Aurora kinase inhibitor VX‑680 suppresses the proliferation and migration of HUVECs and angiogenesis

  • Authors:
    • Xuejiao Sun
    • Shishi Niu
    • Zhen Zhang
    • Anyan Wang
    • Chengyuan Yang
    • Zichan Guo
    • Yuepeng Hao
    • Xiaozhong Li
    • Xiaoxia Wang
  • View Affiliations

  • Published online on: February 27, 2019     https://doi.org/10.3892/mmr.2019.9996
  • Pages: 3841-3847
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Abstract

Angiogenesis serves a key role in tumor growth and metastasis. VX‑680, a potent inhibitor targeting the Aurora kinase family, is widely used in the inhibition of tumor progression. However, the effect of VX‑680 on angiogenesis remains unknown. The present study identified that VX‑680 inhibited human umbilical vein endothelial cell (HUVEC) proliferation and promoted HUVEC apoptosis by inducing the cleavage of PARP and caspase‑3. VX‑680 also markedly decreased the migration and tube formation of HUVECs in a dose‑dependent manner. In addition, VX‑680 significantly suppressed the formation of blood vessels in a dose‑dependent manner confirmed by a chicken embryo chorioallantoic membrane assay in vivo. Furthermore, VX‑680 inhibited the expression levels of vascular endothelial growth factor and phosphorylated RAC‑α serine/threonine‑protein kinase in HUVECs. These results suggested that VX‑680 suppressed angiogenesis and may be a potential novel anti‑angiogenic agent.

Introduction

Angiogenesis refers to the formation of new capillaries on the existing blood vessels that provide oxygen and nutrients to the various tissues and organs of the body (1,2), which involves a number of steps, including endothelial cell proliferation, migration, and endothelial cells forming blood vessels with a tubular structure (3). Even a tumor tissue of only 2–3 mm3 requires a constant blood and nutrient supply (2). Moreover, tumor angiogenesis enables tumor cells to depart from the primary tumor site and enter the circulation, facilitating tumor metastasis (4). Therefore, suppression of tumor angiogenesis has been a promising approach in the prevention of tumor growth and metastasis.

VX-680 is a potent inhibitor that targets the Aurora kinase family (Aurora-A, Aurora-B and Aurora-C) by binding to the ATP site of the kinase domain (57). It has been reported that VX-680 is able to inhibit cell proliferation and induce cellular apoptosis in various cancer types, including ovarian cancer, cervical cancer, renal cell carcinoma and acute promyelocytic leukemia (812). Moreover, VX-680 has been confirmed to be a promising, specific therapeutic tool for eradicating metastases (13). VX-680 also enhances chemosensitivity to cisplatin and Taxol (14,15). Therefore, VX-680 may represent a novel approach to the treatment of cancer. However, its role in angiogenesis remains unknown.

The present study evaluated the effects of VX-680 on angiogenesis by examining endothelial cell function in vitro and the formation of blood vessels in chicken embryo chorioallantoic membranes (CAMs) in vivo. The results indicated that VX-680 may be used as an anti-angiogenic agent.

Materials and methods

Regents

VX-680 was purchased from BioVision, Inc. (Milpitas, CA, USA). RPMI-1640 and fetal bovine serum (FBS) were purchased from HyClone (GE Healthcare Life Sciences, Logan, UT, USA). DAPI was purchased from Beijing Solarbio Science & Technology Co., Ltd. (Beijing, China). Matrigel was purchased from Corning, Inc. (Corning, NY, USA). Mouse anti-poly [ADP-ribose] polymerase (PARP; cat. no. 551024; 1:1,000) antibody was obtained from BD Biosciences (San Jose, CA, USA). Mouse anti-procaspase-3 (cat. no. sc-271759; 1:1,000) antibody, mouse anti-vascular endothelial growth factor A (VEGFA; cat. no. sc-7269; 1:1,000) antibody and mouse anti-β-actin (cat. no. sc-8432; 1:1,500) antibody were obtained from Santa Cruz Biotechnology, Inc. (Dallas, TX, USA). Rabbit anti-RAC-α serine/threonine-protein kinase (AKT; cat. no. 9272; 1:1,000) antibody and rabbit anti-phosphorylated (p)-AKT (cat. no. 9271; 1:1,000) antibody were obtained from Cell Signaling Technology, Inc. (Danvers, MA, USA).

