of the experiment, and the performing time was determined according to the fluorescence intensity of the protein band. Following development and fixation, the band was scanned and received gray value analysis via ImageJ software. The expression levels of related proteins in the Wnt/β-catenin signaling pathway, p-GSK3β, c-Myc, cyclin D1 and β-catenin, and apoptosis protein caspase-3 were detected.

Detection of the expression levels of VEGF and MMP-9 via ELISA

The cells in the logarithmic growth phase were inoculated onto the 24-well plate, and the blank control and ICA groups (5 µM) were set up. After medication for 24 h, the supernatant was collected and the expression levels of VEGF and MMP-9 in cells were detected using an ELISA kit.

Statistical analysis

Data were presented as mean ± standard deviation and analyzed by SPSS 19.0 (SPSS Inc., Chicago, IL, USA) software. The t-test was used for measurement data, while the Chi-square test was used for enumeration data. One-way analysis of variance (ANOVA) was used for other data. Bonferronic method was used for pairwise comparison under homogeneity of variance, while the Welch method was used under heterogeneity of variance. Dunnett's T3 method was used for multiple comparisons.

Results

Inhibitory effect of ICA on osteosarcoma cell growth

The inhibitory effect of ICA on the osteosarcoma cell 143B was detected via MTT assay. The results are shown in Fig. I. ICA concentrations were set as 20, 10, 5, 2, 1 and 0.1 µM, and the blank control and positive control groups (cisplatin) were established. The results showed that ICA significantly inhibited the 143B cell growth when its concentration reached 5 µM (p<0.01).

Effects of ICA on osteosarcoma cell apoptosis

The effects of ICA on the apoptosis of osteosarcoma cell 143B were detected via a flow cytometer. The results are shown in Fig. 2. After 5 µM ICA was added to the osteosarcoma cell 143B, the number of apoptotic cells in the ICA group was significantly increased compared with that in the blank control group, and the difference was statistically significant (p<0.01).

Detection of related gene expressions via semi-quantitative PCR

After the RNA of osteosarcoma cell 143B treated with ICA was extracted, the relative expression quantities of related genes were detected via semi-quantitative PCR with GAPDH as the internal reference. The results are shown in Figs. 35. Fig. 3 shows that compared with those in the blank control group, the expression levels of β-catenin were decreased after ICA treatment, and the expression levels of its downstream genes c-Myc and cyclin D1 were also significantly decreased (p<0.01). Fig. 4 shows that the expression level of caspase-3 was significantly increased after ICA treatment (p<0.01). Fig. 5 shows that the expression levels of MMP-9 and VEGF were decreased after ICA treatment (p<0.01).

Detection of expression levels of related proteins via western blot analysis

The expression levels of related proteins in osteosarcoma cell 143B treated with ICA (5 µM) were detected via western blot analysis, and the results are shown in Figs. 6 and 7. Fig. 6 shows that the protein expression levels in p-GSK3β, β-catenin and its downstream genes c-Myc and cyclin D1 were significantly decreased after ICA treatment (p<0.01). Fig. 7 shows that the protein expression level in caspase-3 was significantly increased after ICA treatment (p<0.01).

Detection of the expression levels of VEGF and MMP-9 via ELISA

The protein expression levels in VEGF and MMP-9 in osteosarcoma cell 143B treated with ICA (5 µM) were detected via ELISA. The results are shown in Fig. 8. The protein expression levels in VEGF and MMP-9 after ICA treatment were significantly decreased compared with those in the blank control group (p<0.01).

Discussion

Osteosarcoma is a clinically common malignant bone tumor occurring in young individuals, and its main clinical manifestations are progressively aggravated bone pain and local swelling (14,15). The 5-year survival rate of osteosarcoma patients is low, placing great economic and mental burdens on the society and family (16,17). The effective constituents in natural medicine and traditional Chinese medicine have been regarded as the ideal source of antitumor drugs with high efficiency and low toxicity. Previous studies have shown that herb Epimedium has a significant development potential for antitumor drugs. ICA is one of the most studied effective constituents in the studies of herb Epimedium. Li et al (18) studied and found that ICA can cause the death of lung cancer cells in vivo, which has an inhibitory effect on lung cancer cell migration and infiltration. Zhang et al (19) found that ICA can promote the proliferation and differentiation of osteoblasts, which may be realized via the BMP2/Smads/Runx2/Osterix signaling pathways. Hartemayer et al (20) studied and proved that the Wnt/β-catenin signaling pathway in chondrocytes can lead to hypertrophy and matrix mineralization of chondrocytes, induce the expressions of MMP-9 and VEGF and promote cell proliferation and migration. In addition, non-steroidal anti-inflammatory drugs can inhibit the proliferation of tumor cells by reducing β-catenin/TCF transcriptional activity and disturbing the signal transduction of the Wnt pathway (21).

