Vanillin derivative VND3207 activates DNA-PKcs conferring protection against radiation-induced intestinal epithelial cells injury in vitro and in vivo

Ming Li, Yue Lang, Meng Meng Gu, Jianming Shi, Benjamin P.C. Chen, Lan Yu, Ping Kun Zhou, Zeng Fu Shang

Research output: Contribution to journalArticle

Abstract

Vanillin is a natural compound endowed with antioxidant and anti-mutagenic properties. We previously identified the vanillin derivative VND3207 with strong radio-protective and antioxidant effects and found that VND3207 confers survival benefit and protection against radiation-induced intestinal injury (RIII) in mice. We also observed that VND3207 treatment enhanced the expression level of the catalytic subunit of the DNA-dependent protein kinase (DNA-PKcs) in human lymphoblastoid cells with or without γ-irradiation. DNA-PKcs is a critical component of DNA double strand break repair pathway and also regulates mitotic progression by stabilizing spindle formation and preventing mitotic catastrophe in response to DNA damage. In the present study, we found that VND3207 protected intestinal epithelial cells in vitro against ionizing radiation by promoting cell proliferation and inhibiting cell apoptosis. In addition, VND3207 promoted DNA-PKcs activity by increasing autophosphorylation at S2056 site. Consistent with this, VND3207 significantly decreased the number of γH2AX foci and mitotic catastrophe after radiation. DNA-PKcs deficiency abolished these VND3207 radio-protective effects, indicating that DNA-PKcs activation is essential for VND3207 activity. In conclusion, VND3207 promoted intestinal repair following radiation injury by regulating the DNA-PKcs pathway.

Original languageEnglish (US)
Article number114855
JournalToxicology and Applied Pharmacology
Volume387
DOIs
StatePublished - Jan 15 2020

Keywords

  • DNA damage
  • DNA-PKcs
  • Mitotic catastrophe
  • Radiation-induced intestinal injuries
  • VND3207

ASJC Scopus subject areas

  • Toxicology
  • Pharmacology

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