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PGC-1alpha expression decreases in the Alzheimer disease brain as a function of dementia.

Authors: Qin, W  Haroutunian, V  Katsel, P  Cardozo, CP  Ho, L  Buxbaum, JD  Pasinetti, GM 
Citation: Qin W, etal., Arch Neurol. 2009 Mar;66(3):352-61. doi: 10.1001/archneurol.2008.588.
Pubmed: (View Article at PubMed) PMID:19273754
DOI: Full-text: DOI:10.1001/archneurol.2008.588

OBJECTIVES: To explore mechanisms through which altered peroxisome proliferator-activated receptor gamma coactivator 1alpha (PGC-1alpha) expression may influence Alzheimer disease (AD) amyloid neuropathology and to test the hypothesis that promotion of PGC-1alpha expression in neurons might be developed as a novel therapeutic strategy in AD. DESIGN: Case-control. Patients Human postmortem brain (hippocampal formation) samples from AD cases and age-matched non-AD cases. RESULTS: Using genome-wide complementary DNA microarray analysis, we found that PGC-1alpha messenger RNA expression was significantly decreased as a function of progression of clinical dementia in the AD brain. Following confirmatory real-time polymerase chain reaction assay, we continued to explore the role of PGC-1alpha in clinical dementia and found that PGC-1alpha protein content was negatively associated with both AD-type neuritic plaque pathology and beta-amyloid (Abeta)(X-42) contents. Moreover, we found that the predicted elevation of amyloidogenic Abeta(1-42) and Abeta(1-40) peptide accumulation in embryonic cortico-hippocampal neurons derived from Tg2576 AD mice under hyperglycemic conditions (glucose level, 182-273 mg/dL) coincided with a dose-dependent attenuation in PGC-1alpha expression. Most importantly, we found that the reconstitution of exogenous PGC-1alpha expression in Tg2576 neurons attenuated the hyperglycemic-mediated beta-amyloidogenesis through mechanisms involving the promotion of the "nonamyloidogenic" alpha-secretase processing of amyloid precursor protein through the attenuation of the forkheadlike transcription factor 1 (FoxO3a) expression. CONCLUSION: Therapeutic preservation of neuronal PGC-1alpha expression promotes the nonamyloidogenic processing of amyloid precursor protein precluding the generation of amyloidogenic Abeta peptides.


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CRRD Object Information
CRRD ID: 7242017
Created: 2013-03-20
Species: All species
Last Modified: 2013-03-20
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.