Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/43006
Título: A53T-alpha-synuclein overexpression impairs dopamine signaling and striatal synaptic plasticity in old mice
Autores/as: Kurz, Alexander
Double, Kay L.
Lastres-Becker, Isabel
Tozzi, Alessandro
Tantucci, Michela
Bockhart, Vanessa
Bonin, Michael
Garcia-Arencibia, Moises 
Nuber, Silke
Schlaudraff, Falk
Liss, Birgit
Fernández-Ruiz, Javier
Gerlach, Manfred
Wullner, Ullrich
Lüddens, Hartmut
Calabresi, Paolo
Auburger, Georg
Gispert, Suzana
Clasificación UNESCO: 320507 Neurología
Fecha de publicación: 2010
Publicación seriada: PLoS ONE 
Resumen: Background Parkinson's disease (PD), the second most frequent neurodegenerative disorder at old age, can be caused by elevated expression or the A53T missense mutation of the presynaptic protein alpha-synuclein (SNCA). PD is characterized pathologically by the preferential vulnerability of the dopaminergic nigrostriatal projection neurons. Methodology/Principal Findings Here, we used two mouse lines overexpressing human A53T-SNCA and studied striatal dysfunction in the absence of neurodegeneration to understand early disease mechanisms. To characterize the progression, we employed young adult as well as old mice. Analysis of striatal neurotransmitter content demonstrated that dopamine (DA) levels correlated directly with the level of expression of SNCA, an observation also made in SNCA-deficient (knockout, KO) mice. However, the elevated DA levels in the striatum of old A53T-SNCA overexpressing mice may not be transmitted appropriately, in view of three observations. First, a transcriptional downregulation of the extraneural DA degradation enzyme catechol-ortho-methytransferase (COMT) was found. Second, an upregulation of DA receptors was detected by immunoblots and autoradiography. Third, extensive transcriptome studies via microarrays and quantitative real-time RT-PCR (qPCR) of altered transcript levels of the DA-inducible genes Atf2, Cb1, Freq, Homer1 and Pde7b indicated a progressive and genotype-dependent reduction in the postsynaptic DA response. As a functional consequence, long term depression (LTD) was absent in corticostriatal slices from old transgenic mice. Conclusions/Significance Taken together, the dysfunctional neurotransmission and impaired synaptic plasticity seen in the A53T-SNCA overexpressing mice reflect early changes within the basal ganglia prior to frank neurodegeneration. As a model of preclinical stages of PD, such insights may help to develop neuroprotective therapeutic approaches.
URI: http://hdl.handle.net/10553/43006
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0011464
Fuente: Plos One [ISSN 1932-6203], v. 5 (7)
Colección:Artículos
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