Cell culture

HUVECs (human umbilical vein endothelial cells) were purchased from Jiangyin Qi Biotechnology Co., Ltd. (Hai'an, China) and cultured in RPMI-1640 supplemented with 10% FBS under standard culture conditions (37°C with 5% CO2).

Cell viability assay

Cell viability was assessed by MTT assay. HUVECs (1×104 cells/well) were cultured in 96-well plates and treated for 24, 48, 72 and 96 h with VX-680 (0, 1.5 and 2.25 µM). Subsequently, 50 µl MTT (5 mg/ml) was added into each plate and incubated for a further 4 h. A volume of 150 µl dimethyl sulfoxide was added to solubilize the formazan. The absorbance was measured at 490 nm using a microplate reader.

Colony formation assay

HUVECs were plated in 60 mm cell culture dishes (2×103 cells/dish) and treated with VX-680 (0, 1.5 and 2.25 µM) for 24 h. The medium was refreshed, and the cells were cultured for another 14 days. HUVECs were stained with 0.1% crystal violet for 15 min at room temperature after fixing with 70% methanol for 10 min at room temperature. The colonies were photographed and manually counted using a Universal Hood II Molecular Imager Gel System (Bio-Rad Laboratories, Inc., Hercules, CA, USA) and an inverted microscope (magnification, ×40).

Apoptosis assay

HUVECs (2×105 cells/well) were seeded in 60 mm culture dishes and incubated with VX-680 (0, 1.5 and 2.25 µM) for 24 h. The cells were fixed with methanol for 20 min at room temperature and stained with 0.1% DAPI for 15 min at room temperature. The cells were photographed using a fluorescence microscope (magnification, ×200).

Western blot analysis

HUVECs were cultured in 60 mm cell culture dishes and treated with VX-680 (0, 1.5 and 2.25 µM) for 24 h, and the total protein was extracted using Radioimmunoprecipitation Assay lysis buffer (cat. no. P0013B; Beyotime Institute of Biotechnology, Haimen, China). The proteins in the cell lysates were quantified using the Bradford method. The cell lysates were mixed with sample buffer and boiled for 5 min. The proteins (80 µg/lane) were separated by 10% SDS-PAGE and subsequently transferred to nitrocellulose (NC) membranes. The NC membranes were blocked with 5% skimmed milk at room temperature for 60 min. The membranes were subsequently incubated with the aforementioned primary antibodies overnight at 4°C, followed by incubation with horseradish-peroxidase-conjugated secondary antibodies [cat. nos. W401B and W402B; 1:3,000; Promega (Beijing) Biotech Co., Ltd. Beijing, China] for 60 min at room temperature. The protein bands were observed using enhanced chemiluminescence reagent (cat. no. 29050; Engreen Biosystem Co., Ltd., Beijing, China) and the band intensities were measured using ImageJ software (version 1.48; National Institutes of Health, Bethesda, MD, USA).

Wound healing assay

HUVECs were incubated to complete confluence, scratched using pipette tips and washed three times with PBS. HUVECs were treated with VX-680 (0, 1.5 and 2.25 µM) for 24 h, and images were captured under a light microscope (magnification, ×100) at 0 and 24 h. Cell migration ability was analyzed using Image-Pro Plus (version 6.0; Media Cybernetics, Rockville, MD, USA).

Tube formation assay

Matrigel (50 µl/well) was added to 96-well plates and incubated at 37°C for 40 min. HUVECs were treated with VX-680 (0, 1.5 and 2.25 µM) for 24 h. The cell density was adjusted to 2.5×104 cells/well, and the cells were cultured in pre-coated 96-well plates for 3 h. HUVECs were photographed using an inverted microscope (magnification, ×40). Results were quantified by measuring the tube length.

Chicken embryo CAM assay

A 1 cm diameter window was opened in the shell of each egg (n=9) containing 7-day-old chicken embryo to expose the chicken embryo CAM. Disinfected filter papers were added to the CAM, which were steeped in VX-680 (0, 1.5 and 2.25 µM). After 48 h, chicken embryos were fixed for 15 min with stationary solution (methanol: acetone 1:1) at room temperature. CAMs were harvested and images were captured using a Universal Hood II Molecular Imager Gel System (Bio-Rad Laboratories, Inc.). The number of blood vessels was manually counted in each image.

