Document Detail


Ginkgo biloba extract ameliorates oxidative phosphorylation performance and rescues abeta-induced failure.
MedLine Citation:
PMID:  20808761     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Energy deficiency and mitochondrial failure have been recognized as a prominent, early event in Alzheimer's disease (AD). Recently, we demonstrated that chronic exposure to amyloid-beta (Abeta) in human neuroblastoma cells over-expressing human wild-type amyloid precursor protein (APP) resulted in (i) activity changes of complexes III and IV of the oxidative phosphorylation system (OXPHOS) and in (ii) a drop of ATP levels which may finally instigate loss of synapses and neuronal cell death in AD. Therefore, the aim of the present study was to investigate whether standardized Ginkgo biloba extract LI 1370 (GBE) is able to rescue Abeta-induced defects in energy metabolism.
METHODOLOGY/PRINCIPAL FINDINGS: We used a high-resolution respiratory protocol to evaluate OXPHOS respiratory capacity under physiological condition in control (stably transfected with the empty vector) and APP cells after treatment with GBE. In addition, oxygen consumption of isolated mitochondria, activities of mitochondrial respiratory enzymes, ATP and reactive oxygen species (ROS) levels as well as mitochondrial membrane mass and mitochondrial DNA content were determined. We observed a general antioxidant effect of GBE leading to an increase of the coupling state of mitochondria as well as energy homeostasis and a reduction of ROS levels in control cells and in APP cells. GBE effect on OXPHOS was even preserved in mitochondria after isolation from treated cells. Moreover, these functional data were paralleled by an up-regulation of mitochondrial DNA. Improvement of the OXPHOS efficiency was stronger in APP cells than in control cells. In APP cells, the GBE-induced amelioration of oxygen consumption most likely arose from the modulation and respective normalization of the Abeta-induced disturbance in the activity of mitochondrial complexes III and IV restoring impaired ATP levels possibly through decreasing Abeta and oxidative stress level.
CONCLUSIONS/SIGNIFICANCE: Although the underlying molecular mechanisms of the mode of action of GBE remain to be determined, our study clearly highlights the beneficial effect of GBE on the cellular OXPHOS performance and restoration of Abeta-induced mitochondrial dysfunction.
Authors:
Virginie Rhein; Maria Giese; Ginette Baysang; Fides Meier; Stefania Rao; Kathrin L Schulz; Matthias Hamburger; Anne Eckert
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-08-24
Journal Detail:
Title:  PloS one     Volume:  5     ISSN:  1932-6203     ISO Abbreviation:  PLoS ONE     Publication Date:  2010  
Date Detail:
Created Date:  2010-09-02     Completed Date:  2010-11-04     Revised Date:  2013-05-28    
Medline Journal Info:
Nlm Unique ID:  101285081     Medline TA:  PLoS One     Country:  United States    
Other Details:
Languages:  eng     Pagination:  e12359     Citation Subset:  IM    
Affiliation:
Neurobiology Laboratory for Brain Aging and Mental Health, Psychiatric University Clinics, University of Basel, Basel, Switzerland.
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MeSH Terms
Descriptor/Qualifier:
Adenosine Triphosphate / metabolism
Amyloid beta-Peptides / metabolism*,  secretion
Amyloid beta-Protein Precursor / metabolism
Cell Line, Tumor
DNA, Mitochondrial / genetics
Electron Transport / drug effects
Electron Transport Chain Complex Proteins / metabolism
Ginkgo biloba / chemistry*
Humans
Mitochondria / drug effects,  enzymology,  genetics,  metabolism
Oxidative Phosphorylation / drug effects*
Oxidative Stress / drug effects
Oxygen / metabolism
Plant Extracts / pharmacology*
Reactive Oxygen Species / metabolism
Up-Regulation / drug effects
Chemical
Reg. No./Substance:
0/Amyloid beta-Peptides; 0/Amyloid beta-Protein Precursor; 0/DNA, Mitochondrial; 0/Electron Transport Chain Complex Proteins; 0/LI 1370; 0/Plant Extracts; 0/Reactive Oxygen Species; 56-65-5/Adenosine Triphosphate; 7782-44-7/Oxygen
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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