In the present study, the effect of ICA on the proliferation of osteosarcoma cell 143B was investigated and it was found that the proliferation of 143B was significantly inhibited when the concentration of ICA reached 5 µM. At the same time, the flow cytometry showed that the cell apoptosis after ICA treatment was significantly increased. The aforementioned results indicated that ICA has a good inhibitory effect on the proliferation of osteosarcoma cells with a low onset concentration and high activity. The expression levels of related genes were detected via semi-quantitative PCR, and the results showed that the expression level of β-catenin was significantly decreased after ICA treatment, while the expression levels of its downstream genes c-Myc and cyclin D1 were also significantly decreased. Previous findings have shown that multiple ligands and receptors in the Wnt/β-catenin signaling pathway are highly expressed in osteosarcoma cells, suggesting that ICA may inhibit the proliferation of osteosarcoma cells by inhibiting the transcriptional level of β-catenin (22). Additionally, the protein expression levels in p-GSK3β and β-catenin were significantly decreased after ICA treatment. During typical Wnt/β-catenin signal transduction, the intracellular accumulation of β-catenin and its transfer to the nucleus were dominated in regulating the signal activity. GSK3β is an important negative regulator in the signal transduction process. Activation of GSK3β can promote the phosphorylation of β-catenin and eventually lead to the degradation of β-catenin and inactivation of the Wnt/β-catenin signal (23). ICA can increase the catalytic activity of GSK3β by inhibiting the phosphorylation of 9-serine of GSK3β, thus promoting β-catenin degradation and downregulating the protein level of β-catenin in cells. It was also found that the expression levels of downstream proteins of β-catenin, c-Myc and cyclin D1, were also inhibited. Therefore, it was inferred that ICA inhibits the Wnt/β-catenin signal and the expression of related target proteins in the pathway through inhibition of the phosphorylation of p-GSK3β, thus regulating the proliferation and invasion of osteosarcoma cells. At the same time, the expression level of caspase-3 in osteosarcoma cells after ICA treatment was increased, suggesting that ICA can also inhibit the proliferation of osteosarcoma cells by inhibiting their apoptosis.

In conclusion, ICA has a significant effect of inhibiting the proliferation and inducing the apoptosis of osteosarcoma cell 143B, which may be realized by activating GSK3β and inhibiting the activity of the Wnt/β-catenin signaling pathway. However, there were still some shortcomings in this experiment. The inhibitory effect of ICA on osteosarcoma cell proliferation and its mechanism were investigated only through in vitro experiments, and the abovementioned results were not verified in in vivo experiments. In the follow-up studies, the author aims to verify the efficacy of ICA and the role of Wnt/β-catenin signaling pathway from in vivo experiments again in the hope to provide new ideas for the efficacious development of ICA and the clinical treatment of osteosarcoma.

Competing interests

The authors declare that they have no competing interests.

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Spandidos Publications style
Ren Y, Zhu F and Liu Z: Inhibitory effect of icariin on osteosarcoma cell proliferation via the Wnt/β-catenin signaling pathway. Oncol Lett 16: 1405-1410, 2018.
APA
Ren, Y., Zhu, F., & Liu, Z. (2018). Inhibitory effect of icariin on osteosarcoma cell proliferation via the Wnt/β-catenin signaling pathway. Oncology Letters, 16, 1405-1410. https://doi.org/10.3892/ol.2018.8821
MLA
Ren, Y., Zhu, F., Liu, Z."Inhibitory effect of icariin on osteosarcoma cell proliferation via the Wnt/β-catenin signaling pathway". Oncology Letters 16.2 (2018): 1405-1410.
Chicago
Ren, Y., Zhu, F., Liu, Z."Inhibitory effect of icariin on osteosarcoma cell proliferation via the Wnt/β-catenin signaling pathway". Oncology Letters 16, no. 2 (2018): 1405-1410. https://doi.org/10.3892/ol.2018.8821