Ubiquitin, cellular inclusions and their role in neurodegeneration - PubMed (original) (raw)
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Ubiquitin, cellular inclusions and their role in neurodegeneration
A Alves-Rodrigues et al. Trends Neurosci. 1998 Dec.
Abstract
Covalent binding of ubiquitin to proteins marks them for degradation by the ubiquitin/ATP-dependent pathway. This pathway plays a major role in the breakdown of abnormal proteins that result from oxidative stress, neurotoxicity and mutations. Failure to eliminate ubiquitinated proteins disrupts cellular homeostasis, causing degeneration. Inclusions containing ubiquitinated proteins are commonly detected in many neurological disorders. These aggregates are mostly cytosolic; nevertheless, ubiquitinated inclusions are found in endosomes/lysosomes in Alzheimer's disease and prion encephalopathies, and in nuclei in disorders associated with CAG/polyglutamine repeats, such as Huntington's disease and spinocerebellar ataxias. Ubiquitinated aggregates must result from a malfunction or overload of the ubiquitin/ATP-dependent pathway or from structural changes in the protein substrates, halting their degradation. Prevention of protein aggregation in these diseases might offer new therapeutic leads.
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