Statistical analysis

Data were analyzed statistically using SPSS 16.0 software (SPSS, Inc., Chicago, IL, USA). The results are expressed as the mean ± standard deviation from three independent experiments. The differences between groups were assessed by one-way analysis of variance followed by Dunnett's multiple comparison post hoc test. P<0.05 was considered to indicate a statistically significant difference.

Results

VX-680 reduces HUVEC viability

The present study examined the effect of VX-680 on HUVEC proliferation by MTT analysis. As presented in Fig. 1A, VX-680 significantly inhibited HUVEC viability in a dose- and time-dependent manner. To further assess the anti-proliferative ability of VX-680 on HUVECs, a colony formation assay was performed. As presented in Fig. 1B and C, VX-680 reduced colony size and number in comparison with control cells. The data indicated that VX-680 suppresses HUVEC viability.

VX-680 induces HUVEC apoptosis

To determine whether apoptosis contributes to the growth inhibition mediated by VX-680, morphological alterations in the cell nuclei were examined by DAPI staining in HUVECs. The results revealed that HUVECs exhibited nuclear fragmentation and condensation following treatment with VX-680, which are morphological features of apoptosis (Fig. 2A). The rates of apoptosis in VX-680-treated cells (31.11 and 64.32%) were higher compared with those in control cells (11.94%; Fig. 2B). Consistent with the results of the DAPI staining, VX-680 resulted in evident PARP cleavage, whereas PARP cleavage was weaker in control cells. Furthermore, the procaspase-3 in VX-680-treated cells was significantly decreased compared with that observed in control cells (Fig. 2C and D), indicating cleavage of caspase-3 in cells following VX-680 treatment, although the cleaved fragment of caspase-3 was not detected. The results suggested that VX-680 promoted the apoptosis of HUVECs by inducing the cleavage of PARP and caspase-3.

VX-680 inhibits HUVEC migration

Endothelial cell migration is a critical step in angiogenesis (3,4). To examine whether VX-680 regulated the migratory characteristics of endothelial cells, a wound healing assay was performed. As hypothesized, the results demonstrated that a significant reduction in the migration of HUVECs was observed when cells were treated with VX-680 compared with the control cells (Fig. 3). The results demonstrated that VX-680 significantly inhibited the migratory ability of HUVECs.

VX-680 suppresses angiogenesis in vitro and in vivo

To evaluate the anti-angiogenic ability of VX-680, a HUVEC tube formation assay was conducted in vitro in addition to a chicken embryo CAM assay in vivo. As presented in Fig. 4A, HUVECs were seeded on Matrigel and formed robust capillary-like structures in the control group after 3 h. By contrast, the tube formation on Matrigel of HUVECs pre-treated with VX-680 for 24 h was decreased. Approximately 13.39 and 65.4% destruction of the tube network was observed when HUVECs were treated with VX-680 at 1.5 and 2.25 µM, respectively (Fig. 4B). Similarly, the control group exhibited formation of new capillaries and branches in the CAM, whereas VX-680 inhibited angiogenesis. Quantitative analysis revealed that 1.5 and 2.25 µM VX-680 caused a 1.5- and 2.5-fold reduction in the number of blood vessels, respectively (Fig. 4C and D). These findings suggested that VX-680 suppressed angiogenesis in vitro and in vivo.

VX-680 downregulates VEGFA expression and the AKT signaling pathway

VEGFA, as a crucial angiogenic factor, promotes the proliferation and migration of endothelial cells and stimulates the differentiation of endothelial cells into capillaries (16,17). Therefore, the present study investigated the effects of VX-680 on VEGFA protein expression by western blot analysis. The data demonstrated that VX-680 significantly decreased the expression of VEGFA in a concentration-dependent manner compared with the control (Fig. 5A). In addition, AKT serves a crucial role in regulating a series of endothelial cell functions, including cell proliferation and migration (3,18). The results demonstrated that VX-680 led to a decrease in p-AKT expression in a dose-dependent manner. However, the total expression of AKT was almost unaffected (Fig. 5B). These data suggested that the suppression of angiogenesis by VX-680 may be mediated in part by the downregulation of VEGFA expression and AKT signaling in HUVECs; further studies are required to test this hypothesis.

