Spinal cord endoplasmic reticulum stress associated with a microsomal accumulation of mutant superoxide dismutase-1 in an ALS model.
Mutation in superoxide dismutase-1 (SOD1), which is a cause of ALS, alters the folding patterns of this protein. Accumulation of misfolded mutant SOD1 might activate endoplasmic reticulum (ER) stress pathways. Here we show that transgenic mice expressing ALS-linked SOD1 mutants exhibit molecular alterations indicative of a recruitment of ER's signaling machinery. We demonstrate by biochemical and morphological methods that mutant SOD1 accumulates inside the ER, where it forms insoluble high molecular weight species and interacts with the ER chaperone immunoglobulin-binding protein. These alterations are age- and region-specific, because they develop over the course of the disease and occur in the affected spinal cord but not in the nonaffected cerebellum in transgenic mutant SOD1 mice. Our results suggest a toxic mechanism for mutant SOD1 by which this ubiquitously expressed pathogenic protein could affect motor neuron survival and contribute to the selective motor neuronal degeneration in ALS.
Kikuchi
Hitoshi
H
Department of Neurology, Columbia University, New York, NY 10032, USA.
Almer
Gabriele
G
Yamashita
Satoshi
S
Guégan
Christelle
C
Nagai
Makiko
M
Xu
Zuoshang
Z
Sosunov
Alexander A
AA
McKhann
Guy M
GM
Przedborski
Serge
S
D000818:Animals; D017209:Apoptosis; D053454:Caspase 12; D020169:Caspases / Q000378:metabolism; D004721:Endoplasmic Reticulum / Q000473:pathology / Q000502:physiology*; D051379:Mice; D008822:Mice, Transgenic; D008861:Microsomes / Q000201:enzymology*; D016472:Motor Neuron Disease / Q000235:genetics*; D009154:Mutation; D020641:Polymorphism, Single Nucleotide; D015398:Signal Transduction; D013116:Spinal Cord / Q000473:pathology / Q000503:physiopathology*; D013482:Superoxide Dismutase / Q000235:genetics* / Q000378:metabolism; D000072105:Superoxide Dismutase-1
C000606291:Sod1 protein, mouse; D013482:Superoxide Dismutase; D000072105:Superoxide Dismutase-1; C506440:Casp12 protein, mouse; D053454:Caspase 12; D020169:Caspases