Aggresomes protect cells by enhancing the degradation of toxic polyglutamine-containing protein.

Abstract:

:Expression of misfolded protein in cultured cells frequently leads to the formation of juxtanuclear inclusions that have been termed 'aggresomes'. Aggresome formation is an active cellular response that involves trafficking of the offending protein along microtubules, reorganization of intermediate filaments and recruitment of components of the ubiquitin proteasome system. Whether aggresomes are benevolent or noxious is unknown, but they are of particular interest because of the appearance of similar inclusions in protein deposition diseases. Here we present evidence that aggresomes serve a cytoprotective function and are associated with accelerated turnover of mutant proteins. We show that mutant androgen receptor (AR), the protein responsible for X-linked spinobulbar muscular atrophy, forms insoluble aggregates and is toxic to cultured cells. Mutant AR was also found to form aggresomes in a process distinct from aggregation. Molecular and pharmacological interventions were used to disrupt aggresome formation, revealing their cytoprotective function. Aggresome-forming proteins were found to have an accelerated rate of turnover, and this turnover was slowed by inhibition of aggresome formation. Finally, we show that aggresome-forming proteins become membrane-bound and associate with lysosomal structures. Together, these findings suggest that aggresomes are cytoprotective, serving as cytoplasmic recruitment centers to facilitate degradation of toxic proteins.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Taylor JP,Tanaka F,Robitschek J,Sandoval CM,Taye A,Markovic-Plese S,Fischbeck KH

doi

10.1093/hmg/ddg074

subject

Has Abstract

pub_date

2003-04-01 00:00:00

pages

749-57

issue

7

eissn

0964-6906

issn

1460-2083

journal_volume

12

pub_type

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