Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió publicadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/141670
α-synuclein expression levels do not significantly affect proteasome function and expression in mice and stably transfected PC12 cell lines
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
α-Synuclein (α-syn) is a small protein of unknown function that is found aggregated in Lewy bodies, the histopathological hallmark of sporadic Parkinson disease and other synucleinopathies. Mutations in the α-syn gene and a triplication of its gene locus have been identified in early onset familial Parkinson disease. α-Syn turnover can be mediated by the proteasome pathway. A survey of published data may lead to the suggestion that overexpression of α-syn wild type, and/or their variants (A53T and A30P), may produce a decrease in proteasome activity and function, contributing to α-syn aggregation. To investigate the relationship between synuclein expression and proteasome function we have studied proteasome peptidase activities and proteasome subunit expression (α, β-constitutive, and inducible) in mice either lacking α-syn (knock-out mice) or transgenic for human α-syn A30P (under control of PrP promoter, at a time when no clear gliosis can be observed). Similar studies are presented in PC12 cells overexpressing enhanced yellow fluorescent protein fusion constructs of human wild type, A30P, and A53T α-syn. In these cell lines we have also analyzed the assembly of 20 S proteasome complex and the degradation rate of a well known substrate of the proteasome pathway, Iκbα. Overall the data obtained led us to the conclusion that α-synuclein expression levels by themselves have no significant effect on proteasome peptidase activity, subunit expression, and proteasome complex assembly and function. These results strengthen the suggestion that other mechanisms resulting in synuclein aggregation (not simply expression levels) may be the key to understand the possible effect of aggregated synuclein on proteasome function.
Matèries
Matèries (anglès)
Citació
Citació
MARTÍN-CLEMENTE, Begoña, ALVAREZ-CASTELAO, Beatriz, MAYO, Isabel, SIERRA, Ana belén, DÍAZ, Virginia, MILÁN, Miguel, FARIÑAS, Isabel, GÓMEZ ISLA, Teresa, FERRER, Isidro (ferrer abizanda), CASTAÑO, José g.. α-synuclein expression levels do not significantly affect proteasome function and expression in mice and stably transfected PC12 cell lines. _Journal of Biological Chemistry_. 2004. Vol. 291, núm. 51, pàgs. 52984-52990. [consulta: 25 de gener de 2026]. ISSN: 0021-9258. [Disponible a: https://hdl.handle.net/2445/141670]