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J. Biol. Chem., Vol. 275, Issue 24, 18195-18200, June 16, 2000
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§¶,
,
,
, and
§**
From the Many cases of early-onset inherited Alzheimer's
disease (AD) are caused by mutations in the presenilin-1 (PS1) gene.
PS1 mutations may perturb cellular Ca2+ homeostasis
and thereby render neurons vulnerable to excitotoxicity and apoptosis.
We now report that PC12 cells expressing PS1 mutations and primary
hippocampal neurons from PS1 mutant knockin mice exhibit greatly
increased levels of ryanodine receptors (RyR) and enhanced Ca2+ release following stimulation with caffeine.
Double-labeling immunostaining and co-immunoprecipitation analyses
indicate that PS1 and RyR are colocalized and interact physically.
Caffeine treatment sensitizes neurons expressing mutant PS1 to
apoptosis induced by amyloid
Sanders-Brown Research Center on
Aging, University of Kentucky, Lexington, Kentucky 40536, the
§ Laboratory of Neurosciences, NIA, National Institutes of
Health, Baltimore, Maryland 21224, and the
Department of
Pharmacology and Therapeutics, University of Manitoba Faculty of
Medicine, Winnipeg, Manitoba, Canada
-peptide, a neurotic peptide linked to
the pathogenesis of AD. When taken together with recent evidence for alterations in RyR in brains of AD patients, our data suggest that PS1
mutations may promote neuronal degeneration in AD by increasing
transcription and translation of RyR and altering functional properties
of ryanodine-sensitive Ca2+ pools.
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