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Activating glucocorticoid receptor-ERK signaling pathway contributes to ginsenoside Rg1 protection against β-amyloid peptide-induced human endothelial cells apoptosis.
- Source :
-
Journal of Ethnopharmacology . May2013, Vol. 147 Issue 2, p456-466. 11p. - Publication Year :
- 2013
-
Abstract
- Abstract: The deposition of β-amyloid (Aβ) in neurons and vascular cells of the brain has been characterized in Alzheimer's disease. Ginsenoside Rg1 (Rg1) is an active components in Panax ginseng, a famous traditional Chinese medicines recorded in Compendium of Materia Medica. Present study attempted to evaluate the potential mechanisms of Aβ-mediated insult and the protective effects of Rg1 on human endothelial cells. Rg1 attenuated the Aβ25–35-associated mitochondrial apoptotic events, accompanied by inhibiting HIF-1α expression followed by intracellular reactive nitrogen species generation, and protein nitrotyrosination. These protective effects were abolished by glucocorticoid receptor (GR) antagonist RU486 or p-ERK inhibitor U0126 rather than estrogen receptor α antagonist ICI 82,780. Taken together, our results suggested that Rg1 protected against Aβ25–35-induced apoptosis at least in part by two complementary GR-dependent ERK phosphorylation pathways: (1) down-regulating HIF-1α initiated protein nitrotyrosination, and (2) inhibiting mitochondrial apoptotic cascades. These data provided a novel insight to the mechanisms of Rg1protective effects on Aβ25–35-induced endothelial cells apoptosis, suggesting that GR-ERK signaling pathway might play an important role in it. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03788741
- Volume :
- 147
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Ethnopharmacology
- Publication Type :
- Academic Journal
- Accession number :
- 104223527
- Full Text :
- https://doi.org/10.1016/j.jep.2013.03.039