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Honokiol Inhibits Vascular Vessel Formation of Mouse Embryonic Stem Cell-Derived Endothelial Cells via the Suppression of PECAM and MAPK/mTOR Signaling Pathway

Honokiol Inhibits Vascular Vessel Formation of Mouse Embryonic Stem Cell-Derived Endothelial... Embryonic stem cells, which are characterized by pluripotency and self-renewal, have recently been highlighted in drug discovery. In particular, the potential of ES cells to differentiate into specific-cell types make them an extremely useful tool in the evaluation of the biological activity of test compounds. Honokiol, a major neolignan derived from the bark of Magnolia obovata, has been shown an anti-tumor activity. However, the precise mechanism of action in the anti-tumor activity of honokiol is still poorly understood. Here, we evaluated the antiangiogenic activity of honokiol using mouse ES cell-derived embryoid bodies. mES-derived EBs were formed using hanging drop cultures and vascular formation was induced on gelatincoated plates in EGM-2 medium. The growth inhibition of honokiol was found to be more sensitive in the differentiated EB-derived endothelial cells compared to the undifferentiated EB-derived cells. Honokiol also inhibited the vascular formation of mES cells on 3-D collagen gel and decreased the expression of endothelial biomarkers VEGFR2 and PECAM in the differentiated EB-derived endothelial cells. In addition, honokiol suppressed the MAPK and mTOR signaling pathways in the EB-derived endothelial cells. Therefore, the anti-angiogenic activity of honokiol is associated in part with the suppression of PECAM and MAPK/mTOR pathways in EB-derived endothelial cells. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Cellular Physiology and Biochemistry Karger

Honokiol Inhibits Vascular Vessel Formation of Mouse Embryonic Stem Cell-Derived Endothelial Cells via the Suppression of PECAM and MAPK/mTOR Signaling Pathway

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References (48)

Publisher
Karger
Copyright
© 2012 S. Karger AG, Basel
ISSN
1015-8987
eISSN
1421-9778
DOI
10.1159/000341455
Publisher site
See Article on Publisher Site

Abstract

Embryonic stem cells, which are characterized by pluripotency and self-renewal, have recently been highlighted in drug discovery. In particular, the potential of ES cells to differentiate into specific-cell types make them an extremely useful tool in the evaluation of the biological activity of test compounds. Honokiol, a major neolignan derived from the bark of Magnolia obovata, has been shown an anti-tumor activity. However, the precise mechanism of action in the anti-tumor activity of honokiol is still poorly understood. Here, we evaluated the antiangiogenic activity of honokiol using mouse ES cell-derived embryoid bodies. mES-derived EBs were formed using hanging drop cultures and vascular formation was induced on gelatincoated plates in EGM-2 medium. The growth inhibition of honokiol was found to be more sensitive in the differentiated EB-derived endothelial cells compared to the undifferentiated EB-derived cells. Honokiol also inhibited the vascular formation of mES cells on 3-D collagen gel and decreased the expression of endothelial biomarkers VEGFR2 and PECAM in the differentiated EB-derived endothelial cells. In addition, honokiol suppressed the MAPK and mTOR signaling pathways in the EB-derived endothelial cells. Therefore, the anti-angiogenic activity of honokiol is associated in part with the suppression of PECAM and MAPK/mTOR pathways in EB-derived endothelial cells.

Journal

Cellular Physiology and BiochemistryKarger

Published: Jan 1, 2012

Keywords: Honokiol; Anti-angiogenesis; PECAM; Differentiation; MAPK; mTOR; Mouse embryonic stem cells

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