TY - JOUR
T1 - Up-regulation of the type 3 ryanodine receptor is neuroprotective in the TgCRND8 mouse model of Alzheimer's disease
AU - Supnet, Charlene
AU - Noonan, Charmaine
AU - Richard, Kelly
AU - Bradley, John
AU - Mayne, Michael
N1 - Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010/1
Y1 - 2010/1
N2 - The cellular pathology of Alzheimer's disease is progressive and protracted leading eventually to considerable neuronal death. The underlying mechanisms of the pathology are complex but changes in the control of intracellular Ca 2+ are believed to contribute to the demise of neurons. In this study, we investigated the functional consequences of an increase in the expression of the type 3 isoform of the ryanodine receptor (RyR3). We found that although cortical neurons from TgCRND8 mice secreted significantly more amyloid beta protein and showed significantly increased RyR3 expression, they were no more sensitive to cell stress than non-transgenic neurons. Furthermore, despite increased intracellular Ca2+ release in response to ryanodine, we found that basal Ca2+, K+-evoked Ca2+ responses, and capacitative Ca2+ entry were no different in TgCRND8 neurons compared with non-transgenic neurons. Therefore, as RyR3 up-regulation did not affect neuronal health or global Ca2+ homeostasis, we investigated the effect of reducing RyR3 expression using small interfering RNA. Surprisingly, a reduction of RyR3 expression in TgCRND8, but not in non-transgenic, neurons increased neuronal death. These data reveal a new role for RyR3 and indicate a novel potential therapeutic target to delay or prevent the progression of Alzheimer's disease.
AB - The cellular pathology of Alzheimer's disease is progressive and protracted leading eventually to considerable neuronal death. The underlying mechanisms of the pathology are complex but changes in the control of intracellular Ca 2+ are believed to contribute to the demise of neurons. In this study, we investigated the functional consequences of an increase in the expression of the type 3 isoform of the ryanodine receptor (RyR3). We found that although cortical neurons from TgCRND8 mice secreted significantly more amyloid beta protein and showed significantly increased RyR3 expression, they were no more sensitive to cell stress than non-transgenic neurons. Furthermore, despite increased intracellular Ca2+ release in response to ryanodine, we found that basal Ca2+, K+-evoked Ca2+ responses, and capacitative Ca2+ entry were no different in TgCRND8 neurons compared with non-transgenic neurons. Therefore, as RyR3 up-regulation did not affect neuronal health or global Ca2+ homeostasis, we investigated the effect of reducing RyR3 expression using small interfering RNA. Surprisingly, a reduction of RyR3 expression in TgCRND8, but not in non-transgenic, neurons increased neuronal death. These data reveal a new role for RyR3 and indicate a novel potential therapeutic target to delay or prevent the progression of Alzheimer's disease.
KW - Alzheimer's disease
KW - Endoplasmic reticulum
KW - Intracellular calcium
KW - Neuroprotection
KW - Ryanodine receptor
KW - TgCRND8
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U2 - 10.1111/j.1471-4159.2009.06487.x
DO - 10.1111/j.1471-4159.2009.06487.x
M3 - Article
C2 - 19903243
AN - SCOPUS:72849117720
SN - 0022-3042
VL - 112
SP - 356
EP - 365
JO - Journal of Neurochemistry
JF - Journal of Neurochemistry
IS - 2
ER -