Post-translational remodeling of ryanodine receptor induces calcium leak leading to Alzheimer’s disease-like pathologies and cognitive deficits

Alain Lacampagne, Xiaoping Liu, Steven Reiken, Renaud Bussiere, Albano C. Meli, Inger Lauritzen, Andrew F. Teich, Ran Zalk, Nathalie Saint, Ottavio Arancio, Charlotte Bauer, Fabrice Duprat, Clark A. Briggs, Shreaya Chakroborty, Grace E. Stutzmann, Michael L. Shelanski, Frederic Checler, Mounia Chami, Andrew R. Marks

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

The mechanisms underlying ryanodine receptor (RyR) dysfunction associated with Alzheimer disease (AD) are still not well understood. Here, we show that neuronal RyR2 channels undergo post-translational remodeling (PKA phosphorylation, oxidation, and nitrosylation) in brains of AD patients, and in two murine models of AD (3 × Tg-AD, APP+/−/PS1+/−). RyR2 is depleted of calstabin2 (KFBP12.6) in the channel complex, resulting in endoplasmic reticular (ER) calcium (Ca2+) leak. RyR-mediated ER Ca2+ leak activates Ca2+-dependent signaling pathways, contributing to AD pathogenesis. Pharmacological (using a novel RyR stabilizing drug Rycal) or genetic rescue of the RyR2-mediated intracellular Ca2+ leak improved synaptic plasticity, normalized behavioral and cognitive functions and reduced Aβ load. Genetically altered mice with congenitally leaky RyR2 exhibited premature and severe defects in synaptic plasticity, behavior and cognitive function. These data provide a mechanism underlying leaky RyR2 channels, which could be considered as potential AD therapeutic targets.

Original languageEnglish
Pages (from-to)749-767
Number of pages19
JournalActa Neuropathologica
Volume134
Issue number5
DOIs
StatePublished - 1 Nov 2017
Externally publishedYes

Keywords

  • Amyloid beta
  • Calcium
  • Oxidative stress
  • PKA-dependent phosphorylation
  • Ryanodine receptor 2

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Clinical Neurology
  • Cellular and Molecular Neuroscience

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