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Long-term polarization of microglia upon α-synuclein overexpression in nonhuman primates

Barkholt, P.; Sanchez-Guajardo, V.; Kirik, Deniz LU and Romero-Ramos, M. (2012) In Neuroscience 208. p.85-96
Abstract
We have previously shown that persistent a-synuclein overexpression in ventral midbrain of marmoset leads to a distinctive neurodegenerative process and motor defects. The neurodegeneration was confined to caudate putamen dopaminergic fibers in animals overexpressing wild-type (wt) alpha-synuclein. However, A53T alpha-synuclein overexpression induced neurodegeneration that resulted in nigral dopaminergic cell death. Here, we analyze the microglia population in the midbrain of these animals by stereological quantification of lba1 + cells. Our data here show that monkeys overexpressing A53T alpha-synuclein showed a long-term increase in microglia presenting macrophagic morphology. However, wt alpha-synuclein overexpression, despite the... (More)
We have previously shown that persistent a-synuclein overexpression in ventral midbrain of marmoset leads to a distinctive neurodegenerative process and motor defects. The neurodegeneration was confined to caudate putamen dopaminergic fibers in animals overexpressing wild-type (wt) alpha-synuclein. However, A53T alpha-synuclein overexpression induced neurodegeneration that resulted in nigral dopaminergic cell death. Here, we analyze the microglia population in the midbrain of these animals by stereological quantification of lba1 + cells. Our data here show that monkeys overexpressing A53T alpha-synuclein showed a long-term increase in microglia presenting macrophagic morphology. However, wt alpha-synuclein overexpression, despite the absence of dopaminergic cell death, resulted in a permanent robust increase of the microglia population characterized by a range of distinct morphological types that persisted after 1 year. These results confirm that the microglial response differs depending on the type of alpha-synuclein (wt/A53T) and/or whether alpha-synuclein expression results in cell death or not, suggesting that microglia may play different roles during disease progression. Furthermore, the microglial response is modulated by events related to alpha-synuclein expression in substantia nigra and persists in the long term. The data presented here is in agreement with that previously observed in a recombinant adeno-associated virus (rAAV) alpha-synuclein rat model, thereby validating both the findings and the model, and highlighting the translational potential of the rodent model to higher species closer to humans. (C) 2012 IBRO. Published by Elsevier Ltd. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Parkinson's disease, primate, microglia, alpha-synuclein, lba-1, neuroinflammation
in
Neuroscience
volume
208
pages
85 - 96
publisher
Elsevier
external identifiers
  • wos:000302830300009
  • scopus:84858621036
ISSN
1873-7544
DOI
10.1016/j.neuroscience.2012.02.004
language
English
LU publication?
yes
id
49998d42-970e-4fa3-a1d0-e2ce9e168a9d (old id 2571022)
date added to LUP
2012-06-01 08:52:55
date last changed
2017-10-22 03:05:27
@article{49998d42-970e-4fa3-a1d0-e2ce9e168a9d,
  abstract     = {We have previously shown that persistent a-synuclein overexpression in ventral midbrain of marmoset leads to a distinctive neurodegenerative process and motor defects. The neurodegeneration was confined to caudate putamen dopaminergic fibers in animals overexpressing wild-type (wt) alpha-synuclein. However, A53T alpha-synuclein overexpression induced neurodegeneration that resulted in nigral dopaminergic cell death. Here, we analyze the microglia population in the midbrain of these animals by stereological quantification of lba1 + cells. Our data here show that monkeys overexpressing A53T alpha-synuclein showed a long-term increase in microglia presenting macrophagic morphology. However, wt alpha-synuclein overexpression, despite the absence of dopaminergic cell death, resulted in a permanent robust increase of the microglia population characterized by a range of distinct morphological types that persisted after 1 year. These results confirm that the microglial response differs depending on the type of alpha-synuclein (wt/A53T) and/or whether alpha-synuclein expression results in cell death or not, suggesting that microglia may play different roles during disease progression. Furthermore, the microglial response is modulated by events related to alpha-synuclein expression in substantia nigra and persists in the long term. The data presented here is in agreement with that previously observed in a recombinant adeno-associated virus (rAAV) alpha-synuclein rat model, thereby validating both the findings and the model, and highlighting the translational potential of the rodent model to higher species closer to humans. (C) 2012 IBRO. Published by Elsevier Ltd. All rights reserved.},
  author       = {Barkholt, P. and Sanchez-Guajardo, V. and Kirik, Deniz and Romero-Ramos, M.},
  issn         = {1873-7544},
  keyword      = {Parkinson's disease,primate,microglia,alpha-synuclein,lba-1,neuroinflammation},
  language     = {eng},
  pages        = {85--96},
  publisher    = {Elsevier},
  series       = {Neuroscience},
  title        = {Long-term polarization of microglia upon α-synuclein overexpression in nonhuman primates},
  url          = {http://dx.doi.org/10.1016/j.neuroscience.2012.02.004},
  volume       = {208},
  year         = {2012},
}