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Arch Neurol. 2009 Mar;66(3):352-61. doi: 10.1001/archneurol.2008.588.

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

Author information

1
Department of Psychiatry, Mount Sinai School of Medicine, Bronx, NY, USA. weiping.qin@mssm.edu.

Abstract

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.

PMID:
19273754
PMCID:
PMC3052997
DOI:
10.1001/archneurol.2008.588
[Indexed for MEDLINE]
Free PMC Article

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