Niclosamide prevents the formation of large ubiquitin-containing aggregates caused by proteasome inhibition.
Protein aggregation is a hallmark of many neurodegenerative diseases and has been linked to the failure to degrade misfolded and damaged proteins. In the cell, aberrant proteins are degraded by the ubiquitin proteasome system that mainly targets short-lived proteins, or by the lysosomes that mostly...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2010-12-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3009716?pdf=render |
| _version_ | 1818138057194340352 |
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| author | Esther Gies Inga Wilde Jason M Winget Maria Brack Barak Rotblat Carolina Arias Novoa Aruna D Balgi Poul H Sorensen Michel Roberge Thibault Mayor |
| author_facet | Esther Gies Inga Wilde Jason M Winget Maria Brack Barak Rotblat Carolina Arias Novoa Aruna D Balgi Poul H Sorensen Michel Roberge Thibault Mayor |
| author_sort | Esther Gies |
| collection | DOAJ |
| description | Protein aggregation is a hallmark of many neurodegenerative diseases and has been linked to the failure to degrade misfolded and damaged proteins. In the cell, aberrant proteins are degraded by the ubiquitin proteasome system that mainly targets short-lived proteins, or by the lysosomes that mostly clear long-lived and poorly soluble proteins. Both systems are interconnected and, in some instances, autophagy can redirect proteasome substrates to the lysosomes.To better understand the interplay between these two systems, we established a neuroblastoma cell population stably expressing the GFP-ubiquitin fusion protein. We show that inhibition of the proteasome leads to the formation of large ubiquitin-containing inclusions accompanied by lower solubility of the ubiquitin conjugates. Strikingly, the formation of the ubiquitin-containing aggregates does not require ectopic expression of disease-specific proteins. Moreover, formation of these focused inclusions caused by proteasome inhibition requires the lysine 63 (K63) of ubiquitin. We then assessed selected compounds that stimulate autophagy and found that the antihelmintic chemical niclosamide prevents large aggregate formation induced by proteasome inhibition, while the prototypical mTORC1 inhibitor rapamycin had no apparent effect. Niclosamide also precludes the accumulation of poly-ubiquitinated proteins and of p62 upon proteasome inhibition. Moreover, niclosamide induces a change in lysosome distribution in the cell that, in the absence of proteasome activity, may favor the uptake into lysosomes of ubiquitinated proteins before they form large aggregates.Our results indicate that proteasome inhibition provokes the formation of large ubiquitin containing aggregates in tissue culture cells, even in the absence of disease specific proteins. Furthermore our study suggests that the autophagy-inducing compound niclosamide may promote the selective clearance of ubiquitinated proteins in the absence of proteasome activity. |
| first_indexed | 2024-12-11T10:06:08Z |
| format | Article |
| id | doaj.art-8e454627f8be412ea9dfa3b3fc94675f |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-11T10:06:08Z |
| publishDate | 2010-12-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-8e454627f8be412ea9dfa3b3fc94675f2022-12-22T01:11:56ZengPublic Library of Science (PLoS)PLoS ONE1932-62032010-12-01512e1441010.1371/journal.pone.0014410Niclosamide prevents the formation of large ubiquitin-containing aggregates caused by proteasome inhibition.Esther GiesInga WildeJason M WingetMaria BrackBarak RotblatCarolina Arias NovoaAruna D BalgiPoul H SorensenMichel RobergeThibault MayorProtein aggregation is a hallmark of many neurodegenerative diseases and has been linked to the failure to degrade misfolded and damaged proteins. In the cell, aberrant proteins are degraded by the ubiquitin proteasome system that mainly targets short-lived proteins, or by the lysosomes that mostly clear long-lived and poorly soluble proteins. Both systems are interconnected and, in some instances, autophagy can redirect proteasome substrates to the lysosomes.To better understand the interplay between these two systems, we established a neuroblastoma cell population stably expressing the GFP-ubiquitin fusion protein. We show that inhibition of the proteasome leads to the formation of large ubiquitin-containing inclusions accompanied by lower solubility of the ubiquitin conjugates. Strikingly, the formation of the ubiquitin-containing aggregates does not require ectopic expression of disease-specific proteins. Moreover, formation of these focused inclusions caused by proteasome inhibition requires the lysine 63 (K63) of ubiquitin. We then assessed selected compounds that stimulate autophagy and found that the antihelmintic chemical niclosamide prevents large aggregate formation induced by proteasome inhibition, while the prototypical mTORC1 inhibitor rapamycin had no apparent effect. Niclosamide also precludes the accumulation of poly-ubiquitinated proteins and of p62 upon proteasome inhibition. Moreover, niclosamide induces a change in lysosome distribution in the cell that, in the absence of proteasome activity, may favor the uptake into lysosomes of ubiquitinated proteins before they form large aggregates.Our results indicate that proteasome inhibition provokes the formation of large ubiquitin containing aggregates in tissue culture cells, even in the absence of disease specific proteins. Furthermore our study suggests that the autophagy-inducing compound niclosamide may promote the selective clearance of ubiquitinated proteins in the absence of proteasome activity.http://europepmc.org/articles/PMC3009716?pdf=render |
| spellingShingle | Esther Gies Inga Wilde Jason M Winget Maria Brack Barak Rotblat Carolina Arias Novoa Aruna D Balgi Poul H Sorensen Michel Roberge Thibault Mayor Niclosamide prevents the formation of large ubiquitin-containing aggregates caused by proteasome inhibition. PLoS ONE |
| title | Niclosamide prevents the formation of large ubiquitin-containing aggregates caused by proteasome inhibition. |
| title_full | Niclosamide prevents the formation of large ubiquitin-containing aggregates caused by proteasome inhibition. |
| title_fullStr | Niclosamide prevents the formation of large ubiquitin-containing aggregates caused by proteasome inhibition. |
| title_full_unstemmed | Niclosamide prevents the formation of large ubiquitin-containing aggregates caused by proteasome inhibition. |
| title_short | Niclosamide prevents the formation of large ubiquitin-containing aggregates caused by proteasome inhibition. |
| title_sort | niclosamide prevents the formation of large ubiquitin containing aggregates caused by proteasome inhibition |
| url | http://europepmc.org/articles/PMC3009716?pdf=render |
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