Discussion

The majority of cancer mortality is due to tumor metastasis, and angiogenesis serves a pivotal role in tumor proliferation and metastasis (1620). Thus, there is an urgent need to develop effective anti-angiogenic agents for the treatment of cancer. The Aurora serine/threonine kinase family, including Aurora kinases A, B, and C, is critical in regulating mitotic processes. A number of studies have demonstrated that aberrant Aurora kinase activity and expression have been observed in numerous human cancer types (2123). Therefore, Aurora kinase family members may serve as potential molecular targets of anti-tumor therapy. VX-680, as an Aurora kinase inhibitor, is able to inhibit cell proliferation and metastasis, and induce apoptosis in tumor cells by blocking the ATP-binding site of the serine/threonine kinase (815,24). However, the potential effect of VX-680 on angiogenesis remains poorly understood.

Endothelial cell proliferation and apoptosis serve critical roles in the process of angiogenesis (4,16,17). In the present study, it was observed that VX-680 effectively inhibited HUVEC proliferation in a time- and dose-dependent manner. DAPI staining and analysis of the cleavage of PARP and caspase-3 indicated that VX-680 promoted HUVEC apoptosis. Endothelial cell migration also serves a key role in angiogenesis (3,4). According to the wound healing assay, it was demonstrated that VX-680 significantly inhibited the migratory ability of HUVECs. In addition, a tube formation assay was performed to analyze the anti-angiogenic effect of VX-680, which is a well-known angiogenesis experiment in vitro (25). The results indicated that VX-680 significantly reduced the formation of capillary-like structures. Furthermore, the chicken embryo CAM assay in vivo was used to test the anti-angiogenic effect of VX-680. The results displayed that VX-680 significantly inhibited the formation of blood vessels in a dose-dependent manner. These results illustrated that VX-680 inhibited angiogenesis in vitro and in vivo.

The role of VEGFA in angiogenesis is essential. VEGFA is overexpressed in the majority of types of cancer and is involved in most of the stages of tumor angiogenesis (16,17,26). Studies have demonstrated that anti-angiogenic drugs principally target VEGFA and the associated signaling pathways (4,16,17,27). The present results demonstrated that VX-680 significantly decreased the expression of VEGFA. AKT is a type of serine/threonine protein kinase and serves an important role in cell proliferation and migration (27,28). The activation of the AKT signaling pathway can stimulate angiogenesis (18,20). The present study identified that the phosphorylation of AKT was inhibited by VX-680 while the total expression of AKT was unaltered. The above results further demonstrated that VX-680 serves an anti-angiogenic role.

In conclusion, the results of the present study indicated that VX-680 exerted effective anti-angiogenic activity, and VX-680 may be a new anti-angiogenic drug for cancer therapy.

Acknowledgements

Not applicable.

Funding

The present study was supported by grants from the National Natural Science Foundation of China (grant no. 81372676) and Natural Science Foundation of Shanxi Province (grant no. 201601D011130).

Availability of data and materials

All data generated or analyzed during this study are included in this published article.

Authors' contributions

XS, SN and ZZ performed the experiments, and analyzed and interpreted the data. AW, CY, ZG and YH were involved in collecting the data. XS, XL and XW designed the study and were responsible for writing the manuscript. All authors read and approved the manuscript.

Ethics approval and consent to participate

Not applicable.

Patient consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Spandidos Publications style
Sun X, Niu S, Zhang Z, Wang A, Yang C, Guo Z, Hao Y, Li X and Wang X: Aurora kinase inhibitor VX‑680 suppresses the proliferation and migration of HUVECs and angiogenesis . Mol Med Rep 19: 3841-3847, 2019
APA
Sun, X., Niu, S., Zhang, Z., Wang, A., Yang, C., Guo, Z. ... Wang, X. (2019). Aurora kinase inhibitor VX‑680 suppresses the proliferation and migration of HUVECs and angiogenesis . Molecular Medicine Reports, 19, 3841-3847. https://doi.org/10.3892/mmr.2019.9996
MLA
Sun, X., Niu, S., Zhang, Z., Wang, A., Yang, C., Guo, Z., Hao, Y., Li, X., Wang, X."Aurora kinase inhibitor VX‑680 suppresses the proliferation and migration of HUVECs and angiogenesis ". Molecular Medicine Reports 19.5 (2019): 3841-3847.
Chicago
Sun, X., Niu, S., Zhang, Z., Wang, A., Yang, C., Guo, Z., Hao, Y., Li, X., Wang, X."Aurora kinase inhibitor VX‑680 suppresses the proliferation and migration of HUVECs and angiogenesis ". Molecular Medicine Reports 19, no. 5 (2019): 3841-3847. https://doi.org/10.3892/mmr.2019.9996