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Article

Thymosin β4 promotes endothelial progenitor cell angiogenesis via a vascular endothelial growth factor‑dependent mechanism

  • Authors:
    • Yanbo Zhao
    • Jiale Song
    • Xukun Bi
    • Jing Gao
    • Zhida Shen
    • Junhui Zhu
    • Guosheng Fu
  • View Affiliations / Copyright

    Affiliations: Department of Cardiology, Biomedical Research (Therapy) Center, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310016, P.R. China
  • Pages: 2314-2320
    |
    Published online on: June 20, 2018
       https://doi.org/10.3892/mmr.2018.9199
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Abstract

Endothelial progenitor cells (EPCs) are a promising cell source for tissue repair and regeneration, predominantly through angiogenesis promotion. Paracrine functions serve a pivotal role in EPC‑mediated angiogenesis, which may be impaired by various cardiovascular risk factors. Therefore, it is important to identify a solution that optimizes the paracrine function of EPCs. Thymosin β4 (Tβ4) is a peptide with the potential to promote tissue regeneration and wound healing. A previous study demonstrated that Tβ4 enhances the EPC‑mediated angiogenesis of the ischemic myocardium. In the present study, whether Tβ4 improved angiogenesis by enhancing the paracrine effects of EPCs was investigated. A tube formation assay was used to assess the effect of angiogenesis, and the paracrine effects were measured using an ELISA kit. The results indicated that Tβ4 improved the paracrine effects of EPCs, evidenced by an increase in the expression of vascular endothelial growth factor (VEGF). EPC‑conditioned medium (EPC‑CM) significantly promoted human umbilical vein endothelial cell angiogenesis in vitro, which was further enhanced by pretreatment with Tβ4. The effect of Tβ4 pretreated EPC‑CM on angiogenesis was abolished by VEGF neutralizing antibody in vitro, indicating that increased VEGF secretion had a pivotal role in Tβ4‑mediated EPC angiogenesis. Furthermore, transplantation of EPCs pretreated with Tβ4 into infarcted rat hearts resulted in significantly higher VEGF expression in the border zone, compared with EPC transplantation alone. To further investigate whether the Akt/eNOS pathway was involved in Tβ4‑induced VEGF secretion in EPCs, the expression levels of VEGF in EPC‑CM were significantly decreased following knockdown of Akt or eNOS by small interfering RNA transfection. In conclusion, Tβ4 significantly increased angiogenesis by enhancing the paracrine effects of EPCs, evidenced by the increased expression of VEGF. The RAC‑α serine/threonine‑protein kinase/endothelial nitric oxide synthase signal transduction pathway was involved in the regulation of Tβ4‑induced VEGF secretion in EPCs. Further studies are required to investigate the long‑term prognosis of patients with coronary heart disease following Tβ4‑pretreated EPC transplantation.
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Copy and paste a formatted citation
Spandidos Publications style
Zhao Y, Song J, Bi X, Gao J, Shen Z, Zhu J and Fu G: Thymosin β4 promotes endothelial progenitor cell angiogenesis via a vascular endothelial growth factor‑dependent mechanism. Mol Med Rep 18: 2314-2320, 2018.
APA
Zhao, Y., Song, J., Bi, X., Gao, J., Shen, Z., Zhu, J., & Fu, G. (2018). Thymosin β4 promotes endothelial progenitor cell angiogenesis via a vascular endothelial growth factor‑dependent mechanism. Molecular Medicine Reports, 18, 2314-2320. https://doi.org/10.3892/mmr.2018.9199
MLA
Zhao, Y., Song, J., Bi, X., Gao, J., Shen, Z., Zhu, J., Fu, G."Thymosin β4 promotes endothelial progenitor cell angiogenesis via a vascular endothelial growth factor‑dependent mechanism". Molecular Medicine Reports 18.2 (2018): 2314-2320.
Chicago
Zhao, Y., Song, J., Bi, X., Gao, J., Shen, Z., Zhu, J., Fu, G."Thymosin β4 promotes endothelial progenitor cell angiogenesis via a vascular endothelial growth factor‑dependent mechanism". Molecular Medicine Reports 18, no. 2 (2018): 2314-2320. https://doi.org/10.3892/mmr.2018.9199
Copy and paste a formatted citation
x
Spandidos Publications style
Zhao Y, Song J, Bi X, Gao J, Shen Z, Zhu J and Fu G: Thymosin β4 promotes endothelial progenitor cell angiogenesis via a vascular endothelial growth factor‑dependent mechanism. Mol Med Rep 18: 2314-2320, 2018.
APA
Zhao, Y., Song, J., Bi, X., Gao, J., Shen, Z., Zhu, J., & Fu, G. (2018). Thymosin β4 promotes endothelial progenitor cell angiogenesis via a vascular endothelial growth factor‑dependent mechanism. Molecular Medicine Reports, 18, 2314-2320. https://doi.org/10.3892/mmr.2018.9199
MLA
Zhao, Y., Song, J., Bi, X., Gao, J., Shen, Z., Zhu, J., Fu, G."Thymosin β4 promotes endothelial progenitor cell angiogenesis via a vascular endothelial growth factor‑dependent mechanism". Molecular Medicine Reports 18.2 (2018): 2314-2320.
Chicago
Zhao, Y., Song, J., Bi, X., Gao, J., Shen, Z., Zhu, J., Fu, G."Thymosin β4 promotes endothelial progenitor cell angiogenesis via a vascular endothelial growth factor‑dependent mechanism". Molecular Medicine Reports 18, no. 2 (2018): 2314-2320. https://doi.org/10.3892/mmr.2018.9199
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