期刊
AGING-US
卷 7, 期 9, 页码 673-689出版社
IMPACT JOURNALS LLC
DOI: 10.18632/aging.100805
关键词
microglia; Caspace-8; Parkinson's disease; lipopolysaccharide; MPTP
资金
- Michael J Fox Foundation for Parkinson's Research
- Parkinson Foundation in Sweden
- Swedish Brain Foundation
- Swedish Research Council
- Spanish Ministerio de Economia y Competitividad [SAF2012-39029]
- Junta of Andalucia [P10-CTS-6494]
Increasing evidence involves sustained pro-inflammatory microglia activation in the pathogenesis of different neurodegenerative diseases, particularly Parkinson's disease (PD). We recently uncovered a completely novel and unexpected role for caspase-8 and its downstream substrates caspase-3/7 in the control of microglia activation and associated neurotoxicity to dopaminergic cells. To demonstrate the genetic evidence, mice bearing a floxed allele of CASP8 were crossed onto a transgenic line expressing Cre under the control of Lysozyme 2 gene. Analysis of caspase-8 gene deletion in brain microglia demonstrated a high efficiency in activated but not in resident microglia. Mice were challenged with lipopolysaccharide, a potent inducer of microglia activation, or with MPTP, which promotes specific dopaminergic cell damage and consequent reactive microgliosis. In neither of these models, CASP8 deletion appeared to affect the overall number of microglia expressing the pan specific microglia marker, Iba1. In contrast, CD16/CD32 expression, a microglial pro-inflammatory marker, was found to be negatively affected upon CASP8 deletion. Expression of additional proinflammatory markers were also found to be reduced in response to lipopolysaccharide. Of importance, reduced proinflammatory microglia activation was accompanied by a significant protection of the nigro-striatal dopaminergic system in the MPTP mouse model of PD.
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