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- W2798145931 abstract "Mutations in SIL1, a co-factor for the endoplasmic reticular (ER) chaperone BiP, cause Marinesco-Sjögren syndrome (MSS), an autosomal recessive disorder. Using a mouse model, we characterized molecular aspects of the progressive myopathy associated with MSS. Proteomic-profiling of quadriceps at the onset of myopathy revealed that SIL1 deficiency affected multiple pathways critical to muscle physiology. We observed an increase in ER chaperones prior to the onset of muscle weakness, which was complemented by up-regulation of multiple components of cellular protein degradation pathways. These responses were inadequate to maintain normal expression of secretory pathway proteins, including Insulin and IGF-1 receptors. There was a paradoxical enhancement of downstream PI3K-AKT signaling and glucose uptake in SIL1-disrupted skeletal muscles, all of which were insufficient to maintain skeletal muscle mass. Together, these data reveal a disruption in ER homeostasis upon SIL1 loss, which is countered by multiple compensatory responses that are ultimately unsuccessful, leading to trans-organellar proteostasis collapse and myopathy." @default.
- W2798145931 created "2018-04-24" @default.
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- W2798145931 date "2018-01-01" @default.
- W2798145931 modified "2023-10-16" @default.
- W2798145931 title "SIL1, the ER Hsp70 co-chaperone, plays a critical role in maintaining skeletal muscle proteostasis and physiology" @default.
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- W2798145931 doi "https://doi.org/10.1242/dmm.033043" @default.
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