title: Presenilin-1 mutation increases neuronal vulnerability to focal ischemia in vivo and to hypoxia and glucose deprivation in cell culture: involvement of perturbed calcium homeostasis.
abstract: Many cases of early-onset inherited Alzheimer's disease (AD) are caused by mutations in the presenilin-1 (PS1) gene. Studies of cultured neural cells suggest that PS1 mutations result in perturbed cellular calcium homeostasis and may thereby render neurons vulnerable to apoptosis. In light of evidence that metabolic impairment plays a role in AD, that cerebral ischemia may be a risk factor for AD, and that individuals with AD have increased morbidity and mortality after stroke, we examined the impact of a PS1 mutation on neuronal vulnerability to ischemic injury. We report that the extent of brain injury after focal cerebral ischemia reperfusion is increased, and behavioral outcome is worsened, in PS1 mutant knock-in mice compared to wild-type mice. Cultured cortical neurons from PS1 mutant mice exhibit increased vulnerability to glucose deprivation and chemical hypoxia compared to their wild-type counterparts. Calcium imaging studies demonstrated enhanced elevation of intracellular calcium levels after glucose deprivation and chemical hypoxia in neurons from PS1 mutant mice. Agents that block calcium release from IP(3)- and ryanodine-sensitive stores (xestospongin and dantrolene, respectively) protected against the endangering action of the PS1 mutation. Our data suggest that presenilin mutations may promote neuronal degeneration in AD by increasing the sensitivity of neurons to age-related ischemia-like conditions. The data further suggest that drugs that stabilize endoplasmic reticulum calcium homeostasis may prove effective in suppressing the neurodegenerative process in AD patients.
authors.affiliation: Sanders-Brown Research Center on Aging, Department of Anatomy, University of Kentucky, Lexington, Kentucky 40536, USA. mattsonm@grc.nia.nih.gov
authors.forename: M P
authors.initials: MP
authors.lastname: Mattson
authors.forename: H
authors.initials: H
authors.lastname: Zhu
authors.forename: J
authors.initials: J
authors.lastname: Yu
authors.forename: M S
authors.initials: MS
authors.lastname: Kindy
mesh_terms: D000544:Alzheimer Disease / Q000235:genetics; D000818:Animals; D017209:Apoptosis; D001794:Blood Pressure; D002118:Calcium / Q000378:metabolism; D002245:Carbon Dioxide / Q000097:blood; D015687:Cell Hypoxia; D002478:Cells, Cultured; D002560:Cerebrovascular Circulation; D003620:Dantrolene / Q000494:pharmacology; D004622:Embryo, Mammalian; D020022:Genetic Predisposition to Disease; D005947:Glucose / Q000502:physiology*; D006339:Heart Rate; D006706:Homeostasis; D007003:Hypoglycemia; D002546:Ischemic Attack, Transient / Q000235:genetics / Q000503:physiopathology*; D008565:Membrane Proteins / Q000172:deficiency / Q000235:genetics* / Q000502:physiology*; D051379:Mice; D018345:Mice, Knockout; D019579:Neocortex / Q000166:cytology / Q000502:physiology* / Q000503:physiopathology; D009474:Neurons / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D010100:Oxygen / Q000097:blood; D010313:Partial Pressure; D053764:Presenilin-1; D012966:Sodium Cyanide / Q000494:pharmacology
chemical_list: D008565:Membrane Proteins; D053764:Presenilin-1; D002245:Carbon Dioxide; D003620:Dantrolene; D005947:Glucose; D012966:Sodium Cyanide; D010100:Oxygen; D002118:Calcium