Unknown

Dataset Information

0

Endoplasmic reticulum stress leads to accumulation of wild-type SOD1 aggregates associated with sporadic amyotrophic lateral sclerosis.


ABSTRACT: Abnormal modifications to mutant superoxide dismutase 1 (SOD1) are linked to familial amyotrophic lateral sclerosis (fALS). Misfolding of wild-type SOD1 (SOD1WT) is also observed in postmortem tissue of a subset of sporadic ALS (sALS) cases, but cellular and molecular mechanisms generating abnormal SOD1WT species are unknown. We analyzed aberrant human SOD1WT species over the lifetime of transgenic mice and found the accumulation of disulfide-cross-linked high-molecular-weight SOD1WT aggregates during aging. Subcellular fractionation of spinal cord tissue and protein overexpression in NSC-34 motoneuron-like cells revealed that endoplasmic reticulum (ER) localization favors oxidation and disulfide-dependent aggregation of SOD1WT We established a pharmacological paradigm of chronic ER stress in vivo, which recapitulated SOD1WTaggregation in young transgenic mice. These species were soluble in nondenaturing detergents and did not react with a SOD1 conformation-specific antibody. Interestingly, SOD1WT aggregation under ER stress correlated with astrocyte activation in the spinal cord of transgenic mice. Finally, the disulfide-cross-linked SOD1WT species were also found augmented in spinal cord tissue of sALS patients, correlating with the presence of ER stress markers. Overall, this study suggests that ER stress increases the susceptibility of SOD1WT to aggregate during aging, operating as a possible risk factor for developing ALS.

SUBMITTER: Medinas DB 

PROVIDER: S-EPMC6094144 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

altmetric image

Publications

Endoplasmic reticulum stress leads to accumulation of wild-type SOD1 aggregates associated with sporadic amyotrophic lateral sclerosis.

Medinas Danilo B DB   Rozas Pablo P   Martínez Traub Francisca F   Woehlbier Ute U   Brown Robert H RH   Bosco Daryl A DA   Hetz Claudio C  

Proceedings of the National Academy of Sciences of the United States of America 20180723 32


Abnormal modifications to mutant superoxide dismutase 1 (SOD1) are linked to familial amyotrophic lateral sclerosis (fALS). Misfolding of wild-type SOD1 (SOD1<sup>WT</sup>) is also observed in postmortem tissue of a subset of sporadic ALS (sALS) cases, but cellular and molecular mechanisms generating abnormal SOD1<sup>WT</sup> species are unknown. We analyzed aberrant human SOD1<sup>WT</sup> species over the lifetime of transgenic mice and found the accumulation of disulfide-cross-linked high-mo  ...[more]

Similar Datasets

| S-EPMC6155098 | biostudies-literature
| S-EPMC4435075 | biostudies-literature
| S-EPMC1941502 | biostudies-literature
| S-EPMC5939103 | biostudies-literature
| S-EPMC3796534 | biostudies-literature
| S-EPMC10883496 | biostudies-literature
2005-12-31 | GSE2400 | GEO
| S-EPMC9974850 | biostudies-literature
2010-06-05 | E-GEOD-2400 | biostudies-arrayexpress
| S-EPMC4376270 | biostudies-literature