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- Publisher
- Wiley
- Copyright
- Copyright © 2002 Wiley Subscription Services
- ISSN
- 0022-3042
- eISSN
- 1471-4159
- DOI
- 10.1046/j.1471-4159.2002.00978.x
- Publisher site
- See Article on Publisher Site
Abstract
Intracellular accumulation of damaged or abnormal proteins is a common event associated with numerous neurodegenerative diseases and other age‐related pathologies. Increasing the activity of the intracellular proteolytic systems normally responsible for the removal of these abnormal proteins might be beneficial in lessening the severity or development of those pathologies. In this study we have used human astrocyte glial cells to investigate the effect of vitamin C (ascorbate) on the intracellular turnover of proteins. Supplementation of the culture medium with physiological concentrations of vitamin C did not affect protein synthesis, but did increase the rate of protein degradation by lysosomes. Vitamin C accelerated the degradation of intra‐ and extracellular proteins targeted to the lysosomal lumen by autophagic and heterophagic pathways. At the doses analyzed, vitamin C lowered and stabilized the acidic intralysosomal pH at values that result in maximum activation of the lysosomal hydrolases.
Journal
Journal of Neurochemistry – Wiley
Published: Jan 1, 2002
Keywords: ; ; ; ; ;