Toona sinensis (leaf extracts) inhibit vascular endothelial growth factor (VEGF)-induced angiogenesis in vascular endothelial cells

You Cheng Hseu, Ssu Ching Chen, Wen Hsin Lin, Dong Zong Hung, Ming Kuem Lin, Yueh Hsiung Kuo, Mei Tsun Wang, Hsin Ju Cho, Lai Wang, Hsin Ling Yang

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55 Scopus citations

Abstract

Aim of the study: Toona sinensis is well known as a traditional Chinese medicine; also, it has been shown to exhibit anticancer and anti-inflammatory effects. This study was aimed at evaluating the anti-angiogenesis effect of the aqueous extracts of Toona sinensis (TS extracts) or gallic acid, a major component of TS extracts, against both VEGF-induced EA.hy 926 and human umbilical vein endothelial cells (HUVECs). Materials and methods: Anti-proliferative activity of TS extracts or gallic acid, was determined against EA.hy 926 and HUVECs by trypan blue exclusion method. Invasion, tube formation and chick chorioallantoic membrane assay were carried out to determine the in vitro and in vivo anti-angiogenic effects. Results: Non-cytotoxic concentration of TS extracts (50-100 μg/mL) and gallic acid (5 μg/mL) inhibited the proliferation of VEGF-stimulated EA.hy 926 and HUVECs. Inhibitory effects of TS extracts and gallic acid on angiogenesis were assessed by VEGF-induced migration/invasion and capillary-like tube formation by EA.hy 926 and HUVECs. Additionally, gelatin zymography assays showed that TS extracts and gallic acid suppressed the activity of metalloproteinase (MMP)-9 and MMP-2 activated by VEGF. In vivo, TS extracts and gallic acid strongly suppressed neovessel formation in the chorioallantoic membrane of chick embryos. Flow cytometry analyses and Western blot demonstrated that treatment with TS extracts and gallic acid induced G0/G1 arrest in VEGF-stimulated EA.hy 926 cells via a reduction in the amounts of cyclin D1, cyclin E, CDK4, hyperphosphorylated retinoblastoma protein (pRb), VEGFR-2, and eNOS. Conclusions: These results support an anti-angiogenic activity of Toona sinensis that may contribute critically to its cancer and inflammation chemopreventive potentials.

Original languageEnglish
Pages (from-to)111-121
Number of pages11
JournalJournal of Ethnopharmacology
Volume134
Issue number1
DOIs
StatePublished - 8 Mar 2011

Keywords

  • Angiogenesis
  • EA.hy 926 cells
  • Gallic acid
  • HUVECs
  • Toona sinensis
  • Traditional Chinese medicine

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