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Seeding of protein aggregation causes cognitive impairment in rat model of cortical synucleinopathy

Espa, Elena LU ; Clemensson, Erik K.H. LU ; Luk, Kelvin C.; Heuer, Andreas LU ; Björklund, Tomas LU and Cenci, M. Angela LU (2019) In Movement Disorders
Abstract

Background: Cortical α-synuclein pathology plays a role in the development of cognitive dysfunction in both Parkinson's disease and dementia with Lewy bodies, although the causative cellular lesions have remained unclear. We aimed to address causal links between α-synuclein-driven pathology in the cerebral cortex and the development of cognitive impairments using new experimental models. Methods: Neuronal overexpression of human α-synuclein was induced in the rat medial prefrontal cortex using viral vectors. This was combined with inoculations of preformed fibrils of human α-synuclein in some animals. Rats were evaluated with tests probing prefrontal cognitive functions (delayed matching/nonmatching to position and 5-choice serial... (More)

Background: Cortical α-synuclein pathology plays a role in the development of cognitive dysfunction in both Parkinson's disease and dementia with Lewy bodies, although the causative cellular lesions have remained unclear. We aimed to address causal links between α-synuclein-driven pathology in the cerebral cortex and the development of cognitive impairments using new experimental models. Methods: Neuronal overexpression of human α-synuclein was induced in the rat medial prefrontal cortex using viral vectors. This was combined with inoculations of preformed fibrils of human α-synuclein in some animals. Rats were evaluated with tests probing prefrontal cognitive functions (delayed matching/nonmatching to position and 5-choice serial reaction time task). Patterns of neuropathology were characterized immunohistochemically. Results: Neither α-synuclein overexpression nor the fibril seeds alone yielded any behavioral phenotype. In contrast, combining the 2 approaches produced significant impairments in working memory, attention, and inhibitory control. All animals injected with α-synuclein vectors exhibited high immunoreactivity for human α-synuclein in the medial prefrontal cortex and its primary projection targets. However, only when this overexpression was combined with fibril inoculations did animals exhibit large, proteinase K-resistant and Ser129-phosphorylated α-synuclein intraneuronal inclusions in the medial prefrontal cortex and its closely interconnected brain regions. The inclusions were associated with distorted dendritic morphologies and partial neuronal loss in the targeted cortical areas. Conclusions: Cortical overexpression of human α-synuclein is not sufficient to produce cognitive dysfunction, whereas combining this overexpression with fibril seeds yields both cognitive and histopathological phenotypes that are relevant to human Lewy body disease.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
dopamine neurons, genetic models, nonmotor symptoms, prion-like propagation
in
Movement Disorders
publisher
John Wiley & Sons
external identifiers
  • scopus:85071099228
ISSN
0885-3185
DOI
10.1002/mds.27810
language
English
LU publication?
yes
id
6ce09c17-0438-4320-a5b3-0567c31e25c8
date added to LUP
2019-09-04 09:19:34
date last changed
2019-09-26 04:41:22
@article{6ce09c17-0438-4320-a5b3-0567c31e25c8,
  abstract     = {<p>Background: Cortical α-synuclein pathology plays a role in the development of cognitive dysfunction in both Parkinson's disease and dementia with Lewy bodies, although the causative cellular lesions have remained unclear. We aimed to address causal links between α-synuclein-driven pathology in the cerebral cortex and the development of cognitive impairments using new experimental models. Methods: Neuronal overexpression of human α-synuclein was induced in the rat medial prefrontal cortex using viral vectors. This was combined with inoculations of preformed fibrils of human α-synuclein in some animals. Rats were evaluated with tests probing prefrontal cognitive functions (delayed matching/nonmatching to position and 5-choice serial reaction time task). Patterns of neuropathology were characterized immunohistochemically. Results: Neither α-synuclein overexpression nor the fibril seeds alone yielded any behavioral phenotype. In contrast, combining the 2 approaches produced significant impairments in working memory, attention, and inhibitory control. All animals injected with α-synuclein vectors exhibited high immunoreactivity for human α-synuclein in the medial prefrontal cortex and its primary projection targets. However, only when this overexpression was combined with fibril inoculations did animals exhibit large, proteinase K-resistant and Ser<sup>129</sup>-phosphorylated α-synuclein intraneuronal inclusions in the medial prefrontal cortex and its closely interconnected brain regions. The inclusions were associated with distorted dendritic morphologies and partial neuronal loss in the targeted cortical areas. Conclusions: Cortical overexpression of human α-synuclein is not sufficient to produce cognitive dysfunction, whereas combining this overexpression with fibril seeds yields both cognitive and histopathological phenotypes that are relevant to human Lewy body disease.</p>},
  author       = {Espa, Elena and Clemensson, Erik K.H. and Luk, Kelvin C. and Heuer, Andreas and Björklund, Tomas and Cenci, M. Angela},
  issn         = {0885-3185},
  keyword      = {dopamine neurons,genetic models,nonmotor symptoms,prion-like propagation},
  language     = {eng},
  month        = {08},
  publisher    = {John Wiley & Sons},
  series       = {Movement Disorders},
  title        = {Seeding of protein aggregation causes cognitive impairment in rat model of cortical synucleinopathy},
  url          = {http://dx.doi.org/10.1002/mds.27810},
  year         = {2019},
}