Open Access

p53 mediates PEDF‑induced autophagy in human umbilical vein endothelial cells through sestrin2 signaling

  • Authors:
    • Tiangui Chen
    • Tianbo Li
    • Jiangning Wang
  • View Affiliations

  • Published online on: June 3, 2019     https://doi.org/10.3892/mmr.2019.10319
  • Pages: 1443-1450
  • Copyright: © Chen et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

Metrics: Total Views: 0 (Spandidos Publications: | PMC Statistics: )
Total PDF Downloads: 0 (Spandidos Publications: | PMC Statistics: )


Abstract

Autophagy is a conserved catabolic process by which cytoplasmic components are delivered into lysosomes for degradation. Pigment epithelium‑derived factor (PEDF) has been reported to be associated with autophagy and can induce p53 expression; however, the mechanism relating PEDF with autophagy in endothelial cells remains poorly understood. The present study aimed to investigate the association between the PEDF‑p53‑sestrin pathway and autophagy in human umbilical vein endothelial cells (HUVECs). PEDF‑induced autophagy was examined by fluorescence microscopy and western blot analysis. p53 small interfering (si)RNA and sestrin2 siRNA were constructed and transfected into HUVECs prior to PEDF treatment. The protein expression levels of microtubule‑associated protein light chain 3 (LC3) I, LC3 II and p62 were evaluated by western blot analysis, and the mRNA expression levels of p53 and sestrin2 were determined using reverse transcription‑quantitative polymerase chain reaction analysis. The regulation of mechanistic target of rapamycin (mTOR) was reflected by p70S6 kinase (p70S6K) and eukaryotic translation initiation factor 4E‑binding protein 1 (4E‑BP1) protein expression levels, as determined by western blot analysis. PEDF could induce HUVEC autophagy by sequentially inducing p53 and sestrin2 expression, as observed by fluorescence microscopy and western blot analysis. Conversely, the induction of sestrin2 by PEDF was eliminated by p53 siRNA. In addition, p53 siRNA and sestrin2 siRNA could attenuate PEDF‑induced HUVEC autophagy. Inhibition of mTOR may be the mechanism responsible for PEDF‑induced autophagy; as p70S6K and 4E‑BP1 phosphorylation levels were significantly upregulated in p53 siRNA‑treated and sestrin2 siRNA‑treated groups. The findings of the present study indicated that PEDF may trigger autophagy in HUVECs by inducing p53 and sestrin2 expression, and inhibiting mTOR expression; these findings may contribute to the improved understanding of diseases, including cancer and atherosclerosis.
View Figures
View References

Related Articles

Journal Cover

August-2019
Volume 20 Issue 2

Print ISSN: 1791-2997
Online ISSN:1791-3004

Sign up for eToc alerts

Recommend to Library

Copy and paste a formatted citation
x
Spandidos Publications style
Chen T, Li T and Wang J: p53 mediates PEDF‑induced autophagy in human umbilical vein endothelial cells through sestrin2 signaling. Mol Med Rep 20: 1443-1450, 2019
APA
Chen, T., Li, T., & Wang, J. (2019). p53 mediates PEDF‑induced autophagy in human umbilical vein endothelial cells through sestrin2 signaling. Molecular Medicine Reports, 20, 1443-1450. https://doi.org/10.3892/mmr.2019.10319
MLA
Chen, T., Li, T., Wang, J."p53 mediates PEDF‑induced autophagy in human umbilical vein endothelial cells through sestrin2 signaling". Molecular Medicine Reports 20.2 (2019): 1443-1450.
Chicago
Chen, T., Li, T., Wang, J."p53 mediates PEDF‑induced autophagy in human umbilical vein endothelial cells through sestrin2 signaling". Molecular Medicine Reports 20, no. 2 (2019): 1443-1450. https://doi.org/10.3892/mmr.2019.10319