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Rpt2 proteasome subunit reduction causes Parkinson's disease like symptoms in Drosophila

The dysfunction of the proteasome-ubiquitin system is commonly reported in several neurodegenerative diseases. Post mortem samples of brains of patients with Parkinson´s disease present cytoplasmic inclusions that are rich in proteins such as ubiquitin, Tau, and α-synuclein. In Parkinson´s disease,...

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Autores principales: Fernández-Cruz, Iván, Sánchez-Díaz, Iván, Narváez-Padilla, Verónica, Reynaud, Enrique
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7369354/
https://www.ncbi.nlm.nih.gov/pubmed/32715147
http://dx.doi.org/10.1016/j.ibror.2020.07.001
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author Fernández-Cruz, Iván
Sánchez-Díaz, Iván
Narváez-Padilla, Verónica
Reynaud, Enrique
author_facet Fernández-Cruz, Iván
Sánchez-Díaz, Iván
Narváez-Padilla, Verónica
Reynaud, Enrique
author_sort Fernández-Cruz, Iván
collection PubMed
description The dysfunction of the proteasome-ubiquitin system is commonly reported in several neurodegenerative diseases. Post mortem samples of brains of patients with Parkinson´s disease present cytoplasmic inclusions that are rich in proteins such as ubiquitin, Tau, and α-synuclein. In Parkinson´s disease, a specific reduction of some of the proteasome subunits has also been reported. However, the specific role of the different proteasome subunits in dopaminergic neuron degeneration has not been thoroughly explored. In this work, we used the Gal4/UAS system to test fourteen Drosophila melanogaster RNAi lines from the Bloomington Drosophila Stock Center. Each of these lines targets a different proteasome subunit. To identify the strains that were able to induce neurodegeneration, we drove the expression of these lines to the eye and cataloged them as a function of the extent of neurodegeneration that they induced. The targeted proteasomal subunits are conserved in mammals and therefore may be relevant to study proteasome related diseases. The RNAi line among the regulatory subunits with the most penetrant phenotype targeted the proteasomal subunit Rpt2 and we decided to further characterize its phenotypes. Rpt2 knockdown in the Drosophila central nervous system reduced the activity of the proteasome, augmented the amount of insoluble ubiquitinated protein, and elicited motor and non-motor phenotypes that were similar to the ones found in Drosophila and other models for Parkinson’s disease. When Rpt2 is silenced pan-neurally, third instar larvae have locomotion dysfunctions and die during pupation. Larval lethality was avoided using the Gal80-Gal4 system to induce the expression of the Rpt2 RNAi to dopaminergic neurons only after pupation. The reduction of Rpt2 in adult dopaminergic neurons causes reduced survival, hyperactivity, neurodegeneration, and sleep loss; probably recapitulating some of the sleep disorders that Parkinson’s disease patients have before the appearance of locomotion disorders.
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spelling pubmed-73693542020-07-23 Rpt2 proteasome subunit reduction causes Parkinson's disease like symptoms in Drosophila Fernández-Cruz, Iván Sánchez-Díaz, Iván Narváez-Padilla, Verónica Reynaud, Enrique IBRO Rep Article The dysfunction of the proteasome-ubiquitin system is commonly reported in several neurodegenerative diseases. Post mortem samples of brains of patients with Parkinson´s disease present cytoplasmic inclusions that are rich in proteins such as ubiquitin, Tau, and α-synuclein. In Parkinson´s disease, a specific reduction of some of the proteasome subunits has also been reported. However, the specific role of the different proteasome subunits in dopaminergic neuron degeneration has not been thoroughly explored. In this work, we used the Gal4/UAS system to test fourteen Drosophila melanogaster RNAi lines from the Bloomington Drosophila Stock Center. Each of these lines targets a different proteasome subunit. To identify the strains that were able to induce neurodegeneration, we drove the expression of these lines to the eye and cataloged them as a function of the extent of neurodegeneration that they induced. The targeted proteasomal subunits are conserved in mammals and therefore may be relevant to study proteasome related diseases. The RNAi line among the regulatory subunits with the most penetrant phenotype targeted the proteasomal subunit Rpt2 and we decided to further characterize its phenotypes. Rpt2 knockdown in the Drosophila central nervous system reduced the activity of the proteasome, augmented the amount of insoluble ubiquitinated protein, and elicited motor and non-motor phenotypes that were similar to the ones found in Drosophila and other models for Parkinson’s disease. When Rpt2 is silenced pan-neurally, third instar larvae have locomotion dysfunctions and die during pupation. Larval lethality was avoided using the Gal80-Gal4 system to induce the expression of the Rpt2 RNAi to dopaminergic neurons only after pupation. The reduction of Rpt2 in adult dopaminergic neurons causes reduced survival, hyperactivity, neurodegeneration, and sleep loss; probably recapitulating some of the sleep disorders that Parkinson’s disease patients have before the appearance of locomotion disorders. Elsevier 2020-07-11 /pmc/articles/PMC7369354/ /pubmed/32715147 http://dx.doi.org/10.1016/j.ibror.2020.07.001 Text en © 2020 The Author(s) http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Article
Fernández-Cruz, Iván
Sánchez-Díaz, Iván
Narváez-Padilla, Verónica
Reynaud, Enrique
Rpt2 proteasome subunit reduction causes Parkinson's disease like symptoms in Drosophila
title Rpt2 proteasome subunit reduction causes Parkinson's disease like symptoms in Drosophila
title_full Rpt2 proteasome subunit reduction causes Parkinson's disease like symptoms in Drosophila
title_fullStr Rpt2 proteasome subunit reduction causes Parkinson's disease like symptoms in Drosophila
title_full_unstemmed Rpt2 proteasome subunit reduction causes Parkinson's disease like symptoms in Drosophila
title_short Rpt2 proteasome subunit reduction causes Parkinson's disease like symptoms in Drosophila
title_sort rpt2 proteasome subunit reduction causes parkinson's disease like symptoms in drosophila
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7369354/
https://www.ncbi.nlm.nih.gov/pubmed/32715147
http://dx.doi.org/10.1016/j.ibror.2020.07.001
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